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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>
This commit is contained in:
Michael Williamson 2011-01-04 07:50:23 -05:00 committed by Kevin Hilman
parent cbb691fb89
commit 6619490a7f
1 changed files with 75 additions and 8 deletions
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83
arch/arm/mach-davinci/board-mityomapl138.c
View File

@ -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);