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9fbbe689 | 1 | /* |
263475d4 | 2 | * Copyright 2011-2013 Freescale Semiconductor, Inc. |
9fbbe689 SG |
3 | * Copyright 2011 Linaro Ltd. |
4 | * | |
5 | * The code contained herein is licensed under the GNU General Public | |
6 | * License. You may obtain a copy of the GNU General Public License | |
7 | * Version 2 or later at the following locations: | |
8 | * | |
9 | * http://www.opensource.org/licenses/gpl-license.html | |
10 | * http://www.gnu.org/copyleft/gpl.html | |
11 | */ | |
12 | ||
00eb60a8 PZ |
13 | #include <linux/clk.h> |
14 | #include <linux/delay.h> | |
9fbbe689 SG |
15 | #include <linux/io.h> |
16 | #include <linux/irq.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_address.h> | |
19 | #include <linux/of_irq.h> | |
00eb60a8 PZ |
20 | #include <linux/platform_device.h> |
21 | #include <linux/pm_domain.h> | |
22 | #include <linux/regulator/consumer.h> | |
520f7bd7 | 23 | #include <linux/irqchip/arm-gic.h> |
9a67a6fd | 24 | #include "common.h" |
00eb60a8 | 25 | #include "hardware.h" |
9fbbe689 | 26 | |
00eb60a8 | 27 | #define GPC_CNTR 0x000 |
9fbbe689 | 28 | #define GPC_IMR1 0x008 |
00eb60a8 PZ |
29 | #define GPC_PGC_GPU_PDN 0x260 |
30 | #define GPC_PGC_GPU_PUPSCR 0x264 | |
31 | #define GPC_PGC_GPU_PDNSCR 0x268 | |
9fbbe689 | 32 | #define GPC_PGC_CPU_PDN 0x2a0 |
05136f08 AH |
33 | #define GPC_PGC_CPU_PUPSCR 0x2a4 |
34 | #define GPC_PGC_CPU_PDNSCR 0x2a8 | |
35 | #define GPC_PGC_SW2ISO_SHIFT 0x8 | |
36 | #define GPC_PGC_SW_SHIFT 0x0 | |
9fbbe689 SG |
37 | |
38 | #define IMR_NUM 4 | |
b923ff6a | 39 | #define GPC_MAX_IRQS (IMR_NUM * 32) |
9fbbe689 | 40 | |
00eb60a8 PZ |
41 | #define GPU_VPU_PUP_REQ BIT(1) |
42 | #define GPU_VPU_PDN_REQ BIT(0) | |
43 | ||
44 | #define GPC_CLK_MAX 6 | |
45 | ||
46 | struct pu_domain { | |
47 | struct generic_pm_domain base; | |
48 | struct regulator *reg; | |
49 | struct clk *clk[GPC_CLK_MAX]; | |
50 | int num_clks; | |
51 | }; | |
52 | ||
9fbbe689 SG |
53 | static void __iomem *gpc_base; |
54 | static u32 gpc_wake_irqs[IMR_NUM]; | |
55 | static u32 gpc_saved_imrs[IMR_NUM]; | |
56 | ||
05136f08 AH |
57 | void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw) |
58 | { | |
59 | writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) | | |
60 | (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR); | |
61 | } | |
62 | ||
63 | void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw) | |
64 | { | |
65 | writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) | | |
66 | (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR); | |
67 | } | |
68 | ||
69 | void imx_gpc_set_arm_power_in_lpm(bool power_off) | |
70 | { | |
71 | writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN); | |
72 | } | |
73 | ||
80c0ecdc | 74 | void imx_gpc_pre_suspend(bool arm_power_off) |
9fbbe689 SG |
75 | { |
76 | void __iomem *reg_imr1 = gpc_base + GPC_IMR1; | |
77 | int i; | |
78 | ||
79 | /* Tell GPC to power off ARM core when suspend */ | |
80c0ecdc | 80 | if (arm_power_off) |
05136f08 | 81 | imx_gpc_set_arm_power_in_lpm(arm_power_off); |
9fbbe689 SG |
82 | |
83 | for (i = 0; i < IMR_NUM; i++) { | |
84 | gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4); | |
85 | writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4); | |
86 | } | |
87 | } | |
88 | ||
89 | void imx_gpc_post_resume(void) | |
90 | { | |
91 | void __iomem *reg_imr1 = gpc_base + GPC_IMR1; | |
92 | int i; | |
93 | ||
94 | /* Keep ARM core powered on for other low-power modes */ | |
05136f08 | 95 | imx_gpc_set_arm_power_in_lpm(false); |
9fbbe689 SG |
96 | |
97 | for (i = 0; i < IMR_NUM; i++) | |
98 | writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4); | |
99 | } | |
100 | ||
101 | static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on) | |
102 | { | |
b923ff6a | 103 | unsigned int idx = d->hwirq / 32; |
9fbbe689 SG |
104 | u32 mask; |
105 | ||
e2fd06f6 | 106 | mask = 1 << d->hwirq % 32; |
9fbbe689 SG |
107 | gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask : |
108 | gpc_wake_irqs[idx] & ~mask; | |
109 | ||
b923ff6a MZ |
110 | /* |
111 | * Do *not* call into the parent, as the GIC doesn't have any | |
112 | * wake-up facility... | |
113 | */ | |
9fbbe689 SG |
114 | return 0; |
115 | } | |
116 | ||
263475d4 AH |
117 | void imx_gpc_mask_all(void) |
118 | { | |
119 | void __iomem *reg_imr1 = gpc_base + GPC_IMR1; | |
120 | int i; | |
121 | ||
122 | for (i = 0; i < IMR_NUM; i++) { | |
123 | gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4); | |
124 | writel_relaxed(~0, reg_imr1 + i * 4); | |
125 | } | |
126 | ||
127 | } | |
128 | ||
129 | void imx_gpc_restore_all(void) | |
130 | { | |
131 | void __iomem *reg_imr1 = gpc_base + GPC_IMR1; | |
132 | int i; | |
133 | ||
134 | for (i = 0; i < IMR_NUM; i++) | |
135 | writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4); | |
136 | } | |
137 | ||
65bb688a | 138 | void imx_gpc_hwirq_unmask(unsigned int hwirq) |
9fbbe689 SG |
139 | { |
140 | void __iomem *reg; | |
141 | u32 val; | |
142 | ||
b923ff6a | 143 | reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4; |
9fbbe689 | 144 | val = readl_relaxed(reg); |
65bb688a | 145 | val &= ~(1 << hwirq % 32); |
9fbbe689 SG |
146 | writel_relaxed(val, reg); |
147 | } | |
148 | ||
65bb688a | 149 | void imx_gpc_hwirq_mask(unsigned int hwirq) |
9fbbe689 SG |
150 | { |
151 | void __iomem *reg; | |
152 | u32 val; | |
153 | ||
b923ff6a | 154 | reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4; |
65bb688a MZ |
155 | val = readl_relaxed(reg); |
156 | val |= 1 << (hwirq % 32); | |
157 | writel_relaxed(val, reg); | |
158 | } | |
159 | ||
160 | static void imx_gpc_irq_unmask(struct irq_data *d) | |
161 | { | |
65bb688a | 162 | imx_gpc_hwirq_unmask(d->hwirq); |
b923ff6a | 163 | irq_chip_unmask_parent(d); |
65bb688a MZ |
164 | } |
165 | ||
166 | static void imx_gpc_irq_mask(struct irq_data *d) | |
167 | { | |
65bb688a | 168 | imx_gpc_hwirq_mask(d->hwirq); |
b923ff6a | 169 | irq_chip_mask_parent(d); |
9fbbe689 SG |
170 | } |
171 | ||
b923ff6a | 172 | static struct irq_chip imx_gpc_chip = { |
e33b6752 MZ |
173 | .name = "GPC", |
174 | .irq_eoi = irq_chip_eoi_parent, | |
175 | .irq_mask = imx_gpc_irq_mask, | |
176 | .irq_unmask = imx_gpc_irq_unmask, | |
177 | .irq_retrigger = irq_chip_retrigger_hierarchy, | |
