Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 1 | /* drivers/serial/msm_serial_hs.c |
| 2 | * |
| 3 | * MSM 7k High speed uart driver |
| 4 | * |
| 5 | * Copyright (c) 2008 Google Inc. |
Mukesh Kumar Savaliya | 8fa1c82 | 2018-03-27 00:00:35 +0530 | [diff] [blame^] | 6 | * Copyright (c) 2007-2018, The Linux Foundation. All rights reserved. |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 7 | * Modified: Nick Pelly <npelly@google.com> |
| 8 | * |
| 9 | * All source code in this file is licensed under the following license |
| 10 | * except where indicated. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * version 2 as published by the Free Software Foundation. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 19 | * See the GNU General Public License for more details. |
| 20 | * |
| 21 | * Has optional support for uart power management independent of linux |
| 22 | * suspend/resume: |
| 23 | * |
| 24 | * RX wakeup. |
| 25 | * UART wakeup can be triggered by RX activity (using a wakeup GPIO on the |
| 26 | * UART RX pin). This should only be used if there is not a wakeup |
| 27 | * GPIO on the UART CTS, and the first RX byte is known (for example, with the |
| 28 | * Bluetooth Texas Instruments HCILL protocol), since the first RX byte will |
| 29 | * always be lost. RTS will be asserted even while the UART is off in this mode |
| 30 | * of operation. See msm_serial_hs_platform_data.rx_wakeup_irq. |
| 31 | */ |
| 32 | |
| 33 | #include <linux/module.h> |
| 34 | |
| 35 | #include <linux/serial.h> |
| 36 | #include <linux/serial_core.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/interrupt.h> |
| 40 | #include <linux/irq.h> |
| 41 | #include <linux/io.h> |
| 42 | #include <linux/ioport.h> |
| 43 | #include <linux/atomic.h> |
| 44 | #include <linux/kernel.h> |
| 45 | #include <linux/timer.h> |
| 46 | #include <linux/clk.h> |
| 47 | #include <linux/delay.h> |
| 48 | #include <linux/platform_device.h> |
| 49 | #include <linux/pm_runtime.h> |
| 50 | #include <linux/dma-mapping.h> |
| 51 | #include <linux/tty_flip.h> |
| 52 | #include <linux/wait.h> |
| 53 | #include <linux/sysfs.h> |
| 54 | #include <linux/stat.h> |
| 55 | #include <linux/device.h> |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 56 | #include <linux/debugfs.h> |
| 57 | #include <linux/of.h> |
| 58 | #include <linux/of_device.h> |
| 59 | #include <linux/of_gpio.h> |
| 60 | #include <linux/gpio.h> |
| 61 | #include <linux/ipc_logging.h> |
| 62 | #include <asm/irq.h> |
| 63 | #include <linux/kthread.h> |
| 64 | |
| 65 | #include <linux/msm-sps.h> |
| 66 | #include <linux/platform_data/msm_serial_hs.h> |
| 67 | #include <linux/msm-bus.h> |
| 68 | |
| 69 | #include "msm_serial_hs_hwreg.h" |
| 70 | #define UART_SPS_CONS_PERIPHERAL 0 |
| 71 | #define UART_SPS_PROD_PERIPHERAL 1 |
| 72 | |
| 73 | #define IPC_MSM_HS_LOG_STATE_PAGES 2 |
| 74 | #define IPC_MSM_HS_LOG_USER_PAGES 2 |
| 75 | #define IPC_MSM_HS_LOG_DATA_PAGES 3 |
| 76 | #define UART_DMA_DESC_NR 8 |
| 77 | #define BUF_DUMP_SIZE 32 |
| 78 | |
| 79 | /* If the debug_mask gets set to FATAL_LEV, |
| 80 | * a fatal error has happened and further IPC logging |
| 81 | * is disabled so that this problem can be detected |
| 82 | */ |
| 83 | enum { |
| 84 | FATAL_LEV = 0U, |
| 85 | ERR_LEV = 1U, |
| 86 | WARN_LEV = 2U, |
| 87 | INFO_LEV = 3U, |
| 88 | DBG_LEV = 4U, |
| 89 | }; |
| 90 | |
| 91 | #define MSM_HS_DBG(x...) do { \ |
| 92 | if (msm_uport->ipc_debug_mask >= DBG_LEV) { \ |
| 93 | if (msm_uport->ipc_msm_hs_log_ctxt) \ |
| 94 | ipc_log_string(msm_uport->ipc_msm_hs_log_ctxt, x); \ |
| 95 | } \ |
| 96 | } while (0) |
| 97 | |
| 98 | #define MSM_HS_INFO(x...) do { \ |
| 99 | if (msm_uport->ipc_debug_mask >= INFO_LEV) {\ |
| 100 | if (msm_uport->ipc_msm_hs_log_ctxt) \ |
| 101 | ipc_log_string(msm_uport->ipc_msm_hs_log_ctxt, x); \ |
| 102 | } \ |
| 103 | } while (0) |
| 104 | |
| 105 | /* warnings and errors show up on console always */ |
| 106 | #define MSM_HS_WARN(x...) do { \ |
| 107 | pr_warn(x); \ |
| 108 | if (msm_uport->ipc_msm_hs_log_ctxt && \ |
| 109 | msm_uport->ipc_debug_mask >= WARN_LEV) \ |
| 110 | ipc_log_string(msm_uport->ipc_msm_hs_log_ctxt, x); \ |
| 111 | } while (0) |
| 112 | |
| 113 | /* ERROR condition in the driver sets the hs_serial_debug_mask |
| 114 | * to ERR_FATAL level, so that this message can be seen |
| 115 | * in IPC logging. Further errors continue to log on the console |
| 116 | */ |
| 117 | #define MSM_HS_ERR(x...) do { \ |
| 118 | pr_err(x); \ |
| 119 | if (msm_uport->ipc_msm_hs_log_ctxt && \ |
| 120 | msm_uport->ipc_debug_mask >= ERR_LEV) { \ |
| 121 | ipc_log_string(msm_uport->ipc_msm_hs_log_ctxt, x); \ |
| 122 | msm_uport->ipc_debug_mask = FATAL_LEV; \ |
| 123 | } \ |
| 124 | } while (0) |
| 125 | |
| 126 | #define LOG_USR_MSG(ctx, x...) do { \ |
| 127 | if (ctx) \ |
| 128 | ipc_log_string(ctx, x); \ |
| 129 | } while (0) |
| 130 | |
| 131 | /* |
| 132 | * There are 3 different kind of UART Core available on MSM. |
| 133 | * High Speed UART (i.e. Legacy HSUART), GSBI based HSUART |
| 134 | * and BSLP based HSUART. |
| 135 | */ |
| 136 | enum uart_core_type { |
| 137 | LEGACY_HSUART, |
| 138 | GSBI_HSUART, |
| 139 | BLSP_HSUART, |
| 140 | }; |
| 141 | |
| 142 | enum flush_reason { |
| 143 | FLUSH_NONE, |
| 144 | FLUSH_DATA_READY, |
| 145 | FLUSH_DATA_INVALID, /* values after this indicate invalid data */ |
| 146 | FLUSH_IGNORE, |
| 147 | FLUSH_STOP, |
| 148 | FLUSH_SHUTDOWN, |
| 149 | }; |
| 150 | |
| 151 | /* |
| 152 | * SPS data structures to support HSUART with BAM |
| 153 | * @sps_pipe - This struct defines BAM pipe descriptor |
| 154 | * @sps_connect - This struct defines a connection's end point |
| 155 | * @sps_register - This struct defines a event registration parameters |
| 156 | */ |
| 157 | struct msm_hs_sps_ep_conn_data { |
| 158 | struct sps_pipe *pipe_handle; |
| 159 | struct sps_connect config; |
| 160 | struct sps_register_event event; |
| 161 | }; |
| 162 | |
| 163 | struct msm_hs_tx { |
| 164 | bool dma_in_flight; /* tx dma in progress */ |
| 165 | enum flush_reason flush; |
| 166 | wait_queue_head_t wait; |
| 167 | int tx_count; |
| 168 | dma_addr_t dma_base; |
| 169 | struct kthread_work kwork; |
| 170 | struct kthread_worker kworker; |
| 171 | struct task_struct *task; |
| 172 | struct msm_hs_sps_ep_conn_data cons; |
| 173 | struct timer_list tx_timeout_timer; |
| 174 | void *ipc_tx_ctxt; |
| 175 | }; |
| 176 | |
| 177 | struct msm_hs_rx { |
| 178 | enum flush_reason flush; |
| 179 | wait_queue_head_t wait; |
| 180 | dma_addr_t rbuffer; |
| 181 | unsigned char *buffer; |
| 182 | unsigned int buffer_pending; |
| 183 | struct delayed_work flip_insert_work; |
| 184 | struct kthread_work kwork; |
| 185 | struct kthread_worker kworker; |
| 186 | struct task_struct *task; |
| 187 | struct msm_hs_sps_ep_conn_data prod; |
| 188 | unsigned long queued_flag; |
| 189 | unsigned long pending_flag; |
| 190 | int rx_inx; |
| 191 | struct sps_iovec iovec[UART_DMA_DESC_NR]; /* track descriptors */ |
| 192 | void *ipc_rx_ctxt; |
| 193 | }; |
| 194 | enum buffer_states { |
| 195 | NONE_PENDING = 0x0, |
| 196 | FIFO_OVERRUN = 0x1, |
| 197 | PARITY_ERROR = 0x2, |
| 198 | CHARS_NORMAL = 0x4, |
| 199 | }; |
| 200 | |
| 201 | enum msm_hs_pm_state { |
| 202 | MSM_HS_PM_ACTIVE, |
| 203 | MSM_HS_PM_SUSPENDED, |
| 204 | MSM_HS_PM_SYS_SUSPENDED, |
| 205 | }; |
| 206 | |
| 207 | /* optional low power wakeup, typically on a GPIO RX irq */ |
| 208 | struct msm_hs_wakeup { |
| 209 | int irq; /* < 0 indicates low power wakeup disabled */ |
| 210 | unsigned char ignore; /* bool */ |
| 211 | |
| 212 | /* bool: inject char into rx tty on wakeup */ |
| 213 | bool inject_rx; |
| 214 | unsigned char rx_to_inject; |
| 215 | bool enabled; |
| 216 | bool freed; |
| 217 | }; |
| 218 | |
| 219 | struct msm_hs_port { |
| 220 | struct uart_port uport; |
| 221 | unsigned long imr_reg; /* shadow value of UARTDM_IMR */ |
| 222 | struct clk *clk; |
| 223 | struct clk *pclk; |
| 224 | struct msm_hs_tx tx; |
| 225 | struct msm_hs_rx rx; |
| 226 | atomic_t resource_count; |
| 227 | struct msm_hs_wakeup wakeup; |
| 228 | |
| 229 | struct dentry *loopback_dir; |
| 230 | struct work_struct clock_off_w; /* work for actual clock off */ |
| 231 | struct workqueue_struct *hsuart_wq; /* hsuart workqueue */ |
| 232 | struct mutex mtx; /* resource access mutex */ |
| 233 | enum uart_core_type uart_type; |
| 234 | unsigned long bam_handle; |
| 235 | resource_size_t bam_mem; |
| 236 | int bam_irq; |
| 237 | unsigned char __iomem *bam_base; |
| 238 | unsigned int bam_tx_ep_pipe_index; |
| 239 | unsigned int bam_rx_ep_pipe_index; |
| 240 | /* struct sps_event_notify is an argument passed when triggering a |
| 241 | * callback event object registered for an SPS connection end point. |
| 242 | */ |
| 243 | struct sps_event_notify notify; |
| 244 | /* bus client handler */ |
| 245 | u32 bus_perf_client; |
| 246 | /* BLSP UART required BUS Scaling data */ |
| 247 | struct msm_bus_scale_pdata *bus_scale_table; |
| 248 | bool rx_bam_inprogress; |
| 249 | wait_queue_head_t bam_disconnect_wait; |
| 250 | bool use_pinctrl; |
| 251 | struct pinctrl *pinctrl; |
| 252 | struct pinctrl_state *gpio_state_active; |
| 253 | struct pinctrl_state *gpio_state_suspend; |
| 254 | bool flow_control; |
| 255 | enum msm_hs_pm_state pm_state; |
| 256 | atomic_t client_count; |
| 257 | bool obs; /* out of band sleep flag */ |
| 258 | atomic_t client_req_state; |
| 259 | void *ipc_msm_hs_log_ctxt; |
| 260 | void *ipc_msm_hs_pwr_ctxt; |
| 261 | int ipc_debug_mask; |
| 262 | }; |
| 263 | |
| 264 | static const struct of_device_id msm_hs_match_table[] = { |
| 265 | { .compatible = "qcom,msm-hsuart-v14"}, |
| 266 | {} |
| 267 | }; |
| 268 | |
| 269 | |
| 270 | #define MSM_UARTDM_BURST_SIZE 16 /* DM burst size (in bytes) */ |
| 271 | #define UARTDM_TX_BUF_SIZE UART_XMIT_SIZE |
| 272 | #define UARTDM_RX_BUF_SIZE 512 |
| 273 | #define RETRY_TIMEOUT 5 |
| 274 | #define UARTDM_NR 256 |
| 275 | #define BAM_PIPE_MIN 0 |
| 276 | #define BAM_PIPE_MAX 11 |
| 277 | #define BUS_SCALING 1 |
| 278 | #define BUS_RESET 0 |
| 279 | #define RX_FLUSH_COMPLETE_TIMEOUT 300 /* In jiffies */ |
| 280 | #define BLSP_UART_CLK_FMAX 63160000 |
| 281 | |
| 282 | static struct dentry *debug_base; |
| 283 | static struct platform_driver msm_serial_hs_platform_driver; |
| 284 | static struct uart_driver msm_hs_driver; |
| 285 | static const struct uart_ops msm_hs_ops; |
| 286 | static void msm_hs_start_rx_locked(struct uart_port *uport); |
| 287 | static void msm_serial_hs_rx_work(struct kthread_work *work); |
| 288 | static void flip_insert_work(struct work_struct *work); |
| 289 | static void msm_hs_bus_voting(struct msm_hs_port *msm_uport, unsigned int vote); |
| 290 | static struct msm_hs_port *msm_hs_get_hs_port(int port_index); |
| 291 | static void msm_hs_queue_rx_desc(struct msm_hs_port *msm_uport); |
| 292 | static int disconnect_rx_endpoint(struct msm_hs_port *msm_uport); |
| 293 | static int msm_hs_pm_resume(struct device *dev); |
| 294 | |
| 295 | #define UARTDM_TO_MSM(uart_port) \ |
| 296 | container_of((uart_port), struct msm_hs_port, uport) |
| 297 | |
| 298 | static int msm_hs_ioctl(struct uart_port *uport, unsigned int cmd, |
| 299 | unsigned long arg) |
| 300 | { |
| 301 | int ret = 0, state = 1; |
| 302 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 303 | |
| 304 | if (!msm_uport) |
| 305 | return -ENODEV; |
| 306 | |
| 307 | switch (cmd) { |
| 308 | case MSM_ENABLE_UART_CLOCK: { |
| 309 | ret = msm_hs_request_clock_on(&msm_uport->uport); |
| 310 | break; |
| 311 | } |
| 312 | case MSM_DISABLE_UART_CLOCK: { |
| 313 | ret = msm_hs_request_clock_off(&msm_uport->uport); |
| 314 | break; |
| 315 | } |
| 316 | case MSM_GET_UART_CLOCK_STATUS: { |
| 317 | /* Return value 0 - UART CLOCK is OFF |
| 318 | * Return value 1 - UART CLOCK is ON |
| 319 | */ |
| 320 | |
| 321 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) |
| 322 | state = 0; |
| 323 | ret = state; |
| 324 | MSM_HS_INFO("%s():GET UART CLOCK STATUS: cmd=%d state=%d\n", |
| 325 | __func__, cmd, state); |
| 326 | break; |
| 327 | } |
| 328 | default: { |
| 329 | MSM_HS_INFO("%s():Unknown cmd specified: cmd=%d\n", __func__, |
| 330 | cmd); |
| 331 | ret = -ENOIOCTLCMD; |
| 332 | break; |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | return ret; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * This function is called initially during probe and then |
| 341 | * through the runtime PM framework. The function directly calls |
| 342 | * resource APIs to enable them. |
| 343 | */ |
| 344 | |
| 345 | static int msm_hs_clk_bus_vote(struct msm_hs_port *msm_uport) |
| 346 | { |
| 347 | int rc = 0; |
| 348 | |
| 349 | msm_hs_bus_voting(msm_uport, BUS_SCALING); |
| 350 | /* Turn on core clk and iface clk */ |
| 351 | if (msm_uport->pclk) { |
| 352 | rc = clk_prepare_enable(msm_uport->pclk); |
| 353 | if (rc) { |
| 354 | dev_err(msm_uport->uport.dev, |
| 355 | "%s: Could not turn on pclk [%d]\n", |
| 356 | __func__, rc); |
| 357 | goto busreset; |
| 358 | } |
| 359 | } |
| 360 | rc = clk_prepare_enable(msm_uport->clk); |
| 361 | if (rc) { |
| 362 | dev_err(msm_uport->uport.dev, |
| 363 | "%s: Could not turn on core clk [%d]\n", |
| 364 | __func__, rc); |
| 365 | goto core_unprepare; |
| 366 | } |
| 367 | MSM_HS_DBG("%s: Clock ON successful\n", __func__); |
| 368 | return rc; |
| 369 | core_unprepare: |
| 370 | clk_disable_unprepare(msm_uport->pclk); |
| 371 | busreset: |
| 372 | msm_hs_bus_voting(msm_uport, BUS_RESET); |
| 373 | return rc; |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * This function is called initially during probe and then |
| 378 | * through the runtime PM framework. The function directly calls |
| 379 | * resource apis to disable them. |
| 380 | */ |
| 381 | static void msm_hs_clk_bus_unvote(struct msm_hs_port *msm_uport) |
| 382 | { |
| 383 | clk_disable_unprepare(msm_uport->clk); |
| 384 | if (msm_uport->pclk) |
| 385 | clk_disable_unprepare(msm_uport->pclk); |
| 386 | msm_hs_bus_voting(msm_uport, BUS_RESET); |
| 387 | MSM_HS_DBG("%s: Clock OFF successful\n", __func__); |
| 388 | } |
| 389 | |
| 390 | /* Remove vote for resources when done */ |
| 391 | static void msm_hs_resource_unvote(struct msm_hs_port *msm_uport) |
| 392 | { |
| 393 | struct uart_port *uport = &(msm_uport->uport); |
| 394 | int rc = atomic_read(&msm_uport->resource_count); |
| 395 | |
| 396 | MSM_HS_DBG("%s(): power usage count %d", __func__, rc); |
| 397 | if (rc <= 0) { |
| 398 | MSM_HS_WARN("%s(): rc zero, bailing\n", __func__); |
| 399 | WARN_ON(1); |
| 400 | return; |
| 401 | } |
| 402 | atomic_dec(&msm_uport->resource_count); |
| 403 | pm_runtime_mark_last_busy(uport->dev); |
| 404 | pm_runtime_put_autosuspend(uport->dev); |
| 405 | } |
| 406 | |
| 407 | /* Vote for resources before accessing them */ |
| 408 | static void msm_hs_resource_vote(struct msm_hs_port *msm_uport) |
| 409 | { |
| 410 | int ret; |
| 411 | struct uart_port *uport = &(msm_uport->uport); |
| 412 | |
| 413 | ret = pm_runtime_get_sync(uport->dev); |
| 414 | if (ret < 0 || msm_uport->pm_state != MSM_HS_PM_ACTIVE) { |
| 415 | MSM_HS_WARN("%s:%s runtime callback not invoked ret:%d st:%d", |
| 416 | __func__, dev_name(uport->dev), ret, |
| 417 | msm_uport->pm_state); |
| 418 | msm_hs_pm_resume(uport->dev); |
| 419 | } |
| 420 | atomic_inc(&msm_uport->resource_count); |
| 421 | } |
| 422 | |
| 423 | /* Check if the uport line number matches with user id stored in pdata. |
| 424 | * User id information is stored during initialization. This function |
| 425 | * ensues that the same device is selected |
| 426 | */ |
| 427 | |
| 428 | static struct msm_hs_port *get_matching_hs_port(struct platform_device *pdev) |
| 429 | { |
| 430 | struct msm_serial_hs_platform_data *pdata = pdev->dev.platform_data; |
| 431 | struct msm_hs_port *msm_uport = msm_hs_get_hs_port(pdev->id); |
| 432 | |
| 433 | if ((!msm_uport) || (msm_uport->uport.line != pdev->id |
| 434 | && msm_uport->uport.line != pdata->userid)) { |
| 435 | pr_err("uport line number mismatch!"); |
| 436 | WARN_ON(1); |
| 437 | return NULL; |
| 438 | } |
| 439 | |
| 440 | return msm_uport; |
| 441 | } |
| 442 | |
| 443 | static ssize_t show_clock(struct device *dev, struct device_attribute *attr, |
| 444 | char *buf) |
| 445 | { |
| 446 | int state = 1; |
| 447 | ssize_t ret = 0; |
| 448 | struct platform_device *pdev = container_of(dev, struct |
| 449 | platform_device, dev); |
| 450 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 451 | |
| 452 | /* This check should not fail */ |
| 453 | if (msm_uport) { |
| 454 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) |
| 455 | state = 0; |
| 456 | ret = snprintf(buf, PAGE_SIZE, "%d\n", state); |
| 457 | } |
| 458 | return ret; |
| 459 | } |
| 460 | |
| 461 | static ssize_t set_clock(struct device *dev, struct device_attribute *attr, |
| 462 | const char *buf, size_t count) |
| 463 | { |
| 464 | int state; |
| 465 | ssize_t ret = 0; |
| 466 | struct platform_device *pdev = container_of(dev, struct |
| 467 | platform_device, dev); |
| 468 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 469 | |
| 470 | /* This check should not fail */ |
| 471 | if (msm_uport) { |
| 472 | state = buf[0] - '0'; |
| 473 | switch (state) { |
| 474 | case 0: |
| 475 | MSM_HS_DBG("%s: Request clock OFF\n", __func__); |
| 476 | msm_hs_request_clock_off(&msm_uport->uport); |
| 477 | ret = count; |
| 478 | break; |
| 479 | case 1: |
| 480 | MSM_HS_DBG("%s: Request clock ON\n", __func__); |
| 481 | msm_hs_request_clock_on(&msm_uport->uport); |
| 482 | ret = count; |
| 483 | break; |
| 484 | default: |
| 485 | ret = -EINVAL; |
| 486 | } |
| 487 | } |
| 488 | return ret; |
| 489 | } |
| 490 | |
| 491 | static DEVICE_ATTR(clock, 0644, show_clock, set_clock); |
