linux/arch/arm/mach-omap2/mcbsp.c
Kishon Vijay Abraham I 9504ba64f0 OMAP: McBSP: APIs to pass DMA params from McBSP driver to client drivers
After McBSP driver is hwmod adapted, the information about the hw would be
obtained from the hwmod database by the mcbsp driver. Since DMA programming is
handled by the client driver, APIs are provided to pass the DMA channel number
and base address of data register required by the client driver for DMA
programming.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Charulatha V <charu@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2011-02-24 13:03:52 -08:00

172 lines
4.0 KiB
C

/*
* 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"
/* McBSP internal signal muxing functions */
void omap2_mcbsp1_mux_clkr_src(u8 mux)
{
u32 v;
v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
if (mux == CLKR_SRC_CLKR)
v &= ~OMAP2_MCBSP1_CLKR_MASK;
else if (mux == CLKR_SRC_CLKX)
v |= OMAP2_MCBSP1_CLKR_MASK;
omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
}
EXPORT_SYMBOL(omap2_mcbsp1_mux_clkr_src);
void omap2_mcbsp1_mux_fsr_src(u8 mux)
{
u32 v;
v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
if (mux == FSR_SRC_FSR)
v &= ~OMAP2_MCBSP1_FSR_MASK;
else if (mux == FSR_SRC_FSX)
v |= OMAP2_MCBSP1_FSR_MASK;
omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
}
EXPORT_SYMBOL(omap2_mcbsp1_mux_fsr_src);
/* McBSP CLKS source switching function */
int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
{
struct omap_mcbsp *mcbsp;
struct clk *fck_src;
char *fck_src_name;
int r;
if (!omap_mcbsp_check_valid_id(id)) {
pr_err("%s: Invalid id (%d)\n", __func__, id + 1);
return -EINVAL;
}
mcbsp = id_to_mcbsp_ptr(id);
if (fck_src_id == MCBSP_CLKS_PAD_SRC)
fck_src_name = "pad_fck";
else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
fck_src_name = "prcm_fck";
else
return -EINVAL;
fck_src = clk_get(mcbsp->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(mcbsp->dev);
r = clk_set_parent(mcbsp->fclk, 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(mcbsp->dev);
clk_put(fck_src);
return 0;
}
EXPORT_SYMBOL(omap2_mcbsp_set_clks_src);
struct omap_device_pm_latency omap2_mcbsp_latency[] = {
{
.deactivate_func = omap_device_idle_hwmods,
.activate_func = omap_device_enable_hwmods,
.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
},
};
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 omap_device *od;
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->mcbsp_config_type = oh->class->rev;
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;
}
oh_device[0] = oh;
if (oh->dev_attr) {
oh_device[1] = omap_hwmod_lookup((
(struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
count++;
}
od = omap_device_build_ss(name, id, oh_device, count, pdata,
sizeof(*pdata), omap2_mcbsp_latency,
ARRAY_SIZE(omap2_mcbsp_latency), false);
kfree(pdata);
if (IS_ERR(od)) {
pr_err("%s: Cant build omap_device for %s:%s.\n", __func__,
name, oh->name);
return PTR_ERR(od);
}
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);