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/*
* linux/arch/arm/mach-omap2/mcbsp.c
*
* Copyright (C) 2008 Instituto Nokia de Tecnologia
* Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Multichannel mode not supported.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <mach/irqs.h>
#include <plat/dma.h>
#include <plat/cpu.h>
#include <plat/mcbsp.h>
#include <plat/omap_device.h>
#include <linux/pm_runtime.h>
#include "control.h"
/*
* FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
* Sidetone needs non-gated ICLK and sidetone autoidle is broken.
*/
#include "cm2xxx_3xxx.h"
#include "cm-regbits-34xx.h"
/* McBSP internal signal muxing function */
static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
const char *src)
{
u32 v;
v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
if (!strcmp(signal, "clkr")) {
if (!strcmp(src, "clkr"))
v &= ~OMAP2_MCBSP1_CLKR_MASK;
else if (!strcmp(src, "clkx"))
v |= OMAP2_MCBSP1_CLKR_MASK;
else
return -EINVAL;
} else if (!strcmp(signal, "fsr")) {
if (!strcmp(src, "fsr"))
v &= ~OMAP2_MCBSP1_FSR_MASK;
else if (!strcmp(src, "fsx"))
v |= OMAP2_MCBSP1_FSR_MASK;
else
return -EINVAL;
} else {
return -EINVAL;
}
omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
return 0;
}
/* McBSP CLKS source switching function */
static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
const char *src)
{
struct clk *fck_src;
char *fck_src_name;
int r;
if (!strcmp(src, "clks_ext"))
fck_src_name = "pad_fck";
else if (!strcmp(src, "clks_fclk"))
fck_src_name = "prcm_fck";
else
return -EINVAL;
fck_src = clk_get(dev, fck_src_name);
if (IS_ERR_OR_NULL(fck_src)) {
pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
fck_src_name);
return -EINVAL;
}
pm_runtime_put_sync(dev);
r = clk_set_parent(clk, fck_src);
if (IS_ERR_VALUE(r)) {
pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
"clks", fck_src_name);
clk_put(fck_src);
return -EINVAL;
}
pm_runtime_get_sync(dev);
clk_put(fck_src);
return 0;
}
static int omap3_enable_st_clock(unsigned int id, bool enable)
{
unsigned int w;
/*
* Sidetone uses McBSP ICLK - which must not idle when sidetones
* are enabled or sidetones start sounding ugly.
*/
w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
if (enable)
w &= ~(1 << (id - 2));
else
w |= 1 << (id - 2);
omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
return 0;
}
static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
{
int id, count = 1;
char *name = "omap-mcbsp";
struct omap_hwmod *oh_device[2];
struct omap_mcbsp_platform_data *pdata = NULL;
struct platform_device *pdev;
sscanf(oh->name, "mcbsp%d", &id);
pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
if (!pdata) {
pr_err("%s: No memory for mcbsp\n", __func__);
return -ENOMEM;
}
pdata->reg_step = 4;
if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
pdata->reg_size = 2;
} else {
pdata->reg_size = 4;
pdata->has_ccr = true;
}
if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
if (id == 2)
/* The FIFO has 1024 + 256 locations */
pdata->buffer_size = 0x500;
else
/* The FIFO has 128 locations */
pdata->buffer_size = 0x80;
}
if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
pdata->has_wakeup = true;
oh_device[0] = oh;
if (oh->dev_attr) {
oh_device[1] = omap_hwmod_lookup((
(struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
pdata->enable_st_clock = omap3_enable_st_clock;
count++;
}
pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
sizeof(*pdata), NULL, 0, false);
kfree(pdata);
if (IS_ERR(pdev)) {
pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
name, oh->name);
return PTR_ERR(pdev);
}
pdata->set_clk_src = omap2_mcbsp_set_clk_src;
if (id == 1)
pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;
omap_mcbsp_count++;
return 0;
}
static int __init omap2_mcbsp_init(void)
{
omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
GFP_KERNEL);
if (!mcbsp_ptr)
return -ENOMEM;
return omap_mcbsp_init();
}
arch_initcall(omap2_mcbsp_init);
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