sunxi: initial 3.14 patchset

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

SVN-Revision: 42313

1 files changed, 571 insertions, 0 deletions

diff --git a/target/linux/sunxi/patches-3.14/146-2-spi-add-a10-spi.patch b/target/linux/sunxi/patches-3.14/146-2-spi-add-a10-spi.patch
new file mode 100644
index 0000000000..38461d4dc0
--- /dev/null
+++ b/target/linux/sunxi/patches-3.14/146-2-spi-add-a10-spi.patch
@@ -0,0 +1,571 @@
+From 1ae7667375308c27023d793372d6be1f3b89f5b5 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime.ripard@free-electrons.com>
+Date: Sat, 22 Feb 2014 22:35:53 +0100
+Subject: [PATCH] spi: sunxi: Add Allwinner A10 SPI controller driver
+
+The older Allwinner SoCs (A10, A13, A10s and A20) all have the same SPI
+controller.
+
+Unfortunately, this SPI controller, even though quite similar, is significantly
+different from the recently supported A31 SPI controller (different registers
+offset, split/merged registers, etc.). Supporting both controllers in a single
+driver would be unreasonable, hence the addition of a new driver.
+
+Like its more recent counterpart, it supports DMA, but the driver only does PIO
+until we have a dmaengine driver for this platform.
+
+Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
+---
+ .../devicetree/bindings/spi/spi-sun4i.txt          |  24 ++
+ drivers/spi/Kconfig                                |   6 +
+ drivers/spi/Makefile                               |   1 +
+ drivers/spi/spi-sun4i.c                            | 477 +++++++++++++++++++++
+ 4 files changed, 508 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/spi/spi-sun4i.txt
+ create mode 100644 drivers/spi/spi-sun4i.c
+
+diff --git a/Documentation/devicetree/bindings/spi/spi-sun4i.txt b/Documentation/devicetree/bindings/spi/spi-sun4i.txt
+new file mode 100644
+index 0000000..de827f5
+--- /dev/null
++++ b/Documentation/devicetree/bindings/spi/spi-sun4i.txt
+@@ -0,0 +1,24 @@
++Allwinner A10 SPI controller
++
++Required properties:
++- compatible: Should be "allwinner,sun4-a10-spi".
++- reg: Should contain register location and length.
++- interrupts: Should contain interrupt.
++- clocks: phandle to the clocks feeding the SPI controller. Two are
++          needed:
++  - "ahb": the gated AHB parent clock
++  - "mod": the parent module clock
++- clock-names: Must contain the clock names described just above
++
++Example:
++
++spi1: spi@01c06000 {
++	compatible = "allwinner,sun4i-a10-spi";
++	reg = <0x01c06000 0x1000>;
++	interrupts = <11>;
++	clocks = <&ahb_gates 21>, <&spi1_clk>;
++	clock-names = "ahb", "mod";
++	status = "disabled";
++	#address-cells = <1>;
++	#size-cells = <0>;
++};
+diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
+index 58530d3..78adfae 100644
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -446,6 +446,12 @@ config SPI_SIRF
+ 	help
+ 	  SPI driver for CSR SiRFprimaII SoCs
+ 
++config SPI_SUN4I
++	tristate "Allwinner A10 SoCs SPI controller"
++	depends on ARCH_SUNXI || COMPILE_TEST
++	help
++	  SPI driver for Allwinner sun4i, sun5i and sun7i SoCs
++
+ config SPI_SUN6I
+ 	tristate "Allwinner A31 SPI controller"
+ 	depends on ARCH_SUNXI || COMPILE_TEST
+diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
+index 13b6ccf9..65f4993 100644
+--- a/drivers/spi/Makefile
++++ b/drivers/spi/Makefile
+@@ -70,6 +70,7 @@ obj-$(CONFIG_SPI_SH_HSPI)		+= spi-sh-hspi.o
+ obj-$(CONFIG_SPI_SH_MSIOF)		+= spi-sh-msiof.o
+ obj-$(CONFIG_SPI_SH_SCI)		+= spi-sh-sci.o
+ obj-$(CONFIG_SPI_SIRF)		+= spi-sirf.o
++obj-$(CONFIG_SPI_SUN4I)			+= spi-sun4i.o
+ obj-$(CONFIG_SPI_SUN6I)			+= spi-sun6i.o
+ obj-$(CONFIG_SPI_TEGRA114)		+= spi-tegra114.o
+ obj-$(CONFIG_SPI_TEGRA20_SFLASH)	+= spi-tegra20-sflash.o
+diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
+new file mode 100644
+index 0000000..3f82705
+--- /dev/null
++++ b/drivers/spi/spi-sun4i.c
+@@ -0,0 +1,477 @@
++/*
++ * Copyright (C) 2012 - 2014 Allwinner Tech
++ * Pan Nan <pannan@allwinnertech.com>
++ *
++ * Copyright (C) 2014 Maxime Ripard
++ * Maxime Ripard <maxime.ripard@free-electrons.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.
