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author | Florian Fainelli <florian@openwrt.org> | 2010-01-31 21:00:50 +0000 |
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committer | Florian Fainelli <florian@openwrt.org> | 2010-01-31 21:00:50 +0000 |
commit | b8d99458ffe83a3c782e26e0cd07d26d41bfeefc (patch) | |
tree | 7aed13aaf7a1311c8c63979af5d23c6c13049bfd /target/linux/brcm63xx/files/drivers/spi/bcm63xx_spi.c | |
parent | a8f779a9f7a9f12bd2f4b863a131e8d2a605109c (diff) | |
download | upstream-b8d99458ffe83a3c782e26e0cd07d26d41bfeefc.tar.gz upstream-b8d99458ffe83a3c782e26e0cd07d26d41bfeefc.tar.bz2 upstream-b8d99458ffe83a3c782e26e0cd07d26d41bfeefc.zip |
move files to files-2.6.30, to ease newer kernel integration
SVN-Revision: 19471
Diffstat (limited to 'target/linux/brcm63xx/files/drivers/spi/bcm63xx_spi.c')
-rw-r--r-- | target/linux/brcm63xx/files/drivers/spi/bcm63xx_spi.c | 445 |
1 files changed, 0 insertions, 445 deletions
diff --git a/target/linux/brcm63xx/files/drivers/spi/bcm63xx_spi.c b/target/linux/brcm63xx/files/drivers/spi/bcm63xx_spi.c deleted file mode 100644 index a20de302d2..0000000000 --- a/target/linux/brcm63xx/files/drivers/spi/bcm63xx_spi.c +++ /dev/null @@ -1,445 +0,0 @@ -/* - * Broadcom BCM63xx SPI controller support - * - * Copyright (C) 2009 Florian Fainelli <florian@openwrt.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; 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, Inc., 51 Franklin Street, Fifth Floor, - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/clk.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> -#include <linux/gpio.h> -#include <linux/completion.h> -#include <linux/err.h> - -#include <bcm63xx_io.h> -#include <bcm63xx_regs.h> -#include <bcm63xx_dev_spi.h> - -#define PFX KBUILD_MODNAME -#define DRV_VER "0.1.2" - -struct bcm63xx_spi { - /* bitbang has to be first */ - struct spi_bitbang bitbang; - struct completion done; - - void __iomem *regs; - int irq; - - /* Platform data */ - u32 speed_hz; - unsigned fifo_size; - - /* Data buffers */ - const unsigned char *tx_ptr; - unsigned char *rx_ptr; - int remaining_bytes; - - struct clk *clk; - struct resource *ioarea; - struct platform_device *pdev; -}; - -static void bcm63xx_spi_chipselect(struct spi_device *spi, int is_on) -{ - struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); - u16 val; - - val = bcm_spi_readw(bs->regs, SPI_CMD); - if (is_on == BITBANG_CS_INACTIVE) - val |= SPI_CMD_NOOP; - else if (is_on == BITBANG_CS_ACTIVE) - val |= (1 << spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); - - bcm_spi_writew(val, bs->regs, SPI_CMD); -} - -static int bcm63xx_spi_setup_transfer(struct spi_device *spi, - struct spi_transfer *t) -{ - u8 bits_per_word; - u8 clk_cfg; - u32 hz; - unsigned int div; - - struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); - - bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; - hz = (t) ? t->speed_hz : spi->max_speed_hz; - if (bits_per_word != 8) { - dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", - __func__, bits_per_word); - return -EINVAL; - } - - if (spi->chip_select > spi->master->num_chipselect) { - dev_err(&spi->dev, "%s, unsupported slave %d\n", - __func__, spi->chip_select); - return -EINVAL; - } - - /* Check clock setting */ - div = (bs->speed_hz / hz); - switch (div) { - case 2: - clk_cfg = SPI_CLK_25MHZ; - break; - case 4: - clk_cfg = SPI_CLK_12_50MHZ; - break; - case 8: - clk_cfg = SPI_CLK_6_250MHZ; - break; - case 16: - clk_cfg = SPI_CLK_3_125MHZ; - break; - case 32: - clk_cfg = SPI_CLK_1_563MHZ; - break; - case 128: - clk_cfg = SPI_CLK_0_781MHZ; - break; - case 64: - default: - /* Set to slowest mode for compatibility */ - clk_cfg = SPI_CLK_0_781MHZ; - break; - } - - bcm_spi_writeb(clk_cfg, bs->regs, SPI_CLK_CFG); - dev_dbg(&spi->dev, "Setting clock register to %d (hz %d, cmd %02x)\n", - div, hz, clk_cfg); - - return 0; -} - -/* the spi->mode bits understood by this driver: */ -#define MODEBITS (SPI_CPOL | SPI_CPHA) - -static int bcm63xx_spi_setup(struct spi_device *spi) -{ - struct spi_bitbang *bitbang; - struct bcm63xx_spi *bs; - int retval; - - bs = spi_master_get_devdata(spi->master); - bitbang = &bs->bitbang; - - if (!spi->bits_per_word) - spi->bits_per_word = 8; - - if (spi->mode & ~MODEBITS) { - dev_err(&spi->dev, "%s, unsupported mode bits %x\n", - __func__, spi->mode & ~MODEBITS); - return -EINVAL; - } - - retval = bcm63xx_spi_setup_transfer(spi, NULL); - if (retval < 0) { - dev_err(&spi->dev, "setup: unsupported mode bits %x\n", - spi->mode & ~MODEBITS); - return retval; - } - - dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n", - __func__, spi->mode & MODEBITS, spi->bits_per_word, 0); - - return 0; -} - -/* Fill the TX FIFO with as many bytes as possible */ -static void bcm63xx_spi_fill_tx_fifo(struct bcm63xx_spi *bs) -{ - u8 tail; - - /* Fill the Tx FIFO with as many bytes as possible */ - tail = bcm_spi_readb(bs->regs, SPI_MSG_TAIL); - while ((tail < bs->fifo_size) && (bs->remaining_bytes > 0)) { - if (bs->tx_ptr) - bcm_spi_writeb(*bs->tx_ptr++, bs->regs, SPI_MSG_DATA); - else - bcm_spi_writeb(0, bs->regs, SPI_MSG_DATA); - bs->remaining_bytes--; - tail = bcm_spi_readb(bs->regs, SPI_MSG_TAIL); - } -} - -static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) -{ - struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); - u8 msg_ctl; - u16 cmd; - - dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", - t->tx_buf, t->rx_buf, t->len); - - /* Transmitter is inhibited */ - bs->tx_ptr = t->tx_buf; - bs->rx_ptr = t->rx_buf; - bs->remaining_bytes = t->len; - init_completion(&bs->done); - - bcm63xx_spi_fill_tx_fifo(bs); - - /* Enable the command done interrupt which - * we use to determine completion of a command */ - bcm_spi_writeb(SPI_INTR_CMD_DONE, bs->regs, SPI_INT_MASK); - - /* Fill in the Message control register */ - msg_ctl = bcm_spi_readb(bs->regs, SPI_MSG_CTL); - msg_ctl |= (t->len << SPI_BYTE_CNT_SHIFT); - msg_ctl |= (SPI_FD_RW << SPI_MSG_TYPE_SHIFT); - bcm_spi_writeb(msg_ctl, bs->regs, SPI_MSG_CTL); - - /* Issue the transfer */ - cmd = bcm_spi_readb(bs->regs, SPI_CMD); - cmd |= SPI_CMD_START_IMMEDIATE; - cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); - bcm_spi_writeb(cmd, bs->regs, SPI_CMD); - - wait_for_completion(&bs->done); - - /* Disable the CMD_DONE interrupt */ - bcm_spi_writeb(~(SPI_INTR_CMD_DONE), bs->regs, SPI_INT_MASK); - - return t->len - bs->remaining_bytes; -} - -/* This driver supports single master mode only. Hence - * CMD_DONE is the only interrupt we care about - */ -static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) -{ - struct spi_master *master = (struct spi_master *)dev_id; - struct bcm63xx_spi *bs = spi_master_get_devdata(master); - u8 intr; - u16 cmd; - - /* Read interupts and clear them immediately */ - intr = bcm_spi_readb(bs->regs, SPI_INT_STATUS); - bcm_spi_writeb(SPI_INTR_CLEAR_ALL, bs->regs, SPI_INT_MASK); - - /* A tansfer completed */ - if (intr & SPI_INTR_CMD_DONE) { - u8 rx_empty; - - rx_empty = bcm_spi_readb(bs->regs, SPI_ST); - /* Read out all the data */ - while ((rx_empty & SPI_RX_EMPTY) == 0) { - u8 data; - - data = bcm_spi_readb(bs->regs, SPI_RX_DATA); - if (bs->rx_ptr) - *bs->rx_ptr++ = data; - - rx_empty = bcm_spi_readb(bs->regs, SPI_RX_EMPTY); - } - - /* See if there is more data to send */ - if (bs->remaining_bytes > 0) { - bcm63xx_spi_fill_tx_fifo(bs); - - /* Start the transfer */ - cmd = bcm_spi_readb(bs->regs, SPI_CMD); - cmd |= SPI_CMD_START_IMMEDIATE; - cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); - bcm_spi_writeb(cmd, bs->regs, SPI_CMD); - } else - complete(&bs->done); - } - - return IRQ_HANDLED; -} - - -static int __init bcm63xx_spi_probe(struct platform_device *pdev) -{ - struct resource *r; - struct bcm63xx_spi_pdata *pdata = pdev->dev.platform_data; - int irq; - struct spi_master *master; - struct clk *clk; - struct bcm63xx_spi *bs; - int ret; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!r) { - ret = -ENXIO; - goto out; - } - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - ret = -ENXIO; - goto out; - } - - clk = clk_get(&pdev->dev, "spi"); - if (IS_ERR(clk)) { - dev_err(&pdev->dev, "No clock for device\n"); - ret = -ENODEV; - goto out; - } - - master = spi_alloc_master(&pdev->dev, sizeof(struct bcm63xx_spi)); - if (!master) { - ret = -ENOMEM; - goto out_free; - } - - bs = spi_master_get_devdata(master); - bs->bitbang.master = spi_master_get(master); - bs->bitbang.chipselect = bcm63xx_spi_chipselect; - bs->bitbang.setup_transfer = bcm63xx_spi_setup_transfer; - bs->bitbang.txrx_bufs = bcm63xx_txrx_bufs; - bs->bitbang.master->setup = bcm63xx_spi_setup; - init_completion(&bs->done); - - platform_set_drvdata(pdev, master); - bs->pdev = pdev; - - if (!request_mem_region(r->start, - r->end - r->start, PFX)) { - ret = -ENXIO; - goto out_free; - } - - bs->regs = ioremap_nocache(r->start, r->end - r->start); - if (!bs->regs) { - printk(KERN_ERR PFX " unable to ioremap regs\n"); - ret = -ENOMEM; - goto out_free; - } - bs->irq = irq; - bs->clk = clk; - bs->fifo_size = pdata->fifo_size; - - ret = request_irq(irq, bcm63xx_spi_interrupt, 0, - pdev->name, master); - if (ret) { - printk(KERN_ERR PFX " unable to request irq\n"); - goto out_unmap; - } - - master->bus_num = pdata->bus_num; - master->num_chipselect = pdata->num_chipselect; - bs->speed_hz = pdata->speed_hz; - - /* Initialize hardware */ - clk_enable(bs->clk); - bcm_spi_writeb(SPI_INTR_CLEAR_ALL, bs->regs, SPI_INT_MASK); - - dev_info(&pdev->dev, " at 0x%08x (irq %d, FIFOs size %d) v%s\n", - r->start, irq, bs->fifo_size, DRV_VER); - - ret = spi_bitbang_start(&bs->bitbang); - if (ret) { - dev_err(&pdev->dev, "spi_bitbang_start FAILED\n"); - goto out_reset_hw; - } - - return ret; - -out_reset_hw: - clk_disable(clk); - free_irq(irq, master); -out_unmap: - iounmap(bs->regs); -out_free: - clk_put(clk); - spi_master_put(master); -out: - return ret; -} - -static int __exit bcm63xx_spi_remove(struct platform_device *pdev) -{ - struct spi_master *master = platform_get_drvdata(pdev); - struct bcm63xx_spi *bs = spi_master_get_devdata(master); - - spi_bitbang_stop(&bs->bitbang); - clk_disable(bs->clk); - clk_put(bs->clk); - free_irq(bs->irq, master); - iounmap(bs->regs); - platform_set_drvdata(pdev, 0); - spi_master_put(bs->bitbang.master); - - return 0; -} - -#ifdef CONFIG_PM -static int bcm63xx_spi_suspend(struct platform_device *pdev, pm_message_t mesg) -{ - struct spi_master *master = platform_get_drvdata(pdev); - struct bcm63xx_spi *bs = spi_master_get_devdata(master); - - clk_disable(bs->clk); - - return 0; -} - -static int bcm63xx_spi_resume(struct platform_device *pdev) -{ - struct bcm63xx_spi *bs = spi_master_get_devdata(master); - struct bcm63xx_spi *bs = spi_master_get_devdata(master); - - clk_enable(bs->clk); - - return 0; -} -#else -#define bcm63xx_spi_suspend NULL -#define bcm63xx_spi_resume NULL -#endif - -static struct platform_driver bcm63xx_spi_driver = { - .driver = { - .name = "bcm63xx-spi", - .owner = THIS_MODULE, - }, - .probe = bcm63xx_spi_probe, - .remove = bcm63xx_spi_remove, - .suspend = bcm63xx_spi_suspend, - .resume = bcm63xx_spi_resume, -}; - - -static int __init bcm63xx_spi_init(void) -{ - return platform_driver_register(&bcm63xx_spi_driver); -} - -static void __exit bcm63xx_spi_exit(void) -{ - platform_driver_unregister(&bcm63xx_spi_driver); -} - -module_init(bcm63xx_spi_init); -module_exit(bcm63xx_spi_exit); - -MODULE_ALIAS("platform:bcm63xx_spi"); -MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); -MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(DRV_VER); |