* [PATCH] Add spi controller driver for w90p910
@ 2009-07-22 10:32 Wan ZongShun
[not found] ` <4A66EAC2.1040603-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Wan ZongShun @ 2009-07-22 10:32 UTC (permalink / raw)
To: David Brownell, David Brownell-sourceforge, linux-arm-kernel,
linux-spi <spi-devel-
Dear David,
Add w90p910 spi controller driver support, on my evaluation
board,there is a winbond w25x16 spi flash, so I test my
spi controller driver with m25p80.c.
Signed-off-by: Wan ZongShun <mcuos.com-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
arch/arm/mach-w90x900/include/mach/w90p910_spi.h | 35 ++
drivers/spi/Kconfig | 7 +
drivers/spi/Makefile | 1 +
drivers/spi/spi_w90p910.c | 458 ++++++++++++++++++++++
4 files changed, 501 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-w90x900/include/mach/w90p910_spi.h
create mode 100644 drivers/spi/spi_w90p910.c
diff --git a/arch/arm/mach-w90x900/include/mach/w90p910_spi.h b/arch/arm/mach-w90x900/include/mach/w90p910_spi.h
new file mode 100644
index 0000000..1ac7e3e
--- /dev/null
+++ b/arch/arm/mach-w90x900/include/mach/w90p910_spi.h
@@ -0,0 +1,35 @@
+/*
+ * arch/arm/mach-w90x900/include/mach/w90p910_spi.h
+ *
+ * Copyright (c) 2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#ifndef __ASM_ARCH_SPI_H
+#define __ASM_ARCH_SPI_H
+
+extern void mfp_set_groupg(struct device *dev);
+
+struct w90p910_spi_info {
+ unsigned int num_cs;
+ unsigned int lsb;
+ unsigned int txneg;
+ unsigned int rxneg;
+ unsigned int divider;
+ unsigned int sleep;
+ unsigned int txnum;
+ unsigned int txbitlen;
+ int bus_num;
+};
+
+struct w90p910_spi_chip {
+ unsigned char bits_per_word;
+};
+
+#endif /* __ASM_ARCH_SPI_H */
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 2c733c2..e9a73d2 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -227,6 +227,13 @@ config SPI_XILINX
See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
Product Specification document (DS464) for hardware details.
+config SPI_W90P910
+ tristate "Nuvoton W90X900 series SPI"
+ depends on ARCH_W90X900 && EXPERIMENTAL
+ select SPI_BITBANG
+ help
+ SPI driver for Nuvoton W90X900 series ARM SoCs
+
#
# Add new SPI master controllers in alphabetical order above this line
#
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 3de408d..1ac4d26 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o
obj-$(CONFIG_SPI_TXX9) += spi_txx9.o
obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o
obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o
+obj-$(CONFIG_SPI_W90P910) += spi_w90p910.o
# ... add above this line ...
# SPI protocol drivers (device/link on bus)
diff --git a/drivers/spi/spi_w90p910.c b/drivers/spi/spi_w90p910.c
new file mode 100644
index 0000000..8562504
--- /dev/null
+++ b/drivers/spi/spi_w90p910.c
@@ -0,0 +1,458 @@
+/* linux/drivers/spi/spi_w90p910.c
+ *
+ * Copyright (c) 2009 Nuvoton technology.
+ * Wan ZongShun <mcuos.com-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * This program 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.
