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632 lines
16 KiB
632 lines
16 KiB
/* |
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* pcc-cpufreq.c - Processor Clocking Control firmware cpufreq interface |
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* |
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* Copyright (C) 2009 Red Hat, Matthew Garrett <[email protected]> |
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* Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
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* Nagananda Chumbalkar <[email protected]> |
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* |
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; version 2 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or NON |
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* INFRINGEMENT. See the GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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*/ |
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|
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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/smp.h> |
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#include <linux/sched.h> |
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#include <linux/cpufreq.h> |
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#include <linux/compiler.h> |
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#include <linux/slab.h> |
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#include <linux/acpi.h> |
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#include <linux/io.h> |
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#include <linux/spinlock.h> |
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#include <linux/uaccess.h> |
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#include <acpi/processor.h> |
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#define PCC_VERSION "1.10.00" |
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#define POLL_LOOPS 300 |
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#define CMD_COMPLETE 0x1 |
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#define CMD_GET_FREQ 0x0 |
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#define CMD_SET_FREQ 0x1 |
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|
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#define BUF_SZ 4 |
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struct pcc_register_resource { |
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u8 descriptor; |
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u16 length; |
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u8 space_id; |
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u8 bit_width; |
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u8 bit_offset; |
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u8 access_size; |
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u64 address; |
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} __attribute__ ((packed)); |
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struct pcc_memory_resource { |
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u8 descriptor; |
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u16 length; |
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u8 space_id; |
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u8 resource_usage; |
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u8 type_specific; |
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u64 granularity; |
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u64 minimum; |
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u64 maximum; |
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u64 translation_offset; |
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u64 address_length; |
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} __attribute__ ((packed)); |
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|
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static struct cpufreq_driver pcc_cpufreq_driver; |
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struct pcc_header { |
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u32 signature; |
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u16 length; |
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u8 major; |
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u8 minor; |
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u32 features; |
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u16 command; |
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u16 status; |
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u32 latency; |
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u32 minimum_time; |
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u32 maximum_time; |
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u32 nominal; |
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u32 throttled_frequency; |
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u32 minimum_frequency; |
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}; |
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static void __iomem *pcch_virt_addr; |
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static struct pcc_header __iomem *pcch_hdr; |
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static DEFINE_SPINLOCK(pcc_lock); |
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static struct acpi_generic_address doorbell; |
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static u64 doorbell_preserve; |
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static u64 doorbell_write; |
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static u8 OSC_UUID[16] = {0x9F, 0x2C, 0x9B, 0x63, 0x91, 0x70, 0x1f, 0x49, |
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0xBB, 0x4F, 0xA5, 0x98, 0x2F, 0xA1, 0xB5, 0x46}; |
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struct pcc_cpu { |
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u32 input_offset; |
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u32 output_offset; |
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}; |
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static struct pcc_cpu __percpu *pcc_cpu_info; |
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static int pcc_cpufreq_verify(struct cpufreq_policy_data *policy) |
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{ |
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cpufreq_verify_within_cpu_limits(policy); |
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return 0; |
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} |
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static inline void pcc_cmd(void) |
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{ |
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u64 doorbell_value; |
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int i; |
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acpi_read(&doorbell_value, &doorbell); |
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acpi_write((doorbell_value & doorbell_preserve) | doorbell_write, |
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&doorbell); |
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for (i = 0; i < POLL_LOOPS; i++) { |
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if (ioread16(&pcch_hdr->status) & CMD_COMPLETE) |
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break; |
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} |
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} |
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static inline void pcc_clear_mapping(void) |
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{ |
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if (pcch_virt_addr) |
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iounmap(pcch_virt_addr); |
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pcch_virt_addr = NULL; |
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} |
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static unsigned int pcc_get_freq(unsigned int cpu) |
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{ |
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struct pcc_cpu *pcc_cpu_data; |
