diff options
| -rw-r--r-- | cpu/mpc85xx/speed.c | 31 | ||||
| -rw-r--r-- | include/asm-ppc/immap_85xx.h | 4 |
2 files changed, 33 insertions, 2 deletions
diff --git a/cpu/mpc85xx/speed.c b/cpu/mpc85xx/speed.c index d90d397..699441b4 100644 --- a/cpu/mpc85xx/speed.c +++ b/cpu/mpc85xx/speed.c @@ -65,6 +65,9 @@ void get_sys_info (sys_info_t * sysInfo) int get_clocks (void) { sys_info_t sys_info; +#ifdef CONFIG_MPC8544 + volatile ccsr_gur_t *gur = (void *) CFG_MPC85xx_GUTS_ADDR; +#endif #if defined(CONFIG_CPM2) volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CFG_MPC85xx_CPM_ADDR; uint sccr, dfbrg; @@ -78,8 +81,34 @@ int get_clocks (void) gd->cpu_clk = sys_info.freqProcessor; gd->bus_clk = sys_info.freqSystemBus; gd->mem_clk = sys_info.freqDDRBus; + + /* + * The base clock for I2C depends on the actual SOC. Unfortunately, + * there is no pattern that can be used to determine the frequency, so + * the only choice is to look up the actual SOC number and use the value + * for that SOC. This information is taken from application note + * AN2919. + */ +#if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \ + defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555) gd->i2c1_clk = sys_info.freqSystemBus; - gd->i2c2_clk = sys_info.freqSystemBus; +#elif defined(CONFIG_MPC8544) + /* + * On the 8544, the I2C clock is the same as the SEC clock. This can be + * either CCB/2 or CCB/3, depending on the value of cfg_sec_freq. See + * 4.4.3.3 of the 8544 RM. Note that this might actually work for all + * 85xx, but only the 8544 has cfg_sec_freq, so it's unknown if the + * PORDEVSR2_SEC_CFG bit is 0 on all 85xx boards that are not an 8544. + */ + if (gur->pordevsr2 & MPC85xx_PORDEVSR2_SEC_CFG) + gd->i2c1_clk = sys_info.freqSystemBus / 3; + else + gd->i2c1_clk = sys_info.freqSystemBus / 2; +#else + /* Most 85xx SOCs use CCB/2, so this is the default behavior. */ + gd->i2c1_clk = sys_info.freqSystemBus / 2; +#endif + gd->i2c2_clk = gd->i2c1_clk; #if defined(CONFIG_CPM2) gd->vco_out = 2*sys_info.freqSystemBus; diff --git a/include/asm-ppc/immap_85xx.h b/include/asm-ppc/immap_85xx.h index 01cb2d7..dc6e278 100644 --- a/include/asm-ppc/immap_85xx.h +++ b/include/asm-ppc/immap_85xx.h @@ -1570,7 +1570,9 @@ typedef struct ccsr_gur { #define MPC85xx_PORDEVSR_RIO_CTLS 0x00000008 #define MPC85xx_PORDEVSR_RIO_DEV_ID 0x00000007 uint pordbgmsr; /* 0xe0010 - POR debug mode status register */ - char res1[12]; + uint pordevsr2; /* 0xe0014 - POR I/O device status regsiter 2 */ +#define MPC85xx_PORDEVSR2_SEC_CFG 0x00000020 + char res1[8]; uint gpporcr; /* 0xe0020 - General-purpose POR configuration register */ char res2[12]; uint gpiocr; /* 0xe0030 - GPIO control register */ |