Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) "%s:%s " fmt, KBUILD_MODNAME, __func__ |
| 15 | |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 16 | #include <linux/atomic.h> |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 17 | #include <linux/bitmap.h> |
Lina Iyer | 8bb7d5a | 2017-04-20 09:50:41 -0600 | [diff] [blame] | 18 | #include <linux/delay.h> |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/jiffies.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/list.h> |
| 23 | #include <linux/mailbox_client.h> /* For dev_err */ |
| 24 | #include <linux/mailbox_controller.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/of.h> |
| 27 | #include <linux/of_address.h> |
| 28 | #include <linux/of_irq.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/workqueue.h> |
| 32 | |
| 33 | #include <asm-generic/io.h> |
| 34 | |
| 35 | #include <soc/qcom/tcs.h> |
| 36 | |
| 37 | #include <dt-bindings/soc/qcom,tcs-mbox.h> |
| 38 | |
| 39 | #include "mailbox.h" |
| 40 | |
Lina Iyer | ea92144 | 2016-05-26 15:07:48 -0600 | [diff] [blame] | 41 | #define CREATE_TRACE_POINTS |
| 42 | #include <trace/events/rpmh.h> |
| 43 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 44 | #define MAX_CMDS_PER_TCS 16 |
| 45 | #define MAX_TCS_PER_TYPE 3 |
| 46 | #define MAX_TCS_SLOTS (MAX_CMDS_PER_TCS * MAX_TCS_PER_TYPE) |
| 47 | |
| 48 | #define TCS_DRV_TCS_OFFSET 672 |
| 49 | #define TCS_DRV_CMD_OFFSET 20 |
| 50 | |
| 51 | /* DRV Configuration Information Register */ |
| 52 | #define DRV_PRNT_CHLD_CONFIG 0x0C |
| 53 | #define DRV_NUM_TCS_MASK 0x3F |
| 54 | #define DRV_NUM_TCS_SHIFT 6 |
| 55 | #define DRV_NCPT_MASK 0x1F |
| 56 | #define DRV_NCPT_SHIFT 27 |
| 57 | |
| 58 | /* Register offsets */ |
| 59 | #define TCS_DRV_IRQ_ENABLE 0x00 |
| 60 | #define TCS_DRV_IRQ_STATUS 0x04 |
| 61 | #define TCS_DRV_IRQ_CLEAR 0x08 |
| 62 | #define TCS_DRV_CMD_WAIT_FOR_CMPL 0x10 |
| 63 | #define TCS_DRV_CONTROL 0x14 |
| 64 | #define TCS_DRV_STATUS 0x18 |
| 65 | #define TCS_DRV_CMD_ENABLE 0x1C |
| 66 | #define TCS_DRV_CMD_MSGID 0x30 |
| 67 | #define TCS_DRV_CMD_ADDR 0x34 |
| 68 | #define TCS_DRV_CMD_DATA 0x38 |
| 69 | #define TCS_DRV_CMD_STATUS 0x3C |
| 70 | #define TCS_DRV_CMD_RESP_DATA 0x40 |
| 71 | |
| 72 | #define TCS_AMC_MODE_ENABLE BIT(16) |
| 73 | #define TCS_AMC_MODE_TRIGGER BIT(24) |
| 74 | |
| 75 | /* TCS CMD register bit mask */ |
| 76 | #define CMD_MSGID_LEN 8 |
| 77 | #define CMD_MSGID_RESP_REQ BIT(8) |
| 78 | #define CMD_MSGID_WRITE BIT(16) |
| 79 | #define CMD_STATUS_ISSUED BIT(8) |
| 80 | #define CMD_STATUS_COMPL BIT(16) |
| 81 | |
| 82 | /* Control/Hidden TCS */ |
| 83 | #define TCS_HIDDEN_MAX_SLOTS 3 |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 84 | #define TCS_HIDDEN_CMD0_DRV_DATA 0x38 |
| 85 | #define TCS_HIDDEN_CMD_SHIFT 0x08 |
| 86 | |
| 87 | #define TCS_TYPE_NR 4 |
| 88 | #define TCS_MBOX_TOUT_MS 2000 |
| 89 | #define MAX_POOL_SIZE (MAX_TCS_PER_TYPE * TCS_TYPE_NR) |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 90 | #define TCS_M_INIT 0xFFFF |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 91 | |
| 92 | struct tcs_drv; |
| 93 | |
| 94 | struct tcs_response { |
| 95 | struct tcs_drv *drv; |
| 96 | struct mbox_chan *chan; |
| 97 | struct tcs_mbox_msg *msg; |
| 98 | u32 m; /* m-th TCS */ |
| 99 | struct tasklet_struct tasklet; |
| 100 | struct delayed_work dwork; |
| 101 | int err; |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 102 | int idx; |
| 103 | bool in_use; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | struct tcs_response_pool { |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 107 | struct tcs_response resp[MAX_POOL_SIZE]; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 108 | spinlock_t lock; |
| 109 | DECLARE_BITMAP(avail, MAX_POOL_SIZE); |
| 110 | }; |
| 111 | |
| 112 | /* One per TCS type of a controller */ |
| 113 | struct tcs_mbox { |
| 114 | struct tcs_drv *drv; |
| 115 | u32 *cmd_addr; |
| 116 | int type; |
| 117 | u32 tcs_mask; |
| 118 | u32 tcs_offset; |
| 119 | int num_tcs; |
| 120 | int ncpt; /* num cmds per tcs */ |
| 121 | DECLARE_BITMAP(slots, MAX_TCS_SLOTS); |
| 122 | spinlock_t tcs_lock; /* TCS type lock */ |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | /* One per MBOX controller */ |
| 126 | struct tcs_drv { |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 127 | const char *name; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 128 | void *base; /* start address of the RSC's registers */ |
| 129 | void *reg_base; /* start address for DRV specific register */ |
| 130 | int drv_id; |
| 131 | struct platform_device *pdev; |
| 132 | struct mbox_controller mbox; |
| 133 | struct tcs_mbox tcs[TCS_TYPE_NR]; |
| 134 | int num_assigned; |
| 135 | int num_tcs; |
| 136 | struct workqueue_struct *wq; |
| 137 | struct tcs_response_pool *resp_pool; |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 138 | atomic_t tcs_in_use[TCS_TYPE_NR * MAX_TCS_PER_TYPE]; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 139 | }; |
| 140 | |
| 141 | static void tcs_notify_tx_done(unsigned long data); |
| 142 | static void tcs_notify_timeout(struct work_struct *work); |
| 143 | |
| 144 | static int tcs_response_pool_init(struct tcs_drv *drv) |
| 145 | { |
| 146 | struct tcs_response_pool *pool; |
| 147 | int i; |
| 148 | |
| 149 | pool = devm_kzalloc(&drv->pdev->dev, sizeof(*pool), GFP_KERNEL); |
| 150 | if (!pool) |
| 151 | return -ENOMEM; |
| 152 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 153 | for (i = 0; i < MAX_POOL_SIZE; i++) { |
| 154 | tasklet_init(&pool->resp[i].tasklet, tcs_notify_tx_done, |
| 155 | (unsigned long) &pool->resp[i]); |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 156 | INIT_DELAYED_WORK(&pool->resp[i].dwork, tcs_notify_timeout); |
| 157 | pool->resp[i].drv = drv; |
