Merge commit 'v2.6.39' into 20110526
[linux-2.6.git] / arch / arm / mach-omap2 / mcbsp.c
1 /*
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>
19 #include <linux/slab.h>
20
21 #include <mach/irqs.h>
22 #include <plat/dma.h>
23 #include <plat/cpu.h>
24 #include <plat/mcbsp.h>
25 #include <plat/omap_device.h>
26 #include <linux/pm_runtime.h>
27
28 #include "control.h"
29
30 /* McBSP internal signal muxing functions */
31
32 void omap2_mcbsp1_mux_clkr_src(u8 mux)
33 {
34         u32 v;
35
36         v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
37         if (mux == CLKR_SRC_CLKR)
38                 v &= ~OMAP2_MCBSP1_CLKR_MASK;
39         else if (mux == CLKR_SRC_CLKX)
40                 v |= OMAP2_MCBSP1_CLKR_MASK;
41         omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
42 }
43 EXPORT_SYMBOL(omap2_mcbsp1_mux_clkr_src);
44
45 void omap2_mcbsp1_mux_fsr_src(u8 mux)
46 {
47         u32 v;
48
49         v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
50         if (mux == FSR_SRC_FSR)
51                 v &= ~OMAP2_MCBSP1_FSR_MASK;
52         else if (mux == FSR_SRC_FSX)
53                 v |= OMAP2_MCBSP1_FSR_MASK;
54         omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
55 }
56 EXPORT_SYMBOL(omap2_mcbsp1_mux_fsr_src);
57
58 /* McBSP CLKS source switching function */
59
60 int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
61 {
62         struct omap_mcbsp *mcbsp;
63         struct clk *fck_src;
64         char *fck_src_name;
65         int r;
66
67         if (!omap_mcbsp_check_valid_id(id)) {
68                 pr_err("%s: Invalid id (%d)\n", __func__, id + 1);
69                 return -EINVAL;
70         }
71         mcbsp = id_to_mcbsp_ptr(id);
72
73         if (fck_src_id == MCBSP_CLKS_PAD_SRC)
74                 fck_src_name = "pad_fck";
75         else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
76                 fck_src_name = "prcm_fck";
77         else
78                 return -EINVAL;
79
80         fck_src = clk_get(mcbsp->dev, fck_src_name);
81         if (IS_ERR_OR_NULL(fck_src)) {
82                 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
83                        fck_src_name);
84                 return -EINVAL;
85         }
86
87         pm_runtime_put_sync(mcbsp->dev);
88
89         r = clk_set_parent(mcbsp->fclk, fck_src);
90         if (IS_ERR_VALUE(r)) {
91                 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
92                        "clks", fck_src_name);
93                 clk_put(fck_src);
94                 return -EINVAL;
95         }
96
97         pm_runtime_get_sync(mcbsp->dev);
98
99         clk_put(fck_src);
100
101         return 0;
102 }
103 EXPORT_SYMBOL(omap2_mcbsp_set_clks_src);
104
105 struct omap_device_pm_latency omap2_mcbsp_latency[] = {
106         {
107                 .deactivate_func = omap_device_idle_hwmods,
108                 .activate_func   = omap_device_enable_hwmods,
109                 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
110         },
111 };
112
113 static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
114 {
115         int id, count = 1;
116         char *name = "omap-mcbsp";
117         struct omap_hwmod *oh_device[2];
118         struct omap_mcbsp_platform_data *pdata = NULL;
119         struct omap_device *od;
120
121         sscanf(oh->name, "mcbsp%d", &id);
122
123         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
124         if (!pdata) {
125                 pr_err("%s: No memory for mcbsp\n", __func__);
126                 return -ENOMEM;
127         }
128
129         pdata->mcbsp_config_type = oh->class->rev;
130
131         if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
132                 if (id == 2)
133                         /* The FIFO has 1024 + 256 locations */
134                         pdata->buffer_size = 0x500;
135                 else
136                         /* The FIFO has 128 locations */
137                         pdata->buffer_size = 0x80;
138         }
139
140         oh_device[0] = oh;
141
142         if (oh->dev_attr) {
143                 oh_device[1] = omap_hwmod_lookup((
144                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
145                 count++;
146         }
147         od = omap_device_build_ss(name, id, oh_device, count, pdata,
148                                 sizeof(*pdata), omap2_mcbsp_latency,
149                                 ARRAY_SIZE(omap2_mcbsp_latency), false);
150         kfree(pdata);
151         if (IS_ERR(od))  {
152                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
153                                         name, oh->name);
154                 return PTR_ERR(od);
155         }
156         omap_mcbsp_count++;
157         return 0;
158 }
159
160 static int __init omap2_mcbsp_init(void)
161 {
162         omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
163
164         mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
165                                                                 GFP_KERNEL);
166         if (!mcbsp_ptr)
167                 return -ENOMEM;
168
169         return omap_mcbsp_init();
170 }
171 arch_initcall(omap2_mcbsp_init);