1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2021 Marvell 4 * 5 * Authors: 6 * Konstantin Porotchkin <kostap@marvell.com> 7 * 8 * Marvell CP110 UTMI PHY driver 9 */ 10 11 #include <linux/io.h> 12 #include <linux/iopoll.h> 13 #include <linux/mfd/syscon.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/phy/phy.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 #include <linux/usb/of.h> 20 #include <linux/usb/otg.h> 21 22 #define UTMI_PHY_PORTS 2 23 24 /* CP110 UTMI register macro definetions */ 25 #define SYSCON_USB_CFG_REG 0x420 26 #define USB_CFG_DEVICE_EN_MASK BIT(0) 27 #define USB_CFG_DEVICE_MUX_OFFSET 1 28 #define USB_CFG_DEVICE_MUX_MASK BIT(1) 29 #define USB_CFG_PLL_MASK BIT(25) 30 31 #define SYSCON_UTMI_CFG_REG(id) (0x440 + (id) * 4) 32 #define UTMI_PHY_CFG_PU_MASK BIT(5) 33 34 #define UTMI_PLL_CTRL_REG 0x0 35 #define PLL_REFDIV_OFFSET 0 36 #define PLL_REFDIV_MASK GENMASK(6, 0) 37 #define PLL_REFDIV_VAL 0x5 38 #define PLL_FBDIV_OFFSET 16 39 #define PLL_FBDIV_MASK GENMASK(24, 16) 40 #define PLL_FBDIV_VAL 0x60 41 #define PLL_SEL_LPFR_MASK GENMASK(29, 28) 42 #define PLL_RDY BIT(31) 43 #define UTMI_CAL_CTRL_REG 0x8 44 #define IMPCAL_VTH_OFFSET 8 45 #define IMPCAL_VTH_MASK GENMASK(10, 8) 46 #define IMPCAL_VTH_VAL 0x7 47 #define IMPCAL_DONE BIT(23) 48 #define PLLCAL_DONE BIT(31) 49 #define UTMI_TX_CH_CTRL_REG 0xC 50 #define DRV_EN_LS_OFFSET 12 51 #define DRV_EN_LS_MASK GENMASK(15, 12) 52 #define IMP_SEL_LS_OFFSET 16 53 #define IMP_SEL_LS_MASK GENMASK(19, 16) 54 #define TX_AMP_OFFSET 20 55 #define TX_AMP_MASK GENMASK(22, 20) 56 #define TX_AMP_VAL 0x4 57 #define UTMI_RX_CH_CTRL0_REG 0x14 58 #define SQ_DET_EN BIT(15) 59 #define SQ_ANA_DTC_SEL BIT(28) 60 #define UTMI_RX_CH_CTRL1_REG 0x18 61 #define SQ_AMP_CAL_OFFSET 0 62 #define SQ_AMP_CAL_MASK GENMASK(2, 0) 63 #define SQ_AMP_CAL_VAL 1 64 #define SQ_AMP_CAL_EN BIT(3) 65 #define UTMI_CTRL_STATUS0_REG 0x24 66 #define SUSPENDM BIT(22) 67 #define TEST_SEL BIT(25) 68 #define UTMI_CHGDTC_CTRL_REG 0x38 69 #define VDAT_OFFSET 8 70 #define VDAT_MASK GENMASK(9, 8) 71 #define VDAT_VAL 1 72 #define VSRC_OFFSET 10 73 #define VSRC_MASK GENMASK(11, 10) 74 #define VSRC_VAL 1 75 76 #define PLL_LOCK_DELAY_US 10000 77 #define PLL_LOCK_TIMEOUT_US 1000000 78 79 #define PORT_REGS(p) ((p)->priv->regs + (p)->id * 0x1000) 80 81 /** 82 * struct mvebu_cp110_utmi - PHY driver data 83 * 84 * @regs: PHY registers 85 * @syscon: Regmap with system controller registers 86 * @dev: device driver handle 87 * @ops: phy ops 88 */ 89 struct mvebu_cp110_utmi { 90 void __iomem *regs; 91 struct regmap *syscon; 92 struct device *dev; 93 const struct phy_ops *ops; 94 }; 95 96 /** 97 * struct mvebu_cp110_utmi_port - PHY port data 98 * 99 * @priv: PHY driver data 100 * @id: PHY port ID 101 * @dr_mode: PHY connection: USB_DR_MODE_HOST or USB_DR_MODE_PERIPHERAL 102 */ 103 struct mvebu_cp110_utmi_port { 104 struct mvebu_cp110_utmi *priv; 105 u32 id; 106 enum usb_dr_mode dr_mode; 107 }; 108 109 static void mvebu_cp110_utmi_port_setup(struct mvebu_cp110_utmi_port *port) 110 { 111 u32 reg; 112 113 /* 114 * Setup PLL. 115 * The reference clock is the frequency of quartz resonator 116 * connected to pins REFCLK_XIN and REFCLK_XOUT of the SoC. 117 * Register init values are matching the 40MHz default clock. 