Commit | Line | Data |
---|---|---|
1dd538f0 SG |
1 | /* |
2 | * Copyright (C) 2013 Freescale Semiconductor, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/clk.h> | |
b494b48d | 10 | #include <linux/cpu.h> |
1dd538f0 | 11 | #include <linux/cpufreq.h> |
a1d00154 | 12 | #include <linux/cpu_cooling.h> |
1dd538f0 SG |
13 | #include <linux/err.h> |
14 | #include <linux/module.h> | |
2733fb0d | 15 | #include <linux/nvmem-consumer.h> |
1dd538f0 | 16 | #include <linux/of.h> |
2b3d58a3 | 17 | #include <linux/of_address.h> |
e4db1c74 | 18 | #include <linux/pm_opp.h> |
1dd538f0 SG |
19 | #include <linux/platform_device.h> |
20 | #include <linux/regulator/consumer.h> | |
21 | ||
22 | #define PU_SOC_VOLTAGE_NORMAL 1250000 | |
23 | #define PU_SOC_VOLTAGE_HIGH 1275000 | |
24 | #define FREQ_1P2_GHZ 1200000000 | |
25 | ||
26 | static struct regulator *arm_reg; | |
27 | static struct regulator *pu_reg; | |
28 | static struct regulator *soc_reg; | |
29 | ||
2332bd04 DA |
30 | enum IMX6_CPUFREQ_CLKS { |
31 | ARM, | |
32 | PLL1_SYS, | |
33 | STEP, | |
34 | PLL1_SW, | |
35 | PLL2_PFD2_396M, | |
36 | /* MX6UL requires two more clks */ | |
37 | PLL2_BUS, | |
38 | SECONDARY_SEL, | |
39 | }; | |
40 | #define IMX6Q_CPUFREQ_CLK_NUM 5 | |
41 | #define IMX6UL_CPUFREQ_CLK_NUM 7 | |
42 | ||
43 | static int num_clks; | |
44 | static struct clk_bulk_data clks[] = { | |
45 | { .id = "arm" }, | |
46 | { .id = "pll1_sys" }, | |
47 | { .id = "step" }, | |
48 | { .id = "pll1_sw" }, | |
49 | { .id = "pll2_pfd2_396m" }, | |
50 | { .id = "pll2_bus" }, | |
51 | { .id = "secondary_sel" }, | |
52 | }; | |
a35fc5a3 | 53 | |
1dd538f0 | 54 | static struct device *cpu_dev; |
a1d00154 | 55 | static struct thermal_cooling_device *cdev; |
cc87b8a8 | 56 | static bool free_opp; |
1dd538f0 | 57 | static struct cpufreq_frequency_table *freq_table; |
8d768cdc | 58 | static unsigned int max_freq; |
1dd538f0 SG |
59 | static unsigned int transition_latency; |
60 | ||
b4573d1d AH |
61 | static u32 *imx6_soc_volt; |
62 | static u32 soc_opp_count; | |
63 | ||
9c0ebcf7 | 64 | static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index) |
1dd538f0 | 65 | { |
47d43ba7 | 66 | struct dev_pm_opp *opp; |
1dd538f0 | 67 | unsigned long freq_hz, volt, volt_old; |
d4019f0a | 68 | unsigned int old_freq, new_freq; |
fded5fc8 | 69 | bool pll1_sys_temp_enabled = false; |
1dd538f0 SG |
70 | int ret; |
71 | ||
d4019f0a VK |
72 | new_freq = freq_table[index].frequency; |
73 | freq_hz = new_freq * 1000; | |
2332bd04 | 74 | old_freq = clk_get_rate(clks[ARM].clk) / 1000; |
1dd538f0 | 75 | |
5d4879cd | 76 | opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz); |
1dd538f0 | 77 | if (IS_ERR(opp)) { |
1dd538f0 SG |
78 | dev_err(cpu_dev, "failed to find OPP for %ld\n", freq_hz); |
