[mirror_ubuntu-artful-kernel.git] / drivers / usb / dwc3 / dwc3-keystone.c

/**
 * dwc3-keystone.c - Keystone Specific Glue layer
 *
 * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
 *
 * Author: WingMan Kwok <w-kwok2@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
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/of_platform.h>

/* USBSS register offsets */
#define USBSS_REVISION		0x0000
#define USBSS_SYSCONFIG		0x0010
#define USBSS_IRQ_EOI		0x0018
#define USBSS_IRQSTATUS_RAW_0	0x0020
#define USBSS_IRQSTATUS_0	0x0024
#define USBSS_IRQENABLE_SET_0	0x0028
#define USBSS_IRQENABLE_CLR_0	0x002c

/* IRQ register bits */
#define USBSS_IRQ_EOI_LINE(n)	BIT(n)
#define USBSS_IRQ_EVENT_ST	BIT(0)
#define USBSS_IRQ_COREIRQ_EN	BIT(0)
#define USBSS_IRQ_COREIRQ_CLR	BIT(0)

struct dwc3_keystone {
	struct device			*dev;
	struct clk			*clk;
	void __iomem			*usbss;
};

static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
{
	return readl(base + offset);
}

static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
{
	writel(value, base + offset);
}

static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
{
	u32 val;

	val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
	val |= USBSS_IRQ_COREIRQ_EN;
	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
}

static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
{
	u32 val;

	val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
	val &= ~USBSS_IRQ_COREIRQ_EN;
	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
}

static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
{
	struct dwc3_keystone	*kdwc = _kdwc;

	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
	kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
	kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));

	return IRQ_HANDLED;
}

static int kdwc3_probe(struct platform_device *pdev)
{
	struct device		*dev = &pdev->dev;
	struct device_node	*node = pdev->dev.of_node;
	struct dwc3_keystone	*kdwc;
	struct resource		*res;
	int			error, irq;

	kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
	if (!kdwc)
		return -ENOMEM;

	platform_set_drvdata(pdev, kdwc);

	kdwc->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	kdwc->usbss = devm_ioremap_resource(dev, res);
	if (IS_ERR(kdwc->usbss))
		return PTR_ERR(kdwc->usbss);

	kdwc->clk = devm_clk_get(kdwc->dev, "usb");
	if (IS_ERR(kdwc->clk)) {
		dev_err(kdwc->dev, "unable to get usb clock\n");
		return PTR_ERR(kdwc->clk);
	}

	error = clk_prepare_enable(kdwc->clk);
	if (error < 0) {
		dev_err(kdwc->dev, "unable to enable usb clock, error %d\n",
			error);
		return error;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "missing irq\n");
		error = irq;
		goto err_irq;
	}

	error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
			dev_name(dev), kdwc);
	if (error) {
		dev_err(dev, "failed to request IRQ #%d --> %d\n",
				irq, error);
		goto err_irq;
	}

	kdwc3_enable_irqs(kdwc);

	error = of_platform_populate(node, NULL, NULL, dev);
	if (error) {
		dev_err(&pdev->dev, "failed to create dwc3 core\n");
		goto err_core;
	}

	return 0;

err_core:
	kdwc3_disable_irqs(kdwc);
err_irq:
	clk_disable_unprepare(kdwc->clk);

	return error;
}

static int kdwc3_remove_core(struct device *dev, void *c)
{
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);

	return 0;
}

static int kdwc3_remove(struct platform_device *pdev)
{
	struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);

	kdwc3_disable_irqs(kdwc);
	device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
	clk_disable_unprepare(kdwc->clk);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static const struct of_device_id kdwc3_of_match[] = {
	{ .compatible = "ti,keystone-dwc3", },
	{},
};
MODULE_DEVICE_TABLE(of, kdwc3_of_match);

static struct platform_driver kdwc3_driver = {
	.probe		= kdwc3_probe,
	.remove		= kdwc3_remove,
	.driver		= {
		.name	= "keystone-dwc3",
		.of_match_table	= kdwc3_of_match,
	},
};

module_platform_driver(kdwc3_driver);

