2 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * CPU frequency scaling for S5PC110/S5PV210
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/clk.h>
18 #include <linux/cpufreq.h>
19 #include <linux/reboot.h>
20 #include <linux/regulator/consumer.h>
21 #include <linux/suspend.h>
24 #include <mach/regs-clock.h>
26 static struct clk
*cpu_clk
;
27 static struct clk
*dmc0_clk
;
28 static struct clk
*dmc1_clk
;
29 static struct cpufreq_freqs freqs
;
30 static DEFINE_MUTEX(set_freq_lock
);
32 /* APLL M,P,S values for 1G/800Mhz */
33 #define APLL_VAL_1000 ((1 << 31) | (125 << 16) | (3 << 8) | 1)
34 #define APLL_VAL_800 ((1 << 31) | (100 << 16) | (3 << 8) | 1)
36 /* Use 800MHz when entering sleep mode */
37 #define SLEEP_FREQ (800 * 1000)
40 * relation has an additional symantics other than the standard of cpufreq
41 * DISALBE_FURTHER_CPUFREQ: disable further access to target
42 * ENABLE_FURTUER_CPUFREQ: enable access to target
45 DISABLE_FURTHER_CPUFREQ
= 0x10,
46 ENABLE_FURTHER_CPUFREQ
= 0x20,
49 static bool no_cpufreq_access
;
52 * DRAM configurations to calculate refresh counter for changing
53 * frequency of memory.
56 unsigned long freq
; /* HZ */
57 unsigned long refresh
; /* DRAM refresh counter * 1000 */
60 /* DRAM configuration (DMC0 and DMC1) */
61 static struct dram_conf s5pv210_dram_conf
[2];
67 enum s5pv210_mem_type
{
73 enum s5pv210_dmc_port
{
78 static struct cpufreq_frequency_table s5pv210_freq_table
[] = {
84 {0, CPUFREQ_TABLE_END
},
87 static struct regulator
*arm_regulator
;
88 static struct regulator
*int_regulator
;
90 struct s5pv210_dvs_conf
{
91 int arm_volt
; /* uV */
92 int int_volt
; /* uV */
95 static const int arm_volt_max
= 1350000;
96 static const int int_volt_max
= 1250000;
98 static struct s5pv210_dvs_conf dvs_conf
[] = {
121 static u32 clkdiv_val
[5][11] = {
123 * Clock divider value for following
124 * { APLL, A2M, HCLK_MSYS, PCLK_MSYS,
125 * HCLK_DSYS, PCLK_DSYS, HCLK_PSYS, PCLK_PSYS,
126 * ONEDRAM, MFC, G3D }
129 /* L0 : [1000/200/100][166/83][133/66][200/200] */
130 {0, 4, 4, 1, 3, 1, 4, 1, 3, 0, 0},
132 /* L1 : [800/200/100][166/83][133/66][200/200] */
133 {0, 3, 3, 1, 3, 1, 4, 1, 3, 0, 0},
135 /* L2 : [400/200/100][166/83][133/66][200/200] */
136 {1, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0},
138 /* L3 : [200/200/100][166/83][133/66][200/200] */
139 {3, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0},
141 /* L4 : [100/100/100][83/83][66/66][100/100] */
142 {7, 7, 0, 0, 7, 0, 9, 0, 7, 0, 0},
146 * This function set DRAM refresh counter
147 * accoriding to operating frequency of DRAM
148 * ch: DMC port number 0 or 1
149 * freq: Operating frequency of DRAM(KHz)
