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/* $OpenBSD: com_acpi.c,v 1.1 2018/07/01 10:29:30 kettenis Exp $ */
/*
* Copyright (c) 2018 Mark Kettenis
*
* Permission to use, copy, modify, and 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/malloc.h>
#include <sys/systm.h>
#include <sys/tty.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>
#undef DEVNAME
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#include <dev/cons.h>
#define com_usr 31 /* Synopsys DesignWare UART */
struct com_acpi_softc {
struct com_softc sc;
struct acpi_softc *sc_acpi;
struct aml_node *sc_node;
bus_addr_t sc_addr;
bus_size_t sc_size;
int sc_irq;
int sc_irq_flags;
void *sc_ih;
};
int com_acpi_match(struct device *, void *, void *);
void com_acpi_attach(struct device *, struct device *, void *);
struct cfattach com_acpi_ca = {
sizeof(struct com_acpi_softc), com_acpi_match, com_acpi_attach
};
const char *com_hids[] = {
"HISI0031",
NULL
};
int com_acpi_parse_resources(int, union acpi_resource *, void *);
int com_acpi_is_console(struct com_acpi_softc *);
int com_acpi_intr_designware(void *);
int
com_acpi_match(struct device *parent, void *match, void *aux)
{
struct acpi_attach_args *aaa = aux;
struct cfdata *cf = match;
return acpi_matchhids(aaa, com_hids, cf->cf_driver->cd_name);
}
void
com_acpi_attach(struct device *parent, struct device *self, void *aux)
{
struct acpi_attach_args *aaa = aux;
struct com_acpi_softc *sc = (struct com_acpi_softc *)self;
struct aml_value res;
uint32_t freq;
sc->sc_acpi = (struct acpi_softc *)parent;
sc->sc_node = aaa->aaa_node;
printf(" %s", sc->sc_node->name);
if (aml_evalname(sc->sc_acpi, sc->sc_node, "_CRS", 0, NULL, &res)) {
printf(": can't find registers\n");
return;
}
aml_parse_resource(&res, com_acpi_parse_resources, sc);
printf(" addr 0x%lx/0x%lx", sc->sc_addr, sc->sc_size);
if (sc->sc_addr == 0 || sc->sc_size == 0) {
printf("\n");
return;
}
printf(" irq %d", sc->sc_irq);
freq = acpi_getpropint(sc->sc_node, "clock-frequency", 0);
sc->sc.sc_iot = aaa->aaa_memt;
sc->sc.sc_iobase = sc->sc_addr;
sc->sc.sc_uarttype = COM_UART_16550;
sc->sc.sc_frequency = freq ? freq : COM_FREQ;
sc->sc.sc_reg_width = acpi_getpropint(sc->sc_node, "reg-io-width", 4);
sc->sc.sc_reg_shift = acpi_getpropint(sc->sc_node, "reg-shift", 2);
if (com_acpi_is_console(sc)) {
SET(sc->sc.sc_hwflags, COM_HW_CONSOLE);
SET(sc->sc.sc_swflags, COM_SW_SOFTCAR);
comconsfreq = sc->sc.sc_frequency;
comconsrate = B115200;
}
if (bus_space_map(sc->sc.sc_iot, sc->sc_addr, sc->sc_size, 0,
&sc->sc.sc_ioh)) {
printf(": can't map registers\n");
return;
}
sc->sc_ih = acpi_intr_establish(sc->sc_irq, sc->sc_irq_flags, IPL_TTY,
com_acpi_intr_designware, sc, sc->sc.sc_dev.dv_xname);
if (sc->sc_ih == NULL) {
printf(": can't establish interrupt\n");
return;
}
com_attach_subr(&sc->sc);
}
int
com_acpi_parse_resources(int crsidx, union acpi_resource *crs, void *arg)
{
struct com_acpi_softc *sc = arg;
int type = AML_CRSTYPE(crs);
switch (type) {
case LR_MEM32FIXED:
sc->sc_addr = crs->lr_m32fixed._bas;
sc->sc_size = crs->lr_m32fixed._len;
break;
case LR_EXTIRQ:
sc->sc_irq = crs->lr_extirq.irq[0];
sc->sc_irq_flags = crs->lr_extirq.flags;
break;
}
return 0;
}
int
com_acpi_is_console(struct com_acpi_softc *sc)
{
struct acpi_table_header *hdr;
struct acpi_spcr *spcr;
struct acpi_gas *base;
struct acpi_q *entry;
SIMPLEQ_FOREACH(entry, &sc->sc_acpi->sc_tables, q_next) {
hdr = entry->q_table;
if (strncmp(hdr->signature, SPCR_SIG,
sizeof(hdr->signature)) == 0) {
spcr = entry->q_table;
base = &spcr->base_address;
if (base->address_space_id == GAS_SYSTEM_MEMORY &&
base->address == sc->sc_addr)
return 1;
}
}
return 0;
}
int
com_acpi_intr_designware(void *cookie)
{
struct com_softc *sc = cookie;
com_read_reg(sc, com_usr);
return comintr(sc);
}
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