summaryrefslogtreecommitdiffstats
path: root/drivers/i2c
diff options
context:
space:
mode:
authorWolfgang Grandegger <wg@grandegger.com>2009-04-09 11:59:52 +0200
committerBen Dooks <ben-linux@fluff.org>2009-05-12 00:35:56 +0100
commit1904b03430ade1cd621bb8b6ca8e38819a2f9267 (patch)
treeb1ab85ad3b61f2fa2f1b150ab4f74de1f8895cbf /drivers/i2c
parentd10db3a07e38bfb1bff92c790072d85b0bcc07eb (diff)
downloadop-kernel-dev-1904b03430ade1cd621bb8b6ca8e38819a2f9267.zip
op-kernel-dev-1904b03430ade1cd621bb8b6ca8e38819a2f9267.tar.gz
i2c-mpc: bug fix for MPC52xx clock setting and printout
The clock setting did not work for the MPC52xx due to a stupid bug. Furthermore, the dev info output "clock=0" for old device trees was misleading. This patch fixes both issues. Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-mpc.c34
1 files changed, 20 insertions, 14 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 4af5c09..dd778d7 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -164,7 +164,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
return 0;
}
-#ifdef CONFIG_PPC_52xx
+#ifdef CONFIG_PPC_MPC52xx
static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
@@ -188,7 +188,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
{
- const struct mpc52xx_i2c_divider *div = NULL;
+ const struct mpc_i2c_divider *div = NULL;
unsigned int pvr = mfspr(SPRN_PVR);
u32 divider;
int i;
@@ -203,7 +203,7 @@ int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
* We want to choose an FDR/DFSR that generates an I2C bus speed that
* is equal to or lower than the requested speed.
*/
- for (i = 0; i < ARRAY_SIZE(mpc52xx_i2c_dividers); i++) {
+ for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_52xx); i++) {
div = &mpc_i2c_dividers_52xx[i];
/* Old MPC5200 rev A CPUs do not support the high bits */
if (div->fdr & 0xc0 && pvr == 0x80822011)
@@ -219,20 +219,23 @@ static void mpc_i2c_setclock_52xx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
- int fdr = mpc52xx_i2c_get_fdr(node, clock, prescaler);
+ int ret, fdr;
+
+ ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
+ fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
- if (fdr < 0)
- fdr = 0x3f; /* backward compatibility */
writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
- dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
+
+ if (ret >= 0)
+ dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
}
-#else /* !CONFIG_PPC_52xx */
+#else /* !CONFIG_PPC_MPC52xx */
static void mpc_i2c_setclock_52xx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
}
-#endif /* CONFIG_PPC_52xx*/
+#endif /* CONFIG_PPC_MPC52xx*/
#ifdef CONFIG_FSL_SOC
static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
@@ -321,14 +324,17 @@ static void mpc_i2c_setclock_8xxx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
- int fdr = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
+ int ret, fdr;
+
+ ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
+ fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
- if (fdr < 0)
- fdr = 0x1031; /* backward compatibility */
writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
- dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
- clock, fdr >> 8, fdr & 0xff);
+
+ if (ret >= 0)
+ dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
+ clock, fdr >> 8, fdr & 0xff);
}
#else /* !CONFIG_FSL_SOC */
OpenPOWER on IntegriCloud