| 492 | |
| 493 | static ssize_t show_debug_mask(struct device *dev, |
| 494 | struct device_attribute *attr, char *buf) |
| 495 | { |
| 496 | ssize_t ret = 0; |
| 497 | struct platform_device *pdev = container_of(dev, struct |
| 498 | platform_device, dev); |
| 499 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 500 | |
| 501 | /* This check should not fail */ |
| 502 | if (msm_uport) |
| 503 | ret = snprintf(buf, sizeof(int), "%u\n", |
| 504 | msm_uport->ipc_debug_mask); |
| 505 | return ret; |
| 506 | } |
| 507 | |
| 508 | static ssize_t set_debug_mask(struct device *dev, |
| 509 | struct device_attribute *attr, |
| 510 | const char *buf, size_t count) |
| 511 | { |
| 512 | struct platform_device *pdev = container_of(dev, struct |
| 513 | platform_device, dev); |
| 514 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 515 | |
| 516 | /* This check should not fail */ |
| 517 | if (msm_uport) { |
| 518 | msm_uport->ipc_debug_mask = buf[0] - '0'; |
| 519 | if (msm_uport->ipc_debug_mask < FATAL_LEV || |
| 520 | msm_uport->ipc_debug_mask > DBG_LEV) { |
| 521 | /* set to default level */ |
| 522 | msm_uport->ipc_debug_mask = INFO_LEV; |
| 523 | MSM_HS_ERR("Range is 0 to 4;Set to default level 3\n"); |
| 524 | return -EINVAL; |
| 525 | } |
| 526 | } |
| 527 | return count; |
| 528 | } |
| 529 | |
| 530 | static DEVICE_ATTR(debug_mask, 0644, show_debug_mask, |
| 531 | set_debug_mask); |
| 532 | |
| 533 | static inline bool is_use_low_power_wakeup(struct msm_hs_port *msm_uport) |
| 534 | { |
| 535 | return msm_uport->wakeup.irq > 0; |
| 536 | } |
| 537 | |
| 538 | static void msm_hs_bus_voting(struct msm_hs_port *msm_uport, unsigned int vote) |
| 539 | { |
| 540 | int ret; |
| 541 | |
| 542 | if (msm_uport->bus_perf_client) { |
| 543 | MSM_HS_DBG("Bus voting:%d\n", vote); |
| 544 | ret = msm_bus_scale_client_update_request( |
| 545 | msm_uport->bus_perf_client, vote); |
| 546 | if (ret) |
| 547 | MSM_HS_ERR("%s(): Failed for Bus voting: %d\n", |
| 548 | __func__, vote); |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | static inline unsigned int msm_hs_read(struct uart_port *uport, |
| 553 | unsigned int index) |
| 554 | { |
| 555 | return readl_relaxed(uport->membase + index); |
| 556 | } |
| 557 | |
| 558 | static inline void msm_hs_write(struct uart_port *uport, unsigned int index, |
| 559 | unsigned int value) |
| 560 | { |
| 561 | writel_relaxed(value, uport->membase + index); |
| 562 | } |
| 563 | |
| 564 | static int sps_rx_disconnect(struct sps_pipe *sps_pipe_handler) |
| 565 | { |
| 566 | struct sps_connect config; |
| 567 | int ret; |
| 568 | |
| 569 | ret = sps_get_config(sps_pipe_handler, &config); |
| 570 | if (ret) { |
| 571 | pr_err("%s: sps_get_config() failed ret %d\n", __func__, ret); |
| 572 | return ret; |
| 573 | } |
| 574 | config.options |= SPS_O_POLL; |
| 575 | ret = sps_set_config(sps_pipe_handler, &config); |
| 576 | if (ret) { |
| 577 | pr_err("%s: sps_set_config() failed ret %d\n", __func__, ret); |
| 578 | return ret; |
| 579 | } |
| 580 | return sps_disconnect(sps_pipe_handler); |
| 581 | } |
| 582 | |
| 583 | static void hex_dump_ipc(struct msm_hs_port *msm_uport, void *ipc_ctx, |
| 584 | char *prefix, char *string, u64 addr, int size) |
| 585 | |
| 586 | { |
| 587 | char buf[(BUF_DUMP_SIZE * 3) + 2]; |
| 588 | int len = 0; |
| 589 | |
| 590 | len = min(size, BUF_DUMP_SIZE); |
| 591 | /* |
| 592 | * Print upto 32 data bytes, 32 bytes per line, 1 byte at a time and |
| 593 | * don't include the ASCII text at the end of the buffer. |
| 594 | */ |
| 595 | hex_dump_to_buffer(string, len, 32, 1, buf, sizeof(buf), false); |
| 596 | ipc_log_string(ipc_ctx, "%s[0x%.10x:%d] : %s", prefix, |
| 597 | (unsigned int)addr, size, buf); |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * This API read and provides UART Core registers information. |
| 602 | */ |
| 603 | static void dump_uart_hs_registers(struct msm_hs_port *msm_uport) |
| 604 | { |
| 605 | struct uart_port *uport = &(msm_uport->uport); |
| 606 | |
| 607 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) { |
| 608 | MSM_HS_INFO("%s:Failed clocks are off, resource_count %d", |
| 609 | __func__, atomic_read(&msm_uport->resource_count)); |
| 610 | return; |
| 611 | } |
| 612 | |
| 613 | MSM_HS_DBG( |
| 614 | "MR1:%x MR2:%x TFWR:%x RFWR:%x DMEN:%x IMR:%x MISR:%x NCF_TX:%x\n", |
| 615 | msm_hs_read(uport, UART_DM_MR1), |
| 616 | msm_hs_read(uport, UART_DM_MR2), |
| 617 | msm_hs_read(uport, UART_DM_TFWR), |
| 618 | msm_hs_read(uport, UART_DM_RFWR), |
| 619 | msm_hs_read(uport, UART_DM_DMEN), |
| 620 | msm_hs_read(uport, UART_DM_IMR), |
| 621 | msm_hs_read(uport, UART_DM_MISR), |
| 622 | msm_hs_read(uport, UART_DM_NCF_TX)); |
| 623 | MSM_HS_INFO("SR:%x ISR:%x DMRX:%x RX_SNAP:%x TXFS:%x RXFS:%x\n", |
| 624 | msm_hs_read(uport, UART_DM_SR), |
| 625 | msm_hs_read(uport, UART_DM_ISR), |
| 626 | msm_hs_read(uport, UART_DM_DMRX), |
| 627 | msm_hs_read(uport, UART_DM_RX_TOTAL_SNAP), |
| 628 | msm_hs_read(uport, UART_DM_TXFS), |
| 629 | msm_hs_read(uport, UART_DM_RXFS)); |
| 630 | MSM_HS_DBG("rx.flush:%u\n", msm_uport->rx.flush); |
| 631 | } |
| 632 | |
| 633 | static int msm_serial_loopback_enable_set(void *data, u64 val) |
| 634 | { |
| 635 | struct msm_hs_port *msm_uport = data; |
| 636 | struct uart_port *uport = &(msm_uport->uport); |
| 637 | unsigned long flags; |
| 638 | int ret = 0; |
| 639 | |
| 640 | msm_hs_resource_vote(msm_uport); |
| 641 | |
| 642 | if (val) { |
| 643 | spin_lock_irqsave(&uport->lock, flags); |
| 644 | ret = msm_hs_read(uport, UART_DM_MR2); |
| 645 | ret |= (UARTDM_MR2_LOOP_MODE_BMSK | |
| 646 | UARTDM_MR2_RFR_CTS_LOOP_MODE_BMSK); |
| 647 | msm_hs_write(uport, UART_DM_MR2, ret); |
| 648 | spin_unlock_irqrestore(&uport->lock, flags); |
| 649 | } else { |
| 650 | spin_lock_irqsave(&uport->lock, flags); |
| 651 | ret = msm_hs_read(uport, UART_DM_MR2); |
| 652 | ret &= ~(UARTDM_MR2_LOOP_MODE_BMSK | |
| 653 | UARTDM_MR2_RFR_CTS_LOOP_MODE_BMSK); |
| 654 | msm_hs_write(uport, UART_DM_MR2, ret); |
| 655 | spin_unlock_irqrestore(&uport->lock, flags); |
| 656 | } |
| 657 | /* Calling CLOCK API. Hence mb() requires here. */ |
| 658 | mb(); |
| 659 | |
| 660 | msm_hs_resource_unvote(msm_uport); |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | static int msm_serial_loopback_enable_get(void *data, u64 *val) |
| 665 | { |
| 666 | struct msm_hs_port *msm_uport = data; |
| 667 | struct uart_port *uport = &(msm_uport->uport); |
| 668 | unsigned long flags; |
| 669 | int ret = 0; |
| 670 | |
| 671 | msm_hs_resource_vote(msm_uport); |
| 672 | |
| 673 | spin_lock_irqsave(&uport->lock, flags); |
| 674 | ret = msm_hs_read(&msm_uport->uport, UART_DM_MR2); |
| 675 | spin_unlock_irqrestore(&uport->lock, flags); |
| 676 | |
| 677 | msm_hs_resource_unvote(msm_uport); |
| 678 | |
| 679 | *val = (ret & UARTDM_MR2_LOOP_MODE_BMSK) ? 1 : 0; |
| 680 | |
| 681 | return 0; |
| 682 | } |
| 683 | DEFINE_SIMPLE_ATTRIBUTE(loopback_enable_fops, msm_serial_loopback_enable_get, |
| 684 | msm_serial_loopback_enable_set, "%llu\n"); |
| 685 | |
| 686 | /* |
| 687 | * msm_serial_hs debugfs node: <debugfs_root>/msm_serial_hs/loopback.<id> |
| 688 | * writing 1 turns on internal loopback mode in HW. Useful for automation |
| 689 | * test scripts. |
| 690 | * writing 0 disables the internal loopback mode. Default is disabled. |
| 691 | */ |
| 692 | static void msm_serial_debugfs_init(struct msm_hs_port *msm_uport, |
| 693 | int id) |
| 694 | { |
| 695 | char node_name[15]; |
| 696 | |
| 697 | snprintf(node_name, sizeof(node_name), "loopback.%d", id); |
| 698 | msm_uport->loopback_dir = debugfs_create_file(node_name, |
| 699 | 0644, |
| 700 | debug_base, |
| 701 | msm_uport, |
| 702 | &loopback_enable_fops); |
| 703 | |
| 704 | if (IS_ERR_OR_NULL(msm_uport->loopback_dir)) |
| 705 | MSM_HS_ERR("%s(): Cannot create loopback.%d debug entry", |
| 706 | __func__, id); |
| 707 | } |
| 708 | |
| 709 | static int msm_hs_remove(struct platform_device *pdev) |
| 710 | { |
| 711 | |
| 712 | struct msm_hs_port *msm_uport; |
| 713 | struct device *dev; |
| 714 | |
| 715 | if (pdev->id < 0 || pdev->id >= UARTDM_NR) { |
| 716 | pr_err("Invalid plaform device ID = %d\n", pdev->id); |
| 717 | return -EINVAL; |
| 718 | } |
| 719 | |
| 720 | msm_uport = get_matching_hs_port(pdev); |
| 721 | if (!msm_uport) |
| 722 | return -EINVAL; |
| 723 | |
| 724 | dev = msm_uport->uport.dev; |
| 725 | sysfs_remove_file(&pdev->dev.kobj, &dev_attr_clock.attr); |
| 726 | sysfs_remove_file(&pdev->dev.kobj, &dev_attr_debug_mask.attr); |
| 727 | debugfs_remove(msm_uport->loopback_dir); |
| 728 | |
| 729 | dma_free_coherent(msm_uport->uport.dev, |
| 730 | UART_DMA_DESC_NR * UARTDM_RX_BUF_SIZE, |
| 731 | msm_uport->rx.buffer, msm_uport->rx.rbuffer); |
| 732 | |
| 733 | msm_uport->rx.buffer = NULL; |
| 734 | msm_uport->rx.rbuffer = 0; |
| 735 | |
| 736 | destroy_workqueue(msm_uport->hsuart_wq); |
| 737 | mutex_destroy(&msm_uport->mtx); |
| 738 | |
| 739 | uart_remove_one_port(&msm_hs_driver, &msm_uport->uport); |
| 740 | clk_put(msm_uport->clk); |
| 741 | if (msm_uport->pclk) |
| 742 | clk_put(msm_uport->pclk); |
| 743 | |
| 744 | iounmap(msm_uport->uport.membase); |
| 745 | |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | |
| 750 | /* Connect a UART peripheral's SPS endpoint(consumer endpoint) |
| 751 | * |
| 752 | * Also registers a SPS callback function for the consumer |
| 753 | * process with the SPS driver |
| 754 | * |
| 755 | * @uport - Pointer to uart uport structure |
| 756 | * |
| 757 | * @return - 0 if successful else negative value. |
| 758 | * |
| 759 | */ |
| 760 | |
| 761 | static int msm_hs_spsconnect_tx(struct msm_hs_port *msm_uport) |
| 762 | { |
| 763 | int ret; |
| 764 | struct uart_port *uport = &msm_uport->uport; |
| 765 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 766 | struct sps_pipe *sps_pipe_handle = tx->cons.pipe_handle; |
| 767 | struct sps_connect *sps_config = &tx->cons.config; |
| 768 | struct sps_register_event *sps_event = &tx->cons.event; |
| 769 | unsigned long flags; |
| 770 | unsigned int data; |
| 771 | |
| 772 | if (tx->flush != FLUSH_SHUTDOWN) { |
| 773 | MSM_HS_ERR("%s:Invalid flush state:%d\n", __func__, tx->flush); |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | /* Establish connection between peripheral and memory endpoint */ |
| 778 | ret = sps_connect(sps_pipe_handle, sps_config); |
| 779 | if (ret) { |
| 780 | MSM_HS_ERR("msm_serial_hs: sps_connect() failed for tx!!\n" |
| 781 | "pipe_handle=0x%p ret=%d", sps_pipe_handle, ret); |
| 782 | return ret; |
| 783 | } |
| 784 | /* Register callback event for EOT (End of transfer) event. */ |
| 785 | ret = sps_register_event(sps_pipe_handle, sps_event); |
| 786 | if (ret) { |
| 787 | MSM_HS_ERR("msm_serial_hs: sps_connect() failed for tx!!\n" |
| 788 | "pipe_handle=0x%p ret=%d", sps_pipe_handle, ret); |
| 789 | goto reg_event_err; |
| 790 | } |
| 791 | |
| 792 | spin_lock_irqsave(&(msm_uport->uport.lock), flags); |
| 793 | msm_uport->tx.flush = FLUSH_STOP; |
| 794 | spin_unlock_irqrestore(&(msm_uport->uport.lock), flags); |
| 795 | |
| 796 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 797 | /* Enable UARTDM Tx BAM Interface */ |
| 798 | data |= UARTDM_TX_BAM_ENABLE_BMSK; |
| 799 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 800 | |
| 801 | msm_hs_write(uport, UART_DM_CR, RESET_TX); |
| 802 | msm_hs_write(uport, UART_DM_CR, START_TX_BAM_IFC); |
| 803 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_TX_EN_BMSK); |
| 804 | |
| 805 | MSM_HS_DBG("%s(): TX Connect", __func__); |
| 806 | return 0; |
| 807 | |
| 808 | reg_event_err: |
| 809 | sps_disconnect(sps_pipe_handle); |
| 810 | return ret; |
| 811 | } |
| 812 | |
| 813 | /* Connect a UART peripheral's SPS endpoint(producer endpoint) |
| 814 | * |
| 815 | * Also registers a SPS callback function for the producer |
| 816 | * process with the SPS driver |
| 817 | * |
| 818 | * @uport - Pointer to uart uport structure |
| 819 | * |
| 820 | * @return - 0 if successful else negative value. |
| 821 | * |
| 822 | */ |
| 823 | |
| 824 | static int msm_hs_spsconnect_rx(struct uart_port *uport) |
| 825 | { |
| 826 | int ret; |
| 827 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 828 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 829 | struct sps_pipe *sps_pipe_handle = rx->prod.pipe_handle; |
| 830 | struct sps_connect *sps_config = &rx->prod.config; |
| 831 | struct sps_register_event *sps_event = &rx->prod.event; |
| 832 | unsigned long flags; |
| 833 | |
| 834 | /* Establish connection between peripheral and memory endpoint */ |
| 835 | ret = sps_connect(sps_pipe_handle, sps_config); |
| 836 | if (ret) { |
| 837 | MSM_HS_ERR("msm_serial_hs: sps_connect() failed for rx!!\n" |
| 838 | "pipe_handle=0x%p ret=%d", sps_pipe_handle, ret); |
| 839 | return ret; |
| 840 | } |
| 841 | /* Register callback event for DESC_DONE event. */ |
| 842 | ret = sps_register_event(sps_pipe_handle, sps_event); |
| 843 | if (ret) { |
| 844 | MSM_HS_ERR("msm_serial_hs: sps_connect() failed for rx!!\n" |
| 845 | "pipe_handle=0x%p ret=%d", sps_pipe_handle, ret); |
| 846 | goto reg_event_err; |
| 847 | } |
| 848 | spin_lock_irqsave(&uport->lock, flags); |
| 849 | if (msm_uport->rx.pending_flag) |
| 850 | MSM_HS_WARN("%s(): Buffers may be pending 0x%lx", |
| 851 | __func__, msm_uport->rx.pending_flag); |
| 852 | msm_uport->rx.queued_flag = 0; |
| 853 | msm_uport->rx.pending_flag = 0; |
| 854 | msm_uport->rx.rx_inx = 0; |
| 855 | msm_uport->rx.flush = FLUSH_STOP; |
| 856 | spin_unlock_irqrestore(&uport->lock, flags); |
| 857 | MSM_HS_DBG("%s(): RX Connect\n", __func__); |
| 858 | return 0; |
| 859 | |
| 860 | reg_event_err: |
| 861 | sps_disconnect(sps_pipe_handle); |
| 862 | return ret; |
| 863 | } |
| 864 | |
| 865 | /* |
| 866 | * programs the UARTDM_CSR register with correct bit rates |
| 867 | * |
| 868 | * Interrupts should be disabled before we are called, as |
| 869 | * we modify Set Baud rate |
| 870 | * Set receive stale interrupt level, dependent on Bit Rate |
| 871 | * Goal is to have around 8 ms before indicate stale. |
| 872 | * roundup (((Bit Rate * .008) / 10) + 1 |
| 873 | */ |
| 874 | static void msm_hs_set_bps_locked(struct uart_port *uport, |
| 875 | unsigned int bps) |
| 876 | { |
| 877 | unsigned long rxstale; |
| 878 | unsigned long data; |
| 879 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 880 | |
| 881 | switch (bps) { |
| 882 | case 300: |
| 883 | msm_hs_write(uport, UART_DM_CSR, 0x00); |
| 884 | rxstale = 1; |
| 885 | break; |
| 886 | case 600: |
| 887 | msm_hs_write(uport, UART_DM_CSR, 0x11); |
| 888 | rxstale = 1; |
| 889 | break; |
| 890 | case 1200: |
| 891 | msm_hs_write(uport, UART_DM_CSR, 0x22); |
| 892 | rxstale = 1; |
| 893 | break; |
| 894 | case 2400: |
| 895 | msm_hs_write(uport, UART_DM_CSR, 0x33); |
| 896 | rxstale = 1; |
| 897 | break; |
| 898 | case 4800: |
| 899 | msm_hs_write(uport, UART_DM_CSR, 0x44); |
| 900 | rxstale = 1; |
| 901 | break; |
| 902 | case 9600: |
| 903 | msm_hs_write(uport, UART_DM_CSR, 0x55); |
| 904 | rxstale = 2; |
| 905 | break; |
| 906 | case 14400: |
| 907 | msm_hs_write(uport, UART_DM_CSR, 0x66); |
| 908 | rxstale = 3; |
| 909 | break; |
| 910 | case 19200: |
| 911 | msm_hs_write(uport, UART_DM_CSR, 0x77); |
| 912 | rxstale = 4; |
| 913 | break; |
| 914 | case 28800: |
| 915 | msm_hs_write(uport, UART_DM_CSR, 0x88); |
| 916 | rxstale = 6; |
| 917 | break; |
| 918 | case 38400: |
| 919 | msm_hs_write(uport, UART_DM_CSR, 0x99); |
| 920 | rxstale = 8; |
| 921 | break; |
| 922 | case 57600: |
| 923 | msm_hs_write(uport, UART_DM_CSR, 0xaa); |
| 924 | rxstale = 16; |
| 925 | break; |
| 926 | case 76800: |
| 927 | msm_hs_write(uport, UART_DM_CSR, 0xbb); |
| 928 | rxstale = 16; |
| 929 | break; |
| 930 | case 115200: |
| 931 | msm_hs_write(uport, UART_DM_CSR, 0xcc); |
| 932 | rxstale = 31; |
| 933 | break; |
| 934 | case 230400: |
| 935 | msm_hs_write(uport, UART_DM_CSR, 0xee); |
| 936 | rxstale = 31; |
| 937 | break; |
| 938 | case 460800: |
| 939 | msm_hs_write(uport, UART_DM_CSR, 0xff); |
| 940 | rxstale = 31; |
| 941 | break; |
| 942 | case 4000000: |
| 943 | case 3686400: |
| 944 | case 3200000: |
| 945 | case 3500000: |
| 946 | case 3000000: |
| 947 | case 2500000: |
| 948 | case 2000000: |
| 949 | case 1500000: |
| 950 | case 1152000: |
| 951 | case 1000000: |
| 952 | case 921600: |
| 953 | msm_hs_write(uport, UART_DM_CSR, 0xff); |
| 954 | rxstale = 31; |
| 955 | break; |
| 956 | default: |
| 957 | msm_hs_write(uport, UART_DM_CSR, 0xff); |
| 958 | /* default to 9600 */ |
| 959 | bps = 9600; |
| 960 | rxstale = 2; |
| 961 | break; |
| 962 | } |
| 963 | /* |
| 964 | * uart baud rate depends on CSR and MND Values |
| 965 | * we are updating CSR before and then calling |
| 966 | * clk_set_rate which updates MND Values. Hence |
| 967 | * dsb requires here. |
| 968 | */ |
| 969 | mb(); |
| 970 | if (bps > 460800) { |
| 971 | uport->uartclk = bps * 16; |
| 972 | /* BLSP based UART supports maximum clock frequency |
| 973 | * of 63.16 Mhz. With this (63.16 Mhz) clock frequency |
| 974 | * UART can support baud rate of 3.94 Mbps which is |
| 975 | * equivalent to 4 Mbps. |
| 976 | * UART hardware is robust enough to handle this |
| 977 | * deviation to achieve baud rate ~4 Mbps. |
| 978 | */ |
| 979 | if (bps == 4000000) |
| 980 | uport->uartclk = BLSP_UART_CLK_FMAX; |
| 981 | } else { |
| 982 | uport->uartclk = 7372800; |
| 983 | } |
| 984 | |
| 985 | if (clk_set_rate(msm_uport->clk, uport->uartclk)) { |
| 986 | MSM_HS_WARN("Error setting clock rate on UART\n"); |
| 987 | WARN_ON(1); |
| 988 | } |
| 989 | |
| 990 | data = rxstale & UARTDM_IPR_STALE_LSB_BMSK; |
| 991 | data |= UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK & (rxstale << 2); |
| 992 | |
