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hw/stellaris: Add support for RCC2 register

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Add support for the RCC2 register on Fury class devices.
Based on a patch by Vijay Kumar.

Signed-off-by: Engin AYDOGAN <engin@bzzzt.biz>
[Peter Maydell: fixed comment typos, minor cleanup of unreachable code]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Engin AYDOGAN 2011-08-03 22:15:23 +01:00 committed by Peter Maydell
parent b3aaff11ec
commit dc804ab776
1 changed files with 68 additions and 4 deletions
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72
hw/stellaris.c
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@ -332,6 +332,7 @@ typedef struct {
uint32_t int_mask;
uint32_t resc;
uint32_t rcc;
uint32_t rcc2;
uint32_t rcgc[3];
uint32_t scgc[3];
uint32_t dcgc[3];
@ -386,6 +387,32 @@ static uint32_t pllcfg_fury[16] = {
0xb11c /* 8.192 Mhz */
};
#define DID0_VER_MASK 0x70000000
#define DID0_VER_0 0x00000000
#define DID0_VER_1 0x10000000
#define DID0_CLASS_MASK 0x00FF0000
#define DID0_CLASS_SANDSTORM 0x00000000
#define DID0_CLASS_FURY 0x00010000
static int ssys_board_class(const ssys_state *s)
{
uint32_t did0 = s->board->did0;
switch (did0 & DID0_VER_MASK) {
case DID0_VER_0:
return DID0_CLASS_SANDSTORM;
case DID0_VER_1:
switch (did0 & DID0_CLASS_MASK) {
case DID0_CLASS_SANDSTORM:
case DID0_CLASS_FURY:
return did0 & DID0_CLASS_MASK;
}
/* for unknown classes, fall through */
default:
hw_error("ssys_board_class: Unknown class 0x%08x\n", did0);
}
}
static uint32_t ssys_read(void *opaque, target_phys_addr_t offset)
{
ssys_state *s = (ssys_state *)opaque;
@ -429,12 +456,18 @@ static uint32_t ssys_read(void *opaque, target_phys_addr_t offset)
{
int xtal;
xtal = (s->rcc >> 6) & 0xf;
if (s->board->did0 & (1 << 16)) {
switch (ssys_board_class(s)) {
case DID0_CLASS_FURY:
return pllcfg_fury[xtal];
} else {
case DID0_CLASS_SANDSTORM:
return pllcfg_sandstorm[xtal];
default:
hw_error("ssys_read: Unhandled class for PLLCFG read.\n");
return 0;
}
}
case 0x070: /* RCC2 */
return s->rcc2;
case 0x100: /* RCGC0 */
return s->rcgc[0];
case 0x104: /* RCGC1 */
@ -467,9 +500,21 @@ static uint32_t ssys_read(void *opaque, target_phys_addr_t offset)
}
}
static bool ssys_use_rcc2(ssys_state *s)
{
return (s->rcc2 >> 31) & 0x1;
}
/*
* Caculate the sys. clock period in ms.
*/
static void ssys_calculate_system_clock(ssys_state *s)
{
system_clock_scale = 5 * (((s->rcc >> 23) & 0xf) + 1);
if (ssys_use_rcc2(s)) {
system_clock_scale = 5 * (((s->rcc2 >> 23) & 0x3f) + 1);
} else {
system_clock_scale = 5 * (((s->rcc >> 23) & 0xf) + 1);
}
}
static void ssys_write(void *opaque, target_phys_addr_t offset, uint32_t value)
@ -505,6 +550,18 @@ static void ssys_write(void *opaque, target_phys_addr_t offset, uint32_t value)
s->rcc = value;
ssys_calculate_system_clock(s);
break;
case 0x070: /* RCC2 */
if (ssys_board_class(s) == DID0_CLASS_SANDSTORM) {
break;
}
if ((s->rcc2 & (1 << 13)) != 0 && (value & (1 << 13)) == 0) {
/* PLL enable. */
s->int_status |= (1 << 6);
}
s->rcc2 = value;
ssys_calculate_system_clock(s);
break;
case 0x100: /* RCGC0 */
s->rcgc[0] = value;
break;
@ -562,6 +619,12 @@ static void ssys_reset(void *opaque)
s->pborctl = 0x7ffd;
s->rcc = 0x078e3ac0;
if (ssys_board_class(s) == DID0_CLASS_SANDSTORM) {
s->rcc2 = 0;
} else {
s->rcc2 = 0x07802810;
}
s->rcgc[0] = 1;
s->scgc[0] = 1;
s->dcgc[0] = 1;
@ -578,7 +641,7 @@ static int stellaris_sys_post_load(void *opaque, int version_id)
static const VMStateDescription vmstate_stellaris_sys = {
.name = "stellaris_sys",
.version_id = 1,
.version_id = 2,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.post_load = stellaris_sys_post_load,
@ -589,6 +652,7 @@ static const VMStateDescription vmstate_stellaris_sys = {
VMSTATE_UINT32(int_status, ssys_state),
VMSTATE_UINT32(resc, ssys_state),
VMSTATE_UINT32(rcc, ssys_state),
VMSTATE_UINT32_V(rcc2, ssys_state, 2),
VMSTATE_UINT32_ARRAY(rcgc, ssys_state, 3),
VMSTATE_UINT32_ARRAY(scgc, ssys_state, 3),
VMSTATE_UINT32_ARRAY(dcgc, ssys_state, 3),