diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch | 264 |
1 files changed, 0 insertions, 264 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 deleted file mode 100644 index 92aaea5..0000000 --- a/target/linux/brcm2708/patches-3.18/0021-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch +++ /dev/null @@ -1,264 +0,0 @@ -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(-) - ---- 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_dm - .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); ---- 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 platf - 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 - 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 - 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 platfor - - w1_remove_master_device(master); - -+ pdata->pin = w1_gpio_pin_orig; -+ pdata->ext_pullup_enable_pin = w1_gpio_pullup_orig; -+ - return 0; - } - ---- 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); - }; ---- a/drivers/w1/w1_int.c -+++ b/drivers/w1/w1_int.c -@@ -123,6 +123,20 @@ int w1_add_master_device(struct w1_bus_m - 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). */ ---- a/drivers/w1/w1_io.c -+++ b/drivers/w1/w1_io.c -@@ -134,10 +134,22 @@ static void w1_pre_write(struct w1_maste - 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; - } - } |