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openwrt-xburst/target/linux/pxa/patches/000-cpufreq.patch

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basic pxa support; likely broken git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6232 3c298f89-4303-0410-b956-a3cf2f4a3e73
2007-01-31 02:11:27 +02:00
diff -Nurbw linux-2.6.17/arch/arm/Kconfig linux-2.6.17-patched/arch/arm/Kconfig
--- linux-2.6.17/arch/arm/Kconfig 2006-06-17 18:49:35.000000000 -0700
+++ linux-2.6.17-patched/arch/arm/Kconfig 2006-09-21 14:57:02.000000000 -0700
@@ -656,7 +656,7 @@
endmenu
-if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
+if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1 || ARCH_PXA)
menu "CPU Frequency scaling"
@@ -685,6 +685,13 @@
endmenu
+config CPU_FREQ_PXA
+ bool
+ depends on CPU_FREQ && ARCH_PXA
+ default y
+ select CPU_FREQ_DEFAULT_GOV_USERSPACE
+ select CPU_FREQ_TABLE
+
endif
menu "Floating point emulation"
diff -Nurbw linux-2.6.17/arch/arm/mach-pxa/cpu-pxa.c linux-2.6.17-patched/arch/arm/mach-pxa/cpu-pxa.c
--- linux-2.6.17/arch/arm/mach-pxa/cpu-pxa.c 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17-patched/arch/arm/mach-pxa/cpu-pxa.c 2006-09-21 14:57:02.000000000 -0700
@@ -0,0 +1,324 @@
+/*
+ * linux/arch/arm/mach-pxa/cpu-pxa.c
+ *
+ * Copyright (C) 2002,2003 Intrinsyc Software
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * History:
+ * 31-Jul-2002 : Initial version [FB]
+ * 29-Jan-2003 : added PXA255 support [FB]
+ * 20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.)
+ *
+ * Note:
+ * This driver may change the memory bus clock rate, but will not do any
+ * platform specific access timing changes... for example if you have flash
+ * memory connected to CS0, you will need to register a platform specific
+ * notifier which will adjust the memory access strobes to maintain a
+ * minimum strobe width.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+
+#include <asm/hardware.h>
+#include <asm/arch/pxa-regs.h>
+
+#undef DEBUG
+
+#ifdef DEBUG
+ static unsigned int freq_debug = DEBUG;
+ module_param(freq_debug, int, 0);
+ MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
+#else
+ #define freq_debug 0
+#endif
+
+typedef struct
+{
+ unsigned int khz;
+ unsigned int membus;
+ unsigned int cccr;
+ unsigned int div2;
+} 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 2048 /* 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 99533
+#define PXA25x_MAX_FREQ 530842
+#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
+#define MDREFR_DRI_MASK 0xFFF
+
+
+/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */
+static pxa_freqs_t pxa255_run_freqs[] =
+{
+ /* CPU MEMBUS CCCR DIV2*/
+ { 99533, 99533, 0x121, 1}, /* run= 99, turbo= 99, PXbus=50, SDRAM=50 */
+ {132710, 132710, 0x123, 1}, /* run=133, turbo=133, PXbus=66, SDRAM=66 */
+ {199066, 99533, 0x141, 0}, /* run=199, turbo=199, PXbus=99, SDRAM=99 */
+ {265421, 132710, 0x143, 0}, /* run=265, turbo=265, PXbus=133, SDRAM=133 */
+ {331776, 165888, 0x145, 1}, /* run=331, turbo=331, PXbus=166, SDRAM=83 */
+ {398131, 99533, 0x161, 0}, /* run=398, turbo=398, PXbus=99, SDRAM=99 */
+ {398131, 132710, 0x1c3, 0}, /* run=265, turbo=398, PXbus=133, SDRAM=133 */
+ {530842, 132710, 0x163, 0}, /* run=531, turbo=531, PXbus=133, SDRAM=133 */
+ {0,}
+};
+#define NUM_RUN_FREQS (sizeof(pxa255_run_freqs)/sizeof(pxa_freqs_t))
+
+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*/
+ { 99533, 99533, 0x121, 1}, /* run=99, turbo= 99, PXbus=99, SDRAM=50 */
