summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-pxa/cpu-pxa.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-pxa/cpu-pxa.c')
-rw-r--r--arch/arm/mach-pxa/cpu-pxa.c266
1 files changed, 186 insertions, 80 deletions
diff --git a/arch/arm/mach-pxa/cpu-pxa.c b/arch/arm/mach-pxa/cpu-pxa.c
index 0f5660200bf..fb9ba1ab282 100644
--- a/arch/arm/mach-pxa/cpu-pxa.c
+++ b/arch/arm/mach-pxa/cpu-pxa.c
@@ -49,76 +49,170 @@ MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
#define freq_debug 0
#endif
+static unsigned int pxa27x_maxfreq;
+module_param(pxa27x_maxfreq, uint, 0);
+MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
+ "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");
+
typedef struct {
unsigned int khz;
unsigned int membus;
unsigned int cccr;
unsigned int div2;
+ unsigned int cclkcfg;
} pxa_freqs_t;
/* 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 */
-#define MDREFR_DRI(x) (((x) * SDRAM_TREF) / (SDRAM_ROWS * 32))
#define CCLKCFG_TURBO 0x1
#define CCLKCFG_FCS 0x2
-#define PXA25x_MIN_FREQ 99500
-#define PXA25x_MAX_FREQ 398100
+#define CCLKCFG_HALFTURBO 0x4
+#define CCLKCFG_FASTBUS 0x8
#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
#define MDREFR_DRI_MASK 0xFFF
-
+/*
+ * PXA255 definitions
+ */
/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */
+#define CCLKCFG CCLKCFG_TURBO | CCLKCFG_FCS
+
static pxa_freqs_t pxa255_run_freqs[] =
{
- /* CPU MEMBUS CCCR DIV2 run turbo PXbus SDRAM */
- { 99500, 99500, 0x121, 1}, /* 99, 99, 50, 50 */
- {132700, 132700, 0x123, 1}, /* 133, 133, 66, 66 */
- {199100, 99500, 0x141, 0}, /* 199, 199, 99, 99 */
- {265400, 132700, 0x143, 1}, /* 265, 265, 133, 66 */
- {331800, 165900, 0x145, 1}, /* 331, 331, 166, 83 */
- {398100, 99500, 0x161, 0}, /* 398, 398, 196, 99 */
- {0,}
+ /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
+ { 99500, 99500, 0x121, 1, CCLKCFG}, /* 99, 99, 50, 50 */
+ {132700, 132700, 0x123, 1, CCLKCFG}, /* 133, 133, 66, 66 */
+ {199100, 99500, 0x141, 0, CCLKCFG}, /* 199, 199, 99, 99 */
+ {265400, 132700, 0x143, 1, CCLKCFG}, /* 265, 265, 133, 66 */
+ {331800, 165900, 0x145, 1, CCLKCFG}, /* 331, 331, 166, 83 */
+ {398100, 99500, 0x161, 0, CCLKCFG}, /* 398, 398, 196, 99 */
};
-#define NUM_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
-
-static struct cpufreq_frequency_table pxa255_run_freq_table[NUM_RUN_FREQS+1];
/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
static pxa_freqs_t pxa255_turbo_freqs[] =
{
- /* CPU MEMBUS CCCR DIV2 run turbo PXbus SDRAM */
- { 99500, 99500, 0x121, 1}, /* 99, 99, 50, 50 */
- {199100, 99500, 0x221, 0}, /* 99, 199, 50, 99 */
- {298500, 99500, 0x321, 0}, /* 99, 287, 50, 99 */
- {298600, 99500, 0x1c1, 0}, /* 199, 287, 99, 99 */
- {398100, 99500, 0x241, 0}, /* 199, 398, 99, 99 */
- {0,}
+ /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
+ { 99500, 99500, 0x121, 1, CCLKCFG}, /* 99, 99, 50, 50 */
+ {199100, 99500, 0x221, 0, CCLKCFG}, /* 99, 199, 50, 99 */
+ {298500, 99500, 0x321, 0, CCLKCFG}, /* 99, 287, 50, 99 */
+ {298600, 99500, 0x1c1, 0, CCLKCFG}, /* 199, 287, 99, 99 */
+ {398100, 99500, 0x241, 0, CCLKCFG}, /* 199, 398, 99, 99 */
};
-#define NUM_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
+#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
+#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
+
+static struct cpufreq_frequency_table
+ pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
static struct cpufreq_frequency_table
- pxa255_turbo_freq_table[NUM_TURBO_FREQS+1];
+ pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
+
+/*
+ * PXA270 definitions
+ *
+ * For the PXA27x:
+ * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG.
