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mfd: omap-usb-host: Add device tree support and binding information

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Allows the OMAP HS USB host controller to be specified
via device tree.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Roger Quadros
2013-04-09 11:39:18 +03:00
committed by Samuel Ortiz
parent 40b0d68a8c
commit 03a8f438f5
2 changed files with 235 additions and 6 deletions
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161
drivers/mfd/omap-usb-host.c
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@@ -1,8 +1,9 @@
/**
* omap-usb-host.c - The USBHS core driver for OMAP EHCI & OHCI
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
* Copyright (C) 2011-2013 Texas Instruments Incorporated - http://www.ti.com
* Author: Keshava Munegowda <keshava_mgowda@ti.com>
* Author: Roger Quadros <rogerq@ti.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
@@ -27,6 +28,8 @@
#include <linux/platform_device.h>
#include <linux/platform_data/usb-omap.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include "omap-usb.h"
@@ -137,6 +140,49 @@ static inline u8 usbhs_readb(void __iomem *base, u8 reg)
/*-------------------------------------------------------------------------*/
/**
* Map 'enum usbhs_omap_port_mode' found in <linux/platform_data/usb-omap.h>
* to the device tree binding portN-mode found in
* 'Documentation/devicetree/bindings/mfd/omap-usb-host.txt'
*/
static const char * const port_modes[] = {
[OMAP_USBHS_PORT_MODE_UNUSED] = "",
[OMAP_EHCI_PORT_MODE_PHY] = "ehci-phy",
[OMAP_EHCI_PORT_MODE_TLL] = "ehci-tll",
[OMAP_EHCI_PORT_MODE_HSIC] = "ehci-hsic",
[OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0] = "ohci-phy-6pin-datse0",
[OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM] = "ohci-phy-6pin-dpdm",
[OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0] = "ohci-phy-3pin-datse0",
[OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM] = "ohci-phy-4pin-dpdm",
[OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0] = "ohci-tll-6pin-datse0",
[OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM] = "ohci-tll-6pin-dpdm",
[OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0] = "ohci-tll-3pin-datse0",
[OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM] = "ohci-tll-4pin-dpdm",
[OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0] = "ohci-tll-2pin-datse0",
[OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM] = "ohci-tll-2pin-dpdm",
};
/**
* omap_usbhs_get_dt_port_mode - Get the 'enum usbhs_omap_port_mode'
* from the port mode string.
* @mode: The port mode string, usually obtained from device tree.
*
* The function returns the 'enum usbhs_omap_port_mode' that matches the
* provided port mode string as per the port_modes table.
* If no match is found it returns -ENODEV
*/
static const int omap_usbhs_get_dt_port_mode(const char *mode)
{
int i;
for (i = 0; i < ARRAY_SIZE(port_modes); i++) {
if (!strcmp(mode, port_modes[i]))
return i;
}
return -ENODEV;
}
static struct platform_device *omap_usbhs_alloc_child(const char *name,
struct resource *res, int num_resources, void *pdata,
size_t pdata_size, struct device *dev)
@@ -464,6 +510,58 @@ static void omap_usbhs_init(struct device *dev)
pm_runtime_put_sync(dev);
}
static int usbhs_omap_get_dt_pdata(struct device *dev,
struct usbhs_omap_platform_data *pdata)
{
int ret, i;
struct device_node *node = dev->of_node;
ret = of_property_read_u32(node, "num-ports", &pdata->nports);
if (ret)
pdata->nports = 0;
if (pdata->nports > OMAP3_HS_USB_PORTS) {
dev_warn(dev, "Too many num_ports <%d> in device tree. Max %d\n",
pdata->nports, OMAP3_HS_USB_PORTS);
return -ENODEV;
}
/* get port modes */
for (i = 0; i < OMAP3_HS_USB_PORTS; i++) {
char prop[11];
const char *mode;
pdata->port_mode[i] = OMAP_USBHS_PORT_MODE_UNUSED;
snprintf(prop, sizeof(prop), "port%d-mode", i + 1);
ret = of_property_read_string(node, prop, &mode);
if (ret < 0)
continue;
ret = omap_usbhs_get_dt_port_mode(mode);
if (ret < 0) {
dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
i, mode);
return -ENODEV;
}
dev_dbg(dev, "port%d-mode: %s -> %d\n", i, mode, ret);
pdata->port_mode[i] = ret;
}
/* get flags */
pdata->single_ulpi_bypass = of_property_read_bool(node,
"single-ulpi-bypass");
return 0;
}
static struct of_device_id usbhs_child_match_table[] = {
{ .compatible = "ti,omap-ehci", },
{ .compatible = "ti,omap-ohci", },
{ }
};
/**
* usbhs_omap_probe - initialize TI-based HCDs
*
@@ -479,18 +577,37 @@ static int usbhs_omap_probe(struct platform_device *pdev)
int i;
bool need_logic_fck;
if (dev->of_node) {
/* For DT boot we populate platform data from OF node */
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
ret = usbhs_omap_get_dt_pdata(dev, pdata);
if (ret)
return ret;
dev->platform_data = pdata;
}
if (!pdata) {
dev_err(dev, "Missing platform data\n");
return -ENODEV;
}
if (pdata->nports > OMAP3_HS_USB_PORTS) {
dev_info(dev, "Too many num_ports <%d> in platform_data. Max %d\n",
pdata->nports, OMAP3_HS_USB_PORTS);
return -ENODEV;
}
omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
if (!omap) {
dev_err(dev, "Memory allocation failed\n");
return -ENOMEM;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "uhh");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
omap->uhh_base = devm_request_and_ioremap(dev, res);
if (!omap->uhh_base) {
dev_err(dev, "Resource request/ioremap failed\n");
@@ -661,10 +778,23 @@ static int usbhs_omap_probe(struct platform_device *pdev)
}
omap_usbhs_init(dev);
ret = omap_usbhs_alloc_children(pdev);
if (ret) {
dev_err(dev, "omap_usbhs_alloc_children failed\n");
goto err_alloc;
if (dev->of_node) {
ret = of_platform_populate(dev->of_node,
usbhs_child_match_table, NULL, dev);
if (ret) {
dev_err(dev, "Failed to create DT children: %d\n", ret);
goto err_alloc;
}
} else {
ret = omap_usbhs_alloc_children(pdev);
if (ret) {
dev_err(dev, "omap_usbhs_alloc_children failed: %d\n",
ret);
goto err_alloc;
}
}
return 0;
@@ -703,6 +833,13 @@ err_mem:
return ret;
}
static int usbhs_omap_remove_child(struct device *dev, void *data)
{
dev_info(dev, "unregistering\n");
platform_device_unregister(to_platform_device(dev));
return 0;
}
/**
* usbhs_omap_remove - shutdown processing for UHH & TLL HCDs
* @pdev: USB Host Controller being removed
@@ -734,6 +871,8 @@ static int usbhs_omap_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
/* remove children */
device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
return 0;
}
@@ -742,16 +881,26 @@ static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
.runtime_resume = usbhs_runtime_resume,
};
static const struct of_device_id usbhs_omap_dt_ids[] = {
{ .compatible = "ti,usbhs-host" },
{ }
};
MODULE_DEVICE_TABLE(of, usbhs_omap_dt_ids);
static struct platform_driver usbhs_omap_driver = {
.driver = {
.name = (char *)usbhs_driver_name,
.owner = THIS_MODULE,
.pm = &usbhsomap_dev_pm_ops,
.of_match_table = of_match_ptr(usbhs_omap_dt_ids),
},
.remove = usbhs_omap_remove,
};
MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("usb host common core driver for omap EHCI and OHCI");