[4/4] watchdog/aspeed: Fix AST2600 frequency behaviour

The AST2600 control register sneakily changed the meaning of bit 4
without anyone noticing. It no longer controls the 1MHz vs APB clock
select, and instead always runs at 1MHz.

The AST2500 was always 1MHz too, but it retained bit 4, making it read
only. We can model both using the same fixed 1MHz calculation.

Fixes: ea29711f467f ("watchdog/aspeed: Fix AST2600 control reg behaviour")
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 hw/watchdog/wdt_aspeed.c         | 21 +++++++++++++++++----
 include/hw/watchdog/wdt_aspeed.h |  1 +
 2 files changed, 18 insertions(+), 4 deletions(-)

On 12/11/2019 07:40, Joel Stanley wrote:
> The AST2600 control register sneakily changed the meaning of bit 4
> without anyone noticing. It no longer controls the 1MHz vs APB clock
> select, and instead always runs at 1MHz.
> 
> The AST2500 was always 1MHz too, but it retained bit 4, making it read
> only. We can model both using the same fixed 1MHz calculation.
> 
> Fixes: ea29711f467f ("watchdog/aspeed: Fix AST2600 control reg behaviour")

which commit is that ^ ? Did you mean :

Fixes: 6b2b2a703cad ("hw: wdt_aspeed: Add AST2600 support")

> Signed-off-by: Joel Stanley <joel@jms.id.au>

Reviewed-by: Cédric Le Goater <clg@kaod.org>

C.

> ---
>  hw/watchdog/wdt_aspeed.c         | 21 +++++++++++++++++----
>  include/hw/watchdog/wdt_aspeed.h |  1 +
>  2 files changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/watchdog/wdt_aspeed.c b/hw/watchdog/wdt_aspeed.c
> index 5697ed83325a..f43a3bc88976 100644
> --- a/hw/watchdog/wdt_aspeed.c
> +++ b/hw/watchdog/wdt_aspeed.c
> @@ -93,11 +93,11 @@ static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size)
>  
>  }
>  
> -static void aspeed_wdt_reload(AspeedWDTState *s, bool pclk)
> +static void aspeed_wdt_reload(AspeedWDTState *s)
>  {
>      uint64_t reload;
>  
> -    if (pclk) {
> +    if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) {
>          reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND,
>                            s->pclk_freq);
>      } else {
> @@ -109,6 +109,16 @@ static void aspeed_wdt_reload(AspeedWDTState *s, bool pclk)
>      }
>  }
>  
> +static void aspeed_wdt_reload_1mhz(AspeedWDTState *s)
> +{
> +    uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;
> +
> +    if (aspeed_wdt_is_enabled(s)) {
> +        timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
> +    }
> +}
> +
> +
>  static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data,
>                               unsigned size)
>  {
> @@ -130,13 +140,13 @@ static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data,
>      case WDT_RESTART:
>          if ((data & 0xFFFF) == WDT_RESTART_MAGIC) {
>              s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE];
> -            aspeed_wdt_reload(s, !(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK));
> +            awc->wdt_reload(s);
>          }
>          break;
>      case WDT_CTRL:
>          if (enable && !aspeed_wdt_is_enabled(s)) {
>              s->regs[WDT_CTRL] = data;
> -            aspeed_wdt_reload(s, !(data & WDT_CTRL_1MHZ_CLK));
> +            awc->wdt_reload(s);
>          } else if (!enable && aspeed_wdt_is_enabled(s)) {
>              s->regs[WDT_CTRL] = data;
>              timer_del(s->timer);
> @@ -283,6 +293,7 @@ static void aspeed_2400_wdt_class_init(ObjectClass *klass, void *data)
>      awc->offset = 0x20;
>      awc->ext_pulse_width_mask = 0xff;
>      awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
> +    awc->wdt_reload = aspeed_wdt_reload;
>  }
>  
>  static const TypeInfo aspeed_2400_wdt_info = {
> @@ -317,6 +328,7 @@ static void aspeed_2500_wdt_class_init(ObjectClass *klass, void *data)
>      awc->ext_pulse_width_mask = 0xfffff;
>      awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
>      awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
> +    awc->wdt_reload = aspeed_wdt_reload_1mhz;
>  }
>  
>  static const TypeInfo aspeed_2500_wdt_info = {
> @@ -336,6 +348,7 @@ static void aspeed_2600_wdt_class_init(ObjectClass *klass, void *data)
>      awc->ext_pulse_width_mask = 0xfffff; /* TODO */
>      awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1;
>      awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
> +    awc->wdt_reload = aspeed_wdt_reload_1mhz;
>  }
>  
>  static const TypeInfo aspeed_2600_wdt_info = {
> diff --git a/include/hw/watchdog/wdt_aspeed.h b/include/hw/watchdog/wdt_aspeed.h
> index dfedd7662dd1..819c22993a6e 100644
> --- a/include/hw/watchdog/wdt_aspeed.h
> +++ b/include/hw/watchdog/wdt_aspeed.h
> @@ -47,6 +47,7 @@ typedef struct AspeedWDTClass {
>      uint32_t ext_pulse_width_mask;
>      uint32_t reset_ctrl_reg;
>      void (*reset_pulse)(AspeedWDTState *s, uint32_t property);
> +    void (*wdt_reload)(AspeedWDTState *s);
>  }  AspeedWDTClass;
>  
>  #endif /* WDT_ASPEED_H */
>

On Tue, 12 Nov 2019 at 07:56, Cédric Le Goater <clg@kaod.org> wrote:
>
> On 12/11/2019 07:40, Joel Stanley wrote:
> > The AST2600 control register sneakily changed the meaning of bit 4
> > without anyone noticing. It no longer controls the 1MHz vs APB clock
> > select, and instead always runs at 1MHz.
> >
> > The AST2500 was always 1MHz too, but it retained bit 4, making it read
> > only. We can model both using the same fixed 1MHz calculation.
> >
> > Fixes: ea29711f467f ("watchdog/aspeed: Fix AST2600 control reg behaviour")
>
> which commit is that ^ ? Did you mean :
>
> Fixes: 6b2b2a703cad ("hw: wdt_aspeed: Add AST2600 support")

Yes. Thanks for catching that.