1 #define pr_fmt(fmt) "ddrfreq: " fmt
4 #include <linux/cpufreq.h>
5 #include <linux/delay.h>
6 #include <linux/earlysuspend.h>
7 #include <linux/freezer.h>
9 #include <linux/kthread.h>
10 #include <linux/miscdevice.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/uaccess.h>
15 #include <mach/board.h>
16 #include <mach/clock.h>
18 #include <mach/dvfs.h>
22 DEBUG_VIDEO_STATE = 1U << 1,
23 DEBUG_SUSPEND = 1U << 2,
24 DEBUG_VERBOSE = 1U << 3,
26 static int debug_mask = DEBUG_DDR;
27 module_param(debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
28 #define dprintk(mask, fmt, ...) do { if (mask & debug_mask) pr_info(fmt, ##__VA_ARGS__); } while (0)
30 #define MHZ (1000*1000)
34 SYS_STATUS_SUSPEND = 0, // 0x01
35 SYS_STATUS_VIDEO, // 0x02
36 SYS_STATUS_GPU, // 0x04
37 SYS_STATUS_RGA, // 0x08
38 SYS_STATUS_CIF0, // 0x10
39 SYS_STATUS_CIF1, // 0x20
43 #ifdef CONFIG_HAS_EARLYSUSPEND
44 struct early_suspend early_suspend;
48 unsigned long normal_rate;
49 unsigned long video_rate;
50 unsigned long idle_rate;
51 unsigned long suspend_rate;
53 bool auto_self_refresh;
55 unsigned long sys_status;
56 struct task_struct *task;
57 wait_queue_head_t wait;
59 static struct ddr ddr;
61 module_param_named(sys_status, ddr.sys_status, ulong, S_IRUGO);
62 module_param_named(video_state, ddr.video_state, byte, S_IRUGO);
63 module_param_named(auto_self_refresh, ddr.auto_self_refresh, bool, S_IRUGO);
64 module_param_named(mode, ddr.mode, charp, S_IRUGO);
66 static noinline void ddrfreq_set_sys_status(enum SYS_STATUS status)
68 set_bit(status, &ddr.sys_status);
72 static noinline void ddrfreq_clear_sys_status(enum SYS_STATUS status)
74 clear_bit(status, &ddr.sys_status);
78 static void ddrfreq_mode(bool auto_self_refresh, unsigned long *target_rate, char *name)
81 if (auto_self_refresh != ddr.auto_self_refresh) {
82 ddr_set_auto_self_refresh(auto_self_refresh);
83 ddr.auto_self_refresh = auto_self_refresh;
84 dprintk(DEBUG_DDR, "change auto self refresh to %d when %s\n", auto_self_refresh, name);
86 if (*target_rate != clk_get_rate(ddr.clk)) {
87 if (clk_set_rate(ddr.clk, *target_rate) == 0) {
88 *target_rate = clk_get_rate(ddr.clk);
89 dprintk(DEBUG_DDR, "change freq to %lu MHz when %s\n", *target_rate / MHZ, name);
94 static noinline void ddrfreq_work(unsigned long sys_status)
96 static struct clk *cpu = NULL;
97 static struct clk *gpu = NULL;
98 unsigned long s = sys_status;
101 cpu = clk_get(NULL, "cpu");
103 gpu = clk_get(NULL, "gpu");
104 dprintk(DEBUG_VERBOSE, "sys_status %02lx\n", sys_status);
105 if (ddr.suspend_rate && (s & (1 << SYS_STATUS_SUSPEND))) {
106 ddrfreq_mode(true, &ddr.suspend_rate, "suspend");
107 } else if (ddr.video_rate && (s & (1 << SYS_STATUS_VIDEO))) {
108 ddrfreq_mode(false, &ddr.video_rate, "video");
109 } else if (ddr.idle_rate
110 && !(s & (1 << SYS_STATUS_GPU))
111 && !(s & (1 << SYS_STATUS_RGA))
112 && !(s & (1 << SYS_STATUS_CIF0))
113 && !(s & (1 << SYS_STATUS_CIF1))
114 && (clk_get_rate(cpu) < 816 * MHZ)
115 && (clk_get_rate(gpu) <= 200 * MHZ)
117 ddrfreq_mode(false, &ddr.idle_rate, "idle");
119 ddrfreq_mode(false, &ddr.normal_rate, "normal");
123 static int ddrfreq_task(void *data)
128 unsigned long status = ddr.sys_status;