79 | return PTR_ERR(opp); | |
80 | } | |
81 | ||
5d4879cd | 82 | volt = dev_pm_opp_get_voltage(opp); |
8a31d9d9 VK |
83 | dev_pm_opp_put(opp); |
84 | ||
1dd538f0 SG |
85 | volt_old = regulator_get_voltage(arm_reg); |
86 | ||
87 | dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n", | |
d4019f0a VK |
88 | old_freq / 1000, volt_old / 1000, |
89 | new_freq / 1000, volt / 1000); | |
5a571c35 | 90 | |
1dd538f0 | 91 | /* scaling up? scale voltage before frequency */ |
d4019f0a | 92 | if (new_freq > old_freq) { |
22d0628a AH |
93 | if (!IS_ERR(pu_reg)) { |
94 | ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0); | |
95 | if (ret) { | |
96 | dev_err(cpu_dev, "failed to scale vddpu up: %d\n", ret); | |
97 | return ret; | |
98 | } | |
b4573d1d AH |
99 | } |
100 | ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0); | |
101 | if (ret) { | |
102 | dev_err(cpu_dev, "failed to scale vddsoc up: %d\n", ret); | |
103 | return ret; | |
104 | } | |
1dd538f0 SG |
105 | ret = regulator_set_voltage_tol(arm_reg, volt, 0); |
106 | if (ret) { | |
107 | dev_err(cpu_dev, | |
108 | "failed to scale vddarm up: %d\n", ret); | |
d4019f0a | 109 | return ret; |
1dd538f0 | 110 | } |
1dd538f0 SG |
111 | } |
112 | ||
113 | /* | |
114 | * The setpoints are selected per PLL/PDF frequencies, so we need to | |
115 | * reprogram PLL for frequency scaling. The procedure of reprogramming | |
116 | * PLL1 is as below. | |
a35fc5a3 BP |
117 | * For i.MX6UL, it has a secondary clk mux, the cpu frequency change |
118 | * flow is slightly different from other i.MX6 OSC. | |
119 | * The cpu frequeny change flow for i.MX6(except i.MX6UL) is as below: | |
1dd538f0 SG |
120 | * - Enable pll2_pfd2_396m_clk and reparent pll1_sw_clk to it |
121 | * - Reprogram pll1_sys_clk and reparent pll1_sw_clk back to it | |
122 | * - Disable pll2_pfd2_396m_clk | |
123 | */ | |
3fafb4e7 OP |
124 | if (of_machine_is_compatible("fsl,imx6ul") || |
125 | of_machine_is_compatible("fsl,imx6ull")) { | |
a35fc5a3 BP |
126 | /* |
127 | * When changing pll1_sw_clk's parent to pll1_sys_clk, | |
128 | * CPU may run at higher than 528MHz, this will lead to | |
129 | * the system unstable if the voltage is lower than the | |
130 | * voltage of 528MHz, so lower the CPU frequency to one | |
131 | * half before changing CPU frequency. | |
132 | */ | |
2332bd04 DA |
133 | clk_set_rate(clks[ARM].clk, (old_freq >> 1) * 1000); |
134 | clk_set_parent(clks[PLL1_SW].clk, clks[PLL1_SYS].clk); | |
135 | if (freq_hz > clk_get_rate(clks[PLL2_PFD2_396M].clk)) | |
136 | clk_set_parent(clks[SECONDARY_SEL].clk, | |
137 | clks[PLL2_BUS].clk); | |
a35fc5a3 | 138 | else |
2332bd04 DA |
139 | clk_set_parent(clks[SECONDARY_SEL].clk, |
140 | clks[PLL2_PFD2_396M].clk); | |
