1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * omap-control-phy.c - The PHY part of control module. 4 * 5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 6 * Author: Kishon Vijay Abraham I <kishon@ti.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/slab.h> 12 #include <linux/of.h> 13 #include <linux/of_device.h> 14 #include <linux/err.h> 15 #include <linux/io.h> 16 #include <linux/clk.h> 17 #include <linux/phy/omap_control_phy.h> 18 19 /** 20 * omap_control_pcie_pcs - set the PCS delay count 21 * @dev: the control module device 22 * @delay: 8 bit delay value 23 */ 24 void omap_control_pcie_pcs(struct device *dev, u8 delay) 25 { 26 u32 val; 27 struct omap_control_phy *control_phy; 28 29 if (IS_ERR(dev) || !dev) { 30 pr_err("%s: invalid device\n", __func__); 31 return; 32 } 33 34 control_phy = dev_get_drvdata(dev); 35 if (!control_phy) { 36 dev_err(dev, "%s: invalid control phy device\n", __func__); 37 return; 38 } 39 40 if (control_phy->type != OMAP_CTRL_TYPE_PCIE) { 41 dev_err(dev, "%s: unsupported operation\n", __func__); 42 return; 43 } 44 45 val = readl(control_phy->pcie_pcs); 46 val &= ~(OMAP_CTRL_PCIE_PCS_MASK << 47 OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT); 48 val |= (delay << OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT); 49 writel(val, control_phy->pcie_pcs); 50 } 51 EXPORT_SYMBOL_GPL(omap_control_pcie_pcs); 52 53 /** 54 * omap_control_phy_power - power on/off the phy using control module reg 55 * @dev: the control module device 56 * @on: 0 or 1, based on powering on or off the PHY 57 */ 58 void omap_control_phy_power(struct device *dev, int on) 59 { 60 u32 val; 61 unsigned long rate; 62 struct omap_control_phy *control_phy; 63 64 if (IS_ERR(dev) || !dev) { 65 pr_err("%s: invalid device\n", __func__); 66 return; 67 } 68 69 control_phy = dev_get_drvdata(dev); 70 if (!control_phy) { 71 dev_err(dev, "%s: invalid control phy device\n", __func__); 72 return; 73 } 74 75 if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) 76 return; 77 78 val = readl(control_phy->power); 79 80 switch (control_phy->type) { 81 case OMAP_CTRL_TYPE_USB2: 82 if (on) 83 val &= ~OMAP_CTRL_DEV_PHY_PD; 84 else 85 val |= OMAP_CTRL_DEV_PHY_PD; 86 break; 87 88 case OMAP_CTRL_TYPE_PCIE: 89 case OMAP_CTRL_TYPE_PIPE3: 90 rate = clk_get_rate(control_phy->sys_clk); 91 rate = rate/1000000; 92 93 if (on) { 94 val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK | 95 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK); 96 val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON << 97 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT; 98 val |= rate << 99 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT; 100 } else { 101 val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK; 102 val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF << 103 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT; 104 } 105 break; 106 107 case OMAP_CTRL_TYPE_DRA7USB2: 108 if (on) 109 val &= ~OMAP_CTRL_USB2_PHY_PD; 110 else 111 val |= OMAP_CTRL_USB2_PHY_PD; 112 break; 113 114 case OMAP_CTRL_TYPE_AM437USB2: 115 if (on) { 116 val &= ~(AM437X_CTRL_USB2_PHY_PD | 117 AM437X_CTRL_USB2_OTG_PD); 118 val |= (AM437X_CTRL_USB2_OTGVDET_EN | 119 AM437X_CTRL_USB2_OTGSESSEND_EN); 120 } else { 121 val &= ~(AM437X_CTRL_USB2_OTGVDET_EN | 122 AM437X_CTRL_USB2_OTGSESSEND_EN); 123 val |= (AM437X_CTRL_USB2_PHY_PD | 124 AM437X_CTRL_USB2_OTG_PD); 125 } 126 break; 127 default: 128 dev_err(dev, "%s: type %d not recognized\n", 129 __func__, control_phy->type); 130 break; 131 } 132 133 writel(val, control_phy->power); 134 } 135 EXPORT_SYMBOL_GPL(omap_control_phy_power); 136 137 /** 138 * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded 139 * @ctrl_phy: struct omap_control_phy * 140 * 141 * Writes to the mailbox register to notify the usb core that a usb 142 * device has been connected. 143 */ 144 static void omap_control_usb_host_mode(struct omap_control_phy *ctrl_phy) 145 { 146 u32 val; 147 148 val = readl(ctrl_phy->otghs_control); 149 val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND); 150 val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID; 151 writel(val, ctrl_phy->otghs_control); 152 } 153 154 /** 155 * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high 156 * impedance 157 * @ctrl_phy: struct omap_control_phy * 158 * 159 * Writes to the mailbox register to notify the usb core that it has been 160 * connected to a usb host. 161 */ 162 static void omap_control_usb_device_mode(struct omap_control_phy *ctrl_phy) 163 { 164 u32 val; 165 166 val = readl(ctrl_phy->otghs_control); 167 val &= ~OMAP_CTRL_DEV_SESSEND; 168 val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID | 169 OMAP_CTRL_DEV_VBUSVALID; 170 writel(val, ctrl_phy->otghs_control); 171 } 172 173 /** 174 * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high 175 * impedance 176 * @ctrl_phy: struct omap_control_phy * 177 * 178 * Writes to the mailbox register to notify the usb core it's now in 179 * disconnected state. 