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/* linux/arch/arm/plat-s3c64xx/dev-spi.c
*
* Copyright (C) 2009 Samsung Electronics 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/kernel.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>
#include <mach/dma.h>
#include <mach/map.h>
#include <mach/spi-clocks.h>
#include <mach/irqs.h>
#include <plat/s3c64xx-spi.h>
#include <plat/gpio-cfg.h>
#include <plat/devs.h>
static char *spi_src_clks[] = {
[S3C64XX_SPI_SRCCLK_PCLK] = "pclk",
[S3C64XX_SPI_SRCCLK_SPIBUS] = "spi-bus",
[S3C64XX_SPI_SRCCLK_48M] = "spi_48m",
};
/* SPI Controller platform_devices */
/* Since we emulate multi-cs capability, we do not touch the GPC-3,7.
* 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 s3c64xx_spi_cfg_gpio(struct platform_device *pdev)
{
unsigned int base;
switch (pdev->id) {
case 0:
base = S3C64XX_GPC(0);
break;
case 1:
base = S3C64XX_GPC(4);
break;
default:
dev_err(&pdev->dev, "Invalid SPI Controller number!");
return -EINVAL;
}
s3c_gpio_cfgall_range(base, 3,
S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
return 0;
}
static struct resource s3c64xx_spi0_resource[] = {
[0] = {
.start = S3C64XX_PA_SPI0,
.end = S3C64XX_PA_SPI0 + 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 s3c64xx_spi0_pdata = {
.cfg_gpio = s3c64xx_spi_cfg_gpio,
.fifo_lvl_mask = 0x7f,
.rx_lvl_offset = 13,
};
static u64 spi_dmamask = DMA_BIT_MASK(32);
struct platform_device s3c64xx_device_spi0 = {
.name = "s3c64xx-spi",
.id = 0,
.num_resources = ARRAY_SIZE(s3c64xx_spi0_resource),
.resource = s3c64xx_spi0_resource,
.dev = {
.dma_mask = &spi_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
.platform_data = &s3c64xx_spi0_pdata,
},
};
EXPORT_SYMBOL(s3c64xx_device_spi0);
static struct resource s3c64xx_spi1_resource[] = {
[0] = {
.start = S3C64XX_PA_SPI1,
.end = S3C64XX_PA_SPI1 + 0x100 - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = DMACH_SPI1_TX,
.end = DMACH_SPI1_TX,
.flags = IORESOURCE_DMA,
},
[2] = {
.start = DMACH_SPI1_RX,
.end = DMACH_SPI1_RX,
.flags = IORESOURCE_DMA,
},
[3] = {
.start = IRQ_SPI1,
.end = IRQ_SPI1,
.flags = IORESOURCE_IRQ,
},
};
static struct s3c64xx_spi_info s3c64xx_spi1_pdata = {
.cfg_gpio = s3c64xx_spi_cfg_gpio,
.fifo_lvl_mask = 0x7f,
.rx_lvl_offset = 13,
};
struct platform_device s3c64xx_device_spi1 = {
.name = "s3c64xx-spi",
.id = 1,
.num_resources = ARRAY_SIZE(s3c64xx_spi1_resource),
.resource = s3c64xx_spi1_resource,
.dev = {
.dma_mask = &spi_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
.platform_data = &s3c64xx_spi1_pdata,
},
};
EXPORT_SYMBOL(s3c64xx_device_spi1);
void __init s3c64xx_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 > S3C64XX_SPI_SRCCLK_48M) {
printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
return;
}
switch (cntrlr) {
case 0:
pd = &s3c64xx_spi0_pdata;
break;
case 1:
pd = &s3c64xx_spi1_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];
}
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