dev-spi.c

Go to the documentation of this file.

/*
 * 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) 2009-2011 Florian Fainelli <[email protected]>
 * Copyright (C) 2010 Tanguy Bouzeloc <[email protected]>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>

#include <bcm63xx_cpu.h>
#include <bcm63xx_dev_spi.h>
#include <bcm63xx_regs.h>

#ifdef BCMCPU_RUNTIME_DETECT
/*
 * register offsets
 */
static const unsigned long bcm6338_regs_spi[] = {
    __GEN_SPI_REGS_TABLE(6338)
};

static const unsigned long bcm6348_regs_spi[] = {
    __GEN_SPI_REGS_TABLE(6348)
};

static const unsigned long bcm6358_regs_spi[] = {
    __GEN_SPI_REGS_TABLE(6358)
};

static const unsigned long bcm6368_regs_spi[] = {
    __GEN_SPI_REGS_TABLE(6368)
};

const unsigned long *bcm63xx_regs_spi;
EXPORT_SYMBOL(bcm63xx_regs_spi);

static __init void bcm63xx_spi_regs_init(void)
{
    if (BCMCPU_IS_6338())
        bcm63xx_regs_spi = bcm6338_regs_spi;
    if (BCMCPU_IS_6348())
        bcm63xx_regs_spi = bcm6348_regs_spi;
    if (BCMCPU_IS_6358())
        bcm63xx_regs_spi = bcm6358_regs_spi;
    if (BCMCPU_IS_6368())
        bcm63xx_regs_spi = bcm6368_regs_spi;
}
#else
static __init void bcm63xx_spi_regs_init(void) { }
#endif

static struct resource spi_resources[] = {
    {
        .start      = -1, /* filled at runtime */
        .end        = -1, /* filled at runtime */
        .flags      = IORESOURCE_MEM,
    },
    {
        .start      = -1, /* filled at runtime */
        .flags      = IORESOURCE_IRQ,
    },
};

static struct bcm63xx_spi_pdata spi_pdata = {
    .bus_num        = 0,
    .num_chipselect     = 8,
};

static struct platform_device bcm63xx_spi_device = {
    .name       = "bcm63xx-spi",
    .id     = -1,
    .num_resources  = ARRAY_SIZE(spi_resources),
    .resource   = spi_resources,
    .dev        = {
        .platform_data = &spi_pdata,
    },
};

int __init bcm63xx_spi_register(void)
{
    struct clk *periph_clk;

    if (BCMCPU_IS_6328() || BCMCPU_IS_6345())
        return -ENODEV;

    periph_clk = clk_get(NULL, "periph");
    if (IS_ERR(periph_clk)) {
        pr_err("unable to get periph clock\n");
        return -ENODEV;
    }

    /* Set bus frequency */
    spi_pdata.speed_hz = clk_get_rate(periph_clk);

    spi_resources[0].start = bcm63xx_regset_address(RSET_SPI);
    spi_resources[0].end = spi_resources[0].start;
    spi_resources[1].start = bcm63xx_get_irq_number(IRQ_SPI);

    if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
        spi_resources[0].end += BCM_6338_RSET_SPI_SIZE - 1;
        spi_pdata.fifo_size = SPI_6338_MSG_DATA_SIZE;
        spi_pdata.msg_type_shift = SPI_6338_MSG_TYPE_SHIFT;
        spi_pdata.msg_ctl_width = SPI_6338_MSG_CTL_WIDTH;
    }

    if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) {
        spi_resources[0].end += BCM_6358_RSET_SPI_SIZE - 1;
        spi_pdata.fifo_size = SPI_6358_MSG_DATA_SIZE;
        spi_pdata.msg_type_shift = SPI_6358_MSG_TYPE_SHIFT;
        spi_pdata.msg_ctl_width = SPI_6358_MSG_CTL_WIDTH;
    }

    bcm63xx_spi_regs_init();

    return platform_device_register(&bcm63xx_spi_device);
}