22dae17e7a
Allow probing the dw-mmio from devicetree. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
147 lines
3.2 KiB
C
147 lines
3.2 KiB
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);
|
|
|
|
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,
|
|
.owner = THIS_MODULE,
|
|
.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");
|