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