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7a90da2ad3
McBSP driver require special hacks to enable/disable the autoidle feature for its interface clock for the proper function of the sidetone hardware. Currently the driver just writes CM registers directly, which should be avoided. Thus, changed the driver to use the new deny/allow_autoidle clock API calls. Signed-off-by: Tero Kristo <t-kristo@ti.com> Cc: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Paul Walmsley <paul@pwsan.com>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* linux/arch/arm/mach-omap2/mcbsp.c
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*
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* Copyright (C) 2008 Instituto Nokia de Tecnologia
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* Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Multichannel mode not supported.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/platform_data/asoc-ti-mcbsp.h>
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#include <linux/pm_runtime.h>
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#include <linux/omap-dma.h>
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#include "soc.h"
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#include "omap_device.h"
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#include "clock.h"
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/*
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* FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
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* Sidetone needs non-gated ICLK and sidetone autoidle is broken.
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*/
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#include "cm3xxx.h"
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#include "cm-regbits-34xx.h"
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static struct clk *mcbsp_iclks[5];
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static int omap3_enable_st_clock(unsigned int id, bool enable)
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{
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/*
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* Sidetone uses McBSP ICLK - which must not idle when sidetones
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* are enabled or sidetones start sounding ugly.
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*/
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if (enable)
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return omap2_clk_deny_idle(mcbsp_iclks[id]);
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else
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return omap2_clk_allow_idle(mcbsp_iclks[id]);
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}
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static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
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{
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int id, count = 1;
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char *name = "omap-mcbsp";
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struct omap_hwmod *oh_device[2];
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struct omap_mcbsp_platform_data *pdata = NULL;
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struct platform_device *pdev;
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char clk_name[11];
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sscanf(oh->name, "mcbsp%d", &id);
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pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
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if (!pdata) {
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pr_err("%s: No memory for mcbsp\n", __func__);
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return -ENOMEM;
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}
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pdata->reg_step = 4;
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if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
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pdata->reg_size = 2;
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} else {
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pdata->reg_size = 4;
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pdata->has_ccr = true;
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}
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if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
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/* The FIFO has 128 locations */
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pdata->buffer_size = 0x80;
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} else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
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if (id == 2)
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/* The FIFO has 1024 + 256 locations */
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pdata->buffer_size = 0x500;
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else
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/* The FIFO has 128 locations */
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pdata->buffer_size = 0x80;
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} else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
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/* The FIFO has 128 locations for all instances */
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pdata->buffer_size = 0x80;
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}
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if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
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pdata->has_wakeup = true;
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oh_device[0] = oh;
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if (oh->dev_attr) {
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oh_device[1] = omap_hwmod_lookup((
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(struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
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pdata->enable_st_clock = omap3_enable_st_clock;
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sprintf(clk_name, "mcbsp%d_ick", id);
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mcbsp_iclks[id] = clk_get(NULL, clk_name);
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count++;
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}
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pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
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sizeof(*pdata));
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kfree(pdata);
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if (IS_ERR(pdev)) {
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pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
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name, oh->name);
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return PTR_ERR(pdev);
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}
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return 0;
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}
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static int __init omap2_mcbsp_init(void)
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{
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if (!of_have_populated_dt())
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omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
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return 0;
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}
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omap_arch_initcall(omap2_mcbsp_init);
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