arch/powerpc/platforms/embedded6xx/linkstation.c

   1 /*
   2  * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
   3  *
   4  * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
   5  *
   6  * Based on sandpoint.c by Mark A. Greer
   7  *
   8  * This file is licensed under the terms of the GNU General Public License
   9  * version 2.  This program is licensed "as is" without any warranty of
  10  * any kind, whether express or implied.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/initrd.h>
  15 #include <linux/of_platform.h>
  16
  17 #include <asm/time.h>
  18 #include <asm/prom.h>
  19 #include <asm/mpic.h>
  20 #include <asm/pci-bridge.h>
  21
  22 #include "mpc10x.h"
  23
  24 static __initdata struct of_device_id of_bus_ids[] = {
  25         { .type = "soc", },
  26         { .compatible = "simple-bus", },
  27         {},
  28 };
  29
  30 static int __init declare_of_platform_devices(void)
  31 {
  32         of_platform_bus_probe(NULL, of_bus_ids, NULL);
  33         return 0;
  34 }
  35 machine_device_initcall(linkstation, declare_of_platform_devices);
  36
  37 static int __init linkstation_add_bridge(struct device_node *dev)
  38 {
  39 #ifdef CONFIG_PCI
  40         int len;
  41         struct pci_controller *hose;
  42         const int *bus_range;
  43
  44         printk("Adding PCI host bridge %s\n", dev->full_name);
  45
  46         bus_range = of_get_property(dev, "bus-range", &len);
  47         if (bus_range == NULL || len < 2 * sizeof(int))
  48                 printk(KERN_WARNING "Can't get bus-range for %s, assume"
  49                                 " bus 0\n", dev->full_name);
  50
  51         hose = pcibios_alloc_controller(dev);
  52         if (hose == NULL)
  53                 return -ENOMEM;
  54         hose->first_busno = bus_range ? bus_range[0] : 0;
  55         hose->last_busno = bus_range ? bus_range[1] : 0xff;
  56         setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
  57
  58         /* Interpret the "ranges" property */
  59         /* This also maps the I/O region and sets isa_io/mem_base */
  60         pci_process_bridge_OF_ranges(hose, dev, 1);
  61 #endif
  62         return 0;
  63 }
  64
  65 static void __init linkstation_setup_arch(void)
  66 {
  67         struct device_node *np;
  68
  69         /* Lookup PCI host bridges */
  70         for_each_compatible_node(np, "pci", "mpc10x-pci")
  71                 linkstation_add_bridge(np);
  72
  73         printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
  74         printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
  75 }
  76
  77 /*
  78  * Interrupt setup and service.  Interrupts on the linkstation come
  79  * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
  80  */
  81 static void __init linkstation_init_IRQ(void)
  82 {
  83         struct mpic *mpic;
  84         struct device_node *dnp;
  85         const u32 *prop;
  86         int size;
  87         phys_addr_t paddr;
  88
  89         dnp = of_find_node_by_type(NULL, "open-pic");
  90         if (dnp == NULL)
  91                 return;
  92
  93         prop = of_get_property(dnp, "reg", &size);
  94         paddr = (phys_addr_t)of_translate_address(dnp, prop);
  95
  96         mpic = mpic_alloc(dnp, paddr, MPIC_PRIMARY | MPIC_WANTS_RESET, 4, 32, " EPIC     ");
  97         BUG_ON(mpic == NULL);
  98
  99         /* PCI IRQs */
 100         mpic_assign_isu(mpic, 0, paddr + 0x10200);
 101
 102         /* I2C */
 103         mpic_assign_isu(mpic, 1, paddr + 0x11000);
 104
 105         /* ttyS0, ttyS1 */
 106         mpic_assign_isu(mpic, 2, paddr + 0x11100);
 107
 108         mpic_init(mpic);
 109 }
 110
 111 extern void avr_uart_configure(void);
 112 extern void avr_uart_send(const char);
 113
 114 static void linkstation_restart(char *cmd)
 115 {
 116         local_irq_disable();
 117
 118         /* Reset system via AVR */
 119         avr_uart_configure();
 120         /* Send reboot command */
 121         avr_uart_send('C');
 122
 123         for(;;)  /* Spin until reset happens */
 124                 avr_uart_send('G');     /* "kick" */
 125 }
 126
 127 static void linkstation_power_off(void)
 128 {
 129         local_irq_disable();
 130
 131         /* Power down system via AVR */
 132         avr_uart_configure();
 133         /* send shutdown command */
 134         avr_uart_send('E');
 135
 136         for(;;)  /* Spin until power-off happens */
 137                 avr_uart_send('G');     /* "kick" */
 138         /* NOTREACHED */
 139 }
 140
 141 static void linkstation_halt(void)
 142 {
 143         linkstation_power_off();
 144         /* NOTREACHED */
 145 }
 146
 147 static void linkstation_show_cpuinfo(struct seq_file *m)
 148 {
 149         seq_printf(m, "vendor\t\t: Buffalo Technology\n");
 150         seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
 151 }
 152
 153 static int __init linkstation_probe(void)
 154 {
 155         unsigned long root;
 156
 157         root = of_get_flat_dt_root();
 158
 159         if (!of_flat_dt_is_compatible(root, "linkstation"))
 160                 return 0;
 161         return 1;
 162 }
 163
 164 define_machine(linkstation){
 165         .name                   = "Buffalo Linkstation",
 166         .probe                  = linkstation_probe,
 167         .setup_arch             = linkstation_setup_arch,
 168         .init_IRQ               = linkstation_init_IRQ,
 169         .show_cpuinfo           = linkstation_show_cpuinfo,
 170         .get_irq                = mpic_get_irq,
 171         .restart                = linkstation_restart,
 172         .power_off              = linkstation_power_off,
 173         .halt                   = linkstation_halt,
 174         .calibrate_decr         = generic_calibrate_decr,
 175 };