> From: Jeremie Courreges-Anglas <j...@wxcvbn.org>
> Date: Sat, 01 Oct 2022 18:36:35 +0200
>
> On Thu, Aug 18 2022, Jeremie Courreges-Anglas <j...@wxcvbn.org> wrote:
> > Some time ago I wanted to get a clean poweroff from the power button on
> > my Unmatched, so that I don't get fsck at reboot the morning after
> > someone sleeps in the room where the machine lives. kettenis kindly
> > provided sfgpio(4) to get interrupts working on dapmic(4) instead of my
> > initial hack that used polling.
> >
> > One issue I struggled with for a bit is that masking irqs also masks the
> > wake-up events, particularly the events we use for dapmic_reset().
> > With the diff below most interrupt events are masked off during runtime,
> > until we're shutting down/rebooting. Maybe this is too paranoid and
> > I should let more events go through the intr handler, eg for wake-up
> > events that I don't envision yet? (I would love to get wake on lan
> > support in cad(4) but my attempts led nowhere so far.)
> >
> > Also interesting, the fault register needs to be cleared at boot, else
> > the interrupt will keep triggering after eg a hard button-driven poweroff.
> > We could log the faults found in FAULT_LOG at boot time to know why the
> > machine has stopped. But I'm more concerned about what to do if we get
> > a fault at runtime (see the XXX). When I tried to disestablish the
> > interrupt handler with fdt_intr_disestablish(sc->sc_ih) from
> > dapmic_reset(), I got a fault. Maybe something worth investigating.
>
> The FAULT_LOG register handling seems appropriate after reading entry
> 6.2 in:
>
>
> https://www.renesas.com/eu/en/document/apn/shared-irq-line-considerations-pm-059
>
> I wish I had read this document earlier. :)
>
> > The code below is based off da9063_datasheet_2v2.pdf. I don't know of
> > other machines we run on that use this controller, the only entry in
> > dmesglog is matthieu's Unmatched machine.
> >
> > Tests, input and oks welcome.
>
> In the case where my hifive unmatched lives, I have wired both the
> shutdown and the reset buttons. Yesterday I tried to see whether the
> reset button could be handled as a clean reboot, but looking at the
> hifive unmatched board schematics it seems that the PMIC has no control
> over it (even if tweaking nRES_MODE). So the diff stands for scrutiny.
> I would like input and maybe oks to get this in. ;)
Finally managed to get this tested. It works for my chassis as well!
A few nits below. With those fixed, ok kettenis@
> Index: dev/fdt/dapmic.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/fdt/dapmic.c,v
> retrieving revision 1.2
> diff -u -p -r1.2 dapmic.c
> --- dev/fdt/dapmic.c 6 Apr 2022 18:59:28 -0000 1.2
> +++ dev/fdt/dapmic.c 17 Aug 2022 21:59:57 -0000
> @@ -19,6 +19,9 @@
> #include <sys/systm.h>
> #include <sys/device.h>
> #include <sys/malloc.h>
> +#include <sys/task.h>
> +#include <sys/proc.h>
> +#include <sys/signalvar.h>
>
> #include <dev/ofw/openfirm.h>
> #include <dev/ofw/ofw_regulator.h>
> @@ -28,11 +31,31 @@
>
> #include <dev/clock_subr.h>
>
> +#include <machine/fdt.h>
> +
> extern void (*cpuresetfn)(void);
> extern void (*powerdownfn)(void);
>
> /* Registers */
> +#define FAULT_LOG 0x05
> #define EVENT_A 0x06
> +#define EVENT_A_EVENTS_D (1 << 7)
> +#define EVENT_A_EVENTS_C (1 << 6)
> +#define EVENT_A_EVENTS_B (1 << 5)
> +#define EVENT_A_E_nONKEY (1 << 0)
> +#define EVENT_B 0x07
> +#define EVENT_C 0x08
> +#define EVENT_D 0x09
> +#define IRQ_MASK_A 0x0a
