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Eduardo Valentin78673bc2008-07-03 12:24:40 +03001/*
2 * linux/arch/arm/mach-omap2/mcbsp.c
3 *
4 * Copyright (C) 2008 Instituto Nokia de Tecnologia
5 * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Multichannel mode not supported.
12 */
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/clk.h>
16#include <linux/err.h>
17#include <linux/io.h>
18#include <linux/platform_device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Eduardo Valentin78673bc2008-07-03 12:24:40 +030020
Tony Lindgrendd7667a2009-01-15 13:09:51 +020021#include <mach/irqs.h>
Tony Lindgrence491cf2009-10-20 09:40:47 -070022#include <plat/dma.h>
Tony Lindgrence491cf2009-10-20 09:40:47 -070023#include <plat/cpu.h>
24#include <plat/mcbsp.h>
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +053025#include <plat/omap_device.h>
Kishon Vijay Abraham Ie95496d2011-02-24 15:16:54 +053026#include <linux/pm_runtime.h>
Paul Walmsley4814ced2010-10-08 11:40:20 -060027
28#include "control.h"
29
Jarkko Nikula1743d142011-09-26 10:45:44 +030030/*
31 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
32 * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
33 */
34#include "cm2xxx_3xxx.h"
35#include "cm-regbits-34xx.h"
36
Jarkko Nikula7bc0c4b2011-09-26 10:45:49 +030037/* McBSP internal signal muxing function */
38static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
39 const char *src)
Paul Walmsleycf4c87a2010-10-08 11:40:19 -060040{
41 u32 v;
42
43 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
Paul Walmsleycf4c87a2010-10-08 11:40:19 -060044
Jarkko Nikula7bc0c4b2011-09-26 10:45:49 +030045 if (!strcmp(signal, "clkr")) {
46 if (!strcmp(src, "clkr"))
47 v &= ~OMAP2_MCBSP1_CLKR_MASK;
48 else if (!strcmp(src, "clkx"))
49 v |= OMAP2_MCBSP1_CLKR_MASK;
50 else
51 return -EINVAL;
52 } else if (!strcmp(signal, "fsr")) {
53 if (!strcmp(src, "fsr"))
54 v &= ~OMAP2_MCBSP1_FSR_MASK;
55 else if (!strcmp(src, "fsx"))
56 v |= OMAP2_MCBSP1_FSR_MASK;
57 else
58 return -EINVAL;
59 } else {
60 return -EINVAL;
61 }
Paul Walmsleycf4c87a2010-10-08 11:40:19 -060062
Paul Walmsleycf4c87a2010-10-08 11:40:19 -060063 omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
Jarkko Nikula7bc0c4b2011-09-26 10:45:49 +030064
65 return 0;
Paul Walmsleycf4c87a2010-10-08 11:40:19 -060066}
Paul Walmsleycf4c87a2010-10-08 11:40:19 -060067
Paul Walmsleyd1358652010-10-08 11:40:19 -060068/* McBSP CLKS source switching function */
Jarkko Nikula09d28d22011-09-26 10:45:48 +030069static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
70 const char *src)
Paul Walmsleyd1358652010-10-08 11:40:19 -060071{
Paul Walmsleyd1358652010-10-08 11:40:19 -060072 struct clk *fck_src;
73 char *fck_src_name;
74 int r;
75
Jarkko Nikula09d28d22011-09-26 10:45:48 +030076 if (!strcmp(src, "clks_ext"))
Paul Walmsleyd1358652010-10-08 11:40:19 -060077 fck_src_name = "pad_fck";
Jarkko Nikula09d28d22011-09-26 10:45:48 +030078 else if (!strcmp(src, "clks_fclk"))
Paul Walmsleyd1358652010-10-08 11:40:19 -060079 fck_src_name = "prcm_fck";
80 else
81 return -EINVAL;
82
Jarkko Nikula09d28d22011-09-26 10:45:48 +030083 fck_src = clk_get(dev, fck_src_name);
Paul Walmsleyd1358652010-10-08 11:40:19 -060084 if (IS_ERR_OR_NULL(fck_src)) {
85 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
86 fck_src_name);
87 return -EINVAL;
88 }
89
Jarkko Nikula09d28d22011-09-26 10:45:48 +030090 pm_runtime_put_sync(dev);
Paul Walmsleyd1358652010-10-08 11:40:19 -060091
Jarkko Nikula09d28d22011-09-26 10:45:48 +030092 r = clk_set_parent(clk, fck_src);
Paul Walmsleyd1358652010-10-08 11:40:19 -060093 if (IS_ERR_VALUE(r)) {
94 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
95 "clks", fck_src_name);
96 clk_put(fck_src);
97 return -EINVAL;
98 }
99
Jarkko Nikula09d28d22011-09-26 10:45:48 +0300100 pm_runtime_get_sync(dev);
Paul Walmsleyd1358652010-10-08 11:40:19 -0600101
102 clk_put(fck_src);
103
104 return 0;
105}
Paul Walmsleyd1358652010-10-08 11:40:19 -0600106
Jarkko Nikula1743d142011-09-26 10:45:44 +0300107static int omap3_enable_st_clock(unsigned int id, bool enable)
108{
109 unsigned int w;
110
111 /*
112 * Sidetone uses McBSP ICLK - which must not idle when sidetones
113 * are enabled or sidetones start sounding ugly.
