diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-s3c2442/mach-gta02.c | 214 |
1 files changed, 77 insertions, 137 deletions
diff --git a/arch/arm/mach-s3c2442/mach-gta02.c b/arch/arm/mach-s3c2442/mach-gta02.c index 26910a78721..55f9d946d4a 100644 --- a/arch/arm/mach-s3c2442/mach-gta02.c +++ b/arch/arm/mach-s3c2442/mach-gta02.c @@ -76,6 +76,7 @@ #include <mach/spi-gpio.h> #include <mach/usb-control.h> #include <mach/regs-mem.h> +#include <mach/spi-gpio.h> #include <plat/pwm.h> #include <mach/gta02.h> @@ -1104,124 +1105,7 @@ static struct glamo_spigpio_info glamo_spigpio_cfg = { .board_info = gta02_spi_board_info, }; -/* SPI: Accelerometers attached to SPI of s3c244x */ - -/* - * Situation is that Linux SPI can't work in an interrupt context, so we - * implement our own bitbang here. Arbitration is needed because not only - * can this interrupt happen at any time even if foreground wants to use - * the bitbang API from Linux, but multiple motion sensors can be on the - * same SPI bus, and multiple interrupts can happen. - * - * Foreground / interrupt arbitration is okay because the interrupts are - * disabled around all the foreground SPI code. - * - * Interrupt / Interrupt arbitration is evidently needed, otherwise we - * lose edge-triggered service after a while due to the two sensors sharing - * the SPI bus having irqs at the same time eventually. - * - * Servicing is typ 75 - 100us at 400MHz. - */ - -/* #define DEBUG_SPEW_MS */ -#define MG_PER_SAMPLE 18 - -struct lis302dl_platform_data lis302_pdata_top; -struct lis302dl_platform_data lis302_pdata_bottom; - -/* - * generic SPI RX and TX bitbang - * only call with interrupts off! - */ - -static void __gta02_lis302dl_bitbang(struct lis302dl_info *lis, u8 *tx, - int tx_bytes, u8 *rx, int rx_bytes) -{ - struct lis302dl_platform_data *pdata = lis->pdata; - int n; - u8 shifter = 0; - unsigned long other_cs; - - /* - * Huh... "quirk"... CS on this device is not really "CS" like you can - * expect. - * - * When it is 0 it selects SPI interface mode. - * When it is 1 it selects I2C interface mode. - * - * Because we have 2 devices on one interface we have to make sure - * that the "disabled" device (actually in I2C mode) don't think we're - * talking to it. - * - * When we talk to the "enabled" device, the "disabled" device sees - * the clocks as I2C clocks, creating havoc. - * - * I2C sees MOSI going LOW while CLK HIGH as a START action, thus we - * must ensure this is never issued. - */ - - if (&lis302_pdata_top == pdata) - other_cs = lis302_pdata_bottom.pin_chip_select; - else - other_cs = lis302_pdata_top.pin_chip_select; - - s3c2410_gpio_setpin(other_cs, 1); - s3c2410_gpio_setpin(pdata->pin_chip_select, 1); - s3c2410_gpio_setpin(pdata->pin_clk, 1); - s3c2410_gpio_setpin(pdata->pin_chip_select, 0); - - /* send the register index, r/w and autoinc bits */ - for (n = 0; n < (tx_bytes << 3); n++) { - if (!(n & 7)) - shifter = ~tx[n >> 3]; - s3c2410_gpio_setpin(pdata->pin_clk, 0); - s3c2410_gpio_setpin(pdata->pin_mosi, !(shifter & 0x80)); - s3c2410_gpio_setpin(pdata->pin_clk, 1); - shifter <<= 1; - } - - for (n = 0; n < (rx_bytes << 3); n++) { /* 8 bits each */ - s3c2410_gpio_setpin(pdata->pin_clk, 0); - shifter <<= 1; - if (s3c2410_gpio_getpin(pdata->pin_miso)) - shifter |= 1; - if ((n & 7) == 7) - rx[n >> 3] = shifter; - s3c2410_gpio_setpin(pdata->pin_clk, 1); - } - s3c2410_gpio_setpin(pdata->pin_chip_select, 1); - s3c2410_gpio_setpin(other_cs, 1); -} - - -static int gta02_lis302dl_bitbang_read_reg(struct lis302dl_info *lis, u8 reg) -{ - u8 data = 0xc0 | reg; /* read, autoincrement */ - unsigned long flags; - - local_irq_save(flags); - - __gta02_lis302dl_bitbang(lis, &data, 1, &data, 1); - - local_irq_restore(flags); - - return data; -} - -static void gta02_lis302dl_bitbang_write_reg(struct lis302dl_info *lis, u8 reg, - u8 val) -{ - u8 data[2] = { 0x00 | reg, val }; /* write, no autoincrement */ - unsigned long flags; - - local_irq_save(flags); - - __gta02_lis302dl_bitbang(lis, &data[0], 2, NULL, 