diff options
Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/gx-suspmod.c')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/gx-suspmod.c | 517 |
1 files changed, 0 insertions, 517 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/gx-suspmod.c b/arch/x86/kernel/cpu/cpufreq/gx-suspmod.c deleted file mode 100644 index 32974cf8423..00000000000 --- a/arch/x86/kernel/cpu/cpufreq/gx-suspmod.c +++ /dev/null @@ -1,517 +0,0 @@ -/* - * Cyrix MediaGX and NatSemi Geode Suspend Modulation - * (C) 2002 Zwane Mwaikambo <zwane@commfireservices.com> - * (C) 2002 Hiroshi Miura <miura@da-cha.org> - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation - * - * The author(s) of this software shall not be held liable for damages - * of any nature resulting due to the use of this software. This - * software is provided AS-IS with no warranties. - * - * Theoretical note: - * - * (see Geode(tm) CS5530 manual (rev.4.1) page.56) - * - * CPU frequency control on NatSemi Geode GX1/GXLV processor and CS55x0 - * are based on Suspend Modulation. - * - * Suspend Modulation works by asserting and de-asserting the SUSP# pin - * to CPU(GX1/GXLV) for configurable durations. When asserting SUSP# - * the CPU enters an idle state. GX1 stops its core clock when SUSP# is - * asserted then power consumption is reduced. - * - * Suspend Modulation's OFF/ON duration are configurable - * with 'Suspend Modulation OFF Count Register' - * and 'Suspend Modulation ON Count Register'. - * These registers are 8bit counters that represent the number of - * 32us intervals which the SUSP# pin is asserted(ON)/de-asserted(OFF) - * to the processor. - * - * These counters define a ratio which is the effective frequency - * of operation of the system. - * - * OFF Count - * F_eff = Fgx * ---------------------- - * OFF Count + ON Count - * - * 0 <= On Count, Off Count <= 255 - * - * From these limits, we can get register values - * - * off_duration + on_duration <= MAX_DURATION - * on_duration = off_duration * (stock_freq - freq) / freq - * - * off_duration = (freq * DURATION) / stock_freq - * on_duration = DURATION - off_duration - * - * - *--------------------------------------------------------------------------- - * - * ChangeLog: - * Dec. 12, 2003 Hiroshi Miura <miura@da-cha.org> - * - fix on/off register mistake - * - fix cpu_khz calc when it stops cpu modulation. - * - * Dec. 11, 2002 Hiroshi Miura <miura@da-cha.org> - * - rewrite for Cyrix MediaGX Cx5510/5520 and - * NatSemi Geode Cs5530(A). - * - * Jul. ??, 2002 Zwane Mwaikambo <zwane@commfireservices.com> - * - cs5530_mod patch for 2.4.19-rc1. - * - *--------------------------------------------------------------------------- - * - * Todo - * Test on machines with 5510, 5530, 5530A - */ - -/************************************************************************ - * Suspend Modulation - Definitions * - ************************************************************************/ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/cpufreq.h> -#include <linux/pci.h> -#include <linux/errno.h> -#include <linux/slab.h> - -#include <asm/processor-cyrix.h> - -/* PCI config registers, all at F0 */ -#define PCI_PMER1 0x80 /* power management enable register 1 */ -#define PCI_PMER2 0x81 /* power management enable register 2 */ -#define PCI_PMER3 0x82 /* power management enable register 3 */ -#define PCI_IRQTC 0x8c /* irq speedup timer counter register:typical 2 to 4ms */ -#define PCI_VIDTC 0x8d /* video speedup timer counter register: typical 50 to 100ms */ -#define PCI_MODOFF 0x94 /* suspend modulation OFF counter register, 1 = 32us */ -#define PCI_MODON 0x95 /* suspend modulation ON counter register */ -#define PCI_SUSCFG 0x96 /* suspend configuration register */ - -/* PMER1 bits */ -#define GPM (1<<0) /* global power