1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2010 ST-Ericsson AB 4 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> 5 * 6 * Based on omap2430.c 7 */ 8 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/clk.h> 12 #include <linux/err.h> 13 #include <linux/io.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/usb/musb-ux500.h> 17 18 #include "musb_core.h" 19 20 static const struct musb_hdrc_config ux500_musb_hdrc_config = { 21 .multipoint = true, 22 .dyn_fifo = true, 23 .num_eps = 16, 24 .ram_bits = 16, 25 }; 26 27 struct ux500_glue { 28 struct device *dev; 29 struct platform_device *musb; 30 struct clk *clk; 31 }; 32 #define glue_to_musb(g) platform_get_drvdata(g->musb) 33 34 static void ux500_musb_set_vbus(struct musb *musb, int is_on) 35 { 36 u8 devctl; 37 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 38 /* HDRC controls CPEN, but beware current surges during device 39 * connect. They can trigger transient overcurrent conditions 40 * that must be ignored. 41 */ 42 43 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 44 45 if (is_on) { 46 if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) { 47 /* start the session */ 48 devctl |= MUSB_DEVCTL_SESSION; 49 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 50 /* 51 * Wait for the musb to set as A device to enable the 52 * VBUS 53 */ 54 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { 55 56 if (time_after(jiffies, timeout)) { 57 dev_err(musb->controller, 58 "configured as A device timeout"); 59 break; 60 } 61 } 62 63 } else { 64 musb->is_active = 1; 65 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 66 devctl |= MUSB_DEVCTL_SESSION; 67 MUSB_HST_MODE(musb); 68 } 69 } else { 70 musb->is_active = 0; 71 72 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping 73 * right to B_IDLE... 74 */ 75 devctl &= ~MUSB_DEVCTL_SESSION; 76 MUSB_DEV_MODE(musb); 77 } 78 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 79 80 /* 81 * Devctl values will be updated after vbus goes below 82 * session_valid. The time taken depends on the capacitance 83 * on VBUS line. The max discharge time can be upto 1 sec 84 * as per the spec. Typically on our platform, it is 200ms 85 */ 86 if (!is_on) 87 mdelay(200); 88 89 dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", 90 usb_otg_state_string(musb->xceiv->otg->state), 91 musb_readb(musb->mregs, MUSB_DEVCTL)); 92 } 93 94 static int musb_otg_notifications(struct notifier_block *nb, 95 unsigned long event, void *unused) 96 { 97 struct musb *musb = container_of(nb, struct musb, nb); 98 99 dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n", 100 event, usb_otg_state_string(musb->xceiv->otg->state)); 101 102 switch (event) { 103 case UX500_MUSB_ID: 104 dev_dbg(musb->controller, "ID GND\n"); 105 ux500_musb_set_vbus(musb, 1); 106 break; 107 case UX500_MUSB_VBUS: 108 dev_dbg(musb->controller, "VBUS Connect\n"); 109 break; 110 case UX500_MUSB_NONE: 111 dev_dbg(musb->controller, "VBUS Disconnect\n"); 112 if (is_host_active(musb)) 113 ux500_musb_set_vbus(musb, 0); 114 else 115 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 116 break; 117 default: 118 dev_dbg(musb->controller, "ID float\n"); 119 return NOTIFY_DONE; 120 } 121 return NOTIFY_OK; 122 } 123 124 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci) 125 { 126 unsigned long flags; 127 irqreturn_t retval = IRQ_NONE; 128 struct musb *musb = __hci; 129 130 spin_lock_irqsave(&musb->lock, flags); 131 132 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 133 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 134 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 135 136 if (musb->int_usb || musb->int_tx || musb->int_rx) 137 retval = musb_interrupt(musb); 138 139 spin_unlock_irqrestore(&musb->lock, flags); 140 141 return retval; 142 } 143 144 static int ux500_musb_init(struct musb *musb) 145 { 146 int status; 147 148 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 149 if (IS_ERR_OR_NULL(musb->xceiv)) { 150 pr_err("HS USB OTG: no transceiver configured\n"); 151 return -EPROBE_DEFER; 152 } 153 154 musb->nb.notifier_call = musb_otg_notifications; 155 status = usb_register_notifier(musb->xceiv, &musb->nb); 156 if (status < 0) { 157 dev_dbg(musb->controller, "notification register failed\n"); 158 return status; 159 } 160 161 musb->isr = ux500_musb_interrupt; 162 163 return 0; 164 } 165 166 static int ux500_musb_exit(struct musb *musb) 167 { 168 usb_unregister_notifier(musb->xceiv, &musb->nb); 169 170 usb_put_phy(musb->xceiv); 171 172 return 0; 173 } 174 175 static const struct musb_platform_ops ux500_ops = { 176 .quirks = MUSB_DMA_UX500 | MUSB_INDEXED_EP, 177 #ifdef CONFIG_USB_UX500_DMA 178 .dma_init = ux500_dma_controller_create, 179 .dma_exit = ux500_dma_controller_destroy, 180 #endif 181 .init = ux500_musb_init, 182 .exit = ux500_musb_exit, 183 .fifo_mode = 5, 184 185 .set_vbus = ux500_musb_set_vbus, 186 }; 187 188 static struct musb_hdrc_platform_data * 189 ux500_of_probe(struct platform_device *pdev, struct device_node *np) 190 { 191 struct musb_hdrc_platform_data *pdata; 192 const char *mode; 193 int strlen; 194 195 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 196 if (!pdata) 197 return NULL; 198 199 mode = of_get_property(np, "dr_mode", &strlen); 200 if (!mode) { 201 dev_err(&pdev->dev, "No 'dr_mode' property found\n"); 202 return NULL; 203 } 204 205 if (strlen > 0) { 206 if (!strcmp(mode, "host")) 207 pdata->mode = MUSB_HOST; 208 if (!strcmp(mode, "otg")) 209 pdata->mode = MUSB_OTG; 210 if (!strcmp(mode, "peripheral")) 211 pdata->mode = MUSB_PERIPHERAL; 212 } 213 214 return pdata; 215 } 216 217 static int ux500_probe(struct platform_device *pdev) 218 { 219 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); 220 struct device_node *np = pdev->dev.of_node; 221 struct platform_device *musb; 222 struct ux500_glue *glue; 223 struct clk *clk; 224 int ret = -ENOMEM; 225 226 if (!pdata) { 227 if (np) { 228 pdata = ux500_of_probe(pdev, np); 229 if (!pdata) 230 goto err0; 231 232 pdev->dev.platform_data = pdata; 233 } else { 234 dev_err(&pdev->dev, "no pdata or device tree found\n"); 235 goto err0; 236 } 237 } 238 239 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 240 if (!glue) 241 goto err0; 242 243 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 244 if (!musb) { 245 dev_err(&pdev->dev, "failed to allocate musb device\n"); 246 goto err0; 247 } 248 249 clk = devm_clk_get(&pdev->dev, NULL); 250 if (IS_ERR(clk)) { 251 dev_err(&pdev->dev, "failed to get clock\n"); 252 ret = PTR_ERR(clk); 253 goto err1; 254 } 255 256 ret = clk_prepare_enable(clk); 257 if (ret) { 258 dev_err(&pdev->dev, "failed to enable clock\n"); 259 goto err1; 260 } 261 262 musb->dev.parent = &pdev->dev; 263 musb->dev.dma_mask = &pdev->dev.coherent_dma_mask; 264 musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask; 265 device_set_of_node_from_dev(&musb->dev, &pdev->dev); 266 267 glue->dev = &pdev->dev; 268 glue->musb = musb; 269 glue->clk = clk; 270 271 pdata->platform_ops = &ux500_ops; 272 pdata->config = &ux500_musb_hdrc_config; 273 274 platform_set_drvdata(pdev, glue); 275 276 ret = platform_device_add_resources(musb, pdev->resource, pdev->num_resources); 277 if (ret) { 278 dev_err(&pdev->dev, "failed to add resources\n"); 279 goto err2; 280 } 281 282 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 283 if (ret) { 284 dev_err(&pdev->dev, "failed to add platform_data\n"); 285 goto err2; 286 } 287 288 ret = platform_device_add(musb); 289 if (ret) { 290 dev_err(&pdev->dev, "failed to register musb device\n"); 291 goto err2; 292 } 293 294 return 0; 295 296 err2: 297 clk_disable_unprepare(clk); 298 299 err1: 300 platform_device_put(musb); 301 302 err0: 303 return ret; 304 } 305 306 static void ux500_remove(struct platform_device *pdev) 307 { 308 struct ux500_glue *glue = platform_get_drvdata(pdev); 309 310 platform_device_unregister(glue->musb); 311 clk_disable_unprepare(glue->clk); 312 } 313 314 #ifdef CONFIG_PM_SLEEP 315 static int ux500_suspend(struct device *dev) 316 { 317 struct ux500_glue *glue = dev_get_drvdata(dev); 318 struct musb *musb = glue_to_musb(glue); 319 320 if (musb) 321 usb_phy_set_suspend(musb->xceiv, 1); 322 323 clk_disable_unprepare(glue->clk); 324 325 return 0; 326 } 327 328 static int ux500_resume(struct device *dev) 329 { 330 struct ux500_glue *glue = dev_get_drvdata(dev); 331 struct musb *musb = glue_to_musb(glue); 332 int ret; 333 334 ret = clk_prepare_enable(glue->clk); 335 if (ret) { 336 dev_err(dev, "failed to enable clock\n"); 337 return ret; 338 } 339 340 if (musb) 341 usb_phy_set_suspend(musb->xceiv, 0); 342 343 return 0; 344 } 345 #endif 346 347 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume); 348 349 static const struct of_device_id ux500_match[] = { 350 { .compatible = "stericsson,db8500-musb", }, 351 {} 352 }; 353 354 MODULE_DEVICE_TABLE(of, ux500_match); 355 356 static struct platform_driver ux500_driver = { 357 .probe = ux500_probe, 358 .remove_new = ux500_remove, 359 .driver = { 360 .name = "musb-ux500", 361 .pm = &ux500_pm_ops, 362 .of_match_table = ux500_match, 363 }, 364 }; 365 366 MODULE_DESCRIPTION("UX500 MUSB Glue Layer"); 367 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>"); 368 MODULE_LICENSE("GPL v2"); 369 module_platform_driver(ux500_driver); 370