aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm63xx/patches-3.3/426-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm63xx/patches-3.3/426-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch')
-rw-r--r--target/linux/brcm63xx/patches-3.3/426-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch481
1 files changed, 481 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.3/426-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch b/target/linux/brcm63xx/patches-3.3/426-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch
new file mode 100644
index 0000000000..739c2c60f7
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.3/426-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch
@@ -0,0 +1,481 @@
+From 4b27423676485d05bcd6fc6f3809164fb8f9d22d Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jonas.gorski@gmail.com>
+Date: Sat, 12 Nov 2011 12:19:55 +0100
+Subject: [PATCH 30/60] SPI: MIPS: BCM63XX: Add HSSPI driver
+
+Add a driver for the High Speed SPI controller found on newer BCM63XX SoCs.
+
+Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+---
+ .../include/asm/mach-bcm63xx/bcm63xx_dev_hsspi.h | 2 +
+ drivers/spi/Kconfig | 7 +
+ drivers/spi/Makefile | 1 +
+ drivers/spi/spi-bcm63xx-hsspi.c | 427 ++++++++++++++++++++
+ 4 files changed, 437 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/spi/spi-bcm63xx-hsspi.c
+
+--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_hsspi.h
++++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_hsspi.h
+@@ -17,4 +17,6 @@ struct bcm63xx_hsspi_pdata {
+
+ #define HSSPI_PLL_HZ_6328 133333333
+
++#define HSSPI_BUFFER_LEN 512
++
+ #endif /* BCM63XX_DEV_HSSPI_H */
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -100,6 +100,13 @@ config SPI_BCM63XX
+ help
+ Enable support for the SPI controller on the Broadcom BCM63xx SoCs.
+
++config SPI_BCM63XX_HSSPI
++ tristate "Broadcom BCM63XX HS SPI controller driver"
++ depends on BCM63XX
++ help
++ This enables support for the High Speed SPI controller present on
++ newer Broadcom BCM63XX SoCs.
++
+ config SPI_BITBANG
+ tristate "Utilities for Bitbanging SPI masters"
+ help
+--- a/drivers/spi/Makefile
++++ b/drivers/spi/Makefile
+@@ -15,6 +15,7 @@ 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-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o
+ obj-$(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-hsspi.c
+@@ -0,0 +1,427 @@
++/*
++ * Broadcom BCM63XX High Speed SPI Controller driver
++ *
++ * Copyright 2000-2010 Broadcom Corporation
++ * Copyright 2012 Jonas Gorski <jonas.gorski@gmail.com>
++ *
++ * Licensed under the GNU/GPL. See COPYING for details.
++ */
++
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/clk.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/delay.h>
++#include <linux/dma-mapping.h>
++#include <linux/err.h>
++#include <linux/interrupt.h>
++#include <linux/spi/spi.h>
++#include <linux/workqueue.h>
++
++#include <bcm63xx_regs.h>
++#include <bcm63xx_dev_hsspi.h>
++
++#define HSSPI_OP_CODE_SHIFT 13
++#define HSSPI_OP_SLEEP (0 << HSSPI_OP_CODE_SHIFT)
++#define HSSPI_OP_READ_WRITE (1 << HSSPI_OP_CODE_SHIFT)
++#define HSSPI_OP_WRITE (2 << HSSPI_OP_CODE_SHIFT)
++#define HSSPI_OP_READ (3 << HSSPI_OP_CODE_SHIFT)
++
++#define HSSPI_MAX_PREPEND_LEN 15
++
++#define HSSPI_MAX_SYNC_CLOCK 30000000
++
++struct bcm63xx_hsspi {
++ struct completion done;
++ struct spi_transfer *curr_trans;
++
++ struct platform_device *pdev;
++ struct clk *clk;
++ void __iomem *regs;
++ u8 __iomem *fifo;
++
++ u32 speed_hz;
++ int irq;
