/* $NetBSD: ns8250_uart.c,v 1.7 2021/01/27 03:10:21 thorpej Exp $ */
/*-
* Copyright (c) 2017-2020 Jared McNeill <
[email protected]>
* All rights reserved.
*
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(1, "$NetBSD: ns8250_uart.c,v 1.7 2021/01/27 03:10:21 thorpej Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/termios.h>
#include <dev/ic/comvar.h>
#include <dev/fdt/fdtvar.h>
static int ns8250_uart_match(device_t, cfdata_t, void *);
static void ns8250_uart_attach(device_t, device_t, void *);
struct ns8250_config {
int type;
int (*enable)(struct com_softc *);
void (*disable)(struct com_softc *);
};
static const struct ns8250_config ns8250_config = {
.type = COM_TYPE_NORMAL,
};
static const struct ns8250_config ns16750_config = {
.type = COM_TYPE_16750,
};
#define NS8250_OCTEON_USR_REG 0x0138
static int
ns8250_octeon_enable(struct com_softc *sc)
{
struct com_regs *regsp = &sc->sc_regs;
/* XXX Clear old busy detect interrupts */
bus_space_read_1(regsp->cr_iot, regsp->cr_ioh, NS8250_OCTEON_USR_REG);
return 0;
}
static const struct ns8250_config octeon_config = {
.type = COM_TYPE_16550_NOERS,
.enable = ns8250_octeon_enable,
};
static const struct device_compatible_entry compat_data[] = {
{ .compat = "cavium,octeon-3860-uart", .data = &octeon_config },
{ .compat = "ns8250", .data = &ns8250_config },
{ .compat = "ns16450", .data = &ns8250_config },
{ .compat = "ns16550a", .data = &ns8250_config },
{ .compat = "ns16550", .data = &ns8250_config },
{ .compat = "ns16750", .data = &ns16750_config },
DEVICE_COMPAT_EOL
};
CFATTACH_DECL_NEW(ns8250_uart, sizeof(struct com_softc),
ns8250_uart_match, ns8250_uart_attach, NULL, NULL);
static int
ns8250_uart_match(device_t parent, cfdata_t cf, void *aux)
{
struct fdt_attach_args * const faa = aux;
return of_compatible_match(faa->faa_phandle, compat_data);
}
static void
ns8250_uart_attach(device_t parent, device_t self, void *aux)
{
struct com_softc * const sc = device_private(self);
struct fdt_attach_args * const faa = aux;
const int phandle = faa->faa_phandle;
bus_space_tag_t bst = faa->faa_bst;
bus_space_handle_t bsh;
char intrstr[128];
struct clk *clk;
bus_addr_t addr;
bus_size_t size;
u_int reg_shift;
int error;
void *ih;
const struct ns8250_config *config =
of_compatible_lookup(phandle, compat_data)->data;
if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
aprint_error(": couldn't get registers\n");
return;
}
if (of_getprop_uint32(phandle, "reg-shift", ®_shift)) {
/* missing or bad reg-shift property, assume 0 */
reg_shift = 0;
}
sc->sc_dev = self;
if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency)) {
clk = fdtbus_clock_get_index(phandle, 0);
if (clk != NULL)
sc->sc_frequency = clk_get_rate(clk);
}
if (sc->sc_frequency == 0) {
aprint_error(": couldn't get frequency\n");
return;
}
sc->sc_type = config->type;
sc->enable = config->enable;
sc->disable = config->disable;
error = bus_space_map(bst, addr, size, 0, &bsh);
if (error) {
aprint_error(": couldn't map %#" PRIx64 ": %d",
(uint64_t)addr, error);
return;
}
com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, reg_shift);
if (config->enable != NULL) {
sc->enable(sc);
sc->enabled = 1;
}
com_attach_subr(sc);
if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
aprint_error_dev(self, "failed to decode interrupt\n");
return;
}
ih = fdtbus_intr_establish_xname(faa->faa_phandle, 0, IPL_SERIAL,
FDT_INTR_MPSAFE, comintr, sc, device_xname(self));
if (ih == NULL) {
aprint_error_dev(self, "failed to establish interrupt on %s\n",
intrstr);
return;
}
aprint_normal_dev(self, "interrupting on %s\n", intrstr);
}
/*
* Console support
*/
static int
ns8250_uart_console_match(int phandle)
{
return of_compatible_match(phandle, compat_data);
}
static void
ns8250_uart_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
{
const int phandle = faa->faa_phandle;
bus_space_tag_t bst = faa->faa_bst;
bus_space_handle_t dummy_bsh;
struct com_regs regs;
bus_addr_t addr;
tcflag_t flags;
u_int reg_shift;
int speed;
const struct ns8250_config *config =
of_compatible_lookup(phandle, compat_data)->data;
fdtbus_get_reg(phandle, 0, &addr, NULL);
speed = fdtbus_get_stdout_speed();
if (speed < 0)
speed = 115200; /* default */
flags = fdtbus_get_stdout_flags();
if (of_getprop_uint32(phandle, "reg-shift", ®_shift)) {
/* missing or bad reg-shift property, assume 0 */
reg_shift = 0;
}
memset(&dummy_bsh, 0, sizeof(dummy_bsh));
com_init_regs_stride(®s, bst, dummy_bsh, addr, reg_shift);
if (comcnattach1(®s, speed, uart_freq, config->type, flags))
panic("Cannot initialize ns8250 console");
}
static const struct fdt_console ns8250_uart_console = {
.match = ns8250_uart_console_match,
.consinit = ns8250_uart_console_consinit,
};
FDT_CONSOLE(ns8250_uart, &ns8250_uart_console);