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Subject[PATCH 06/10] Blackfin SPI driver: update spi driver to support multi-ports
Date
update spi driver to support multi-ports by add platform_resource,
tested on STAMP537+SPI_MMC, other boards need more testing

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
drivers/spi/spi_bfin5xx.c | 124 ++++++++++++++++++++++++++++++---------------
1 files changed, 83 insertions(+), 41 deletions(-)
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 1a83656..891d263 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -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));
@@ -1030,17 +1042,17 @@ 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;
}

@@ -1212,6 +1224,7 @@ 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;
@@ -1239,15 +1252,38 @@ 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;
}

@@ -1255,14 +1291,20 @@ 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);

@@ -1288,8 +1330,8 @@ 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 */
@@ -1344,7 +1386,7 @@ 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,
--
1.5.3.4
-
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