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 int mxs_phy_hw_init(struct mxs_phy *mxs_phy) 45 { 46 int ret; 47 void __iomem *base = mxs_phy->phy.io_priv; 48 49 ret = stmp_reset_block(base + HW_USBPHY_CTRL); 50 if (ret) 51 return ret; 52 53 /* Power up the PHY */ 54 writel(0, base + HW_USBPHY_PWD); 55 56 /* enable FS/LS device */ 57 writel(BM_USBPHY_CTRL_ENUTMILEVEL2 | 58 BM_USBPHY_CTRL_ENUTMILEVEL3, 59 base + HW_USBPHY_CTRL_SET); 60 61 return 0; 62 } 63 64 static int mxs_phy_init(struct usb_phy *phy) 65 { 66 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 67 68 clk_prepare_enable(mxs_phy->clk); 69 return mxs_phy_hw_init(mxs_phy); 70 } 71 72 static void mxs_phy_shutdown(struct usb_phy *phy) 73 { 74 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 75 76 writel(BM_USBPHY_CTRL_CLKGATE, 77 phy->io_priv + HW_USBPHY_CTRL_SET); 78 79 clk_disable_unprepare(mxs_phy->clk); 80 } 81 82 static int mxs_phy_suspend(struct usb_phy *x, int suspend) 83 { 84 struct mxs_phy *mxs_phy = to_mxs_phy(x); 85 86 if (suspend) { 87 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD); 88 writel(BM_USBPHY_CTRL_CLKGATE, 89 x->io_priv + HW_USBPHY_CTRL_SET); 90 clk_disable_unprepare(mxs_phy->clk); 91 } else { 92 clk_prepare_enable(mxs_phy->clk); 93 writel(BM_USBPHY_CTRL_CLKGATE, 94 x->io_priv + HW_USBPHY_CTRL_CLR); 95 writel(0, x->io_priv + HW_USBPHY_PWD); 96 } 97 98 return 0; 99 } 100 101 static int mxs_phy_on_connect(struct usb_phy *phy, 102 enum usb_device_speed speed) 103 { 104 dev_dbg(phy->dev, "%s speed device has connected\n", 105 (speed == USB_SPEED_HIGH) ? "high" : "non-high"); 106 107 if (speed == USB_SPEED_HIGH) 108 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, 109 phy->io_priv + HW_USBPHY_CTRL_SET); 110 111 return 0; 112 } 113 114 static int mxs_phy_on_disconnect(struct usb_phy *phy, 115 enum usb_device_speed speed) 116 { 117 dev_dbg(phy->dev, "%s speed device has disconnected\n", 118 (speed == USB_SPEED_HIGH) ? "high" : "non-high"); 119 120 if (speed == USB_SPEED_HIGH) 121 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, 122 phy->io_priv + HW_USBPHY_CTRL_CLR); 123 124 return 0; 125 } 126 127 static int mxs_phy_probe(struct platform_device *pdev) 128 { 129 struct resource *res; 130 void __iomem *base; 131 struct clk *clk; 132 struct mxs_phy *mxs_phy; 133 int ret; 134 135 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 136 base = devm_ioremap_resource(&pdev->dev, res); 137 if (IS_ERR(base)) 138 return PTR_ERR(base); 139 140 clk = devm_clk_get(&pdev->dev, NULL); 141 if (IS_ERR(clk)) { 142 dev_err(&pdev->dev, 143 "can't get the clock, err=%ld", PTR_ERR(clk)); 144 return PTR_ERR(clk); 145 } 146 147 mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL); 148 if (!mxs_phy) { 149 dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n"); 150 return -ENOMEM; 151 } 152 153 mxs_phy->phy.io_priv = base; 154 mxs_phy->phy.dev = &pdev->dev; 155 mxs_phy->phy.label = DRIVER_NAME; 156 mxs_phy->phy.init = mxs_phy_init; 157 mxs_phy->phy.shutdown = mxs_phy_shutdown; 158 mxs_phy->phy.set_suspend = mxs_phy_suspend; 159 mxs_phy->phy.notify_connect = mxs_phy_on_connect; 160 mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect; 161 mxs_phy->phy.type = USB_PHY_TYPE_USB2; 162 163 ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier); 164 165 mxs_phy->clk = clk; 166 167 platform_set_drvdata(pdev, mxs_phy); 168 169 ret = usb_add_phy_dev(&mxs_phy->phy); 170 if (ret) 171 return ret; 172 173 return 0; 174 } 175 176 static int mxs_phy_remove(struct platform_device *pdev) 177 { 178 struct mxs_phy *mxs_phy = platform_get_drvdata(pdev); 179 180 usb_remove_phy(&mxs_phy->phy); 181 182 return 0; 183 } 184 185 static const struct of_device_id mxs_phy_dt_ids[] = { 186 { .compatible = "fsl,imx23-usbphy", }, 187 { /* sentinel */ } 188 }; 189 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids); 190 191 static struct platform_driver mxs_phy_driver = { 192 .probe = mxs_phy_probe, 193 .remove = mxs_phy_remove, 194 .driver = { 195 .name = DRIVER_NAME, 196 .owner = THIS_MODULE, 197 .of_match_table = mxs_phy_dt_ids, 198 }, 199 }; 200 201 static int __init mxs_phy_module_init(void) 202 { 203 return platform_driver_register(&mxs_phy_driver); 204 } 205 postcore_initcall(mxs_phy_module_init); 206 207 static void __exit mxs_phy_module_exit(void) 208 { 209 platform_driver_unregister(&mxs_phy_driver); 210 } 211 module_exit(mxs_phy_module_exit); 212 213 MODULE_ALIAS("platform:mxs-usb-phy"); 214 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 215 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 216 MODULE_DESCRIPTION("Freescale MXS USB PHY driver"); 217 MODULE_LICENSE("GPL"); 218