141 | clk_set_parent(clks[STEP].clk, clks[SECONDARY_SEL].clk); | |
142 | clk_set_parent(clks[PLL1_SW].clk, clks[STEP].clk); | |
5028f5d2 AH |
143 | if (freq_hz > clk_get_rate(clks[PLL2_BUS].clk)) { |
144 | clk_set_rate(clks[PLL1_SYS].clk, new_freq * 1000); | |
145 | clk_set_parent(clks[PLL1_SW].clk, clks[PLL1_SYS].clk); | |
146 | } | |
a35fc5a3 | 147 | } else { |
2332bd04 DA |
148 | clk_set_parent(clks[STEP].clk, clks[PLL2_PFD2_396M].clk); |
149 | clk_set_parent(clks[PLL1_SW].clk, clks[STEP].clk); | |
150 | if (freq_hz > clk_get_rate(clks[PLL2_PFD2_396M].clk)) { | |
151 | clk_set_rate(clks[PLL1_SYS].clk, new_freq * 1000); | |
152 | clk_set_parent(clks[PLL1_SW].clk, clks[PLL1_SYS].clk); | |
fded5fc8 LC |
153 | } else { |
154 | /* pll1_sys needs to be enabled for divider rate change to work. */ | |
155 | pll1_sys_temp_enabled = true; | |
2332bd04 | 156 | clk_prepare_enable(clks[PLL1_SYS].clk); |
a35fc5a3 | 157 | } |
1dd538f0 SG |
158 | } |
159 | ||
160 | /* Ensure the arm clock divider is what we expect */ | |
2332bd04 | 161 | ret = clk_set_rate(clks[ARM].clk, new_freq * 1000); |
1dd538f0 | 162 | if (ret) { |
6ef28a04 AH |
163 | int ret1; |
164 | ||
1dd538f0 | 165 | dev_err(cpu_dev, "failed to set clock rate: %d\n", ret); |
6ef28a04 AH |
166 | ret1 = regulator_set_voltage_tol(arm_reg, volt_old, 0); |
167 | if (ret1) | |
168 | dev_warn(cpu_dev, | |
169 | "failed to restore vddarm voltage: %d\n", ret1); | |
d4019f0a | 170 | return ret; |
1dd538f0 SG |
171 | } |
172 | ||
fded5fc8 LC |
173 | /* PLL1 is only needed until after ARM-PODF is set. */ |
174 | if (pll1_sys_temp_enabled) | |
2332bd04 | 175 | clk_disable_unprepare(clks[PLL1_SYS].clk); |
fded5fc8 | 176 | |
1dd538f0 | 177 | /* scaling down? scale voltage after frequency */ |
d4019f0a | 178 | if (new_freq < old_freq) { |
1dd538f0 | 179 | ret = regulator_set_voltage_tol(arm_reg, volt, 0); |
58ad4e61 | 180 | if (ret) |
1dd538f0 SG |
181 | dev_warn(cpu_dev, |
182 | "failed to scale vddarm down: %d\n", ret); | |
b4573d1d | 183 | ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0); |
58ad4e61 | 184 | if (ret) |
b4573d1d | 185 | dev_warn(cpu_dev, "failed to scale vddsoc down: %d\n", ret); |
22d0628a AH |
186 | if (!IS_ERR(pu_reg)) { |
187 | ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0); | |
58ad4e61 | 188 | if (ret) |
22d0628a | 189 | dev_warn(cpu_dev, "failed to scale vddpu down: %d\n", ret); |
1dd538f0 SG |
190 | } |
191 | } | |
192 | ||
d4019f0a | 193 | return 0; |
1dd538f0 SG |
194 | } |
195 | ||
a1d00154 BS |
196 | static void imx6q_cpufreq_ready(struct cpufreq_policy *policy) |
197 | { | |
198 | cdev = of_cpufreq_cooling_register(policy); | |
199 | ||
200 | if (!cdev) | |
201 | dev_err(cpu_dev, | |
