diff options
| author | John Crispin <john@openwrt.org> | 2015-11-22 11:48:51 +0000 |
|---|---|---|
| committer | John Crispin <john@openwrt.org> | 2015-11-22 11:48:51 +0000 |
| commit | a58dec627598ecae1767321a752c0a88c04fdce7 (patch) | |
| tree | 8f7b660f3a50f3498e839042b1de560b38158395 /target/linux/ramips | |
| parent | 2ce886f1492fa7a4d335d55dcfc622f600da279c (diff) | |
| download | upstream-a58dec627598ecae1767321a752c0a88c04fdce7.tar.gz upstream-a58dec627598ecae1767321a752c0a88c04fdce7.tar.bz2 upstream-a58dec627598ecae1767321a752c0a88c04fdce7.zip | |
ramips: improve rt2880 spi setup
* check clock rate, SPI mode, and word sizes
* setup spi polarity
* enable spi1 hw if need
Signed-off-by: Michael Lee <igvtee@gmail.com>
SVN-Revision: 47577
Diffstat (limited to 'target/linux/ramips')
| -rw-r--r-- | target/linux/ramips/patches-3.18/0050-SPI-ralink-add-Ralink-SoC-spi-driver.patch | 73 |
1 files changed, 62 insertions, 11 deletions
diff --git a/target/linux/ramips/patches-3.18/0050-SPI-ralink-add-Ralink-SoC-spi-driver.patch b/target/linux/ramips/patches-3.18/0050-SPI-ralink-add-Ralink-SoC-spi-driver.patch index 605bda92e1..418a094161 100644 --- a/target/linux/ramips/patches-3.18/0050-SPI-ralink-add-Ralink-SoC-spi-driver.patch +++ b/target/linux/ramips/patches-3.18/0050-SPI-ralink-add-Ralink-SoC-spi-driver.patch @@ -41,7 +41,7 @@ Acked-by: John Crispin <blogic@openwrt.org> spi-s3c24xx-hw-$(CONFIG_SPI_S3C24XX_FIQ) += spi-s3c24xx-fiq.o --- /dev/null +++ b/drivers/spi/spi-rt2880.c -@@ -0,0 +1,488 @@ +@@ -0,0 +1,539 @@ +/* + * spi-rt2880.c -- Ralink RT288x/RT305x SPI controller driver + * @@ -175,6 +175,7 @@ Acked-by: John Crispin <blogic@openwrt.org> + unsigned int sys_freq; + unsigned int speed; + u16 wait_loops; ++ u16 mode; + struct clk *clk; +}; + @@ -265,6 +266,17 @@ Acked-by: John Crispin <blogic@openwrt.org> + return 0; +} + ++static u32 get_arbiter_offset(struct spi_master *master) ++{ ++ u32 offset; ++ ++ offset = RAMIPS_SPI_ARBITER; ++ if (master->bus_num == 1) ++ offset -= RAMIPS_SPI_DEV_OFFSET; ++ ++ return offset; ++} ++ +static void rt2880_spi_set_cs(struct rt2880_spi *rs, int enable) +{ + if (enable) @@ -396,21 +408,60 @@ Acked-by: John Crispin <blogic@openwrt.org> + +static int rt2880_spi_setup(struct spi_device *spi) +{ -+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi); ++ struct spi_master *master = spi->master; ++ struct rt2880_spi *rs = spi_master_get_devdata(master); ++ u32 reg, old_reg, arbit_off; + -+ if ((spi->max_speed_hz == 0) || -+ (spi->max_speed_hz > (rs->sys_freq / 2))) -+ spi->max_speed_hz = (rs->sys_freq / 2); ++ if ((spi->max_speed_hz > master->max_speed_hz) || ++ (spi->max_speed_hz < master->min_speed_hz)) { ++ dev_err(&spi->dev, "invalide requested speed %d Hz\n", ++ spi->max_speed_hz); ++ return -EINVAL; ++ } + -+ if (spi->max_speed_hz < (rs->sys_freq / 128)) { -+ dev_err(&spi->dev, "setup: requested speed is too low %d Hz\n", -+ spi->max_speed_hz); ++ if (!(master->bits_per_word_mask & ++ BIT(spi->bits_per_word - 1))) { ++ dev_err(&spi->dev, "invalide bits_per_word %d\n", ++ spi->bits_per_word); + return -EINVAL; + } + -+ /* -+ * baudrate & width will be set rt2880_spi_setup_transfer -+ */ ++ /* the hardware seems can't work on mode0 force it to mode3 */ ++ if ((spi->mode & (SPI_CPOL | SPI_CPHA)) == SPI_MODE_0) { ++ dev_warn(&spi->dev, "force spi mode3\n"); ++ spi->mode |= SPI_MODE_3; ++ } ++ ++ /* chip polarity */ ++ arbit_off = get_arbiter_offset(master); ++ reg = old_reg = rt2880_spi_read(rs, arbit_off); ++ if (spi->mode & SPI_CS_HIGH) { ++ switch (master->bus_num) { ++ case 1: ++ reg |= SPI1_POR; ++ break; ++ default: ++ reg |= SPI0_POR; ++ break; ++ } ++ } else { ++ switch (master->bus_num) { ++ case 1: ++ reg &= ~SPI1_POR; ++ break; ++ default: ++ reg &= ~SPI0_POR; ++ break; ++ } ++ } ++ ++ /* enable spi1 */ ++ if (master->bus_num == 1) ++ reg |= SPICTL_ARB_EN; ++ ++ if (reg != old_reg) ++ rt2880_spi_write(rs, arbit_off, reg); ++ + return 0; +} + |