| 993 | msm_hs_write(uport, UART_DM_IPR, data); |
| 994 | /* |
| 995 | * It is suggested to do reset of transmitter and receiver after |
| 996 | * changing any protocol configuration. Here Baud rate and stale |
| 997 | * timeout are getting updated. Hence reset transmitter and receiver. |
| 998 | */ |
| 999 | msm_hs_write(uport, UART_DM_CR, RESET_TX); |
| 1000 | msm_hs_write(uport, UART_DM_CR, RESET_RX); |
| 1001 | } |
| 1002 | |
| 1003 | |
| 1004 | static void msm_hs_set_std_bps_locked(struct uart_port *uport, |
| 1005 | unsigned int bps) |
| 1006 | { |
| 1007 | unsigned long rxstale; |
| 1008 | unsigned long data; |
| 1009 | |
| 1010 | switch (bps) { |
| 1011 | case 9600: |
| 1012 | msm_hs_write(uport, UART_DM_CSR, 0x99); |
| 1013 | rxstale = 2; |
| 1014 | break; |
| 1015 | case 14400: |
| 1016 | msm_hs_write(uport, UART_DM_CSR, 0xaa); |
| 1017 | rxstale = 3; |
| 1018 | break; |
| 1019 | case 19200: |
| 1020 | msm_hs_write(uport, UART_DM_CSR, 0xbb); |
| 1021 | rxstale = 4; |
| 1022 | break; |
| 1023 | case 28800: |
| 1024 | msm_hs_write(uport, UART_DM_CSR, 0xcc); |
| 1025 | rxstale = 6; |
| 1026 | break; |
| 1027 | case 38400: |
| 1028 | msm_hs_write(uport, UART_DM_CSR, 0xdd); |
| 1029 | rxstale = 8; |
| 1030 | break; |
| 1031 | case 57600: |
| 1032 | msm_hs_write(uport, UART_DM_CSR, 0xee); |
| 1033 | rxstale = 16; |
| 1034 | break; |
| 1035 | case 115200: |
| 1036 | msm_hs_write(uport, UART_DM_CSR, 0xff); |
| 1037 | rxstale = 31; |
| 1038 | break; |
| 1039 | default: |
| 1040 | msm_hs_write(uport, UART_DM_CSR, 0x99); |
| 1041 | /* default to 9600 */ |
| 1042 | bps = 9600; |
| 1043 | rxstale = 2; |
| 1044 | break; |
| 1045 | } |
| 1046 | |
| 1047 | data = rxstale & UARTDM_IPR_STALE_LSB_BMSK; |
| 1048 | data |= UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK & (rxstale << 2); |
| 1049 | |
| 1050 | msm_hs_write(uport, UART_DM_IPR, data); |
| 1051 | } |
| 1052 | |
| 1053 | static void msm_hs_enable_flow_control(struct uart_port *uport, bool override) |
| 1054 | { |
| 1055 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1056 | unsigned int data; |
| 1057 | |
| 1058 | if (msm_uport->flow_control || override) { |
| 1059 | /* Enable RFR line */ |
| 1060 | msm_hs_write(uport, UART_DM_CR, RFR_LOW); |
| 1061 | /* Enable auto RFR */ |
| 1062 | data = msm_hs_read(uport, UART_DM_MR1); |
| 1063 | data |= UARTDM_MR1_RX_RDY_CTL_BMSK; |
| 1064 | msm_hs_write(uport, UART_DM_MR1, data); |
| 1065 | /* Ensure register IO completion */ |
| 1066 | mb(); |
| 1067 | } |
| 1068 | } |
| 1069 | |
| 1070 | static void msm_hs_disable_flow_control(struct uart_port *uport, bool override) |
| 1071 | { |
| 1072 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1073 | unsigned int data; |
| 1074 | |
| 1075 | /* |
| 1076 | * Clear the Rx Ready Ctl bit - This ensures that |
| 1077 | * flow control lines stop the other side from sending |
| 1078 | * data while we change the parameters |
| 1079 | */ |
| 1080 | |
| 1081 | if (msm_uport->flow_control || override) { |
| 1082 | data = msm_hs_read(uport, UART_DM_MR1); |
| 1083 | /* disable auto ready-for-receiving */ |
| 1084 | data &= ~UARTDM_MR1_RX_RDY_CTL_BMSK; |
| 1085 | msm_hs_write(uport, UART_DM_MR1, data); |
| 1086 | /* Disable RFR line */ |
| 1087 | msm_hs_write(uport, UART_DM_CR, RFR_HIGH); |
| 1088 | /* Ensure register IO completion */ |
| 1089 | mb(); |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | /* |
| 1094 | * termios : new ktermios |
| 1095 | * oldtermios: old ktermios previous setting |
| 1096 | * |
| 1097 | * Configure the serial port |
| 1098 | */ |
| 1099 | static void msm_hs_set_termios(struct uart_port *uport, |
| 1100 | struct ktermios *termios, |
| 1101 | struct ktermios *oldtermios) |
| 1102 | { |
| 1103 | unsigned int bps; |
| 1104 | unsigned long data; |
| 1105 | unsigned int c_cflag = termios->c_cflag; |
| 1106 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1107 | |
| 1108 | /** |
| 1109 | * set_termios can be invoked from the framework when |
| 1110 | * the clocks are off and the client has not had a chance |
| 1111 | * to turn them on. Make sure that they are on |
| 1112 | */ |
| 1113 | msm_hs_resource_vote(msm_uport); |
| 1114 | mutex_lock(&msm_uport->mtx); |
| 1115 | msm_hs_write(uport, UART_DM_IMR, 0); |
| 1116 | |
| 1117 | msm_hs_disable_flow_control(uport, true); |
| 1118 | |
| 1119 | /* |
| 1120 | * Disable Rx channel of UARTDM |
| 1121 | * DMA Rx Stall happens if enqueue and flush of Rx command happens |
| 1122 | * concurrently. Hence before changing the baud rate/protocol |
| 1123 | * configuration and sending flush command to ADM, disable the Rx |
| 1124 | * channel of UARTDM. |
| 1125 | * Note: should not reset the receiver here immediately as it is not |
| 1126 | * suggested to do disable/reset or reset/disable at the same time. |
| 1127 | */ |
| 1128 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 1129 | /* Disable UARTDM RX BAM Interface */ |
| 1130 | data &= ~UARTDM_RX_BAM_ENABLE_BMSK; |
| 1131 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 1132 | |
| 1133 | /* |
| 1134 | * Reset RX and TX. |
| 1135 | * Resetting the RX enables it, therefore we must reset and disable. |
| 1136 | */ |
| 1137 | msm_hs_write(uport, UART_DM_CR, RESET_RX); |
| 1138 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_RX_DISABLE_BMSK); |
| 1139 | msm_hs_write(uport, UART_DM_CR, RESET_TX); |
| 1140 | |
| 1141 | /* 300 is the minimum baud support by the driver */ |
| 1142 | bps = uart_get_baud_rate(uport, termios, oldtermios, 200, 4000000); |
| 1143 | |
| 1144 | /* Temporary remapping 200 BAUD to 3.2 mbps */ |
| 1145 | if (bps == 200) |
| 1146 | bps = 3200000; |
| 1147 | |
| 1148 | uport->uartclk = clk_get_rate(msm_uport->clk); |
| 1149 | if (!uport->uartclk) |
| 1150 | msm_hs_set_std_bps_locked(uport, bps); |
| 1151 | else |
| 1152 | msm_hs_set_bps_locked(uport, bps); |
| 1153 | |
| 1154 | data = msm_hs_read(uport, UART_DM_MR2); |
| 1155 | data &= ~UARTDM_MR2_PARITY_MODE_BMSK; |
| 1156 | /* set parity */ |
| 1157 | if (c_cflag & PARENB) { |
| 1158 | if (c_cflag & PARODD) |
| 1159 | data |= ODD_PARITY; |
| 1160 | else if (c_cflag & CMSPAR) |
| 1161 | data |= SPACE_PARITY; |
| 1162 | else |
| 1163 | data |= EVEN_PARITY; |
| 1164 | } |
| 1165 | |
| 1166 | /* Set bits per char */ |
| 1167 | data &= ~UARTDM_MR2_BITS_PER_CHAR_BMSK; |
| 1168 | |
| 1169 | switch (c_cflag & CSIZE) { |
| 1170 | case CS5: |
| 1171 | data |= FIVE_BPC; |
| 1172 | break; |
| 1173 | case CS6: |
| 1174 | data |= SIX_BPC; |
| 1175 | break; |
| 1176 | case CS7: |
| 1177 | data |= SEVEN_BPC; |
| 1178 | break; |
| 1179 | default: |
| 1180 | data |= EIGHT_BPC; |
| 1181 | break; |
| 1182 | } |
| 1183 | /* stop bits */ |
| 1184 | if (c_cflag & CSTOPB) { |
| 1185 | data |= STOP_BIT_TWO; |
| 1186 | } else { |
| 1187 | /* otherwise 1 stop bit */ |
| 1188 | data |= STOP_BIT_ONE; |
| 1189 | } |
| 1190 | data |= UARTDM_MR2_ERROR_MODE_BMSK; |
| 1191 | /* write parity/bits per char/stop bit configuration */ |
| 1192 | msm_hs_write(uport, UART_DM_MR2, data); |
| 1193 | |
| 1194 | uport->ignore_status_mask = termios->c_iflag & INPCK; |
| 1195 | uport->ignore_status_mask |= termios->c_iflag & IGNPAR; |
| 1196 | uport->ignore_status_mask |= termios->c_iflag & IGNBRK; |
| 1197 | |
| 1198 | uport->read_status_mask = (termios->c_cflag & CREAD); |
| 1199 | |
| 1200 | /* Set Transmit software time out */ |
| 1201 | uart_update_timeout(uport, c_cflag, bps); |
| 1202 | |
| 1203 | /* Enable UARTDM Rx BAM Interface */ |
| 1204 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 1205 | data |= UARTDM_RX_BAM_ENABLE_BMSK; |
| 1206 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 1207 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_RX_EN_BMSK); |
| 1208 | /* Issue TX,RX BAM Start IFC command */ |
| 1209 | msm_hs_write(uport, UART_DM_CR, START_TX_BAM_IFC); |
| 1210 | msm_hs_write(uport, UART_DM_CR, START_RX_BAM_IFC); |
| 1211 | /* Ensure Register Writes Complete */ |
| 1212 | mb(); |
| 1213 | |
| 1214 | /* Configure HW flow control |
| 1215 | * UART Core would see status of CTS line when it is sending data |
| 1216 | * to remote uart to confirm that it can receive or not. |
| 1217 | * UART Core would trigger RFR if it is not having any space with |
| 1218 | * RX FIFO. |
| 1219 | */ |
| 1220 | /* Pulling RFR line high */ |
| 1221 | msm_hs_write(uport, UART_DM_CR, RFR_LOW); |
| 1222 | data = msm_hs_read(uport, UART_DM_MR1); |
| 1223 | data &= ~(UARTDM_MR1_CTS_CTL_BMSK | UARTDM_MR1_RX_RDY_CTL_BMSK); |
| 1224 | if (c_cflag & CRTSCTS) { |
| 1225 | data |= UARTDM_MR1_CTS_CTL_BMSK; |
| 1226 | data |= UARTDM_MR1_RX_RDY_CTL_BMSK; |
| 1227 | msm_uport->flow_control = true; |
| 1228 | } |
| 1229 | msm_hs_write(uport, UART_DM_MR1, data); |
| 1230 | MSM_HS_INFO("%s: Cflags 0x%x Baud %u\n", __func__, c_cflag, bps); |
| 1231 | |
| 1232 | mutex_unlock(&msm_uport->mtx); |
| 1233 | |
| 1234 | msm_hs_resource_unvote(msm_uport); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * Standard API, Transmitter |
| 1239 | * Any character in the transmit shift register is sent |
| 1240 | */ |
| 1241 | unsigned int msm_hs_tx_empty(struct uart_port *uport) |
| 1242 | { |
| 1243 | unsigned int data; |
| 1244 | unsigned int isr; |
| 1245 | unsigned int ret = 0; |
| 1246 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1247 | |
| 1248 | msm_hs_resource_vote(msm_uport); |
| 1249 | data = msm_hs_read(uport, UART_DM_SR); |
| 1250 | isr = msm_hs_read(uport, UART_DM_ISR); |
| 1251 | msm_hs_resource_unvote(msm_uport); |
| 1252 | MSM_HS_INFO("%s(): SR:0x%x ISR:0x%x ", __func__, data, isr); |
| 1253 | |
| 1254 | if (data & UARTDM_SR_TXEMT_BMSK) { |
| 1255 | ret = TIOCSER_TEMT; |
| 1256 | } else |
| 1257 | /* |
| 1258 | * Add an extra sleep here because sometimes the framework's |
| 1259 | * delay (based on baud rate) isn't good enough. |
| 1260 | * Note that this won't happen during every port close, only |
| 1261 | * on select occassions when the userspace does back to back |
| 1262 | * write() and close(). |
| 1263 | */ |
| 1264 | usleep_range(5000, 7000); |
| 1265 | |
| 1266 | return ret; |
| 1267 | } |
| 1268 | EXPORT_SYMBOL(msm_hs_tx_empty); |
| 1269 | |
| 1270 | /* |
| 1271 | * Standard API, Stop transmitter. |
| 1272 | * Any character in the transmit shift register is sent as |
| 1273 | * well as the current data mover transfer . |
| 1274 | */ |
| 1275 | static void msm_hs_stop_tx_locked(struct uart_port *uport) |
| 1276 | { |
| 1277 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1278 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 1279 | |
| 1280 | tx->flush = FLUSH_STOP; |
| 1281 | } |
| 1282 | |
| 1283 | static int disconnect_rx_endpoint(struct msm_hs_port *msm_uport) |
| 1284 | { |
| 1285 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1286 | struct sps_pipe *sps_pipe_handle = rx->prod.pipe_handle; |
| 1287 | int ret = 0; |
| 1288 | |
| 1289 | ret = sps_rx_disconnect(sps_pipe_handle); |
| 1290 | |
| 1291 | if (msm_uport->rx.pending_flag) |
| 1292 | MSM_HS_WARN("%s(): Buffers may be pending 0x%lx", |
| 1293 | __func__, msm_uport->rx.pending_flag); |
| 1294 | MSM_HS_DBG("%s(): clearing desc usage flag", __func__); |
| 1295 | msm_uport->rx.queued_flag = 0; |
| 1296 | msm_uport->rx.pending_flag = 0; |
| 1297 | msm_uport->rx.rx_inx = 0; |
| 1298 | |
| 1299 | if (ret) |
| 1300 | MSM_HS_ERR("%s(): sps_disconnect failed\n", __func__); |
| 1301 | msm_uport->rx.flush = FLUSH_SHUTDOWN; |
| 1302 | MSM_HS_DBG("%s: Calling Completion\n", __func__); |
| 1303 | wake_up(&msm_uport->bam_disconnect_wait); |
| 1304 | MSM_HS_DBG("%s: Done Completion\n", __func__); |
| 1305 | wake_up(&msm_uport->rx.wait); |
| 1306 | return ret; |
| 1307 | } |
| 1308 | |
| 1309 | static int sps_tx_disconnect(struct msm_hs_port *msm_uport) |
| 1310 | { |
| 1311 | struct uart_port *uport = &msm_uport->uport; |
| 1312 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 1313 | struct sps_pipe *tx_pipe = tx->cons.pipe_handle; |
| 1314 | unsigned long flags; |
| 1315 | int ret = 0; |
| 1316 | |
| 1317 | if (msm_uport->tx.flush == FLUSH_SHUTDOWN) { |
| 1318 | MSM_HS_DBG("%s(): pipe already disonnected", __func__); |
| 1319 | return ret; |
| 1320 | } |
| 1321 | |
| 1322 | ret = sps_disconnect(tx_pipe); |
| 1323 | |
| 1324 | if (ret) { |
| 1325 | MSM_HS_ERR("%s(): sps_disconnect failed %d", __func__, ret); |
| 1326 | return ret; |
| 1327 | } |
| 1328 | |
| 1329 | spin_lock_irqsave(&uport->lock, flags); |
| 1330 | msm_uport->tx.flush = FLUSH_SHUTDOWN; |
| 1331 | spin_unlock_irqrestore(&uport->lock, flags); |
| 1332 | |
| 1333 | MSM_HS_DBG("%s(): TX Disconnect", __func__); |
| 1334 | return ret; |
| 1335 | } |
| 1336 | |
| 1337 | static void msm_hs_disable_rx(struct uart_port *uport) |
| 1338 | { |
| 1339 | unsigned int data; |
| 1340 | |
| 1341 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 1342 | data &= ~UARTDM_RX_BAM_ENABLE_BMSK; |
| 1343 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 1344 | } |
| 1345 | |
| 1346 | /* |
| 1347 | * Standard API, Stop receiver as soon as possible. |
| 1348 | * |
| 1349 | * Function immediately terminates the operation of the |
| 1350 | * channel receiver and any incoming characters are lost. None |
| 1351 | * of the receiver status bits are affected by this command and |
| 1352 | * characters that are already in the receive FIFO there. |
| 1353 | */ |
| 1354 | static void msm_hs_stop_rx_locked(struct uart_port *uport) |
| 1355 | { |
| 1356 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1357 | |
| 1358 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) |
| 1359 | MSM_HS_WARN("%s(): Clocks are off\n", __func__); |
| 1360 | else |
| 1361 | msm_hs_disable_rx(uport); |
| 1362 | |
| 1363 | if (msm_uport->rx.flush == FLUSH_NONE) |
| 1364 | msm_uport->rx.flush = FLUSH_STOP; |
| 1365 | } |
| 1366 | |
| 1367 | static void msm_hs_disconnect_rx(struct uart_port *uport) |
| 1368 | { |
| 1369 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1370 | |
| 1371 | msm_hs_disable_rx(uport); |
| 1372 | /* Disconnect the BAM RX pipe */ |
| 1373 | if (msm_uport->rx.flush == FLUSH_NONE) |
| 1374 | msm_uport->rx.flush = FLUSH_STOP; |
| 1375 | disconnect_rx_endpoint(msm_uport); |
| 1376 | MSM_HS_DBG("%s(): rx->flush %d", __func__, msm_uport->rx.flush); |
| 1377 | } |
| 1378 | |
| 1379 | /* Tx timeout callback function */ |
| 1380 | void tx_timeout_handler(unsigned long arg) |
| 1381 | { |
| 1382 | struct msm_hs_port *msm_uport = (struct msm_hs_port *) arg; |
| 1383 | struct uart_port *uport = &msm_uport->uport; |
| 1384 | int isr; |
| 1385 | |
| 1386 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) { |
| 1387 | MSM_HS_WARN("%s(): clocks are off", __func__); |
| 1388 | return; |
| 1389 | } |
| 1390 | |
| 1391 | isr = msm_hs_read(uport, UART_DM_ISR); |
| 1392 | if (UARTDM_ISR_CURRENT_CTS_BMSK & isr) |
| 1393 | MSM_HS_WARN("%s(): CTS Disabled, ISR 0x%x", __func__, isr); |
| 1394 | dump_uart_hs_registers(msm_uport); |
| 1395 | } |
| 1396 | |
| 1397 | /* Transmit the next chunk of data */ |
| 1398 | static void msm_hs_submit_tx_locked(struct uart_port *uport) |
| 1399 | { |
| 1400 | int left; |
| 1401 | int tx_count; |
| 1402 | int aligned_tx_count; |
| 1403 | dma_addr_t src_addr; |
| 1404 | dma_addr_t aligned_src_addr; |
| 1405 | u32 flags = SPS_IOVEC_FLAG_EOT | SPS_IOVEC_FLAG_INT; |
| 1406 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1407 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 1408 | struct circ_buf *tx_buf = &msm_uport->uport.state->xmit; |
| 1409 | struct sps_pipe *sps_pipe_handle; |
| 1410 | int ret; |
| 1411 | |
| 1412 | if (uart_circ_empty(tx_buf) || uport->state->port.tty->stopped) { |
| 1413 | tx->dma_in_flight = false; |
| 1414 | msm_hs_stop_tx_locked(uport); |
| 1415 | return; |
| 1416 | } |
| 1417 | |
| 1418 | tx_count = uart_circ_chars_pending(tx_buf); |
| 1419 | |
| 1420 | if (tx_count > UARTDM_TX_BUF_SIZE) |
| 1421 | tx_count = UARTDM_TX_BUF_SIZE; |
| 1422 | |
| 1423 | left = UART_XMIT_SIZE - tx_buf->tail; |
| 1424 | |
| 1425 | if (tx_count > left) |
| 1426 | tx_count = left; |
| 1427 | |
| 1428 | src_addr = tx->dma_base + tx_buf->tail; |
| 1429 | /* Mask the src_addr to align on a cache |
| 1430 | * and add those bytes to tx_count |
| 1431 | */ |
| 1432 | aligned_src_addr = src_addr & ~(dma_get_cache_alignment() - 1); |
| 1433 | aligned_tx_count = tx_count + src_addr - aligned_src_addr; |
| 1434 | |
| 1435 | dma_sync_single_for_device(uport->dev, aligned_src_addr, |
| 1436 | aligned_tx_count, DMA_TO_DEVICE); |
| 1437 | |
| 1438 | tx->tx_count = tx_count; |
| 1439 | |
| 1440 | hex_dump_ipc(msm_uport, tx->ipc_tx_ctxt, "Tx", |
| 1441 | &tx_buf->buf[tx_buf->tail], (u64)src_addr, tx_count); |
| 1442 | sps_pipe_handle = tx->cons.pipe_handle; |
| 1443 | |
| 1444 | /* Set 1 second timeout */ |
| 1445 | mod_timer(&tx->tx_timeout_timer, |
| 1446 | jiffies + msecs_to_jiffies(MSEC_PER_SEC)); |
| 1447 | /* Queue transfer request to SPS */ |
| 1448 | ret = sps_transfer_one(sps_pipe_handle, src_addr, tx_count, |
| 1449 | msm_uport, flags); |
| 1450 | |
| 1451 | MSM_HS_DBG("%s:Enqueue Tx Cmd, ret %d\n", __func__, ret); |
| 1452 | } |
| 1453 | |
| 1454 | /* This function queues the rx descriptor for BAM transfer */ |
| 1455 | static void msm_hs_post_rx_desc(struct msm_hs_port *msm_uport, int inx) |
| 1456 | { |
| 1457 | u32 flags = SPS_IOVEC_FLAG_INT; |
| 1458 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1459 | int ret; |
| 1460 | |
| 1461 | phys_addr_t rbuff_addr = rx->rbuffer + (UARTDM_RX_BUF_SIZE * inx); |
| 1462 | u8 *virt_addr = rx->buffer + (UARTDM_RX_BUF_SIZE * inx); |
| 1463 | |
| 1464 | MSM_HS_DBG("%s: %d:Queue desc %d, 0x%llx, base 0x%llx virtaddr %p", |
| 1465 | __func__, msm_uport->uport.line, inx, |
| 1466 | (u64)rbuff_addr, (u64)rx->rbuffer, virt_addr); |
| 1467 | |
| 1468 | rx->iovec[inx].size = 0; |