| 158 | pool->resp[i].idx = i; |
| 159 | pool->resp[i].m = TCS_M_INIT; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | spin_lock_init(&pool->lock); |
| 163 | drv->resp_pool = pool; |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 168 | static struct tcs_response *setup_response(struct tcs_drv *drv, |
| 169 | struct tcs_mbox_msg *msg, struct mbox_chan *chan, |
| 170 | u32 m, int err) |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 171 | { |
| 172 | struct tcs_response_pool *pool = drv->resp_pool; |
| 173 | struct tcs_response *resp = ERR_PTR(-ENOMEM); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 174 | int pos; |
| 175 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 176 | spin_lock(&pool->lock); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 177 | pos = find_first_zero_bit(pool->avail, MAX_POOL_SIZE); |
| 178 | if (pos != MAX_POOL_SIZE) { |
| 179 | bitmap_set(pool->avail, pos, 1); |
| 180 | resp = &pool->resp[pos]; |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 181 | resp->chan = chan; |
| 182 | resp->msg = msg; |
| 183 | resp->m = m; |
| 184 | resp->err = err; |
| 185 | resp->in_use = false; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 186 | } |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 187 | spin_unlock(&pool->lock); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 188 | |
| 189 | return resp; |
| 190 | } |
| 191 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 192 | static void free_response(struct tcs_response *resp) |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 193 | { |
| 194 | struct tcs_response_pool *pool = resp->drv->resp_pool; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 195 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 196 | spin_lock(&pool->lock); |
| 197 | resp->err = -EINVAL; |
| 198 | bitmap_clear(pool->avail, resp->idx, 1); |
| 199 | spin_unlock(&pool->lock); |
| 200 | } |
| 201 | |
| 202 | static inline struct tcs_response *get_response(struct tcs_drv *drv, u32 m) |
| 203 | { |
| 204 | struct tcs_response_pool *pool = drv->resp_pool; |
| 205 | struct tcs_response *resp = NULL; |
| 206 | int pos = 0; |
| 207 | |
| 208 | do { |
| 209 | pos = find_next_bit(pool->avail, MAX_POOL_SIZE, pos); |
| 210 | if (pos == MAX_POOL_SIZE) |
| 211 | break; |
| 212 | resp = &pool->resp[pos]; |
| 213 | if (resp->m == m && !resp->in_use) { |
| 214 | resp->in_use = true; |
| 215 | break; |
| 216 | } |
| 217 | pos++; |
| 218 | } while (1); |
| 219 | |
| 220 | return resp; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | static inline u32 read_drv_config(void __iomem *base) |
| 224 | { |
| 225 | return le32_to_cpu(readl_relaxed(base + DRV_PRNT_CHLD_CONFIG)); |
| 226 | } |
| 227 | |
| 228 | static inline u32 read_tcs_reg(void __iomem *base, int reg, int m, int n) |
| 229 | { |
| 230 | return le32_to_cpu(readl_relaxed(base + reg + |
| 231 | TCS_DRV_TCS_OFFSET * m + TCS_DRV_CMD_OFFSET * n)); |
| 232 | } |
| 233 | |
| 234 | static inline void write_tcs_reg(void __iomem *base, int reg, int m, int n, |
| 235 | u32 data) |
| 236 | { |
| 237 | writel_relaxed(cpu_to_le32(data), base + reg + |
| 238 | TCS_DRV_TCS_OFFSET * m + TCS_DRV_CMD_OFFSET * n); |
| 239 | } |
| 240 | |
| 241 | static inline void write_tcs_reg_sync(void __iomem *base, int reg, int m, int n, |
| 242 | u32 data) |
| 243 | { |
| 244 | do { |
| 245 | write_tcs_reg(base, reg, m, n, data); |
| 246 | if (data == read_tcs_reg(base, reg, m, n)) |
| 247 | break; |
Lina Iyer | 8bb7d5a | 2017-04-20 09:50:41 -0600 | [diff] [blame] | 248 | udelay(1); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 249 | } while (1); |
| 250 | } |
| 251 | |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 252 | static inline bool tcs_is_free(struct tcs_drv *drv, int m) |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 253 | { |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 254 | void __iomem *base = drv->reg_base; |
| 255 | |
| 256 | return read_tcs_reg(base, TCS_DRV_STATUS, m, 0) && |
| 257 | !atomic_read(&drv->tcs_in_use[m]); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | static inline struct tcs_mbox *get_tcs_from_index(struct tcs_drv *drv, int m) |
| 261 | { |
| 262 | struct tcs_mbox *tcs; |
| 263 | int i; |
| 264 | |
| 265 | for (i = 0; i < TCS_TYPE_NR; i++) { |
| 266 | tcs = &drv->tcs[i]; |
| 267 | if (tcs->tcs_mask & BIT(m)) |
| 268 | break; |
| 269 | } |
| 270 | |
| 271 | if (i == TCS_TYPE_NR) |
| 272 | tcs = NULL; |
| 273 | |
| 274 | return tcs; |
| 275 | } |
| 276 | |
| 277 | static inline struct tcs_mbox *get_tcs_of_type(struct tcs_drv *drv, int type) |
| 278 | { |
| 279 | int i; |
| 280 | struct tcs_mbox *tcs; |
| 281 | |
| 282 | for (i = 0; i < TCS_TYPE_NR; i++) |
| 283 | if (type == drv->tcs[i].type) |
| 284 | break; |
| 285 | |
| 286 | if (i == TCS_TYPE_NR) |
| 287 | return ERR_PTR(-EINVAL); |
| 288 | |
| 289 | tcs = &drv->tcs[i]; |
| 290 | if (!tcs->num_tcs) |
| 291 | return ERR_PTR(-EINVAL); |
| 292 | |
| 293 | return tcs; |
| 294 | } |
| 295 | |
| 296 | static inline struct tcs_mbox *get_tcs_for_msg(struct tcs_drv *drv, |
| 297 | struct tcs_mbox_msg *msg) |
| 298 | { |
| 299 | int type = -1; |
| 300 | |
| 301 | /* Which box are we dropping this in and do we trigger the TCS */ |
| 302 | switch (msg->state) { |
| 303 | case RPMH_SLEEP_STATE: |
| 304 | type = SLEEP_TCS; |
| 305 | break; |
| 306 | case RPMH_WAKE_ONLY_STATE: |
| 307 | type = WAKE_TCS; |
| 308 | break; |
| 309 | case RPMH_ACTIVE_ONLY_STATE: |
| 310 | type = ACTIVE_TCS; |
| 311 | break; |
Lina Iyer | 21c1788 | 2016-09-22 11:05:51 -0600 | [diff] [blame] | 312 | case RPMH_AWAKE_STATE: |
| 313 | /* |
| 314 | * Awake state is only used when the DRV has no separate |
| 315 | * TCS for ACTIVE requests. Switch to WAKE TCS to send |