+ *
+ * A = 0 => memory controller clock from table 3-7,
+ * A = 1 => memory controller clock = system bus clock
+ * Run mode frequency = 13 MHz * L
+ * Turbo mode frequency = 13 MHz * L * N
+ * System bus frequency = 13 MHz * L / (B + 1)
+ *
+ * In CCCR:
+ * A = 1
+ * L = 16 oscillator to run mode ratio
+ * 2N = 6 2 * (turbo mode to run mode ratio)
+ *
+ * In CCLKCFG:
+ * B = 1 Fast bus mode
+ * HT = 0 Half-Turbo mode
+ * T = 1 Turbo mode
+ *
+ * For now, just support some of the combinations in table 3-7 of
+ * PXA27x Processor Family Developer's Manual to simplify frequency
+ * change sequences.
+ */
+#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L)
+#define CCLKCFG2(B, HT, T) \
+ (CCLKCFG_FCS | \
+ ((B) ? CCLKCFG_FASTBUS : 0) | \
+ ((HT) ? CCLKCFG_HALFTURBO : 0) | \
+ ((T) ? CCLKCFG_TURBO : 0))
+
+static pxa_freqs_t pxa27x_freqs[] = {
+ {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1)},
+ {156000, 104000, PXA27x_CCCR(1, 8, 6), 0, CCLKCFG2(1, 1, 1)},
+ {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1)},
+ {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1)},
+ {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1)},
+ {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1)},
+ {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1)}
+};
+
+#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
+static struct cpufreq_frequency_table
+ pxa27x_freq_table[NUM_PXA27x_FREQS+1];
extern unsigned get_clk_frequency_khz(int info);
+static void find_freq_tables(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table **freq_table,
+ pxa_freqs_t **pxa_freqs)
+{
+ if (cpu_is_pxa25x()) {
+ if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
+ *pxa_freqs = pxa255_run_freqs;
+ *freq_table = pxa255_run_freq_table;
+ } else if (policy->policy == CPUFREQ_POLICY_POWERSAVE) {
+ *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()) {
+ *pxa_freqs = pxa27x_freqs;
+ *freq_table = pxa27x_freq_table;
+ }
+}
+
+static void pxa27x_guess_max_freq(void)
+{
+ if (!pxa27x_maxfreq) {
+ pxa27x_maxfreq = 416000;
+ printk(KERN_INFO "PXA CPU 27x max frequency not defined "
+ "(pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
+ pxa27x_maxfreq);
+ } else {
+ pxa27x_maxfreq *= 1000;
+ }
+}
+
+static u32 mdrefr_dri(unsigned int freq)
+{
+ u32 dri = 0;
+
+ if (cpu_is_pxa25x())
+ dri = ((freq * SDRAM_TREF) / (SDRAM_ROWS * 32));
+ if (cpu_is_pxa27x())
+ dri = ((freq * SDRAM_TREF) / (SDRAM_ROWS - 31)) / 32;
+ return dri;
+}
+
/* find a valid frequency point */
static int pxa_verify_policy(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *pxa_freqs_table;
+ pxa_freqs_t *pxa_freqs;
int ret;
- if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
- pxa_freqs_table = pxa255_run_freq_table;
- } else if (policy->policy == CPUFREQ_POLICY_POWERSAVE) {
- pxa_freqs_table = pxa255_turbo_freq_table;
- } else {
- printk("CPU PXA: Unknown policy found. "
- "Using CPUFREQ_POLICY_PERFORMANCE\n");
- pxa_freqs_table = pxa255_run_freq_table;
- }
-
+ find_freq_tables(policy, &pxa_freqs_table, &pxa_freqs);
ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table);
if (freq_debug)
@@ -128,6 +222,11 @@ static int pxa_verify_policy(struct cpufreq_policy *policy)
