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 /* McBSP1 internal signal muxing function for OMAP2/3 */
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 /* McBSP4 internal signal muxing function for OMAP4 */
69 #define OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX (1 << 31)
70 #define OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX (1 << 30)
71 static int omap4_mcbsp4_mux_rx_clk(struct device *dev, const char *signal,
77 * In CONTROL_MCBSPLP register only bit 30 (CLKR mux), and bit 31 (FSR
79 v = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MCBSPLP);
81 if (!strcmp(signal, "clkr")) {
82 if (!strcmp(src, "clkr"))
83 v &= ~OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX;
84 else if (!strcmp(src, "clkx"))
85 v |= OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX;
88 } else if (!strcmp(signal, "fsr")) {
89 if (!strcmp(src, "fsr"))
90 v &= ~OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX;
91 else if (!strcmp(src, "fsx"))
92 v |= OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX;
99 omap4_ctrl_pad_writel(v, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MCBSPLP);
104 /* McBSP CLKS source switching function */
105 static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
112 if (!strcmp(src, "clks_ext"))
113 fck_src_name = "pad_fck";
114 else if (!strcmp(src, "clks_fclk"))
115 fck_src_name = "prcm_fck";
119 fck_src = clk_get(dev, fck_src_name);
120 if (IS_ERR_OR_NULL(fck_src)) {
121 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
126 pm_runtime_put_sync(dev);
128 r = clk_set_parent(clk, fck_src);
129 if (IS_ERR_VALUE(r)) {
130 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
131 "clks", fck_src_name);
136 pm_runtime_get_sync(dev);
143 static int omap3_enable_st_clock(unsigned int id, bool enable)
148 * Sidetone uses McBSP ICLK - which must not idle when sidetones
149 * are enabled or sidetones start sounding ugly.
151 w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
153 w &= ~(1 << (id - 2));
156 omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
161 static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
164 char *name = "omap-mcbsp";
165 struct omap_hwmod *oh_device[2];
166 struct omap_mcbsp_platform_data *pdata = NULL;
167 struct platform_device *pdev;
169 sscanf(oh->name, "mcbsp%d", &id);
171 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
173 pr_err("%s: No memory for mcbsp\n", __func__);
178 if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
182 pdata->has_ccr = true;
184 pdata->set_clk_src = omap2_mcbsp_set_clk_src;
186 /* On OMAP2/3 the McBSP1 port has 6 pin configuration */
187 if (id == 1 && oh->class->rev < MCBSP_CONFIG_TYPE4)
188 pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;
190 /* On OMAP4 the McBSP4 port has 6 pin configuration */
191 if (id == 4 && oh->class->rev == MCBSP_CONFIG_TYPE4)
192 pdata->mux_signal = omap4_mcbsp4_mux_rx_clk;
194 if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
196 /* The FIFO has 1024 + 256 locations */
197 pdata->buffer_size = 0x500;
199 /* The FIFO has 128 locations */
200 pdata->buffer_size = 0x80;
201 } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
202 /* The FIFO has 128 locations for all instances */
203 pdata->buffer_size = 0x80;
206 if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
207 pdata->has_wakeup = true;
212 oh_device[1] = omap_hwmod_lookup((
213 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
214 pdata->enable_st_clock = omap3_enable_st_clock;
217 pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
218 sizeof(*pdata), NULL, 0, false);
221 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
223 return PTR_ERR(pdev);
228 static int __init omap2_mcbsp_init(void)
230 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
234 arch_initcall(omap2_mcbsp_init);