Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 1 | /* OMAP SSI driver. |
| 2 | * |
| 3 | * Copyright (C) 2010 Nokia Corporation. All rights reserved. |
| 4 | * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> |
| 5 | * |
| 6 | * Contact: Carlos Chinea <carlos.chinea@nokia.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * version 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 20 | * 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include <linux/compiler.h> |
| 24 | #include <linux/err.h> |
| 25 | #include <linux/ioport.h> |
| 26 | #include <linux/io.h> |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 27 | #include <linux/clk.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/dma-mapping.h> |
| 31 | #include <linux/dmaengine.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/seq_file.h> |
| 34 | #include <linux/scatterlist.h> |
| 35 | #include <linux/interrupt.h> |
| 36 | #include <linux/spinlock.h> |
| 37 | #include <linux/debugfs.h> |
Arnd Bergmann | ac8e3ff | 2016-05-03 17:16:21 +0200 | [diff] [blame] | 38 | #include <linux/pinctrl/consumer.h> |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 39 | #include <linux/pm_runtime.h> |
| 40 | #include <linux/of_platform.h> |
| 41 | #include <linux/hsi/hsi.h> |
| 42 | #include <linux/idr.h> |
| 43 | |
| 44 | #include "omap_ssi_regs.h" |
| 45 | #include "omap_ssi.h" |
| 46 | |
| 47 | /* For automatically allocated device IDs */ |
| 48 | static DEFINE_IDA(platform_omap_ssi_ida); |
| 49 | |
| 50 | #ifdef CONFIG_DEBUG_FS |
| 51 | static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused) |
| 52 | { |
| 53 | struct hsi_controller *ssi = m->private; |
| 54 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 55 | void __iomem *sys = omap_ssi->sys; |
| 56 | |
| 57 | pm_runtime_get_sync(ssi->device.parent); |
| 58 | seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); |
| 59 | seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); |
| 60 | seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); |
Sebastian Reichel | ea88f71 | 2016-06-17 20:59:46 +0200 | [diff] [blame] | 61 | pm_runtime_put(ssi->device.parent); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused) |
| 67 | { |
| 68 | struct hsi_controller *ssi = m->private; |
| 69 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 70 | void __iomem *gdd = omap_ssi->gdd; |
| 71 | void __iomem *sys = omap_ssi->sys; |
| 72 | int lch; |
| 73 | |
| 74 | pm_runtime_get_sync(ssi->device.parent); |
| 75 | |
| 76 | seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", |
| 77 | readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); |
| 78 | seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", |
| 79 | readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); |
| 80 | seq_printf(m, "HW_ID\t\t: 0x%08x\n", |
| 81 | readl(gdd + SSI_GDD_HW_ID_REG)); |
| 82 | seq_printf(m, "PPORT_ID\t: 0x%08x\n", |
| 83 | readl(gdd + SSI_GDD_PPORT_ID_REG)); |
| 84 | seq_printf(m, "MPORT_ID\t: 0x%08x\n", |
| 85 | readl(gdd + SSI_GDD_MPORT_ID_REG)); |
| 86 | seq_printf(m, "TEST\t\t: 0x%08x\n", |
| 87 | readl(gdd + SSI_GDD_TEST_REG)); |
| 88 | seq_printf(m, "GCR\t\t: 0x%08x\n", |
| 89 | readl(gdd + SSI_GDD_GCR_REG)); |
| 90 | |
| 91 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { |
| 92 | seq_printf(m, "\nGDD LCH %d\n=========\n", lch); |
| 93 | seq_printf(m, "CSDP\t\t: 0x%04x\n", |
| 94 | readw(gdd + SSI_GDD_CSDP_REG(lch))); |
| 95 | seq_printf(m, "CCR\t\t: 0x%04x\n", |
| 96 | readw(gdd + SSI_GDD_CCR_REG(lch))); |
| 97 | seq_printf(m, "CICR\t\t: 0x%04x\n", |
| 98 | readw(gdd + SSI_GDD_CICR_REG(lch))); |
| 99 | seq_printf(m, "CSR\t\t: 0x%04x\n", |
| 100 | readw(gdd + SSI_GDD_CSR_REG(lch))); |
| 101 | seq_printf(m, "CSSA\t\t: 0x%08x\n", |
| 102 | readl(gdd + SSI_GDD_CSSA_REG(lch))); |
| 103 | seq_printf(m, "CDSA\t\t: 0x%08x\n", |
| 104 | readl(gdd + SSI_GDD_CDSA_REG(lch))); |
