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
37static struct clk *mcbsp_iclks[5];
38
39static 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
51static 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
115static 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}
122omap_arch_initcall(omap2_mcbsp_init);
123