++ */
++
++#include <linux/clk.h>
++#include <linux/delay.h>
++#include <linux/device.h>
++#include <linux/interrupt.h>
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/pm_runtime.h>
++#include <linux/workqueue.h>
++
++#include <linux/spi/spi.h>
++
++#define SUN4I_FIFO_DEPTH		64
++
++#define SUN4I_RXDATA_REG		0x00
++
++#define SUN4I_TXDATA_REG		0x04
++
++#define SUN4I_CTL_REG			0x08
++#define SUN4I_CTL_ENABLE			BIT(0)
++#define SUN4I_CTL_MASTER			BIT(1)
++#define SUN4I_CTL_CPHA				BIT(2)
++#define SUN4I_CTL_CPOL				BIT(3)
++#define SUN4I_CTL_CS_ACTIVE_LOW			BIT(4)
++#define SUN4I_CTL_LMTF				BIT(6)
++#define SUN4I_CTL_TF_RST			BIT(8)
++#define SUN4I_CTL_RF_RST			BIT(9)
++#define SUN4I_CTL_XCH				BIT(10)
++#define SUN4I_CTL_CS_MASK			0x3000
++#define SUN4I_CTL_CS(cs)			(((cs) << 12) & SUN4I_CTL_CS_MASK)
++#define SUN4I_CTL_DHB				BIT(15)
++#define SUN4I_CTL_CS_MANUAL			BIT(16)
++#define SUN4I_CTL_CS_LEVEL			BIT(17)
++#define SUN4I_CTL_TP				BIT(18)
++
++#define SUN4I_INT_CTL_REG		0x0c
++#define SUN4I_INT_CTL_TC			BIT(16)
++
++#define SUN4I_INT_STA_REG		0x10
++
++#define SUN4I_DMA_CTL_REG		0x14
++
++#define SUN4I_WAIT_REG			0x18
++
++#define SUN4I_CLK_CTL_REG		0x1c
++#define SUN4I_CLK_CTL_CDR2_MASK			0xff
++#define SUN4I_CLK_CTL_CDR2(div)			((div) & SUN4I_CLK_CTL_CDR2_MASK)
++#define SUN4I_CLK_CTL_CDR1_MASK			0xf
++#define SUN4I_CLK_CTL_CDR1(div)			(((div) & SUN4I_CLK_CTL_CDR1_MASK) << 8)
++#define SUN4I_CLK_CTL_DRS			BIT(12)
++
++#define SUN4I_BURST_CNT_REG		0x20
++#define SUN4I_BURST_CNT(cnt)			((cnt) & 0xffffff)
++
++#define SUN4I_XMIT_CNT_REG		0x24
++#define SUN4I_XMIT_CNT(cnt)			((cnt) & 0xffffff)
++
++#define SUN4I_FIFO_STA_REG		0x28
++#define SUN4I_FIFO_STA_RF_CNT_MASK		0x7f
++#define SUN4I_FIFO_STA_RF_CNT_BITS		0
++#define SUN4I_FIFO_STA_TF_CNT_MASK		0x7f
++#define SUN4I_FIFO_STA_TF_CNT_BITS		16
++
++struct sun4i_spi {
++	struct spi_master	*master;
++	void __iomem		*base_addr;
++	struct clk		*hclk;
++	struct clk		*mclk;
++
++	struct completion	done;
++
++	const u8		*tx_buf;
++	u8			*rx_buf;
++	int			len;
++};
++
++static inline u32 sun4i_spi_read(struct sun4i_spi *sspi, u32 reg)
++{
++	return readl(sspi->base_addr + reg);
++}
++
++static inline void sun4i_spi_write(struct sun4i_spi *sspi, u32 reg, u32 value)
++{
++	writel(value, sspi->base_addr + reg);
++}
++
++static inline void sun4i_spi_drain_fifo(struct sun4i_spi *sspi, int len)
++{
++	u32 reg, cnt;
++	u8 byte;
++
++	/* See how much data is available */
++	reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG);
++	reg &= SUN4I_FIFO_STA_RF_CNT_MASK;
++	cnt = reg >> SUN4I_FIFO_STA_RF_CNT_BITS;
++
++	if (len > cnt)
++		len = cnt;
++
++	while (len--) {
++		byte = readb(sspi->base_addr + SUN4I_RXDATA_REG);
++		if (sspi->rx_buf)
++			*sspi->rx_buf++ = byte;
++	}
++}
++
++static inline void sun4i_spi_fill_fifo(struct sun4i_spi *sspi, int len)
++{
++	u8 byte;
++
++	if (len > sspi->len)
++		len = sspi->len;
++
