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USB: ehci-tegra: add probing through device tree 

Rely on platform_data being passed through auxdata for now; more elaborate
bindings for phy config and tunings to be added.

v2: moved vbus-gpio check to the helper function, added check for !of_node,
    added usb2 clock to board-dt table.

Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Olof Johansson 2011-11-04 09:12:40 +00:00
parent c27317c0ed
commit 4a53f4e692
2 changed files with 80 additions and 0 deletions
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9
arch/arm/mach-tegra/board-dt.c
View File

@ -61,12 +61,21 @@ struct of_dev_auxdata tegra20_auxdata_lookup[] __initdata = {
OF_DEV_AUXDATA("nvidia,tegra20-i2s", TEGRA_I2S1_BASE, "tegra-i2s.0", NULL),
OF_DEV_AUXDATA("nvidia,tegra20-i2s", TEGRA_I2S1_BASE, "tegra-i2s.1", NULL),
OF_DEV_AUXDATA("nvidia,tegra20-das", TEGRA_APB_MISC_DAS_BASE, "tegra-das", NULL),
OF_DEV_AUXDATA("nvidia,tegra20-ehci", TEGRA_USB_BASE, "tegra-ehci.0",
&tegra_ehci1_device.dev.platform_data),
OF_DEV_AUXDATA("nvidia,tegra20-ehci", TEGRA_USB2_BASE, "tegra-ehci.1",
&tegra_ehci2_device.dev.platform_data),
OF_DEV_AUXDATA("nvidia,tegra20-ehci", TEGRA_USB3_BASE, "tegra-ehci.2",
&tegra_ehci3_device.dev.platform_data),
{}
};
static __initdata struct tegra_clk_init_table tegra_dt_clk_init_table[] = {
/* name parent rate enabled */
{ "uartd", "pll_p", 216000000, true },
{ "usbd", "clk_m", 12000000, false },
{ "usb2", "clk_m", 12000000, false },
{ "usb3", "clk_m", 12000000, false },
{ NULL, NULL, 0, 0},
};

71
drivers/usb/host/ehci-tegra.c
View File

@ -21,7 +21,12 @@
#include <linux/platform_data/tegra_usb.h>
#include <linux/irq.h>
#include <linux/usb/otg.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <mach/usb_phy.h>
#include <mach/iomap.h>
#define TEGRA_USB_DMA_ALIGN 32
@ -574,6 +579,35 @@ static const struct hc_driver tegra_ehci_hc_driver = {
.port_handed_over = ehci_port_handed_over,
};
static int setup_vbus_gpio(struct platform_device *pdev)
{
int err = 0;
int gpio;
if (!pdev->dev.of_node)
return 0;
gpio = of_get_named_gpio(pdev->dev.of_node, "nvidia,vbus-gpio", 0);
if (!gpio_is_valid(gpio))
return 0;
err = gpio_request(gpio, "vbus_gpio");
if (err) {
dev_err(&pdev->dev, "can't request vbus gpio %d", gpio);
return err;
}
err = gpio_direction_output(gpio, 1);
if (err) {
dev_err(&pdev->dev, "can't enable vbus\n");
return err;
}
gpio_set_value(gpio, 1);
return err;
}
static u64 tegra_ehci_dma_mask = DMA_BIT_MASK(32);
static int tegra_ehci_probe(struct platform_device *pdev)
{
struct resource *res;
@ -590,6 +624,15 @@ static int tegra_ehci_probe(struct platform_device *pdev)
return -EINVAL;
}
/* Right now device-tree probed devices don't get dma_mask set.
* Since shared usb code relies on it, set it here for now.
* Once we have dma capability bindings this can go away.
*/
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &tegra_ehci_dma_mask;
setup_vbus_gpio(pdev);
tegra = kzalloc(sizeof(struct tegra_ehci_hcd), GFP_KERNEL);
if (!tegra)
return -ENOMEM;
@ -640,6 +683,28 @@ static int tegra_ehci_probe(struct platform_device *pdev)
goto fail_io;
}
/* This is pretty ugly and needs to be fixed when we do only
* device-tree probing. Old code relies on the platform_device
* numbering that we lack for device-tree-instantiated devices.
*/
if (instance < 0) {
switch (res->start) {
case TEGRA_USB_BASE:
instance = 0;
break;
case TEGRA_USB2_BASE:
instance = 1;
break;
case TEGRA_USB3_BASE:
instance = 2;
break;
default:
err = -ENODEV;
dev_err(&pdev->dev, "unknown usb instance\n");
goto fail_phy;
}
}
tegra->phy = tegra_usb_phy_open(instance, hcd->regs, pdata->phy_config,
TEGRA_USB_PHY_MODE_HOST);
if (IS_ERR(tegra->phy)) {
@ -773,6 +838,11 @@ static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
hcd->driver->shutdown(hcd);
}
static struct of_device_id tegra_ehci_of_match[] __devinitdata = {
{ .compatible = "nvidia,tegra20-ehci", },
{ },
};
static struct platform_driver tegra_ehci_driver = {
.probe = tegra_ehci_probe,
.remove = tegra_ehci_remove,
@ -783,5 +853,6 @@ static struct platform_driver tegra_ehci_driver = {
.shutdown = tegra_ehci_hcd_shutdown,
.driver = {
.name = "tegra-ehci",
.of_match_table = tegra_ehci_of_match,
}
};