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1/*
2 * OMAP WakeupGen Source file
3 *
4 * OMAP WakeupGen is the interrupt controller extension used along
5 * with ARM GIC to wake the CPU out from low power states on
6 * external interrupts. It is responsible for generating wakeup
7 * event from the incoming interrupts and enable bits. It is
8 * implemented in MPU always ON power domain. During normal operation,
9 * WakeupGen delivers external interrupts directly to the GIC.
10 *
11 * Copyright (C) 2011 Texas Instruments, Inc.
12 * Santosh Shilimkar <santosh.shilimkar@ti.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/io.h>
22#include <linux/irq.h>
23#include <linux/platform_device.h>
24#include <linux/cpu.h>
25#include <linux/notifier.h>
26#include <linux/cpu_pm.h>
27
28#include <asm/hardware/gic.h>
29
30#include <mach/omap-wakeupgen.h>
31#include <mach/omap-secure.h>
32
33#include "omap4-sar-layout.h"
34#include "common.h"
35
36#define NR_REG_BANKS 4
37#define MAX_IRQS 128
38#define WKG_MASK_ALL 0x00000000
39#define WKG_UNMASK_ALL 0xffffffff
40#define CPU_ENA_OFFSET 0x400
41#define CPU0_ID 0x0
42#define CPU1_ID 0x1
43
44static void __iomem *wakeupgen_base;
45static void __iomem *sar_base;
46static DEFINE_SPINLOCK(wakeupgen_lock);
47static unsigned int irq_target_cpu[NR_IRQS];
48
49/*
50 * Static helper functions.
51 */
52static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
53{
54 return __raw_readl(wakeupgen_base + OMAP_WKG_ENB_A_0 +
55 (cpu * CPU_ENA_OFFSET) + (idx * 4));
56}
57
58static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
59{
60 __raw_writel(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
61 (cpu * CPU_ENA_OFFSET) + (idx * 4));
62}
63
64static inline void sar_writel(u32 val, u32 offset, u8 idx)
65{
66 __raw_writel(val, sar_base + offset + (idx * 4));
67}
68
69static inline int _wakeupgen_get_irq_info(u32 irq, u32 *bit_posn, u8 *reg_index)
70{
71 unsigned int spi_irq;
72
73 /*
74 * PPIs and SGIs are not supported.
75 */
76 if (irq < OMAP44XX_IRQ_GIC_START)
77 return -EINVAL;
78
79 /*
80 * Subtract the GIC offset.
81 */
82 spi_irq = irq - OMAP44XX_IRQ_GIC_START;
83 if (spi_irq > MAX_IRQS) {
84 pr_err("omap wakeupGen: Invalid IRQ%d\n", irq);
85 return -EINVAL;
86 }
87
88 /*
89 * Each WakeupGen register controls 32 interrupt.
90 * i.e. 1 bit per SPI IRQ
91 */
92 *reg_index = spi_irq >> 5;
93 *bit_posn = spi_irq %= 32;
94
95 return 0;
96}
97
98static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
99{
100 u32 val, bit_number;
101 u8 i;
102
103 if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
104 return;
105
106 val = wakeupgen_readl(i, cpu);
107 val &= ~BIT(bit_number);
108 wakeupgen_writel(val, i, cpu);
109}
110
111static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
112{
113 u32 val, bit_number;
114 u8 i;
115
116 if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
117 return;
118
119 val = wakeupgen_readl(i, cpu);
120 val |= BIT(bit_number);
121 wakeupgen_writel(val, i, cpu);
122}
123
124/*
125 * Architecture specific Mask extension
126 */
127static void wakeupgen_mask(struct irq_data *d)
128{
129 unsigned long flags;
130
131 spin_lock_irqsave(&wakeupgen_lock, flags);
132 _wakeupgen_clear(d->irq, irq_target_cpu[d->irq]);
133 spin_unlock_irqrestore(&wakeupgen_lock, flags);
134}
135
136/*
137 * Architecture specific Unmask extension
138 */
139static void wakeupgen_unmask(struct irq_data *d)
140{
141 unsigned long flags;
142
143 spin_lock_irqsave(&wakeupgen_lock, flags);
144 _wakeupgen_set(d->irq, irq_target_cpu[d->irq]);
145 spin_unlock_irqrestore(&wakeupgen_lock, flags);
146}
147
148#ifdef CONFIG_HOTPLUG_CPU
149static DEFINE_PER_CPU(u32 [NR_REG_BANKS], irqmasks);
150
151static void _wakeupgen_save_masks(unsigned int cpu)
152{
153 u8 i;
154
155 for (i = 0; i < NR_REG_BANKS; i++)
156 per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
157}
158
159static void _wakeupgen_restore_masks(unsigned int cpu)
160{
161 u8 i;
162
163 for (i = 0; i < NR_REG_BANKS; i++)
164 wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
165}
166
167static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
168{
169 u8 i;
170
171 for (i = 0; i < NR_REG_BANKS; i++)
172 wakeupgen_writel(reg, i, cpu);
173}
174
175/*
176 * Mask or unmask all interrupts on given CPU.
