From: Viresh Kumar Date: Thu, 4 Apr 2013 12:54:13 +0000 (+0000) Subject: cpufreq: pxa2xx: move cpufreq driver to drivers/cpufreq X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=cffc96eb4f91ba0f974b352a28b15f84950bd776;p=openwrt%2Fstaging%2Fblogic.git cpufreq: pxa2xx: move cpufreq driver to drivers/cpufreq This patch moves cpufreq driver of ARM based pxa2xx platform to drivers/cpufreq. Signed-off-by: Viresh Kumar Acked-by: Eric Miao Acked-by: Arnd Bergmann Signed-off-by: Rafael J. Wysocki --- diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 13b739469c51..76eb836793a1 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -2177,13 +2177,6 @@ config CPU_FREQ_INTEGRATOR If in doubt, say Y. -config CPU_FREQ_PXA - bool - depends on CPU_FREQ && ARCH_PXA && PXA25x - default y - select CPU_FREQ_DEFAULT_GOV_USERSPACE - select CPU_FREQ_TABLE - config CPU_FREQ_S3C bool help diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile index 929e7008e2e4..648867a8caa8 100644 --- a/arch/arm/mach-pxa/Makefile +++ b/arch/arm/mach-pxa/Makefile @@ -7,11 +7,6 @@ obj-y += clock.o devices.o generic.o irq.o \ time.o reset.o obj-$(CONFIG_PM) += pm.o sleep.o standby.o -ifeq ($(CONFIG_CPU_FREQ),y) -obj-$(CONFIG_PXA25x) += cpufreq-pxa2xx.o -obj-$(CONFIG_PXA27x) += cpufreq-pxa2xx.o -endif - # Generic drivers that other drivers may depend upon # SoC-specific code diff --git a/arch/arm/mach-pxa/cpufreq-pxa2xx.c b/arch/arm/mach-pxa/cpufreq-pxa2xx.c deleted file mode 100644 index f1ca4daa1ad6..000000000000 --- a/arch/arm/mach-pxa/cpufreq-pxa2xx.c +++ /dev/null @@ -1,493 +0,0 @@ -/* - * linux/arch/arm/mach-pxa/cpufreq-pxa2xx.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 -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#ifdef DEBUG -static unsigned int freq_debug; -module_param(freq_debug, uint, 0); -MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0"); -#else -#define freq_debug 0 -#endif - -static struct regulator *vcc_core; - -static unsigned int pxa27x_maxfreq; -module_param(pxa27x_maxfreq, uint, 0); -MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz" - "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)"); - -typedef struct { - unsigned int khz; - unsigned int membus; - unsigned int cccr; - unsigned int div2; - unsigned int cclkcfg; - int vmin; - int vmax; -} pxa_freqs_t; - -/* Define the refresh period in mSec for the SDRAM and the number of rows */ -#define SDRAM_TREF 64 /* standard 64ms SDRAM */ -static unsigned int sdram_rows; - -#define CCLKCFG_TURBO 0x1 -#define CCLKCFG_FCS 0x2 -#define CCLKCFG_HALFTURBO 0x4 -#define CCLKCFG_FASTBUS 0x8 -#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2) -#define MDREFR_DRI_MASK 0xFFF - -#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3) -#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3) - -/* - * PXA255 definitions - */ -/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */ -#define CCLKCFG CCLKCFG_TURBO | CCLKCFG_FCS - -static pxa_freqs_t pxa255_run_freqs[] = -{ - /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */ - { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */ - {132700, 132700, 0x123, 1, CCLKCFG, -1, -1}, /* 133, 133, 66, 66 */ - {199100, 99500, 0x141, 0, CCLKCFG, -1, -1}, /* 199, 199, 99, 99 */ - {265400, 132700, 0x143, 1, CCLKCFG, -1, -1}, /* 265, 265, 133, 66 */ - {331800, 165900, 0x145, 1, CCLKCFG, -1, -1}, /* 331, 331, 166, 83 */ - {398100, 99500, 0x161, 0, CCLKCFG, -1, -1}, /* 398, 398, 196, 99 */ -}; - -/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */ -static pxa_freqs_t pxa255_turbo_freqs[] = -{ - /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */ - { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */ - {199100, 99500, 0x221, 