++	while (len--) {
++		byte = sspi->tx_buf ? *sspi->tx_buf++ : 0;
++		writeb(byte, sspi->base_addr + SUN4I_TXDATA_REG);
++		sspi->len--;
++	}
++}
++
++static void sun4i_spi_set_cs(struct spi_device *spi, bool enable)
++{
++	struct sun4i_spi *sspi = spi_master_get_devdata(spi->master);
++	u32 reg;
++
++	reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
++
++	reg &= ~SUN4I_CTL_CS_MASK;
++	reg |= SUN4I_CTL_CS(spi->chip_select);
++
++	if (enable)
++		reg |= SUN4I_CTL_CS_LEVEL;
++	else
++		reg &= ~SUN4I_CTL_CS_LEVEL;
++
++	/*
++	 * Even though this looks irrelevant since we are supposed to
++	 * be controlling the chip select manually, this bit also
++	 * controls the levels of the chip select for inactive
++	 * devices.
++	 *
++	 * If we don't set it, the chip select level will go low by
++	 * default when the device is idle, which is not really
++	 * expected in the common case where the chip select is active
++	 * low.
++	 */
++	if (spi->mode & SPI_CS_HIGH)
++		reg &= ~SUN4I_CTL_CS_ACTIVE_LOW;
++	else
++		reg |= SUN4I_CTL_CS_ACTIVE_LOW;
++
++	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
++}
++
++static int sun4i_spi_transfer_one(struct spi_master *master,
++				  struct spi_device *spi,
++				  struct spi_transfer *tfr)
++{
++	struct sun4i_spi *sspi = spi_master_get_devdata(master);
++	unsigned int mclk_rate, div, timeout;
++	unsigned int tx_len = 0;
++	int ret = 0;
++	u32 reg;
++
++	/* We don't support transfer larger than the FIFO */
++	if (tfr->len > SUN4I_FIFO_DEPTH)
++		return -EINVAL;
++
++	reinit_completion(&sspi->done);
++	sspi->tx_buf = tfr->tx_buf;
++	sspi->rx_buf = tfr->rx_buf;
++	sspi->len = tfr->len;
++
++	/* Clear pending interrupts */
++	sun4i_spi_write(sspi, SUN4I_INT_STA_REG, ~0);
++
++
++	reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
++
++	/* Reset FIFOs */
++	sun4i_spi_write(sspi, SUN4I_CTL_REG,
++			reg | SUN4I_CTL_RF_RST | SUN4I_CTL_TF_RST);
++
++	/*
++	 * Setup the transfer control register: Chip Select,
++	 * polarities, etc.
++	 */
++	if (spi->mode & SPI_CPOL)
++		reg |= SUN4I_CTL_CPOL;
++	else
++		reg &= ~SUN4I_CTL_CPOL;
++
++	if (spi->mode & SPI_CPHA)
++		reg |= SUN4I_CTL_CPHA;
++	else
++		reg &= ~SUN4I_CTL_CPHA;
++
++	if (spi->mode & SPI_LSB_FIRST)
++		reg |= SUN4I_CTL_LMTF;
++	else
++		reg &= ~SUN4I_CTL_LMTF;
++
++
++	/*
++	 * If it's a TX only transfer, we don't want to fill the RX
++	 * FIFO with bogus data
++	 */
++	if (sspi->rx_buf)
++		reg &= ~SUN4I_CTL_DHB;
++	else
++		reg |= SUN4I_CTL_DHB;
++
++	/* We want to control the chip select manually */
++	reg |= SUN4I_CTL_CS_MANUAL;
++
++	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
++
++	/* Ensure that we have a parent clock fast enough */
++	mclk_rate = clk_get_rate(sspi->mclk);
++	if (mclk_rate < (2 * spi->max_speed_hz)) {
++		clk_set_rate(sspi->mclk, 2 * spi->max_speed_hz);
++		mclk_rate = clk_get_rate(sspi->mclk);
++	}
++
++	/*
++	 * Setup clock divider.