| 1469 | ret = sps_transfer_one(rx->prod.pipe_handle, rbuff_addr, |
| 1470 | UARTDM_RX_BUF_SIZE, msm_uport, flags); |
| 1471 | |
| 1472 | if (ret) |
| 1473 | MSM_HS_ERR("Error processing descriptor %d", ret); |
| 1474 | } |
| 1475 | |
| 1476 | /* Update the rx descriptor index to specify the next one to be processed */ |
| 1477 | static void msm_hs_mark_next(struct msm_hs_port *msm_uport, int inx) |
| 1478 | { |
| 1479 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1480 | int prev; |
| 1481 | |
| 1482 | inx %= UART_DMA_DESC_NR; |
| 1483 | MSM_HS_DBG("%s(): inx %d, pending 0x%lx", __func__, inx, |
| 1484 | rx->pending_flag); |
| 1485 | |
| 1486 | if (!inx) |
| 1487 | prev = UART_DMA_DESC_NR - 1; |
| 1488 | else |
| 1489 | prev = inx - 1; |
| 1490 | |
| 1491 | if (!test_bit(prev, &rx->pending_flag)) |
| 1492 | msm_uport->rx.rx_inx = inx; |
| 1493 | MSM_HS_DBG("%s(): prev %d pending flag 0x%lx, next %d", __func__, |
| 1494 | prev, rx->pending_flag, msm_uport->rx.rx_inx); |
| 1495 | } |
| 1496 | |
| 1497 | /* |
| 1498 | * Queue the rx descriptor that has just been processed or |
| 1499 | * all of them if queueing for the first time |
| 1500 | */ |
| 1501 | static void msm_hs_queue_rx_desc(struct msm_hs_port *msm_uport) |
| 1502 | { |
| 1503 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1504 | int i, flag = 0; |
| 1505 | |
| 1506 | /* At first, queue all, if not, queue only one */ |
| 1507 | if (rx->queued_flag || rx->pending_flag) { |
| 1508 | if (!test_bit(rx->rx_inx, &rx->queued_flag) && |
| 1509 | !test_bit(rx->rx_inx, &rx->pending_flag)) { |
| 1510 | msm_hs_post_rx_desc(msm_uport, rx->rx_inx); |
| 1511 | set_bit(rx->rx_inx, &rx->queued_flag); |
| 1512 | MSM_HS_DBG("%s(): Set Queued Bit %d", |
| 1513 | __func__, rx->rx_inx); |
| 1514 | } else |
| 1515 | MSM_HS_ERR("%s(): rx_inx pending or queued", __func__); |
| 1516 | return; |
| 1517 | } |
| 1518 | |
| 1519 | for (i = 0; i < UART_DMA_DESC_NR; i++) { |
| 1520 | if (!test_bit(i, &rx->queued_flag) && |
| 1521 | !test_bit(i, &rx->pending_flag)) { |
| 1522 | MSM_HS_DBG("%s(): Calling post rx %d", __func__, i); |
| 1523 | msm_hs_post_rx_desc(msm_uport, i); |
| 1524 | set_bit(i, &rx->queued_flag); |
| 1525 | flag = 1; |
| 1526 | } |
| 1527 | } |
| 1528 | |
| 1529 | if (!flag) |
| 1530 | MSM_HS_ERR("%s(): error queueing descriptor", __func__); |
| 1531 | } |
| 1532 | |
| 1533 | /* Start to receive the next chunk of data */ |
| 1534 | static void msm_hs_start_rx_locked(struct uart_port *uport) |
| 1535 | { |
| 1536 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1537 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1538 | unsigned int buffer_pending = msm_uport->rx.buffer_pending; |
| 1539 | unsigned int data; |
| 1540 | |
| 1541 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) { |
| 1542 | MSM_HS_WARN("%s(): Clocks are off\n", __func__); |
| 1543 | return; |
| 1544 | } |
| 1545 | if (rx->pending_flag) { |
| 1546 | MSM_HS_INFO("%s: Rx Cmd got executed, wait for rx_tlet\n", |
| 1547 | __func__); |
| 1548 | rx->flush = FLUSH_IGNORE; |
| 1549 | return; |
| 1550 | } |
| 1551 | if (buffer_pending) |
| 1552 | MSM_HS_ERR("Error: rx started in buffer state =%x", |
| 1553 | buffer_pending); |
| 1554 | |
| 1555 | msm_hs_write(uport, UART_DM_CR, RESET_STALE_INT); |
| 1556 | msm_hs_write(uport, UART_DM_DMRX, UARTDM_RX_BUF_SIZE); |
| 1557 | msm_hs_write(uport, UART_DM_CR, STALE_EVENT_ENABLE); |
| 1558 | /* |
| 1559 | * Enable UARTDM Rx Interface as previously it has been |
| 1560 | * disable in set_termios before configuring baud rate. |
| 1561 | */ |
| 1562 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 1563 | /* Enable UARTDM Rx BAM Interface */ |
| 1564 | data |= UARTDM_RX_BAM_ENABLE_BMSK; |
| 1565 | |
| 1566 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 1567 | msm_hs_write(uport, UART_DM_IMR, msm_uport->imr_reg); |
| 1568 | /* Calling next DMOV API. Hence mb() here. */ |
| 1569 | mb(); |
| 1570 | |
| 1571 | /* |
| 1572 | * RX-transfer will be automatically re-activated |
| 1573 | * after last data of previous transfer was read. |
| 1574 | */ |
| 1575 | data = (RX_STALE_AUTO_RE_EN | RX_TRANS_AUTO_RE_ACTIVATE | |
| 1576 | RX_DMRX_CYCLIC_EN); |
| 1577 | msm_hs_write(uport, UART_DM_RX_TRANS_CTRL, data); |
| 1578 | /* Issue RX BAM Start IFC command */ |
| 1579 | msm_hs_write(uport, UART_DM_CR, START_RX_BAM_IFC); |
| 1580 | /* Ensure register IO completion */ |
| 1581 | mb(); |
| 1582 | |
| 1583 | msm_uport->rx.flush = FLUSH_NONE; |
| 1584 | msm_uport->rx_bam_inprogress = true; |
| 1585 | msm_hs_queue_rx_desc(msm_uport); |
| 1586 | msm_uport->rx_bam_inprogress = false; |
| 1587 | wake_up(&msm_uport->rx.wait); |
| 1588 | MSM_HS_DBG("%s:Enqueue Rx Cmd\n", __func__); |
| 1589 | } |
| 1590 | |
| 1591 | static void flip_insert_work(struct work_struct *work) |
| 1592 | { |
| 1593 | unsigned long flags; |
| 1594 | int retval; |
| 1595 | struct msm_hs_port *msm_uport = |
| 1596 | container_of(work, struct msm_hs_port, |
| 1597 | rx.flip_insert_work.work); |
| 1598 | struct tty_struct *tty = msm_uport->uport.state->port.tty; |
| 1599 | |
| 1600 | spin_lock_irqsave(&msm_uport->uport.lock, flags); |
| 1601 | if (!tty || msm_uport->rx.flush == FLUSH_SHUTDOWN) { |
| 1602 | dev_err(msm_uport->uport.dev, |
| 1603 | "%s:Invalid driver state flush %d\n", |
| 1604 | __func__, msm_uport->rx.flush); |
| 1605 | MSM_HS_ERR("%s:Invalid driver state flush %d\n", |
| 1606 | __func__, msm_uport->rx.flush); |
| 1607 | spin_unlock_irqrestore(&msm_uport->uport.lock, flags); |
| 1608 | return; |
| 1609 | } |
| 1610 | |
| 1611 | if (msm_uport->rx.buffer_pending == NONE_PENDING) { |
| 1612 | MSM_HS_ERR("Error: No buffer pending in %s", __func__); |
| 1613 | spin_unlock_irqrestore(&msm_uport->uport.lock, flags); |
| 1614 | return; |
| 1615 | } |
| 1616 | if (msm_uport->rx.buffer_pending & FIFO_OVERRUN) { |
| 1617 | retval = tty_insert_flip_char(tty->port, 0, TTY_OVERRUN); |
| 1618 | if (retval) |
| 1619 | msm_uport->rx.buffer_pending &= ~FIFO_OVERRUN; |
| 1620 | } |
| 1621 | if (msm_uport->rx.buffer_pending & PARITY_ERROR) { |
| 1622 | retval = tty_insert_flip_char(tty->port, 0, TTY_PARITY); |
| 1623 | if (retval) |
| 1624 | msm_uport->rx.buffer_pending &= ~PARITY_ERROR; |
| 1625 | } |
| 1626 | if (msm_uport->rx.buffer_pending & CHARS_NORMAL) { |
| 1627 | int rx_count, rx_offset; |
| 1628 | |
| 1629 | rx_count = (msm_uport->rx.buffer_pending & 0xFFFF0000) >> 16; |
| 1630 | rx_offset = (msm_uport->rx.buffer_pending & 0xFFD0) >> 5; |
| 1631 | retval = tty_insert_flip_string(tty->port, |
| 1632 | msm_uport->rx.buffer + |
| 1633 | (msm_uport->rx.rx_inx * UARTDM_RX_BUF_SIZE) |
| 1634 | + rx_offset, rx_count); |
| 1635 | msm_uport->rx.buffer_pending &= (FIFO_OVERRUN | |
| 1636 | PARITY_ERROR); |
| 1637 | if (retval != rx_count) |
| 1638 | msm_uport->rx.buffer_pending |= CHARS_NORMAL | |
| 1639 | retval << 8 | (rx_count - retval) << 16; |
| 1640 | } |
| 1641 | if (msm_uport->rx.buffer_pending) { |
| 1642 | schedule_delayed_work(&msm_uport->rx.flip_insert_work, |
| 1643 | msecs_to_jiffies(RETRY_TIMEOUT)); |
| 1644 | } else if (msm_uport->rx.flush <= FLUSH_IGNORE) { |
| 1645 | MSM_HS_WARN("Pending buffers cleared, restarting"); |
| 1646 | clear_bit(msm_uport->rx.rx_inx, |
| 1647 | &msm_uport->rx.pending_flag); |
| 1648 | msm_hs_start_rx_locked(&msm_uport->uport); |
| 1649 | msm_hs_mark_next(msm_uport, msm_uport->rx.rx_inx+1); |
| 1650 | } |
| 1651 | spin_unlock_irqrestore(&msm_uport->uport.lock, flags); |
| 1652 | tty_flip_buffer_push(tty->port); |
| 1653 | } |
| 1654 | |
| 1655 | static void msm_serial_hs_rx_work(struct kthread_work *work) |
| 1656 | { |
| 1657 | int retval; |
| 1658 | int rx_count = 0; |
| 1659 | unsigned long status; |
| 1660 | unsigned long flags; |
| 1661 | unsigned int error_f = 0; |
| 1662 | struct uart_port *uport; |
| 1663 | struct msm_hs_port *msm_uport; |
| 1664 | unsigned int flush = FLUSH_DATA_INVALID; |
| 1665 | struct tty_struct *tty; |
| 1666 | struct sps_event_notify *notify; |
| 1667 | struct msm_hs_rx *rx; |
| 1668 | struct sps_pipe *sps_pipe_handle; |
| 1669 | struct platform_device *pdev; |
| 1670 | const struct msm_serial_hs_platform_data *pdata; |
| 1671 | |
| 1672 | msm_uport = container_of((struct kthread_work *) work, |
| 1673 | struct msm_hs_port, rx.kwork); |
| 1674 | msm_hs_resource_vote(msm_uport); |
| 1675 | uport = &msm_uport->uport; |
| 1676 | tty = uport->state->port.tty; |
| 1677 | notify = &msm_uport->notify; |
| 1678 | rx = &msm_uport->rx; |
| 1679 | pdev = to_platform_device(uport->dev); |
| 1680 | pdata = pdev->dev.platform_data; |
| 1681 | |
| 1682 | spin_lock_irqsave(&uport->lock, flags); |
| 1683 | |
| 1684 | if (!tty || rx->flush == FLUSH_SHUTDOWN) { |
| 1685 | dev_err(uport->dev, "%s:Invalid driver state flush %d\n", |
| 1686 | __func__, rx->flush); |
| 1687 | MSM_HS_ERR("%s:Invalid driver state flush %d\n", |
| 1688 | __func__, rx->flush); |
| 1689 | spin_unlock_irqrestore(&uport->lock, flags); |
| 1690 | msm_hs_resource_unvote(msm_uport); |
| 1691 | return; |
| 1692 | } |
| 1693 | |
| 1694 | /* |
| 1695 | * Process all pending descs or if nothing is |
| 1696 | * queued - called from termios |
| 1697 | */ |
| 1698 | while (!rx->buffer_pending && |
| 1699 | (rx->pending_flag || !rx->queued_flag)) { |
| 1700 | MSM_HS_DBG("%s(): Loop P 0x%lx Q 0x%lx", __func__, |
| 1701 | rx->pending_flag, rx->queued_flag); |
| 1702 | |
| 1703 | status = msm_hs_read(uport, UART_DM_SR); |
| 1704 | |
| 1705 | MSM_HS_DBG("In %s\n", __func__); |
| 1706 | |
| 1707 | /* overflow is not connect to data in a FIFO */ |
| 1708 | if (unlikely((status & UARTDM_SR_OVERRUN_BMSK) && |
| 1709 | (uport->read_status_mask & CREAD))) { |
| 1710 | retval = tty_insert_flip_char(tty->port, |
| 1711 | 0, TTY_OVERRUN); |
| 1712 | MSM_HS_WARN("%s(): RX Buffer Overrun Detected\n", |
| 1713 | __func__); |
| 1714 | if (!retval) |
| 1715 | msm_uport->rx.buffer_pending |= TTY_OVERRUN; |
| 1716 | uport->icount.buf_overrun++; |
| 1717 | error_f = 1; |
| 1718 | } |
| 1719 | |
| 1720 | if (!(uport->ignore_status_mask & INPCK)) |
| 1721 | status = status & ~(UARTDM_SR_PAR_FRAME_BMSK); |
| 1722 | |
| 1723 | if (unlikely(status & UARTDM_SR_PAR_FRAME_BMSK)) { |
| 1724 | /* Can not tell diff between parity & frame error */ |
| 1725 | MSM_HS_WARN("msm_serial_hs: parity error\n"); |
| 1726 | uport->icount.parity++; |
| 1727 | error_f = 1; |
| 1728 | if (!(uport->ignore_status_mask & IGNPAR)) { |
| 1729 | retval = tty_insert_flip_char(tty->port, |
| 1730 | 0, TTY_PARITY); |
| 1731 | if (!retval) |
| 1732 | msm_uport->rx.buffer_pending |
| 1733 | |= TTY_PARITY; |
| 1734 | } |
| 1735 | } |
| 1736 | |
| 1737 | if (unlikely(status & UARTDM_SR_RX_BREAK_BMSK)) { |
| 1738 | MSM_HS_DBG("msm_serial_hs: Rx break\n"); |
| 1739 | uport->icount.brk++; |
| 1740 | error_f = 1; |
| 1741 | if (!(uport->ignore_status_mask & IGNBRK)) { |
| 1742 | retval = tty_insert_flip_char(tty->port, |
| 1743 | 0, TTY_BREAK); |
| 1744 | if (!retval) |
| 1745 | msm_uport->rx.buffer_pending |
| 1746 | |= TTY_BREAK; |
| 1747 | } |
| 1748 | } |
| 1749 | |
| 1750 | if (error_f) |
| 1751 | msm_hs_write(uport, UART_DM_CR, RESET_ERROR_STATUS); |
| 1752 | flush = msm_uport->rx.flush; |
| 1753 | if (flush == FLUSH_IGNORE) |
| 1754 | if (!msm_uport->rx.buffer_pending) { |
| 1755 | MSM_HS_DBG("%s: calling start_rx_locked\n", |
| 1756 | __func__); |
| 1757 | msm_hs_start_rx_locked(uport); |
| 1758 | } |
| 1759 | if (flush >= FLUSH_DATA_INVALID) |
| 1760 | goto out; |
| 1761 | |
| 1762 | rx_count = msm_uport->rx.iovec[msm_uport->rx.rx_inx].size; |
| 1763 | hex_dump_ipc(msm_uport, rx->ipc_rx_ctxt, "Rx", |
| 1764 | (msm_uport->rx.buffer + |
| 1765 | (msm_uport->rx.rx_inx * UARTDM_RX_BUF_SIZE)), |
| 1766 | msm_uport->rx.iovec[msm_uport->rx.rx_inx].addr, |
| 1767 | rx_count); |
| 1768 | |
| 1769 | /* |
| 1770 | * We are in a spin locked context, spin lock taken at |
| 1771 | * other places where these flags are updated |
| 1772 | */ |
| 1773 | if (0 != (uport->read_status_mask & CREAD)) { |
| 1774 | if (!test_bit(msm_uport->rx.rx_inx, |
| 1775 | &msm_uport->rx.pending_flag) && |
| 1776 | !test_bit(msm_uport->rx.rx_inx, |
| 1777 | &msm_uport->rx.queued_flag)) |
| 1778 | MSM_HS_ERR("%s: RX INX not set", __func__); |
| 1779 | else if (test_bit(msm_uport->rx.rx_inx, |
| 1780 | &msm_uport->rx.pending_flag) && |
| 1781 | !test_bit(msm_uport->rx.rx_inx, |
| 1782 | &msm_uport->rx.queued_flag)) { |
| 1783 | MSM_HS_DBG("%s(): Clear Pending Bit %d", |
| 1784 | __func__, msm_uport->rx.rx_inx); |
| 1785 | |
| 1786 | retval = tty_insert_flip_string(tty->port, |
| 1787 | msm_uport->rx.buffer + |
| 1788 | (msm_uport->rx.rx_inx * |
| 1789 | UARTDM_RX_BUF_SIZE), |
| 1790 | rx_count); |
| 1791 | |
| 1792 | if (retval != rx_count) { |
| 1793 | MSM_HS_INFO("%s(): ret %d rx_count %d", |
| 1794 | __func__, retval, rx_count); |
| 1795 | msm_uport->rx.buffer_pending |= |
| 1796 | CHARS_NORMAL | retval << 5 | |
| 1797 | (rx_count - retval) << 16; |
| 1798 | } |
| 1799 | } else |
| 1800 | MSM_HS_ERR("%s: Error in inx %d", __func__, |
| 1801 | msm_uport->rx.rx_inx); |
| 1802 | } |
| 1803 | |
| 1804 | if (!msm_uport->rx.buffer_pending) { |
| 1805 | msm_uport->rx.flush = FLUSH_NONE; |
| 1806 | msm_uport->rx_bam_inprogress = true; |
| 1807 | sps_pipe_handle = rx->prod.pipe_handle; |
| 1808 | MSM_HS_DBG("Queing bam descriptor\n"); |
| 1809 | /* Queue transfer request to SPS */ |
| 1810 | clear_bit(msm_uport->rx.rx_inx, |
| 1811 | &msm_uport->rx.pending_flag); |
| 1812 | msm_hs_queue_rx_desc(msm_uport); |
| 1813 | msm_hs_mark_next(msm_uport, msm_uport->rx.rx_inx+1); |
| 1814 | msm_hs_write(uport, UART_DM_CR, START_RX_BAM_IFC); |
| 1815 | msm_uport->rx_bam_inprogress = false; |
| 1816 | wake_up(&msm_uport->rx.wait); |
| 1817 | } else |
| 1818 | break; |
| 1819 | |
| 1820 | } |
| 1821 | out: |
| 1822 | if (msm_uport->rx.buffer_pending) { |
| 1823 | MSM_HS_WARN("%s: tty buffer exhausted. Stalling\n", __func__); |
| 1824 | schedule_delayed_work(&msm_uport->rx.flip_insert_work |
| 1825 | , msecs_to_jiffies(RETRY_TIMEOUT)); |
| 1826 | } |
| 1827 | /* tty_flip_buffer_push() might call msm_hs_start(), so unlock */ |
| 1828 | spin_unlock_irqrestore(&uport->lock, flags); |
| 1829 | if (flush < FLUSH_DATA_INVALID) |
| 1830 | tty_flip_buffer_push(tty->port); |
| 1831 | msm_hs_resource_unvote(msm_uport); |
| 1832 | } |
| 1833 | |
| 1834 | static void msm_hs_start_tx_locked(struct uart_port *uport) |
| 1835 | { |
| 1836 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 1837 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 1838 | |
| 1839 | /* Bail if transfer in progress */ |
| 1840 | if (tx->flush < FLUSH_STOP || tx->dma_in_flight) { |
| 1841 | MSM_HS_INFO("%s(): retry, flush %d, dma_in_flight %d\n", |
| 1842 | __func__, tx->flush, tx->dma_in_flight); |
| 1843 | return; |
| 1844 | } |
| 1845 | |
| 1846 | if (!tx->dma_in_flight) { |
| 1847 | tx->dma_in_flight = true; |
| 1848 | kthread_queue_work(&msm_uport->tx.kworker, |
| 1849 | &msm_uport->tx.kwork); |
| 1850 | } |
| 1851 | } |
| 1852 | |
| 1853 | /** |
| 1854 | * Callback notification from SPS driver |
| 1855 | * |
| 1856 | * This callback function gets triggered called from |
| 1857 | * SPS driver when requested SPS data transfer is |
| 1858 | * completed. |
| 1859 | * |
| 1860 | */ |
| 1861 | |
| 1862 | static void msm_hs_sps_tx_callback(struct sps_event_notify *notify) |
| 1863 | { |
| 1864 | struct msm_hs_port *msm_uport = |
| 1865 | (struct msm_hs_port *) |
| 1866 | ((struct sps_event_notify *)notify)->user; |
| 1867 | phys_addr_t addr = DESC_FULL_ADDR(notify->data.transfer.iovec.flags, |
| 1868 | notify->data.transfer.iovec.addr); |
| 1869 | |
| 1870 | msm_uport->notify = *notify; |
| 1871 | MSM_HS_INFO("tx_cb: addr=0x%pa, size=0x%x, flags=0x%x\n", |
| 1872 | &addr, notify->data.transfer.iovec.size, |
| 1873 | notify->data.transfer.iovec.flags); |
| 1874 | |
| 1875 | del_timer(&msm_uport->tx.tx_timeout_timer); |
| 1876 | MSM_HS_DBG("%s(): Queue kthread work", __func__); |
| 1877 | kthread_queue_work(&msm_uport->tx.kworker, &msm_uport->tx.kwork); |
| 1878 | } |
| 1879 | |
| 1880 | static void msm_serial_hs_tx_work(struct kthread_work *work) |
| 1881 | { |
| 1882 | unsigned long flags; |
| 1883 | struct msm_hs_port *msm_uport = |
| 1884 | container_of((struct kthread_work *)work, |
| 1885 | struct msm_hs_port, tx.kwork); |
| 1886 | struct uart_port *uport = &msm_uport->uport; |
| 1887 | struct circ_buf *tx_buf = &uport->state->xmit; |
| 1888 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 1889 | |
| 1890 | /* |
| 1891 | * Do the work buffer related work in BAM |
| 1892 | * mode that is equivalent to legacy mode |
| 1893 | */ |
| 1894 | msm_hs_resource_vote(msm_uport); |
| 1895 | if (tx->flush >= FLUSH_STOP) { |
| 1896 | spin_lock_irqsave(&(msm_uport->uport.lock), flags); |
| 1897 | tx->flush = FLUSH_NONE; |
| 1898 | MSM_HS_DBG("%s(): calling submit_tx", __func__); |
| 1899 | msm_hs_submit_tx_locked(uport); |
| 1900 | spin_unlock_irqrestore(&(msm_uport->uport.lock), flags); |
| 1901 | msm_hs_resource_unvote(msm_uport); |
| 1902 | return; |
| 1903 | } |
| 1904 | |
| 1905 | spin_lock_irqsave(&(msm_uport->uport.lock), flags); |
| 1906 | if (!uart_circ_empty(tx_buf)) |
| 1907 | tx_buf->tail = (tx_buf->tail + |
| 1908 | tx->tx_count) & ~UART_XMIT_SIZE; |
| 1909 | else |
| 1910 | MSM_HS_DBG("%s:circ buffer is empty\n", __func__); |
| 1911 | |
| 1912 | wake_up(&msm_uport->tx.wait); |
| 1913 | |
| 1914 | uport->icount.tx += tx->tx_count; |
| 1915 | |
| 1916 | /* |
| 1917 | * Calling to send next chunk of data |
| 1918 | * If the circ buffer is empty, we stop |
| 1919 | * If the clock off was requested, the clock |
| 1920 | * off sequence is kicked off |
| 1921 | */ |
| 1922 | MSM_HS_DBG("%s(): calling submit_tx", __func__); |
| 1923 | msm_hs_submit_tx_locked(uport); |
