2 * Copyright 2011-2013 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
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:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/clk.h>
14 #include <linux/delay.h>
16 #include <linux/irq.h>
17 #include <linux/irqchip.h>
19 #include <linux/of_address.h>
20 #include <linux/of_irq.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm_domain.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/irqchip/arm-gic.h>
28 #define GPC_CNTR 0x000
29 #define GPC_IMR1 0x008
30 #define GPC_PGC_GPU_PDN 0x260
31 #define GPC_PGC_GPU_PUPSCR 0x264
32 #define GPC_PGC_GPU_PDNSCR 0x268
33 #define GPC_PGC_CPU_PDN 0x2a0
34 #define GPC_PGC_CPU_PUPSCR 0x2a4
35 #define GPC_PGC_CPU_PDNSCR 0x2a8
36 #define GPC_PGC_SW2ISO_SHIFT 0x8
37 #define GPC_PGC_SW_SHIFT 0x0
40 #define GPC_MAX_IRQS (IMR_NUM * 32)
42 #define GPU_VPU_PUP_REQ BIT(1)
43 #define GPU_VPU_PDN_REQ BIT(0)
48 struct generic_pm_domain base
;
49 struct regulator
*reg
;
50 struct clk
*clk
[GPC_CLK_MAX
];
54 static void __iomem
*gpc_base
;
55 static u32 gpc_wake_irqs
[IMR_NUM
];
56 static u32 gpc_saved_imrs
[IMR_NUM
];
58 void imx_gpc_set_arm_power_up_timing(u32 sw2iso
, u32 sw
)
60 writel_relaxed((sw2iso
<< GPC_PGC_SW2ISO_SHIFT
) |
61 (sw
<< GPC_PGC_SW_SHIFT
), gpc_base
+ GPC_PGC_CPU_PUPSCR
);
64 void imx_gpc_set_arm_power_down_timing(u32 sw2iso
, u32 sw
)
66 writel_relaxed((sw2iso
<< GPC_PGC_SW2ISO_SHIFT
) |
67 (sw
<< GPC_PGC_SW_SHIFT
), gpc_base
+ GPC_PGC_CPU_PDNSCR
);
70 void imx_gpc_set_arm_power_in_lpm(bool power_off
)
72 writel_relaxed(power_off
, gpc_base
+ GPC_PGC_CPU_PDN
);
75 void imx_gpc_pre_suspend(bool arm_power_off
)
77 void __iomem
*reg_imr1
= gpc_base
+ GPC_IMR1
;
80 /* Tell GPC to power off ARM core when suspend */
82 imx_gpc_set_arm_power_in_lpm(arm_power_off
);
84 for (i
= 0; i
< IMR_NUM
; i
++) {
85 gpc_saved_imrs
[i
] = readl_relaxed(reg_imr1
+ i
* 4);
86 writel_relaxed(~gpc_wake_irqs
[i
], reg_imr1
+ i
* 4);
90 void imx_gpc_post_resume(void)
92 void __iomem
*reg_imr1
= gpc_base
+ GPC_IMR1
;
95 /* Keep ARM core powered on for other low-power modes */
96 imx_gpc_set_arm_power_in_lpm(false);
98 for (i
= 0; i
< IMR_NUM
; i
++)
99 writel_relaxed(gpc_saved_imrs
[i
], reg_imr1
+ i
* 4);
102 static int imx_gpc_irq_set_wake(struct irq_data
*d
, unsigned int on
)
104 unsigned int idx
= d
->hwirq
/ 32;
107 mask
= 1 << d
->hwirq
% 32;
108 gpc_wake_irqs
[idx
] = on
? gpc_wake_irqs
[idx
] | mask
:
109 gpc_wake_irqs
[idx
] & ~mask
;
112 * Do *not* call into the parent, as the GIC doesn't have any
113 * wake-up facility...
