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author | Michael Williamson <michael.williamson@criticallink.com> | 2011-01-04 07:50:23 -0500 |
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committer | Kevin Hilman <khilman@ti.com> | 2011-02-28 14:53:28 -0800 |
commit | 6619490a7f8c3e38406bfc03c755367fec21372d (patch) | |
tree | 4912e6cb97b0e405b8ab5991e03c507b962522e0 /arch/arm/mach-davinci | |
parent | cbb691fb89ae01fde4ccce3b7351a0fa9fe1a47b (diff) | |
download | blackbird-op-linux-6619490a7f8c3e38406bfc03c755367fec21372d.tar.gz blackbird-op-linux-6619490a7f8c3e38406bfc03c755367fec21372d.zip |
davinci: Support various speedgrades for MityDSP-L138 and MityARM-1808 SoMs
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.
This patch was tested using a MityDSP-L138 and MityARM-1808 at various
speedgrades. Also, for code coverage, a bogus configuration was tested
as well as a configuration having an unknown part number.
Signed-off-by: Michael Williamson <michael.williamson@criticallink.com>
Tested-by: Michael Williamson <michael.williamson@criticallink.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-davinci')
-rw-r--r-- | arch/arm/mach-davinci/board-mityomapl138.c | 83 |
1 files changed, 75 insertions, 8 deletions
diff --git a/arch/arm/mach-davinci/board-mityomapl138.c b/arch/arm/mach-davinci/board-mityomapl138.c index 0bb5f0ce4fdc..0ea59327dc28 100644 --- a/arch/arm/mach-davinci/board-mityomapl138.c +++ b/arch/arm/mach-davinci/board-mityomapl138.c @@ -44,38 +44,109 @@ 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 mityomapl138_pn_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, + }, +}; + +#ifdef CONFIG_CPU_FREQ +static void mityomapl138_cpufreq_init(const char *partnum) +{ + int i, ret; + + for (i = 0; partnum && i < ARRAY_SIZE(mityomapl138_pn_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(partnum, mityomapl138_pn_info[i].part_no, + strlen(mityomapl138_pn_info[i].part_no))) { + da850_max_speed = mityomapl138_pn_info[i].max_freq; + break; + } + } + + ret = da850_register_cpufreq("pll0_sysclk3"); + if (ret) + pr_warning("cpufreq registration failed: %d\n", ret); +} +#else +static void mityomapl138_cpufreq_init(const char *partnum) { } +#endif + static void read_factory_config(struct memory_accessor *a, void *context) { int ret; + const char *partnum = NULL; 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"); + + partnum = factory_config.partnum; + pr_info("MityOMAPL138: Part Number = %s\n", partnum); + +bad_config: + /* default maximum speed is valid for all platforms */ + mityomapl138_cpufreq_init(partnum); } static struct at24_platform_data mityomapl138_fd_chip = { @@ -383,10 +454,6 @@ 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); |