471 lines
11 KiB
C
471 lines
11 KiB
C
/*
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* mcpdm.c -- McPDM interface driver
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*
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* Author: Jorge Eduardo Candelaria <x0107209@ti.com>
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* Copyright (C) 2009 - Texas Instruments, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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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/device.h>
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#include <linux/platform_device.h>
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include "mcpdm.h"
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static struct omap_mcpdm *mcpdm;
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static inline void omap_mcpdm_write(u16 reg, u32 val)
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{
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__raw_writel(val, mcpdm->io_base + reg);
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}
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static inline int omap_mcpdm_read(u16 reg)
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{
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return __raw_readl(mcpdm->io_base + reg);
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}
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static void omap_mcpdm_reg_dump(void)
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{
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dev_dbg(mcpdm->dev, "***********************\n");
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dev_dbg(mcpdm->dev, "IRQSTATUS_RAW: 0x%04x\n",
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omap_mcpdm_read(MCPDM_IRQSTATUS_RAW));
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dev_dbg(mcpdm->dev, "IRQSTATUS: 0x%04x\n",
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omap_mcpdm_read(MCPDM_IRQSTATUS));
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dev_dbg(mcpdm->dev, "IRQENABLE_SET: 0x%04x\n",
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omap_mcpdm_read(MCPDM_IRQENABLE_SET));
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dev_dbg(mcpdm->dev, "IRQENABLE_CLR: 0x%04x\n",
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omap_mcpdm_read(MCPDM_IRQENABLE_CLR));
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dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
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omap_mcpdm_read(MCPDM_IRQWAKE_EN));
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dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
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omap_mcpdm_read(MCPDM_DMAENABLE_SET));
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dev_dbg(mcpdm->dev, "DMAENABLE_CLR: 0x%04x\n",
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omap_mcpdm_read(MCPDM_DMAENABLE_CLR));
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dev_dbg(mcpdm->dev, "DMAWAKEEN: 0x%04x\n",
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omap_mcpdm_read(MCPDM_DMAWAKEEN));
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dev_dbg(mcpdm->dev, "CTRL: 0x%04x\n",
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omap_mcpdm_read(MCPDM_CTRL));
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dev_dbg(mcpdm->dev, "DN_DATA: 0x%04x\n",
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omap_mcpdm_read(MCPDM_DN_DATA));
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dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
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omap_mcpdm_read(MCPDM_UP_DATA));
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dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
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omap_mcpdm_read(MCPDM_FIFO_CTRL_DN));
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dev_dbg(mcpdm->dev, "FIFO_CTRL_UP: 0x%04x\n",
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omap_mcpdm_read(MCPDM_FIFO_CTRL_UP));
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dev_dbg(mcpdm->dev, "DN_OFFSET: 0x%04x\n",
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omap_mcpdm_read(MCPDM_DN_OFFSET));
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dev_dbg(mcpdm->dev, "***********************\n");
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}
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/*
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* Takes the McPDM module in and out of reset state.
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* Uplink and downlink can be reset individually.
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*/
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static void omap_mcpdm_reset_capture(int reset)
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{
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int ctrl = omap_mcpdm_read(MCPDM_CTRL);
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if (reset)
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ctrl |= SW_UP_RST;
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else
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ctrl &= ~SW_UP_RST;
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omap_mcpdm_write(MCPDM_CTRL, ctrl);
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}
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static void omap_mcpdm_reset_playback(int reset)
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{
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int ctrl = omap_mcpdm_read(MCPDM_CTRL);
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if (reset)
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ctrl |= SW_DN_RST;
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else
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ctrl &= ~SW_DN_RST;
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omap_mcpdm_write(MCPDM_CTRL, ctrl);
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}
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/*
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* Enables the transfer through the PDM interface to/from the Phoenix
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* codec by enabling the corresponding UP or DN channels.
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*/
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void omap_mcpdm_start(int stream)
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{
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int ctrl = omap_mcpdm_read(MCPDM_CTRL);
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if (stream)
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ctrl |= mcpdm->up_channels;
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else
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ctrl |= mcpdm->dn_channels;
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omap_mcpdm_write(MCPDM_CTRL, ctrl);
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}
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/*
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* Disables the transfer through the PDM interface to/from the Phoenix
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* codec by disabling the corresponding UP or DN channels.
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*/
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void omap_mcpdm_stop(int stream)
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{
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int ctrl = omap_mcpdm_read(MCPDM_CTRL);
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if (stream)
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ctrl &= ~mcpdm->up_channels;
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else
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ctrl &= ~mcpdm->dn_channels;
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omap_mcpdm_write(MCPDM_CTRL, ctrl);
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}
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/*
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* Configures McPDM uplink for audio recording.