| 105 | seq_printf(m, "CEN\t\t: 0x%04x\n", |
| 106 | readw(gdd + SSI_GDD_CEN_REG(lch))); |
| 107 | seq_printf(m, "CSAC\t\t: 0x%04x\n", |
| 108 | readw(gdd + SSI_GDD_CSAC_REG(lch))); |
| 109 | seq_printf(m, "CDAC\t\t: 0x%04x\n", |
| 110 | readw(gdd + SSI_GDD_CDAC_REG(lch))); |
| 111 | seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", |
| 112 | readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); |
| 113 | } |
| 114 | |
Sebastian Reichel | ea88f71 | 2016-06-17 20:59:46 +0200 | [diff] [blame] | 115 | pm_runtime_put(ssi->device.parent); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static int ssi_regs_open(struct inode *inode, struct file *file) |
| 121 | { |
| 122 | return single_open(file, ssi_debug_show, inode->i_private); |
| 123 | } |
| 124 | |
| 125 | static int ssi_gdd_regs_open(struct inode *inode, struct file *file) |
| 126 | { |
| 127 | return single_open(file, ssi_debug_gdd_show, inode->i_private); |
| 128 | } |
| 129 | |
| 130 | static const struct file_operations ssi_regs_fops = { |
| 131 | .open = ssi_regs_open, |
| 132 | .read = seq_read, |
| 133 | .llseek = seq_lseek, |
| 134 | .release = single_release, |
| 135 | }; |
| 136 | |
| 137 | static const struct file_operations ssi_gdd_regs_fops = { |
| 138 | .open = ssi_gdd_regs_open, |
| 139 | .read = seq_read, |
| 140 | .llseek = seq_lseek, |
| 141 | .release = single_release, |
| 142 | }; |
| 143 | |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 144 | static int ssi_debug_add_ctrl(struct hsi_controller *ssi) |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 145 | { |
| 146 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 147 | struct dentry *dir; |
| 148 | |
| 149 | /* SSI controller */ |
| 150 | omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); |
Wei Yongjun | 3fd276e | 2014-07-30 08:53:41 +0800 | [diff] [blame] | 151 | if (!omap_ssi->dir) |
| 152 | return -ENOMEM; |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 153 | |
| 154 | debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, |
| 155 | &ssi_regs_fops); |
| 156 | /* SSI GDD (DMA) */ |
| 157 | dir = debugfs_create_dir("gdd", omap_ssi->dir); |
Wei Yongjun | 3fd276e | 2014-07-30 08:53:41 +0800 | [diff] [blame] | 158 | if (!dir) |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 159 | goto rback; |
| 160 | debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); |
| 161 | |
| 162 | return 0; |
| 163 | rback: |
| 164 | debugfs_remove_recursive(omap_ssi->dir); |
| 165 | |
Wei Yongjun | 3fd276e | 2014-07-30 08:53:41 +0800 | [diff] [blame] | 166 | return -ENOMEM; |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) |
| 170 | { |
| 171 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 172 | |
| 173 | debugfs_remove_recursive(omap_ssi->dir); |
| 174 | } |
| 175 | #endif /* CONFIG_DEBUG_FS */ |
| 176 | |
| 177 | /* |
| 178 | * FIXME: Horrible HACK needed until we remove the useless wakeline test |
| 179 | * in the CMT. To be removed !!!! |
| 180 | */ |
| 181 | void ssi_waketest(struct hsi_client *cl, unsigned int enable) |
| 182 | { |
| 183 | struct hsi_port *port = hsi_get_port(cl); |
| 184 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); |
| 185 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); |
| 186 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 187 | |
| 188 | omap_port->wktest = !!enable; |
| 189 | if (omap_port->wktest) { |
| 190 | pm_runtime_get_sync(ssi->device.parent); |
| 191 | writel_relaxed(SSI_WAKE(0), |
| 192 | omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); |
| 193 | } else { |
| 194 | writel_relaxed(SSI_WAKE(0), |
| 195 | omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); |
Sebastian Reichel | ea88f71 | 2016-06-17 20:59:46 +0200 | [diff] [blame] | 196 | pm_runtime_put(ssi->device.parent); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 197 | } |
| 198 | } |
