/*
* 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/gpio.h>
#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/delay.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <mach/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 <mach/gpio-ixp2000.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(struct irq_data *d)
{
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(d->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(struct irq_data *d)
{
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(d->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->irq_data.chip->irq_mask(&desc->irq_data);
#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)) {
int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
generic_handle_irq(cpld_irq);
}
}
desc->irq_data.chip->irq_unmask(&desc->irq_data);
}
static struct irq_chip ixdp2x00_cpld_irq_chip = {
.irq_ack = ixdp2x00_irq_mask,
.irq_mask = ixdp2x00_irq_mask,
.irq_unmask = ixdp2x00_irq_unmask
};
void __init ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_of_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_of_irqs;
*board_irq_mask = 0xffffffff;
for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
irq_set_chip_and_handler(irq, &ixdp2x00_cpld_irq_chip,
handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
/* Hook into PCI interrupt */
irq_set_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();
}
