1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/module.h> 3 #include <linux/platform_device.h> 4 #include <linux/err.h> 5 #include <linux/of.h> 6 #include <linux/io.h> 7 #include <linux/delay.h> 8 #include <linux/usb/otg.h> 9 #include "phy-am335x-control.h" 10 11 struct am335x_control_usb { 12 struct device *dev; 13 void __iomem *phy_reg; 14 void __iomem *wkup; 15 spinlock_t lock; 16 struct phy_control phy_ctrl; 17 }; 18 19 #define AM335X_USB0_CTRL 0x0 20 #define AM335X_USB1_CTRL 0x8 21 #define AM335x_USB_WKUP 0x0 22 23 #define USBPHY_CM_PWRDN (1 << 0) 24 #define USBPHY_OTG_PWRDN (1 << 1) 25 #define USBPHY_OTGVDET_EN (1 << 19) 26 #define USBPHY_OTGSESSEND_EN (1 << 20) 27 28 #define AM335X_PHY0_WK_EN (1 << 0) 29 #define AM335X_PHY1_WK_EN (1 << 8) 30 31 static void am335x_phy_wkup(struct phy_control *phy_ctrl, u32 id, bool on) 32 { 33 struct am335x_control_usb *usb_ctrl; 34 u32 val; 35 u32 reg; 36 37 usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl); 38 39 switch (id) { 40 case 0: 41 reg = AM335X_PHY0_WK_EN; 42 break; 43 case 1: 44 reg = AM335X_PHY1_WK_EN; 45 break; 46 default: 47 WARN_ON(1); 48 return; 49 } 50 51 spin_lock(&usb_ctrl->lock); 52 val = readl(usb_ctrl->wkup); 53 54 if (on) 55 val |= reg; 56 else 57 val &= ~reg; 58 59 writel(val, usb_ctrl->wkup); 60 spin_unlock(&usb_ctrl->lock); 61 } 62 63 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, 64 enum usb_dr_mode dr_mode, bool on) 65 { 66 struct am335x_control_usb *usb_ctrl; 67 u32 val; 68 u32 reg; 69 70 usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl); 71 72 switch (id) { 73 case 0: 74 reg = AM335X_USB0_CTRL; 75 break; 76 case 1: 77 reg = AM335X_USB1_CTRL; 78 break; 79 default: 80 WARN_ON(1); 81 return; 82 } 83 84 val = readl(usb_ctrl->phy_reg + reg); 85 if (on) { 86 if (dr_mode == USB_DR_MODE_HOST) { 87 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN | 88 USBPHY_OTGVDET_EN); 89 val |= USBPHY_OTGSESSEND_EN; 90 } else { 91 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN); 92 val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN; 93 } 94 } else { 95 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN; 96 } 97 98 writel(val, usb_ctrl->phy_reg + reg); 99 100 /* 101 * Give the PHY ~1ms to complete the power up operation. 102 * Tests have shown unstable behaviour if other USB PHY related 103 * registers are written too shortly after such a transition. 104 */ 105 if (on) 106 mdelay(1); 107 } 108 109 static const struct phy_control ctrl_am335x = { 110 .phy_power = am335x_phy_power, 111 .phy_wkup = am335x_phy_wkup, 112 }; 113 114 static const struct of_device_id omap_control_usb_id_table[] = { 115 { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x }, 116 {} 117 }; 118 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table); 119 120 static struct platform_driver am335x_control_driver; 121 static int match(struct device *dev, const void *data) 122 { 123 const struct device_node *node = (const struct device_node *)data; 124 return dev->of_node == node && 125 dev->driver == &am335x_control_driver.driver; 126 } 127 128 struct phy_control *am335x_get_phy_control(struct device *dev) 129 { 130 struct device_node *node; 131 struct am335x_control_usb *ctrl_usb; 132 133 node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0); 134 if (!node) 135 return NULL; 136 137 dev = bus_find_device(&platform_bus_type, NULL, node, match); 138 of_node_put(node); 139 if (!dev) 140 return NULL; 141 142 ctrl_usb = dev_get_drvdata(dev); 143 put_device(dev); 144 if (!ctrl_usb) 145 return NULL; 146 return &ctrl_usb->phy_ctrl; 147 } 148 EXPORT_SYMBOL_GPL(am335x_get_phy_control); 149 150 static int am335x_control_usb_probe(struct platform_device *pdev) 151 { 152 struct am335x_control_usb *ctrl_usb; 153 const struct of_device_id *of_id; 154 const struct phy_control *phy_ctrl; 155 156 of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node); 157 if (!of_id) 158 return -EINVAL; 159 160 phy_ctrl = of_id->data; 161 162 ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL); 163 if (!ctrl_usb) 164 return -ENOMEM; 165 166 ctrl_usb->dev = &pdev->dev; 167 168 ctrl_usb->phy_reg = devm_platform_ioremap_resource_byname(pdev, "phy_ctrl"); 169 if (IS_ERR(ctrl_usb->phy_reg)) 170 return PTR_ERR(ctrl_usb->phy_reg); 171 172 ctrl_usb->wkup = devm_platform_ioremap_resource_byname(pdev, "wakeup"); 173 if (IS_ERR(ctrl_usb->wkup)) 174 return PTR_ERR(ctrl_usb->wkup); 175 176 spin_lock_init(&ctrl_usb->lock); 177 ctrl_usb->phy_ctrl = *phy_ctrl; 178 179 dev_set_drvdata(ctrl_usb->dev, ctrl_usb); 180 return 0; 181 } 182 183 static struct platform_driver am335x_control_driver = { 184 .probe = am335x_control_usb_probe, 185 .driver = { 186 .name = "am335x-control-usb", 187 .of_match_table = omap_control_usb_id_table, 188 }, 189 }; 190 191 module_platform_driver(am335x_control_driver); 192 MODULE_LICENSE("GPL v2"); 193