| 199 | EXPORT_SYMBOL_GPL(ssi_waketest); |
| 200 | |
| 201 | static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) |
| 202 | { |
| 203 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 204 | struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; |
| 205 | struct hsi_port *port = to_hsi_port(msg->cl->device.parent); |
| 206 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); |
| 207 | unsigned int dir; |
| 208 | u32 csr; |
| 209 | u32 val; |
| 210 | |
| 211 | spin_lock(&omap_ssi->lock); |
| 212 | |
| 213 | val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); |
| 214 | val &= ~SSI_GDD_LCH(lch); |
| 215 | writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); |
| 216 | |
| 217 | if (msg->ttype == HSI_MSG_READ) { |
| 218 | dir = DMA_FROM_DEVICE; |
| 219 | val = SSI_DATAAVAILABLE(msg->channel); |
Sebastian Reichel | ea88f71 | 2016-06-17 20:59:46 +0200 | [diff] [blame] | 220 | pm_runtime_put(omap_port->pdev); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 221 | } else { |
| 222 | dir = DMA_TO_DEVICE; |
| 223 | val = SSI_DATAACCEPT(msg->channel); |
| 224 | /* Keep clocks reference for write pio event */ |
| 225 | } |
| 226 | dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); |
| 227 | csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); |
| 228 | omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ |
| 229 | dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", |
| 230 | msg->channel, msg->ttype); |
| 231 | spin_unlock(&omap_ssi->lock); |
| 232 | if (csr & SSI_CSR_TOUR) { /* Timeout error */ |
| 233 | msg->status = HSI_STATUS_ERROR; |
| 234 | msg->actual_len = 0; |
| 235 | spin_lock(&omap_port->lock); |
| 236 | list_del(&msg->link); /* Dequeue msg */ |
| 237 | spin_unlock(&omap_port->lock); |
Sebastian Reichel | 4e55231 | 2016-05-20 06:25:06 +0200 | [diff] [blame] | 238 | |
| 239 | list_add_tail(&msg->link, &omap_port->errqueue); |
| 240 | schedule_delayed_work(&omap_port->errqueue_work, 0); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 241 | return; |
| 242 | } |
| 243 | spin_lock(&omap_port->lock); |
| 244 | val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); |
| 245 | writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); |
| 246 | spin_unlock(&omap_port->lock); |
| 247 | |
| 248 | msg->status = HSI_STATUS_COMPLETED; |
| 249 | msg->actual_len = sg_dma_len(msg->sgt.sgl); |
| 250 | } |
| 251 | |
| 252 | static void ssi_gdd_tasklet(unsigned long dev) |
| 253 | { |
| 254 | struct hsi_controller *ssi = (struct hsi_controller *)dev; |
| 255 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 256 | void __iomem *sys = omap_ssi->sys; |
| 257 | unsigned int lch; |
| 258 | u32 status_reg; |
| 259 | |
Sebastian Reichel | 927d3f8 | 2016-06-17 21:01:36 +0200 | [diff] [blame] | 260 | pm_runtime_get(ssi->device.parent); |
| 261 | |
| 262 | if (!pm_runtime_active(ssi->device.parent)) { |
| 263 | dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); |
| 264 | pm_runtime_put(ssi->device.parent); |
| 265 | return; |
| 266 | } |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 267 | |
| 268 | status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); |
| 269 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { |
| 270 | if (status_reg & SSI_GDD_LCH(lch)) |
| 271 | ssi_gdd_complete(ssi, lch); |
| 272 | } |
| 273 | writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); |
| 274 | status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); |
| 275 | |
Sebastian Reichel | ea88f71 | 2016-06-17 20:59:46 +0200 | [diff] [blame] | 276 | pm_runtime_put(ssi->device.parent); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 277 | |
| 278 | if (status_reg) |
| 279 | tasklet_hi_schedule(&omap_ssi->gdd_tasklet); |
| 280 | else |
| 281 | enable_irq(omap_ssi->gdd_irq); |
| 282 | |
| 283 | } |
| 284 | |
| 285 | static irqreturn_t ssi_gdd_isr(int irq, void *ssi) |
