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spi: spi_bfin uses platform device resources 

Update spi driver to support multi-ports by using platform resources; tested
on STAMP537+SPI_MMC, other boards need more testing.  Plus other minor
updates.

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bryan Wu 2007-12-04 23:45:15 -08:00 committed by Linus Torvalds
parent 2ed355165f
commit a32c691d7c
1 changed files with 83 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

124
drivers/spi/spi_bfin5xx.c
View File

@ -13,6 +13,8 @@
* March 10, 2006 bfin5xx_spi.c Created. (Luke Yang)
* August 7, 2006 added full duplex mode (Axel Weiss & Luke Yang)
* July 17, 2007 add support for BF54x SPI0 controller (Bryan Wu)
* July 30, 2007 add platfrom_resource interface to support multi-port
* SPI controller (Bryan Wu)
*
* Copyright 2004-2007 Analog Devices Inc.
*
@ -50,18 +52,25 @@
#include <asm/portmux.h>
#include <asm/bfin5xx_spi.h>
MODULE_AUTHOR("Bryan Wu, Luke Yang");
MODULE_DESCRIPTION("Blackfin BF5xx SPI Contoller Driver");
#define DRV_NAME "bfin-spi"
#define DRV_AUTHOR "Bryan Wu, Luke Yang"
#define DRV_DESC "Blackfin BF5xx on-chip SPI Contoller Driver"
#define DRV_VERSION "1.0"
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");
#define DRV_NAME "bfin-spi-master"
#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)
static u32 spi_dma_ch;
static u32 spi_regs_base;
#define DEFINE_SPI_REG(reg, off) \
static inline u16 read_##reg(void) \
{ return bfin_read16(SPI0_REGBASE + off); } \
{ return bfin_read16(spi_regs_base + off); } \
static inline void write_##reg(u16 v) \
{bfin_write16(SPI0_REGBASE + off, v); }
{bfin_write16(spi_regs_base + off, v); }
DEFINE_SPI_REG(CTRL, 0x00)
DEFINE_SPI_REG(FLAG, 0x04)
@ -573,10 +582,10 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
struct chip_data *chip = drv_data->cur_chip;
dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
clear_dma_irqstat(CH_SPI);
clear_dma_irqstat(spi_dma_ch);
/* Wait for DMA to complete */
while (get_dma_curr_irqstat(CH_SPI) & DMA_RUN)
while (get_dma_curr_irqstat(spi_dma_ch) & DMA_RUN)
continue;
/*
@ -586,12 +595,12 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
* register until it goes low for 2 successive reads
*/
if (drv_data->tx != NULL) {
while ((bfin_read_SPI_STAT() & TXS) ||
(bfin_read_SPI_STAT() & TXS))
while ((read_STAT() & TXS) ||
(read_STAT() & TXS))
continue;
}
while (!(bfin_read_SPI_STAT() & SPIF))
while (!(read_STAT() & SPIF))
continue;
bfin_spi_disable(drv_data);
@ -610,8 +619,8 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
/* free the irq handler before next transfer */
dev_dbg(&drv_data->pdev->dev,
"disable dma channel irq%d\n",
CH_SPI);
dma_disable_irq(CH_SPI);
spi_dma_ch);
dma_disable_irq(spi_dma_ch);
return IRQ_HANDLED;
}
@ -726,19 +735,19 @@ static void pump_transfers(unsigned long data)
if (drv_data->cur_chip->enable_dma && drv_data->len > 6) {
write_STAT(BIT_STAT_CLR);
disable_dma(CH_SPI);
clear_dma_irqstat(CH_SPI);
disable_dma(spi_dma_ch);
clear_dma_irqstat(spi_dma_ch);
bfin_spi_disable(drv_data);
/* config dma channel */
dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n");
if (width == CFG_SPI_WORDSIZE16) {
set_dma_x_count(CH_SPI, drv_data->len);
set_dma_x_modify(CH_SPI, 2);
set_dma_x_count(spi_dma_ch, drv_data->len);
set_dma_x_modify(spi_dma_ch, 2);
dma_width = WDSIZE_16;
} else {
set_dma_x_count(CH_SPI, drv_data->len);
set_dma_x_modify(CH_SPI, 1);
set_dma_x_count(spi_dma_ch, drv_data->len);
set_dma_x_modify(spi_dma_ch, 1);
dma_width = WDSIZE_8;
}
@ -753,9 +762,10 @@ static void pump_transfers(unsigned long data)
/* no irq in autobuffer mode */
dma_config =
(DMAFLOW_AUTO | RESTART | dma_width | DI_EN);
set_dma_config(CH_SPI, dma_config);
set_dma_start_addr(CH_SPI, (unsigned long)drv_data->tx);
enable_dma(CH_SPI);
set_dma_config(spi_dma_ch, dma_config);
set_dma_start_addr(spi_dma_ch,
(unsigned long)drv_data->tx);
enable_dma(spi_dma_ch);
write_CTRL(cr | CFG_SPI_DMAWRITE | (width << 8) |
(CFG_SPI_ENABLE << 14));
@ -776,14 +786,15 @@ static void pump_transfers(unsigned long data)
/* clear tx reg soformer data is not shifted out */
write_TDBR(0xFF);