return ret;
}
+static unsigned int pxa_cpufreq_get(unsigned int cpu)
+{
+ return get_clk_frequency_khz(0);
+}
+
static int pxa_set_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
@@ -137,22 +236,11 @@ static int pxa_set_target(struct cpufreq_policy *policy,
struct cpufreq_freqs freqs;
unsigned int idx;
unsigned long flags;
- unsigned int unused, preset_mdrefr, postset_mdrefr;
- void *ramstart = phys_to_virt(0xa0000000);
+ unsigned int new_freq_cpu, new_freq_mem;
+ unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
/* Get the current policy */
- if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
- pxa_freq_settings = pxa255_run_freqs;
- pxa_freqs_table = pxa255_run_freq_table;
- } else if (policy->policy == CPUFREQ_POLICY_POWERSAVE) {
- pxa_freq_settings = pxa255_turbo_freqs;
- pxa_freqs_table = pxa255_turbo_freq_table;
- } else {
- printk("CPU PXA: Unknown policy found. "
- "Using CPUFREQ_POLICY_PERFORMANCE\n");
- pxa_freq_settings = pxa255_run_freqs;
- pxa_freqs_table = pxa255_run_freq_table;
- }
+ find_freq_tables(policy, &pxa_freqs_table, &pxa_freq_settings);
/* Lookup the next frequency */
if (cpufreq_frequency_table_target(policy, pxa_freqs_table,
@@ -160,16 +248,17 @@ static int pxa_set_target(struct cpufreq_policy *policy,
return -EINVAL;
}
+ new_freq_cpu = pxa_freq_settings[idx].khz;
+ new_freq_mem = pxa_freq_settings[idx].membus;
freqs.old = policy->cur;
- freqs.new = pxa_freq_settings[idx].khz;
+ freqs.new = new_freq_cpu;
freqs.cpu = policy->cpu;
if (freq_debug)
pr_debug(KERN_INFO "Changing CPU frequency to %d Mhz, "
"(SDRAM %d Mhz)\n",
freqs.new / 1000, (pxa_freq_settings[idx].div2) ?
- (pxa_freq_settings[idx].membus / 2000) :
- (pxa_freq_settings[idx].membus / 1000));
+ (new_freq_mem / 2000) : (new_freq_mem / 1000));
/*
* Tell everyone what we're about to do...
@@ -183,13 +272,12 @@ static int pxa_set_target(struct cpufreq_policy *policy,
* speeding up we need to set the larger DRI value after the change.
*/
preset_mdrefr = postset_mdrefr = MDREFR;
- if ((MDREFR & MDREFR_DRI_MASK) >
- MDREFR_DRI(pxa_freq_settings[idx].membus)) {
- preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK) |
- MDREFR_DRI(pxa_freq_settings[idx].membus);
+ if ((MDREFR & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) {
+ preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK);
+ preset_mdrefr |= mdrefr_dri(new_freq_mem);
}
- postset_mdrefr = (postset_mdrefr & ~MDREFR_DRI_MASK) |
- MDREFR_DRI(pxa_freq_settings[idx].membus);
+ postset_mdrefr =
+ (postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem);
/* If we're dividing the memory clock by two for the SDRAM clock, this
* must be set prior to the change. Clearing the divide must be done
@@ -204,25 +292,26 @@ static int pxa_set_target(struct cpufreq_policy *policy,
local_irq_save(flags);
- /* Set new the CCCR */
+ /* Set new the CCCR and prepare CCLKCFG */
CCCR = pxa_freq_settings[idx].cccr;
+ cclkcfg = pxa_freq_settings[idx].cclkcfg;
asm volatile(" \n\
ldr r4, [%1] /* load MDREFR */ \n\
b 2f \n\
.align 5 \n\
1: \n\
- str %4, [%1] /* preset the MDREFR */ \n\
+ str %3, [%1] /* preset the MDREFR */ \n\
