[deliverable/linux.git] / drivers / usb / musb / jz4740.c

/*
 * Ingenic JZ4740 "glue layer"
 *
 * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/usb_phy_generic.h>

#include "musb_core.h"

struct jz4740_glue {
	struct device           *dev;
	struct platform_device  *musb;
	struct clk		*clk;
};

static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
{
	unsigned long   flags;
	irqreturn_t     retval = IRQ_NONE;
	struct musb     *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);

	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

	/*
	 * The controller is gadget only, the state of the host mode IRQ bits is
	 * undefined. Mask them to make sure that the musb driver core will
	 * never see them set
	 */
	musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
	    MUSB_INTR_RESET | MUSB_INTR_SOF;

	if (musb->int_usb || musb->int_tx || musb->int_rx)
		retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
}

static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
};

static struct musb_hdrc_config jz4740_musb_config = {
	/* Silicon does not implement USB OTG. */
	.multipoint = 0,
	/* Max EPs scanned, driver will decide which EP can be used. */
	.num_eps    = 4,
	/* RAMbits needed to configure EPs from table */
	.ram_bits   = 9,
	.fifo_cfg = jz4740_musb_fifo_cfg,
	.fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
};

static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
	.mode   = MUSB_PERIPHERAL,
	.config = &jz4740_musb_config,
};

static int jz4740_musb_init(struct musb *musb)
{
	usb_phy_generic_register();
	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
	if (IS_ERR(musb->xceiv)) {
		pr_err("HS UDC: no transceiver configured\n");
		return PTR_ERR(musb->xceiv);
	}

	/* Silicon does not implement ConfigData register.
	 * Set dyn_fifo to avoid reading EP config from hardware.
	 */
	musb->dyn_fifo = true;

	musb->isr = jz4740_musb_interrupt;

	return 0;
}

static int jz4740_musb_exit(struct musb *musb)
{
	usb_put_phy(musb->xceiv);

	return 0;
}

/*
 * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
 * so let's not set up the dma function pointers yet.
 */
static const struct musb_platform_ops jz4740_musb_ops = {
	.quirks		= MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
	.fifo_mode	= 2,
	.init		= jz4740_musb_init,
	.exit		= jz4740_musb_exit,
};

static int jz4740_probe(struct platform_device *pdev)
{
	struct musb_hdrc_platform_data	*pdata = &jz4740_musb_platform_data;
	struct platform_device		*musb;
	struct jz4740_glue		*glue;
	struct clk                      *clk;
	int				ret;

	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
	if (!glue)
		return -ENOMEM;

	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
	if (!musb) {
		dev_err(&pdev->dev, "failed to allocate musb device\n");
		return -ENOMEM;
	}

	clk = devm_clk_get(&pdev->dev, "udc");
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		ret = PTR_ERR(clk);
		goto err_platform_device_put;
	}

	ret = clk_prepare_enable(clk);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable clock\n");
		goto err_platform_device_put;
	}

	musb->dev.parent		= &pdev->dev;

	glue->dev			= &pdev->dev;
	glue->musb			= musb;
	glue->clk			= clk;

	pdata->platform_ops		= &jz4740_musb_ops;

	platform_set_drvdata(pdev, glue);

	ret = platform_device_add_resources(musb, pdev->resource,
					    pdev->num_resources);
	if (ret) {
		dev_err(&pdev->dev, "failed to add resources\n");
		goto err_clk_disable;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(&pdev->dev, "failed to add platform_data\n");
		goto err_clk_disable;
	}

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(&pdev->dev, "failed to register musb device\n");
		goto err_clk_disable;
	}

	return 0;

err_clk_disable:
	clk_disable_unprepare(clk);
err_platform_device_put:
	platform_device_put(musb);
	return ret;
}

static int jz4740_remove(struct platform_device *pdev)
{
	struct jz4740_glue	*glue = platform_get_drvdata(pdev);

	platform_device_unregister(glue->musb);
	usb_phy_generic_unregister(pdev);
	clk_disable_unprepare(glue->clk);

	return 0;
}

static struct platform_driver jz4740_driver = {
	.probe		= jz4740_probe,
	.remove		= jz4740_remove,
	.driver		= {
		.name	= "musb-jz4740",
	},
};

MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
MODULE_LICENSE("GPL v2");
module_platform_driver(jz4740_driver);
Commit	Line	Data
10434d27 AS	1	/*
	2	* Ingenic JZ4740 "glue layer"
	3	*
	4	* Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* You should have received a copy of the GNU General Public License along
	12	* with this program; if not, write to the Free Software Foundation, Inc.,
	13	* 675 Mass Ave, Cambridge, MA 02139, USA.
	14	*/
	15
	16	#include <linux/clk.h>
	17	#include <linux/dma-mapping.h>
	18	#include <linux/errno.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/platform_device.h>
3d75bd3d	22	#include <linux/usb/usb_phy_generic.h>
10434d27 AS	23
	24	#include "musb_core.h"
	25
	26	struct jz4740_glue {
	27	struct device *dev;
	28	struct platform_device *musb;
	29	struct clk *clk;
	30	};
	31
	32	static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
	33	{
	34	unsigned long flags;
	35	irqreturn_t retval = IRQ_NONE;
	36	struct musb *musb = __hci;
	37
	38	spin_lock_irqsave(&musb->lock, flags);
	39
	40	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	41	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	42	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
	43
	44	/*
	45	* The controller is gadget only, the state of the host mode IRQ bits is
	46	* undefined. Mask them to make sure that the musb driver core will
	47	* never see them set
	48	*/
	49	musb->int_usb &= MUSB_INTR_SUSPEND \| MUSB_INTR_RESUME \|
	50	MUSB_INTR_RESET \| MUSB_INTR_SOF;
	51
	52	if (musb->int_usb \|\| musb->int_tx \|\| musb->int_rx)
	53	retval = musb_interrupt(musb);
	54
	55	spin_unlock_irqrestore(&musb->lock, flags);
	56
	57	return retval;
	58	}
	59
	60	static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
	61	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
	62	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
	63	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
	64	};
	65
	66	static struct musb_hdrc_config jz4740_musb_config = {
	67	/* Silicon does not implement USB OTG. */
	68	.multipoint = 0,
	69	/* Max EPs scanned, driver will decide which EP can be used. */
	70	.num_eps = 4,
	71	/* RAMbits needed to configure EPs from table */
	72	.ram_bits = 9,
	73	.fifo_cfg = jz4740_musb_fifo_cfg,
	74	.fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
	75	};
	76
	77	static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
	78	.mode = MUSB_PERIPHERAL,
	79	.config = &jz4740_musb_config,
	80	};
	81
	82	static int jz4740_musb_init(struct musb *musb)
	83	{
3d75bd3d	84	usb_phy_generic_register();
10434d27	85	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
97b9b7dc	86	if (IS_ERR(musb->xceiv)) {
10434d27	87	pr_err("HS UDC: no transceiver configured\n");
97b9b7dc	88	return PTR_ERR(musb->xceiv);
10434d27 AS	89	}
	90
	91	/* Silicon does not implement ConfigData register.
	92	* Set dyn_fifo to avoid reading EP config from hardware.
	93	*/
	94	musb->dyn_fifo = true;
	95
	96	musb->isr = jz4740_musb_interrupt;
	97
	98	return 0;
	99	}
	100
	101	static int jz4740_musb_exit(struct musb *musb)
	102	{
	103	usb_put_phy(musb->xceiv);
	104
	105	return 0;
	106	}
	107
7f6283ed TL	108	/*
	109	* DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
	110	* so let's not set up the dma function pointers yet.
	111	*/
10434d27	112	static const struct musb_platform_ops jz4740_musb_ops = {
f8e9f34f	113	.quirks = MUSB_DMA_INVENTRA \| MUSB_INDEXED_EP,
8a77f05a	114	.fifo_mode = 2,
10434d27 AS	115	.init = jz4740_musb_init,
	116	.exit = jz4740_musb_exit,
	117	};
	118
	119	static int jz4740_probe(struct platform_device *pdev)
	120	{
	121	struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
	122	struct platform_device *musb;
	123	struct jz4740_glue *glue;
	124	struct clk *clk;
	125	int ret;
	126
	127	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
	128	if (!glue)
	129	return -ENOMEM;
	130
	131	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
	132	if (!musb) {
	133	dev_err(&pdev->dev, "failed to allocate musb device\n");
	134	return -ENOMEM;
	135	}
	136
	137	clk = devm_clk_get(&pdev->dev, "udc");
	138	if (IS_ERR(clk)) {
	139	dev_err(&pdev->dev, "failed to get clock\n");
	140	ret = PTR_ERR(clk);
	141	goto err_platform_device_put;
	142	}
	143
	144	ret = clk_prepare_enable(clk);
	145	if (ret) {
	146	dev_err(&pdev->dev, "failed to enable clock\n");
	147	goto err_platform_device_put;
	148	}
	149
	150	musb->dev.parent = &pdev->dev;
	151
	152	glue->dev = &pdev->dev;
	153	glue->musb = musb;
	154	glue->clk = clk;
	155
	156	pdata->platform_ops = &jz4740_musb_ops;
	157
	158	platform_set_drvdata(pdev, glue);
	159
	160	ret = platform_device_add_resources(musb, pdev->resource,
	161	pdev->num_resources);
	162	if (ret) {
	163	dev_err(&pdev->dev, "failed to add resources\n");
	164	goto err_clk_disable;
	165	}
	166
	167	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	168	if (ret) {
	169	dev_err(&pdev->dev, "failed to add platform_data\n");
	170	goto err_clk_disable;
	171	}
	172
	173	ret = platform_device_add(musb);
	174	if (ret) {
	175	dev_err(&pdev->dev, "failed to register musb device\n");
	176	goto err_clk_disable;
	177	}
	178
179	return 0;
180
181	err_clk_disable:
182	clk_disable_unprepare(clk);
183	err_platform_device_put:
184	platform_device_put(musb);
185	return ret;
186	}
187
188	static int jz4740_remove(struct platform_device *pdev)
189	{
190	struct jz4740_glue *glue = platform_get_drvdata(pdev);
191
192	platform_device_unregister(glue->musb);
3d75bd3d	193	usb_phy_generic_unregister(pdev);
10434d27 AS	194	clk_disable_unprepare(glue->clk);
	195
	196	return 0;
	197	}
	198
	199	static struct platform_driver jz4740_driver = {
	200	.probe = jz4740_probe,
	201	.remove = jz4740_remove,
	202	.driver = {
	203	.name = "musb-jz4740",
	204	},
	205	};
	206
	207	MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
	208	MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
	209	MODULE_LICENSE("GPL v2");
	210	module_platform_driver(jz4740_driver);