Merge branch 'linux-2.6'

4 files changed, 72 insertions, 100 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index abf0504..aaaea81 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -153,6 +153,7 @@ config SPI_OMAP24XX
 config SPI_PXA2XX
 	tristate "PXA2xx SSP SPI master"
 	depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL
+	select PXA_SSP
 	help
 	  This enables using a PXA2xx SSP port as a SPI master controller.
 	  The driver can be configured to use any SSP port and additional
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index 3cdab13..ea61724 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -350,6 +350,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 		tx = xfer->tx_buf;
 
 		do {
+			c -= 1;
 			if (tx != NULL) {
 				if (mcspi_wait_for_reg_bit(chstat_reg,
 						OMAP2_MCSPI_CHSTAT_TXS) < 0) {
@@ -380,7 +381,6 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 						word_len, *(rx - 1));
 #endif
 			}
-			c -= 1;
 		} while (c);
 	} else if (word_len <= 16) {
 		u16		*rx;
@@ -389,6 +389,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 		rx = xfer->rx_buf;
 		tx = xfer->tx_buf;
 		do {
+			c -= 2;
 			if (tx != NULL) {
 				if (mcspi_wait_for_reg_bit(chstat_reg,
 						OMAP2_MCSPI_CHSTAT_TXS) < 0) {
@@ -419,7 +420,6 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 						word_len, *(rx - 1));
 #endif
 			}
-			c -= 2;
 		} while (c);
 	} else if (word_len <= 32) {
 		u32		*rx;
@@ -428,6 +428,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 		rx = xfer->rx_buf;
 		tx = xfer->tx_buf;
 		do {
+			c -= 4;
 			if (tx != NULL) {
 				if (mcspi_wait_for_reg_bit(chstat_reg,
 						OMAP2_MCSPI_CHSTAT_TXS) < 0) {
@@ -458,7 +459,6 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 						word_len, *(rx - 1));
 #endif
 			}
-			c -= 4;
 		} while (c);
 	}
 
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index 1c2ab54..eb817b8 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -27,6 +27,7 @@
 #include <linux/spi/spi.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -36,6 +37,8 @@
 
 #include <asm/arch/hardware.h>
 #include <asm/arch/pxa-regs.h>
+#include <asm/arch/regs-ssp.h>
+#include <asm/arch/ssp.h>
 #include <asm/arch/pxa2xx_spi.h>
 
 MODULE_AUTHOR("Stephen Street");
@@ -80,6 +83,9 @@ struct driver_data {
 	/* Driver model hookup */
 	struct platform_device *pdev;
 
+	/* SSP Info */
+	struct ssp_device *ssp;
+
 	/* SPI framework hookup */
 	enum pxa_ssp_type ssp_type;
 	struct spi_master *master;
@@ -778,6 +784,16 @@ int set_dma_burst_and_threshold(struct chip_data *chip, struct spi_device *spi,
 	return retval;
 }
 
+static unsigned int ssp_get_clk_div(struct ssp_device *ssp, int rate)
+{
+	unsigned long ssp_clk = clk_get_rate(ssp->clk);
+
+	if (ssp->type == PXA25x_SSP)
+		return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8;
+	else
+		return ((ssp_clk / rate - 1) & 0xfff) << 8;
+}
+
 static void pump_transfers(unsigned long data)
 {
 	struct driver_data *drv_data = (struct driver_data *)data;
@@ -785,6 +801,7 @@ static void pump_transfers(unsigned long data)
 	struct spi_transfer *transfer = NULL;
 	struct spi_transfer *previous = NULL;
 	struct chip_data *chip = NULL;
+	struct ssp_device *ssp = drv_data->ssp;
 	void *reg = drv_data->ioaddr;
 	u32 clk_div = 0;
 	u8 bits = 0;
@@ -866,12 +883,7 @@ static void pump_transfers(unsigned long data)
 		if (transfer->bits_per_word)
 			bits = transfer->bits_per_word;
 
