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/mpic.h>
  19 #include <asm/pci-bridge.h>
  20
  21 #include "mpc10x.h"
  22
  23 static const struct of_device_id of_bus_ids[] __initconst = {
  24         { .type = "soc", },
  25         { .compatible = "simple-bus", },
  26         {},
  27 };
  28
  29 static int __init declare_of_platform_devices(void)
  30 {
  31         of_platform_bus_probe(NULL, of_bus_ids, NULL);
  32         return 0;
  33 }
  34 machine_device_initcall(linkstation, declare_of_platform_devices);
  35
  36 static int __init linkstation_add_bridge(struct device_node *dev)
  37 {
  38 #ifdef CONFIG_PCI
  39         int len;
  40         struct pci_controller *hose;
  41         const int *bus_range;
  42
  43         printk("Adding PCI host bridge %pOF\n", dev);
  44
  45         bus_range = of_get_property(dev, "bus-range", &len);
  46         if (bus_range == NULL || len < 2 * sizeof(int))
  47                 printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
  48                                 " bus 0\n", dev);
  49
  50         hose = pcibios_alloc_controller(dev);
  51         if (hose == NULL)
  52                 return -ENOMEM;
  53         hose->first_busno = bus_range ? bus_range[0] : 0;
  54         hose->last_busno = bus_range ? bus_range[1] : 0xff;
  55         setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
  56
  57         /* Interpret the "ranges" property */
  58         /* This also maps the I/O region and sets isa_io/mem_base */
  59         pci_process_bridge_OF_ranges(hose, dev, 1);
  60 #endif
  61         return 0;
  62 }
  63
  64 static void __init linkstation_setup_arch(void)
  65 {
  66         printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
  67         printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
  68 }
  69
  70 static void __init linkstation_setup_pci(void)
  71 {
  72         struct device_node *np;
  73
  74         /* Lookup PCI host bridges */
  75         for_each_compatible_node(np, "pci", "mpc10x-pci")
  76                 linkstation_add_bridge(np);
  77 }
  78
  79 /*
  80  * Interrupt setup and service.  Interrupts on the linkstation come
  81  * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
  82  */
  83 static void __init linkstation_init_IRQ(void)
  84 {
  85         struct mpic *mpic;
  86
  87         mpic = mpic_alloc(NULL, 0, 0, 4, 0, " EPIC     ");
  88         BUG_ON(mpic == NULL);
  89
  90         /* PCI IRQs */
  91         mpic_assign_isu(mpic, 0, mpic->paddr + 0x10200);
  92
  93         /* I2C */
  94         mpic_assign_isu(mpic, 1, mpic->paddr + 0x11000);
  95
  96         /* ttyS0, ttyS1 */
  97         mpic_assign_isu(mpic, 2, mpic->paddr + 0x11100);
  98
  99         mpic_init(mpic);
 100 }
 101
 102 extern void avr_uart_configure(void);
 103 extern void avr_uart_send(const char);
 104
 105 static void __noreturn linkstation_restart(char *cmd)
 106 {
 107         local_irq_disable();
 108
 109         /* Reset system via AVR */
 110         avr_uart_configure();
 111         /* Send reboot command */
 112         avr_uart_send('C');
 113
 114         for(;;)  /* Spin until reset happens */
 115                 avr_uart_send('G');     /* "kick" */
 116 }
 117
 118 static void __noreturn linkstation_power_off(void)
 119 {
 120         local_irq_disable();
 121
 122         /* Power down system via AVR */
 123         avr_uart_configure();
 124         /* send shutdown command */
 125         avr_uart_send('E');
 126
 127         for(;;)  /* Spin until power-off happens */
 128                 avr_uart_send('G');     /* "kick" */
 129         /* NOTREACHED */
 130 }
 131
 132 static void __noreturn linkstation_halt(void)
 133 {
 134         linkstation_power_off();
 135         /* NOTREACHED */
 136 }
 137
 138 static void linkstation_show_cpuinfo(struct seq_file *m)
 139 {
 140         seq_printf(m, "vendor\t\t: Buffalo Technology\n");
 141         seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
 142 }
 143
 144 static int __init linkstation_probe(void)
 145 {
 146         pm_power_off = linkstation_power_off;
 147
 148         return 1;
 149 }
 150
 151 define_machine(linkstation){
 152         .name                   = "Buffalo Linkstation",
 153         .compatible             = "linkstation",
 154         .probe                  = linkstation_probe,
 155         .setup_arch             = linkstation_setup_arch,
 156         .discover_phbs          = linkstation_setup_pci,
 157         .init_IRQ               = linkstation_init_IRQ,
 158         .show_cpuinfo           = linkstation_show_cpuinfo,
 159         .get_irq                = mpic_get_irq,
 160         .restart                = linkstation_restart,
 161         .halt                   = linkstation_halt,
 162 };