brcm2708: add support for 3.10 kernel

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 37218

1 files changed, 452 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-3.10/015-bcm2708-i2c-driver.patch b/target/linux/brcm2708/patches-3.10/015-bcm2708-i2c-driver.patch
new file mode 100644
index 0000000000..531ae6989e
--- /dev/null
+++ b/target/linux/brcm2708/patches-3.10/015-bcm2708-i2c-driver.patch
@@ -0,0 +1,452 @@
+diff -urN linux-3.10/drivers/i2c/busses/i2c-bcm2708.c linux-rpi-3.10.y/drivers/i2c/busses/i2c-bcm2708.c
+--- linux-3.10/drivers/i2c/busses/i2c-bcm2708.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-rpi-3.10.y/drivers/i2c/busses/i2c-bcm2708.c	2013-07-06 15:25:50.000000000 +0100
+@@ -0,0 +1,408 @@
++/*
++ * Driver for Broadcom BCM2708 BSC Controllers
++ *
++ * Copyright (C) 2012 Chris Boot & Frank Buss
++ *
++ * This driver is inspired by:
++ * i2c-ocores.c, by Peter Korsgaard <jacmet@sunsite.dk>
++ *
++ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/spinlock.h>
++#include <linux/clk.h>
++#include <linux/err.h>
++#include <linux/platform_device.h>
++#include <linux/io.h>
++#include <linux/slab.h>
++#include <linux/i2c.h>
++#include <linux/interrupt.h>
++#include <linux/sched.h>
++#include <linux/wait.h>
++
++/* BSC register offsets */
++#define BSC_C			0x00
++#define BSC_S			0x04
++#define BSC_DLEN		0x08
++#define BSC_A			0x0c
++#define BSC_FIFO		0x10
++#define BSC_DIV			0x14
++#define BSC_DEL			0x18
++#define BSC_CLKT		0x1c
++
++/* Bitfields in BSC_C */
++#define BSC_C_I2CEN		0x00008000
++#define BSC_C_INTR		0x00000400
++#define BSC_C_INTT		0x00000200
++#define BSC_C_INTD		0x00000100
++#define BSC_C_ST		0x00000080
++#define BSC_C_CLEAR_1		0x00000020
++#define BSC_C_CLEAR_2		0x00000010
++#define BSC_C_READ		0x00000001
++
++/* Bitfields in BSC_S */
++#define BSC_S_CLKT		0x00000200
++#define BSC_S_ERR		0x00000100
++#define BSC_S_RXF		0x00000080
++#define BSC_S_TXE		0x00000040
++#define BSC_S_RXD		0x00000020
++#define BSC_S_TXD		0x00000010
++#define BSC_S_RXR		0x00000008
++#define BSC_S_TXW		0x00000004
++#define BSC_S_DONE		0x00000002
++#define BSC_S_TA		0x00000001
++
++#define I2C_TIMEOUT_MS	150
++
++#define DRV_NAME	"bcm2708_i2c"
++
++static unsigned int baudrate = CONFIG_I2C_BCM2708_BAUDRATE;
++module_param(baudrate, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
++MODULE_PARM_DESC(baudrate, "The I2C baudrate");
++
++
++struct bcm2708_i2c {
++	struct i2c_adapter adapter;
++
++	spinlock_t lock;
++	void __iomem *base;
++	int irq;
++	struct clk *clk;
++
++	struct completion done;
++
++	struct i2c_msg *msg;
++	int pos;
++	int nmsgs;
++	bool error;
++};
++
++/*
++ * This function sets the ALT mode on the I2C pins so that we can use them with
++ * the BSC hardware.
++ *
++ * FIXME: This is a hack. Use pinmux / pinctrl.