202 | "running cpufreq without cooling device: %ld\n", | |
203 | PTR_ERR(cdev)); | |
204 | } | |
205 | ||
1dd538f0 SG |
206 | static int imx6q_cpufreq_init(struct cpufreq_policy *policy) |
207 | { | |
5aa1599f LC |
208 | int ret; |
209 | ||
2332bd04 | 210 | policy->clk = clks[ARM].clk; |
5aa1599f | 211 | ret = cpufreq_generic_init(policy, freq_table, transition_latency); |
8d768cdc | 212 | policy->suspend_freq = max_freq; |
5aa1599f LC |
213 | |
214 | return ret; | |
1dd538f0 SG |
215 | } |
216 | ||
a1d00154 BS |
217 | static int imx6q_cpufreq_exit(struct cpufreq_policy *policy) |
218 | { | |
219 | cpufreq_cooling_unregister(cdev); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
1dd538f0 | 224 | static struct cpufreq_driver imx6q_cpufreq_driver = { |
ae6b4271 | 225 | .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
4f6ba385 | 226 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 227 | .target_index = imx6q_set_target, |
652ed95d | 228 | .get = cpufreq_generic_get, |
1dd538f0 | 229 | .init = imx6q_cpufreq_init, |
a1d00154 | 230 | .exit = imx6q_cpufreq_exit, |
1dd538f0 | 231 | .name = "imx6q-cpufreq", |
a1d00154 | 232 | .ready = imx6q_cpufreq_ready, |
4f6ba385 | 233 | .attr = cpufreq_generic_attr, |
5aa1599f | 234 | .suspend = cpufreq_generic_suspend, |
1dd538f0 SG |
235 | }; |
236 | ||
2b3d58a3 FE |
237 | #define OCOTP_CFG3 0x440 |
238 | #define OCOTP_CFG3_SPEED_SHIFT 16 | |
239 | #define OCOTP_CFG3_SPEED_1P2GHZ 0x3 | |
240 | #define OCOTP_CFG3_SPEED_996MHZ 0x2 | |
241 | #define OCOTP_CFG3_SPEED_852MHZ 0x1 | |
242 | ||
243 | static void imx6q_opp_check_speed_grading(struct device *dev) | |
244 | { | |
245 | struct device_node *np; | |
246 | void __iomem *base; | |
247 | u32 val; | |
248 | ||
249 | np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp"); | |
250 | if (!np) | |
251 | return; | |
252 | ||
253 | base = of_iomap(np, 0); | |
254 | if (!base) { | |
255 | dev_err(dev, "failed to map ocotp\n"); | |
256 | goto put_node; | |
257 | } | |
258 | ||
259 | /* | |
260 | * SPEED_GRADING[1:0] defines the max speed of ARM: | |
261 | * 2b'11: 1200000000Hz; | |
262 | * 2b'10: 996000000Hz; | |
263 | * 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz. | |
264 | * 2b'00: 792000000Hz; | |
265 | * We need to set the max speed of ARM according to fuse map. | |
266 | */ | |
267 | val = readl_relaxed(base + OCOTP_CFG3); | |
268 | val >>= OCOTP_CFG3_SPEED_SHIFT; | |
269 | val &= 0x3; | |
270 | ||
2b3d58a3 FE |
271 | if (val < OCOTP_CFG3_SPEED_996MHZ) |
272 | if (dev_pm_opp_disable(dev, 996000000)) | |
273 | dev_warn(dev, "failed to disable 996MHz OPP\n"); | |
ccc153a6 LS |
274 | |
275 | if (of_machine_is_compatible("fsl,imx6q") || | |
276 | of_machine_is_compatible("fsl,imx6qp")) { | |
2b3d58a3 FE |
