From aa058f66664b53ab0314ed0591b65a1e66a988bf Mon Sep 17 00:00:00 2001 From: florian Date: Sun, 31 Jan 2010 21:00:50 +0000 Subject: [brcm63xx] move files to files-2.6.30, to ease newer kernel integration git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19471 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../files-2.6.30/drivers/spi/bcm63xx_spi.c | 445 +++++++++++++++++++++ 1 file changed, 445 insertions(+) create mode 100644 target/linux/brcm63xx/files-2.6.30/drivers/spi/bcm63xx_spi.c (limited to 'target/linux/brcm63xx/files-2.6.30/drivers/spi') diff --git a/target/linux/brcm63xx/files-2.6.30/drivers/spi/bcm63xx_spi.c b/target/linux/brcm63xx/files-2.6.30/drivers/spi/bcm63xx_spi.c new file mode 100644 index 000000000..a20de302d --- /dev/null +++ b/target/linux/brcm63xx/files-2.6.30/drivers/spi/bcm63xx_spi.c @@ -0,0 +1,445 @@ +/* + * Broadcom BCM63xx SPI controller support + * + * Copyright (C) 2009 Florian Fainelli + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#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 "); +MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VER); -- cgit v1.2.3