++	 *
++	 * We have two choices there. Either we can use the clock
++	 * divide rate 1, which is calculated thanks to this formula:
++	 * SPI_CLK = MOD_CLK / (2 ^ (cdr + 1))
++	 * Or we can use CDR2, which is calculated with the formula:
++	 * SPI_CLK = MOD_CLK / (2 * (cdr + 1))
++	 * Wether we use the former or the latter is set through the
++	 * DRS bit.
++	 *
++	 * First try CDR2, and if we can't reach the expected
++	 * frequency, fall back to CDR1.
++	 */
++	div = mclk_rate / (2 * spi->max_speed_hz);
++	if (div <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) {
++		if (div > 0)
++			div--;
++
++		reg = SUN4I_CLK_CTL_CDR2(div) | SUN4I_CLK_CTL_DRS;
++	} else {
++		div = ilog2(mclk_rate) - ilog2(spi->max_speed_hz);
++		reg = SUN4I_CLK_CTL_CDR1(div);
++	}
++
++	sun4i_spi_write(sspi, SUN4I_CLK_CTL_REG, reg);
++
++	/* Setup the transfer now... */
++	if (sspi->tx_buf)
++		tx_len = tfr->len;
++
++	/* Setup the counters */
++	sun4i_spi_write(sspi, SUN4I_BURST_CNT_REG, SUN4I_BURST_CNT(tfr->len));
++	sun4i_spi_write(sspi, SUN4I_XMIT_CNT_REG, SUN4I_XMIT_CNT(tx_len));
++
++	/* Fill the TX FIFO */
++	sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH);
++
++	/* Enable the interrupts */
++	sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, SUN4I_INT_CTL_TC);
++
++	/* Start the transfer */
++	reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
++	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH);
++
++	timeout = wait_for_completion_timeout(&sspi->done,
++					      msecs_to_jiffies(1000));
++	if (!timeout) {
++		ret = -ETIMEDOUT;
++		goto out;
++	}
++
++	sun4i_spi_drain_fifo(sspi, SUN4I_FIFO_DEPTH);
++
++out:
++	sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, 0);
++
++	return ret;
++}
++
++static irqreturn_t sun4i_spi_handler(int irq, void *dev_id)
++{
++	struct sun4i_spi *sspi = dev_id;
++	u32 status = sun4i_spi_read(sspi, SUN4I_INT_STA_REG);
++
++	/* Transfer complete */
++	if (status & SUN4I_INT_CTL_TC) {
++		sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TC);
++		complete(&sspi->done);
++		return IRQ_HANDLED;
++	}
++
++	return IRQ_NONE;
++}
++
++static int sun4i_spi_runtime_resume(struct device *dev)
++{
++	struct spi_master *master = dev_get_drvdata(dev);
++	struct sun4i_spi *sspi = spi_master_get_devdata(master);
++	int ret;
++
++	ret = clk_prepare_enable(sspi->hclk);
++	if (ret) {
++		dev_err(dev, "Couldn't enable AHB clock\n");
++		goto out;
++	}
++
++	ret = clk_prepare_enable(sspi->mclk);
++	if (ret) {
++		dev_err(dev, "Couldn't enable module clock\n");
++		goto err;
++	}
++
++	sun4i_spi_write(sspi, SUN4I_CTL_REG,
++			SUN4I_CTL_ENABLE | SUN4I_CTL_MASTER | SUN4I_CTL_TP);
++
++	return 0;
++
++err:
++	clk_disable_unprepare(sspi->hclk);
++out:
++	return ret;
++}
++
++static int sun4i_spi_runtime_suspend(struct device *dev)
++{
++	struct spi_master *master = dev_get_drvdata(dev);
++	struct sun4i_spi *sspi = spi_master_get_devdata(master);
++
++	clk_disable_unprepare(sspi->mclk);
++	clk_disable_unprepare(sspi->hclk);
++
++	return 0;
++}
++
++static int sun4i_spi_probe(struct platform_device *pdev)
++{
++	struct spi_master *master;
++	struct sun4i_spi *sspi;
++	struct resource	*res;
++	int ret = 0, irq;
++
