diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch')
| -rwxr-xr-x | target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch b/target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch new file mode 100755 index 0000000000..b2d715c57f --- /dev/null +++ b/target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch @@ -0,0 +1,277 @@ +From bd7d1508a83c544f2d52f668ebabe55c2ea207c5 Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Wed, 8 May 2013 11:46:50 +0100 +Subject: [PATCH 021/114] enabling the realtime clock 1-wire chip DS1307 and + 1-wire on GPIO4 (as a module) + +1-wire: Add support for configuring pin for w1-gpio kernel module +See: https://github.com/raspberrypi/linux/pull/457 + +Add bitbanging pullups, use them for w1-gpio + +Allows parasite power to work, uses module option pullup=1 + +bcm2708: Ensure 1-wire pullup is disabled by default, and expose as module parameter + +Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk> + +w1-gpio: Add gpiopin module parameter and correctly free up gpio pull-up pin, if set + +Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk> +--- + arch/arm/mach-bcm2708/bcm2708.c | 29 ++++++++++++++++++++++ + drivers/w1/masters/w1-gpio.c | 55 +++++++++++++++++++++++++++++++++++++---- + drivers/w1/w1.h | 6 +++++ + drivers/w1/w1_int.c | 14 +++++++++++ + drivers/w1/w1_io.c | 18 +++++++++++--- + 5 files changed, 114 insertions(+), 8 deletions(-) + +diff --git a/arch/arm/mach-bcm2708/bcm2708.c b/arch/arm/mach-bcm2708/bcm2708.c +index 82f56fb..7dd89a7f 100644 +--- a/arch/arm/mach-bcm2708/bcm2708.c ++++ b/arch/arm/mach-bcm2708/bcm2708.c +@@ -32,6 +32,7 @@ + #include <linux/io.h> + #include <linux/module.h> + #include <linux/spi/spi.h> ++#include <linux/w1-gpio.h> + + #include <linux/version.h> + #include <linux/clkdev.h> +@@ -76,12 +77,19 @@ + */ + #define DMA_MASK_BITS_COMMON 32 + ++// use GPIO 4 for the one-wire GPIO pin, if enabled ++#define W1_GPIO 4 ++// ensure one-wire GPIO pullup is disabled by default ++#define W1_PULLUP -1 ++ + /* command line parameters */ + static unsigned boardrev, serial; + static unsigned uart_clock; + static unsigned disk_led_gpio = 16; + static unsigned disk_led_active_low = 1; + static unsigned reboot_part = 0; ++static unsigned w1_gpio_pin = W1_GPIO; ++static unsigned w1_gpio_pullup = W1_PULLUP; + + static void __init bcm2708_init_led(void); + +@@ -258,6 +266,20 @@ static struct platform_device bcm2708_dmaman_device = { + .num_resources = ARRAY_SIZE(bcm2708_dmaman_resources), + }; + ++#if defined(CONFIG_W1_MASTER_GPIO) || defined(CONFIG_W1_MASTER_GPIO_MODULE) ++static struct w1_gpio_platform_data w1_gpio_pdata = { ++ .pin = W1_GPIO, ++ .ext_pullup_enable_pin = W1_PULLUP, ++ .is_open_drain = 0, ++}; ++ ++static struct platform_device w1_device = { ++ .name = "w1-gpio", ++ .id = -1, ++ .dev.platform_data = &w1_gpio_pdata, ++}; ++#endif ++ + static u64 fb_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON); + + static struct platform_device bcm2708_fb_device = { +@@ -652,6 +674,11 @@ void __init bcm2708_init(void) + #ifdef CONFIG_BCM2708_GPIO + bcm_register_device(&bcm2708_gpio_device); + #endif ++#if defined(CONFIG_W1_MASTER_GPIO) || defined(CONFIG_W1_MASTER_GPIO_MODULE) ++ w1_gpio_pdata.pin = w1_gpio_pin; ++ w1_gpio_pdata.ext_pullup_enable_pin = w1_gpio_pullup; ++ platform_device_register(&w1_device); ++#endif + bcm_register_device(&bcm2708_systemtimer_device); + bcm_register_device(&bcm2708_fb_device); + bcm_register_device(&bcm2708_usb_device); +@@ -853,3 +880,5 @@ 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(w1_gpio_pin, uint, 0644); ++module_param(w1_gpio_pullup, uint, 0644); +diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c +index 1d111e5..61be2cd 100644 +--- a/drivers/w1/masters/w1-gpio.c ++++ b/drivers/w1/masters/w1-gpio.c +@@ -23,6 +23,15 @@ + #include "../w1.h" + #include "../w1_int.h" + ++static int w1_gpio_pullup = -1; ++static int w1_gpio_pullup_orig = -1; ++module_param_named(pullup, w1_gpio_pullup, int, 0); ++MODULE_PARM_DESC(pullup, "GPIO pin pullup number"); ++static int w1_gpio_pin = -1; ++static int w1_gpio_pin_orig = -1; ++module_param_named(gpiopin, w1_gpio_pin, int, 0); ++MODULE_PARM_DESC(gpiopin, "GPIO pin number"); ++ + static u8 w1_gpio_set_pullup(void *data, int delay) + { + struct w1_gpio_platform_data *pdata = data; +@@ -67,6 +76,16 @@ static u8 w1_gpio_read_bit(void *data) + return gpio_get_value(pdata->pin) ? 