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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2011, 2012 Cavium, Inc.
*/
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <asm/octeon/octeon.h>
#include "spi-cavium.h"
static int octeon_spi_probe(struct platform_device *pdev)
{
void __iomem *reg_base;
struct spi_controller *host;
struct octeon_spi *p;
int err = -ENOENT;
host = spi_alloc_host(&pdev->dev, sizeof(struct octeon_spi));
if (!host)
return -ENOMEM;
p = spi_controller_get_devdata(host);
platform_set_drvdata(pdev, host);
reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(reg_base)) {
err = PTR_ERR(reg_base);
goto fail;
}
p->register_base = reg_base;
p->sys_freq = octeon_get_io_clock_rate();
p->regs.config = 0;
p->regs.status = 0x08;
p->regs.tx = 0x10;
p->regs.data = 0x80;
host->num_chipselect = 4;
host->mode_bits = SPI_CPHA |
SPI_CPOL |
SPI_CS_HIGH |
SPI_LSB_FIRST |
SPI_3WIRE;
host->transfer_one_message = octeon_spi_transfer_one_message;
host->bits_per_word_mask = SPI_BPW_MASK(8);
host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
host->dev.of_node = pdev->dev.of_node;
err = devm_spi_register_controller(&pdev->dev, host);
if (err) {
dev_err(&pdev->dev, "register host failed: %d\n", err);
goto fail;
}
dev_info(&pdev->dev, "OCTEON SPI bus driver\n");
return 0;
fail:
spi_controller_put(host);
return err;
}
static void octeon_spi_remove(struct platform_device *pdev)
{
struct spi_controller *host = platform_get_drvdata(pdev);
struct octeon_spi *p = spi_controller_get_devdata(host);
/* Clear the CSENA* and put everything in a known state. */
writeq(0, p->register_base + OCTEON_SPI_CFG(p));
}
static const struct of_device_id octeon_spi_match[] = {
{ .compatible = "cavium,octeon-3010-spi", },
{},
};
MODULE_DEVICE_TABLE(of, octeon_spi_match);
static struct platform_driver octeon_spi_driver = {
.driver = {
.name = "spi-octeon",
.of_match_table = octeon_spi_match,
},
.probe = octeon_spi_probe,
.remove_new = octeon_spi_remove,
};
module_platform_driver(octeon_spi_driver);
MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver");
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");
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