/* $OpenBSD: elan520.c,v 1.16 2009/01/14 07:58:45 grange Exp $ */ /* $NetBSD: elan520.c,v 1.4 2002/10/02 05:47:15 thorpej Exp $ */ /*- * Copyright (c) 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Device driver for the AMD Elan SC520 System Controller. This attaches * where the "pchb" driver might normally attach, and provides support for * extra features on the SC520, such as the watchdog timer and GPIO. */ #include #include #include #include #include #include #include #include #include #include #include #include struct elansc_softc { struct device sc_dev; bus_space_tag_t sc_memt; bus_space_handle_t sc_memh; /* GPIO interface */ struct gpio_chipset_tag sc_gpio_gc; gpio_pin_t sc_gpio_pins[ELANSC_PIO_NPINS]; /* GP timer */ struct timecounter sc_tc; } *elansc; int elansc_match(struct device *, void *, void *); void elansc_attach(struct device *, struct device *, void *); void elansc_update_cpuspeed(void); void elansc_setperf(int); int elansc_cpuspeed(int *); void elansc_wdogctl(struct elansc_softc *, int, uint16_t); #define elansc_wdogctl_reset(sc) elansc_wdogctl(sc, 1, 0) #define elansc_wdogctl_write(sc, val) elansc_wdogctl(sc, 0, val) int elansc_wdogctl_cb(void *, int); int elansc_gpio_pin_read(void *, int); void elansc_gpio_pin_write(void *, int, int); void elansc_gpio_pin_ctl(void *, int, int); u_int elansc_tc_read(struct timecounter *); struct cfattach elansc_ca = { sizeof(struct elansc_softc), elansc_match, elansc_attach }; struct cfdriver elansc_cd = { NULL, "elansc", DV_DULL }; int elansc_match(struct device *parent, void *match, void *aux) { struct pci_attach_args *pa = aux; if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD && PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_ELANSC520) return (10); /* beat pchb */ return (0); } static const char *elansc_speeds[] = { "(reserved 00)", "100MHz", "133MHz", "(reserved 11)", }; #define RSTBITS "\20\x07SCP\x06HRST\x05SRST\x04WDT\x03SD\x02PRGRST\x01PWRGOOD" void elansc_attach(struct device *parent, struct device *self, void *aux) { struct elansc_softc *sc = (void *) self; struct pci_attach_args *pa = aux; struct gpiobus_attach_args gba; struct timecounter *tc; uint16_t rev, data; uint8_t ressta, cpuctl, tmr; int pin, reg, shift; sc->sc_memt = pa->pa_memt; if (bus_space_map(sc->sc_memt, MMCR_BASE_ADDR, NBPG, 0, &sc->sc_memh) != 0) { printf(": unable to map registers\n"); return; } rev = bus_space_read_2(sc->sc_memt, sc->sc_memh, MMCR_REVID); cpuctl = bus_space_read_1(sc->sc_memt, sc->sc_memh, MMCR_CPUCTL); ressta = bus_space_read_1(sc->sc_memt, sc->sc_memh, MMCR_RESSTA); printf(": product %d stepping %d.%d, CPU clock %s, reset %b\n", (rev & REVID_PRODID) >> REVID_PRODID_SHIFT, (rev & REVID_MAJSTEP) >> REVID_MAJSTEP_SHIFT, (rev & REVID_MINSTEP), elansc_speeds[cpuctl & CPUCTL_CPU_CLK_SPD_MASK], ressta, RSTBITS); /* * Determine cause of the last reset, and issue a warning if it * was due to watchdog expiry. */ if (ressta & RESSTA_WDT_RST_DET) printf("%s: WARNING: LAST RESET DUE TO WATCHDOG EXPIRATION!