我用的系統是ubuntu13.04。
tiny6410的開發板。
首先，對友善提供的內核進行配置。如圖
第二步，
打開arch/arm/mach_s3c64XX/mach_mini6410.c
增加代碼：
static void cs_set_level(unsigned line_id, int lvl) {
gpio_direction_output(line_id, lvl);
}
static struct s3c64xx_spi_csinfo s3c64xx_spi0_csinfo = {
.fb_delay=100,
.line=S3C64XX_GPC(3),
.set_level=cs_set_level,
};
static struct spi_board_info s3c6410_spi0_board[] = {
[0] = {
.modalias = "spidev",
.bus_num= 0,
.chip_select= 0,
.irq =IRQ_SPI0,
.max_speed_hz= 500*1000,
.mode=SPI_MODE_0,
.controller_data=&s3c64xx_spi0_csinfo,
},
};
static struct s3c64xx_spi_csinfo s3c64xx_spi1_csinfo = {
.fb_delay=100,
.line=S3C64XX_GPC(7),
.set_level=cs_set_level,
};
static struct spi_board_info s3c6410_spi1_board[] = {
[0] = {
.modalias = "spidev",
.bus_num= 1,
.chip_select= 0,
.irq = IRQ_SPI1,
.max_speed_hz = 500*1000,
.mode=SPI_MODE_0,
.controller_data=&s3c64xx_spi1_csinfo,
},
};
找到mini6410_devices這個結構,加下面兩行,
&s3c64xx_device_spi0,
&s3c64xx_device_spi1,
加入到mini6410_devices結構中，就可以將設備s3c64xx-spi.0和s3c64xx-spi.1進行初始化，
在函數 mini6410_machine_init中添加：
s3c64xx_spi_set_info(0,0,2);
s3c64xx_spi_set_info(1,0,2);
spi_register_board_info(s3c6410_spi0_board, ARRAY_SIZE(s3c6410_spi0_board));
spi_register_board_info(s3c6410_spi1_board, ARRAY_SIZE(s3c6410_spi1_board));
mach_mini6410.c頭文件裏面添加頭文件
#include <linux/spi/spidev.h>
#include <linux/spi/spi.h>
#include <plat/s3c64xx-spi.h>
下面是我加好的。可以用來參考
/* linux/arch/arm/mach-s3c64xx/mach-mini6410.c
*
* Copyright 2010 FriendlyARM (www.arm9.net)
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <[email protected]>
* http://armlinux.simtec.co.uk/
*
* 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/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/dm9000.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/proc_fs.h>
#include <video/platform_lcd.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <mach/hardware.h>
#include <mach/regs-fb.h>
#include <mach/map.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <plat/regs-serial.h>
#include <mach/regs-modem.h>
#include <mach/regs-gpio.h>
#include <mach/regs-sys.h>
#include <mach/regs-srom.h>
#include <plat/iic.h>
#include <plat/fb.h>
#include <plat/gpio-cfg.h>
#include <plat/nand.h>
#include <mach/s3c6410.h>
#include <plat/clock.h>
#include <plat/devs.h>
#include <plat/cpu.h>
#include <plat/adc.h>
#include <mach/ts.h>
#include <plat/regs-usb-hsotg-phy.h>
#include <plat/audio.h>
#include <plat/fimc.h>
#include <linux/mmc/host.h>
#include <plat/sdhci.h>
#include <linux/spi/spidev.h>
#include <linux/spi/spi.h>
#include <plat/s3c64xx-spi.h>
#define UCON S3C2410_UCON_DEFAULT | S3C2410_UCON_UCLK
