1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ST EHCI driver 4 * 5 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved 6 * 7 * Author: Peter Griffin <peter.griffin@linaro.org> 8 * 9 * Derived from ehci-platform.c 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/dma-mapping.h> 14 #include <linux/err.h> 15 #include <linux/kernel.h> 16 #include <linux/hrtimer.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/phy/phy.h> 21 #include <linux/platform_device.h> 22 #include <linux/reset.h> 23 #include <linux/usb.h> 24 #include <linux/usb/hcd.h> 25 #include <linux/usb/ehci_pdriver.h> 26 #include <linux/pinctrl/consumer.h> 27 28 #include "ehci.h" 29 30 #define USB_MAX_CLKS 3 31 32 struct st_ehci_platform_priv { 33 struct clk *clks[USB_MAX_CLKS]; 34 struct clk *clk48; 35 struct reset_control *rst; 36 struct reset_control *pwr; 37 struct phy *phy; 38 }; 39 40 #define DRIVER_DESC "EHCI STMicroelectronics driver" 41 42 #define hcd_to_ehci_priv(h) \ 43 ((struct st_ehci_platform_priv *)hcd_to_ehci(h)->priv) 44 45 #define EHCI_CAPS_SIZE 0x10 46 #define AHB2STBUS_INSREG01 (EHCI_CAPS_SIZE + 0x84) 47 48 static int st_ehci_platform_reset(struct usb_hcd *hcd) 49 { 50 struct platform_device *pdev = to_platform_device(hcd->self.controller); 51 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev); 52 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 53 u32 threshold; 54 55 /* Set EHCI packet buffer IN/OUT threshold to 128 bytes */ 56 threshold = 128 | (128 << 16); 57 writel(threshold, hcd->regs + AHB2STBUS_INSREG01); 58 59 ehci->caps = hcd->regs + pdata->caps_offset; 60 return ehci_setup(hcd); 61 } 62 63 static int st_ehci_platform_power_on(struct platform_device *dev) 64 { 65 struct usb_hcd *hcd = platform_get_drvdata(dev); 66 struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 67 int clk, ret; 68 69 ret = reset_control_deassert(priv->pwr); 70 if (ret) 71 return ret; 72 73 ret = reset_control_deassert(priv->rst); 74 if (ret) 75 goto err_assert_power; 76 77 /* some SoCs don't have a dedicated 48Mhz clock, but those that do 78 need the rate to be explicitly set */ 79 if (priv->clk48) { 80 ret = clk_set_rate(priv->clk48, 48000000); 81 if (ret) 82 goto err_assert_reset; 83 } 84 85 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) { 86 ret = clk_prepare_enable(priv->clks[clk]); 87 if (ret) 88 goto err_disable_clks; 89 } 90 91 ret = phy_init(priv->phy); 92 if (ret) 93 goto err_disable_clks; 94 95 ret = phy_power_on(priv->phy); 96 if (ret) 97 goto err_exit_phy; 98 99 return 0; 100 101 err_exit_phy: 102 phy_exit(priv->phy); 103 err_disable_clks: 104 while (--clk >= 0) 105 clk_disable_unprepare(priv->clks[clk]); 106 err_assert_reset: 107 reset_control_assert(priv->rst); 108 err_assert_power: 109 reset_control_assert(priv->pwr); 110 111 return ret; 112 } 113 114 static void st_ehci_platform_power_off(struct platform_device *dev) 115 { 116 struct usb_hcd *hcd = platform_get_drvdata(dev); 117 struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 118 int clk; 119 120 reset_control_assert(priv->pwr); 121 122 reset_control_assert(priv->rst); 123 124 phy_power_off(priv->phy); 125 126 phy_exit(priv->phy); 127 128 for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--) 129 if (priv->clks[clk]) 130 clk_disable_unprepare(priv->clks[clk]); 131 132 } 133 134 static struct hc_driver __read_mostly ehci_platform_hc_driver; 135 136 static const struct ehci_driver_overrides platform_overrides __initconst = { 137 .reset = st_ehci_platform_reset, 138 .extra_priv_size = sizeof(struct st_ehci_platform_priv), 139 }; 140 141 static struct usb_ehci_pdata ehci_platform_defaults = { 142 .power_on = st_ehci_platform_power_on, 143 .power_suspend = st_ehci_platform_power_off, 144 .power_off = st_ehci_platform_power_off, 145 }; 146 147 static int st_ehci_platform_probe(struct platform_device *dev) 148 { 149 struct usb_hcd *hcd; 150 struct resource *res_mem; 151 struct usb_ehci_pdata *pdata = &ehci_platform_defaults; 152 struct st_ehci_platform_priv *priv; 153 int err, irq, clk = 0; 154 155 if (usb_disabled()) 156 return -ENODEV; 157 158 irq = platform_get_irq(dev, 0); 159 if (irq < 0) 160 return irq; 161 162 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev, 163 dev_name(&dev->dev)); 164 if (!hcd) 165 return -ENOMEM; 166 167 platform_set_drvdata(dev, hcd); 168 dev->dev.platform_data = pdata; 169 priv = hcd_to_ehci_priv(hcd); 170 171 priv->phy = devm_phy_get(&dev->dev, "usb"); 172 if (IS_ERR(priv->phy)) { 173 err = PTR_ERR(priv->phy); 174 goto err_put_hcd; 