| 316 | * active votes. Otherwise, the caller should be explicit |
| 317 | * about the state. |
| 318 | */ |
| 319 | if (IS_ERR(get_tcs_of_type(drv, ACTIVE_TCS))) |
| 320 | type = WAKE_TCS; |
| 321 | break; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | if (msg->is_read) |
| 325 | type = ACTIVE_TCS; |
| 326 | |
| 327 | if (type < 0) |
| 328 | return ERR_PTR(-EINVAL); |
| 329 | |
| 330 | return get_tcs_of_type(drv, type); |
| 331 | } |
| 332 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 333 | static inline void send_tcs_response(struct tcs_response *resp) |
| 334 | { |
| 335 | tasklet_schedule(&resp->tasklet); |
| 336 | } |
| 337 | |
| 338 | static inline void schedule_tcs_err_response(struct tcs_response *resp) |
| 339 | { |
| 340 | schedule_delayed_work(&resp->dwork, msecs_to_jiffies(TCS_MBOX_TOUT_MS)); |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * tcs_irq_handler: TX Done / Recv data handler |
| 345 | */ |
| 346 | static irqreturn_t tcs_irq_handler(int irq, void *p) |
| 347 | { |
| 348 | struct tcs_drv *drv = p; |
| 349 | void __iomem *base = drv->reg_base; |
| 350 | int m, i; |
| 351 | u32 irq_status, sts; |
Lina Iyer | 21c1788 | 2016-09-22 11:05:51 -0600 | [diff] [blame] | 352 | struct tcs_mbox *tcs; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 353 | struct tcs_response *resp; |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 354 | struct tcs_cmd *cmd; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 355 | u32 data; |
| 356 | |
| 357 | /* Know which TCSes were triggered */ |
| 358 | irq_status = read_tcs_reg(base, TCS_DRV_IRQ_STATUS, 0, 0); |
| 359 | |
| 360 | for (m = 0; irq_status >= BIT(m); m++) { |
| 361 | if (!(irq_status & BIT(m))) |
| 362 | continue; |
| 363 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 364 | resp = get_response(drv, m); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 365 | if (!resp) { |
| 366 | pr_err("No resp request for TCS-%d\n", m); |
| 367 | continue; |
| 368 | } |
| 369 | |
| 370 | cancel_delayed_work(&resp->dwork); |
| 371 | |
Lina Iyer | 21c1788 | 2016-09-22 11:05:51 -0600 | [diff] [blame] | 372 | tcs = get_tcs_from_index(drv, m); |
| 373 | if (!tcs) { |
| 374 | pr_err("TCS-%d doesn't exist in DRV\n", m); |
| 375 | continue; |
| 376 | } |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 377 | |
| 378 | /* Check if all commands were completed */ |
| 379 | resp->err = 0; |
| 380 | for (i = 0; i < resp->msg->num_payload; i++) { |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 381 | cmd = &resp->msg->payload[i]; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 382 | sts = read_tcs_reg(base, TCS_DRV_CMD_STATUS, m, i); |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 383 | if ((!(sts & CMD_STATUS_ISSUED)) || |
| 384 | ((resp->msg->is_complete || cmd->complete) && |
| 385 | (!(sts & CMD_STATUS_COMPL)))) |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 386 | resp->err = -EIO; |
| 387 | } |
| 388 | |
| 389 | /* Check for response if this was a read request */ |
| 390 | if (resp->msg->is_read) { |
| 391 | /* Respond the data back in the same req data */ |
| 392 | data = read_tcs_reg(base, TCS_DRV_CMD_RESP_DATA, m, 0); |
| 393 | resp->msg->payload[0].data = data; |
| 394 | mbox_chan_received_data(resp->chan, resp->msg); |
| 395 | } |
| 396 | |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 397 | trace_rpmh_notify_irq(drv->name, m, resp->msg->payload[0].addr, |
| 398 | resp->err); |
Lina Iyer | ea92144 | 2016-05-26 15:07:48 -0600 | [diff] [blame] | 399 | |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 400 | /* Clear the AMC mode for non-ACTIVE TCSes */ |
| 401 | if (tcs->type != ACTIVE_TCS) { |
| 402 | data = read_tcs_reg(base, TCS_DRV_CONTROL, m, 0); |
| 403 | data &= ~TCS_AMC_MODE_ENABLE; |
| 404 | write_tcs_reg(base, TCS_DRV_CONTROL, m, 0, data); |
| 405 | } else { |
| 406 | /* Clear the enable bit for the commands */ |
| 407 | write_tcs_reg(base, TCS_DRV_CMD_ENABLE, m, 0, 0); |
| 408 | } |
| 409 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 410 | /* Clear the TCS IRQ status */ |
| 411 | write_tcs_reg(base, TCS_DRV_IRQ_CLEAR, 0, 0, BIT(m)); |
| 412 | |
| 413 | /* Clean up response object and notify mbox in tasklet */ |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 414 | send_tcs_response(resp); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 415 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 416 | /* Notify the client that this request is completed. */ |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 417 | atomic_set(&drv->tcs_in_use[m], 0); |
| 418 | } |
| 419 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 420 | return IRQ_HANDLED; |
| 421 | } |
| 422 | |
| 423 | static inline void mbox_notify_tx_done(struct mbox_chan *chan, |
| 424 | struct tcs_mbox_msg *msg, int m, int err) |
| 425 | { |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 426 | struct tcs_drv *drv = container_of(chan->mbox, struct tcs_drv, mbox); |
| 427 | |
| 428 | trace_rpmh_notify(drv->name, m, msg->payload[0].addr, err); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 429 | mbox_chan_txdone(chan, err); |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * tcs_notify_tx_done: TX Done for requests that do not trigger TCS |
| 434 | */ |
| 435 | static void tcs_notify_tx_done(unsigned long data) |
| 436 | { |
| 437 | struct tcs_response *resp = (struct tcs_response *) data; |
| 438 | struct mbox_chan *chan = resp->chan; |
| 439 | struct tcs_mbox_msg *msg = resp->msg; |
| 440 | int err = resp->err; |
| 441 | int m = resp->m; |
| 442 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 443 | mbox_notify_tx_done(chan, msg, m, err); |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 444 | free_response(resp); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | /** |