1 : 0; + } + ++static void w1_gpio_bitbang_pullup(void *data, u8 on) ++{ ++ struct w1_gpio_platform_data *pdata = data; ++ ++ if (on) ++ gpio_direction_output(pdata->pin, 1); ++ else ++ gpio_direction_input(pdata->pin); ++} ++ + #if defined(CONFIG_OF) + static struct of_device_id w1_gpio_dt_ids[] = { + { .compatible = "w1-gpio" }, +@@ -113,13 +132,15 @@ static int w1_gpio_probe_dt(struct platform_device *pdev) + static int w1_gpio_probe(struct platform_device *pdev) + { + struct w1_bus_master *master; +- struct w1_gpio_platform_data *pdata; ++ struct w1_gpio_platform_data *pdata = pdev->dev.platform_data; + int err; + +- if (of_have_populated_dt()) { +- err = w1_gpio_probe_dt(pdev); +- if (err < 0) +- return err; ++ if(pdata == NULL) { ++ if (of_have_populated_dt()) { ++ err = w1_gpio_probe_dt(pdev); ++ if (err < 0) ++ return err; ++ } + } + + pdata = dev_get_platdata(&pdev->dev); +@@ -136,6 +157,19 @@ static int w1_gpio_probe(struct platform_device *pdev) + return -ENOMEM; + } + ++ w1_gpio_pin_orig = pdata->pin; ++ w1_gpio_pullup_orig = pdata->ext_pullup_enable_pin; ++ ++ if(gpio_is_valid(w1_gpio_pin)) { ++ pdata->pin = w1_gpio_pin; ++ pdata->ext_pullup_enable_pin = -1; ++ } ++ if(gpio_is_valid(w1_gpio_pullup)) { ++ pdata->ext_pullup_enable_pin = w1_gpio_pullup; ++ } ++ ++ dev_info(&pdev->dev, "gpio pin %d, gpio pullup pin %d\n", pdata->pin, pdata->ext_pullup_enable_pin); ++ + err = devm_gpio_request(&pdev->dev, pdata->pin, "w1"); + if (err) { + dev_err(&pdev->dev, "gpio_request (pin) failed\n"); +@@ -165,6 +199,14 @@ static int w1_gpio_probe(struct platform_device *pdev) + master->set_pullup = w1_gpio_set_pullup; + } + ++ if (gpio_is_valid(w1_gpio_pullup)) { ++ if (pdata->is_open_drain) ++ printk(KERN_ERR "w1-gpio 'pullup' option " ++ "doesn't work with open drain GPIO\n"); ++ else ++ master->bitbang_pullup = w1_gpio_bitbang_pullup; ++ } ++ + err = w1_add_master_device(master); + if (err) { + dev_err(&pdev->dev, "w1_add_master device failed\n"); +@@ -195,6 +237,9 @@ static int w1_gpio_remove(struct platform_device *pdev) + + w1_remove_master_device(master); + ++ pdata->pin = w1_gpio_pin_orig; ++ pdata->ext_pullup_enable_pin = w1_gpio_pullup_orig; ++ + return 0; + } + +diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h +index 56a49ba..881d728 100644 +--- a/drivers/w1/w1.h ++++ b/drivers/w1/w1.h +@@ -171,6 +171,12 @@ struct w1_bus_master + + u8 (*set_pullup)(void *, int); + ++ /** ++ * Turns the pullup on/off in bitbanging mode, takes an on/off argument. ++ * @return -1=Error, 0=completed ++ */ ++ void (*bitbang_pullup) (void *, u8); ++ + void (*search)(void *, struct w1_master *, + u8, w1_slave_found_callback); + }; +diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c +index 47249a3..a4b4a8d 100644 +--- a/drivers/w1/w1_int.c ++++ b/drivers/w1/w1_int.c +@@ -123,6 +123,20 @@ int w1_add_master_device(struct w1_bus_master *master) + return(-EINVAL); + } + ++ /* bitbanging hardware uses bitbang_pullup, other hardware uses set_pullup ++ * and takes care of timing itself */ ++ if (!master->write_byte && !master->touch_bit && master->set_pullup) { ++ printk(KERN_ERR "w1_add_master_device: set_pullup requires " ++ "write_byte or touch_bit, disabling\n"); ++ master->set_pullup = NULL; ++ } ++ ++ if (master->set_pullup && master->bitbang_pullup) { ++ printk(KERN_ERR "w1_add_master_device: set_pullup should not " ++ "be set when bitbang_pullup is used, disabling\n"); ++ master->set_pullup = NULL; ++ } ++ + /* Lock until the device is added (or not) to w1_masters. */ + mutex_lock(&w1_mlock); + /* Search for the first available id (starting at 1). */ +diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c +index 2820924..fd0550f 100644 +--- a/drivers/w1/w1_io.c ++++ b/drivers/w1/w1_io.c +@@ -134,10 +134,22 @@ static void w1_pre_write(struct w1_master *dev) + static void w1_post_write(struct w1_master *dev) + { + if (dev->pullup_duration) { +- if (dev->enable_pullup && dev->bus_master->set_pullup) +- dev->bus_master->set_pullup(dev->bus_master->data, 0); +- else ++ if (dev->enable_pullup) { ++ if (dev->bus_master->set_pullup) { ++ dev->bus_master->set_pullup(dev-> ++ bus_master->data, ++ 0); ++ } else if (dev->bus_master->bitbang_pullup) { ++ dev->bus_master-> ++ bitbang_pullup(dev->bus_master->data, 1); ++ msleep(dev->pullup_duration); ++ dev->bus_master-> ++ bitbang_pullup(dev->bus_master->data, 0); ++ } ++ } else { + msleep(dev->pullup_duration); ++ } ++ + dev->pullup_duration = 0; + } + } +-- +1.8.3.2 + |