177 * 0 = Mask all interrupts on the 'cpu'
178 * 1 = Unmask all interrupts on the 'cpu'
179 * Ensure that the initial mask is maintained. This is faster than
180 * iterating through GIC registers to arrive at the correct masks.
181 */
182static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
183{
184 unsigned long flags;
185
186 spin_lock_irqsave(&wakeupgen_lock, flags);
187 if (set) {
188 _wakeupgen_save_masks(cpu);
189 _wakeupgen_set_all(cpu, WKG_MASK_ALL);
190 } else {
191 _wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
192 _wakeupgen_restore_masks(cpu);
193 }
194 spin_unlock_irqrestore(&wakeupgen_lock, flags);
195}
196#endif
197
198#ifdef CONFIG_CPU_PM
199/*
200 * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
201 * ROM code. WakeupGen IP is integrated along with GIC to manage the
202 * interrupt wakeups from CPU low power states. It manages
203 * masking/unmasking of Shared peripheral interrupts(SPI). So the
204 * interrupt enable/disable control should be in sync and consistent
205 * at WakeupGen and GIC so that interrupts are not lost.
206 */
207static void irq_save_context(void)
208{
209 u32 i, val;
210
211 if (omap_rev() == OMAP4430_REV_ES1_0)
212 return;
213
214 if (!sar_base)
215 sar_base = omap4_get_sar_ram_base();
216
217 for (i = 0; i < NR_REG_BANKS; i++) {
218 /* Save the CPUx interrupt mask for IRQ 0 to 127 */
219 val = wakeupgen_readl(i, 0);
220 sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
221 val = wakeupgen_readl(i, 1);
222 sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);
223
224 /*
225 * Disable the secure interrupts for CPUx. The restore
226 * code blindly restores secure and non-secure interrupt
227 * masks from SAR RAM. Secure interrupts are not suppose
228 * to be enabled from HLOS. So overwrite the SAR location
229 * so that the secure interrupt remains disabled.
230 */
231 sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
232 sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
233 }
234
235 /* Save AuxBoot* registers */
236 val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
237 __raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
238 val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
239 __raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);
240
241 /* Save SyncReq generation logic */
242 val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
243 __raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
244 val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
245 __raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);
246
247 /* Save SyncReq generation logic */
248 val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
249 __raw_writel(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
250 val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
251 __raw_writel(val, sar_base + PTMSYNCREQ_EN_OFFSET);
252
253 /* Set the Backup Bit Mask status */
254 val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
255 val |= SAR_BACKUP_STATUS_WAKEUPGEN;
256 __raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
257}
258
259/*
260 * Clear WakeupGen SAR backup status.
261 */
262static void irq_sar_clear(void)
263{
264 u32 val;
265 val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
266 val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
267 __raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
268}
269
270/*
271 * Save GIC and Wakeupgen interrupt context using secure API
272 * for HS/EMU devices.
