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authorRusty Russell <rusty@rustcorp.com.au>2008-12-31 23:05:57 +1030
committerRusty Russell <rusty@rustcorp.com.au>2008-12-31 23:05:57 +1030
commit2ca1a615835d9f4990f42102ab1f2ef434e7e89c (patch)
tree726cf3d5f29a6c66c44e4bd68e7ebed2fd83d059 /arch/arm/mach-pxa/cpufreq-pxa2xx.c
parente12f0102ac81d660c9f801d0a0e10ccf4537a9de (diff)
parent6a94cb73064c952255336cc57731904174b2c58f (diff)
downloadlinux-2ca1a615835d9f4990f42102ab1f2ef434e7e89c.tar.bz2
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts: arch/x86/kernel/io_apic.c
Diffstat (limited to 'arch/arm/mach-pxa/cpufreq-pxa2xx.c')
-rw-r--r--arch/arm/mach-pxa/cpufreq-pxa2xx.c57
1 files changed, 41 insertions, 16 deletions
diff --git a/arch/arm/mach-pxa/cpufreq-pxa2xx.c b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
index 1f272ea83f36..771dd4eac935 100644
--- a/arch/arm/mach-pxa/cpufreq-pxa2xx.c
+++ b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
@@ -64,7 +64,7 @@ typedef struct {
/* Define the refresh period in mSec for the SDRAM and the number of rows */
#define SDRAM_TREF 64 /* standard 64ms SDRAM */
-#define SDRAM_ROWS 4096 /* 64MB=8192 32MB=4096 */
+static unsigned int sdram_rows;
#define CCLKCFG_TURBO 0x1
#define CCLKCFG_FCS 0x2
@@ -73,6 +73,9 @@ typedef struct {
#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
#define MDREFR_DRI_MASK 0xFFF
+#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3)
+#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3)
+
/*
* PXA255 definitions
*/
@@ -109,6 +112,10 @@ static struct cpufreq_frequency_table
static struct cpufreq_frequency_table
pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
+static unsigned int pxa255_turbo_table;
+module_param(pxa255_turbo_table, uint, 0);
+MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
+
/*
* PXA270 definitions
*
@@ -158,22 +165,16 @@ static struct cpufreq_frequency_table
extern unsigned get_clk_frequency_khz(int info);
-static void find_freq_tables(struct cpufreq_policy *policy,
- struct cpufreq_frequency_table **freq_table,
+static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
pxa_freqs_t **pxa_freqs)
{
if (cpu_is_pxa25x()) {
- if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
+ if (!pxa255_turbo_table) {
*pxa_freqs = pxa255_run_freqs;
*freq_table = pxa255_run_freq_table;
- } else if (policy->policy == CPUFREQ_POLICY_POWERSAVE) {
+ } else {
*pxa_freqs = pxa255_turbo_freqs;
*freq_table = pxa255_turbo_freq_table;
- } else {
- printk("CPU PXA: Unknown policy found. "
- "Using CPUFREQ_POLICY_PERFORMANCE\n");
- *pxa_freqs = pxa255_run_freqs;
- *freq_table = pxa255_run_freq_table;
}
}
if (cpu_is_pxa27x()) {
@@ -194,14 +195,28 @@ static void pxa27x_guess_max_freq(void)
}
}
+static void init_sdram_rows(void)
+{
+ uint32_t mdcnfg = MDCNFG;
+ unsigned int drac2 = 0, drac0 = 0;
+
+ if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3))
+ drac2 = MDCNFG_DRAC2(mdcnfg);
+
+ if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
+ drac0 = MDCNFG_DRAC0(mdcnfg);
+
+ sdram_rows = 1 << (11 + max(drac0, drac2));
+}
+
static u32 mdrefr_dri(unsigned int freq)
{
u32 dri = 0;
if (cpu_is_pxa25x())
- dri = ((freq * SDRAM_TREF) / (SDRAM_ROWS * 32));
+ dri = ((freq * SDRAM_TREF) / (sdram_rows * 32));
if (cpu_is_pxa27x())
- dri = ((freq * SDRAM_TREF) / (SDRAM_ROWS - 31)) / 32;
+ dri = ((freq * SDRAM_TREF) / (sdram_rows - 31)) / 32;
return dri;
}
@@ -212,7 +227,7 @@ static int pxa_verify_policy(struct cpufreq_policy *policy)
pxa_freqs_t *pxa_freqs;
int ret;
- find_freq_tables(policy, &pxa_freqs_table, &pxa_freqs);
+ find_freq_tables(&pxa_freqs_table, &pxa_freqs);
ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table);
if (freq_debug)
@@ -240,7 +255,7 @@ static int pxa_set_target(struct cpufreq_policy *policy,
unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
/* Get the current policy */
- find_freq_tables(policy, &pxa_freqs_table, &pxa_freq_settings);
+ find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
/* Lookup the next frequency */
if (cpufreq_frequency_table_target(policy, pxa_freqs_table,
@@ -329,11 +344,15 @@ static __init int pxa_cpufreq_init(struct cpufreq_policy *policy)
{
int i;
unsigned int freq;
+ struct cpufreq_frequency_table *pxa255_freq_table;
+ pxa_freqs_t *pxa255_freqs;
/* try to guess pxa27x cpu */
if (cpu_is_pxa27x())
pxa27x_guess_max_freq();
+ init_sdram_rows();
+
/* set default policy and cpuinfo */
policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
policy->cur = get_clk_frequency_khz(0); /* current freq */
@@ -354,6 +373,8 @@ static __init int pxa_cpufreq_init(struct cpufreq_policy *policy)
}
pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
+ pxa255_turbo_table = !!pxa255_turbo_table;
+
/* Generate the pxa27x cpufreq_frequency_table struct */
for (i = 0; i < NUM_PXA27x_FREQS; i++) {
freq = pxa27x_freqs[i].khz;
@@ -368,8 +389,12 @@ static __init int pxa_cpufreq_init(struct cpufreq_policy *policy)
* Set the policy's minimum and maximum frequencies from the tables
* just constructed. This sets cpuinfo.mxx_freq, min and max.
*/
- if (cpu_is_pxa25x())
- cpufreq_frequency_table_cpuinfo(policy, pxa255_run_freq_table);
+ if (cpu_is_pxa25x()) {
+ find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
+ pr_info("PXA255 cpufreq using %s frequency table\n",
+ pxa255_turbo_table ? "turbo" : "run");
+ cpufreq_frequency_table_cpuinfo(policy, pxa255_freq_table);
+ }
else if (cpu_is_pxa27x())
cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table);