+ {149299, 99533, 0x1a1, 0}, /* run=99, turbo=149, PXbus=99, SDRAM=99 */
+ {199066, 99533, 0x221, 0}, /* run=99, turbo=199, PXbus=99, SDRAM=99 */
+ {298598, 99533, 0x321, 0}, /* run=99, turbo=299, PXbus=99, SDRAM=99 */
+ {398131, 99533, 0x241, 1}, /* run=199, turbo=398, PXbus=99, SDRAM=50 */
+ {0,}
+};
+#define NUM_TURBO_FREQS (sizeof(pxa255_turbo_freqs)/sizeof(pxa_freqs_t))
+
+static struct cpufreq_frequency_table pxa255_turbo_freq_table[NUM_TURBO_FREQS+1];
+
+extern unsigned get_clk_frequency_khz(int info);
+
+/* find a valid frequency point */
+static int pxa_verify_policy(struct cpufreq_policy *policy)
+{
+ int ret;
+ struct cpufreq_frequency_table *pxa_freqs_table;
+
+ 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;
+ }
+ ret=cpufreq_frequency_table_verify(policy, pxa_freqs_table);
+
+ if(freq_debug) {
+ printk("Verified CPU policy: %dKhz min to %dKhz max\n",
+ policy->min, policy->max);
+ }
+
+ return ret;
+}
+
+static int pxa_set_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ int idx;
+ cpumask_t cpus_allowed;
+ int cpu = policy->cpu;
+ struct cpufreq_freqs freqs;
+ pxa_freqs_t *pxa_freq_settings;
+ struct cpufreq_frequency_table *pxa_freqs_table;
+ unsigned long flags;
+ unsigned int unused;
+ unsigned int preset_mdrefr, postset_mdrefr;
+ void *ramstart;
+
+ /*
+ * Save this threads cpus_allowed mask.
+ */
+ cpus_allowed = current->cpus_allowed;
+
+ /*
+ * Bind to the specified CPU. When this call returns,
+ * we should be running on the right CPU.
+ */
+ set_cpus_allowed(current, cpumask_of_cpu(cpu));
+ BUG_ON(cpu != smp_processor_id());
+
+ /* 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;
+ }
+
+ /* Lookup the next frequency */
+ if (cpufreq_frequency_table_target(policy, pxa_freqs_table,
+ target_freq, relation, &idx)) {
+ return -EINVAL;
+ }
+
+ freqs.old = policy->cur;
+ freqs.new = pxa_freq_settings[idx].khz;
+ freqs.cpu = policy->cpu;
+ if(freq_debug) {
+ printk(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));
+ }
+
+ ramstart = phys_to_virt(0xa0000000);
+
+ /*
+ * Tell everyone what we're about to do...
+ * you should add a notify client with any platform specific
+ * Vcc changing capability
+ */
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+ /* Calculate the next MDREFR. If we're slowing down the SDRAM clock
+ * we need to preset the smaller DRI before the change. If we're 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);
+ }
+ postset_mdrefr = (postset_mdrefr & ~MDREFR_DRI_MASK) |
+ MDREFR_DRI(pxa_freq_settings[idx].membus);
+
+ /* 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
+ * after the change.
+ */
+ if(pxa_freq_settings[idx].div2) {
+ preset_mdrefr |= MDREFR_DB2_MASK;
+ postset_mdrefr |= MDREFR_DB2_MASK;
+ } else {
+ postset_mdrefr &= ~MDREFR_DB2_MASK;
+ }
+
+ local_irq_save(flags);
+
+ /* Set new the CCCR */
+ CCCR = pxa_freq_settings[idx].cccr;
+
+ __asm__ __volatile__(" \
+ ldr r4, [%1] ; /* load MDREFR */ \
+ b 2f ; \
+ .align 5 ; \
+1: \
+ str %4, [%1] ; /* preset the MDREFR */ \
+ mcr p14, 0, %2, c6, c0, 0 ; /* set CCLKCFG[FCS] */ \
+ str %5, [%1] ; /* postset the MDREFR */ \
+ \
+ b 3f ; \
+2: b 1b ; \
+3: nop ; \
+ "
+ : "=&r" (unused)
+ : "r" (&MDREFR), "r" (CCLKCFG_TURBO|CCLKCFG_FCS), "r" (ramstart), \
+ "r" (preset_mdrefr), "r" (postset_mdrefr)
+ : "r4", "r5");
+ local_irq_restore(flags);
+
+ /*
+ * Restore the CPUs allowed mask.
+ */
+ set_cpus_allowed(current, cpus_allowed);
+
+ /*
+ * Tell everyone what we've just done...