+ *
+*/
+
+#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/device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+
+#include <mach/w90p910_spi.h>
+
+/* usi registers offset */
+#define USI_CNT 0x00
+#define USI_DIV 0x04
+#define USI_SSR 0x08
+#define USI_RX0 0x10
+#define USI_TX0 0x10
+
+/* usi register bit */
+#define ENINT (0x01 << 17)
+#define ENFLG (0x01 << 16)
+#define TXNUM (0x03 << 8)
+#define TXNEG (0x01 << 2)
+#define RXNEG (0x01 << 1)
+#define LSB (0x01 << 10)
+#define SELECTLEV (0x01 << 2)
+#define SELECTPOL (0x01 << 31)
+#define SELECTSLAVE 0x01
+#define GOBUSY 0x01
+
+struct w90p910_spi {
+ struct spi_bitbang bitbang;
+ struct completion done;
+ void __iomem *regs;
+ int irq;
+ int len;
+ int count;
+ const unsigned char *tx;
+ unsigned char *rx;
+ struct clk *clk;
+ struct resource *ioarea;
+ struct spi_master *master;
+ struct spi_device *curdev;
+ struct device *dev;
+ struct w90p910_spi_info *pdata;
+};
+
+static inline struct w90p910_spi *to_hw(struct spi_device *sdev)
+{
+ return spi_master_get_devdata(sdev->master);
+}
+
+static void w90p910_slave_seclect(struct spi_device *spi, unsigned int ssr)
+{
+ struct w90p910_spi *hw = to_hw(spi);
+ unsigned int val;
+ unsigned int cs = spi->mode & SPI_CS_HIGH ? 1 : 0;
+ unsigned int cpol = spi->mode & SPI_CPOL ? 1 : 0;
+
+ val = __raw_readl(hw->regs + USI_SSR);
+
+ if (!cs)
+ val &= ~SELECTLEV;
+ else
+ val |= SELECTLEV;
+
+ if (!ssr)
+ val &= ~SELECTSLAVE;
+ else
+ val |= SELECTSLAVE;
+
+ __raw_writel(val, hw->regs + USI_SSR);
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ if (!cpol)
+ val &= ~SELECTPOL;
+ else
+ val |= SELECTPOL;
+
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_spi_chipsel(struct spi_device *spi, int value)
+{
+ switch (value) {
+ case BITBANG_CS_INACTIVE:
+ w90p910_slave_seclect(spi, 0);
+ break;
+
+ case BITBANG_CS_ACTIVE:
+ w90p910_slave_seclect(spi, 1);
+ break;
+ }
+}
+
+static void w90p910_spi_setup_txnum(struct w90p910_spi *hw,
+ unsigned int txnum)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ if (!txnum)
+ val &= ~TXNUM;
+ else
+ val |= txnum << 0x08;
+
+ __raw_writel(val, hw->regs + USI_CNT);
+
+}
+
+static void w90p910_spi_setup_txbitlen(struct w90p910_spi *hw,
+ unsigned int txbitlen)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ val |= (txbitlen << 0x03);
+
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_spi_gobusy(struct w90p910_spi *hw)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ val |= GOBUSY;
+
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static int w90p910_spi_setupxfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ return 0;
+}
+
+static int w90p910_spi_setup(struct spi_device *spi)
+{
+ return 0;
+}
+
+static inline unsigned int hw_txbyte(struct w90p910_spi *hw, int count)
+{
+ return hw->tx ? hw->tx[count] : 0;
+}
+
+static int w90p910_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct w90p910_spi *hw = to_hw(spi);
+
+ hw->tx = t->tx_buf;
+ hw->rx = t->rx_buf;
+ hw->len = t->len;
+ hw->count = 0;
+
+ init_completion(&hw->done);
+
+ __raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0);
+
+ w90p910_spi_gobusy(hw);
+
+ wait_for_completion(&hw->done);
+
+ return hw->count;
+}
+
+static irqreturn_t w90p910_spi_irq(int irq, void *dev)
+{
+ struct w90p910_spi *hw = dev;
+ unsigned int status;
+ unsigned int count = hw->count;
+
+ status = __raw_readl(hw->regs + USI_CNT);
+ __raw_writel(status, hw->regs + USI_CNT);
+
+ if (status & ENFLG) {
+ hw->count++;
+
+ if (hw->rx)
+ hw->rx[count] = __raw_readl(hw->regs + USI_RX0);
+ count++;
+
+ if (count < hw->len) {
+ __raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0);
+ w90p910_spi_gobusy(hw);
+ } else {