273 */
274static void irq_save_secure_context(void)
275{
276 u32 ret;
277 ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
278 FLAG_START_CRITICAL,
279 0, 0, 0, 0, 0);
280 if (ret != API_HAL_RET_VALUE_OK)
281 pr_err("GIC and Wakeupgen context save failed\n");
282}
283#endif
284
285#ifdef CONFIG_HOTPLUG_CPU
286static int __cpuinit irq_cpu_hotplug_notify(struct notifier_block *self,
287 unsigned long action, void *hcpu)
288{
289 unsigned int cpu = (unsigned int)hcpu;
290
291 switch (action) {
292 case CPU_ONLINE:
293 wakeupgen_irqmask_all(cpu, 0);
294 break;
295 case CPU_DEAD:
296 wakeupgen_irqmask_all(cpu, 1);
297 break;
298 }
299 return NOTIFY_OK;
300}
301
302static struct notifier_block __refdata irq_hotplug_notifier = {
303 .notifier_call = irq_cpu_hotplug_notify,
304};
305
306static void __init irq_hotplug_init(void)
307{
308 register_hotcpu_notifier(&irq_hotplug_notifier);
309}
310#else
311static void __init irq_hotplug_init(void)
312{}
313#endif
314
315#ifdef CONFIG_CPU_PM
316static int irq_notifier(struct notifier_block *self, unsigned long cmd, void *v)
317{
318 switch (cmd) {
319 case CPU_CLUSTER_PM_ENTER:
320 if (omap_type() == OMAP2_DEVICE_TYPE_GP)
321 irq_save_context();
322 else
323 irq_save_secure_context();
324 break;
325 case CPU_CLUSTER_PM_EXIT:
326 if (omap_type() == OMAP2_DEVICE_TYPE_GP)
327 irq_sar_clear();
328 break;
329 }
330 return NOTIFY_OK;
331}
332
333static struct notifier_block irq_notifier_block = {
334 .notifier_call = irq_notifier,
335};
336
337static void __init irq_pm_init(void)
338{
339 cpu_pm_register_notifier(&irq_notifier_block);
340}
341#else
342static void __init irq_pm_init(void)
343{}
344#endif
345
346/*
347 * Initialise the wakeupgen module.
348 */
349int __init omap_wakeupgen_init(void)
350{
351 int i;
352 unsigned int boot_cpu = smp_processor_id();
353
354 /* Not supported on OMAP4 ES1.0 silicon */
355 if (omap_rev() == OMAP4430_REV_ES1_0) {
356 WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
357 return -EPERM;
358 }
359
360 /* Static mapping, never released */
361 wakeupgen_base = ioremap(OMAP44XX_WKUPGEN_BASE, SZ_4K);
362 if (WARN_ON(!wakeupgen_base))
363 return -ENOMEM;
364
365 /* Clear all IRQ bitmasks at wakeupGen level */
366 for (i = 0; i < NR_REG_BANKS; i++) {
367 wakeupgen_writel(0, i, CPU0_ID);
368 wakeupgen_writel(0, i, CPU1_ID);
369 }
370
371 /*
372 * Override GIC architecture specific functions to add
373 * OMAP WakeupGen interrupt controller along with GIC
374 */
375 gic_arch_extn.irq_mask = wakeupgen_mask;
376 gic_arch_extn.irq_unmask = wakeupgen_unmask;
377 gic_arch_extn.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
378
379 /*
380 * FIXME: Add support to set_smp_affinity() once the core
381 * GIC code has necessary hooks in place.
382 */
383
384 /* Associate all the IRQs to boot CPU like GIC init does. */
385 for (i = 0; i < NR_IRQS; i++)
386 irq_target_cpu[i] = boot_cpu;
387
388 irq_hotplug_init();
389 irq_pm_init();
390
391 return 0;
392}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP WakeupGen Source file
4 *
5 * OMAP WakeupGen is the interrupt controller extension used along
6 * with ARM GIC to wake the CPU out from low power states on
7 * external interrupts. It is responsible for generating wakeup
8 * event from the incoming interrupts and enable bits. It is
9 * implemented in MPU always ON power domain. During normal operation,
10 * WakeupGen delivers external interrupts directly to the GIC.
11 *
12 * Copyright (C) 2011 Texas Instruments, Inc.