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unsigned int curr_freq; |
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unsigned int freq_limit; |
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u16 status; |
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u32 input_buffer; |
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u32 output_buffer; |
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spin_lock(&pcc_lock); |
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pr_debug("get: get_freq for CPU %d\n", cpu); |
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pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); |
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input_buffer = 0x1; |
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iowrite32(input_buffer, |
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(pcch_virt_addr + pcc_cpu_data->input_offset)); |
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iowrite16(CMD_GET_FREQ, &pcch_hdr->command); |
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pcc_cmd(); |
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output_buffer = |
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ioread32(pcch_virt_addr + pcc_cpu_data->output_offset); |
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/* Clear the input buffer - we are done with the current command */ |
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memset_io((pcch_virt_addr + pcc_cpu_data->input_offset), 0, BUF_SZ); |
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status = ioread16(&pcch_hdr->status); |
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if (status != CMD_COMPLETE) { |
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pr_debug("get: FAILED: for CPU %d, status is %d\n", |
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cpu, status); |
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goto cmd_incomplete; |
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} |
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iowrite16(0, &pcch_hdr->status); |
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curr_freq = (((ioread32(&pcch_hdr->nominal) * (output_buffer & 0xff)) |
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/ 100) * 1000); |
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pr_debug("get: SUCCESS: (virtual) output_offset for cpu %d is " |
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"0x%p, contains a value of: 0x%x. Speed is: %d MHz\n", |
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cpu, (pcch_virt_addr + pcc_cpu_data->output_offset), |
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output_buffer, curr_freq); |
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freq_limit = (output_buffer >> 8) & 0xff; |
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if (freq_limit != 0xff) { |
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pr_debug("get: frequency for cpu %d is being temporarily" |
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" capped at %d\n", cpu, curr_freq); |
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} |
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spin_unlock(&pcc_lock); |
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return curr_freq; |
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cmd_incomplete: |
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iowrite16(0, &pcch_hdr->status); |
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spin_unlock(&pcc_lock); |
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return 0; |
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} |
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static int pcc_cpufreq_target(struct cpufreq_policy *policy, |
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unsigned int target_freq, |
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unsigned int relation) |
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{ |
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struct pcc_cpu *pcc_cpu_data; |
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struct cpufreq_freqs freqs; |
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u16 status; |
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u32 input_buffer; |
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int cpu; |
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cpu = policy->cpu; |
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pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); |
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pr_debug("target: CPU %d should go to target freq: %d " |
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"(virtual) input_offset is 0x%p\n", |
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cpu, target_freq, |
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(pcch_virt_addr + pcc_cpu_data->input_offset)); |
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freqs.old = policy->cur; |
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freqs.new = target_freq; |
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cpufreq_freq_transition_begin(policy, &freqs); |
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spin_lock(&pcc_lock); |
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input_buffer = 0x1 | (((target_freq * 100) |
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/ (ioread32(&pcch_hdr->nominal) * 1000)) << 8); |
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iowrite32(input_buffer, |
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(pcch_virt_addr + pcc_cpu_data->input_offset)); |
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iowrite16(CMD_SET_FREQ, &pcch_hdr->command); |
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pcc_cmd(); |
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/* Clear the input buffer - we are done with the current command */ |
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memset_io((pcch_virt_addr + pcc_cpu_data->input_offset), 0, BUF_SZ); |
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status = ioread16(&pcch_hdr->status); |
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iowrite16(0, &pcch_hdr->status); |
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cpufreq_freq_transition_end(policy, &freqs, status != CMD_COMPLETE); |
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spin_unlock(&pcc_lock); |
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if (status != CMD_COMPLETE) { |
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pr_debug("target: FAILED for cpu %d, with status: 0x%x\n", |
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cpu, status); |
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return -EINVAL; |
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} |
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pr_debug("target: was SUCCESSFUL for cpu %d\n", cpu); |
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return 0; |
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} |
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static int pcc_get_offset(int cpu) |
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{ |
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acpi_status status; |
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
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union acpi_object *pccp, *offset; |
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struct pcc_cpu *pcc_cpu_data; |
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struct acpi_processor *pr; |
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int ret = 0; |
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pr = per_cpu(processors, cpu); |
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pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); |
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if (!pr) |
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return -ENODEV; |
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status = acpi_evaluate_object(pr->handle, "PCCP", NULL, &buffer); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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pccp = buffer.pointer; |