+ complete(&hw->done);
+ }
+
+ return IRQ_HANDLED;
+ }
+
+ complete(&hw->done);
+ return IRQ_HANDLED;
+}
+
+static void w90p910_tx_edge(struct w90p910_spi *hw, unsigned int edge)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ if (edge)
+ val |= TXNEG;
+ else
+ val &= ~TXNEG;
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_rx_edge(struct w90p910_spi *hw, unsigned int edge)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ if (edge)
+ val |= RXNEG;
+ else
+ val &= ~RXNEG;
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_send_first(struct w90p910_spi *hw, unsigned int lsb)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ if (lsb)
+ val |= LSB;
+ else
+ val &= ~LSB;
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_set_sleep(struct w90p910_spi *hw, unsigned int sleep)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ if (sleep)
+ val |= (sleep << 12);
+ else
+ val &= ~(0x0f << 12);
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_enable_int(struct w90p910_spi *hw)
+{
+ unsigned int val;
+
+ val = __raw_readl(hw->regs + USI_CNT);
+
+ val |= ENINT;
+
+ __raw_writel(val, hw->regs + USI_CNT);
+}
+
+static void w90p910_set_divider(struct w90p910_spi *hw)
+{
+ __raw_writel(hw->pdata->divider, hw->regs + USI_DIV);
+}
+
+static void w90p910_init_spi(struct w90p910_spi *hw)
+{
+ clk_enable(hw->clk);
+
+ w90p910_tx_edge(hw, hw->pdata->txneg);
+ w90p910_rx_edge(hw, hw->pdata->rxneg);
+ w90p910_send_first(hw, hw->pdata->lsb);
+ w90p910_set_sleep(hw, hw->pdata->sleep);
+ w90p910_spi_setup_txbitlen(hw, hw->pdata->txbitlen);
+ w90p910_spi_setup_txnum(hw, hw->pdata->txnum);
+ w90p910_set_divider(hw);
+ w90p910_enable_int(hw);
+}
+
+static int __devinit w90p910_spi_probe(struct platform_device *pdev)
+{
+ struct w90p910_spi *hw;
+ struct spi_master *master;
+ struct resource *res;
+ int err = 0;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(struct w90p910_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 w90p910_spi));
+
+ hw->master = spi_master_get(master);
+ hw->pdata = pdev->dev.platform_data;
+ hw->dev = &pdev->dev;
+
+ if (hw->pdata == NULL) {
+ dev_err(&pdev->dev, "No platform data supplied\n");
+ err = -ENOENT;
+ goto err_pdata;
+ }
+
+ platform_set_drvdata(pdev, hw);
+ init_completion(&hw->done);
+
+ master->mode_bits = SPI_MODE_0;
+ master->num_chipselect = hw->pdata->num_cs;
+ master->bus_num = hw->pdata->bus_num;
+ hw->bitbang.master = hw->master;
+ hw->bitbang.setup_transfer = w90p910_spi_setupxfer;
+ hw->bitbang.chipselect = w90p910_spi_chipsel;
+ hw->bitbang.txrx_bufs = w90p910_spi_txrx;
+ hw->bitbang.master->setup = w90p910_spi_setup;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+ err = -ENOENT;
+ goto err_pdata;
+ }
+
+ hw->ioarea = request_mem_region(res->start,
+ resource_size(res), pdev->name);
+
+ if (hw->ioarea == NULL) {
+ dev_err(&pdev->dev, "Cannot reserve region\n");
+ err = -ENXIO;
+ goto err_pdata;
+ }
+
+ hw->regs = ioremap(res->start, resource_size(res));
+ if (hw->regs == NULL) {
+ dev_err(&pdev->dev, "Cannot map IO\n");
+ err = -ENXIO;
+ goto err_iomap;
+ }
+
+ hw->irq = platform_get_irq(pdev, 0);
+ if (hw->irq < 0) {
+ dev_err(&pdev->dev, "No IRQ specified\n");
+ err = -ENOENT;
+ goto err_irq;
+ }
+
+ err = request_irq(hw->irq, w90p910_spi_irq, 0, pdev->name, hw);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot claim IRQ\n");
+ goto err_irq;
+ }
+
+ hw->clk = clk_get(&pdev->dev, "spi");
+ if (IS_ERR(hw->clk)) {
+ dev_err(&pdev->dev, "No clock for device\n");
+ err = PTR_ERR(hw->clk);
+ goto err_clk;
+ }
+
+ mfp_set_groupg(&pdev->dev);
+ w90p910_init_spi(hw);
+
+ 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:
+ clk_disable(hw->clk);
+ clk_put(hw->clk);