277 | if (val != OCOTP_CFG3_SPEED_852MHZ) |
278 | if (dev_pm_opp_disable(dev, 852000000)) | |
279 | dev_warn(dev, "failed to disable 852MHz OPP\n"); | |
ccc153a6 LS |
280 | if (val != OCOTP_CFG3_SPEED_1P2GHZ) |
281 | if (dev_pm_opp_disable(dev, 1200000000)) | |
282 | dev_warn(dev, "failed to disable 1.2GHz OPP\n"); | |
2b3d58a3 FE |
283 | } |
284 | iounmap(base); | |
285 | put_node: | |
286 | of_node_put(np); | |
287 | } | |
288 | ||
5028f5d2 | 289 | #define OCOTP_CFG3_6UL_SPEED_696MHZ 0x2 |
0aa9abd4 SS |
290 | #define OCOTP_CFG3_6ULL_SPEED_792MHZ 0x2 |
291 | #define OCOTP_CFG3_6ULL_SPEED_900MHZ 0x3 | |
5028f5d2 | 292 | |
2733fb0d | 293 | static int imx6ul_opp_check_speed_grading(struct device *dev) |
5028f5d2 | 294 | { |
5028f5d2 | 295 | u32 val; |
2733fb0d | 296 | int ret = 0; |
5028f5d2 | 297 | |
2733fb0d AH |
298 | if (of_find_property(dev->of_node, "nvmem-cells", NULL)) { |
299 | ret = nvmem_cell_read_u32(dev, "speed_grade", &val); | |
300 | if (ret) | |
301 | return ret; | |
302 | } else { | |
303 | struct device_node *np; | |
304 | void __iomem *base; | |
305 | ||
306 | np = of_find_compatible_node(NULL, NULL, "fsl,imx6ul-ocotp"); | |
307 | if (!np) | |
308 | return -ENOENT; | |
309 | ||
310 | base = of_iomap(np, 0); | |
311 | of_node_put(np); | |
312 | if (!base) { | |
313 | dev_err(dev, "failed to map ocotp\n"); | |
314 | return -EFAULT; | |
315 | } | |
5028f5d2 | 316 | |
2733fb0d AH |
317 | val = readl_relaxed(base + OCOTP_CFG3); |
318 | iounmap(base); | |
5028f5d2 AH |
319 | } |
320 | ||
321 | /* | |
322 | * Speed GRADING[1:0] defines the max speed of ARM: | |
323 | * 2b'00: Reserved; | |
324 | * 2b'01: 528000000Hz; | |
0aa9abd4 SS |
325 | * 2b'10: 696000000Hz on i.MX6UL, 792000000Hz on i.MX6ULL; |
326 | * 2b'11: 900000000Hz on i.MX6ULL only; | |
5028f5d2 AH |
327 | * We need to set the max speed of ARM according to fuse map. |
328 | */ | |
5028f5d2 AH |
329 | val >>= OCOTP_CFG3_SPEED_SHIFT; |
330 | val &= 0x3; | |
0aa9abd4 SS |
331 | |
332 | if (of_machine_is_compatible("fsl,imx6ul")) { | |
333 | if (val != OCOTP_CFG3_6UL_SPEED_696MHZ) | |
334 | if (dev_pm_opp_disable(dev, 696000000)) | |
335 | dev_warn(dev, "failed to disable 696MHz OPP\n"); | |
336 | } | |
337 | ||
338 | if (of_machine_is_compatible("fsl,imx6ull")) { | |
339 | if (val != OCOTP_CFG3_6ULL_SPEED_792MHZ) | |
340 | if (dev_pm_opp_disable(dev, 792000000)) | |
341 | dev_warn(dev, "failed to disable 792MHz OPP\n"); | |
342 | ||
343 | if (val != OCOTP_CFG3_6ULL_SPEED_900MHZ) | |
344 | if (dev_pm_opp_disable(dev, 900000000)) | |
345 | dev_warn(dev, "failed to disable 900MHz OPP\n"); | |
346 | } | |
347 | ||
2733fb0d | 348 | return ret; |
5028f5d2 AH |
349 | } |
350 | ||
1dd538f0 SG |
351 | static int imx6q_cpufreq_probe(struct platform_device *pdev) |
