/* * arch/arm/mach-ixp2000/ixdp2x00.c * * Code common to IXDP2400 and IXDP2800 platforms. * * Original Author: Naeem Afzal <naeem.m.afzal@intel.com> * Maintainer: Deepak Saxena <dsaxena@plexity.net> * * Copyright (C) 2002 Intel Corp. * Copyright (C) 2003-2004 MontaVista Software, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/bitops.h> #include <linux/pci.h> #include <linux/ioport.h> #include <linux/slab.h> #include <linux/delay.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/pgtable.h> #include <asm/page.h> #include <asm/system.h> #include <asm/arch/hardware.h> #include <asm/mach-types.h> #include <asm/mach/pci.h> #include <asm/mach/map.h> #include <asm/mach/irq.h> #include <asm/mach/time.h> #include <asm/mach/flash.h> #include <asm/mach/arch.h> #include <asm/arch/gpio.h> /************************************************************************* * IXDP2x00 IRQ Initialization *************************************************************************/ static volatile unsigned long *board_irq_mask; static volatile unsigned long *board_irq_stat; static unsigned long board_irq_count; #ifdef CONFIG_ARCH_IXDP2400 /* * Slowport configuration for accessing CPLD registers on IXDP2x00 */ static struct slowport_cfg slowport_cpld_cfg = { .CCR = SLOWPORT_CCR_DIV_2, .WTC = 0x00000070, .RTC = 0x00000070, .PCR = SLOWPORT_MODE_FLASH, .ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8 }; #endif static void ixdp2x00_irq_mask(unsigned int irq) { unsigned long dummy; static struct slowport_cfg old_cfg; /* * This is ugly in common code but really don't know * of a better way to handle it. :( */ #ifdef CONFIG_ARCH_IXDP2400 if (machine_is_ixdp2400()) ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg); #endif dummy = *board_irq_mask; dummy |= IXP2000_BOARD_IRQ_MASK(irq); ixp2000_reg_wrb(board_irq_mask, dummy); #ifdef CONFIG_ARCH_IXDP2400 if (machine_is_ixdp2400()) ixp2000_release_slowport(&old_cfg); #endif } static void ixdp2x00_irq_unmask(unsigned int irq) { unsigned long dummy; static struct slowport_cfg old_cfg; #ifdef CONFIG_ARCH_IXDP2400 if (machine_is_ixdp2400()) ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg); #endif dummy = *board_irq_mask; dummy &= ~IXP2000_BOARD_IRQ_MASK(irq); ixp2000_reg_wrb(board_irq_mask, dummy); if (machine_is_ixdp2400()) ixp2000_release_slowport(&old_cfg); } static void ixdp2x00_irq_handler(unsigned int irq, struct irq_desc *desc) { volatile u32 ex_interrupt = 0; static struct slowport_cfg old_cfg; int i; desc->chip->mask(irq); #ifdef CONFIG_ARCH_IXDP2400 if (machine_is_ixdp2400()) ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg); #endif ex_interrupt = *board_irq_stat & 0xff; if (machine_is_ixdp2400()) ixp2000_release_slowport(&old_cfg); if(!ex_interrupt) { printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n"); return; } for(i = 0; i < board_irq_count; i++) { if(ex_interrupt & (1 << i)) { struct irq_desc *cpld_desc; int cpld_irq = IXP2000_BOARD_IRQ(0) + i; cpld_desc = irq_desc + cpld_irq; desc_handle_irq(cpld_irq, cpld_desc); } } desc->chip->unmask(irq); } static struct irq_chip ixdp2x00_cpld_irq_chip = { .ack = ixdp2x00_irq_mask, .mask = ixdp2x00_irq_mask, .unmask = ixdp2x00_irq_unmask }; void __init ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_irqs) { unsigned int irq; ixp2000_init_irq(); if (!ixdp2x00_master_npu()) return; board_irq_stat = stat_reg; board_irq_mask = mask_reg; board_irq_count = nr_irqs; *board_irq_mask = 0xffffffff; for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) { set_irq_chip(irq, &ixdp2x00_cpld_irq_chip); set_irq_handler(irq, handle_level_irq); set_irq_flags(irq, IRQF_VALID); } /* Hook into PCI interrupt */ set_irq_chained_handler(IRQ_IXP2000_PCIB, ixdp2x00_irq_handler); } /************************************************************************* * IXDP2x00 memory map *************************************************************************/ static struct map_desc ixdp2x00_io_desc __initdata = { .virtual = IXDP2X00_VIRT_CPLD_BASE, .pfn = __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE), .length = IXDP2X00_CPLD_SIZE, .type = MT_DEVICE }; void __init ixdp2x00_map_io(void) { ixp2000_map_io(); iotable_init(&ixdp2x00_io_desc, 1); } /************************************************************************* * IXDP2x00-common PCI init * * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board * contains two NPUs (ingress and egress) connected over PCI, both running * instances of the kernel. So far so good. Peers on the PCI bus running * Linux is a common design in telecom systems. The problem is that instead * of all the devices being controlled by a single host, different * devices are controlled by different NPUs on the same bus, leading to * multiple hosts on the bus. The exact bus layout looks like: * * Bus 0 * Master NPU <-------------------+-------------------> Slave NPU * | * | * P2P * | * * Bus 1 | * <--+------+---------+---------+------+--> * | | | | | * | | | | | * ... Dev PMC Media Eth0 Eth1 ... * * The master controls all but Eth1, which is controlled by the * slave. What this means is that the both the master and the slave * have to scan the bus, but only one of them can enumerate the bus. * In addition, after the bus is scanned, each kernel must remove * the device(s) it does not control from the PCI dev list otherwise * a driver on each NPU will try to manage it and we will have horrible * conflicts. Oh..and the slave NPU needs to see the master NPU * for Intel's drivers to work properly. Closed source drivers... * * The way we deal with this is fairly simple but ugly: * * 1) Let master scan and enumerate the bus completely. * 2) Master deletes Eth1 from device list. * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave) * from device list. * 4) Find HW designers and LART them. * * The boards also do not do normal PCI IRQ routing, or any sort of * sensical swizzling, so we just need to check where on the bus a * device sits and figure out to which CPLD pin the interrupt is routed. * See ixdp2[48]00.c files. * *************************************************************************/ void ixdp2x00_slave_pci_postinit(void) { struct pci_dev *dev; /* * Remove PMC device is there is one */ if((dev = pci_get_bus_and_slot(1, IXDP2X00_PMC_DEVFN))) { pci_remove_bus_device(dev); pci_dev_put(dev); } dev = pci_get_bus_and_slot(0, IXDP2X00_21555_DEVFN); pci_remove_bus_device(dev); pci_dev_put(dev); } /************************************************************************** * IXDP2x00 Machine Setup *************************************************************************/ static struct flash_platform_data ixdp2x00_platform_data = { .map_name = "cfi_probe", .width = 1, }; static struct ixp2000_flash_data ixdp2x00_flash_data = { .platform_data = &ixdp2x00_platform_data, .nr_banks = 1 }; static struct resource ixdp2x00_flash_resource = { .start = 0xc4000000, .end = 0xc4000000 + 0x00ffffff, .flags = IORESOURCE_MEM, }; static struct platform_device ixdp2x00_flash = { .name = "IXP2000-Flash", .id = 0, .dev = { .platform_data = &ixdp2x00_flash_data, }, .num_resources = 1, .resource = &ixdp2x00_flash_resource, }; static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = { .sda_pin = IXDP2X00_GPIO_SDA, .scl_pin = IXDP2X00_GPIO_SCL, }; static struct platform_device ixdp2x00_i2c_controller = { .name = "IXP2000-I2C", .id = 0, .dev = { .platform_data = &ixdp2x00_i2c_gpio_pins, }, .num_resources = 0 }; static struct platform_device *ixdp2x00_devices[] __initdata = { &ixdp2x00_flash, &ixdp2x00_i2c_controller }; void __init ixdp2x00_init_machine(void) { gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1); gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT); platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices)); ixp2000_uart_init(); }