diff options
Diffstat (limited to 'drivers/spi/spi_bfin5xx.c')
| -rw-r--r-- | 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 8e4ea8906dc7..a8311a83ae96 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)); @@ -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, |