| 1924 | |
| 1925 | if (uart_circ_chars_pending(tx_buf) < WAKEUP_CHARS) |
| 1926 | uart_write_wakeup(uport); |
| 1927 | |
| 1928 | spin_unlock_irqrestore(&(msm_uport->uport.lock), flags); |
| 1929 | msm_hs_resource_unvote(msm_uport); |
| 1930 | } |
| 1931 | |
| 1932 | static void |
| 1933 | msm_hs_mark_proc_rx_desc(struct msm_hs_port *msm_uport, |
| 1934 | struct sps_event_notify *notify) |
| 1935 | { |
| 1936 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1937 | phys_addr_t addr = DESC_FULL_ADDR(notify->data.transfer.iovec.flags, |
| 1938 | notify->data.transfer.iovec.addr); |
| 1939 | /* divide by UARTDM_RX_BUF_SIZE */ |
| 1940 | int inx = (addr - rx->rbuffer) >> 9; |
| 1941 | |
| 1942 | set_bit(inx, &rx->pending_flag); |
| 1943 | clear_bit(inx, &rx->queued_flag); |
| 1944 | rx->iovec[inx] = notify->data.transfer.iovec; |
| 1945 | MSM_HS_DBG("Clear Q, Set P Bit %d, Q 0x%lx P 0x%lx", |
| 1946 | inx, rx->queued_flag, rx->pending_flag); |
| 1947 | } |
| 1948 | |
| 1949 | /** |
| 1950 | * Callback notification from SPS driver |
| 1951 | * |
| 1952 | * This callback function gets triggered called from |
| 1953 | * SPS driver when requested SPS data transfer is |
| 1954 | * completed. |
| 1955 | * |
| 1956 | */ |
| 1957 | |
| 1958 | static void msm_hs_sps_rx_callback(struct sps_event_notify *notify) |
| 1959 | { |
| 1960 | |
| 1961 | struct msm_hs_port *msm_uport = |
| 1962 | (struct msm_hs_port *) |
| 1963 | ((struct sps_event_notify *)notify)->user; |
| 1964 | struct uart_port *uport; |
| 1965 | unsigned long flags; |
| 1966 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 1967 | phys_addr_t addr = DESC_FULL_ADDR(notify->data.transfer.iovec.flags, |
| 1968 | notify->data.transfer.iovec.addr); |
| 1969 | /* divide by UARTDM_RX_BUF_SIZE */ |
| 1970 | int inx = (addr - rx->rbuffer) >> 9; |
| 1971 | |
| 1972 | uport = &(msm_uport->uport); |
| 1973 | msm_uport->notify = *notify; |
| 1974 | MSM_HS_INFO("rx_cb: addr=0x%pa, size=0x%x, flags=0x%x\n", |
| 1975 | &addr, notify->data.transfer.iovec.size, |
| 1976 | notify->data.transfer.iovec.flags); |
| 1977 | |
| 1978 | spin_lock_irqsave(&uport->lock, flags); |
| 1979 | msm_hs_mark_proc_rx_desc(msm_uport, notify); |
| 1980 | spin_unlock_irqrestore(&uport->lock, flags); |
| 1981 | |
| 1982 | if (msm_uport->rx.flush == FLUSH_NONE) { |
| 1983 | /* Test if others are queued */ |
| 1984 | if (msm_uport->rx.pending_flag & ~(1 << inx)) { |
| 1985 | MSM_HS_DBG("%s(): inx 0x%x, 0x%lx not processed", |
| 1986 | __func__, inx, |
| 1987 | msm_uport->rx.pending_flag & ~(1<<inx)); |
| 1988 | } |
| 1989 | kthread_queue_work(&msm_uport->rx.kworker, |
| 1990 | &msm_uport->rx.kwork); |
| 1991 | MSM_HS_DBG("%s(): Scheduled rx_tlet", __func__); |
| 1992 | } |
| 1993 | } |
| 1994 | |
| 1995 | /* |
| 1996 | * Standard API, Current states of modem control inputs |
| 1997 | * |
| 1998 | * Since CTS can be handled entirely by HARDWARE we always |
| 1999 | * indicate clear to send and count on the TX FIFO to block when |
| 2000 | * it fills up. |
| 2001 | * |
| 2002 | * - TIOCM_DCD |
| 2003 | * - TIOCM_CTS |
| 2004 | * - TIOCM_DSR |
| 2005 | * - TIOCM_RI |
| 2006 | * (Unsupported) DCD and DSR will return them high. RI will return low. |
| 2007 | */ |
| 2008 | static unsigned int msm_hs_get_mctrl_locked(struct uart_port *uport) |
| 2009 | { |
| 2010 | return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS; |
| 2011 | } |
| 2012 | |
| 2013 | /* |
| 2014 | * Standard API, Set or clear RFR_signal |
| 2015 | * |
| 2016 | * Set RFR high, (Indicate we are not ready for data), we disable auto |
| 2017 | * ready for receiving and then set RFR_N high. To set RFR to low we just turn |
| 2018 | * back auto ready for receiving and it should lower RFR signal |
| 2019 | * when hardware is ready |
| 2020 | */ |
| 2021 | void msm_hs_set_mctrl_locked(struct uart_port *uport, |
| 2022 | unsigned int mctrl) |
| 2023 | { |
| 2024 | unsigned int set_rts; |
| 2025 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2026 | |
| 2027 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) { |
| 2028 | MSM_HS_WARN("%s(): Clocks are off\n", __func__); |
| 2029 | return; |
| 2030 | } |
| 2031 | /* RTS is active low */ |
| 2032 | set_rts = TIOCM_RTS & mctrl ? 0 : 1; |
| 2033 | MSM_HS_INFO("%s: set_rts %d\n", __func__, set_rts); |
| 2034 | |
| 2035 | if (set_rts) |
| 2036 | msm_hs_disable_flow_control(uport, false); |
| 2037 | else |
| 2038 | msm_hs_enable_flow_control(uport, false); |
| 2039 | } |
| 2040 | |
| 2041 | void msm_hs_set_mctrl(struct uart_port *uport, |
| 2042 | unsigned int mctrl) |
| 2043 | { |
| 2044 | unsigned long flags; |
| 2045 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2046 | |
| 2047 | msm_hs_resource_vote(msm_uport); |
| 2048 | spin_lock_irqsave(&uport->lock, flags); |
| 2049 | msm_hs_set_mctrl_locked(uport, mctrl); |
| 2050 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2051 | msm_hs_resource_unvote(msm_uport); |
| 2052 | } |
| 2053 | EXPORT_SYMBOL(msm_hs_set_mctrl); |
| 2054 | |
| 2055 | /* Standard API, Enable modem status (CTS) interrupt */ |
| 2056 | static void msm_hs_enable_ms_locked(struct uart_port *uport) |
| 2057 | { |
| 2058 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2059 | |
| 2060 | if (msm_uport->pm_state != MSM_HS_PM_ACTIVE) { |
| 2061 | MSM_HS_WARN("%s(): Clocks are off\n", __func__); |
| 2062 | return; |
| 2063 | } |
| 2064 | |
| 2065 | /* Enable DELTA_CTS Interrupt */ |
| 2066 | msm_uport->imr_reg |= UARTDM_ISR_DELTA_CTS_BMSK; |
| 2067 | msm_hs_write(uport, UART_DM_IMR, msm_uport->imr_reg); |
| 2068 | /* Ensure register IO completion */ |
| 2069 | mb(); |
| 2070 | |
| 2071 | } |
| 2072 | |
| 2073 | /* |
| 2074 | * Standard API, Break Signal |
| 2075 | * |
| 2076 | * Control the transmission of a break signal. ctl eq 0 => break |
| 2077 | * signal terminate ctl ne 0 => start break signal |
| 2078 | */ |
| 2079 | static void msm_hs_break_ctl(struct uart_port *uport, int ctl) |
| 2080 | { |
| 2081 | unsigned long flags; |
| 2082 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2083 | |
| 2084 | msm_hs_resource_vote(msm_uport); |
| 2085 | spin_lock_irqsave(&uport->lock, flags); |
| 2086 | msm_hs_write(uport, UART_DM_CR, ctl ? START_BREAK : STOP_BREAK); |
| 2087 | /* Ensure register IO completion */ |
| 2088 | mb(); |
| 2089 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2090 | msm_hs_resource_unvote(msm_uport); |
| 2091 | } |
| 2092 | |
| 2093 | static void msm_hs_config_port(struct uart_port *uport, int cfg_flags) |
| 2094 | { |
| 2095 | if (cfg_flags & UART_CONFIG_TYPE) |
| 2096 | uport->type = PORT_MSM; |
| 2097 | |
| 2098 | } |
| 2099 | |
| 2100 | /* Handle CTS changes (Called from interrupt handler) */ |
| 2101 | static void msm_hs_handle_delta_cts_locked(struct uart_port *uport) |
| 2102 | { |
| 2103 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2104 | |
| 2105 | msm_hs_resource_vote(msm_uport); |
| 2106 | /* clear interrupt */ |
| 2107 | msm_hs_write(uport, UART_DM_CR, RESET_CTS); |
| 2108 | /* Calling CLOCK API. Hence mb() requires here. */ |
| 2109 | mb(); |
| 2110 | uport->icount.cts++; |
| 2111 | |
| 2112 | /* clear the IOCTL TIOCMIWAIT if called */ |
| 2113 | wake_up_interruptible(&uport->state->port.delta_msr_wait); |
| 2114 | msm_hs_resource_unvote(msm_uport); |
| 2115 | } |
| 2116 | |
| 2117 | static irqreturn_t msm_hs_isr(int irq, void *dev) |
| 2118 | { |
| 2119 | unsigned long flags; |
| 2120 | unsigned int isr_status; |
| 2121 | struct msm_hs_port *msm_uport = (struct msm_hs_port *)dev; |
| 2122 | struct uart_port *uport = &msm_uport->uport; |
| 2123 | struct circ_buf *tx_buf = &uport->state->xmit; |
| 2124 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 2125 | |
| 2126 | spin_lock_irqsave(&uport->lock, flags); |
| 2127 | |
| 2128 | isr_status = msm_hs_read(uport, UART_DM_MISR); |
| 2129 | MSM_HS_INFO("%s: DM_ISR: 0x%x\n", __func__, isr_status); |
| 2130 | dump_uart_hs_registers(msm_uport); |
| 2131 | |
| 2132 | /* Uart RX starting */ |
| 2133 | if (isr_status & UARTDM_ISR_RXLEV_BMSK) { |
| 2134 | MSM_HS_DBG("%s:UARTDM_ISR_RXLEV_BMSK\n", __func__); |
| 2135 | msm_uport->imr_reg &= ~UARTDM_ISR_RXLEV_BMSK; |
| 2136 | msm_hs_write(uport, UART_DM_IMR, msm_uport->imr_reg); |
| 2137 | /* Complete device write for IMR. Hence mb() requires. */ |
| 2138 | mb(); |
| 2139 | } |
| 2140 | /* Stale rx interrupt */ |
| 2141 | if (isr_status & UARTDM_ISR_RXSTALE_BMSK) { |
| 2142 | msm_hs_write(uport, UART_DM_CR, STALE_EVENT_DISABLE); |
| 2143 | msm_hs_write(uport, UART_DM_CR, RESET_STALE_INT); |
| 2144 | /* |
| 2145 | * Complete device write before calling DMOV API. Hence |
| 2146 | * mb() requires here. |
| 2147 | */ |
| 2148 | mb(); |
| 2149 | MSM_HS_DBG("%s:Stal Interrupt\n", __func__); |
| 2150 | } |
| 2151 | /* tx ready interrupt */ |
| 2152 | if (isr_status & UARTDM_ISR_TX_READY_BMSK) { |
| 2153 | MSM_HS_DBG("%s: ISR_TX_READY Interrupt\n", __func__); |
| 2154 | /* Clear TX Ready */ |
| 2155 | msm_hs_write(uport, UART_DM_CR, CLEAR_TX_READY); |
| 2156 | |
| 2157 | /* |
| 2158 | * Complete both writes before starting new TX. |
| 2159 | * Hence mb() requires here. |
| 2160 | */ |
| 2161 | mb(); |
| 2162 | /* Complete DMA TX transactions and submit new transactions */ |
| 2163 | |
| 2164 | /* Do not update tx_buf.tail if uart_flush_buffer already |
| 2165 | * called in serial core |
| 2166 | */ |
| 2167 | if (!uart_circ_empty(tx_buf)) |
| 2168 | tx_buf->tail = (tx_buf->tail + |
| 2169 | tx->tx_count) & ~UART_XMIT_SIZE; |
| 2170 | |
| 2171 | tx->dma_in_flight = false; |
| 2172 | |
| 2173 | uport->icount.tx += tx->tx_count; |
| 2174 | |
| 2175 | if (uart_circ_chars_pending(tx_buf) < WAKEUP_CHARS) |
| 2176 | uart_write_wakeup(uport); |
| 2177 | } |
| 2178 | if (isr_status & UARTDM_ISR_TXLEV_BMSK) { |
| 2179 | /* TX FIFO is empty */ |
| 2180 | msm_uport->imr_reg &= ~UARTDM_ISR_TXLEV_BMSK; |
| 2181 | msm_hs_write(uport, UART_DM_IMR, msm_uport->imr_reg); |
| 2182 | MSM_HS_DBG("%s: TXLEV Interrupt\n", __func__); |
| 2183 | /* |
| 2184 | * Complete device write before starting clock_off request. |
| 2185 | * Hence mb() requires here. |
| 2186 | */ |
| 2187 | mb(); |
| 2188 | queue_work(msm_uport->hsuart_wq, &msm_uport->clock_off_w); |
| 2189 | } |
| 2190 | |
| 2191 | /* Change in CTS interrupt */ |
| 2192 | if (isr_status & UARTDM_ISR_DELTA_CTS_BMSK) |
| 2193 | msm_hs_handle_delta_cts_locked(uport); |
| 2194 | |
| 2195 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2196 | |
| 2197 | return IRQ_HANDLED; |
| 2198 | } |
| 2199 | |
| 2200 | /* The following two functions provide interfaces to get the underlying |
| 2201 | * port structure (struct uart_port or struct msm_hs_port) given |
| 2202 | * the port index. msm_hs_get_uart port is called by clients. |
| 2203 | * The function msm_hs_get_hs_port is for internal use |
| 2204 | */ |
| 2205 | |
| 2206 | struct uart_port *msm_hs_get_uart_port(int port_index) |
| 2207 | { |
| 2208 | struct uart_state *state = msm_hs_driver.state + port_index; |
| 2209 | |
| 2210 | /* The uart_driver structure stores the states in an array. |
| 2211 | * Thus the corresponding offset from the drv->state returns |
| 2212 | * the state for the uart_port that is requested |
| 2213 | */ |
| 2214 | if (port_index == state->uart_port->line) |
| 2215 | return state->uart_port; |
| 2216 | |
| 2217 | return NULL; |
| 2218 | } |
| 2219 | EXPORT_SYMBOL(msm_hs_get_uart_port); |
| 2220 | |
| 2221 | static struct msm_hs_port *msm_hs_get_hs_port(int port_index) |
| 2222 | { |
| 2223 | struct uart_port *uport = msm_hs_get_uart_port(port_index); |
| 2224 | |
| 2225 | if (uport) |
| 2226 | return UARTDM_TO_MSM(uport); |
| 2227 | return NULL; |
| 2228 | } |
| 2229 | |
| 2230 | void enable_wakeup_interrupt(struct msm_hs_port *msm_uport) |
| 2231 | { |
| 2232 | unsigned long flags; |
| 2233 | struct uart_port *uport = &(msm_uport->uport); |
| 2234 | |
| 2235 | if (!is_use_low_power_wakeup(msm_uport)) |
| 2236 | return; |
| 2237 | if (msm_uport->wakeup.freed) |
| 2238 | return; |
| 2239 | |
| 2240 | if (!(msm_uport->wakeup.enabled)) { |
| 2241 | spin_lock_irqsave(&uport->lock, flags); |
| 2242 | msm_uport->wakeup.ignore = 1; |
| 2243 | msm_uport->wakeup.enabled = true; |
| 2244 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2245 | disable_irq(uport->irq); |
| 2246 | enable_irq(msm_uport->wakeup.irq); |
| 2247 | } else { |
| 2248 | MSM_HS_WARN("%s:Wake up IRQ already enabled", __func__); |
| 2249 | } |
| 2250 | } |
| 2251 | |
| 2252 | void disable_wakeup_interrupt(struct msm_hs_port *msm_uport) |
| 2253 | { |
| 2254 | unsigned long flags; |
| 2255 | struct uart_port *uport = &(msm_uport->uport); |
| 2256 | |
| 2257 | if (!is_use_low_power_wakeup(msm_uport)) |
| 2258 | return; |
| 2259 | if (msm_uport->wakeup.freed) |
| 2260 | return; |
| 2261 | |
| 2262 | if (msm_uport->wakeup.enabled) { |
| 2263 | disable_irq_nosync(msm_uport->wakeup.irq); |
| 2264 | enable_irq(uport->irq); |
| 2265 | spin_lock_irqsave(&uport->lock, flags); |
| 2266 | msm_uport->wakeup.enabled = false; |
| 2267 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2268 | } else { |
| 2269 | MSM_HS_WARN("%s:Wake up IRQ already disabled", __func__); |
| 2270 | } |
| 2271 | } |
| 2272 | |
| 2273 | void msm_hs_resource_off(struct msm_hs_port *msm_uport) |
| 2274 | { |
| 2275 | struct uart_port *uport = &(msm_uport->uport); |
| 2276 | unsigned int data; |
| 2277 | |
| 2278 | MSM_HS_DBG("%s(): begin", __func__); |
| 2279 | msm_hs_disable_flow_control(uport, false); |
| 2280 | if (msm_uport->rx.flush == FLUSH_NONE) |
| 2281 | msm_hs_disconnect_rx(uport); |
| 2282 | |
| 2283 | /* disable dlink */ |
| 2284 | if (msm_uport->tx.flush == FLUSH_NONE) |
| 2285 | wait_event_timeout(msm_uport->tx.wait, |
| 2286 | msm_uport->tx.flush == FLUSH_STOP, 500); |
| 2287 | |
| 2288 | if (msm_uport->tx.flush != FLUSH_SHUTDOWN) { |
| 2289 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 2290 | data &= ~UARTDM_TX_BAM_ENABLE_BMSK; |
| 2291 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 2292 | sps_tx_disconnect(msm_uport); |
| 2293 | } |
| 2294 | if (!atomic_read(&msm_uport->client_req_state)) |
| 2295 | msm_hs_enable_flow_control(uport, false); |
| 2296 | } |
| 2297 | |
| 2298 | void msm_hs_resource_on(struct msm_hs_port *msm_uport) |
| 2299 | { |
| 2300 | struct uart_port *uport = &(msm_uport->uport); |
| 2301 | unsigned int data; |
| 2302 | unsigned long flags; |
| 2303 | |
| 2304 | if (msm_uport->rx.flush == FLUSH_SHUTDOWN || |
| 2305 | msm_uport->rx.flush == FLUSH_STOP) { |
| 2306 | msm_hs_write(uport, UART_DM_CR, RESET_RX); |
| 2307 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 2308 | data |= UARTDM_RX_BAM_ENABLE_BMSK; |
| 2309 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 2310 | } |
| 2311 | |
| 2312 | msm_hs_spsconnect_tx(msm_uport); |
| 2313 | if (msm_uport->rx.flush == FLUSH_SHUTDOWN) { |
| 2314 | msm_hs_spsconnect_rx(uport); |
| 2315 | spin_lock_irqsave(&uport->lock, flags); |
| 2316 | msm_hs_start_rx_locked(uport); |
| 2317 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2318 | } |
| 2319 | } |
| 2320 | |
| 2321 | /* Request to turn off uart clock once pending TX is flushed */ |
| 2322 | int msm_hs_request_clock_off(struct uart_port *uport) |
| 2323 | { |
| 2324 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2325 | int ret = 0; |
| 2326 | int client_count = 0; |
| 2327 | |
| 2328 | mutex_lock(&msm_uport->mtx); |
| 2329 | /* |
| 2330 | * If we're in the middle of a system suspend, don't process these |
| 2331 | * userspace/kernel API commands. |
| 2332 | */ |
| 2333 | if (msm_uport->pm_state == MSM_HS_PM_SYS_SUSPENDED) { |
| 2334 | MSM_HS_WARN("%s:Can't process clk request during suspend", |
| 2335 | __func__); |
| 2336 | ret = -EIO; |
| 2337 | } |
| 2338 | mutex_unlock(&msm_uport->mtx); |
| 2339 | if (ret) |
| 2340 | goto exit_request_clock_off; |
| 2341 | |
| 2342 | if (atomic_read(&msm_uport->client_count) <= 0) { |
| 2343 | MSM_HS_WARN("%s(): ioctl count -ve, client check voting", |
| 2344 | __func__); |
| 2345 | ret = -EPERM; |
| 2346 | goto exit_request_clock_off; |
| 2347 | } |
| 2348 | /* Set the flag to disable flow control and wakeup irq */ |
| 2349 | if (msm_uport->obs) |
| 2350 | atomic_set(&msm_uport->client_req_state, 1); |
| 2351 | msm_hs_resource_unvote(msm_uport); |
| 2352 | atomic_dec(&msm_uport->client_count); |
| 2353 | client_count = atomic_read(&msm_uport->client_count); |
| 2354 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 2355 | "%s: Client_Count %d\n", __func__, |
| 2356 | client_count); |
| 2357 | exit_request_clock_off: |
| 2358 | return ret; |
| 2359 | } |
| 2360 | EXPORT_SYMBOL(msm_hs_request_clock_off); |
| 2361 | |
| 2362 | int msm_hs_request_clock_on(struct uart_port *uport) |
| 2363 | { |
| 2364 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2365 | int client_count; |
| 2366 | int ret = 0; |
| 2367 | |
| 2368 | mutex_lock(&msm_uport->mtx); |
| 2369 | /* |
| 2370 | * If we're in the middle of a system suspend, don't process these |
| 2371 | * userspace/kernel API commands. |
| 2372 | */ |
| 2373 | if (msm_uport->pm_state == MSM_HS_PM_SYS_SUSPENDED) { |
| 2374 | MSM_HS_WARN("%s:Can't process clk request during suspend", |
| 2375 | __func__); |
| 2376 | ret = -EIO; |
| 2377 | } |
| 2378 | mutex_unlock(&msm_uport->mtx); |
| 2379 | if (ret) |
| 2380 | goto exit_request_clock_on; |
| 2381 | |
| 2382 | msm_hs_resource_vote(UARTDM_TO_MSM(uport)); |
| 2383 | atomic_inc(&msm_uport->client_count); |
| 2384 | client_count = atomic_read(&msm_uport->client_count); |
| 2385 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 2386 | "%s: Client_Count %d\n", __func__, |
| 2387 | client_count); |
| 2388 | |
| 2389 | /* Clear the flag */ |
| 2390 | if (msm_uport->obs) |
| 2391 | atomic_set(&msm_uport->client_req_state, 0); |
