/* $OpenBSD: dwiic_pci.c,v 1.4 2019/03/16 02:40:43 jcs Exp $ */ /* * Synopsys DesignWare I2C controller * PCI attachment * * Copyright (c) 2015-2017 joshua stein * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include /* 13.3: I2C Additional Registers Summary */ #define LPSS_RESETS 0x204 #define LPSS_RESETS_I2C (1 << 0) | (1 << 1) #define LPSS_RESETS_IDMA (1 << 2) #define LPSS_ACTIVELTR 0x210 #define LPSS_IDLELTR 0x214 #define LPSS_CAPS 0x2fc #define LPSS_CAPS_NO_IDMA (1 << 8) #define LPSS_CAPS_TYPE_SHIFT 4 #define LPSS_CAPS_TYPE_MASK (0xf << LPSS_CAPS_TYPE_SHIFT) int dwiic_pci_match(struct device *, void *, void *); void dwiic_pci_attach(struct device *, struct device *, void *); int dwiic_pci_activate(struct device *, int); void dwiic_pci_bus_scan(struct device *, struct i2cbus_attach_args *, void *); #include "acpi.h" #if NACPI > 0 struct aml_node *acpi_pci_match(struct device *dev, struct pci_attach_args *pa); #endif struct cfattach dwiic_pci_ca = { sizeof(struct dwiic_softc), dwiic_pci_match, dwiic_pci_attach, NULL, dwiic_pci_activate, }; const struct pci_matchid dwiic_pci_ids[] = { { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_100SERIES_LP_I2C_1 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_100SERIES_LP_I2C_2 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_I2C_1 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_I2C_2 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_I2C_3 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_I2C_4 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_I2C_5 }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_I2C_6 }, }; int dwiic_pci_match(struct device *parent, void *match, void *aux) { return (pci_matchbyid(aux, dwiic_pci_ids, nitems(dwiic_pci_ids))); } void dwiic_pci_attach(struct device *parent, struct device *self, void *aux) { struct dwiic_softc *sc = (struct dwiic_softc *)self; struct pci_attach_args *pa = aux; #if NACPI > 0 struct aml_node *node; #endif bus_size_t iosize; pci_intr_handle_t ih; const char *intrstr = NULL; uint8_t type; memcpy(&sc->sc_paa, pa, sizeof(sc->sc_paa)); pci_set_powerstate(pa->pa_pc, pa->pa_tag, PCI_PMCSR_STATE_D0); if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_MEM_TYPE_64BIT, 0, &sc->sc_iot, &sc->sc_ioh, NULL, &iosize, 0)) { printf(": can't map mem space\n"); return; } sc->sc_caps = bus_space_read_4(sc->sc_iot, sc->sc_ioh, LPSS_CAPS); type = sc->sc_caps & LPSS_CAPS_TYPE_MASK; type >>= LPSS_CAPS_TYPE_SHIFT; if (type != 0) { printf(": type %d not supported\n", type); return; } /* un-reset - page 958 */ bus_space_write_4(sc->sc_iot, sc->sc_ioh, LPSS_RESETS, (LPSS_RESETS_I2C | LPSS_RESETS_IDMA)); /* fetch timing parameters */ sc->ss_hcnt = dwiic_read(sc, DW_IC_SS_SCL_HCNT); sc->ss_lcnt = dwiic_read(sc, DW_IC_SS_SCL_LCNT); sc->fs_hcnt = dwiic_read(sc, DW_IC_FS_SCL_HCNT); sc->fs_lcnt = dwiic_read(sc, DW_IC_FS_SCL_LCNT); sc->sda_hold_time = dwiic_read(sc, DW_IC_SDA_HOLD); #if NACPI > 0 /* fetch more accurate timing parameters from ACPI, if possible */ node = acpi_pci_match(self, &sc->sc_paa); if (node != NULL) { sc->sc_devnode = node; dwiic_acpi_get_params(sc, "SSCN", &sc->ss_hcnt, &sc->ss_lcnt, NULL); dwiic_acpi_get_params(sc, "FMCN", &sc->fs_hcnt, &sc->fs_lcnt, &sc->sda_hold_time); } #endif if (dwiic_init(sc)) { printf(": failed initializing\n"); return; } /* leave the controller disabled */ dwiic_write(sc, DW_IC_INTR_MASK, 0); dwiic_enable(sc, 0); dwiic_read(sc, DW_IC_CLR_INTR); /* install interrupt handler */ sc->sc_poll = 1; if (pci_intr_map(&sc->sc_paa, &ih) == 0) { intrstr = pci_intr_string(sc->sc_paa.pa_pc, ih); sc->sc_ih = pci_intr_establish(sc->sc_paa.pa_pc, ih, IPL_BIO, dwiic_intr, sc, sc->sc_dev.dv_xname); if (sc->sc_ih != NULL) { printf(": %s", intrstr); sc->sc_poll = 0; } } if (sc->sc_poll) printf(": polling"); printf("\n"); rw_init(&sc->sc_i2c_lock, "iiclk"); /* setup and attach iic bus */ sc->sc_i2c_tag.ic_cookie = sc; sc->sc_i2c_tag.ic_acquire_bus = dwiic_i2c_acquire_bus; sc->sc_i2c_tag.ic_release_bus = dwiic_i2c_release_bus; sc->sc_i2c_tag.ic_exec = dwiic_i2c_exec; sc->sc_i2c_tag.ic_intr_establish = dwiic_i2c_intr_establish; sc->sc_i2c_tag.ic_intr_string = dwiic_i2c_intr_string; bzero(&sc->sc_iba, sizeof(sc->sc_iba)); sc->sc_iba.iba_name = "iic"; sc->sc_iba.iba_tag = &sc->sc_i2c_tag; sc->sc_iba.iba_bus_scan = dwiic_pci_bus_scan; sc->sc_iba.iba_bus_scan_arg = sc; config_found((struct device *)sc, &sc->sc_iba, iicbus_print); return; } int dwiic_pci_activate(struct device *self, int act) { struct dwiic_softc *sc = (struct dwiic_softc *)self; switch (act) { case DVACT_WAKEUP: bus_space_write_4(sc->sc_iot, sc->sc_ioh, LPSS_RESETS, (LPSS_RESETS_I2C | LPSS_RESETS_IDMA)); dwiic_init(sc); break; } dwiic_activate(self, act); return 0; } void dwiic_pci_bus_scan(struct device *iic, struct i2cbus_attach_args *iba, void *aux) { struct dwiic_softc *sc = (struct dwiic_softc *)aux; sc->sc_iic = iic; if (sc->sc_devnode != NULL) { /* * XXX: until we can figure out why interrupts don't arrive for * i2c slave devices on intel 100 series and newer, force * polling for ihidev. */ sc->sc_poll_ihidev = 1; aml_find_node(sc->sc_devnode, "_HID", dwiic_acpi_found_hid, sc); } }