#define ULCON S3C2410_LCON_CS8 | S3C2410_LCON_PNONE | S3C2410_LCON_STOPB
#define UFCON S3C2410_UFCON_RXTRIG8 | S3C2410_UFCON_FIFOMODE
extern void s3c64xx_reserve_bootmem(void);
extern int s3c_media_read_proc(char *buf, char **start, off_t offset,
int count, int *eof, void *data);
static struct s3c2410_uartcfg mini6410_uartcfgs[] __initdata = {
[0] = {
.hwport = 0,
.flags = 0,
.ucon = UCON,
.ulcon = ULCON,
.ufcon = UFCON,
},
[1] = {
.hwport = 1,
.flags = 0,
.ucon = UCON,
.ulcon = ULCON,
.ufcon = UFCON,
},
[2] = {
.hwport = 2,
.flags = 0,
.ucon = UCON,
.ulcon = ULCON,
.ufcon = UFCON,
},
[3] = {
.hwport = 3,
.flags = 0,
.ucon = UCON,
.ulcon = ULCON,
.ufcon = UFCON,
},
};
/* framebuffer and LCD setup. */
/* GPF15 = LCD backlight control
* GPF13 => Panel power
* GPN5 = LCD nRESET signal
* PWM_TOUT1 => backlight brightness
*/
static void mini6410_lcd_power_set(struct plat_lcd_data *pd,
unsigned int power)
{
if (power) {
gpio_direction_output(S3C64XX_GPF(13), 1);
gpio_direction_output(S3C64XX_GPF(15), 1);
/* fire nRESET on power up */
gpio_direction_output(S3C64XX_GPN(5), 0);
msleep(10);
gpio_direction_output(S3C64XX_GPN(5), 1);
msleep(1);
} else {
gpio_direction_output(S3C64XX_GPF(15), 0);
gpio_direction_output(S3C64XX_GPF(13), 0);
}
}
static struct plat_lcd_data mini6410_lcd_power_data = {
.set_power = mini6410_lcd_power_set,
};
static struct platform_device mini6410_lcd_powerdev = {
.name = "platform-lcd",
.dev.parent = &s3c_device_fb.dev,
.dev.platform_data = &mini6410_lcd_power_data,
};
static struct s3c_fb_pd_win mini6410_fb_win0 = {
/* this is to ensure we use win0 */
.win_mode = {
#if 0
.pixclock = 115440,
#endif
.left_margin = 0x03,
.right_margin = 0x02,
.upper_margin = 0x01,
.lower_margin = 0x01,
.hsync_len = 0x28,
.vsync_len = 0x01,
.xres = 480,
.yres = 272,
},
.max_bpp = 32,
.default_bpp = 16,
};
/* 405566 clocks per frame => 60Hz refresh requires 24333960Hz clock */
static struct s3c_fb_platdata mini6410_lcd_pdata __initdata = {
.setup_gpio = s3c64xx_fb_gpio_setup_24bpp,
.win[0] = &mini6410_fb_win0,
.vidcon0 = VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
.vidcon1 = VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
};
/* MMC/SD config */
static struct s3c_sdhci_platdata mini6410_hsmmc0_pdata = {
.max_width = 4,
.cd_type = S3C_SDHCI_CD_INTERNAL,
};
static struct s3c_sdhci_platdata mini6410_hsmmc1_pdata = {
.max_width = 4,
.cd_type = S3C_SDHCI_CD_PERMANENT,
};
/* Nand flash */
struct mtd_partition mini6410_nand_part[] = {
{
.name = "Bootloader",
.offset = 0,
.size = (4 * 128 *SZ_1K),
.mask_flags = MTD_CAP_NANDFLASH,
},
{
