| /* |
| * 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/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 irqdesc *desc, struct pt_regs *regs) |
| { |
| 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 irqdesc *cpld_desc; |
| int cpld_irq = IXP2000_BOARD_IRQ(0) + i; |
| cpld_desc = irq_desc + cpld_irq; |
| desc_handle_irq(cpld_irq, cpld_desc, regs); |
| } |
| } |
| |
| desc->chip->unmask(irq); |
| } |
| |
| static struct irqchip ixdp2x00_cpld_irq_chip = { |
| .ack = ixdp2x00_irq_mask, |
| .mask = ixdp2x00_irq_mask, |
| .unmask = ixdp2x00_irq_unmask |
| }; |
| |
| void 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, do_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 controlles 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 controlls 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_find_slot(1, IXDP2X00_PMC_DEVFN))) |
| pci_remove_bus_device(dev); |
| |
| dev = pci_find_slot(0, IXDP2X00_21555_DEVFN); |
| pci_remove_bus_device(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(); |
| } |
| |