| 448 | * tcs_notify_timeout: TX Done for requests that do trigger TCS, but |
| 449 | * we do not get a response IRQ back. |
| 450 | */ |
| 451 | static void tcs_notify_timeout(struct work_struct *work) |
| 452 | { |
| 453 | struct delayed_work *dwork = to_delayed_work(work); |
| 454 | struct tcs_response *resp = container_of(dwork, |
| 455 | struct tcs_response, dwork); |
| 456 | struct mbox_chan *chan = resp->chan; |
| 457 | struct tcs_mbox_msg *msg = resp->msg; |
| 458 | struct tcs_drv *drv = resp->drv; |
| 459 | int m = resp->m; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 460 | |
| 461 | /* |
| 462 | * In case the RPMH resource fails to respond to the completion |
| 463 | * request, the TCS would be blocked forever waiting on the response. |
| 464 | * There is no way to recover from this case. |
| 465 | */ |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 466 | if (!tcs_is_free(drv, m)) { |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 467 | bool pending = false; |
| 468 | struct tcs_cmd *cmd; |
| 469 | int i; |
| 470 | u32 addr; |
| 471 | |
| 472 | for (i = 0; i < msg->num_payload; i++) { |
| 473 | cmd = &msg->payload[i]; |
| 474 | addr = read_tcs_reg(drv->reg_base, TCS_DRV_CMD_ADDR, |
| 475 | m, i); |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 476 | pending |= (cmd->addr == addr); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 477 | } |
| 478 | if (pending) { |
| 479 | pr_err("TCS-%d blocked waiting for RPMH to respond.\n", |
| 480 | m); |
| 481 | for (i = 0; i < msg->num_payload; i++) |
| 482 | pr_err("Addr: 0x%x Data: 0x%x\n", |
| 483 | msg->payload[i].addr, |
| 484 | msg->payload[i].data); |
| 485 | BUG(); |
| 486 | } |
| 487 | } |
| 488 | |
Lina Iyer | 693cdec | 2017-04-05 12:17:03 -0600 | [diff] [blame] | 489 | mbox_notify_tx_done(chan, msg, -1, -ETIMEDOUT); |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 490 | free_response(resp); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 491 | } |
| 492 | |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 493 | static void __tcs_buffer_write(struct tcs_drv *drv, int d, int m, int n, |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 494 | struct tcs_mbox_msg *msg, bool trigger) |
| 495 | { |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 496 | u32 msgid, cmd_msgid = 0; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 497 | u32 cmd_enable = 0; |
| 498 | u32 cmd_complete; |
| 499 | u32 enable = TCS_AMC_MODE_ENABLE; |
| 500 | struct tcs_cmd *cmd; |
| 501 | int i; |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 502 | void __iomem *base = drv->reg_base; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 503 | |
| 504 | /* We have homologous command set i.e pure read or write, not a mix */ |
| 505 | cmd_msgid = CMD_MSGID_LEN; |
| 506 | cmd_msgid |= (msg->is_complete) ? CMD_MSGID_RESP_REQ : 0; |
| 507 | cmd_msgid |= (!msg->is_read) ? CMD_MSGID_WRITE : 0; |
| 508 | |
| 509 | /* Read the send-after-prev complete flag for those already in TCS */ |
| 510 | cmd_complete = read_tcs_reg(base, TCS_DRV_CMD_WAIT_FOR_CMPL, m, 0); |
| 511 | |
| 512 | for (i = 0; i < msg->num_payload; i++) { |
| 513 | cmd = &msg->payload[i]; |
| 514 | cmd_enable |= BIT(n + i); |
| 515 | cmd_complete |= cmd->complete << (n + i); |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 516 | msgid = cmd_msgid; |
| 517 | msgid |= (cmd->complete) ? CMD_MSGID_RESP_REQ : 0; |
| 518 | write_tcs_reg(base, TCS_DRV_CMD_MSGID, m, n + i, msgid); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 519 | write_tcs_reg(base, TCS_DRV_CMD_ADDR, m, n + i, cmd->addr); |
| 520 | write_tcs_reg(base, TCS_DRV_CMD_DATA, m, n + i, cmd->data); |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 521 | trace_rpmh_send_msg(drv->name, m, n + i, msgid, cmd->addr, |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 522 | cmd->data, cmd->complete, trigger); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | /* Write the send-after-prev completion bits for the batch */ |
| 526 | write_tcs_reg(base, TCS_DRV_CMD_WAIT_FOR_CMPL, m, 0, cmd_complete); |
| 527 | |
| 528 | /* Enable the new commands in TCS */ |
| 529 | cmd_enable |= read_tcs_reg(base, TCS_DRV_CMD_ENABLE, m, 0); |
| 530 | write_tcs_reg(base, TCS_DRV_CMD_ENABLE, m, 0, cmd_enable); |
| 531 | |
| 532 | if (trigger) { |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 533 | /* HW req: Clear the DRV_CONTROL and enable TCS again */ |
| 534 | write_tcs_reg_sync(base, TCS_DRV_CONTROL, m, 0, 0); |
| 535 | write_tcs_reg_sync(base, TCS_DRV_CONTROL, m, 0, enable); |
| 536 | /* Enable the AMC mode on the TCS */ |
| 537 | enable |= TCS_AMC_MODE_TRIGGER; |
| 538 | write_tcs_reg_sync(base, TCS_DRV_CONTROL, m, 0, enable); |
| 539 | } |
| 540 | } |
| 541 | |
Lina Iyer | 0d81e94 | 2016-05-26 11:18:23 -0600 | [diff] [blame] | 542 | /** |
| 543 | * tcs_drv_is_idle: Check if any of the AMCs are busy. |
| 544 | * |
| 545 | * @mbox: The mailbox controller. |
| 546 | * |
| 547 | * Returns true if the AMCs are not engaged or absent. |
| 548 | */ |
| 549 | static bool tcs_drv_is_idle(struct mbox_controller *mbox) |
| 550 | { |
| 551 | int m; |
| 552 | struct tcs_drv *drv = container_of(mbox, struct tcs_drv, mbox); |
| 553 | struct tcs_mbox *tcs = get_tcs_of_type(drv, ACTIVE_TCS); |
| 554 | |
Lina Iyer | 21c1788 | 2016-09-22 11:05:51 -0600 | [diff] [blame] | 555 | /* Check for WAKE TCS if there are no ACTIVE TCS */ |
Lina Iyer | 0d81e94 | 2016-05-26 11:18:23 -0600 | [diff] [blame] | 556 | if (IS_ERR(tcs)) |
Lina Iyer | 21c1788 | 2016-09-22 11:05:51 -0600 | [diff] [blame] | 557 | tcs = get_tcs_of_type(drv, WAKE_TCS); |
Lina Iyer | 0d81e94 | 2016-05-26 11:18:23 -0600 | [diff] [blame] | 558 | |