+ * you should add a notify client with any platform specific
+ * SDRAM refresh timer adjustments
+ */
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static int pxa_cpufreq_init(struct cpufreq_policy *policy)
+{
+ cpumask_t cpus_allowed;
+ unsigned int cpu = policy->cpu;
+ int i;
+
+ cpus_allowed = current->cpus_allowed;
+
+ set_cpus_allowed(current, cpumask_of_cpu(cpu));
+ BUG_ON(cpu != smp_processor_id());
+
+ /* 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;
+ 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++) {
+ 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++) {
+ 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;
+
+ set_cpus_allowed(current, cpus_allowed);
+ printk(KERN_INFO "PXA CPU frequency change support initialized\n");
+
+ return 0;
+}
+
+static struct cpufreq_driver pxa_cpufreq_driver = {
+ .verify = pxa_verify_policy,
+ .target = pxa_set_target,
+ .init = pxa_cpufreq_init,
+ .name = "PXA25x",
+};
+
+static int __init pxa_cpu_init(void)
+{
+ return cpufreq_register_driver(&pxa_cpufreq_driver);
+}
+
+static void __exit pxa_cpu_exit(void)
+{
+ cpufreq_unregister_driver(&pxa_cpufreq_driver);
+}
+
+
+MODULE_AUTHOR ("Intrinsyc Software Inc.");
+MODULE_DESCRIPTION ("CPU frequency changing driver for the PXA architecture");
+MODULE_LICENSE("GPL");
+module_init(pxa_cpu_init);
+module_exit(pxa_cpu_exit);
+
diff -Nurbw linux-2.6.17/arch/arm/mach-pxa/Makefile linux-2.6.17-patched/arch/arm/mach-pxa/Makefile
--- linux-2.6.17/arch/arm/mach-pxa/Makefile 2006-09-21 15:11:33.000000000 -0700
+++ linux-2.6.17-patched/arch/arm/mach-pxa/Makefile 2006-09-21 14:57:02.000000000 -0700
@@ -30,5 +30,6 @@
obj-$(CONFIG_PM) += pm.o sleep.o
obj-$(CONFIG_PXA_SSP) += ssp.o
+obj-$(CONFIG_CPU_FREQ) += cpu-pxa.o
ifeq ($(CONFIG_PXA27x),y)
obj-$(CONFIG_PM) += standby.o
diff -Nurbw linux-2.6.17/Documentation/cpu-freq/user-guide.txt linux-2.6.17-patched/Documentation/cpu-freq/user-guide.txt
--- linux-2.6.17/Documentation/cpu-freq/user-guide.txt 2006-06-17 18:49:35.000000000 -0700
+++ linux-2.6.17-patched/Documentation/cpu-freq/user-guide.txt 2006-09-21 14:57:02.000000000 -0700
@@ -18,7 +18,7 @@
Contents:
---------
1. Supported Architectures and Processors
-1.1 ARM
+1.1 ARM, PXA
1.2 x86
1.3 sparc64
1.4 ppc
@@ -37,14 +37,15 @@
1. Supported Architectures and Processors
=========================================
-1.1 ARM
--------
+1.1 ARM, PXA
+------------
The following ARM processors are supported by cpufreq:
ARM Integrator
ARM-SA1100
ARM-SA1110
+Intel PXA
1.2 x86
diff -Nurbw linux-2.6.17/drivers/cpufreq/Kconfig linux-2.6.17-patched/drivers/cpufreq/Kconfig
--- linux-2.6.17/drivers/cpufreq/Kconfig 2006-06-17 18:49:35.000000000 -0700
+++ linux-2.6.17-patched/drivers/cpufreq/Kconfig 2006-09-21 15:06:12.000000000 -0700
@@ -46,13 +46,9 @@
This will show detail CPU frequency translation table in sysfs file
system
-# Note that it is not currently possible to set the other governors (such as ondemand)
-# as the default, since if they fail to initialise, cpufreq will be
-# left in an undefined state.
-
choice
prompt "Default CPUFreq governor"
- default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
+ default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110 || CPU_FREQ_PXA
default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
help
This option sets which CPUFreq governor shall be loaded at
@@ -66,6 +62,14 @@
the frequency statically to the highest frequency supported by
the CPU.
+config CPU_FREQ_DEFAULT_GOV_POWERSAVE
+ bool "powersave"
+ select CPU_FREQ_GOV_POWERSAVE
+ help
+ Use the CPUFreq governor 'powersave' as default. This sets
+ the frequency statically to the lowest frequency supported by
+ the CPU.
+
config CPU_FREQ_DEFAULT_GOV_USERSPACE
bool "userspace"
select CPU_FREQ_GOV_USERSPACE
@@ -75,6 +79,23 @@
program shall be able to set the CPU dynamically without having
to enable the userspace governor manually.
