start gpio driver

mips/Makefile.arch

@@ -28,7 +28,7 @@ arch_kernel_sources = mips/interrupts.cc mips/test.cc mips/arch.cc
 boot_sources = mips/init.cc
 BUILT_SOURCES = $(kernel_sources) $(boot_sources)
 arch_headers = mips/arch.hh mips/jz4730.hh
-boot_threads = keyboard lcd
+boot_threads = gpio lcd
 
 uimage:
 

mips/entry.S

@@ -236,5 +236,5 @@ thread0:
 	.incbin "lcd"
 	.balign 0x1000
 thread1:
-	.incbin "keyboard"
+	.incbin "gpio"
 thread2:

mips/init.ccp

@@ -238,6 +238,13 @@ void init (unsigned mem):
 	// Set up initial threads.
 	init_threads ()
 
+	// Disable all gpio pins initially.
+	for unsigned i = 0; i < 4; ++i:
+		GPIO_GPIER (i) = 0
+		GPIO_GPDIR (i) = 0
+		GPIO_GPPUR (i) = 0
+		GPIO_GPALR (i) = 0
+		GPIO_GPAUR (i) = 0
 	// Set up the rest of the hardware (copied from Linux).
 	cpm_idle_mode ()
 	cpm_enable_cko1 ()
@@ -253,10 +260,6 @@ void init (unsigned mem):
 	gpio_as_lcd_master ()
 	gpio_as_ssi()
 	gpio_as_msc ()
-	GPIO_GPDIR (GPIO_PWM0_PORT) |= 1 << GPIO_PWM0
-	GPIO_GPDR (GPIO_PWM0_PORT) |= 1 << GPIO_PWM0
-	GPIO_GPDIR (GPIO_USB_CLK_EN_PORT) |= 1 << GPIO_USB_CLK_EN
-	GPIO_GPDR (GPIO_USB_CLK_EN_PORT) |= 1 << GPIO_USB_CLK_EN
 
 	// Start the operating system timer, and set it to give an interrupt immediately.
 	// This is better, because the kernel starts with jumping into the idle task and