split spi patch, follow mainline file naming

SVN-Revision: 34168

target/linux/cns3xxx/files/drivers/spi/spi-cns3xxx.c

@@ -0,0 +1,449 @@
+/*******************************************************************************
+ *
+ *  CNS3XXX SPI controller driver (master mode only)
+ *
+ *  Copyright (c) 2008 Cavium Networks
+ *  Copyright 2011 Gateworks Corporation
+ *		   Chris Lang <clang@gateworks.com>
+ *
+ *  This file 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 file is distributed in the hope that it will be useful,
+ *  but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ *  NONINFRINGEMENT.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this file; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
+ *  visit http://www.gnu.org/licenses/.
+ *
+ *  This file may also be available under a different license from Cavium.
+ *  Contact Cavium Networks for more information
+ *
+ ******************************************************************************/
+
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+#include <linux/mtd/partitions.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/memory.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <mach/cns3xxx.h>
+#include <linux/module.h>
+#include <mach/pm.h>
+
+/*
+ * define access macros
+ */
+#define SPI_MEM_MAP_VALUE(reg_offset)		(*((u32 volatile *)(CNS3XXX_SSP_BASE_VIRT + reg_offset)))
+
+#define SPI_CONFIGURATION_REG			SPI_MEM_MAP_VALUE(0x40)
+#define SPI_SERVICE_STATUS_REG			SPI_MEM_MAP_VALUE(0x44)
+#define SPI_BIT_RATE_CONTROL_REG		SPI_MEM_MAP_VALUE(0x48)
+#define SPI_TRANSMIT_CONTROL_REG		SPI_MEM_MAP_VALUE(0x4C)
+#define SPI_TRANSMIT_BUFFER_REG			SPI_MEM_MAP_VALUE(0x50)
+#define SPI_RECEIVE_CONTROL_REG			SPI_MEM_MAP_VALUE(0x54)
+#define SPI_RECEIVE_BUFFER_REG			SPI_MEM_MAP_VALUE(0x58)
+#define SPI_FIFO_TRANSMIT_CONFIG_REG		SPI_MEM_MAP_VALUE(0x5C)
+#define SPI_FIFO_TRANSMIT_CONTROL_REG		SPI_MEM_MAP_VALUE(0x60)
+#define SPI_FIFO_RECEIVE_CONFIG_REG		SPI_MEM_MAP_VALUE(0x64)
+#define SPI_INTERRUPT_STATUS_REG		SPI_MEM_MAP_VALUE(0x68)
+#define SPI_INTERRUPT_ENABLE_REG		SPI_MEM_MAP_VALUE(0x6C)
+
+#define SPI_TRANSMIT_BUFFER_REG_ADDR		(CNS3XXX_SSP_BASE +0x50)
+#define SPI_RECEIVE_BUFFER_REG_ADDR		(CNS3XXX_SSP_BASE +0x58)
+
+/* Structure for SPI controller of CNS3XXX SOCs */
+struct cns3xxx_spi {
+	/* bitbang has to be first */
+	struct spi_bitbang bitbang;
+	struct completion done;
+	wait_queue_head_t wait;
+
+	int len;
+	int count;
+	int last_in_message_list;
+
+	/* data buffers */
+	const unsigned char *tx;
+	unsigned char *rx;
+
+	struct spi_master *master;
+	struct platform_device *pdev;
+	struct device *dev;
+};
+
+static inline u8 cns3xxx_spi_bus_idle(void)
+{
+	return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1);
+}
+
+static inline u8 cns3xxx_spi_tx_buffer_empty(void)
+{
+	return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0);
+}
+
+static inline u8 cns3xxx_spi_rx_buffer_full(void)
+{
+	return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0);
+}
+
+u8 cns3xxx_spi_tx_rx(u8 tx_channel, u8 tx_eof, u32 tx_data,
+			    u32 * rx_data)
+{
+	u8 rx_channel;
+	u8 rx_eof;
+
+	while (!cns3xxx_spi_bus_idle()) ;	// do nothing
+
+	while (!cns3xxx_spi_tx_buffer_empty()) ;	// do nothing
+
+	SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+	SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
+
+	SPI_TRANSMIT_BUFFER_REG = tx_data;
+
+	while (!cns3xxx_spi_rx_buffer_full()) ;	// do nothing
+
+	rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3;