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if (!pccp || pccp->type != ACPI_TYPE_PACKAGE) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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offset = &(pccp->package.elements[0]); |
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if (!offset || offset->type != ACPI_TYPE_INTEGER) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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pcc_cpu_data->input_offset = offset->integer.value; |
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offset = &(pccp->package.elements[1]); |
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if (!offset || offset->type != ACPI_TYPE_INTEGER) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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pcc_cpu_data->output_offset = offset->integer.value; |
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memset_io((pcch_virt_addr + pcc_cpu_data->input_offset), 0, BUF_SZ); |
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memset_io((pcch_virt_addr + pcc_cpu_data->output_offset), 0, BUF_SZ); |
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pr_debug("pcc_get_offset: for CPU %d: pcc_cpu_data " |
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"input_offset: 0x%x, pcc_cpu_data output_offset: 0x%x\n", |
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cpu, pcc_cpu_data->input_offset, pcc_cpu_data->output_offset); |
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out_free: |
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kfree(buffer.pointer); |
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return ret; |
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} |
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static int __init pcc_cpufreq_do_osc(acpi_handle *handle) |
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{ |
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acpi_status status; |
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struct acpi_object_list input; |
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struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
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union acpi_object in_params[4]; |
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union acpi_object *out_obj; |
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u32 capabilities[2]; |
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u32 errors; |
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u32 supported; |
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int ret = 0; |
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input.count = 4; |
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input.pointer = in_params; |
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in_params[0].type = ACPI_TYPE_BUFFER; |
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in_params[0].buffer.length = 16; |
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in_params[0].buffer.pointer = OSC_UUID; |
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in_params[1].type = ACPI_TYPE_INTEGER; |
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in_params[1].integer.value = 1; |
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in_params[2].type = ACPI_TYPE_INTEGER; |
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in_params[2].integer.value = 2; |
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in_params[3].type = ACPI_TYPE_BUFFER; |
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in_params[3].buffer.length = 8; |
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in_params[3].buffer.pointer = (u8 *)&capabilities; |
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capabilities[0] = OSC_QUERY_ENABLE; |
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capabilities[1] = 0x1; |
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status = acpi_evaluate_object(*handle, "_OSC", &input, &output); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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if (!output.length) |
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return -ENODEV; |
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out_obj = output.pointer; |
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if (out_obj->type != ACPI_TYPE_BUFFER) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); |
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if (errors) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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supported = *((u32 *)(out_obj->buffer.pointer + 4)); |
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if (!(supported & 0x1)) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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kfree(output.pointer); |
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capabilities[0] = 0x0; |
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capabilities[1] = 0x1; |
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status = acpi_evaluate_object(*handle, "_OSC", &input, &output); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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|
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if (!output.length) |
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return -ENODEV; |
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out_obj = output.pointer; |
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if (out_obj->type != ACPI_TYPE_BUFFER) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); |
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if (errors) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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supported = *((u32 *)(out_obj->buffer.pointer + 4)); |
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if (!(supported & 0x1)) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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out_free: |
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kfree(output.pointer); |
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return ret; |
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} |
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static int __init pcc_cpufreq_probe(void) |
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{ |
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acpi_status status; |
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struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
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struct pcc_memory_resource *mem_resource; |
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struct pcc_register_resource *reg_resource; |
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union acpi_object *out_obj, *member; |
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acpi_handle handle, osc_handle; |
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int ret = 0; |
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status = acpi_get_handle(NULL, "\\_SB", &handle); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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|
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if (!acpi_has_method(handle, "PCCH")) |
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return -ENODEV; |
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status = acpi_get_handle(handle, "_OSC", &osc_handle); |
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if (ACPI_SUCCESS(status)) { |
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ret = pcc_cpufreq_do_osc(&osc_handle); |
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if (ret) |
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pr_debug("probe: _OSC evaluation did not succeed\n"); |
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/* Firmware's use of _OSC is optional */ |
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ret = 0; |
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} |
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status = acpi_evaluate_object(handle, "PCCH", NULL, &output); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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out_obj = output.pointer; |
