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/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/bitops.h>
  24 #include <linux/pci.h>
  25 #include <linux/ioport.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/page.h>
  33 #include <asm/system.h>
  34 #include <asm/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 <asm/arch/gpio.h>
  45
  46
  47 /*************************************************************************
  48  * IXDP2x00 IRQ Initialization
  49  *************************************************************************/
  50 static volatile unsigned long *board_irq_mask;
  51 static volatile unsigned long *board_irq_stat;
  52 static unsigned long board_irq_count;
  53
  54 #ifdef CONFIG_ARCH_IXDP2400
  55 /*
  56  * Slowport configuration for accessing CPLD registers on IXDP2x00
  57  */
  58 static struct slowport_cfg slowport_cpld_cfg = {
  59         .CCR =  SLOWPORT_CCR_DIV_2,
  60         .WTC = 0x00000070,
  61         .RTC = 0x00000070,
  62         .PCR = SLOWPORT_MODE_FLASH,
  63         .ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8
  64 };
  65 #endif
  66
  67 static void ixdp2x00_irq_mask(unsigned int irq)
  68 {
  69         unsigned long dummy;
  70         static struct slowport_cfg old_cfg;
  71
  72         /*
  73          * This is ugly in common code but really don't know
  74          * of a better way to handle it. :(
  75          */
  76 #ifdef CONFIG_ARCH_IXDP2400
  77         if (machine_is_ixdp2400())
  78                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
  79 #endif
  80
  81         dummy = *board_irq_mask;
  82         dummy |=  IXP2000_BOARD_IRQ_MASK(irq);
  83         ixp2000_reg_wrb(board_irq_mask, dummy);
  84
  85 #ifdef CONFIG_ARCH_IXDP2400
  86         if (machine_is_ixdp2400())
  87                 ixp2000_release_slowport(&old_cfg);
  88 #endif
  89 }
  90
  91 static void ixdp2x00_irq_unmask(unsigned int irq)
  92 {
  93         unsigned long dummy;
  94         static struct slowport_cfg old_cfg;
  95
  96 #ifdef CONFIG_ARCH_IXDP2400
  97         if (machine_is_ixdp2400())
  98                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
  99 #endif
 100
 101         dummy = *board_irq_mask;
 102         dummy &=  ~IXP2000_BOARD_IRQ_MASK(irq);
 103         ixp2000_reg_wrb(board_irq_mask, dummy);
 104
 105         if (machine_is_ixdp2400())
 106                 ixp2000_release_slowport(&old_cfg);
 107 }
 108
 109 static void ixdp2x00_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 110 {
 111         volatile u32 ex_interrupt = 0;
 112         static struct slowport_cfg old_cfg;
 113         int i;
 114
 115         desc->chip->mask(irq);
 116
 117 #ifdef CONFIG_ARCH_IXDP2400
 118         if (machine_is_ixdp2400())
 119                 ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
 120 #endif
 121         ex_interrupt = *board_irq_stat & 0xff;
 122         if (machine_is_ixdp2400())
 123                 ixp2000_release_slowport(&old_cfg);
 124
 125         if(!ex_interrupt) {
 126                 printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n");
 127                 return;
 128         }
 129
 130         for(i = 0; i < board_irq_count; i++) {
 131                 if(ex_interrupt & (1 << i))  {
 132                         struct irqdesc *cpld_desc;
 133                         int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
 134                         cpld_desc = irq_desc + cpld_irq;
 135                         desc_handle_irq(cpld_irq, cpld_desc, regs);
 136                 }
 137         }
 138
 139         desc->chip->unmask(irq);
 140 }
 141
 142 static struct irqchip ixdp2x00_cpld_irq_chip = {
 143         .ack    = ixdp2x00_irq_mask,
 144         .mask   = ixdp2x00_irq_mask,
 145         .unmask = ixdp2x00_irq_unmask
 146 };
 147
 148 void ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_irqs)
 149 {
 150         unsigned int irq;
 151
 152         ixp2000_init_irq();
 153
 154         if (!ixdp2x00_master_npu())
 155                 return;
 156
 157         board_irq_stat = stat_reg;