.name = "Kernel",
.offset = (4 * 128 *SZ_1K),
.size = (5*SZ_1M) ,
.mask_flags = MTD_CAP_NANDFLASH,
},
{
.name = "File System",
.offset = MTDPART_OFS_APPEND,
.size = MTDPART_SIZ_FULL,
}
};
static struct s3c2410_nand_set mini6410_nand_sets[] = {
[0] = {
.name = "nand",
.nr_chips = 1,
.nr_partitions = ARRAY_SIZE(mini6410_nand_part),
.partitions = mini6410_nand_part,
},
};
static struct s3c2410_platform_nand mini6410_nand_info = {
.tacls = 25,
.twrph0 = 55,
.twrph1 = 40,
.nr_sets = ARRAY_SIZE(mini6410_nand_sets),
.sets = mini6410_nand_sets,
};
#ifdef CONFIG_USB_SUPPORT
/* Initializes OTG Phy. to output 48M clock */
void s3c_otg_phy_config(int enable) {
u32 val;
if (enable) {
__raw_writel(0x0, S3C_PHYPWR); /* Power up */
val = __raw_readl(S3C_PHYCLK);
val &= ~S3C_PHYCLK_CLKSEL_MASK;
__raw_writel(val, S3C_PHYCLK);
__raw_writel(0x1, S3C_RSTCON);
udelay(5);
__raw_writel(0x0, S3C_RSTCON); /* Finish the reset */
udelay(5);
} else {
__raw_writel(0x19, S3C_PHYPWR); /* Power down */
}
}
EXPORT_SYMBOL(s3c_otg_phy_config);
#endif
static void cs_set_level(unsigned line_id, int lvl) {
gpio_direction_output(line_id, lvl);
}
static struct s3c64xx_spi_csinfo s3c64xx_spi0_csinfo = {
.fb_delay=100,
.line=S3C64XX_GPC(3),
.set_level=cs_set_level,
};
static struct spi_board_info s3c6410_spi0_board[] = {
[0] = {
.modalias = "spidev",
.bus_num= 0,
.chip_select= 0,
.irq =IRQ_SPI0,
.max_speed_hz= 500*1000,
.mode=SPI_MODE_0,
.controller_data=&s3c64xx_spi0_csinfo,
},
};
static struct s3c64xx_spi_csinfo s3c64xx_spi1_csinfo = {
.fb_delay=100,
.line=S3C64XX_GPC(7),
.set_level=cs_set_level,
};
static struct spi_board_info s3c6410_spi1_board[] = {
[0] = {
.modalias = "spidev",
.bus_num= 1,
.chip_select= 0,
.irq = IRQ_SPI1,
.max_speed_hz = 500*1000,
.mode=SPI_MODE_0,
.controller_data=&s3c64xx_spi1_csinfo,
},
};
/* Ethernet */
#ifdef CONFIG_DM9000
#define S3C64XX_PA_DM9000 (0x18000000)
#define S3C64XX_SZ_DM9000 SZ_1M
#define S3C64XX_VA_DM9000 S3C_ADDR(0x03b00300)
static struct resource dm9000_resources[] = {
[0] = {
.start = S3C64XX_PA_DM9000,
.end = S3C64XX_PA_DM9000 + 3,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = S3C64XX_PA_DM9000 + 4,
.end = S3C64XX_PA_DM9000 + S3C64XX_SZ_DM9000 - 1,
.flags = IORESOURCE_MEM,
},
[2] = {
.start = IRQ_EINT(7),
.end = IRQ_EINT(7),
.flags = IORESOURCE_IRQ | IRQF_TRIGGER_HIGH,
},
};
static struct dm9000_plat_data dm9000_setup = {
.flags = DM9000_PLATF_16BITONLY,
.dev_addr = { 0x08, 0x90, 0x00, 0xa0, 0x90, 0x90 },
};
static struct platform_device s3c_device_dm9000 = {
.name = "dm9000",
.id = 0,
.num_resources = ARRAY_SIZE(dm9000_resources),