++};
++
++static void bcm63xx_hsspi_set_clk(struct bcm63xx_hsspi *bs, int hz,
++ int profile)
++{
++ u32 reg;
++
++ reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz));
++ bcm_hsspi_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | reg,
++ HSSPI_PROFILE_CLK_CTRL_REG(profile));
++
++ reg = bcm_hsspi_readl(HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
++ if (hz > HSSPI_MAX_SYNC_CLOCK)
++ reg |= SIGNAL_CTRL_ASYNC_INPUT_PATH;
++ else
++ reg &= ~SIGNAL_CTRL_ASYNC_INPUT_PATH;
++ bcm_hsspi_writel(reg, HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
++}
++
++static int bcm63xx_hsspi_do_txrx(struct spi_device *spi,
++ struct spi_transfer *t1,
++ struct spi_transfer *t2)
++{
++ struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master);
++ u8 chip_select = spi->chip_select;
++ u16 opcode = 0;
++ int len, prepend_size = 0;
++
++ init_completion(&bs->done);
++
++ bs->curr_trans = t2 ? t2 : t1;
++ bcm63xx_hsspi_set_clk(bs, bs->curr_trans->speed_hz, chip_select);
++
++ if (t2 && !t2->tx_buf)
++ prepend_size = t1->len;
++
++ bcm_hsspi_writel(prepend_size << MODE_CTRL_PREPENDBYTE_CNT_SHIFT |
++ 2 << MODE_CTRL_MULTIDATA_WR_STRT_SHIFT |
++ 2 << MODE_CTRL_MULTIDATA_RD_STRT_SHIFT | 0xff,
++ HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
++
++ if (t1->rx_buf && t1->tx_buf)
++ opcode = HSSPI_OP_READ_WRITE;
++ else if (t1->rx_buf || (t2 && t2->rx_buf))
++ opcode = HSSPI_OP_READ;
++ else if (t1->tx_buf)
++ opcode = HSSPI_OP_WRITE;
++
++ if (opcode == HSSPI_OP_READ && t2)
++ len = t2->len;
++ else
++ len = t1->len;
++
++ if (t1->tx_buf) {
++ memcpy_toio(bs->fifo + 2, t1->tx_buf, t1->len);
++ if (t2 && t2->tx_buf) {
++ memcpy_toio(bs->fifo + 2 + t1->len,
++ t2->tx_buf, t2->len);
++ len += t2->len;
++ }
++ }
++
++ opcode |= len;
++ memcpy_toio(bs->fifo, &opcode, sizeof(opcode));
++
++ /* enable interrupt */
++ bcm_hsspi_writel(HSSPI_PING0_CMD_DONE, HSSPI_INT_MASK_REG);
++
++ /* start the transfer */
++ bcm_hsspi_writel(chip_select << PINGPONG_CMD_SS_SHIFT |
++ chip_select << PINGPONG_CMD_PROFILE_SHIFT |
++ PINGPONG_COMMAND_START_NOW,
++ HSSPI_PINGPONG_COMMAND_REG(0));
++
++ if (wait_for_completion_timeout(&bs->done, HZ) == 0) {
++ dev_err(&bs->pdev->dev, "transfer timed out!\n");
++ return -ETIMEDOUT;
++ }
++
++ return t1->len + (t2 ? t2->len : 0);
++}
++
++static int bcm63xx_hsspi_setup(struct spi_device *spi)
++{
++ u32 reg;
++
++ if (spi->bits_per_word != 8)
++ return -EINVAL;
++
++ if (spi->max_speed_hz == 0)
++ return -EINVAL;
++
++ reg = bcm_hsspi_readl(HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select));
++ reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING);
++ if (spi->mode & SPI_CPHA)
++ reg |= SIGNAL_CTRL_LAUNCH_RISING;
++ else
++ reg |= SIGNAL_CTRL_LATCH_RISING;
++ bcm_hsspi_writel(reg, HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select));
++
++ return 0;
++}
++
++static int bcm63xx_hsspi_transfer_one(struct spi_master *master,
++ struct spi_message *msg)
++{
++ struct spi_transfer *t, *prev = NULL;
++ struct spi_device *spi = msg->spi;
++ u32 reg;
++ int ret = -EINVAL;
++ int len = 0;
++
++ /* check if we are able to make these transfers */
++ list_for_each_entry(t, &msg->transfers, transfer_list) {
++ if (!t->tx_buf && !t->rx_buf)
++ goto out;
++
++ if (t->speed_hz == 0)
++ t->speed_hz = spi->max_speed_hz;
++
++ if (t->speed_hz > spi->max_speed_hz)
++ goto out;
++
++ if (t->len > HSSPI_BUFFER_LEN)
++ goto out;
++
++ /*
++ * This controller does not support keeping the chip select
++ * active between transfers.
