summaryrefslogtreecommitdiff
path: root/drivers/soc/ti/pm33xx.c
blob: 652739c7f71845b86a331189570604dd66b5f43c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
// SPDX-License-Identifier: GPL-2.0
/*
 * AM33XX Power Management Routines
 *
 * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/
 *	Vaibhav Bedia, Dave Gerlach
 */

#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/genalloc.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_data/pm33xx.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/sram.h>
#include <linux/suspend.h>
#include <linux/ti-emif-sram.h>
#include <linux/wkup_m3_ipc.h>

#include <asm/proc-fns.h>
#include <asm/suspend.h>
#include <asm/system_misc.h>

#define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
					 (unsigned long)pm_sram->do_wfi)

static int (*am33xx_do_wfi_sram)(unsigned long unused);
static phys_addr_t am33xx_do_wfi_sram_phys;

static struct gen_pool *sram_pool, *sram_pool_data;
static unsigned long ocmcram_location, ocmcram_location_data;

static struct am33xx_pm_platform_data *pm_ops;
static struct am33xx_pm_sram_addr *pm_sram;

static struct device *pm33xx_dev;
static struct wkup_m3_ipc *m3_ipc;

static u32 sram_suspend_address(unsigned long addr)
{
	return ((unsigned long)am33xx_do_wfi_sram +
		AMX3_PM_SRAM_SYMBOL_OFFSET(addr));
}

#ifdef CONFIG_SUSPEND
static int am33xx_pm_suspend(suspend_state_t suspend_state)
{
	int i, ret = 0;

	ret = pm_ops->soc_suspend((unsigned long)suspend_state,
				  am33xx_do_wfi_sram);

	if (ret) {
		dev_err(pm33xx_dev, "PM: Kernel suspend failure\n");
	} else {
		i = m3_ipc->ops->request_pm_status(m3_ipc);

		switch (i) {
		case 0:
			dev_info(pm33xx_dev,
				 "PM: Successfully put all powerdomains to target state\n");
			break;
		case 1:
			dev_err(pm33xx_dev,
				"PM: Could not transition all powerdomains to target state\n");
			ret = -1;
			break;
		default:
			dev_err(pm33xx_dev,
				"PM: CM3 returned unknown result = %d\n", i);
			ret = -1;
		}
	}

	return ret;
}

static int am33xx_pm_enter(suspend_state_t suspend_state)
{
	int ret = 0;

	switch (suspend_state) {
	case PM_SUSPEND_MEM:
	case PM_SUSPEND_STANDBY:
		ret = am33xx_pm_suspend(suspend_state);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int am33xx_pm_begin(suspend_state_t state)
{
	int ret = -EINVAL;

	switch (state) {
	case PM_SUSPEND_MEM:
		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP);
		break;
	case PM_SUSPEND_STANDBY:
		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY);
		break;
	}

	return ret;
}

static void am33xx_pm_end(void)
{
	m3_ipc->ops->finish_low_power(m3_ipc);
}

static int am33xx_pm_valid(suspend_state_t state)
{
	switch (state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		return 1;
	default:
		return 0;
	}
}

static const struct platform_suspend_ops am33xx_pm_ops = {
	.begin		= am33xx_pm_begin,
	.end		= am33xx_pm_end,
	.enter		= am33xx_pm_enter,
	.valid		= am33xx_pm_valid,
};
#endif /* CONFIG_SUSPEND */

static void am33xx_pm_set_ipc_ops(void)
{
	u32 resume_address;
	int temp;

	temp = ti_emif_get_mem_type();
	if (temp < 0) {
		dev_err(pm33xx_dev, "PM: Cannot determine memory type, no PM available\n");
		return;
	}
	m3_ipc->ops->set_mem_type(m3_ipc, temp);

	/* Physical resume address to be used by ROM code */
	resume_address = am33xx_do_wfi_sram_phys +
			 *pm_sram->resume_offset + 0x4;

	m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address);
}

static void am33xx_pm_free_sram(void)
{
	gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);
	gen_pool_free(sram_pool_data, ocmcram_location_data,
		      sizeof(struct am33xx_pm_ro_sram_data));
}