++	master = spi_alloc_master(&pdev->dev, sizeof(struct sun4i_spi));
++	if (!master) {
++		dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
++		return -ENOMEM;
++	}
++
++	platform_set_drvdata(pdev, master);
++	sspi = spi_master_get_devdata(master);
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	sspi->base_addr = devm_ioremap_resource(&pdev->dev, res);
++	if (IS_ERR(sspi->base_addr)) {
++		ret = PTR_ERR(sspi->base_addr);
++		goto err_free_master;
++	}
++
++	irq = platform_get_irq(pdev, 0);
++	if (irq < 0) {
++		dev_err(&pdev->dev, "No spi IRQ specified\n");
++		ret = -ENXIO;
++		goto err_free_master;
++	}
++
++	ret = devm_request_irq(&pdev->dev, irq, sun4i_spi_handler,
++			       0, "sun4i-spi", sspi);
++	if (ret) {
++		dev_err(&pdev->dev, "Cannot request IRQ\n");
++		goto err_free_master;
++	}
++
++	sspi->master = master;
++	master->set_cs = sun4i_spi_set_cs;
++	master->transfer_one = sun4i_spi_transfer_one;
++	master->num_chipselect = 4;
++	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
++	master->dev.of_node = pdev->dev.of_node;
++	master->auto_runtime_pm = true;
++
++	sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
++	if (IS_ERR(sspi->hclk)) {
++		dev_err(&pdev->dev, "Unable to acquire AHB clock\n");
++		ret = PTR_ERR(sspi->hclk);
++		goto err_free_master;
++	}
++
++	sspi->mclk = devm_clk_get(&pdev->dev, "mod");
++	if (IS_ERR(sspi->mclk)) {
++		dev_err(&pdev->dev, "Unable to acquire module clock\n");
++		ret = PTR_ERR(sspi->mclk);
++		goto err_free_master;
++	}
++
++	init_completion(&sspi->done);
++
++	/*
++	 * This wake-up/shutdown pattern is to be able to have the
++	 * device woken up, even if runtime_pm is disabled
++	 */
++	ret = sun4i_spi_runtime_resume(&pdev->dev);
++	if (ret) {
++		dev_err(&pdev->dev, "Couldn't resume the device\n");
++		goto err_free_master;
++	}
++
++	pm_runtime_set_active(&pdev->dev);
++	pm_runtime_enable(&pdev->dev);
++	pm_runtime_idle(&pdev->dev);
++
++	ret = devm_spi_register_master(&pdev->dev, master);
++	if (ret) {
++		dev_err(&pdev->dev, "cannot register SPI master\n");
++		goto err_pm_disable;
++	}
++
++	return 0;
++
++err_pm_disable:
++	pm_runtime_disable(&pdev->dev);
++	sun4i_spi_runtime_suspend(&pdev->dev);
++err_free_master:
++	spi_master_put(master);
++	return ret;
++}
++
++static int sun4i_spi_remove(struct platform_device *pdev)
++{
++	pm_runtime_disable(&pdev->dev);
++
++	return 0;
++}
++
++static const struct of_device_id sun4i_spi_match[] = {
++	{ .compatible = "allwinner,sun4i-a10-spi", },
++	{}
++};
++MODULE_DEVICE_TABLE(of, sun4i_spi_match);
++
++static const struct dev_pm_ops sun4i_spi_pm_ops = {
++	.runtime_resume		= sun4i_spi_runtime_resume,
++	.runtime_suspend	= sun4i_spi_runtime_suspend,
++};
++
++static struct platform_driver sun4i_spi_driver = {
++	.probe	= sun4i_spi_probe,
++	.remove	= sun4i_spi_remove,
++	.driver	= {
++		.name		= "sun4i-spi",
++		.owner		= THIS_MODULE,
++		.of_match_table	= sun4i_spi_match,
++		.pm		= &sun4i_spi_pm_ops,
++	},
++};
++module_platform_driver(sun4i_spi_driver);
++
++MODULE_AUTHOR("Pan Nan <pannan@allwinnertech.com>");
++MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
++MODULE_DESCRIPTION("Allwinner A1X/A20 SPI controller driver");
++MODULE_LICENSE("GPL");
+-- 
+2.0.3
+