| 286 | { |
| 287 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 288 | |
| 289 | tasklet_hi_schedule(&omap_ssi->gdd_tasklet); |
| 290 | disable_irq_nosync(irq); |
| 291 | |
| 292 | return IRQ_HANDLED; |
| 293 | } |
| 294 | |
| 295 | static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) |
| 296 | { |
| 297 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 298 | unsigned long rate = clk_get_rate(omap_ssi->fck); |
| 299 | return rate; |
| 300 | } |
| 301 | |
Sebastian Reichel | 4bcf741 | 2016-01-31 01:52:38 +0100 | [diff] [blame] | 302 | static int ssi_clk_event(struct notifier_block *nb, unsigned long event, |
| 303 | void *data) |
| 304 | { |
| 305 | struct omap_ssi_controller *omap_ssi = container_of(nb, |
| 306 | struct omap_ssi_controller, fck_nb); |
| 307 | struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); |
| 308 | struct clk_notifier_data *clk_data = data; |
| 309 | struct omap_ssi_port *omap_port; |
| 310 | int i; |
| 311 | |
| 312 | switch (event) { |
| 313 | case PRE_RATE_CHANGE: |
| 314 | dev_dbg(&ssi->device, "pre rate change\n"); |
| 315 | |
| 316 | for (i = 0; i < ssi->num_ports; i++) { |
| 317 | omap_port = omap_ssi->port[i]; |
| 318 | |
| 319 | if (!omap_port) |
| 320 | continue; |
| 321 | |
| 322 | /* Workaround for SWBREAK + CAwake down race in CMT */ |
Sebastian Reichel | cb70e4c | 2016-04-30 16:34:43 +0200 | [diff] [blame] | 323 | disable_irq(omap_port->wake_irq); |
Sebastian Reichel | 4bcf741 | 2016-01-31 01:52:38 +0100 | [diff] [blame] | 324 | |
| 325 | /* stop all ssi communication */ |
| 326 | pinctrl_pm_select_idle_state(omap_port->pdev); |
| 327 | udelay(1); /* wait for racing frames */ |
| 328 | } |
| 329 | |
| 330 | break; |
| 331 | case ABORT_RATE_CHANGE: |
| 332 | dev_dbg(&ssi->device, "abort rate change\n"); |
| 333 | /* Fall through */ |
| 334 | case POST_RATE_CHANGE: |
| 335 | dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", |
| 336 | clk_data->old_rate, clk_data->new_rate); |
| 337 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* KHz */ |
| 338 | |
| 339 | for (i = 0; i < ssi->num_ports; i++) { |
| 340 | omap_port = omap_ssi->port[i]; |
| 341 | |
| 342 | if (!omap_port) |
| 343 | continue; |
| 344 | |
| 345 | omap_ssi_port_update_fclk(ssi, omap_port); |
| 346 | |
| 347 | /* resume ssi communication */ |
| 348 | pinctrl_pm_select_default_state(omap_port->pdev); |
Sebastian Reichel | cb70e4c | 2016-04-30 16:34:43 +0200 | [diff] [blame] | 349 | enable_irq(omap_port->wake_irq); |
Sebastian Reichel | 4bcf741 | 2016-01-31 01:52:38 +0100 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | break; |
| 353 | default: |
| 354 | break; |
| 355 | } |
| 356 | |
| 357 | return NOTIFY_DONE; |
| 358 | } |
| 359 | |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 360 | static int ssi_get_iomem(struct platform_device *pd, |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 361 | const char *name, void __iomem **pbase, dma_addr_t *phy) |
| 362 | { |
| 363 | struct resource *mem; |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 364 | void __iomem *base; |
| 365 | struct hsi_controller *ssi = platform_get_drvdata(pd); |
| 366 | |
| 367 | mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); |
Sanjeev Sharma | 16bd586 | 2015-10-29 15:34:55 +0530 | [diff] [blame] | 368 | base = devm_ioremap_resource(&ssi->device, mem); |
| 369 | if (IS_ERR(base)) |
| 370 | return PTR_ERR(base); |
| 371 | |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 372 | *pbase = base; |
| 373 | |
| 374 | if (phy) |
| 375 | *phy = mem->start; |
| 376 | |
| 377 | return 0; |
| 378 | } |
| 379 | |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 380 | static int ssi_add_controller(struct hsi_controller *ssi, |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 381 | struct platform_device *pd) |
| 382 | { |
| 383 | struct omap_ssi_controller *omap_ssi; |