> +#define IRQ_MASK_A_M_RESERVED ((1 << 7) | (1 << 6) | (1 << 5))
> +#define IRQ_MASK_A_M_SEQ_RDY (1 << 4)
> +#define IRQ_MASK_A_M_ADC_RDY (1 << 3)
> +#define IRQ_MASK_A_M_TICK (1 << 2)
> +#define IRQ_MASK_A_M_ALARM (1 << 1)
> +#define IRQ_MASK_A_M_nONKEY (1 << 0)
> +#define IRQ_MASK_B 0x0b
> +#define IRQ_MASK_C 0x0c
> +#define IRQ_MASK_D 0x0d
> #define CONTROL_F 0x13
> #define CONTROL_F_WAKE_UP (1 << 2)
> #define CONTROL_F_SHUTDOWN (1 << 1)
> @@ -55,11 +78,20 @@ extern void (*powerdownfn)(void);
> #define ALARM_Y 0x4b
> #define ALARM_Y_TICK_ON (1 << 7)
>
> +#ifdef DAPMIC_DEBUG
> +# define DPRINTF(args) do { printf args; } while (0)
> +#else
> +# define DPRINTF(args) do {} while (0)
> +#endif
> +
> struct dapmic_softc {
> struct device sc_dev;
> i2c_tag_t sc_tag;
> i2c_addr_t sc_addr;
>
> + int (*sc_ih)(void *);
> + struct task sc_task;
> +
> struct todr_chip_handle sc_todr;
> };
>
> @@ -80,8 +112,11 @@ int dapmic_clock_read(struct dapmic_soft
> int dapmic_clock_write(struct dapmic_softc *, struct clock_ymdhms *);
> int dapmic_gettime(struct todr_chip_handle *, struct timeval *);
> int dapmic_settime(struct todr_chip_handle *, struct timeval *);
> +void dapmic_reset_irq_mask(struct dapmic_softc *);
> void dapmic_reset(void);
> void dapmic_powerdown(void);
> +int dapmic_intr(void *);
> +void dapmic_shutdown_task(void *);
>
> int
> dapmic_match(struct device *parent, void *match, void *aux)
> @@ -96,6 +131,7 @@ dapmic_attach(struct device *parent, str
> {
> struct dapmic_softc *sc = (struct dapmic_softc *)self;
> struct i2c_attach_args *ia = aux;
> + int node = *(int *)ia->ia_cookie;
>
> sc->sc_tag = ia->ia_tag;
> sc->sc_addr = ia->ia_addr;
> @@ -105,12 +141,35 @@ dapmic_attach(struct device *parent, str
> sc->sc_todr.todr_settime = dapmic_settime;
> todr_attach(&sc->sc_todr);
>
> - printf("\n");
> -
> if (cpuresetfn == NULL)
> cpuresetfn = dapmic_reset;
> if (powerdownfn == NULL)
> powerdownfn = dapmic_powerdown;
> +
> + task_set(&sc->sc_task, dapmic_shutdown_task, sc);
> +
> + /* Mask away events we don't care about */
> + dapmic_reg_write(sc, IRQ_MASK_A,
> + 0xff & ~(IRQ_MASK_A_M_RESERVED | IRQ_MASK_A_M_nONKEY));
> + dapmic_reg_write(sc, IRQ_MASK_B, 0xff);
> + dapmic_reg_write(sc, IRQ_MASK_C, 0xff);
> + dapmic_reg_write(sc, IRQ_MASK_D, 0xff);
> +
> + /* Clear past faults and events */
> + dapmic_reg_write(sc, FAULT_LOG, dapmic_reg_read(sc, FAULT_LOG));
> + dapmic_reg_write(sc, EVENT_A, dapmic_reg_read(sc, EVENT_A));
> + dapmic_reg_write(sc, EVENT_B, dapmic_reg_read(sc, EVENT_B));
> + dapmic_reg_write(sc, EVENT_C, dapmic_reg_read(sc, EVENT_C));
> + dapmic_reg_write(sc, EVENT_D, dapmic_reg_read(sc, EVENT_D));
> +
> + if (node != 0) {
> + sc->sc_ih = fdt_intr_establish_idx(node, 0, IPL_CLOCK,
> + dapmic_intr, sc, sc->sc_dev.dv_xname);
> + if (sc->sc_ih == NULL)
> + printf(", can't establish interrupt");
> + }
> +
> + printf("\n");
> }
>
> uint8_t
> @@ -239,11 +298,23 @@ dapmic_settime(struct todr_chip_handle *
> }
>
> void
> +dapmic_reset_irq_mask(struct dapmic_softc *sc)
> +{
> + dapmic_reg_write(sc, IRQ_MASK_A, 0);
> + dapmic_reg_write(sc, IRQ_MASK_B, 0);
> + dapmic_reg_write(sc, IRQ_MASK_C, 0);
> + dapmic_reg_write(sc, IRQ_MASK_D, 0);
> +}
> +
> +void
> dapmic_reset(void)
> {
> struct dapmic_softc *sc = dapmic_cd.cd_devs[0];
> uint8_t reg;
>
> + /* Re-enable irqs and the associated wake-up events */
Can you add a '.' at the end of the sentence to be consistent with the
other comments in this driver?