+config CPU_FREQ_DEFAULT_GOV_ONDEMAND
+ bool "ondemand"
+ select CPU_FREQ_GOV_ONDEMAND
+ help
+ Use the CPUFreq governor 'ondemand' as default. This sets
+ the frequency dynamically based on CPU load, throttling up
+ and down as necessary.
+
+config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
+ bool "conservative"
+ select CPU_FREQ_GOV_CONSERVATIVE
+ help
+ Use the CPUFreq governor 'conservative' as default. This sets
+ the frequency dynamically based on CPU load, throttling up
+ and down as necessary. The frequency is gracefully increased
+ and decreased rather than jumping to 100% when speed is required.
+
endchoice
config CPU_FREQ_GOV_PERFORMANCE
diff -Nurbw linux-2.6.17/include/linux/cpufreq.h linux-2.6.17-patched/include/linux/cpufreq.h
--- linux-2.6.17/include/linux/cpufreq.h 2006-06-17 18:49:35.000000000 -0700
+++ linux-2.6.17-patched/include/linux/cpufreq.h 2006-09-21 15:08:35.000000000 -0700
@@ -276,9 +276,18 @@
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
extern struct cpufreq_governor cpufreq_gov_performance;
#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_performance
+#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
+extern struct cpufreq_governor cpufreq_gov_powersave;
+#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_powersave
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
extern struct cpufreq_governor cpufreq_gov_userspace;
#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_userspace
+#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
+extern struct cpufreq_governor cpufreq_gov_ondemand;
+#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_ondemand;
+#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
+extern struct cpufreq_governor cpufreq_gov_conservative;
+#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_conservative;
#endif
diff -Nubrw --exclude='.*.o.cmd' linux-2.6.17/drivers/cpufreq/cpufreq_conservative.c linux-2.6.17-patched/drivers/cpufreq/cpufreq_conservative.c
--- linux-2.6.17/drivers/cpufreq/cpufreq_conservative.c 2006-09-21 15:26:46.000000000 -0700
+++ linux-2.6.17-patched/drivers/cpufreq/cpufreq_conservative.c 2006-06-17 18:49:35.000000000 -0700
@@ -529,7 +529,7 @@
return 0;
}
-static struct cpufreq_governor cpufreq_gov_dbs = {
+struct cpufreq_governor cpufreq_gov_conservative = {
.name = "conservative",
.governor = cpufreq_governor_dbs,
.owner = THIS_MODULE,
@@ -537,7 +537,7 @@
static int __init cpufreq_gov_dbs_init(void)
{
- return cpufreq_register_governor(&cpufreq_gov_dbs);
+ return cpufreq_register_governor(&cpufreq_gov_conservative);
}
static void __exit cpufreq_gov_dbs_exit(void)
@@ -545,7 +545,7 @@
/* Make sure that the scheduled work is indeed not running */
flush_scheduled_work();
- cpufreq_unregister_governor(&cpufreq_gov_dbs);
+ cpufreq_unregister_governor(&cpufreq_gov_conservative);
}
diff -Nubrw --exclude='.*.o.cmd' linux-2.6.17/drivers/cpufreq/cpufreq_ondemand.c linux-2.6.17-patched/drivers/cpufreq/cpufreq_ondemand.c
--- linux-2.6.17/drivers/cpufreq/cpufreq_ondemand.c 2006-06-17 18:49:35.000000000 -0700
+++ linux-2.6.17-patched/drivers/cpufreq/cpufreq_ondemand.c 2006-09-27 14:00:15.000000000 -0700
@@ -484,7 +484,7 @@
return 0;
}
-static struct cpufreq_governor cpufreq_gov_dbs = {
+struct cpufreq_governor cpufreq_gov_ondemand = {
.name = "ondemand",
.governor = cpufreq_governor_dbs,
.owner = THIS_MODULE,
@@ -492,7 +492,7 @@
static int __init cpufreq_gov_dbs_init(void)
{
- return cpufreq_register_governor(&cpufreq_gov_dbs);
+ return cpufreq_register_governor(&cpufreq_gov_ondemand);
}
static void __exit cpufreq_gov_dbs_exit(void)
@@ -504,7 +504,7 @@
destroy_workqueue(dbs_workq);
}
- cpufreq_unregister_governor(&cpufreq_gov_dbs);
+ cpufreq_unregister_governor(&cpufreq_gov_ondemand);
}
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