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Diffstat (limited to 'arch/v850/kernel/as85ep1.c')
| -rw-r--r-- | arch/v850/kernel/as85ep1.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/arch/v850/kernel/as85ep1.c b/arch/v850/kernel/as85ep1.c new file mode 100644 index 000000000000..4059b1df11b5 --- /dev/null +++ b/arch/v850/kernel/as85ep1.c @@ -0,0 +1,240 @@ +/* + * 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. */ +} + +EXPORT_SYMBOL(machine_restart); + +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"); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); + +/* 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; + } +} |