235 lines
6.3 KiB
C
235 lines
6.3 KiB
C
/*
|
|
* arch/v850/kernel/as85ep1.c -- AS85EP1 V850E evaluation chip/board
|
|
*
|
|
* Copyright (C) 2002,03 NEC Electronics Corporation
|
|
* Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/major.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/page.h>
|
|
#include <asm/v850e_timer_d.h>
|
|
#include <asm/v850e_uart.h>
|
|
|
|
#include "mach.h"
|
|
|
|
|
|
/* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see
|
|
mach_reserve_bootmem for details); use both as one big area. */
|
|
#define RAM_START SRAM_ADDR
|
|
#define RAM_END (SDRAM_ADDR + SDRAM_SIZE)
|
|
|
|
/* The bits of this port are connected to an 8-LED bar-graph. */
|
|
#define LEDS_PORT 4
|
|
|
|
|
|
static void as85ep1_led_tick (void);
|
|
|
|
extern char _intv_copy_src_start, _intv_copy_src_end;
|
|
extern char _intv_copy_dst_start;
|
|
|
|
|
|
void __init mach_early_init (void)
|
|
{
|
|
#ifndef CONFIG_ROM_KERNEL
|
|
const u32 *src;
|
|
register u32 *dst asm ("ep");
|
|
#endif
|
|
|
|
AS85EP1_CSC(0) = 0x0403;
|
|
AS85EP1_BCT(0) = 0xB8B8;
|
|
AS85EP1_DWC(0) = 0x0104;
|
|
AS85EP1_BCC = 0x0012;
|
|
AS85EP1_ASC = 0;
|
|
AS85EP1_LBS = 0x00A9;
|
|
|
|
AS85EP1_PORT_PMC(6) = 0xFF; /* valid A0,A1,A20-A25 */
|
|
AS85EP1_PORT_PMC(7) = 0x0E; /* valid CS1-CS3 */
|
|
AS85EP1_PORT_PMC(9) = 0xFF; /* valid D16-D23 */
|
|
AS85EP1_PORT_PMC(10) = 0xFF; /* valid D24-D31 */
|
|
|
|
AS85EP1_RFS(1) = 0x800c;
|
|
AS85EP1_RFS(3) = 0x800c;
|
|
AS85EP1_SCR(1) = 0x20A9;
|
|
AS85EP1_SCR(3) = 0x20A9;
|
|
|
|
#ifndef CONFIG_ROM_KERNEL
|
|
/* The early chip we have is buggy, and writing the interrupt
|
|
vectors into low RAM may screw up, so for non-ROM kernels, we
|
|
only rely on the reset vector being downloaded, and copy the
|
|
rest of the interrupt vectors into place here. The specific bug
|
|
is that writing address N, where (N & 0x10) == 0x10, will _also_
|
|
write to address (N - 0x10). We avoid this (effectively) by
|
|
writing in 16-byte chunks backwards from the end. */
|
|
|
|
AS85EP1_IRAMM = 0x3; /* "write-mode" for the internal instruction memory */
|
|
|
|
src = (u32 *)(((u32)&_intv_copy_src_end - 1) & ~0xF);
|
|
dst = (u32 *)&_intv_copy_dst_start
|
|
+ (src - (u32 *)&_intv_copy_src_start);
|
|
do {
|
|
u32 t0 = src[0], t1 = src[1], t2 = src[2], t3 = src[3];
|
|
dst[0] = t0; dst[1] = t1; dst[2] = t2; dst[3] = t3;
|
|
dst -= 4;
|
|
src -= 4;
|
|
} while (src > (u32 *)&_intv_copy_src_start);
|
|
|
|
AS85EP1_IRAMM = 0x0; /* "read-mode" for the internal instruction memory */
|
|
#endif /* !CONFIG_ROM_KERNEL */
|
|
|
|
v850e_intc_disable_irqs ();
|
|
}
|
|
|
|
void __init mach_setup (char **cmdline)
|
|
{
|
|
AS85EP1_PORT_PMC (LEDS_PORT) = 0; /* Make the LEDs port an I/O port. */
|
|
AS85EP1_PORT_PM (LEDS_PORT) = 0; /* Make all the bits output pins. */
|
|
mach_tick = as85ep1_led_tick;
|
|
}
|
|
|
|
void __init mach_get_physical_ram (unsigned long *ram_start,
|
|
unsigned long *ram_len)
|
|
{
|
|
*ram_start = RAM_START;
|
|
*ram_len = RAM_END - RAM_START;
|
|
}
|
|
|
|
/* Convenience macros. */
|
|
#define SRAM_END (SRAM_ADDR + SRAM_SIZE)
|
|
#define SDRAM_END (SDRAM_ADDR + SDRAM_SIZE)
|
|
|
|
void __init mach_reserve_bootmem ()
|
|
{
|
|
if (SDRAM_ADDR < RAM_END && SDRAM_ADDR > RAM_START)
|
|
/* We can't use the space between SRAM and SDRAM, so
|
|
prevent the kernel from trying. */