+	rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0;
+
+	*rx_data = SPI_RECEIVE_BUFFER_REG;
+
+	if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+u8 cns3xxx_spi_tx(u8 tx_channel, u8 tx_eof, u32 tx_data)
+{
+
+        while (!cns3xxx_spi_bus_idle()) ;       // do nothing
+
+        while (!cns3xxx_spi_tx_buffer_empty()) ;        // do nothing
+
+        SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+        SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
+
+        SPI_TRANSMIT_BUFFER_REG = tx_data;
+
+        return 1;
+}
+
+static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev)
+{
+	return spi_master_get_devdata(sdev->master);
+}
+
+static int cns3xxx_spi_setup_transfer(struct spi_device *spi,
+				      struct spi_transfer *t)
+{
+	return 0;
+}
+
+static void cns3xxx_spi_chipselect(struct spi_device *spi, int value)
+{
+	unsigned int spi_config;
+
+	switch (value) {
+	case BITBANG_CS_INACTIVE:
+		break;
+
+	case BITBANG_CS_ACTIVE:
+		spi_config = SPI_CONFIGURATION_REG;
+
+		if (spi->mode & SPI_CPHA)
+			spi_config |= (0x1 << 13);
+		else
+			spi_config &= ~(0x1 << 13);
+
+		if (spi->mode & SPI_CPOL)
+			spi_config |= (0x1 << 14);
+		else
+			spi_config &= ~(0x1 << 14);
+
+		/* write new configration */
+		SPI_CONFIGURATION_REG = spi_config;
+
+		SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+		SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3);
+
+		break;
+	}
+}
+
+static int cns3xxx_spi_setup(struct spi_device *spi)
+{
+	if (!spi->bits_per_word)
+		spi->bits_per_word = 8;
+
+	return 0;
+}
+
+static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
+{
+	struct cns3xxx_spi *hw = to_hw(spi);
+
+	dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf,
+		t->len);
+
+	hw->tx = t->tx_buf;
+	hw->rx = t->rx_buf;
+	hw->len = t->len;
+	hw->count = 0;
+	hw->last_in_message_list = t->last_in_message_list;
+
+	init_completion(&hw->done);
+
+	if (hw->tx) {
+		int i;
+		u32 rx_data;
+		for (i = 0; i < (hw->len - 1); i++) {
+			dev_dbg(&spi->dev,
+				"[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i,
+				hw->tx[i]);
+			cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
+					  &rx_data);
+			if (hw->rx) {
+				hw->rx[i] = rx_data;
+				dev_dbg(&spi->dev,
+					"[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
+					i, hw->rx[i]);
+			}
+		}
+
+		if (t->last_in_message_list) {
+			cns3xxx_spi_tx_rx(spi->chip_select, 1, hw->tx[i],
+					  &rx_data);
+			if (hw->rx) {
+				hw->rx[i] = rx_data;
+				dev_dbg(&spi->dev,
+					"[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
+					i, hw->rx[i]);
+			}
+		} else {
+			cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
+					  &rx_data);
+		}
+		goto done;
+	}
+
+	if (hw->rx) {
+		int i;
+		u32 rx_data;
+		for (i = 0; i < (hw->len - 1); i++) {
+			cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
+			hw->rx[i] = rx_data;
+			dev_dbg(&spi->dev,
+				"[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i,
+				hw->rx[i]);
+		}
+
+		if (t->last_in_message_list) {
+			cns3xxx_spi_tx_rx(spi->chip_select, 1, 0xff, &rx_data);
+		} else {
+			cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
+		}
+		hw->rx[i] = rx_data;
+		dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
+			i, hw->rx[i]);
+	}
+done:
+	return hw->len;
+}
+
+static void __init cns3xxx_spi_initial(void)
+{
+	u32 __iomem *gpiob = (void __iomem *) (CNS3XXX_MISC_BASE_VIRT + 0x0018);
+	u32 gpiob_pins = __raw_readl(gpiob);
+
+	/* MMC/SD pins share with GPIOA */