178 | .irq_set_wake = imx_gpc_irq_set_wake, | |
179 | #ifdef CONFIG_SMP | |
180 | .irq_set_affinity = irq_chip_set_affinity_parent, | |
181 | #endif | |
b923ff6a MZ |
182 | }; |
183 | ||
184 | static int imx_gpc_domain_xlate(struct irq_domain *domain, | |
185 | struct device_node *controller, | |
186 | const u32 *intspec, | |
187 | unsigned int intsize, | |
188 | unsigned long *out_hwirq, | |
189 | unsigned int *out_type) | |
9fbbe689 | 190 | { |
b923ff6a MZ |
191 | if (domain->of_node != controller) |
192 | return -EINVAL; /* Shouldn't happen, really... */ | |
193 | if (intsize != 3) | |
194 | return -EINVAL; /* Not GIC compliant */ | |
195 | if (intspec[0] != 0) | |
196 | return -EINVAL; /* No PPI should point to this domain */ | |
197 | ||
198 | *out_hwirq = intspec[1]; | |
199 | *out_type = intspec[2]; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int imx_gpc_domain_alloc(struct irq_domain *domain, | |
204 | unsigned int irq, | |
205 | unsigned int nr_irqs, void *data) | |
206 | { | |
207 | struct of_phandle_args *args = data; | |
208 | struct of_phandle_args parent_args; | |
209 | irq_hw_number_t hwirq; | |
485863b8 | 210 | int i; |
9fbbe689 | 211 | |
b923ff6a MZ |
212 | if (args->args_count != 3) |
213 | return -EINVAL; /* Not GIC compliant */ | |
214 | if (args->args[0] != 0) | |
215 | return -EINVAL; /* No PPI should point to this domain */ | |
216 | ||
217 | hwirq = args->args[1]; | |
218 | if (hwirq >= GPC_MAX_IRQS) | |
219 | return -EINVAL; /* Can't deal with this */ | |
220 | ||
221 | for (i = 0; i < nr_irqs; i++) | |
222 | irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i, | |
223 | &imx_gpc_chip, NULL); | |
224 | ||
225 | parent_args = *args; | |
226 | parent_args.np = domain->parent->of_node; | |
227 | return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args); | |
228 | } | |
229 | ||
230 | static struct irq_domain_ops imx_gpc_domain_ops = { | |
231 | .xlate = imx_gpc_domain_xlate, | |
232 | .alloc = imx_gpc_domain_alloc, | |
233 | .free = irq_domain_free_irqs_common, | |
234 | }; | |
235 | ||
236 | static int __init imx_gpc_init(struct device_node *node, | |
237 | struct device_node *parent) | |
238 | { | |
239 | struct irq_domain *parent_domain, *domain; | |
240 | int i; | |
241 | ||
242 | if (!parent) { | |
243 | pr_err("%s: no parent, giving up\n", node->full_name); | |
244 | return -ENODEV; | |
245 | } | |
246 | ||
247 | parent_domain = irq_find_host(parent); | |
248 | if (!parent_domain) { | |
249 | pr_err("%s: unable to obtain parent domain\n", node->full_name); | |
250 | return -ENXIO; | |
251 | } | |
252 | ||
253 | gpc_base = of_iomap(node, 0); | |
254 | if (WARN_ON(!gpc_base)) | |
255 | return -ENOMEM; | |
256 | ||
257 | domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS, | |
258 | node, &imx_gpc_domain_ops, | |
259 | NULL); | |
260 | if (!domain) { | |
261 | iounmap(gpc_base); | |
262 | return -ENOMEM; | |
263 | } | |
9fbbe689 | 264 | |
485863b8 SG |
265 | /* Initially mask all interrupts */ |
266 | for (i = 0; i < IMR_NUM; i++) | |
267 | writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4); | |
268 | ||
b923ff6a | 269 | return 0; |
