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hw/arm/stellaris: Implement watchdog timer

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Implement the watchdog timer for the stellaris boards.
This device is a close variant of the CMSDK APB watchdog
device, so we can model it by subclassing that device and
tweaking the behaviour of some of its registers.

Signed-off-by: Michel Heily <michelheily@gmail.com>
Reviewed-by: Peter Maydell <petser.maydell@linaro.org>
[PMM: rewrote commit message, fixed a few checkpatch nits,
 added comment giving the URL of the spec for the Stellaris
 variant of the watchdog device]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Michel Heily 2019-03-05 01:16:22 +02:00 • committed by Peter Maydell
parent 50a17297e2
commit 566528f823
3 changed files with 100 additions and 4 deletions
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22
hw/arm/stellaris.c
View file

@ -22,6 +22,7 @@
#include "sysemu/sysemu.h"
#include "hw/arm/armv7m.h"
#include "hw/char/pl011.h"
#include "hw/watchdog/cmsdk-apb-watchdog.h"
#include "hw/misc/unimp.h"
#include "cpu.h"
@ -1243,7 +1244,7 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
* Stellaris LM3S6965 Microcontroller Data Sheet (rev I)
* http://www.ti.com/lit/ds/symlink/lm3s6965.pdf
*
* 40000000 wdtimer (unimplemented)
* 40000000 wdtimer
* 40002000 i2c (unimplemented)
* 40004000 GPIO
* 40005000 GPIO
@ -1338,6 +1339,24 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
stellaris_sys_init(0x400fe000, qdev_get_gpio_in(nvic, 28),
board, nd_table[0].macaddr.a);
if (board->dc1 & (1 << 3)) { /* watchdog present */
dev = qdev_create(NULL, TYPE_LUMINARY_WATCHDOG);
/* system_clock_scale is valid now */
uint32_t mainclk = NANOSECONDS_PER_SECOND / system_clock_scale;
qdev_prop_set_uint32(dev, "wdogclk-frq", mainclk);
qdev_init_nofail(dev);
sysbus_mmio_map(SYS_BUS_DEVICE(dev),
0,
0x40000000u);
sysbus_connect_irq(SYS_BUS_DEVICE(dev),
0,
qdev_get_gpio_in(nvic, 18));
}
for (i = 0; i < 7; i++) {
if (board->dc4 & (1 << i)) {
gpio_dev[i] = sysbus_create_simple("pl061_luminary", gpio_addr[i],
@ -1431,7 +1450,6 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
/* Add dummy regions for the devices we don't implement yet,
* so guest accesses don't cause unlogged crashes.
*/
create_unimplemented_device("wdtimer", 0x40000000, 0x1000);
create_unimplemented_device("i2c-0", 0x40002000, 0x1000);
create_unimplemented_device("i2c-2", 0x40021000, 0x1000);
create_unimplemented_device("PWM", 0x40028000, 0x1000);