> + dapmic_reset_irq_mask(sc);
> +
> /* Enable tick alarm wakeup with a one second interval. */
> reg = dapmic_reg_read(sc, ALARM_MO);
> reg &= ~ALARM_MO_TICK_TYPE;
> @@ -266,10 +337,90 @@ dapmic_powerdown(void)
> struct dapmic_softc *sc = dapmic_cd.cd_devs[0];
> uint8_t reg;
>
> + /* Re-enable irqs and the associated wake-up events */
Here as well?
> + dapmic_reset_irq_mask(sc);
> +
> /* Disable tick function such that it doesn't wake us up. */
> reg = dapmic_reg_read(sc, ALARM_Y);
> reg &= ~ALARM_Y_TICK_ON;
> dapmic_reg_write(sc, ALARM_Y, reg);
>
> dapmic_reg_write(sc, CONTROL_F, CONTROL_F_SHUTDOWN);
> +}
> +
> +void
> +dapmic_shutdown_task(void *arg)
> +{
> + extern int allowpowerdown;
> +
> + if (allowpowerdown == 1) {
> + allowpowerdown = 0;
> + prsignal(initprocess, SIGUSR2);
> + }
> +}
> +
> +int
> +dapmic_intr(void *arg)
> +{
> + struct dapmic_softc *sc = arg;
> + uint8_t event_a, event_b, event_c, event_d, fault;
> +
> + event_b = event_c = event_d = 0;
> +
> + event_a = dapmic_reg_read(sc, EVENT_A);
> + DPRINTF(("%s: %s: event_a %#02.2hhx", sc->sc_dev.dv_xname, __func__,
> + event_a));
> +
> + /* Acknowledge all events */
And here.
> + if (event_a & EVENT_A_EVENTS_B) {
> + event_b = dapmic_reg_read(sc, EVENT_B);
> + DPRINTF((", event_b %#02.2hhx", event_b));
> + if (event_b != 0)
> + dapmic_reg_write(sc, EVENT_B, event_b);
> + }
> + if (event_a & EVENT_A_EVENTS_C) {
> + event_c = dapmic_reg_read(sc, EVENT_C);
> + DPRINTF((", event_c %#02.2hhx", event_c));
> + if (event_c != 0)
> + dapmic_reg_write(sc, EVENT_C, event_c);
> + }
> + if (event_a & EVENT_A_EVENTS_D) {
> + event_d = dapmic_reg_read(sc, EVENT_D);
> + DPRINTF((", event_d %#02.2hhx", event_d));
> + if (event_d != 0)
> + dapmic_reg_write(sc, EVENT_D, event_d);
> + }
> + event_a &= ~(EVENT_A_EVENTS_B|EVENT_A_EVENTS_C|EVENT_A_EVENTS_D);
> + if (event_a != 0)
> + dapmic_reg_write(sc, EVENT_A, event_a);
> +
> + DPRINTF(("\n"));
> +
> + fault = dapmic_reg_read(sc, FAULT_LOG);
> + if (fault != 0) {
> + static int warned;
> + if (!warned) {
> + warned = 1;
> + printf("%s: FAULT_LOG %#02.2hhx\n", sc->sc_dev.dv_xname,
> + fault);
> + }
> + /*
> + * Don't blindly acknowledge the fault log bits, else we may
> + * prevent legit behavior like a forced poweroff with a long
> + * power button press.
> + * XXX If nothing useful can be done here, disestablish the
> + * handler instead?
> + */
> +#if 0
> + dapmic_reg_write(sc, FAULT_LOG, fault);
> +#endif
Can we remove the "XXX" bit of the comment and the #if 0 bit of code?
> + }
> +
> + if (event_a & EVENT_A_E_nONKEY)
> + task_add(systq, &sc->sc_task);
> +
> + if (event_a | event_b | event_c | event_d)
> + return 1;
> +
> + return 0;
> }
>
> --
> jca | PGP : 0x1524E7EE / 5135 92C1 AD36 5293 2BDF DDCC 0DFA 74AE 1524 E7EE
>
>