+err_clk:
+ free_irq(hw->irq, hw);
+err_irq:
+ iounmap(hw->regs);
+err_iomap:
+ release_resource(hw->ioarea);
+ kfree(hw->ioarea);
+err_pdata:
+ spi_master_put(hw->master);;
+
+err_nomem:
+ return err;
+}
+
+static int __devexit w90p910_spi_remove(struct platform_device *dev)
+{
+ struct w90p910_spi *hw = platform_get_drvdata(dev);
+
+ platform_set_drvdata(dev, NULL);
+
+ spi_unregister_master(hw->master);
+
+ clk_disable(hw->clk);
+ clk_put(hw->clk);
+
+ free_irq(hw->irq, hw);
+ iounmap(hw->regs);
+
+ release_resource(hw->ioarea);
+ kfree(hw->ioarea);
+
+ spi_master_put(hw->master);
+ return 0;
+}
+
+static struct platform_driver w90p910_spi_driver = {
+ .probe = w90p910_spi_probe,
+ .remove = __devexit_p(w90p910_spi_remove),
+ .driver = {
+ .name = "w90p910-spi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init w90p910_spi_init(void)
+{
+ return platform_driver_register(&w90p910_spi_driver);
+}
+
+static void __exit w90p910_spi_exit(void)
+{
+ platform_driver_unregister(&w90p910_spi_driver);
+}
+
+module_init(w90p910_spi_init);
+module_exit(w90p910_spi_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>");
+MODULE_DESCRIPTION("w90p910 spi driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:w90p910-spi");
--
1.5.6.3
------------------------------------------------------------------------------
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Add spi controller driver for w90p910
[not found] ` <4A66EAC2.1040603-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
@ 2009-08-13 13:37 ` Wan ZongShun
0 siblings, 0 replies; 2+ messages in thread
From: Wan ZongShun @ 2009-08-13 13:37 UTC (permalink / raw)
To: David Brownell, David Brownell-sourceforge, linux-arm-kernel,
linux-spi <spi-devel
HI David,
How about this patch, Could It be merged in 32-rc1?
Thanks!
2009/7/22 Wan ZongShun <mcuos.com@gmail.com>:
> Dear David,
>
> Add w90p910 spi controller driver support, on my evaluation
> board,there is a winbond w25x16 spi flash, so I test my
> spi controller driver with m25p80.c.
>
> Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
> ---
> arch/arm/mach-w90x900/include/mach/w90p910_spi.h | 35 ++
> drivers/spi/Kconfig | 7 +
> drivers/spi/Makefile | 1 +
> drivers/spi/spi_w90p910.c | 458 ++++++++++++++++++++++
> 4 files changed, 501 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-w90x900/include/mach/w90p910_spi.h
> create mode 100644 drivers/spi/spi_w90p910.c
>
> diff --git a/arch/arm/mach-w90x900/include/mach/w90p910_spi.h b/arch/arm/mach-w90x900/include/mach/w90p910_spi.h
> new file mode 100644
> index 0000000..1ac7e3e
> --- /dev/null
> +++ b/arch/arm/mach-w90x900/include/mach/w90p910_spi.h
> @@ -0,0 +1,35 @@
> +/*
> + * arch/arm/mach-w90x900/include/mach/w90p910_spi.h
> + *
> + * Copyright (c) 2009 Nuvoton technology corporation.
> + *
> + * Wan ZongShun <mcuos.com@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation;version 2 of the License.
> + *
> + */
> +
> +#ifndef __ASM_ARCH_SPI_H
> +#define __ASM_ARCH_SPI_H
> +
> +extern void mfp_set_groupg(struct device *dev);
> +
> +struct w90p910_spi_info {
> + unsigned int num_cs;
> + unsigned int lsb;
> + unsigned int txneg;
> + unsigned int rxneg;
> + unsigned int divider;
> + unsigned int sleep;
> + unsigned int txnum;
> + unsigned int txbitlen;
> + int bus_num;
> +};
> +
> +struct w90p910_spi_chip {
> + unsigned char bits_per_word;
> +};
> +
> +#endif /* __ASM_ARCH_SPI_H */
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 2c733c2..e9a73d2 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -227,6 +227,13 @@ config SPI_XILINX
> See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
> Product Specification document (DS464) for hardware details.