.resource = dm9000_resources,
.dev = {
.platform_data = &dm9000_setup,
}
};
static int __init dm9000_set_mac(char *str) {
unsigned char addr[6];
unsigned int val;
int idx = 0;
char *p = str, *end;
while (*p && idx < 6) {
val = simple_strtoul(p, &end, 16);
if (end <= p) {
/* convert failed */
break;
} else {
addr[idx++] = val;
p = end;
if (*p == ':'|| *p == '-') {
p++;
} else {
break;
}
}
}
if (idx == 6) {
printk("Setup ethernet address to %pM\n", addr);
memcpy(dm9000_setup.param_addr, addr, 6);
}
return 1;
}
__setup("ethmac=", dm9000_set_mac);
#endif
static struct map_desc mini6410_iodesc[] = {
{
/* LCD support */
.virtual = (unsigned long)S3C_VA_LCD,
.pfn = __phys_to_pfn(S3C_PA_FB),
.length = SZ_16K,
.type = MT_DEVICE,
},
#ifdef CONFIG_DM9000
{
.virtual = (u32)S3C64XX_VA_DM9000,
.pfn = __phys_to_pfn(S3C64XX_PA_DM9000),
.length = S3C64XX_SZ_DM9000,
.type = MT_DEVICE,
},
#endif
};
static struct platform_device *mini6410_devices[] __initdata = {
#ifdef CONFIG_MINI6410_SD_CH0
&s3c_device_hsmmc0,
#endif
#ifdef CONFIG_MINI6410_SD_CH1
&s3c_device_hsmmc1,
#endif
&s3c_device_i2c0,
#ifdef CONFIG_S3C_DEV_I2C1
&s3c_device_i2c1,
#endif
&s3c_device_nand,
&s3c_device_fb,
&s3c_device_ohci,
&s3c_device_usb_hsotg,
#ifdef CONFIG_SND_SAMSUNG_AC97
&s3c64xx_device_ac97,
#else
&s3c64xx_device_iisv4,
#endif
&samsung_asoc_dma,
&mini6410_lcd_powerdev,
#ifdef CONFIG_DM9000
&s3c_device_dm9000,
#endif
#ifdef CONFIG_S3C_ADC
&s3c_device_adc,
#endif
#if defined(CONFIG_TOUCHSCREEN_MINI6410) || defined(CONFIG_SAMSUNG_DEV_TS)
&s3c_device_ts,
#endif
&s3c_device_wdt,
#ifdef CONFIG_S3C_DEV_RTC
&s3c_device_rtc,
#endif
/* Multimedia support */
#ifdef CONFIG_VIDEO_SAMSUNG
&s3c_device_vpp,
&s3c_device_mfc,
&s3c_device_tvenc,
&s3c_device_tvscaler,
&s3c_device_rotator,
&s3c_device_jpeg,
&s3c_device_fimc0,
&s3c_device_fimc1,
&s3c_device_g2d,
&s3c_device_g3d,
#endif
&s3c64xx_device_spi0,
&s3c64xx_device_spi1,
};
static struct i2c_board_info i2c_devs0[] __initdata = {
{ I2C_BOARD_INFO("ov965x", 0x30), },
};
static struct i2c_board_info i2c_devs1[] __initdata = {
/* Add your i2c device here */
};
#ifdef CONFIG_SAMSUNG_DEV_TS
static struct s3c2410_ts_mach_info s3c_ts_platform __initdata = {
.delay = 10000,
.presc = 49,
.oversampling_shift = 2,
};
#endif
#ifdef CONFIG_TOUCHSCREEN_MINI6410
static struct s3c_ts_mach_info s3c_ts_platform __initdata = {
.delay = 0xFFFF,
.presc = 0xFF,
.oversampling_shift = 2,
.resol_bit = 12,
.s3c_adc_con = ADC_TYPE_2,
};
#endif
static void __init mini6410_map_io(void)
{
u32 tmp;
s3c64xx_init_io(mini6410_iodesc, ARRAY_SIZE(mini6410_iodesc));
s3c24xx_init_clocks(12000000);