118 * The crystal used for all platform boards is now 25MHz. 119 * See the functional specification for details. 120 */ 121 reg = readl(PORT_REGS(port) + UTMI_PLL_CTRL_REG); 122 reg &= ~(PLL_REFDIV_MASK | PLL_FBDIV_MASK | PLL_SEL_LPFR_MASK); 123 reg |= (PLL_REFDIV_VAL << PLL_REFDIV_OFFSET) | 124 (PLL_FBDIV_VAL << PLL_FBDIV_OFFSET); 125 writel(reg, PORT_REGS(port) + UTMI_PLL_CTRL_REG); 126 127 /* Impedance Calibration Threshold Setting */ 128 reg = readl(PORT_REGS(port) + UTMI_CAL_CTRL_REG); 129 reg &= ~IMPCAL_VTH_MASK; 130 reg |= IMPCAL_VTH_VAL << IMPCAL_VTH_OFFSET; 131 writel(reg, PORT_REGS(port) + UTMI_CAL_CTRL_REG); 132 133 /* Set LS TX driver strength coarse control */ 134 reg = readl(PORT_REGS(port) + UTMI_TX_CH_CTRL_REG); 135 reg &= ~TX_AMP_MASK; 136 reg |= TX_AMP_VAL << TX_AMP_OFFSET; 137 writel(reg, PORT_REGS(port) + UTMI_TX_CH_CTRL_REG); 138 139 /* Disable SQ and enable analog squelch detect */ 140 reg = readl(PORT_REGS(port) + UTMI_RX_CH_CTRL0_REG); 141 reg &= ~SQ_DET_EN; 142 reg |= SQ_ANA_DTC_SEL; 143 writel(reg, PORT_REGS(port) + UTMI_RX_CH_CTRL0_REG); 144 145 /* 146 * Set External squelch calibration number and 147 * enable the External squelch calibration 148 */ 149 reg = readl(PORT_REGS(port) + UTMI_RX_CH_CTRL1_REG); 150 reg &= ~SQ_AMP_CAL_MASK; 151 reg |= (SQ_AMP_CAL_VAL << SQ_AMP_CAL_OFFSET) | SQ_AMP_CAL_EN; 152 writel(reg, PORT_REGS(port) + UTMI_RX_CH_CTRL1_REG); 153 154 /* 155 * Set Control VDAT Reference Voltage - 0.325V and 156 * Control VSRC Reference Voltage - 0.6V 157 */ 158 reg = readl(PORT_REGS(port) + UTMI_CHGDTC_CTRL_REG); 159 reg &= ~(VDAT_MASK | VSRC_MASK); 160 reg |= (VDAT_VAL << VDAT_OFFSET) | (VSRC_VAL << VSRC_OFFSET); 161 writel(reg, PORT_REGS(port) + UTMI_CHGDTC_CTRL_REG); 162 } 163 164 static int mvebu_cp110_utmi_phy_power_off(struct phy *phy) 165 { 166 struct mvebu_cp110_utmi_port *port = phy_get_drvdata(phy); 167 struct mvebu_cp110_utmi *utmi = port->priv; 168 int i; 169 170 /* Power down UTMI PHY port */ 171 regmap_clear_bits(utmi->syscon, SYSCON_UTMI_CFG_REG(port->id), 172 UTMI_PHY_CFG_PU_MASK); 173 174 for (i = 0; i < UTMI_PHY_PORTS; i++) { 175 int test = regmap_test_bits(utmi->syscon, 176 SYSCON_UTMI_CFG_REG(i), 177 UTMI_PHY_CFG_PU_MASK); 178 /* skip PLL shutdown if there are active UTMI PHY ports */ 179 if (test != 0) 180 return 0; 181 } 182 183 /* PLL Power down if all UTMI PHYs are down */ 184 regmap_clear_bits(utmi->syscon, SYSCON_USB_CFG_REG, USB_CFG_PLL_MASK); 185 186 return 0; 187 } 188 189 static int