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-rw-r--r--target/linux/brcm2708/patches-4.1/0020-Add-Chris-Boot-s-i2c-driver.patch792
1 files changed, 0 insertions, 792 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0020-Add-Chris-Boot-s-i2c-driver.patch b/target/linux/brcm2708/patches-4.1/0020-Add-Chris-Boot-s-i2c-driver.patch
deleted file mode 100644
index 07bf8ab0b4..0000000000
--- a/target/linux/brcm2708/patches-4.1/0020-Add-Chris-Boot-s-i2c-driver.patch
+++ /dev/null
@@ -1,792 +0,0 @@
-From b26c77b60932d188fc5cdd6295f9621d2082178e Mon Sep 17 00:00:00 2001
-From: popcornmix <popcornmix@gmail.com>
-Date: Wed, 17 Jun 2015 15:44:08 +0100
-Subject: [PATCH 020/222] Add Chris Boot's i2c driver
-
-i2c-bcm2708: fixed baudrate
-
-Fixed issue where the wrong CDIV value was set for baudrates below 3815 Hz (for 250MHz bus clock).
-In that case the computed CDIV value was more than 0xffff. However the CDIV register width is only 16 bits.
-This resulted in incorrect setting of CDIV and higher baudrate than intended.
-Example: 3500Hz -> CDIV=0x11704 -> CDIV(16bit)=0x1704 -> 42430Hz
-After correction: 3500Hz -> CDIV=0x11704 -> CDIV(16bit)=0xffff -> 3815Hz
-The correct baudrate is shown in the log after the cdiv > 0xffff correction.
-
-Perform I2C combined transactions when possible
-
-Perform I2C combined transactions whenever possible, within the
-restrictions of the Broadcomm Serial Controller.
-
-Disable DONE interrupt during TA poll
-
-Prevent interrupt from being triggered if poll is missed and transfer
-starts and finishes.
-
-i2c: Make combined transactions optional and disabled by default
-
-i2c: bcm2708: add device tree support
-
-Add DT support to driver and add to .dtsi file.
-Setup pins in .dts file.
-i2c is disabled by default.
-
-Signed-off-by: Noralf Tronnes <notro@tronnes.org>
-
-bcm2708: don't register i2c controllers when using DT
-
-The devices for the i2c controllers are in the Device Tree.
-Only register devices when not using DT.
-
-Signed-off-by: Noralf Tronnes <notro@tronnes.org>
-
-I2C: Only register the I2C device for the current board revision
-
-i2c_bcm2708: Fix clock reference counting
-
-Fix grabbing lock from atomic context in i2c driver
-
-2 main changes:
-- check for timeouts in the bcm2708_bsc_setup function as indicated by this comment:
- /* poll for transfer start bit (should only take 1-20 polls) */
- This implies that the setup function can now fail so account for this everywhere it's called
-- Removed the clk_get_rate call from inside the setup function as it locks a mutex and that's not ok since we call it from under a spin lock.
