diff options
| -rw-r--r-- | io-module/adc.c | 126 | ||||
| -rw-r--r-- | io-module/mt100eocg.c | 74 | ||||
| -rw-r--r-- | io-module/mts-io.c | 15 |
3 files changed, 174 insertions, 41 deletions
diff --git a/io-module/adc.c b/io-module/adc.c new file mode 100644 index 0000000..3d5f3d0 --- /dev/null +++ b/io-module/adc.c @@ -0,0 +1,126 @@ +#define AT91SAM9X5_BASE_ADC 0xf804c000 +#define AT91SAM9260_BASE_ADC 0xfffe0000 + +#define ADC_SHTIME_DEFAULT 0x05 +#define ADC_STARTUP_DEFAULT 0x04 +#define ADC_PRESCALE_DEFAULT 0x3F +#define ADC_MODE_DEFAULT \ + ((ADC_SHTIME_DEFAULT & 0x0F) << 24) | \ + ((ADC_STARTUP_DEFAULT & 0x1F) << 16) | \ + ((ADC_PRESCALE_DEFAULT & 0x3F) << 8) + +#define ADC_CR_OFFSET 0x00 +#define ADC_MR_OFFSET 0x04 +#define ADC_CHER_OFFSET 0x10 +#define ADC_CHDR_OFFSET 0x14 +#define ADC_CHSR_OFFSET 0x18 +#define ADC_SR_OFFSET 0x1C +#define ADC_LDCR_OFFSET 0x20 +#define ADC_IER_OFFSET 0x14 +#define ADC_IDR_OFFSET 0x28 +#define ADC_IMR_OFFSET 0x2C +#define ADC_CDR0_OFFSET 0x30 +#define ADC_CDR1_OFFSET 0x34 +#define ADC_CDR2_OFFSET 0x38 +#define ADC_CDR3_OFFSET 0x3C + +void __iomem *adc_base; +struct clk *adc_clk; + +#define ADC_CONVERT_RESET(base) writel(0x01, (base) + ADC_CR_OFFSET) +#define ADC_CONVERT_START(base) writel(0x02, (base) + ADC_CR_OFFSET) + +static ssize_t mts_attr_show_adc(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int offset; + u32 value; + u32 chan_mask; + + if (!DEVICE_CAPA(id_eeprom.capa, CAPA_ADC)) { + log_debug("ADC not available"); + return -ENODEV; + } + + if (!strcmp(attr->attr.name, "adc0")) { + offset = ADC_CDR0_OFFSET; + chan_mask = 0x01; + } else if (!strcmp(attr->attr.name, "adc1")) { + offset = ADC_CDR1_OFFSET; + chan_mask = 0x02; + } else if (!strcmp(attr->attr.name, "adc2")) { + offset = ADC_CDR2_OFFSET; + chan_mask = 0x04; + } else if (!strcmp(attr->attr.name, "adc3")) { + offset = ADC_CDR3_OFFSET; + chan_mask = 0x08; + } else { + log_notice("adc attr does not exist"); + return -ENOENT; + } + + mutex_lock(&mts_io_mutex); + + // disable all channels and enable the one we want + writel(0x0F, adc_base + ADC_CHDR_OFFSET); + writel(chan_mask, adc_base + ADC_CHER_OFFSET); + + ADC_CONVERT_START(adc_base); + + // wait for conversion to complete (EOC bit set) + value = 0; + while (value != chan_mask) { + value = readl(adc_base + ADC_SR_OFFSET) & chan_mask; + log_debug("ADC_SR EOC [%X]", value); + } + + // read result + value = readl(adc_base + offset); + + mutex_unlock(&mts_io_mutex); + + return sprintf(buf, "%lu\n", (unsigned long) value); +} + +static DEVICE_ATTR_RO_MTS(dev_attr_adc0, "adc0", mts_attr_show_adc); +static DEVICE_ATTR_RO_MTS(dev_attr_adc1, "adc1", mts_attr_show_adc); +static DEVICE_ATTR_RO_MTS(dev_attr_adc2, "adc2", mts_attr_show_adc); +static DEVICE_ATTR_RO_MTS(dev_attr_adc3, "adc3", mts_attr_show_adc); + +static int mts_io_board_adc_probe(struct platform_device *pdev) +{ + int err; + adc_clk = clk_get(&pdev->dev, "adc_clk"); + if (adc_clk) { + err = clk_prepare_enable(adc_clk); + if (err) { + log_error("clock failed to prepare+enable: %d\n", err); + return err; + } + #ifdef CONFIG_SOC_AT91SAM9X5 + adc_base = ioremap(AT91SAM9X5_BASE_ADC, SZ_16K); + #else + adc_base = ioremap(AT91SAM9260_BASE_ADC, SZ_16K); + #endif + if (!adc_base) { + log_error("ioremap failed.