>
> +config SPI_W90P910
> + tristate "Nuvoton W90X900 series SPI"
> + depends on ARCH_W90X900 && EXPERIMENTAL
> + select SPI_BITBANG
> + help
> + SPI driver for Nuvoton W90X900 series ARM SoCs
> +
> #
> # Add new SPI master controllers in alphabetical order above this line
> #
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 3de408d..1ac4d26 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o
> obj-$(CONFIG_SPI_TXX9) += spi_txx9.o
> obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o
> obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o
> +obj-$(CONFIG_SPI_W90P910) += spi_w90p910.o
> # ... add above this line ...
>
> # SPI protocol drivers (device/link on bus)
> diff --git a/drivers/spi/spi_w90p910.c b/drivers/spi/spi_w90p910.c
> new file mode 100644
> index 0000000..8562504
> --- /dev/null
> +++ b/drivers/spi/spi_w90p910.c
> @@ -0,0 +1,458 @@
> +/* linux/drivers/spi/spi_w90p910.c
> + *
> + * Copyright (c) 2009 Nuvoton technology.
> + * Wan ZongShun <mcuos.com@gmail.com>
> + *
> + * This program 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.
> + *
> +*/
> +
> +#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/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/gpio.h>
> +#include <linux/io.h>
> +
> +#include <linux/spi/spi.h>
> +#include <linux/spi/spi_bitbang.h>
> +
> +#include <mach/w90p910_spi.h>
> +
> +/* usi registers offset */
> +#define USI_CNT 0x00
> +#define USI_DIV 0x04
> +#define USI_SSR 0x08
> +#define USI_RX0 0x10
> +#define USI_TX0 0x10
> +
> +/* usi register bit */
> +#define ENINT (0x01 << 17)
> +#define ENFLG (0x01 << 16)
> +#define TXNUM (0x03 << 8)
> +#define TXNEG (0x01 << 2)
> +#define RXNEG (0x01 << 1)
> +#define LSB (0x01 << 10)
> +#define SELECTLEV (0x01 << 2)
> +#define SELECTPOL (0x01 << 31)
> +#define SELECTSLAVE 0x01
> +#define GOBUSY 0x01
> +
> +struct w90p910_spi {
> + struct spi_bitbang bitbang;
> + struct completion done;
> + void __iomem *regs;
> + int irq;
> + int len;
> + int count;
> + const unsigned char *tx;
> + unsigned char *rx;
> + struct clk *clk;
> + struct resource *ioarea;
> + struct spi_master *master;
> + struct spi_device *curdev;
> + struct device *dev;
> + struct w90p910_spi_info *pdata;
> +};
> +
> +static inline struct w90p910_spi *to_hw(struct spi_device *sdev)
> +{
> + return spi_master_get_devdata(sdev->master);
> +}
> +
> +static void w90p910_slave_seclect(struct spi_device *spi, unsigned int ssr)
> +{
> + struct w90p910_spi *hw = to_hw(spi);
> + unsigned int val;
> + unsigned int cs = spi->mode & SPI_CS_HIGH ? 1 : 0;
> + unsigned int cpol = spi->mode & SPI_CPOL ? 1 : 0;
> +
> + val = __raw_readl(hw->regs + USI_SSR);
> +
> + if (!cs)
> + val &= ~SELECTLEV;
> + else
> + val |= SELECTLEV;
> +
> + if (!ssr)
> + val &= ~SELECTSLAVE;
> + else
> + val |= SELECTSLAVE;
> +
> + __raw_writel(val, hw->regs + USI_SSR);
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + if (!cpol)
> + val &= ~SELECTPOL;
> + else
> + val |= SELECTPOL;
> +
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_spi_chipsel(struct spi_device *spi, int value)
> +{
> + switch (value) {
> + case BITBANG_CS_INACTIVE:
> + w90p910_slave_seclect(spi, 0);
> + break;
> +
> + case BITBANG_CS_ACTIVE:
> + w90p910_slave_seclect(spi, 1);
> + break;
> + }
> +}
> +
> +static void w90p910_spi_setup_txnum(struct w90p910_spi *hw,
> + unsigned int txnum)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + if (!txnum)
> + val &= ~TXNUM;
> + else
> + val |= txnum << 0x08;
> +
> + __raw_writel(val, hw->regs + USI_CNT);
> +
> +}
> +
> +static void w90p910_spi_setup_txbitlen(struct w90p910_spi *hw,
> + unsigned int txbitlen)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + val |= (txbitlen << 0x03);