151 static void s5pv210_set_refresh(enum s5pv210_dmc_port ch
, unsigned long freq
)
153 unsigned long tmp
, tmp1
;
154 void __iomem
*reg
= NULL
;
157 reg
= (S5P_VA_DMC0
+ 0x30);
158 } else if (ch
== DMC1
) {
159 reg
= (S5P_VA_DMC1
+ 0x30);
161 printk(KERN_ERR
"Cannot find DMC port\n");
165 /* Find current DRAM frequency */
166 tmp
= s5pv210_dram_conf
[ch
].freq
;
170 tmp1
= s5pv210_dram_conf
[ch
].refresh
;
174 __raw_writel(tmp1
, reg
);
177 static unsigned int s5pv210_getspeed(unsigned int cpu
)
182 return clk_get_rate(cpu_clk
) / 1000;
185 static int s5pv210_target(struct cpufreq_policy
*policy
,
186 unsigned int target_freq
,
187 unsigned int relation
)
190 unsigned int index
, priv_index
;
191 unsigned int pll_changing
= 0;
192 unsigned int bus_speed_changing
= 0;
193 int arm_volt
, int_volt
;
196 mutex_lock(&set_freq_lock
);
198 if (relation
& ENABLE_FURTHER_CPUFREQ
)
199 no_cpufreq_access
= false;
201 if (no_cpufreq_access
) {
202 #ifdef CONFIG_PM_VERBOSE
203 pr_err("%s:%d denied access to %s as it is disabled"
204 "temporarily\n", __FILE__
, __LINE__
, __func__
);
210 if (relation
& DISABLE_FURTHER_CPUFREQ
)
211 no_cpufreq_access
= true;
213 relation
&= ~(ENABLE_FURTHER_CPUFREQ
| DISABLE_FURTHER_CPUFREQ
);
215 freqs
.old
= s5pv210_getspeed(0);
217 if (cpufreq_frequency_table_target(policy
, s5pv210_freq_table
,
218 target_freq
, relation
, &index
)) {
223 freqs
.new = s5pv210_freq_table
[index
].frequency
;
225 if (freqs
.new == freqs
.old
)
228 /* Finding current running level index */
229 if (cpufreq_frequency_table_target(policy
, s5pv210_freq_table
,
230 freqs
.old
, relation
, &priv_index
)) {
235 arm_volt
= dvs_conf
[index
].arm_volt
;
236 int_volt
= dvs_conf
[index
].int_volt
;
238 if (freqs
.new > freqs
.old
) {
239 ret
= regulator_set_voltage(arm_regulator
,
240 arm_volt
, arm_volt_max
);
244 ret
= regulator_set_voltage(int_regulator
,
245 int_volt
, int_volt_max
);
250 cpufreq_notify_transition(policy
, &freqs
, CPUFREQ_PRECHANGE
);
252 /* Check if there need to change PLL */
253 if ((index
== L0
) || (priv_index
== L0
))
256 /* Check if there need to change System bus clock */
257 if ((index
== L4
) || (priv_index
== L4
))
258 bus_speed_changing
= 1;
260 if (bus_speed_changing
) {
262 * Reconfigure DRAM refresh counter value for minimum
263 * temporary clock while changing divider.
264 * expected clock is 83Mhz : 7.8usec/(1/83Mhz) = 0x287
267 s5pv210_set_refresh(DMC1
, 83000);
269 s5pv210_set_refresh(DMC1
, 100000);
271 s5pv210_set_refresh(DMC0
, 83000);
275 * APLL should be changed in this level
276 * APLL -> MPLL(for stable transition) -> APLL
277 * Some clock source's clock API are not prepared.
278 * Do not use clock API in below code.