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if (out_obj->type != ACPI_TYPE_PACKAGE) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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member = &out_obj->package.elements[0]; |
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if (member->type != ACPI_TYPE_BUFFER) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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mem_resource = (struct pcc_memory_resource *)member->buffer.pointer; |
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pr_debug("probe: mem_resource descriptor: 0x%x," |
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" length: %d, space_id: %d, resource_usage: %d," |
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" type_specific: %d, granularity: 0x%llx," |
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" minimum: 0x%llx, maximum: 0x%llx," |
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" translation_offset: 0x%llx, address_length: 0x%llx\n", |
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mem_resource->descriptor, mem_resource->length, |
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mem_resource->space_id, mem_resource->resource_usage, |
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mem_resource->type_specific, mem_resource->granularity, |
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mem_resource->minimum, mem_resource->maximum, |
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mem_resource->translation_offset, |
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mem_resource->address_length); |
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if (mem_resource->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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|
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pcch_virt_addr = ioremap(mem_resource->minimum, |
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mem_resource->address_length); |
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if (pcch_virt_addr == NULL) { |
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pr_debug("probe: could not map shared mem region\n"); |
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ret = -ENOMEM; |
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goto out_free; |
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} |
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pcch_hdr = pcch_virt_addr; |
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|
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pr_debug("probe: PCCH header (virtual) addr: 0x%p\n", pcch_hdr); |
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pr_debug("probe: PCCH header is at physical address: 0x%llx," |
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" signature: 0x%x, length: %d bytes, major: %d, minor: %d," |
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" supported features: 0x%x, command field: 0x%x," |
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" status field: 0x%x, nominal latency: %d us\n", |
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mem_resource->minimum, ioread32(&pcch_hdr->signature), |
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ioread16(&pcch_hdr->length), ioread8(&pcch_hdr->major), |
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ioread8(&pcch_hdr->minor), ioread32(&pcch_hdr->features), |
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ioread16(&pcch_hdr->command), ioread16(&pcch_hdr->status), |
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ioread32(&pcch_hdr->latency)); |
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|
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pr_debug("probe: min time between commands: %d us," |
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" max time between commands: %d us," |
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" nominal CPU frequency: %d MHz," |
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" minimum CPU frequency: %d MHz," |
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" minimum CPU frequency without throttling: %d MHz\n", |
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ioread32(&pcch_hdr->minimum_time), |
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ioread32(&pcch_hdr->maximum_time), |
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ioread32(&pcch_hdr->nominal), |
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ioread32(&pcch_hdr->throttled_frequency), |
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ioread32(&pcch_hdr->minimum_frequency)); |
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|
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member = &out_obj->package.elements[1]; |
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if (member->type != ACPI_TYPE_BUFFER) { |
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ret = -ENODEV; |
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goto pcch_free; |
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} |
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|
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reg_resource = (struct pcc_register_resource *)member->buffer.pointer; |
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|
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doorbell.space_id = reg_resource->space_id; |
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doorbell.bit_width = reg_resource->bit_width; |
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doorbell.bit_offset = reg_resource->bit_offset; |
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doorbell.access_width = 4; |
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doorbell.address = reg_resource->address; |
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|
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pr_debug("probe: doorbell: space_id is %d, bit_width is %d, " |
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"bit_offset is %d, access_width is %d, address is 0x%llx\n", |
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doorbell.space_id, doorbell.bit_width, doorbell.bit_offset, |
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doorbell.access_width, reg_resource->address); |
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|
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member = &out_obj->package.elements[2]; |
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if (member->type != ACPI_TYPE_INTEGER) { |
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ret = -ENODEV; |
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goto pcch_free; |
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} |
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|
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doorbell_preserve = member->integer.value; |
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|
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member = &out_obj->package.elements[3]; |
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if (member->type != ACPI_TYPE_INTEGER) { |
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ret = -ENODEV; |
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goto pcch_free; |
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} |
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|
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doorbell_write = member->integer.value; |
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|
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pr_debug("probe: doorbell_preserve: 0x%llx," |
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" doorbell_write: 0x%llx\n", |
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doorbell_preserve, doorbell_write); |
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|
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pcc_cpu_info = alloc_percpu(struct pcc_cpu); |
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if (!pcc_cpu_info) { |
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ret = -ENOMEM; |
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goto pcch_free; |
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} |
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|
