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authorPhil Edworthy <phil.edworthy@renesas.com>2012-11-22 15:37:27 +0100
committerGrant Likely <grant.likely@secretlab.ca>2012-11-23 10:52:43 +0100
commitce3293058637ada3b1837a77c8f9c672a51b2434 (patch)
treef4de2d04934ce061a4b5f460680b1aaf269ae806 /drivers/spi/spi-sh-hspi.c
parentof_spi: add generic binding support to specify cs gpio (diff)
downloadlinux-ce3293058637ada3b1837a77c8f9c672a51b2434.tar.xz
linux-ce3293058637ada3b1837a77c8f9c672a51b2434.zip
spi/sh-hspi: add CS manual control support
The current HSPI driver used automatic CS control, leading to CS active for each byte transmitted. This patch changes the driver to manual CS control, and ensures CS is active thoughout a whole message. Additionally, it uses the cs_change field to determine if CS is disabled between transfers in the message. Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to '')
-rw-r--r--drivers/spi/spi-sh-hspi.c43
1 files changed, 41 insertions, 2 deletions
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c
index 796c077ef439..47c4beee8a0e 100644
--- a/drivers/spi/spi-sh-hspi.c
+++ b/drivers/spi/spi-sh-hspi.c
@@ -68,6 +68,16 @@ static u32 hspi_read(struct hspi_priv *hspi, int reg)
return ioread32(hspi->addr + reg);
}
+static void hspi_bit_set(struct hspi_priv *hspi, int reg, u32 mask, u32 set)
+{
+ u32 val = hspi_read(hspi, reg);
+
+ val &= ~mask;
+ val |= set & mask;
+
+ hspi_write(hspi, reg, val);
+}
+
/*
* transfer function
*/
@@ -105,6 +115,13 @@ static int hspi_unprepare_transfer(struct spi_master *master)
return 0;
}
+#define hspi_hw_cs_enable(hspi) hspi_hw_cs_ctrl(hspi, 0)
+#define hspi_hw_cs_disable(hspi) hspi_hw_cs_ctrl(hspi, 1)
+static void hspi_hw_cs_ctrl(struct hspi_priv *hspi, int hi)
+{
+ hspi_bit_set(hspi, SPSCR, (1 << 6), (hi) << 6);
+}
+
static void hspi_hw_setup(struct hspi_priv *hspi,
struct spi_message *msg,
struct spi_transfer *t)
@@ -155,7 +172,7 @@ static void hspi_hw_setup(struct hspi_priv *hspi,
hspi_write(hspi, SPCR, spcr);
hspi_write(hspi, SPSR, 0x0);
- hspi_write(hspi, SPSCR, 0x1); /* master mode */
+ hspi_write(hspi, SPSCR, 0x21); /* master mode / CS control */
}
static int hspi_transfer_one_message(struct spi_master *master,
@@ -166,12 +183,21 @@ static int hspi_transfer_one_message(struct spi_master *master,
u32 tx;
u32 rx;
int ret, i;
+ unsigned int cs_change;
+ const int nsecs = 50;
dev_dbg(hspi->dev, "%s\n", __func__);
+ cs_change = 1;
ret = 0;
list_for_each_entry(t, &msg->transfers, transfer_list) {
- hspi_hw_setup(hspi, msg, t);
+
+ if (cs_change) {
+ hspi_hw_setup(hspi, msg, t);
+ hspi_hw_cs_enable(hspi);
+ ndelay(nsecs);
+ }
+ cs_change = t->cs_change;
for (i = 0; i < t->len; i++) {
@@ -198,9 +224,22 @@ static int hspi_transfer_one_message(struct spi_master *master,
}
msg->actual_length += t->len;
+
+ if (t->delay_usecs)
+ udelay(t->delay_usecs);
+
+ if (cs_change) {
+ ndelay(nsecs);
+ hspi_hw_cs_disable(hspi);
+ ndelay(nsecs);
+ }
}
msg->status = ret;
+ if (!cs_change) {
+ ndelay(nsecs);
+ hspi_hw_cs_disable(hspi);
+ }
spi_finalize_current_message(master);
return ret;