282 * 1. Temporary Change divider for MFC and G3D
283 * SCLKA2M(200/1=200)->(200/4=50)Mhz
285 reg
= __raw_readl(S5P_CLK_DIV2
);
286 reg
&= ~(S5P_CLKDIV2_G3D_MASK
| S5P_CLKDIV2_MFC_MASK
);
287 reg
|= (3 << S5P_CLKDIV2_G3D_SHIFT
) |
288 (3 << S5P_CLKDIV2_MFC_SHIFT
);
289 __raw_writel(reg
, S5P_CLK_DIV2
);
291 /* For MFC, G3D dividing */
293 reg
= __raw_readl(S5P_CLKDIV_STAT0
);
294 } while (reg
& ((1 << 16) | (1 << 17)));
297 * 2. Change SCLKA2M(200Mhz)to SCLKMPLL in MFC_MUX, G3D MUX
298 * (200/4=50)->(667/4=166)Mhz
300 reg
= __raw_readl(S5P_CLK_SRC2
);
301 reg
&= ~(S5P_CLKSRC2_G3D_MASK
| S5P_CLKSRC2_MFC_MASK
);
302 reg
|= (1 << S5P_CLKSRC2_G3D_SHIFT
) |
303 (1 << S5P_CLKSRC2_MFC_SHIFT
);
304 __raw_writel(reg
, S5P_CLK_SRC2
);
307 reg
= __raw_readl(S5P_CLKMUX_STAT1
);
308 } while (reg
& ((1 << 7) | (1 << 3)));
311 * 3. DMC1 refresh count for 133Mhz if (index == L4) is
312 * true refresh counter is already programed in upper
315 if (!bus_speed_changing
)
316 s5pv210_set_refresh(DMC1
, 133000);
318 /* 4. SCLKAPLL -> SCLKMPLL */
319 reg
= __raw_readl(S5P_CLK_SRC0
);
320 reg
&= ~(S5P_CLKSRC0_MUX200_MASK
);
321 reg
|= (0x1 << S5P_CLKSRC0_MUX200_SHIFT
);
322 __raw_writel(reg
, S5P_CLK_SRC0
);
325 reg
= __raw_readl(S5P_CLKMUX_STAT0
);
326 } while (reg
& (0x1 << 18));
331 reg
= __raw_readl(S5P_CLK_DIV0
);
333 reg
&= ~(S5P_CLKDIV0_APLL_MASK
| S5P_CLKDIV0_A2M_MASK
|
334 S5P_CLKDIV0_HCLK200_MASK
| S5P_CLKDIV0_PCLK100_MASK
|
335 S5P_CLKDIV0_HCLK166_MASK
| S5P_CLKDIV0_PCLK83_MASK
|
336 S5P_CLKDIV0_HCLK133_MASK
| S5P_CLKDIV0_PCLK66_MASK
);
338 reg
|= ((clkdiv_val
[index
][0] << S5P_CLKDIV0_APLL_SHIFT
) |
339 (clkdiv_val
[index
][1] << S5P_CLKDIV0_A2M_SHIFT
) |
340 (clkdiv_val
[index
][2] << S5P_CLKDIV0_HCLK200_SHIFT
) |
341 (clkdiv_val
[index
][3] << S5P_CLKDIV0_PCLK100_SHIFT
) |
342 (clkdiv_val
[index
][4] << S5P_CLKDIV0_HCLK166_SHIFT
) |
343 (clkdiv_val
[index
][5] << S5P_CLKDIV0_PCLK83_SHIFT
) |
344 (clkdiv_val
[index
][6] << S5P_CLKDIV0_HCLK133_SHIFT
) |
345 (clkdiv_val
[index
][7] << S5P_CLKDIV0_PCLK66_SHIFT
));
347 __raw_writel(reg
, S5P_CLK_DIV0
);
350 reg
= __raw_readl(S5P_CLKDIV_STAT0
);
351 } while (reg
& 0xff);
353 /* ARM MCS value changed */
354 reg
= __raw_readl(S5P_ARM_MCS_CON
);
361 __raw_writel(reg
, S5P_ARM_MCS_CON
);
364 /* 5. Set Lock time = 30us*24Mhz = 0x2cf */
365 __raw_writel(0x2cf, S5P_APLL_LOCK
);
369 * 6-1. Set PMS values
370 * 6-2. Wait untile the PLL is locked
373 __raw_writel(APLL_VAL_1000
, S5P_APLL_CON
);
375 __raw_writel(APLL_VAL_800
, S5P_APLL_CON
);
378 reg
= __raw_readl(S5P_APLL_CON
);
379 } while (!(reg
& (0x1 << 29)));
382 * 7. Change souce clock from SCLKMPLL(667Mhz)
383 * to SCLKA2M(200Mhz) in MFC_MUX and G3D MUX
384 * (667/4=166)->(200/4=50)Mhz
386 reg
= __raw_readl(S5P_CLK_SRC2
);
387 reg
&= ~(S5P_CLKSRC2_G3D_MASK
| S5P_CLKSRC2_MFC_MASK
);
388 reg