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printk(KERN_DEBUG "pcc-cpufreq: (v%s) driver loaded with frequency" |
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" limits: %d MHz, %d MHz\n", PCC_VERSION, |
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ioread32(&pcch_hdr->minimum_frequency), |
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ioread32(&pcch_hdr->nominal)); |
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kfree(output.pointer); |
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return ret; |
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pcch_free: |
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pcc_clear_mapping(); |
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out_free: |
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kfree(output.pointer); |
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return ret; |
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} |
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|
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static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy) |
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{ |
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unsigned int cpu = policy->cpu; |
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unsigned int result = 0; |
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|
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if (!pcch_virt_addr) { |
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result = -1; |
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goto out; |
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} |
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|
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result = pcc_get_offset(cpu); |
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if (result) { |
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pr_debug("init: PCCP evaluation failed\n"); |
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goto out; |
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} |
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|
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policy->max = policy->cpuinfo.max_freq = |
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ioread32(&pcch_hdr->nominal) * 1000; |
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policy->min = policy->cpuinfo.min_freq = |
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ioread32(&pcch_hdr->minimum_frequency) * 1000; |
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|
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pr_debug("init: policy->max is %d, policy->min is %d\n", |
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policy->max, policy->min); |
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out: |
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return result; |
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} |
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|
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static int pcc_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
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{ |
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return 0; |
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} |
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|
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static struct cpufreq_driver pcc_cpufreq_driver = { |
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.flags = CPUFREQ_CONST_LOOPS, |
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.get = pcc_get_freq, |
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.verify = pcc_cpufreq_verify, |
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.target = pcc_cpufreq_target, |
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.init = pcc_cpufreq_cpu_init, |
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.exit = pcc_cpufreq_cpu_exit, |
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.name = "pcc-cpufreq", |
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}; |
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|
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static int __init pcc_cpufreq_init(void) |
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{ |
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int ret; |
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|
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/* Skip initialization if another cpufreq driver is there. */ |
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if (cpufreq_get_current_driver()) |
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return -EEXIST; |
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|
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if (acpi_disabled) |
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return -ENODEV; |
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|
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ret = pcc_cpufreq_probe(); |
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if (ret) { |
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pr_debug("pcc_cpufreq_init: PCCH evaluation failed\n"); |
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return ret; |
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} |
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|
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if (num_present_cpus() > 4) { |
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pcc_cpufreq_driver.flags |= CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING; |
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pr_err("%s: Too many CPUs, dynamic performance scaling disabled\n", |
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__func__); |
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pr_err("%s: Try to enable another scaling driver through BIOS settings\n", |
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__func__); |
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pr_err("%s: and complain to the system vendor\n", __func__); |
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} |
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|
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ret = cpufreq_register_driver(&pcc_cpufreq_driver); |
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|
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return ret; |
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} |
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|
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static void __exit pcc_cpufreq_exit(void) |
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{ |
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cpufreq_unregister_driver(&pcc_cpufreq_driver); |
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|
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pcc_clear_mapping(); |
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|
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free_percpu(pcc_cpu_info); |
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} |
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|
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static const struct acpi_device_id __maybe_unused processor_device_ids[] = { |
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{ACPI_PROCESSOR_OBJECT_HID, }, |
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{ACPI_PROCESSOR_DEVICE_HID, }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, processor_device_ids); |
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|
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MODULE_AUTHOR("Matthew Garrett, Naga Chumbalkar"); |
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MODULE_VERSION(PCC_VERSION); |
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MODULE_DESCRIPTION("Processor Clocking Control interface driver"); |
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MODULE_LICENSE("GPL"); |
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|
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late_initcall(pcc_cpufreq_init); |
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module_exit(pcc_cpufreq_exit);
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