aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch')
-rw-r--r--target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch532
1 files changed, 532 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch b/target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch
new file mode 100644
index 000000000..e4939599a
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch
@@ -0,0 +1,532 @@
+From 5f592b818a2c5731bb12137e7cffc3aa6e24ee5a Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <florian@openwrt.org>
+Date: Wed, 1 Feb 2012 09:14:09 +0000
+Subject: [PATCH 13/63] spi: add Broadcom BCM63xx SPI controller driver
+
+This patch adds support for the SPI controller found on the Broadcom BCM63xx
+SoCs.
+
+Signed-off-by: Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
+Signed-off-by: Florian Fainelli <florian@openwrt.org>
+Acked-by: Grant Likely <grant.likely@secretlab.ca>
+---
+ drivers/spi/Kconfig | 6 +
+ drivers/spi/Makefile | 1 +
+ drivers/spi/spi-bcm63xx.c | 486 +++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 493 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/spi/spi-bcm63xx.c
+
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -94,6 +94,12 @@ config SPI_AU1550
+ If you say yes to this option, support will be included for the
+ PSC SPI controller found on Au1550, Au1200 and Au1300 series.
+
++config SPI_BCM63XX
++ tristate "Broadcom BCM63xx SPI controller"
++ depends on BCM63XX
++ help
++ Enable support for the SPI controller on the Broadcom BCM63xx SoCs.
++
+ config SPI_BITBANG
+ tristate "Utilities for Bitbanging SPI masters"
+ help
+--- a/drivers/spi/Makefile
++++ b/drivers/spi/Makefile
+@@ -14,6 +14,7 @@ obj-$(CONFIG_SPI_ALTERA) += spi-altera.
+ obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o
+ obj-$(CONFIG_SPI_ATH79) += spi-ath79.o
+ obj-$(CONFIG_SPI_AU1550) += spi-au1550.o
++obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o
+ obj-$(CONFIG_SPI_BFIN) += spi-bfin5xx.o
+ obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o
+ obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
+--- /dev/null
++++ b/drivers/spi/spi-bcm63xx.c
+@@ -0,0 +1,486 @@
++/*
++ * Broadcom BCM63xx SPI controller support
++ *
++ * Copyright (C) 2009-2011 Florian Fainelli <florian@openwrt.org>
++ * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
++ *
++ * 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/io.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/completion.h>
++#include <linux/err.h>
++
++#include <bcm63xx_dev_spi.h>
++
++#define PFX KBUILD_MODNAME
++#define DRV_VER "0.1.2"
++
++struct bcm63xx_spi {
++ spinlock_t lock;
++ int stopping;
++ 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;
++
++ /* data iomem */
++ u8 __iomem *tx_io;
++ const u8 __iomem *rx_io;
++
++ int remaining_bytes;
++
++ struct clk *clk;
++ struct platform_device *pdev;
++};
++
++static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs,
++ unsigned int offset)
++{
++ return bcm_readb(bs->regs + bcm63xx_spireg(offset));
++}
++
++static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs,
++ unsigned int offset)
++{
++ return bcm_readw(bs->regs + bcm63xx_spireg(offset));
++}
++
++static inline void bcm_spi_writeb(struct bcm63xx_spi *bs,
++ u8 value, unsigned int offset)
++{
++ bcm_writeb(value, bs->regs + bcm63xx_spireg(offset));
++}
++
++static inline void bcm_spi_writew(struct bcm63xx_spi *bs,
++ u16 value, unsigned int offset)
++{
++ bcm_writew(value, bs->regs + bcm63xx_spireg(offset));
++}
++
++static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = {
++ { 20000000, SPI_CLK_20MHZ },
++ { 12500000, SPI_CLK_12_50MHZ },
++ { 6250000, SPI_CLK_6_250MHZ },
++ { 3125000, SPI_CLK_3_125MHZ },
++ { 1563000, SPI_CLK_1_563MHZ },
++ { 781000, SPI_CLK_0_781MHZ },
++ { 391000, SPI_CLK_0_391MHZ }
++};
++
++static int bcm63xx_spi_setup_transfer(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
++ u8 bits_per_word;
++ u8 clk_cfg, reg;
++ u32 hz;
++ int i;
++
++ 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;
++ }
++
++ /* Find the closest clock configuration */
