diff options
Diffstat (limited to 'packages/linux/linux-rp-2.6.24/tosa/0056-Support-resetting-by-asserting-GPIO-pin.patch')
| -rw-r--r-- | packages/linux/linux-rp-2.6.24/tosa/0056-Support-resetting-by-asserting-GPIO-pin.patch | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/packages/linux/linux-rp-2.6.24/tosa/0056-Support-resetting-by-asserting-GPIO-pin.patch b/packages/linux/linux-rp-2.6.24/tosa/0056-Support-resetting-by-asserting-GPIO-pin.patch new file mode 100644 index 0000000000..99220f9200 --- /dev/null +++ b/packages/linux/linux-rp-2.6.24/tosa/0056-Support-resetting-by-asserting-GPIO-pin.patch @@ -0,0 +1,126 @@ +From e039614a0ce6df645f8fa4cbe32e4b21fe46a288 Mon Sep 17 00:00:00 2001 +From: Dmitry Baryshkov <dbaryshkov@gmail.com> +Date: Sun, 20 Jan 2008 02:44:03 +0300 +Subject: [PATCH 56/64] Support resetting by asserting GPIO pin + +This adds support for resetting via assertion of GPIO pin. +This e.g. is used on Sharp Zaurus SL-6000. + +Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> +--- + arch/arm/mach-pxa/gpio.c | 43 +++++++++++++++++++++++++++++++++++++ + arch/arm/mach-pxa/pm.c | 4 +- + include/asm-arm/arch-pxa/system.h | 10 ++++++++ + 3 files changed, 55 insertions(+), 2 deletions(-) + +diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c +index 8638dd7..589da3b 100644 +--- a/arch/arm/mach-pxa/gpio.c ++++ b/arch/arm/mach-pxa/gpio.c +@@ -19,6 +19,7 @@ + #include <asm/hardware.h> + #include <asm/io.h> + #include <asm/arch/pxa-regs.h> ++#include <asm/arch/system.h> + + #include "generic.h" + +@@ -194,4 +195,46 @@ void __init pxa_init_gpio(int gpio_nr) + pxa_gpio_chip[i/32].chip.ngpio = gpio_nr - i; + gpiochip_add(&pxa_gpio_chip[i/32].chip); + } ++ ++ if (reset_gpio < gpio_nr) ++ init_reset_gpio(); ++} ++ ++int reset_gpio = -1; ++static int __init reset_gpio_setup(char *str) ++{ ++ if (get_option(&str, &reset_gpio) != 1) { ++ printk(KERN_ERR "reset_gpio: bad value secified"); ++ return 0; ++ } ++ ++ return 1; ++} ++ ++__setup("reset_gpio=", reset_gpio_setup); ++ ++int init_reset_gpio(void) ++{ ++ int rc = 0; ++ if (reset_gpio == -1) ++ goto out; ++ ++ rc = gpio_request(reset_gpio, "reset generator"); ++ if (rc) { ++ printk(KERN_ERR "Can't request reset_gpio\n"); ++ goto out; ++ } ++ ++ rc = gpio_direction_input(reset_gpio); ++ if (rc) { ++ printk(KERN_ERR "Can't configure reset_gpio for input\n"); ++ gpio_free(reset_gpio); ++ goto out; ++ } ++ ++out: ++ if (rc) ++ reset_gpio = -1; ++ ++ return rc; + } +diff --git a/arch/arm/mach-pxa/pm.c b/arch/arm/mach-pxa/pm.c +index a941c71..64f37e5 100644 +--- a/arch/arm/mach-pxa/pm.c ++++ b/arch/arm/mach-pxa/pm.c +@@ -40,8 +40,8 @@ int pxa_pm_enter(suspend_state_t state) + + pxa_cpu_pm_fns->save(sleep_save); + +- /* Clear sleep reset status */ +- RCSR = RCSR_SMR; ++ /* Clear reset status */ ++ RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR; + + /* before sleeping, calculate and save a checksum */ + for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) +diff --git a/include/asm-arm/arch-pxa/system.h b/include/asm-arm/arch-pxa/system.h +index 1d56a3e..c075018 100644 +--- a/include/asm-arm/arch-pxa/system.h ++++ b/include/asm-arm/arch-pxa/system.h +@@ -11,6 +11,7 @@ + */ + + #include <asm/proc-fns.h> ++#include <asm/gpio.h> + #include "hardware.h" + #include "pxa-regs.h" + +@@ -19,12 +20,21 @@ static inline void arch_idle(void) + cpu_do_idle(); + } + ++extern int reset_gpio; ++ ++int init_reset_gpio(void); + + static inline void arch_reset(char mode) + { ++ RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR; ++ + if (mode == 's') { + /* Jump into ROM at address 0 */ + cpu_reset(0); ++ } else if (mode == 'g' && reset_gpio != -1) { ++ /* Use GPIO reset */ ++ gpio_direction_output(reset_gpio, 0); ++ gpio_set_value(reset_gpio, 1); + } else { + /* Initialize the watchdog and let it fire */ + OWER = OWER_WME; +-- +1.5.3.8 + |