0, CCLKCFG, -1, -1}, /* 99, 199, 50, 99 */ - {298500, 99500, 0x321, 0, CCLKCFG, -1, -1}, /* 99, 287, 50, 99 */ - {298600, 99500, 0x1c1, 0, CCLKCFG, -1, -1}, /* 199, 287, 99, 99 */ - {398100, 99500, 0x241, 0, CCLKCFG, -1, -1}, /* 199, 398, 99, 99 */ -}; - -#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs) -#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs) - -static struct cpufreq_frequency_table - pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1]; -static struct cpufreq_frequency_table - pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1]; - -static unsigned int pxa255_turbo_table; -module_param(pxa255_turbo_table, uint, 0); -MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)"); - -/* - * PXA270 definitions - * - * For the PXA27x: - * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG. - * - * A = 0 => memory controller clock from table 3-7, - * A = 1 => memory controller clock = system bus clock - * Run mode frequency = 13 MHz * L - * Turbo mode frequency = 13 MHz * L * N - * System bus frequency = 13 MHz * L / (B + 1) - * - * In CCCR: - * A = 1 - * L = 16 oscillator to run mode ratio - * 2N = 6 2 * (turbo mode to run mode ratio) - * - * In CCLKCFG: - * B = 1 Fast bus mode - * HT = 0 Half-Turbo mode - * T = 1 Turbo mode - * - * For now, just support some of the combinations in table 3-7 of - * PXA27x Processor Family Developer's Manual to simplify frequency - * change sequences. - */ -#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L) -#define CCLKCFG2(B, HT, T) \ - (CCLKCFG_FCS | \ - ((B) ? CCLKCFG_FASTBUS : 0) | \ - ((HT) ? CCLKCFG_HALFTURBO : 0) | \ - ((T) ? CCLKCFG_TURBO : 0)) - -static pxa_freqs_t pxa27x_freqs[] = { - {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1), 900000, 1705000 }, - {156000, 104000, PXA27x_CCCR(1, 8, 3), 0, CCLKCFG2(1, 0, 1), 1000000, 1705000 }, - {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 }, - {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 }, - {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 }, - {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 }, - {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 } -}; - -#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs) -static struct cpufreq_frequency_table - pxa27x_freq_table[NUM_PXA27x_FREQS+1]; - -extern unsigned get_clk_frequency_khz(int info); - -#ifdef CONFIG_REGULATOR - -static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq) -{ - int ret = 0; - int vmin, vmax; - - if (!cpu_is_pxa27x()) - return 0; - - vmin = pxa_freq->vmin; - vmax = pxa_freq->vmax; - if ((vmin == -1) || (vmax == -1)) - return 0; - - ret = regulator_set_voltage(vcc_core, vmin, vmax); - if (ret) - pr_err("cpufreq: Failed to set vcc_core in [%dmV..%dmV]\n", - vmin, vmax); - return ret; -} - -static __init void pxa_cpufreq_init_voltages(void) -{ - vcc_core = regulator_get(NULL, "vcc_core"); - if (IS_ERR(vcc_core)) { - pr_info("cpufreq: Didn't find vcc_core regulator\n"); - vcc_core = NULL; - } else { - pr_info("cpufreq: Found vcc_core regulator\n"); - } -} -#else -static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq) -{ - return 0; -} - -static __init void pxa_cpufreq_init_voltages(void) { } -#endif - -static void find_freq_tables(struct cpufreq_frequency_table **freq_table, - pxa_freqs_t **pxa_freqs) -{ - if (cpu_is_pxa25x()) { - if (!pxa255_turbo_table) { - *pxa_freqs = pxa255_run_freqs; - *freq_table = pxa255_run_freq_table; - } else { - *pxa_freqs = pxa255_turbo_freqs; - *freq_table = pxa255_turbo_freq_table; - } - } - if (cpu_is_pxa27x()) { - *pxa_freqs = pxa27x_freqs; - *freq_table = pxa27x_freq_table; - } -} - -static void pxa27x_guess_max_freq(void) -{ - if (!pxa27x_maxfreq) { - pxa27x_maxfreq = 416000; - printk(KERN_INFO "PXA CPU 27x max frequency not defined " - "(pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n", - pxa27x_maxfreq); - } else { - pxa27x_maxfreq *= 1000; - } -} - -static void init_sdram_rows(void) -{ - uint32_t mdcnfg = __raw_readl(MDCNFG); - unsigned int drac2 = 0, drac0 = 0; - - if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3)) - drac2 = MDCNFG_DRAC2(mdcnfg); - - if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1)) - drac0 = MDCNFG_DRAC0(mdcnfg); - - sdram_rows = 1 << (11 + max(drac0, drac2)); -} - -static u32 mdrefr_dri(unsigned int freq) -{ - u32 interval = freq * SDRAM_TREF / sdram_rows; - - return (interval - (cpu_is_pxa27x() ? 31 : 0)) / 32; -} - -/* find a valid frequency point */ -static int pxa_verify_policy(struct cpufreq_policy *policy) -{ - struct cpufreq_frequency_table *pxa_freqs_table; - pxa_freqs_t *pxa_freqs; - int ret; - - find_freq_tables(&pxa_freqs_table, &pxa_freqs); - ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table); - - if (freq_debug) - pr_debug("Verified CPU policy: %dKhz min to %dKhz max\n", - policy->min, policy->max); - - return ret; -} - -static unsigned int pxa_cpufreq_get(unsigned int cpu) -{ - return get_clk_frequency_khz(0); -} - -static int pxa_set_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - struct cpufreq_frequency_table *pxa_freqs_table; - pxa_freqs_t *pxa_freq_settings; - struct cpufreq_freqs freqs; - unsigned int idx; - unsigned long flags; - unsigned int new_freq_cpu, new_freq_mem; - unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg; - int ret = 0; - - /* Get the current policy */ - find_freq_tables(&pxa_freqs_table, &pxa_freq_settings); - - /* Lookup the next frequency */ - if (cpufreq_frequency_table_target(policy, pxa_freqs_table, - target_freq, relation, &idx)) { - return -EINVAL; - } - - new_freq_cpu = pxa_freq_settings[idx].khz; - new_freq_mem = pxa_freq_settings[idx].membus; - freqs.old = policy->cur; - freqs.new = new_freq_cpu; - - if (freq_debug) - pr_debug("Changing CPU frequency to %d Mhz, (SDRAM %d Mhz)\n", - freqs.new / 1000, (pxa_freq_settings[idx].div2) ? - (new_freq_mem / 2000) : (new_freq_mem / 1000)); - - if (vcc_core && freqs.new > freqs.old) - ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); - if (ret) - return ret; - /* - * Tell everyone what we're about to do... - * you should add a notify client with any platform specific - * Vcc changing capability - */ - cpufreq_notify_transition(policy, &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 = __raw_readl(MDREFR); - if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) { - preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK); - preset_mdrefr |= mdrefr_dri(new_freq_mem); - } - postset_mdrefr = - (postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem); - - /* 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 and prepare CCLKCFG */ - CCCR = pxa_freq_settings[idx].cccr; - cclkcfg = pxa_freq_settings[idx].cclkcfg; - - asm volatile(" \n\ - ldr r4, [%1] /* load MDREFR */ \n\ - b 2f \n\ - .align 5 \n\ -1: \n\ - str %3, [%1] /* preset the MDREFR */ \n\ - mcr p14, 0, %2, c6, c0, 0 /* set CCLKCFG[FCS] */ \n\ - str %4, [%1] /* postset the MDREFR */ \n\ - \n\ - b 3f \n\ -2: b 1b \n\ -3: nop \n\ - " - : "=&r" (unused) - : "r" (MDREFR), "r" (cclkcfg), - "r" (preset_mdrefr), "r" (postset_mdrefr) - : "r4", "r5"); - local_irq_restore(flags); - - /* - * Tell everyone what we've just done... - * you should add a notify client with any platform specific - * SDRAM refresh timer adjustments - */ - cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); - - /* - * Even if voltage setting fails, we don't report it, as the frequency - * change succeeded. The voltage reduction is not