| 384 | int err; |
| 385 | |
| 386 | omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); |
| 387 | if (!omap_ssi) { |
| 388 | dev_err(&pd->dev, "not enough memory for omap ssi\n"); |
| 389 | return -ENOMEM; |
| 390 | } |
| 391 | |
Andrzej Hajda | 6bf6ded | 2015-09-21 15:33:43 +0200 | [diff] [blame] | 392 | err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); |
| 393 | if (err < 0) |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 394 | goto out_err; |
Andrzej Hajda | 6bf6ded | 2015-09-21 15:33:43 +0200 | [diff] [blame] | 395 | ssi->id = err; |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 396 | |
| 397 | ssi->owner = THIS_MODULE; |
| 398 | ssi->device.parent = &pd->dev; |
| 399 | dev_set_name(&ssi->device, "ssi%d", ssi->id); |
| 400 | hsi_controller_set_drvdata(ssi, omap_ssi); |
| 401 | omap_ssi->dev = &ssi->device; |
| 402 | err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); |
| 403 | if (err < 0) |
| 404 | goto out_err; |
| 405 | err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); |
| 406 | if (err < 0) |
| 407 | goto out_err; |
Andrey Utkin | b74d495 | 2014-07-17 16:53:54 +0300 | [diff] [blame] | 408 | err = platform_get_irq_byname(pd, "gdd_mpu"); |
| 409 | if (err < 0) { |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 410 | dev_err(&pd->dev, "GDD IRQ resource missing\n"); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 411 | goto out_err; |
| 412 | } |
Andrey Utkin | b74d495 | 2014-07-17 16:53:54 +0300 | [diff] [blame] | 413 | omap_ssi->gdd_irq = err; |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 414 | tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, |
| 415 | (unsigned long)ssi); |
| 416 | err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, |
| 417 | 0, "gdd_mpu", ssi); |
| 418 | if (err < 0) { |
| 419 | dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", |
| 420 | omap_ssi->gdd_irq, err); |
| 421 | goto out_err; |
| 422 | } |
| 423 | |
| 424 | omap_ssi->port = devm_kzalloc(&ssi->device, |
| 425 | sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL); |
| 426 | if (!omap_ssi->port) { |
| 427 | err = -ENOMEM; |
| 428 | goto out_err; |
| 429 | } |
| 430 | |
| 431 | omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); |
| 432 | if (IS_ERR(omap_ssi->fck)) { |
| 433 | dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", |
| 434 | PTR_ERR(omap_ssi->fck)); |
| 435 | err = -ENODEV; |
| 436 | goto out_err; |
| 437 | } |
| 438 | |
Sebastian Reichel | 4bcf741 | 2016-01-31 01:52:38 +0100 | [diff] [blame] | 439 | omap_ssi->fck_nb.notifier_call = ssi_clk_event; |
| 440 | omap_ssi->fck_nb.priority = INT_MAX; |
| 441 | clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); |
| 442 | |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 443 | /* TODO: find register, which can be used to detect context loss */ |
| 444 | omap_ssi->get_loss = NULL; |
| 445 | |
| 446 | omap_ssi->max_speed = UINT_MAX; |
| 447 | spin_lock_init(&omap_ssi->lock); |
| 448 | err = hsi_register_controller(ssi); |
| 449 | |
| 450 | if (err < 0) |
| 451 | goto out_err; |
| 452 | |
| 453 | return 0; |
| 454 | |
| 455 | out_err: |
| 456 | ida_simple_remove(&platform_omap_ssi_ida, ssi->id); |
| 457 | return err; |
| 458 | } |
| 459 | |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 460 | static int ssi_hw_init(struct hsi_controller *ssi) |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 461 | { |
| 462 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 463 | int err; |
| 464 | |
| 465 | err = pm_runtime_get_sync(ssi->device.parent); |
| 466 | if (err < 0) { |
| 467 | dev_err(&ssi->device, "runtime PM failed %d\n", err); |
| 468 | return err; |
| 469 | } |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 470 | /* Reseting GDD */ |
| 471 | writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); |
| 472 | /* Get FCK rate in KHz */ |
