367 lines
10 KiB
C
367 lines
10 KiB
C
/*
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* QEMU model for the AXIS devboard 88.
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*
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* Copyright (c) 2009 Edgar E. Iglesias, Axis Communications AB.
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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 "sysbus.h"
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#include "net.h"
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#include "flash.h"
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#include "boards.h"
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#include "sysemu.h"
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#include "etraxfs.h"
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#define D(x)
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#define DNAND(x)
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struct nand_state_t
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{
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NANDFlashState *nand;
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unsigned int rdy:1;
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unsigned int ale:1;
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unsigned int cle:1;
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unsigned int ce:1;
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};
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static struct nand_state_t nand_state;
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static uint32_t nand_readl (void *opaque, target_phys_addr_t addr)
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{
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struct nand_state_t *s = opaque;
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uint32_t r;
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int rdy;
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r = nand_getio(s->nand);
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nand_getpins(s->nand, &rdy);
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s->rdy = rdy;
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DNAND(printf("%s addr=%x r=%x\n", __func__, addr, r));
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return r;
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}
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static void
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nand_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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struct nand_state_t *s = opaque;
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int rdy;
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DNAND(printf("%s addr=%x v=%x\n", __func__, addr, value));
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nand_setpins(s->nand, s->cle, s->ale, s->ce, 1, 0);
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nand_setio(s->nand, value);
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nand_getpins(s->nand, &rdy);
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s->rdy = rdy;
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}
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static CPUReadMemoryFunc *nand_read[] = {
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&nand_readl,
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&nand_readl,
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&nand_readl,
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};
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static CPUWriteMemoryFunc *nand_write[] = {
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&nand_writel,
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&nand_writel,
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&nand_writel,
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};
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struct tempsensor_t
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{
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unsigned int shiftreg;
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unsigned int count;
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enum {
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ST_OUT, ST_IN, ST_Z
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} state;
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uint16_t regs[3];
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};
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static void tempsensor_clkedge(struct tempsensor_t *s,
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unsigned int clk, unsigned int data_in)
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{
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D(printf("%s clk=%d state=%d sr=%x\n", __func__,
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clk, s->state, s->shiftreg));
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if (s->count == 0) {
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s->count = 16;
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s->state = ST_OUT;
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}
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switch (s->state) {
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case ST_OUT:
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/* Output reg is clocked at negedge. */
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if (!clk) {
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s->count--;
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s->shiftreg <<= 1;
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if (s->count == 0) {
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s->shiftreg = 0;
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s->state = ST_IN;
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s->count = 16;
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}
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}
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break;
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case ST_Z:
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if (clk) {
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s->count--;
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if (s->count == 0) {
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s->shiftreg = 0;
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s->state = ST_OUT;
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s->count = 16;
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}
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}
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break;
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case ST_IN:
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/* Indata is sampled at posedge. */
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if (clk) {
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s->count--;
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s->shiftreg <<= 1;
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s->shiftreg |= data_in & 1;
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if (s->count == 0) {
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D(printf("%s cfgreg=%x\n", __func__, s->shiftreg));
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s->regs[0] = s->shiftreg;
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s->state = ST_OUT;
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s->count = 16;
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if ((s->regs[0] & 0xff) == 0) {
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/* 25 degrees celcius. */
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s->shiftreg = 0x0b9f;
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} else if ((s->regs[0] & 0xff) == 0xff) {
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/* Sensor ID, 0x8100 LM70. */
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s->shiftreg = 0x8100;
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} else
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printf("Invalid tempsens state %x\n", s->regs[0]);
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}
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}
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break;
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}
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}
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#define RW_PA_DOUT 0x00
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#define R_PA_DIN 0x01
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#define RW_PA_OE 0x02
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#define RW_PD_DOUT 0x10
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#define R_PD_DIN 0x11
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#define RW_PD_OE 0x12
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static struct gpio_state_t
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{
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struct nand_state_t *nand;
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struct tempsensor_t tempsensor;
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uint32_t regs[0x5c / 4];
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} gpio_state;
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static uint32_t gpio_readl (void *opaque, target_phys_addr_t addr)
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{
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struct gpio_state_t *s = opaque;
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uint32_t r = 0;
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addr >>= 2;
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switch (addr)
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{
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case R_PA_DIN:
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r = s->regs[RW_PA_DOUT] & s->regs[RW_PA_OE];
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/* Encode pins from the nand. */
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r |= s->nand->rdy << 7;
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break;
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case R_PD_DIN:
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r = s->regs[RW_PD_DOUT] & s->regs[RW_PD_OE];
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/* Encode temp sensor pins. */
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r |= (!!(s->tempsensor.shiftreg & 0x10000)) << 4;
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break;
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default:
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r = s->regs[addr];
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break;
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}
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return r;
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D(printf("%s %x=%x\n", __func__, addr, r));
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}
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static void gpio_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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struct gpio_state_t *s = opaque;
