181 строка
4.0 KiB
C
181 строка
4.0 KiB
C
/* 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/export.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,
|
|
.tx_st_done = 21,
|
|
};
|
|
|
|
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,
|
|
.tx_st_done = 21,
|
|
};
|
|
|
|
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];
|
|
}
|