++ */
++static void bcm2708_i2c_init_pinmode(int id)
++{
++#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
++#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))
++
++	int pin;
++	u32 *gpio = ioremap(0x20200000, SZ_16K);
++
++        BUG_ON(id != 0 && id != 1);
++	/* BSC0 is on GPIO 0 & 1, BSC1 is on GPIO 2 & 3 */
++	for (pin = id*2+0; pin <= id*2+1; pin++) {
++printk("bcm2708_i2c_init_pinmode(%d,%d)\n", id, pin);
++		INP_GPIO(pin);		/* set mode to GPIO input first */
++		SET_GPIO_ALT(pin, 0);	/* set mode to ALT 0 */
++	}
++
++	iounmap(gpio);
++
++#undef INP_GPIO
++#undef SET_GPIO_ALT
++}
++
++static inline u32 bcm2708_rd(struct bcm2708_i2c *bi, unsigned reg)
++{
++	return readl(bi->base + reg);
++}
++
++static inline void bcm2708_wr(struct bcm2708_i2c *bi, unsigned reg, u32 val)
++{
++	writel(val, bi->base + reg);
++}
++
++static inline void bcm2708_bsc_reset(struct bcm2708_i2c *bi)
++{
++	bcm2708_wr(bi, BSC_C, 0);
++	bcm2708_wr(bi, BSC_S, BSC_S_CLKT | BSC_S_ERR | BSC_S_DONE);	
++}
++
++static inline void bcm2708_bsc_fifo_drain(struct bcm2708_i2c *bi)
++{
++	while ((bcm2708_rd(bi, BSC_S) & BSC_S_RXD) && (bi->pos < bi->msg->len))
++		bi->msg->buf[bi->pos++] = bcm2708_rd(bi, BSC_FIFO);
++}
++
++static inline void bcm2708_bsc_fifo_fill(struct bcm2708_i2c *bi)
++{
++	while ((bcm2708_rd(bi, BSC_S) & BSC_S_TXD) && (bi->pos < bi->msg->len))
++		bcm2708_wr(bi, BSC_FIFO, bi->msg->buf[bi->pos++]);
++}
++
++static inline void bcm2708_bsc_setup(struct bcm2708_i2c *bi)
++{
++	unsigned long bus_hz;
++	u32 cdiv;
++	u32 c = BSC_C_I2CEN | BSC_C_INTD | BSC_C_ST | BSC_C_CLEAR_1;
++
++	bus_hz = clk_get_rate(bi->clk);
++	cdiv = bus_hz / baudrate;
++
++	if (bi->msg->flags & I2C_M_RD)
++		c |= BSC_C_INTR | BSC_C_READ;
++	else
++		c |= BSC_C_INTT;
++
++	bcm2708_wr(bi, BSC_DIV, cdiv);
++	bcm2708_wr(bi, BSC_A, bi->msg->addr);
++	bcm2708_wr(bi, BSC_DLEN, bi->msg->len);
++	bcm2708_wr(bi, BSC_C, c);
++}
++
++static irqreturn_t bcm2708_i2c_interrupt(int irq, void *dev_id)
++{
++	struct bcm2708_i2c *bi = dev_id;
++	bool handled = true;
++	u32 s;
++
++	spin_lock(&bi->lock);
++
++	/* we may see camera interrupts on the "other" I2C channel
++           Just return if we've not sent anything */
++        if (!bi->nmsgs || !bi->msg )
++		goto early_exit;
++
++	s = bcm2708_rd(bi, BSC_S);
++
++	if (s & (BSC_S_CLKT | BSC_S_ERR)) {
++		bcm2708_bsc_reset(bi);
++		bi->error = true;
++
++		/* wake up our bh */
++		complete(&bi->done);
++	} else if (s & BSC_S_DONE) {
++		bi->nmsgs--;
++
++		if (bi->msg->flags & I2C_M_RD)
++			bcm2708_bsc_fifo_drain(bi);
++
++		bcm2708_bsc_reset(bi);
++
++		if (bi->nmsgs) {
++			/* advance to next message */
++			bi->msg++;
++			bi->pos = 0;
++			bcm2708_bsc_setup(bi);
++		} else {
++			/* wake up our bh */
++			complete(&bi->done);
++		}
++	} else if (s & BSC_S_TXW) {
++		bcm2708_bsc_fifo_fill(bi);
++	} else if (s & BSC_S_RXR) {
++		bcm2708_bsc_fifo_drain(bi);
++	} else {
++		handled = false;
++	}
++
++early_exit:
++	spin_unlock(&bi->lock);
++
++	return handled ? IRQ_HANDLED : IRQ_NONE;
++}