 158         board_irq_mask = mask_reg;
 159         board_irq_count = nr_irqs;
 160
 161         *board_irq_mask = 0xffffffff;
 162
 163         for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
 164                 set_irq_chip(irq, &ixdp2x00_cpld_irq_chip);
 165                 set_irq_handler(irq, do_level_IRQ);
 166                 set_irq_flags(irq, IRQF_VALID);
 167         }
 168
 169         /* Hook into PCI interrupt */
 170         set_irq_chained_handler(IRQ_IXP2000_PCIB, ixdp2x00_irq_handler);
 171 }
 172
 173 /*************************************************************************
 174  * IXDP2x00 memory map
 175  *************************************************************************/
 176 static struct map_desc ixdp2x00_io_desc __initdata = {
 177         .virtual        = IXDP2X00_VIRT_CPLD_BASE,
 178         .pfn            = __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE),
 179         .length         = IXDP2X00_CPLD_SIZE,
 180         .type           = MT_DEVICE
 181 };
 182
 183 void __init ixdp2x00_map_io(void)
 184 {
 185         ixp2000_map_io();
 186
 187         iotable_init(&ixdp2x00_io_desc, 1);
 188 }
 189
 190 /*************************************************************************
 191  * IXDP2x00-common PCI init
 192  *
 193  * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board
 194  * contains two NPUs (ingress and egress) connected over PCI,  both running
 195  * instances  of the kernel. So far so good. Peers on the PCI bus running
 196  * Linux is a common design in telecom systems. The problem is that instead
 197  * of all the devices being controlled by a single host, different
 198  * devices are controlles by different NPUs on the same bus, leading to
 199  * multiple hosts on the bus. The exact bus layout looks like:
 200  *
 201  *                   Bus 0
 202  *    Master NPU <-------------------+-------------------> Slave NPU
 203  *                                   |
 204  *                                   |
 205  *                                  P2P
 206  *                                   |
 207  *
 208  *                  Bus 1            |
 209  *               <--+------+---------+---------+------+-->
 210  *                  |      |         |         |      |
 211  *                  |      |         |         |      |
 212  *             ... Dev    PMC       Media     Eth0   Eth1 ...
 213  *
 214  * The master controlls all but Eth1, which is controlled by the
 215  * slave. What this means is that the both the master and the slave
 216  * have to scan the bus, but only one of them can enumerate the bus.
 217  * In addition, after the bus is scanned, each kernel must remove
 218  * the device(s) it does not control from the PCI dev list otherwise
 219  * a driver on each NPU will try to manage it and we will have horrible
 220  * conflicts. Oh..and the slave NPU needs to see the master NPU
 221  * for Intel's drivers to work properly. Closed source drivers...
 222  *
 223  * The way we deal with this is fairly simple but ugly:
 224  *
 225  * 1) Let master scan and enumerate the bus completely.
 226  * 2) Master deletes Eth1 from device list.
 227  * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave)
 228  *    from device list.
 229  * 4) Find HW designers and LART them.
 230  *
 231  * The boards also do not do normal PCI IRQ routing, or any sort of
 232  * sensical  swizzling, so we just need to check where on the  bus a
 233  * device sits and figure out to which CPLD pin the interrupt is routed.
 234  * See ixdp2[48]00.c files.
 235  *
 236  *************************************************************************/
 237 void ixdp2x00_slave_pci_postinit(void)
 238 {
 239         struct pci_dev *dev;
 240
 241         /*
 242          * Remove PMC device is there is one
 243          */
 244         if((dev = pci_find_slot(1, IXDP2X00_PMC_DEVFN)))
 245                 pci_remove_bus_device(dev);
 246
 247         dev = pci_find_slot(0, IXDP2X00_21555_DEVFN);
 248         pci_remove_bus_device(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