2 * linux/arch/arm/mach-omap2/mcbsp.c
4 * Copyright (C) 2008 Instituto Nokia de Tecnologia
5 * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
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.
11 * Multichannel mode not supported.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
21 #include <mach/irqs.h>
24 #include <plat/mcbsp.h>
25 #include <plat/omap_device.h>
26 #include <linux/pm_runtime.h>
31 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
32 * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
34 #include "cm2xxx_3xxx.h"
35 #include "cm-regbits-34xx.h"
37 /* McBSP internal signal muxing function */
38 static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
43 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
45 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;
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;
63 omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
68 /* McBSP CLKS source switching function */
69 static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
76 if (!strcmp(src, "clks_ext"))
77 fck_src_name = "pad_fck";
78 else if (!strcmp(src, "clks_fclk"))
79 fck_src_name = "prcm_fck";
83 fck_src = clk_get(dev, fck_src_name);
84 if (IS_ERR_OR_NULL(fck_src)) {
85 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
90 pm_runtime_put_sync(dev);
92 r = clk_set_parent(clk, fck_src);
93 if (IS_ERR_VALUE(r)) {
94 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
95 "clks", fck_src_name);
100 pm_runtime_get_sync(dev);
107 static int omap3_enable_st_clock(unsigned int id, bool enable)
112 * Sidetone uses McBSP ICLK - which must not idle when sidetones
113 * are enabled or sidetones start sounding ugly.
115 w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
117 w &= ~(1 << (id - 2));
120 omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
125 static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
128 char *name = "omap-mcbsp";
129 struct omap_hwmod *oh_device[2];
130 struct omap_mcbsp_platform_data *pdata = NULL;
131 struct platform_device *pdev;
133 sscanf(oh->name, "mcbsp%d", &id);
135 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
137 pr_err("%s: No memory for mcbsp\n", __func__);
142 if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
146 pdata->has_ccr = true;
148 pdata->set_clk_src = omap2_mcbsp_set_clk_src;
150 pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;
152 if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
154 /* The FIFO has 1024 + 256 locations */
155 pdata->buffer_size = 0x500;
157 /* The FIFO has 128 locations */
158 pdata->buffer_size = 0x80;
161 if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
162 pdata->has_wakeup = true;
167 oh_device[1] = omap_hwmod_lookup((
168 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
169 pdata->enable_st_clock = omap3_enable_st_clock;
172 pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
173 sizeof(*pdata), NULL, 0, false);
176 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
178 return PTR_ERR(pdev);
184 static int __init omap2_mcbsp_init(void)
186 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
188 mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
193 return omap_mcbsp_init();
195 arch_initcall(omap2_mcbsp_init);