set_dma_x_count(CH_SPI, drv_data->len);
set_dma_x_count(spi_dma_ch, drv_data->len);
/* start dma */
dma_enable_irq(CH_SPI);
dma_enable_irq(spi_dma_ch);
dma_config = (WNR | RESTART | dma_width | DI_EN);
set_dma_config(CH_SPI, dma_config);
set_dma_start_addr(CH_SPI, (unsigned long)drv_data->rx);
enable_dma(CH_SPI);
set_dma_config(spi_dma_ch, dma_config);
set_dma_start_addr(spi_dma_ch,
(unsigned long)drv_data->rx);
enable_dma(spi_dma_ch);
cr |=
CFG_SPI_DMAREAD | (width << 8) | (CFG_SPI_ENABLE <<
@ -794,11 +805,12 @@ static void pump_transfers(unsigned long data)
dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
/* start dma */
dma_enable_irq(CH_SPI);
dma_enable_irq(spi_dma_ch);
dma_config = (RESTART | dma_width | DI_EN);
set_dma_config(CH_SPI, dma_config);
set_dma_start_addr(CH_SPI, (unsigned long)drv_data->tx);
enable_dma(CH_SPI);
set_dma_config(spi_dma_ch, dma_config);
set_dma_start_addr(spi_dma_ch,
(unsigned long)drv_data->tx);
enable_dma(spi_dma_ch);
write_CTRL(cr | CFG_SPI_DMAWRITE | (width << 8) |
(CFG_SPI_ENABLE << 14));
@ -1034,17 +1046,17 @@ static int setup(struct spi_device *spi)
*/
if (chip->enable_dma && !dma_requested) {
/* register dma irq handler */
if (request_dma(CH_SPI, "BF53x_SPI_DMA") < 0) {
if (request_dma(spi_dma_ch, "BF53x_SPI_DMA") < 0) {
dev_dbg(&spi->dev,
"Unable to request BlackFin SPI DMA channel\n");
return -ENODEV;
}
if (set_dma_callback(CH_SPI, (void *)dma_irq_handler, drv_data)
< 0) {
if (set_dma_callback(spi_dma_ch, (void *)dma_irq_handler,
drv_data) < 0) {
dev_dbg(&spi->dev, "Unable to set dma callback\n");
return -EPERM;
}
dma_disable_irq(CH_SPI);
dma_disable_irq(spi_dma_ch);
dma_requested = 1;
}
@ -1215,6 +1227,7 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
struct bfin5xx_spi_master *platform_info;
struct spi_master *master;
struct driver_data *drv_data = 0;
struct resource *res;
int status = 0;
platform_info = dev->platform_data;
@ -1242,15 +1255,38 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
master->setup = setup;
master->transfer = transfer;
/* Find and map our resources */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(dev, "Cannot get IORESOURCE_MEM\n");
status = -ENOENT;
goto out_error_get_res;
}
spi_regs_base = (u32) ioremap(res->start, (res->end - res->start)+1);
if (!spi_regs_base) {
dev_err(dev, "Cannot map IO\n");
status = -ENXIO;
goto out_error_ioremap;
}
spi_dma_ch = platform_get_irq(pdev, 0);
if (spi_dma_ch < 0) {
dev_err(dev, "No DMA channel specified\n");
status = -ENOENT;
goto out_error_no_dma_ch;
}
/* Initial and start queue */
status = init_queue(drv_data);
if (status != 0) {
dev_err(&pdev->dev, "problem initializing queue\n");
dev_err(dev, "problem initializing queue\n");
goto out_error_queue_alloc;
}
status = start_queue(drv_data);
if (status != 0) {
dev_err(&pdev->dev, "problem starting queue\n");
dev_err(dev, "problem starting queue\n");
goto out_error_queue_alloc;
}
@ -1258,14 +1294,20 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, drv_data);
status = spi_register_master(master);
if (status != 0) {
dev_err(&pdev->dev, "problem registering spi master\n");
dev_err(dev, "problem registering spi master\n");
goto out_error_queue_alloc;
}
dev_dbg(&pdev->dev, "controller probe successfully\n");
dev_info(dev, "%s, Version %s, regs_base @ 0x%08x\n",
DRV_DESC, DRV_VERSION, spi_regs_base);
return status;
out_error_queue_alloc:
destroy_queue(drv_data);
out_error_no_dma_ch:
iounmap((void *) spi_regs_base);
out_error_ioremap:
out_error_get_res:
out_error:
spi_master_put(master);
@ -1291,8 +1333,8 @@ static int __devexit bfin5xx_spi_remove(struct platform_device *pdev)
/* Release DMA */
if (drv_data->master_info->enable_dma) {
if (dma_channel_active(CH_SPI))
free_dma(CH_SPI);
if (dma_channel_active(spi_dma_ch))
free_dma(spi_dma_ch);
}
/* Disconnect from the SPI framework */
@ -1347,7 +1389,7 @@ static int bfin5xx_spi_resume(struct platform_device *pdev)
MODULE_ALIAS("bfin-spi-master"); /* for platform bus hotplug */
static struct platform_driver bfin5xx_spi_driver = {
.driver = {
.name = "bfin-spi-master",
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.suspend = bfin5xx_spi_suspend,