s3c24xx_init_uarts(mini6410_uartcfgs, ARRAY_SIZE(mini6410_uartcfgs));
/* set the LCD type */
tmp = __raw_readl(S3C64XX_SPCON);
tmp &= ~S3C64XX_SPCON_LCD_SEL_MASK;
tmp |= S3C64XX_SPCON_LCD_SEL_RGB;
__raw_writel(tmp, S3C64XX_SPCON);
/* remove the lcd bypass */
tmp = __raw_readl(S3C64XX_MODEM_MIFPCON);
tmp &= ~MIFPCON_LCD_BYPASS;
__raw_writel(tmp, S3C64XX_MODEM_MIFPCON);
#ifdef CONFIG_VIDEO_SAMSUNG
s3c64xx_reserve_bootmem();
#endif
}
static void __init mini6410_machine_init(void)
{
u32 cs1;
s3c_i2c0_set_platdata(NULL);
#ifdef CONFIG_S3C_DEV_I2C1
s3c_i2c1_set_platdata(NULL);
#endif
s3c_fb_set_platdata(&mini6410_lcd_pdata);
#ifdef CONFIG_SAMSUNG_DEV_TS
s3c24xx_ts_set_platdata(&s3c_ts_platform);
#endif
#ifdef CONFIG_TOUCHSCREEN_MINI6410
s3c_ts_set_platdata(&s3c_ts_platform);
#endif
s3c_sdhci0_set_platdata(&mini6410_hsmmc0_pdata);
s3c_sdhci1_set_platdata(&mini6410_hsmmc1_pdata);
#ifdef CONFIG_MTD_NAND_S3C
s3c_device_nand.name = "s3c6410-nand";
#endif
s3c_nand_set_platdata(&mini6410_nand_info);
s3c64xx_ac97_setup_gpio(0);
/* configure nCS1 width to 16 bits */
cs1 = __raw_readl(S3C64XX_SROM_BW) &
~(S3C64XX_SROM_BW__CS_MASK << S3C64XX_SROM_BW__NCS1__SHIFT);
cs1 |= ((1 << S3C64XX_SROM_BW__DATAWIDTH__SHIFT) |
(1 << S3C64XX_SROM_BW__WAITENABLE__SHIFT) |
(1 << S3C64XX_SROM_BW__BYTEENABLE__SHIFT)) <<
S3C64XX_SROM_BW__NCS1__SHIFT;
__raw_writel(cs1, S3C64XX_SROM_BW);
/* set timing for nCS1 suitable for ethernet chip */
__raw_writel((0 << S3C64XX_SROM_BCX__PMC__SHIFT) |
(6 << S3C64XX_SROM_BCX__TACP__SHIFT) |
(4 << S3C64XX_SROM_BCX__TCAH__SHIFT) |
(1 << S3C64XX_SROM_BCX__TCOH__SHIFT) |
(0xe << S3C64XX_SROM_BCX__TACC__SHIFT) |
(4 << S3C64XX_SROM_BCX__TCOS__SHIFT) |
(0 << S3C64XX_SROM_BCX__TACS__SHIFT), S3C64XX_SROM_BC1);
gpio_request(S3C64XX_GPN(5), "LCD power");
gpio_request(S3C64XX_GPF(13), "LCD power");
gpio_request(S3C64XX_GPF(15), "LCD power");
if (ARRAY_SIZE(i2c_devs0)) {
i2c_register_board_info(0, i2c_devs0, ARRAY_SIZE(i2c_devs0));
}
if (ARRAY_SIZE(i2c_devs1)) {
i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));
}
#ifdef CONFIG_S3C64XX_DEV_FIMC0
s3c_fimc0_set_platdata(NULL);
#endif
#ifdef CONFIG_S3C64XX_DEV_FIMC1
s3c_fimc1_set_platdata(NULL);
#endif
platform_add_devices(mini6410_devices, ARRAY_SIZE(mini6410_devices));
#ifdef CONFIG_VIDEO_SAMSUNG
create_proc_read_entry("videomem", 0, NULL, s3c_media_read_proc, NULL);
#endif
s3c64xx_spi_set_info(0,0,2);
s3c64xx_spi_set_info(1,0,2);
spi_register_board_info(s3c6410_spi0_board, ARRAY_SIZE(s3c6410_spi0_board));
spi_register_board_info(s3c6410_spi1_board, ARRAY_SIZE(s3c6410_spi1_board));
}
MACHINE_START(MINI6410, "MINI6410")