|
|
reserve_bootmem (SRAM_END, SDRAM_ADDR - SRAM_END);
|
|
}
|
|
|
|
void mach_gettimeofday (struct timespec *tv)
|
|
{
|
|
tv->tv_sec = 0;
|
|
tv->tv_nsec = 0;
|
|
}
|
|
|
|
void __init mach_sched_init (struct irqaction *timer_action)
|
|
{
|
|
/* Start hardware timer. */
|
|
v850e_timer_d_configure (0, HZ);
|
|
/* Install timer interrupt handler. */
|
|
setup_irq (IRQ_INTCMD(0), timer_action);
|
|
}
|
|
|
|
static struct v850e_intc_irq_init irq_inits[] = {
|
|
{ "IRQ", 0, NUM_MACH_IRQS, 1, 7 },
|
|
{ "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 },
|
|
{ "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 },
|
|
{ "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 },
|
|
{ "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 3, 4 },
|
|
{ "ST", IRQ_INTST(0), IRQ_INTST_NUM, 3, 5 },
|
|
{ 0 }
|
|
};
|
|
#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1)
|
|
|
|
static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS];
|
|
|
|
void __init mach_init_irqs (void)
|
|
{
|
|
v850e_intc_init_irq_types (irq_inits, hw_itypes);
|
|
}
|
|
|
|
void machine_restart (char *__unused)
|
|
{
|
|
#ifdef CONFIG_RESET_GUARD
|
|
disable_reset_guard ();
|
|
#endif
|
|
asm ("jmp r0"); /* Jump to the reset vector. */
|
|
}
|
|
|
|
void machine_halt (void)
|
|
{
|
|
#ifdef CONFIG_RESET_GUARD
|
|
disable_reset_guard ();
|
|
#endif
|
|
local_irq_disable (); /* Ignore all interrupts. */
|
|
AS85EP1_PORT_IO (LEDS_PORT) = 0xAA; /* Note that we halted. */
|
|
for (;;)
|
|
asm ("halt; nop; nop; nop; nop; nop");
|
|
}
|
|
|
|
void machine_power_off (void)
|
|
{
|
|
machine_halt ();
|
|
}
|
|
|
|
/* Called before configuring an on-chip UART. */
|
|
void as85ep1_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud)
|
|
{
|
|
/* Make the shared uart/port pins be uart pins. */
|
|
AS85EP1_PORT_PMC(3) |= (0x5 << chan);
|
|
|
|
/* The AS85EP1 connects some general-purpose I/O pins on the CPU to
|
|
the RTS/CTS lines of UART 1's serial connection. I/O pins P53
|
|
and P54 are RTS and CTS respectively. */
|
|
if (chan == 1) {
|
|
/* Put P53 & P54 in I/O port mode. */
|
|
AS85EP1_PORT_PMC(5) &= ~0x18;
|
|
/* Make P53 an output, and P54 an input. */
|
|
AS85EP1_PORT_PM(5) |= 0x10;
|
|
}
|
|
}
|
|
|
|
/* Minimum and maximum bounds for the moving upper LED boundary in the
|
|
clock tick display. */
|
|
#define MIN_MAX_POS 0
|
|
#define MAX_MAX_POS 7
|
|
|
|
/* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if
|
|
we pick 6 and 0 as above, we get 49 cycles, which is when divided into
|
|
the standard 100 value for HZ, gives us an almost 1s total time. */
|
|
#define TICKS_PER_FRAME \
|
|
(HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS))
|
|
|
|
static void as85ep1_led_tick ()
|
|
{
|
|
static unsigned counter = 0;
|
|
|
|
if (++counter == TICKS_PER_FRAME) {
|
|
static int pos = 0, max_pos = MAX_MAX_POS, dir = 1;
|
|
|
|
if (dir > 0 && pos == max_pos) {
|
|
dir = -1;
|
|
if (max_pos == MIN_MAX_POS)
|
|
max_pos = MAX_MAX_POS;
|
|
else
|
|
max_pos--;
|
|
} else {
|
|
if (dir < 0 && pos == 0)
|
|
dir = 1;
|
|
|
|
if (pos + dir <= max_pos) {
|
|
/* Each bit of port 0 has a LED. */
|
|
set_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT));
|
|
pos += dir;
|
|
clear_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT));
|
|
}
|
|
}
|
|
|
|
counter = 0;
|
|
}
|
|
}
|