For the MityDSP-L138/MityARM-1808 SoMs, the speed grade can be determined from the part number string read from the factory configuration block on the on-board I2C PROM. Configure the maximum CPU speed based on this information.
Signed-off-by: Michael Williamson <[email protected]> --- This is against davinci-linux tree. Changes since v0: aligned comments using tabs not spaces. arch/arm/mach-davinci/board-mityomapl138.c | 76 +++++++++++++++++++++++++--- 1 files changed, 68 insertions(+), 8 deletions(-) diff --git a/arch/arm/mach-davinci/board-mityomapl138.c b/arch/arm/mach-davinci/board-mityomapl138.c index 0bb5f0c..06b6d2f 100644 --- a/arch/arm/mach-davinci/board-mityomapl138.c +++ b/arch/arm/mach-davinci/board-mityomapl138.c @@ -44,38 +44,102 @@ struct factory_config { static struct factory_config factory_config; +struct part_no_info { + const char *part_no; /* part number string of interest */ + int max_freq; /* khz */ +}; + +static struct part_no_info part_no_info[] = { + { + .part_no = "L138-C", + .max_freq = 300000, + }, + { + .part_no = "L138-D", + .max_freq = 375000, + }, + { + .part_no = "L138-F", + .max_freq = 456000, + }, + { + .part_no = "1808-C", + .max_freq = 300000, + }, + { + .part_no = "1808-D", + .max_freq = 375000, + }, + { + .part_no = "1808-F", + .max_freq = 456000, + }, + { + .part_no = "1810-D", + .max_freq = 375000, + }, +}; + static void read_factory_config(struct memory_accessor *a, void *context) { int ret; +#ifdef CONFIG_CPU_FREQ + int i; +#endif struct davinci_soc_info *soc_info = &davinci_soc_info; ret = a->read(a, (char *)&factory_config, 0, sizeof(factory_config)); if (ret != sizeof(struct factory_config)) { pr_warning("MityOMAPL138: Read Factory Config Failed: %d\n", ret); - return; + goto bad_config; } if (factory_config.magic != FACTORY_CONFIG_MAGIC) { pr_warning("MityOMAPL138: Factory Config Magic Wrong (%X)\n", factory_config.magic); - return; + goto bad_config; } if (factory_config.version != FACTORY_CONFIG_VERSION) { pr_warning("MityOMAPL138: Factory Config Version Wrong (%X)\n", factory_config.version); - return; + goto bad_config; } pr_info("MityOMAPL138: Found MAC = %pM\n", factory_config.mac); - pr_info("MityOMAPL138: Part Number = %s\n", factory_config.partnum); if (is_valid_ether_addr(factory_config.mac)) memcpy(soc_info->emac_pdata->mac_addr, factory_config.mac, ETH_ALEN); else pr_warning("MityOMAPL138: Invalid MAC found " "in factory config block\n"); + + pr_info("MityOMAPL138: Part Number = %s\n", factory_config.partnum); + +#ifdef CONFIG_CPU_FREQ + for (i = 0; i < ARRAY_SIZE(part_no_info); i++) { + /* + * the part number has additional characters beyond what is + * stored in the table. This information is not needed for + * determining the speed grade, and would require several + * more table entries. Only check the first N characters + * for a match. + */ + if (!strncmp(factory_config.partnum, part_no_info[i].part_no, + strlen(part_no_info[i].part_no))) { + da850_max_speed = part_no_info[i].max_freq; + break; + } + } +#endif + +bad_config: +#ifdef CONFIG_CPU_FREQ + ret = da850_register_cpufreq("pll0_sysclk3"); + if (ret) + pr_warning("cpufreq registration failed: %d\n", ret); +#endif } static struct at24_platform_data mityomapl138_fd_chip = { @@ -383,10 +447,6 @@ static void __init mityomapl138_init(void) if (ret) pr_warning("rtc setup failed: %d\n", ret); - ret = da850_register_cpufreq("pll0_sysclk3"); - if (ret) - pr_warning("cpufreq registration failed: %d\n", ret); - ret = da8xx_register_cpuidle(); if (ret) pr_warning("cpuidle registration failed: %d\n", ret); -- 1.7.0.4 _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