13 * Santosh Shilimkar <santosh.shilimkar@ti.com>
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/io.h>
19#include <linux/irq.h>
20#include <linux/irqchip.h>
21#include <linux/irqdomain.h>
22#include <linux/of_address.h>
23#include <linux/platform_device.h>
24#include <linux/cpu.h>
25#include <linux/notifier.h>
26#include <linux/cpu_pm.h>
27
28#include "omap-wakeupgen.h"
29#include "omap-secure.h"
30
31#include "soc.h"
32#include "omap4-sar-layout.h"
33#include "common.h"
34#include "pm.h"
35
36#define AM43XX_NR_REG_BANKS 7
37#define AM43XX_IRQS 224
38#define MAX_NR_REG_BANKS AM43XX_NR_REG_BANKS
39#define MAX_IRQS AM43XX_IRQS
40#define DEFAULT_NR_REG_BANKS 5
41#define DEFAULT_IRQS 160
42#define WKG_MASK_ALL 0x00000000
43#define WKG_UNMASK_ALL 0xffffffff
44#define CPU_ENA_OFFSET 0x400
45#define CPU0_ID 0x0
46#define CPU1_ID 0x1
47#define OMAP4_NR_BANKS 4
48#define OMAP4_NR_IRQS 128
49
50#define SYS_NIRQ1_EXT_SYS_IRQ_1 7
51#define SYS_NIRQ2_EXT_SYS_IRQ_2 119
52
53static void __iomem *wakeupgen_base;
54static void __iomem *sar_base;
55static DEFINE_RAW_SPINLOCK(wakeupgen_lock);
56static unsigned int irq_target_cpu[MAX_IRQS];
57static unsigned int irq_banks = DEFAULT_NR_REG_BANKS;
58static unsigned int max_irqs = DEFAULT_IRQS;
59static unsigned int omap_secure_apis;
60
61#ifdef CONFIG_CPU_PM
62static unsigned int wakeupgen_context[MAX_NR_REG_BANKS];
63#endif
64
65struct omap_wakeupgen_ops {
66 void (*save_context)(void);
67 void (*restore_context)(void);
68};
69
70static struct omap_wakeupgen_ops *wakeupgen_ops;
71
72/*
73 * Static helper functions.
74 */
75static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
76{
77 return readl_relaxed(wakeupgen_base + OMAP_WKG_ENB_A_0 +
78 (cpu * CPU_ENA_OFFSET) + (idx * 4));
79}
80
81static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
82{
83 writel_relaxed(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
84 (cpu * CPU_ENA_OFFSET) + (idx * 4));
85}
86
87static inline void sar_writel(u32 val, u32 offset, u8 idx)
88{
89 writel_relaxed(val, sar_base + offset + (idx * 4));
90}
91
92static inline int _wakeupgen_get_irq_info(u32 irq, u32 *bit_posn, u8 *reg_index)
93{
94 /*
95 * Each WakeupGen register controls 32 interrupt.
96 * i.e. 1 bit per SPI IRQ
97 */
98 *reg_index = irq >> 5;
99 *bit_posn = irq %= 32;
100
101 return 0;
102}
103
104static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
105{
106 u32 val, bit_number;
107 u8 i;
108
109 if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
110 return;
111
112 val = wakeupgen_readl(i, cpu);
113 val &= ~BIT(bit_number);
114 wakeupgen_writel(val, i, cpu);
115}
116
117static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
118{
119 u32 val, bit_number;
120 u8 i;
121
122 if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
123 return;
124
125 val = wakeupgen_readl(i, cpu);
126 val |= BIT(bit_number);
127 wakeupgen_writel(val, i, cpu);
128}
129
130/*
131 * Architecture specific Mask extension
132 */
133static void wakeupgen_mask(struct irq_data *d)
134{
135 unsigned long flags;
136
137 raw_spin_lock_irqsave(&wakeupgen_lock, flags);
138 _wakeupgen_clear(d->hwirq, irq_target_cpu[d->hwirq]);
139 raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
140 irq_chip_mask_parent(d);
141}
142
143/*
144 * Architecture specific Unmask extension
145 */
146static void wakeupgen_unmask(struct irq_data *d)
147{
148 unsigned long flags;
149
150 raw_spin_lock_irqsave(&wakeupgen_lock, flags);
151 _wakeupgen_set(d->hwirq, irq_target_cpu[d->hwirq]);
152 raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
153 irq_chip_unmask_parent(d);
154}
155
156/*
157 * The sys_nirq pins bypass peripheral modules and are wired directly
158 * to MPUSS wakeupgen. They get automatically inverted for GIC.