+	gpiob_pins |= 0xf80;
+	__raw_writel(gpiob_pins, gpiob);
+
+	/* share pin config. */
+	//PM_PLL_HM_PD_CTRL_REG &= ~(0x1 << 5);
+	//HAL_MISC_ENABLE_SPI_PINS();
+	cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SPI_PCM_I2C));
+	cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SPI_PCM_I2C));
+
+	SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) |	/* 8bits shift length */
+				 (0x0 << 9) |	/* SPI mode */
+				 (0x0 << 10) |	/* disable FIFO */
+				 (0x1 << 11) |	/* SPI master mode */
+				 (0x0 << 12) |	/* disable SPI loopback mode */
+				 (0x1 << 13) |	/* clock phase */
+				 (0x1 << 14) |	/* clock polarity */
+				 (0x0 << 24) |	/* disable - SPI data swap */
+				 (0x1 << 29) |	/* enable - 2IO Read mode */
+				 (0x0 << 30) |	/* disable - SPI high speed read for system boot up */
+				 (0x0 << 31));	/* disable - SPI */
+
+	/* Set SPI bit rate PCLK/2 */
+	SPI_BIT_RATE_CONTROL_REG = 0x1;
+
+	/* Set SPI Tx channel 0 */
+	SPI_TRANSMIT_CONTROL_REG = 0x0;
+
+	/* Set Tx FIFO Threshold, Tx FIFO has 2 words */
+	SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4);
+	SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4);
+
+	/* Set Rx FIFO Threshold, Rx FIFO has 2 words */
+	SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4);
+	SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4);
+
+	/* Disable all interrupt */
+	SPI_INTERRUPT_ENABLE_REG = 0x0;
+
+	/* Clear spurious interrupt sources */
+	SPI_INTERRUPT_STATUS_REG = (0x0F << 4);
+
+	/* Enable SPI */
+	SPI_CONFIGURATION_REG |= (0x1 << 31);
+
+	return;
+}
+
+static int __devinit cns3xxx_spi_probe(struct platform_device *pdev)
+{
+	struct spi_master *master;
+	struct cns3xxx_spi *hw;
+	int err = 0;
+
+	printk("%s: setup CNS3XXX SPI Controller\n", __FUNCTION__);
+
+	/* Allocate master with space for cns3xxx_spi */
+	master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi));
+	if (master == NULL) {
+		dev_err(&pdev->dev, "No memory for spi_master\n");
+		err = -ENOMEM;
+		goto err_nomem;
+	}
+
+	hw = spi_master_get_devdata(master);
+	memset(hw, 0, sizeof(struct cns3xxx_spi));
+
+	hw->master = spi_master_get(master);
+	hw->dev = &pdev->dev;
+
+	platform_set_drvdata(pdev, hw);
+	init_completion(&hw->done);
+
+	/* setup the master state. */
+
+	master->num_chipselect = 4;
+	master->bus_num = 1;
+
+	/* setup the state for the bitbang driver */
+
+	hw->bitbang.master = hw->master;
+	hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer;
+	hw->bitbang.chipselect = cns3xxx_spi_chipselect;
+	hw->bitbang.txrx_bufs = cns3xxx_spi_txrx;
+	hw->bitbang.master->setup = cns3xxx_spi_setup;
+
+	dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
+
+	/* SPI controller initializations */
+	cns3xxx_spi_initial();
+
+	/* register SPI controller */
+
+	err = spi_bitbang_start(&hw->bitbang);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to register SPI master\n");
+		goto err_register;
+	}
+
+	return 0;
+
+err_register:
+	spi_master_put(hw->master);;
+
+err_nomem:
+	return err;
+}
+
+static int __devexit cns3xxx_spi_remove(struct platform_device *dev)
+{
+	struct cns3xxx_spi *hw = platform_get_drvdata(dev);
+
+	platform_set_drvdata(dev, NULL);
+
+	spi_unregister_master(hw->master);
+
+	spi_master_put(hw->master);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+	struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
+
+	return 0;
+}
+
+static int cns3xxx_spi_resume(struct platform_device *pdev)
+{
+	struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
+
+	return 0;
+}
+
+#else
