drivers/usb/phy/phy-am335x-control.c

   1 #include <linux/module.h>
   2 #include <linux/platform_device.h>
   3 #include <linux/err.h>
   4 #include <linux/of.h>
   5 #include <linux/io.h>
   6 #include <linux/delay.h>
   7 #include "am35x-phy-control.h"
   8
   9 struct am335x_control_usb {
  10         struct device *dev;
  11         void __iomem *phy_reg;
  12         void __iomem *wkup;
  13         spinlock_t lock;
  14         struct phy_control phy_ctrl;
  15 };
  16
  17 #define AM335X_USB0_CTRL                0x0
  18 #define AM335X_USB1_CTRL                0x8
  19 #define AM335x_USB_WKUP                 0x0
  20
  21 #define USBPHY_CM_PWRDN         (1 << 0)
  22 #define USBPHY_OTG_PWRDN        (1 << 1)
  23 #define USBPHY_OTGVDET_EN       (1 << 19)
  24 #define USBPHY_OTGSESSEND_EN    (1 << 20)
  25
  26 #define AM335X_PHY0_WK_EN       (1 << 0)
  27 #define AM335X_PHY1_WK_EN       (1 << 8)
  28
  29 static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
  30 {
  31         struct am335x_control_usb *usb_ctrl;
  32         u32 val;
  33         u32 reg;
  34
  35         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  36
  37         switch (id) {
  38         case 0:
  39                 reg = AM335X_PHY0_WK_EN;
  40                 break;
  41         case 1:
  42                 reg = AM335X_PHY1_WK_EN;
  43                 break;
  44         default:
  45                 WARN_ON(1);
  46                 return;
  47         }
  48
  49         spin_lock(&usb_ctrl->lock);
  50         val = readl(usb_ctrl->wkup);
  51
  52         if (on)
  53                 val |= reg;
  54         else
  55                 val &= ~reg;
  56
  57         writel(val, usb_ctrl->wkup);
  58         spin_unlock(&usb_ctrl->lock);
  59 }
  60
  61 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
  62 {
  63         struct am335x_control_usb *usb_ctrl;
  64         u32 val;
  65         u32 reg;
  66
  67         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  68
  69         switch (id) {
  70         case 0:
  71                 reg = AM335X_USB0_CTRL;
  72                 break;
  73         case 1:
  74                 reg = AM335X_USB1_CTRL;
  75                 break;
  76         default:
  77                 WARN_ON(1);
  78                 return;
  79         }
  80
  81         val = readl(usb_ctrl->phy_reg + reg);
  82         if (on) {
  83                 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
  84                 val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
  85         } else {
  86                 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
  87         }
  88
  89         writel(val, usb_ctrl->phy_reg + reg);
  90
  91         /*
  92          * Give the PHY ~1ms to complete the power up operation.
  93          * Tests have shown unstable behaviour if other USB PHY related
  94          * registers are written too shortly after such a transition.
  95          */
  96         if (on)
  97                 mdelay(1);
  98 }
  99
 100 static const struct phy_control ctrl_am335x = {
 101         .phy_power = am335x_phy_power,
 102         .phy_wkup = am335x_phy_wkup,
 103 };
 104
 105 static const struct of_device_id omap_control_usb_id_table[] = {
 106         { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
 107         {}
 108 };
 109 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 110
 111 static struct platform_driver am335x_control_driver;
 112 static int match(struct device *dev, void *data)
 113 {
 114         struct device_node *node = (struct device_node *)data;
 115         return dev->of_node == node &&
 116                 dev->driver == &am335x_control_driver.driver;
 117 }
 118
 119 struct phy_control *am335x_get_phy_control(struct device *dev)
 120 {
 121         struct device_node *node;
 122         struct am335x_control_usb *ctrl_usb;
 123
 124         node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
 125         if (!node)
 126                 return NULL;
 127
 128         dev = bus_find_device(&platform_bus_type, NULL, node, match);
 129         if (!dev)
 130                 return NULL;
 131
 132         ctrl_usb = dev_get_drvdata(dev);
 133         if (!ctrl_usb)
 134                 return NULL;
 135         return &ctrl_usb->phy_ctrl;
 136 }
 137 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
 138
 139 static int am335x_control_usb_probe(struct platform_device *pdev)
 140 {
 141         struct resource *res;
 142         struct am335x_control_usb *ctrl_usb;
 143         const struct of_device_id *of_id;
 144         const struct phy_control *phy_ctrl;
 145
 146         if (!try_module_get(pdev->dev.parent->driver->owner))
 147                 return -EPROBE_DEFER;
 148
 149         of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
 150         if (!of_id)
 151                 return -EINVAL;
 152
 153         phy_ctrl = of_id->data;
 154
 155         ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
 156         if (!ctrl_usb)
 157                 return -ENOMEM;
 158
 159         ctrl_usb->dev = &pdev->dev;
 160
 161         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 162         ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
 163         if (IS_ERR(ctrl_usb->phy_reg))
 164                 return PTR_ERR(ctrl_usb->phy_reg);
 165
 166         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
 167         ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
 168         if (IS_ERR(ctrl_usb->wkup))
 169                 return PTR_ERR(ctrl_usb->wkup);
 170
 171         spin_lock_init(&ctrl_usb->lock);
 172         ctrl_usb->phy_ctrl = *phy_ctrl;
 173
 174         dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
 175         return 0;
 176 }
 177
 178 static int am335x_control_usb_remove(struct platform_device *pdev)
 179 {
 180         module_put(pdev->dev.parent->driver->owner);
 181         return 0;
 182 }
 183
 184 static struct platform_driver am335x_control_driver = {
 185         .probe          = am335x_control_usb_probe,
 186         .remove         = am335x_control_usb_remove,
 187         .driver         = {
 188                 .name   = "am335x-control-usb",
 189                 .of_match_table = omap_control_usb_id_table,
 190         },
 191 };
 192
 193 module_platform_driver(am335x_control_driver);
 194 MODULE_LICENSE("GPL v2");