++ * This logic currently supports combining:
++ * write then read with no cs_change (e.g. m25p80 RDSR)
++ * write then write with no cs_change (e.g. m25p80 PP)
++ */
++ if (prev && prev->tx_buf && !prev->cs_change && !t->cs_change) {
++ /*
++ * reject if we have to combine two tx transfers and
++ * their combined length is bigger than the buffer
++ */
++ if (prev->tx_buf && t->tx_buf &&
++ (prev->len + t->len) > HSSPI_BUFFER_LEN)
++ goto out;
++ /*
++ * reject if we need write more than 15 bytes in read
++ * then write.
++ */
++ if (prev->tx_buf && t->rx_buf &&
++ prev->len > HSSPI_MAX_PREPEND_LEN)
++ goto out;
++ }
++
++ }
++
++ /* setup clock polarity */
++ reg = bcm_hsspi_readl(HSSPI_GLOBAL_CTRL_REG);
++ reg &= ~GLOBAL_CTRL_CLK_POLARITY;
++ if (spi->mode & SPI_CPOL)
++ reg |= GLOBAL_CTRL_CLK_POLARITY;
++ bcm_hsspi_writel(reg, HSSPI_GLOBAL_CTRL_REG);
++
++ list_for_each_entry(t, &msg->transfers, transfer_list) {
++ if (prev && prev->tx_buf && !prev->cs_change && !t->cs_change) {
++ /* combine write with following transfer */
++ ret = bcm63xx_hsspi_do_txrx(msg->spi, prev, t);
++ if (ret < 0)
++ goto out;
++
++ len += ret;
++ prev = NULL;
++ continue;
++ }
++
++ /* write the previous pending transfer */
++ if (prev != NULL) {
++ ret = bcm63xx_hsspi_do_txrx(msg->spi, prev, NULL);
++ if (ret < 0)
++ goto out;
++
++ len += ret;
++ }
++
++ prev = t;
++ }
++
++ /* do last pending transfer */
++ if (prev != NULL) {
++ ret = bcm63xx_hsspi_do_txrx(msg->spi, prev, NULL);
++ if (ret < 0)
++ goto out;
++ len += ret;
++ }
++
++ msg->actual_length = len;
++ ret = 0;
++out:
++ msg->status = ret;
++ spi_finalize_current_message(master);
++ return 0;
++}
++
++static irqreturn_t bcm63xx_hsspi_interrupt(int irq, void *dev_id)
++{
++ struct spi_master *master = (struct spi_master *)dev_id;
++ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
++
++ if (bcm_hsspi_readl(HSSPI_INT_STATUS_MASKED_REG) == 0)
++ return IRQ_NONE;
++
++ bcm_hsspi_writel(HSSPI_INT_CLEAR_ALL, HSSPI_INT_STATUS_REG);
++ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
++
++ if (bs->curr_trans && bs->curr_trans->rx_buf)
++ memcpy_fromio(bs->curr_trans->rx_buf, bs->fifo,
++ bs->curr_trans->len);
++ complete(&bs->done);
++
++ return IRQ_HANDLED;
++}
++
++static int __devinit bcm63xx_hsspi_probe(struct platform_device *pdev)
++{
++
++ struct spi_master *master;
++ struct bcm63xx_hsspi *bs;
++ struct resource *res_mem;
++ void __iomem *regs;
++ struct device *dev = &pdev->dev;
++ struct bcm63xx_hsspi_pdata *pdata = pdev->dev.platform_data;
++ struct clk *clk;
++ int irq;
++ int ret;
++
++ irq = platform_get_irq(pdev, 0);
++ if (irq < 0) {
++ dev_err(dev, "no irq\n");
++ return -ENXIO;
++ }
++
++ res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ regs = devm_request_and_ioremap(dev, res_mem);
++ if (!regs) {
++ dev_err(dev, "unable to ioremap regs\n");
++ return -ENXIO;
++ }
++
++ clk = clk_get(dev, "hsspi");
++
++ if (IS_ERR(clk)) {
++ ret = PTR_ERR(clk);
++ goto out_release;
++ }
++
++ clk_prepare_enable(clk);
++
++ master = spi_alloc_master(&pdev->dev, sizeof(*bs));
++ if (!master) {
++ ret = -ENOMEM;
