diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/i2c-mpc.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index c74cc2be613b..dc03a9164772 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" @@ -346,6 +347,33 @@ 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 +391,7 @@ 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; |