arch/arm/mach-ixp2000/ixdp2x00.c

   1 /*
   2  * arch/arm/mach-ixp2000/ixdp2x00.c
   3  *
   4  * Code common to IXDP2400 and IXDP2800 platforms.
   5  *
   6  * Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
   7  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
   8  *
   9  * Copyright (C) 2002 Intel Corp.
  10  * Copyright (C) 2003-2004 MontaVista Software, Inc.
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  */
  17 #include <linux/gpio.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/sched.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/bitops.h>
  25 #include <linux/pci.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/io.h>
  29
  30 #include <asm/irq.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/page.h>
  33 #include <asm/system.h>
  34 #include <mach/hardware.h>
  35 #include <asm/mach-types.h>
  36
  37 #include <asm/mach/pci.h>
  38 #include <asm/mach/map.h>
  39 #include <asm/mach/irq.h>
  40 #include <asm/mach/time.h>
  41 #include <asm/mach/flash.h>
  42 #include <asm/mach/arch.h>
  43
  44 #include <mach/gpio-ixp2000.h>
  45
  46 /*************************************************************************
  47  * IXDP2x00 IRQ Initialization
  48  *************************************************************************/
  49 static volatile unsigned long *board_irq_mask;
  50 static volatile unsigned long *board_irq_stat;
  51 static unsigned long board_irq_count;
  52
  53 #ifdef CONFIG_ARCH_IXDP2400
  54 /*
  55  * Slowport configuration for accessing CPLD registers on IXDP2x00
  56  */
  57 static struct slowport_cfg slowport_cpld_cfg = {
  58         .CCR =  SLOWPORT_CCR_DIV_2,
  59         .WTC = 0x00000070,
  60         .RTC = 0x00000070,
  61         .PCR = SLOWPORT_MODE_FLASH,
  62         .ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8
  63 };
  64 #endif
  65
  66 static void ixdp2x00_irq_mask(struct irq_data *d)
  67 {
  68         unsigned long dummy;
  69         static struct slowport_cfg old_cfg;
  70
  71         /*
  72          * This is ugly in common code but really don't know
  73          * of a better way to handle it. :(
  74          */
  75 #ifdef CONFIG_ARCH_IXDP2400
  76         if (machine_is_ixdp2400())
  77                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
  78 #endif
  79
  80         dummy = *board_irq_mask;
  81         dummy |=  IXP2000_BOARD_IRQ_MASK(d->irq);
  82         ixp2000_reg_wrb(board_irq_mask, dummy);
  83
  84 #ifdef CONFIG_ARCH_IXDP2400
  85         if (machine_is_ixdp2400())
  86                 ixp2000_release_slowport(&old_cfg);
  87 #endif
  88 }
  89
  90 static void ixdp2x00_irq_unmask(struct irq_data *d)
  91 {
  92         unsigned long dummy;
  93         static struct slowport_cfg old_cfg;
  94
  95 #ifdef CONFIG_ARCH_IXDP2400
  96         if (machine_is_ixdp2400())
  97                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
  98 #endif
  99
 100         dummy = *board_irq_mask;
 101         dummy &=  ~IXP2000_BOARD_IRQ_MASK(d->irq);
 102         ixp2000_reg_wrb(board_irq_mask, dummy);
 103
 104         if (machine_is_ixdp2400())
 105                 ixp2000_release_slowport(&old_cfg);
 106 }
 107
 108 static void ixdp2x00_irq_handler(unsigned int irq, struct irq_desc *desc)
 109 {
 110         volatile u32 ex_interrupt = 0;
 111         static struct slowport_cfg old_cfg;
 112         int i;
 113
 114         desc->irq_data.chip->irq_mask(&desc->irq_data);
 115
 116 #ifdef CONFIG_ARCH_IXDP2400
 117         if (machine_is_ixdp2400())
 118                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
 119 #endif
 120         ex_interrupt = *board_irq_stat & 0xff;
 121         if (machine_is_ixdp2400())
 122                 ixp2000_release_slowport(&old_cfg);
 123
 124         if(!ex_interrupt) {
 125                 printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n");
 126                 return;
 127         }
 128
 129         for(i = 0; i < board_irq_count; i++) {
 130                 if(ex_interrupt & (1 << i))  {
 131                         int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
 132                         generic_handle_irq(cpld_irq);
 133                 }
 134         }
 135
 136         desc->irq_data.chip->irq_unmask(&desc->irq_data);
 137 }
 138
 139 static struct irq_chip ixdp2x00_cpld_irq_chip = {
 140         .irq_ack        = ixdp2x00_irq_mask,
 141         .irq_mask       = ixdp2x00_irq_mask,
 142         .irq_unmask     = ixdp2x00_irq_unmask
 143 };
 144
 145 void __init ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_of_irqs)
 146 {
 147         unsigned int irq;
 148
 149         ixp2000_init_irq();
 150
 151         if (!ixdp2x00_master_npu())
 152                 return;
 153
 154         board_irq_stat = stat_reg;
 155         board_irq_mask = mask_reg;
 156         board_irq_count = nr_of_irqs;
 157
 158         *board_irq_mask = 0xffffffff;
 159
 160         for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
 161                 irq_set_chip_and_handler(irq, &ixdp2x00_cpld_irq_chip,
 162                                          handle_level_irq);
 163                 set_irq_flags(irq, IRQF_VALID);
 164         }
 165
 166         /* Hook into PCI interrupt */
 167         irq_set_chained_handler(IRQ_IXP2000_PCIB, ixdp2x00_irq_handler);
 168 }
 169
 170 /*************************************************************************
 171  * IXDP2x00 memory map
 172  *************************************************************************/