159 */
160static int wakeupgen_irq_set_type(struct irq_data *d, unsigned int type)
161{
162 bool inverted = false;
163
164 switch (type) {
165 case IRQ_TYPE_LEVEL_LOW:
166 type &= ~IRQ_TYPE_LEVEL_MASK;
167 type |= IRQ_TYPE_LEVEL_HIGH;
168 inverted = true;
169 break;
170 case IRQ_TYPE_EDGE_FALLING:
171 type &= ~IRQ_TYPE_EDGE_BOTH;
172 type |= IRQ_TYPE_EDGE_RISING;
173 inverted = true;
174 break;
175 default:
176 break;
177 }
178
179 if (inverted && d->hwirq != SYS_NIRQ1_EXT_SYS_IRQ_1 &&
180 d->hwirq != SYS_NIRQ2_EXT_SYS_IRQ_2)
181 pr_warn("wakeupgen: irq%li polarity inverted in dts\n",
182 d->hwirq);
183
184 return irq_chip_set_type_parent(d, type);
185}
186
187#ifdef CONFIG_HOTPLUG_CPU
188static DEFINE_PER_CPU(u32 [MAX_NR_REG_BANKS], irqmasks);
189
190static void _wakeupgen_save_masks(unsigned int cpu)
191{
192 u8 i;
193
194 for (i = 0; i < irq_banks; i++)
195 per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
196}
197
198static void _wakeupgen_restore_masks(unsigned int cpu)
199{
200 u8 i;
201
202 for (i = 0; i < irq_banks; i++)
203 wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
204}
205
206static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
207{
208 u8 i;
209
210 for (i = 0; i < irq_banks; i++)
211 wakeupgen_writel(reg, i, cpu);
212}
213
214/*
215 * Mask or unmask all interrupts on given CPU.
216 * 0 = Mask all interrupts on the 'cpu'
217 * 1 = Unmask all interrupts on the 'cpu'
218 * Ensure that the initial mask is maintained. This is faster than
219 * iterating through GIC registers to arrive at the correct masks.
220 */
221static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
222{
223 unsigned long flags;
224
225 raw_spin_lock_irqsave(&wakeupgen_lock, flags);
226 if (set) {
227 _wakeupgen_save_masks(cpu);
228 _wakeupgen_set_all(cpu, WKG_MASK_ALL);
229 } else {
230 _wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
231 _wakeupgen_restore_masks(cpu);
232 }
233 raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
234}
235#endif
236
237#ifdef CONFIG_CPU_PM
238static inline void omap4_irq_save_context(void)
239{
240 u32 i, val;
241
242 if (omap_rev() == OMAP4430_REV_ES1_0)
243 return;
244
245 for (i = 0; i < irq_banks; i++) {
246 /* Save the CPUx interrupt mask for IRQ 0 to 127 */
247 val = wakeupgen_readl(i, 0);
248 sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
249 val = wakeupgen_readl(i, 1);
250 sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);
251
252 /*
253 * Disable the secure interrupts for CPUx. The restore
254 * code blindly restores secure and non-secure interrupt
255 * masks from SAR RAM. Secure interrupts are not suppose
256 * to be enabled from HLOS. So overwrite the SAR location
257 * so that the secure interrupt remains disabled.