118 void imx_gpc_mask_all(void)
120 void __iomem
*reg_imr1
= gpc_base
+ GPC_IMR1
;
123 for (i
= 0; i
< IMR_NUM
; i
++) {
124 gpc_saved_imrs
[i
] = readl_relaxed(reg_imr1
+ i
* 4);
125 writel_relaxed(~0, reg_imr1
+ i
* 4);
130 void imx_gpc_restore_all(void)
132 void __iomem
*reg_imr1
= gpc_base
+ GPC_IMR1
;
135 for (i
= 0; i
< IMR_NUM
; i
++)
136 writel_relaxed(gpc_saved_imrs
[i
], reg_imr1
+ i
* 4);
139 void imx_gpc_hwirq_unmask(unsigned int hwirq
)
144 reg
= gpc_base
+ GPC_IMR1
+ hwirq
/ 32 * 4;
145 val
= readl_relaxed(reg
);
146 val
&= ~(1 << hwirq
% 32);
147 writel_relaxed(val
, reg
);
150 void imx_gpc_hwirq_mask(unsigned int hwirq
)
155 reg
= gpc_base
+ GPC_IMR1
+ hwirq
/ 32 * 4;
156 val
= readl_relaxed(reg
);
157 val
|= 1 << (hwirq
% 32);
158 writel_relaxed(val
, reg
);
161 static void imx_gpc_irq_unmask(struct irq_data
*d
)
163 imx_gpc_hwirq_unmask(d
->hwirq
);
164 irq_chip_unmask_parent(d
);
167 static void imx_gpc_irq_mask(struct irq_data
*d
)
169 imx_gpc_hwirq_mask(d
->hwirq
);
170 irq_chip_mask_parent(d
);
173 static struct irq_chip imx_gpc_chip
= {
175 .irq_eoi
= irq_chip_eoi_parent
,
176 .irq_mask
= imx_gpc_irq_mask
,
177 .irq_unmask
= imx_gpc_irq_unmask
,
178 .irq_retrigger
= irq_chip_retrigger_hierarchy
,
179 .irq_set_wake
= imx_gpc_irq_set_wake
,
181 .irq_set_affinity
= irq_chip_set_affinity_parent
,
185 static int imx_gpc_domain_translate(struct irq_domain
*d
,
186 struct irq_fwspec
*fwspec
,
187 unsigned long *hwirq
,
190 if (is_of_node(fwspec
->fwnode
)) {
191 if (fwspec
->param_count
!= 3)
194 /* No PPI should point to this domain */
195 if (fwspec
->param
[0] != 0)
198 *hwirq
= fwspec
->param
[1];
199 *type
= fwspec
->param
[2];
206 static int imx_gpc_domain_alloc(struct irq_domain
*domain
,
208 unsigned int nr_irqs
, void *data
)
210 struct irq_fwspec
*fwspec
= data
;
211 struct irq_fwspec parent_fwspec
;
212 irq_hw_number_t hwirq
;
215 if (fwspec
->param_count
!= 3)
216 return -EINVAL
; /* Not GIC compliant */
217 if (fwspec
->param
[0] != 0)
218 return -EINVAL
; /* No PPI should point to this domain */
220 hwirq
= fwspec
->param
[1];
221 if (hwirq
>= GPC_MAX_IRQS
)
222 return -EINVAL
; /* Can't deal with this */
224 for (i
= 0; i
< nr_irqs
; i
++)
225 irq_domain_set_hwirq_and_chip(domain
, irq
+ i
, hwirq
+ i
,
226 &imx_gpc_chip
, NULL
);
228 parent_fwspec
= *fwspec
;
229 parent_fwspec
.fwnode
= domain
->parent
->fwnode
;
230 return irq_domain_alloc_irqs_parent(domain
, irq
, nr_irqs
,
234 static const struct irq_domain_ops imx_gpc_domain_ops
= {
235 .translate
= imx_gpc_domain_translate
,
236 .alloc
= imx_gpc_domain_alloc
,
237 .free
= irq_domain_free_irqs_common
,
240 static int __init
imx_gpc_init(struct device_node
*node
,
241 struct device_node
*parent
)
243 struct irq_domain
*parent_domain
, *domain
;
247 pr_err("%s: no parent, giving up\n", node
->full_name
);
251 parent_domain
= irq_find_host(parent
);
252 if (!parent_domain
) {
253 pr_err("%s: unable to obtain parent domain\n", node
->full_name
);
257 gpc_base
= of_iomap(node
, 0);
258 if (WARN_ON(!gpc_base
))
261 domain
= irq_domain_add_hierarchy(parent_domain
, 0, GPC_MAX_IRQS
,
262 node
, &imx_gpc_domain_ops
,
269 /* Initially mask all interrupts */
270 for (i
= 0; i
< IMR_NUM
; i
++)
271 writel_relaxed(~0, gpc_base
+ GPC_IMR1
+ i
* 4);
275 IRQCHIP_DECLARE(imx_gpc
, "fsl,imx6q-gpc", imx_gpc_init
);
277 void __init
imx_gpc_check_dt(void)
279 struct device_node
*np
;
281 np
= of_find_compatible_node(NULL
, NULL
, "fsl,imx6q-gpc");
285 if (WARN_ON(!of_find_property(np
, "interrupt-controller", NULL
))) {
286 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
288 /* map GPC, so that at least CPUidle and WARs keep working */
289 gpc_base
= of_iomap(np
, 0);
293 static void _imx6q_pm_pu_power_off(struct generic_pm_domain
*genpd
)
298 /* Read ISO and ISO2SW power down delays */
299 val
= readl_relaxed(gpc_base
+ GPC_PGC_GPU_PDNSCR
);
