From: Uwe Kleine-König Date: Thu, 1 Oct 2009 22:44:28 +0000 (-0700) Subject: spi-imx: rename source file to spi_imx.c X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=6cdeb00218b0d0eaf1329d1e6a0959ee3f0fa14c;p=openwrt%2Fstaging%2Fblogic.git spi-imx: rename source file to spi_imx.c This makes the filename match the Kconfig symbol and the driver name. Signed-off-by: Uwe Kleine-König Cc: Sascha Hauer Cc: David Brownell Cc: Guennadi Liakhovetski Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 6d7a3f82c54b..21a118269cac 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -17,7 +17,7 @@ obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o obj-$(CONFIG_SPI_AU1550) += au1550_spi.o obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o obj-$(CONFIG_SPI_GPIO) += spi_gpio.o -obj-$(CONFIG_SPI_IMX) += mxc_spi.o +obj-$(CONFIG_SPI_IMX) += spi_imx.o obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o obj-$(CONFIG_SPI_OMAP_UWIRE) += omap_uwire.o diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c deleted file mode 100644 index b1447236ae81..000000000000 --- a/drivers/spi/mxc_spi.c +++ /dev/null @@ -1,685 +0,0 @@ -/* - * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. - * Copyright (C) 2008 Juergen Beisert - * - * 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; either version 2 - * of the License, or (at your option) any later version. - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the - * Free Software Foundation - * 51 Franklin Street, Fifth Floor - * Boston, MA 02110-1301, USA. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#define DRIVER_NAME "spi_imx" - -#define MXC_CSPIRXDATA 0x00 -#define MXC_CSPITXDATA 0x04 -#define MXC_CSPICTRL 0x08 -#define MXC_CSPIINT 0x0c -#define MXC_RESET 0x1c - -/* generic defines to abstract from the different register layouts */ -#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */ -#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */ - -struct mxc_spi_config { - unsigned int speed_hz; - unsigned int bpw; - unsigned int mode; - int cs; -}; - -struct mxc_spi_data { - struct spi_bitbang bitbang; - - struct completion xfer_done; - void *base; - int irq; - struct clk *clk; - unsigned long spi_clk; - int *chipselect; - - unsigned int count; - void (*tx)(struct mxc_spi_data *); - void (*rx)(struct mxc_spi_data *); - void *rx_buf; - const void *tx_buf; - unsigned int txfifo; /* number of words pushed in tx FIFO */ - - /* SoC specific functions */ - void (*intctrl)(struct mxc_spi_data *, int); - int (*config)(struct mxc_spi_data *, struct mxc_spi_config *); - void (*trigger)(struct mxc_spi_data *); - int (*rx_available)(struct mxc_spi_data *); -}; - -#define MXC_SPI_BUF_RX(type) \ -static void mxc_spi_buf_rx_##type(struct mxc_spi_data *mxc_spi) \ -{ \ - unsigned int val = readl(mxc_spi->base + MXC_CSPIRXDATA); \ - \ - if (mxc_spi->rx_buf) { \ - *(type *)mxc_spi->rx_buf = val; \ - mxc_spi->rx_buf += sizeof(type); \ - } \ -} - -#define MXC_SPI_BUF_TX(type) \ -static void mxc_spi_buf_tx_##type(struct mxc_spi_data *mxc_spi) \ -{ \ - type val = 0; \ - \ - if (mxc_spi->tx_buf) { \ - val = *(type *)mxc_spi->tx_buf; \ - mxc_spi->tx_buf += sizeof(type); \ - } \ - \ - mxc_spi->count -= sizeof(type); \ - \ - writel(val, mxc_spi->base + MXC_CSPITXDATA); \ -} - -MXC_SPI_BUF_RX(u8) -MXC_SPI_BUF_TX(u8) -MXC_SPI_BUF_RX(u16) -MXC_SPI_BUF_TX(u16) -MXC_SPI_BUF_RX(u32) -MXC_SPI_BUF_TX(u32) - -/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set - * (which is currently not the case in this driver) - */ -static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, - 256, 384, 512, 768, 1024}; - -/* MX21, MX27 */ -static unsigned int mxc_spi_clkdiv_1(unsigned int fin, - unsigned int fspi) -{ - int i, max; - - if (cpu_is_mx21()) - max = 18; - else - max = 16; - - for (i = 2; i < max; i++) - if (fspi * mxc_clkdivs[i] >= fin) - return i; - - return max; -} - -/* MX1, MX31, MX35 */ -static unsigned int mxc_spi_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; -} - -#define MX31_INTREG_TEEN (1 << 0) -#define MX31_INTREG_RREN (1 << 3) - -#define MX31_CSPICTRL_ENABLE (1 << 0) -#define MX31_CSPICTRL_MASTER (1 << 1) -#define MX31_CSPICTRL_XCH (1 << 2) -#define MX31_CSPICTRL_POL (1 << 4) -#define MX31_CSPICTRL_PHA (1 << 5) -#define MX31_CSPICTRL_SSCTL (1 << 6) -#define MX31_CSPICTRL_SSPOL (1 << 7) -#define MX31_CSPICTRL_BC_SHIFT 8 -#define MX35_CSPICTRL_BL_SHIFT 20 -#define MX31_CSPICTRL_CS_SHIFT 24 -#define MX35_CSPICTRL_CS_SHIFT 12 -#define MX31_CSPICTRL_DR_SHIFT 16 - -#define MX31_CSPISTATUS 0x14 -#define MX31_STATUS_RR (1 << 3) - -/* These functions also work for the i.MX35, but be aware that - * the i.MX35 has a slightly different register layout for bits - * we do not use here. - */ -static void mx31_intctrl(struct mxc_spi_data *mxc_spi, int enable) -{ - unsigned int val = 0; - - if (enable & MXC_INT_TE) - val |= MX31_INTREG_TEEN; - if (enable & MXC_INT_RR) - val |= MX31_INTREG_RREN; - - writel(val, mxc_spi->base + MXC_CSPIINT); -} - -static void mx31_trigger(struct mxc_spi_data *mxc_spi) -{ - unsigned int reg; - - reg = readl(mxc_spi->base + MXC_CSPICTRL); - reg |= MX31_CSPICTRL_XCH; - writel(reg, mxc_spi->base + MXC_CSPICTRL); -} - -static int mx31_config(struct mxc_spi_data *mxc_spi, - struct mxc_spi_config *config) -{ - unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; - - reg |= mxc_spi_clkdiv_2(mxc_spi->spi_clk, config->speed_hz) << - MX31_CSPICTRL_DR_SHIFT; - - if (cpu_is_mx31()) - reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT; - else if (cpu_is_mx35()) { - reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT; - reg |= MX31_CSPICTRL_SSCTL; - } - - if (config->mode & SPI_CPHA) - reg |= MX31_CSPICTRL_PHA; - if (config->mode & SPI_CPOL) - reg |= MX31_CSPICTRL_POL; - if (config->mode & SPI_CS_HIGH) - reg |= MX31_CSPICTRL_SSPOL; - if (config->cs < 0) { - if (cpu_is_mx31()) - reg |= (config->cs + 32) << MX31_CSPICTRL_CS_SHIFT; - else if (cpu_is_mx35()) - reg |= (config->cs + 32) << MX35_CSPICTRL_CS_SHIFT; - } - - writel(reg, mxc_spi->base + MXC_CSPICTRL); - - return 0; -} - -static int mx31_rx_available(struct mxc_spi_data *mxc_spi) -{ - return readl(mxc_spi->base + MX31_CSPISTATUS) & MX31_STATUS_RR; -} - -#define MX27_INTREG_RR (1 << 4) -#define MX27_INTREG_TEEN (1 << 9) -#define MX27_INTREG_RREN (1 << 13) - -#define MX27_CSPICTRL_POL (1 << 5) -#define MX27_CSPICTRL_PHA (1 << 6) -#define MX27_CSPICTRL_SSPOL (1 << 8) -#define MX27_CSPICTRL_XCH (1 << 9) -#define MX27_CSPICTRL_ENABLE (1 << 10) -#define MX27_CSPICTRL_MASTER (1 << 11) -#define MX27_CSPICTRL_DR_SHIFT 14 -#define MX27_CSPICTRL_CS_SHIFT 19 - -static void mx27_intctrl(struct mxc_spi_data *mxc_spi, int enable) -{ - unsigned int val = 0; - - if (enable & MXC_INT_TE) - val |= MX27_INTREG_TEEN; - if (enable & MXC_INT_RR) - val |= MX27_INTREG_RREN; - - writel(val, mxc_spi->base + MXC_CSPIINT); -} - -static void mx27_trigger(struct mxc_spi_data *mxc_spi) -{ - unsigned int reg; - - reg = readl(mxc_spi->base + MXC_CSPICTRL); - reg |= MX27_CSPICTRL_XCH; - writel(reg, mxc_spi->base + MXC_CSPICTRL); -} - -static int mx27_config(struct mxc_spi_data *mxc_spi, - struct mxc_spi_config *config) -{ - unsigned int reg = MX27_CSPICTRL_ENABLE | MX27_CSPICTRL_MASTER; - - reg |= mxc_spi_clkdiv_1(mxc_spi->spi_clk, config->speed_hz) << - MX27_CSPICTRL_DR_SHIFT; - reg |= config->bpw - 1; - - if (config->mode & SPI_CPHA) - reg |= MX27_CSPICTRL_PHA; - if (config->mode & SPI_CPOL) - reg |= MX27_CSPICTRL_POL; - if (config->mode & SPI_CS_HIGH) - reg |= MX27_CSPICTRL_SSPOL; - if (config->cs < 0) - reg |= (config->cs + 32) << MX27_CSPICTRL_CS_SHIFT; - - writel(reg, mxc_spi->base + MXC_CSPICTRL); - - return 0; -} - -static int mx27_rx_available(struct mxc_spi_data *mxc_spi) -{ - return readl(mxc_spi->base + MXC_CSPIINT) & MX27_INTREG_RR; -} - -#define MX1_INTREG_RR (1 << 3) -#define MX1_INTREG_TEEN (1 << 8) -#define MX1_INTREG_RREN (1 << 11) - -#define MX1_CSPICTRL_POL (1 << 4) -#define MX1_CSPICTRL_PHA (1 << 5) -#define MX1_CSPICTRL_XCH (1 << 8) -#define MX1_CSPICTRL_ENABLE (1 << 9) -#define MX1_CSPICTRL_MASTER (1 << 10) -#define MX1_CSPICTRL_DR_SHIFT 13 - -static void mx1_intctrl(struct mxc_spi_data *mxc_spi, int