summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/mcbsp.c
blob: 219a6e800bad2f58af15b6af9050df42374b904b (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
/*
 * linux/arch/arm/mach-omap2/mcbsp.c
 *
 * Copyright (C) 2008 Instituto Nokia de Tecnologia
 * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Multichannel mode not supported.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <plat/dma.h>
#include <plat/cpu.h>
#include <plat/mcbsp.h>
#include <plat/omap_device.h>
#include <linux/pm_runtime.h>

#include "control.h"

/*
 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
 * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
 */
#include "cm2xxx_3xxx.h"
#include "cm-regbits-34xx.h"

/* McBSP1 internal signal muxing function for OMAP2/3 */
static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
				   const char *src)
{
	u32 v;

	v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);

	if (!strcmp(signal, "clkr")) {
		if (!strcmp(src, "clkr"))
			v &= ~OMAP2_MCBSP1_CLKR_MASK;
		else if (!strcmp(src, "clkx"))
			v |= OMAP2_MCBSP1_CLKR_MASK;
		else
			return -EINVAL;
	} else if (!strcmp(signal, "fsr")) {
		if (!strcmp(src, "fsr"))
			v &= ~OMAP2_MCBSP1_FSR_MASK;
		else if (!strcmp(src, "fsx"))
			v |= OMAP2_MCBSP1_FSR_MASK;
		else
			return -EINVAL;
	} else {
		return -EINVAL;
	}

	omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);

	return 0;
}

/* McBSP4 internal signal muxing function for OMAP4 */
#define OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX	(1 << 31)
#define OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX	(1 << 30)
static int omap4_mcbsp4_mux_rx_clk(struct device *dev, const char *signal,
				   const char *src)
{
	u32 v;

	/*
	 * In CONTROL_MCBSPLP register only bit 30 (CLKR mux), and bit 31 (FSR
	 * mux) is used */
	v = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MCBSPLP);

	if (!strcmp(signal, "clkr")) {
		if (!strcmp(src, "clkr"))
			v &= ~OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX;
		else if (!strcmp(src, "clkx"))
			v |= OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX;
		else
			return -EINVAL;
	} else if (!strcmp(signal, "fsr")) {
		if (!strcmp(src, "fsr"))
			v &= ~OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX;
		else if (!strcmp(src, "fsx"))
			v |= OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX;
		else
			return -EINVAL;
	} else {
		return -EINVAL;
	}

	omap4_ctrl_pad_writel(v, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MCBSPLP);

	return 0;
}

/* McBSP CLKS source switching function */
static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
				   const char *src)
{
	struct clk *fck_src;
	char *fck_src_name;
	int r;

	if (!strcmp(src, "clks_ext"))
		fck_src_name = "pad_fck";
	else if (!strcmp(src, "clks_fclk"))
		fck_src_name = "prcm_fck";
	else
		return -EINVAL;

	fck_src = clk_get(dev, fck_src_name);
	if (IS_ERR_OR_NULL(fck_src)) {
		pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
		       fck_src_name);
		return -EINVAL;
	}

	pm_runtime_put_sync(dev);

	r = clk_set_parent(clk, fck_src);
	if (IS_ERR_VALUE(r)) {
		pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
		       "clks", fck_src_name);
		clk_put(fck_src);
		return -EINVAL;
	}

	pm_runtime_get_sync(dev);

	clk_put(fck_src);

	return 0;
}

static int omap3_enable_st_clock(unsigned int id, bool enable)
{
	unsigned int w;

	/*
	 * Sidetone uses McBSP ICLK - which must not idle when sidetones
	 * are enabled or sidetones start sounding ugly.
	 */
	w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
	if (enable)
		w &= ~(1 << (id - 2));
	else
		w |= 1 << (id - 2);
	omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);

	return 0;
}

static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
{
	int id, count = 1;
	char *name = "omap-mcbsp";
	struct omap_hwmod *oh_device[2];
	struct omap_mcbsp_platform_data *pdata = NULL;
	struct platform_device *pdev;

	sscanf(oh->name, "mcbsp%d", &id);

	pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
	if (!pdata) {
		pr_err("%s: No memory for mcbsp\n", __func__);
		return -ENOMEM;
	}

	pdata->reg_step = 4;
	if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
		pdata->reg_size = 2;
	} else {
		pdata->reg_size = 4;
		pdata->has_ccr = true;
	}
	pdata->set_clk_src = omap2_mcbsp_set_clk_src;

	/* On OMAP2/3 the McBSP1 port has 6 pin configuration */
	if (id == 1 && oh->class->rev < MCBSP_CONFIG_TYPE4)
		pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;

	/* On OMAP4 the McBSP4 port has 6 pin configuration */
	if (id == 4 && oh->class->rev == MCBSP_CONFIG_TYPE4)
		pdata->mux_signal = omap4_mcbsp4_mux_rx_clk;

	if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
		if (id == 2)
			/* The FIFO has 1024 + 256 locations */
			pdata->buffer_size = 0x500;
		else
			/* The FIFO has 128 locations */
			pdata->buffer_size = 0x80;
	} else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
		/* The FIFO has 128 locations for all instances */
		pdata->buffer_size = 0x80;
	}

	if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
		pdata->has_wakeup = true;

	oh_device[0] = oh;

	if (oh->dev_attr) {
		oh_device[1] = omap_hwmod_lookup((
		(struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
		pdata->enable_st_clock = omap3_enable_st_clock;
		count++;
	}
	pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
				sizeof(*pdata), NULL, 0, false);
	kfree(pdata);
	if (IS_ERR(pdev))  {
		pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
					name, oh->name);
		return PTR_ERR(pdev);
	}
	return 0;
}

static int __init omap2_mcbsp_init(void)
{
	omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);

	return 0;
}
arch_initcall(omap2_mcbsp_init);
OpenPOWER on IntegriCloud