i2c: at91: add support for digital filtering
Add new platform data support for digital filtering for i2c. The sama5d4, sama5d2 and sam9x60 support this feature. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -68,6 +68,7 @@ static struct at91_twi_pdata at91rm9200_config = {
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.has_unre_flag = true,
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.has_alt_cmd = false,
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.has_hold_field = false,
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.has_dig_filtr = false,
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};
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static struct at91_twi_pdata at91sam9261_config = {
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@ -76,6 +77,7 @@ static struct at91_twi_pdata at91sam9261_config = {
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.has_unre_flag = false,
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.has_alt_cmd = false,
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.has_hold_field = false,
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.has_dig_filtr = false,
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};
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static struct at91_twi_pdata at91sam9260_config = {
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@ -84,6 +86,7 @@ static struct at91_twi_pdata at91sam9260_config = {
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.has_unre_flag = false,
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.has_alt_cmd = false,
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.has_hold_field = false,
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.has_dig_filtr = false,
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};
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static struct at91_twi_pdata at91sam9g20_config = {
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@ -92,6 +95,7 @@ static struct at91_twi_pdata at91sam9g20_config = {
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.has_unre_flag = false,
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.has_alt_cmd = false,
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.has_hold_field = false,
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.has_dig_filtr = false,
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};
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static struct at91_twi_pdata at91sam9g10_config = {
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@ -100,6 +104,7 @@ static struct at91_twi_pdata at91sam9g10_config = {
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.has_unre_flag = false,
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.has_alt_cmd = false,
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.has_hold_field = false,
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.has_dig_filtr = false,
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};
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static const struct platform_device_id at91_twi_devtypes[] = {
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@ -130,6 +135,7 @@ static struct at91_twi_pdata at91sam9x5_config = {
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.has_unre_flag = false,
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.has_alt_cmd = false,
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.has_hold_field = false,
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.has_dig_filtr = false,
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};
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static struct at91_twi_pdata sama5d4_config = {
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@ -138,6 +144,7 @@ static struct at91_twi_pdata sama5d4_config = {
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.has_unre_flag = false,
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.has_alt_cmd = false,
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.has_hold_field = true,
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.has_dig_filtr = true,
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};
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static struct at91_twi_pdata sama5d2_config = {
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@ -146,6 +153,7 @@ static struct at91_twi_pdata sama5d2_config = {
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.has_unre_flag = true,
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.has_alt_cmd = true,
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.has_hold_field = true,
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.has_dig_filtr = true,
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};
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static struct at91_twi_pdata sam9x60_config = {
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@ -154,6 +162,7 @@ static struct at91_twi_pdata sam9x60_config = {
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.has_unre_flag = true,
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.has_alt_cmd = true,
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.has_hold_field = true,
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.has_dig_filtr = true,
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};
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static const struct of_device_id atmel_twi_dt_ids[] = {
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@ -31,12 +31,18 @@
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void at91_init_twi_bus_master(struct at91_twi_dev *dev)
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{
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struct at91_twi_pdata *pdata = dev->pdata;
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/* FIFO should be enabled immediately after the software reset */
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if (dev->fifo_size)
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at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_FIFOEN);
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at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_MSEN);
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at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SVDIS);
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at91_twi_write(dev, AT91_TWI_CWGR, dev->twi_cwgr_reg);
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/* enable digital filter */
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if (pdata->has_dig_filtr && dev->enable_dig_filt)
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at91_twi_write(dev, AT91_TWI_FILTR, AT91_TWI_FILTR_FILT);
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}
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/*
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@ -793,6 +799,9 @@ int at91_twi_probe_master(struct platform_device *pdev,
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dev_info(dev->dev, "Using FIFO (%u data)\n", dev->fifo_size);
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}
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dev->enable_dig_filt = of_property_read_bool(pdev->dev.of_node,
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"i2c-digital-filter");
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at91_calc_twi_clock(dev);
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dev->adapter.algo = &at91_twi_algorithm;
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@ -84,6 +84,9 @@
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#define AT91_TWI_ACR_DATAL(len) ((len) & 0xff)
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#define AT91_TWI_ACR_DIR BIT(8)
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#define AT91_TWI_FILTR 0x0044
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#define AT91_TWI_FILTR_FILT BIT(0)
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#define AT91_TWI_FMR 0x0050 /* FIFO Mode Register */
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#define AT91_TWI_FMR_TXRDYM(mode) (((mode) & 0x3) << 0)
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#define AT91_TWI_FMR_TXRDYM_MASK (0x3 << 0)
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@ -108,6 +111,7 @@ struct at91_twi_pdata {
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bool has_unre_flag;
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bool has_alt_cmd;
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bool has_hold_field;
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bool has_dig_filtr;
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struct at_dma_slave dma_slave;
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};
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@ -145,6 +149,7 @@ struct at91_twi_dev {
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unsigned smr;
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struct i2c_client *slave;
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#endif
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bool enable_dig_filt;
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};
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unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg);
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