+#define cns3xxx_spi_suspend	NULL
+#define cns3xxx_spi_resume	NULL
+#endif
+
+static struct platform_driver cns3xxx_spi_driver = {
+	.probe		= cns3xxx_spi_probe,
+	.remove		= __devexit_p(cns3xxx_spi_remove),
+	.suspend	= cns3xxx_spi_suspend,
+	.resume		= cns3xxx_spi_resume,
+	.driver		= {
+		.name = "cns3xxx_spi",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init cns3xxx_spi_init(void)
+{
+	return platform_driver_register(&cns3xxx_spi_driver);
+}
+
+static void __exit cns3xxx_spi_exit(void)
+{
+	platform_driver_unregister(&cns3xxx_spi_driver);
+}
+
+module_init(cns3xxx_spi_init);
+module_exit(cns3xxx_spi_exit);
+
+MODULE_AUTHOR("Cavium Networks");
+MODULE_DESCRIPTION("CNS3XXX SPI Controller Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:cns3xxx_spi");
+
+EXPORT_SYMBOL_GPL(cns3xxx_spi_tx_rx);

target/linux/cns3xxx/patches-3.3/052-cns3xxx_spi.patch

@@ -20,478 +20,10 @@
  obj-$(CONFIG_SPI_BFIN_SPORT)		+= spi-bfin-sport.o
  obj-$(CONFIG_SPI_BITBANG)		+= spi-bitbang.o
  obj-$(CONFIG_SPI_BUTTERFLY)		+= spi-butterfly.o
-+obj-$(CONFIG_SPI_CNS3XXX)		+= spi_cns3xxx.o
++obj-$(CONFIG_SPI_CNS3XXX)		+= spi-cns3xxx.o
  obj-$(CONFIG_SPI_COLDFIRE_QSPI)		+= spi-coldfire-qspi.o
  obj-$(CONFIG_SPI_DAVINCI)		+= spi-davinci.o
  obj-$(CONFIG_SPI_DESIGNWARE)		+= spi-dw.o
---- /dev/null
-+++ b/drivers/spi/spi_cns3xxx.c
-@@ -0,0 +1,449 @@
-+/*******************************************************************************
-+ *
-+ *  CNS3XXX SPI controller driver (master mode only)
-+ *
-+ *  Copyright (c) 2008 Cavium Networks
-+ *  Copyright 2011 Gateworks Corporation
-+ *		   Chris Lang <clang@gateworks.com>
-+ *
-+ *  This file 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 file is distributed in the hope that it will be useful,
-+ *  but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
-+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
-+ *  NONINFRINGEMENT.  See the GNU General Public License for more details.
-+ *
-+ *  You should have received a copy of the GNU General Public License
-+ *  along with this file; if not, write to the Free Software
-+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
-+ *  visit http://www.gnu.org/licenses/.
-+ *
-+ *  This file may also be available under a different license from Cavium.
-+ *  Contact Cavium Networks for more information
-+ *
-+ ******************************************************************************/
-+
-+#include <linux/init.h>
-+#include <linux/spinlock.h>
-+#include <linux/workqueue.h>
-+#include <linux/interrupt.h>
-+#include <linux/delay.h>
-+#include <linux/errno.h>
-+#include <linux/err.h>
-+#include <linux/clk.h>
-+#include <linux/platform_device.h>
-+
-+#include <linux/spi/spi.h>
-+#include <linux/spi/spi_bitbang.h>
-+#include <linux/mtd/partitions.h>
-+#include <linux/dma-mapping.h>
-+#include <linux/slab.h>
-+
-+#include <asm/io.h>
-+#include <asm/memory.h>
-+#include <asm/dma.h>
-+#include <asm/delay.h>
-+#include <mach/cns3xxx.h>
-+#include <linux/module.h>
-+#include <mach/pm.h>
-+
-+/*
-+ * define access macros
-+ */
-+#define SPI_MEM_MAP_VALUE(reg_offset)		(*((u32 volatile *)(CNS3XXX_SSP_BASE_VIRT + reg_offset)))
-+
-+#define SPI_CONFIGURATION_REG			SPI_MEM_MAP_VALUE(0x40)
-+#define SPI_SERVICE_STATUS_REG			SPI_MEM_MAP_VALUE(0x44)
-+#define SPI_BIT_RATE_CONTROL_REG		SPI_MEM_MAP_VALUE(0x48)
-+#define SPI_TRANSMIT_CONTROL_REG		SPI_MEM_MAP_VALUE(0x4C)
-+#define SPI_TRANSMIT_BUFFER_REG			SPI_MEM_MAP_VALUE(0x50)
-+#define SPI_RECEIVE_CONTROL_REG			SPI_MEM_MAP_VALUE(0x54)
