]> git.kernelconcepts.de Git - karo-tx-linux.git/blob - arch/arm/mach-omap2/mcbsp.c
Merge branch 'stable/for-jens-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git...
[karo-tx-linux.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/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/slab.h>
21 #include <linux/platform_data/asoc-ti-mcbsp.h>
22 #include <linux/pm_runtime.h>
23
24 #include <linux/omap-dma.h>
25
26 #include "omap_device.h"
27
28 /*
29  * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
30  * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
31  */
32 #include "cm3xxx.h"
33 #include "cm-regbits-34xx.h"
34
35 static int omap3_enable_st_clock(unsigned int id, bool enable)
36 {
37         unsigned int w;
38
39         /*
40          * Sidetone uses McBSP ICLK - which must not idle when sidetones
41          * are enabled or sidetones start sounding ugly.
42          */
43         w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
44         if (enable)
45                 w &= ~(1 << (id - 2));
46         else
47                 w |= 1 << (id - 2);
48         omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
49
50         return 0;
51 }
52
53 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
54 {
55         int id, count = 1;
56         char *name = "omap-mcbsp";
57         struct omap_hwmod *oh_device[2];
58         struct omap_mcbsp_platform_data *pdata = NULL;
59         struct platform_device *pdev;
60
61         sscanf(oh->name, "mcbsp%d", &id);
62
63         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
64         if (!pdata) {
65                 pr_err("%s: No memory for mcbsp\n", __func__);
66                 return -ENOMEM;
67         }
68
69         pdata->reg_step = 4;
70         if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
71                 pdata->reg_size = 2;
72         } else {
73                 pdata->reg_size = 4;
74                 pdata->has_ccr = true;
75         }
76
77         if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
78                 /* The FIFO has 128 locations */
79                 pdata->buffer_size = 0x80;
80         } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
81                 if (id == 2)
82                         /* The FIFO has 1024 + 256 locations */
83                         pdata->buffer_size = 0x500;
84                 else
85                         /* The FIFO has 128 locations */
86                         pdata->buffer_size = 0x80;
87         } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
88                 /* The FIFO has 128 locations for all instances */
89                 pdata->buffer_size = 0x80;
90         }
91
92         if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
93                 pdata->has_wakeup = true;
94
95         oh_device[0] = oh;
96
97         if (oh->dev_attr) {
98                 oh_device[1] = omap_hwmod_lookup((
99                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
100                 pdata->enable_st_clock = omap3_enable_st_clock;
101                 count++;
102         }
103         pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
104                                 sizeof(*pdata), NULL, 0, false);
105         kfree(pdata);
106         if (IS_ERR(pdev))  {
107                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
108                                         name, oh->name);
109                 return PTR_ERR(pdev);
110         }
111         return 0;
112 }
113
114 static int __init omap2_mcbsp_init(void)
115 {
116         if (!of_have_populated_dt())
117                 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
118
119         return 0;
120 }
121 arch_initcall(omap2_mcbsp_init);