/* * A20R specific code * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de) */ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/serial_8250.h> #include <asm/sni.h> #include <asm/time.h> #define PORT(_base,_irq) \ { \ .iobase = _base, \ .irq = _irq, \ .uartclk = 1843200, \ .iotype = UPIO_PORT, \ .flags = UPF_BOOT_AUTOCONF, \ } static struct plat_serial8250_port a20r_data[] = { PORT(0x3f8, 4), PORT(0x2f8, 3), { }, }; static struct platform_device a20r_serial8250_device = { .name = "serial8250", .id = PLAT8250_DEV_PLATFORM, .dev = { .platform_data = a20r_data, }, }; static struct resource a20r_ds1216_rsrc[] = { { .start = 0x1c081ffc, .end = 0x1c081fff, .flags = IORESOURCE_MEM } }; static struct platform_device a20r_ds1216_device = { .name = "rtc-ds1216", .num_resources = ARRAY_SIZE(a20r_ds1216_rsrc), .resource = a20r_ds1216_rsrc }; static struct resource snirm_82596_rsrc[] = { { .start = 0x18000000, .end = 0x18000004, .flags = IORESOURCE_MEM }, { .start = 0x18010000, .end = 0x18010004, .flags = IORESOURCE_MEM }, { .start = 0x1ff00000, .end = 0x1ff00020, .flags = IORESOURCE_MEM }, { .start = 22, .end = 22, .flags = IORESOURCE_IRQ }, { .flags = 0x01 /* 16bit mpu port access */ } }; static struct platform_device snirm_82596_pdev = { .name = "snirm_82596", .num_resources = ARRAY_SIZE(snirm_82596_rsrc), .resource = snirm_82596_rsrc }; static struct resource snirm_53c710_rsrc[] = { { .start = 0x19000000, .end = 0x190fffff, .flags = IORESOURCE_MEM }, { .start = 19, .end = 19, .flags = IORESOURCE_IRQ } }; static struct platform_device snirm_53c710_pdev = { .name = "snirm_53c710", .num_resources = ARRAY_SIZE(snirm_53c710_rsrc), .resource = snirm_53c710_rsrc }; static struct resource sc26xx_rsrc[] = { { .start = 0x1c070000, .end = 0x1c0700ff, .flags = IORESOURCE_MEM }, { .start = 20, .end = 20, .flags = IORESOURCE_IRQ } }; static struct platform_device sc26xx_pdev = { .name = "SC26xx", .num_resources = ARRAY_SIZE(sc26xx_rsrc), .resource = sc26xx_rsrc }; static u32 a20r_ack_hwint(void) { u32 status = read_c0_status(); write_c0_status (status | 0x00010000); asm volatile( " .set push \n" " .set noat \n" " .set noreorder \n" " lw $1, 0(%0) \n" " sb $0, 0(%1) \n" " sync \n" " lb %1, 0(%1) \n" " b 1f \n" " ori %1, $1, 2 \n" " .align 8 \n" "1: \n" " nop \n" " sw %1, 0(%0) \n" " sync \n" " li %1, 0x20 \n" "2: \n" " nop \n" " bnez %1,2b \n" " addiu %1, -1 \n" " sw $1, 0(%0) \n" " sync \n" ".set pop \n" : : "Jr" (PCIMT_UCONF), "Jr" (0xbc000000)); write_c0_status(status); return status; } static inline void unmask_a20r_irq(unsigned int irq) { set_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE)); irq_enable_hazard(); } static inline void mask_a20r_irq(unsigned int irq) { clear_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE)); irq_disable_hazard(); } static void end_a20r_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) { a20r_ack_hwint(); unmask_a20r_irq(irq); } } static struct irq_chip a20r_irq_type = { .typename = "A20R", .ack = mask_a20r_irq, .mask = mask_a20r_irq, .mask_ack = mask_a20r_irq, .unmask = unmask_a20r_irq, .end = end_a20r_irq, }; /* * hwint 0 receive all interrupts */ static void a20r_hwint(void) { u32 cause, status; int irq; clear_c0_status (IE_IRQ0); status = a20r_ack_hwint(); cause = read_c0_cause(); irq = ffs(((cause & status) >> 8) & 0xf8); if (likely(irq > 0)) do_IRQ(SNI_A20R_IRQ_BASE + irq - 1); set_c0_status(IE_IRQ0); } void __init sni_a20r_irq_init(void) { int i; for (i = SNI_A20R_IRQ_BASE + 2 ; i < SNI_A20R_IRQ_BASE + 8; i++) set_irq_chip(i, &a20r_irq_type); sni_hwint = a20r_hwint; change_c0_status(ST0_IM, IE_IRQ0); setup_irq (SNI_A20R_IRQ_BASE + 3, &sni_isa_irq); } void sni_a20r_init(void) { /* FIXME, remove if not needed */ } static int __init snirm_a20r_setup_devinit(void) { switch (sni_brd_type) { case SNI_BRD_TOWER_OASIC: case SNI_BRD_MINITOWER: platform_device_register(&snirm_82596_pdev); platform_device_register(&snirm_53c710_pdev); platform_device_register(&sc26xx_pdev); platform_device_register(&a20r_serial8250_device); platform_device_register(&a20r_ds1216_device); break; } return 0; } device_initcall(snirm_a20r_setup_devinit);