mvebu_cp110_utmi_phy_power_on(struct phy *phy) 190 { 191 struct mvebu_cp110_utmi_port *port = phy_get_drvdata(phy); 192 struct mvebu_cp110_utmi *utmi = port->priv; 193 struct device *dev = &phy->dev; 194 int ret; 195 u32 reg; 196 197 /* It is necessary to power off UTMI before configuration */ 198 ret = mvebu_cp110_utmi_phy_power_off(phy); 199 if (ret) { 200 dev_err(dev, "UTMI power OFF before power ON failed\n"); 201 return ret; 202 } 203 204 /* 205 * If UTMI port is connected to USB Device controller, 206 * configure the USB MUX prior to UTMI PHY initialization. 207 * The single USB device controller can be connected 208 * to UTMI0 or to UTMI1 PHY port, but not to both. 209 */ 210 if (port->dr_mode == USB_DR_MODE_PERIPHERAL) { 211 regmap_update_bits(utmi->syscon, SYSCON_USB_CFG_REG, 212 USB_CFG_DEVICE_EN_MASK | USB_CFG_DEVICE_MUX_MASK, 213 USB_CFG_DEVICE_EN_MASK | 214 (port->id << USB_CFG_DEVICE_MUX_OFFSET)); 215 } 216 217 /* Set Test suspendm mode and enable Test UTMI select */ 218 reg = readl(PORT_REGS(port) + UTMI_CTRL_STATUS0_REG); 219 reg |= SUSPENDM | TEST_SEL; 220 writel(reg, PORT_REGS(port) + UTMI_CTRL_STATUS0_REG); 221 222 /* Wait for UTMI power down */ 223 mdelay(1); 224 225 /* PHY port setup first */ 226 mvebu_cp110_utmi_port_setup(port); 227 228 /* Power UP UTMI PHY */ 229 regmap_set_bits(utmi->syscon, SYSCON_UTMI_CFG_REG(port->id), 230 UTMI_PHY_CFG_PU_MASK); 231 232 /* Disable Test UTMI select */ 233 reg = readl(PORT_REGS(port) + UTMI_CTRL_STATUS0_REG); 234 reg &= ~TEST_SEL; 235 writel(reg, PORT_REGS(port) + UTMI_CTRL_STATUS0_REG); 236 237 /* Wait for impedance calibration */ 238 ret = readl_poll_timeout(PORT_REGS(port) + UTMI_CAL_CTRL_REG, reg, 239 reg & IMPCAL_DONE, 240 PLL_LOCK_DELAY_US, PLL_LOCK_TIMEOUT_US); 241 if (ret) { 242 dev_err(dev, "Failed to end UTMI impedance calibration\n"); 243 return ret; 244 } 245 246 /* Wait for PLL calibration */ 247 ret = readl_poll_timeout(PORT_REGS(port) + UTMI_CAL_CTRL_REG, reg, 248 reg & PLLCAL_DONE, 249 PLL_LOCK_DELAY_US, PLL_LOCK_TIMEOUT_US); 250 if (ret) { 251 dev_err(dev, "Failed to end UTMI PLL calibration\n"); 252 return ret; 253 } 254 255 /* Wait for PLL ready */ 256 ret = readl_poll_timeout(PORT_REGS(port) + UTMI_PLL_CTRL_REG, reg, 257 reg & PLL_RDY, 258 PLL_LOCK_DELAY_US, PLL_LOCK_TIMEOUT_US); 259 if (ret) { 260 dev_err(dev, "PLL is not ready\n"); 261 return ret; 262 } 263 264 /* PLL Power up */ 265 regmap_set_bits(utmi->syscon, SYSCON_USB_CFG_REG, USB_CFG_PLL_MASK); 266 267 return 0; 268 } 269 270 static const struct phy_ops mvebu_cp110_utmi_phy_ops = { 271 .power_on = mvebu_cp110_utmi_phy_power_on, 272 .power_off = mvebu_cp110_utmi_phy_power_off, 273 .owner = THIS_MODULE, 274 }; 275 276 static const struct of_device_id mvebu_cp110_utmi_of_match[] = { 277 { .compatible = "marvell,cp110-utmi-phy" }, 278 {}, 279 }; 280 MODULE_DEVICE_TABLE(of, mvebu_cp110_utmi_of_match); 