mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-22 17:33:01 +00:00
0a4c1d7d44
Minor code style cleanups following comments by Wolfram Sang Signed-off-by: Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/*
|
|
* dw_spi_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/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/spi/dw_spi.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#define DRIVER_NAME "dw_spi_mmio"
|
|
|
|
struct dw_spi_mmio {
|
|
struct dw_spi dws;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
|
|
{
|
|
struct dw_spi_mmio *dwsmmio;
|
|
struct dw_spi *dws;
|
|
struct resource *mem, *ioarea;
|
|
int ret;
|
|
|
|
dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
|
|
if (!dwsmmio) {
|
|
ret = -ENOMEM;
|
|
goto err_end;
|
|
}
|
|
|
|
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");
|
|
ret = -EINVAL;
|
|
goto err_kfree;
|
|
}
|
|
|
|
ioarea = request_mem_region(mem->start, resource_size(mem),
|
|
pdev->name);
|
|
if (!ioarea) {
|
|
dev_err(&pdev->dev, "SPI region already claimed\n");
|
|
ret = -EBUSY;
|
|
goto err_kfree;
|
|
}
|
|
|
|
dws->regs = ioremap_nocache(mem->start, resource_size(mem));
|
|
if (!dws->regs) {
|
|
dev_err(&pdev->dev, "SPI region already mapped\n");
|
|
ret = -ENOMEM;
|
|
goto err_release_reg;
|
|
}
|
|
|
|
dws->irq = platform_get_irq(pdev, 0);
|
|
if (dws->irq < 0) {
|
|
dev_err(&pdev->dev, "no irq resource?\n");
|
|
ret = dws->irq; /* -ENXIO */
|
|
goto err_unmap;
|
|
}
|
|
|
|
dwsmmio->clk = clk_get(&pdev->dev, NULL);
|
|
if (!dwsmmio->clk) {
|
|
ret = -ENODEV;
|
|
goto err_irq;
|
|
}
|
|
clk_enable(dwsmmio->clk);
|
|
|
|
dws->parent_dev = &pdev->dev;
|
|
dws->bus_num = 0;
|
|
dws->num_cs = 4;
|
|
dws->max_freq = clk_get_rate(dwsmmio->clk);
|
|
|
|
ret = dw_spi_add_host(dws);
|
|
if (ret)
|
|
goto err_clk;
|
|
|
|
platform_set_drvdata(pdev, dwsmmio);
|
|
return 0;
|
|
|
|
err_clk:
|
|
clk_disable(dwsmmio->clk);
|
|
clk_put(dwsmmio->clk);
|
|
dwsmmio->clk = NULL;
|
|
err_irq:
|
|
free_irq(dws->irq, dws);
|
|
err_unmap:
|
|
iounmap(dws->regs);
|
|
err_release_reg:
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
err_kfree:
|
|
kfree(dwsmmio);
|
|
err_end:
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
|
|
{
|
|
struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
|
|
struct resource *mem;
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
clk_disable(dwsmmio->clk);
|
|
clk_put(dwsmmio->clk);
|
|
dwsmmio->clk = NULL;
|
|
|
|
free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
|
|
dw_spi_remove_host(&dwsmmio->dws);
|
|
iounmap(dwsmmio->dws.regs);
|
|
kfree(dwsmmio);
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver dw_spi_mmio_driver = {
|
|
.remove = __devexit_p(dw_spi_mmio_remove),
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init dw_spi_mmio_init(void)
|
|
{
|
|
return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
|
|
}
|
|
module_init(dw_spi_mmio_init);
|
|
|
|
static void __exit dw_spi_mmio_exit(void)
|
|
{
|
|
platform_driver_unregister(&dw_spi_mmio_driver);
|
|
}
|
|
module_exit(dw_spi_mmio_exit);
|
|
|
|
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");
|