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325 lines
8.7 KiB
325 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2002,2003 Intrinsyc Software |
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* |
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* History: |
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* 31-Jul-2002 : Initial version [FB] |
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* 29-Jan-2003 : added PXA255 support [FB] |
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* 20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.) |
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* |
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* Note: |
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* This driver may change the memory bus clock rate, but will not do any |
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* platform specific access timing changes... for example if you have flash |
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* memory connected to CS0, you will need to register a platform specific |
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* notifier which will adjust the memory access strobes to maintain a |
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* minimum strobe width. |
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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/sched.h> |
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#include <linux/init.h> |
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#include <linux/cpufreq.h> |
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#include <linux/err.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/io.h> |
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#include <mach/pxa2xx-regs.h> |
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#include <mach/smemc.h> |
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#ifdef DEBUG |
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static unsigned int freq_debug; |
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module_param(freq_debug, uint, 0); |
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MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0"); |
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#else |
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#define freq_debug 0 |
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#endif |
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static struct regulator *vcc_core; |
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static unsigned int pxa27x_maxfreq; |
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module_param(pxa27x_maxfreq, uint, 0); |
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MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz" |
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"(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)"); |
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struct pxa_cpufreq_data { |
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struct clk *clk_core; |
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}; |
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static struct pxa_cpufreq_data pxa_cpufreq_data; |
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struct pxa_freqs { |
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unsigned int khz; |
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int vmin; |
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int vmax; |
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}; |
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/* |
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* PXA255 definitions |
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*/ |
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static const struct pxa_freqs pxa255_run_freqs[] = |
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{ |
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/* CPU MEMBUS run turbo PXbus SDRAM */ |
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{ 99500, -1, -1}, /* 99, 99, 50, 50 */ |
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{132700, -1, -1}, /* 133, 133, 66, 66 */ |
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{199100, -1, -1}, /* 199, 199, 99, 99 */ |
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{265400, -1, -1}, /* 265, 265, 133, 66 */ |
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{331800, -1, -1}, /* 331, 331, 166, 83 */ |
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{398100, -1, -1}, /* 398, 398, 196, 99 */ |
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}; |
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/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */ |
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static const struct pxa_freqs pxa255_turbo_freqs[] = |
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{ |
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/* CPU run turbo PXbus SDRAM */ |
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{ 99500, -1, -1}, /* 99, 99, 50, 50 */ |
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{199100, -1, -1}, /* 99, 199, 50, 99 */ |
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{298500, -1, -1}, /* 99, 287, 50, 99 */ |
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{298600, -1, -1}, /* 199, 287, 99, 99 */ |
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{398100, -1, -1}, /* 199, 398, 99, 99 */ |
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}; |
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#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs) |
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#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs) |
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static struct cpufreq_frequency_table |
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pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1]; |
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static struct cpufreq_frequency_table |
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pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1]; |
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static unsigned int pxa255_turbo_table; |
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module_param(pxa255_turbo_table, uint, 0); |
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MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)"); |
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static struct pxa_freqs pxa27x_freqs[] = { |
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{104000, 900000, 1705000 }, |
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{156000, 1000000, 1705000 }, |
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{208000, 1180000, 1705000 }, |
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{312000, 1250000, 1705000 }, |
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{416000, 1350000, 1705000 }, |
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{520000, 1450000, 1705000 }, |
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{624000, 1550000, 1705000 } |
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}; |
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#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs) |
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static struct cpufreq_frequency_table |
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pxa27x_freq_table[NUM_PXA27x_FREQS+1]; |
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extern unsigned get_clk_frequency_khz(int info); |
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#ifdef CONFIG_REGULATOR |
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static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq) |
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{ |
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int ret = 0; |
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int vmin, vmax; |
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if (!cpu_is_pxa27x()) |
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return 0; |
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vmin = pxa_freq->vmin; |
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vmax = pxa_freq->vmax; |
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if ((vmin == -1) || (vmax == -1)) |
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return 0; |
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ret = regulator_set_voltage(vcc_core, vmin, vmax); |
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if (ret) |
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pr_err("Failed to set vcc_core in [%dmV..%dmV]\n", vmin, vmax); |
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return ret; |
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} |
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static void pxa_cpufreq_init_voltages(void) |
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{ |
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vcc_core = regulator_get(NULL, "vcc_core"); |
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if (IS_ERR(vcc_core)) { |
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pr_info("Didn't find vcc_core regulator\n"); |
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vcc_core = NULL; |
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} else { |
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pr_info("Found vcc_core regulator\n"); |
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} |
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} |
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#else |
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static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq) |
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{ |
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return 0; |
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} |
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static void pxa_cpufreq_init_voltages(void) { } |
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#endif |
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static void find_freq_tables(struct cpufreq_frequency_table **freq_table, |
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const struct pxa_freqs **pxa_freqs) |
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{ |
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if (cpu_is_pxa25x()) { |
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if (!pxa255_turbo_table) { |
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*pxa_freqs = pxa255_run_freqs; |
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*freq_table = pxa255_run_freq_table; |
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} else { |
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*pxa_freqs = pxa255_turbo_freqs; |
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*freq_table = pxa255_turbo_freq_table; |
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} |
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} else if (cpu_is_pxa27x()) { |
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*pxa_freqs = pxa27x_freqs; |
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*freq_table = pxa27x_freq_table; |
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} else { |
