From: TsiChung Liew Tsi-Chung.Liew@freescale.com
The existing I2C freqency dividers for FDR does not apply to ColdFire platforms; thus, a seperate table is added based on MCF5xxx Reference Manual
Signed-off-by: Luigi 'Comio' Mantellini luigi.mantellini@idf-hit.com Signed-off-by: TsiChung Liew Tsi-Chung.Liew@freescale.com --- drivers/i2c/fsl_i2c.c | 34 +++++++++++++++++++++++++++++++++- 1 files changed, 33 insertions(+), 1 deletions(-)
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 3f78e2f..bbdfc33 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -77,12 +77,20 @@ static const struct fsl_i2c *i2c_dev[2] = { * For this table, the values are based on a value of 1 for the DFSR * register. See the application note AN2919 "Determining the I2C Frequency * Divider Ratio for SCL" + * + * ColdFire I2C frequency dividers for FDR values are different from + * PowerPC. The protocol to use the I2C module is still the same. + * A different table is defined and are based on MCF5xxx user manual. + * */ static const struct { unsigned short divider; +#ifdef __PPC__ u8 dfsr; +#endif u8 fdr; } fsl_i2c_speed_map[] = { +#ifdef __PPC__ {160, 1, 32}, {192, 1, 33}, {224, 1, 34}, {256, 1, 35}, {288, 1, 0}, {320, 1, 1}, {352, 6, 1}, {384, 1, 2}, {416, 6, 2}, {448, 1, 38}, {480, 1, 3}, {512, 1, 39}, {544, 11, 3}, {576, 1, 4}, @@ -99,6 +107,25 @@ static const struct { {20480, 1, 25}, {24576, 1, 26}, {28672, 1, 62}, {30720, 1, 27}, {32768, 1, 63}, {36864, 1, 28}, {40960, 1, 29}, {49152, 1, 30}, {61440, 1, 31}, {-1, 1, 31} +#elif defined(__M68K__) + {20, 32}, {22, 33}, {24, 34}, {26, 35}, + {28, 0}, {28, 36}, {30, 1}, {32, 37}, + {34, 2}, {36, 38}, {40, 3}, {40, 39}, + {44, 4}, {48, 5}, {48, 40}, {56, 6}, + {56, 41}, {64, 42}, {68, 7}, {72, 43}, + {80, 8}, {80, 44}, {88, 9}, {96, 41}, + {104, 10}, {112, 42}, {128, 11}, {128, 43}, + {144, 12}, {160, 13}, {160, 48}, {192, 14}, + {192, 49}, {224, 50}, {240, 15}, {256, 51}, + {288, 16}, {320, 17}, {320, 52}, {384, 18}, + {384, 53}, {448, 54}, {480, 19}, {512, 55}, + {576, 20}, {640, 21}, {640, 56}, {768, 22}, + {768, 57}, {960, 23}, {896, 58}, {1024, 59}, + {1152, 24}, {1280, 25}, {1280, 60}, {1536, 26}, + {1536, 61}, {1792, 62}, {1920, 27}, {2048, 63}, + {2304, 28}, {2560, 29}, {3072, 30}, {3840, 31}, + {-1, 31} +#endif };
/** @@ -127,12 +154,17 @@ static unsigned int set_i2c_bus_speed(const struct fsl_i2c *dev,
for (i = 0; i < ARRAY_SIZE(fsl_i2c_speed_map); i++) if (fsl_i2c_speed_map[i].divider >= divider) { - u8 fdr, dfsr; + u8 fdr; +#ifdef __PPC__ + u8 dfsr; dfsr = fsl_i2c_speed_map[i].dfsr; +#endif fdr = fsl_i2c_speed_map[i].fdr; speed = i2c_clk / fsl_i2c_speed_map[i].divider; writeb(fdr, &dev->fdr); /* set bus speed */ +#ifdef __PPC__ writeb(dfsr, &dev->dfsrr); /* set default filter */ +#endif break; }