Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Renesas R-Car Gen2 USB phy driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Renesas Solutions Corp. |
| 5 | * Copyright (C) 2013 Cogent Embedded, Inc. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/clk.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/io.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/platform_data/usb-rcar-gen2-phy.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/usb/otg.h> |
| 20 | |
| 21 | struct rcar_gen2_usb_phy_priv { |
| 22 | struct usb_phy phy; |
| 23 | void __iomem *base; |
| 24 | struct clk *clk; |
| 25 | spinlock_t lock; |
| 26 | int usecount; |
| 27 | u32 ugctrl2; |
| 28 | }; |
| 29 | |
| 30 | #define usb_phy_to_priv(p) container_of(p, struct rcar_gen2_usb_phy_priv, phy) |
| 31 | |
| 32 | /* Low Power Status register */ |
| 33 | #define USBHS_LPSTS_REG 0x02 |
| 34 | #define USBHS_LPSTS_SUSPM (1 << 14) |
| 35 | |
| 36 | /* USB General control register */ |
| 37 | #define USBHS_UGCTRL_REG 0x80 |
| 38 | #define USBHS_UGCTRL_CONNECT (1 << 2) |
| 39 | #define USBHS_UGCTRL_PLLRESET (1 << 0) |
| 40 | |
| 41 | /* USB General control register 2 */ |
| 42 | #define USBHS_UGCTRL2_REG 0x84 |
| 43 | #define USBHS_UGCTRL2_USB0_PCI (1 << 4) |
| 44 | #define USBHS_UGCTRL2_USB0_HS (3 << 4) |
| 45 | #define USBHS_UGCTRL2_USB2_PCI (0 << 31) |
| 46 | #define USBHS_UGCTRL2_USB2_SS (1 << 31) |
| 47 | |
| 48 | /* USB General status register */ |
| 49 | #define USBHS_UGSTS_REG 0x88 |
| 50 | #define USBHS_UGSTS_LOCK (3 << 8) |
| 51 | |
| 52 | /* Enable USBHS internal phy */ |
| 53 | static int __rcar_gen2_usbhs_phy_enable(void __iomem *base) |
| 54 | { |
| 55 | u32 val; |
| 56 | int i; |
| 57 | |
| 58 | /* USBHS PHY power on */ |
| 59 | val = ioread32(base + USBHS_UGCTRL_REG); |
| 60 | val &= ~USBHS_UGCTRL_PLLRESET; |
| 61 | iowrite32(val, base + USBHS_UGCTRL_REG); |
| 62 | |
| 63 | val = ioread16(base + USBHS_LPSTS_REG); |
| 64 | val |= USBHS_LPSTS_SUSPM; |
| 65 | iowrite16(val, base + USBHS_LPSTS_REG); |
| 66 | |
| 67 | for (i = 0; i < 20; i++) { |
| 68 | val = ioread32(base + USBHS_UGSTS_REG); |
| 69 | if ((val & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) { |
| 70 | val = ioread32(base + USBHS_UGCTRL_REG); |
| 71 | val |= USBHS_UGCTRL_CONNECT; |
| 72 | iowrite32(val, base + USBHS_UGCTRL_REG); |
| 73 | return 0; |
| 74 | } |
| 75 | udelay(1); |
| 76 | } |
| 77 | |
| 78 | /* Timed out waiting for the PLL lock */ |
| 79 | return -ETIMEDOUT; |
| 80 | } |
| 81 | |
| 82 | /* Disable USBHS internal phy */ |
| 83 | static int __rcar_gen2_usbhs_phy_disable(void __iomem *base) |
| 84 | { |
| 85 | u32 val; |
| 86 | |
| 87 | /* USBHS PHY power off */ |
| 88 | val = ioread32(base + USBHS_UGCTRL_REG); |
| 89 | val &= ~USBHS_UGCTRL_CONNECT; |
| 90 | iowrite32(val, base + USBHS_UGCTRL_REG); |
| 91 | |
| 92 | val = ioread16(base + USBHS_LPSTS_REG); |
| 93 | val &= ~USBHS_LPSTS_SUSPM; |
| 94 | iowrite16(val, base + USBHS_LPSTS_REG); |
| 95 | |