enable) -{ - unsigned int val = 0; - - if (enable & MXC_INT_TE) - val |= MX1_INTREG_TEEN; - if (enable & MXC_INT_RR) - val |= MX1_INTREG_RREN; - - writel(val, mxc_spi->base + MXC_CSPIINT); -} - -static void mx1_trigger(struct mxc_spi_data *mxc_spi) -{ - unsigned int reg; - - reg = readl(mxc_spi->base + MXC_CSPICTRL); - reg |= MX1_CSPICTRL_XCH; - writel(reg, mxc_spi->base + MXC_CSPICTRL); -} - -static int mx1_config(struct mxc_spi_data *mxc_spi, - struct mxc_spi_config *config) -{ - unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; - - reg |= mxc_spi_clkdiv_2(mxc_spi->spi_clk, config->speed_hz) << - MX1_CSPICTRL_DR_SHIFT; - reg |= config->bpw - 1; - - if (config->mode & SPI_CPHA) - reg |= MX1_CSPICTRL_PHA; - if (config->mode & SPI_CPOL) - reg |= MX1_CSPICTRL_POL; - - writel(reg, mxc_spi->base + MXC_CSPICTRL); - - return 0; -} - -static int mx1_rx_available(struct mxc_spi_data *mxc_spi) -{ - return readl(mxc_spi->base + MXC_CSPIINT) & MX1_INTREG_RR; -} - -static void mxc_spi_chipselect(struct spi_device *spi, int is_active) -{ - struct mxc_spi_data *mxc_spi = spi_master_get_devdata(spi->master); - unsigned int cs = 0; - int gpio = mxc_spi->chipselect[spi->chip_select]; - struct mxc_spi_config config; - - if (spi->mode & SPI_CS_HIGH) - cs = 1; - - if (is_active == BITBANG_CS_INACTIVE) { - if (gpio >= 0) - gpio_set_value(gpio, !cs); - return; - } - - config.bpw = spi->bits_per_word; - config.speed_hz = spi->max_speed_hz; - config.mode = spi->mode; - config.cs = mxc_spi->chipselect[spi->chip_select]; - - mxc_spi->config(mxc_spi, &config); - - /* Initialize the functions for transfer */ - if (config.bpw <= 8) { - mxc_spi->rx = mxc_spi_buf_rx_u8; - mxc_spi->tx = mxc_spi_buf_tx_u8; - } else if (config.bpw <= 16) { - mxc_spi->rx = mxc_spi_buf_rx_u16; - mxc_spi->tx = mxc_spi_buf_tx_u16; - } else if (config.bpw <= 32) { - mxc_spi->rx = mxc_spi_buf_rx_u32; - mxc_spi->tx = mxc_spi_buf_tx_u32; - } else - BUG(); - - if (gpio >= 0) - gpio_set_value(gpio, cs); - - return; -} - -static void mxc_spi_push(struct mxc_spi_data *mxc_spi) -{ - while (mxc_spi->txfifo < 8) { - if (!mxc_spi->count) - break; - mxc_spi->tx(mxc_spi); - mxc_spi->txfifo++; - } - - mxc_spi->trigger(mxc_spi); -} - -static irqreturn_t mxc_spi_isr(int irq, void *dev_id) -{ - struct mxc_spi_data *mxc_spi = dev_id; - - while (mxc_spi->rx_available(mxc_spi)) { - mxc_spi->rx(mxc_spi); - mxc_spi->txfifo--; - } - - if (mxc_spi->count) { - mxc_spi_push(mxc_spi); - return IRQ_HANDLED; - } - - if (mxc_spi->txfifo) { - /* No data left to push, but still waiting for rx data, - * enable receive data available interrupt. - */ - mxc_spi->intctrl(mxc_spi, MXC_INT_RR); - return IRQ_HANDLED; - } - - mxc_spi->intctrl(mxc_spi, 0); - complete(&mxc_spi->xfer_done); - - return IRQ_HANDLED; -} - -static int mxc_spi_setupxfer(struct spi_device *spi, - struct spi_transfer *t) -{ - struct mxc_spi_data *mxc_spi = spi_master_get_devdata(spi->master); - struct mxc_spi_config config; - - config.bpw = t ? t->bits_per_word : spi->bits_per_word; - config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; - config.mode = spi->mode; - - mxc_spi->config(mxc_spi, &config); - - return 0; -} - -static int mxc_spi_transfer(struct spi_device *spi, - struct spi_transfer *transfer) -{ - struct mxc_spi_data *mxc_spi = spi_master_get_devdata(spi->master); - - mxc_spi->tx_buf = transfer->tx_buf; - mxc_spi->rx_buf = transfer->rx_buf; - mxc_spi->count = transfer->len; - mxc_spi->txfifo = 0; - - init_completion(&mxc_spi->xfer_done); - - mxc_spi_push(mxc_spi); - - mxc_spi->intctrl(mxc_spi, MXC_INT_TE); - - wait_for_completion(&mxc_spi->xfer_done); - - return transfer->len; -} - -static int mxc_spi_setup(struct spi_device *spi) -{ - if (!spi->bits_per_word) - spi->bits_per_word = 8; - - pr_debug("%s: mode %d, %u bpw, %d hz\n", __func__, - spi->mode, spi->bits_per_word, spi->max_speed_hz); - - mxc_spi_chipselect(spi, BITBANG_CS_INACTIVE); - - return 0; -} - -static void mxc_spi_cleanup(struct spi_device *spi) -{ -} - -static int __init mxc_spi_probe(struct platform_device *pdev) -{ - struct spi_imx_master *mxc_platform_info; - struct spi_master *master; - struct mxc_spi_data *mxc_spi; - struct resource *res; - int i, ret; - - mxc_platform_info = (struct spi_imx_master *)pdev->dev.platform_data; - if (!mxc_platform_info) { - dev_err(&pdev->dev, "can't get the platform data\n"); - return -EINVAL; - } - - master = spi_alloc_master(&pdev->dev, sizeof(struct mxc_spi_data)); - if (!master) - return -ENOMEM; - - platform_set_drvdata(pdev, master); - - master->bus_num = pdev->id; - master->num_chipselect = mxc_platform_info->num_chipselect; - - mxc_spi = spi_master_get_devdata(master); - mxc_spi->bitbang.master = spi_master_get(master); - mxc_spi->chipselect = mxc_platform_info->chipselect; - - for (i = 0; i < master->num_chipselect; i++) { - if (mxc_spi->chipselect[i] < 0) - continue; - ret = gpio_request(mxc_spi->chipselect[i], DRIVER_NAME); - if (ret) { - i--; - while (i > 0) - if (mxc_spi->chipselect[i] >= 0) - gpio_free(mxc_spi->chipselect[i--]); - dev_err(&pdev->dev, "can't get cs gpios"); - goto out_master_put; - } - gpio_direction_output(mxc_spi->chipselect[i], 1); - } - - mxc_spi->bitbang.chipselect = mxc_spi_chipselect; - mxc_spi->bitbang.setup_transfer = mxc_spi_setupxfer; - mxc_spi->bitbang.txrx_bufs = mxc_spi_transfer; - mxc_spi->bitbang.master->setup = mxc_spi_setup; - mxc_spi->bitbang.master->cleanup = mxc_spi_cleanup; - - init_completion(&mxc_spi->xfer_done); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "can't get platform resource\n"); - ret = -ENOMEM; - goto out_gpio_free; - } - - if (!request_mem_region(res->start, resource_size(res), pdev->name)) { - dev_err(&pdev->dev, "request_mem_region failed\n"); - ret = -EBUSY; - goto out_gpio_free; - } - - mxc_spi->base = ioremap(res->start, resource_size(res)); - if (!mxc_spi->base) { - ret = -EINVAL; - goto out_release_mem; - } - - mxc_spi->irq = platform_get_irq(pdev, 0); - if (!mxc_spi->irq) { - ret = -EINVAL; - goto out_iounmap; - } - - ret = request_irq(mxc_spi->irq, mxc_spi_isr, 0, DRIVER_NAME, mxc_spi); - if (ret) { - dev_err(&pdev->dev, "can't get irq%d: %d\n", mxc_spi->irq, ret); - goto out_iounmap; - } - - if (cpu_is_mx31() || cpu_is_mx35()) { - mxc_spi->intctrl = mx31_intctrl; - mxc_spi->config = mx31_config; - mxc_spi->trigger = mx31_trigger; - mxc_spi->rx_available = mx31_rx_available; - } else if (cpu_is_mx27() || cpu_is_mx21()) { - mxc_spi->intctrl = mx27_intctrl; - mxc_spi->config = mx27_config; - mxc_spi->trigger = mx27_trigger; - mxc_spi->rx_available = mx27_rx_available; - } else if (cpu_is_mx1()) { - mxc_spi->intctrl = mx1_intctrl; - mxc_spi->config = mx1_config; - mxc_spi->trigger = mx1_trigger; - mxc_spi->rx_available = mx1_rx_available; - } else - BUG(); - - mxc_spi->clk = clk_get(&pdev->dev, NULL); - if (IS_ERR(mxc_spi->clk)) { - dev_err(&pdev->dev, "unable to get clock\n"); - ret = PTR_ERR(mxc_spi->clk); - goto out_free_irq; - } - - clk_enable(mxc_spi->clk); - mxc_spi->spi_clk = clk_get_rate(mxc_spi->clk); - - if (!cpu_is_mx31() || !cpu_is_mx35()) - writel(1, mxc_spi->base + MXC_RESET); - - mxc_spi->intctrl(mxc_spi, 0); - - ret = spi_bitbang_start(&mxc_spi->bitbang); - if (ret) { - dev_err(&pdev->dev, "bitbang start failed with %d\n", ret); - goto out_clk_put; - } - - dev_info(&pdev->dev, "probed\n"); - - return ret; - -out_clk_put: - clk_disable(mxc_spi->clk); - clk_put(mxc_spi->clk); -out_free_irq: - free_irq(mxc_spi->irq, mxc_spi); -out_iounmap: - iounmap(mxc_spi->base); -out_release_mem: - release_mem_region(res->start, resource_size(res)); -out_gpio_free: - for (i = 0; i < master->num_chipselect; i++) - if (mxc_spi->chipselect[i] >= 0) - gpio_free(mxc_spi->chipselect[i]); -out_master_put: - spi_master_put(master); - kfree(master); - platform_set_drvdata(pdev, NULL); - return ret; -} - -static int __exit mxc_spi_remove(struct platform_device *pdev) -{ - struct spi_master *master = platform_get_drvdata(pdev); - struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - struct mxc_spi_data *mxc_spi = spi_master_get_devdata(master); - int i; - - spi_bitbang_stop(&mxc_spi->bitbang); - - writel(0, mxc_spi->base + MXC_CSPICTRL); - clk_disable(mxc_spi->clk); - clk_put(mxc_spi->clk); - free_irq(mxc_spi->irq, mxc_spi); - iounmap(mxc_spi->base); - - for (i = 0; i < master->num_chipselect; i++) - if (mxc_spi->chipselect[i] >= 0) - gpio_free(mxc_spi->chipselect[i]); - - spi_master_put(master); - - release_mem_region(res->start, resource_size(res)); - - platform_set_drvdata(pdev, NULL); - - return 0; -} - -static struct platform_driver mxc_spi_driver = { - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, - .probe = mxc_spi_probe, - .remove = __exit_p(mxc_spi_remove), -}; - -static int __init mxc_spi_init(void) -{ - return platform_driver_register(&mxc_spi_driver); -} - -static void __exit mxc_spi_exit(void) -{ - platform_driver_unregister(&mxc_spi_driver); -} - -module_init(mxc_spi_init); -module_exit(mxc_spi_exit); - -MODULE_DESCRIPTION("SPI Master Controller driver"); -MODULE_AUTHOR("Sascha Hauer, Pengutronix"); -MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c new file mode 100644 index 000000000000..b1f530fd6bdc --- /dev/null +++ b/drivers/spi/spi_imx.c @@ -0,0 +1,685 @@ +/* + * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2008 Juergen Beisert + * + * 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; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02110-1301, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define DRIVER_NAME "spi_imx" + +#define MXC_CSPIRXDATA 0x00 +#define MXC_CSPITXDATA 0x04 +#define MXC_CSPICTRL 0x08 +#define MXC_CSPIINT 0x0c +#define MXC_RESET 0x1c + +/* generic defines to abstract from the different register layouts */ +#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */ +#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */ + +struct spi_imx_config { + unsigned int speed_hz; + unsigned int bpw; + unsigned int mode; + int cs; +}; + +struct spi_imx_data { + struct spi_bitbang bitbang; + + struct completion xfer_done; + void *base; + int irq; + struct clk *clk; + unsigned long spi_clk; + int *chipselect; + + unsigned int count; + void (*tx)(struct spi_imx_data *); + void (*rx)(struct spi_imx_data *); + void *rx_buf; + const void *tx_buf; + unsigned int txfifo; /* number of words pushed in tx FIFO */ + + /* SoC specific functions */ + void (*intctrl)(struct spi_imx_data *, int); + int (*config)(struct spi_imx_data *, struct spi_imx_config *); + void (*trigger)(struct spi_imx_data *); + int (*rx_available)(struct spi_imx_data *); +}; + +#define MXC_SPI_BUF_RX(type) \ +static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \ +{ \ + unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \ + \ + if (spi_imx->rx_buf) { \ + *(type *)spi_imx->rx_buf = val; \ + spi_imx->rx_buf += sizeof(type); \ + } \ +} + +#define MXC_SPI_BUF_TX(type) \ +static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \ +{ \ + type val = 0; \ + \ + if (spi_imx->tx_buf) { \ + val = *(type *)spi_imx->tx_buf; \ + spi_imx->tx_buf += sizeof(type); \ + } \ + \ + spi_imx->count -= sizeof(type); \ + \ + writel(val, spi_imx->base + MXC_CSPITXDATA); \ +} + +MXC_SPI_BUF_RX(u8) +MXC_SPI_BUF_TX(u8) +MXC_SPI_BUF_RX(u16) +MXC_SPI_BUF_TX(u16) +MXC_SPI_BUF_RX(u32) +MXC_SPI_BUF_TX(u32) + +/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set + * (which is currently not the case in this driver) + */ +static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, + 256, 384, 512, 768, 1024}; + +/* MX21, MX27 */ +static unsigned int spi_imx_clkdiv_1(unsigned int fin, + unsigned int fspi) +{ + int i, max; + + if (cpu_is_mx21()) + max = 18; + else + max = 16; + + for (i = 2; i < max; i++) + if (fspi * mxc_clkdivs[i] >= fin) + return i; + + return max; +} + +/* MX1, MX31, MX35 */ +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; +} + +#define MX31_INTREG_TEEN (1 << 0) +#define MX31_INTREG_RREN (1 << 3) + +#define MX31_CSPICTRL_ENABLE (1 << 0) +#define MX31_CSPICTRL_MASTER (1 << 1) +#define MX31_CSPICTRL_XCH (1 << 2) +#define MX31_CSPICTRL_POL (1 << 4) +#define MX31_CSPICTRL_PHA (1 << 5) +#define MX31_CSPICTRL_SSCTL (1 << 6) +#define MX31_CSPICTRL_SSPOL (1 << 7) +#define MX31_CSPICTRL_BC_SHIFT 8 +#define MX35_CSPICTRL_BL_SHIFT 