-		if (reg == SSP1_VIRT)
-			clk_div = SSP1_SerClkDiv(speed);
-		else if (reg == SSP2_VIRT)
-			clk_div = SSP2_SerClkDiv(speed);
-		else if (reg == SSP3_VIRT)
-			clk_div = SSP3_SerClkDiv(speed);
+		clk_div = ssp_get_clk_div(ssp, speed);
 
 		if (bits <= 8) {
 			drv_data->n_bytes = 1;
@@ -1074,6 +1086,7 @@ static int setup(struct spi_device *spi)
 	struct pxa2xx_spi_chip *chip_info = NULL;
 	struct chip_data *chip;
 	struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+	struct ssp_device *ssp = drv_data->ssp;
 	unsigned int clk_div;
 
 	if (!spi->bits_per_word)
@@ -1157,18 +1170,7 @@ static int setup(struct spi_device *spi)
 		}
 	}
 
-	if (drv_data->ioaddr == SSP1_VIRT)
-		clk_div = SSP1_SerClkDiv(spi->max_speed_hz);
-	else if (drv_data->ioaddr == SSP2_VIRT)
-		clk_div = SSP2_SerClkDiv(spi->max_speed_hz);
-	else if (drv_data->ioaddr == SSP3_VIRT)
-		clk_div = SSP3_SerClkDiv(spi->max_speed_hz);
-	else
-	{
-		dev_err(&spi->dev, "failed setup: unknown IO address=0x%p\n",
-			drv_data->ioaddr);
-		return -ENODEV;
-	}
+	clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz);
 	chip->speed_hz = spi->max_speed_hz;
 
 	chip->cr0 = clk_div
@@ -1183,15 +1185,15 @@ static int setup(struct spi_device *spi)
 
 	/* NOTE:  PXA25x_SSP _could_ use external clocking ... */
 	if (drv_data->ssp_type != PXA25x_SSP)
-		dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
+		dev_dbg(&spi->dev, "%d bits/word, %ld Hz, mode %d\n",
 				spi->bits_per_word,
-				(CLOCK_SPEED_HZ)
+				clk_get_rate(ssp->clk)
 					/ (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
 				spi->mode & 0x3);
 	else
-		dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
+		dev_dbg(&spi->dev, "%d bits/word, %ld Hz, mode %d\n",
 				spi->bits_per_word,
-				(CLOCK_SPEED_HZ/2)
+				clk_get_rate(ssp->clk)
 					/ (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
 				spi->mode & 0x3);
 
@@ -1323,14 +1325,14 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
 	struct pxa2xx_spi_master *platform_info;
 	struct spi_master *master;
 	struct driver_data *drv_data = 0;
-	struct resource *memory_resource;
-	int irq;
+	struct ssp_device *ssp;
 	int status = 0;
 
 	platform_info = dev->platform_data;
 
-	if (platform_info->ssp_type == SSP_UNDEFINED) {
-		dev_err(&pdev->dev, "undefined SSP\n");
+	ssp = ssp_request(pdev->id, pdev->name);
+	if (ssp == NULL) {
+		dev_err(&pdev->dev, "failed to request SSP%d\n", pdev->id);
 		return -ENODEV;
 	}
 
@@ -1338,12 +1340,14 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
 	master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
 	if (!master) {
 		dev_err(&pdev->dev, "can not alloc spi_master\n");
+		ssp_free(ssp);
 		return -ENOMEM;
 	}
 	drv_data = spi_master_get_devdata(master);
 	drv_data->master = master;
 	drv_data->master_info = platform_info;
 	drv_data->pdev = pdev;
+	drv_data->ssp = ssp;
 
 	master->bus_num = pdev->id;
 	master->num_chipselect = platform_info->num_chipselect;
@@ -1351,21 +1355,13 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
 	master->setup = setup;
 	master->transfer = transfer;
 
-	drv_data->ssp_type = platform_info->ssp_type;
+	drv_data->ssp_type = ssp->type;
 	drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data +
 						sizeof(struct driver_data)), 8);
 
