Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 1 | /* |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 2 | * Copyright (C) STMicroelectronics 2009 |
Lee Jones | 0baf066 | 2012-11-28 11:27:44 +0100 | [diff] [blame] | 3 | * Copyright (C) ST-Ericsson SA 2010-2012 |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 4 | * |
| 5 | * License Terms: GNU General Public License v2 |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 6 | * Author: Sundar Iyer <sundar.iyer@stericsson.com> |
| 7 | * Author: Martin Persson <martin.persson@stericsson.com> |
| 8 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 9 | */ |
Lee Jones | 0baf066 | 2012-11-28 11:27:44 +0100 | [diff] [blame] | 10 | |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 11 | #include <linux/module.h> |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/cpufreq.h> |
| 14 | #include <linux/delay.h> |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 15 | #include <linux/slab.h> |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 16 | #include <linux/platform_device.h> |
Ulf Hansson | 78e30d1 | 2012-10-10 13:42:29 +0200 | [diff] [blame] | 17 | #include <linux/clk.h> |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 18 | |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 19 | static struct cpufreq_frequency_table *freq_table; |
Ulf Hansson | 78e30d1 | 2012-10-10 13:42:29 +0200 | [diff] [blame] | 20 | static struct clk *armss_clk; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 21 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 22 | static struct freq_attr *dbx500_cpufreq_attr[] = { |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 23 | &cpufreq_freq_attr_scaling_available_freqs, |
| 24 | NULL, |
| 25 | }; |
| 26 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 27 | static int dbx500_cpufreq_verify_speed(struct cpufreq_policy *policy) |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 28 | { |
| 29 | return cpufreq_frequency_table_verify(policy, freq_table); |
| 30 | } |
| 31 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 32 | static int dbx500_cpufreq_target(struct cpufreq_policy *policy, |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 33 | unsigned int target_freq, |
| 34 | unsigned int relation) |
| 35 | { |
| 36 | struct cpufreq_freqs freqs; |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 37 | unsigned int idx; |
Jonas Aaberg | 9291cf9 | 2012-11-28 11:27:43 +0100 | [diff] [blame] | 38 | int ret; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 39 | |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 40 | /* Lookup the next frequency */ |
Jonas Aaberg | 9291cf9 | 2012-11-28 11:27:43 +0100 | [diff] [blame] | 41 | if (cpufreq_frequency_table_target(policy, freq_table, target_freq, |
| 42 | relation, &idx)) |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 43 | return -EINVAL; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 44 | |
| 45 | freqs.old = policy->cur; |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 46 | freqs.new = freq_table[idx].frequency; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 47 | |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 48 | if (freqs.old == freqs.new) |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 49 | return 0; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 50 | |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 51 | /* pre-change notification */ |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 52 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 53 | |
Ulf Hansson | 78e30d1 | 2012-10-10 13:42:29 +0200 | [diff] [blame] | 54 | /* update armss clk frequency */ |
Jonas Aaberg | 9291cf9 | 2012-11-28 11:27:43 +0100 | [diff] [blame] | 55 | ret = clk_set_rate(armss_clk, freqs.new * 1000); |
| 56 | |
| 57 | if (ret) { |
| 58 | pr_err("dbx500-cpufreq: Failed to set armss_clk to %d Hz: error %d\n", |
| 59 | freqs.new * 1000, ret); |
| 60 | return ret; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 61 | } |
| 62 | |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 63 | /* post change notification */ |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 64 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 65 | |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 66 | return 0; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 67 | } |
| 68 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 69 | static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu) |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 70 | { |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 71 | int i = 0; |
Ulf Hansson | 78e30d1 | 2012-10-10 13:42:29 +0200 | [diff] [blame] | 72 | unsigned long freq = clk_get_rate(armss_clk) / 1000; |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 73 | |
Mats Fagerstrom | c778966 | 2013-04-11 23:23:57 +0200 | [diff] [blame^] | 74 | /* The value is rounded to closest frequency in the defined table. */ |
| 75 | while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) { |
| 76 | if (freq < freq_table[i].frequency + |
| 77 | (freq_table[i + 1].frequency - freq_table[i].frequency) / 2) |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 78 | return freq_table[i].frequency; |
| 79 | i++; |
| 80 | } |
| 81 | |
Mats Fagerstrom | c778966 | 2013-04-11 23:23:57 +0200 | [diff] [blame^] | 82 | return freq_table[i].frequency; |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 83 | } |
