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milkymist-sysctl: support for new core version 

The new version introduces the following new registers:
 - SoC clock frequency: read-only of system clock used on the SoC
 - debug scratchpad: 8 bit scratchpad register
 - debug write lock: write once register, without any function on QEMU

Signed-off-by: Michael Walle <michael@walle.cc>
This commit is contained in:
Michael Walle 2012-03-31 19:54:09 +02:00
parent de89fd2b88
commit 060544d30f
1 changed files with 17 additions and 9 deletions
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26
hw/milkymist-sysctl.c
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@ -1,7 +1,7 @@
/*
* QEMU model of the Milkymist System Controller.
*
* Copyright (c) 2010 Michael Walle <michael@walle.cc>
* Copyright (c) 2010-2012 Michael Walle <michael@walle.cc>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -39,20 +39,19 @@ enum {
};
enum {
R_GPIO_IN = 0,
R_GPIO_IN = 0,
R_GPIO_OUT,
R_GPIO_INTEN,
R_RESERVED0,
R_TIMER0_CONTROL,
R_TIMER0_CONTROL = 4,
R_TIMER0_COMPARE,
R_TIMER0_COUNTER,
R_RESERVED1,
R_TIMER1_CONTROL,
R_TIMER1_CONTROL = 8,
R_TIMER1_COMPARE,
R_TIMER1_COUNTER,
R_RESERVED2,
R_RESERVED3,
R_ICAP,
R_ICAP = 16,
R_DBG_SCRATCHPAD = 20,
R_DBG_WRITE_LOCK,
R_CLK_FREQUENCY = 29,
R_CAPABILITIES,
R_SYSTEM_ID,
R_MAX
@ -116,6 +115,9 @@ static uint64_t sysctl_read(void *opaque, target_phys_addr_t addr,
case R_TIMER1_CONTROL:
case R_TIMER1_COMPARE:
case R_ICAP:
case R_DBG_SCRATCHPAD:
case R_DBG_WRITE_LOCK:
case R_CLK_FREQUENCY:
case R_CAPABILITIES:
case R_SYSTEM_ID:
r = s->regs[addr];
@ -145,6 +147,7 @@ static void sysctl_write(void *opaque, target_phys_addr_t addr, uint64_t value,
case R_GPIO_INTEN:
case R_TIMER0_COUNTER:
case R_TIMER1_COUNTER:
case R_DBG_SCRATCHPAD:
s->regs[addr] = value;
break;
case R_TIMER0_COMPARE:
@ -182,11 +185,15 @@ static void sysctl_write(void *opaque, target_phys_addr_t addr, uint64_t value,
case R_ICAP:
sysctl_icap_write(s, value);
break;
case R_DBG_WRITE_LOCK:
s->regs[addr] = 1;
break;
case R_SYSTEM_ID:
qemu_system_reset_request();
break;
case R_GPIO_IN:
case R_CLK_FREQUENCY:
case R_CAPABILITIES:
error_report("milkymist_sysctl: write to read-only register 0x"
TARGET_FMT_plx, addr << 2);
@ -253,6 +260,7 @@ static void milkymist_sysctl_reset(DeviceState *d)
/* defaults */
s->regs[R_ICAP] = ICAP_READY;
s->regs[R_SYSTEM_ID] = s->systemid;
s->regs[R_CLK_FREQUENCY] = s->freq_hz;
s->regs[R_CAPABILITIES] = s->capabilities;
s->regs[R_GPIO_IN] = s->strappings;
}