281 282 static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev) 283 { 284 struct device *dev = &pdev->dev; 285 struct mvebu_cp110_utmi *utmi; 286 struct phy_provider *provider; 287 struct device_node *child; 288 u32 usb_devices = 0; 289 290 utmi = devm_kzalloc(dev, sizeof(*utmi), GFP_KERNEL); 291 if (!utmi) 292 return -ENOMEM; 293 294 utmi->dev = dev; 295 296 /* Get system controller region */ 297 utmi->syscon = syscon_regmap_lookup_by_phandle(dev->of_node, 298 "marvell,system-controller"); 299 if (IS_ERR(utmi->syscon)) { 300 dev_err(dev, "Missing UTMI system controller\n"); 301 return PTR_ERR(utmi->syscon); 302 } 303 304 /* Get UTMI memory region */ 305 utmi->regs = devm_platform_ioremap_resource(pdev, 0); 306 if (IS_ERR(utmi->regs)) 307 return PTR_ERR(utmi->regs); 308 309 for_each_available_child_of_node(dev->of_node, child) { 310 struct mvebu_cp110_utmi_port *port; 311 struct phy *phy; 312 int ret; 313 u32 port_id; 314 315 ret = of_property_read_u32(child, "reg", &port_id); 316 if ((ret < 0) || (port_id >= UTMI_PHY_PORTS)) { 317 dev_err(dev, 318 "invalid 'reg' property on child %pOF\n", 319 child); 320 continue; 321 } 322 323 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); 324 if (!port) { 325 of_node_put(child); 326 return -ENOMEM; 327 } 328 329 port->dr_mode = of_usb_get_dr_mode_by_phy(child, -1); 330 if ((port->dr_mode != USB_DR_MODE_HOST) && 331 (port->dr_mode != USB_DR_MODE_PERIPHERAL)) { 332 dev_err(&pdev->dev, 333 "Missing dual role setting of the port%d, will use HOST mode\n", 334 port_id); 335 port->dr_mode = USB_DR_MODE_HOST; 336 } 337 338 if (port->dr_mode == USB_DR_MODE_PERIPHERAL) { 339 usb_devices++; 340 if (usb_devices > 1) { 341 dev_err(dev, 342 "Single USB device allowed! Port%d will use HOST mode\n", 343 port_id); 344 port->dr_mode = USB_DR_MODE_HOST; 345 } 346 } 347 348 /* Retrieve PHY capabilities */ 349 utmi->ops = &mvebu_cp110_utmi_phy_ops; 350 351 /* Instantiate the PHY */ 352 phy = devm_phy_create(dev, child, utmi->ops); 353 if (IS_ERR(phy)) { 354 dev_err(dev, "Failed to create the UTMI PHY\n"); 355 of_node_put(child); 356 return PTR_ERR(phy); 357 } 358 359 port->priv = utmi; 360 port->id = port_id; 361 phy_set_drvdata(phy, port); 362 363 /* Ensure the PHY is powered off */ 364 mvebu_cp110_utmi_phy_power_off(phy); 365 } 366 367 dev_set_drvdata(dev, utmi); 368 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 369 370 return PTR_ERR_OR_ZERO(provider); 371 } 372 373 static struct platform_driver mvebu_cp110_utmi_driver = { 374 .probe = mvebu_cp110_utmi_phy_probe, 375 .driver = { 376 .name = "mvebu-cp110-utmi-phy", 377 .of_match_table = mvebu_cp110_utmi_of_match, 378 }, 379 }; 380 module_platform_driver(mvebu_cp110_utmi_driver); 381 382 MODULE_AUTHOR("Konstatin Porotchkin <kostap@marvell.com>"); 383 MODULE_DESCRIPTION("Marvell Armada CP110 UTMI PHY driver"); 384 MODULE_LICENSE("GPL v2"); 385