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hw/integratorcp: Fix bugs in writes to CM_CTRL system register

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Fix a number of bugs in the implementation of writes to the CM_CTRL
system register:
 * write to cm_ctrl, not cm_init !
 * an '&' vs '^' typo meant we would write the inverse of the bits
 * handling the LED via printf() meant we spew lots of output
   to stdout when Linux uses the LED as a heartbeat indicator
 * we would hw_error() if a reset was requested rather than
   actually resetting

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Peter Maydell 2011-09-12 15:43:31 +01:00 committed by Anthony Liguori
parent f44cc4852a
commit df3f457b4b
1 changed files with 11 additions and 5 deletions
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16
hw/integratorcp.c
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@ -14,6 +14,7 @@
#include "arm-misc.h"
#include "net.h"
#include "exec-memory.h"
#include "sysemu.h"
typedef struct {
SysBusDevice busdev;
@ -126,15 +127,20 @@ static void integratorcm_do_remap(integratorcm_state *s, int flash)
static void integratorcm_set_ctrl(integratorcm_state *s, uint32_t value)
{
if (value & 8) {
hw_error("Board reset\n");
qemu_system_reset_request();
}
if ((s->cm_init ^ value) & 4) {
if ((s->cm_ctrl ^ value) & 4) {
integratorcm_do_remap(s, (value & 4) == 0);
}
if ((s->cm_init ^ value) & 1) {
printf("Green LED %s\n", (value & 1) ? "on" : "off");
if ((s->cm_ctrl ^ value) & 1) {
/* (value & 1) != 0 means the green "MISC LED" is lit.
* We don't have any nice place to display LEDs. printf is a bad
* idea because Linux uses the LED as a heartbeat and the output
* will swamp anything else on the terminal.
*/
}
s->cm_init = (s->cm_init & ~ 5) | (value ^ 5);
/* Note that the RESET bit [3] always reads as zero */
s->cm_ctrl = (s->cm_ctrl & ~5) | (value & 5);
}
static void integratorcm_update(integratorcm_state *s)