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