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cpufreq: elanfreq: Drop support for AMD Elan SC4*
Since commit 8b793a92d8 ("x86/cpu: Remove M486/M486SX/ELAN support"),
the AMD Elan SC4* is no longer supported, so the CPU frequency driver
is no longer needed.
Signed-off-by: Sean Young <sean@mess.org>
Reviewed-by: Zhongqiu Han <zhongqiu.han@oss.qualcomm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Changelog tweaks ]
Link: https://patch.msgid.link/20260507090107.10113-1-sean@mess.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sean Young
Rafael J. Wysocki
parent
7dd383dc66
commit
6fb302d210
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@ -1669,10 +1669,6 @@ Kernel parameters
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very early in the boot process. For early debugging
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via a serial port see kgdboc_earlycon instead.
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elanfreq= [X86-32]
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See comment before function elanfreq_setup() in
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arch/x86/kernel/cpu/cpufreq/elanfreq.c.
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elfcorehdr=[size[KMG]@]offset[KMG] [PPC,SH,X86,S390,EARLY]
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Specifies physical address of start of kernel core
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image elf header and optionally the size. Generally
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@ -113,21 +113,6 @@ config X86_ACPI_CPUFREQ_CPB
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By enabling this option the acpi_cpufreq driver provides the old
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entry in addition to the new boost ones, for compatibility reasons.
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config ELAN_CPUFREQ
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tristate "AMD Elan SC400 and SC410"
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depends on MELAN
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help
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This adds the CPUFreq driver for AMD Elan SC400 and SC410
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processors.
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You need to specify the processor maximum speed as boot
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parameter: elanfreq=maxspeed (in kHz) or as module
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parameter "max_freq".
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config SC520_CPUFREQ
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tristate "AMD Elan SC520"
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depends on MELAN
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@ -40,7 +40,6 @@ obj-$(CONFIG_X86_POWERNOW_K6) += powernow-k6.o
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obj-$(CONFIG_X86_POWERNOW_K7) += powernow-k7.o
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obj-$(CONFIG_X86_LONGHAUL) += longhaul.o
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obj-$(CONFIG_X86_E_POWERSAVER) += e_powersaver.o
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obj-$(CONFIG_ELAN_CPUFREQ) += elanfreq.o
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obj-$(CONFIG_SC520_CPUFREQ) += sc520_freq.o
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obj-$(CONFIG_X86_LONGRUN) += longrun.o
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obj-$(CONFIG_X86_GX_SUSPMOD) += gx-suspmod.o
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@ -1,226 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* elanfreq: cpufreq driver for the AMD ELAN family
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*
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* (c) Copyright 2002 Robert Schwebel <r.schwebel@pengutronix.de>
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*
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* Parts of this code are (c) Sven Geggus <sven@geggus.net>
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*
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* All Rights Reserved.
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*
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* 2002-02-13: - initial revision for 2.4.18-pre9 by Robert Schwebel
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/cpufreq.h>
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#include <asm/cpu_device_id.h>
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#include <linux/timex.h>
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#include <linux/io.h>
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#define REG_CSCIR 0x22 /* Chip Setup and Control Index Register */
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#define REG_CSCDR 0x23 /* Chip Setup and Control Data Register */
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/* Module parameter */
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static int max_freq;
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struct s_elan_multiplier {
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int clock; /* frequency in kHz */
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int val40h; /* PMU Force Mode register */
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int val80h; /* CPU Clock Speed Register */
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};
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/*
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* It is important that the frequencies
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* are listed in ascending order here!
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*/
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static struct s_elan_multiplier elan_multiplier[] = {
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{1000, 0x02, 0x18},
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{2000, 0x02, 0x10},
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{4000, 0x02, 0x08},
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{8000, 0x00, 0x00},
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{16000, 0x00, 0x02},
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{33000, 0x00, 0x04},
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{66000, 0x01, 0x04},
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{99000, 0x01, 0x05}
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};
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static struct cpufreq_frequency_table elanfreq_table[] = {
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{0, 0, 1000},
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{0, 1, 2000},
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{0, 2, 4000},
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{0, 3, 8000},
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{0, 4, 16000},
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{0, 5, 33000},
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{0, 6, 66000},
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{0, 7, 99000},
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{0, 0, CPUFREQ_TABLE_END},
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};
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/**
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* elanfreq_get_cpu_frequency: determine current cpu speed
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*
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* Finds out at which frequency the CPU of the Elan SOC runs
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* at the moment. Frequencies from 1 to 33 MHz are generated
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* the normal way, 66 and 99 MHz are called "Hyperspeed Mode"
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* and have the rest of the chip running with 33 MHz.