114 */
115 w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
116 if (enable)
117 w &= ~(1 << (id - 2));
118 else
119 w |= 1 << (id - 2);
120 omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
121
122 return 0;
123}
124
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530125static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
126{
127 int id, count = 1;
128 char *name = "omap-mcbsp";
129 struct omap_hwmod *oh_device[2];
130 struct omap_mcbsp_platform_data *pdata = NULL;
Kevin Hilman3528c582011-07-21 13:48:45 -0700131 struct platform_device *pdev;
Eduardo Valentin78673bc2008-07-03 12:24:40 +0300132
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530133 sscanf(oh->name, "mcbsp%d", &id);
134
135 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
136 if (!pdata) {
137 pr_err("%s: No memory for mcbsp\n", __func__);
138 return -ENOMEM;
139 }
140
Jarkko Nikulacdc715142011-09-26 10:45:39 +0300141 pdata->reg_step = 4;
Jarkko Nikula88408232011-09-26 10:45:41 +0300142 if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
Jarkko Nikulacdc715142011-09-26 10:45:39 +0300143 pdata->reg_size = 2;
Jarkko Nikula88408232011-09-26 10:45:41 +0300144 } else {
Jarkko Nikulacdc715142011-09-26 10:45:39 +0300145 pdata->reg_size = 4;
Jarkko Nikula88408232011-09-26 10:45:41 +0300146 pdata->has_ccr = true;
147 }
Jarkko Nikula0c8551e2011-12-12 10:38:26 +0200148 pdata->set_clk_src = omap2_mcbsp_set_clk_src;
149 if (id == 1)
150 pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;
Kishon Vijay Abraham I9504ba62011-02-24 15:16:55 +0530151
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530152 if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
153 if (id == 2)
154 /* The FIFO has 1024 + 256 locations */
155 pdata->buffer_size = 0x500;
156 else
157 /* The FIFO has 128 locations */
158 pdata->buffer_size = 0x80;
159 }
160
Jarkko Nikula1a645882011-09-26 10:45:40 +0300161 if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
162 pdata->has_wakeup = true;
163
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530164 oh_device[0] = oh;
165
166 if (oh->dev_attr) {
167 oh_device[1] = omap_hwmod_lookup((
168 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
Jarkko Nikula1743d142011-09-26 10:45:44 +0300169 pdata->enable_st_clock = omap3_enable_st_clock;
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530170 count++;
171 }
Kevin Hilman3528c582011-07-21 13:48:45 -0700172 pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
Benoit Coussonf718e2c2011-08-10 15:30:09 +0200173 sizeof(*pdata), NULL, 0, false);
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530174 kfree(pdata);
Kevin Hilman3528c582011-07-21 13:48:45 -0700175 if (IS_ERR(pdev)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300176 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530177 name, oh->name);
Kevin Hilman3528c582011-07-21 13:48:45 -0700178 return PTR_ERR(pdev);
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530179 }
180 omap_mcbsp_count++;
181 return 0;
182}
Syed Rafiuddina5b92cc2009-07-28 18:57:10 +0530183
Chandra Shekharb4b58f52008-10-08 10:01:39 +0300184static int __init omap2_mcbsp_init(void)
Eduardo Valentin78673bc2008-07-03 12:24:40 +0300185{
Kishon Vijay Abraham I64bcbd32011-02-24 15:16:52 +0530186 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
Chandra Shekharb4b58f52008-10-08 10:01:39 +0300187
188 mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
189 GFP_KERNEL);
190 if (!mcbsp_ptr)
191 return -ENOMEM;
192
Eduardo Valentin78673bc2008-07-03 12:24:40 +0300193 return omap_mcbsp_init();
194}
195arch_initcall(omap2_mcbsp_init);