-	/* Setup register addresses */
-	memory_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!memory_resource) {
-		dev_err(&pdev->dev, "memory resources not defined\n");
-		status = -ENODEV;
-		goto out_error_master_alloc;
-	}
-
-	drv_data->ioaddr = (void *)io_p2v((unsigned long)(memory_resource->start));
-	drv_data->ssdr_physical = memory_resource->start + 0x00000010;
-	if (platform_info->ssp_type == PXA25x_SSP) {
+	drv_data->ioaddr = ssp->mmio_base;
+	drv_data->ssdr_physical = ssp->phys_base + SSDR;
+	if (ssp->type == PXA25x_SSP) {
 		drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
 		drv_data->dma_cr1 = 0;
 		drv_data->clear_sr = SSSR_ROR;
@@ -1377,15 +1373,7 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
 		drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
 	}
 
-	/* Attach to IRQ */
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "irq resource not defined\n");
-		status = -ENODEV;
-		goto out_error_master_alloc;
-	}
-
-	status = request_irq(irq, ssp_int, 0, dev->bus_id, drv_data);
+	status = request_irq(ssp->irq, ssp_int, 0, dev->bus_id, drv_data);
 	if (status < 0) {
 		dev_err(&pdev->dev, "can not get IRQ\n");
 		goto out_error_master_alloc;
@@ -1418,29 +1406,12 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
 			goto out_error_dma_alloc;
 		}
 
-		if (drv_data->ioaddr == SSP1_VIRT) {
-				DRCMRRXSSDR = DRCMR_MAPVLD
-						| drv_data->rx_channel;
-				DRCMRTXSSDR = DRCMR_MAPVLD
-						| drv_data->tx_channel;
-		} else if (drv_data->ioaddr == SSP2_VIRT) {
-				DRCMRRXSS2DR = DRCMR_MAPVLD
-						| drv_data->rx_channel;
-				DRCMRTXSS2DR = DRCMR_MAPVLD
-						| drv_data->tx_channel;
-		} else if (drv_data->ioaddr == SSP3_VIRT) {
-				DRCMRRXSS3DR = DRCMR_MAPVLD
-						| drv_data->rx_channel;
-				DRCMRTXSS3DR = DRCMR_MAPVLD
-						| drv_data->tx_channel;
-		} else {
-			dev_err(dev, "bad SSP type\n");
-			goto out_error_dma_alloc;
-		}
+		DRCMR(ssp->drcmr_rx) = DRCMR_MAPVLD | drv_data->rx_channel;
+		DRCMR(ssp->drcmr_tx) = DRCMR_MAPVLD | drv_data->tx_channel;
 	}
 
 	/* Enable SOC clock */
-	pxa_set_cken(platform_info->clock_enable, 1);
+	clk_enable(ssp->clk);
 
 	/* Load default SSP configuration */
 	write_SSCR0(0, drv_data->ioaddr);
@@ -1479,7 +1450,7 @@ out_error_queue_alloc:
 	destroy_queue(drv_data);
 
 out_error_clock_enabled:
-	pxa_set_cken(platform_info->clock_enable, 0);
+	clk_disable(ssp->clk);
 
 out_error_dma_alloc:
 	if (drv_data->tx_channel != -1)
@@ -1488,17 +1459,18 @@ out_error_dma_alloc:
 		pxa_free_dma(drv_data->rx_channel);
 
 out_error_irq_alloc:
-	free_irq(irq, drv_data);
+	free_irq(ssp->irq, drv_data);
 
 out_error_master_alloc:
 	spi_master_put(master);
+	ssp_free(ssp);
 	return status;
 }
 
 static int pxa2xx_spi_remove(struct platform_device *pdev)
 {
 	struct driver_data *drv_data = platform_get_drvdata(pdev);
-	int irq;
+	struct ssp_device *ssp = drv_data->ssp;
 	int status = 0;
 
 	if (!drv_data)
@@ -1520,28 +1492,21 @@ static int pxa2xx_spi_remove(struct platform_device *pdev)
 
