arch/v850/kernel/rte_cb.c

   1 /*
   2  * include/asm-v850/rte_cb.c -- Midas lab RTE-CB series of evaluation boards
   3  *
   4  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <linux/fs.h>
  18 #include <linux/module.h>
  19
  20 #include <asm/machdep.h>
  21 #include <asm/v850e_uart.h>
  22
  23 #include "mach.h"
  24
  25 static void led_tick (void);
  26
  27 /* LED access routines.  */
  28 extern unsigned read_leds (int pos, char *buf, int len);
  29 extern unsigned write_leds (int pos, const char *buf, int len);
  30
  31 #ifdef CONFIG_RTE_CB_MULTI
  32 extern void multi_init (void);
  33 #endif
  34
  35 \f
  36 void __init rte_cb_early_init (void)
  37 {
  38         v850e_intc_disable_irqs ();
  39
  40 #ifdef CONFIG_RTE_CB_MULTI
  41         multi_init ();
  42 #endif
  43 }
  44
  45 void __init mach_setup (char **cmdline)
  46 {
  47 #ifdef CONFIG_RTE_MB_A_PCI
  48         /* Probe for Mother-A, and print a message if we find it.  */
  49         *(volatile unsigned long *)MB_A_SRAM_ADDR = 0xDEADBEEF;
  50         if (*(volatile unsigned long *)MB_A_SRAM_ADDR == 0xDEADBEEF) {
  51                 *(volatile unsigned long *)MB_A_SRAM_ADDR = 0x12345678;
  52                 if (*(volatile unsigned long *)MB_A_SRAM_ADDR == 0x12345678)
  53                         printk (KERN_INFO
  54                                 "          NEC SolutionGear/Midas lab"
  55                                 " RTE-MOTHER-A motherboard\n");
  56         }
  57 #endif /* CONFIG_RTE_MB_A_PCI */
  58
  59         mach_tick = led_tick;
  60 }
  61
  62 void machine_restart (char *__unused)
  63 {
  64 #ifdef CONFIG_RESET_GUARD
  65         disable_reset_guard ();
  66 #endif
  67         asm ("jmp r0"); /* Jump to the reset vector.  */
  68 }
  69
  70 EXPORT_SYMBOL(machine_restart);
  71
  72 /* This says `HALt.' in LEDese.  */
  73 static unsigned char halt_leds_msg[] = { 0x76, 0x77, 0x38, 0xF8 };
  74
  75 void machine_halt (void)
  76 {
  77 #ifdef CONFIG_RESET_GUARD
  78         disable_reset_guard ();
  79 #endif
  80
  81         /* Ignore all interrupts.  */
  82         local_irq_disable ();
  83
  84         /* Write a little message.  */
  85         write_leds (0, halt_leds_msg, sizeof halt_leds_msg);
  86
  87         /* Really halt.  */
  88         for (;;)
  89                 asm ("halt; nop; nop; nop; nop; nop");
  90 }
  91
  92 EXPORT_SYMBOL(machine_halt);
  93
  94 void machine_power_off (void)
  95 {
  96         machine_halt ();
  97 }
  98
  99 EXPORT_SYMBOL(machine_power_off);
 100
 101 \f
 102 /* Animated LED display for timer tick.  */
 103
 104 #define TICK_UPD_FREQ   6
 105 static int tick_frames[][10] = {
 106         { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, -1 },
 107         { 0x63, 0x5c, -1 },
 108         { 0x5c, 0x00, -1 },
 109         { 0x63, 0x00, -1 },
 110         { -1 }
 111 };
 112
 113 static void led_tick ()
 114 {
 115         static unsigned counter = 0;
 116
 117         if (++counter == (HZ / TICK_UPD_FREQ)) {
 118                 /* Which frame we're currently displaying for each digit.  */
 119                 static unsigned frame_nums[LED_NUM_DIGITS] = { 0 };
 120                 /* Display image.  */
 121                 static unsigned char image[LED_NUM_DIGITS] = { 0 };
 122                 unsigned char prev_image[LED_NUM_DIGITS];