management */ -#define GIT (1<<1) /* globally enable PM device idle timers */ -#define GTR (1<<2) /* globally enable IO traps */ -#define IRQ_SPDUP (1<<3) /* disable clock throttle during interrupt handling */ -#define VID_SPDUP (1<<4) /* disable clock throttle during vga video handling */ - -/* SUSCFG bits */ -#define SUSMOD (1<<0) /* enable/disable suspend modulation */ -/* the below is supported only with cs5530 (after rev.1.2)/cs5530A */ -#define SMISPDUP (1<<1) /* select how SMI re-enable suspend modulation: */ - /* IRQTC timer or read SMI speedup disable reg.(F1BAR[08-09h]) */ -#define SUSCFG (1<<2) /* enable powering down a GXLV processor. "Special 3Volt Suspend" mode */ -/* the below is supported only with cs5530A */ -#define PWRSVE_ISA (1<<3) /* stop ISA clock */ -#define PWRSVE (1<<4) /* active idle */ - -struct gxfreq_params { - u8 on_duration; - u8 off_duration; - u8 pci_suscfg; - u8 pci_pmer1; - u8 pci_pmer2; - struct pci_dev *cs55x0; -}; - -static struct gxfreq_params *gx_params; -static int stock_freq; - -/* PCI bus clock - defaults to 30.000 if cpu_khz is not available */ -static int pci_busclk; -module_param(pci_busclk, int, 0444); - -/* maximum duration for which the cpu may be suspended - * (32us * MAX_DURATION). If no parameter is given, this defaults - * to 255. - * Note that this leads to a maximum of 8 ms(!) where the CPU clock - * is suspended -- processing power is just 0.39% of what it used to be, - * though. 781.25 kHz(!) for a 200 MHz processor -- wow. */ -static int max_duration = 255; -module_param(max_duration, int, 0444); - -/* For the default policy, we want at least some processing power - * - let's say 5%. (min = maxfreq / POLICY_MIN_DIV) - */ -#define POLICY_MIN_DIV 20 - - -#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \ - "gx-suspmod", msg) - -/** - * we can detect a core multipiler from dir0_lsb - * from GX1 datasheet p.56, - * MULT[3:0]: - * 0000 = SYSCLK multiplied by 4 (test only) - * 0001 = SYSCLK multiplied by 10 - * 0010 = SYSCLK multiplied by 4 - * 0011 = SYSCLK multiplied by 6 - * 0100 = SYSCLK multiplied by 9 - * 0101 = SYSCLK multiplied by 5 - * 0110 = SYSCLK multiplied by 7 - * 0111 = SYSCLK multiplied by 8 - * of 33.3MHz - **/ -static int gx_freq_mult[16] = { - 4, 10, 4, 6, 9, 5, 7, 8, - 0, 0, 0, 0, 0, 0, 0, 0 -}; - - -/**************************************************************** - * Low Level chipset interface * - ****************************************************************/ -static struct pci_device_id gx_chipset_tbl[] __initdata = { - { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY), }, - { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), }, - { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), }, - { 0, }, -}; - -static void gx_write_byte(int reg, int value) -{ - pci_write_config_byte(gx_params->cs55x0, reg, value); -} - -/** - * gx_detect_chipset: - * - **/ -static __init struct pci_dev *gx_detect_chipset(void) -{ - struct pci_dev *gx_pci = NULL; - - /* check if CPU is a MediaGX or a Geode. */ - if ((boot_cpu_data.x86_vendor != X86_VENDOR_NSC) && - (boot_cpu_data.x86_vendor != X86_VENDOR_CYRIX)) { - dprintk("error: no MediaGX/Geode processor found!\n"); - return NULL; - } - - /* detect which companion chip is used */ - for_each_pci_dev(gx_pci) { - if ((pci_match_id(gx_chipset_tbl, gx_pci)) != NULL) - return gx_pci; - } - - dprintk("error: no supported chipset found!