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usb: phy: Add AM335x PHY driver
This driver is a redo of my earlier attempt. It uses parts of the generic PHY driver and uses the new control driver for the register the phy needs to power on/off the phy. It also enables easy access for the wakeup register which is not yet implemented. The difference between the omap attempt is: - no static holding variable - one global visible function which exports a struct with callbacks to access the "control" registers. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
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53b6fc28ea
commit
3bb869c8b3
@ -86,6 +86,18 @@ config OMAP_USB3
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This driver interacts with the "OMAP Control USB Driver" to power
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on/off the PHY.
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config AM335X_CONTROL_USB
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tristate
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config AM335X_PHY_USB
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tristate "AM335x USB PHY Driver"
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select USB_PHY
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select AM335X_CONTROL_USB
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select NOP_USB_XCEIV
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help
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This driver provides PHY support for that phy which part for the
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AM335x SoC.
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config SAMSUNG_USBPHY
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tristate
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help
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@ -16,6 +16,8 @@ obj-$(CONFIG_ISP1301_OMAP) += phy-isp1301-omap.o
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obj-$(CONFIG_MV_U3D_PHY) += phy-mv-u3d-usb.o
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obj-$(CONFIG_NOP_USB_XCEIV) += phy-generic.o
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obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o
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obj-$(CONFIG_AM335X_CONTROL_USB) += phy-am335x-control.o
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obj-$(CONFIG_AM335X_PHY_USB) += phy-am335x.o
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obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
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obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o
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obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o
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21
drivers/usb/phy/am35x-phy-control.h
Normal file
21
drivers/usb/phy/am35x-phy-control.h
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@ -0,0 +1,21 @@
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#ifndef _AM335x_PHY_CONTROL_H_
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#define _AM335x_PHY_CONTROL_H_
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struct phy_control {
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void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
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void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
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};
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static inline void phy_ctrl_power(struct phy_control *phy_ctrl, u32 id, bool on)
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{
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phy_ctrl->phy_power(phy_ctrl, id, on);
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}
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static inline void phy_ctrl_wkup(struct phy_control *phy_ctrl, u32 id, bool on)
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{
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phy_ctrl->phy_wkup(phy_ctrl, id, on);
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}
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struct phy_control *am335x_get_phy_control(struct device *dev);
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#endif
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136
drivers/usb/phy/phy-am335x-control.c
Normal file
136
drivers/usb/phy/phy-am335x-control.c
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@ -0,0 +1,136 @@
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/io.h>
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struct phy_control {
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void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
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void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
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};
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struct am335x_control_usb {
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struct device *dev;
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void __iomem *phy_reg;
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void __iomem *wkup;
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spinlock_t lock;
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struct phy_control phy_ctrl;
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};
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#define AM335X_USB0_CTRL 0x0
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#define AM335X_USB1_CTRL 0x8
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#define AM335x_USB_WKUP 0x0
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#define USBPHY_CM_PWRDN (1 << 0)
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#define USBPHY_OTG_PWRDN (1 << 1)
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#define USBPHY_OTGVDET_EN (1 << 19)
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#define USBPHY_OTGSESSEND_EN (1 << 20)
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static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
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{
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struct am335x_control_usb *usb_ctrl;
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u32 val;
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u32 reg;
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usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
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switch (id) {
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case 0:
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reg = AM335X_USB0_CTRL;
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break;
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case 1:
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reg = AM335X_USB1_CTRL;
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break;
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default:
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__WARN();
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return;
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}
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val = readl(usb_ctrl->phy_reg + reg);
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if (on) {
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val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
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val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
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} else {
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val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
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}
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writel(val, usb_ctrl->phy_reg + reg);
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}
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static const struct phy_control ctrl_am335x = {
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.phy_power = am335x_phy_power,
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};
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static const struct of_device_id omap_control_usb_id_table[] = {
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{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
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{}
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};
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MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
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static struct platform_driver am335x_control_driver;
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static int match(struct device *dev, void *data)
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{
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struct device_node *node = (struct device_node *)data;
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return dev->of_node == node &&