301 iso2sw
= (val
>> 8) & 0x3f;
303 /* Gate off PU domain when GPU/VPU when powered down */
304 writel_relaxed(0x1, gpc_base
+ GPC_PGC_GPU_PDN
);
306 /* Request GPC to power down GPU/VPU */
307 val
= readl_relaxed(gpc_base
+ GPC_CNTR
);
308 val
|= GPU_VPU_PDN_REQ
;
309 writel_relaxed(val
, gpc_base
+ GPC_CNTR
);
311 /* Wait ISO + ISO2SW IPG clock cycles */
312 ndelay((iso
+ iso2sw
) * 1000 / 66);
315 static int imx6q_pm_pu_power_off(struct generic_pm_domain
*genpd
)
317 struct pu_domain
*pu
= container_of(genpd
, struct pu_domain
, base
);
319 _imx6q_pm_pu_power_off(genpd
);
322 regulator_disable(pu
->reg
);
327 static int imx6q_pm_pu_power_on(struct generic_pm_domain
*genpd
)
329 struct pu_domain
*pu
= container_of(genpd
, struct pu_domain
, base
);
330 int i
, ret
, sw
, sw2iso
;
334 ret
= regulator_enable(pu
->reg
);
335 if (pu
->reg
&& ret
) {
336 pr_err("%s: failed to enable regulator: %d\n", __func__
, ret
);
340 /* Enable reset clocks for all devices in the PU domain */
341 for (i
= 0; i
< pu
->num_clks
; i
++)
342 clk_prepare_enable(pu
->clk
[i
]);
344 /* Gate off PU domain when GPU/VPU when powered down */
345 writel_relaxed(0x1, gpc_base
+ GPC_PGC_GPU_PDN
);
347 /* Read ISO and ISO2SW power down delays */
348 val
= readl_relaxed(gpc_base
+ GPC_PGC_GPU_PUPSCR
);
350 sw2iso
= (val
>> 8) & 0x3f;
352 /* Request GPC to power up GPU/VPU */
353 val
= readl_relaxed(gpc_base
+ GPC_CNTR
);
354 val
|= GPU_VPU_PUP_REQ
;
355 writel_relaxed(val
, gpc_base
+ GPC_CNTR
);
357 /* Wait ISO + ISO2SW IPG clock cycles */
358 ndelay((sw
+ sw2iso
) * 1000 / 66);
360 /* Disable reset clocks for all devices in the PU domain */
361 for (i
= 0; i
< pu
->num_clks
; i
++)
362 clk_disable_unprepare(pu
->clk
[i
]);
367 static struct generic_pm_domain imx6q_arm_domain
= {
371 static struct pu_domain imx6q_pu_domain
= {
374 .power_off
= imx6q_pm_pu_power_off
,
375 .power_on
= imx6q_pm_pu_power_on
,
376 .power_off_latency_ns
= 25000,
377 .power_on_latency_ns
= 2000000,
381 static struct generic_pm_domain imx6sl_display_domain
= {
385 static struct generic_pm_domain
*imx_gpc_domains
[] = {
387 &imx6q_pu_domain
.base
,
388 &imx6sl_display_domain
,
391 static struct genpd_onecell_data imx_gpc_onecell_data
= {
392 .domains
= imx_gpc_domains
,
393 .num_domains
= ARRAY_SIZE(imx_gpc_domains
),
396 static int imx_gpc_genpd_init(struct device
*dev
, struct regulator
*pu_reg
)
401 imx6q_pu_domain
.reg
= pu_reg
;
404 clk
= of_clk_get(dev
->of_node
, i
);
407 if (i
>= GPC_CLK_MAX
) {
408 dev_err(dev
, "more than %d clocks\n", GPC_CLK_MAX
);
411 imx6q_pu_domain
.clk
[i
] = clk
;
413 imx6q_pu_domain
.num_clks
= i
;
415 /* Enable power always in case bootloader disabled it. */
416 imx6q_pm_pu_power_on(&imx6q_pu_domain
.base
);
418 if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS
))
421 pm_genpd_init(&imx6q_pu_domain
.base
, NULL
, false);
422 return of_genpd_add_provider_onecell(dev
->of_node
,
423 &imx_gpc_onecell_data
);
427 clk_put(imx6q_pu_domain
.clk
[i
]);
431 static int imx_gpc_probe(struct platform_device
*pdev
)
433 struct regulator
*pu_reg
;
436 /* bail out if DT too old and doesn't provide the necessary info */
437 if (!of_property_read_bool(pdev
->dev
.of_node
, "#power-domain-cells"))
440 pu_reg
= devm_regulator_get_optional(&pdev
->dev
, "pu");
441 if (PTR_ERR(pu_reg
) == -ENODEV
)
443 if (IS_ERR(pu_reg
)) {
444 ret
= PTR_ERR(pu_reg
);
445 dev_err(&pdev
->dev
, "failed to get pu regulator: %d\n", ret
);
449 return imx_gpc_genpd_init(&pdev
->dev
, pu_reg
);
452 static const struct of_device_id imx_gpc_dt_ids
[] = {
453 { .compatible
= "fsl,imx6q-gpc" },
454 { .compatible
= "fsl,imx6sl-gpc" },
458 static struct platform_driver imx_gpc_driver
= {
461 .of_match_table
= imx_gpc_dt_ids
,
463 .probe
= imx_gpc_probe
,
466 static int __init
imx_pgc_init(void)
468 return platform_driver_register(&imx_gpc_driver
);
470 subsys_initcall(imx_pgc_init
);