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/config.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/device.h>
  24 #include <linux/bitops.h>
  25 #include <linux/pci.h>
  26 #include <linux/ioport.h>
  27 #include <linux/slab.h>
  28 #include <linux/delay.h>
  29
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/page.h>
  34 #include <asm/system.h>
  35 #include <asm/hardware.h>
  36 #include <asm/mach-types.h>
  37
  38 #include <asm/mach/pci.h>
  39 #include <asm/mach/map.h>
  40 #include <asm/mach/irq.h>
  41 #include <asm/mach/time.h>
  42 #include <asm/mach/flash.h>
  43 #include <asm/mach/arch.h>
  44
  45 #include <asm/arch/gpio.h>
  46
  47
  48 /*************************************************************************
  49  * IXDP2x00 IRQ Initialization
  50  *************************************************************************/
  51 static volatile unsigned long *board_irq_mask;
  52 static volatile unsigned long *board_irq_stat;
  53 static unsigned long board_irq_count;
  54
  55 #ifdef CONFIG_ARCH_IXDP2400
  56 /*
  57  * Slowport configuration for accessing CPLD registers on IXDP2x00
  58  */
  59 static struct slowport_cfg slowport_cpld_cfg = {
  60         .CCR =  SLOWPORT_CCR_DIV_2,
  61         .WTC = 0x00000070,
  62         .RTC = 0x00000070,
  63         .PCR = SLOWPORT_MODE_FLASH,
  64         .ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8
  65 };
  66 #endif
  67
  68 static void ixdp2x00_irq_mask(unsigned int irq)
  69 {
  70         unsigned long dummy;
  71         static struct slowport_cfg old_cfg;
  72
  73         /*
  74          * This is ugly in common code but really don't know
  75          * of a better way to handle it. :(
  76          */
  77 #ifdef CONFIG_ARCH_IXDP2400
  78         if (machine_is_ixdp2400())
  79                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
  80 #endif
  81
  82         dummy = *board_irq_mask;
  83         dummy |=  IXP2000_BOARD_IRQ_MASK(irq);
  84         ixp2000_reg_write(board_irq_mask, dummy);
  85
  86 #ifdef CONFIG_ARCH_IXDP2400
  87         if (machine_is_ixdp2400())
  88                 ixp2000_release_slowport(&old_cfg);
  89 #endif
  90 }
  91
  92 static void ixdp2x00_irq_unmask(unsigned int irq)
  93 {
  94         unsigned long dummy;
  95         static struct slowport_cfg old_cfg;
  96
  97 #ifdef CONFIG_ARCH_IXDP2400
  98         if (machine_is_ixdp2400())
  99                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
 100 #endif
 101
 102         dummy = *board_irq_mask;
 103         dummy &=  ~IXP2000_BOARD_IRQ_MASK(irq);
 104         ixp2000_reg_write(board_irq_mask, dummy);
 105
 106         if (machine_is_ixdp2400())
 107                 ixp2000_release_slowport(&old_cfg);
 108 }
 109
 110 static void ixdp2x00_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 111 {
 112         volatile u32 ex_interrupt = 0;
 113         static struct slowport_cfg old_cfg;
 114         int i;
 115
 116         desc->chip->mask(irq);
 117
 118 #ifdef CONFIG_ARCH_IXDP2400
 119         if (machine_is_ixdp2400())
 120                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
 121 #endif
 122         ex_interrupt = *board_irq_stat & 0xff;
 123         if (machine_is_ixdp2400())
 124                 ixp2000_release_slowport(&old_cfg);
 125
 126         if(!ex_interrupt) {
 127                 printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n");
 128                 return;
 129         }
 130
 131         for(i = 0; i < board_irq_count; i++) {
 132                 if(ex_interrupt & (1 << i))  {
 133                         struct irqdesc *cpld_desc;
 134                         int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
 135                         cpld_desc = irq_desc + cpld_irq;
 136                         desc_handle_irq(cpld_irq, cpld_desc, regs);
 137                 }
 138         }
 139
 140         desc->chip->unmask(irq);
 141 }
 142
 143 static struct irqchip ixdp2x00_cpld_irq_chip = {
 144         .ack    = ixdp2x00_irq_mask,
 145         .mask   = ixdp2x00_irq_mask,
 146         .unmask = ixdp2x00_irq_unmask
 147 };
 148
 149 void ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_irqs)
 150 {
 151         unsigned int irq;
 152
 153         ixp2000_init_irq();
 154
 155         if (!ixdp2x00_master_npu())
 156                 return;
 157
 158         board_irq_stat = stat_reg;
 159         board_irq_mask = mask_reg;
 160         board_irq_count = nr_irqs;
 161
 162         *board_irq_mask = 0xffffffff;
 163
 164         for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
 165                 set_irq_chip(irq, &ixdp2x00_cpld_irq_chip);
 166                 set_irq_handler(irq, do_level_IRQ);
 167                 set_irq_flags(irq, IRQF_VALID);
 168         }
 169
 170         /* Hook into PCI interrupt */
 171         set_irq_chained_handler(IRQ_IXP2000_PCIB, &ixdp2x00_irq_handler);
 172 }
 173
 174 /*************************************************************************
 175  * IXDP2x00 memory map
 176  *************************************************************************/
 177 static struct map_desc ixdp2x00_io_desc __initdata = {
 178         .virtual        = IXDP2X00_VIRT_CPLD_BASE,
