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authorJohn Crispin <john@openwrt.org>2015-11-22 11:48:51 +0000
committerJohn Crispin <john@openwrt.org>2015-11-22 11:48:51 +0000
commita58dec627598ecae1767321a752c0a88c04fdce7 (patch)
tree8f7b660f3a50f3498e839042b1de560b38158395 /target/linux/ramips
parent2ce886f1492fa7a4d335d55dcfc622f600da279c (diff)
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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.patch73
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;
+}
+