summaryrefslogtreecommitdiff
path: root/arch/arm/mach-mx5/lpmodes.c
blob: 32af9ccc4f6a9a72eb02f65585924509c04049f8 (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
/*
 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

/*!
 * @file mx51_lpmodes.c
 *
 * @brief Driver for the Freescale Semiconductor MXC low power modes setup.
 *
 * MX51 is designed to play and video with minimal power consumption.
 * This driver enables the platform to enter and exit audio and video low
 * power modes.
 *
 * @ingroup PM
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <mach/clock.h>
#include <mach/hardware.h>
#include <linux/regulator/machine.h>
#include "crm_regs.h"

#define ARM_LP_CLK  166250000
#define GP_LPM_VOLTAGE 775000
#define GP_NORMAL_VOLTAGE 1050000

static int org_cpu_rate;
int lp_video_mode;
int lp_audio_mode;
static struct device *lpmode_dev;
struct regulator *gp_core;

void enter_lp_video_mode(void)
{
}

void exit_lp_video_mode(void)
{
}

void enter_lp_audio_mode(void)
{
	struct clk *tclk;
	int ret;

	struct clk *p_clk;
	struct clk *amode_parent_clk;


	tclk = clk_get(NULL, "ipu_clk");
	if (clk_get_usecount(tclk) != 0) {
		printk(KERN_INFO
		"Cannot enter AUDIO LPM mode - display is still active\n");
		return;
	}

	tclk = clk_get(NULL, "cpu_clk");
	org_cpu_rate = clk_get_rate(tclk);

#ifdef CHANGE_DDR2_TO_PLL2
	tclk = clk_get(NULL, "ddr_clk");
	clk_set_parent(tclk, clk_get(NULL, "axi_a_clk"));

	/* Set CPU clock to be derived from PLL2 instead of PLL1 */
	tclk = clk_get(NULL, "pll1_sw_clk");
	clk_set_parent(tclk, clk_get(NULL, "pll2"));
	clk_enable(tclk);

	tclk = clk_get(NULL, "ddr_clk");
	clk_set_parent(tclk, clk_get(NULL, "ddr_hf_clk"));
#endif

	/*Change the DDR freq to 133Mhz. */
	tclk = clk_get(NULL, "ddr_hf_clk");
	clk_set_rate(tclk, clk_round_rate(tclk, 133000000));

	tclk = clk_get(NULL, "cpu_clk");
	ret = clk_set_rate(tclk, ARM_LP_CLK);
	if (ret != 0)
		printk(KERN_DEBUG "cannot set CPU clock rate\n");
	clk_put(tclk);
	/* Set the voltage to 0.775v for the GP domain. */
	ret = regulator_set_voltage(gp_core, GP_LPM_VOLTAGE, GP_LPM_VOLTAGE);
	if (ret < 0)
		printk(KERN_DEBUG "COULD NOT SET GP VOLTAGE!!!\n");

	tclk = clk_get(NULL, "periph_apm_clk");
	amode_parent_clk = clk_get(NULL, "lp_apm");
	p_clk = clk_get_parent(tclk);
	/* Make sure osc_clk is the parent of lp_apm. */
	clk_set_parent(amode_parent_clk, clk_get(NULL, "osc"));
	/* Set the parent of periph_apm_clk to be lp_apm */
	clk_set_parent(tclk, amode_parent_clk);

	amode_parent_clk = tclk;

	tclk = clk_get(NULL, "main_bus_clk");
	p_clk = clk_get_parent(tclk);
	/* Set the parent of main_bus_clk to be periph_apm_clk */
	clk_set_parent(tclk, amode_parent_clk);

	clk_set_rate(clk_get(NULL, "axi_a_clk"), 24000000);
	clk_set_rate(clk_get(NULL, "axi_b_clk"), 24000000);
	clk_set_rate(clk_get(NULL, "ahb_clk"), 24000000);
	clk_set_rate(clk_get(NULL, "emi_slow_clk"), 24000000);
	clk_set_rate(clk_get(NULL, "nfc_clk"), 12000000);

	/* disable PLL3 */
	tclk = clk_get(NULL, "pll3");
	if (tclk->usecount == 1)
		clk_disable(tclk);

	/* disable PLL2 */
	tclk = clk_get(NULL, "pll2");
	if (tclk->usecount == 1)
		clk_disable(tclk);

	/* disable PLL1 */
	tclk = clk_get(NULL, "pll1_main_clk");
	if (tclk->usecount == 1)
		clk_disable(tclk);

	lp_audio_mode = 1;
}

void exit_lp_audio_mode(void)
{
	struct clk *tclk;
	struct clk *p_clk;
	struct clk *rmode_parent_clk;
	int ret;

	/* Set the voltage to 1.05v for the GP domain. */
	ret = regulator_set_voltage(gp_core,
				    GP_NORMAL_VOLTAGE, GP_NORMAL_VOLTAGE);
	if (ret < 0)
		printk(KERN_DEBUG "COULD NOT SET GP VOLTAGE!!!\n");

	rmode_parent_clk = clk_get(NULL, "pll2");
	clk_enable(rmode_parent_clk);

	tclk = clk_get(NULL, "main_bus_clk");
	p_clk = clk_get_parent(tclk);

