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author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2011-11-21 06:55:18 +0800 |
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committer | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-03-16 00:40:48 +0800 |
commit | 2419730f8f8ce04cce9e39a715c149283210ce27 (patch) | |
tree | 292657322f86363e316feb86e9c6c562aad13d64 /drivers/usb/host/ohci-at91.c | |
parent | 82015c4eae2ac67cfed8e98f8d9a4ee77a2d26ca (diff) | |
download | linux-2419730f8f8ce04cce9e39a715c149283210ce27.tar.gz linux-2419730f8f8ce04cce9e39a715c149283210ce27.tar.bz2 linux-2419730f8f8ce04cce9e39a715c149283210ce27.zip |
ARM: at91: usb ohci add dt support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ohci-at91.c')
-rw-r--r-- | drivers/usb/host/ohci-at91.c | 101 |
1 files changed, 100 insertions, 1 deletions
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index 8e855eb0bf89..db8963f5fbce 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -14,6 +14,8 @@ #include <linux/clk.h> #include <linux/platform_device.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> #include <mach/hardware.h> #include <asm/gpio.h> @@ -477,13 +479,109 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data) return IRQ_HANDLED; } +#ifdef CONFIG_OF +static const struct of_device_id at91_ohci_dt_ids[] = { + { .compatible = "atmel,at91rm9200-ohci" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids); + +static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32); + +static int __devinit ohci_at91_of_init(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + int i, ret, gpio; + enum of_gpio_flags flags; + struct at91_usbh_data *pdata; + u32 ports; + + if (!np) + return 0; + + /* 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 = &at91_ohci_dma_mask; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + if (!of_property_read_u32(np, "num-ports", &ports)) + pdata->ports = ports; + + for (i = 0; i < 2; i++) { + gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags); + pdata->vbus_pin[i] = gpio; + if (!gpio_is_valid(gpio)) + continue; + pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW; + ret = gpio_request(gpio, "ohci_vbus"); + if (ret) { + dev_warn(&pdev->dev, "can't request vbus gpio %d", gpio); + continue; + } + ret = gpio_direction_output(gpio, !(flags & OF_GPIO_ACTIVE_LOW) ^ 1); + if (ret) + dev_warn(&pdev->dev, "can't put vbus gpio %d as output %d", + !(flags & OF_GPIO_ACTIVE_LOW) ^ 1, gpio); + } + + for (i = 0; i < 2; i++) { + gpio = of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags); + pdata->overcurrent_pin[i] = gpio; + if (!gpio_is_valid(gpio)) + continue; + ret = gpio_request(gpio, "ohci_overcurrent"); + if (ret) { + dev_err(&pdev->dev, "can't request overcurrent gpio %d", gpio); + continue; + } + + ret = gpio_direction_input(gpio); + if (ret) { + dev_err(&pdev->dev, "can't configure overcurrent gpio %d as input", gpio); + continue; + } + + ret = request_irq(gpio_to_irq(gpio), + ohci_hcd_at91_overcurrent_irq, + IRQF_SHARED, "ohci_overcurrent", pdev); + if (ret) { + gpio_free(gpio); + dev_warn(& pdev->dev, "cannot get GPIO IRQ for overcurrent\n"); + } + } + + pdev->dev.platform_data = pdata; + + return 0; +} +#else +static int __devinit ohci_at91_of_init(struct platform_device *pdev) +{ + return 0; +} +#endif + /*-------------------------------------------------------------------------*/ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) { - struct at91_usbh_data *pdata = pdev->dev.platform_data; + struct at91_usbh_data *pdata; int i; + i = ohci_at91_of_init(pdev); + + if (i) + return i; + + pdata = pdev->dev.platform_data; + if (pdata) { for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { if (!gpio_is_valid(pdata->vbus_pin[i])) @@ -596,5 +694,6 @@ static struct platform_driver ohci_hcd_at91_driver = { .driver = { .name = "at91_ohci", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(at91_ohci_dt_ids), }, }; |