-
-i2c-bcm2708: When using DT, leave the GPIO setup to pinctrl
----
- arch/arm/mach-bcm2708/bcm2708.c | 51 ++++
- arch/arm/mach-bcm2709/bcm2709.c | 51 ++++
- drivers/i2c/busses/Kconfig | 21 +-
- drivers/i2c/busses/Makefile | 2 +
- drivers/i2c/busses/i2c-bcm2708.c | 522 +++++++++++++++++++++++++++++++++++++++
- 5 files changed, 646 insertions(+), 1 deletion(-)
- create mode 100644 drivers/i2c/busses/i2c-bcm2708.c
-
---- a/arch/arm/mach-bcm2708/bcm2708.c
-+++ b/arch/arm/mach-bcm2708/bcm2708.c
-@@ -83,6 +83,7 @@ static unsigned uart_clock = UART0_CLOCK
- static unsigned disk_led_gpio = 16;
- static unsigned disk_led_active_low = 1;
- static unsigned reboot_part = 0;
-+static bool vc_i2c_override = false;
-
- static unsigned use_dt = 0;
-
-@@ -550,6 +551,45 @@ static struct spi_board_info bcm2708_spi
- };
- #endif
-
-+static struct resource bcm2708_bsc0_resources[] = {
-+ {
-+ .start = BSC0_BASE,
-+ .end = BSC0_BASE + SZ_256 - 1,
-+ .flags = IORESOURCE_MEM,
-+ }, {
-+ .start = INTERRUPT_I2C,
-+ .end = INTERRUPT_I2C,
-+ .flags = IORESOURCE_IRQ,
-+ }
-+};
-+
-+static struct platform_device bcm2708_bsc0_device = {
-+ .name = "bcm2708_i2c",
-+ .id = 0,
-+ .num_resources = ARRAY_SIZE(bcm2708_bsc0_resources),
-+ .resource = bcm2708_bsc0_resources,
-+};
-+
-+
-+static struct resource bcm2708_bsc1_resources[] = {
-+ {
-+ .start = BSC1_BASE,
-+ .end = BSC1_BASE + SZ_256 - 1,
-+ .flags = IORESOURCE_MEM,
-+ }, {
-+ .start = INTERRUPT_I2C,
-+ .end = INTERRUPT_I2C,
-+ .flags = IORESOURCE_IRQ,
-+ }
-+};
-+
-+static struct platform_device bcm2708_bsc1_device = {
-+ .name = "bcm2708_i2c",
-+ .id = 1,
-+ .num_resources = ARRAY_SIZE(bcm2708_bsc1_resources),
-+ .resource = bcm2708_bsc1_resources,
-+};
-+
- static struct platform_device bcm2835_thermal_device = {
- .name = "bcm2835_thermal",
- };
-@@ -702,6 +742,15 @@ void __init bcm2708_init(void)
-
- bcm_register_device_dt(&bcm2708_spi_device);
-
-+ if (vc_i2c_override) {
-+ bcm_register_device_dt(&bcm2708_bsc0_device);
-+ bcm_register_device_dt(&bcm2708_bsc1_device);
-+ } else if ((boardrev & 0xffffff) == 0x2 || (boardrev & 0xffffff) == 0x3) {
-+ bcm_register_device_dt(&bcm2708_bsc0_device);
-+ } else {
-+ bcm_register_device_dt(&bcm2708_bsc1_device);
-+ }
-+
- bcm_register_device_dt(&bcm2835_thermal_device);
-
- if (!use_dt) {
-@@ -893,3 +942,5 @@ module_param(uart_clock, uint, 0644);
- module_param(disk_led_gpio, uint, 0644);
- module_param(disk_led_active_low, uint, 0644);
- module_param(reboot_part, uint, 0644);
-+module_param(vc_i2c_override, bool, 0644);
-+MODULE_PARM_DESC(vc_i2c_override, "Allow the use of VC's I2C peripheral.");
---- a/arch/arm/mach-bcm2709/bcm2709.c
-+++ b/arch/arm/mach-bcm2709/bcm2709.c
-@@ -85,6 +85,7 @@ static unsigned uart_clock = UART0_CLOCK
- static unsigned disk_led_gpio = 16;