++ for (i = 0; i < SPI_CLK_MASK; i++) {
++ if (hz >= bcm63xx_spi_freq_table[i][0]) {
++ clk_cfg = bcm63xx_spi_freq_table[i][1];
++ break;
++ }
++ }
++
++ /* No matching configuration found, default to lowest */
++ if (i == SPI_CLK_MASK)
++ clk_cfg = SPI_CLK_0_391MHZ;
++
++ /* clear existing clock configuration bits of the register */
++ reg = bcm_spi_readb(bs, SPI_CLK_CFG);
++ reg &= ~SPI_CLK_MASK;
++ reg |= clk_cfg;
++
++ bcm_spi_writeb(bs, reg, SPI_CLK_CFG);
++ dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n",
++ clk_cfg, hz);
++
++ 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 bcm63xx_spi *bs;
++ int ret;
++
++ bs = spi_master_get_devdata(spi->master);
++
++ if (bs->stopping)
++ return -ESHUTDOWN;
++
++ 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;
++ }
++
++ ret = bcm63xx_spi_setup_transfer(spi, NULL);
++ if (ret < 0) {
++ dev_err(&spi->dev, "setup: unsupported mode bits %x\n",
++ spi->mode & ~MODEBITS);
++ return ret;
++ }
++
++ 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 size;
++
++ /* Fill the Tx FIFO with as many bytes as possible */
++ size = bs->remaining_bytes < bs->fifo_size ? bs->remaining_bytes :
++ bs->fifo_size;
++ memcpy_toio(bs->tx_io, bs->tx_ptr, size);
++ bs->remaining_bytes -= size;
++}
++
++static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
++{
++ struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
++ u16 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;
++ init_completion(&bs->done);
++
++ if (t->tx_buf) {
++ bs->remaining_bytes = t->len;
++ bcm63xx_spi_fill_tx_fifo(bs);
++ }
++
++ /* Enable the command done interrupt which
++ * we use to determine completion of a command */
++ bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
++
++ /* Fill in the Message control register */
++ msg_ctl = (t->len << SPI_BYTE_CNT_SHIFT);
++
++ if (t->rx_buf && t->tx_buf)
++ msg_ctl |= (SPI_FD_RW << SPI_MSG_TYPE_SHIFT);
++ else if (t->rx_buf)
++ msg_ctl |= (SPI_HD_R << SPI_MSG_TYPE_SHIFT);
++ else if (t->tx_buf)
++ msg_ctl |= (SPI_HD_W << SPI_MSG_TYPE_SHIFT);
++
++ bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL);
++
++ /* Issue the transfer */
++ cmd = SPI_CMD_START_IMMEDIATE;
++ cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
++ cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT);
++ bcm_spi_writew(bs, cmd, SPI_CMD);
++ wait_for_completion(&bs->done);
++
++ /* Disable the CMD_DONE interrupt */
++ bcm_spi_writeb(bs, 0, SPI_INT_MASK);
++
++ return t->len - bs->remaining_bytes;
++}
++
++static int bcm63xx_transfer(struct spi_device *spi, struct spi_message *m)
++{
++ struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
++ struct spi_transfer *t;
++ int ret = 0;
++
++ if (unlikely(list_empty(&m->transfers)))
++ return -EINVAL;
++
++ if (bs->stopping)
++ return -ESHUTDOWN;
++
++ list_for_each_entry(t, &m->transfers, transfer_list) {
++ ret += bcm63xx_txrx_bufs(spi, t);
++ }
++
++ m->complete(m->context);
++
++ return ret;
++}
++
++/* 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, SPI_INT_STATUS);
++ bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
++ bcm_spi_writeb(bs, 0, SPI_INT_MASK);
++
++ /* A tansfer completed */
++ if (intr & SPI_INTR_CMD_DONE) {
++ u8 rx_tail;
++
++ rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
++
++ /* Read out all the data */
++ if (rx_tail)
++ memcpy_fromio(bs->rx_ptr, bs->rx_io, rx_tail);
++
++ /* See if there is more data to send */
++ if (bs->remaining_bytes > 0) {
++ bcm63xx_spi_fill_tx_fifo(bs);
++
++ /* Start the transfer */
++ bcm_spi_writew(bs, SPI_HD_W << SPI_MSG_TYPE_SHIFT,
++ SPI_MSG_CTL);
++ cmd = bcm_spi_readw(bs, SPI_CMD);
++ cmd |= SPI_CMD_START_IMMEDIATE;
++ cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
++ bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
++ bcm_spi_writew(bs, cmd, SPI_CMD);
++ } else {
++ complete(&bs->done);
++ }
++ }
++
++ return IRQ_HANDLED;
++}
++
++
++static int __devinit bcm63xx_spi_probe(struct platform_device *pdev)
++{
++ struct resource *r;
++ struct device *dev = &pdev->dev;
