From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-bw0-f49.google.com ([209.85.214.49]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QyHu0-0005ks-4m for barebox@lists.infradead.org; Tue, 30 Aug 2011 06:34:29 +0000 Received: by bke17 with SMTP id 17so5551226bke.36 for ; Mon, 29 Aug 2011 23:34:25 -0700 (PDT) Message-Id: <6a487d727c7d0e29b35276f5780fd91e116f79d8.1314685868.git.fercerpav@gmail.com> In-Reply-To: <3c14dbb81191e6dcf1ecc7ef799834f52ad5f10a.1314685868.git.fercerpav@gmail.com> References: <3c14dbb81191e6dcf1ecc7ef799834f52ad5f10a.1314685868.git.fercerpav@gmail.com> From: Paul Fertser Date: Tue, 30 Aug 2011 10:30:51 +0400 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/2] imx25: imx_spi: support CSPI v0.7 as found on i.MX25 To: barebox@lists.infradead.org Based on the Linux driver. Barely tested with m25p80 with CS in GPIO mode. Currently always using the slowest speed. Signed-off-by: Paul Fertser --- arch/arm/mach-imx/include/mach/devices-imx25.h | 5 + arch/arm/mach-imx/include/mach/imx25-regs.h | 1 + drivers/spi/Kconfig | 5 + drivers/spi/imx_spi.c | 115 ++++++++++++++++++++++++ 4 files changed, 126 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-imx/include/mach/devices-imx25.h b/arch/arm/mach-imx/include/mach/devices-imx25.h index 87f5ba0..eff5977 100644 --- a/arch/arm/mach-imx/include/mach/devices-imx25.h +++ b/arch/arm/mach-imx/include/mach/devices-imx25.h @@ -6,6 +6,11 @@ static inline struct device_d *imx25_add_i2c0(struct i2c_platform_data *pdata) return imx_add_i2c((void *)IMX_I2C1_BASE, 0, pdata); } +static inline struct device_d *imx25_add_spi0(struct spi_imx_master *pdata) +{ + return imx_add_spi((void *)IMX_CSPI1_BASE, 0, pdata); +} + static inline struct device_d *imx25_add_uart0(void) { return imx_add_uart((void *)IMX_UART1_BASE, 0); diff --git a/arch/arm/mach-imx/include/mach/imx25-regs.h b/arch/arm/mach-imx/include/mach/imx25-regs.h index 78ec0cd..73307c4 100644 --- a/arch/arm/mach-imx/include/mach/imx25-regs.h +++ b/arch/arm/mach-imx/include/mach/imx25-regs.h @@ -47,6 +47,7 @@ #define IMX_NFC_BASE 0xBB000000 #define IMX_FEC_BASE 0x50038000 #define IMX_I2C1_BASE 0x43F80000 +#define IMX_CSPI1_BASE 0x43FA4000 /* * Clock Controller Module (CCM) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index c72493c..94470fe 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -14,6 +14,11 @@ config DRIVER_SPI_IMX_0_0 depends on ARCH_IMX27 default y +config DRIVER_SPI_IMX_0_7 + bool + depends on ARCH_IMX25 + default y + config DRIVER_SPI_IMX_2_3 bool depends on ARCH_IMX51 || ARCH_IMX53 diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c index 0d21fb3..3050efc 100644 --- a/drivers/spi/imx_spi.c +++ b/drivers/spi/imx_spi.c @@ -65,6 +65,22 @@ #define CSPI_0_0_TEST_LBC (1 << 14) +#define CSPI_0_7_RXDATA 0x00 +#define CSPI_0_7_TXDATA 0x04 +#define CSPI_0_7_CTRL 0x08 +#define CSPI_0_7_CTRL_ENABLE (1 << 0) +#define CSPI_0_7_CTRL_MASTER (1 << 1) +#define CSPI_0_7_CTRL_XCH (1 << 2) +#define CSPI_0_7_CTRL_POL (1 << 4) +#define CSPI_0_7_CTRL_PHA (1 << 5) +#define CSPI_0_7_CTRL_SSCTL (1 << 6) +#define CSPI_0_7_CTRL_SSPOL (1 << 7) +#define CSPI_0_7_CTRL_CS_SHIFT 