| 96 | val = ioread32(base + USBHS_UGCTRL_REG); |
| 97 | val |= USBHS_UGCTRL_PLLRESET; |
| 98 | iowrite32(val, base + USBHS_UGCTRL_REG); |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* Setup USB channels */ |
| 103 | static void __rcar_gen2_usb_phy_init(struct rcar_gen2_usb_phy_priv *priv) |
| 104 | { |
| 105 | u32 val; |
| 106 | |
| 107 | clk_prepare_enable(priv->clk); |
| 108 | |
| 109 | /* Set USB channels in the USBHS UGCTRL2 register */ |
Valentine Barshak | c8ba811 | 2013-10-25 21:07:12 +0400 | [diff] [blame] | 110 | val = ioread32(priv->base + USBHS_UGCTRL2_REG); |
Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 111 | val &= ~(USBHS_UGCTRL2_USB0_HS | USBHS_UGCTRL2_USB2_SS); |
| 112 | val |= priv->ugctrl2; |
Valentine Barshak | c8ba811 | 2013-10-25 21:07:12 +0400 | [diff] [blame] | 113 | iowrite32(val, priv->base + USBHS_UGCTRL2_REG); |
Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /* Shutdown USB channels */ |
| 117 | static void __rcar_gen2_usb_phy_shutdown(struct rcar_gen2_usb_phy_priv *priv) |
| 118 | { |
| 119 | __rcar_gen2_usbhs_phy_disable(priv->base); |
| 120 | clk_disable_unprepare(priv->clk); |
| 121 | } |
| 122 | |
| 123 | static int rcar_gen2_usb_phy_set_suspend(struct usb_phy *phy, int suspend) |
| 124 | { |
| 125 | struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy); |
| 126 | unsigned long flags; |
| 127 | int retval; |
| 128 | |
| 129 | spin_lock_irqsave(&priv->lock, flags); |
| 130 | retval = suspend ? __rcar_gen2_usbhs_phy_disable(priv->base) : |
| 131 | __rcar_gen2_usbhs_phy_enable(priv->base); |
| 132 | spin_unlock_irqrestore(&priv->lock, flags); |
| 133 | return retval; |
| 134 | } |
| 135 | |
| 136 | static int rcar_gen2_usb_phy_init(struct usb_phy *phy) |
| 137 | { |
| 138 | struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy); |
| 139 | unsigned long flags; |
| 140 | |
| 141 | spin_lock_irqsave(&priv->lock, flags); |
| 142 | /* |
| 143 | * Enable the clock and setup USB channels |
| 144 | * if it's the first user |
| 145 | */ |
| 146 | if (!priv->usecount++) |
| 147 | __rcar_gen2_usb_phy_init(priv); |
| 148 | spin_unlock_irqrestore(&priv->lock, flags); |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static void rcar_gen2_usb_phy_shutdown(struct usb_phy *phy) |
| 153 | { |
| 154 | struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy); |
| 155 | unsigned long flags; |
| 156 | |
| 157 | spin_lock_irqsave(&priv->lock, flags); |
| 158 | if (!priv->usecount) { |
| 159 | dev_warn(phy->dev, "Trying to disable phy with 0 usecount\n"); |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | /* Disable everything if it's the last user */ |
| 164 | if (!--priv->usecount) |
| 165 | __rcar_gen2_usb_phy_shutdown(priv); |
| 166 | out: |
| 167 | spin_unlock_irqrestore(&priv->lock, flags); |
| 168 | } |
| 169 | |
| 170 | static int rcar_gen2_usb_phy_probe(struct platform_device *pdev) |
| 171 | { |
| 172 | struct device *dev = &pdev->dev; |
| 173 | struct rcar_gen2_phy_platform_data *pdata; |