a critical failure, - * only power savings will suffer from this. - * - * Note: if the voltage change fails, and a return value is returned, a - * bug is triggered (seems a deadlock). Should anybody find out where, - * the "return 0" should become a "return ret". - */ - if (vcc_core && freqs.new < freqs.old) - ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); - - return 0; -} - -static int pxa_cpufreq_init(struct cpufreq_policy *policy) -{ - int i; - unsigned int freq; - struct cpufreq_frequency_table *pxa255_freq_table; - pxa_freqs_t *pxa255_freqs; - - /* try to guess pxa27x cpu */ - if (cpu_is_pxa27x()) - pxa27x_guess_max_freq(); - - pxa_cpufreq_init_voltages(); - - init_sdram_rows(); - - /* set default policy and cpuinfo */ - 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 pxa25x the run cpufreq_frequency_table struct */ - for (i = 0; i < NUM_PXA25x_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 pxa25x the turbo cpufreq_frequency_table struct */ - for (i = 0; i < NUM_PXA25x_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; - - pxa255_turbo_table = !!pxa255_turbo_table; - - /* Generate the pxa27x cpufreq_frequency_table struct */ - for (i = 0; i < NUM_PXA27x_FREQS; i++) { - freq = pxa27x_freqs[i].khz; - if (freq > pxa27x_maxfreq) - break; - pxa27x_freq_table[i].frequency = freq; - pxa27x_freq_table[i].index = i; - } - pxa27x_freq_table[i].index = i; - pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END; - - /* - * Set the policy's minimum and maximum frequencies from the tables - * just constructed. This sets cpuinfo.mxx_freq, min and max. - */ - if (cpu_is_pxa25x()) { - find_freq_tables(&pxa255_freq_table, &pxa255_freqs); - pr_info("PXA255 cpufreq using %s frequency table\n", - pxa255_turbo_table ? "turbo" : "run"); - cpufreq_frequency_table_cpuinfo(policy, pxa255_freq_table); - } - else if (cpu_is_pxa27x()) - cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table); - - 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, - .get = pxa_cpufreq_get, - .name = "PXA2xx", -}; - -static int __init pxa_cpu_init(void) -{ - int ret = -ENODEV; - if (cpu_is_pxa25x() || cpu_is_pxa27x()) - ret = cpufreq_register_driver(&pxa_cpufreq_driver); - return ret; -} - -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 --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index 3458bf2ed1bb..aa766fb85513 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -59,6 +59,8 @@ obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ) += highbank-cpufreq.o obj-$(CONFIG_ARM_IMX6Q_CPUFREQ) += imx6q-cpufreq.o obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ) += kirkwood-cpufreq.o obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o +obj-$(CONFIG_PXA25x) += pxa2xx-cpufreq.o +obj-$(CONFIG_PXA27x) += pxa2xx-cpufreq.o obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o obj-$(CONFIG_ARM_S3C64XX_CPUFREQ) += s3c64xx-cpufreq.o diff --git a/drivers/cpufreq/pxa2xx-cpufreq.c b/drivers/cpufreq/pxa2xx-cpufreq.c new file mode 100644 index 000000000000..fe4c55b38ec3 --- /dev/null +++ b/drivers/cpufreq/pxa2xx-cpufreq.c @@ -0,0 +1,491 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#ifdef DEBUG +static unsigned int freq_debug; +module_param(freq_debug, uint, 0); +MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0"); +#else +#define freq_debug 0 +#endif + +static struct regulator *vcc_core; + +static unsigned int pxa27x_maxfreq; +module_param(pxa27x_maxfreq, uint, 0); +MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz" + "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)"); + +typedef struct { + unsigned int khz; + unsigned int membus; + unsigned int cccr; + unsigned int div2; + unsigned int cclkcfg; + int vmin; + int