[linux-2.6-block.git] / drivers / spi / spi-dw-mmio.c

/*
 * Memory-mapped interface driver for DW SPI Core
 *
 * Copyright (c) 2010, Octasic semiconductor.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/scatterlist.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>

#include "spi-dw.h"

#define DRIVER_NAME "dw_spi_mmio"

struct dw_spi_mmio {
	struct dw_spi  dws;
	struct clk     *clk;
};

static int dw_spi_mmio_probe(struct platform_device *pdev)
{
	struct dw_spi_mmio *dwsmmio;
	struct dw_spi *dws;
	struct resource *mem;
	int ret;
	int num_cs;

	dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
			GFP_KERNEL);
	if (!dwsmmio)
		return -ENOMEM;

	dws = &dwsmmio->dws;

	/* Get basic io resource and map it */
	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "no mem resource?\n");
		return -EINVAL;
	}

	dws->regs = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(dws->regs)) {
		dev_err(&pdev->dev, "SPI region map failed\n");
		return PTR_ERR(dws->regs);
	}

	dws->irq = platform_get_irq(pdev, 0);
	if (dws->irq < 0) {
		dev_err(&pdev->dev, "no irq resource?\n");
		return dws->irq; /* -ENXIO */
	}

	dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(dwsmmio->clk))
		return PTR_ERR(dwsmmio->clk);
	ret = clk_prepare_enable(dwsmmio->clk);
	if (ret)
		return ret;

	dws->bus_num = pdev->id;

	dws->max_freq = clk_get_rate(dwsmmio->clk);

	of_property_read_u32(pdev->dev.of_node, "reg-io-width",
			     &dws->reg_io_width);

	num_cs = 4;

	if (pdev->dev.of_node)
		of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);

	dws->num_cs = num_cs;

	if (pdev->dev.of_node) {
		int i;

		for (i = 0; i < dws->num_cs; i++) {
			int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
					"cs-gpios", i);

			if (cs_gpio == -EPROBE_DEFER) {
				ret = cs_gpio;
				goto out;
			}

			if (gpio_is_valid(cs_gpio)) {
				ret = devm_gpio_request(&pdev->dev, cs_gpio,
						dev_name(&pdev->dev));
				if (ret)
					goto out;
			}
		}
	}

	ret = dw_spi_add_host(&pdev->dev, dws);
	if (ret)
		goto out;

	platform_set_drvdata(pdev, dwsmmio);
	return 0;

out:
	clk_disable_unprepare(dwsmmio->clk);
	return ret;
}

static int dw_spi_mmio_remove(struct platform_device *pdev)
{
	struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);

	clk_disable_unprepare(dwsmmio->clk);
	dw_spi_remove_host(&dwsmmio->dws);

	return 0;
}

static const struct of_device_id dw_spi_mmio_of_match[] = {
	{ .compatible = "snps,dw-apb-ssi", },
	{ /* end of table */}
};
MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);

static struct platform_driver dw_spi_mmio_driver = {
	.probe		= dw_spi_mmio_probe,
	.remove		= dw_spi_mmio_remove,
	.driver		= {
		.name	= DRIVER_NAME,
		.of_match_table = dw_spi_mmio_of_match,
	},
};
module_platform_driver(dw_spi_mmio_driver);

MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f7b6fd6d	1	/*
ca632f55	2	* Memory-mapped interface driver for DW SPI Core
f7b6fd6d JHD	3	*
	4	* Copyright (c) 2010, Octasic semiconductor.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/clk.h>
50c01fc3	12	#include <linux/err.h>
f7b6fd6d JHD	13	#include <linux/interrupt.h>
f7b6fd6d JHD	14	#include <linux/platform_device.h>
5a0e3ad6	15	#include <linux/slab.h>
f7b6fd6d	16	#include <linux/spi/spi.h>
568a60ed	17	#include <linux/scatterlist.h>
d7614de4	18	#include <linux/module.h>
22dae17e	19	#include <linux/of.h>
d9c73bb8	20	#include <linux/of_gpio.h>
22dae17e	21	#include <linux/of_platform.h>
568a60ed	22
ca632f55	23	#include "spi-dw.h"
f7b6fd6d JHD	24
	25	#define DRIVER_NAME "dw_spi_mmio"
	26
	27	struct dw_spi_mmio {
0a4c1d7d JHD	28	struct dw_spi dws;
0a4c1d7d JHD	29	struct clk *clk;
f7b6fd6d JHD	30	};
f7b6fd6d JHD	31
fd4a319b	32	static int dw_spi_mmio_probe(struct platform_device *pdev)
f7b6fd6d JHD	33	{
	34	struct dw_spi_mmio *dwsmmio;
	35	struct dw_spi *dws;
04f421e7	36	struct resource *mem;
f7b6fd6d	37	int ret;
22dae17e	38	int num_cs;
f7b6fd6d	39
04f421e7 BS	40	dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
	41	GFP_KERNEL);
	42	if (!dwsmmio)
	43	return -ENOMEM;
f7b6fd6d JHD	44
	45	dws = &dwsmmio->dws;
	46
	47	/* Get basic io resource and map it */
	48	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	49	if (!mem) {
	50	dev_err(&pdev->dev, "no mem resource?\n");
04f421e7	51	return -EINVAL;
f7b6fd6d JHD	52	}
f7b6fd6d JHD	53
04f421e7 BS	54	dws->regs = devm_ioremap_resource(&pdev->dev, mem);
	55	if (IS_ERR(dws->regs)) {
	56	dev_err(&pdev->dev, "SPI region map failed\n");
	57	return PTR_ERR(dws->regs);
f7b6fd6d JHD	58	}
	59
	60	dws->irq = platform_get_irq(pdev, 0);
	61	if (dws->irq < 0) {
	62	dev_err(&pdev->dev, "no irq resource?\n");
04f421e7	63	return dws->irq; /* -ENXIO */
f7b6fd6d JHD	64	}
f7b6fd6d JHD	65
04f421e7 BS	66	dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
	67	if (IS_ERR(dwsmmio->clk))
	68	return PTR_ERR(dwsmmio->clk);
020fe3fe	69	ret = clk_prepare_enable(dwsmmio->clk);
04f421e7 BS	70	if (ret)
04f421e7 BS	71	return ret;
f7b6fd6d	72
2418991e	73	dws->bus_num = pdev->id;
22dae17e	74
f7b6fd6d JHD	75	dws->max_freq = clk_get_rate(dwsmmio->clk);
f7b6fd6d JHD	76
c4fe57f7 MW	77	of_property_read_u32(pdev->dev.of_node, "reg-io-width",
	78	&dws->reg_io_width);
	79
22dae17e ST	80	num_cs = 4;
	81
	82	if (pdev->dev.of_node)
	83	of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
	84
	85	dws->num_cs = num_cs;
	86
d9c73bb8 BS	87	if (pdev->dev.of_node) {
	88	int i;
	89
	90	for (i = 0; i < dws->num_cs; i++) {
	91	int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
	92	"cs-gpios", i);
	93
	94	if (cs_gpio == -EPROBE_DEFER) {
	95	ret = cs_gpio;
	96	goto out;
	97	}
	98
	99	if (gpio_is_valid(cs_gpio)) {
	100	ret = devm_gpio_request(&pdev->dev, cs_gpio,
	101	dev_name(&pdev->dev));
	102	if (ret)
	103	goto out;
	104	}
	105	}
	106	}
	107
04f421e7	108	ret = dw_spi_add_host(&pdev->dev, dws);
f7b6fd6d	109	if (ret)
04f421e7	110	goto out;
f7b6fd6d JHD	111
	112	platform_set_drvdata(pdev, dwsmmio);
	113	return 0;
	114
04f421e7	115	out:
020fe3fe	116	clk_disable_unprepare(dwsmmio->clk);
f7b6fd6d JHD	117	return ret;
	118	}
	119
fd4a319b	120	static int dw_spi_mmio_remove(struct platform_device *pdev)
f7b6fd6d JHD	121	{
f7b6fd6d JHD	122	struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
f7b6fd6d	123
020fe3fe	124	clk_disable_unprepare(dwsmmio->clk);
f7b6fd6d	125	dw_spi_remove_host(&dwsmmio->dws);
f7b6fd6d	126
f7b6fd6d JHD	127	return 0;
	128	}
	129
22dae17e ST	130	static const struct of_device_id dw_spi_mmio_of_match[] = {
	131	{ .compatible = "snps,dw-apb-ssi", },
	132	{ /* end of table */}
	133	};
	134	MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
	135
f7b6fd6d	136	static struct platform_driver dw_spi_mmio_driver = {
940ab889	137	.probe = dw_spi_mmio_probe,
fd4a319b	138	.remove = dw_spi_mmio_remove,
f7b6fd6d JHD	139	.driver = {
f7b6fd6d JHD	140	.name = DRIVER_NAME,
22dae17e	141	.of_match_table = dw_spi_mmio_of_match,
f7b6fd6d JHD	142	},
f7b6fd6d JHD	143	};
940ab889	144	module_platform_driver(dw_spi_mmio_driver);
f7b6fd6d JHD	145
	146	MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
	147	MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
	148	MODULE_LICENSE("GPL v2");