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

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