++
++static int bcm2708_i2c_master_xfer(struct i2c_adapter *adap,
++	struct i2c_msg *msgs, int num)
++{
++	struct bcm2708_i2c *bi = adap->algo_data;
++	unsigned long flags;
++	int ret;
++
++	spin_lock_irqsave(&bi->lock, flags);
++
++	INIT_COMPLETION(bi->done);
++	bi->msg = msgs;
++	bi->pos = 0;
++	bi->nmsgs = num;
++	bi->error = false;
++
++	spin_unlock_irqrestore(&bi->lock, flags);
++
++	bcm2708_bsc_setup(bi);
++
++	ret = wait_for_completion_timeout(&bi->done,
++			msecs_to_jiffies(I2C_TIMEOUT_MS));
++	if (ret == 0) {
++		dev_err(&adap->dev, "transfer timed out\n");
++		spin_lock_irqsave(&bi->lock, flags);
++		bcm2708_bsc_reset(bi);
++		spin_unlock_irqrestore(&bi->lock, flags);
++		return -ETIMEDOUT;
++	}
++
++	return bi->error ? -EIO : num;
++}
++
++static u32 bcm2708_i2c_functionality(struct i2c_adapter *adap)
++{
++	return I2C_FUNC_I2C | /*I2C_FUNC_10BIT_ADDR |*/ I2C_FUNC_SMBUS_EMUL;
++}
++
++static struct i2c_algorithm bcm2708_i2c_algorithm = {
++	.master_xfer = bcm2708_i2c_master_xfer,
++	.functionality = bcm2708_i2c_functionality,
++};
++
++static int bcm2708_i2c_probe(struct platform_device *pdev)
++{
++	struct resource *regs;
++	int irq, err = -ENOMEM;
++	struct clk *clk;
++	struct bcm2708_i2c *bi;
++	struct i2c_adapter *adap;
++
++	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	if (!regs) {
++		dev_err(&pdev->dev, "could not get IO memory\n");
++		return -ENXIO;
++	}
++
++	irq = platform_get_irq(pdev, 0);
++	if (irq < 0) {
++		dev_err(&pdev->dev, "could not get IRQ\n");
++		return irq;
++	}
++
++	clk = clk_get(&pdev->dev, NULL);
++	if (IS_ERR(clk)) {
++		dev_err(&pdev->dev, "could not find clk: %ld\n", PTR_ERR(clk));
++		return PTR_ERR(clk);
++	}
++
++	bcm2708_i2c_init_pinmode(pdev->id);
++
++	bi = kzalloc(sizeof(*bi), GFP_KERNEL);
++	if (!bi)
++		goto out_clk_put;
++
++	platform_set_drvdata(pdev, bi);
++
++	adap = &bi->adapter;
++	adap->class = I2C_CLASS_HWMON | I2C_CLASS_DDC;
++	adap->algo = &bcm2708_i2c_algorithm;
++	adap->algo_data = bi;
++	adap->dev.parent = &pdev->dev;
++	adap->nr = pdev->id;
++	strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name));
++
++	switch (pdev->id) {
++	case 0:
++		adap->class = I2C_CLASS_HWMON;
++		break;
++	case 1:
++		adap->class = I2C_CLASS_DDC;
++		break;
++	default:
++		dev_err(&pdev->dev, "can only bind to BSC 0 or 1\n");
++		err = -ENXIO;
++		goto out_free_bi;
++	}
++
++	spin_lock_init(&bi->lock);
++	init_completion(&bi->done);
++
++	bi->base = ioremap(regs->start, resource_size(regs));
++	if (!bi->base) {
++		dev_err(&pdev->dev, "could not remap memory\n");
++		goto out_free_bi;
++	}
++
++	bi->irq = irq;
++	bi->clk = clk;
++
++	err = request_irq(irq, bcm2708_i2c_interrupt, IRQF_SHARED,
++			dev_name(&pdev->dev), bi);
++	if (err) {
++		dev_err(&pdev->dev, "could not request IRQ: %d\n", err);
++		goto out_iounmap;
++	}
++
++	bcm2708_bsc_reset(bi);
++
++	err = i2c_add_numbered_adapter(adap);
++	if (err < 0) {
++		dev_err(&pdev->dev, "could not add I2C adapter: %d\n", err);
++		goto out_free_irq;
++	}
++
