arch/arm/mach-ixp2000/ixdp2x00.c - third_party/linux - Git at Google

 /*
  * 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/config.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/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>

 /*************************************************************************
  * 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_write(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_write(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;
 			cpld_desc->handle(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,
 	.physical	= 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));
 }
	/*
	* 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/config.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/mm.h>
	#include <linux/sched.h>
	#include <linux/interrupt.h>
	#include <linux/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>

	/*************************************************************************
	* 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_write(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_write(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;
	cpld_desc->handle(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,
	.physical = 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));
	}