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Commit ddb7d1e9 authored by David Howells's avatar David Howells
Browse files

MN10300: Clear ASB2364 peripheral interrupt masks before enabling interrupts 



Clear the interrupt mask registers of ASB2364 peripherals before enabling
interrupts so that any peripherals that weren't dealt with by the bootloader
after a reboot (if there was one) won't cause an interrupt storm when
interrupts are first enabled before the drivers are initialised.

Also, attempt to reset the peripherals attached to the FPGA.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 02b2944c

arch/mn10300/unit-asb2364/irq-fpga.c

+11 −0
Original line number Diff line number Diff line
@@ -88,6 +88,17 @@ void __init irq_fpga_init(void) 
{

	int irq;



	ASB2364_FPGA_REG_MASK_LAN  = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_MASK_UART = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_MASK_I2C  = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_MASK_USB  = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_MASK_FPGA = 0x0001;

	SyncExBus();



	for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)

		set_irq_chip_and_handler(irq, &asb2364_fpga_pic, handle_level_irq);

arch/mn10300/unit-asb2364/unit-init.c

+44 −0
Original line number Diff line number Diff line
@@ -20,13 +20,41 @@ 
#include <asm/processor.h>

#include <asm/irq.h>

#include <asm/intctl-regs.h>

#include <asm/serial-regs.h>

#include <unit/fpga-regs.h>

#include <unit/serial.h>

#include <unit/smsc911x.h>



#define TTYS0_SERIAL_IER	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 2, u8)

#define LAN_IRQ_CFG		__SYSREG(SMSC911X_BASE + 0x54, u32)

#define LAN_INT_EN		__SYSREG(SMSC911X_BASE + 0x5c, u32)



/*

 * initialise some of the unit hardware before gdbstub is set up

 */

asmlinkage void __init unit_init(void)

{

	/* Make sure we aren't going to get unexpected interrupts */

	TTYS0_SERIAL_IER = 0;

	SC0RXICR = 0;

	SC0TXICR = 0;

	SC1RXICR = 0;

	SC1TXICR = 0;

	SC2RXICR = 0;

	SC2TXICR = 0;



	/* Attempt to reset the FPGA attached peripherals */

	ASB2364_FPGA_REG_RESET_LAN = 0x0000;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_UART = 0x0000;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_I2C = 0x0000;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_USB = 0x0000;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_AV = 0x0000;

	SyncExBus();



	/* set up the external interrupts */



	/* XIRQ[0]: NAND RXBY */
@@ -56,7 +84,23 @@ asmlinkage void __init unit_init(void) 
 */

asmlinkage void __init unit_setup(void)

{

	/* Release the reset on the SMSC911X so that it is ready by the time we

	 * need it */

	ASB2364_FPGA_REG_RESET_LAN = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_UART = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_I2C = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_USB = 0x0001;

	SyncExBus();

	ASB2364_FPGA_REG_RESET_AV = 0x0001;

	SyncExBus();



	/* Make sure the ethernet chipset isn't going to give us an interrupt

	 * storm from stuff it was doing pre-reset */

	LAN_IRQ_CFG = 0;

	LAN_INT_EN = 0;

}



/*