| 84 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 85 | static int __cpuinit dbx500_cpufreq_init(struct cpufreq_policy *policy) |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 86 | { |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 87 | int res; |
Daniel Willerud | c72fe85 | 2012-01-13 16:20:03 +0100 | [diff] [blame] | 88 | |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 89 | /* get policy fields based on the table */ |
| 90 | res = cpufreq_frequency_table_cpuinfo(policy, freq_table); |
| 91 | if (!res) |
| 92 | cpufreq_frequency_table_get_attr(freq_table, policy->cpu); |
| 93 | else { |
Jonas Aaberg | 9291cf9 | 2012-11-28 11:27:43 +0100 | [diff] [blame] | 94 | pr_err("dbx500-cpufreq: Failed to read policy table\n"); |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 95 | return res; |
| 96 | } |
| 97 | |
| 98 | policy->min = policy->cpuinfo.min_freq; |
| 99 | policy->max = policy->cpuinfo.max_freq; |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 100 | policy->cur = dbx500_cpufreq_getspeed(policy->cpu); |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 101 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; |
| 102 | |
| 103 | /* |
| 104 | * FIXME : Need to take time measurement across the target() |
| 105 | * function with no/some/all drivers in the notification |
| 106 | * list. |
| 107 | */ |
Linus Walleij | 72b2fd5 | 2011-05-15 19:19:51 +0200 | [diff] [blame] | 108 | policy->cpuinfo.transition_latency = 20 * 1000; /* in ns */ |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 109 | |
| 110 | /* policy sharing between dual CPUs */ |
Viresh Kumar | 4c738d0 | 2013-02-01 06:40:01 +0000 | [diff] [blame] | 111 | cpumask_setall(policy->cpus); |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 112 | |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 113 | return 0; |
| 114 | } |
| 115 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 116 | static struct cpufreq_driver dbx500_cpufreq_driver = { |
Fabio Baltieri | ec66912 | 2012-12-04 11:10:45 +0100 | [diff] [blame] | 117 | .flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS, |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 118 | .verify = dbx500_cpufreq_verify_speed, |
| 119 | .target = dbx500_cpufreq_target, |
| 120 | .get = dbx500_cpufreq_getspeed, |
| 121 | .init = dbx500_cpufreq_init, |
| 122 | .name = "DBX500", |
| 123 | .attr = dbx500_cpufreq_attr, |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 124 | }; |
| 125 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 126 | static int dbx500_cpufreq_probe(struct platform_device *pdev) |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 127 | { |
Ulf Hansson | 3e27996 | 2012-12-10 16:25:40 +0100 | [diff] [blame] | 128 | int i = 0; |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 129 | |
Ulf Hansson | 3e27996 | 2012-12-10 16:25:40 +0100 | [diff] [blame] | 130 | freq_table = dev_get_platdata(&pdev->dev); |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 131 | if (!freq_table) { |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 132 | pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n"); |
Ulf Hansson | fdb4446 | 2012-10-10 13:42:25 +0200 | [diff] [blame] | 133 | return -ENODEV; |
| 134 | } |
| 135 | |
Ulf Hansson | 3e27996 | 2012-12-10 16:25:40 +0100 | [diff] [blame] | 136 | armss_clk = clk_get(&pdev->dev, "armss"); |
| 137 | if (IS_ERR(armss_clk)) { |
Jonas Aaberg | 9291cf9 | 2012-11-28 11:27:43 +0100 | [diff] [blame] | 138 | pr_err("dbx500-cpufreq: Failed to get armss clk\n"); |
Ulf Hansson | 3e27996 | 2012-12-10 16:25:40 +0100 | [diff] [blame] | 139 | return PTR_ERR(armss_clk); |
| 140 | } |
| 141 | |
Jonas Aaberg | 9291cf9 | 2012-11-28 11:27:43 +0100 | [diff] [blame] | 142 | pr_info("dbx500-cpufreq: Available frequencies:\n"); |
Ulf Hansson | 3e27996 | 2012-12-10 16:25:40 +0100 | [diff] [blame] | 143 | while (freq_table[i].frequency != CPUFREQ_TABLE_END) { |
| 144 | pr_info(" %d Mhz\n", freq_table[i].frequency/1000); |
| 145 | i++; |
| 146 | } |
| 147 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 148 | return cpufreq_register_driver(&dbx500_cpufreq_driver); |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 149 | } |
| 150 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 151 | static struct platform_driver dbx500_cpufreq_plat_driver = { |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 152 | .driver = { |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 153 | .name = "cpufreq-ux500", |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 154 | .owner = THIS_MODULE, |
| 155 | }, |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 156 | .probe = dbx500_cpufreq_probe, |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 157 | }; |
| 158 | |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 159 | static int __init dbx500_cpufreq_register(void) |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 160 | { |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 161 | return platform_driver_register(&dbx500_cpufreq_plat_driver); |
Martin Persson | 7c1a70e | 2010-12-08 15:13:42 +0100 | [diff] [blame] | 162 | } |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 163 | device_initcall(dbx500_cpufreq_register); |
Ulf Hansson | b468944 | 2012-10-10 13:42:24 +0200 | [diff] [blame] | 164 | |
| 165 | MODULE_LICENSE("GPL v2"); |
Lee Jones | edb10c1 | 2012-12-10 16:25:38 +0100 | [diff] [blame] | 166 | MODULE_DESCRIPTION("cpufreq driver for DBX500"); |