\n"); - return NULL; -} - -/** - * gx_get_cpuspeed: - * - * Finds out at which efficient frequency the Cyrix MediaGX/NatSemi - * Geode CPU runs. - */ -static unsigned int gx_get_cpuspeed(unsigned int cpu) -{ - if ((gx_params->pci_suscfg & SUSMOD) == 0) - return stock_freq; - - return (stock_freq * gx_params->off_duration) - / (gx_params->on_duration + gx_params->off_duration); -} - -/** - * gx_validate_speed: - * determine current cpu speed - * - **/ - -static unsigned int gx_validate_speed(unsigned int khz, u8 *on_duration, - u8 *off_duration) -{ - unsigned int i; - u8 tmp_on, tmp_off; - int old_tmp_freq = stock_freq; - int tmp_freq; - - *off_duration = 1; - *on_duration = 0; - - for (i = max_duration; i > 0; i--) { - tmp_off = ((khz * i) / stock_freq) & 0xff; - tmp_on = i - tmp_off; - tmp_freq = (stock_freq * tmp_off) / i; - /* if this relation is closer to khz, use this. If it's equal, - * prefer it, too - lower latency */ - if (abs(tmp_freq - khz) <= abs(old_tmp_freq - khz)) { - *on_duration = tmp_on; - *off_duration = tmp_off; - old_tmp_freq = tmp_freq; - } - } - - return old_tmp_freq; -} - - -/** - * gx_set_cpuspeed: - * set cpu speed in khz. - **/ - -static void gx_set_cpuspeed(unsigned int khz) -{ - u8 suscfg, pmer1; - unsigned int new_khz; - unsigned long flags; - struct cpufreq_freqs freqs; - - freqs.cpu = 0; - freqs.old = gx_get_cpuspeed(0); - - new_khz = gx_validate_speed(khz, &gx_params->on_duration, - &gx_params->off_duration); - - freqs.new = new_khz; - - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - local_irq_save(flags); - - - - if (new_khz != stock_freq) { - /* if new khz == 100% of CPU speed, it is special case */ - switch (gx_params->cs55x0->device) { - case PCI_DEVICE_ID_CYRIX_5530_LEGACY: - pmer1 = gx_params->pci_pmer1 | IRQ_SPDUP | VID_SPDUP; - /* FIXME: need to test other values -- Zwane,Miura */ - /* typical 2 to 4ms */ - gx_write_byte(PCI_IRQTC, 4); - /* typical 50 to 100ms */ - gx_write_byte(PCI_VIDTC, 100); - gx_write_byte(PCI_PMER1, pmer1); - - if (gx_params->cs55x0->revision < 0x10) { - /* CS5530(rev 1.2, 1.3) */ - suscfg = gx_params->pci_suscfg|SUSMOD; - } else { - /* CS5530A,B.. */ - suscfg = gx_params->pci_suscfg|SUSMOD|PWRSVE; - } - break; - case PCI_DEVICE_ID_CYRIX_5520: - case PCI_DEVICE_ID_CYRIX_5510: - suscfg = gx_params->pci_suscfg | SUSMOD; - break; - default: - local_irq_restore(flags); - dprintk("fatal: try to set unknown chipset.\n"); - return; - } - } else { - suscfg = gx_params->pci_suscfg & ~(SUSMOD); - gx_params->off_duration = 0; - gx_params->on_duration = 0; - dprintk("suspend modulation disabled: cpu runs 100%% speed.\n"); - } - - gx_write_byte(PCI_MODOFF, gx_params->off_duration); - gx_write_byte(PCI_MODON, gx_params->on_duration); - - gx_write_byte(PCI_SUSCFG, suscfg); - pci_read_config_byte(gx_params->cs55x0, PCI_SUSCFG, &suscfg); - - local_irq_restore(flags); - - gx_params->pci_suscfg = suscfg; - - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - dprintk("suspend modulation w/ duration of ON:%d us, OFF:%d us\n", - gx_params->on_duration * 32, gx_params->off_duration * 32); - dprintk("suspend modulation w/ clock speed: %d kHz.\n", freqs.new); -} - -/**************************************************************** - * High level functions * - ****************************************************************/ - -/* - * cpufreq_gx_verify: test if frequency range is valid - * - * This function checks if a given frequency range in kHz is valid - * for the hardware supported by the driver. - */ - -static int cpufreq_gx_verify(struct cpufreq_policy *policy) -{ - unsigned int tmp_freq = 0; - u8 tmp1, tmp2; - - if (!stock_freq || !policy) - return -EINVAL; - - policy->cpu = 0; - cpufreq_verify_within_limits(policy, (stock_freq / max_duration), - stock_freq); - - /* it needs to be assured that at least one supported frequency is - * within policy->min and policy->max. If it is not, policy->max - * needs to be increased until one freuqency is supported. - * policy->min may not be decreased, though. This way we guarantee a - * specific processing capacity. - */ - tmp_freq = gx_validate_speed(policy->min, &tmp1, &tmp2); - if (tmp_freq < policy->min) - tmp_freq += stock_freq / max_duration; - policy->min = tmp_freq; - if (policy->min > policy->max) - policy->max = tmp_freq; - tmp_freq = gx_validate_speed(policy->max, &tmp1, &tmp2); - if (tmp_freq > policy->max) - tmp_freq -= stock_freq / max_duration; - policy->max = tmp_freq; - if (policy->max < policy->min) - policy->max = policy->min; - cpufreq_verify_within_limits(policy, (stock_freq / max_duration), - stock_freq); - - return 0; -} - -/* - * cpufreq_gx_target: - * - */ -static int cpufreq_gx_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - u8 tmp1, tmp2; - unsigned int tmp_freq; - - if (!stock_freq || !policy) - return -EINVAL; - - policy->cpu = 0; - - tmp_freq = gx_validate_speed(target_freq, &tmp1, &tmp2); - while (tmp_freq < policy->min) { - tmp_freq += stock_freq / max_duration; - tmp_freq = gx_validate_speed(tmp_freq, &tmp1, &tmp2); - } - while (tmp_freq > policy->max) { - tmp_freq -= stock_freq / max_duration; - tmp_freq = gx_validate_speed(tmp_freq, &tmp1, &tmp2); - } - - gx_set_cpuspeed(tmp_freq); - - return 0; -} - -static int cpufreq_gx_cpu_init(struct cpufreq_policy *policy) -{ - unsigned int maxfreq, curfreq; - - if (!policy || policy->cpu != 0) - return -ENODEV; - - /* determine maximum frequency */ - if (pci_busclk) - maxfreq = pci_busclk * gx_freq_mult[getCx86(CX86_DIR1) & 0x0f]; - else if (cpu_khz) - maxfreq = cpu_khz; - else - maxfreq = 30000 * gx_freq_mult[getCx86(CX86_DIR1) & 0x0f]; - - stock_freq = maxfreq; - curfreq = gx_get_cpuspeed(0); - - dprintk("cpu max frequency is %d.\n", maxfreq); - dprintk("cpu current frequency is %dkHz.\n", curfreq); - - /* setup basic struct for cpufreq API */ - policy->cpu = 0; - - if (max_duration < POLICY_MIN_DIV) - policy->min = maxfreq / max_duration; - else - policy->min = maxfreq / POLICY_MIN_DIV; - policy->max = maxfreq; - policy->cur = curfreq; - policy->cpuinfo.min_freq = maxfreq / max_duration; - policy->cpuinfo.max_freq = maxfreq; - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; - - return 0; -} - -/* - * cpufreq_gx_init: - * MediaGX/Geode GX initialize cpufreq driver - */ -static struct cpufreq_driver gx_suspmod_driver = { - .get = gx_get_cpuspeed, - .verify = cpufreq_gx_verify, - .target = cpufreq_gx_target, - .init = cpufreq_gx_cpu_init, - .name = "gx-suspmod", - .owner = THIS_MODULE, -}; - -static int __init cpufreq_gx_init(void) -{ - int ret; - struct gxfreq_params *params; - struct pci_dev *gx_pci; - - /* Test if we have the right hardware */ - gx_pci = gx_detect_chipset(); - if (gx_pci == NULL) - return -ENODEV; - - /* check whether module parameters are sane */ - if (max_duration > 0xff) - max_duration = 0xff; - - dprintk("geode suspend modulation available.\n"); - - params = kzalloc(sizeof(struct gxfreq_params), GFP_KERNEL); - if (params == NULL) - return -ENOMEM; - - params->cs55x0 = gx_pci; - gx_params = params; - - /* keep cs55x0 configurations */ - pci_read_config_byte(params->cs55x0, PCI_SUSCFG, &(params->pci_suscfg)); - pci_read_config_byte(params->cs55x0, PCI_PMER1, &(params->pci_pmer1)); - pci_read_config_byte(params->cs55x0, PCI_PMER2, &(params->pci_pmer2)); - pci_read_config_byte(params->cs55x0, PCI_MODON, &(params->on_duration)); - pci_read_config_byte(params->cs55x0, PCI_MODOFF, - &(params->off_duration)); - - ret = cpufreq_register_driver(&gx_suspmod_driver); - if (ret) { - kfree(params); - return ret; /* register error! */ - } - - return 0; -} - -static void __exit cpufreq_gx_exit(void) -{ - cpufreq_unregister_driver(&gx_suspmod_driver); - pci_dev_put(gx_params->cs55x0); - kfree(gx_params); -} - -MODULE_AUTHOR("Hiroshi Miura <miura@da-cha.org>"); -MODULE_DESCRIPTION("Cpufreq driver for Cyrix MediaGX and NatSemi Geode"); -MODULE_LICENSE("GPL"); - -module_init(cpufreq_gx_init); -module_exit(cpufreq_gx_exit); - |