/*
 * Push the minimal suspend-resume code to SRAM
 */
static int am33xx_pm_alloc_sram(void)
{
	struct device_node *np;
	int ret = 0;

	np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu");
	if (!np) {
		np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
		if (!np) {
			dev_err(pm33xx_dev, "PM: %s: Unable to find device node for mpu\n",
				__func__);
			return -ENODEV;
		}
	}

	sram_pool = of_gen_pool_get(np, "pm-sram", 0);
	if (!sram_pool) {
		dev_err(pm33xx_dev, "PM: %s: Unable to get sram pool for ocmcram\n",
			__func__);
		ret = -ENODEV;
		goto mpu_put_node;
	}

	sram_pool_data = of_gen_pool_get(np, "pm-sram", 1);
	if (!sram_pool_data) {
		dev_err(pm33xx_dev, "PM: %s: Unable to get sram data pool for ocmcram\n",
			__func__);
		ret = -ENODEV;
		goto mpu_put_node;
	}

	ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz);
	if (!ocmcram_location) {
		dev_err(pm33xx_dev, "PM: %s: Unable to allocate memory from ocmcram\n",
			__func__);
		ret = -ENOMEM;
		goto mpu_put_node;
	}

	ocmcram_location_data = gen_pool_alloc(sram_pool_data,
					       sizeof(struct emif_regs_amx3));
	if (!ocmcram_location_data) {
		dev_err(pm33xx_dev, "PM: Unable to allocate memory from ocmcram\n");
		gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);
		ret = -ENOMEM;
	}

mpu_put_node:
	of_node_put(np);
	return ret;
}

static int am33xx_push_sram_idle(void)
{
	struct am33xx_pm_ro_sram_data ro_sram_data;
	int ret;
	u32 table_addr, ro_data_addr;
	void *copy_addr;

	ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data;
	ro_sram_data.amx3_pm_sram_data_phys =
		gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data);

	/* Save physical address to calculate resume offset during pm init */
	am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool,
							ocmcram_location);

	am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location,
					    pm_sram->do_wfi,
					    *pm_sram->do_wfi_sz);
	if (!am33xx_do_wfi_sram) {
		dev_err(pm33xx_dev,
			"PM: %s: am33xx_do_wfi copy to sram failed\n",
			__func__);
		return -ENODEV;
	}

	table_addr =
		sram_suspend_address((unsigned long)pm_sram->emif_sram_table);
	ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr);
	if (ret) {
		dev_dbg(pm33xx_dev,
			"PM: %s: EMIF function copy failed\n", __func__);
		return -EPROBE_DEFER;
	}

	ro_data_addr =
		sram_suspend_address((unsigned long)pm_sram->ro_sram_data);
	copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr,
				   &ro_sram_data,
				   sizeof(ro_sram_data));
	if (!copy_addr) {
		dev_err(pm33xx_dev,
			"PM: %s: ro_sram_data copy to sram failed\n",
			__func__);
		return -ENODEV;
	}

	return 0;
}

static int am33xx_pm_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	int ret;

	if (!of_machine_is_compatible("ti,am33xx") &&
	    !of_machine_is_compatible("ti,am43"))
		return -ENODEV;

	pm_ops = dev->platform_data;
	if (!pm_ops) {
		dev_err(dev, "PM: Cannot get core PM ops!\n");
		return -ENODEV;
	}

	pm_sram = pm_ops->get_sram_addrs();
	if (!pm_sram) {
		dev_err(dev, "PM: Cannot get PM asm function addresses!!\n");
		return -ENODEV;
	}

	pm33xx_dev = dev;

	ret = am33xx_pm_alloc_sram();
	if (ret)
		return ret;

	ret = am33xx_push_sram_idle();
	if (ret)
		goto err_free_sram;

	m3_ipc = wkup_m3_ipc_get();
	if (!m3_ipc) {
		dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n");
		ret = -EPROBE_DEFER;
		goto err_free_sram;
	}

	am33xx_pm_set_ipc_ops();

#ifdef CONFIG_SUSPEND
	suspend_set_ops(&am33xx_pm_ops);
#endif /* CONFIG_SUSPEND */

	ret = pm_ops->init();
	if (ret) {
		dev_err(dev, "Unable to call core pm init!\n");
		ret = -ENODEV;
		goto err_put_wkup_m3_ipc;
	}

	return 0;

err_put_wkup_m3_ipc:
	wkup_m3_ipc_put(m3_ipc);
err_free_sram:
	am33xx_pm_free_sram();
	pm33xx_dev = NULL;
	return ret;
}

static int am33xx_pm_remove(struct platform_device *pdev)
{
	suspend_set_ops(NULL);
	wkup_m3_ipc_put(m3_ipc);
	am33xx_pm_free_sram();
	return 0;
}

static struct platform_driver am33xx_pm_driver = {
	.driver = {
		.name   = "pm33xx",
	},
	.probe = am33xx_pm_probe,
	.remove = am33xx_pm_remove,
};
module_platform_driver(am33xx_pm_driver);

MODULE_ALIAS("platform:pm33xx");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("am33xx power management driver");