> +
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_spi_gobusy(struct w90p910_spi *hw)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + val |= GOBUSY;
> +
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static int w90p910_spi_setupxfer(struct spi_device *spi,
> + struct spi_transfer *t)
> +{
> + return 0;
> +}
> +
> +static int w90p910_spi_setup(struct spi_device *spi)
> +{
> + return 0;
> +}
> +
> +static inline unsigned int hw_txbyte(struct w90p910_spi *hw, int count)
> +{
> + return hw->tx ? hw->tx[count] : 0;
> +}
> +
> +static int w90p910_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
> +{
> + struct w90p910_spi *hw = to_hw(spi);
> +
> + hw->tx = t->tx_buf;
> + hw->rx = t->rx_buf;
> + hw->len = t->len;
> + hw->count = 0;
> +
> + init_completion(&hw->done);
> +
> + __raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0);
> +
> + w90p910_spi_gobusy(hw);
> +
> + wait_for_completion(&hw->done);
> +
> + return hw->count;
> +}
> +
> +static irqreturn_t w90p910_spi_irq(int irq, void *dev)
> +{
> + struct w90p910_spi *hw = dev;
> + unsigned int status;
> + unsigned int count = hw->count;
> +
> + status = __raw_readl(hw->regs + USI_CNT);
> + __raw_writel(status, hw->regs + USI_CNT);
> +
> + if (status & ENFLG) {
> + hw->count++;
> +
> + if (hw->rx)
> + hw->rx[count] = __raw_readl(hw->regs + USI_RX0);
> + count++;
> +
> + if (count < hw->len) {
> + __raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0);
> + w90p910_spi_gobusy(hw);
> + } else {
> + complete(&hw->done);
> + }
> +
> + return IRQ_HANDLED;
> + }
> +
> + complete(&hw->done);
> + return IRQ_HANDLED;
> +}
> +
> +static void w90p910_tx_edge(struct w90p910_spi *hw, unsigned int edge)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + if (edge)
> + val |= TXNEG;
> + else
> + val &= ~TXNEG;
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_rx_edge(struct w90p910_spi *hw, unsigned int edge)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + if (edge)
> + val |= RXNEG;
> + else
> + val &= ~RXNEG;
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_send_first(struct w90p910_spi *hw, unsigned int lsb)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + if (lsb)
> + val |= LSB;
> + else
> + val &= ~LSB;
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_set_sleep(struct w90p910_spi *hw, unsigned int sleep)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + if (sleep)
> + val |= (sleep << 12);
> + else
> + val &= ~(0x0f << 12);
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_enable_int(struct w90p910_spi *hw)
> +{
> + unsigned int val;
> +
> + val = __raw_readl(hw->regs + USI_CNT);
> +
> + val |= ENINT;
> +
> + __raw_writel(val, hw->regs + USI_CNT);
> +}
> +
> +static void w90p910_set_divider(struct w90p910_spi *hw)
> +{
> + __raw_writel(hw->pdata->divider, hw->regs + USI_DIV);
> +}
> +
> +static void w90p910_init_spi(struct w90p910_spi *hw)
> +{
> + clk_enable(hw->clk);
> +
> + w90p910_tx_edge(hw, hw->pdata->txneg);
> + w90p910_rx_edge(hw, hw->pdata->rxneg);
> + w90p910_send_first(hw, hw->pdata->lsb);
> + w90p910_set_sleep(hw, hw->pdata->sleep);
> + w90p910_spi_setup_txbitlen(hw, hw->pdata->txbitlen);
> + w90p910_spi_setup_txnum(hw, hw->pdata->txnum);
> + w90p910_set_divider(hw);
> + w90p910_enable_int(hw);
> +}
> +
> +static int __devinit w90p910_spi_probe(struct platform_device *pdev)
> +{
> + struct w90p910_spi *hw;
> + struct spi_master *master;
> + struct resource *res;
> + int err = 0;
> +
> + master = spi_alloc_master(&pdev->dev, sizeof(struct w90p910_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 w90p910_spi));
> +
> + hw->master = spi_master_get(master);
