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 "soc.h"
27 #include "omap_device.h"
28 #include "clock.h"
29
30 /*
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 "cm3xxx.h"
35 #include "cm-regbits-34xx.h"
36
37 static struct clk *mcbsp_iclks[5];
38
omap3_enable_st_clock(unsigned int id,bool enable)39 static int omap3_enable_st_clock(unsigned int id, bool enable)
40 {
41 /*
42 * Sidetone uses McBSP ICLK - which must not idle when sidetones
43 * are enabled or sidetones start sounding ugly.
44 */
45 if (enable)
46 return omap2_clk_deny_idle(mcbsp_iclks[id]);
47 else
48 return omap2_clk_allow_idle(mcbsp_iclks[id]);
49 }
50
omap_init_mcbsp(struct omap_hwmod * oh,void * unused)51 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
52 {
53 int id, count = 1;
54 char *name = "omap-mcbsp";
55 struct omap_hwmod *oh_device[2];
56 struct omap_mcbsp_platform_data *pdata = NULL;
57 struct platform_device *pdev;
58 char clk_name[11];
59
60 sscanf(oh->name, "mcbsp%d", &id);
61
62 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
63 if (!pdata) {
64 pr_err("%s: No memory for mcbsp\n", __func__);
65 return -ENOMEM;
66 }
67
68 pdata->reg_step = 4;
69 if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
70 pdata->reg_size = 2;
71 } else {
72 pdata->reg_size = 4;
73 pdata->has_ccr = true;
74 }
75
76 if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
77 /* The FIFO has 128 locations */
78 pdata->buffer_size = 0x80;
79 } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
80 if (id == 2)
81 /* The FIFO has 1024 + 256 locations */
82 pdata->buffer_size = 0x500;
83 else
84 /* The FIFO has 128 locations */
85 pdata->buffer_size = 0x80;
86 } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
87 /* The FIFO has 128 locations for all instances */
88 pdata->buffer_size = 0x80;
89 }
90
91 if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
92 pdata->has_wakeup = true;
93
94 oh_device[0] = oh;
95
96 if (oh->dev_attr) {
97 oh_device[1] = omap_hwmod_lookup((
98 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
99 pdata->enable_st_clock = omap3_enable_st_clock;
100 sprintf(clk_name, "mcbsp%d_ick", id);
101 mcbsp_iclks[id] = clk_get(NULL, clk_name);
102 count++;
103 }
104 pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
105 sizeof(*pdata));
106 kfree(pdata);
107 if (IS_ERR(pdev)) {
108 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
109 name, oh->name);
110 return PTR_ERR(pdev);
111 }
112 return 0;
113 }
114
omap2_mcbsp_init(void)115 static int __init omap2_mcbsp_init(void)
116 {
117 if (!of_have_populated_dt())
118 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
119
120 return 0;
121 }
122 omap_arch_initcall(omap2_mcbsp_init);
123