1 /* 2 * Copyright 2012 Freescale Semiconductor, Inc. 3 * Copyright (C) 2012 Marek Vasut <marex@denx.de> 4 * on behalf of DENX Software Engineering GmbH 5 * 6 * The code contained herein is licensed under the GNU General Public 7 * License. You may obtain a copy of the GNU General Public License 8 * Version 2 or later at the following locations: 9 * 10 * http://www.opensource.org/licenses/gpl-license.html 11 * http://www.gnu.org/copyleft/gpl.html 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/platform_device.h> 17 #include <linux/clk.h> 18 #include <linux/usb/otg.h> 19 #include <linux/stmp_device.h> 20 #include <linux/delay.h> 21 #include <linux/err.h> 22 #include <linux/io.h> 23 24 #define DRIVER_NAME "mxs_phy" 25 26 #define HW_USBPHY_PWD 0x00 27 #define HW_USBPHY_CTRL 0x30 28 #define HW_USBPHY_CTRL_SET 0x34 29 #define HW_USBPHY_CTRL_CLR 0x38 30 31 #define BM_USBPHY_CTRL_SFTRST BIT(31) 32 #define BM_USBPHY_CTRL_CLKGATE BIT(30) 33 #define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15) 34 #define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14) 35 #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1) 36 37 struct mxs_phy { 38 struct usb_phy phy; 39 struct clk *clk; 40 }; 41 42 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy) 43 44 static void mxs_phy_hw_init(struct mxs_phy *mxs_phy) 45 { 46 void __iomem *base = mxs_phy->phy.io_priv; 47 48 stmp_reset_block(base + HW_USBPHY_CTRL); 49 50 /* Power up the PHY */ 51 writel(0, base + HW_USBPHY_PWD); 52 53 /* enable FS/LS device */ 54 writel(BM_USBPHY_CTRL_ENUTMILEVEL2 | 55 BM_USBPHY_CTRL_ENUTMILEVEL3, 56 base + HW_USBPHY_CTRL_SET); 57 } 58 59 static int mxs_phy_init(struct usb_phy *phy) 60 { 61 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 62 63 clk_prepare_enable(mxs_phy->clk); 64 mxs_phy_hw_init(mxs_phy); 65 66 return 0; 67 } 68 69 static void mxs_phy_shutdown(struct usb_phy *phy) 70 { 71 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 72 73 writel(BM_USBPHY_CTRL_CLKGATE, 74 phy->io_priv + HW_USBPHY_CTRL_SET); 75 76 clk_disable_unprepare(mxs_phy->clk); 77 } 78 79 static int mxs_phy_suspend(struct usb_phy *x, int suspend) 80 { 81 struct mxs_phy *mxs_phy = to_mxs_phy(x); 82 83 if (suspend) { 84 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD); 85 writel(BM_USBPHY_CTRL_CLKGATE, 86 x->io_priv + HW_USBPHY_CTRL_SET); 87 clk_disable_unprepare(mxs_phy->clk); 88 } else { 89 clk_prepare_enable(mxs_phy->clk); 90 writel(BM_USBPHY_CTRL_CLKGATE, 91 x->io_priv + HW_USBPHY_CTRL_CLR); 92 writel(0, x->io_priv + HW_USBPHY_PWD); 93 } 94 95 return 0; 96 } 97 98 static int mxs_phy_on_connect(struct usb_phy *phy, 99 enum usb_device_speed speed) 100 { 101 dev_dbg(phy->dev, "%s speed device has connected\n", 102 (speed == USB_SPEED_HIGH) ? "high" : "non-high"); 103 104 if (speed == USB_SPEED_HIGH) 105 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, 106 phy->io_priv + HW_USBPHY_CTRL_SET); 107 108 return 0; 109 } 110 111 static int mxs_phy_on_disconnect(struct usb_phy *phy, 112 enum usb_device_speed speed) 113 { 114 dev_dbg(phy->dev, "%s speed device has disconnected\n", 115 (speed == USB_SPEED_HIGH) ? "high" : "non-high"); 116 117 if (speed == USB_SPEED_HIGH) 118 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, 119 phy->io_priv + HW_USBPHY_CTRL_CLR); 120 121 return 0; 122 } 123 124 static int mxs_phy_probe(struct platform_device *pdev) 125 { 126 struct resource *res; 127 void __iomem *base; 128 struct clk *clk; 129 struct mxs_phy *mxs_phy; 130 int ret; 131 132 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 133 if (!res) { 134 dev_err(&pdev->dev, "can't get device resources\n"); 135 return -ENOENT; 136 } 137 138 base = devm_ioremap_resource(&pdev->dev, res); 139 if (IS_ERR(base)) 140 return PTR_ERR(base); 141 142 clk = devm_clk_get(&pdev->dev, NULL); 143 if (IS_ERR(clk)) { 144 dev_err(&pdev->dev, 145 "can't get the clock, err=%ld", PTR_ERR(clk)); 146 return PTR_ERR(clk); 147 } 148 149 mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL); 150 if (!mxs_phy) { 151 dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n"); 152 return -ENOMEM; 153 } 154 155 mxs_phy->phy.io_priv = base; 156 mxs_phy->phy.dev = &pdev->dev; 157 mxs_phy->phy.label = DRIVER_NAME; 158 mxs_phy->phy.init = mxs_phy_init; 159 mxs_phy->phy.shutdown = mxs_phy_shutdown; 160 mxs_phy->phy.set_suspend = mxs_phy_suspend; 161 mxs_phy->phy.notify_connect = mxs_phy_on_connect; 162 mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect; 163 164 ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier); 165 166 mxs_phy->clk = clk; 167 168 platform_set_drvdata(pdev, &mxs_phy->phy); 169 170 ret = usb_add_phy_dev(&mxs_phy->phy); 171 if (ret) 172 return ret; 173 174 return 0; 175 } 176 177 static int mxs_phy_remove(struct platform_device *pdev) 178 { 179 struct mxs_phy *mxs_phy = platform_get_drvdata(pdev); 180 181 usb_remove_phy(&mxs_phy->phy); 182 183 platform_set_drvdata(pdev, NULL); 184 185 return 0; 186 } 187 188 static const struct of_device_id mxs_phy_dt_ids[] = { 189 { .compatible = "fsl,imx23-usbphy", }, 190 { /* sentinel */ } 191 }; 192 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids); 193 194 static struct platform_driver mxs_phy_driver = { 195 .probe = mxs_phy_probe, 196 .remove = mxs_phy_remove, 197 .driver = { 198 .name = DRIVER_NAME, 199 .owner = THIS_MODULE, 200 .of_match_table = mxs_phy_dt_ids, 201 }, 202 }; 203 204 static int __init mxs_phy_module_init(void) 205 { 206 return platform_driver_register(&mxs_phy_driver); 207 } 208 postcore_initcall(mxs_phy_module_init); 209 210 static void __exit mxs_phy_module_exit(void) 211 { 212 platform_driver_unregister(&mxs_phy_driver); 213 } 214 module_exit(mxs_phy_module_exit); 215 216 MODULE_ALIAS("platform:mxs-usb-phy"); 217 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 218 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 219 MODULE_DESCRIPTION("Freescale MXS USB PHY driver"); 220 MODULE_LICENSE("GPL"); 221