175 } 176 177 for (clk = 0; clk < USB_MAX_CLKS; clk++) { 178 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); 179 if (IS_ERR(priv->clks[clk])) { 180 err = PTR_ERR(priv->clks[clk]); 181 if (err == -EPROBE_DEFER) 182 goto err_put_clks; 183 priv->clks[clk] = NULL; 184 break; 185 } 186 } 187 188 /* some SoCs don't have a dedicated 48Mhz clock, but those that 189 do need the rate to be explicitly set */ 190 priv->clk48 = devm_clk_get(&dev->dev, "clk48"); 191 if (IS_ERR(priv->clk48)) { 192 dev_info(&dev->dev, "48MHz clk not found\n"); 193 priv->clk48 = NULL; 194 } 195 196 priv->pwr = 197 devm_reset_control_get_optional_shared(&dev->dev, "power"); 198 if (IS_ERR(priv->pwr)) { 199 err = PTR_ERR(priv->pwr); 200 if (err == -EPROBE_DEFER) 201 goto err_put_clks; 202 priv->pwr = NULL; 203 } 204 205 priv->rst = 206 devm_reset_control_get_optional_shared(&dev->dev, "softreset"); 207 if (IS_ERR(priv->rst)) { 208 err = PTR_ERR(priv->rst); 209 if (err == -EPROBE_DEFER) 210 goto err_put_clks; 211 priv->rst = NULL; 212 } 213 214 if (pdata->power_on) { 215 err = pdata->power_on(dev); 216 if (err < 0) 217 goto err_put_clks; 218 } 219 220 hcd->regs = devm_platform_get_and_ioremap_resource(dev, 0, &res_mem); 221 if (IS_ERR(hcd->regs)) { 222 err = PTR_ERR(hcd->regs); 223 goto err_put_clks; 224 } 225 hcd->rsrc_start = res_mem->start; 226 hcd->rsrc_len = resource_size(res_mem); 227 228 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 229 if (err) 230 goto err_put_clks; 231 232 device_wakeup_enable(hcd->self.controller); 233 platform_set_drvdata(dev, hcd); 234 235 return err; 236 237 err_put_clks: 238 while (--clk >= 0) 239 clk_put(priv->clks[clk]); 240 err_put_hcd: 241 if (pdata == &ehci_platform_defaults) 242 dev->dev.platform_data = NULL; 243 244 usb_put_hcd(hcd); 245 246 return err; 247 } 248 249 static void st_ehci_platform_remove(struct platform_device *dev) 250 { 251 struct usb_hcd *hcd = platform_get_drvdata(dev); 252 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 253 struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 254 int clk; 255 256 usb_remove_hcd(hcd); 257 258 if (pdata->power_off) 259 pdata->power_off(dev); 260 261 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) 262 clk_put(priv->clks[clk]); 263 264 usb_put_hcd(hcd); 265 266 if (pdata == &ehci_platform_defaults) 267 dev->dev.platform_data = NULL; 268 } 269 270 #ifdef CONFIG_PM_SLEEP 271 272 static int st_ehci_suspend(struct device *dev) 273 { 274 struct usb_hcd *hcd = dev_get_drvdata(dev); 275 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 276 struct platform_device *pdev = to_platform_device(dev); 277 bool do_wakeup = device_may_wakeup(dev); 278 int ret; 279 280 ret = ehci_suspend(hcd, do_wakeup); 281 if (ret) 282 return ret; 283 284 if (pdata->power_suspend) 285 pdata->power_suspend(pdev); 286 287 pinctrl_pm_select_sleep_state(dev); 288 289 return ret; 290 } 291 292 static int st_ehci_resume(struct device *dev) 293 { 294 struct usb_hcd *hcd = dev_get_drvdata(dev); 295 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 296 struct platform_device *pdev = to_platform_device(dev); 297 int err; 298 299 pinctrl_pm_select_default_state(dev); 300 301 if (pdata->power_on) { 302 err = pdata->power_on(pdev); 303 if (err < 0) 304 return err; 305 } 306 307 ehci_resume(hcd, false); 308 return 0; 309 } 310 311 static SIMPLE_DEV_PM_OPS(st_ehci_pm_ops, st_ehci_suspend, st_ehci_resume); 312 313 #endif /* CONFIG_PM_SLEEP */ 314 315 static const struct of_device_id st_ehci_ids[] = { 316 { .compatible = "st,st-ehci-300x", }, 317 { /* sentinel */ } 318 }; 319 MODULE_DEVICE_TABLE(of, st_ehci_ids); 320 321 static struct platform_driver ehci_platform_driver = { 322 .probe = st_ehci_platform_probe, 323 .remove_new = st_ehci_platform_remove, 324 .shutdown = usb_hcd_platform_shutdown, 325 .driver = { 326 .name = "st-ehci", 327 #ifdef CONFIG_PM_SLEEP 328 .pm = &st_ehci_pm_ops, 329 #endif 330 .of_match_table = st_ehci_ids, 331 } 332 }; 333 334 static int __init ehci_platform_init(void) 335 { 336 if (usb_disabled()) 337 return -ENODEV; 338 339 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); 340 return platform_driver_register(&ehci_platform_driver); 341 } 342 module_init(ehci_platform_init); 343 344 static void __exit ehci_platform_cleanup(void) 345 { 346 platform_driver_unregister(&ehci_platform_driver); 347 } 348 module_exit(ehci_platform_cleanup); 349 350 MODULE_DESCRIPTION(DRIVER_DESC); 351 MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>"); 352 MODULE_LICENSE("GPL"); 353