| 559 | for (m = tcs->tcs_offset; m < tcs->tcs_offset + tcs->num_tcs; m++) |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 560 | if (!tcs_is_free(drv, m)) |
Lina Iyer | 0d81e94 | 2016-05-26 11:18:23 -0600 | [diff] [blame] | 561 | return false; |
| 562 | |
| 563 | return true; |
| 564 | } |
| 565 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 566 | static void wait_for_req_inflight(struct tcs_drv *drv, struct tcs_mbox *tcs, |
| 567 | struct tcs_mbox_msg *msg) |
| 568 | { |
| 569 | u32 curr_enabled; |
| 570 | int i, j, k; |
| 571 | bool is_free; |
| 572 | |
| 573 | do { |
| 574 | is_free = true; |
| 575 | for (i = 1; i > tcs->tcs_mask; i = i << 1) { |
| 576 | if (!(tcs->tcs_mask & i)) |
| 577 | continue; |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 578 | if (tcs_is_free(drv, i)) |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 579 | continue; |
| 580 | curr_enabled = read_tcs_reg(drv->reg_base, |
| 581 | TCS_DRV_CMD_ENABLE, i, 0); |
| 582 | for (j = 0; j < msg->num_payload; j++) { |
| 583 | for (k = 0; k < curr_enabled; k++) { |
| 584 | if (!(curr_enabled & BIT(k))) |
| 585 | continue; |
| 586 | if (tcs->cmd_addr[k] == |
| 587 | msg->payload[j].addr) { |
| 588 | is_free = false; |
| 589 | goto retry; |
| 590 | } |
| 591 | } |
| 592 | } |
| 593 | } |
| 594 | retry: |
| 595 | if (!is_free) |
Lina Iyer | 8bb7d5a | 2017-04-20 09:50:41 -0600 | [diff] [blame] | 596 | udelay(1); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 597 | } while (!is_free); |
| 598 | } |
| 599 | |
| 600 | static int find_free_tcs(struct tcs_mbox *tcs) |
| 601 | { |
| 602 | int slot, m = 0; |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 603 | u32 irq_status; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 604 | |
| 605 | /* Loop until we find a free AMC */ |
| 606 | do { |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 607 | if (tcs_is_free(tcs->drv, tcs->tcs_offset + m)) { |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 608 | slot = m * tcs->ncpt; |
| 609 | break; |
| 610 | } |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 611 | if (++m >= tcs->num_tcs) { |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 612 | m = 0; |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 613 | irq_status = read_tcs_reg(tcs->drv->reg_base, |
| 614 | TCS_DRV_IRQ_STATUS, 0, 0); |
| 615 | WARN((irq_status & tcs->tcs_mask && in_irq()), |
| 616 | "TCS busy. Request should not be made from hard IRQ context."); |
| 617 | udelay(10); |
| 618 | } |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 619 | } while (1); |
| 620 | |
| 621 | return slot; |
| 622 | } |
| 623 | |
| 624 | static int find_match(struct tcs_mbox *tcs, struct tcs_cmd *cmd, int len) |
| 625 | { |
| 626 | bool found = false; |
| 627 | int i = 0, j; |
| 628 | |
| 629 | /* Check for already cached commands */ |
| 630 | while ((i = find_next_bit(tcs->slots, MAX_TCS_SLOTS, i)) < |
| 631 | MAX_TCS_SLOTS) { |
| 632 | if (tcs->cmd_addr[i] != cmd[0].addr) { |
| 633 | i++; |
| 634 | continue; |
| 635 | } |
| 636 | /* sanity check to ensure the seq is same */ |
| 637 | for (j = 1; j < len; j++) { |
| 638 | WARN((tcs->cmd_addr[i + j] != cmd[j].addr), |
| 639 | "Message does not match previous sequence.\n"); |
| 640 | return -EINVAL; |
| 641 | } |
| 642 | found = true; |
| 643 | break; |
| 644 | } |
| 645 | |
| 646 | return found ? i : -1; |
| 647 | } |
| 648 | |
| 649 | static int find_slots(struct tcs_mbox *tcs, struct tcs_mbox_msg *msg) |
| 650 | { |
| 651 | int slot; |
| 652 | int n = 0; |
| 653 | |
| 654 | /* For active requests find the first free AMC. */ |
| 655 | if (tcs->type == ACTIVE_TCS) |
| 656 | return find_free_tcs(tcs); |
| 657 | |
| 658 | /* Find if we already have the msg in our TCS */ |
| 659 | slot = find_match(tcs, msg->payload, msg->num_payload); |
| 660 | if (slot >= 0) |
| 661 | return slot; |
| 662 | |
| 663 | /* Do over, until we can fit the full payload in a TCS */ |
| 664 | do { |
| 665 | slot = bitmap_find_next_zero_area(tcs->slots, MAX_TCS_SLOTS, |
| 666 | n, msg->num_payload, 0); |
| 667 | if (slot == MAX_TCS_SLOTS) |
| 668 | break; |
| 669 | n += tcs->ncpt; |
| 670 | } while (slot + msg->num_payload - 1 >= n); |
| 671 | |
| 672 | return (slot != MAX_TCS_SLOTS) ? slot : -ENOMEM; |
| 673 | } |
| 674 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 675 | static int tcs_mbox_write(struct mbox_chan *chan, struct tcs_mbox_msg *msg, |
| 676 | bool trigger) |
| 677 | { |
| 678 | const struct device *dev = chan->cl->dev; |
| 679 | struct tcs_drv *drv = container_of(chan->mbox, struct tcs_drv, mbox); |
| 680 | int d = drv->drv_id; |
| 681 | struct tcs_mbox *tcs; |
| 682 | int i, slot, offset, m, n; |
Channagoud Kadabi | 075db3b | 2017-03-16 14:26:17 -0700 | [diff] [blame] | 683 | struct tcs_response *resp = NULL; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 684 | |
| 685 | tcs = get_tcs_for_msg(drv, msg); |
| 686 | if (IS_ERR(tcs)) |
| 687 | return PTR_ERR(tcs); |
| 688 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 689 | if (trigger) |
| 690 | resp = setup_response(drv, msg, chan, TCS_M_INIT, 0); |
| 691 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 692 | /* Identify the sequential slots that we can write to */ |
| 693 | spin_lock(&tcs->tcs_lock); |
| 694 | slot = find_slots(tcs, msg); |
| 695 | if (slot < 0) { |
| 696 | dev_err(dev, "No TCS slot found.\n"); |
| 697 | spin_unlock(&tcs->tcs_lock); |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 698 | if (resp) |
| 699 | free_response(resp); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 700 | return slot; |
| 701 | } |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 702 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 703 | /* Mark the slots as in-use, before we unlock */ |
| 704 | if (tcs->type == SLEEP_TCS || tcs->type == WAKE_TCS) |