-+#define SPI_RECEIVE_BUFFER_REG			SPI_MEM_MAP_VALUE(0x58)
-+#define SPI_FIFO_TRANSMIT_CONFIG_REG		SPI_MEM_MAP_VALUE(0x5C)
-+#define SPI_FIFO_TRANSMIT_CONTROL_REG		SPI_MEM_MAP_VALUE(0x60)
-+#define SPI_FIFO_RECEIVE_CONFIG_REG		SPI_MEM_MAP_VALUE(0x64)
-+#define SPI_INTERRUPT_STATUS_REG		SPI_MEM_MAP_VALUE(0x68)
-+#define SPI_INTERRUPT_ENABLE_REG		SPI_MEM_MAP_VALUE(0x6C)
-+
-+#define SPI_TRANSMIT_BUFFER_REG_ADDR		(CNS3XXX_SSP_BASE +0x50)
-+#define SPI_RECEIVE_BUFFER_REG_ADDR		(CNS3XXX_SSP_BASE +0x58)
-+
-+/* Structure for SPI controller of CNS3XXX SOCs */
-+struct cns3xxx_spi {
-+	/* bitbang has to be first */
-+	struct spi_bitbang bitbang;
-+	struct completion done;
-+	wait_queue_head_t wait;
-+
-+	int len;
-+	int count;
-+	int last_in_message_list;
-+
-+	/* data buffers */
-+	const unsigned char *tx;
-+	unsigned char *rx;
-+
-+	struct spi_master *master;
-+	struct platform_device *pdev;
-+	struct device *dev;
-+};
-+
-+static inline u8 cns3xxx_spi_bus_idle(void)
-+{
-+	return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1);
-+}
-+
-+static inline u8 cns3xxx_spi_tx_buffer_empty(void)
-+{
-+	return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0);
-+}
-+
-+static inline u8 cns3xxx_spi_rx_buffer_full(void)
-+{
-+	return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0);
-+}
-+
-+u8 cns3xxx_spi_tx_rx(u8 tx_channel, u8 tx_eof, u32 tx_data,
-+			    u32 * rx_data)
-+{
-+	u8 rx_channel;
-+	u8 rx_eof;
-+
-+	while (!cns3xxx_spi_bus_idle()) ;	// do nothing
-+
-+	while (!cns3xxx_spi_tx_buffer_empty()) ;	// do nothing
-+
-+	SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
-+	SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
-+
-+	SPI_TRANSMIT_BUFFER_REG = tx_data;
-+
-+	while (!cns3xxx_spi_rx_buffer_full()) ;	// do nothing
-+
-+	rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3;
-+	rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0;
-+
-+	*rx_data = SPI_RECEIVE_BUFFER_REG;
-+
-+	if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) {
-+		return 0;
-+	} else {
-+		return 1;
-+	}
-+}
-+
-+u8 cns3xxx_spi_tx(u8 tx_channel, u8 tx_eof, u32 tx_data)
-+{
-+
-+        while (!cns3xxx_spi_bus_idle()) ;       // do nothing
-+
-+        while (!cns3xxx_spi_tx_buffer_empty()) ;        // do nothing
-+
-+        SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
-+        SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
-+
-+        SPI_TRANSMIT_BUFFER_REG = tx_data;
-+
-+        return 1;
-+}
-+
-+static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev)
-+{
-+	return spi_master_get_devdata(sdev->master);
-+}
-+
-+static int cns3xxx_spi_setup_transfer(struct spi_device *spi,
-+				      struct spi_transfer *t)
-+{
-+	return 0;
-+}
-+
-+static void cns3xxx_spi_chipselect(struct spi_device *spi, int value)
-+{
-+	unsigned int spi_config;
-+
-+	switch (value) {
-+	case BITBANG_CS_INACTIVE:
-+		break;
-+
-+	case BITBANG_CS_ACTIVE:
-+		spi_config = SPI_CONFIGURATION_REG;
-+
-+		if (spi->mode & SPI_CPHA)
-+			spi_config |= (0x1 << 13);
-+		else
-+			spi_config &= ~(0x1 << 13);
-+
-+		if (spi->mode & SPI_CPOL)
-+			spi_config |= (0x1 << 14);
-+		else
-+			spi_config &= ~(0x1 << 14);
-+
-+		/* write new configration */
-+		SPI_CONFIGURATION_REG = spi_config;
-+
-+		SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
-+		SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3);
-+
-+		break;
-+	}
-+}
-+
-+static int cns3xxx_spi_setup(struct spi_device *spi)
-+{
-+	if (!spi->bits_per_word)
-+		spi->bits_per_word = 8;
-+
-+	return 0;
