embox

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package embox.driver.gpio
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module bcm283x_gpio extends api {
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	/* 	RPI_VERSION == 0 then 0x20200000
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		RPI_VERSION == 3 then 0x3F200000
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		RPI_VERSION == 4 then 0xFE200000
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	*/
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	option number base_addr = 0x20200000
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	/* Pi Zero configuration (RPI_VERSION == 0) */
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	option number gpio_pins = 54
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	/* Port A has 0-31 pins, Port B has 32-53 pins numbered as 0-21 */
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	option number gpio_ports = 2
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	/* There is confusion about this.  There are three banks, only the first two
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	 * are linked to pins 0-53 (internally, of those, not all are on GPIO header)
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	 * An interrupt exists for each bank and the highest interrupt is for any 
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	 * GPIO pin.  We set just one, just the first bank for 
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	 * all pins connected to the 40-pin header.
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	 * 
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	 * Bank0( pins:  0-31 ) - 49 (interrupt)
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	 * Bank1( pins: 32-53 ) - 50 			 
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	 * Bank2( pins: 54-96 ) - 51 (not used)
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	 * all  ( pins: 00-96 ) - 52 
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	 */
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	option number gpu_irq_int = 49
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	/* Due to architecture constraints, setting of pull-up/down can only be 
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	 * applied accross all pins at the same time.  Hence, shadow registers 
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	 * exist in driver implementation to allow setting value to apply
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	 * per pin, then by applying _any_ setting to this pin (settings are
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	 * ignored in this case) with gpio_setup_mode() will cause the 
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	 * aggreggated pins settings to be applied for pull-up/down
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	 * functionality. All other functionality will be applied immediately.
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	 */
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	/* Bit mask for pullups, defaults set to as per BCM2835 ARM Peripherals
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	 * sec. 6.2 defaults for GPIO 0 thru 53
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	 */
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	option number gpu_pullup_porta_float = 0x30000000
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	option number gpu_pullup_porta_down  = 0xCFFFFE00
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	option number gpu_pullup_porta_up    = 0x000001FF
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	option number gpu_pullup_portb_float = 0x00003000
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	option number gpu_pullup_portb_down  = 0x00000FE3
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	option number gpu_pullup_portb_up    = 0x003FC01C
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	option string log_level="LOG_NONE"
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	source "bcm283x_gpio.c"
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	source "bcm283x_gpio.h"
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	/* User API */
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	@IncludeExport(path="drivers/gpio/bcm283x")
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	source "bcm283x_gpio.h"
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	depends embox.driver.gpio.core
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	depends embox.arch.arm.libarch.delay
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}
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