| 705 | bitmap_set(tcs->slots, slot, msg->num_payload); |
| 706 | |
| 707 | /* Copy the addresses of the resources over to the slots */ |
| 708 | for (i = 0; tcs->cmd_addr && i < msg->num_payload; i++) |
| 709 | tcs->cmd_addr[slot + i] = msg->payload[i].addr; |
| 710 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 711 | offset = slot / tcs->ncpt; |
| 712 | m = offset + tcs->tcs_offset; |
| 713 | n = slot % tcs->ncpt; |
| 714 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 715 | /* Block, if we have an address from the msg in flight */ |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 716 | if (trigger) { |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 717 | resp->m = m; |
| 718 | /* Mark the TCS as busy */ |
| 719 | atomic_set(&drv->tcs_in_use[m], 1); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 720 | wait_for_req_inflight(drv, tcs, msg); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | /* Write to the TCS or AMC */ |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 724 | __tcs_buffer_write(drv, d, m, n, msg, trigger); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 725 | |
| 726 | /* Schedule a timeout response, incase there is no actual response */ |
| 727 | if (trigger) |
| 728 | schedule_tcs_err_response(resp); |
| 729 | |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 730 | spin_unlock(&tcs->tcs_lock); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 735 | static void __tcs_buffer_invalidate(void __iomem *base, int m) |
| 736 | { |
| 737 | write_tcs_reg(base, TCS_DRV_CMD_ENABLE, m, 0, 0); |
| 738 | } |
| 739 | |
| 740 | static int tcs_mbox_invalidate(struct mbox_chan *chan) |
| 741 | { |
| 742 | struct tcs_drv *drv = container_of(chan->mbox, struct tcs_drv, mbox); |
| 743 | struct tcs_mbox *tcs; |
| 744 | int m, i; |
| 745 | int inv_types[] = { WAKE_TCS, SLEEP_TCS }; |
| 746 | int type = 0; |
| 747 | |
| 748 | do { |
| 749 | tcs = get_tcs_of_type(drv, inv_types[type]); |
| 750 | if (IS_ERR(tcs)) |
| 751 | return PTR_ERR(tcs); |
| 752 | |
| 753 | spin_lock(&tcs->tcs_lock); |
| 754 | for (i = 0; i < tcs->num_tcs; i++) { |
| 755 | m = i + tcs->tcs_offset; |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 756 | while (!tcs_is_free(drv, m)) |
Lina Iyer | 8bb7d5a | 2017-04-20 09:50:41 -0600 | [diff] [blame] | 757 | udelay(1); |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 758 | __tcs_buffer_invalidate(drv->reg_base, m); |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 759 | } |
| 760 | /* Mark the TCS as free */ |
| 761 | bitmap_zero(tcs->slots, MAX_TCS_SLOTS); |
| 762 | spin_unlock(&tcs->tcs_lock); |
| 763 | } while (++type < ARRAY_SIZE(inv_types)); |
| 764 | |
| 765 | return 0; |
| 766 | } |
| 767 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 768 | /** |
| 769 | * chan_tcs_write: Validate the incoming message and write to the |
| 770 | * appropriate TCS block. |
| 771 | * |
| 772 | * @chan: the MBOX channel |
| 773 | * @data: the tcs_mbox_msg* |
| 774 | * |
| 775 | * Returns a negative error for invalid message structure and invalid |
| 776 | * message combination, -EBUSY if there is an other active request for |
| 777 | * the channel in process, otherwise bubbles up internal error. |
| 778 | */ |
| 779 | static int chan_tcs_write(struct mbox_chan *chan, void *data) |
| 780 | { |
| 781 | struct tcs_mbox_msg *msg = data; |
| 782 | const struct device *dev = chan->cl->dev; |
| 783 | int ret = -EINVAL; |
| 784 | |
| 785 | if (!msg) { |
| 786 | dev_err(dev, "Payload error.\n"); |
| 787 | goto tx_fail; |
| 788 | } |
| 789 | |
| 790 | if (!msg->payload || msg->num_payload > MAX_RPMH_PAYLOAD) { |
| 791 | dev_err(dev, "Payload error.\n"); |
| 792 | goto tx_fail; |
| 793 | } |
| 794 | |
| 795 | if (msg->invalidate || msg->is_control) { |
| 796 | dev_err(dev, "Incorrect API.\n"); |
| 797 | goto tx_fail; |
| 798 | } |
| 799 | |
Lina Iyer | 21c1788 | 2016-09-22 11:05:51 -0600 | [diff] [blame] | 800 | if (msg->state != RPMH_ACTIVE_ONLY_STATE && |
| 801 | msg->state != RPMH_AWAKE_STATE) { |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 802 | dev_err(dev, "Incorrect API.\n"); |
| 803 | goto tx_fail; |
| 804 | } |
| 805 | |
| 806 | /* Read requests should always be single */ |
| 807 | if (msg->is_read && msg->num_payload > 1) { |
| 808 | dev_err(dev, "Incorrect read request.\n"); |
| 809 | goto tx_fail; |
| 810 | } |
| 811 | |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 812 | /* |
| 813 | * Since we are re-purposing the wake TCS, invalidate previous |
| 814 | * contents to avoid confusion. |
| 815 | */ |
| 816 | if (msg->state == RPMH_AWAKE_STATE) |
| 817 | tcs_mbox_invalidate(chan); |
| 818 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 819 | /* Post the message to the TCS and trigger */ |
| 820 | ret = tcs_mbox_write(chan, msg, true); |
| 821 | |
| 822 | tx_fail: |
| 823 | if (ret) { |
| 824 | struct tcs_drv *drv = container_of(chan->mbox, |
Lina Iyer | c8712ca | 2017-04-20 00:18:49 -0600 | [diff] [blame] | 825 | struct tcs_drv, mbox); |
| 826 | struct tcs_response *resp = setup_response( |
| 827 | drv, msg, chan, TCS_M_INIT, ret); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 828 | |
| 829 | dev_err(dev, "Error sending RPMH message %d\n", ret); |
| 830 | send_tcs_response(resp); |
| 831 | } |
| 832 | |
| 833 | return 0; |
| 834 | } |
| 835 | |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 836 | static void __tcs_write_hidden(struct tcs_drv *drv, int d, |
| 837 | struct tcs_mbox_msg *msg) |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 838 | { |
| 839 | int i; |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 840 | void __iomem *addr = drv->base + TCS_HIDDEN_CMD0_DRV_DATA; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 841 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 842 | for (i = 0; i < msg->num_payload; i++) { |