\n", sc->sc_dev.dv_xname); bus_space_write_1(sc->sc_memt, sc->sc_memh, MMCR_RESSTA, ressta); /* Set up the watchdog registers with some defaults. */ elansc_wdogctl_write(sc, WDTMRCTL_WRST_ENB | WDTMRCTL_EXP_SEL30); /* ...and clear it. */ elansc_wdogctl_reset(sc); wdog_register(sc, elansc_wdogctl_cb); elansc = sc; cpu_setperf = elansc_setperf; cpu_cpuspeed = elansc_cpuspeed; elansc_update_cpuspeed(); /* Initialize GPIO pins array */ for (pin = 0; pin < ELANSC_PIO_NPINS; pin++) { sc->sc_gpio_pins[pin].pin_num = pin; sc->sc_gpio_pins[pin].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT; /* Read initial state */ reg = (pin < 16 ? MMCR_PIODIR15_0 : MMCR_PIODIR31_16); shift = pin % 16; data = bus_space_read_2(sc->sc_memt, sc->sc_memh, reg); if ((data & (1 << shift)) == 0) sc->sc_gpio_pins[pin].pin_flags = GPIO_PIN_INPUT; else sc->sc_gpio_pins[pin].pin_flags = GPIO_PIN_OUTPUT; if (elansc_gpio_pin_read(sc, pin) == 0) sc->sc_gpio_pins[pin].pin_state = GPIO_PIN_LOW; else sc->sc_gpio_pins[pin].pin_state = GPIO_PIN_HIGH; } /* Create controller tag */ sc->sc_gpio_gc.gp_cookie = sc; sc->sc_gpio_gc.gp_pin_read = elansc_gpio_pin_read; sc->sc_gpio_gc.gp_pin_write = elansc_gpio_pin_write; sc->sc_gpio_gc.gp_pin_ctl = elansc_gpio_pin_ctl; gba.gba_name = "gpio"; gba.gba_gc = &sc->sc_gpio_gc; gba.gba_pins = sc->sc_gpio_pins; gba.gba_npins = ELANSC_PIO_NPINS; /* Attach GPIO framework */ config_found(&sc->sc_dev, &gba, gpiobus_print); /* Disable GP1/2, clear the current count, and set the period to max */ bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR1CTL, GPTMRCTL_ENB_WR | GPTMRCTL_CONT_CMP | GPTMRCTL_PSC_SEL | GPTMRCTL_RTG); bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR1CNT, 0); bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR1MAXCMPA, 0); bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR2CTL, GPTMRCTL_ENB_WR | GPTMRCTL_CONT_CMP); bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR2CNT, 0); bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR2MAXCMPA, 0); tmr = bus_space_read_1(sc->sc_memt, sc->sc_memh, SWTMRCFG); /* Enable GP1/2 */ bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR1CTL, GPTMRCTL_ENB | GPTMRCTL_ENB_WR | GPTMRCTL_CONT_CMP | GPTMRCTL_PSC_SEL | GPTMRCTL_RTG); bus_space_write_2(sc->sc_memt, sc->sc_memh, GPTMR2CTL, GPTMRCTL_ENB | GPTMRCTL_ENB_WR | GPTMRCTL_CONT_CMP); /* Attach timer */ tc = &sc->sc_tc; tc->tc_get_timecount = elansc_tc_read; tc->tc_poll_pps = NULL; tc->tc_counter_mask = ~0; tc->tc_frequency = (tmr & 1) ? (33000000 / 4) : (33333333 / 4); tc->tc_name = sc->sc_dev.dv_xname; tc->tc_quality = 1000; tc->tc_priv = sc; tc_init(tc); } u_int elansc_tc_read(struct timecounter *tc) { struct elansc_softc *sc = tc->tc_priv; u_int32_t m1, m2, l; do { m1 = bus_space_read_2(sc->sc_memt, sc->sc_memh, GPTMR1CNT); l = bus_space_read_2(sc->sc_memt, sc->sc_memh, GPTMR2CNT); m2 = bus_space_read_2(sc->sc_memt, sc->sc_memh, GPTMR1CNT); } while (m1 != m2); return ((m1 << 16) | l); } void elansc_wdogctl(struct elansc_softc *sc, int do_reset, uint16_t val) { int s; uint8_t echo_mode; s = splhigh(); /* Switch off GP bus echo mode. */ echo_mode = bus_space_read_1(sc->sc_memt, sc->sc_memh, MMCR_GPECHO); bus_space_write_1(sc->sc_memt, sc->sc_memh, MMCR_GPECHO, echo_mode & ~GPECHO_GP_ECHO_ENB); if (do_reset) { /* Reset the watchdog. */ bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL, WDTMRCTL_RESET1); bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL, WDTMRCTL_RESET2); } else { /* Unlock the register. */ bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL, WDTMRCTL_UNLOCK1); bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL, WDTMRCTL_UNLOCK2); /* Write the value. */ bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL, val); } /* Switch GP bus echo mode back. */ bus_space_write_1(sc->sc_memt, sc->sc_memh, MMCR_GPECHO, echo_mode); splx(s); } static const struct { int period; /* whole seconds */ uint16_t exp; /* exponent select */ } elansc_wdog_periods[] = { { 1, WDTMRCTL_EXP_SEL25 }, { 2, WDTMRCTL_EXP_SEL26 }, { 4, WDTMRCTL_EXP_SEL27 }, { 8, WDTMRCTL_EXP_SEL28 }, { 16, WDTMRCTL_EXP_SEL29 }, { 32, WDTMRCTL_EXP_SEL30 }, }; int elansc_wdogctl_cb(void *self, int period) { struct elansc_softc *sc = self; int i; if (period == 0) { elansc_wdogctl_write(sc, WDTMRCTL_WRST_ENB | WDTMRCTL_EXP_SEL30); } else { for (i = 0; i < (sizeof(elansc_wdog_periods) / sizeof(elansc_wdog_periods[0])) - 1; i++) if (elansc_wdog_periods[i].period >= period) break; period = elansc_wdog_periods[i].period; elansc_wdogctl_write(sc, WDTMRCTL_ENB | WDTMRCTL_WRST_ENB | elansc_wdog_periods[i].exp); elansc_wdogctl_reset(sc); } return (period); } void elansc_update_cpuspeed(void) { static const int elansc_mhz[] = { 0, 100, 133, 999 }; uint8_t cpuctl; cpuctl = bus_space_read_1(elansc->sc_memt, elansc->sc_memh, MMCR_CPUCTL); cpuspeed = elansc_mhz[cpuctl & CPUCTL_CPU_CLK_SPD_MASK]; } void elansc_setperf(int level) { uint32_t eflags; uint8_t cpuctl, speed; level = (level > 50) ? 100 : 0; cpuctl = bus_space_read_1(elansc->sc_memt, elansc->sc_memh, MMCR_CPUCTL); speed = (level == 100) ? 2 : 1; if ((cpuctl & CPUCTL_CPU_CLK_SPD_MASK) == speed) return; eflags = read_eflags(); disable_intr(); bus_space_write_1(elansc->sc_memt, elansc->sc_memh, MMCR_CPUCTL, (cpuctl & ~CPUCTL_CPU_CLK_SPD_MASK) | speed); enable_intr(); write_eflags(eflags); elansc_update_cpuspeed(); } int elansc_cpuspeed(int *freq) { *freq = cpuspeed; return (0); } int elansc_gpio_pin_read(void *arg, int pin) { struct elansc_softc *sc = arg; int reg, shift; u_int16_t data; reg = (pin < 16 ? MMCR_PIODATA15_0 : MMCR_PIODATA31_16); shift = pin % 16; data = bus_space_read_2(sc->sc_memt, sc->sc_memh, reg); return ((data >> shift) & 0x1); } void elansc_gpio_pin_write(void *arg, int pin, int value) { struct elansc_softc *sc = arg; int reg, shift; u_int16_t data; reg = (pin < 16 ? MMCR_PIODATA15_0 : MMCR_PIODATA31_16); shift = pin % 16; data = bus_space_read_2(sc->sc_memt, sc->sc_memh, reg); if (value == 0) data &= ~(1 << shift); else if (value == 1) data |= (1 << shift); bus_space_write_2(sc->sc_memt, sc->sc_memh, reg, data); } void elansc_gpio_pin_ctl(void *arg, int pin, int flags) { struct elansc_softc *sc = arg; int reg, shift; u_int16_t data; reg = (pin < 16 ? MMCR_PIODIR15_0 : MMCR_PIODIR31_16); shift = pin % 16; data = bus_space_read_2(sc->sc_memt, sc->sc_memh, reg); if (flags & GPIO_PIN_INPUT) data &= ~(1 << shift); if (flags & GPIO_PIN_OUTPUT) data |= (1 << shift); bus_space_write_2(sc->sc_memt, sc->sc_memh, reg, data); }