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* This function should be called before omap_mcpdm_start.
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*/
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int omap_mcpdm_capture_open(struct omap_mcpdm_link *uplink)
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{
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int irq_mask = 0;
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int ctrl;
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if (!uplink)
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return -EINVAL;
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mcpdm->uplink = uplink;
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/* Enable irq request generation */
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irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
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omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);
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/* Configure uplink threshold */
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if (uplink->threshold > UP_THRES_MAX)
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uplink->threshold = UP_THRES_MAX;
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omap_mcpdm_write(MCPDM_FIFO_CTRL_UP, uplink->threshold);
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/* Configure DMA controller */
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omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_UP_ENABLE);
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/* Set pdm out format */
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ctrl = omap_mcpdm_read(MCPDM_CTRL);
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ctrl &= ~PDMOUTFORMAT;
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ctrl |= uplink->format & PDMOUTFORMAT;
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/* Uplink channels */
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mcpdm->up_channels = uplink->channels & (PDM_UP_MASK | PDM_STATUS_MASK);
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omap_mcpdm_write(MCPDM_CTRL, ctrl);
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return 0;
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}
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/*
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* Configures McPDM downlink for audio playback.
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* This function should be called before omap_mcpdm_start.
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*/
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int omap_mcpdm_playback_open(struct omap_mcpdm_link *downlink)
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{
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int irq_mask = 0;
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int ctrl;
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if (!downlink)
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return -EINVAL;
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mcpdm->downlink = downlink;
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/* Enable irq request generation */
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irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
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omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);
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/* Configure uplink threshold */
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if (downlink->threshold > DN_THRES_MAX)
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downlink->threshold = DN_THRES_MAX;
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omap_mcpdm_write(MCPDM_FIFO_CTRL_DN, downlink->threshold);
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/* Enable DMA request generation */
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omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_DN_ENABLE);
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/* Set pdm out format */
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ctrl = omap_mcpdm_read(MCPDM_CTRL);
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ctrl &= ~PDMOUTFORMAT;
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ctrl |= downlink->format & PDMOUTFORMAT;
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/* Downlink channels */
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mcpdm->dn_channels = downlink->channels & (PDM_DN_MASK | PDM_CMD_MASK);
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omap_mcpdm_write(MCPDM_CTRL, ctrl);
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return 0;
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}
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/*
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* Cleans McPDM uplink configuration.
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* This function should be called when the stream is closed.
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*/
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int omap_mcpdm_capture_close(struct omap_mcpdm_link *uplink)
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{
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int irq_mask = 0;
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if (!uplink)
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return -EINVAL;
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/* Disable irq request generation */
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irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
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omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);
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/* Disable DMA request generation */
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omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_UP_ENABLE);
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/* Clear Downlink channels */
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mcpdm->up_channels = 0;
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mcpdm->uplink = NULL;
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return 0;
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}
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/*
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* Cleans McPDM downlink configuration.
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* This function should be called when the stream is closed.
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*/
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int omap_mcpdm_playback_close(struct omap_mcpdm_link *downlink)
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{
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int irq_mask = 0;
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if (!downlink)
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return -EINVAL;
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/* Disable irq request generation */
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irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
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omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);
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/* Disable DMA request generation */
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omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_DN_ENABLE);
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/* clear Downlink channels */
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mcpdm->dn_channels = 0;
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mcpdm->downlink = NULL;
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return 0;
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}
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static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
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{
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struct omap_mcpdm *mcpdm_irq = dev_id;
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int irq_status;
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irq_status = omap_mcpdm_read(MCPDM_IRQSTATUS);
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/* Acknowledge irq event */
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omap_mcpdm_write(MCPDM_IRQSTATUS, irq_status);
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if (irq & MCPDM_DN_IRQ_FULL) {
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dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
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omap_mcpdm_reset_playback(1);
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omap_mcpdm_playback_open(mcpdm_irq->downlink);
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omap_mcpdm_reset_playback(0);
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}
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if (irq & MCPDM_DN_IRQ_EMPTY) {
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dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
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omap_mcpdm_reset_playback(1);
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omap_mcpdm_playback_open(mcpdm_irq->downlink);
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omap_mcpdm_reset_playback(0);
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}
