126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PROM interface routines.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <asm/bootinfo.h>
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#include <asm/lasat/lasat.h>
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#include <asm/cpu.h>
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#include "at93c.h"
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#include <asm/lasat/eeprom.h>
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#include "prom.h"
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#define RESET_VECTOR 0xbfc00000
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#define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
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#define PROM_DISPLAY_ADDR PROM_JUMP_TABLE_ENTRY(0)
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#define PROM_PUTC_ADDR PROM_JUMP_TABLE_ENTRY(1)
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#define PROM_MONITOR_ADDR PROM_JUMP_TABLE_ENTRY(2)
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static void null_prom_display(const char *string, int pos, int clear)
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{
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}
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static void null_prom_monitor(void)
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{
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}
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static void null_prom_putc(char c)
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{
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}
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/* these are functions provided by the bootloader */
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static void (*__prom_putc)(char c) = null_prom_putc;
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void prom_putchar(char c)
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{
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__prom_putc(c);
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}
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void (*prom_display)(const char *string, int pos, int clear) =
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null_prom_display;
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void (*prom_monitor)(void) = null_prom_monitor;
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unsigned int lasat_ndelay_divider;
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static void setup_prom_vectors(void)
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{
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u32 version = *(u32 *)(RESET_VECTOR + 0x90);
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if (version >= 307) {
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prom_display = (void *)PROM_DISPLAY_ADDR;
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__prom_putc = (void *)PROM_PUTC_ADDR;
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prom_monitor = (void *)PROM_MONITOR_ADDR;
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}
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printk(KERN_DEBUG "prom vectors set up\n");
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}
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static struct at93c_defs at93c_defs[N_MACHTYPES] = {
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{
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.reg = (void *)AT93C_REG_100,
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.rdata_reg = (void *)AT93C_RDATA_REG_100,
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.rdata_shift = AT93C_RDATA_SHIFT_100,
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.wdata_shift = AT93C_WDATA_SHIFT_100,
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.cs = AT93C_CS_M_100,
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.clk = AT93C_CLK_M_100
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}, {
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.reg = (void *)AT93C_REG_200,
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.rdata_reg = (void *)AT93C_RDATA_REG_200,
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.rdata_shift = AT93C_RDATA_SHIFT_200,
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.wdata_shift = AT93C_WDATA_SHIFT_200,
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.cs = AT93C_CS_M_200,
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.clk = AT93C_CLK_M_200
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},
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};
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void __init prom_init(void)
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{
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int argc = fw_arg0;
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char **argv = (char **) fw_arg1;
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setup_prom_vectors();
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if (IS_LASAT_200()) {
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printk(KERN_INFO "LASAT 200 board\n");
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lasat_ndelay_divider = LASAT_200_DIVIDER;
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at93c = &at93c_defs[1];
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} else {
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printk(KERN_INFO "LASAT 100 board\n");
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lasat_ndelay_divider = LASAT_100_DIVIDER;
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at93c = &at93c_defs[0];
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}
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lasat_init_board_info(); /* Read info from EEPROM */
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/* Get the command line */
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if (argc > 0) {
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strncpy(arcs_cmdline, argv[0], COMMAND_LINE_SIZE-1);
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arcs_cmdline[COMMAND_LINE_SIZE-1] = '\0';
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}
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/* Set the I/O base address */
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set_io_port_base(KSEG1);
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/* Set memory regions */
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ioport_resource.start = 0;
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ioport_resource.end = 0xffffffff; /* Wrong, fixme. */
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add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
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}
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void __init prom_free_prom_memory(void)
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{
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}
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const char *get_system_type(void)
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{
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return lasat_board_info.li_bmstr;
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}
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