| 473 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); |
| 474 | dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate); |
Sebastian Reichel | b6616be | 2016-04-30 16:23:12 +0200 | [diff] [blame] | 475 | |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 476 | writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); |
| 477 | omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; |
| 478 | pm_runtime_put_sync(ssi->device.parent); |
| 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static void ssi_remove_controller(struct hsi_controller *ssi) |
| 484 | { |
| 485 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 486 | int id = ssi->id; |
| 487 | tasklet_kill(&omap_ssi->gdd_tasklet); |
| 488 | hsi_unregister_controller(ssi); |
Sebastian Reichel | 4bcf741 | 2016-01-31 01:52:38 +0100 | [diff] [blame] | 489 | clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 490 | ida_simple_remove(&platform_omap_ssi_ida, id); |
| 491 | } |
| 492 | |
| 493 | static inline int ssi_of_get_available_ports_count(const struct device_node *np) |
| 494 | { |
| 495 | struct device_node *child; |
| 496 | int num = 0; |
| 497 | |
| 498 | for_each_available_child_of_node(np, child) |
| 499 | if (of_device_is_compatible(child, "ti,omap3-ssi-port")) |
| 500 | num++; |
| 501 | |
| 502 | return num; |
| 503 | } |
| 504 | |
| 505 | static int ssi_remove_ports(struct device *dev, void *c) |
| 506 | { |
| 507 | struct platform_device *pdev = to_platform_device(dev); |
| 508 | |
Sebastian Reichel | 2a57aba | 2016-04-30 03:23:27 +0200 | [diff] [blame] | 509 | if (!dev->of_node) |
| 510 | return 0; |
| 511 | |
| 512 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 513 | of_device_unregister(pdev); |
| 514 | |
| 515 | return 0; |
| 516 | } |
| 517 | |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 518 | static int ssi_probe(struct platform_device *pd) |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 519 | { |
| 520 | struct platform_device *childpdev; |
| 521 | struct device_node *np = pd->dev.of_node; |
| 522 | struct device_node *child; |
| 523 | struct hsi_controller *ssi; |
| 524 | int err; |
| 525 | int num_ports; |
| 526 | |
| 527 | if (!np) { |
| 528 | dev_err(&pd->dev, "missing device tree data\n"); |
| 529 | return -EINVAL; |
| 530 | } |
| 531 | |
| 532 | num_ports = ssi_of_get_available_ports_count(np); |
| 533 | |
| 534 | ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); |
| 535 | if (!ssi) { |
| 536 | dev_err(&pd->dev, "No memory for controller\n"); |
| 537 | return -ENOMEM; |
| 538 | } |
| 539 | |
| 540 | platform_set_drvdata(pd, ssi); |
| 541 | |
| 542 | err = ssi_add_controller(ssi, pd); |
| 543 | if (err < 0) |
| 544 | goto out1; |
| 545 | |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 546 | pm_runtime_enable(&pd->dev); |
| 547 | |
| 548 | err = ssi_hw_init(ssi); |
| 549 | if (err < 0) |
| 550 | goto out2; |
| 551 | #ifdef CONFIG_DEBUG_FS |
| 552 | err = ssi_debug_add_ctrl(ssi); |
| 553 | if (err < 0) |
| 554 | goto out2; |
| 555 | #endif |
| 556 | |
| 557 | for_each_available_child_of_node(np, child) { |
| 558 | if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) |
| 559 | continue; |
| 560 | |
| 561 | childpdev = of_platform_device_create(child, NULL, &pd->dev); |
| 562 | if (!childpdev) { |
| 563 | err = -ENODEV; |
| 564 | dev_err(&pd->dev, "failed to create ssi controller port\n"); |
| 565 | goto out3; |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", |
| 570 | ssi->id, num_ports); |
| 571 | return err; |
| 572 | out3: |
| 573 | device_for_each_child(&pd->dev, NULL, ssi_remove_ports); |
| 574 | out2: |
| 575 | ssi_remove_controller(ssi); |
| 576 | out1: |
| 577 | platform_set_drvdata(pd, NULL); |
| 578 | pm_runtime_disable(&pd->dev); |
| 579 | |
| 580 | return err; |
| 581 | } |