12 +#define CSPI_0_7_CTRL_DR_SHIFT 16 +#define CSPI_0_7_CTRL_BL_SHIFT 20 +#define CSPI_0_7_STAT 0x14 +#define CSPI_0_7_STAT_RR (1 << 3) + #define CSPI_2_3_RXDATA 0x00 #define CSPI_2_3_TXDATA 0x04 #define CSPI_2_3_CTRL 0x08 @@ -206,6 +222,94 @@ static void cspi_0_0_init(struct imx_spi *imx) } #endif +#ifdef CONFIG_DRIVER_SPI_IMX_0_7 +static unsigned int cspi_0_7_xchg_single(struct imx_spi *imx, unsigned int data) +{ + void __iomem *base = imx->regs; + + unsigned int cfg_reg = readl(base + CSPI_0_7_CTRL); + + writel(data, base + CSPI_0_7_TXDATA); + + cfg_reg |= CSPI_0_7_CTRL_XCH; + + writel(cfg_reg, base + CSPI_0_7_CTRL); + + while (!(readl(base + CSPI_0_7_STAT) & CSPI_0_7_STAT_RR)) + ; + + return readl(base + CSPI_0_7_RXDATA); +} + +#if 0 +/* MX1, MX31, MX35, MX51 CSPI */ +static unsigned int spi_imx_clkdiv_2(unsigned int fin, + unsigned int fspi) +{ + int i, div = 4; + + for (i = 0; i < 7; i++) { + if (fspi * div >= fin) + return i; + div <<= 1; + } + + return 7; +} +#endif + +static void cspi_0_7_chipselect(struct spi_device *spi, int is_active) +{ + struct spi_master *master = spi->master; + struct imx_spi *imx = container_of(master, struct imx_spi, master); + void __iomem *base = imx->regs; + unsigned int cs = 0; + int gpio = imx->cs_array[spi->chip_select]; + unsigned int reg = CSPI_0_7_CTRL_ENABLE | CSPI_0_7_CTRL_MASTER; + + if (spi->mode & SPI_CS_HIGH) + cs = 1; + + if (!is_active) { + if (gpio >= 0) + gpio_set_value(gpio, !cs); + return; + } + +#if 0 + reg |= spi_imx_clkdiv_2(166000000, spi->max_speed_hz) << + CSPI_0_7_CTRL_DR_SHIFT; +#endif + reg |= 7 << CSPI_0_7_CTRL_DR_SHIFT; /* slowest speed */ + + reg |= (spi->bits_per_word - 1) << CSPI_0_7_CTRL_BL_SHIFT; + reg |= CSPI_0_7_CTRL_SSCTL; + + if (spi->mode & SPI_CPHA) + reg |= CSPI_0_7_CTRL_PHA; + if (spi->mode & SPI_CPOL) + reg |= CSPI_0_7_CTRL_POL; + if (spi->mode & SPI_CS_HIGH) + reg |= CSPI_0_7_CTRL_SSPOL; + if (gpio < 0) + reg |= (gpio + 32) << CSPI_0_7_CTRL_CS_SHIFT; + + writel(reg, base + CSPI_0_7_CTRL); + + if (gpio >= 0) + gpio_set_value(gpio, cs); +} + +static void cspi_0_7_init(struct imx_spi *imx) +{ + void __iomem *base = imx->regs; + + /* drain receive buffer */ + while (readl(base + CSPI_0_7_STAT) & CSPI_0_7_STAT_RR) + readl(base + CSPI_0_7_RXDATA); +} +#endif + #ifdef CONFIG_DRIVER_SPI_IMX_2_3 static unsigned int cspi_2_3_xchg_single(struct imx_spi *imx, unsigned int data) { @@ -375,6 +479,13 @@ static struct spi_imx_devtype_data spi_imx_devtype_data[] = { .init = cspi_0_0_init, }, #endif +#ifdef CONFIG_DRIVER_SPI_IMX_0_7 + [SPI_IMX_VER_0_7] = { + .chipselect = cspi_0_7_chipselect, + .xchg_single = cspi_0_7_xchg_single, + .init = cspi_0_7_init, + }, +#endif #ifdef CONFIG_DRIVER_SPI_IMX_2_3 [SPI_IMX_VER_2_3] = { .chipselect = cspi_2_3_chipselect, @@ -405,6 +516,10 @@ static int imx_spi_probe(struct device_d *dev) if (cpu_is_mx27()) version = SPI_IMX_VER_0_0; #endif +#ifdef CONFIG_DRIVER_SPI_IMX_0_7 + if (cpu_is_mx25()) + version = SPI_IMX_VER_0_7; +#endif #ifdef CONFIG_DRIVER_SPI_IMX_2_3 if (cpu_is_mx51() || cpu_is_mx53()) version = SPI_IMX_VER_2_3; -- 1.5.2.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox