/*
* arch/v850/kernel/anna.c -- Anna V850E2 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 0
static void anna_led_tick (void);
void __init mach_early_init (void)
{
ANNA_ILBEN = 0;
V850E2_CSC(0) = 0x402F;
V850E2_CSC(1) = 0x4000;
V850E2_BPC = 0;
V850E2_BSC = 0xAAAA;
V850E2_BEC = 0;
#if 0
V850E2_BHC = 0xFFFF; /* icache all memory, dcache all */
#else
V850E2_BHC = 0; /* cache no memory */
#endif
V850E2_BCT(0) = 0xB088;
V850E2_BCT(1) = 0x0008;
V850E2_DWC(0) = 0x0027;
V850E2_DWC(1) = 0;
V850E2_BCC = 0x0006;
V850E2_ASC = 0;
V850E2_LBS = 0x0089;
V850E2_SCR(3) = 0x21A9;
V850E2_RFS(3) = 0x8121;
v850e_intc_disable_irqs ();
}
void __init mach_setup (char **cmdline)
{
ANNA_PORT_PM (LEDS_PORT) = 0; /* Make all LED pins output pins. */
mach_tick = anna_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;
}
void __init mach_reserve_bootmem ()
{
/* The space between SRAM and SDRAM is filled with duplicate
images of SRAM. Prevent the kernel from using them. */
reserve_bootmem (SRAM_ADDR + SRAM_SIZE,
SDRAM_ADDR - (SRAM_ADDR + SRAM_SIZE));
}
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 },
{ "PIN", IRQ_INTP(0), IRQ_INTP_NUM, 1, 4 },
{ "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 },
{ "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 },
{ "DMA", IRQ_INTDMA(0), IRQ_INTDMA_NUM, 1, 2 },
{ "DMXER", IRQ_INTDMXER,1, 1, 2 },
{ "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. */
ANNA_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 anna_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud)
{
/* The Anna connects some general-purpose I/O pins on the CPU to
the RTS/CTS lines of UART 1's serial connection. I/O pins P07
and P37 are RTS and CTS respectively. */
if (chan == 1) {
ANNA_PORT_PM(0) &= ~0x80; /* P07 in output mode */
ANNA_PORT_PM(3) |= 0x80; /* P37 in input mode */
}
}
/* Minimum and maximum bounds for the moving upper LED boundary in the
clock tick display. We can't use the last bit because it's used for
UART0's CTS output. */
#define MIN_MAX_POS 0
#define MAX_MAX_POS 6
/* 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 anna_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. */
clear_bit (pos, &ANNA_PORT_IO(LEDS_PORT));
pos += dir;
set_bit (pos, &ANNA_PORT_IO(LEDS_PORT));
}
}
counter = 0;
}
}
