platforms/embedded6xx/linkstation.c

0001 /*
0002  * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
0003  *
0004  * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
0005  *
0006  * Based on sandpoint.c by Mark A. Greer
0007  *
0008  * This file is licensed under the terms of the GNU General Public License
0009  * version 2.  This program is licensed "as is" without any warranty of
0010  * any kind, whether express or implied.
0011  */
0012
0013 #include <linux/kernel.h>
0014 #include <linux/initrd.h>
0015 #include <linux/of_platform.h>
0016
0017 #include <asm/time.h>
0018 #include <asm/mpic.h>
0019 #include <asm/pci-bridge.h>
0020
0021 #include "mpc10x.h"
0022
0023 static const struct of_device_id of_bus_ids[] __initconst = {
0024     { .type = "soc", },
0025     { .compatible = "simple-bus", },
0026     {},
0027 };
0028
0029 static int __init declare_of_platform_devices(void)
0030 {
0031     of_platform_bus_probe(NULL, of_bus_ids, NULL);
0032     return 0;
0033 }
0034 machine_device_initcall(linkstation, declare_of_platform_devices);
0035
0036 static int __init linkstation_add_bridge(struct device_node *dev)
0037 {
0038 #ifdef CONFIG_PCI
0039     int len;
0040     struct pci_controller *hose;
0041     const int *bus_range;
0042
0043     printk("Adding PCI host bridge %pOF\n", dev);
0044
0045     bus_range = of_get_property(dev, "bus-range", &len);
0046     if (bus_range == NULL || len < 2 * sizeof(int))
0047         printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
0048                 " bus 0\n", dev);
0049
0050     hose = pcibios_alloc_controller(dev);
0051     if (hose == NULL)
0052         return -ENOMEM;
0053     hose->first_busno = bus_range ? bus_range[0] : 0;
0054     hose->last_busno = bus_range ? bus_range[1] : 0xff;
0055     setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
0056
0057     /* Interpret the "ranges" property */
0058     /* This also maps the I/O region and sets isa_io/mem_base */
0059     pci_process_bridge_OF_ranges(hose, dev, 1);
0060 #endif
0061     return 0;
0062 }
0063
0064 static void __init linkstation_setup_arch(void)
0065 {
0066     printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
0067     printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
0068 }
0069
0070 static void __init linkstation_setup_pci(void)
0071 {
0072     struct device_node *np;
0073
0074     /* Lookup PCI host bridges */
0075     for_each_compatible_node(np, "pci", "mpc10x-pci")
0076         linkstation_add_bridge(np);
0077 }
0078
0079 /*
0080  * Interrupt setup and service.  Interrupts on the linkstation come
0081  * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
0082  */
0083 static void __init linkstation_init_IRQ(void)
0084 {
0085     struct mpic *mpic;
0086
0087     mpic = mpic_alloc(NULL, 0, 0, 4, 0, " EPIC     ");
0088     BUG_ON(mpic == NULL);
0089
0090     /* PCI IRQs */
0091     mpic_assign_isu(mpic, 0, mpic->paddr + 0x10200);
0092
0093     /* I2C */
0094     mpic_assign_isu(mpic, 1, mpic->paddr + 0x11000);
0095
0096     /* ttyS0, ttyS1 */
0097     mpic_assign_isu(mpic, 2, mpic->paddr + 0x11100);
0098
0099     mpic_init(mpic);
0100 }
0101
0102 extern void avr_uart_configure(void);
0103 extern void avr_uart_send(const char);
0104
0105 static void __noreturn linkstation_restart(char *cmd)
0106 {
0107     local_irq_disable();
0108
0109     /* Reset system via AVR */
0110     avr_uart_configure();
0111     /* Send reboot command */
0112     avr_uart_send('C');
0113
0114     for(;;)  /* Spin until reset happens */
0115         avr_uart_send('G'); /* "kick" */
0116 }
0117
0118 static void __noreturn linkstation_power_off(void)
0119 {
0120     local_irq_disable();
0121
0122     /* Power down system via AVR */
0123     avr_uart_configure();
0124     /* send shutdown command */
0125     avr_uart_send('E');
0126
0127     for(;;)  /* Spin until power-off happens */
0128         avr_uart_send('G'); /* "kick" */
0129     /* NOTREACHED */
0130 }
0131
0132 static void __noreturn linkstation_halt(void)
0133 {
0134     linkstation_power_off();
0135     /* NOTREACHED */
0136 }
0137
0138 static void linkstation_show_cpuinfo(struct seq_file *m)
0139 {
0140     seq_printf(m, "vendor\t\t: Buffalo Technology\n");
0141     seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
0142 }
0143
0144 static int __init linkstation_probe(void)
0145 {
0146     if (!of_machine_is_compatible("linkstation"))
0147         return 0;
0148
0149     pm_power_off = linkstation_power_off;
0150
0151     return 1;
0152 }
0153
0154 define_machine(linkstation){
0155     .name           = "Buffalo Linkstation",
0156     .probe          = linkstation_probe,
0157     .setup_arch         = linkstation_setup_arch,
0158     .discover_phbs      = linkstation_setup_pci,
0159     .init_IRQ       = linkstation_init_IRQ,
0160     .show_cpuinfo       = linkstation_show_cpuinfo,
0161     .get_irq        = mpic_get_irq,
0162     .restart        = linkstation_restart,
0163     .halt           = linkstation_halt,
0164     .calibrate_decr     = generic_calibrate_decr,
0165 };