9fbbe689 | 270 | } |
00eb60a8 | 271 | |
b923ff6a MZ |
272 | /* |
273 | * We cannot use the IRQCHIP_DECLARE macro that lives in | |
274 | * drivers/irqchip, so we're forced to roll our own. Not very nice. | |
275 | */ | |
276 | OF_DECLARE_2(irqchip, imx_gpc, "fsl,imx6q-gpc", imx_gpc_init); | |
277 | ||
00eb60a8 PZ |
278 | #ifdef CONFIG_PM_GENERIC_DOMAINS |
279 | ||
280 | static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd) | |
281 | { | |
282 | int iso, iso2sw; | |
283 | u32 val; | |
284 | ||
285 | /* Read ISO and ISO2SW power down delays */ | |
286 | val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR); | |
287 | iso = val & 0x3f; | |
288 | iso2sw = (val >> 8) & 0x3f; | |
289 | ||
290 | /* Gate off PU domain when GPU/VPU when powered down */ | |
291 | writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN); | |
292 | ||
293 | /* Request GPC to power down GPU/VPU */ | |
294 | val = readl_relaxed(gpc_base + GPC_CNTR); | |
295 | val |= GPU_VPU_PDN_REQ; | |
296 | writel_relaxed(val, gpc_base + GPC_CNTR); | |
297 | ||
298 | /* Wait ISO + ISO2SW IPG clock cycles */ | |
299 | ndelay((iso + iso2sw) * 1000 / 66); | |
300 | } | |
301 | ||
302 | static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd) | |
303 | { | |
304 | struct pu_domain *pu = container_of(genpd, struct pu_domain, base); | |
305 | ||
306 | _imx6q_pm_pu_power_off(genpd); | |
307 | ||
308 | if (pu->reg) | |
309 | regulator_disable(pu->reg); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd) | |
315 | { | |
316 | struct pu_domain *pu = container_of(genpd, struct pu_domain, base); | |
317 | int i, ret, sw, sw2iso; | |
318 | u32 val; | |
319 | ||
320 | if (pu->reg) | |
321 | ret = regulator_enable(pu->reg); | |
322 | if (pu->reg && ret) { | |
323 | pr_err("%s: failed to enable regulator: %d\n", __func__, ret); | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* Enable reset clocks for all devices in the PU domain */ | |
328 | for (i = 0; i < pu->num_clks; i++) | |
329 | clk_prepare_enable(pu->clk[i]); | |
330 | ||
331 | /* Gate off PU domain when GPU/VPU when powered down */ | |
332 | writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN); | |
333 | ||
334 | /* Read ISO and ISO2SW power down delays */ | |
335 | val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR); | |
336 | sw = val & 0x3f; | |
337 | sw2iso = (val >> 8) & 0x3f; | |
338 | ||
339 | /* Request GPC to power up GPU/VPU */ | |
340 | val = readl_relaxed(gpc_base + GPC_CNTR); | |
341 | val |= GPU_VPU_PUP_REQ; | |
342 | writel_relaxed(val, gpc_base + GPC_CNTR); | |
343 | ||
344 | /* Wait ISO + ISO2SW IPG clock cycles */ | |
345 | ndelay((sw + sw2iso) * 1000 / 66); | |
346 | ||
347 | /* Disable reset clocks for all devices in the PU domain */ | |
348 | for (i = 0; i < pu->num_clks; i++) | |
349 | clk_disable_unprepare(pu->clk[i]); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | static struct generic_pm_domain imx6q_arm_domain = { | |
355 | .name = "ARM", | |
356 | }; | |
357 | ||
358 | static struct pu_domain imx6q_pu_domain = { | |
359 | .base = { | |
360 | .name = "PU", | |
361 | .power_off = imx6q_pm_pu_power_off, | |
