430 строки
10 KiB
C
430 строки
10 KiB
C
/*
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* bf6xx_sport.c Analog Devices BF6XX SPORT driver
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*
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* Copyright (c) 2012 Analog Devices Inc.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <asm/blackfin.h>
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#include <asm/dma.h>
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#include <asm/portmux.h>
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#include "bf6xx-sport.h"
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int sport_set_tx_params(struct sport_device *sport,
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struct sport_params *params)
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{
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if (sport->tx_regs->spctl & SPORT_CTL_SPENPRI)
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return -EBUSY;
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sport->tx_regs->spctl = params->spctl | SPORT_CTL_SPTRAN;
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sport->tx_regs->div = params->div;
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SSYNC();
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return 0;
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}
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EXPORT_SYMBOL(sport_set_tx_params);
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int sport_set_rx_params(struct sport_device *sport,
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struct sport_params *params)
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{
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if (sport->rx_regs->spctl & SPORT_CTL_SPENPRI)
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return -EBUSY;
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sport->rx_regs->spctl = params->spctl & ~SPORT_CTL_SPTRAN;
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sport->rx_regs->div = params->div;
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SSYNC();
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return 0;
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}
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EXPORT_SYMBOL(sport_set_rx_params);
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static int compute_wdsize(size_t wdsize)
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{
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switch (wdsize) {
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case 1:
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return WDSIZE_8 | PSIZE_8;
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case 2:
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return WDSIZE_16 | PSIZE_16;
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default:
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return WDSIZE_32 | PSIZE_32;
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}
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}
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void sport_tx_start(struct sport_device *sport)
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{
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set_dma_next_desc_addr(sport->tx_dma_chan, sport->tx_desc);
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set_dma_config(sport->tx_dma_chan, DMAFLOW_LIST | DI_EN
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| compute_wdsize(sport->wdsize) | NDSIZE_6);
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enable_dma(sport->tx_dma_chan);
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sport->tx_regs->spctl |= SPORT_CTL_SPENPRI;
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SSYNC();
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}
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EXPORT_SYMBOL(sport_tx_start);
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void sport_rx_start(struct sport_device *sport)
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{
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set_dma_next_desc_addr(sport->rx_dma_chan, sport->rx_desc);
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set_dma_config(sport->rx_dma_chan, DMAFLOW_LIST | DI_EN | WNR
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| compute_wdsize(sport->wdsize) | NDSIZE_6);
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enable_dma(sport->rx_dma_chan);
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sport->rx_regs->spctl |= SPORT_CTL_SPENPRI;
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SSYNC();
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}
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EXPORT_SYMBOL(sport_rx_start);
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void sport_tx_stop(struct sport_device *sport)
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{
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sport->tx_regs->spctl &= ~SPORT_CTL_SPENPRI;
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SSYNC();
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disable_dma(sport->tx_dma_chan);
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}
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EXPORT_SYMBOL(sport_tx_stop);
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void sport_rx_stop(struct sport_device *sport)
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{
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sport->rx_regs->spctl &= ~SPORT_CTL_SPENPRI;
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SSYNC();
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disable_dma(sport->rx_dma_chan);
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}
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EXPORT_SYMBOL(sport_rx_stop);
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void sport_set_tx_callback(struct sport_device *sport,
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void (*tx_callback)(void *), void *tx_data)
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{
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sport->tx_callback = tx_callback;
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sport->tx_data = tx_data;
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}
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EXPORT_SYMBOL(sport_set_tx_callback);
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void sport_set_rx_callback(struct sport_device *sport,
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void (*rx_callback)(void *), void *rx_data)
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{
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sport->rx_callback = rx_callback;
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sport->rx_data = rx_data;
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}
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EXPORT_SYMBOL(sport_set_rx_callback);
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static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
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size_t fragsize, unsigned int cfg,
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unsigned int count, size_t wdsize)
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{
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int i;
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for (i = 0; i < fragcount; ++i) {
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desc[i].next_desc_addr = &(desc[i + 1]);
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desc[i].start_addr = (unsigned long)buf + i*fragsize;
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desc[i].cfg = cfg;
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desc[i].x_count = count;
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desc[i].x_modify = wdsize;
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desc[i].y_count = 0;
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desc[i].y_modify = 0;
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}
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/* make circular */
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desc[fragcount-1].next_desc_addr = desc;
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}
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int sport_config_tx_dma(struct sport_device *sport, void *buf,
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int fragcount, size_t fragsize)
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{
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unsigned int count;
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unsigned int cfg;
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dma_addr_t addr;
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count = fragsize/sport->wdsize;
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if (sport->tx_desc)