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dev->driver == &am335x_control_driver.driver;
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}
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struct phy_control *am335x_get_phy_control(struct device *dev)
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{
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struct device_node *node;
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struct am335x_control_usb *ctrl_usb;
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node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
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if (!node)
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return NULL;
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dev = bus_find_device(&platform_bus_type, NULL, node, match);
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ctrl_usb = dev_get_drvdata(dev);
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if (!ctrl_usb)
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return NULL;
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return &ctrl_usb->phy_ctrl;
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}
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EXPORT_SYMBOL_GPL(am335x_get_phy_control);
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static int am335x_control_usb_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct am335x_control_usb *ctrl_usb;
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const struct of_device_id *of_id;
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const struct phy_control *phy_ctrl;
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of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
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if (!of_id)
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return -EINVAL;
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phy_ctrl = of_id->data;
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ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
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if (!ctrl_usb) {
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dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
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return -ENOMEM;
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}
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ctrl_usb->dev = &pdev->dev;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
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ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(ctrl_usb->phy_reg))
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return PTR_ERR(ctrl_usb->phy_reg);
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spin_lock_init(&ctrl_usb->lock);
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ctrl_usb->phy_ctrl = *phy_ctrl;
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dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
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return 0;
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}
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static struct platform_driver am335x_control_driver = {
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.probe = am335x_control_usb_probe,
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.driver = {
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.name = "am335x-control-usb",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(omap_control_usb_id_table),
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},
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};
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module_platform_driver(am335x_control_driver);
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MODULE_LICENSE("GPL v2");
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99
drivers/usb/phy/phy-am335x.c
Normal file
99
drivers/usb/phy/phy-am335x.c
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@ -0,0 +1,99 @@
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/usb_phy_gen_xceiv.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/regulator/consumer.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include "am35x-phy-control.h"
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#include "phy-generic.h"
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struct am335x_phy {
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struct usb_phy_gen_xceiv usb_phy_gen;
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struct phy_control *phy_ctrl;
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int id;
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};
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static int am335x_init(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
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return 0;
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}
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static void am335x_shutdown(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
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}
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static int am335x_phy_probe(struct platform_device *pdev)
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{
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struct am335x_phy *am_phy;
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struct device *dev = &pdev->dev;
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int ret;
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am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
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if (!am_phy)
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return -ENOMEM;
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am_phy->phy_ctrl = am335x_get_phy_control(dev);
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if (!am_phy->phy_ctrl)
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return -EPROBE_DEFER;
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am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
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if (am_phy->id < 0) {
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dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
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return am_phy->id;
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}
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ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen,
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USB_PHY_TYPE_USB2, 0, false, false);
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if (ret)
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return ret;
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ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
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if (ret)
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goto err_add;
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am_phy->usb_phy_gen.phy.init = am335x_init;
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am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
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platform_set_drvdata(pdev, am_phy);
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return 0;
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err_add:
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usb_phy_gen_cleanup_phy(&am_phy->usb_phy_gen);
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return ret;
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}
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static int am335x_phy_remove(struct platform_device *pdev)
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{
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struct am335x_phy *am_phy = platform_get_drvdata(pdev);
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usb_remove_phy(&am_phy->usb_phy_gen.phy);
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return 0;
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}
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static const struct of_device_id am335x_phy_ids[] = {
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{ .compatible = "ti,am335x-usb-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, am335x_phy_ids);
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static struct platform_driver am335x_phy_driver = {
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.probe = am335x_phy_probe,
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.remove = am335x_phy_remove,
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.driver = {
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.name = "am335x-phy-driver",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(am335x_phy_ids),
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},
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};
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module_platform_driver(am335x_phy_driver);
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MODULE_LICENSE("GPL v2");
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