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*/
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static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu)
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{
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u8 clockspeed_reg; /* Clock Speed Register */
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local_irq_disable();
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outb_p(0x80, REG_CSCIR);
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clockspeed_reg = inb_p(REG_CSCDR);
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local_irq_enable();
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if ((clockspeed_reg & 0xE0) == 0xE0)
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return 0;
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/* Are we in CPU clock multiplied mode (66/99 MHz)? */
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if ((clockspeed_reg & 0xE0) == 0xC0) {
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if ((clockspeed_reg & 0x01) == 0)
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return 66000;
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else
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return 99000;
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}
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/* 33 MHz is not 32 MHz... */
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if ((clockspeed_reg & 0xE0) == 0xA0)
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return 33000;
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return (1<<((clockspeed_reg & 0xE0) >> 5)) * 1000;
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}
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static int elanfreq_target(struct cpufreq_policy *policy,
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unsigned int state)
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{
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/*
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* Access to the Elan's internal registers is indexed via
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* 0x22: Chip Setup & Control Register Index Register (CSCI)
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* 0x23: Chip Setup & Control Register Data Register (CSCD)
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*
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*/
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/*
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* 0x40 is the Power Management Unit's Force Mode Register.
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* Bit 6 enables Hyperspeed Mode (66/100 MHz core frequency)
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*/
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local_irq_disable();
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outb_p(0x40, REG_CSCIR); /* Disable hyperspeed mode */
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outb_p(0x00, REG_CSCDR);
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local_irq_enable(); /* wait till internal pipelines and */
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udelay(1000); /* buffers have cleaned up */
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local_irq_disable();
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/* now, set the CPU clock speed register (0x80) */
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outb_p(0x80, REG_CSCIR);
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outb_p(elan_multiplier[state].val80h, REG_CSCDR);
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/* now, the hyperspeed bit in PMU Force Mode Register (0x40) */
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outb_p(0x40, REG_CSCIR);
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outb_p(elan_multiplier[state].val40h, REG_CSCDR);
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udelay(10000);
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local_irq_enable();
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return 0;
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}
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/*
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* Module init and exit code
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*/
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static int elanfreq_cpu_init(struct cpufreq_policy *policy)
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{
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struct cpuinfo_x86 *c = &cpu_data(0);
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struct cpufreq_frequency_table *pos;
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/* capability check */
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if ((c->x86_vendor != X86_VENDOR_AMD) ||
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(c->x86 != 4) || (c->x86_model != 10))
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return -ENODEV;
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/* max freq */
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if (!max_freq)
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max_freq = elanfreq_get_cpu_frequency(0);
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/* table init */
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cpufreq_for_each_entry(pos, elanfreq_table)
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if (pos->frequency > max_freq)
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pos->frequency = CPUFREQ_ENTRY_INVALID;
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policy->freq_table = elanfreq_table;
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return 0;
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}
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#ifndef MODULE
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/**
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* elanfreq_setup - elanfreq command line parameter parsing
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*
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* elanfreq command line parameter. Use:
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* elanfreq=66000
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* to set the maximum CPU frequency to 66 MHz. Note that in
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* case you do not give this boot parameter, the maximum
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* frequency will fall back to _current_ CPU frequency which
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* might be lower. If you build this as a module, use the
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* max_freq module parameter instead.
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*/
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static int __init elanfreq_setup(char *str)
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{
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max_freq = simple_strtoul(str, &str, 0);
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pr_warn("You're using the deprecated elanfreq command line option. Use elanfreq.max_freq instead, please!\n");
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return 1;
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}
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__setup("elanfreq=", elanfreq_setup);
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#endif
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static struct cpufreq_driver elanfreq_driver = {
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.get = elanfreq_get_cpu_frequency,
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.flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
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.verify = cpufreq_generic_frequency_table_verify,
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.target_index = elanfreq_target,
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.init = elanfreq_cpu_init,
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.name = "elanfreq",
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};
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static const struct x86_cpu_id elan_id[] = {
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X86_MATCH_VENDOR_FAM_MODEL(AMD, 4, 10, NULL),
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, elan_id);
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static int __init elanfreq_init(void)
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{
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if (!x86_match_cpu(elan_id))
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return -ENODEV;
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return cpufreq_register_driver(&elanfreq_driver);
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}
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static void __exit elanfreq_exit(void)
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{
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cpufreq_unregister_driver(&elanfreq_driver);
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}
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module_param(max_freq, int, 0444);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Robert Schwebel <r.schwebel@pengutronix.de>, "
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"Sven Geggus <sven@geggus.net>");
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MODULE_DESCRIPTION("cpufreq driver for AMD's Elan CPUs");
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module_init(elanfreq_init);
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module_exit(elanfreq_exit);
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