352 | { | |
353 | struct device_node *np; | |
47d43ba7 | 354 | struct dev_pm_opp *opp; |
1dd538f0 SG |
355 | unsigned long min_volt, max_volt; |
356 | int num, ret; | |
b4573d1d AH |
357 | const struct property *prop; |
358 | const __be32 *val; | |
359 | u32 nr, i, j; | |
1dd538f0 | 360 | |
b494b48d SK |
361 | cpu_dev = get_cpu_device(0); |
362 | if (!cpu_dev) { | |
363 | pr_err("failed to get cpu0 device\n"); | |
364 | return -ENODEV; | |
365 | } | |
1dd538f0 | 366 | |
cdc58d60 | 367 | np = of_node_get(cpu_dev->of_node); |
1dd538f0 SG |
368 | if (!np) { |
369 | dev_err(cpu_dev, "failed to find cpu0 node\n"); | |
370 | return -ENOENT; | |
371 | } | |
372 | ||
3fafb4e7 | 373 | if (of_machine_is_compatible("fsl,imx6ul") || |
2332bd04 DA |
374 | of_machine_is_compatible("fsl,imx6ull")) |
375 | num_clks = IMX6UL_CPUFREQ_CLK_NUM; | |
376 | else | |
377 | num_clks = IMX6Q_CPUFREQ_CLK_NUM; | |
378 | ||
379 | ret = clk_bulk_get(cpu_dev, num_clks, clks); | |
380 | if (ret) | |
381 | goto put_node; | |
a35fc5a3 | 382 | |
f8269c19 | 383 | arm_reg = regulator_get(cpu_dev, "arm"); |
22d0628a | 384 | pu_reg = regulator_get_optional(cpu_dev, "pu"); |
f8269c19 | 385 | soc_reg = regulator_get(cpu_dev, "soc"); |
54cad2fc IT |
386 | if (PTR_ERR(arm_reg) == -EPROBE_DEFER || |
387 | PTR_ERR(soc_reg) == -EPROBE_DEFER || | |
388 | PTR_ERR(pu_reg) == -EPROBE_DEFER) { | |
389 | ret = -EPROBE_DEFER; | |
390 | dev_dbg(cpu_dev, "regulators not ready, defer\n"); | |
391 | goto put_reg; | |
392 | } | |
22d0628a | 393 | if (IS_ERR(arm_reg) || IS_ERR(soc_reg)) { |
1dd538f0 SG |
394 | dev_err(cpu_dev, "failed to get regulators\n"); |
395 | ret = -ENOENT; | |
f8269c19 | 396 | goto put_reg; |
1dd538f0 SG |
397 | } |
398 | ||
2b3d58a3 FE |
399 | ret = dev_pm_opp_of_add_table(cpu_dev); |
400 | if (ret < 0) { | |
401 | dev_err(cpu_dev, "failed to init OPP table: %d\n", ret); | |
402 | goto put_reg; | |
403 | } | |
20b7cbe2 | 404 | |
0aa9abd4 | 405 | if (of_machine_is_compatible("fsl,imx6ul") || |
2733fb0d AH |
406 | of_machine_is_compatible("fsl,imx6ull")) { |
407 | ret = imx6ul_opp_check_speed_grading(cpu_dev); | |
2733fb0d | 408 | if (ret) { |
cccf6ae5 AH |
409 | if (ret == -EPROBE_DEFER) |
410 | return ret; | |
411 | ||
2733fb0d AH |
412 | dev_err(cpu_dev, "failed to read ocotp: %d\n", |
413 | ret); | |
414 | return ret; | |
415 | } | |
416 | } else { | |
5028f5d2 | 417 | imx6q_opp_check_speed_grading(cpu_dev); |
2733fb0d | 418 | } |
cc87b8a8 | 419 | |
2b3d58a3 FE |
420 | /* Because we have added the OPPs here, we must free them */ |
421 | free_opp = true; | |
422 | num = dev_pm_opp_get_opp_count(cpu_dev); | |
423 | if (num < 0) { | |
424 | ret = num; | |
425 | dev_err(cpu_dev, "no OPP table is found: %d\n", ret); | |