/* Maintainer: Ben Dooks <[email protected]> */
.boot_params = S3C64XX_PA_SDRAM + 0x100,
.init_irq = s3c6410_init_irq,
.map_io = mini6410_map_io,
.init_machine = mini6410_machine_init,
.timer = &s3c24xx_timer,
MACHINE_END在此目錄中找到：Makefile，打開
修改成
# device support
obj-y += dev-uart.o
obj-y += dev-audio.o
obj-y += dev-spi.o
Makefile文件如下
# arch/arm/mach-s3c64xx/Makefile
#
# Copyright 2008 Openmoko, Inc.
# Copyright 2008 Simtec Electronics
#
# Licensed under GPLv2
obj-y :=
obj-m :=
obj-n :=
obj- :=
# Core files
obj-y += cpu.o
obj-y += clock.o
obj-y += gpiolib.o
# Core support for S3C6400 system
obj-$(CONFIG_CPU_S3C6400) += s3c6400.o
obj-$(CONFIG_CPU_S3C6410) += s3c6410.o
obj-y += irq.o
obj-y += irq-eint.o
# CPU frequency scaling
obj-$(CONFIG_CPU_FREQ_S3C64XX) += cpufreq.o
# DMA support
obj-$(CONFIG_S3C64XX_DMA) += dma.o
# Device setup
obj-$(CONFIG_S3C64XX_SETUP_I2C0) += setup-i2c0.o
obj-$(CONFIG_S3C64XX_SETUP_I2C1) += setup-i2c1.o
obj-$(CONFIG_S3C64XX_SETUP_IDE) += setup-ide.o
obj-$(CONFIG_S3C64XX_SETUP_KEYPAD) += setup-keypad.o
obj-$(CONFIG_S3C64XX_SETUP_SDHCI) += setup-sdhci.o
obj-$(CONFIG_S3C64XX_SETUP_FB_24BPP) += setup-fb-24bpp.o
obj-$(CONFIG_S3C64XX_SETUP_SDHCI_GPIO) += setup-sdhci-gpio.o
# PM
obj-$(CONFIG_PM) += pm.o
obj-$(CONFIG_PM) += sleep.o
obj-$(CONFIG_PM) += irq-pm.o
# Machine support
obj-$(CONFIG_MACH_ANW6410) += mach-anw6410.o
obj-$(CONFIG_MACH_SMDK6400) += mach-smdk6400.o
obj-$(CONFIG_MACH_SMDK6410) += mach-smdk6410.o
obj-$(CONFIG_MACH_MINI6410) += mach-mini6410.o
obj-$(CONFIG_MACH_REAL6410) += mach-real6410.o
obj-$(CONFIG_MACH_NCP) += mach-ncp.o
obj-$(CONFIG_MACH_HMT) += mach-hmt.o
obj-$(CONFIG_MACH_SMARTQ) += mach-smartq.o
obj-$(CONFIG_MACH_SMARTQ5) += mach-smartq5.o
obj-$(CONFIG_MACH_SMARTQ7) += mach-smartq7.o
# device support
obj-y += dev-uart.o
obj-y += dev-audio.o
obj-y += dev-spi.o
#obj-$(CONFIG_S3C64XX_DEV_SPI) += dev-spi.o
obj-$(CONFIG_S3C64XX_DEV_TS) += dev-ts.o
obj-$(CONFIG_S3C64XX_DEV_ONENAND1) += dev-onenand1.o
obj-$(CONFIG_TOUCHSCREEN_MINI6410) += dev-ts-mini6410.o現在成功編譯make zImage
給板子重新刷上系統，就可以在dev下看到spidev0.0,spidev1.0了
最後測試spi口
使用Linux源碼包下的linux/Documentation/spi/spidev_test.c 程序來檢測
# gedit spidev_test.c 修改 spidev1.1 爲 spidev1.0
# arm-linux-gcc spidev_test.c -o spi
將編譯好的程序下到板子上
用一根跳線將CON11（SDIO）接口的7針腳和8針腳連接
[root@FriendlyARM spitest]# ./spi
spi mode: 0
bits per word: 8
max speed: 496268 Hz (496 KHz)
FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D
這時候，你也可以用示波器來觀察spi的時序。