 123                 int write_to_leds = 1; /* true if we should actually display */
 124                 int digit;
 125
 126                 /* We check to see if the physical LEDs contains what we last
 127                    wrote to them; if not, we suppress display (this is so that
 128                    users can write to the LEDs, and not have their output
 129                    overwritten).  As a special case, we start writing again if
 130                    all the LEDs are blank, or our display image is all zeros
 131                    (indicating that this is the initial update, when the actual
 132                    LEDs might contain random data).  */
 133                 read_leds (0, prev_image, LED_NUM_DIGITS);
 134                 for (digit = 0; digit < LED_NUM_DIGITS; digit++)
 135                         if (image[digit] != prev_image[digit]
 136                             && image[digit] && prev_image[digit])
 137                         {
 138                                 write_to_leds = 0;
 139                                 break;
 140                         }
 141
 142                 /* Update display image.  */
 143                 for (digit = 0;
 144                      digit < LED_NUM_DIGITS && tick_frames[digit][0] >= 0;
 145                      digit++)
 146                 {
 147                         int frame = tick_frames[digit][frame_nums[digit]];
 148                         if (frame < 0) {
 149                                 image[digit] = tick_frames[digit][0];
 150                                 frame_nums[digit] = 1;
 151                         } else {
 152                                 image[digit] = frame;
 153                                 frame_nums[digit]++;
 154                                 break;
 155                         }
 156                 }
 157
 158                 if (write_to_leds)
 159                         /* Write the display image to the physical LEDs.  */
 160                         write_leds (0, image, LED_NUM_DIGITS);
 161
 162                 counter = 0;
 163         }
 164 }
 165
 166 \f
 167 /* Mother-A interrupts.  */
 168
 169 #ifdef CONFIG_RTE_GBUS_INT
 170
 171 #define L GBUS_INT_PRIORITY_LOW
 172 #define M GBUS_INT_PRIORITY_MEDIUM
 173 #define H GBUS_INT_PRIORITY_HIGH
 174
 175 static struct gbus_int_irq_init gbus_irq_inits[] = {
 176 #ifdef CONFIG_RTE_MB_A_PCI
 177         { "MB_A_LAN",   IRQ_MB_A_LAN,           1,                   1, L },
 178         { "MB_A_PCI1",  IRQ_MB_A_PCI1(0),       IRQ_MB_A_PCI1_NUM,   1, L },
 179         { "MB_A_PCI2",  IRQ_MB_A_PCI2(0),       IRQ_MB_A_PCI2_NUM,   1, L },
 180         { "MB_A_EXT",   IRQ_MB_A_EXT(0),        IRQ_MB_A_EXT_NUM,    1, L },
 181         { "MB_A_USB_OC",IRQ_MB_A_USB_OC(0),     IRQ_MB_A_USB_OC_NUM, 1, L },
 182         { "MB_A_PCMCIA_OC",IRQ_MB_A_PCMCIA_OC,  1,                   1, L },
 183 #endif
 184         { 0 }
 185 };
 186 #define NUM_GBUS_IRQ_INITS  \
 187    ((sizeof gbus_irq_inits / sizeof gbus_irq_inits[0]) - 1)
 188
 189 static struct hw_interrupt_type gbus_hw_itypes[NUM_GBUS_IRQ_INITS];
 190
 191 #endif /* CONFIG_RTE_GBUS_INT */
 192
 193
 194 void __init rte_cb_init_irqs (void)
 195 {
 196 #ifdef CONFIG_RTE_GBUS_INT
 197         gbus_int_init_irqs ();
 198         gbus_int_init_irq_types (gbus_irq_inits, gbus_hw_itypes);
 199 #endif /* CONFIG_RTE_GBUS_INT */
 200 }