[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 <linux/property.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);

	device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width);

	num_cs = 4;

	device_property_read_u32(&pdev->dev, "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>
9899995e	22	#include <linux/property.h>
568a60ed	23
ca632f55	24	#include "spi-dw.h"
f7b6fd6d JHD	25
	26	#define DRIVER_NAME "dw_spi_mmio"
	27
	28	struct dw_spi_mmio {
0a4c1d7d JHD	29	struct dw_spi dws;
0a4c1d7d JHD	30	struct clk *clk;
f7b6fd6d JHD	31	};
f7b6fd6d JHD	32
fd4a319b	33	static int dw_spi_mmio_probe(struct platform_device *pdev)
f7b6fd6d JHD	34	{
	35	struct dw_spi_mmio *dwsmmio;
	36	struct dw_spi *dws;
04f421e7	37	struct resource *mem;
f7b6fd6d	38	int ret;
22dae17e	39	int num_cs;
f7b6fd6d	40
04f421e7 BS	41	dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
	42	GFP_KERNEL);
	43	if (!dwsmmio)
	44	return -ENOMEM;
f7b6fd6d JHD	45
	46	dws = &dwsmmio->dws;
	47
	48	/* Get basic io resource and map it */
	49	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	50	if (!mem) {
	51	dev_err(&pdev->dev, "no mem resource?\n");
04f421e7	52	return -EINVAL;
f7b6fd6d JHD	53	}
f7b6fd6d JHD	54
04f421e7 BS	55	dws->regs = devm_ioremap_resource(&pdev->dev, mem);
	56	if (IS_ERR(dws->regs)) {
	57	dev_err(&pdev->dev, "SPI region map failed\n");
	58	return PTR_ERR(dws->regs);
f7b6fd6d JHD	59	}
	60
	61	dws->irq = platform_get_irq(pdev, 0);
	62	if (dws->irq < 0) {
	63	dev_err(&pdev->dev, "no irq resource?\n");
04f421e7	64	return dws->irq; /* -ENXIO */
f7b6fd6d JHD	65	}
f7b6fd6d JHD	66
04f421e7 BS	67	dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
	68	if (IS_ERR(dwsmmio->clk))
	69	return PTR_ERR(dwsmmio->clk);
020fe3fe	70	ret = clk_prepare_enable(dwsmmio->clk);
04f421e7 BS	71	if (ret)
04f421e7 BS	72	return ret;
f7b6fd6d	73
2418991e	74	dws->bus_num = pdev->id;
22dae17e	75
f7b6fd6d JHD	76	dws->max_freq = clk_get_rate(dwsmmio->clk);
f7b6fd6d JHD	77
9899995e	78	device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width);
c4fe57f7	79
22dae17e ST	80	num_cs = 4;
22dae17e ST	81
9899995e	82	device_property_read_u32(&pdev->dev, "num-cs", &num_cs);
22dae17e ST	83
	84	dws->num_cs = num_cs;
	85
d9c73bb8 BS	86	if (pdev->dev.of_node) {
	87	int i;
	88
	89	for (i = 0; i < dws->num_cs; i++) {
	90	int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
	91	"cs-gpios", i);
	92
	93	if (cs_gpio == -EPROBE_DEFER) {
	94	ret = cs_gpio;
	95	goto out;
	96	}
	97
	98	if (gpio_is_valid(cs_gpio)) {
	99	ret = devm_gpio_request(&pdev->dev, cs_gpio,
	100	dev_name(&pdev->dev));
	101	if (ret)
	102	goto out;
	103	}
	104	}
	105	}
	106
04f421e7	107	ret = dw_spi_add_host(&pdev->dev, dws);
f7b6fd6d	108	if (ret)
04f421e7	109	goto out;
f7b6fd6d JHD	110
	111	platform_set_drvdata(pdev, dwsmmio);
	112	return 0;
	113
04f421e7	114	out:
020fe3fe	115	clk_disable_unprepare(dwsmmio->clk);
f7b6fd6d JHD	116	return ret;
	117	}
	118
fd4a319b	119	static int dw_spi_mmio_remove(struct platform_device *pdev)
f7b6fd6d JHD	120	{
f7b6fd6d JHD	121	struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
f7b6fd6d	122
020fe3fe	123	clk_disable_unprepare(dwsmmio->clk);
f7b6fd6d	124	dw_spi_remove_host(&dwsmmio->dws);
f7b6fd6d	125
f7b6fd6d JHD	126	return 0;
	127	}
	128
22dae17e ST	129	static const struct of_device_id dw_spi_mmio_of_match[] = {
	130	{ .compatible = "snps,dw-apb-ssi", },
	131	{ /* end of table */}
	132	};
	133	MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
	134
f7b6fd6d	135	static struct platform_driver dw_spi_mmio_driver = {
940ab889	136	.probe = dw_spi_mmio_probe,
fd4a319b	137	.remove = dw_spi_mmio_remove,
f7b6fd6d JHD	138	.driver = {
f7b6fd6d JHD	139	.name = DRIVER_NAME,
22dae17e	140	.of_match_table = dw_spi_mmio_of_match,
f7b6fd6d JHD	141	},
f7b6fd6d JHD	142	};
940ab889	143	module_platform_driver(dw_spi_mmio_driver);
f7b6fd6d JHD	144
	145	MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
	146	MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
	147	MODULE_LICENSE("GPL v2");