Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 STMicroelectronics |
| 3 | * |
| 4 | * STMicroelectronics Generic PHY driver for STiH407 USB2. |
| 5 | * |
| 6 | * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2, as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | */ |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/io.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/of.h> |
| 18 | #include <linux/of_platform.h> |
| 19 | #include <linux/clk.h> |
| 20 | #include <linux/regmap.h> |
| 21 | #include <linux/reset.h> |
| 22 | #include <linux/mfd/syscon.h> |
| 23 | #include <linux/phy/phy.h> |
| 24 | |
Peter Griffin | 937127f | 2015-01-07 15:04:06 +0000 | [diff] [blame] | 25 | #define PHYPARAM_REG 1 |
| 26 | #define PHYCTRL_REG 2 |
| 27 | |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 28 | /* Default PHY_SEL and REFCLKSEL configuration */ |
| 29 | #define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6 |
| 30 | #define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f |
| 31 | |
| 32 | /* ports parameters overriding */ |
| 33 | #define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc |
| 34 | #define STIH407_USB_PICOPHY_PARAM_MASK 0xffffffff |
| 35 | |
| 36 | struct stih407_usb2_picophy { |
| 37 | struct phy *phy; |
| 38 | struct regmap *regmap; |
| 39 | struct device *dev; |
| 40 | struct reset_control *rstc; |
| 41 | struct reset_control *rstport; |
| 42 | int ctrl; |
| 43 | int param; |
| 44 | }; |
| 45 | |
| 46 | static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev) |
| 47 | { |
| 48 | reset_control_deassert(phy_dev->rstc); |
| 49 | |
| 50 | return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl, |
| 51 | STIH407_USB_PICOPHY_CTRL_PORT_MASK, |
| 52 | STIH407_USB_PICOPHY_CTRL_PORT_CONF); |
| 53 | } |
| 54 | |
| 55 | static int stih407_usb2_init_port(struct phy *phy) |
| 56 | { |
| 57 | int ret; |
| 58 | struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy); |
| 59 | |
| 60 | stih407_usb2_pico_ctrl(phy_dev); |
| 61 | |
| 62 | ret = regmap_update_bits(phy_dev->regmap, |
| 63 | phy_dev->param, |
| 64 | STIH407_USB_PICOPHY_PARAM_MASK, |
| 65 | STIH407_USB_PICOPHY_PARAM_DEF); |
| 66 | if (ret) |
| 67 | return ret; |
| 68 | |
| 69 | return reset_control_deassert(phy_dev->rstport); |
| 70 | } |
| 71 | |
| 72 | static int stih407_usb2_exit_port(struct phy *phy) |
| 73 | { |
| 74 | struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy); |
| 75 | |
| 76 | /* |
| 77 | * Only port reset is asserted, phy global reset is kept untouched |
| 78 | * as other ports may still be active. When all ports are in reset |
| 79 | * state, assumption is made that power will be cut off on the phy, in |
| 80 | * case of suspend for instance. Theoretically, asserting individual |
| 81 | * reset (like here) or global reset should be equivalent. |
| 82 | */ |
| 83 | return reset_control_assert(phy_dev->rstport); |
| 84 | } |
| 85 | |
| 86 | static const struct phy_ops stih407_usb2_picophy_data = { |
| 87 | .init = stih407_usb2_init_port, |
| 88 | .exit = stih407_usb2_exit_port, |
| 89 | .owner = THIS_MODULE, |
| 90 | }; |
| 91 | |
| 92 | static int stih407_usb2_picophy_probe(struct platform_device *pdev) |
| 93 | { |
| 94 | struct stih407_usb2_picophy *phy_dev; |
| 95 | struct device *dev = &pdev->dev; |
| 96 | struct device_node *np = dev->of_node; |
| 97 | struct phy_provider *phy_provider; |
| 98 | struct phy *phy; |
Peter Griffin | 937127f | 2015-01-07 15:04:06 +0000 | [diff] [blame] | 99 | int ret; |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 100 | |