mcr p14, 0, %2, c6, c0, 0 /* set CCLKCFG[FCS] */ \n\
- str %5, [%1] /* postset the MDREFR */ \n\
+ str %4, [%1] /* postset the MDREFR */ \n\
\n\
b 3f \n\
2: b 1b \n\
3: nop \n\
"
: "=&r" (unused)
- : "r" (&MDREFR), "r" (CCLKCFG_TURBO|CCLKCFG_FCS), "r" (ramstart),
- "r" (preset_mdrefr), "r" (postset_mdrefr)
+ : "r" (&MDREFR), "r" (cclkcfg),
+ "r" (preset_mdrefr), "r" (postset_mdrefr)
: "r4", "r5");
local_irq_restore(flags);
@@ -236,39 +325,57 @@ static int pxa_set_target(struct cpufreq_policy *policy,
return 0;
}
-static unsigned int pxa_cpufreq_get(unsigned int cpu)
-{
- return get_clk_frequency_khz(0);
-}
-
-static int pxa_cpufreq_init(struct cpufreq_policy *policy)
+static __init int pxa_cpufreq_init(struct cpufreq_policy *policy)
{
int i;
+ unsigned int freq;
+
+ /* try to guess pxa27x cpu */
+ if (cpu_is_pxa27x())
+ pxa27x_guess_max_freq();
/* set default policy and cpuinfo */
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
- policy->policy = CPUFREQ_POLICY_PERFORMANCE;
- policy->cpuinfo.max_freq = PXA25x_MAX_FREQ;
- policy->cpuinfo.min_freq = PXA25x_MIN_FREQ;
+ if (cpu_is_pxa25x())
+ policy->policy = CPUFREQ_POLICY_PERFORMANCE;
policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
policy->cur = get_clk_frequency_khz(0); /* current freq */
policy->min = policy->max = policy->cur;
- /* Generate the run cpufreq_frequency_table struct */
- for (i = 0; i < NUM_RUN_FREQS; i++) {
+ /* Generate pxa25x the run cpufreq_frequency_table struct */
+ for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
pxa255_run_freq_table[i].index = i;
}
-
pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
- /* Generate the turbo cpufreq_frequency_table struct */
- for (i = 0; i < NUM_TURBO_FREQS; i++) {
+
+ /* Generate pxa25x the turbo cpufreq_frequency_table struct */
+ for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
pxa255_turbo_freq_table[i].frequency =
pxa255_turbo_freqs[i].khz;
pxa255_turbo_freq_table[i].index = i;
}
pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
+ /* Generate the pxa27x cpufreq_frequency_table struct */
+ for (i = 0; i < NUM_PXA27x_FREQS; i++) {
+ freq = pxa27x_freqs[i].khz;
+ if (freq > pxa27x_maxfreq)
+ break;
+ pxa27x_freq_table[i].frequency = freq;
+ pxa27x_freq_table[i].index = i;
+ }
+ pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
+
+ /*
+ * 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);
+ else if (cpu_is_pxa27x())
+ cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table);
+
printk(KERN_INFO "PXA CPU frequency change support initialized\n");
return 0;
@@ -279,21 +386,20 @@ static struct cpufreq_driver pxa_cpufreq_driver = {
.target = pxa_set_target,
.init = pxa_cpufreq_init,
.get = pxa_cpufreq_get,
- .name = "PXA25x",
+ .name = "PXA2xx",
};
static int __init pxa_cpu_init(void)
{
int ret = -ENODEV;
- if (cpu_is_pxa25x())
+ if (cpu_is_pxa25x() || cpu_is_pxa27x())
ret = cpufreq_register_driver(&pxa_cpufreq_driver);
return ret;
}
static void __exit pxa_cpu_exit(void)
{
- if (cpu_is_pxa25x())
- cpufreq_unregister_driver(&pxa_cpufreq_driver);
+ cpufreq_unregister_driver(&pxa_cpufreq_driver);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-17 12:39:03 +0000