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/* $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 <jcs@openbsd.org>
*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/ic/dwiicvar.h>
/* 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);
}
}
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