| 582 | |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 583 | static int ssi_remove(struct platform_device *pd) |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 584 | { |
| 585 | struct hsi_controller *ssi = platform_get_drvdata(pd); |
| 586 | |
Sebastian Reichel | f704e11 | 2016-04-30 00:07:35 +0200 | [diff] [blame] | 587 | /* cleanup of of_platform_populate() call */ |
| 588 | device_for_each_child(&pd->dev, NULL, ssi_remove_ports); |
| 589 | |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 590 | #ifdef CONFIG_DEBUG_FS |
| 591 | ssi_debug_remove_ctrl(ssi); |
| 592 | #endif |
| 593 | ssi_remove_controller(ssi); |
| 594 | platform_set_drvdata(pd, NULL); |
| 595 | |
| 596 | pm_runtime_disable(&pd->dev); |
| 597 | |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 598 | return 0; |
| 599 | } |
| 600 | |
Rafael J. Wysocki | 96a1c18 | 2014-12-04 01:07:01 +0100 | [diff] [blame] | 601 | #ifdef CONFIG_PM |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 602 | static int omap_ssi_runtime_suspend(struct device *dev) |
| 603 | { |
| 604 | struct hsi_controller *ssi = dev_get_drvdata(dev); |
| 605 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 606 | |
| 607 | dev_dbg(dev, "runtime suspend!\n"); |
| 608 | |
| 609 | if (omap_ssi->get_loss) |
| 610 | omap_ssi->loss_count = |
| 611 | omap_ssi->get_loss(ssi->device.parent); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static int omap_ssi_runtime_resume(struct device *dev) |
| 617 | { |
| 618 | struct hsi_controller *ssi = dev_get_drvdata(dev); |
| 619 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); |
| 620 | |
| 621 | dev_dbg(dev, "runtime resume!\n"); |
| 622 | |
| 623 | if ((omap_ssi->get_loss) && (omap_ssi->loss_count == |
| 624 | omap_ssi->get_loss(ssi->device.parent))) |
| 625 | return 0; |
| 626 | |
| 627 | writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); |
| 628 | |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | static const struct dev_pm_ops omap_ssi_pm_ops = { |
| 633 | SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, |
| 634 | NULL) |
| 635 | }; |
| 636 | |
| 637 | #define DEV_PM_OPS (&omap_ssi_pm_ops) |
| 638 | #else |
| 639 | #define DEV_PM_OPS NULL |
| 640 | #endif |
| 641 | |
| 642 | #ifdef CONFIG_OF |
| 643 | static const struct of_device_id omap_ssi_of_match[] = { |
| 644 | { .compatible = "ti,omap3-ssi", }, |
| 645 | {}, |
| 646 | }; |
| 647 | MODULE_DEVICE_TABLE(of, omap_ssi_of_match); |
| 648 | #else |
| 649 | #define omap_ssi_of_match NULL |
| 650 | #endif |
| 651 | |
| 652 | static struct platform_driver ssi_pdriver = { |
Sebastian Reichel | 0845e1f2 | 2016-04-30 01:01:06 +0200 | [diff] [blame] | 653 | .probe = ssi_probe, |
| 654 | .remove = ssi_remove, |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 655 | .driver = { |
| 656 | .name = "omap_ssi", |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 657 | .pm = DEV_PM_OPS, |
| 658 | .of_match_table = omap_ssi_of_match, |
| 659 | }, |
| 660 | }; |
| 661 | |
Sebastian Reichel | 0fae198 | 2016-04-30 03:24:09 +0200 | [diff] [blame] | 662 | static int __init ssi_init(void) { |
| 663 | int ret; |
| 664 | |
| 665 | ret = platform_driver_register(&ssi_pdriver); |
| 666 | if (ret) |
| 667 | return ret; |
| 668 | |
| 669 | return platform_driver_register(&ssi_port_pdriver); |
| 670 | } |
| 671 | module_init(ssi_init); |
| 672 | |
| 673 | static void __exit ssi_exit(void) { |
| 674 | platform_driver_unregister(&ssi_port_pdriver); |
| 675 | platform_driver_unregister(&ssi_pdriver); |
| 676 | } |
| 677 | module_exit(ssi_exit); |
Sebastian Reichel | b209e04 | 2013-12-15 23:38:58 +0100 | [diff] [blame] | 678 | |
| 679 | MODULE_ALIAS("platform:omap_ssi"); |
| 680 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); |
| 681 | MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); |
| 682 | MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); |
| 683 | MODULE_LICENSE("GPL v2"); |