| 2392 | exit_request_clock_on: |
| 2393 | return ret; |
| 2394 | } |
| 2395 | EXPORT_SYMBOL(msm_hs_request_clock_on); |
| 2396 | |
| 2397 | static irqreturn_t msm_hs_wakeup_isr(int irq, void *dev) |
| 2398 | { |
| 2399 | unsigned int wakeup = 0; |
| 2400 | unsigned long flags; |
| 2401 | struct msm_hs_port *msm_uport = (struct msm_hs_port *)dev; |
| 2402 | struct uart_port *uport = &msm_uport->uport; |
| 2403 | struct tty_struct *tty = NULL; |
| 2404 | |
| 2405 | spin_lock_irqsave(&uport->lock, flags); |
| 2406 | |
| 2407 | if (msm_uport->wakeup.ignore) |
| 2408 | msm_uport->wakeup.ignore = 0; |
| 2409 | else |
| 2410 | wakeup = 1; |
| 2411 | |
| 2412 | if (wakeup) { |
| 2413 | /* |
| 2414 | * Port was clocked off during rx, wake up and |
| 2415 | * optionally inject char into tty rx |
| 2416 | */ |
| 2417 | if (msm_uport->wakeup.inject_rx) { |
| 2418 | tty = uport->state->port.tty; |
| 2419 | tty_insert_flip_char(tty->port, |
| 2420 | msm_uport->wakeup.rx_to_inject, |
| 2421 | TTY_NORMAL); |
| 2422 | hex_dump_ipc(msm_uport, msm_uport->rx.ipc_rx_ctxt, |
| 2423 | "Rx Inject", |
| 2424 | &msm_uport->wakeup.rx_to_inject, 0, 1); |
| 2425 | MSM_HS_INFO("Wakeup ISR.Ignore%d\n", |
| 2426 | msm_uport->wakeup.ignore); |
| 2427 | } |
| 2428 | } |
| 2429 | |
| 2430 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2431 | |
| 2432 | if (wakeup && msm_uport->wakeup.inject_rx) |
| 2433 | tty_flip_buffer_push(tty->port); |
| 2434 | return IRQ_HANDLED; |
| 2435 | } |
| 2436 | |
| 2437 | static const char *msm_hs_type(struct uart_port *port) |
| 2438 | { |
| 2439 | return "MSM HS UART"; |
| 2440 | } |
| 2441 | |
| 2442 | /** |
| 2443 | * msm_hs_unconfig_uart_gpios: Unconfigures UART GPIOs |
| 2444 | * @uport: uart port |
| 2445 | */ |
| 2446 | static void msm_hs_unconfig_uart_gpios(struct uart_port *uport) |
| 2447 | { |
| 2448 | struct platform_device *pdev = to_platform_device(uport->dev); |
| 2449 | const struct msm_serial_hs_platform_data *pdata = |
| 2450 | pdev->dev.platform_data; |
| 2451 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2452 | int ret; |
| 2453 | |
| 2454 | if (msm_uport->use_pinctrl) { |
| 2455 | ret = pinctrl_select_state(msm_uport->pinctrl, |
| 2456 | msm_uport->gpio_state_suspend); |
| 2457 | if (ret) |
| 2458 | MSM_HS_ERR("%s():Failed to pinctrl set_state", |
| 2459 | __func__); |
| 2460 | } else if (pdata) { |
| 2461 | if (gpio_is_valid(pdata->uart_tx_gpio)) |
| 2462 | gpio_free(pdata->uart_tx_gpio); |
| 2463 | if (gpio_is_valid(pdata->uart_rx_gpio)) |
| 2464 | gpio_free(pdata->uart_rx_gpio); |
| 2465 | if (gpio_is_valid(pdata->uart_cts_gpio)) |
| 2466 | gpio_free(pdata->uart_cts_gpio); |
| 2467 | if (gpio_is_valid(pdata->uart_rfr_gpio)) |
| 2468 | gpio_free(pdata->uart_rfr_gpio); |
| 2469 | } else |
| 2470 | MSM_HS_ERR("Error:Pdata is NULL.\n"); |
| 2471 | } |
| 2472 | |
| 2473 | /** |
| 2474 | * msm_hs_config_uart_gpios - Configures UART GPIOs |
| 2475 | * @uport: uart port |
| 2476 | */ |
| 2477 | static int msm_hs_config_uart_gpios(struct uart_port *uport) |
| 2478 | { |
| 2479 | struct platform_device *pdev = to_platform_device(uport->dev); |
| 2480 | const struct msm_serial_hs_platform_data *pdata = |
| 2481 | pdev->dev.platform_data; |
| 2482 | int ret = 0; |
| 2483 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2484 | |
| 2485 | if (!IS_ERR_OR_NULL(msm_uport->pinctrl)) { |
| 2486 | MSM_HS_DBG("%s(): Using Pinctrl", __func__); |
| 2487 | msm_uport->use_pinctrl = true; |
| 2488 | ret = pinctrl_select_state(msm_uport->pinctrl, |
| 2489 | msm_uport->gpio_state_active); |
| 2490 | if (ret) |
| 2491 | MSM_HS_ERR("%s(): Failed to pinctrl set_state", |
| 2492 | __func__); |
| 2493 | return ret; |
| 2494 | } else if (pdata) { |
| 2495 | /* Fall back to using gpio lib */ |
| 2496 | if (gpio_is_valid(pdata->uart_tx_gpio)) { |
| 2497 | ret = gpio_request(pdata->uart_tx_gpio, |
| 2498 | "UART_TX_GPIO"); |
| 2499 | if (unlikely(ret)) { |
| 2500 | MSM_HS_ERR("gpio request failed for:%d\n", |
| 2501 | pdata->uart_tx_gpio); |
| 2502 | goto exit_uart_config; |
| 2503 | } |
| 2504 | } |
| 2505 | |
| 2506 | if (gpio_is_valid(pdata->uart_rx_gpio)) { |
| 2507 | ret = gpio_request(pdata->uart_rx_gpio, |
| 2508 | "UART_RX_GPIO"); |
| 2509 | if (unlikely(ret)) { |
| 2510 | MSM_HS_ERR("gpio request failed for:%d\n", |
| 2511 | pdata->uart_rx_gpio); |
| 2512 | goto uart_tx_unconfig; |
| 2513 | } |
| 2514 | } |
| 2515 | |
| 2516 | if (gpio_is_valid(pdata->uart_cts_gpio)) { |
| 2517 | ret = gpio_request(pdata->uart_cts_gpio, |
| 2518 | "UART_CTS_GPIO"); |
| 2519 | if (unlikely(ret)) { |
| 2520 | MSM_HS_ERR("gpio request failed for:%d\n", |
| 2521 | pdata->uart_cts_gpio); |
| 2522 | goto uart_rx_unconfig; |
| 2523 | } |
| 2524 | } |
| 2525 | |
| 2526 | if (gpio_is_valid(pdata->uart_rfr_gpio)) { |
| 2527 | ret = gpio_request(pdata->uart_rfr_gpio, |
| 2528 | "UART_RFR_GPIO"); |
| 2529 | if (unlikely(ret)) { |
| 2530 | MSM_HS_ERR("gpio request failed for:%d\n", |
| 2531 | pdata->uart_rfr_gpio); |
| 2532 | goto uart_cts_unconfig; |
| 2533 | } |
| 2534 | } |
| 2535 | } else { |
| 2536 | MSM_HS_ERR("Pdata is NULL.\n"); |
| 2537 | ret = -EINVAL; |
| 2538 | } |
| 2539 | return ret; |
| 2540 | |
| 2541 | uart_cts_unconfig: |
| 2542 | if (gpio_is_valid(pdata->uart_cts_gpio)) |
| 2543 | gpio_free(pdata->uart_cts_gpio); |
| 2544 | uart_rx_unconfig: |
| 2545 | if (gpio_is_valid(pdata->uart_rx_gpio)) |
| 2546 | gpio_free(pdata->uart_rx_gpio); |
| 2547 | uart_tx_unconfig: |
| 2548 | if (gpio_is_valid(pdata->uart_tx_gpio)) |
| 2549 | gpio_free(pdata->uart_tx_gpio); |
| 2550 | exit_uart_config: |
| 2551 | return ret; |
| 2552 | } |
| 2553 | |
| 2554 | |
| 2555 | static void msm_hs_get_pinctrl_configs(struct uart_port *uport) |
| 2556 | { |
| 2557 | struct pinctrl_state *set_state; |
| 2558 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2559 | |
| 2560 | msm_uport->pinctrl = devm_pinctrl_get(uport->dev); |
| 2561 | if (IS_ERR_OR_NULL(msm_uport->pinctrl)) { |
| 2562 | MSM_HS_DBG("%s(): Pinctrl not defined", __func__); |
| 2563 | } else { |
| 2564 | MSM_HS_DBG("%s(): Using Pinctrl", __func__); |
| 2565 | msm_uport->use_pinctrl = true; |
| 2566 | |
| 2567 | set_state = pinctrl_lookup_state(msm_uport->pinctrl, |
| 2568 | PINCTRL_STATE_DEFAULT); |
| 2569 | if (IS_ERR_OR_NULL(set_state)) { |
| 2570 | dev_err(uport->dev, |
| 2571 | "pinctrl lookup failed for default state"); |
| 2572 | goto pinctrl_fail; |
| 2573 | } |
| 2574 | |
| 2575 | MSM_HS_DBG("%s(): Pinctrl state active %p\n", __func__, |
| 2576 | set_state); |
| 2577 | msm_uport->gpio_state_active = set_state; |
| 2578 | |
| 2579 | set_state = pinctrl_lookup_state(msm_uport->pinctrl, |
| 2580 | PINCTRL_STATE_SLEEP); |
| 2581 | if (IS_ERR_OR_NULL(set_state)) { |
| 2582 | dev_err(uport->dev, |
| 2583 | "pinctrl lookup failed for sleep state"); |
| 2584 | goto pinctrl_fail; |
| 2585 | } |
| 2586 | |
| 2587 | MSM_HS_DBG("%s(): Pinctrl state sleep %p\n", __func__, |
| 2588 | set_state); |
| 2589 | msm_uport->gpio_state_suspend = set_state; |
| 2590 | return; |
| 2591 | } |
| 2592 | pinctrl_fail: |
| 2593 | msm_uport->pinctrl = NULL; |
| 2594 | } |
| 2595 | |
| 2596 | /* Called when port is opened */ |
| 2597 | static int msm_hs_startup(struct uart_port *uport) |
| 2598 | { |
| 2599 | int ret; |
| 2600 | int rfr_level; |
| 2601 | unsigned long flags; |
| 2602 | unsigned int data; |
| 2603 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2604 | struct circ_buf *tx_buf = &uport->state->xmit; |
| 2605 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 2606 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 2607 | struct sps_pipe *sps_pipe_handle_tx = tx->cons.pipe_handle; |
| 2608 | struct sps_pipe *sps_pipe_handle_rx = rx->prod.pipe_handle; |
| 2609 | |
| 2610 | rfr_level = uport->fifosize; |
| 2611 | if (rfr_level > 16) |
| 2612 | rfr_level -= 16; |
| 2613 | |
| 2614 | tx->dma_base = dma_map_single(uport->dev, tx_buf->buf, UART_XMIT_SIZE, |
| 2615 | DMA_TO_DEVICE); |
| 2616 | |
| 2617 | /* turn on uart clk */ |
| 2618 | msm_hs_resource_vote(msm_uport); |
| 2619 | |
Mukesh Kumar Savaliya | 8fa1c82 | 2018-03-27 00:00:35 +0530 | [diff] [blame^] | 2620 | /* Set up Uart Receive */ |
| 2621 | msm_hs_write(uport, UART_DM_RFWR, 32); |
| 2622 | /* Write to BADR explicitly to set up FIFO sizes */ |
| 2623 | msm_hs_write(uport, UARTDM_BADR_ADDR, 64); |
| 2624 | |
| 2625 | /* configure the CR Protection to Enable */ |
| 2626 | msm_hs_write(uport, UART_DM_CR, CR_PROTECTION_EN); |
| 2627 | |
| 2628 | /* |
| 2629 | * Enable Command register protection before going ahead as this hw |
| 2630 | * configuration makes sure that issued cmd to CR register gets complete |
| 2631 | * before next issued cmd start. Hence mb() requires here. |
| 2632 | */ |
| 2633 | mb(); |
| 2634 | |
| 2635 | /* |
| 2636 | * Set RX_BREAK_ZERO_CHAR_OFF and RX_ERROR_CHAR_OFF |
| 2637 | * so any rx_break and character having parity of framing |
| 2638 | * error don't enter inside UART RX FIFO. |
| 2639 | */ |
| 2640 | data = msm_hs_read(uport, UART_DM_MR2); |
| 2641 | data |= (UARTDM_MR2_RX_BREAK_ZERO_CHAR_OFF | |
| 2642 | UARTDM_MR2_RX_ERROR_CHAR_OFF); |
| 2643 | msm_hs_write(uport, UART_DM_MR2, data); |
| 2644 | /* Ensure register IO completion */ |
| 2645 | mb(); |
| 2646 | |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 2647 | if (is_use_low_power_wakeup(msm_uport)) { |
| 2648 | ret = request_threaded_irq(msm_uport->wakeup.irq, NULL, |
| 2649 | msm_hs_wakeup_isr, |
| 2650 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 2651 | "msm_hs_wakeup", msm_uport); |
| 2652 | if (unlikely(ret)) { |
| 2653 | MSM_HS_ERR("%s():Err getting uart wakeup_irq %d\n", |
| 2654 | __func__, ret); |
| 2655 | goto unvote_exit; |
| 2656 | } |
| 2657 | |
| 2658 | msm_uport->wakeup.freed = false; |
| 2659 | disable_irq(msm_uport->wakeup.irq); |
| 2660 | msm_uport->wakeup.enabled = false; |
| 2661 | |
| 2662 | ret = irq_set_irq_wake(msm_uport->wakeup.irq, 1); |
| 2663 | if (unlikely(ret)) { |
| 2664 | MSM_HS_ERR("%s():Err setting wakeup irq\n", __func__); |
| 2665 | goto free_uart_irq; |
| 2666 | } |
| 2667 | } |
| 2668 | |
| 2669 | ret = msm_hs_config_uart_gpios(uport); |
| 2670 | if (ret) { |
| 2671 | MSM_HS_ERR("Uart GPIO request failed\n"); |
| 2672 | goto free_uart_irq; |
| 2673 | } |
| 2674 | |
| 2675 | msm_hs_write(uport, UART_DM_DMEN, 0); |
| 2676 | |
| 2677 | /* Connect TX */ |
| 2678 | sps_tx_disconnect(msm_uport); |
| 2679 | ret = msm_hs_spsconnect_tx(msm_uport); |
| 2680 | if (ret) { |
| 2681 | MSM_HS_ERR("msm_serial_hs: SPS connect failed for TX"); |
| 2682 | goto unconfig_uart_gpios; |
| 2683 | } |
| 2684 | |
| 2685 | /* Connect RX */ |
| 2686 | kthread_flush_worker(&msm_uport->rx.kworker); |
| 2687 | if (rx->flush != FLUSH_SHUTDOWN) |
| 2688 | disconnect_rx_endpoint(msm_uport); |
| 2689 | ret = msm_hs_spsconnect_rx(uport); |
| 2690 | if (ret) { |
| 2691 | MSM_HS_ERR("msm_serial_hs: SPS connect failed for RX"); |
| 2692 | goto sps_disconnect_tx; |
| 2693 | } |
| 2694 | |
| 2695 | data = (UARTDM_BCR_TX_BREAK_DISABLE | UARTDM_BCR_STALE_IRQ_EMPTY | |
| 2696 | UARTDM_BCR_RX_DMRX_LOW_EN | UARTDM_BCR_RX_STAL_IRQ_DMRX_EQL | |
| 2697 | UARTDM_BCR_RX_DMRX_1BYTE_RES_EN); |
| 2698 | msm_hs_write(uport, UART_DM_BCR, data); |
| 2699 | |
| 2700 | /* Set auto RFR Level */ |
| 2701 | data = msm_hs_read(uport, UART_DM_MR1); |
| 2702 | data &= ~UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK; |
| 2703 | data &= ~UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK; |
| 2704 | data |= (UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK & (rfr_level << 2)); |
| 2705 | data |= (UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK & rfr_level); |
| 2706 | msm_hs_write(uport, UART_DM_MR1, data); |
| 2707 | |
| 2708 | /* Make sure RXSTALE count is non-zero */ |
| 2709 | data = msm_hs_read(uport, UART_DM_IPR); |
| 2710 | if (!data) { |
| 2711 | data |= 0x1f & UARTDM_IPR_STALE_LSB_BMSK; |
| 2712 | msm_hs_write(uport, UART_DM_IPR, data); |
| 2713 | } |
| 2714 | |
| 2715 | /* Assume no flow control, unless termios sets it */ |
| 2716 | msm_uport->flow_control = false; |
| 2717 | msm_hs_disable_flow_control(uport, true); |
| 2718 | |
| 2719 | |
| 2720 | /* Reset TX */ |
| 2721 | msm_hs_write(uport, UART_DM_CR, RESET_TX); |
| 2722 | msm_hs_write(uport, UART_DM_CR, RESET_RX); |
| 2723 | msm_hs_write(uport, UART_DM_CR, RESET_ERROR_STATUS); |
| 2724 | msm_hs_write(uport, UART_DM_CR, RESET_BREAK_INT); |
| 2725 | msm_hs_write(uport, UART_DM_CR, RESET_STALE_INT); |
| 2726 | msm_hs_write(uport, UART_DM_CR, RESET_CTS); |
| 2727 | msm_hs_write(uport, UART_DM_CR, RFR_LOW); |
| 2728 | /* Turn on Uart Receiver */ |
| 2729 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_RX_EN_BMSK); |
| 2730 | |
| 2731 | /* Turn on Uart Transmitter */ |
| 2732 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_TX_EN_BMSK); |
| 2733 | |
| 2734 | tx->dma_in_flight = false; |
| 2735 | MSM_HS_DBG("%s():desc usage flag 0x%lx", __func__, rx->queued_flag); |
| 2736 | setup_timer(&(tx->tx_timeout_timer), |
| 2737 | tx_timeout_handler, |
| 2738 | (unsigned long) msm_uport); |
| 2739 | |
| 2740 | /* Enable reading the current CTS, no harm even if CTS is ignored */ |
| 2741 | msm_uport->imr_reg |= UARTDM_ISR_CURRENT_CTS_BMSK; |
| 2742 | |
| 2743 | /* TXLEV on empty TX fifo */ |
| 2744 | msm_hs_write(uport, UART_DM_TFWR, 4); |
| 2745 | /* |
| 2746 | * Complete all device write related configuration before |
| 2747 | * queuing RX request. Hence mb() requires here. |
| 2748 | */ |
| 2749 | mb(); |
| 2750 | |
| 2751 | ret = request_irq(uport->irq, msm_hs_isr, IRQF_TRIGGER_HIGH, |
| 2752 | "msm_hs_uart", msm_uport); |
| 2753 | if (unlikely(ret)) { |
| 2754 | MSM_HS_ERR("%s():Error %d getting uart irq\n", __func__, ret); |
| 2755 | goto sps_disconnect_rx; |
| 2756 | } |
| 2757 | |
| 2758 | |
| 2759 | spin_lock_irqsave(&uport->lock, flags); |
| 2760 | atomic_set(&msm_uport->client_count, 0); |
| 2761 | atomic_set(&msm_uport->client_req_state, 0); |
| 2762 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 2763 | "%s: Client_Count 0\n", __func__); |
| 2764 | msm_hs_start_rx_locked(uport); |
| 2765 | |
| 2766 | spin_unlock_irqrestore(&uport->lock, flags); |
| 2767 | |
| 2768 | msm_hs_resource_unvote(msm_uport); |
| 2769 | return 0; |
| 2770 | |
| 2771 | sps_disconnect_rx: |
| 2772 | sps_disconnect(sps_pipe_handle_rx); |
| 2773 | sps_disconnect_tx: |
| 2774 | sps_disconnect(sps_pipe_handle_tx); |
| 2775 | unconfig_uart_gpios: |
| 2776 | msm_hs_unconfig_uart_gpios(uport); |
| 2777 | free_uart_irq: |
| 2778 | free_irq(uport->irq, msm_uport); |
| 2779 | unvote_exit: |
| 2780 | msm_hs_resource_unvote(msm_uport); |
| 2781 | MSM_HS_ERR("%s(): Error return\n", __func__); |
| 2782 | return ret; |
| 2783 | } |
| 2784 | |
| 2785 | /* Initialize tx and rx data structures */ |
| 2786 | static int uartdm_init_port(struct uart_port *uport) |
| 2787 | { |
| 2788 | int ret = 0; |
| 2789 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 2790 | struct msm_hs_tx *tx = &msm_uport->tx; |
| 2791 | struct msm_hs_rx *rx = &msm_uport->rx; |
| 2792 | |
| 2793 | init_waitqueue_head(&rx->wait); |
| 2794 | init_waitqueue_head(&tx->wait); |
| 2795 | init_waitqueue_head(&msm_uport->bam_disconnect_wait); |
| 2796 | |
| 2797 | /* Init kernel threads for tx and rx */ |
| 2798 | |
| 2799 | kthread_init_worker(&rx->kworker); |
| 2800 | rx->task = kthread_run(kthread_worker_fn, |
| 2801 | &rx->kworker, "msm_serial_hs_%d_rx_work", uport->line); |
| 2802 | if (IS_ERR(rx->task)) { |
| 2803 | MSM_HS_ERR("%s(): error creating task", __func__); |
| 2804 | goto exit_lh_init; |
| 2805 | } |
| 2806 | kthread_init_work(&rx->kwork, msm_serial_hs_rx_work); |
| 2807 | |
| 2808 | kthread_init_worker(&tx->kworker); |
| 2809 | tx->task = kthread_run(kthread_worker_fn, |
| 2810 | &tx->kworker, "msm_serial_hs_%d_tx_work", uport->line); |
| 2811 | if (IS_ERR(rx->task)) { |
| 2812 | MSM_HS_ERR("%s(): error creating task", __func__); |
| 2813 | goto exit_lh_init; |
| 2814 | } |
| 2815 | |
| 2816 | kthread_init_work(&tx->kwork, msm_serial_hs_tx_work); |
| 2817 | |
| 2818 | rx->buffer = dma_alloc_coherent(uport->dev, |
| 2819 | UART_DMA_DESC_NR * UARTDM_RX_BUF_SIZE, |
| 2820 | &rx->rbuffer, GFP_KERNEL); |
| 2821 | if (!rx->buffer) { |
| 2822 | MSM_HS_ERR("%s(): cannot allocate rx->buffer", __func__); |
| 2823 | ret = -ENOMEM; |
| 2824 | goto exit_lh_init; |
| 2825 | } |
| 2826 | |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 2827 | |
| 2828 | INIT_DELAYED_WORK(&rx->flip_insert_work, flip_insert_work); |
| 2829 | |
| 2830 | return ret; |
| 2831 | exit_lh_init: |
| 2832 | kthread_stop(rx->task); |
| 2833 | rx->task = NULL; |
| 2834 | kthread_stop(tx->task); |
| 2835 | tx->task = NULL; |
| 2836 | return ret; |
| 2837 | } |
| 2838 | |
| 2839 | struct msm_serial_hs_platform_data |
| 2840 | *msm_hs_dt_to_pdata(struct platform_device *pdev) |
| 2841 | { |
| 2842 | struct device_node *node = pdev->dev.of_node; |
| 2843 | struct msm_serial_hs_platform_data *pdata; |
| 2844 | u32 rx_to_inject; |
| 2845 | int ret; |
| 2846 | |
| 2847 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| 2848 | if (!pdata) |
| 2849 | return ERR_PTR(-ENOMEM); |
| 2850 | |
| 2851 | pdev->id = of_alias_get_id(pdev->dev.of_node, "uart"); |
| 2852 | /* UART TX GPIO */ |
| 2853 | pdata->uart_tx_gpio = of_get_named_gpio(node, |
| 2854 | "qcom,tx-gpio", 0); |
| 2855 | if (pdata->uart_tx_gpio < 0) |
| 2856 | pr_err("uart_tx_gpio is not available\n"); |
| 2857 | |
| 2858 | /* UART RX GPIO */ |
| 2859 | pdata->uart_rx_gpio = of_get_named_gpio(node, |
| 2860 | "qcom,rx-gpio", 0); |
| 2861 | if (pdata->uart_rx_gpio < 0) |
| 2862 | pr_err("uart_rx_gpio is not available\n"); |
| 2863 | |
| 2864 | /* UART CTS GPIO */ |
| 2865 | pdata->uart_cts_gpio = of_get_named_gpio(node, |
