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/* $OpenBSD: com_fdt.c,v 1.3 2018/08/06 10:52:30 patrick Exp $ */
/*
* Copyright (c) 2016 Patrick Wildt <patrick@blueri.se>
*
* 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/systm.h>
#include <sys/device.h>
#include <sys/tty.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#include <dev/cons.h>
#include <dev/ofw/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_pinctrl.h>
#define com_usr 31 /* Synopsys DesignWare UART */
int com_fdt_match(struct device *, void *, void *);
void com_fdt_attach(struct device *, struct device *, void *);
int com_fdt_intr_designware(void *);
struct cfattach com_fdt_ca = {
sizeof (struct com_softc), com_fdt_match, com_fdt_attach
};
struct consdev com_fdt_cons = {
NULL, NULL, comcngetc, comcnputc, comcnpollc, NULL,
NODEV, CN_LOWPRI
};
void
com_fdt_init_cons(void)
{
struct fdt_reg reg;
void *node;
if ((node = fdt_find_cons("brcm,bcm2835-aux-uart")) == NULL &&
(node = fdt_find_cons("snps,dw-apb-uart")) == NULL &&
(node = fdt_find_cons("marvell,armada-38x-uart")) == NULL &&
(node = fdt_find_cons("ti,omap3-uart")) == NULL &&
(node = fdt_find_cons("ti,omap4-uart")) == NULL)
return;
if (fdt_get_reg(node, 0, ®))
return;
/*
* Figuring out the clock frequency is rather complicated as
* on many SoCs this requires traversing a fair amount of the
* clock tree. Instead we rely on the firmware to set up the
* console for us and bypass the cominit() call that
* comcnattach() does by doing the minimal setup here.
*/
comcons_reg_width = OF_getpropint(stdout_node, "reg-io-width", 4);
comcons_reg_shift = OF_getpropint(stdout_node, "reg-shift", 2);
comconsiot = fdt_cons_bs_tag;
if (bus_space_map(comconsiot, reg.addr, reg.size, 0, &comconsioh))
return;
cn_tab = &com_fdt_cons;
}
int
com_fdt_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "brcm,bcm2835-aux-uart") ||
OF_is_compatible(faa->fa_node, "snps,dw-apb-uart") ||
OF_is_compatible(faa->fa_node, "marvell,armada-38x-uart") ||
OF_is_compatible(faa->fa_node, "ti,omap3-uart") ||
OF_is_compatible(faa->fa_node, "ti,omap4-uart"));
}
void
com_fdt_attach(struct device *parent, struct device *self, void *aux)
{
struct com_softc *sc = (struct com_softc *)self;
struct fdt_attach_args *faa = aux;
int (*intr)(void *) = comintr;
uint32_t freq;
if (faa->fa_nreg < 1)
return;
clock_enable(faa->fa_node, NULL);
/*
* Determine the clock frequency after enabling the clock.
* This gives the clock code a chance to configure the
* appropriate frequency for us.
*/
freq = OF_getpropint(faa->fa_node, "clock-frequency", 0);
if (freq == 0)
freq = clock_get_frequency(faa->fa_node, NULL);
sc->sc_iot = faa->fa_iot;
sc->sc_iobase = faa->fa_reg[0].addr;
sc->sc_uarttype = COM_UART_16550;
sc->sc_frequency = freq ? freq : COM_FREQ;
sc->sc_reg_width = OF_getpropint(faa->fa_node, "reg-io-width", 4);
sc->sc_reg_shift = OF_getpropint(faa->fa_node, "reg-shift", 2);
if (OF_is_compatible(faa->fa_node, "snps,dw-apb-uart") ||
OF_is_compatible(faa->fa_node, "marvell,armada-38x-uart"))
intr = com_fdt_intr_designware;
if (OF_is_compatible(faa->fa_node, "ti,omap3-uart") ||
OF_is_compatible(faa->fa_node, "ti,omap4-uart"))
sc->sc_uarttype = COM_UART_TI16750;
if (stdout_node == faa->fa_node) {
SET(sc->sc_hwflags, COM_HW_CONSOLE);
SET(sc->sc_swflags, COM_SW_SOFTCAR);
comconsfreq = sc->sc_frequency;
comconsrate = stdout_speed ? stdout_speed : B115200;
}
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf("%s: bus_space_map failed\n", __func__);
return;
}
pinctrl_byname(faa->fa_node, "default");
com_attach_subr(sc);
fdt_intr_establish(faa->fa_node, IPL_TTY, intr,
sc, sc->sc_dev.dv_xname);
}
int
com_fdt_intr_designware(void *cookie)
{
struct com_softc *sc = cookie;
com_read_reg(sc, com_usr);
return comintr(sc);
}
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