 173 static struct map_desc ixdp2x00_io_desc __initdata = {
 174         .virtual        = IXDP2X00_VIRT_CPLD_BASE,
 175         .pfn            = __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE),
 176         .length         = IXDP2X00_CPLD_SIZE,
 177         .type           = MT_DEVICE
 178 };
 179
 180 void __init ixdp2x00_map_io(void)
 181 {
 182         ixp2000_map_io();
 183
 184         iotable_init(&ixdp2x00_io_desc, 1);
 185 }
 186
 187 /*************************************************************************
 188  * IXDP2x00-common PCI init
 189  *
 190  * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board
 191  * contains two NPUs (ingress and egress) connected over PCI,  both running
 192  * instances  of the kernel. So far so good. Peers on the PCI bus running
 193  * Linux is a common design in telecom systems. The problem is that instead
 194  * of all the devices being controlled by a single host, different
 195  * devices are controlled by different NPUs on the same bus, leading to
 196  * multiple hosts on the bus. The exact bus layout looks like:
 197  *
 198  *                   Bus 0
 199  *    Master NPU <-------------------+-------------------> Slave NPU
 200  *                                   |
 201  *                                   |
 202  *                                  P2P
 203  *                                   |
 204  *
 205  *                  Bus 1            |
 206  *               <--+------+---------+---------+------+-->
 207  *                  |      |         |         |      |
 208  *                  |      |         |         |      |
 209  *             ... Dev    PMC       Media     Eth0   Eth1 ...
 210  *
 211  * The master controls all but Eth1, which is controlled by the
 212  * slave. What this means is that the both the master and the slave
 213  * have to scan the bus, but only one of them can enumerate the bus.
 214  * In addition, after the bus is scanned, each kernel must remove
 215  * the device(s) it does not control from the PCI dev list otherwise
 216  * a driver on each NPU will try to manage it and we will have horrible
 217  * conflicts. Oh..and the slave NPU needs to see the master NPU
 218  * for Intel's drivers to work properly. Closed source drivers...
 219  *
 220  * The way we deal with this is fairly simple but ugly:
 221  *
 222  * 1) Let master scan and enumerate the bus completely.
 223  * 2) Master deletes Eth1 from device list.
 224  * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave)
 225  *    from device list.
 226  * 4) Find HW designers and LART them.
 227  *
 228  * The boards also do not do normal PCI IRQ routing, or any sort of
 229  * sensical  swizzling, so we just need to check where on the  bus a
 230  * device sits and figure out to which CPLD pin the interrupt is routed.
 231  * See ixdp2[48]00.c files.
 232  *
 233  *************************************************************************/
 234 void ixdp2x00_slave_pci_postinit(void)
 235 {
 236         struct pci_dev *dev;
 237
 238         /*
 239          * Remove PMC device is there is one
 240          */
 241         if((dev = pci_get_bus_and_slot(1, IXDP2X00_PMC_DEVFN))) {
 242                 pci_remove_bus_device(dev);
 243                 pci_dev_put(dev);
 244         }
 245
 246         dev = pci_get_bus_and_slot(0, IXDP2X00_21555_DEVFN);
 247         pci_remove_bus_device(dev);
 248         pci_dev_put(dev);
 249 }
 250
 251 /**************************************************************************
 252  * IXDP2x00 Machine Setup
 253  *************************************************************************/
 254 static struct flash_platform_data ixdp2x00_platform_data = {
 255         .map_name       = "cfi_probe",
 256         .width          = 1,
 257 };
 258
 259 static struct ixp2000_flash_data ixdp2x00_flash_data = {
 260         .platform_data  = &ixdp2x00_platform_data,
 261         .nr_banks       = 1
 262 };
 263
 264 static struct resource ixdp2x00_flash_resource = {
 265         .start          = 0xc4000000,
 266         .end            = 0xc4000000 + 0x00ffffff,
 267         .flags          = IORESOURCE_MEM,
 268 };
 269
 270 static struct platform_device ixdp2x00_flash = {
 271         .name           = "IXP2000-Flash",
 272         .id             = 0,
 273         .dev            = {
 274                 .platform_data = &ixdp2x00_flash_data,
 275         },
 276         .num_resources  = 1,
 277         .resource       = &ixdp2x00_flash_resource,
 278 };
 279
 280 static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = {
 281         .sda_pin        = IXDP2X00_GPIO_SDA,
 282         .scl_pin        = IXDP2X00_GPIO_SCL,
 283 };
 284
 285 static struct platform_device ixdp2x00_i2c_controller = {
 286         .name           = "IXP2000-I2C",
 287         .id             = 0,
 288         .dev            = {
 289                 .platform_data = &ixdp2x00_i2c_gpio_pins,
 290         },
 291         .num_resources  = 0
 292 };
 293
 294 static struct platform_device *ixdp2x00_devices[] __initdata = {
 295         &ixdp2x00_flash,
 296         &ixdp2x00_i2c_controller
 297 };
 298
 299 void __init ixdp2x00_init_machine(void)
 300 {
 301         gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1);
 302         gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT);
 303
 304         platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices));
 305         ixp2000_uart_init();
 306 }
 307