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dma_free_coherent(NULL, sport->tx_desc_size,
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sport->tx_desc, 0);
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sport->tx_desc = dma_alloc_coherent(NULL,
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fragcount * sizeof(struct dmasg), &addr, 0);
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sport->tx_desc_size = fragcount * sizeof(struct dmasg);
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if (!sport->tx_desc)
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return -ENOMEM;
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sport->tx_buf = buf;
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sport->tx_fragsize = fragsize;
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sport->tx_frags = fragcount;
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cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | NDSIZE_6;
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setup_desc(sport->tx_desc, buf, fragcount, fragsize,
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cfg|DMAEN, count, sport->wdsize);
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return 0;
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}
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EXPORT_SYMBOL(sport_config_tx_dma);
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int sport_config_rx_dma(struct sport_device *sport, void *buf,
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int fragcount, size_t fragsize)
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{
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unsigned int count;
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unsigned int cfg;
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dma_addr_t addr;
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count = fragsize/sport->wdsize;
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if (sport->rx_desc)
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dma_free_coherent(NULL, sport->rx_desc_size,
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sport->rx_desc, 0);
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sport->rx_desc = dma_alloc_coherent(NULL,
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fragcount * sizeof(struct dmasg), &addr, 0);
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sport->rx_desc_size = fragcount * sizeof(struct dmasg);
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if (!sport->rx_desc)
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return -ENOMEM;
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sport->rx_buf = buf;
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sport->rx_fragsize = fragsize;
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sport->rx_frags = fragcount;
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cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
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| WNR | NDSIZE_6;
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setup_desc(sport->rx_desc, buf, fragcount, fragsize,
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cfg|DMAEN, count, sport->wdsize);
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return 0;
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}
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EXPORT_SYMBOL(sport_config_rx_dma);
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unsigned long sport_curr_offset_tx(struct sport_device *sport)
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{
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unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
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return (unsigned char *)curr - sport->tx_buf;
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}
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EXPORT_SYMBOL(sport_curr_offset_tx);
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unsigned long sport_curr_offset_rx(struct sport_device *sport)
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{
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unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
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return (unsigned char *)curr - sport->rx_buf;
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}
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EXPORT_SYMBOL(sport_curr_offset_rx);
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static irqreturn_t sport_tx_irq(int irq, void *dev_id)
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{
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struct sport_device *sport = dev_id;
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static unsigned long status;
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status = get_dma_curr_irqstat(sport->tx_dma_chan);
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if (status & (DMA_DONE|DMA_ERR)) {
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clear_dma_irqstat(sport->tx_dma_chan);
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SSYNC();
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}
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if (sport->tx_callback)
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sport->tx_callback(sport->tx_data);
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return IRQ_HANDLED;
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}
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static irqreturn_t sport_rx_irq(int irq, void *dev_id)
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{
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struct sport_device *sport = dev_id;
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unsigned long status;
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status = get_dma_curr_irqstat(sport->rx_dma_chan);
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if (status & (DMA_DONE|DMA_ERR)) {
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clear_dma_irqstat(sport->rx_dma_chan);
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SSYNC();
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}
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if (sport->rx_callback)
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sport->rx_callback(sport->rx_data);
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return IRQ_HANDLED;
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}
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static irqreturn_t sport_err_irq(int irq, void *dev_id)
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{
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struct sport_device *sport = dev_id;
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struct device *dev = &sport->pdev->dev;
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if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI)
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dev_err(dev, "sport error: TUVF\n");
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if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
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dev_err(dev, "sport error: ROVF\n");
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return IRQ_HANDLED;
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}
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static int sport_get_resource(struct sport_device *sport)
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{
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struct platform_device *pdev = sport->pdev;
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struct device *dev = &pdev->dev;
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struct bfin_snd_platform_data *pdata = dev->platform_data;
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struct resource *res;
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if (!pdata) {
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dev_err(dev, "No platform data\n");
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return -ENODEV;
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}
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sport->pin_req = pdata->pin_req;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev, "No tx MEM resource\n");
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return -ENODEV;
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}
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sport->tx_regs = (struct sport_register *)res->start;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res) {
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dev_err(dev, "No rx MEM resource\n");
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return -ENODEV;
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}
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sport->rx_regs = (struct sport_register *)res->start;