|= (0 << S5P_CLKSRC2_G3D_SHIFT
) |
389 (0 << S5P_CLKSRC2_MFC_SHIFT
);
390 __raw_writel(reg
, S5P_CLK_SRC2
);
393 reg
= __raw_readl(S5P_CLKMUX_STAT1
);
394 } while (reg
& ((1 << 7) | (1 << 3)));
397 * 8. Change divider for MFC and G3D
398 * (200/4=50)->(200/1=200)Mhz
400 reg
= __raw_readl(S5P_CLK_DIV2
);
401 reg
&= ~(S5P_CLKDIV2_G3D_MASK
| S5P_CLKDIV2_MFC_MASK
);
402 reg
|= (clkdiv_val
[index
][10] << S5P_CLKDIV2_G3D_SHIFT
) |
403 (clkdiv_val
[index
][9] << S5P_CLKDIV2_MFC_SHIFT
);
404 __raw_writel(reg
, S5P_CLK_DIV2
);
406 /* For MFC, G3D dividing */
408 reg
= __raw_readl(S5P_CLKDIV_STAT0
);
409 } while (reg
& ((1 << 16) | (1 << 17)));
411 /* 9. Change MPLL to APLL in MSYS_MUX */
412 reg
= __raw_readl(S5P_CLK_SRC0
);
413 reg
&= ~(S5P_CLKSRC0_MUX200_MASK
);
414 reg
|= (0x0 << S5P_CLKSRC0_MUX200_SHIFT
);
415 __raw_writel(reg
, S5P_CLK_SRC0
);
418 reg
= __raw_readl(S5P_CLKMUX_STAT0
);
419 } while (reg
& (0x1 << 18));
422 * 10. DMC1 refresh counter
423 * L4 : DMC1 = 100Mhz 7.8us/(1/100) = 0x30c
424 * Others : DMC1 = 200Mhz 7.8us/(1/200) = 0x618
426 if (!bus_speed_changing
)
427 s5pv210_set_refresh(DMC1
, 200000);
431 * L4 level need to change memory bus speed, hence onedram clock divier
432 * and memory refresh parameter should be changed
434 if (bus_speed_changing
) {
435 reg
= __raw_readl(S5P_CLK_DIV6
);
436 reg
&= ~S5P_CLKDIV6_ONEDRAM_MASK
;
437 reg
|= (clkdiv_val
[index
][8] << S5P_CLKDIV6_ONEDRAM_SHIFT
);
438 __raw_writel(reg
, S5P_CLK_DIV6
);
441 reg
= __raw_readl(S5P_CLKDIV_STAT1
);
442 } while (reg
& (1 << 15));
444 /* Reconfigure DRAM refresh counter value */
450 s5pv210_set_refresh(DMC0
, 166000);
451 s5pv210_set_refresh(DMC1
, 200000);
457 s5pv210_set_refresh(DMC0
, 83000);
458 s5pv210_set_refresh(DMC1
, 100000);
462 cpufreq_notify_transition(policy
, &freqs
, CPUFREQ_POSTCHANGE
);
464 if (freqs
.new < freqs
.old
) {
465 regulator_set_voltage(int_regulator
,
466 int_volt
, int_volt_max
);
468 regulator_set_voltage(arm_regulator
,
469 arm_volt
, arm_volt_max
);
472 printk(KERN_DEBUG
"Perf changed[L%d]\n", index
);
475 mutex_unlock(&set_freq_lock
);
480 static int s5pv210_cpufreq_suspend(struct cpufreq_policy
*policy
)
485 static int s5pv210_cpufreq_resume(struct cpufreq_policy
*policy
)
491 static int check_mem_type(void __iomem
*dmc_reg
)
495 val
= __raw_readl(dmc_reg
+ 0x4);
496 val
= (val
& (0xf << 8));
501 static int __init
s5pv210_cpu_init(struct cpufreq_policy
*policy
)
503 unsigned long mem_type
;
506 cpu_clk
= clk_get(NULL
, "armclk");
508 return PTR_ERR(cpu_clk
);
510 dmc0_clk
= clk_get(NULL
, "sclk_dmc0");
511 if (IS_ERR(dmc0_clk
)) {
512 ret
= PTR_ERR(dmc0_clk
);
516 dmc1_clk
= clk_get(NULL
, "hclk_msys");
517 if (IS_ERR(dmc1_clk
)) {
518 ret
= PTR_ERR(dmc1_clk
);
522 if (policy
->cpu
!= 0) {
528 * check_mem_type : This driver only support LPDDR & LPDDR2.