| 101 | phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL); |
| 102 | if (!phy_dev) |
| 103 | return -ENOMEM; |
| 104 | |
| 105 | phy_dev->dev = dev; |
| 106 | dev_set_drvdata(dev, phy_dev); |
| 107 | |
Lee Jones | 9278e70 | 2016-06-28 09:32:12 +0100 | [diff] [blame^] | 108 | phy_dev->rstc = devm_reset_control_get_shared(dev, "global"); |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 109 | if (IS_ERR(phy_dev->rstc)) { |
| 110 | dev_err(dev, "failed to ctrl picoPHY reset\n"); |
| 111 | return PTR_ERR(phy_dev->rstc); |
| 112 | } |
| 113 | |
| 114 | phy_dev->rstport = devm_reset_control_get(dev, "port"); |
| 115 | if (IS_ERR(phy_dev->rstport)) { |
| 116 | dev_err(dev, "failed to ctrl picoPHY reset\n"); |
| 117 | return PTR_ERR(phy_dev->rstport); |
| 118 | } |
| 119 | |
| 120 | /* Reset port by default: only deassert it in phy init */ |
| 121 | reset_control_assert(phy_dev->rstport); |
| 122 | |
| 123 | phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); |
| 124 | if (IS_ERR(phy_dev->regmap)) { |
| 125 | dev_err(dev, "No syscfg phandle specified\n"); |
| 126 | return PTR_ERR(phy_dev->regmap); |
| 127 | } |
| 128 | |
Peter Griffin | 937127f | 2015-01-07 15:04:06 +0000 | [diff] [blame] | 129 | ret = of_property_read_u32_index(np, "st,syscfg", PHYPARAM_REG, |
| 130 | &phy_dev->param); |
| 131 | if (ret) { |
| 132 | dev_err(dev, "can't get phyparam offset (%d)\n", ret); |
| 133 | return ret; |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 134 | } |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 135 | |
Peter Griffin | 937127f | 2015-01-07 15:04:06 +0000 | [diff] [blame] | 136 | ret = of_property_read_u32_index(np, "st,syscfg", PHYCTRL_REG, |
| 137 | &phy_dev->ctrl); |
| 138 | if (ret) { |
| 139 | dev_err(dev, "can't get phyctrl offset (%d)\n", ret); |
| 140 | return ret; |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 141 | } |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 142 | |
Heikki Krogerus | dbc9863 | 2014-11-19 17:28:21 +0200 | [diff] [blame] | 143 | phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data); |
Peter Griffin | 89ae1f5 | 2014-09-11 18:02:44 +0100 | [diff] [blame] | 144 | if (IS_ERR(phy)) { |
| 145 | dev_err(dev, "failed to create Display Port PHY\n"); |
| 146 | return PTR_ERR(phy); |
| 147 | } |
| 148 | |
| 149 | phy_dev->phy = phy; |
| 150 | phy_set_drvdata(phy, phy_dev); |
| 151 | |
| 152 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
| 153 | if (IS_ERR(phy_provider)) |
| 154 | return PTR_ERR(phy_provider); |
| 155 | |
| 156 | dev_info(dev, "STiH407 USB Generic picoPHY driver probed!"); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static const struct of_device_id stih407_usb2_picophy_of_match[] = { |
| 162 | { .compatible = "st,stih407-usb2-phy" }, |
| 163 | { /*sentinel */ }, |
| 164 | }; |
| 165 | |
| 166 | MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match); |
| 167 | |
| 168 | static struct platform_driver stih407_usb2_picophy_driver = { |
| 169 | .probe = stih407_usb2_picophy_probe, |
| 170 | .driver = { |
| 171 | .name = "stih407-usb-genphy", |
| 172 | .of_match_table = stih407_usb2_picophy_of_match, |
| 173 | } |
| 174 | }; |
| 175 | |
| 176 | module_platform_driver(stih407_usb2_picophy_driver); |
| 177 | |
| 178 | MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>"); |
| 179 | MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407"); |
| 180 | MODULE_LICENSE("GPL v2"); |