0); - - local_irq_restore(flags); - -} - +/*----------- SPI: Accelerometers attached to SPI of s3c244x ----------------- */ void gta02_lis302dl_suspend_io(struct lis302dl_info *lis, int resume) { @@ -1253,8 +1137,6 @@ void gta02_lis302dl_suspend_io(struct lis302dl_info *lis, int resume) } - - struct lis302dl_platform_data lis302_pdata_top = { .name = "lis302-1 (top)", .pin_chip_select= S3C2410_GPD12, @@ -1263,9 +1145,6 @@ struct lis302dl_platform_data lis302_pdata_top = { .pin_miso = S3C2410_GPG5, .interrupt = GTA02_IRQ_GSENSOR_1, .open_drain = 1, /* altered at runtime by PCB rev */ - .lis302dl_bitbang = __gta02_lis302dl_bitbang, - .lis302dl_bitbang_reg_read = gta02_lis302dl_bitbang_read_reg, - .lis302dl_bitbang_reg_write = gta02_lis302dl_bitbang_write_reg, .lis302dl_suspend_io = gta02_lis302dl_suspend_io, }; @@ -1277,29 +1156,91 @@ struct lis302dl_platform_data lis302_pdata_bottom = { .pin_miso = S3C2410_GPG5, .interrupt = GTA02_IRQ_GSENSOR_2, .open_drain = 1, /* altered at runtime by PCB rev */ - .lis302dl_bitbang = __gta02_lis302dl_bitbang, - .lis302dl_bitbang_reg_read = gta02_lis302dl_bitbang_read_reg, - .lis302dl_bitbang_reg_write = gta02_lis302dl_bitbang_write_reg, .lis302dl_suspend_io = gta02_lis302dl_suspend_io, }; +static struct spi_board_info lis302dl_spi_board_info[] = { + { + .modalias = "lis302dl", + /* platform_data */ + .platform_data = &lis302_pdata_top, + /* controller_data */ + /* irq */ + .max_speed_hz = 100 * 1000, + .bus_num = 3, + .chip_select = 0, + }, -static struct platform_device s3c_device_spi_acc1 = { - .name = "lis302dl", - .id = 1, - .dev = { - .platform_data = &lis302_pdata_top, + { + .modalias = "lis302dl", + /* platform_data */ + .platform_data = &lis302_pdata_bottom, + /* controller_data */ + /* irq */ + .max_speed_hz = 100 * 1000, + .bus_num = 3, + .chip_select = 1, }, }; -static struct platform_device s3c_device_spi_acc2 = { - .name = "lis302dl", - .id = 2, +static void gta02_lis302_chip_select(struct s3c2410_spigpio_info *info, int csid, int cs) +{ + + /* + * Huh... "quirk"... CS on this device is not really "CS" like you can + * expect. + * + * When it is 0 it selects SPI interface mode. + * When it is 1 it selects I2C interface mode. + * + * Because we have 2 devices on one interface we have to make sure + * that the "disabled" device (actually in I2C mode) don't think we're + * talking to it. + * + * When we talk to the "enabled" device, the "disabled" device sees + * the clocks as I2C clocks, creating havoc. + * + * I2C sees MOSI going LOW while CLK HIGH as a START action, thus we + * must ensure this is never issued. + */ + + int cs_gpio, other_cs_gpio; + + cs_gpio = csid ? S3C2410_GPD13 : S3C2410_GPD12; + other_cs_gpio = (1 - csid) ? S3C2410_GPD13 : S3C2410_GPD12; + + + if (cs == BITBANG_CS_ACTIVE) { + s3c2410_gpio_setpin(other_cs_gpio, 1); + s3c2410_gpio_setpin(cs_gpio, 1); + s3c2410_gpio_setpin(info->pin_clk, 1); + s3c2410_gpio_setpin(cs_gpio, 0); + } else { + s3c2410_gpio_setpin(cs_gpio, 1); + s3c2410_gpio_setpin(other_cs_gpio, 1); + } +} + +static struct s3c2410_spigpio_info gta02_spigpio_cfg = { + .pin_clk = S3C2410_GPG7, + .pin_mosi = S3C2410_GPG6, + .pin_miso = S3C2410_GPG5, + .board_size = ARRAY_SIZE(lis302dl_spi_board_info), + .board_info = lis302dl_spi_board_info, + .num_chipselect = 2, + .chip_select = gta02_lis302_chip_select, + .non_blocking_transfer = 1, +}; + +static struct platform_device gta02_spi_gpio_dev = { + .name = "spi_s3c24xx_gpio", .dev = { - .platform_data = &lis302_pdata_bottom, + .platform_data = >a02_spigpio_cfg, }, }; +/*----------- / SPI: Accelerometers attached to SPI of s3c244x ----------------- */ + static struct resource gta02_led_resources[] = { { .name = "gta02-power:orange", @@ -1576,8 +1517,7 @@ static struct platform_device *gta02_devices_pmu_children[] = { &s3c_device_ts, /* input 1 */ >a02_pm_gsm_dev, >a02_pm_usbhost_dev, - &s3c_device_spi_acc1, /* input 2 */ - &s3c_device_spi_acc2, /* input 3 */ + >a02_spi_gpio_dev, /* input 2 and 3 */ >a02_button_dev, /* input 4 */ >a02_resume_reason_device, }; |