529 * other memory type is not supported.
531 mem_type
= check_mem_type(S5P_VA_DMC0
);
533 if ((mem_type
!= LPDDR
) && (mem_type
!= LPDDR2
)) {
534 printk(KERN_ERR
"CPUFreq doesn't support this memory type\n");
539 /* Find current refresh counter and frequency each DMC */
540 s5pv210_dram_conf
[0].refresh
= (__raw_readl(S5P_VA_DMC0
+ 0x30) * 1000);
541 s5pv210_dram_conf
[0].freq
= clk_get_rate(dmc0_clk
);
543 s5pv210_dram_conf
[1].refresh
= (__raw_readl(S5P_VA_DMC1
+ 0x30) * 1000);
544 s5pv210_dram_conf
[1].freq
= clk_get_rate(dmc1_clk
);
546 return cpufreq_generic_init(policy
, s5pv210_freq_table
, 40000);
555 static int s5pv210_cpufreq_notifier_event(struct notifier_block
*this,
556 unsigned long event
, void *ptr
)
561 case PM_SUSPEND_PREPARE
:
562 ret
= cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ
,
563 DISABLE_FURTHER_CPUFREQ
);
568 case PM_POST_RESTORE
:
569 case PM_POST_SUSPEND
:
570 cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ
,
571 ENABLE_FURTHER_CPUFREQ
);
579 static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block
*this,
580 unsigned long event
, void *ptr
)
584 ret
= cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ
,
585 DISABLE_FURTHER_CPUFREQ
);
592 static struct cpufreq_driver s5pv210_driver
= {
593 .flags
= CPUFREQ_STICKY
,
594 .verify
= cpufreq_generic_frequency_table_verify
,
595 .target
= s5pv210_target
,
596 .get
= s5pv210_getspeed
,
597 .init
= s5pv210_cpu_init
,
600 .suspend
= s5pv210_cpufreq_suspend
,
601 .resume
= s5pv210_cpufreq_resume
,
605 static struct notifier_block s5pv210_cpufreq_notifier
= {
606 .notifier_call
= s5pv210_cpufreq_notifier_event
,
609 static struct notifier_block s5pv210_cpufreq_reboot_notifier
= {
610 .notifier_call
= s5pv210_cpufreq_reboot_notifier_event
,
613 static int __init
s5pv210_cpufreq_init(void)
615 arm_regulator
= regulator_get(NULL
, "vddarm");
616 if (IS_ERR(arm_regulator
)) {
617 pr_err("failed to get regulator vddarm");
618 return PTR_ERR(arm_regulator
);
621 int_regulator
= regulator_get(NULL
, "vddint");
622 if (IS_ERR(int_regulator
)) {
623 pr_err("failed to get regulator vddint");
624 regulator_put(arm_regulator
);
625 return PTR_ERR(int_regulator
);
628 register_pm_notifier(&s5pv210_cpufreq_notifier
);
629 register_reboot_notifier(&s5pv210_cpufreq_reboot_notifier
);
631 return cpufreq_register_driver(&s5pv210_driver
);
634 late_initcall(s5pv210_cpufreq_init
);