129 ddrfreq_work(status);
130 wait_event_freezable(ddr.wait, (status != ddr.sys_status) || kthread_should_stop());
131 } while (!kthread_should_stop());
137 static volatile bool __sramdata cpu1_pause;
138 static inline bool is_cpu1_paused(void) { smp_rmb(); return cpu1_pause; }
139 static inline void set_cpu1_pause(bool pause) { cpu1_pause = pause; smp_wmb(); }
140 #define MAX_TIMEOUT (16000000UL << 6) //>0.64s
142 static void __ddr_change_freq(void *info)
144 uint32_t *value = info;
145 u32 timeout = MAX_TIMEOUT;
147 while (!is_cpu1_paused() && --timeout);
151 *value = ddr_change_freq(*value);
153 set_cpu1_pause(false);
156 /* Do not use stack, safe on SMP */
157 static void __sramfunc pause_cpu1(void *info)
159 u32 timeout = MAX_TIMEOUT;
161 local_irq_save(flags);
163 set_cpu1_pause(true);
164 while (is_cpu1_paused() && --timeout);
166 local_irq_restore(flags);
169 static uint32_t _ddr_change_freq(uint32_t nMHz)
171 int this_cpu = get_cpu();
173 set_cpu1_pause(false);
175 if (smp_call_function_single(1, (smp_call_func_t)pause_cpu1, NULL, 0) == 0) {
176 u32 timeout = MAX_TIMEOUT;
177 while (!is_cpu1_paused() && --timeout);
182 nMHz = ddr_change_freq(nMHz);
184 set_cpu1_pause(false);
186 smp_call_function_single(0, __ddr_change_freq, &nMHz, 0);
197 static uint32_t _ddr_change_freq(uint32_t nMHz)
199 return ddr_change_freq(nMHz);
203 uint32_t ddr_set_rate(uint32_t nMHz)
205 nMHz = _ddr_change_freq(nMHz);
206 clk_set_rate(ddr.pll, 0);
210 #ifdef CONFIG_HAS_EARLYSUSPEND
211 static void ddrfreq_early_suspend(struct early_suspend *h)
213 dprintk(DEBUG_SUSPEND, "early suspend\n");
214 ddrfreq_set_sys_status(SYS_STATUS_SUSPEND);
217 static void ddrfreq_late_resume(struct early_suspend *h)
219 dprintk(DEBUG_SUSPEND, "late resume\n");
220 ddrfreq_clear_sys_status(SYS_STATUS_SUSPEND);
224 static int video_state_release(struct inode *inode, struct file *file)
226 dprintk(DEBUG_VIDEO_STATE, "video_state release\n");
227 ddr.video_state = '0';
228 ddrfreq_clear_sys_status(SYS_STATUS_VIDEO);
232 static ssize_t video_state_write(struct file *file, const char __user *buffer,
233 size_t count, loff_t *ppos)
239 if (copy_from_user(&state, buffer, 1)) {
243 dprintk(DEBUG_VIDEO_STATE, "video_state write %c\n", state);
246 ddrfreq_clear_sys_status(SYS_STATUS_VIDEO);
249 ddrfreq_set_sys_status(SYS_STATUS_VIDEO);
254 ddr.video_state = state;
258 static const struct file_operations video_state_fops = {
259 .owner = THIS_MODULE,
260 .release= video_state_release,
261 .write = video_state_write,
264 static struct miscdevice video_state_dev = {
265 .fops = &video_state_fops,
266 .name = "video_state",
267 .minor = MISC_DYNAMIC_MINOR,
270 static int ddrfreq_clk_event(enum SYS_STATUS status, unsigned long event)
274 ddrfreq_set_sys_status(status);
276 case CLK_ABORT_ENABLE:
277 case CLK_POST_DISABLE:
278 ddrfreq_clear_sys_status(status);
285 #define CLK_NOTIFIER(name, status) \
286 static int ddrfreq_clk_##name##_event(struct notifier_block *this, unsigned long event, void *ptr) \
288 return ddrfreq_clk_event(SYS_STATUS_##status, event); \
290 static struct notifier_block ddrfreq_clk_##name##_notifier = { .notifier_call = ddrfreq_clk_##name##_event };