| 843 | /* Only data is write capable */ |
Lina Iyer | d93fbce | 2017-03-01 09:07:20 -0700 | [diff] [blame] | 844 | writel_relaxed(cpu_to_le32(msg->payload[i].data), addr); |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 845 | trace_rpmh_control_msg(drv->name, msg->payload[i].data); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 846 | addr += TCS_HIDDEN_CMD_SHIFT; |
| 847 | } |
| 848 | } |
| 849 | |
| 850 | static int tcs_control_write(struct mbox_chan *chan, struct tcs_mbox_msg *msg) |
| 851 | { |
| 852 | const struct device *dev = chan->cl->dev; |
| 853 | struct tcs_drv *drv = container_of(chan->mbox, struct tcs_drv, mbox); |
| 854 | struct tcs_mbox *tcs; |
| 855 | |
| 856 | tcs = get_tcs_of_type(drv, CONTROL_TCS); |
| 857 | if (IS_ERR(tcs)) |
| 858 | return PTR_ERR(tcs); |
| 859 | |
| 860 | if (msg->num_payload != tcs->ncpt) { |
| 861 | dev_err(dev, "Request must fit the control TCS size.\n"); |
| 862 | return -EINVAL; |
| 863 | } |
| 864 | |
| 865 | spin_lock(&tcs->tcs_lock); |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 866 | __tcs_write_hidden(tcs->drv, drv->drv_id, msg); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 867 | spin_unlock(&tcs->tcs_lock); |
| 868 | |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | /** |
| 873 | * chan_tcs_ctrl_write: Write message to the controller, no ACK sent. |
| 874 | * |
| 875 | * @chan: the MBOX channel |
| 876 | * @data: the tcs_mbox_msg* |
| 877 | */ |
| 878 | static int chan_tcs_ctrl_write(struct mbox_chan *chan, void *data) |
| 879 | { |
| 880 | struct tcs_mbox_msg *msg = data; |
| 881 | const struct device *dev = chan->cl->dev; |
| 882 | int ret = -EINVAL; |
| 883 | |
| 884 | if (!msg) { |
| 885 | dev_err(dev, "Payload error.\n"); |
| 886 | goto tx_done; |
| 887 | } |
| 888 | |
| 889 | if (msg->num_payload > MAX_RPMH_PAYLOAD) { |
| 890 | dev_err(dev, "Payload error.\n"); |
| 891 | goto tx_done; |
| 892 | } |
| 893 | |
| 894 | /* Invalidate sleep/wake TCS */ |
| 895 | if (msg->invalidate) { |
| 896 | ret = tcs_mbox_invalidate(chan); |
| 897 | goto tx_done; |
| 898 | } |
| 899 | |
| 900 | /* Control slots are unique. They carry specific data. */ |
| 901 | if (msg->is_control) { |
| 902 | ret = tcs_control_write(chan, msg); |
| 903 | goto tx_done; |
| 904 | } |
| 905 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 906 | /* Post the message to the TCS without trigger */ |
| 907 | ret = tcs_mbox_write(chan, msg, false); |
| 908 | |
| 909 | tx_done: |
| 910 | return ret; |
| 911 | } |
| 912 | |
| 913 | static int chan_init(struct mbox_chan *chan) |
| 914 | { |
| 915 | return 0; |
| 916 | } |
| 917 | |
| 918 | static void chan_shutdown(struct mbox_chan *chan) |
| 919 | { } |
| 920 | |
| 921 | static const struct mbox_chan_ops mbox_ops = { |
| 922 | .send_data = chan_tcs_write, |
| 923 | .send_controller_data = chan_tcs_ctrl_write, |
| 924 | .startup = chan_init, |
| 925 | .shutdown = chan_shutdown, |
| 926 | }; |
| 927 | |
| 928 | static struct mbox_chan *of_tcs_mbox_xlate(struct mbox_controller *mbox, |
| 929 | const struct of_phandle_args *sp) |
| 930 | { |
| 931 | struct tcs_drv *drv = container_of(mbox, struct tcs_drv, mbox); |
| 932 | struct mbox_chan *chan; |
| 933 | |
| 934 | if (drv->num_assigned >= mbox->num_chans) { |
| 935 | pr_err("TCS-Mbox out of channel memory\n"); |
| 936 | return ERR_PTR(-ENOMEM); |
| 937 | } |
| 938 | |
| 939 | chan = &mbox->chans[drv->num_assigned++]; |
| 940 | |
| 941 | return chan; |
| 942 | } |
| 943 | |
| 944 | static int tcs_drv_probe(struct platform_device *pdev) |
| 945 | { |
| 946 | struct device_node *dn = pdev->dev.of_node; |
| 947 | struct device_node *np; |
| 948 | struct tcs_drv *drv; |
| 949 | struct mbox_chan *chans; |
| 950 | struct tcs_mbox *tcs; |
| 951 | struct of_phandle_args p; |
| 952 | int irq; |
| 953 | u32 val[8] = { 0 }; |
| 954 | int num_chans = 0; |
| 955 | int st = 0; |
| 956 | int i, j, ret, nelem; |
| 957 | u32 config, max_tcs, ncpt; |
Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 958 | int tcs_type_count[TCS_TYPE_NR] = { 0 }; |
| 959 | struct resource *res; |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 960 | u32 irq_mask; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 961 | |
| 962 | drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL); |
| 963 | if (!drv) |
| 964 | return -ENOMEM; |
| 965 | |
Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 966 | ret = of_property_read_u32(dn, "qcom,drv-id", &drv->drv_id); |
| 967 | if (ret) |
| 968 | return ret; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 969 | |
Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 970 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 971 | if (!res) |
| 972 | return -EINVAL; |
| 973 | drv->base = devm_ioremap_resource(&pdev->dev, res); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 974 | if (IS_ERR(drv->base)) |
| 975 | return PTR_ERR(drv->base); |
| 976 | |
Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 977 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 978 | if (!res) |
| 979 | return -EINVAL; |
| 980 | drv->reg_base = devm_ioremap_resource(&pdev->dev, res); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 981 | if (IS_ERR(drv->reg_base)) |
| 982 | return PTR_ERR(drv->reg_base); |
| 983 | |
| 984 | config = read_drv_config(drv->base); |
| 985 | max_tcs = config & (DRV_NUM_TCS_MASK << |
| 986 | (DRV_NUM_TCS_SHIFT * drv->drv_id)); |
| 987 | max_tcs = max_tcs >> (DRV_NUM_TCS_SHIFT * drv->drv_id); |
| 988 | ncpt = config & (DRV_NCPT_MASK << DRV_NCPT_SHIFT); |
| 989 | ncpt = ncpt >> DRV_NCPT_SHIFT; |
| 990 | |
| 991 | nelem = of_property_count_elems_of_size(dn, "qcom,tcs-config", |
| 992 | sizeof(u32)); |
| 993 | if (!nelem || (nelem % 2) || (nelem > 2 * TCS_TYPE_NR)) |
