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path: root/drivers/i2c/busses/i2c-mpc.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-mpc.c')
-rw-r--r--drivers/i2c/busses/i2c-mpc.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index c74cc2be613b..48ecffecc0ed 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -29,6 +29,7 @@
#include <linux/delay.h>
#include <asm/mpc52xx.h>
+#include <asm/mpc85xx.h>
#include <sysdev/fsl_soc.h>
#define DRV_NAME "mpc-i2c"
@@ -95,8 +96,9 @@ static irqreturn_t mpc_i2c_isr(int irq, void *dev_id)
i2c->interrupt = readb(i2c->base + MPC_I2C_SR);
writeb(0, i2c->base + MPC_I2C_SR);
wake_up(&i2c->queue);
+ return IRQ_HANDLED;
}
- return IRQ_HANDLED;
+ return IRQ_NONE;
}
/* Sometimes 9th clock pulse isn't generated, and slave doesn't release
@@ -346,6 +348,33 @@ static u32 mpc_i2c_get_sec_cfg_8xxx(void)
return val;
}
+static u32 mpc_i2c_get_prescaler_8xxx(void)
+{
+ /* mpc83xx and mpc82xx all have prescaler 1 */
+ u32 prescaler = 1;
+
+ /* mpc85xx */
+ if (pvr_version_is(PVR_VER_E500V1) || pvr_version_is(PVR_VER_E500V2)
+ || pvr_version_is(PVR_VER_E500MC)
+ || pvr_version_is(PVR_VER_E5500)
+ || pvr_version_is(PVR_VER_E6500)) {
+ unsigned int svr = mfspr(SPRN_SVR);
+
+ if ((SVR_SOC_VER(svr) == SVR_8540)
+ || (SVR_SOC_VER(svr) == SVR_8541)
+ || (SVR_SOC_VER(svr) == SVR_8560)
+ || (SVR_SOC_VER(svr) == SVR_8555)
+ || (SVR_SOC_VER(svr) == SVR_8610))
+ /* the above 85xx SoCs have prescaler 1 */
+ prescaler = 1;
+ else
+ /* all the other 85xx have prescaler 2 */
+ prescaler = 2;
+ }
+
+ return prescaler;
+}
+
static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
u32 prescaler, u32 *real_clk)
{
@@ -363,7 +392,7 @@ static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
if (!prescaler)
- prescaler = 1;
+ prescaler = mpc_i2c_get_prescaler_8xxx();
divider = fsl_get_sys_freq() / clock / prescaler;