292 #define REGISTER_CLK_NOTIFIER(name) \
294 struct clk *clk = clk_get(NULL, #name); \
295 clk_notifier_register(clk, &ddrfreq_clk_##name##_notifier); \
299 #define UNREGISTER_CLK_NOTIFIER(name) \
301 struct clk *clk = clk_get(NULL, #name); \
302 clk_notifier_unregister(clk, &ddrfreq_clk_##name##_notifier); \
306 CLK_NOTIFIER(pd_gpu, GPU);
307 CLK_NOTIFIER(pd_rga, RGA);
308 CLK_NOTIFIER(pd_cif0, CIF0);
309 CLK_NOTIFIER(pd_cif1, CIF1);
311 static int ddr_scale_rate_for_dvfs(struct clk *clk, unsigned long rate, dvfs_set_rate_callback set_rate)
313 ddr_set_rate(rate/(1000*1000));
317 static int ddrfreq_init(void)
320 struct cpufreq_frequency_table *table;
321 bool new_version = false;
323 init_waitqueue_head(&ddr.wait);
324 ddr.video_state = '0';
327 ddr.pll = clk_get(NULL, "ddr_pll");
328 ddr.clk = clk_get(NULL, "ddr");
329 if (IS_ERR(ddr.clk)) {
330 ret = PTR_ERR(ddr.clk);
332 pr_err("failed to get ddr clk, error %d\n", ret);
335 dvfs_clk_register_set_rate_callback(ddr.clk, ddr_scale_rate_for_dvfs);
337 ddr.normal_rate = clk_get_rate(ddr.clk);
339 table = dvfs_get_freq_volt_table(ddr.clk);
341 pr_err("failed to get ddr freq volt table\n");
344 for (i = 0; table && table[i].frequency != CPUFREQ_TABLE_END; i++) {
345 if (table[i].frequency % 1000) {
351 ddr.video_rate = 300 * MHZ;
352 ddr.suspend_rate = 200 * MHZ;
354 for (i = 0; new_version && table && table[i].frequency != CPUFREQ_TABLE_END; i++) {
355 unsigned int mode = table[i].frequency % 1000;
358 table[i].frequency -= mode;
359 rate = table[i].frequency * 1000;
362 case DDR_FREQ_NORMAL:
363 ddr.normal_rate = rate;
366 ddr.video_rate = rate;
369 ddr.idle_rate = rate;
371 case DDR_FREQ_SUSPEND:
372 ddr.suspend_rate = rate;
378 REGISTER_CLK_NOTIFIER(pd_gpu);
379 REGISTER_CLK_NOTIFIER(pd_rga);
380 REGISTER_CLK_NOTIFIER(pd_cif0);
381 REGISTER_CLK_NOTIFIER(pd_cif1);
387 core_initcall(ddrfreq_init);
389 static int ddrfreq_late_init(void)
392 struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
398 ret = misc_register(&video_state_dev);
400 pr_err("failed to register video_state misc device! error %d\n", ret);
404 #ifdef CONFIG_HAS_EARLYSUSPEND
405 ddr.early_suspend.suspend = ddrfreq_early_suspend;
406 ddr.early_suspend.resume = ddrfreq_late_resume;
407 ddr.early_suspend.level = EARLY_SUSPEND_LEVEL_DISABLE_FB + 50;
408 register_early_suspend(&ddr.early_suspend);
411 ddr.task = kthread_create(ddrfreq_task, NULL, "ddrfreqd");
412 if (IS_ERR(ddr.task)) {
413 ret = PTR_ERR(ddr.task);
414 pr_err("failed to create kthread! error %d\n", ret);
418 sched_setscheduler_nocheck(ddr.task, SCHED_FIFO, ¶m);
419 get_task_struct(ddr.task);
420 kthread_bind(ddr.task, 0);
421 wake_up_process(ddr.task);
423 pr_info("verion 1.1\n");
424 dprintk(DEBUG_DDR, "normal %luMHz video %luMHz idle %luMHz suspend %luMHz\n",
425 ddr.normal_rate / MHZ, ddr.video_rate / MHZ, ddr.idle_rate / MHZ, ddr.suspend_rate / MHZ);
430 #ifdef CONFIG_HAS_EARLYSUSPEND
431 unregister_early_suspend(&ddr.early_suspend);
433 misc_deregister(&video_state_dev);
436 UNREGISTER_CLK_NOTIFIER(pd_gpu);
437 UNREGISTER_CLK_NOTIFIER(pd_rga);
438 UNREGISTER_CLK_NOTIFIER(pd_cif0);
439 UNREGISTER_CLK_NOTIFIER(pd_cif1);
444 late_initcall(ddrfreq_late_init);