この記事は、NetBSD Advent Calendar 2024の17日目の記事です。
AMD GPIOに対応させてみる
前回はQualcom製SOC用のGPIOドライバーを一読して、AMD GPIO用に改造するベース にできそうな感触を持ちました。 今回は、AMD GPIO用に変更してみます。用意するのはamdgpioreg.hとamdgpio.cです。
まず最初にソースコードを掲載しておきます。
$ cat /usr/src/sys/dev/acpi/amdgpioreg.h #ifndef _AMDGPIOREG_H #define _AMDGPIOREG_H #define AMDGPIO_NPINS 184 #define AMDGPIO_PIN_REG(pin) ((pin) * 4) #define AMDGPIO_CONF_LEVEL 0x00000100 #define AMDGPIO_CONF_ACTLO 0x00000200 #define AMDGPIO_CONF_ACTBOTH 0x00000400 #define AMDGPIO_CONF_MASK 0x00000600 #define AMDGPIO_CONF_INTR_EN 0x00000800 #define AMDGPIO_CONF_INTR_MASK_EN 0x00001000 #define AMDGPIO_CONF_GPIORXSTATE 0x00010000 #define AMDGPIO_CONF_GPIOTXSTATE 0x00400000 #define AMDGPIO_CONF_GPIOTXSTATE_EN 0x00800000 #define AMDGPIO_CONF_INTR_STATUS 0x10000000 /* n should be 0 or 1. */ #define AMDGPIO_INTR_STATUS(n) (0x2f8 + (n) * 4) #define AMDGPIO_INTR_MASTER 0xfc #define AMDGPIO_INTR_MASTER_EIO 0x20000000 #define AMDGPIO_INTR_STATUS_NBITS 46 #define AMDGPIO_INTR_NPINS 4 #endif /* _AMDGPIOREG_H */
$ cat /usr/src/sys/dev/acpi/amdgpio.c #include <sys/param.h> #include <sys/bus.h> #include <sys/cpu.h> #include <sys/device.h> #include <sys/gpio.h> #include <sys/kmem.h> #include <sys/mutex.h> #include <sys/queue.h> #include <dev/acpi/acpireg.h> #include <dev/acpi/acpivar.h> #include <dev/acpi/acpi_event.h> #include <dev/acpi/acpi_gpio.h> #include <dev/acpi/acpi_intr.h> #include <dev/acpi/amdgpioreg.h> #include <dev/gpio/gpiovar.h> struct amdgpio_config { u_int num_pins; int (*translate)(ACPI_RESOURCE_GPIO *); }; struct amdgpio_intr_handler { int (*ih_func)(void *); void *ih_arg; int ih_pin; LIST_ENTRY(amdgpio_intr_handler) ih_list; }; struct amdgpio_softc { device_t sc_dev; device_t sc_gpiodev; bus_space_handle_t sc_bsh; bus_space_tag_t sc_bst; const struct amdgpio_config *sc_config; struct gpio_chipset_tag sc_gc; gpio_pin_t *sc_pins; LIST_HEAD(, amdgpio_intr_handler) sc_intrs; kmutex_t sc_lock; }; #define RD4(sc, reg) \ bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) #define WR4(sc, reg, val) \ bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) static int amdgpio_match(device_t, cfdata_t, void *); static void amdgpio_attach(device_t, device_t, void *); static int amdgpio_pin_read(void *, int); static void amdgpio_pin_write(void *, int, int); static void amdgpio_pin_ctl(void *, int, int); static void * amdgpio_intr_establish(void *, int, int, int, int (*)(void *), void *); static void amdgpio_intr_disestablish(void *, void *); static bool amdgpio_intr_str(void *, int, int, char *, size_t); static void amdgpio_intr_mask(void *, void *); static void amdgpio_intr_unmask(void *, void *); static int amdgpio_acpi_translate(void *, ACPI_RESOURCE_GPIO *, void **); static void amdgpio_register_event(void *, struct acpi_event *, ACPI_RESOURCE_GPIO *); static int amdgpio_intr(void *); CFATTACH_DECL_NEW(amdgpio, sizeof(struct amdgpio_softc), amdgpio_match, amdgpio_attach, NULL, NULL); #define AMDGPIO_NUM_PINS 184 static int amdgpio_translate(ACPI_RESOURCE_GPIO *gpio) { const ACPI_INTEGER pin = gpio->PinTable[0]; if (pin < AMDGPIO_NUM_PINS) { return gpio->PinTable[0]; } switch (pin) { case 0x0: case 0x8: /* TPDD */ case 0x28: /* TPNL */ case 0x3a: case 0x3b: case 0x3d: case 0x3e: return pin; default: return -1; } } static struct amdgpio_config amdgpio_config = { .num_pins = AMDGPIO_NUM_PINS, .translate = amdgpio_translate, /* TODO: REMOVE */ }; static const struct device_compatible_entry compat_data[] = { { .compat = "AMDI0030", .data = &amdgpio_config }, DEVICE_COMPAT_EOL }; static int amdgpio_match(device_t parent, cfdata_t cf, void *aux) { struct acpi_attach_args *aa = aux; return acpi_compatible_match(aa, compat_data); } static void amdgpio_attach(device_t parent, device_t self, void *aux) { struct amdgpio_softc * const sc = device_private(self); struct acpi_attach_args *aa = aux; struct gpiobus_attach_args gba; ACPI_HANDLE hdl = aa->aa_node->ad_handle; struct acpi_resources res; struct acpi_mem *mem; struct acpi_irq *irq; ACPI_STATUS rv; int error, pin; void *ih; sc->sc_dev = self; sc->sc_config = acpi_compatible_lookup(aa, compat_data)->data; sc->sc_bst = aa->aa_memt; KASSERT(sc->sc_config != NULL); LIST_INIT(&sc->sc_intrs); mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM); rv = acpi_resource_parse(sc->sc_dev, hdl, "_CRS", &res, &acpi_resource_parse_ops_default); if (ACPI_FAILURE(rv)) { return; } mem = acpi_res_mem(&res, 0); if (mem == NULL) { aprint_error_dev(self, "couldn't find mem resource\n"); goto done; } irq = acpi_res_irq(&res, 0); if (irq == NULL) { aprint_error_dev(self, "couldn't find irq resource\n"); goto done; } error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 0, &sc->sc_bsh); if (error) { aprint_error_dev(self, "couldn't map registers\n"); goto done; } sc->sc_pins = kmem_zalloc(sizeof(*sc->sc_pins) * sc->sc_config->num_pins, KM_SLEEP); for (pin = 0; pin < sc->sc_config->num_pins; pin++) { sc->sc_pins[pin].pin_num = pin; sc->sc_pins[pin].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT; sc->sc_pins[pin].pin_intrcaps = GPIO_INTR_POS_EDGE | GPIO_INTR_NEG_EDGE | GPIO_INTR_DOUBLE_EDGE | GPIO_INTR_HIGH_LEVEL | GPIO_INTR_LOW_LEVEL | GPIO_INTR_MPSAFE; /* It's not safe to read all pins, so leave pin state unknown */ sc->sc_pins[pin].pin_state = 0; } sc->sc_gc.gp_cookie = sc; sc->sc_gc.gp_pin_read = amdgpio_pin_read; sc->sc_gc.gp_pin_write = amdgpio_pin_write; sc->sc_gc.gp_pin_ctl = amdgpio_pin_ctl; sc->sc_gc.gp_intr_establish = amdgpio_intr_establish; sc->sc_gc.gp_intr_disestablish = amdgpio_intr_disestablish; sc->sc_gc.gp_intr_str = amdgpio_intr_str; sc->sc_gc.gp_intr_mask = amdgpio_intr_mask; sc->sc_gc.gp_intr_unmask = amdgpio_intr_unmask; rv = acpi_event_create_gpio(self, hdl, amdgpio_register_event, sc); if (ACPI_FAILURE(rv)) { if (rv != AE_NOT_FOUND) { aprint_error_dev(self, "failed to create events: %s\n", AcpiFormatException(rv)); } goto done; } ih = acpi_intr_establish(self, (uint64_t)(uintptr_t)hdl, IPL_VM, false, amdgpio_intr, sc, device_xname(self)); if (ih == NULL) { aprint_error_dev(self, "couldn't establish interrupt\n"); goto done; } memset(&gba, 0, sizeof(gba)); gba.gba_gc = &sc->sc_gc; gba.gba_pins = sc->sc_pins; gba.gba_npins = sc->sc_config->num_pins; sc->sc_gpiodev = config_found(self, &gba, gpiobus_print, CFARGS(.iattr = "gpiobus")); if (sc->sc_gpiodev != NULL) { acpi_gpio_register(aa->aa_node, self, amdgpio_acpi_translate, sc); } done: acpi_resource_cleanup(&res); } static int amdgpio_acpi_translate(void *priv, ACPI_RESOURCE_GPIO *gpio, void **gpiop) { struct amdgpio_softc * const sc = priv; const ACPI_INTEGER pin = gpio->PinTable[0]; int xpin; xpin = sc->sc_config->translate(gpio); aprint_debug_dev(sc->sc_dev, "translate %#lx -> %u\n", pin, xpin); if (gpiop != NULL) { if (sc->sc_gpiodev != NULL) { *gpiop = device_private(sc->sc_gpiodev); } else { device_printf(sc->sc_dev, "no gpiodev for pin %#lx -> %u\n", pin, xpin); xpin = -1; } } return xpin; } static int amdgpio_acpi_event(void *priv) { struct acpi_event * const ev = priv; acpi_event_notify(ev); return 1; } static void amdgpio_register_event(void *priv, struct acpi_event *ev, ACPI_RESOURCE_GPIO *gpio) { struct amdgpio_softc * const sc = priv; int irqmode; void *ih; const int pin = amdgpio_acpi_translate(sc, gpio, NULL); if (pin < 0 || pin == 0x8) { aprint_error_dev(sc->sc_dev, "ignoring event for pin %#x (out of range)\n", gpio->PinTable[0]); return; } if (gpio->Triggering == ACPI_LEVEL_SENSITIVE) { irqmode = gpio->Polarity == ACPI_ACTIVE_HIGH ? GPIO_INTR_HIGH_LEVEL : GPIO_INTR_LOW_LEVEL; } else { KASSERT(gpio->Triggering == ACPI_EDGE_SENSITIVE); if (gpio->Polarity == ACPI_ACTIVE_LOW) { irqmode = GPIO_INTR_NEG_EDGE; } else if (gpio->Polarity == ACPI_ACTIVE_HIGH) { irqmode = GPIO_INTR_POS_EDGE; } else { KASSERT(gpio->Polarity == ACPI_ACTIVE_BOTH); irqmode = GPIO_INTR_DOUBLE_EDGE; } } ih = amdgpio_intr_establish(sc, pin, IPL_VM, irqmode, amdgpio_acpi_event, ev); if (ih == NULL) { aprint_error_dev(sc->sc_dev, "couldn't register event for pin %#x\n", gpio->PinTable[0]); return; } if (gpio->Triggering == ACPI_LEVEL_SENSITIVE) { acpi_event_set_intrcookie(ev, ih); } } static int amdgpio_pin_read(void *priv, int pin) { struct amdgpio_softc * const sc = priv; uint32_t val; if (pin < 0 || pin >= sc->sc_config->num_pins) { return 0; } if ((sc->sc_pins[pin].pin_caps & GPIO_PIN_INPUT) == 0) { return 0; } val = RD4(sc, AMDGPIO_PIN_REG(pin)); return (val & AMDGPIO_CONF_GPIORXSTATE) ? 1 : 0; } static void amdgpio_pin_write(void *priv, int pin, int pinval) { struct amdgpio_softc * const sc = priv; uint32_t val; if (pin < 0 || pin >= sc->sc_config->num_pins) { return; } if ((sc->sc_pins[pin].pin_caps & GPIO_PIN_OUTPUT) == 0) { return; } val = RD4(sc, AMDGPIO_PIN_REG(pin)); if (pinval) { val |= AMDGPIO_CONF_GPIOTXSTATE; } else { val &= ~AMDGPIO_CONF_GPIOTXSTATE; } WR4(sc, AMDGPIO_PIN_REG(pin), val); } static void amdgpio_pin_ctl(void *priv, int pin, int flags) { /* Nothing to do here, as firmware has already configured pins. */ } static void * amdgpio_intr_establish(void *priv, int pin, int ipl, int irqmode, int (*func)(void *), void *arg) { struct amdgpio_softc * const sc = priv; struct amdgpio_intr_handler *aih, *aihp; uint32_t dect; uint32_t val; if (pin < 0 || pin >= sc->sc_config->num_pins) { return NULL; } if (ipl != IPL_VM) { device_printf(sc->sc_dev, "%s: only IPL_VM supported\n", __func__); return NULL; } aih = kmem_alloc(sizeof(*aih), KM_SLEEP); aih->ih_func = func; aih->ih_arg = arg; aih->ih_pin = pin; mutex_enter(&sc->sc_lock); LIST_FOREACH(aihp, &sc->sc_intrs, ih_list) { if (aihp->ih_pin == aih->ih_pin) { mutex_exit(&sc->sc_lock); kmem_free(aih, sizeof(*aih)); device_printf(sc->sc_dev, "%s: pin %d already establish\n", __func__, pin); return NULL; } } LIST_INSERT_HEAD(&sc->sc_intrs, aih, ih_list); if ((irqmode & GPIO_INTR_LEVEL_MASK) != 0) { dect = AMDGPIO_CONF_LEVEL; } else { KASSERT((irqmode & GPIO_INTR_EDGE_MASK) != 0); if ((irqmode & GPIO_INTR_NEG_EDGE) != 0) { dect = AMDGPIO_CONF_ACTLO; #if 0 /* XXX */ } else if ((irqmode & GPIO_INTR_POS_EDGE) != 0) { dect = TLMM_GPIO_INTR_CFG_INTR_DECT_CTL_EDGE_POS; #endif } else { KASSERT((irqmode & GPIO_INTR_DOUBLE_EDGE) != 0); dect = AMDGPIO_CONF_ACTBOTH; } } val = RD4(sc, AMDGPIO_PIN_REG(pin)); val |= dect; val |= AMDGPIO_CONF_INTR_MASK_EN | AMDGPIO_CONF_INTR_EN; WR4(sc, AMDGPIO_PIN_REG(pin), val); mutex_exit(&sc->sc_lock); return aih; } static void amdgpio_intr_disestablish(void *priv, void *ih) { struct amdgpio_softc * const sc = priv; struct amdgpio_intr_handler *aih = ih; uint32_t val; mutex_enter(&sc->sc_lock); LIST_REMOVE(aih, ih_list); val = RD4(sc, AMDGPIO_PIN_REG(aih->ih_pin)); val &= ~(AMDGPIO_CONF_INTR_EN | AMDGPIO_CONF_INTR_MASK_EN); WR4(sc, AMDGPIO_PIN_REG(aih->ih_pin), val); mutex_exit(&sc->sc_lock); kmem_free(aih, sizeof(*aih)); } static bool amdgpio_intr_str(void *priv, int pin, int irqmode, char *buf, size_t buflen) { struct amdgpio_softc * const sc = priv; int rv; rv = snprintf(buf, buflen, "%s pin %d", device_xname(sc->sc_dev), pin); return rv < buflen; } static void amdgpio_intr_mask(void *priv, void *ih) { struct amdgpio_softc * const sc = priv; struct amdgpio_intr_handler *aih = ih; uint32_t val; val = RD4(sc, AMDGPIO_PIN_REG(aih->ih_pin)); val &= ~AMDGPIO_CONF_INTR_MASK_EN; WR4(sc, AMDGPIO_PIN_REG(aih->ih_pin), val); } static void amdgpio_intr_unmask(void *priv, void *ih) { struct amdgpio_softc * const sc = priv; struct amdgpio_intr_handler *aih = ih; uint32_t val; val = RD4(sc, AMDGPIO_PIN_REG(aih->ih_pin)); val |= AMDGPIO_CONF_INTR_MASK_EN; WR4(sc, AMDGPIO_PIN_REG(aih->ih_pin), val); } static int amdgpio_intr(void *priv) { struct amdgpio_softc * const sc = priv; struct amdgpio_intr_handler *aih; int rv = 0; uint64_t status; uint32_t val; mutex_enter(&sc->sc_lock); status = RD4(sc, AMDGPIO_INTR_STATUS(1)); status <<= 32; status |= RD4(sc, AMDGPIO_INTR_STATUS(0)); status &= __BITS(0, AMDGPIO_INTR_STATUS_NBITS - 1); if (status == 0) { rv = 1; goto out; } LIST_FOREACH(aih, &sc->sc_intrs, ih_list) { const int pin = aih->ih_pin; if ((status & __BIT(pin / 4)) == 0) { continue; } val = RD4(sc, AMDGPIO_PIN_REG(pin)); if ((val & AMDGPIO_CONF_INTR_STATUS) != 0) { rv |= aih->ih_func(aih->ih_arg); val &= ~(AMDGPIO_CONF_INTR_MASK_EN | AMDGPIO_CONF_INTR_EN); WR4(sc, AMDGPIO_PIN_REG(pin), val); } } /* Signal end of interrupt */ val = RD4(sc, AMDGPIO_INTR_MASTER); val |= AMDGPIO_INTR_MASTER_EIO; WR4(sc, AMDGPIO_INTR_MASTER, val); out: mutex_exit(&sc->sc_lock); return rv; }
実際に動かすには、以下のパッチも必要です。
$ cvs diff -u sys/dev/acpi/files.acpi Index: sys/dev/acpi/files.acpi =================================================================== RCS file: /cvsroot/src/sys/dev/acpi/files.acpi,v retrieving revision 1.135 diff -u -r1.135 files.acpi --- sys/dev/acpi/files.acpi 13 Dec 2024 13:30:10 -0000 1.135 +++ sys/dev/acpi/files.acpi 28 Dec 2024 01:01:01 -0000 @@ -347,4 +347,9 @@ attach qcomiic at acpinodebus file dev/acpi/qcomiic.c qcomiic +# AMD GPIO +device amdgpio: gpiobus +attach amdgpio at acpinodebus +file dev/acpi/amdgpio.c amdgpio + include "dev/acpi/wmi/files.wmi"
qcomgpio(4)との違いは、単純にレジスターを読み取る部分がメインです。amdgpioreg.hにあるAMDGPIO_PIN_REGのマクロにあるように 配置されているのに気を付けるくらいかなかと思います。 また、前回も書きましたが、割り込みで処理を完了したらアクノリッジが必要です。
man pageを書いたら、commitできればと思っています。
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