- static unsigned disk_led_active_low = 1;
- static unsigned reboot_part = 0;
-+static bool vc_i2c_override = false;
-
- static unsigned use_dt = 0;
-
-@@ -570,6 +571,45 @@ static struct spi_board_info bcm2708_spi
- };
- #endif
-
-+static struct resource bcm2708_bsc0_resources[] = {
-+ {
-+ .start = BSC0_BASE,
-+ .end = BSC0_BASE + SZ_256 - 1,
-+ .flags = IORESOURCE_MEM,
-+ }, {
-+ .start = INTERRUPT_I2C,
-+ .end = INTERRUPT_I2C,
-+ .flags = IORESOURCE_IRQ,
-+ }
-+};
-+
-+static struct platform_device bcm2708_bsc0_device = {
-+ .name = "bcm2708_i2c",
-+ .id = 0,
-+ .num_resources = ARRAY_SIZE(bcm2708_bsc0_resources),
-+ .resource = bcm2708_bsc0_resources,
-+};
-+
-+
-+static struct resource bcm2708_bsc1_resources[] = {
-+ {
-+ .start = BSC1_BASE,
-+ .end = BSC1_BASE + SZ_256 - 1,
-+ .flags = IORESOURCE_MEM,
-+ }, {
-+ .start = INTERRUPT_I2C,
-+ .end = INTERRUPT_I2C,
-+ .flags = IORESOURCE_IRQ,
-+ }
-+};
-+
-+static struct platform_device bcm2708_bsc1_device = {
-+ .name = "bcm2708_i2c",
-+ .id = 1,
-+ .num_resources = ARRAY_SIZE(bcm2708_bsc1_resources),
-+ .resource = bcm2708_bsc1_resources,
-+};
-+
- static struct platform_device bcm2835_thermal_device = {
- .name = "bcm2835_thermal",
- };
-@@ -722,6 +762,15 @@ void __init bcm2709_init(void)
-
- bcm_register_device_dt(&bcm2708_spi_device);
-
-+ if (vc_i2c_override) {
-+ bcm_register_device_dt(&bcm2708_bsc0_device);
-+ bcm_register_device_dt(&bcm2708_bsc1_device);
-+ } else if ((boardrev & 0xffffff) == 0x2 || (boardrev & 0xffffff) == 0x3) {
-+ bcm_register_device_dt(&bcm2708_bsc0_device);
-+ } else {
-+ bcm_register_device_dt(&bcm2708_bsc1_device);
-+ }
-+
- bcm_register_device_dt(&bcm2835_thermal_device);
-
- if (!use_dt) {
-@@ -1061,3 +1110,5 @@ module_param(uart_clock, uint, 0644);
- module_param(disk_led_gpio, uint, 0644);
- module_param(disk_led_active_low, uint, 0644);
- module_param(reboot_part, uint, 0644);
-+module_param(vc_i2c_override, bool, 0644);
-+MODULE_PARM_DESC(vc_i2c_override, "Allow the use of VC's I2C peripheral.");
---- a/drivers/i2c/busses/Kconfig
-+++ b/drivers/i2c/busses/Kconfig
-@@ -8,6 +8,25 @@ menu "I2C Hardware Bus support"
- comment "PC SMBus host controller drivers"
- depends on PCI
-
-+config I2C_BCM2708
-+ tristate "BCM2708 BSC"
-+ depends on MACH_BCM2708 || MACH_BCM2709
-+ 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_ALI1535
- tristate "ALI 1535"
- depends on PCI
-@@ -362,7 +381,7 @@ config I2C_AXXIA
-
- config I2C_BCM2835
- tristate "Broadcom BCM2835 I2C controller"
-- depends on ARCH_BCM2835
-+ depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709
- help
- If you say yes to this option, support will be included for the
- BCM2835 I2C controller.
---- a/drivers/i2c/busses/Makefile
-+++ b/drivers/i2c/busses/Makefile
-@@ -2,6 +2,8 @@
- # Makefile for the i2c bus drivers.