| 2866 | "qcom,cts-gpio", 0); |
| 2867 | if (pdata->uart_cts_gpio < 0) |
| 2868 | pr_err("uart_cts_gpio is not available\n"); |
| 2869 | |
| 2870 | /* UART RFR GPIO */ |
| 2871 | pdata->uart_rfr_gpio = of_get_named_gpio(node, |
| 2872 | "qcom,rfr-gpio", 0); |
| 2873 | if (pdata->uart_rfr_gpio < 0) |
| 2874 | pr_err("uart_rfr_gpio is not available\n"); |
| 2875 | |
| 2876 | pdata->no_suspend_delay = of_property_read_bool(node, |
| 2877 | "qcom,no-suspend-delay"); |
| 2878 | |
| 2879 | pdata->obs = of_property_read_bool(node, |
| 2880 | "qcom,msm-obs"); |
| 2881 | if (pdata->obs) |
| 2882 | pr_err("%s:Out of Band sleep flag is set\n", __func__); |
| 2883 | |
| 2884 | pdata->inject_rx_on_wakeup = of_property_read_bool(node, |
| 2885 | "qcom,inject-rx-on-wakeup"); |
| 2886 | |
| 2887 | if (pdata->inject_rx_on_wakeup) { |
| 2888 | ret = of_property_read_u32(node, "qcom,rx-char-to-inject", |
| 2889 | &rx_to_inject); |
| 2890 | if (ret < 0) { |
| 2891 | pr_err("Error: Rx_char_to_inject not specified.\n"); |
| 2892 | return ERR_PTR(ret); |
| 2893 | } |
| 2894 | pdata->rx_to_inject = (u8)rx_to_inject; |
| 2895 | } |
| 2896 | |
| 2897 | ret = of_property_read_u32(node, "qcom,bam-tx-ep-pipe-index", |
| 2898 | &pdata->bam_tx_ep_pipe_index); |
| 2899 | if (ret < 0) { |
| 2900 | pr_err("Error: Getting UART BAM TX EP Pipe Index.\n"); |
| 2901 | return ERR_PTR(ret); |
| 2902 | } |
| 2903 | |
| 2904 | if (!(pdata->bam_tx_ep_pipe_index >= BAM_PIPE_MIN && |
| 2905 | pdata->bam_tx_ep_pipe_index <= BAM_PIPE_MAX)) { |
| 2906 | pr_err("Error: Invalid UART BAM TX EP Pipe Index.\n"); |
| 2907 | return ERR_PTR(-EINVAL); |
| 2908 | } |
| 2909 | |
| 2910 | ret = of_property_read_u32(node, "qcom,bam-rx-ep-pipe-index", |
| 2911 | &pdata->bam_rx_ep_pipe_index); |
| 2912 | if (ret < 0) { |
| 2913 | pr_err("Error: Getting UART BAM RX EP Pipe Index.\n"); |
| 2914 | return ERR_PTR(ret); |
| 2915 | } |
| 2916 | |
| 2917 | if (!(pdata->bam_rx_ep_pipe_index >= BAM_PIPE_MIN && |
| 2918 | pdata->bam_rx_ep_pipe_index <= BAM_PIPE_MAX)) { |
| 2919 | pr_err("Error: Invalid UART BAM RX EP Pipe Index.\n"); |
| 2920 | return ERR_PTR(-EINVAL); |
| 2921 | } |
| 2922 | |
| 2923 | pr_debug("tx_ep_pipe_index:%d rx_ep_pipe_index:%d\n" |
| 2924 | "tx_gpio:%d rx_gpio:%d rfr_gpio:%d cts_gpio:%d", |
| 2925 | pdata->bam_tx_ep_pipe_index, pdata->bam_rx_ep_pipe_index, |
| 2926 | pdata->uart_tx_gpio, pdata->uart_rx_gpio, pdata->uart_cts_gpio, |
| 2927 | pdata->uart_rfr_gpio); |
| 2928 | |
| 2929 | return pdata; |
| 2930 | } |
| 2931 | |
| 2932 | |
| 2933 | /** |
| 2934 | * Deallocate UART peripheral's SPS endpoint |
| 2935 | * @msm_uport - Pointer to msm_hs_port structure |
| 2936 | * @ep - Pointer to sps endpoint data structure |
| 2937 | */ |
| 2938 | |
| 2939 | static void msm_hs_exit_ep_conn(struct msm_hs_port *msm_uport, |
| 2940 | struct msm_hs_sps_ep_conn_data *ep) |
| 2941 | { |
| 2942 | struct sps_pipe *sps_pipe_handle = ep->pipe_handle; |
| 2943 | struct sps_connect *sps_config = &ep->config; |
| 2944 | |
| 2945 | dma_free_coherent(msm_uport->uport.dev, |
| 2946 | sps_config->desc.size, |
| 2947 | &sps_config->desc.phys_base, |
| 2948 | GFP_KERNEL); |
| 2949 | sps_free_endpoint(sps_pipe_handle); |
| 2950 | } |
| 2951 | |
| 2952 | |
| 2953 | /** |
| 2954 | * Allocate UART peripheral's SPS endpoint |
| 2955 | * |
| 2956 | * This function allocates endpoint context |
| 2957 | * by calling appropriate SPS driver APIs. |
| 2958 | * |
| 2959 | * @msm_uport - Pointer to msm_hs_port structure |
| 2960 | * @ep - Pointer to sps endpoint data structure |
| 2961 | * @is_produce - 1 means Producer endpoint |
| 2962 | * - 0 means Consumer endpoint |
| 2963 | * |
| 2964 | * @return - 0 if successful else negative value |
| 2965 | */ |
| 2966 | |
| 2967 | static int msm_hs_sps_init_ep_conn(struct msm_hs_port *msm_uport, |
| 2968 | struct msm_hs_sps_ep_conn_data *ep, |
| 2969 | bool is_producer) |
| 2970 | { |
| 2971 | int rc = 0; |
| 2972 | struct sps_pipe *sps_pipe_handle; |
| 2973 | struct sps_connect *sps_config = &ep->config; |
| 2974 | struct sps_register_event *sps_event = &ep->event; |
| 2975 | |
| 2976 | /* Allocate endpoint context */ |
| 2977 | sps_pipe_handle = sps_alloc_endpoint(); |
| 2978 | if (!sps_pipe_handle) { |
| 2979 | MSM_HS_ERR("%s(): sps_alloc_endpoint() failed!!\n" |
| 2980 | "is_producer=%d", __func__, is_producer); |
| 2981 | rc = -ENOMEM; |
| 2982 | goto out; |
| 2983 | } |
| 2984 | |
| 2985 | /* Get default connection configuration for an endpoint */ |
| 2986 | rc = sps_get_config(sps_pipe_handle, sps_config); |
| 2987 | if (rc) { |
| 2988 | MSM_HS_ERR("%s(): failed! pipe_handle=0x%p rc=%d", |
| 2989 | __func__, sps_pipe_handle, rc); |
| 2990 | goto get_config_err; |
| 2991 | } |
| 2992 | |
| 2993 | /* Modify the default connection configuration */ |
| 2994 | if (is_producer) { |
| 2995 | /* For UART producer transfer, source is UART peripheral |
| 2996 | * where as destination is system memory |
| 2997 | */ |
| 2998 | sps_config->source = msm_uport->bam_handle; |
| 2999 | sps_config->destination = SPS_DEV_HANDLE_MEM; |
| 3000 | sps_config->mode = SPS_MODE_SRC; |
| 3001 | sps_config->src_pipe_index = msm_uport->bam_rx_ep_pipe_index; |
| 3002 | sps_config->dest_pipe_index = 0; |
| 3003 | sps_event->callback = msm_hs_sps_rx_callback; |
| 3004 | } else { |
| 3005 | /* For UART consumer transfer, source is system memory |
| 3006 | * where as destination is UART peripheral |
| 3007 | */ |
| 3008 | sps_config->source = SPS_DEV_HANDLE_MEM; |
| 3009 | sps_config->destination = msm_uport->bam_handle; |
| 3010 | sps_config->mode = SPS_MODE_DEST; |
| 3011 | sps_config->src_pipe_index = 0; |
| 3012 | sps_config->dest_pipe_index = msm_uport->bam_tx_ep_pipe_index; |
| 3013 | sps_event->callback = msm_hs_sps_tx_callback; |
| 3014 | } |
| 3015 | |
| 3016 | sps_config->options = SPS_O_EOT | SPS_O_DESC_DONE | SPS_O_AUTO_ENABLE; |
| 3017 | sps_config->event_thresh = 0x10; |
| 3018 | |
| 3019 | /* Allocate maximum descriptor fifo size */ |
| 3020 | sps_config->desc.size = |
| 3021 | (1 + UART_DMA_DESC_NR) * sizeof(struct sps_iovec); |
| 3022 | sps_config->desc.base = dma_alloc_coherent(msm_uport->uport.dev, |
| 3023 | sps_config->desc.size, |
| 3024 | &sps_config->desc.phys_base, |
| 3025 | GFP_KERNEL); |
| 3026 | if (!sps_config->desc.base) { |
| 3027 | rc = -ENOMEM; |
| 3028 | MSM_HS_ERR("msm_serial_hs: dma_alloc_coherent() failed!!\n"); |
| 3029 | goto get_config_err; |
| 3030 | } |
| 3031 | memset(sps_config->desc.base, 0x00, sps_config->desc.size); |
| 3032 | |
| 3033 | sps_event->mode = SPS_TRIGGER_CALLBACK; |
| 3034 | |
| 3035 | sps_event->options = SPS_O_DESC_DONE | SPS_O_EOT; |
| 3036 | sps_event->user = (void *)msm_uport; |
| 3037 | |
| 3038 | /* Now save the sps pipe handle */ |
| 3039 | ep->pipe_handle = sps_pipe_handle; |
| 3040 | MSM_HS_DBG("msm_serial_hs: success !! %s: pipe_handle=0x%p\n" |
| 3041 | "desc_fifo.phys_base=0x%pa\n", |
| 3042 | is_producer ? "READ" : "WRITE", |
| 3043 | sps_pipe_handle, &sps_config->desc.phys_base); |
| 3044 | return 0; |
| 3045 | |
| 3046 | get_config_err: |
| 3047 | sps_free_endpoint(sps_pipe_handle); |
| 3048 | out: |
| 3049 | return rc; |
| 3050 | } |
| 3051 | |
| 3052 | /** |
| 3053 | * Initialize SPS HW connected with UART core |
| 3054 | * |
| 3055 | * This function register BAM HW resources with |
| 3056 | * SPS driver and then initialize 2 SPS endpoints |
| 3057 | * |
| 3058 | * msm_uport - Pointer to msm_hs_port structure |
| 3059 | * |
| 3060 | * @return - 0 if successful else negative value |
| 3061 | */ |
| 3062 | |
| 3063 | static int msm_hs_sps_init(struct msm_hs_port *msm_uport) |
| 3064 | { |
| 3065 | int rc = 0; |
| 3066 | struct sps_bam_props bam = {0}; |
| 3067 | unsigned long bam_handle; |
| 3068 | |
| 3069 | rc = sps_phy2h(msm_uport->bam_mem, &bam_handle); |
| 3070 | if (rc || !bam_handle) { |
| 3071 | bam.phys_addr = msm_uport->bam_mem; |
| 3072 | bam.virt_addr = msm_uport->bam_base; |
| 3073 | /* |
| 3074 | * This event thresold value is only significant for BAM-to-BAM |
| 3075 | * transfer. It's ignored for BAM-to-System mode transfer. |
| 3076 | */ |
| 3077 | bam.event_threshold = 0x10; /* Pipe event threshold */ |
| 3078 | bam.summing_threshold = 1; /* BAM event threshold */ |
| 3079 | |
| 3080 | /* SPS driver wll handle the UART BAM IRQ */ |
| 3081 | bam.irq = (u32)msm_uport->bam_irq; |
| 3082 | bam.manage = SPS_BAM_MGR_DEVICE_REMOTE; |
| 3083 | |
| 3084 | MSM_HS_DBG("msm_serial_hs: bam physical base=0x%pa\n", |
| 3085 | &bam.phys_addr); |
| 3086 | MSM_HS_DBG("msm_serial_hs: bam virtual base=0x%p\n", |
| 3087 | bam.virt_addr); |
| 3088 | |
| 3089 | /* Register UART Peripheral BAM device to SPS driver */ |
| 3090 | rc = sps_register_bam_device(&bam, &bam_handle); |
| 3091 | if (rc) { |
| 3092 | MSM_HS_ERR("%s: BAM device register failed\n", |
| 3093 | __func__); |
| 3094 | return rc; |
| 3095 | } |
| 3096 | MSM_HS_DBG("%s:BAM device registered. bam_handle=0x%lx", |
| 3097 | __func__, msm_uport->bam_handle); |
| 3098 | } |
| 3099 | msm_uport->bam_handle = bam_handle; |
| 3100 | |
| 3101 | rc = msm_hs_sps_init_ep_conn(msm_uport, &msm_uport->rx.prod, |
| 3102 | UART_SPS_PROD_PERIPHERAL); |
| 3103 | if (rc) { |
| 3104 | MSM_HS_ERR("%s: Failed to Init Producer BAM-pipe", __func__); |
| 3105 | goto deregister_bam; |
| 3106 | } |
| 3107 | |
| 3108 | rc = msm_hs_sps_init_ep_conn(msm_uport, &msm_uport->tx.cons, |
| 3109 | UART_SPS_CONS_PERIPHERAL); |
| 3110 | if (rc) { |
| 3111 | MSM_HS_ERR("%s: Failed to Init Consumer BAM-pipe", __func__); |
| 3112 | goto deinit_ep_conn_prod; |
| 3113 | } |
| 3114 | return 0; |
| 3115 | |
| 3116 | deinit_ep_conn_prod: |
| 3117 | msm_hs_exit_ep_conn(msm_uport, &msm_uport->rx.prod); |
| 3118 | deregister_bam: |
| 3119 | sps_deregister_bam_device(msm_uport->bam_handle); |
| 3120 | return rc; |
| 3121 | } |
| 3122 | |
| 3123 | |
| 3124 | static bool deviceid[UARTDM_NR] = {0}; |
| 3125 | /* |
| 3126 | * The mutex synchronizes grabbing next free device number |
| 3127 | * both in case of an alias being used or not. When alias is |
| 3128 | * used, the msm_hs_dt_to_pdata gets it and the boolean array |
| 3129 | * is accordingly updated with device_id_set_used. If no alias |
| 3130 | * is used, then device_id_grab_next_free sets that array. |
| 3131 | */ |
| 3132 | static DEFINE_MUTEX(mutex_next_device_id); |
| 3133 | |
| 3134 | static int device_id_grab_next_free(void) |
| 3135 | { |
| 3136 | int i; |
| 3137 | int ret = -ENODEV; |
| 3138 | |
| 3139 | mutex_lock(&mutex_next_device_id); |
| 3140 | for (i = 0; i < UARTDM_NR; i++) |
| 3141 | if (!deviceid[i]) { |
| 3142 | ret = i; |
| 3143 | deviceid[i] = true; |
| 3144 | break; |
| 3145 | } |
| 3146 | mutex_unlock(&mutex_next_device_id); |
| 3147 | return ret; |
| 3148 | } |
| 3149 | |
| 3150 | static int device_id_set_used(int index) |
| 3151 | { |
| 3152 | int ret = 0; |
| 3153 | |
| 3154 | mutex_lock(&mutex_next_device_id); |
| 3155 | if (deviceid[index]) |
| 3156 | ret = -ENODEV; |
| 3157 | else |
| 3158 | deviceid[index] = true; |
| 3159 | mutex_unlock(&mutex_next_device_id); |
| 3160 | return ret; |
| 3161 | } |
| 3162 | |
| 3163 | static void obs_manage_irq(struct msm_hs_port *msm_uport, bool en) |
| 3164 | { |
| 3165 | struct uart_port *uport = &(msm_uport->uport); |
| 3166 | |
| 3167 | if (msm_uport->obs) { |
| 3168 | if (en) |
| 3169 | enable_irq(uport->irq); |
| 3170 | else |
| 3171 | disable_irq(uport->irq); |
| 3172 | } |
| 3173 | } |
| 3174 | |
| 3175 | static void msm_hs_pm_suspend(struct device *dev) |
| 3176 | { |
| 3177 | struct platform_device *pdev = to_platform_device(dev); |
| 3178 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 3179 | int ret; |
| 3180 | int client_count = 0; |
| 3181 | |
| 3182 | if (!msm_uport) |
| 3183 | goto err_suspend; |
| 3184 | mutex_lock(&msm_uport->mtx); |
| 3185 | |
| 3186 | client_count = atomic_read(&msm_uport->client_count); |
| 3187 | msm_uport->pm_state = MSM_HS_PM_SUSPENDED; |
| 3188 | msm_hs_resource_off(msm_uport); |
| 3189 | obs_manage_irq(msm_uport, false); |
| 3190 | msm_hs_clk_bus_unvote(msm_uport); |
| 3191 | |
| 3192 | /* For OBS, don't use wakeup interrupt, set gpio to suspended state */ |
| 3193 | if (msm_uport->obs) { |
| 3194 | ret = pinctrl_select_state(msm_uport->pinctrl, |
| 3195 | msm_uport->gpio_state_suspend); |
| 3196 | if (ret) |
| 3197 | MSM_HS_ERR("%s():Error selecting pinctrl suspend state", |
| 3198 | __func__); |
| 3199 | } |
| 3200 | |
| 3201 | if (!atomic_read(&msm_uport->client_req_state)) |
| 3202 | enable_wakeup_interrupt(msm_uport); |
| 3203 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 3204 | "%s: PM State Suspended client_count %d\n", __func__, |
| 3205 | client_count); |
| 3206 | mutex_unlock(&msm_uport->mtx); |
| 3207 | return; |
| 3208 | err_suspend: |
| 3209 | pr_err("%s(): invalid uport", __func__); |
| 3210 | } |
| 3211 | |
| 3212 | static int msm_hs_pm_resume(struct device *dev) |
| 3213 | { |
| 3214 | struct platform_device *pdev = to_platform_device(dev); |
| 3215 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 3216 | int ret = 0; |
| 3217 | int client_count = 0; |
| 3218 | |
| 3219 | if (!msm_uport) { |
| 3220 | dev_err(dev, "%s:Invalid uport\n", __func__); |
| 3221 | return -ENODEV; |
| 3222 | } |
| 3223 | |
| 3224 | mutex_lock(&msm_uport->mtx); |
| 3225 | client_count = atomic_read(&msm_uport->client_count); |
| 3226 | if (msm_uport->pm_state == MSM_HS_PM_ACTIVE) |
| 3227 | goto exit_pm_resume; |
| 3228 | if (!atomic_read(&msm_uport->client_req_state)) |
| 3229 | disable_wakeup_interrupt(msm_uport); |
| 3230 | |
| 3231 | /* For OBS, don't use wakeup interrupt, set gpio to active state */ |
| 3232 | if (msm_uport->obs) { |
| 3233 | ret = pinctrl_select_state(msm_uport->pinctrl, |
| 3234 | msm_uport->gpio_state_active); |
| 3235 | if (ret) |
| 3236 | MSM_HS_ERR("%s():Error selecting active state", |
| 3237 | __func__); |
| 3238 | } |
| 3239 | |
| 3240 | ret = msm_hs_clk_bus_vote(msm_uport); |
| 3241 | if (ret) { |
| 3242 | MSM_HS_ERR("%s:Failed clock vote %d\n", __func__, ret); |
| 3243 | dev_err(dev, "%s:Failed clock vote %d\n", __func__, ret); |
| 3244 | goto exit_pm_resume; |
| 3245 | } |
| 3246 | obs_manage_irq(msm_uport, true); |
| 3247 | msm_uport->pm_state = MSM_HS_PM_ACTIVE; |
| 3248 | msm_hs_resource_on(msm_uport); |
| 3249 | |
| 3250 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 3251 | "%s:PM State:Active client_count %d\n", __func__, client_count); |
| 3252 | exit_pm_resume: |
| 3253 | mutex_unlock(&msm_uport->mtx); |
| 3254 | return ret; |
| 3255 | } |
| 3256 | |
| 3257 | #ifdef CONFIG_PM |
| 3258 | static int msm_hs_pm_sys_suspend_noirq(struct device *dev) |
| 3259 | { |
| 3260 | struct platform_device *pdev = to_platform_device(dev); |
| 3261 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 3262 | enum msm_hs_pm_state prev_pwr_state; |
| 3263 | int clk_cnt, client_count, ret = 0; |
| 3264 | |
| 3265 | if (IS_ERR_OR_NULL(msm_uport)) |
| 3266 | return -ENODEV; |
| 3267 | |
| 3268 | mutex_lock(&msm_uport->mtx); |
| 3269 | |
| 3270 | /* |
| 3271 | * If there is an active clk request or an impending userspace request |
| 3272 | * fail the suspend callback. |
| 3273 | */ |
| 3274 | clk_cnt = atomic_read(&msm_uport->resource_count); |
| 3275 | client_count = atomic_read(&msm_uport->client_count); |
| 3276 | if (msm_uport->pm_state == MSM_HS_PM_ACTIVE) { |
| 3277 | MSM_HS_WARN("%s:Fail Suspend.clk_cnt:%d,clnt_count:%d\n", |
| 3278 | __func__, clk_cnt, client_count); |
| 3279 | ret = -EBUSY; |
| 3280 | goto exit_suspend_noirq; |
| 3281 | } |
| 3282 | |
| 3283 | prev_pwr_state = msm_uport->pm_state; |
| 3284 | msm_uport->pm_state = MSM_HS_PM_SYS_SUSPENDED; |
| 3285 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 3286 | "%s:PM State:Sys-Suspended client_count %d\n", __func__, |
| 3287 | client_count); |
| 3288 | exit_suspend_noirq: |
| 3289 | mutex_unlock(&msm_uport->mtx); |
| 3290 | return ret; |
| 3291 | }; |
| 3292 | |
| 3293 | static int msm_hs_pm_sys_resume_noirq(struct device *dev) |
| 3294 | { |
| 3295 | struct platform_device *pdev = to_platform_device(dev); |
| 3296 | struct msm_hs_port *msm_uport = get_matching_hs_port(pdev); |
| 3297 | |
| 3298 | if (IS_ERR_OR_NULL(msm_uport)) |
| 3299 | return -ENODEV; |
| 3300 | /* |
| 3301 | * Note system-pm resume and update the state |
| 3302 | * variable. Resource activation will be done |
| 3303 | * when transfer is requested. |
| 3304 | */ |
| 3305 | |
| 3306 | mutex_lock(&msm_uport->mtx); |
| 3307 | if (msm_uport->pm_state == MSM_HS_PM_SYS_SUSPENDED) |
| 3308 | msm_uport->pm_state = MSM_HS_PM_SUSPENDED; |
| 3309 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 3310 | "%s:PM State: Suspended\n", __func__); |
| 3311 | mutex_unlock(&msm_uport->mtx); |
| 3312 | return 0; |
| 3313 | } |
| 3314 | #endif |
| 3315 | |
| 3316 | #ifdef CONFIG_PM |
| 3317 | static void msm_serial_hs_rt_init(struct uart_port *uport) |
| 3318 | { |
| 3319 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 3320 | |
| 3321 | MSM_HS_INFO("%s(): Enabling runtime pm", __func__); |
| 3322 | pm_runtime_set_suspended(uport->dev); |
| 3323 | pm_runtime_set_autosuspend_delay(uport->dev, 100); |
| 3324 | pm_runtime_use_autosuspend(uport->dev); |
| 3325 | mutex_lock(&msm_uport->mtx); |
| 3326 | msm_uport->pm_state = MSM_HS_PM_SUSPENDED; |
| 3327 | mutex_unlock(&msm_uport->mtx); |
| 3328 | pm_runtime_enable(uport->dev); |
| 3329 | } |
| 3330 | |
| 3331 | static int msm_hs_runtime_suspend(struct device *dev) |
| 3332 | { |
| 3333 | msm_hs_pm_suspend(dev); |
| 3334 | return 0; |
| 3335 | } |
| 3336 | |
| 3337 | static int msm_hs_runtime_resume(struct device *dev) |
| 3338 | { |
| 3339 | return msm_hs_pm_resume(dev); |
| 3340 | } |
| 3341 | #else |
| 3342 | static void msm_serial_hs_rt_init(struct uart_port *uport) {} |