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if (irq & MCPDM_DN_IRQ) {
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dev_dbg(mcpdm_irq->dev, "DN write request\n");
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}
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if (irq & MCPDM_UP_IRQ_FULL) {
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dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
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omap_mcpdm_reset_capture(1);
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omap_mcpdm_capture_open(mcpdm_irq->uplink);
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omap_mcpdm_reset_capture(0);
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}
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if (irq & MCPDM_UP_IRQ_EMPTY) {
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dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
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omap_mcpdm_reset_capture(1);
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omap_mcpdm_capture_open(mcpdm_irq->uplink);
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omap_mcpdm_reset_capture(0);
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}
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if (irq & MCPDM_UP_IRQ) {
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dev_dbg(mcpdm_irq->dev, "UP write request\n");
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}
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return IRQ_HANDLED;
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}
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int omap_mcpdm_request(void)
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{
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int ret;
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clk_enable(mcpdm->clk);
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spin_lock(&mcpdm->lock);
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if (!mcpdm->free) {
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dev_err(mcpdm->dev, "McPDM interface is in use\n");
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spin_unlock(&mcpdm->lock);
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ret = -EBUSY;
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goto err;
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}
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mcpdm->free = 0;
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spin_unlock(&mcpdm->lock);
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/* Disable lines while request is ongoing */
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omap_mcpdm_write(MCPDM_CTRL, 0x00);
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ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler,
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0, "McPDM", (void *)mcpdm);
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if (ret) {
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dev_err(mcpdm->dev, "Request for McPDM IRQ failed\n");
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goto err;
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}
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return 0;
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err:
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clk_disable(mcpdm->clk);
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return ret;
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}
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void omap_mcpdm_free(void)
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{
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spin_lock(&mcpdm->lock);
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if (mcpdm->free) {
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dev_err(mcpdm->dev, "McPDM interface is already free\n");
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spin_unlock(&mcpdm->lock);
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return;
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}
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mcpdm->free = 1;
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spin_unlock(&mcpdm->lock);
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clk_disable(mcpdm->clk);
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free_irq(mcpdm->irq, (void *)mcpdm);
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}
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/* Enable/disable DC offset cancelation for the analog
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* headset path (PDM channels 1 and 2).
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*/
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int omap_mcpdm_set_offset(int offset1, int offset2)
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{
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int offset;
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if ((offset1 > DN_OFST_MAX) || (offset2 > DN_OFST_MAX))
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return -EINVAL;
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offset = (offset1 << DN_OFST_RX1) | (offset2 << DN_OFST_RX2);
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/* offset cancellation for channel 1 */
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if (offset1)
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offset |= DN_OFST_RX1_EN;
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else
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offset &= ~DN_OFST_RX1_EN;
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/* offset cancellation for channel 2 */
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if (offset2)
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offset |= DN_OFST_RX2_EN;
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else
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offset &= ~DN_OFST_RX2_EN;
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omap_mcpdm_write(MCPDM_DN_OFFSET, offset);
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return 0;
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}
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int __devinit omap_mcpdm_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int ret = 0;
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mcpdm = kzalloc(sizeof(struct omap_mcpdm), GFP_KERNEL);
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if (!mcpdm) {
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ret = -ENOMEM;
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goto exit;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "no resource\n");
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goto err_resource;
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}
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spin_lock_init(&mcpdm->lock);
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mcpdm->free = 1;
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mcpdm->io_base = ioremap(res->start, resource_size(res));
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if (!mcpdm->io_base) {
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ret = -ENOMEM;
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goto err_resource;
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}
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mcpdm->irq = platform_get_irq(pdev, 0);
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mcpdm->clk = clk_get(&pdev->dev, "pdm_ck");
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if (IS_ERR(mcpdm->clk)) {
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ret = PTR_ERR(mcpdm->clk);
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dev_err(&pdev->dev, "unable to get pdm_ck: %d\n", ret);
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goto err_clk;
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}
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mcpdm->dev = &pdev->dev;
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platform_set_drvdata(pdev, mcpdm);
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return 0;
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err_clk:
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iounmap(mcpdm->io_base);
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err_resource:
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kfree(mcpdm);
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exit:
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return ret;
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}
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int __devexit omap_mcpdm_remove(struct platform_device *pdev)
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{
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struct omap_mcpdm *mcpdm_ptr = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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clk_put(mcpdm_ptr->clk);
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iounmap(mcpdm_ptr->io_base);
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mcpdm_ptr->clk = NULL;
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mcpdm_ptr->free = 0;
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mcpdm_ptr->dev = NULL;
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kfree(mcpdm_ptr);
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return 0;
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}
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