20 +#define MX31_CSPICTRL_CS_SHIFT 24 +#define MX35_CSPICTRL_CS_SHIFT 12 +#define MX31_CSPICTRL_DR_SHIFT 16 + +#define MX31_CSPISTATUS 0x14 +#define MX31_STATUS_RR (1 << 3) + +/* These functions also work for the i.MX35, but be aware that + * the i.MX35 has a slightly different register layout for bits + * we do not use here. + */ +static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned int val = 0; + + if (enable & MXC_INT_TE) + val |= MX31_INTREG_TEEN; + if (enable & MXC_INT_RR) + val |= MX31_INTREG_RREN; + + writel(val, spi_imx->base + MXC_CSPIINT); +} + +static void mx31_trigger(struct spi_imx_data *spi_imx) +{ + unsigned int reg; + + reg = readl(spi_imx->base + MXC_CSPICTRL); + reg |= MX31_CSPICTRL_XCH; + writel(reg, spi_imx->base + MXC_CSPICTRL); +} + +static int mx31_config(struct spi_imx_data *spi_imx, + struct spi_imx_config *config) +{ + unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; + + reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << + MX31_CSPICTRL_DR_SHIFT; + + if (cpu_is_mx31()) + reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT; + else if (cpu_is_mx35()) { + reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT; + reg |= MX31_CSPICTRL_SSCTL; + } + + if (config->mode & SPI_CPHA) + reg |= MX31_CSPICTRL_PHA; + if (config->mode & SPI_CPOL) + reg |= MX31_CSPICTRL_POL; + if (config->mode & SPI_CS_HIGH) + reg |= MX31_CSPICTRL_SSPOL; + if (config->cs < 0) { + if (cpu_is_mx31()) + reg |= (config->cs + 32) << MX31_CSPICTRL_CS_SHIFT; + else if (cpu_is_mx35()) + reg |= (config->cs + 32) << MX35_CSPICTRL_CS_SHIFT; + } + + writel(reg, spi_imx->base + MXC_CSPICTRL); + + return 0; +} + +static int mx31_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR; +} + +#define MX27_INTREG_RR (1 << 4) +#define MX27_INTREG_TEEN (1 << 9) +#define MX27_INTREG_RREN (1 << 13) + +#define MX27_CSPICTRL_POL (1 << 5) +#define MX27_CSPICTRL_PHA (1 << 6) +#define MX27_CSPICTRL_SSPOL (1 << 8) +#define MX27_CSPICTRL_XCH (1 << 9) +#define MX27_CSPICTRL_ENABLE (1 << 10) +#define MX27_CSPICTRL_MASTER (1 << 11) +#define MX27_CSPICTRL_DR_SHIFT 14 +#define MX27_CSPICTRL_CS_SHIFT 19 + +static void mx27_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned int val = 0; + + if (enable & MXC_INT_TE) + val |= MX27_INTREG_TEEN; + if (enable & MXC_INT_RR) + val |= MX27_INTREG_RREN; + + writel(val, spi_imx->base + MXC_CSPIINT); +} + +static void mx27_trigger(struct spi_imx_data *spi_imx) +{ + unsigned int reg; + + reg = readl(spi_imx->base + MXC_CSPICTRL); + reg |= MX27_CSPICTRL_XCH; + writel(reg, spi_imx->base + MXC_CSPICTRL); +} + +static int mx27_config(struct spi_imx_data *spi_imx, + struct spi_imx_config *config) +{ + unsigned int reg = MX27_CSPICTRL_ENABLE | MX27_CSPICTRL_MASTER; + + reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz) << + MX27_CSPICTRL_DR_SHIFT; + reg |= config->bpw - 1; + + if (config->mode & SPI_CPHA) + reg |= MX27_CSPICTRL_PHA; + if (config->mode & SPI_CPOL) + reg |= MX27_CSPICTRL_POL; + if (config->mode & SPI_CS_HIGH) + reg |= MX27_CSPICTRL_SSPOL; + if (config->cs < 0) + reg |= (config->cs + 32) << MX27_CSPICTRL_CS_SHIFT; + + writel(reg, spi_imx->base + MXC_CSPICTRL); + + return 0; +} + +static int mx27_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MXC_CSPIINT) & MX27_INTREG_RR; +} + +#define MX1_INTREG_RR (1 << 3) +#define MX1_INTREG_TEEN (1 << 8) +#define MX1_INTREG_RREN (1 << 11) + +#define MX1_CSPICTRL_POL (1 << 4) +#define MX1_CSPICTRL_PHA (1 << 5) +#define MX1_CSPICTRL_XCH (1 << 8) +#define MX1_CSPICTRL_ENABLE (1 << 9) +#define MX1_CSPICTRL_MASTER (1 << 10) +#define MX1_CSPICTRL_DR_SHIFT 13 + +static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned int val = 0; + + if (enable & MXC_INT_TE) + val |= MX1_INTREG_TEEN; + if (enable & MXC_INT_RR) + val |= MX1_INTREG_RREN; + + writel(val, spi_imx->base + MXC_CSPIINT); +} + +static void mx1_trigger(struct spi_imx_data *spi_imx) +{ + unsigned int reg; + + reg = readl(spi_imx->base + MXC_CSPICTRL); + reg |= MX1_CSPICTRL_XCH; + writel(reg, spi_imx->base + MXC_CSPICTRL); +} + +static int mx1_config(struct