++	dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %dk)\n",
++		pdev->id, (unsigned long)regs->start, irq, baudrate/1000);
++
++	return 0;
++
++out_free_irq:
++	free_irq(bi->irq, bi);
++out_iounmap:
++	iounmap(bi->base);
++out_free_bi:
++	kfree(bi);
++out_clk_put:
++	clk_put(clk);
++	return err;
++}
++
++static int bcm2708_i2c_remove(struct platform_device *pdev)
++{
++	struct bcm2708_i2c *bi = platform_get_drvdata(pdev);
++
++	platform_set_drvdata(pdev, NULL);
++
++	i2c_del_adapter(&bi->adapter);
++	free_irq(bi->irq, bi);
++	iounmap(bi->base);
++	clk_disable(bi->clk);
++	clk_put(bi->clk);
++	kfree(bi);
++
++	return 0;
++}
++
++static struct platform_driver bcm2708_i2c_driver = {
++	.driver		= {
++		.name	= DRV_NAME,
++		.owner	= THIS_MODULE,
++	},
++	.probe		= bcm2708_i2c_probe,
++	.remove		= bcm2708_i2c_remove,
++};
++
++// module_platform_driver(bcm2708_i2c_driver);
++
++
++static int __init bcm2708_i2c_init(void)
++{
++	return platform_driver_register(&bcm2708_i2c_driver);
++}
++
++static void __exit bcm2708_i2c_exit(void)
++{
++	platform_driver_unregister(&bcm2708_i2c_driver);
++}
++
++module_init(bcm2708_i2c_init);
++module_exit(bcm2708_i2c_exit);
++
++
++
++MODULE_DESCRIPTION("BSC controller driver for Broadcom BCM2708");
++MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:" DRV_NAME);
+diff -urN linux-3.10/drivers/i2c/busses/Kconfig linux-rpi-3.10.y/drivers/i2c/busses/Kconfig
+--- linux-3.10/drivers/i2c/busses/Kconfig	2013-06-30 23:13:29.000000000 +0100
++++ linux-rpi-3.10.y/drivers/i2c/busses/Kconfig	2013-07-06 15:25:50.000000000 +0100
+@@ -343,6 +343,25 @@
+ 	  This support is also available as a module.  If so, the module
+ 	  will be called i2c-bcm2835.
+ 
++config I2C_BCM2708
++	tristate "BCM2708 BSC"
++	depends on MACH_BCM2708
++	help
++	  Enabling this option will add BSC (Broadcom Serial Controller)
++	  support for the BCM2708. BSC is a Broadcom proprietary bus compatible
++	  with I2C/TWI/SMBus.
++
++config I2C_BCM2708_BAUDRATE
++    prompt "BCM2708 I2C baudrate"
++	depends on I2C_BCM2708
++    int
++    default 100000
++    help
++      Set the I2C baudrate. This will alter the default value. A
++      different baudrate can be set by using a module parameter as well. If
++      no parameter is provided when loading, this is the value that will be
++      used.
++
+ config I2C_BLACKFIN_TWI
+ 	tristate "Blackfin TWI I2C support"
+ 	depends on BLACKFIN
+diff -urN linux-3.10/drivers/i2c/busses/Makefile linux-rpi-3.10.y/drivers/i2c/busses/Makefile
+--- linux-3.10/drivers/i2c/busses/Makefile	2013-06-30 23:13:29.000000000 +0100
++++ linux-rpi-3.10.y/drivers/i2c/busses/Makefile	2013-07-06 15:25:50.000000000 +0100
+@@ -32,6 +32,7 @@
+ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
+ obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
+ obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
++obj-$(CONFIG_I2C_BCM2708)	+= i2c-bcm2708.o
+ obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
+ obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
+ obj-$(CONFIG_I2C_CPM)		+= i2c-cpm.o