-+}
-+
-+static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
-+{
-+	struct cns3xxx_spi *hw = to_hw(spi);
-+
-+	dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf,
-+		t->len);
-+
-+	hw->tx = t->tx_buf;
-+	hw->rx = t->rx_buf;
-+	hw->len = t->len;
-+	hw->count = 0;
-+	hw->last_in_message_list = t->last_in_message_list;
-+
-+	init_completion(&hw->done);
-+
-+	if (hw->tx) {
-+		int i;
-+		u32 rx_data;
-+		for (i = 0; i < (hw->len - 1); i++) {
-+			dev_dbg(&spi->dev,
-+				"[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i,
-+				hw->tx[i]);
-+			cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
-+					  &rx_data);
-+			if (hw->rx) {
-+				hw->rx[i] = rx_data;
-+				dev_dbg(&spi->dev,
-+					"[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
-+					i, hw->rx[i]);
-+			}
-+		}
-+
-+		if (t->last_in_message_list) {
-+			cns3xxx_spi_tx_rx(spi->chip_select, 1, hw->tx[i],
-+					  &rx_data);
-+			if (hw->rx) {
-+				hw->rx[i] = rx_data;
-+				dev_dbg(&spi->dev,
-+					"[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
-+					i, hw->rx[i]);
-+			}
-+		} else {
-+			cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
-+					  &rx_data);
-+		}
-+		goto done;
-+	}
-+
-+	if (hw->rx) {
-+		int i;
-+		u32 rx_data;
-+		for (i = 0; i < (hw->len - 1); i++) {
-+			cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
-+			hw->rx[i] = rx_data;
-+			dev_dbg(&spi->dev,
-+				"[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i,
-+				hw->rx[i]);
-+		}
-+
-+		if (t->last_in_message_list) {
-+			cns3xxx_spi_tx_rx(spi->chip_select, 1, 0xff, &rx_data);
-+		} else {
-+			cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
-+		}
-+		hw->rx[i] = rx_data;
-+		dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
-+			i, hw->rx[i]);
-+	}
-+done:
-+	return hw->len;
-+}
-+
-+static void __init cns3xxx_spi_initial(void)
-+{
-+	u32 __iomem *gpiob = __io(CNS3XXX_MISC_BASE_VIRT + 0x0018);
-+	u32 gpiob_pins = __raw_readl(gpiob);
-+
-+	/* MMC/SD pins share with GPIOA */
-+	gpiob_pins |= 0xf80;
-+	__raw_writel(gpiob_pins, gpiob);
-+
-+	/* share pin config. */
-+	//PM_PLL_HM_PD_CTRL_REG &= ~(0x1 << 5);
-+	//HAL_MISC_ENABLE_SPI_PINS();
-+	cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SPI_PCM_I2C));
-+	cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SPI_PCM_I2C));
-+
-+	SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) |	/* 8bits shift length */
-+				 (0x0 << 9) |	/* SPI mode */
-+				 (0x0 << 10) |	/* disable FIFO */
-+				 (0x1 << 11) |	/* SPI master mode */
-+				 (0x0 << 12) |	/* disable SPI loopback mode */
-+				 (0x1 << 13) |	/* clock phase */
-+				 (0x1 << 14) |	/* clock polarity */
-+				 (0x0 << 24) |	/* disable - SPI data swap */
-+				 (0x1 << 29) |	/* enable - 2IO Read mode */
-+				 (0x0 << 30) |	/* disable - SPI high speed read for system boot up */
-+				 (0x0 << 31));	/* disable - SPI */
-+
-+	/* Set SPI bit rate PCLK/2 */
-+	SPI_BIT_RATE_CONTROL_REG = 0x1;
-+
-+	/* Set SPI Tx channel 0 */
-+	SPI_TRANSMIT_CONTROL_REG = 0x0;
-+
-+	/* Set Tx FIFO Threshold, Tx FIFO has 2 words */
-+	SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4);
-+	SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4);
-+
-+	/* Set Rx FIFO Threshold, Rx FIFO has 2 words */
-+	SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4);
-+	SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4);
-+
-+	/* Disable all interrupt */
-+	SPI_INTERRUPT_ENABLE_REG = 0x0;
-+
-+	/* Clear spurious interrupt sources */