426 | goto out_free_opp; | |
1dd538f0 SG |
427 | } |
428 | ||
5d4879cd | 429 | ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); |
1dd538f0 SG |
430 | if (ret) { |
431 | dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); | |
eafca851 | 432 | goto out_free_opp; |
1dd538f0 SG |
433 | } |
434 | ||
b4573d1d | 435 | /* Make imx6_soc_volt array's size same as arm opp number */ |
a86854d0 KC |
436 | imx6_soc_volt = devm_kcalloc(cpu_dev, num, sizeof(*imx6_soc_volt), |
437 | GFP_KERNEL); | |
b4573d1d AH |
438 | if (imx6_soc_volt == NULL) { |
439 | ret = -ENOMEM; | |
440 | goto free_freq_table; | |
441 | } | |
442 | ||
443 | prop = of_find_property(np, "fsl,soc-operating-points", NULL); | |
444 | if (!prop || !prop->value) | |
445 | goto soc_opp_out; | |
446 | ||
447 | /* | |
448 | * Each OPP is a set of tuples consisting of frequency and | |
449 | * voltage like <freq-kHz vol-uV>. | |
450 | */ | |
451 | nr = prop->length / sizeof(u32); | |
452 | if (nr % 2 || (nr / 2) < num) | |
453 | goto soc_opp_out; | |
454 | ||
455 | for (j = 0; j < num; j++) { | |
456 | val = prop->value; | |
457 | for (i = 0; i < nr / 2; i++) { | |
458 | unsigned long freq = be32_to_cpup(val++); | |
459 | unsigned long volt = be32_to_cpup(val++); | |
460 | if (freq_table[j].frequency == freq) { | |
461 | imx6_soc_volt[soc_opp_count++] = volt; | |
462 | break; | |
463 | } | |
464 | } | |
465 | } | |
466 | ||
467 | soc_opp_out: | |
468 | /* use fixed soc opp volt if no valid soc opp info found in dtb */ | |
469 | if (soc_opp_count != num) { | |
470 | dev_warn(cpu_dev, "can NOT find valid fsl,soc-operating-points property in dtb, use default value!\n"); | |
471 | for (j = 0; j < num; j++) | |
472 | imx6_soc_volt[j] = PU_SOC_VOLTAGE_NORMAL; | |
473 | if (freq_table[num - 1].frequency * 1000 == FREQ_1P2_GHZ) | |
474 | imx6_soc_volt[num - 1] = PU_SOC_VOLTAGE_HIGH; | |
475 | } | |
476 | ||
1dd538f0 SG |
477 | if (of_property_read_u32(np, "clock-latency", &transition_latency)) |
478 | transition_latency = CPUFREQ_ETERNAL; | |
479 | ||
b4573d1d AH |
480 | /* |
481 | * Calculate the ramp time for max voltage change in the | |
482 | * VDDSOC and VDDPU regulators. | |
483 | */ | |
484 | ret = regulator_set_voltage_time(soc_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]); | |
485 | if (ret > 0) | |
486 | transition_latency += ret * 1000; | |
22d0628a AH |
487 | if (!IS_ERR(pu_reg)) { |
488 | ret = regulator_set_voltage_time(pu_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]); | |
489 | if (ret > 0) | |
490 | transition_latency += ret * 1000; | |
491 | } | |
b4573d1d | 492 | |
1dd538f0 SG |
493 | /* |
494 | * OPP is maintained in order of increasing frequency, and | |
495 | * freq_table initialised from OPP is therefore sorted in the | |
