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>
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Jean-Christophe PLAGNIOL-VILLARD
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82015c4eae
commit
2419730f8f
2 changed files with 119 additions and 1 deletions
19
Documentation/devicetree/bindings/usb/atmel-usb.txt
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19
Documentation/devicetree/bindings/usb/atmel-usb.txt
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@ -0,0 +1,19 @@
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Atmel SOC USB controllers
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OHCI
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Required properties:
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- compatible: Should be "atmel,at91rm9200-ohci" for USB controllers
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used in host mode.
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- num-ports: Number of ports.
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- atmel,vbus-gpio: If present, specifies a gpio that needs to be
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activated for the bus to be powered.
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- atmel,oc-gpio: If present, specifies a gpio that needs to be
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activated for the overcurrent detection.
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usb0: ohci@00500000 {
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compatible = "atmel,at91rm9200-ohci", "usb-ohci";
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reg = <0x00500000 0x100000>;
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interrupts = <20 4>;
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num-ports = <2>;
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};
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@ -14,6 +14,8 @@
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <mach/hardware.h>
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#include <asm/gpio.h>
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@ -477,13 +479,109 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id at91_ohci_dt_ids[] = {
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{ .compatible = "atmel,at91rm9200-ohci" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
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static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
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static int __devinit ohci_at91_of_init(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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int i, ret, gpio;
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enum of_gpio_flags flags;
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struct at91_usbh_data *pdata;
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u32 ports;
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if (!np)
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return 0;
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/* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we have dma capability bindings this can go away.
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*/
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if (!pdev->dev.dma_mask)
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pdev->dev.dma_mask = &at91_ohci_dma_mask;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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if (!of_property_read_u32(np, "num-ports", &ports))
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pdata->ports = ports;
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for (i = 0; i < 2; i++) {
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gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
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pdata->vbus_pin[i] = gpio;
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if (!gpio_is_valid(gpio))
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continue;
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pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
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ret = gpio_request(gpio, "ohci_vbus");
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if (ret) {
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dev_warn(&pdev->dev, "can't request vbus gpio %d", gpio);
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continue;
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}
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ret = gpio_direction_output(gpio, !(flags & OF_GPIO_ACTIVE_LOW) ^ 1);
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if (ret)
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dev_warn(&pdev->dev, "can't put vbus gpio %d as output %d",
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!(flags & OF_GPIO_ACTIVE_LOW) ^ 1, gpio);
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}
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for (i = 0; i < 2; i++) {
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gpio = of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
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pdata->overcurrent_pin[i] = gpio;
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if (!gpio_is_valid(gpio))
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continue;
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ret = gpio_request(gpio, "ohci_overcurrent");
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if (ret) {
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dev_err(&pdev->dev, "can't request overcurrent gpio %d", gpio);
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continue;
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}
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ret = gpio_direction_input(gpio);
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if (ret) {
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dev_err(&pdev->dev, "can't configure overcurrent gpio %d as input", gpio);
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continue;
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}
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ret = request_irq(gpio_to_irq(gpio),
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ohci_hcd_at91_overcurrent_irq,
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IRQF_SHARED, "ohci_overcurrent", pdev);
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if (ret) {
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gpio_free(gpio);
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dev_warn(& pdev->dev, "cannot get GPIO IRQ for overcurrent\n");
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}
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}
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pdev->dev.platform_data = pdata;
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return 0;
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}
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#else
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static int __devinit ohci_at91_of_init(struct platform_device *pdev)
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{
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return 0;
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}
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#endif
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/*-------------------------------------------------------------------------*/
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static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
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{
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struct at91_usbh_data *pdata = pdev->dev.platform_data;
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struct at91_usbh_data *pdata;
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int i;
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i = ohci_at91_of_init(pdev);
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if (i)
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return i;
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pdata = pdev->dev.platform_data;
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if (pdata) {
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for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
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if (!gpio_is_valid(pdata->vbus_pin[i]))
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@ -596,5 +694,6 @@ static struct platform_driver ohci_hcd_at91_driver = {
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.driver = {
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.name = "at91_ohci",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(at91_ohci_dt_ids),
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},
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};
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