-+	SPI_INTERRUPT_STATUS_REG = (0x0F << 4);
-+
-+	/* Enable SPI */
-+	SPI_CONFIGURATION_REG |= (0x1 << 31);
-+
-+	return;
-+}
-+
-+static int __devinit cns3xxx_spi_probe(struct platform_device *pdev)
-+{
-+	struct spi_master *master;
-+	struct cns3xxx_spi *hw;
-+	int err = 0;
-+
-+	printk("%s: setup CNS3XXX SPI Controller\n", __FUNCTION__);
-+
-+	/* Allocate master with space for cns3xxx_spi */
-+	master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi));
-+	if (master == NULL) {
-+		dev_err(&pdev->dev, "No memory for spi_master\n");
-+		err = -ENOMEM;
-+		goto err_nomem;
-+	}
-+
-+	hw = spi_master_get_devdata(master);
-+	memset(hw, 0, sizeof(struct cns3xxx_spi));
-+
-+	hw->master = spi_master_get(master);
-+	hw->dev = &pdev->dev;
-+
-+	platform_set_drvdata(pdev, hw);
-+	init_completion(&hw->done);
-+
-+	/* setup the master state. */
-+
-+	master->num_chipselect = 4;
-+	master->bus_num = 1;
-+
-+	/* setup the state for the bitbang driver */
-+
-+	hw->bitbang.master = hw->master;
-+	hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer;
-+	hw->bitbang.chipselect = cns3xxx_spi_chipselect;
-+	hw->bitbang.txrx_bufs = cns3xxx_spi_txrx;
-+	hw->bitbang.master->setup = cns3xxx_spi_setup;
-+
-+	dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
-+
-+	/* SPI controller initializations */
-+	cns3xxx_spi_initial();
-+
-+	/* register SPI controller */
-+
-+	err = spi_bitbang_start(&hw->bitbang);
-+	if (err) {
-+		dev_err(&pdev->dev, "Failed to register SPI master\n");
-+		goto err_register;
-+	}
-+
-+	return 0;
-+
-+err_register:
-+	spi_master_put(hw->master);;
-+
-+err_nomem:
-+	return err;
-+}
-+
-+static int __devexit cns3xxx_spi_remove(struct platform_device *dev)
-+{
-+	struct cns3xxx_spi *hw = platform_get_drvdata(dev);
-+
-+	platform_set_drvdata(dev, NULL);
-+
-+	spi_unregister_master(hw->master);
-+
-+	spi_master_put(hw->master);
-+	return 0;
-+}
-+
-+#ifdef CONFIG_PM
-+
-+static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
-+{
-+	struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
-+
-+	return 0;
-+}
-+
-+static int cns3xxx_spi_resume(struct platform_device *pdev)
-+{
-+	struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
-+
-+	return 0;
-+}
-+
-+#else
-+#define cns3xxx_spi_suspend	NULL
-+#define cns3xxx_spi_resume	NULL
-+#endif
-+
-+static struct platform_driver cns3xxx_spi_driver = {
-+	.probe		= cns3xxx_spi_probe,
-+	.remove		= __devexit_p(cns3xxx_spi_remove),
-+	.suspend	= cns3xxx_spi_suspend,
-+	.resume		= cns3xxx_spi_resume,
-+	.driver		= {
-+		.name = "cns3xxx_spi",
-+		.owner = THIS_MODULE,
-+	},
-+};
-+
-+static int __init cns3xxx_spi_init(void)
-+{
-+	return platform_driver_register(&cns3xxx_spi_driver);
-+}
-+
-+static void __exit cns3xxx_spi_exit(void)
-+{
-+	platform_driver_unregister(&cns3xxx_spi_driver);
-+}
-+
-+module_init(cns3xxx_spi_init);
-+module_exit(cns3xxx_spi_exit);
-+
-+MODULE_AUTHOR("Cavium Networks");
-+MODULE_DESCRIPTION("CNS3XXX SPI Controller Driver");
-+MODULE_LICENSE("GPL");
-+MODULE_ALIAS("platform:cns3xxx_spi");
-+
-+EXPORT_SYMBOL_GPL(cns3xxx_spi_tx_rx);
---- a/include/linux/spi/spi.h
-+++ b/include/linux/spi/spi.h
-@@ -508,6 +508,13 @@ struct spi_transfer {
- 	u32		speed_hz;
- 
- 	struct list_head transfer_list;
-+
-+#ifdef CONFIG_ARCH_CNS3XXX
-+	unsigned	last_in_message_list;
-+#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
-+	u8		dio_read;
-+#endif
-+#endif
- };
- 
- /**
 --- a/drivers/spi/spi-bitbang.c
 +++ b/drivers/spi/spi-bitbang.c
 @@ -330,6 +330,12 @@ static void bitbang_work(struct work_str