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BUG(); |
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} |
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} |
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static void pxa27x_guess_max_freq(void) |
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{ |
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if (!pxa27x_maxfreq) { |
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pxa27x_maxfreq = 416000; |
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pr_info("PXA CPU 27x max frequency not defined (pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n", |
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pxa27x_maxfreq); |
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} else { |
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pxa27x_maxfreq *= 1000; |
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} |
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} |
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static unsigned int pxa_cpufreq_get(unsigned int cpu) |
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{ |
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struct pxa_cpufreq_data *data = cpufreq_get_driver_data(); |
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return (unsigned int) clk_get_rate(data->clk_core) / 1000; |
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} |
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static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx) |
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{ |
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struct cpufreq_frequency_table *pxa_freqs_table; |
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const struct pxa_freqs *pxa_freq_settings; |
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struct pxa_cpufreq_data *data = cpufreq_get_driver_data(); |
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unsigned int new_freq_cpu; |
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int ret = 0; |
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/* Get the current policy */ |
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find_freq_tables(&pxa_freqs_table, &pxa_freq_settings); |
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new_freq_cpu = pxa_freq_settings[idx].khz; |
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if (freq_debug) |
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pr_debug("Changing CPU frequency from %d Mhz to %d Mhz\n", |
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policy->cur / 1000, new_freq_cpu / 1000); |
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if (vcc_core && new_freq_cpu > policy->cur) { |
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ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); |
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if (ret) |
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return ret; |
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} |
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clk_set_rate(data->clk_core, new_freq_cpu * 1000); |
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/* |
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* Even if voltage setting fails, we don't report it, as the frequency |
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* change succeeded. The voltage reduction is not a critical failure, |
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* only power savings will suffer from this. |
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* |
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* Note: if the voltage change fails, and a return value is returned, a |
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* bug is triggered (seems a deadlock). Should anybody find out where, |
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* the "return 0" should become a "return ret". |
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*/ |
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if (vcc_core && new_freq_cpu < policy->cur) |
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ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); |
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return 0; |
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} |
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static int pxa_cpufreq_init(struct cpufreq_policy *policy) |
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{ |
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int i; |
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unsigned int freq; |
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struct cpufreq_frequency_table *pxa255_freq_table; |
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const struct pxa_freqs *pxa255_freqs; |
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/* try to guess pxa27x cpu */ |
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if (cpu_is_pxa27x()) |
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pxa27x_guess_max_freq(); |
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pxa_cpufreq_init_voltages(); |
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/* set default policy and cpuinfo */ |
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policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */ |
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/* Generate pxa25x the run cpufreq_frequency_table struct */ |
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for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) { |
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pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz; |
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pxa255_run_freq_table[i].driver_data = i; |
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} |
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pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END; |
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/* Generate pxa25x the turbo cpufreq_frequency_table struct */ |
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for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) { |
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pxa255_turbo_freq_table[i].frequency = |
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pxa255_turbo_freqs[i].khz; |
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pxa255_turbo_freq_table[i].driver_data = i; |
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} |
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pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END; |
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pxa255_turbo_table = !!pxa255_turbo_table; |
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/* Generate the pxa27x cpufreq_frequency_table struct */ |
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for (i = 0; i < NUM_PXA27x_FREQS; i++) { |
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freq = pxa27x_freqs[i].khz; |
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if (freq > pxa27x_maxfreq) |
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break; |
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pxa27x_freq_table[i].frequency = freq; |
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pxa27x_freq_table[i].driver_data = i; |
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} |
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pxa27x_freq_table[i].driver_data = i; |
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pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END; |
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/* |
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* Set the policy's minimum and maximum frequencies from the tables |
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* just constructed. This sets cpuinfo.mxx_freq, min and max. |
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*/ |
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if (cpu_is_pxa25x()) { |
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find_freq_tables(&pxa255_freq_table, &pxa255_freqs); |
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pr_info("using %s frequency table\n", |
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pxa255_turbo_table ? "turbo" : "run"); |
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policy->freq_table = pxa255_freq_table; |
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} |
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else if (cpu_is_pxa27x()) { |
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policy->freq_table = pxa27x_freq_table; |
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} |
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pr_info("frequency change support initialized\n"); |
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return 0; |
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} |
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static struct cpufreq_driver pxa_cpufreq_driver = { |
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.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
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.verify = cpufreq_generic_frequency_table_verify, |
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.target_index = pxa_set_target, |
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.init = pxa_cpufreq_init, |
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.get = pxa_cpufreq_get, |
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.name = "PXA2xx", |
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.driver_data = &pxa_cpufreq_data, |
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}; |
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static int __init pxa_cpu_init(void) |
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{ |
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int ret = -ENODEV; |
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pxa_cpufreq_data.clk_core = clk_get_sys(NULL, "core"); |
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if (IS_ERR(pxa_cpufreq_data.clk_core)) |
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return PTR_ERR(pxa_cpufreq_data.clk_core); |
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if (cpu_is_pxa25x() || cpu_is_pxa27x()) |
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ret = cpufreq_register_driver(&pxa_cpufreq_driver); |
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return ret; |
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} |
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static void __exit pxa_cpu_exit(void) |
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{ |
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cpufreq_unregister_driver(&pxa_cpufreq_driver); |
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} |
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MODULE_AUTHOR("Intrinsyc Software Inc."); |
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MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture"); |
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MODULE_LICENSE("GPL"); |
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module_init(pxa_cpu_init); |
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module_exit(pxa_cpu_exit);
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