- #
-
-+obj-$(CONFIG_I2C_BCM2708) += i2c-bcm2708.o
-+
- # ACPI drivers
- obj-$(CONFIG_I2C_SCMI) += i2c-scmi.o
-
---- /dev/null
-+++ b/drivers/i2c/busses/i2c-bcm2708.c
-@@ -0,0 +1,522 @@
-+/*
-+ * 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/of.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 I2C_WAIT_LOOP_COUNT 40
-+
-+#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");
-+
-+static bool combined = false;
-+module_param(combined, bool, 0644);
-+MODULE_PARM_DESC(combined, "Use combined transactions");
-+
-+struct bcm2708_i2c {
-+ struct i2c_adapter adapter;
-+
-+ spinlock_t lock;
-+ void __iomem *base;
-+ int irq;
-+ struct clk *clk;
-+ u32 cdiv;
-+
-+ 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(GPIO_BASE, 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 int bcm2708_bsc_setup(struct bcm2708_i2c *bi)
-+{
-+ u32 cdiv, s;
-+ u32 c = BSC_C_I2CEN | BSC_C_INTD | BSC_C_ST | BSC_C_CLEAR_1;
-+ int wait_loops = I2C_WAIT_LOOP_COUNT;
-+
-+ /* Can't call clk_get_rate as it locks a mutex and here we are spinlocked.
-+ * Use the value that we cached in the probe.
-+ */
-+ cdiv = bi->cdiv;
-+
-+ 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);
-+ if (combined)
-+ {
-+ /* Do the next two messages meet combined transaction criteria?
-+ - Current message is a write, next message is a read
-+ - Both messages to same slave address
-+ - Write message can fit inside FIFO (16 bytes or less) */
-+ if ( (bi->nmsgs > 1) &&
-+ !(bi->msg[0].flags & I2C_M_RD) && (bi->msg[1].flags & I2C_M_RD) &&
-+ (bi->msg[0].addr == bi->msg[1].addr) && (bi->msg[0].len <= 16)) {
-+ /* Fill FIFO with entire write message (16 byte FIFO) */
-+ while (bi->pos < bi->msg->len) {
-+ bcm2708_wr(bi, BSC_FIFO, bi->msg->buf[bi->pos++]);
-+ }
-+ /* Start write transfer (no interrupts, don't clear FIFO) */
-+ bcm2708_wr(bi, BSC_C, BSC_C_I2CEN | BSC_C_ST);
-+
-+ /* poll for transfer start bit (should only take 1-20 polls) */
-+ do {
-+ s = bcm2708_rd(bi, BSC_S);
-+ } while (!(s & (BSC_S_TA | BSC_S_ERR | BSC_S_CLKT | BSC_S_DONE)) && --wait_loops >= 0);
-+
-+ /* did we time out or some error occured? */
-+ if (wait_loops < 0 || (s & (BSC_S_ERR | BSC_S_CLKT))) {
-+ return -1;
-+ }
-+
-+ /* Send next read message before the write transfer finishes. */
-+ bi->nmsgs--;
-+ bi->msg++;
-+ bi->pos = 0;
-+ bcm2708_wr(bi, BSC_DLEN, bi->msg->len);
-+ c = BSC_C_I2CEN | BSC_C_INTD | BSC_C_INTR | BSC_C_ST | BSC_C_READ;
-+ }
-+ }
-+ bcm2708_wr(bi, BSC_C, c);
-+
-+ return 0;
-+}
-+
-+static irqreturn_t bcm2708_i2c_interrupt(int irq, void *dev_id)
-+{
-+ struct bcm2708_i2c *bi = dev_id;
-+ bool handled = true;
-+ u32 s;
-+ int ret;
-+
-+ 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;
-+
-+ bi->msg = 0; /* to inform the that all work is done */
-+ bi->nmsgs = 0;
-+ /* 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;
-+ ret = bcm2708_bsc_setup(bi);
-+ if (ret < 0) {
-+ bcm2708_bsc_reset(bi);
-+ bi->error = true;
-+ bi->msg = 0; /* to inform the that all work is done */
-+ bi->nmsgs = 0;
-+ /* wake up our bh */
-+ complete(&bi->done);
-+ goto early_exit;
-+ }
