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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-ixp2000/ixdp2x00.c
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/mach-ixp2000/ixdp2x00.c')
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diff --git a/arch/arm/mach-ixp2000/ixdp2x00.c b/arch/arm/mach-ixp2000/ixdp2x00.c
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+/*
+ * 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));
+}
+