vmax; +} pxa_freqs_t; + +/* Define the refresh period in mSec for the SDRAM and the number of rows */ +#define SDRAM_TREF 64 /* standard 64ms SDRAM */ +static unsigned int sdram_rows; + +#define CCLKCFG_TURBO 0x1 +#define CCLKCFG_FCS 0x2 +#define CCLKCFG_HALFTURBO 0x4 +#define CCLKCFG_FASTBUS 0x8 +#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2) +#define MDREFR_DRI_MASK 0xFFF + +#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3) +#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3) + +/* + * PXA255 definitions + */ +/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */ +#define CCLKCFG CCLKCFG_TURBO | CCLKCFG_FCS + +static pxa_freqs_t pxa255_run_freqs[] = +{ + /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */ + { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */ + {132700, 132700, 0x123, 1, CCLKCFG, -1, -1}, /* 133, 133, 66, 66 */ + {199100, 99500, 0x141, 0, CCLKCFG, -1, -1}, /* 199, 199, 99, 99 */ + {265400, 132700, 0x143, 1, CCLKCFG, -1, -1}, /* 265, 265, 133, 66 */ + {331800, 165900, 0x145, 1, CCLKCFG, -1, -1}, /* 331, 331, 166, 83 */ + {398100, 99500, 0x161, 0, CCLKCFG, -1, -1}, /* 398, 398, 196, 99 */ +}; + +/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */ +static pxa_freqs_t pxa255_turbo_freqs[] = +{ + /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */ + { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */ + {199100, 99500, 0x221, 0, CCLKCFG, -1, -1}, /* 99, 199, 50, 99 */ + {298500, 99500, 0x321, 0, CCLKCFG, -1, -1}, /* 99, 287, 50, 99 */ + {298600, 99500, 0x1c1, 0, CCLKCFG, -1, -1}, /* 199, 287, 99, 99 */ + {398100, 99500, 0x241, 0, CCLKCFG, -1, -1}, /* 199, 398, 99, 99 */ +}; + +#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs) +#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs) + +static struct cpufreq_frequency_table + pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1]; +static struct cpufreq_frequency_table + pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1]; + +static unsigned int pxa255_turbo_table; +module_param(pxa255_turbo_table, uint, 0); +MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)"); + +/* + * PXA270 definitions + * + * For the PXA27x: + * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG. + * + * A = 0 => memory controller clock from table 3-7, + * A = 1 => memory controller clock = system bus clock + * Run mode frequency = 13 MHz * L + * Turbo mode frequency = 13 MHz * L * N + * System bus frequency = 13 MHz * L / (B + 1) + * + * In CCCR: + * A = 1 + * L = 16 oscillator to run mode ratio + * 2N = 6 2 * (turbo mode to run mode ratio) + * + * In CCLKCFG: + * B = 1 Fast bus mode + * HT = 0 Half-Turbo mode + * T = 1 Turbo mode + * + * For now, just support some of the combinations in table 3-7 of + * PXA27x Processor Family Developer's Manual to simplify frequency + * change sequences. + */ +#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L) +#define CCLKCFG2(B, HT, T) \ + (CCLKCFG_FCS | \ + ((B) ? CCLKCFG_FASTBUS : 0) | \ + ((HT) ? CCLKCFG_HALFTURBO : 0) | \ + ((T) ? CCLKCFG_TURBO : 0)) + +static pxa_freqs_t pxa27x_freqs[] = { + {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1), 900000, 1705000 }, + {156000, 104000, PXA27x_CCCR(1, 8, 3), 0, CCLKCFG2(1, 0, 1), 1000000, 1705000 }, + {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 }, + {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 }, + {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 }, + {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 }, + {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 } +}; + +#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs) +static struct cpufreq_frequency_table + pxa27x_freq_table[NUM_PXA27x_FREQS+1]; + +extern unsigned get_clk_frequency_khz(int info); + +#ifdef CONFIG_REGULATOR + +static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq) +{ + int ret = 0; + int vmin, vmax; + + if (!cpu_is_pxa27x()) + return 0; + + vmin = pxa_freq->vmin; + vmax = pxa_freq->vmax; + if ((vmin == -1) || (vmax == -1)) + return 0; + + ret = regulator_set_voltage(vcc_core, vmin, vmax); + if (ret) + pr_err("cpufreq: Failed to set vcc_core in [%dmV..