-+ } else {
-+ bi->msg = 0; /* to inform the that all work is done */
-+ bi->nmsgs = 0;
-+ /* 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);
-+
-+ reinit_completion(&bi->done);
-+ bi->msg = msgs;
-+ bi->pos = 0;
-+ bi->nmsgs = num;
-+ bi->error = false;
-+
-+ ret = bcm2708_bsc_setup(bi);
-+
-+ spin_unlock_irqrestore(&bi->lock, flags);
-+
-+ /* check the result of the setup */
-+ if (ret < 0)
-+ {
-+ dev_err(&adap->dev, "transfer setup timed out\n");
-+ goto error_timeout;
-+ }
-+
-+ ret = wait_for_completion_timeout(&bi->done, msecs_to_jiffies(I2C_TIMEOUT_MS));
-+ if (ret == 0) {
-+ dev_err(&adap->dev, "transfer timed out\n");
-+ goto error_timeout;
-+ }
-+
-+ ret = bi->error ? -EIO : num;
-+ return ret;
-+
-+error_timeout:
-+ spin_lock_irqsave(&bi->lock, flags);
-+ bcm2708_bsc_reset(bi);
-+ bi->msg = 0; /* to inform the interrupt handler that there's nothing else to be done */
-+ bi->nmsgs = 0;
-+ spin_unlock_irqrestore(&bi->lock, flags);
-+ return -ETIMEDOUT;
-+}
-+
-+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;
-+ unsigned long bus_hz;
-+ u32 cdiv;
-+
-+ if (pdev->dev.of_node) {
-+ u32 bus_clk_rate;
-+ pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
-+ if (pdev->id < 0) {
-+ dev_err(&pdev->dev, "alias is missing\n");
-+ return -EINVAL;
-+ }
-+ if (!of_property_read_u32(pdev->dev.of_node,
-+ "clock-frequency", &bus_clk_rate))
-+ baudrate = bus_clk_rate;
-+ else
-+ dev_warn(&pdev->dev,
-+ "Could not read clock-frequency property\n");
-+ }
-+
-+ 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);
-+ }
-+
-+ err = clk_prepare_enable(clk);
-+ if (err) {
-+ dev_err(&pdev->dev, "could not enable clk: %d\n", err);
-+ goto out_clk_put;
-+ }
-+
-+ if (!pdev->dev.of_node)
-+ bcm2708_i2c_init_pinmode(pdev->id);
-+
-+ bi = kzalloc(sizeof(*bi), GFP_KERNEL);
-+ if (!bi)
-+ goto out_clk_disable;
-+
-+ 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));
-+ adap->dev.of_node = pdev->dev.of_node;
-+
-+ 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;
-+ }
-+
-+ bus_hz = clk_get_rate(bi->clk);
-+ cdiv = bus_hz / baudrate;
-+ if (cdiv > 0xffff) {
-+ cdiv = 0xffff;
-+ baudrate = bus_hz / cdiv;
-+ }
-+ bi->cdiv = cdiv;
-+
-+ dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %d)\n",
-+ pdev->id, (unsigned long)regs->start, irq, baudrate);
-+
-+ return 0;
-+
-+out_free_irq:
-+ free_irq(bi->irq, bi);
-+out_iounmap:
-+ iounmap(bi->base);
-+out_free_bi:
-+ kfree(bi);
-+out_clk_disable:
-+ clk_disable_unprepare(clk);
-+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_unprepare(bi->clk);
-+ clk_put(bi->clk);
-+ kfree(bi);
-+
-+ return 0;
-+}
-+
-+static const struct of_device_id bcm2708_i2c_of_match[] = {
-+ { .compatible = "brcm,bcm2708-i2c" },
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, bcm2708_i2c_of_match);
-+
-+static struct platform_driver bcm2708_i2c_driver = {
-+ .driver = {
-+ .name = DRV_NAME,
-+ .owner = THIS_MODULE,
-+ .of_match_table = bcm2708_i2c_of_match,
-+ },
-+ .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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-11 17:01:58 +0000