/* linux/arch/arm/mach-s5p6442/dev-spi.c
*
* Copyright (C) 2010 Samsung Electronics Co. Ltd.
* Jaswinder Singh <jassi.brar@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <mach/dma.h>
#include <mach/map.h>
#include <mach/irqs.h>
#include <mach/gpio.h>
#include <mach/spi-clocks.h>
#include <plat/s3c64xx-spi.h>
#include <plat/gpio-cfg.h>
static char *spi_src_clks[] = {
[S5P6442_SPI_SRCCLK_PCLK] = "pclk",
[S5P6442_SPI_SRCCLK_SCLK] = "spi_epll",
};
/* SPI Controller platform_devices */
/* Since we emulate multi-cs capability, we do not touch the CS.
* The emulated CS is toggled by board specific mechanism, as it can
* be either some immediate GPIO or some signal out of some other
* chip in between ... or some yet another way.
* We simply do not assume anything about CS.
*/
static int s5p6442_spi_cfg_gpio(struct platform_device *pdev)
{
switch (pdev->id) {
case 0:
s3c_gpio_cfgpin(S5P6442_GPB(0), S3C_GPIO_SFN(2));
s3c_gpio_cfgpin(S5P6442_GPB(2), S3C_GPIO_SFN(2));
s3c_gpio_cfgpin(S5P6442_GPB(3), S3C_GPIO_SFN(2));
s3c_gpio_setpull(S5P6442_GPB(0), S3C_GPIO_PULL_UP);
s3c_gpio_setpull(S5P6442_GPB(2), S3C_GPIO_PULL_UP);
s3c_gpio_setpull(S5P6442_GPB(3), S3C_GPIO_PULL_UP);
break;
default:
dev_err(&pdev->dev, "Invalid SPI Controller number!");
return -EINVAL;
}
return 0;
}
static struct resource s5p6442_spi0_resource[] = {
[0] = {
.start = S5P6442_PA_SPI,
.end = S5P6442_PA_SPI + 0x100 - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = DMACH_SPI0_TX,
.end = DMACH_SPI0_TX,
.flags = IORESOURCE_DMA,
},
[2] = {
.start = DMACH_SPI0_RX,
.end = DMACH_SPI0_RX,
.flags = IORESOURCE_DMA,
},
[3] = {
.start = IRQ_SPI0,
.end = IRQ_SPI0,
.flags = IORESOURCE_IRQ,
},
};
static struct s3c64xx_spi_info s5p6442_spi0_pdata = {
.cfg_gpio = s5p6442_spi_cfg_gpio,
.fifo_lvl_mask = 0x1ff,
.rx_lvl_offset = 15,
};
static u64 spi_dmamask = DMA_BIT_MASK(32);
struct platform_device s5p6442_device_spi = {
.name = "s3c64xx-spi",
.id = 0,
.num_resources = ARRAY_SIZE(s5p6442_spi0_resource),
.resource = s5p6442_spi0_resource,
.dev = {
.dma_mask = &spi_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
.platform_data = &s5p6442_spi0_pdata,
},
};
void __init s5p6442_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
{
struct s3c64xx_spi_info *pd;
/* Reject invalid configuration */
if (!num_cs || src_clk_nr < 0
|| src_clk_nr > S5P6442_SPI_SRCCLK_SCLK) {
printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
return;
}
switch (cntrlr) {
case 0:
pd = &s5p6442_spi0_pdata;
break;
default:
printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
__func__, cntrlr);
return;
}
pd->num_cs = num_cs;
pd->src_clk_nr = src_clk_nr;
pd->src_clk_name = spi_src_clks[src_clk_nr];
}
