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, 0 insertions, 532 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
deleted file mode 100644
index e4939599a8..0000000000
--- a/target/linux/brcm63xx/patches-3.3/011-spi-add-Broadcom-BCM63xx-SPI-controller-driver.patch
+++ /dev/null
@@ -1,532 +0,0 @@
-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 2.25.1) at 2024-11-06 10:10:55 +0000