ARM: OMAP2+: omap-usb-host: Add usbhs_init_phys()

This helper allows board support code to add the PHY's
VCC and RESET regulators which are GPIO controlled as well
as the NOP PHY device.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/usb-host.c b/arch/arm/mach-omap2/usb-host.c
index 5706bdccf45ee34b643141337b38222fbaf5f63a..aa27d7f5cbb7a760596337903fd0e61ac22e647b 100644 (file)
--- a/arch/arm/mach-omap2/usb-host.c
+++ b/arch/arm/mach-omap2/usb-host.c
@@ -22,8 +22,12 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/dma-mapping.h>
-
-#include <asm/io.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/fixed.h>
+#include <linux/string.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/usb/phy.h>
 
 #include "soc.h"
 #include "omap_device.h"
@@ -526,3 +530,155 @@ void __init usbhs_init(struct usbhs_omap_platform_data *pdata)
 }
 
 #endif
+
+/* Template for PHY regulators */
+static struct fixed_voltage_config hsusb_reg_config = {
+       /* .supply_name filled later */
+       .microvolts = 3300000,
+       .gpio = -1,             /* updated later */
+       .startup_delay = 70000, /* 70msec */
+       .enable_high = 1,       /* updated later */
+       .enabled_at_boot = 0,   /* keep in RESET */
+       /* .init_data filled later */
+};
+
+static const char *nop_name = "nop_usb_xceiv"; /* NOP PHY driver */
+static const char *reg_name = "reg-fixed-voltage"; /* Regulator driver */
+
+/**
+ * usbhs_add_regulator - Add a gpio based fixed voltage regulator device
+ * @name: name for the regulator
+ * @dev_id: device id of the device this regulator supplies power to
+ * @dev_supply: supply name that the device expects
+ * @gpio: GPIO number
+ * @polarity: 1 - Active high, 0 - Active low
+ */
+static int usbhs_add_regulator(char *name, char *dev_id, char *dev_supply,
+                                               int gpio, int polarity)
+{
+       struct regulator_consumer_supply *supplies;
+       struct regulator_init_data *reg_data;
+       struct fixed_voltage_config *config;
+       struct platform_device *pdev;
+       int ret;
+
+       supplies = kzalloc(sizeof(*supplies), GFP_KERNEL);
+       if (!supplies)
+               return -ENOMEM;
+
+       supplies->supply = dev_supply;
+       supplies->dev_name = dev_id;
+
+       reg_data = kzalloc(sizeof(*reg_data), GFP_KERNEL);
+       if (!reg_data)
+               return -ENOMEM;
+
+       reg_data->constraints.valid_ops_mask = REGULATOR_CHANGE_STATUS;
+       reg_data->consumer_supplies = supplies;
+       reg_data->num_consumer_supplies = 1;
+
+       config = kmemdup(&hsusb_reg_config, sizeof(hsusb_reg_config),
+                       GFP_KERNEL);
+       if (!config)
+               return -ENOMEM;
+
+       config->supply_name = name;
+       config->gpio = gpio;
+       config->enable_high = polarity;
+       config->init_data = reg_data;
+
+       /* create a regulator device */
+       pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
+       if (!pdev)
+               return -ENOMEM;
+
+       pdev->id = PLATFORM_DEVID_AUTO;
+       pdev->name = reg_name;
+       pdev->dev.platform_data = config;
+
+       ret = platform_device_register(pdev);
+       if (ret)
+               pr_err("%s: Failed registering regulator %s for %s\n",
+                               __func__, name, dev_id);
+
+       return ret;
+}
+
+int usbhs_init_phys(struct usbhs_phy_data *phy, int num_phys)
+{
+       char *rail_name;
+       int i, len;
+       struct platform_device *pdev;
+       char *phy_id;
+
+       /* the phy_id will be something like "nop_usb_xceiv.1" */
+       len = strlen(nop_name) + 3; /* 3 -> ".1" and NULL terminator */
+
+       for (i = 0; i < num_phys; i++) {
+
+               if (!phy->port) {
+                       pr_err("%s: Invalid port 0. Must start from 1\n",
+                                               __func__);
+                       continue;
+               }
+
+               /* do we need a NOP PHY device ? */
+               if (!gpio_is_valid(phy->reset_gpio) &&
+                       !gpio_is_valid(phy->vcc_gpio))
+                       continue;
+
+               /* create a NOP PHY device */
+               pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
+               if (!pdev)
+                       return -ENOMEM;
+
+               pdev->id = phy->port;
+               pdev->name = nop_name;
+               pdev->dev.platform_data = phy->platform_data;
+
+               phy_id = kmalloc(len, GFP_KERNEL);
+               if (!phy_id)
+                       return -ENOMEM;
+
+               scnprintf(phy_id, len, "nop_usb_xceiv.%d\n",
+                                       pdev->id);
+
+               if (platform_device_register(pdev)) {
+                       pr_err("%s: Failed to register device %s\n",
+                               __func__,  phy_id);
+                       continue;
+               }
+
+               usb_bind_phy("ehci-omap.0", phy->port - 1, phy_id);
+
+               /* Do we need RESET regulator ? */
+               if (gpio_is_valid(phy->reset_gpio)) {
+
+                       rail_name = kmalloc(13, GFP_KERNEL);
+                       if (!rail_name)
+                               return -ENOMEM;
+
+                       scnprintf(rail_name, 13, "hsusb%d_reset", phy->port);
+
+                       usbhs_add_regulator(rail_name, phy_id, "reset",
+                                               phy->reset_gpio, 1);
+               }
+
+               /* Do we need VCC regulator ? */
+               if (gpio_is_valid(phy->vcc_gpio)) {
+
+                       rail_name = kmalloc(13, GFP_KERNEL);
+                       if (!rail_name)
+                               return -ENOMEM;
+
+                       scnprintf(rail_name, 13, "hsusb%d_vcc", phy->port);
+
+                       usbhs_add_regulator(rail_name, phy_id, "vcc",
+                                       phy->vcc_gpio, phy->vcc_polarity);
+               }
+
+               phy++;
+       }
+
+       return 0;
+}

diff --git a/arch/arm/mach-omap2/usb.h b/arch/arm/mach-omap2/usb.h
index 3319f5cf47a3aade4bdf79ba9605e3cdc183ee6f..e7261ebcf7b02ba83c4e4fe672d132636aeb841e 100644 (file)
--- a/arch/arm/mach-omap2/usb.h
+++ b/arch/arm/mach-omap2/usb.h
@@ -53,8 +53,17 @@
 #define USBPHY_OTGSESSEND_EN   (1 << 20)
 #define USBPHY_DATA_POLARITY   (1 << 23)
 
+struct usbhs_phy_data {
+       int port;               /* 1 indexed port number */
+       int reset_gpio;
+       int vcc_gpio;
+       bool vcc_polarity;      /* 1 active high, 0 active low */
+       void *platform_data;
+};
+
 extern void usb_musb_init(struct omap_musb_board_data *board_data);
 extern void usbhs_init(struct usbhs_omap_platform_data *pdata);
+extern int usbhs_init_phys(struct usbhs_phy_data *phy, int num_phys);
 
 extern void am35x_musb_reset(void);
 extern void am35x_musb_phy_power(u8 on);