 	/* Disable the SSP at the peripheral and SOC level */
 	write_SSCR0(0, drv_data->ioaddr);
-	pxa_set_cken(drv_data->master_info->clock_enable, 0);
+	clk_disable(ssp->clk);
 
 	/* Release DMA */
 	if (drv_data->master_info->enable_dma) {
-		if (drv_data->ioaddr == SSP1_VIRT) {
-			DRCMRRXSSDR = 0;
-			DRCMRTXSSDR = 0;
-		} else if (drv_data->ioaddr == SSP2_VIRT) {
-			DRCMRRXSS2DR = 0;
-			DRCMRTXSS2DR = 0;
-		} else if (drv_data->ioaddr == SSP3_VIRT) {
-			DRCMRRXSS3DR = 0;
-			DRCMRTXSS3DR = 0;
-		}
+		DRCMR(ssp->drcmr_rx) = 0;
+		DRCMR(ssp->drcmr_tx) = 0;
 		pxa_free_dma(drv_data->tx_channel);
 		pxa_free_dma(drv_data->rx_channel);
 	}
 
 	/* Release IRQ */
-	irq = platform_get_irq(pdev, 0);
-	if (irq >= 0)
-		free_irq(irq, drv_data);
+	free_irq(ssp->irq, drv_data);
+
+	/* Release SSP */
+	ssp_free(ssp);
 
 	/* Disconnect from the SPI framework */
 	spi_unregister_master(drv_data->master);
@@ -1576,6 +1541,7 @@ static int suspend_devices(struct device *dev, void *pm_message)
 static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct driver_data *drv_data = platform_get_drvdata(pdev);
+	struct ssp_device *ssp = drv_data->ssp;
 	int status = 0;
 
 	/* Check all childern for current power state */
@@ -1588,7 +1554,7 @@ static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
 	if (status != 0)
 		return status;
 	write_SSCR0(0, drv_data->ioaddr);
-	pxa_set_cken(drv_data->master_info->clock_enable, 0);
+	clk_disable(ssp->clk);
 
 	return 0;
 }
@@ -1596,10 +1562,11 @@ static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
 static int pxa2xx_spi_resume(struct platform_device *pdev)
 {
 	struct driver_data *drv_data = platform_get_drvdata(pdev);
+	struct ssp_device *ssp = drv_data->ssp;
 	int status = 0;
 
 	/* Enable the SSP clock */
-	pxa_set_cken(drv_data->master_info->clock_enable, 1);
+	clk_disable(ssp->clk);
 
 	/* Start the queue running */
 	status = start_queue(drv_data);
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 93e9de4..682a6a4 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -485,6 +485,15 @@ void spi_unregister_master(struct spi_master *master)
 }
 EXPORT_SYMBOL_GPL(spi_unregister_master);
 
+static int __spi_master_match(struct device *dev, void *data)
+{
+	struct spi_master *m;
+	u16 *bus_num = data;
+
+	m = container_of(dev, struct spi_master, dev);
+	return m->bus_num == *bus_num;
+}
+
 /**
  * spi_busnum_to_master - look up master associated with bus_num
  * @bus_num: the master's bus number
@@ -499,17 +508,12 @@ struct spi_master *spi_busnum_to_master(u16 bus_num)
 {
 	struct device		*dev;
 	struct spi_master	*master = NULL;
-	struct spi_master	*m;
-
-	down(&spi_master_class.sem);
-	list_for_each_entry(dev, &spi_master_class.children, node) {
-		m = container_of(dev, struct spi_master, dev);
-		if (m->bus_num == bus_num) {
-			master = spi_master_get(m);
-			break;
-		}
-	}
-	up(&spi_master_class.sem);
+
+	dev = class_find_device(&spi_master_class, &bus_num,
+				__spi_master_match);
+	if (dev)
+		master = container_of(dev, struct spi_master, dev);
+	/* reference got in class_find_device */
 	return master;
 }
 EXPORT_SYMBOL_GPL(spi_busnum_to_master);