496 | * same order. | |
497 | */ | |
8d768cdc | 498 | max_freq = freq_table[--num].frequency; |
5d4879cd | 499 | opp = dev_pm_opp_find_freq_exact(cpu_dev, |
1dd538f0 | 500 | freq_table[0].frequency * 1000, true); |
5d4879cd | 501 | min_volt = dev_pm_opp_get_voltage(opp); |
8a31d9d9 | 502 | dev_pm_opp_put(opp); |
8d768cdc | 503 | opp = dev_pm_opp_find_freq_exact(cpu_dev, max_freq * 1000, true); |
5d4879cd | 504 | max_volt = dev_pm_opp_get_voltage(opp); |
8a31d9d9 VK |
505 | dev_pm_opp_put(opp); |
506 | ||
1dd538f0 SG |
507 | ret = regulator_set_voltage_time(arm_reg, min_volt, max_volt); |
508 | if (ret > 0) | |
509 | transition_latency += ret * 1000; | |
510 | ||
1dd538f0 SG |
511 | ret = cpufreq_register_driver(&imx6q_cpufreq_driver); |
512 | if (ret) { | |
513 | dev_err(cpu_dev, "failed register driver: %d\n", ret); | |
514 | goto free_freq_table; | |
515 | } | |
516 | ||
517 | of_node_put(np); | |
518 | return 0; | |
519 | ||
520 | free_freq_table: | |
5d4879cd | 521 | dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); |
cc87b8a8 VK |
522 | out_free_opp: |
523 | if (free_opp) | |
8f8d37b2 | 524 | dev_pm_opp_of_remove_table(cpu_dev); |
f8269c19 PZ |
525 | put_reg: |
526 | if (!IS_ERR(arm_reg)) | |
527 | regulator_put(arm_reg); | |
528 | if (!IS_ERR(pu_reg)) | |
529 | regulator_put(pu_reg); | |
530 | if (!IS_ERR(soc_reg)) | |
531 | regulator_put(soc_reg); | |
2332bd04 DA |
532 | |
533 | clk_bulk_put(num_clks, clks); | |
534 | put_node: | |
1dd538f0 | 535 | of_node_put(np); |
2332bd04 | 536 | |
1dd538f0 SG |
537 | return ret; |
538 | } | |
539 | ||
540 | static int imx6q_cpufreq_remove(struct platform_device *pdev) | |
541 | { | |
542 | cpufreq_unregister_driver(&imx6q_cpufreq_driver); | |
5d4879cd | 543 | dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); |
cc87b8a8 | 544 | if (free_opp) |
8f8d37b2 | 545 | dev_pm_opp_of_remove_table(cpu_dev); |
f8269c19 | 546 | regulator_put(arm_reg); |
22d0628a AH |
547 | if (!IS_ERR(pu_reg)) |
548 | regulator_put(pu_reg); | |
f8269c19 | 549 | regulator_put(soc_reg); |
2332bd04 DA |
550 | |
551 | clk_bulk_put(num_clks, clks); | |
1dd538f0 SG |
552 | |
553 | return 0; | |
554 | } | |
555 | ||
556 | static struct platform_driver imx6q_cpufreq_platdrv = { | |
557 | .driver = { | |
558 | .name = "imx6q-cpufreq", | |
1dd538f0 SG |
559 | }, |
560 | .probe = imx6q_cpufreq_probe, | |
561 | .remove = imx6q_cpufreq_remove, | |
562 | }; | |
563 | module_platform_driver(imx6q_cpufreq_platdrv); | |
564 | ||
d0404738 | 565 | MODULE_ALIAS("platform:imx6q-cpufreq"); |
1dd538f0 SG |
566 | MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); |
567 | MODULE_DESCRIPTION("Freescale i.MX6Q cpufreq driver"); | |
568 | MODULE_LICENSE("GPL"); |