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8d5f07fa3b
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1098 c046a42c-6fe2-441c-8c8c-71466251a162
392 lines
9.8 KiB
C
392 lines
9.8 KiB
C
/*
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* QEMU M48T08 NVRAM emulation for Sparc platform
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*
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* Copyright (c) 2003-2004 Jocelyn Mayer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h"
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#include "m48t08.h"
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//#define DEBUG_NVRAM
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#if defined(DEBUG_NVRAM)
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#define NVRAM_PRINTF(fmt, args...) do { printf(fmt , ##args); } while (0)
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#else
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#define NVRAM_PRINTF(fmt, args...) do { } while (0)
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#endif
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#define NVRAM_MAX_MEM 0xfff0
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struct m48t08_t {
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/* Hardware parameters */
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int mem_index;
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uint32_t mem_base;
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uint16_t size;
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/* RTC management */
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time_t time_offset;
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time_t stop_time;
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/* NVRAM storage */
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uint8_t lock;
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uint16_t addr;
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uint8_t *buffer;
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};
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/* Fake timer functions */
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/* Generic helpers for BCD */
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static inline uint8_t toBCD (uint8_t value)
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{
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return (((value / 10) % 10) << 4) | (value % 10);
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}
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static inline uint8_t fromBCD (uint8_t BCD)
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{
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return ((BCD >> 4) * 10) + (BCD & 0x0F);
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}
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/* RTC management helpers */
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static void get_time (m48t08_t *NVRAM, struct tm *tm)
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{
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time_t t;
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t = time(NULL) + NVRAM->time_offset;
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#ifdef _WIN32
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memcpy(tm,localtime(&t),sizeof(*tm));
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#else
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localtime_r (&t, tm) ;
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#endif
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}
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static void set_time (m48t08_t *NVRAM, struct tm *tm)
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{
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time_t now, new_time;
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new_time = mktime(tm);
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now = time(NULL);
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NVRAM->time_offset = new_time - now;
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}
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/* Direct access to NVRAM */
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void m48t08_write (m48t08_t *NVRAM, uint32_t val)
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{
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struct tm tm;
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int tmp;
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if (NVRAM->addr > NVRAM_MAX_MEM && NVRAM->addr < 0x2000)
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NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, NVRAM->addr, val);
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switch (NVRAM->addr) {
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case 0x1FF8:
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/* control */
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NVRAM->buffer[0x1FF8] = (val & ~0xA0) | 0x90;
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break;
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case 0x1FF9:
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/* seconds (BCD) */
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tmp = fromBCD(val & 0x7F);
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if (tmp >= 0 && tmp <= 59) {
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get_time(NVRAM, &tm);
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tm.tm_sec = tmp;
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set_time(NVRAM, &tm);
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}
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if ((val & 0x80) ^ (NVRAM->buffer[0x1FF9] & 0x80)) {
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if (val & 0x80) {
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NVRAM->stop_time = time(NULL);
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} else {
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NVRAM->time_offset += NVRAM->stop_time - time(NULL);
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NVRAM->stop_time = 0;
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}
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}
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NVRAM->buffer[0x1FF9] = val & 0x80;
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break;
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case 0x1FFA:
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/* minutes (BCD) */
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tmp = fromBCD(val & 0x7F);
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if (tmp >= 0 && tmp <= 59) {
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get_time(NVRAM, &tm);
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tm.tm_min = tmp;
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set_time(NVRAM, &tm);
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}
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break;
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case 0x1FFB:
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/* hours (BCD) */
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tmp = fromBCD(val & 0x3F);
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if (tmp >= 0 && tmp <= 23) {
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get_time(NVRAM, &tm);
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tm.tm_hour = tmp;
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set_time(NVRAM, &tm);
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}
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break;
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case 0x1FFC:
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/* day of the week / century */
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tmp = fromBCD(val & 0x07);
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get_time(NVRAM, &tm);
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tm.tm_wday = tmp;
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set_time(NVRAM, &tm);
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NVRAM->buffer[0x1FFC] = val & 0x40;
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break;
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case 0x1FFD:
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/* date */
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tmp = fromBCD(val & 0x1F);
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if (tmp != 0) {
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get_time(NVRAM, &tm);
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tm.tm_mday = tmp;
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set_time(NVRAM, &tm);
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}
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break;
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case 0x1FFE:
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/* month */
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tmp = fromBCD(val & 0x1F);
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if (tmp >= 1 && tmp <= 12) {
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get_time(NVRAM, &tm);
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tm.tm_mon = tmp - 1;
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set_time(NVRAM, &tm);
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}
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break;
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case 0x1FFF:
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/* year */
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tmp = fromBCD(val);
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if (tmp >= 0 && tmp <= 99) {
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get_time(NVRAM, &tm);
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tm.tm_year = fromBCD(val);
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set_time(NVRAM, &tm);
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}
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break;
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default:
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/* Check lock registers state */
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if (NVRAM->addr >= 0x20 && NVRAM->addr <= 0x2F && (NVRAM->lock & 1))
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break;
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if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2))
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break;
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if (NVRAM->addr < NVRAM_MAX_MEM ||
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(NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
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NVRAM->buffer[NVRAM->addr] = val & 0xFF;
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}
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break;
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}
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}
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uint32_t m48t08_read (m48t08_t *NVRAM)
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{
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struct tm tm;
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uint32_t retval = 0xFF;
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switch (NVRAM->addr) {
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case 0x1FF8:
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/* control */
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goto do_read;
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case 0x1FF9:
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/* seconds (BCD) */
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get_time(NVRAM, &tm);
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retval = (NVRAM->buffer[0x1FF9] & 0x80) | toBCD(tm.tm_sec);
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break;
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case 0x1FFA:
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/* minutes (BCD) */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_min);
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break;
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case 0x1FFB:
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/* hours (BCD) */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_hour);
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break;
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case 0x1FFC:
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/* day of the week / century */
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get_time(NVRAM, &tm);
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retval = NVRAM->buffer[0x1FFC] | tm.tm_wday;
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break;
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case 0x1FFD:
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/* date */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_mday);
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break;
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case 0x1FFE:
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/* month */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_mon + 1);
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break;
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case 0x1FFF:
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/* year */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_year);
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break;
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default:
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/* Check lock registers state */
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if (NVRAM->addr >= 0x20 && NVRAM->addr <= 0x2F && (NVRAM->lock & 1))
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break;
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if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2))
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break;
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if (NVRAM->addr < NVRAM_MAX_MEM ||
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(NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
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do_read:
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retval = NVRAM->buffer[NVRAM->addr];
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}
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break;
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}
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if (NVRAM->addr > NVRAM_MAX_MEM + 1 && NVRAM->addr < 0x2000)
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NVRAM_PRINTF("0x%08x <= 0x%08x\n", NVRAM->addr, retval);
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return retval;
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}
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void m48t08_set_addr (m48t08_t *NVRAM, uint32_t addr)
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{
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NVRAM->addr = addr;
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}
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void m48t08_toggle_lock (m48t08_t *NVRAM, int lock)
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{
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NVRAM->lock ^= 1 << lock;
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}
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static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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m48t08_t *NVRAM = opaque;
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addr -= NVRAM->mem_base;
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if (addr < NVRAM_MAX_MEM)
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NVRAM->buffer[addr] = value;
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}
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static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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m48t08_t *NVRAM = opaque;
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addr -= NVRAM->mem_base;
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if (addr < NVRAM_MAX_MEM) {
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NVRAM->buffer[addr] = value >> 8;
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NVRAM->buffer[addr + 1] = value;
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}
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}
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static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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m48t08_t *NVRAM = opaque;
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addr -= NVRAM->mem_base;
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if (addr < NVRAM_MAX_MEM) {
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NVRAM->buffer[addr] = value >> 24;
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NVRAM->buffer[addr + 1] = value >> 16;
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NVRAM->buffer[addr + 2] = value >> 8;
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NVRAM->buffer[addr + 3] = value;
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}
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}
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static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
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{
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m48t08_t *NVRAM = opaque;
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uint32_t retval = 0;
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addr -= NVRAM->mem_base;
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if (addr < NVRAM_MAX_MEM)
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retval = NVRAM->buffer[addr];
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return retval;
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}
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static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr)
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{
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m48t08_t *NVRAM = opaque;
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uint32_t retval = 0;
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addr -= NVRAM->mem_base;
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if (addr < NVRAM_MAX_MEM) {
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retval = NVRAM->buffer[addr] << 8;
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retval |= NVRAM->buffer[addr + 1];
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}
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return retval;
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}
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static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
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{
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m48t08_t *NVRAM = opaque;
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uint32_t retval = 0;
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addr -= NVRAM->mem_base;
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if (addr < NVRAM_MAX_MEM) {
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retval = NVRAM->buffer[addr] << 24;
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retval |= NVRAM->buffer[addr + 1] << 16;
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retval |= NVRAM->buffer[addr + 2] << 8;
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retval |= NVRAM->buffer[addr + 3];
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}
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return retval;
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}
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static CPUWriteMemoryFunc *nvram_write[] = {
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&nvram_writeb,
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&nvram_writew,
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&nvram_writel,
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};
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static CPUReadMemoryFunc *nvram_read[] = {
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&nvram_readb,
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&nvram_readw,
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&nvram_readl,
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};
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/* Initialisation routine */
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m48t08_t *m48t08_init(uint32_t mem_base, uint16_t size, uint8_t *macaddr)
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{
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m48t08_t *s;
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int i;
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unsigned char tmp = 0;
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s = qemu_mallocz(sizeof(m48t08_t));
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if (!s)
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return NULL;
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s->buffer = qemu_mallocz(size);
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if (!s->buffer) {
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qemu_free(s);
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return NULL;
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}
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s->size = size;
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s->mem_base = mem_base;
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s->addr = 0;
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if (mem_base != 0) {
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s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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cpu_register_physical_memory(mem_base, 0x4000, s->mem_index);
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}
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s->lock = 0;
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i = 0x1fd8;
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s->buffer[i++] = 0x01;
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s->buffer[i++] = 0x80; /* Sun4m OBP */
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memcpy(&s->buffer[i], macaddr, 6);
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/* Calculate checksum */
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for (i = 0x1fd8; i < 0x1fe7; i++) {
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tmp ^= s->buffer[i];
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}
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s->buffer[0x1fe7] = tmp;
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return s;
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}
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#if 0
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struct idprom
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{
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unsigned char id_format; /* Format identifier (always 0x01) */
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unsigned char id_machtype; /* Machine type */
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unsigned char id_ethaddr[6]; /* Hardware ethernet address */
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long id_date; /* Date of manufacture */
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unsigned int id_sernum:24; /* Unique serial number */
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unsigned char id_cksum; /* Checksum - xor of the data bytes */
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unsigned char reserved[16];
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};
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#endif
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