| 3343 | static int msm_hs_runtime_suspend(struct device *dev) {} |
| 3344 | static int msm_hs_runtime_resume(struct device *dev) {} |
| 3345 | #endif |
| 3346 | |
| 3347 | |
| 3348 | static int msm_hs_probe(struct platform_device *pdev) |
| 3349 | { |
| 3350 | int ret = 0; |
| 3351 | struct uart_port *uport; |
| 3352 | struct msm_hs_port *msm_uport; |
| 3353 | struct resource *core_resource; |
| 3354 | struct resource *bam_resource; |
| 3355 | int core_irqres, bam_irqres, wakeup_irqres; |
| 3356 | struct msm_serial_hs_platform_data *pdata = pdev->dev.platform_data; |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 3357 | char name[30]; |
| 3358 | |
| 3359 | if (pdev->dev.of_node) { |
| 3360 | dev_dbg(&pdev->dev, "device tree enabled\n"); |
| 3361 | pdata = msm_hs_dt_to_pdata(pdev); |
| 3362 | if (IS_ERR(pdata)) |
| 3363 | return PTR_ERR(pdata); |
| 3364 | |
| 3365 | if (pdev->id < 0) { |
| 3366 | pdev->id = device_id_grab_next_free(); |
| 3367 | if (pdev->id < 0) { |
| 3368 | dev_err(&pdev->dev, |
| 3369 | "Error grabbing next free device id"); |
| 3370 | return pdev->id; |
| 3371 | } |
| 3372 | } else { |
| 3373 | ret = device_id_set_used(pdev->id); |
| 3374 | if (ret < 0) { |
| 3375 | dev_err(&pdev->dev, "%d alias taken", |
| 3376 | pdev->id); |
| 3377 | return ret; |
| 3378 | } |
| 3379 | } |
| 3380 | pdev->dev.platform_data = pdata; |
| 3381 | } |
| 3382 | |
| 3383 | if (pdev->id < 0 || pdev->id >= UARTDM_NR) { |
| 3384 | dev_err(&pdev->dev, "Invalid plaform device ID = %d\n", |
| 3385 | pdev->id); |
| 3386 | return -EINVAL; |
| 3387 | } |
| 3388 | |
| 3389 | msm_uport = devm_kzalloc(&pdev->dev, sizeof(struct msm_hs_port), |
| 3390 | GFP_KERNEL); |
| 3391 | if (!msm_uport) |
| 3392 | return -ENOMEM; |
| 3393 | |
| 3394 | msm_uport->uport.type = PORT_UNKNOWN; |
| 3395 | uport = &msm_uport->uport; |
| 3396 | uport->dev = &pdev->dev; |
| 3397 | |
| 3398 | if (pdev->dev.of_node) |
| 3399 | msm_uport->uart_type = BLSP_HSUART; |
| 3400 | |
| 3401 | msm_hs_get_pinctrl_configs(uport); |
| 3402 | /* Get required resources for BAM HSUART */ |
| 3403 | core_resource = platform_get_resource_byname(pdev, |
| 3404 | IORESOURCE_MEM, "core_mem"); |
| 3405 | if (!core_resource) { |
| 3406 | dev_err(&pdev->dev, "Invalid core HSUART Resources.\n"); |
| 3407 | return -ENXIO; |
| 3408 | } |
| 3409 | bam_resource = platform_get_resource_byname(pdev, |
| 3410 | IORESOURCE_MEM, "bam_mem"); |
| 3411 | if (!bam_resource) { |
| 3412 | dev_err(&pdev->dev, "Invalid BAM HSUART Resources.\n"); |
| 3413 | return -ENXIO; |
| 3414 | } |
| 3415 | core_irqres = platform_get_irq_byname(pdev, "core_irq"); |
| 3416 | if (core_irqres < 0) { |
| 3417 | dev_err(&pdev->dev, "Error %d, invalid core irq resources.\n", |
| 3418 | core_irqres); |
| 3419 | return -ENXIO; |
| 3420 | } |
| 3421 | bam_irqres = platform_get_irq_byname(pdev, "bam_irq"); |
| 3422 | if (bam_irqres < 0) { |
| 3423 | dev_err(&pdev->dev, "Error %d, invalid bam irq resources.\n", |
| 3424 | bam_irqres); |
| 3425 | return -ENXIO; |
| 3426 | } |
| 3427 | wakeup_irqres = platform_get_irq_byname(pdev, "wakeup_irq"); |
| 3428 | if (wakeup_irqres < 0) { |
| 3429 | wakeup_irqres = -1; |
| 3430 | pr_info("Wakeup irq not specified.\n"); |
| 3431 | } |
| 3432 | |
| 3433 | uport->mapbase = core_resource->start; |
| 3434 | |
| 3435 | uport->membase = ioremap(uport->mapbase, |
| 3436 | resource_size(core_resource)); |
| 3437 | if (unlikely(!uport->membase)) { |
| 3438 | dev_err(&pdev->dev, "UART Resource ioremap Failed.\n"); |
| 3439 | return -ENOMEM; |
| 3440 | } |
| 3441 | msm_uport->bam_mem = bam_resource->start; |
| 3442 | msm_uport->bam_base = ioremap(msm_uport->bam_mem, |
| 3443 | resource_size(bam_resource)); |
| 3444 | if (unlikely(!msm_uport->bam_base)) { |
| 3445 | dev_err(&pdev->dev, "UART BAM Resource ioremap Failed.\n"); |
| 3446 | iounmap(uport->membase); |
| 3447 | return -ENOMEM; |
| 3448 | } |
| 3449 | |
| 3450 | memset(name, 0, sizeof(name)); |
| 3451 | scnprintf(name, sizeof(name), "%s%s", dev_name(msm_uport->uport.dev), |
| 3452 | "_state"); |
| 3453 | msm_uport->ipc_msm_hs_log_ctxt = |
| 3454 | ipc_log_context_create(IPC_MSM_HS_LOG_STATE_PAGES, |
| 3455 | name, 0); |
| 3456 | if (!msm_uport->ipc_msm_hs_log_ctxt) { |
| 3457 | dev_err(&pdev->dev, "%s: error creating logging context", |
| 3458 | __func__); |
| 3459 | } else { |
| 3460 | msm_uport->ipc_debug_mask = INFO_LEV; |
| 3461 | ret = sysfs_create_file(&pdev->dev.kobj, |
| 3462 | &dev_attr_debug_mask.attr); |
| 3463 | if (unlikely(ret)) |
| 3464 | MSM_HS_WARN("%s: Failed to create dev. attr", __func__); |
| 3465 | } |
| 3466 | |
| 3467 | uport->irq = core_irqres; |
| 3468 | msm_uport->bam_irq = bam_irqres; |
| 3469 | pdata->wakeup_irq = wakeup_irqres; |
| 3470 | |
| 3471 | msm_uport->bus_scale_table = msm_bus_cl_get_pdata(pdev); |
| 3472 | if (!msm_uport->bus_scale_table) { |
| 3473 | MSM_HS_ERR("BLSP UART: Bus scaling is disabled.\n"); |
| 3474 | } else { |
| 3475 | msm_uport->bus_perf_client = |
| 3476 | msm_bus_scale_register_client |
| 3477 | (msm_uport->bus_scale_table); |
| 3478 | if (IS_ERR(&msm_uport->bus_perf_client)) { |
| 3479 | MSM_HS_ERR("%s():Bus client register failed\n", |
| 3480 | __func__); |
| 3481 | ret = -EINVAL; |
| 3482 | goto unmap_memory; |
| 3483 | } |
| 3484 | } |
| 3485 | |
| 3486 | msm_uport->wakeup.irq = pdata->wakeup_irq; |
| 3487 | msm_uport->wakeup.ignore = 1; |
| 3488 | msm_uport->wakeup.inject_rx = pdata->inject_rx_on_wakeup; |
| 3489 | msm_uport->wakeup.rx_to_inject = pdata->rx_to_inject; |
| 3490 | msm_uport->obs = pdata->obs; |
| 3491 | |
| 3492 | msm_uport->bam_tx_ep_pipe_index = |
| 3493 | pdata->bam_tx_ep_pipe_index; |
| 3494 | msm_uport->bam_rx_ep_pipe_index = |
| 3495 | pdata->bam_rx_ep_pipe_index; |
| 3496 | msm_uport->wakeup.enabled = true; |
| 3497 | |
| 3498 | uport->iotype = UPIO_MEM; |
| 3499 | uport->fifosize = 64; |
| 3500 | uport->ops = &msm_hs_ops; |
| 3501 | uport->flags = UPF_BOOT_AUTOCONF; |
| 3502 | uport->uartclk = 7372800; |
| 3503 | msm_uport->imr_reg = 0x0; |
| 3504 | |
| 3505 | msm_uport->clk = clk_get(&pdev->dev, "core_clk"); |
| 3506 | if (IS_ERR(msm_uport->clk)) { |
| 3507 | ret = PTR_ERR(msm_uport->clk); |
| 3508 | goto deregister_bus_client; |
| 3509 | } |
| 3510 | |
| 3511 | msm_uport->pclk = clk_get(&pdev->dev, "iface_clk"); |
| 3512 | /* |
| 3513 | * Some configurations do not require explicit pclk control so |
| 3514 | * do not flag error on pclk get failure. |
| 3515 | */ |
| 3516 | if (IS_ERR(msm_uport->pclk)) |
| 3517 | msm_uport->pclk = NULL; |
| 3518 | |
| 3519 | msm_uport->hsuart_wq = alloc_workqueue("k_hsuart", |
| 3520 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); |
| 3521 | if (!msm_uport->hsuart_wq) { |
| 3522 | MSM_HS_ERR("%s(): Unable to create workqueue hsuart_wq\n", |
| 3523 | __func__); |
| 3524 | ret = -ENOMEM; |
| 3525 | goto put_clk; |
| 3526 | } |
| 3527 | |
| 3528 | mutex_init(&msm_uport->mtx); |
| 3529 | |
| 3530 | /* Initialize SPS HW connected with UART core */ |
| 3531 | ret = msm_hs_sps_init(msm_uport); |
| 3532 | if (unlikely(ret)) { |
| 3533 | MSM_HS_ERR("SPS Initialization failed ! err=%d", ret); |
| 3534 | goto destroy_mutex; |
| 3535 | } |
| 3536 | |
| 3537 | msm_uport->tx.flush = FLUSH_SHUTDOWN; |
| 3538 | msm_uport->rx.flush = FLUSH_SHUTDOWN; |
| 3539 | |
| 3540 | memset(name, 0, sizeof(name)); |
| 3541 | scnprintf(name, sizeof(name), "%s%s", dev_name(msm_uport->uport.dev), |
| 3542 | "_tx"); |
| 3543 | msm_uport->tx.ipc_tx_ctxt = |
| 3544 | ipc_log_context_create(IPC_MSM_HS_LOG_DATA_PAGES, name, 0); |
| 3545 | if (!msm_uport->tx.ipc_tx_ctxt) |
| 3546 | dev_err(&pdev->dev, "%s: error creating tx logging context", |
| 3547 | __func__); |
| 3548 | |
| 3549 | memset(name, 0, sizeof(name)); |
| 3550 | scnprintf(name, sizeof(name), "%s%s", dev_name(msm_uport->uport.dev), |
| 3551 | "_rx"); |
| 3552 | msm_uport->rx.ipc_rx_ctxt = ipc_log_context_create( |
| 3553 | IPC_MSM_HS_LOG_DATA_PAGES, name, 0); |
| 3554 | if (!msm_uport->rx.ipc_rx_ctxt) |
| 3555 | dev_err(&pdev->dev, "%s: error creating rx logging context", |
| 3556 | __func__); |
| 3557 | |
| 3558 | memset(name, 0, sizeof(name)); |
| 3559 | scnprintf(name, sizeof(name), "%s%s", dev_name(msm_uport->uport.dev), |
| 3560 | "_pwr"); |
| 3561 | msm_uport->ipc_msm_hs_pwr_ctxt = ipc_log_context_create( |
| 3562 | IPC_MSM_HS_LOG_USER_PAGES, name, 0); |
| 3563 | if (!msm_uport->ipc_msm_hs_pwr_ctxt) |
| 3564 | dev_err(&pdev->dev, "%s: error creating usr logging context", |
| 3565 | __func__); |
| 3566 | |
| 3567 | uport->irq = core_irqres; |
| 3568 | msm_uport->bam_irq = bam_irqres; |
| 3569 | |
| 3570 | clk_set_rate(msm_uport->clk, msm_uport->uport.uartclk); |
| 3571 | msm_hs_clk_bus_vote(msm_uport); |
| 3572 | ret = uartdm_init_port(uport); |
| 3573 | if (unlikely(ret)) |
| 3574 | goto err_clock; |
| 3575 | |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 3576 | |
| 3577 | ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_clock.attr); |
| 3578 | if (unlikely(ret)) { |
| 3579 | MSM_HS_ERR("Probe Failed as sysfs failed\n"); |
| 3580 | goto err_clock; |
| 3581 | } |
| 3582 | |
| 3583 | msm_serial_debugfs_init(msm_uport, pdev->id); |
| 3584 | msm_hs_unconfig_uart_gpios(uport); |
| 3585 | |
| 3586 | uport->line = pdev->id; |
| 3587 | if (pdata->userid && pdata->userid <= UARTDM_NR) |
| 3588 | uport->line = pdata->userid; |
| 3589 | ret = uart_add_one_port(&msm_hs_driver, uport); |
| 3590 | if (!ret) { |
| 3591 | msm_hs_clk_bus_unvote(msm_uport); |
| 3592 | msm_serial_hs_rt_init(uport); |
| 3593 | return ret; |
| 3594 | } |
| 3595 | |
| 3596 | err_clock: |
| 3597 | msm_hs_clk_bus_unvote(msm_uport); |
| 3598 | |
| 3599 | destroy_mutex: |
| 3600 | mutex_destroy(&msm_uport->mtx); |
| 3601 | destroy_workqueue(msm_uport->hsuart_wq); |
| 3602 | |
| 3603 | put_clk: |
| 3604 | if (msm_uport->pclk) |
| 3605 | clk_put(msm_uport->pclk); |
| 3606 | |
| 3607 | if (msm_uport->clk) |
| 3608 | clk_put(msm_uport->clk); |
| 3609 | |
| 3610 | deregister_bus_client: |
| 3611 | msm_bus_scale_unregister_client(msm_uport->bus_perf_client); |
| 3612 | unmap_memory: |
| 3613 | iounmap(uport->membase); |
| 3614 | iounmap(msm_uport->bam_base); |
| 3615 | |
| 3616 | return ret; |
| 3617 | } |
| 3618 | |
| 3619 | static int __init msm_serial_hs_init(void) |
| 3620 | { |
| 3621 | int ret; |
| 3622 | |
| 3623 | ret = uart_register_driver(&msm_hs_driver); |
| 3624 | if (unlikely(ret)) { |
| 3625 | pr_err("%s failed to load\n", __func__); |
| 3626 | return ret; |
| 3627 | } |
| 3628 | debug_base = debugfs_create_dir("msm_serial_hs", NULL); |
| 3629 | if (IS_ERR_OR_NULL(debug_base)) |
| 3630 | pr_err("msm_serial_hs: Cannot create debugfs dir\n"); |
| 3631 | |
| 3632 | ret = platform_driver_register(&msm_serial_hs_platform_driver); |
| 3633 | if (ret) { |
| 3634 | pr_err("%s failed to load\n", __func__); |
| 3635 | debugfs_remove_recursive(debug_base); |
| 3636 | uart_unregister_driver(&msm_hs_driver); |
| 3637 | return ret; |
| 3638 | } |
| 3639 | |
| 3640 | pr_info("msm_serial_hs module loaded\n"); |
| 3641 | return ret; |
| 3642 | } |
| 3643 | |
| 3644 | /* |
| 3645 | * Called by the upper layer when port is closed. |
| 3646 | * - Disables the port |
| 3647 | * - Unhook the ISR |
| 3648 | */ |
| 3649 | static void msm_hs_shutdown(struct uart_port *uport) |
| 3650 | { |
| 3651 | int ret, rc; |
| 3652 | struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); |
| 3653 | struct circ_buf *tx_buf = &uport->state->xmit; |
| 3654 | int data; |
| 3655 | unsigned long flags; |
| 3656 | |
| 3657 | if (is_use_low_power_wakeup(msm_uport)) |
| 3658 | irq_set_irq_wake(msm_uport->wakeup.irq, 0); |
| 3659 | |
| 3660 | if (msm_uport->wakeup.enabled) |
| 3661 | disable_irq(msm_uport->wakeup.irq); |
| 3662 | else |
| 3663 | disable_irq(uport->irq); |
| 3664 | |
| 3665 | spin_lock_irqsave(&uport->lock, flags); |
| 3666 | msm_uport->wakeup.enabled = false; |
| 3667 | msm_uport->wakeup.ignore = 1; |
| 3668 | spin_unlock_irqrestore(&uport->lock, flags); |
| 3669 | |
| 3670 | /* Free the interrupt */ |
| 3671 | free_irq(uport->irq, msm_uport); |
| 3672 | if (is_use_low_power_wakeup(msm_uport)) { |
| 3673 | free_irq(msm_uport->wakeup.irq, msm_uport); |
| 3674 | MSM_HS_DBG("%s(): wakeup irq freed", __func__); |
| 3675 | } |
| 3676 | msm_uport->wakeup.freed = true; |
| 3677 | |
| 3678 | /* make sure tx lh finishes */ |
| 3679 | kthread_flush_worker(&msm_uport->tx.kworker); |
| 3680 | ret = wait_event_timeout(msm_uport->tx.wait, |
| 3681 | uart_circ_empty(tx_buf), 500); |
| 3682 | if (!ret) |
| 3683 | MSM_HS_WARN("Shutdown called when tx buff not empty"); |
| 3684 | |
| 3685 | msm_hs_resource_vote(msm_uport); |
| 3686 | /* Stop remote side from sending data */ |
| 3687 | msm_hs_disable_flow_control(uport, false); |
| 3688 | /* make sure rx lh finishes */ |
| 3689 | kthread_flush_worker(&msm_uport->rx.kworker); |
| 3690 | |
| 3691 | if (msm_uport->rx.flush != FLUSH_SHUTDOWN) { |
| 3692 | /* disable and disconnect rx */ |
| 3693 | ret = wait_event_timeout(msm_uport->rx.wait, |
| 3694 | !msm_uport->rx.pending_flag, 500); |
| 3695 | if (!ret) |
| 3696 | MSM_HS_WARN("%s(): rx disconnect not complete", |
| 3697 | __func__); |
| 3698 | msm_hs_disconnect_rx(uport); |
| 3699 | } |
| 3700 | |
| 3701 | cancel_delayed_work_sync(&msm_uport->rx.flip_insert_work); |
| 3702 | flush_workqueue(msm_uport->hsuart_wq); |
| 3703 | |
| 3704 | /* BAM Disconnect for TX */ |
| 3705 | data = msm_hs_read(uport, UART_DM_DMEN); |
| 3706 | data &= ~UARTDM_TX_BAM_ENABLE_BMSK; |
| 3707 | msm_hs_write(uport, UART_DM_DMEN, data); |
| 3708 | ret = sps_tx_disconnect(msm_uport); |
| 3709 | if (ret) |
| 3710 | MSM_HS_ERR("%s(): sps_disconnect failed\n", |
| 3711 | __func__); |
| 3712 | msm_uport->tx.flush = FLUSH_SHUTDOWN; |
| 3713 | /* Disable the transmitter */ |
| 3714 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_TX_DISABLE_BMSK); |
| 3715 | /* Disable the receiver */ |
| 3716 | msm_hs_write(uport, UART_DM_CR, UARTDM_CR_RX_DISABLE_BMSK); |
| 3717 | |
| 3718 | msm_uport->imr_reg = 0; |
| 3719 | msm_hs_write(uport, UART_DM_IMR, msm_uport->imr_reg); |
| 3720 | /* |
| 3721 | * Complete all device write before actually disabling uartclk. |
| 3722 | * Hence mb() requires here. |
| 3723 | */ |
| 3724 | mb(); |
| 3725 | |
| 3726 | msm_uport->rx.buffer_pending = NONE_PENDING; |
| 3727 | MSM_HS_DBG("%s(): tx, rx events complete", __func__); |
| 3728 | |
| 3729 | dma_unmap_single(uport->dev, msm_uport->tx.dma_base, |
| 3730 | UART_XMIT_SIZE, DMA_TO_DEVICE); |
| 3731 | |
| 3732 | msm_hs_resource_unvote(msm_uport); |
| 3733 | rc = atomic_read(&msm_uport->resource_count); |
| 3734 | if (rc) { |
| 3735 | atomic_set(&msm_uport->resource_count, 1); |
| 3736 | MSM_HS_WARN("%s(): removing extra vote\n", __func__); |
| 3737 | msm_hs_resource_unvote(msm_uport); |
| 3738 | } |
| 3739 | if (atomic_read(&msm_uport->client_req_state)) { |
| 3740 | MSM_HS_WARN("%s: Client clock vote imbalance\n", __func__); |
| 3741 | atomic_set(&msm_uport->client_req_state, 0); |
| 3742 | } |
| 3743 | if (atomic_read(&msm_uport->client_count)) { |
| 3744 | MSM_HS_WARN("%s: Client vote on, forcing to 0\n", __func__); |
| 3745 | atomic_set(&msm_uport->client_count, 0); |
| 3746 | LOG_USR_MSG(msm_uport->ipc_msm_hs_pwr_ctxt, |
| 3747 | "%s: Client_Count 0\n", __func__); |
| 3748 | } |
| 3749 | msm_hs_unconfig_uart_gpios(uport); |
| 3750 | MSM_HS_INFO("%s:UART port closed successfully\n", __func__); |
| 3751 | } |
| 3752 | |
| 3753 | static void __exit msm_serial_hs_exit(void) |
| 3754 | { |
| 3755 | pr_info("msm_serial_hs module removed\n"); |
| 3756 | debugfs_remove_recursive(debug_base); |
| 3757 | platform_driver_unregister(&msm_serial_hs_platform_driver); |
| 3758 | uart_unregister_driver(&msm_hs_driver); |
| 3759 | } |
| 3760 | |
| 3761 | static const struct dev_pm_ops msm_hs_dev_pm_ops = { |
| 3762 | .runtime_suspend = msm_hs_runtime_suspend, |
| 3763 | .runtime_resume = msm_hs_runtime_resume, |
| 3764 | .runtime_idle = NULL, |
Mukesh Kumar Savaliya | 8fa1c82 | 2018-03-27 00:00:35 +0530 | [diff] [blame^] | 3765 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(msm_hs_pm_sys_suspend_noirq, |
| 3766 | msm_hs_pm_sys_resume_noirq) |
Mukesh Kumar Savaliya | 4305aad | 2017-09-03 02:09:07 +0530 | [diff] [blame] | 3767 | }; |
| 3768 | |
| 3769 | static struct platform_driver msm_serial_hs_platform_driver = { |
| 3770 | .probe = msm_hs_probe, |
| 3771 | .remove = msm_hs_remove, |
| 3772 | .driver = { |
| 3773 | .name = "msm_serial_hs", |
| 3774 | .pm = &msm_hs_dev_pm_ops, |
| 3775 | .of_match_table = msm_hs_match_table, |
| 3776 | }, |
| 3777 | }; |
| 3778 | |
| 3779 | static struct uart_driver msm_hs_driver = { |
| 3780 | .owner = THIS_MODULE, |
| 3781 | .driver_name = "msm_serial_hs", |
| 3782 | .dev_name = "ttyHS", |
| 3783 | .nr = UARTDM_NR, |
| 3784 | .cons = 0, |
| 3785 | }; |
| 3786 | |
| 3787 | static const struct uart_ops msm_hs_ops = { |
| 3788 | .tx_empty = msm_hs_tx_empty, |
| 3789 | .set_mctrl = msm_hs_set_mctrl_locked, |
| 3790 | .get_mctrl = msm_hs_get_mctrl_locked, |
| 3791 | .stop_tx = msm_hs_stop_tx_locked, |
| 3792 | .start_tx = msm_hs_start_tx_locked, |
| 3793 | .stop_rx = msm_hs_stop_rx_locked, |
| 3794 | .enable_ms = msm_hs_enable_ms_locked, |
| 3795 | .break_ctl = msm_hs_break_ctl, |
| 3796 | .startup = msm_hs_startup, |
| 3797 | .shutdown = msm_hs_shutdown, |
| 3798 | .set_termios = msm_hs_set_termios, |
| 3799 | .type = msm_hs_type, |
| 3800 | .config_port = msm_hs_config_port, |
| 3801 | .flush_buffer = NULL, |
| 3802 | .ioctl = msm_hs_ioctl, |
| 3803 | }; |
| 3804 | |
| 3805 | module_init(msm_serial_hs_init); |
| 3806 | module_exit(msm_serial_hs_exit); |
| 3807 | MODULE_DESCRIPTION("High Speed UART Driver for the MSM chipset"); |
| 3808 | MODULE_LICENSE("GPL v2"); |