arch/v850/kernel/as85ep1.c

   1 /*
   2  * arch/v850/kernel/as85ep1.c -- AS85EP1 V850E 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/config.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/major.h>
  20 #include <linux/irq.h>
  21
  22 #include <asm/machdep.h>
  23 #include <asm/atomic.h>
  24 #include <asm/page.h>
  25 #include <asm/v850e_timer_d.h>
  26 #include <asm/v850e_uart.h>
  27
  28 #include "mach.h"
  29
  30
  31 /* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see
  32    mach_reserve_bootmem for details); use both as one big area.  */
  33 #define RAM_START       SRAM_ADDR
  34 #define RAM_END         (SDRAM_ADDR + SDRAM_SIZE)
  35
  36 /* The bits of this port are connected to an 8-LED bar-graph.  */
  37 #define LEDS_PORT       4
  38
  39
  40 static void as85ep1_led_tick (void);
  41
  42 extern char _intv_copy_src_start, _intv_copy_src_end;
  43 extern char _intv_copy_dst_start;
  44
  45
  46 void __init mach_early_init (void)
  47 {
  48 #ifndef CONFIG_ROM_KERNEL
  49         const u32 *src;
  50         register u32 *dst asm ("ep");
  51 #endif
  52
  53         AS85EP1_CSC(0) = 0x0403;
  54         AS85EP1_BCT(0) = 0xB8B8;
  55         AS85EP1_DWC(0) = 0x0104;
  56         AS85EP1_BCC    = 0x0012;
  57         AS85EP1_ASC    = 0;
  58         AS85EP1_LBS    = 0x00A9;
  59
  60         AS85EP1_PORT_PMC(6)  = 0xFF; /* valid A0,A1,A20-A25 */
  61         AS85EP1_PORT_PMC(7)  = 0x0E; /* valid CS1-CS3       */
  62         AS85EP1_PORT_PMC(9)  = 0xFF; /* valid D16-D23       */
  63         AS85EP1_PORT_PMC(10) = 0xFF; /* valid D24-D31       */
  64
  65         AS85EP1_RFS(1) = 0x800c;
  66         AS85EP1_RFS(3) = 0x800c;
  67         AS85EP1_SCR(1) = 0x20A9;
  68         AS85EP1_SCR(3) = 0x20A9;
  69
  70 #ifndef CONFIG_ROM_KERNEL
  71         /* The early chip we have is buggy, and writing the interrupt
  72            vectors into low RAM may screw up, so for non-ROM kernels, we
  73            only rely on the reset vector being downloaded, and copy the
  74            rest of the interrupt vectors into place here.  The specific bug
  75            is that writing address N, where (N & 0x10) == 0x10, will _also_
  76            write to address (N - 0x10).  We avoid this (effectively) by
  77            writing in 16-byte chunks backwards from the end.  */
  78
  79         AS85EP1_IRAMM = 0x3;    /* "write-mode" for the internal instruction memory */
  80
  81         src = (u32 *)(((u32)&_intv_copy_src_end - 1) & ~0xF);
  82         dst = (u32 *)&_intv_copy_dst_start
  83                 + (src - (u32 *)&_intv_copy_src_start);
  84         do {
  85                 u32 t0 = src[0], t1 = src[1], t2 = src[2], t3 = src[3];
  86                 dst[0] = t0; dst[1] = t1; dst[2] = t2; dst[3] = t3;
  87                 dst -= 4;
  88                 src -= 4;
  89         } while (src > (u32 *)&_intv_copy_src_start);
  90
  91         AS85EP1_IRAMM = 0x0;    /* "read-mode" for the internal instruction memory */
  92 #endif /* !CONFIG_ROM_KERNEL */
  93
  94         v850e_intc_disable_irqs ();
  95 }
  96
  97 void __init mach_setup (char **cmdline)
  98 {
  99         AS85EP1_PORT_PMC (LEDS_PORT) = 0; /* Make the LEDs port an I/O port. */
 100         AS85EP1_PORT_PM (LEDS_PORT) = 0; /* Make all the bits output pins.  */
 101         mach_tick = as85ep1_led_tick;
 102 }
 103
 104 void __init mach_get_physical_ram (unsigned long *ram_start,
 105                                    unsigned long *ram_len)
 106 {
 107         *ram_start = RAM_START;
 108         *ram_len = RAM_END - RAM_START;
 109 }
 110
 111 /* Convenience macros.  */
 112 #define SRAM_END        (SRAM_ADDR + SRAM_SIZE)
 113 #define SDRAM_END       (SDRAM_ADDR + SDRAM_SIZE)
 114
 115 void __init mach_reserve_bootmem ()
 116 {
 117         if (SDRAM_ADDR < RAM_END && SDRAM_ADDR > RAM_START)
 118                 /* We can't use the space between SRAM and SDRAM, so
 119                    prevent the kernel from trying.  */
 120                 reserve_bootmem (SRAM_END, SDRAM_ADDR - SRAM_END);
 121 }
 122
 123 void mach_gettimeofday (struct timespec *tv)
 124 {
 125         tv->tv_sec = 0;
 126         tv->tv_nsec = 0;