\n"); + return -ENOMEM; + } + ADC_CONVERT_RESET(adc_base); + writel(ADC_MODE_DEFAULT, adc_base + ADC_MR_OFFSET); + writel(0x000F0F0F, adc_base + ADC_IDR_OFFSET); + writel(0x0F, adc_base + ADC_CHDR_OFFSET); + } + return 0; +} + +static int mts_io_board_adc_remove(struct platform_device *pdev) +{ + if (adc_clk) { + int ret; + clk_disable_unprepare(adc_clk); + } + return 0; +} + diff --git a/io-module/mt100eocg.c b/io-module/mt100eocg.c index ad22d22..749b85a 100644 --- a/io-module/mt100eocg.c +++ b/io-module/mt100eocg.c @@ -1,6 +1,38 @@ #include "at91gpio.h" /* Used for both MT100EOCG 0.0 */ static struct gpio_pin gpio_pins_mt100eocg_0_0[] = { + { + .name = "ADC0", + .pin = { + .label = "adc0", + .gpio = AT91_PIN_PC0, + .flags = GPIOF_IN, + }, + }, + { + .name = "ADC1", + .pin = { + .label = "adc1", + .gpio = AT91_PIN_PC1, + .flags = GPIOF_IN, + }, + }, + { + .name = "ADC2", + .pin = { + .label = "adc2", + .gpio = AT91_PIN_PC2, + .flags = GPIOF_IN, + }, + }, + { + .name = "ADC3", + .pin = { + .label = "adc3", + .gpio = AT91_PIN_PC3, + .flags = GPIOF_IN, + }, + }, { .name = "DTR1", .pin = { @@ -101,38 +133,6 @@ static struct gpio_pin gpio_pins_mt100eocg_0_0[] = { }, /* { - .name = "ADC0", - .pin = { - .label = "adc0", - .gpio = AT91_PIN_PC0, - .flags = GPIOF_IN, - }, - }, - { - .name = "ADC1", - .pin = { - .label = "adc1", - .gpio = AT91_PIN_PC1, - .flags = GPIOF_IN, - }, - }, - { - .name = "ADC2", - .pin = { - .label = "adc2", - .gpio = AT91_PIN_PC2, - .flags = GPIOF_IN, - }, - }, - { - .name = "ADC3", - .pin = { - .label = "adc3", - .gpio = AT91_PIN_PC3, - .flags = GPIOF_IN, - }, - }, - { .name = "TXD1", .pin = { .gpio = AT91_PIN_PB17, @@ -216,10 +216,10 @@ static struct attribute *mt100eocg_platform_attributes[] = { &dev_attr_gpo2.attr, &dev_attr_gpo3.attr, &dev_attr_gpo4.attr, -// +// // SPI &dev_attr_led1.attr, -// +// &dev_attr_led2.attr, // AT91_PIN_PA30 &dev_attr_led3.attr, // AT91_PIN_PC9 // SPI @@ -227,7 +227,7 @@ static struct attribute *mt100eocg_platform_attributes[] = { &dev_attr_led5.attr, &dev_attr_led6.attr, // -// SPI +// SPI &dev_attr_gpi5.attr, &dev_attr_gpi6.attr, &dev_attr_gpi7.attr, @@ -238,12 +238,12 @@ static struct attribute *mt100eocg_platform_attributes[] = { // SPI &dev_attr_board_temperature.attr, // -/* adc +// adc &dev_attr_adc0.attr, &dev_attr_adc1.attr, &dev_attr_adc2.attr, &dev_attr_adc3.attr, -*/ + NULL, }; diff --git a/io-module/mts-io.c b/io-module/mts-io.c index 489f0d5..8c35f74 100644 --- a/io-module/mts-io.c +++ b/io-module/mts-io.c @@ -23,7 +23,7 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ - +#include <linux/clk.h> #include <linux/delay.h> #include <linux/ioctl.h> #include <linux/input.h> @@ -74,6 +74,11 @@ static const struct of_device_id mts_io_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, mts_io_dt_ids); +/* on-board EEPROM */ +static struct mts_id_eeprom_layout id_eeprom; + +#include "adc.c" + /* * We must call platform_set_drvdata, or else the * devres_head for the driver has junk in it, and @@ -86,7 +91,11 @@ MODULE_DEVICE_TABLE(of, mts_io_dt_ids); */ static int mts_io_probe(struct platform_device *pdev) { - return 0; + int ret = 0; + if (!DEVICE_CAPA(id_eeprom.capa, CAPA_ADC)) { + ret = mts_io_board_adc_probe(pdev); + } + return ret; } static int mts_io_remove(struct platform_device *pdev) @@ -107,8 +116,6 @@ static struct platform_driver mts_io_driver = { }; -/* on-board EEPROM */ -static struct mts_id_eeprom_layout id_eeprom; static uint8_t mts_hw_version; struct platform_device *mts_io_platform_device; EXPORT_SYMBOL(mts_io_platform_device); |