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-rw-r--r--recipes/linux/gumstix-kernel-2.6.21/bkpxa-pxa-cpufreq.patch403
1 files changed, 403 insertions, 0 deletions
diff --git a/recipes/linux/gumstix-kernel-2.6.21/bkpxa-pxa-cpufreq.patch b/recipes/linux/gumstix-kernel-2.6.21/bkpxa-pxa-cpufreq.patch
new file mode 100644
index 0000000000..f3d8396a61
--- /dev/null
+++ b/recipes/linux/gumstix-kernel-2.6.21/bkpxa-pxa-cpufreq.patch
@@ -0,0 +1,403 @@
+Status: WORKS
+PXA CPU frequency change support
+added mods from Stefan Eletzhofer and Lothar Weissmann
+
+#
+# Patch managed by http://www.mn-logistik.de/unsupported/pxa250/patcher
+#
+
+Index: linux-2.6.21gum/arch/arm/Kconfig
+===================================================================
+--- linux-2.6.21gum.orig/arch/arm/Kconfig
++++ linux-2.6.21gum/arch/arm/Kconfig
+@@ -800,7 +800,7 @@ config KEXEC
+
+ endmenu
+
+-if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX )
++if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA )
+
+ menu "CPU Frequency scaling"
+
+@@ -838,6 +838,12 @@ config CPU_FREQ_IMX
+
+ endmenu
+
++config CPU_FREQ_PXA
++ bool
++ depends on CPU_FREQ && ARCH_PXA
++ default y
++ select CPU_FREQ_DEFAULT_GOV_USERSPACE
++
+ endif
+
+ menu "Floating point emulation"
+Index: linux-2.6.21gum/arch/arm/mach-pxa/Makefile
+===================================================================
+--- linux-2.6.21gum.orig/arch/arm/mach-pxa/Makefile
++++ linux-2.6.21gum/arch/arm/mach-pxa/Makefile
+@@ -32,6 +32,7 @@ obj-$(CONFIG_LEDS) += $(led-y)
+ # Misc features
+ obj-$(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
+Index: linux-2.6.21gum/arch/arm/mach-pxa/cpu-pxa.c
+===================================================================
+--- /dev/null
++++ linux-2.6.21gum/arch/arm/mach-pxa/cpu-pxa.c
+@@ -0,0 +1,321 @@
++/*
++ * 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>
++
++#define DEBUG 0
++
++#ifdef DEBUG
++ static unsigned int freq_debug = DEBUG;
++ MODULE_PARM(freq_debug, "i");
++ 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 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 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*/
++ { 99500, 99500, 0x121, 1}, /* run= 99, turbo= 99, PXbus=50, SDRAM=50 */
++ {132700, 132700, 0x123, 1}, /* run=133, turbo=133, PXbus=66, SDRAM=66 */
++ {199100, 99500, 0x141, 0}, /* run=199, turbo=199, PXbus=99, SDRAM=99 */
++ {265400, 132700, 0x143, 1}, /* run=265, turbo=265, PXbus=133, SDRAM=66 */
++ {331800, 165900, 0x145, 1}, /* run=331, turbo=331, PXbus=166, SDRAM=83 */
++ {398100, 99500, 0x161, 0}, /* run=398, turbo=398, PXbus=196, SDRAM=99 */
++ {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*/
++ { 99500, 99500, 0x121, 1}, /* run=99, turbo= 99, PXbus=50, SDRAM=50 */
++ {199100, 99500, 0x221, 0}, /* run=99, turbo=199, PXbus=50, SDRAM=99 */
++ {298500, 99500, 0x321, 0}, /* run=99, turbo=287, PXbus=50, SDRAM=99 */
++ {298600, 99500, 0x1c1, 0}, /* run=199, turbo=287, PXbus=99, SDRAM=99 */
++ {398100, 99500, 0x241, 0}, /* run=199, turbo=398, PXbus=99, SDRAM=99 */
++ {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;
++ unsigned long 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;
++
++ /*
++ * 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, 1 << 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));
++ }
++
++ void *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)
++{
++ unsigned long cpus_allowed;
++ unsigned int cpu = policy->cpu;
++ int i;
++
++ cpus_allowed = current->cpus_allowed;
++
++ set_cpus_allowed(current, 1 << 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);
++
+Index: linux-2.6.21gum/Documentation/cpu-freq/user-guide.txt
+===================================================================
+--- linux-2.6.21gum.orig/Documentation/cpu-freq/user-guide.txt
++++ linux-2.6.21gum/Documentation/cpu-freq/user-guide.txt
+@@ -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 @@ Contents:
+ 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
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-20 01:53:22 +0000