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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 "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         ctrl_usb = dev_get_drvdata(dev);
130         if (!ctrl_usb)
131                 return NULL;
132         return &ctrl_usb->phy_ctrl;
133 }
134 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
135 
136 static int am335x_control_usb_probe(struct platform_device *pdev)
137 {
138         struct resource *res;
139         struct am335x_control_usb *ctrl_usb;
140         const struct of_device_id *of_id;
141         const struct phy_control *phy_ctrl;
142 
143         of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
144         if (!of_id)
145                 return -EINVAL;
146 
147         phy_ctrl = of_id->data;
148 
149         ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
150         if (!ctrl_usb) {
151                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
152                 return -ENOMEM;
153         }
154 
155         ctrl_usb->dev = &pdev->dev;
156 
157         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
158         ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
159         if (IS_ERR(ctrl_usb->phy_reg))
160                 return PTR_ERR(ctrl_usb->phy_reg);
161 
162         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
163         ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
164         if (IS_ERR(ctrl_usb->wkup))
165                 return PTR_ERR(ctrl_usb->wkup);
166 
167         spin_lock_init(&ctrl_usb->lock);
168         ctrl_usb->phy_ctrl = *phy_ctrl;
169 
170         dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
171         return 0;
172 }
173 
174 static struct platform_driver am335x_control_driver = {
175         .probe          = am335x_control_usb_probe,
176         .driver         = {
177                 .name   = "am335x-control-usb",
178                 .owner  = THIS_MODULE,
179                 .of_match_table = omap_control_usb_id_table,
180         },
181 };
182 
183 module_platform_driver(am335x_control_driver);
184 MODULE_LICENSE("GPL v2");
185 

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