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/* $OpenBSD: imxiic_acpi.c,v 1.1 2020/11/17 14:31:59 patrick Exp $ */
/*
* Copyright (c) 2015, 2016 joshua stein <jcs@openbsd.org>
* Copyright (c) 2020 Patrick Wildt <patrick@blueri.se>
*
* 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 <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpidev.h>
#include <dev/acpi/amltypes.h>
#include <dev/acpi/dsdt.h>
#include <dev/ic/imxiicvar.h>
struct imxiic_acpi_softc {
struct imxiic_softc ac_sc;
struct acpi_softc *ac_acpi;
struct aml_node *ac_devnode;
struct device *ac_iic;
};
struct imxiic_crs {
uint16_t i2c_addr;
struct aml_node *devnode;
};
int imxiic_acpi_match(struct device *, void *, void *);
void imxiic_acpi_attach(struct device *, struct device *, void *);
int imxiic_acpi_parse_crs(int, union acpi_resource *, void *);
void imxiic_acpi_bus_scan(struct device *, struct i2cbus_attach_args *,
void *);
int imxiic_acpi_found_hid(struct aml_node *, void *);
struct cfattach imxiic_acpi_ca = {
sizeof(struct imxiic_acpi_softc),
imxiic_acpi_match,
imxiic_acpi_attach,
NULL,
NULL,
};
const char *imxiic_hids[] = {
"NXP0001",
NULL
};
int
imxiic_acpi_match(struct device *parent, void *match, void *aux)
{
struct acpi_attach_args *aaa = aux;
struct cfdata *cf = match;
return acpi_matchhids(aaa, imxiic_hids, cf->cf_driver->cd_name);
}
void
imxiic_acpi_attach(struct device *parent, struct device *self, void *aux)
{
struct imxiic_acpi_softc *ac = (struct imxiic_acpi_softc *)self;
struct imxiic_softc *sc = &ac->ac_sc;
struct acpi_attach_args *aaa = aux;
struct i2cbus_attach_args iba;
ac->ac_acpi = (struct acpi_softc *)parent;
ac->ac_devnode = aaa->aaa_node;
printf(" %s", ac->ac_devnode->name);
if (aaa->aaa_naddr < 1) {
printf(": no registers\n");
return;
}
printf(" addr 0x%llx/0x%llx", aaa->aaa_addr[0], aaa->aaa_size[0]);
sc->sc_iot = aaa->aaa_bst[0];
if (bus_space_map(sc->sc_iot, aaa->aaa_addr[0], aaa->aaa_size[0],
0, &sc->sc_ioh)) {
printf(": can't map registers\n");
return;
}
sc->sc_reg_shift = 0;
sc->sc_clk_div = imxiic_vf610_clk_div;
sc->sc_clk_ndiv = nitems(imxiic_vf610_clk_div);
sc->sc_type = I2C_TYPE_VF610;
/*
* In comparison to the device tree, it looks like the clock-frequency
* property is actually the clock supplied to the controller, and not
* the bitrate. Using the default 100 kHz value seems to work, since
* there's no other property we can read.
*/
sc->sc_clkrate = acpi_getpropint(ac->ac_devnode,
"clock-frequency", 0) / 1000;
sc->sc_bitrate = 100000 / 1000;
if (sc->sc_clkrate == 0) {
printf(": clock frequency unknown\n");
return;
}
printf("\n");
imxiic_setspeed(sc, sc->sc_bitrate);
imxiic_enable(sc, 0);
sc->stopped = 1;
rw_init(&sc->sc_buslock, sc->sc_dev.dv_xname);
sc->i2c_tag.ic_cookie = sc;
sc->i2c_tag.ic_acquire_bus = imxiic_i2c_acquire_bus;
sc->i2c_tag.ic_release_bus = imxiic_i2c_release_bus;
sc->i2c_tag.ic_exec = imxiic_i2c_exec;
bzero(&iba, sizeof iba);
iba.iba_name = "iic";
iba.iba_tag = &sc->i2c_tag;
iba.iba_bus_scan = imxiic_acpi_bus_scan;
iba.iba_bus_scan_arg = sc;
config_found(&sc->sc_dev, &iba, iicbus_print);
#ifndef SMALL_KERNEL
ac->ac_devnode->i2c = &sc->i2c_tag;
acpi_register_gsb(ac->ac_acpi, ac->ac_devnode);
#endif
}
int
imxiic_acpi_parse_crs(int crsidx, union acpi_resource *crs, void *arg)
{
struct imxiic_crs *sc_crs = arg;
switch (AML_CRSTYPE(crs)) {
case LR_SERBUS:
if (crs->lr_serbus.type == LR_SERBUS_I2C)
sc_crs->i2c_addr = crs->lr_i2cbus._adr;
break;
case SR_IRQ:
case LR_EXTIRQ:
case LR_MEM32:
case LR_MEM32FIXED:
break;
default:
printf("%s: unknown resource type %d\n", __func__,
AML_CRSTYPE(crs));
}
return 0;
}
void
imxiic_acpi_bus_scan(struct device *iic, struct i2cbus_attach_args *iba,
void *aux)
{
struct imxiic_acpi_softc *ac = (struct imxiic_acpi_softc *)aux;
ac->ac_iic = iic;
aml_find_node(ac->ac_devnode, "_HID", imxiic_acpi_found_hid, ac);
}
int
imxiic_acpi_found_hid(struct aml_node *node, void *arg)
{
struct imxiic_acpi_softc *ac = (struct imxiic_acpi_softc *)arg;
struct imxiic_softc *sc = &ac->ac_sc;
struct imxiic_crs crs;
struct aml_value res;
int64_t sta;
char cdev[16], dev[16];
struct i2c_attach_args ia;
/* Skip our own _HID. */
if (node->parent == ac->ac_devnode)
return 0;
/* Only direct descendants, because of possible muxes. */
if (node->parent && node->parent->parent != ac->ac_devnode)
return 0;
if (acpi_parsehid(node, arg, cdev, dev, 16) != 0)
return 0;
sta = acpi_getsta(acpi_softc, node->parent);
if ((sta & STA_PRESENT) == 0)
return 0;
if (aml_evalname(acpi_softc, node->parent, "_CRS", 0, NULL, &res))
return 0;
if (res.type != AML_OBJTYPE_BUFFER || res.length < 5) {
printf("%s: invalid _CRS object (type %d len %d)\n",
sc->sc_dev.dv_xname, res.type, res.length);
aml_freevalue(&res);
return (0);
}
memset(&crs, 0, sizeof(crs));
crs.devnode = ac->ac_devnode;
aml_parse_resource(&res, imxiic_acpi_parse_crs, &crs);
aml_freevalue(&res);
acpi_attach_deps(acpi_softc, node->parent);
memset(&ia, 0, sizeof(ia));
ia.ia_tag = &sc->i2c_tag;
ia.ia_name = dev;
ia.ia_addr = crs.i2c_addr;
ia.ia_cookie = node->parent;
config_found(ac->ac_iic, &ia, iicbus_print);
node->parent->attached = 1;
return 0;
}
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