++ goto out_disable_clk;
++ }
++
++ bs = spi_master_get_devdata(master);
++ bs->pdev = pdev;
++ bs->clk = clk;
++ bs->regs = regs;
++
++ master->bus_num = pdata->bus_num;
++ master->num_chipselect = 8;
++ master->setup = bcm63xx_hsspi_setup;
++ master->transfer_one_message = bcm63xx_hsspi_transfer_one;
++ master->mode_bits = SPI_CPOL | SPI_CPHA;
++
++ bs->speed_hz = pdata->speed_hz;
++ bs->fifo = (u8 __iomem *)(bs->regs + HSSPI_FIFO_REG(0));
++
++ platform_set_drvdata(pdev, master);
++
++ bs->curr_trans = NULL;
++
++ /* Initialize the hardware */
++ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
++
++ /* clean up any pending interrupts */
++ bcm_hsspi_writel(HSSPI_INT_CLEAR_ALL, HSSPI_INT_STATUS_REG);
++
++ bcm_hsspi_writel(bcm_hsspi_readl(HSSPI_GLOBAL_CTRL_REG) |
++ GLOBAL_CTRL_CLK_GATE_SSOFF,
++ HSSPI_GLOBAL_CTRL_REG);
++
++ ret = devm_request_irq(dev, irq, bcm63xx_hsspi_interrupt, IRQF_SHARED,
++ pdev->name, master);
++
++ if (ret)
++ goto out_put_master;
++
++ /* register and we are done */
++ ret = spi_register_master(master);
++ if (ret)
++ goto out_free_irq;
++
++ return 0;
++
++out_free_irq:
++ devm_free_irq(dev, bs->irq, master);
++out_put_master:
++ spi_master_put(master);
++out_disable_clk:
++ clk_disable_unprepare(clk);
++ clk_put(clk);
++out_release:
++ devm_ioremap_release(dev, regs);
++
++ return ret;
++}
++
++
++static int __exit bcm63xx_hsspi_remove(struct platform_device *pdev)
++{
++ struct spi_master *master = platform_get_drvdata(pdev);
++ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
++
++ spi_unregister_master(master);
++
++ /* reset the hardware and block queue progress */
++ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
++ clk_disable_unprepare(bs->clk);
++ clk_put(bs->clk);
++
++ return 0;
++}
++
++#ifdef CONFIG_PM
++static int bcm63xx_hsspi_suspend(struct platform_device *pdev,
++ pm_message_t mesg)
++{
++ struct spi_master *master = platform_get_drvdata(pdev);
++ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
++
++ spi_master_suspend(master);
++ clk_disable(bs->clk);
++
++ return 0;
++}
++
++static int bcm63xx_hsspi_resume(struct platform_device *pdev)
++{
++ struct spi_master *master = platform_get_drvdata(pdev);
++ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
++
++ clk_enable(bs->clk);
++ spi_master_resume(master);
++
++ return 0;
++}
++
++static const struct dev_pm_ops bcm63xx_hsspi_pm_ops = {
++ .suspend = bcm63xx_hsspi_suspend,
++ .resume = bcm63xx_hsspi_resume,
++};
++
++#define BCM63XX_HSSPI_PM_OPS (&bcm63xx_hsspi_pm_ops)
++#else
++#define BCM63XX_HSSPI_PM_OPS NULL
++#endif
++
++
++
++static struct platform_driver bcm63xx_hsspi_driver = {
++ .driver = {
++ .name = "bcm63xx-hsspi",
++ .owner = THIS_MODULE,
++ .pm = BCM63XX_HSSPI_PM_OPS,
++ },
++ .probe = bcm63xx_hsspi_probe,
++ .remove = __exit_p(bcm63xx_hsspi_remove),
++};
++
++module_platform_driver(bcm63xx_hsspi_driver);
++
++MODULE_ALIAS("platform:bcm63xx_hsspi");
++MODULE_DESCRIPTION("Broadcom BCM63xx HS SPI Controller driver");
++MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com>");
++MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 08:54:08 +0000