MODULE_ALIAS("platform:keystone-dwc3");
MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
Commit	Line	Data
943befc3 WK	1	/**
	2	* dwc3-keystone.c - Keystone Specific Glue layer
	3	*
	4	* Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
	5	*
	6	* Author: WingMan Kwok <w-kwok2@ti.com>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 of
	10	* the License as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/clk.h>
	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/dma-mapping.h>
	24	#include <linux/io.h>
	25	#include <linux/of_platform.h>
	26
	27	/* USBSS register offsets */
	28	#define USBSS_REVISION 0x0000
	29	#define USBSS_SYSCONFIG 0x0010
	30	#define USBSS_IRQ_EOI 0x0018
	31	#define USBSS_IRQSTATUS_RAW_0 0x0020
	32	#define USBSS_IRQSTATUS_0 0x0024
	33	#define USBSS_IRQENABLE_SET_0 0x0028
	34	#define USBSS_IRQENABLE_CLR_0 0x002c
	35
	36	/* IRQ register bits */
	37	#define USBSS_IRQ_EOI_LINE(n) BIT(n)
	38	#define USBSS_IRQ_EVENT_ST BIT(0)
	39	#define USBSS_IRQ_COREIRQ_EN BIT(0)
	40	#define USBSS_IRQ_COREIRQ_CLR BIT(0)
	41
943befc3 WK	42	struct dwc3_keystone {
	43	struct device *dev;
	44	struct clk *clk;
	45	void __iomem *usbss;
	46	};
	47
	48	static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
	49	{
	50	return readl(base + offset);
	51	}
	52
	53	static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
	54	{
	55	writel(value, base + offset);
	56	}
	57
	58	static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
	59	{
	60	u32 val;
	61
	62	val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
	63	val \|= USBSS_IRQ_COREIRQ_EN;
	64	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
	65	}
	66
	67	static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
	68	{
	69	u32 val;
	70
	71	val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
	72	val &= ~USBSS_IRQ_COREIRQ_EN;
	73	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
	74	}
	75
	76	static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
	77	{
	78	struct dwc3_keystone *kdwc = _kdwc;
	79
	80	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
	81	kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
	82	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
	83	kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
	84
	85	return IRQ_HANDLED;
	86	}
	87
	88	static int kdwc3_probe(struct platform_device *pdev)
	89	{
	90	struct device *dev = &pdev->dev;
	91	struct device_node *node = pdev->dev.of_node;
	92	struct dwc3_keystone *kdwc;
	93	struct resource *res;
	94	int error, irq;
	95
	96	kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
	97	if (!kdwc)
	98	return -ENOMEM;
	99
	100	platform_set_drvdata(pdev, kdwc);
	101
	102	kdwc->dev = dev;
	103
	104	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
943befc3 WK	105	kdwc->usbss = devm_ioremap_resource(dev, res);
	106	if (IS_ERR(kdwc->usbss))
	107	return PTR_ERR(kdwc->usbss);
	108
943befc3	109	kdwc->clk = devm_clk_get(kdwc->dev, "usb");
018047a1 PB	110	if (IS_ERR(kdwc->clk)) {
	111	dev_err(kdwc->dev, "unable to get usb clock\n");
	112	return PTR_ERR(kdwc->clk);
	113	}
943befc3 WK	114
	115	error = clk_prepare_enable(kdwc->clk);
	116	if (error < 0) {
9ff0fdca	117	dev_err(kdwc->dev, "unable to enable usb clock, error %d\n",
943befc3 WK	118	error);
	119	return error;
	120	}
	121
	122	irq = platform_get_irq(pdev, 0);
	123	if (irq < 0) {
	124	dev_err(&pdev->dev, "missing irq\n");
62c60697	125	error = irq;
943befc3 WK	126	goto err_irq;
	127	}
	128
	129	error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
	130	dev_name(dev), kdwc);
	131	if (error) {
	132	dev_err(dev, "failed to request IRQ #%d --> %d\n",
	133	irq, error);
	134	goto err_irq;
	135	}
	136
	137	kdwc3_enable_irqs(kdwc);
	138
	139	error = of_platform_populate(node, NULL, NULL, dev);
	140	if (error) {
	141	dev_err(&pdev->dev, "failed to create dwc3 core\n");
	142	goto err_core;
	143	}
	144
	145	return 0;
	146
	147	err_core:
	148	kdwc3_disable_irqs(kdwc);
	149	err_irq:
	150	clk_disable_unprepare(kdwc->clk);
	151
	152	return error;
	153	}
	154
	155	static int kdwc3_remove_core(struct device dev, void c)
	156	{
	157	struct platform_device *pdev = to_platform_device(dev);
	158
	159	platform_device_unregister(pdev);
	160
	161	return 0;
	162	}
	163
	164	static int kdwc3_remove(struct platform_device *pdev)
	165	{
	166	struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
	167
	168	kdwc3_disable_irqs(kdwc);
	169	device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
	170	clk_disable_unprepare(kdwc->clk);
	171	platform_set_drvdata(pdev, NULL);
	172
	173	return 0;
	174	}
	175
	176	static const struct of_device_id kdwc3_of_match[] = {
	177	{ .compatible = "ti,keystone-dwc3", },
	178	{},
	179	};
	180	MODULE_DEVICE_TABLE(of, kdwc3_of_match);
	181
	182	static struct platform_driver kdwc3_driver = {
	183	.probe = kdwc3_probe,
	184	.remove = kdwc3_remove,
	185	.driver = {
	186	.name = "keystone-dwc3",
943befc3 WK	187	.of_match_table = kdwc3_of_match,
	188	},
	189	};
	190
	191	module_platform_driver(kdwc3_driver);
	192
	193	MODULE_ALIAS("platform:keystone-dwc3");
	194	MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
	195	MODULE_LICENSE("GPL v2");
	196	MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");