diff options
author | kaloz <kaloz@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2008-04-27 16:56:19 +0000 |
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committer | kaloz <kaloz@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2008-04-27 16:56:19 +0000 |
commit | c886d2690dae0258d64fef02d8a24c901f7c2d6b (patch) | |
tree | dbcd5d214918a932007299fa02556ce313a194be /target/linux/pxa/patches-2.6.21/010-bkpxa-pxa-cpufreq.patch | |
parent | 1984be21949bc400d17272b33d7482f0902eec76 (diff) |
incomplete Gumstix support
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10955 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/pxa/patches-2.6.21/010-bkpxa-pxa-cpufreq.patch')
-rw-r--r-- | target/linux/pxa/patches-2.6.21/010-bkpxa-pxa-cpufreq.patch | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/target/linux/pxa/patches-2.6.21/010-bkpxa-pxa-cpufreq.patch b/target/linux/pxa/patches-2.6.21/010-bkpxa-pxa-cpufreq.patch new file mode 100644 index 000000000..f3d8396a6 --- /dev/null +++ b/target/linux/pxa/patches-2.6.21/010-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 |