Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-10 23:24:38 +00:00
Code Issues Projects Releases Packages Wiki Activity

Add I2C frequency dividers for ColdFire

Browse source 
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>
Acked-by: Tabi Timur <timur@freescale.com>
This commit is contained in:
TsiChung Liew 2008-08-19 00:56:46 +06:00 committed by John Rigby
parent eec567a67e
commit 5d9a5efa4b
1 changed files with 33 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
drivers/i2c/fsl_i2c.c
View file

@ -76,12 +76,20 @@ 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},
@ -98,6 +106,25 @@ 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
};
/**
@ -126,12 +153,17 @@ 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;
}