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res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
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if (!res) {
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dev_err(dev, "No tx DMA resource\n");
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return -ENODEV;
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}
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sport->tx_dma_chan = res->start;
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res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
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if (!res) {
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dev_err(dev, "No rx DMA resource\n");
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return -ENODEV;
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}
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sport->rx_dma_chan = res->start;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res) {
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dev_err(dev, "No tx error irq resource\n");
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return -ENODEV;
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}
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sport->tx_err_irq = res->start;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
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if (!res) {
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dev_err(dev, "No rx error irq resource\n");
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return -ENODEV;
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}
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sport->rx_err_irq = res->start;
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return 0;
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}
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static int sport_request_resource(struct sport_device *sport)
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{
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struct device *dev = &sport->pdev->dev;
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int ret;
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ret = peripheral_request_list(sport->pin_req, "soc-audio");
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if (ret) {
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dev_err(dev, "Unable to request sport pin\n");
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return ret;
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}
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ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
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if (ret) {
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dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
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goto err_tx_dma;
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}
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set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
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ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
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if (ret) {
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dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
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goto err_rx_dma;
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}
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set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
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ret = request_irq(sport->tx_err_irq, sport_err_irq,
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0, "SPORT TX ERROR", sport);
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if (ret) {
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dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
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goto err_tx_irq;
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}
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ret = request_irq(sport->rx_err_irq, sport_err_irq,
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0, "SPORT RX ERROR", sport);
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if (ret) {
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dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
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goto err_rx_irq;
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}
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return 0;
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err_rx_irq:
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free_irq(sport->tx_err_irq, sport);
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err_tx_irq:
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free_dma(sport->rx_dma_chan);
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err_rx_dma:
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free_dma(sport->tx_dma_chan);
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err_tx_dma:
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peripheral_free_list(sport->pin_req);
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return ret;
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}
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static void sport_free_resource(struct sport_device *sport)
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{
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free_irq(sport->rx_err_irq, sport);
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free_irq(sport->tx_err_irq, sport);
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free_dma(sport->rx_dma_chan);
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free_dma(sport->tx_dma_chan);
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peripheral_free_list(sport->pin_req);
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}
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struct sport_device *sport_create(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct sport_device *sport;
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int ret;
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sport = kzalloc(sizeof(*sport), GFP_KERNEL);
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if (!sport) {
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dev_err(dev, "Unable to allocate memory for sport device\n");
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return NULL;
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}
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sport->pdev = pdev;
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ret = sport_get_resource(sport);
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if (ret) {
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kfree(sport);
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return NULL;
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}
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ret = sport_request_resource(sport);
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if (ret) {
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kfree(sport);
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return NULL;
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}
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dev_dbg(dev, "SPORT create success\n");
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return sport;
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}
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EXPORT_SYMBOL(sport_create);
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void sport_delete(struct sport_device *sport)
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{
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if (sport->tx_desc)
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dma_free_coherent(NULL, sport->tx_desc_size,
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sport->tx_desc, 0);
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if (sport->rx_desc)
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dma_free_coherent(NULL, sport->rx_desc_size,
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sport->rx_desc, 0);
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sport_free_resource(sport);
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kfree(sport);
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}
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EXPORT_SYMBOL(sport_delete);
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MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
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MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
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MODULE_LICENSE("GPL v2");
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