++ 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) {
++ dev_err(dev, "no iomem\n");
++ ret = -ENXIO;
++ goto out;
++ }
++
++ irq = platform_get_irq(pdev, 0);
++ if (irq < 0) {
++ dev_err(dev, "no irq\n");
++ ret = -ENXIO;
++ goto out;
++ }
++
++ clk = clk_get(dev, "spi");
++ if (IS_ERR(clk)) {
++ dev_err(dev, "no clock for device\n");
++ ret = PTR_ERR(clk);
++ goto out;
++ }
++
++ master = spi_alloc_master(dev, sizeof(*bs));
++ if (!master) {
++ dev_err(dev, "out of memory\n");
++ ret = -ENOMEM;
++ goto out_clk;
++ }
++
++ bs = spi_master_get_devdata(master);
++ init_completion(&bs->done);
++
++ platform_set_drvdata(pdev, master);
++ bs->pdev = pdev;
++
++ if (!devm_request_mem_region(&pdev->dev, r->start,
++ resource_size(r), PFX)) {
++ dev_err(dev, "iomem request failed\n");
++ ret = -ENXIO;
++ goto out_err;
++ }
++
++ bs->regs = devm_ioremap_nocache(&pdev->dev, r->start,
++ resource_size(r));
++ if (!bs->regs) {
++ dev_err(dev, "unable to ioremap regs\n");
++ ret = -ENOMEM;
++ goto out_err;
++ }
++
++ bs->irq = irq;
++ bs->clk = clk;
++ bs->fifo_size = pdata->fifo_size;
++
++ ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0,
++ pdev->name, master);
++ if (ret) {
++ dev_err(dev, "unable to request irq\n");
++ goto out_err;
++ }
++
++ master->bus_num = pdata->bus_num;
++ master->num_chipselect = pdata->num_chipselect;
++ master->setup = bcm63xx_spi_setup;
++ master->transfer = bcm63xx_transfer;
++ bs->speed_hz = pdata->speed_hz;
++ bs->stopping = 0;
++ bs->tx_io = (u8 *)(bs->regs + bcm63xx_spireg(SPI_MSG_DATA));
++ bs->rx_io = (const u8 *)(bs->regs + bcm63xx_spireg(SPI_RX_DATA));
++ spin_lock_init(&bs->lock);
++
++ /* Initialize hardware */
++ clk_enable(bs->clk);
++ bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
++
++ /* register and we are done */
++ ret = spi_register_master(master);
++ if (ret) {
++ dev_err(dev, "spi register failed\n");
++ goto out_clk_disable;
++ }
++
++ dev_info(dev, "at 0x%08x (irq %d, FIFOs size %d) v%s\n",
++ r->start, irq, bs->fifo_size, DRV_VER);
++
++ return 0;
++
++out_clk_disable:
++ clk_disable(clk);
++out_err:
++ platform_set_drvdata(pdev, NULL);
++ spi_master_put(master);
++out_clk:
++ clk_put(clk);
++out:
++ return ret;
++}
++
++static int __devexit bcm63xx_spi_remove(struct platform_device *pdev)
++{
++ struct spi_master *master = platform_get_drvdata(pdev);
++ struct bcm63xx_spi *bs = spi_master_get_devdata(master);
++
++ /* reset spi block */
++ bcm_spi_writeb(bs, 0, SPI_INT_MASK);
++ spin_lock(&bs->lock);
++ bs->stopping = 1;
++
++ /* HW shutdown */
++ clk_disable(bs->clk);
++ clk_put(bs->clk);
++
++ spin_unlock(&bs->lock);
++ platform_set_drvdata(pdev, 0);
++ spi_unregister_master(master);
++
++ return 0;
++}
++
++#ifdef CONFIG_PM
++static int bcm63xx_spi_suspend(struct device *dev)
++{
++ struct spi_master *master =
++ platform_get_drvdata(to_platform_device(dev));
++ struct bcm63xx_spi *bs = spi_master_get_devdata(master);
++
++ clk_disable(bs->clk);
++
++ return 0;
++}
++
++static int bcm63xx_spi_resume(struct device *dev)
++{
++ struct spi_master *master =
++ platform_get_drvdata(to_platform_device(dev));
++ struct bcm63xx_spi *bs = spi_master_get_devdata(master);
++
++ clk_enable(bs->clk);
++
++ return 0;
++}
++
++static const struct dev_pm_ops bcm63xx_spi_pm_ops = {
++ .suspend = bcm63xx_spi_suspend,
++ .resume = bcm63xx_spi_resume,
++};
++
++#define BCM63XX_SPI_PM_OPS (&bcm63xx_spi_pm_ops)
++#else
++#define BCM63XX_SPI_PM_OPS NULL
++#endif
++
++static struct platform_driver bcm63xx_spi_driver = {
++ .driver = {
++ .name = "bcm63xx-spi",
++ .owner = THIS_MODULE,
++ .pm = BCM63XX_SPI_PM_OPS,
++ },
++ .probe = bcm63xx_spi_probe,
++ .remove = __devexit_p(bcm63xx_spi_remove),
++};
++
++module_platform_driver(bcm63xx_spi_driver);
++
++MODULE_ALIAS("platform:bcm63xx_spi");
++MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
++MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>");
++MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver");
++MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-06 06:37:18 +0000