Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Allwinner sun4i USB phy driver |
| 3 | * |
| 4 | * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com> |
| 5 | * |
| 6 | * Based on code from |
| 7 | * Allwinner Technology Co., Ltd. <www.allwinnertech.com> |
| 8 | * |
| 9 | * Modelled after: Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver |
| 10 | * Copyright (C) 2013 Samsung Electronics Co., Ltd. |
| 11 | * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/clk.h> |
Sachin Kamat | 2d84aff | 2014-05-29 12:00:49 +0530 | [diff] [blame] | 25 | #include <linux/err.h> |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 26 | #include <linux/io.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/mutex.h> |
| 30 | #include <linux/of.h> |
| 31 | #include <linux/of_address.h> |
| 32 | #include <linux/phy/phy.h> |
| 33 | #include <linux/platform_device.h> |
| 34 | #include <linux/regulator/consumer.h> |
| 35 | #include <linux/reset.h> |
| 36 | |
| 37 | #define REG_ISCR 0x00 |
| 38 | #define REG_PHYCTL 0x04 |
| 39 | #define REG_PHYBIST 0x08 |
| 40 | #define REG_PHYTUNE 0x0c |
| 41 | |
| 42 | #define PHYCTL_DATA BIT(7) |
| 43 | |
| 44 | #define SUNXI_AHB_ICHR8_EN BIT(10) |
| 45 | #define SUNXI_AHB_INCR4_BURST_EN BIT(9) |
| 46 | #define SUNXI_AHB_INCRX_ALIGN_EN BIT(8) |
| 47 | #define SUNXI_ULPI_BYPASS_EN BIT(0) |
| 48 | |
| 49 | /* Common Control Bits for Both PHYs */ |
| 50 | #define PHY_PLL_BW 0x03 |
| 51 | #define PHY_RES45_CAL_EN 0x0c |
| 52 | |
| 53 | /* Private Control Bits for Each PHY */ |
| 54 | #define PHY_TX_AMPLITUDE_TUNE 0x20 |
| 55 | #define PHY_TX_SLEWRATE_TUNE 0x22 |
| 56 | #define PHY_VBUSVALID_TH_SEL 0x25 |
| 57 | #define PHY_PULLUP_RES_SEL 0x27 |
| 58 | #define PHY_OTG_FUNC_EN 0x28 |
| 59 | #define PHY_VBUS_DET_EN 0x29 |
| 60 | #define PHY_DISCON_TH_SEL 0x2a |
| 61 | |
| 62 | #define MAX_PHYS 3 |
| 63 | |
| 64 | struct sun4i_usb_phy_data { |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 65 | void __iomem *base; |
| 66 | struct mutex mutex; |
| 67 | int num_phys; |
| 68 | u32 disc_thresh; |
| 69 | struct sun4i_usb_phy { |
| 70 | struct phy *phy; |
| 71 | void __iomem *pmu; |
| 72 | struct regulator *vbus; |
| 73 | struct reset_control *reset; |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 74 | struct clk *clk; |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 75 | int index; |
| 76 | } phys[MAX_PHYS]; |
| 77 | }; |
| 78 | |
| 79 | #define to_sun4i_usb_phy_data(phy) \ |
| 80 | container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index]) |
| 81 | |
| 82 | static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data, |
| 83 | int len) |
| 84 | { |
| 85 | struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy); |
| 86 | u32 temp, usbc_bit = BIT(phy->index * 2); |
| 87 | int i; |
| 88 | |
| 89 | mutex_lock(&phy_data->mutex); |
| 90 | |
| 91 | for (i = 0; i < len; i++) { |
| 92 | temp = readl(phy_data->base + REG_PHYCTL); |
| 93 | |
| 94 | /* clear the address portion */ |
| 95 | temp &= ~(0xff << 8); |
| 96 | |
| 97 | /* set the address */ |
| 98 | temp |= ((addr + i) << 8); |
| 99 | writel(temp, phy_data->base + REG_PHYCTL); |
| 100 | |
| 101 | /* set the data bit and clear usbc bit*/ |
| 102 | temp = readb(phy_data->base + REG_PHYCTL); |
| 103 | if (data & 0x1) |
| 104 | temp |= PHYCTL_DATA; |
| 105 | else |
| 106 | temp &= ~PHYCTL_DATA; |
| 107 | temp &= ~usbc_bit; |
| 108 | writeb(temp, phy_data->base + REG_PHYCTL); |
| 109 | |
| 110 | /* pulse usbc_bit */ |
| 111 | temp = readb(phy_data->base + REG_PHYCTL); |
| 112 | temp |= usbc_bit; |
| 113 | writeb(temp, phy_data->base + REG_PHYCTL); |
| 114 | |
| 115 | temp = readb(phy_data->base + REG_PHYCTL); |
| 116 | temp &= ~usbc_bit; |
| 117 | writeb(temp, phy_data->base + REG_PHYCTL); |
| 118 | |
| 119 | data >>= 1; |
| 120 | } |
| 121 | mutex_unlock(&phy_data->mutex); |
| 122 | } |
| 123 | |
| 124 | static void sun4i_usb_phy_passby(struct sun4i_usb_phy *phy, int enable) |
| 125 | { |
| 126 | u32 bits, reg_value; |
| 127 | |
| 128 | if (!phy->pmu) |
| 129 | return; |
| 130 | |
| 131 | bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN | |
| 132 | SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN; |
| 133 | |
| 134 | reg_value = readl(phy->pmu); |
