From de69c9edb0665d43ba2caf7fb3f79200f91eb6fc Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 9 Jul 2013 20:52:49 +0000 Subject: brcm2708: add support for 3.10 kernel Signed-off-by: Florian Fainelli SVN-Revision: 37218 --- .../patches-3.10/015-bcm2708-i2c-driver.patch | 452 +++++++++++++++++++++ 1 file changed, 452 insertions(+) create mode 100644 target/linux/brcm2708/patches-3.10/015-bcm2708-i2c-driver.patch (limited to 'target/linux/brcm2708/patches-3.10/015-bcm2708-i2c-driver.patch') 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 ++ * ++ * 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 ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++/* 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 "); ++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 -- cgit v1.2.3