 179         .physical       = IXDP2X00_PHYS_CPLD_BASE,
 180         .length         = IXDP2X00_CPLD_SIZE,
 181         .type           = MT_DEVICE
 182 };
 183
 184 void __init ixdp2x00_map_io(void)
 185 {
 186         ixp2000_map_io();
 187
 188         iotable_init(&ixdp2x00_io_desc, 1);
 189 }
 190
 191 /*************************************************************************
 192  * IXDP2x00-common PCI init
 193  *
 194  * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board
 195  * contains two NPUs (ingress and egress) connected over PCI,  both running
 196  * instances  of the kernel. So far so good. Peers on the PCI bus running
 197  * Linux is a common design in telecom systems. The problem is that instead
 198  * of all the devices being controlled by a single host, different
 199  * devices are controlles by different NPUs on the same bus, leading to
 200  * multiple hosts on the bus. The exact bus layout looks like:
 201  *
 202  *                   Bus 0
 203  *    Master NPU <-------------------+-------------------> Slave NPU
 204  *                                   |
 205  *                                   |
 206  *                                  P2P
 207  *                                   |
 208  *
 209  *                  Bus 1            |
 210  *               <--+------+---------+---------+------+-->
 211  *                  |      |         |         |      |
 212  *                  |      |         |         |      |
 213  *             ... Dev    PMC       Media     Eth0   Eth1 ...
 214  *
 215  * The master controlls all but Eth1, which is controlled by the
 216  * slave. What this means is that the both the master and the slave
 217  * have to scan the bus, but only one of them can enumerate the bus.
 218  * In addition, after the bus is scanned, each kernel must remove
 219  * the device(s) it does not control from the PCI dev list otherwise
 220  * a driver on each NPU will try to manage it and we will have horrible
 221  * conflicts. Oh..and the slave NPU needs to see the master NPU
 222  * for Intel's drivers to work properly. Closed source drivers...
 223  *
 224  * The way we deal with this is fairly simple but ugly:
 225  *
 226  * 1) Let master scan and enumerate the bus completely.
 227  * 2) Master deletes Eth1 from device list.
 228  * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave)
 229  *    from device list.
 230  * 4) Find HW designers and LART them.
 231  *
 232  * The boards also do not do normal PCI IRQ routing, or any sort of
 233  * sensical  swizzling, so we just need to check where on the  bus a
 234  * device sits and figure out to which CPLD pin the interrupt is routed.
 235  * See ixdp2[48]00.c files.
 236  *
 237  *************************************************************************/
 238 void ixdp2x00_slave_pci_postinit(void)
 239 {
 240         struct pci_dev *dev;
 241
 242         /*
 243          * Remove PMC device is there is one
 244          */
 245         if((dev = pci_find_slot(1, IXDP2X00_PMC_DEVFN)))
 246                 pci_remove_bus_device(dev);
 247
 248         dev = pci_find_slot(0, IXDP2X00_21555_DEVFN);
 249         pci_remove_bus_device(dev);
 250 }
 251
 252 /**************************************************************************
 253  * IXDP2x00 Machine Setup
 254  *************************************************************************/
 255 static struct flash_platform_data ixdp2x00_platform_data = {
 256         .map_name       = "cfi_probe",
 257         .width          = 1,
 258 };
 259
 260 static struct ixp2000_flash_data ixdp2x00_flash_data = {
 261         .platform_data  = &ixdp2x00_platform_data,
 262         .nr_banks       = 1
 263 };
 264
 265 static struct resource ixdp2x00_flash_resource = {
 266         .start          = 0xc4000000,
 267         .end            = 0xc4000000 + 0x00ffffff,
 268         .flags          = IORESOURCE_MEM,
 269 };
 270
 271 static struct platform_device ixdp2x00_flash = {
 272         .name           = "IXP2000-Flash",
 273         .id             = 0,
 274         .dev            = {
 275                 .platform_data = &ixdp2x00_flash_data,
 276         },
 277         .num_resources  = 1,
 278         .resource       = &ixdp2x00_flash_resource,
 279 };
 280
 281 static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = {
 282         .sda_pin        = IXDP2X00_GPIO_SDA,
 283         .scl_pin        = IXDP2X00_GPIO_SCL,
 284 };
 285
 286 static struct platform_device ixdp2x00_i2c_controller = {
 287         .name           = "IXP2000-I2C",
 288         .id             = 0,
 289         .dev            = {
 290                 .platform_data = &ixdp2x00_i2c_gpio_pins,
 291         },
 292         .num_resources  = 0
 293 };
 294
 295 static struct platform_device *ixdp2x00_devices[] __initdata = {
 296         &ixdp2x00_flash,
 297         &ixdp2x00_i2c_controller
 298 };
 299
 300 void __init ixdp2x00_init_machine(void)
 301 {
 302         gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1);
 303         gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT);
 304
 305         platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices));
 306         ixp2000_uart_init();
 307 }
 308