| 135 | |
| 136 | if (enable) |
| 137 | reg_value |= bits; |
| 138 | else |
| 139 | reg_value &= ~bits; |
| 140 | |
| 141 | writel(reg_value, phy->pmu); |
| 142 | } |
| 143 | |
| 144 | static int sun4i_usb_phy_init(struct phy *_phy) |
| 145 | { |
| 146 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); |
| 147 | struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy); |
| 148 | int ret; |
| 149 | |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 150 | ret = clk_prepare_enable(phy->clk); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 151 | if (ret) |
| 152 | return ret; |
| 153 | |
| 154 | ret = reset_control_deassert(phy->reset); |
| 155 | if (ret) { |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 156 | clk_disable_unprepare(phy->clk); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | /* Adjust PHY's magnitude and rate */ |
| 161 | sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5); |
| 162 | |
| 163 | /* Disconnect threshold adjustment */ |
| 164 | sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL, data->disc_thresh, 2); |
| 165 | |
| 166 | sun4i_usb_phy_passby(phy, 1); |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int sun4i_usb_phy_exit(struct phy *_phy) |
| 172 | { |
| 173 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 174 | |
| 175 | sun4i_usb_phy_passby(phy, 0); |
| 176 | reset_control_assert(phy->reset); |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 177 | clk_disable_unprepare(phy->clk); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static int sun4i_usb_phy_power_on(struct phy *_phy) |
| 183 | { |
| 184 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); |
| 185 | int ret = 0; |
| 186 | |
| 187 | if (phy->vbus) |
| 188 | ret = regulator_enable(phy->vbus); |
| 189 | |
| 190 | return ret; |
| 191 | } |
| 192 | |
| 193 | static int sun4i_usb_phy_power_off(struct phy *_phy) |
| 194 | { |
| 195 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); |
| 196 | |
| 197 | if (phy->vbus) |
| 198 | regulator_disable(phy->vbus); |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | static struct phy_ops sun4i_usb_phy_ops = { |
| 204 | .init = sun4i_usb_phy_init, |
| 205 | .exit = sun4i_usb_phy_exit, |
| 206 | .power_on = sun4i_usb_phy_power_on, |
| 207 | .power_off = sun4i_usb_phy_power_off, |
| 208 | .owner = THIS_MODULE, |
| 209 | }; |
| 210 | |
| 211 | static struct phy *sun4i_usb_phy_xlate(struct device *dev, |
| 212 | struct of_phandle_args *args) |
| 213 | { |
| 214 | struct sun4i_usb_phy_data *data = dev_get_drvdata(dev); |
| 215 | |
| 216 | if (WARN_ON(args->args[0] == 0 || args->args[0] >= data->num_phys)) |
| 217 | return ERR_PTR(-ENODEV); |
| 218 | |
| 219 | return data->phys[args->args[0]].phy; |
| 220 | } |
| 221 | |
| 222 | static int sun4i_usb_phy_probe(struct platform_device *pdev) |
| 223 | { |
| 224 | struct sun4i_usb_phy_data *data; |
| 225 | struct device *dev = &pdev->dev; |
| 226 | struct device_node *np = dev->of_node; |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 227 | struct phy_provider *phy_provider; |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 228 | bool dedicated_clocks; |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 229 | struct resource *res; |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 230 | int i; |
| 231 | |
| 232 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
| 233 | if (!data) |
| 234 | return -ENOMEM; |
| 235 | |
| 236 | mutex_init(&data->mutex); |
| 237 | |
| 238 | if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy")) |
| 239 | data->num_phys = 2; |
| 240 | else |
| 241 | data->num_phys = 3; |
| 242 | |
| 243 | if (of_device_is_compatible(np, "allwinner,sun4i-a10-usb-phy")) |
| 244 | data->disc_thresh = 3; |
| 245 | else |
| 246 | data->disc_thresh = 2; |
| 247 | |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 248 | if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy")) |
| 249 | dedicated_clocks = true; |
| 250 | else |
| 251 | dedicated_clocks = false; |
| 252 | |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 253 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl"); |
| 254 | data->base = devm_ioremap_resource(dev, res); |
| 255 | if (IS_ERR(data->base)) |