180 */ 181 static void omap_control_usb_set_sessionend(struct omap_control_phy *ctrl_phy) 182 { 183 u32 val; 184 185 val = readl(ctrl_phy->otghs_control); 186 val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID); 187 val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND; 188 writel(val, ctrl_phy->otghs_control); 189 } 190 191 /** 192 * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode 193 * or device mode or to denote disconnected state 194 * @dev: the control module device 195 * @mode: The mode to which usb should be configured 196 * 197 * This is an API to write to the mailbox register to notify the usb core that 198 * a usb device has been connected. 199 */ 200 void omap_control_usb_set_mode(struct device *dev, 201 enum omap_control_usb_mode mode) 202 { 203 struct omap_control_phy *ctrl_phy; 204 205 if (IS_ERR(dev) || !dev) 206 return; 207 208 ctrl_phy = dev_get_drvdata(dev); 209 if (!ctrl_phy) { 210 dev_err(dev, "Invalid control phy device\n"); 211 return; 212 } 213 214 if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS) 215 return; 216 217 switch (mode) { 218 case USB_MODE_HOST: 219 omap_control_usb_host_mode(ctrl_phy); 220 break; 221 case USB_MODE_DEVICE: 222 omap_control_usb_device_mode(ctrl_phy); 223 break; 224 case USB_MODE_DISCONNECT: 225 omap_control_usb_set_sessionend(ctrl_phy); 226 break; 227 default: 228 dev_vdbg(dev, "invalid omap control usb mode\n"); 229 } 230 } 231 EXPORT_SYMBOL_GPL(omap_control_usb_set_mode); 232 233 static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS; 234 static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2; 235 static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3; 236 static const enum omap_control_phy_type pcie_data = OMAP_CTRL_TYPE_PCIE; 237 static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2; 238 static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2; 239 240 static const struct of_device_id omap_control_phy_id_table[] = { 241 { 242 .compatible = "ti,control-phy-otghs", 243 .data = &otghs_data, 244 }, 245 { 246 .compatible = "ti,control-phy-usb2", 247 .data = &usb2_data, 248 }, 249 { 250 .compatible = "ti,control-phy-pipe3", 251 .data = &pipe3_data, 252 }, 253 { 254 .compatible = "ti,control-phy-pcie", 255 .data = &pcie_data, 256 }, 257 { 258 .compatible = "ti,control-phy-usb2-dra7", 259 .data = &dra7usb2_data, 260 }, 261 { 262 .compatible = "ti,control-phy-usb2-am437", 263 .data = &am437usb2_data, 264 }, 265 {}, 266 }; 267 MODULE_DEVICE_TABLE(of, omap_control_phy_id_table); 268 269 static int omap_control_phy_probe(struct platform_device *pdev) 270 { 271 struct resource *res; 272 const struct of_device_id *of_id; 273 struct omap_control_phy *control_phy; 274 275 of_id = of_match_device(omap_control_phy_id_table, &pdev->dev); 276 if (!of_id) 277 return -EINVAL; 278 279 control_phy = devm_kzalloc(&pdev->dev, sizeof(*control_phy), 280 GFP_KERNEL); 281 if (!control_phy) 282 return -ENOMEM; 283 284 control_phy->dev = &pdev->dev; 285 control_phy->type = *(enum omap_control_phy_type *)of_id->data; 286 287 if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) { 288 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 289 "otghs_control"); 290 control_phy->otghs_control = devm_ioremap_resource( 291 &pdev->dev, res); 292 if (IS_ERR(control_phy->otghs_control)) 293 return PTR_ERR(control_phy->otghs_control); 294 } else { 295 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 296 "power"); 297 control_phy->power = devm_ioremap_resource(&pdev->dev, res); 298 if (IS_ERR(control_phy->power)) { 299 dev_err(&pdev->dev, "Couldn't get power register\n"); 300 return PTR_ERR(control_phy->power); 301 } 302 } 303 304 if (control_phy->type == OMAP_CTRL_TYPE_PIPE3 || 305 control_phy->type == OMAP_CTRL_TYPE_PCIE) { 306 control_phy->sys_clk = devm_clk_get(control_phy->dev, 307 "sys_clkin"); 308 if (IS_ERR(control_phy->sys_clk)) { 309 pr_err("%s: unable to get sys_clkin\n", __func__); 310 return -EINVAL; 311 } 312 } 313 314 if (control_phy->type == OMAP_CTRL_TYPE_PCIE) { 315 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 316 "pcie_pcs"); 317 control_phy->pcie_pcs = devm_ioremap_resource(&pdev->dev, res); 318 if (IS_ERR(control_phy->pcie_pcs)) 319 return PTR_ERR(control_phy->pcie_pcs); 320 } 321 322 dev_set_drvdata(control_phy->dev, control_phy); 323 324 return 0; 325 } 326 327 static struct platform_driver omap_control_phy_driver = { 328 .probe = omap_control_phy_probe, 329 .driver = { 330 .name = "omap-control-phy", 331 .of_match_table = omap_control_phy_id_table, 332 }, 333 }; 334 335 static int __init omap_control_phy_init(void) 336 { 337 return platform_driver_register(&omap_control_phy_driver); 338 } 339 subsys_initcall(omap_control_phy_init); 340 341 static void __exit omap_control_phy_exit(void) 342 { 343 platform_driver_unregister(&omap_control_phy_driver); 344 } 345 module_exit(omap_control_phy_exit); 346 347 MODULE_ALIAS("platform:omap_control_phy"); 348 MODULE_AUTHOR("Texas Instruments Inc."); 349 MODULE_DESCRIPTION("OMAP Control Module PHY Driver"); 350 MODULE_LICENSE("GPL v2"); 351