 127 }
 128
 129 void __init mach_sched_init (struct irqaction *timer_action)
 130 {
 131         /* Start hardware timer.  */
 132         v850e_timer_d_configure (0, HZ);
 133         /* Install timer interrupt handler.  */
 134         setup_irq (IRQ_INTCMD(0), timer_action);
 135 }
 136
 137 static struct v850e_intc_irq_init irq_inits[] = {
 138         { "IRQ", 0,             NUM_MACH_IRQS,  1, 7 },
 139         { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 },
 140         { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 },
 141         { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 },
 142         { "SR",  IRQ_INTSR(0),  IRQ_INTSR_NUM,  3, 4 },
 143         { "ST",  IRQ_INTST(0),  IRQ_INTST_NUM,  3, 5 },
 144         { 0 }
 145 };
 146 #define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1)
 147
 148 static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS];
 149
 150 void __init mach_init_irqs (void)
 151 {
 152         v850e_intc_init_irq_types (irq_inits, hw_itypes);
 153 }
 154
 155 void machine_restart (char *__unused)
 156 {
 157 #ifdef CONFIG_RESET_GUARD
 158         disable_reset_guard ();
 159 #endif
 160         asm ("jmp r0"); /* Jump to the reset vector.  */
 161 }
 162
 163 EXPORT_SYMBOL(machine_restart);
 164
 165 void machine_halt (void)
 166 {
 167 #ifdef CONFIG_RESET_GUARD
 168         disable_reset_guard ();
 169 #endif
 170         local_irq_disable ();   /* Ignore all interrupts.  */
 171         AS85EP1_PORT_IO (LEDS_PORT) = 0xAA;     /* Note that we halted.  */
 172         for (;;)
 173                 asm ("halt; nop; nop; nop; nop; nop");
 174 }
 175
 176 EXPORT_SYMBOL(machine_halt);
 177
 178 void machine_power_off (void)
 179 {
 180         machine_halt ();
 181 }
 182
 183 EXPORT_SYMBOL(machine_power_off);
 184
 185 /* Called before configuring an on-chip UART.  */
 186 void as85ep1_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud)
 187 {
 188         /* Make the shared uart/port pins be uart pins.  */
 189         AS85EP1_PORT_PMC(3) |= (0x5 << chan);
 190
 191         /* The AS85EP1 connects some general-purpose I/O pins on the CPU to
 192            the RTS/CTS lines of UART 1's serial connection.  I/O pins P53
 193            and P54 are RTS and CTS respectively.  */
 194         if (chan == 1) {
 195                 /* Put P53 & P54 in I/O port mode.  */
 196                 AS85EP1_PORT_PMC(5) &= ~0x18;
 197                 /* Make P53 an output, and P54 an input.  */
 198                 AS85EP1_PORT_PM(5) |=  0x10;
 199         }
 200 }
 201
 202 /* Minimum and maximum bounds for the moving upper LED boundary in the
 203    clock tick display.  */
 204 #define MIN_MAX_POS 0
 205 #define MAX_MAX_POS 7
 206
 207 /* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if
 208    we pick 6 and 0 as above, we get 49 cycles, which is when divided into
 209    the standard 100 value for HZ, gives us an almost 1s total time.  */
 210 #define TICKS_PER_FRAME \
 211         (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS))
 212
 213 static void as85ep1_led_tick ()
 214 {
 215         static unsigned counter = 0;
 216
 217         if (++counter == TICKS_PER_FRAME) {
 218                 static int pos = 0, max_pos = MAX_MAX_POS, dir = 1;
 219
 220                 if (dir > 0 && pos == max_pos) {
 221                         dir = -1;
 222                         if (max_pos == MIN_MAX_POS)
 223                                 max_pos = MAX_MAX_POS;
 224                         else
 225                                 max_pos--;
 226                 } else {
 227                         if (dir < 0 && pos == 0)
 228                                 dir = 1;
 229
 230                         if (pos + dir <= max_pos) {
 231                                 /* Each bit of port 0 has a LED. */
 232                                 set_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT));
 233                                 pos += dir;
 234                                 clear_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT));
 235                         }
 236                 }
 237
 238                 counter = 0;
 239         }
 240 }