%dmV]\n", + vmin, vmax); + return ret; +} + +static __init void pxa_cpufreq_init_voltages(void) +{ + vcc_core = regulator_get(NULL, "vcc_core"); + if (IS_ERR(vcc_core)) { + pr_info("cpufreq: Didn't find vcc_core regulator\n"); + vcc_core = NULL; + } else { + pr_info("cpufreq: Found vcc_core regulator\n"); + } +} +#else +static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq) +{ + return 0; +} + +static __init void pxa_cpufreq_init_voltages(void) { } +#endif + +static void find_freq_tables(struct cpufreq_frequency_table **freq_table, + pxa_freqs_t **pxa_freqs) +{ + if (cpu_is_pxa25x()) { + if (!pxa255_turbo_table) { + *pxa_freqs = pxa255_run_freqs; + *freq_table = pxa255_run_freq_table; + } else { + *pxa_freqs = pxa255_turbo_freqs; + *freq_table = pxa255_turbo_freq_table; + } + } + if (cpu_is_pxa27x()) { + *pxa_freqs = pxa27x_freqs; + *freq_table = pxa27x_freq_table; + } +} + +static void pxa27x_guess_max_freq(void) +{ + if (!pxa27x_maxfreq) { + pxa27x_maxfreq = 416000; + printk(KERN_INFO "PXA CPU 27x max frequency not defined " + "(pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n", + pxa27x_maxfreq); + } else { + pxa27x_maxfreq *= 1000; + } +} + +static void init_sdram_rows(void) +{ + uint32_t mdcnfg = __raw_readl(MDCNFG); + unsigned int drac2 = 0, drac0 = 0; + + if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3)) + drac2 = MDCNFG_DRAC2(mdcnfg); + + if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1)) + drac0 = MDCNFG_DRAC0(mdcnfg); + + sdram_rows = 1 << (11 + max(drac0, drac2)); +} + +static u32 mdrefr_dri(unsigned int freq) +{ + u32 interval = freq * SDRAM_TREF / sdram_rows; + + return (interval - (cpu_is_pxa27x() ? 31 : 0)) / 32; +} + +/* find a valid frequency point */ +static int pxa_verify_policy(struct cpufreq_policy *policy) +{ + struct cpufreq_frequency_table *pxa_freqs_table; + pxa_freqs_t *pxa_freqs; + int ret; + + find_freq_tables(&pxa_freqs_table, &pxa_freqs); + ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table); + + if (freq_debug) + pr_debug("Verified CPU policy: %dKhz min to %dKhz max\n", + policy->min, policy->max); + + return ret; +} + +static unsigned int pxa_cpufreq_get(unsigned int cpu) +{ + return get_clk_frequency_khz(0); +} + +static int pxa_set_target(struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation) +{ + struct cpufreq_frequency_table *pxa_freqs_table; + pxa_freqs_t *pxa_freq_settings; + struct cpufreq_freqs freqs; + unsigned int idx; + unsigned long flags; + unsigned int new_freq_cpu, new_freq_mem; + unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg; + int ret = 0; + + /* Get the current policy */ + find_freq_tables(&pxa_freqs_table, &pxa_freq_settings); + + /* Lookup the next frequency */ + if (cpufreq_frequency_table_target(policy, pxa_freqs_table, + target_freq, relation, &idx)) { + return -EINVAL; + } + + new_freq_cpu = pxa_freq_settings[idx].khz; + new_freq_mem = pxa_freq_settings[idx].membus; + freqs.old = policy->cur; + freqs.new = new_freq_cpu; + + if (freq_debug) + pr_debug("Changing CPU frequency to %d Mhz, (SDRAM %d Mhz)\n", + freqs.new / 1000, (pxa_freq_settings[idx].div2) ? + (new_freq_mem / 2000) : (new_freq_mem / 1000)); + + if (vcc_core && freqs.new > freqs.old) + ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); + if (ret) + return