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D(printf("%s %x=%x\n", __func__, addr, value));
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addr >>= 2;
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switch (addr)
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{
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case RW_PA_DOUT:
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/* Decode nand pins. */
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s->nand->ale = !!(value & (1 << 6));
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s->nand->cle = !!(value & (1 << 5));
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s->nand->ce = !!(value & (1 << 4));
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s->regs[addr] = value;
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break;
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case RW_PD_DOUT:
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/* Temp sensor clk. */
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if ((s->regs[addr] ^ value) & 2)
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tempsensor_clkedge(&s->tempsensor, !!(value & 2),
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!!(value & 16));
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s->regs[addr] = value;
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break;
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default:
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s->regs[addr] = value;
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break;
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}
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}
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static CPUReadMemoryFunc *gpio_read[] = {
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NULL, NULL,
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&gpio_readl,
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};
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static CPUWriteMemoryFunc *gpio_write[] = {
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NULL, NULL,
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&gpio_writel,
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};
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#define INTMEM_SIZE (128 * 1024)
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static uint32_t bootstrap_pc;
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static void main_cpu_reset(void *opaque)
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{
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CPUState *env = opaque;
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cpu_reset(env);
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env->pc = bootstrap_pc;
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}
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static
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void axisdev88_init (ram_addr_t ram_size,
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const char *boot_device,
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const char *kernel_filename, const char *kernel_cmdline,
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const char *initrd_filename, const char *cpu_model)
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{
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CPUState *env;
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qemu_irq *irq, *nmi;
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void *etraxfs_dmac;
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struct etraxfs_dma_client *eth[2] = {NULL, NULL};
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int kernel_size;
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int i;
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int nand_regs;
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int gpio_regs;
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ram_addr_t phys_ram;
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ram_addr_t phys_intmem;
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/* init CPUs */
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if (cpu_model == NULL) {
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cpu_model = "crisv32";
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}
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env = cpu_init(cpu_model);
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qemu_register_reset(main_cpu_reset, env);
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/* allocate RAM */
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phys_ram = qemu_ram_alloc(ram_size);
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cpu_register_physical_memory(0x40000000, ram_size, phys_ram | IO_MEM_RAM);
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/* The ETRAX-FS has 128Kb on chip ram, the docs refer to it as the
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internal memory. */
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phys_intmem = qemu_ram_alloc(INTMEM_SIZE);
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cpu_register_physical_memory(0x38000000, INTMEM_SIZE,
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phys_intmem | IO_MEM_RAM);
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/* Attach a NAND flash to CS1. */
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nand_state.nand = nand_init(NAND_MFR_STMICRO, 0x39);
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nand_regs = cpu_register_io_memory(0, nand_read, nand_write, &nand_state);
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cpu_register_physical_memory(0x10000000, 0x05000000, nand_regs);
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gpio_state.nand = &nand_state;
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gpio_regs = cpu_register_io_memory(0, gpio_read, gpio_write, &gpio_state);
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cpu_register_physical_memory(0x3001a000, 0x5c, gpio_regs);
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irq = etraxfs_pic_init(env, 0x3001c000);
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nmi = irq + 30;
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etraxfs_dmac = etraxfs_dmac_init(env, 0x30000000, 10);
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for (i = 0; i < 10; i++) {
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/* On ETRAX, odd numbered channels are inputs. */
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etraxfs_dmac_connect(etraxfs_dmac, i, irq + 7 + i, i & 1);
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}
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/* Add the two ethernet blocks. */
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eth[0] = etraxfs_eth_init(&nd_table[0], env, irq + 25, 0x30034000, 1);
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if (nb_nics > 1)
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eth[1] = etraxfs_eth_init(&nd_table[1], env,
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irq + 26, 0x30036000, 2);
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/* The DMA Connector block is missing, hardwire things for now. */
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etraxfs_dmac_connect_client(etraxfs_dmac, 0, eth[0]);
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etraxfs_dmac_connect_client(etraxfs_dmac, 1, eth[0] + 1);
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if (eth[1]) {
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etraxfs_dmac_connect_client(etraxfs_dmac, 6, eth[1]);
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etraxfs_dmac_connect_client(etraxfs_dmac, 7, eth[1] + 1);
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}
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/* 2 timers. */
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sysbus_create_varargs("etraxfs,timer", 0x3001e000, irq[0x1b], nmi[1], NULL);
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sysbus_create_varargs("etraxfs,timer", 0x3005e000, irq[0x1b], nmi[1], NULL);
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for (i = 0; i < 4; i++) {
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sysbus_create_simple("etraxfs,serial", 0x30026000 + i * 0x2000,
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irq[0x14 + i]);
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}
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if (kernel_filename) {
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uint64_t entry, high;
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int kcmdline_len;
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/* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis
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devboard SDK. */
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kernel_size = load_elf(kernel_filename, -0x80000000LL,
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&entry, NULL, &high);
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bootstrap_pc = entry;
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if (kernel_size < 0) {
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/* Takes a kimage from the axis devboard SDK. */
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kernel_size = load_image_targphys(kernel_filename, 0x40004000,
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ram_size);
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bootstrap_pc = 0x40004000;
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env->regs[9] = 0x40004000 + kernel_size;
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}
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env->regs[8] = 0x56902387; /* RAM init magic. */
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if (kernel_cmdline && (kcmdline_len = strlen(kernel_cmdline))) {
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if (kcmdline_len > 256) {
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fprintf(stderr, "Too long CRIS kernel cmdline (max 256)\n");
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exit(1);
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}
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/* Let the kernel know we are modifying the cmdline. */
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env->regs[10] = 0x87109563;
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env->regs[11] = 0x40000000;
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pstrcpy_targphys(env->regs[11], 256, kernel_cmdline);
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}
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}
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env->pc = bootstrap_pc;
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printf ("pc =%x\n", env->pc);
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printf ("ram size =%ld\n", ram_size);
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}
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QEMUMachine axisdev88_machine = {
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.name = "axis-dev88",
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.desc = "AXIS devboard 88",
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.init = axisdev88_init,
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};
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