> + hw->pdata = pdev->dev.platform_data;
> + hw->dev = &pdev->dev;
> +
> + if (hw->pdata == NULL) {
> + dev_err(&pdev->dev, "No platform data supplied\n");
> + err = -ENOENT;
> + goto err_pdata;
> + }
> +
> + platform_set_drvdata(pdev, hw);
> + init_completion(&hw->done);
> +
> + master->mode_bits = SPI_MODE_0;
> + master->num_chipselect = hw->pdata->num_cs;
> + master->bus_num = hw->pdata->bus_num;
> + hw->bitbang.master = hw->master;
> + hw->bitbang.setup_transfer = w90p910_spi_setupxfer;
> + hw->bitbang.chipselect = w90p910_spi_chipsel;
> + hw->bitbang.txrx_bufs = w90p910_spi_txrx;
> + hw->bitbang.master->setup = w90p910_spi_setup;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (res == NULL) {
> + dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
> + err = -ENOENT;
> + goto err_pdata;
> + }
> +
> + hw->ioarea = request_mem_region(res->start,
> + resource_size(res), pdev->name);
> +
> + if (hw->ioarea == NULL) {
> + dev_err(&pdev->dev, "Cannot reserve region\n");
> + err = -ENXIO;
> + goto err_pdata;
> + }
> +
> + hw->regs = ioremap(res->start, resource_size(res));
> + if (hw->regs == NULL) {
> + dev_err(&pdev->dev, "Cannot map IO\n");
> + err = -ENXIO;
> + goto err_iomap;
> + }
> +
> + hw->irq = platform_get_irq(pdev, 0);
> + if (hw->irq < 0) {
> + dev_err(&pdev->dev, "No IRQ specified\n");
> + err = -ENOENT;
> + goto err_irq;
> + }
> +
> + err = request_irq(hw->irq, w90p910_spi_irq, 0, pdev->name, hw);
> + if (err) {
> + dev_err(&pdev->dev, "Cannot claim IRQ\n");
> + goto err_irq;
> + }
> +
> + hw->clk = clk_get(&pdev->dev, "spi");
> + if (IS_ERR(hw->clk)) {
> + dev_err(&pdev->dev, "No clock for device\n");
> + err = PTR_ERR(hw->clk);
> + goto err_clk;
> + }
> +
> + mfp_set_groupg(&pdev->dev);
> + w90p910_init_spi(hw);
> +
> + 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:
> + clk_disable(hw->clk);
> + clk_put(hw->clk);
> +err_clk:
> + free_irq(hw->irq, hw);
> +err_irq:
> + iounmap(hw->regs);
> +err_iomap:
> + release_resource(hw->ioarea);
> + kfree(hw->ioarea);
> +err_pdata:
> + spi_master_put(hw->master);;
> +
> +err_nomem:
> + return err;
> +}
> +
> +static int __devexit w90p910_spi_remove(struct platform_device *dev)
> +{
> + struct w90p910_spi *hw = platform_get_drvdata(dev);
> +
> + platform_set_drvdata(dev, NULL);
> +
> + spi_unregister_master(hw->master);
> +
> + clk_disable(hw->clk);
> + clk_put(hw->clk);
> +
> + free_irq(hw->irq, hw);
> + iounmap(hw->regs);
> +
> + release_resource(hw->ioarea);
> + kfree(hw->ioarea);
> +
> + spi_master_put(hw->master);
> + return 0;
> +}
> +
> +static struct platform_driver w90p910_spi_driver = {
> + .probe = w90p910_spi_probe,
> + .remove = __devexit_p(w90p910_spi_remove),
> + .driver = {
> + .name = "w90p910-spi",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init w90p910_spi_init(void)
> +{
> + return platform_driver_register(&w90p910_spi_driver);
> +}
> +
> +static void __exit w90p910_spi_exit(void)
> +{
> + platform_driver_unregister(&w90p910_spi_driver);
> +}
> +
> +module_init(w90p910_spi_init);
> +module_exit(w90p910_spi_exit);
> +
> +MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
> +MODULE_DESCRIPTION("w90p910 spi driver!");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:w90p910-spi");
> --
> 1.5.6.3
>
--
Wan z.s
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end of thread, other threads:[~2009-08-13 13:37 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-07-22 10:32 [PATCH] Add spi controller driver for w90p910 Wan ZongShun
[not found] ` <4A66EAC2.1040603-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2009-08-13 13:37 ` Wan ZongShun
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