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

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