258 */
259 sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
260 sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
261 }
262
263 /* Save AuxBoot* registers */
264 val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
265 writel_relaxed(val, sar_base + AUXCOREBOOT0_OFFSET);
266 val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_1);
267 writel_relaxed(val, sar_base + AUXCOREBOOT1_OFFSET);
268
269 /* Save SyncReq generation logic */
270 val = readl_relaxed(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
271 writel_relaxed(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
272 val = readl_relaxed(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
273 writel_relaxed(val, sar_base + PTMSYNCREQ_EN_OFFSET);
274
275 /* Set the Backup Bit Mask status */
276 val = readl_relaxed(sar_base + SAR_BACKUP_STATUS_OFFSET);
277 val |= SAR_BACKUP_STATUS_WAKEUPGEN;
278 writel_relaxed(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
279
280}
281
282static inline void omap5_irq_save_context(void)
283{
284 u32 i, val;
285
286 for (i = 0; i < irq_banks; i++) {
287 /* Save the CPUx interrupt mask for IRQ 0 to 159 */
288 val = wakeupgen_readl(i, 0);
289 sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU0, i);
290 val = wakeupgen_readl(i, 1);
291 sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU1, i);
292 sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
293 sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
294 }
295
296 /* Save AuxBoot* registers */
297 val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
298 writel_relaxed(val, sar_base + OMAP5_AUXCOREBOOT0_OFFSET);
299 val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
300 writel_relaxed(val, sar_base + OMAP5_AUXCOREBOOT1_OFFSET);
301
302 /* Set the Backup Bit Mask status */
303 val = readl_relaxed(sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
304 val |= SAR_BACKUP_STATUS_WAKEUPGEN;
305 writel_relaxed(val, sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
306
307}
308
309static inline void am43xx_irq_save_context(void)
310{
311 u32 i;
312
313 for (i = 0; i < irq_banks; i++) {
314 wakeupgen_context[i] = wakeupgen_readl(i, 0);
315 wakeupgen_writel(0, i, CPU0_ID);
316 }
317}
318
319/*
320 * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
321 * ROM code. WakeupGen IP is integrated along with GIC to manage the
322 * interrupt wakeups from CPU low power states. It manages
323 * masking/unmasking of Shared peripheral interrupts(SPI). So the
324 * interrupt enable/disable control should be in sync and consistent
325 * at WakeupGen and GIC so that interrupts are not lost.
326 */
327static void irq_save_context(void)
328{
329 /* DRA7 has no SAR to save */
330 if (soc_is_dra7xx())
331 return;
332
333 if (wakeupgen_ops && wakeupgen_ops->save_context)
334 wakeupgen_ops->save_context();
335}
336
337/*
338 * Clear WakeupGen SAR backup status.
339 */
340static void irq_sar_clear(void)
341{
342 u32 val;
343 u32 offset = SAR_BACKUP_STATUS_OFFSET;
344 /* DRA7 has no SAR to save */
345 if (soc_is_dra7xx())
346 return;
347
348 if (soc_is_omap54xx())
349 offset = OMAP5_SAR_BACKUP_STATUS_OFFSET;
350
351 val = readl_relaxed(sar_base + offset);
352 val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
353 writel_relaxed(val, sar_base + offset);
354}
355
356static void am43xx_irq_restore_context(void)
357{
358 u32 i;
359
360 for (i = 0; i < irq_banks; i++)
361 wakeupgen_writel(wakeupgen_context[i], i, CPU0_ID);
362}
363
364static void irq_restore_context(void)
365{
366 if (wakeupgen_ops && wakeupgen_ops->restore_context)
367 wakeupgen_ops->restore_context();
368}
369
370/*
371 * Save GIC and Wakeupgen interrupt context using secure API
372 * for HS/EMU devices.