362 | .power_on = imx6q_pm_pu_power_on, | |
363 | .power_off_latency_ns = 25000, | |
364 | .power_on_latency_ns = 2000000, | |
365 | }, | |
366 | }; | |
367 | ||
368 | static struct generic_pm_domain imx6sl_display_domain = { | |
369 | .name = "DISPLAY", | |
370 | }; | |
371 | ||
372 | static struct generic_pm_domain *imx_gpc_domains[] = { | |
373 | &imx6q_arm_domain, | |
374 | &imx6q_pu_domain.base, | |
375 | &imx6sl_display_domain, | |
376 | }; | |
377 | ||
378 | static struct genpd_onecell_data imx_gpc_onecell_data = { | |
379 | .domains = imx_gpc_domains, | |
380 | .num_domains = ARRAY_SIZE(imx_gpc_domains), | |
381 | }; | |
382 | ||
383 | static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg) | |
384 | { | |
385 | struct clk *clk; | |
386 | bool is_off; | |
387 | int i; | |
388 | ||
389 | imx6q_pu_domain.reg = pu_reg; | |
390 | ||
391 | for (i = 0; ; i++) { | |
392 | clk = of_clk_get(dev->of_node, i); | |
393 | if (IS_ERR(clk)) | |
394 | break; | |
395 | if (i >= GPC_CLK_MAX) { | |
396 | dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX); | |
397 | goto clk_err; | |
398 | } | |
399 | imx6q_pu_domain.clk[i] = clk; | |
400 | } | |
401 | imx6q_pu_domain.num_clks = i; | |
402 | ||
403 | is_off = IS_ENABLED(CONFIG_PM); | |
404 | if (is_off) { | |
405 | _imx6q_pm_pu_power_off(&imx6q_pu_domain.base); | |
406 | } else { | |
407 | /* | |
408 | * Enable power if compiled without CONFIG_PM in case the | |
409 | * bootloader disabled it. | |
410 | */ | |
411 | imx6q_pm_pu_power_on(&imx6q_pu_domain.base); | |
412 | } | |
413 | ||
414 | pm_genpd_init(&imx6q_pu_domain.base, NULL, is_off); | |
415 | return of_genpd_add_provider_onecell(dev->of_node, | |
416 | &imx_gpc_onecell_data); | |
417 | ||
418 | clk_err: | |
419 | while (i--) | |
420 | clk_put(imx6q_pu_domain.clk[i]); | |
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | #else | |
425 | static inline int imx_gpc_genpd_init(struct device *dev, struct regulator *reg) | |
426 | { | |
427 | return 0; | |
428 | } | |
429 | #endif /* CONFIG_PM_GENERIC_DOMAINS */ | |
430 | ||
431 | static int imx_gpc_probe(struct platform_device *pdev) | |
432 | { | |
433 | struct regulator *pu_reg; | |
434 | int ret; | |
435 | ||
436 | pu_reg = devm_regulator_get_optional(&pdev->dev, "pu"); | |
437 | if (PTR_ERR(pu_reg) == -ENODEV) | |
438 | pu_reg = NULL; | |
439 | if (IS_ERR(pu_reg)) { | |
440 | ret = PTR_ERR(pu_reg); | |
441 | dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | return imx_gpc_genpd_init(&pdev->dev, pu_reg); | |
446 | } | |
447 | ||
448 | static const struct of_device_id imx_gpc_dt_ids[] = { | |
449 | { .compatible = "fsl,imx6q-gpc" }, | |
450 | { .compatible = "fsl,imx6sl-gpc" }, | |
451 | { } | |
452 | }; | |
453 | ||
454 | static struct platform_driver imx_gpc_driver = { | |
455 | .driver = { | |
456 | .name = "imx-gpc", | |
457 | .owner = THIS_MODULE, | |
458 | .of_match_table = imx_gpc_dt_ids, | |
459 | }, | |
460 | .probe = imx_gpc_probe, | |
461 | }; | |
462 | ||
463 | static int __init imx_pgc_init(void) | |
464 | { | |
465 | return platform_driver_register(&imx_gpc_driver); | |
466 | } | |
467 | subsys_initcall(imx_pgc_init); |