	/* Set the dividers before setting the parent clock. */
	clk_set_rate(clk_get(NULL, "axi_a_clk"), 6000000);
	clk_set_rate(clk_get(NULL, "axi_b_clk"), 4800000);
	clk_set_rate(clk_get(NULL, "ahb_clk"), 4800000);
	clk_set_rate(clk_get(NULL, "emi_slow_clk"), 4800000);
	clk_set_rate(clk_get(NULL, "nfc_clk"), 1200000);
	/* Set the parent of main_bus_clk to be pll2 */
	clk_set_parent(tclk, rmode_parent_clk);

#ifdef CHANGE_DDR2_TO_PLL2
	tclk = clk_get(NULL, "ddr_clk");
	clk_set_parent(tclk, clk_get(NULL, "axi_a_clk"));

	/* Set CPU clock to be derived from PLL1 instead of PLL2 */
	tclk = clk_get(NULL, "pll1_sw_clk");
	clk_set_parent(tclk, clk_get(NULL, "pll1_main_clk"));
	clk_disable(tclk);

	tclk = clk_get(NULL, "ddr_clk");
	clk_set_parent(tclk, clk_get(NULL, "ddr_hf_clk"));
#endif

	tclk = clk_get(NULL, "cpu_clk");
	ret = clk_set_rate(tclk, org_cpu_rate);
	if (ret != 0)
		printk(KERN_DEBUG "cannot set CPU clock rate\n");
	clk_put(tclk);

	tclk = clk_get(NULL, "cpu_clk");

	ret = clk_set_rate(tclk, org_cpu_rate);
	if (ret != 0)
		printk(KERN_DEBUG "cannot set CPU clock rate\n");


	/*Change the DDR freq to 200MHz*/
	tclk = clk_get(NULL, "ddr_hf_clk");
	clk_set_rate(tclk, clk_round_rate(tclk, 200000000));
	lp_audio_mode = 0;

}

static ssize_t lp_curr_mode(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	if (lp_video_mode)
		return sprintf(buf, "in lp_video_mode\n");
	else if (lp_audio_mode)
		return sprintf(buf, "in lp_audio_mode\n");
	else
		return sprintf(buf, "in normal mode\n");
}

static ssize_t set_lp_mode(struct device *dev,
			   struct device_attribute *attr,
			   const char *buf, size_t size)
{
	printk(KERN_DEBUG "In set_lp_mode() \n");

	if (strstr(buf, "enable_lp_video") != NULL) {
		if (!lp_video_mode)
			enter_lp_video_mode();
	} else if (strstr(buf, "disable_lp_video") != NULL) {
		if (lp_video_mode)
			exit_lp_video_mode();
	} else if (strstr(buf, "enable_lp_audio") != NULL) {
		if (!lp_audio_mode)
			enter_lp_audio_mode();
	} else if (strstr(buf, "disable_lp_audio") != NULL) {
		if (lp_audio_mode)
			exit_lp_audio_mode();
	}
	return size;
}

static DEVICE_ATTR(lp_modes, 0644, lp_curr_mode, set_lp_mode);

/*!
 * This is the probe routine for the lp_mode driver.
 *
 * @param   pdev   The platform device structure
 *
 * @return         The function returns 0 on success
 *
 */
static int __devinit mx51_lpmode_probe(struct platform_device *pdev)
{
	u32 res = 0;
	lpmode_dev = &pdev->dev;

	res = sysfs_create_file(&lpmode_dev->kobj, &dev_attr_lp_modes.attr);
	if (res) {
		printk(KERN_ERR
		"lpmode_dev: Unable to register sysdev entry for lpmode_dev");
		return res;
	}

	if (res != 0) {
		printk(KERN_ERR "lpmode_dev: Unable to start");
		return res;
	}
	gp_core = regulator_get(NULL, "SW1");
	lp_video_mode = 0;
	lp_audio_mode = 0;

	return 0;
}

static struct platform_driver mx51_lpmode_driver = {
	.driver = {
		   .name = "mx51_lpmode",
		   },
	.probe = mx51_lpmode_probe,
};

/*!
 * Initialise the mx51_lpmode_driver.
 *
 * @return  The function always returns 0.
 */

static int __init lpmode_init(void)
{
	if (platform_driver_register(&mx51_lpmode_driver) != 0) {
		printk(KERN_ERR "mx37_lpmode_driver register failed\n");
		return -ENODEV;
	}

	printk(KERN_INFO "LPMode driver module loaded\n");
	return 0;
}

static void __exit lpmode_cleanup(void)
{
	sysfs_remove_file(&lpmode_dev->kobj, &dev_attr_lp_modes.attr);

	/* Unregister the device structure */
	platform_driver_unregister(&mx51_lpmode_driver);
}

module_init(lpmode_init);
module_exit(lpmode_cleanup);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("LPMode driver");
MODULE_LICENSE("GPL");