spi_imx_data *spi_imx, + struct spi_imx_config *config) +{ + unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; + + reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << + MX1_CSPICTRL_DR_SHIFT; + reg |= config->bpw - 1; + + if (config->mode & SPI_CPHA) + reg |= MX1_CSPICTRL_PHA; + if (config->mode & SPI_CPOL) + reg |= MX1_CSPICTRL_POL; + + writel(reg, spi_imx->base + MXC_CSPICTRL); + + return 0; +} + +static int mx1_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR; +} + +static void spi_imx_chipselect(struct spi_device *spi, int is_active) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + unsigned int cs = 0; + int gpio = spi_imx->chipselect[spi->chip_select]; + struct spi_imx_config config; + + if (spi->mode & SPI_CS_HIGH) + cs = 1; + + if (is_active == BITBANG_CS_INACTIVE) { + if (gpio >= 0) + gpio_set_value(gpio, !cs); + return; + } + + config.bpw = spi->bits_per_word; + config.speed_hz = spi->max_speed_hz; + config.mode = spi->mode; + config.cs = spi_imx->chipselect[spi->chip_select]; + + spi_imx->config(spi_imx, &config); + + /* Initialize the functions for transfer */ + if (config.bpw <= 8) { + spi_imx->rx = spi_imx_buf_rx_u8; + spi_imx->tx = spi_imx_buf_tx_u8; + } else if (config.bpw <= 16) { + spi_imx->rx = spi_imx_buf_rx_u16; + spi_imx->tx = spi_imx_buf_tx_u16; + } else if (config.bpw <= 32) { + spi_imx->rx = spi_imx_buf_rx_u32; + spi_imx->tx = spi_imx_buf_tx_u32; + } else + BUG(); + + if (gpio >= 0) + gpio_set_value(gpio, cs); + + return; +} + +static void spi_imx_push(struct spi_imx_data *spi_imx) +{ + while (spi_imx->txfifo < 8) { + if (!spi_imx->count) + break; + spi_imx->tx(spi_imx); + spi_imx->txfifo++; + } + + spi_imx->trigger(spi_imx); +} + +static irqreturn_t spi_imx_isr(int irq, void *dev_id) +{ + struct spi_imx_data *spi_imx = dev_id; + + while (spi_imx->rx_available(spi_imx)) { + spi_imx->rx(spi_imx); + spi_imx->txfifo--; + } + + if (spi_imx->count) { + spi_imx_push(spi_imx); + return IRQ_HANDLED; + } + + if (spi_imx->txfifo) { + /* No data left to push, but still waiting for rx data, + * enable receive data available interrupt. + */ + spi_imx->intctrl(spi_imx, MXC_INT_RR); + return IRQ_HANDLED; + } + + spi_imx->intctrl(spi_imx, 0); + complete(&spi_imx->xfer_done); + + return IRQ_HANDLED; +} + +static int spi_imx_setupxfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + struct spi_imx_config config; + + config.bpw = t ? t->bits_per_word : spi->bits_per_word; + config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; + config.mode = spi->mode; + + spi_imx->config(spi_imx, &config); + + return 0; +} + +static int spi_imx_transfer(struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + + spi_imx->tx_buf = transfer->tx_buf; + spi_imx->rx_buf = transfer->rx_buf; + spi_imx->count = transfer->len; + spi_imx->txfifo = 0; + + init_completion(&spi_imx->xfer_done); + + spi_imx_push(spi_imx); + + spi_imx->intctrl(spi_imx, MXC_INT_TE); + + wait_for_completion(&spi_imx->xfer_done); + + return transfer->len; +} + +static int spi_imx_setup(struct spi_device *spi) +{ + if (!spi->bits_per_word) + spi->bits_per_word = 8; + + pr_debug("%s: mode %d, %u bpw, %d hz\n", __func__, + spi->mode, spi->bits_per_word, spi->max_speed_hz); + + spi_imx_chipselect(spi, BITBANG_CS_INACTIVE); + + return 0; +} + +static void spi_imx_cleanup(struct spi_device *spi) +{ +} + +static int __init spi_imx_probe(struct platform_device *pdev) +{ + struct spi_imx_master *mxc_platform_info; + struct spi_master *master; + struct spi_imx_data *spi_imx; + struct resource *res; + int i, ret; + + mxc_platform_info = (struct spi_imx_master *)pdev->dev.platform_data; + if (!mxc_platform_info) { + dev_err(&pdev->dev, "can't get the platform data\n"); + return -EINVAL; + } + + master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + master->bus_num = pdev->id; + master->num_chipselect = mxc_platform_info->num_chipselect; + + spi_imx = spi_master_get_devdata(master); + spi_imx->bitbang.master = spi_master_get(master); + spi_imx->chipselect = mxc_platform_info->chipselect; + + for (i = 0; i < master->num_chipselect; i++) { + if (spi_imx->chipselect[i] < 0) + continue; + ret = gpio_request(spi_imx->chipselect[i], DRIVER_NAME); + if (ret) { + i--; + while (i > 0) + if (spi_imx->chipselect[i] >= 0) + gpio_free(spi_imx->chipselect[i--]); + dev_err(&pdev->dev, "can't get cs gpios"); + goto out_master_put; + } + gpio_direction_output(spi_imx->chipselect[i], 1); + } + + spi_imx->bitbang.chipselect = spi_imx_chipselect; + spi_imx->bitbang.setup_transfer = spi_imx_setupxfer; + spi_imx->bitbang.txrx_bufs = spi_imx_transfer; + spi_imx->bitbang.master->setup = spi_imx_setup; + spi_imx->bitbang.master->cleanup = spi_imx_cleanup; + + init_completion(&spi_imx->xfer_done); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "can't get platform resource\n"); + ret = -ENOMEM; + goto out_gpio_free; + } + + if (!request_mem_region(res->start, resource_size(res), pdev->name)) { + dev_err(&pdev->dev, "request_mem_region failed\n"); + ret = -EBUSY; + goto out_gpio_free; + } + + spi_imx->base = ioremap(res->start, resource_size(res)); + if (!spi_imx->base) { + ret = -EINVAL; + goto out_release_mem; + } + + spi_imx->irq = platform_get_irq(pdev, 0); + if (!spi_imx->irq) { + ret = -EINVAL; + goto out_iounmap; + } + + ret = request_irq(spi_imx->irq, spi_imx_isr, 0, DRIVER_NAME, spi_imx); + if (ret) { + dev_err(&pdev->dev, "can't get irq%d: %d\n", spi_imx->irq, ret); + goto out_iounmap; + } + + if (cpu_is_mx31() || cpu_is_mx35()) { + spi_imx->intctrl = mx31_intctrl; + spi_imx->config = mx31_config; + spi_imx->trigger = mx31_trigger; + spi_imx->rx_available = mx31_rx_available; + } else if (cpu_is_mx27() || cpu_is_mx21()) { + spi_imx->intctrl = mx27_intctrl; + spi_imx->config = mx27_config; + spi_imx->trigger = mx27_trigger; + spi_imx->rx_available = mx27_rx_available; + } else if (cpu_is_mx1()) { + spi_imx->intctrl = mx1_intctrl; + spi_imx->config = mx1_config; + spi_imx->trigger = mx1_trigger; + spi_imx->rx_available = mx1_rx_available; + } else + BUG(); + + spi_imx->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(spi_imx->clk)) { + dev_err(&pdev->dev, "unable to get clock\n"); + ret = PTR_ERR(spi_imx->clk); + goto out_free_irq; + } + + clk_enable(spi_imx->clk); + spi_imx->spi_clk = clk_get_rate(spi_imx->clk); + + if (!cpu_is_mx31() || !cpu_is_mx35()) + writel(1, spi_imx->base + MXC_RESET); + + spi_imx->intctrl(spi_imx, 0); + + ret = spi_bitbang_start(&spi_imx->bitbang); + if (ret) { + dev_err(&pdev->dev, "bitbang start failed with %d\n", ret); + goto out_clk_put; + } + + dev_info(&pdev->dev, "probed\n"); + + return ret; + +out_clk_put: + clk_disable(spi_imx->clk); + clk_put(spi_imx->clk); +out_free_irq: + free_irq(spi_imx->irq, spi_imx); +out_iounmap: + iounmap(spi_imx->base); +out_release_mem: + release_mem_region(res->start, resource_size(res)); +out_gpio_free: + for (i = 0; i < master->num_chipselect; i++) + if (spi_imx->chipselect[i] >= 0) + gpio_free(spi_imx->chipselect[i]); +out_master_put: + spi_master_put(master); + kfree(master); + platform_set_drvdata(pdev, NULL); + return ret; +} + +static int __exit spi_imx_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + int i; + + spi_bitbang_stop(&spi_imx->bitbang); + + writel(0, spi_imx->base + MXC_CSPICTRL); + clk_disable(spi_imx->clk); + clk_put(spi_imx->clk); + free_irq(spi_imx->irq, spi_imx); + iounmap(spi_imx->base); + + for (i = 0; i < master->num_chipselect; i++) + if (spi_imx->chipselect[i] >= 0) + gpio_free(spi_imx->chipselect[i]); + + spi_master_put(master); + + release_mem_region(res->start, resource_size(res)); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver spi_imx_driver = { + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, + .probe = spi_imx_probe, + .remove = __exit_p(spi_imx_remove), +}; + +static int __init spi_imx_init(void) +{ + return platform_driver_register(&spi_imx_driver); +} + +static void __exit spi_imx_exit(void) +{ + platform_driver_unregister(&spi_imx_driver); +} + +module_init(spi_imx_init); +module_exit(spi_imx_exit); + +MODULE_DESCRIPTION("SPI Master Controller driver"); +MODULE_AUTHOR("Sascha Hauer, Pengutronix"); +MODULE_LICENSE("GPL");