373 */
374static void irq_save_secure_context(void)
375{
376 u32 ret;
377 ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
378 FLAG_START_CRITICAL,
379 0, 0, 0, 0, 0);
380 if (ret != API_HAL_RET_VALUE_OK)
381 pr_err("GIC and Wakeupgen context save failed\n");
382}
383
384/* Define ops for context save and restore for each SoC */
385static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {
386 .save_context = omap4_irq_save_context,
387 .restore_context = irq_sar_clear,
388};
389
390static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {
391 .save_context = omap5_irq_save_context,
392 .restore_context = irq_sar_clear,
393};
394
395static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {
396 .save_context = am43xx_irq_save_context,
397 .restore_context = am43xx_irq_restore_context,
398};
399#else
400static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {};
401static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {};
402static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {};
403#endif
404
405#ifdef CONFIG_HOTPLUG_CPU
406static int omap_wakeupgen_cpu_online(unsigned int cpu)
407{
408 wakeupgen_irqmask_all(cpu, 0);
409 return 0;
410}
411
412static int omap_wakeupgen_cpu_dead(unsigned int cpu)
413{
414 wakeupgen_irqmask_all(cpu, 1);
415 return 0;
416}
417
418static void __init irq_hotplug_init(void)
419{
420 cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "arm/omap-wake:online",
421 omap_wakeupgen_cpu_online, NULL);
422 cpuhp_setup_state_nocalls(CPUHP_ARM_OMAP_WAKE_DEAD,
423 "arm/omap-wake:dead", NULL,
424 omap_wakeupgen_cpu_dead);
425}
426#else
427static void __init irq_hotplug_init(void)
428{}
429#endif
430
431#ifdef CONFIG_CPU_PM
432static int irq_notifier(struct notifier_block *self, unsigned long cmd, void *v)
433{
434 switch (cmd) {
435 case CPU_CLUSTER_PM_ENTER:
436 if (omap_type() == OMAP2_DEVICE_TYPE_GP || soc_is_am43xx())
437 irq_save_context();
438 else
439 irq_save_secure_context();
440 break;
441 case CPU_CLUSTER_PM_EXIT:
442 if (omap_type() == OMAP2_DEVICE_TYPE_GP || soc_is_am43xx())
443 irq_restore_context();
444 break;
445 }
446 return NOTIFY_OK;
447}
448
449static struct notifier_block irq_notifier_block = {
450 .notifier_call = irq_notifier,
451};
452
453static void __init irq_pm_init(void)
454{
455 /* FIXME: Remove this when MPU OSWR support is added */
456 if (!IS_PM44XX_ERRATUM(PM_OMAP4_CPU_OSWR_DISABLE))
457 cpu_pm_register_notifier(&irq_notifier_block);
458}
459#else
460static void __init irq_pm_init(void)
461{}
462#endif
463
464void __iomem *omap_get_wakeupgen_base(void)
465{
466 return wakeupgen_base;
467}
468
469int omap_secure_apis_support(void)
470{
471 return omap_secure_apis;
472}
473
474static struct irq_chip wakeupgen_chip = {
475 .name = "WUGEN",
476 .irq_eoi = irq_chip_eoi_parent,
477 .irq_mask = wakeupgen_mask,
478 .irq_unmask = wakeupgen_unmask,
479 .irq_retrigger = irq_chip_retrigger_hierarchy,
480 .irq_set_type = wakeupgen_irq_set_type,
481 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
482#ifdef CONFIG_SMP
483 .irq_set_affinity = irq_chip_set_affinity_parent,
484#endif
485};
486
487static int wakeupgen_domain_translate(struct irq_domain *d,
488 struct irq_fwspec *fwspec,
489 unsigned long *hwirq,
490 unsigned int *type)
491{
492 if (is_of_node(fwspec->fwnode)) {
493 if (fwspec->param_count != 3)
494 return -EINVAL;
495
496 /* No PPI should point to this domain */
497 if (fwspec->param[0] != 0)
498 return -EINVAL;
499
500 *hwirq = fwspec->param[1];
501 *type = fwspec->param[2];
502 return 0;
503 }
504
505 return -EINVAL;
506}
507
508static int wakeupgen_domain_alloc(struct irq_domain *domain,
509 unsigned int virq,
510 unsigned int nr_irqs, void *data)
511{
512 struct irq_fwspec *fwspec = data;
513 struct irq_fwspec parent_fwspec;
514 irq_hw_number_t hwirq;
515 int i;
516
517 if (fwspec->param_count != 3)
518 return -EINVAL; /* Not GIC compliant */
519 if (fwspec->param[0] != 0)
520 return -EINVAL; /* No PPI should point to this domain */
521
522 hwirq = fwspec->param[1];
523 if (hwirq >= MAX_IRQS)
524 return -EINVAL; /* Can't deal with this */
525
526 for (i = 0; i < nr_irqs; i++)
527 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
528 &wakeupgen_chip, NULL);
529
530 parent_fwspec = *fwspec;
531 parent_fwspec.fwnode = domain->parent->fwnode;
532 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
533 &parent_fwspec);
534}
535
536static const struct irq_domain_ops wakeupgen_domain_ops = {
537 .translate = wakeupgen_domain_translate,
538 .alloc = wakeupgen_domain_alloc,
539 .free = irq_domain_free_irqs_common,
540};
541
542/*
543 * Initialise the wakeupgen module.