| 994 | return -EINVAL; |
| 995 | |
| 996 | ret = of_property_read_u32_array(dn, "qcom,tcs-config", val, nelem); |
| 997 | if (ret) |
| 998 | return ret; |
| 999 | |
Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 1000 | /* Ensure we have exactly not more than one of each type in DT */ |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1001 | for (i = 0; i < (nelem / 2); i++) { |
Lina Iyer | 7310142 | 2017-02-16 14:09:25 -0700 | [diff] [blame] | 1002 | if (val[2 * i] >= TCS_TYPE_NR) |
| 1003 | return -EINVAL; |
| 1004 | tcs_type_count[val[2 * i]]++; |
| 1005 | if (tcs_type_count[val[2 * i]] > 1) |
| 1006 | return -EINVAL; |
| 1007 | } |
| 1008 | |
| 1009 | /* Ensure we have each type specified in DT */ |
| 1010 | for (i = 0; i < ARRAY_SIZE(tcs_type_count); i++) |
| 1011 | if (!tcs_type_count[i]) |
| 1012 | return -EINVAL; |
| 1013 | |
| 1014 | for (i = 0; i < (nelem / 2); i++) { |
| 1015 | tcs = &drv->tcs[val[2 * i]]; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1016 | tcs->drv = drv; |
| 1017 | tcs->type = val[2 * i]; |
| 1018 | tcs->num_tcs = val[2 * i + 1]; |
| 1019 | tcs->ncpt = (tcs->type == CONTROL_TCS) ? TCS_HIDDEN_MAX_SLOTS |
| 1020 | : ncpt; |
| 1021 | spin_lock_init(&tcs->tcs_lock); |
| 1022 | |
| 1023 | if (tcs->num_tcs <= 0 || tcs->type == CONTROL_TCS) |
| 1024 | continue; |
| 1025 | |
| 1026 | if (tcs->num_tcs > MAX_TCS_PER_TYPE) |
| 1027 | return -EINVAL; |
| 1028 | |
| 1029 | if (st > max_tcs) |
| 1030 | return -EINVAL; |
| 1031 | |
| 1032 | tcs->tcs_mask = ((1 << tcs->num_tcs) - 1) << st; |
| 1033 | tcs->tcs_offset = st; |
| 1034 | st += tcs->num_tcs; |
| 1035 | |
| 1036 | tcs->cmd_addr = devm_kzalloc(&pdev->dev, sizeof(u32) * |
| 1037 | tcs->num_tcs * tcs->ncpt, GFP_KERNEL); |
| 1038 | if (!tcs->cmd_addr) |
| 1039 | return -ENOMEM; |
| 1040 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1041 | } |
| 1042 | |
| 1043 | /* Allocate only that many channels specified in DT for our MBOX */ |
| 1044 | for_each_node_with_property(np, "mboxes") { |
| 1045 | if (!of_device_is_available(np)) |
| 1046 | continue; |
| 1047 | i = of_count_phandle_with_args(np, "mboxes", "#mbox-cells"); |
| 1048 | for (j = 0; j < i; j++) { |
| 1049 | ret = of_parse_phandle_with_args(np, "mboxes", |
| 1050 | "#mbox-cells", j, &p); |
| 1051 | if (!ret && p.np == pdev->dev.of_node) |
| 1052 | break; |
| 1053 | } |
| 1054 | num_chans++; |
| 1055 | } |
| 1056 | |
| 1057 | if (!num_chans) { |
| 1058 | pr_err("%s: No clients for controller (%s)\n", __func__, |
| 1059 | dn->full_name); |
| 1060 | return -ENODEV; |
| 1061 | } |
| 1062 | |
| 1063 | chans = devm_kzalloc(&pdev->dev, num_chans * sizeof(*chans), |
| 1064 | GFP_KERNEL); |
| 1065 | if (!chans) |
| 1066 | return -ENOMEM; |
| 1067 | |
| 1068 | for (i = 0; i < num_chans; i++) { |
| 1069 | chans[i].mbox = &drv->mbox; |
| 1070 | chans[i].txdone_method = TXDONE_BY_IRQ; |
| 1071 | } |
| 1072 | |
| 1073 | drv->mbox.dev = &pdev->dev; |
| 1074 | drv->mbox.ops = &mbox_ops; |
| 1075 | drv->mbox.chans = chans; |
| 1076 | drv->mbox.num_chans = num_chans; |
| 1077 | drv->mbox.txdone_irq = true; |
| 1078 | drv->mbox.of_xlate = of_tcs_mbox_xlate; |
Lina Iyer | 0d81e94 | 2016-05-26 11:18:23 -0600 | [diff] [blame] | 1079 | drv->mbox.is_idle = tcs_drv_is_idle; |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1080 | drv->num_tcs = st; |
| 1081 | drv->pdev = pdev; |
| 1082 | |
Lina Iyer | 884981e | 2017-03-21 13:43:05 -0600 | [diff] [blame] | 1083 | drv->name = of_get_property(pdev->dev.of_node, "label", NULL); |
| 1084 | if (!drv->name) |
| 1085 | drv->name = dev_name(&pdev->dev); |
| 1086 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1087 | ret = tcs_response_pool_init(drv); |
| 1088 | if (ret) |
| 1089 | return ret; |
| 1090 | |
| 1091 | irq = of_irq_get(dn, 0); |
| 1092 | if (irq < 0) |
| 1093 | return irq; |
| 1094 | |
Lina Iyer | afcdc18 | 2017-04-19 18:31:04 -0600 | [diff] [blame] | 1095 | ret = devm_request_irq(&pdev->dev, irq, tcs_irq_handler, |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1096 | IRQF_ONESHOT | IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND, |
| 1097 | "tcs_irq", drv); |
| 1098 | if (ret) |
| 1099 | return ret; |
| 1100 | |
Lina Iyer | 7846e21 | 2017-03-22 10:35:53 -0600 | [diff] [blame] | 1101 | /* |
| 1102 | * Enable interrupts for AMC TCS, |
| 1103 | * if there are no AMC TCS, use wake TCS. |
| 1104 | */ |
| 1105 | irq_mask = (drv->tcs[ACTIVE_TCS].num_tcs) ? |
| 1106 | drv->tcs[ACTIVE_TCS].tcs_mask : |
| 1107 | drv->tcs[WAKE_TCS].tcs_mask; |
| 1108 | write_tcs_reg(drv->reg_base, TCS_DRV_IRQ_ENABLE, 0, 0, irq_mask); |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1109 | |
Lina Iyer | b68814f | 2017-04-14 12:49:07 -0600 | [diff] [blame] | 1110 | for (i = 0; i < ARRAY_SIZE(drv->tcs_in_use); i++) |
| 1111 | atomic_set(&drv->tcs_in_use[i], 0); |
| 1112 | |
Lina Iyer | 88a8fda | 2016-04-01 08:23:31 -0600 | [diff] [blame] | 1113 | ret = mbox_controller_register(&drv->mbox); |
| 1114 | if (ret) |
| 1115 | return ret; |
| 1116 | |
| 1117 | pr_debug("Mailbox controller (%s, drv=%d) registered\n", |
| 1118 | dn->full_name, drv->drv_id); |
| 1119 | |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
| 1123 | static const struct of_device_id tcs_drv_match[] = { |
| 1124 | { .compatible = "qcom,tcs-drv", }, |
| 1125 | { } |
| 1126 | }; |
| 1127 | |
| 1128 | static struct platform_driver tcs_mbox_driver = { |
| 1129 | .probe = tcs_drv_probe, |
| 1130 | .driver = { |
| 1131 | .name = KBUILD_MODNAME, |
| 1132 | .of_match_table = tcs_drv_match, |
| 1133 | }, |
| 1134 | }; |
| 1135 | |
| 1136 | static int __init tcs_mbox_driver_init(void) |
| 1137 | { |
| 1138 | return platform_driver_register(&tcs_mbox_driver); |
| 1139 | } |
| 1140 | arch_initcall(tcs_mbox_driver_init); |