diff options
Diffstat (limited to 'drivers/spi/spi_imx.c')
| -rw-r--r-- | drivers/spi/spi_imx.c | 689 |
1 files changed, 0 insertions, 689 deletions
diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c deleted file mode 100644 index 1893f1e96dc..00000000000 --- a/drivers/spi/spi_imx.c +++ /dev/null @@ -1,689 +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 <linux/clk.h> -#include <linux/completion.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/gpio.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/irq.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> -#include <linux/types.h> - -#include <mach/spi.h> - -#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 - -#define MX3_CSPISTAT 0x14 -#define MX3_CSPISTAT_RR (1 << 3) - -/* 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_mx25() || 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_mx25() || 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); - int gpio = spi_imx->chipselect[spi->chip_select]; - int active = is_active != BITBANG_CS_INACTIVE; - int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); - - if (gpio < 0) - return; - - gpio_set_value(gpio, dev_is_lowactive ^ active); -} - -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; - config.cs = spi_imx->chipselect[spi->chip_select]; - - if (!config.speed_hz) - config.speed_hz = spi->max_speed_hz; - if (!config.bpw) - config.bpw = spi->bits_per_word; - if (!config.speed_hz) - config.speed_hz = spi->max_speed_hz; - - /* 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(); - - 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) -{ - struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); - int gpio = spi_imx->chipselect[spi->chip_select]; - - pr_debug("%s: mode %d, %u bpw, %d hz\n", __func__, - spi->mode, spi->bits_per_word, spi->max_speed_hz); - - if (gpio >= 0) - gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); - - spi_imx_chipselect(spi, BITBANG_CS_INACTIVE); - - return 0; -} - -static void spi_imx_cleanup(struct spi_device *spi) -{ -} - -static int __devinit 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 = dev_get_platdata(&pdev->dev); - 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) { - while (i > 0) { - i--; - if (spi_imx->chipselect[i] >= 0) - gpio_free(spi_imx->chipselect[i]); - } - dev_err(&pdev->dev, "can't get cs gpios\n"); - goto out_master_put; - } - } - - 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; - spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - - 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 <= 0) { - 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_mx25() || 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_mx1() || cpu_is_mx21() || cpu_is_mx27()) - writel(1, spi_imx->base + MXC_RESET); - - /* drain receive buffer */ - if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35()) - while (readl(spi_imx->base + MX3_CSPISTAT) & MX3_CSPISTAT_RR) - readl(spi_imx->base + MXC_CSPIRXDATA); - - 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 __devexit 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 = __devexit_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"); |