arch/v850/kernel/anna.c

   1 /*
   2  * arch/v850/kernel/anna.c -- Anna V850E2 evaluation chip/board
   3  *
   4  *  Copyright (C) 2002,03  NEC Electronics Corporation
   5  *  Copyright (C) 2002,03  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/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/major.h>
  19 #include <linux/irq.h>
  20
  21 #include <asm/machdep.h>
  22 #include <asm/atomic.h>
  23 #include <asm/page.h>
  24 #include <asm/v850e_timer_d.h>
  25 #include <asm/v850e_uart.h>
  26
  27 #include "mach.h"
  28
  29
  30 /* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see
  31    mach_reserve_bootmem for details); use both as one big area.  */
  32 #define RAM_START       SRAM_ADDR
  33 #define RAM_END         (SDRAM_ADDR + SDRAM_SIZE)
  34
  35 /* The bits of this port are connected to an 8-LED bar-graph.  */
  36 #define LEDS_PORT       0
  37
  38
  39 static void anna_led_tick (void);
  40
  41
  42 void __init mach_early_init (void)
  43 {
  44         ANNA_ILBEN    = 0;
  45
  46         V850E2_CSC(0) = 0x402F;
  47         V850E2_CSC(1) = 0x4000;
  48         V850E2_BPC    = 0;
  49         V850E2_BSC    = 0xAAAA;
  50         V850E2_BEC    = 0;
  51
  52 #if 0
  53         V850E2_BHC    = 0xFFFF; /* icache all memory, dcache all */
  54 #else
  55         V850E2_BHC    = 0;      /* cache no memory */
  56 #endif
  57         V850E2_BCT(0) = 0xB088;
  58         V850E2_BCT(1) = 0x0008;
  59         V850E2_DWC(0) = 0x0027;
  60         V850E2_DWC(1) = 0;
  61         V850E2_BCC    = 0x0006;
  62         V850E2_ASC    = 0;
  63         V850E2_LBS    = 0x0089;
  64         V850E2_SCR(3) = 0x21A9;
  65         V850E2_RFS(3) = 0x8121;
  66
  67         v850e_intc_disable_irqs ();
  68 }
  69
  70 void __init mach_setup (char **cmdline)
  71 {
  72         ANNA_PORT_PM (LEDS_PORT) = 0;   /* Make all LED pins output pins.  */
  73         mach_tick = anna_led_tick;
  74 }
  75
  76 void __init mach_get_physical_ram (unsigned long *ram_start,
  77                                    unsigned long *ram_len)
  78 {
  79         *ram_start = RAM_START;
  80         *ram_len = RAM_END - RAM_START;
  81 }
  82
  83 void __init mach_reserve_bootmem ()
  84 {
  85         /* The space between SRAM and SDRAM is filled with duplicate
  86            images of SRAM.  Prevent the kernel from using them.  */
  87         reserve_bootmem (SRAM_ADDR + SRAM_SIZE,
  88                          SDRAM_ADDR - (SRAM_ADDR + SRAM_SIZE));
  89 }
  90
  91 void mach_gettimeofday (struct timespec *tv)
  92 {
  93         tv->tv_sec = 0;
  94         tv->tv_nsec = 0;
  95 }
  96
  97 void __init mach_sched_init (struct irqaction *timer_action)
  98 {
  99         /* Start hardware timer.  */
 100         v850e_timer_d_configure (0, HZ);
 101         /* Install timer interrupt handler.  */
 102         setup_irq (IRQ_INTCMD(0), timer_action);
 103 }
 104
 105 static struct v850e_intc_irq_init irq_inits[] = {
 106         { "IRQ", 0,             NUM_MACH_IRQS,  1, 7 },
 107         { "PIN", IRQ_INTP(0),   IRQ_INTP_NUM,   1, 4 },
 108         { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 },
 109         { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 },
 110         { "DMA", IRQ_INTDMA(0), IRQ_INTDMA_NUM, 1, 2 },
 111         { "DMXER", IRQ_INTDMXER,1,              1, 2 },
 112         { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 },
 113         { "SR",  IRQ_INTSR(0),  IRQ_INTSR_NUM,  3, 4 },
 114         { "ST",  IRQ_INTST(0),  IRQ_INTST_NUM,  3, 5 },
 115         { 0 }
 116 };
 117 #define NUM_IRQ_INITS (ARRAY_SIZE(irq_inits) - 1)
 118
 119 static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS];
 120
 121 void __init mach_init_irqs (void)
 122 {
 123         v850e_intc_init_irq_types (irq_inits, hw_itypes);
 124 }
 125
 126 void machine_restart (char *__unused)
 127 {
 128 #ifdef CONFIG_RESET_GUARD
 129         disable_reset_guard ();
 130 #endif
 131         asm ("jmp r0"); /* Jump to the reset vector.  */
 132 }
 133
 134 void machine_halt (void)
 135 {
 136 #ifdef CONFIG_RESET_GUARD
 137         disable_reset_guard ();
 138 #endif
 139         local_irq_disable ();   /* Ignore all interrupts.  */
 140         ANNA_PORT_IO(LEDS_PORT) = 0xAA; /* Note that we halted.  */
 141         for (;;)
 142                 asm ("halt; nop; nop; nop; nop; nop");
 143 }
 144
 145 void machine_power_off (void)
 146 {
 147         machine_halt ();
 148 }
 149
 150 /* Called before configuring an on-chip UART.  */
 151 void anna_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud)
 152 {
 153         /* The Anna connects some general-purpose I/O pins on the CPU to
 154            the RTS/CTS lines of UART 1's serial connection.  I/O pins P07
 155            and P37 are RTS and CTS respectively.  */
 156         if (chan == 1) {
 157                 ANNA_PORT_PM(0) &= ~0x80; /* P07 in output mode */
 158                 ANNA_PORT_PM(3) |=  0x80; /* P37 in input mode */
 159         }
 160 }
 161
 162 /* Minimum and maximum bounds for the moving upper LED boundary in the
 163    clock tick display.  We can't use the last bit because it's used for
 164    UART0's CTS output.  */
 165 #define MIN_MAX_POS 0
 166 #define MAX_MAX_POS 6
 167
 168 /* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if
 169    we pick 6 and 0 as above, we get 49 cycles, which is when divided into
 170    the standard 100 value for HZ, gives us an almost 1s total time.  */
 171 #define TICKS_PER_FRAME \
 172         (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS))
 173
 174 static void anna_led_tick ()
 175 {
 176         static unsigned counter = 0;
 177
 178         if (++counter == TICKS_PER_FRAME) {
 179                 static int pos = 0, max_pos = MAX_MAX_POS, dir = 1;
 180
 181                 if (dir > 0 && pos == max_pos) {
 182                         dir = -1;
 183                         if (max_pos == MIN_MAX_POS)
 184                                 max_pos = MAX_MAX_POS;
 185                         else
 186                                 max_pos--;
 187                 } else {
 188                         if (dir < 0 && pos == 0)
 189                                 dir = 1;
 190
 191                         if (pos + dir <= max_pos) {
 192                                 /* Each bit of port 0 has a LED. */
 193                                 clear_bit (pos, &ANNA_PORT_IO(LEDS_PORT));
 194                                 pos += dir;
 195                                 set_bit (pos, &ANNA_PORT_IO(LEDS_PORT));
 196                         }
 197                 }
 198
 199                 counter = 0;
 200         }
 201 }