ret; + /* + * Tell everyone what we're about to do... + * you should add a notify client with any platform specific + * Vcc changing capability + */ + cpufreq_notify_transition(policy, &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 = __raw_readl(MDREFR); + if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) { + preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK); + preset_mdrefr |= mdrefr_dri(new_freq_mem); + } + postset_mdrefr = + (postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem); + + /* 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 and prepare CCLKCFG */ + CCCR = pxa_freq_settings[idx].cccr; + cclkcfg = pxa_freq_settings[idx].cclkcfg; + + asm volatile(" \n\ + ldr r4, [%1] /* load MDREFR */ \n\ + b 2f \n\ + .align 5 \n\ +1: \n\ + str %3, [%1] /* preset the MDREFR */ \n\ + mcr p14, 0, %2, c6, c0, 0 /* set CCLKCFG[FCS] */ \n\ + str %4, [%1] /* postset the MDREFR */ \n\ + \n\ + b 3f \n\ +2: b 1b \n\ +3: nop \n\ + " + : "=&r" (unused) + : "r" (MDREFR), "r" (cclkcfg), + "r" (preset_mdrefr), "r" (postset_mdrefr) + : "r4", "r5"); + local_irq_restore(flags); + + /* + * Tell everyone what we've just done... + * you should add a notify client with any platform specific + * SDRAM refresh timer adjustments + */ + cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); + + /* + * Even if voltage setting fails, we don't report it, as the frequency + * change succeeded. The voltage reduction is not a critical failure, + * only power savings will suffer from this. + * + * Note: if the voltage change fails, and a return value is returned, a + * bug is triggered (seems a deadlock). Should anybody find out where, + * the "return 0" should become a "return ret". + */ + if (vcc_core && freqs.new < freqs.old) + ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); + + return 0; +} + +static int pxa_cpufreq_init(struct cpufreq_policy *policy) +{ + int i; + unsigned int freq; + struct cpufreq_frequency_table *pxa255_freq_table; + pxa_freqs_t *pxa255_freqs; + + /* try to guess pxa27x cpu */ + if (cpu_is_pxa27x()) + pxa27x_guess_max_freq(); + + pxa_cpufreq_init_voltages(); + + init_sdram_rows(); + + /* set default policy and cpuinfo */ + 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 pxa25x the run cpufreq_frequency_table struct */ + for (i = 0; i < NUM_PXA25x_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 pxa25x the turbo cpufreq_frequency_table struct */ + for (i = 0; i < NUM_PXA25x_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; + + pxa255_turbo_table = !!pxa255_turbo_table; + + /* Generate the pxa27x cpufreq_frequency_table struct */ + for (i = 0; i < NUM_PXA27x_FREQS; i++) { + freq = pxa27x_freqs[i].khz; + if (freq > pxa27x_maxfreq) + break; + pxa27x_freq_table[i].frequency = freq; + pxa27x_freq_table[i].index = i; + } + pxa27x_freq_table[i].index = i; + pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END; + + /* + * Set the policy's minimum and maximum frequencies from the tables + * just constructed. This sets cpuinfo.mxx_freq, min and max. + */ + if (cpu_is_pxa25x()) { + find_freq_tables(&pxa255_freq_table, &pxa255_freqs); + pr_info("PXA255 cpufreq using %s frequency table\n", + pxa255_turbo_table ? "turbo" : "run"); + cpufreq_frequency_table_cpuinfo(policy, pxa255_freq_table); + } + else if (cpu_is_pxa27x()) + cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table); + + 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, + .get = pxa_cpufreq_get, + .name = "PXA2xx", +}; + +static int __init pxa_cpu_init(void) +{ + int ret = -ENODEV; + if (cpu_is_pxa25x() || cpu_is_pxa27x()) + ret = cpufreq_register_driver(&pxa_cpufreq_driver); + return ret; +} + +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);