| 174 | struct rcar_gen2_usb_phy_priv *priv; |
| 175 | struct resource *res; |
| 176 | void __iomem *base; |
| 177 | struct clk *clk; |
| 178 | int retval; |
| 179 | |
Sergei Shtylyov | 7241a21 | 2014-02-22 04:29:15 +0300 | [diff] [blame] | 180 | pdata = dev_get_platdata(dev); |
Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 181 | if (!pdata) { |
| 182 | dev_err(dev, "No platform data\n"); |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | |
Sergei Shtylyov | 7241a21 | 2014-02-22 04:29:15 +0300 | [diff] [blame] | 186 | clk = devm_clk_get(dev, "usbhs"); |
Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 187 | if (IS_ERR(clk)) { |
Sergei Shtylyov | 7241a21 | 2014-02-22 04:29:15 +0300 | [diff] [blame] | 188 | dev_err(dev, "Can't get the clock\n"); |
Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 189 | return PTR_ERR(clk); |
| 190 | } |
| 191 | |
| 192 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 193 | base = devm_ioremap_resource(dev, res); |
| 194 | if (IS_ERR(base)) |
| 195 | return PTR_ERR(base); |
| 196 | |
| 197 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
| 198 | if (!priv) { |
| 199 | dev_err(dev, "Memory allocation failed\n"); |
| 200 | return -ENOMEM; |
| 201 | } |
| 202 | |
| 203 | spin_lock_init(&priv->lock); |
| 204 | priv->clk = clk; |
| 205 | priv->base = base; |
| 206 | priv->ugctrl2 = pdata->chan0_pci ? |
| 207 | USBHS_UGCTRL2_USB0_PCI : USBHS_UGCTRL2_USB0_HS; |
| 208 | priv->ugctrl2 |= pdata->chan2_pci ? |
| 209 | USBHS_UGCTRL2_USB2_PCI : USBHS_UGCTRL2_USB2_SS; |
| 210 | priv->phy.dev = dev; |
| 211 | priv->phy.label = dev_name(dev); |
| 212 | priv->phy.init = rcar_gen2_usb_phy_init; |
| 213 | priv->phy.shutdown = rcar_gen2_usb_phy_shutdown; |
| 214 | priv->phy.set_suspend = rcar_gen2_usb_phy_set_suspend; |
| 215 | |
Valentine Barshak | c3e5d29 | 2013-12-09 23:40:33 +0400 | [diff] [blame] | 216 | retval = usb_add_phy_dev(&priv->phy); |
Valentine Barshak | 5578b26 | 2013-10-10 20:35:17 +0400 | [diff] [blame] | 217 | if (retval < 0) { |
| 218 | dev_err(dev, "Failed to add USB phy\n"); |
| 219 | return retval; |
| 220 | } |
| 221 | |
| 222 | platform_set_drvdata(pdev, priv); |
| 223 | |
| 224 | return retval; |
| 225 | } |
| 226 | |
| 227 | static int rcar_gen2_usb_phy_remove(struct platform_device *pdev) |
| 228 | { |
| 229 | struct rcar_gen2_usb_phy_priv *priv = platform_get_drvdata(pdev); |
| 230 | |
| 231 | usb_remove_phy(&priv->phy); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static struct platform_driver rcar_gen2_usb_phy_driver = { |
| 237 | .driver = { |
| 238 | .name = "usb_phy_rcar_gen2", |
| 239 | }, |
| 240 | .probe = rcar_gen2_usb_phy_probe, |
| 241 | .remove = rcar_gen2_usb_phy_remove, |
| 242 | }; |
| 243 | |
| 244 | module_platform_driver(rcar_gen2_usb_phy_driver); |
| 245 | |
| 246 | MODULE_LICENSE("GPL v2"); |
| 247 | MODULE_DESCRIPTION("Renesas R-Car Gen2 USB phy"); |
| 248 | MODULE_AUTHOR("Valentine Barshak <valentine.barshak@cogentembedded.com>"); |