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/init.h>
  15 #include <linux/irq.h>
  16 #include <linux/fs.h>
  17 #include <linux/module.h>
  18 #include <linux/kernel.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 /* This says `HALt.' in LEDese.  */
  71 static unsigned char halt_leds_msg[] = { 0x76, 0x77, 0x38, 0xF8 };
  72
  73 void machine_halt (void)
  74 {
  75 #ifdef CONFIG_RESET_GUARD
  76         disable_reset_guard ();
  77 #endif
  78
  79         /* Ignore all interrupts.  */
  80         local_irq_disable ();
  81
  82         /* Write a little message.  */
  83         write_leds (0, halt_leds_msg, sizeof halt_leds_msg);
  84
  85         /* Really halt.  */
  86         for (;;)
  87                 asm ("halt; nop; nop; nop; nop; nop");
  88 }
  89
  90 void machine_power_off (void)
  91 {
  92         machine_halt ();
  93 }
  94
  95 \f
  96 /* Animated LED display for timer tick.  */
  97
  98 #define TICK_UPD_FREQ   6
  99 static int tick_frames[][10] = {
 100         { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, -1 },
 101         { 0x63, 0x5c, -1 },
 102         { 0x5c, 0x00, -1 },
 103         { 0x63, 0x00, -1 },
 104         { -1 }
 105 };
 106
 107 static void led_tick ()
 108 {
 109         static unsigned counter = 0;
 110
 111         if (++counter == (HZ / TICK_UPD_FREQ)) {
 112                 /* Which frame we're currently displaying for each digit.  */
 113                 static unsigned frame_nums[LED_NUM_DIGITS] = { 0 };
 114                 /* Display image.  */
 115                 static unsigned char image[LED_NUM_DIGITS] = { 0 };
 116                 unsigned char prev_image[LED_NUM_DIGITS];
 117                 int write_to_leds = 1; /* true if we should actually display */
 118                 int digit;
 119
 120                 /* We check to see if the physical LEDs contains what we last
 121                    wrote to them; if not, we suppress display (this is so that
 122                    users can write to the LEDs, and not have their output
 123                    overwritten).  As a special case, we start writing again if
 124                    all the LEDs are blank, or our display image is all zeros
 125                    (indicating that this is the initial update, when the actual
 126                    LEDs might contain random data).  */
 127                 read_leds (0, prev_image, LED_NUM_DIGITS);
 128                 for (digit = 0; digit < LED_NUM_DIGITS; digit++)
 129                         if (image[digit] != prev_image[digit]
 130                             && image[digit] && prev_image[digit])
 131                         {
 132                                 write_to_leds = 0;
 133                                 break;
 134                         }
 135
 136                 /* Update display image.  */
 137                 for (digit = 0;
 138                      digit < LED_NUM_DIGITS && tick_frames[digit][0] >= 0;
 139                      digit++)
 140                 {
 141                         int frame = tick_frames[digit][frame_nums[digit]];
 142                         if (frame < 0) {
 143                                 image[digit] = tick_frames[digit][0];
 144                                 frame_nums[digit] = 1;
 145                         } else {
 146                                 image[digit] = frame;
 147                                 frame_nums[digit]++;
 148                                 break;
 149                         }
 150                 }
 151
 152                 if (write_to_leds)
 153                         /* Write the display image to the physical LEDs.  */
 154                         write_leds (0, image, LED_NUM_DIGITS);
 155
 156                 counter = 0;
 157         }
 158 }
 159
 160 \f
 161 /* Mother-A interrupts.  */
 162
 163 #ifdef CONFIG_RTE_GBUS_INT
 164
 165 #define L GBUS_INT_PRIORITY_LOW
 166 #define M GBUS_INT_PRIORITY_MEDIUM
 167 #define H GBUS_INT_PRIORITY_HIGH
 168
 169 static struct gbus_int_irq_init gbus_irq_inits[] = {
 170 #ifdef CONFIG_RTE_MB_A_PCI
 171         { "MB_A_LAN",   IRQ_MB_A_LAN,           1,                   1, L },
 172         { "MB_A_PCI1",  IRQ_MB_A_PCI1(0),       IRQ_MB_A_PCI1_NUM,   1, L },
 173         { "MB_A_PCI2",  IRQ_MB_A_PCI2(0),       IRQ_MB_A_PCI2_NUM,   1, L },
 174         { "MB_A_EXT",   IRQ_MB_A_EXT(0),        IRQ_MB_A_EXT_NUM,    1, L },
 175         { "MB_A_USB_OC",IRQ_MB_A_USB_OC(0),     IRQ_MB_A_USB_OC_NUM, 1, L },
 176         { "MB_A_PCMCIA_OC",IRQ_MB_A_PCMCIA_OC,  1,                   1, L },
 177 #endif
 178         { 0 }
 179 };
 180 #define NUM_GBUS_IRQ_INITS (ARRAY_SIZE(gbus_irq_inits) - 1)
 181
 182 static struct hw_interrupt_type gbus_hw_itypes[NUM_GBUS_IRQ_INITS];
 183
 184 #endif /* CONFIG_RTE_GBUS_INT */
 185
 186
 187 void __init rte_cb_init_irqs (void)
 188 {
 189 #ifdef CONFIG_RTE_GBUS_INT
 190         gbus_int_init_irqs ();
 191         gbus_int_init_irq_types (gbus_irq_inits, gbus_hw_itypes);
 192 #endif /* CONFIG_RTE_GBUS_INT */
 193 }