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-rw-r--r--arch/arm/mach-pxa/cpufreq-pxa2xx.c104
1 files changed, 85 insertions, 19 deletions
diff --git a/arch/arm/mach-pxa/cpufreq-pxa2xx.c b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
index 083a1d851d49..3a8ee2272add 100644
--- a/arch/arm/mach-pxa/cpufreq-pxa2xx.c
+++ b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
@@ -36,6 +36,8 @@
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/regulator/consumer.h>
#include <mach/pxa2xx-regs.h>
@@ -47,6 +49,8 @@ MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
#define freq_debug 0
#endif
+static struct regulator *vcc_core;
+
static unsigned int pxa27x_maxfreq;
module_param(pxa27x_maxfreq, uint, 0);
MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
@@ -58,6 +62,8 @@ typedef struct {
unsigned int cccr;
unsigned int div2;
unsigned int cclkcfg;
+ int vmin;
+ int vmax;
} pxa_freqs_t;
/* Define the refresh period in mSec for the SDRAM and the number of rows */
@@ -82,24 +88,24 @@ static unsigned int sdram_rows;
static pxa_freqs_t pxa255_run_freqs[] =
{
- /* 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 */
+ /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
+ { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
+ {132700, 132700, 0x123, 1, CCLKCFG, -1, -1}, /* 133, 133, 66, 66 */
+ {199100, 99500, 0x141, 0, CCLKCFG, -1, -1}, /* 199, 199, 99, 99 */
+ {265400, 132700, 0x143, 1, CCLKCFG, -1, -1}, /* 265, 265, 133, 66 */
+ {331800, 165900, 0x145, 1, CCLKCFG, -1, -1}, /* 331, 331, 166, 83 */
+ {398100, 99500, 0x161, 0, CCLKCFG, -1, -1}, /* 398, 398, 196, 99 */
};
/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
static pxa_freqs_t pxa255_turbo_freqs[] =
{
/* 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 */
+ { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
+ {199100, 99500, 0x221, 0, CCLKCFG, -1, -1}, /* 99, 199, 50, 99 */
+ {298500, 99500, 0x321, 0, CCLKCFG, -1, -1}, /* 99, 287, 50, 99 */
+ {298600, 99500, 0x1c1, 0, CCLKCFG, -1, -1}, /* 199, 287, 99, 99 */
+ {398100, 99500, 0x241, 0, CCLKCFG, -1, -1}, /* 199, 398, 99, 99 */
};
#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
@@ -148,13 +154,13 @@ MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table
((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)}
+ {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1), 900000, 1705000 },
+ {156000, 104000, PXA27x_CCCR(1, 8, 6), 0, CCLKCFG2(1, 1, 1), 1000000, 1705000 },
+ {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 },
+ {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 },
+ {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 },
+ {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 },
+ {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 }
};
#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
@@ -163,6 +169,47 @@ static struct cpufreq_frequency_table
extern unsigned get_clk_frequency_khz(int info);
+#ifdef CONFIG_REGULATOR
+
+static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
+{
+ int ret = 0;
+ int vmin, vmax;
+
+ if (!cpu_is_pxa27x())
+ return 0;
+
+ vmin = pxa_freq->vmin;
+ vmax = pxa_freq->vmax;
+ if ((vmin == -1) || (vmax == -1))
+ return 0;
+
+ ret = regulator_set_voltage(vcc_core, vmin, vmax);
+ if (ret)
+ pr_err("cpufreq: Failed to set vcc_core in [%dmV..%dmV]\n",
+ vmin, vmax);
+ return ret;
+}
+
+static __init void pxa_cpufreq_init_voltages(void)
+{
+ vcc_core = regulator_get(NULL, "vcc_core");
+ if (IS_ERR(vcc_core)) {
+ pr_info("cpufreq: Didn't find vcc_core regulator\n");
+ vcc_core = NULL;
+ } else {
+ pr_info("cpufreq: Found vcc_core regulator\n");
+ }
+}
+#else
+static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
+{
+ return 0;
+}
+
+static __init void pxa_cpufreq_init_voltages(void) { }
+#endif
+
static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
pxa_freqs_t **pxa_freqs)
{
@@ -251,6 +298,7 @@ static int pxa_set_target(struct cpufreq_policy *policy,
unsigned long flags;
unsigned int new_freq_cpu, new_freq_mem;
unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
+ int ret = 0;
/* Get the current policy */
find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
@@ -273,6 +321,10 @@ static int pxa_set_target(struct cpufreq_policy *policy,
freqs.new / 1000, (pxa_freq_settings[idx].div2) ?
(new_freq_mem / 2000) : (new_freq_mem / 1000));
+ if (vcc_core && freqs.new > freqs.old)
+ ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
+ if (ret)
+ return ret;
/*
* Tell everyone what we're about to do...
* you should add a notify client with any platform specific
@@ -335,6 +387,18 @@ static int pxa_set_target(struct cpufreq_policy *policy,
*/
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ /*
+ * Even if voltage setting fails, we don't report it, as the frequency
+ * change succeeded. The voltage reduction is not a critical failure,
+ * only power savings will suffer from this.
+ *
+ * Note: if the voltage change fails, and a return value is returned, a
+ * bug is triggered (seems a deadlock). Should anybody find out where,
+ * the "return 0" should become a "return ret".
+ */
+ if (vcc_core && freqs.new < freqs.old)
+ ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
+
return 0;
}
@@ -349,6 +413,8 @@ static __init int pxa_cpufreq_init(struct cpufreq_policy *policy)
if (cpu_is_pxa27x())
pxa27x_guess_max_freq();
+ pxa_cpufreq_init_voltages();
+
init_sdram_rows();
/* set default policy and cpuinfo */
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