544 */
545static int __init wakeupgen_init(struct device_node *node,
546 struct device_node *parent)
547{
548 struct irq_domain *parent_domain, *domain;
549 int i;
550 unsigned int boot_cpu = smp_processor_id();
551 u32 val;
552
553 if (!parent) {
554 pr_err("%pOF: no parent, giving up\n", node);
555 return -ENODEV;
556 }
557
558 parent_domain = irq_find_host(parent);
559 if (!parent_domain) {
560 pr_err("%pOF: unable to obtain parent domain\n", node);
561 return -ENXIO;
562 }
563 /* Not supported on OMAP4 ES1.0 silicon */
564 if (omap_rev() == OMAP4430_REV_ES1_0) {
565 WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
566 return -EPERM;
567 }
568
569 /* Static mapping, never released */
570 wakeupgen_base = of_iomap(node, 0);
571 if (WARN_ON(!wakeupgen_base))
572 return -ENOMEM;
573
574 if (cpu_is_omap44xx()) {
575 irq_banks = OMAP4_NR_BANKS;
576 max_irqs = OMAP4_NR_IRQS;
577 omap_secure_apis = 1;
578 wakeupgen_ops = &omap4_wakeupgen_ops;
579 } else if (soc_is_omap54xx()) {
580 wakeupgen_ops = &omap5_wakeupgen_ops;
581 } else if (soc_is_am43xx()) {
582 irq_banks = AM43XX_NR_REG_BANKS;
583 max_irqs = AM43XX_IRQS;
584 wakeupgen_ops = &am43xx_wakeupgen_ops;
585 }
586
587 domain = irq_domain_add_hierarchy(parent_domain, 0, max_irqs,
588 node, &wakeupgen_domain_ops,
589 NULL);
590 if (!domain) {
591 iounmap(wakeupgen_base);
592 return -ENOMEM;
593 }
594
595 /* Clear all IRQ bitmasks at wakeupGen level */
596 for (i = 0; i < irq_banks; i++) {
597 wakeupgen_writel(0, i, CPU0_ID);
598 if (!soc_is_am43xx())
599 wakeupgen_writel(0, i, CPU1_ID);
600 }
601
602 /*
603 * FIXME: Add support to set_smp_affinity() once the core
604 * GIC code has necessary hooks in place.
605 */
606
607 /* Associate all the IRQs to boot CPU like GIC init does. */
608 for (i = 0; i < max_irqs; i++)
609 irq_target_cpu[i] = boot_cpu;
610
611 /*
612 * Enables OMAP5 ES2 PM Mode using ES2_PM_MODE in AMBA_IF_MODE
613 * 0x0: ES1 behavior, CPU cores would enter and exit OFF mode together.
614 * 0x1: ES2 behavior, CPU cores are allowed to enter/exit OFF mode
615 * independently.
616 * This needs to be set one time thanks to always ON domain.
617 *
618 * We do not support ES1 behavior anymore. OMAP5 is assumed to be
619 * ES2.0, and the same is applicable for DRA7.
620 */
621 if (soc_is_omap54xx() || soc_is_dra7xx()) {
622 val = __raw_readl(wakeupgen_base + OMAP_AMBA_IF_MODE);
623 val |= BIT(5);
624 omap_smc1(OMAP5_MON_AMBA_IF_INDEX, val);
625 }
626
627 irq_hotplug_init();
628 irq_pm_init();
629
630 sar_base = omap4_get_sar_ram_base();
631
632 return 0;
633}
634IRQCHIP_DECLARE(ti_wakeupgen, "ti,omap4-wugen-mpu", wakeupgen_init);