| 256 | return PTR_ERR(data->base); |
| 257 | |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 258 | /* Skip 0, 0 is the phy for otg which is not yet supported. */ |
| 259 | for (i = 1; i < data->num_phys; i++) { |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 260 | struct sun4i_usb_phy *phy = data->phys + i; |
| 261 | char name[16]; |
| 262 | |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 263 | snprintf(name, sizeof(name), "usb%d_vbus", i); |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 264 | phy->vbus = devm_regulator_get_optional(dev, name); |
| 265 | if (IS_ERR(phy->vbus)) { |
| 266 | if (PTR_ERR(phy->vbus) == -EPROBE_DEFER) |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 267 | return -EPROBE_DEFER; |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 268 | phy->vbus = NULL; |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 269 | } |
| 270 | |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 271 | if (dedicated_clocks) |
| 272 | snprintf(name, sizeof(name), "usb%d_phy", i); |
| 273 | else |
| 274 | strlcpy(name, "usb_phy", sizeof(name)); |
| 275 | |
| 276 | phy->clk = devm_clk_get(dev, name); |
| 277 | if (IS_ERR(phy->clk)) { |
| 278 | dev_err(dev, "failed to get clock %s\n", name); |
| 279 | return PTR_ERR(phy->clk); |
| 280 | } |
| 281 | |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 282 | snprintf(name, sizeof(name), "usb%d_reset", i); |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 283 | phy->reset = devm_reset_control_get(dev, name); |
| 284 | if (IS_ERR(phy->reset)) { |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 285 | dev_err(dev, "failed to get reset %s\n", name); |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 286 | return PTR_ERR(phy->reset); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | if (i) { /* No pmu for usbc0 */ |
| 290 | snprintf(name, sizeof(name), "pmu%d", i); |
| 291 | res = platform_get_resource_byname(pdev, |
| 292 | IORESOURCE_MEM, name); |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 293 | phy->pmu = devm_ioremap_resource(dev, res); |
| 294 | if (IS_ERR(phy->pmu)) |
| 295 | return PTR_ERR(phy->pmu); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 296 | } |
| 297 | |
Kishon Vijay Abraham I | f0ed817 | 2014-07-14 15:55:02 +0530 | [diff] [blame] | 298 | phy->phy = devm_phy_create(dev, NULL, &sun4i_usb_phy_ops, NULL); |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 299 | if (IS_ERR(phy->phy)) { |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 300 | dev_err(dev, "failed to create PHY %d\n", i); |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 301 | return PTR_ERR(phy->phy); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 302 | } |
| 303 | |
Maxime Ripard | 2a7f998 | 2014-05-13 17:44:17 +0200 | [diff] [blame] | 304 | phy->index = i; |
| 305 | phy_set_drvdata(phy->phy, &data->phys[i]); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | dev_set_drvdata(dev, data); |
| 309 | phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 310 | |
Sachin Kamat | 2d84aff | 2014-05-29 12:00:49 +0530 | [diff] [blame] | 311 | return PTR_ERR_OR_ZERO(phy_provider); |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | static const struct of_device_id sun4i_usb_phy_of_match[] = { |
| 315 | { .compatible = "allwinner,sun4i-a10-usb-phy" }, |
| 316 | { .compatible = "allwinner,sun5i-a13-usb-phy" }, |
Maxime Ripard | eadd431 | 2014-05-13 17:44:18 +0200 | [diff] [blame] | 317 | { .compatible = "allwinner,sun6i-a31-usb-phy" }, |
Hans de Goede | ba4bdc9 | 2014-03-01 18:09:26 +0100 | [diff] [blame] | 318 | { .compatible = "allwinner,sun7i-a20-usb-phy" }, |
| 319 | { }, |
| 320 | }; |
| 321 | MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match); |
| 322 | |
| 323 | static struct platform_driver sun4i_usb_phy_driver = { |
| 324 | .probe = sun4i_usb_phy_probe, |
| 325 | .driver = { |
| 326 | .of_match_table = sun4i_usb_phy_of_match, |
| 327 | .name = "sun4i-usb-phy", |
| 328 | .owner = THIS_MODULE, |
| 329 | } |
| 330 | }; |
| 331 | module_platform_driver(sun4i_usb_phy_driver); |
| 332 | |
| 333 | MODULE_DESCRIPTION("Allwinner sun4i USB phy driver"); |
| 334 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); |
| 335 | MODULE_LICENSE("GPL v2"); |