diff options
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/fdt/com_fdt.c | 160 | ||||
| -rw-r--r-- | sys/dev/fdt/files.fdt | 5 |
2 files changed, 164 insertions, 1 deletions
diff --git a/sys/dev/fdt/com_fdt.c b/sys/dev/fdt/com_fdt.c new file mode 100644 index 00000000000..5ab6077672c --- /dev/null +++ b/sys/dev/fdt/com_fdt.c @@ -0,0 +1,160 @@ +/* $OpenBSD: com_fdt.c,v 1.1 2018/05/31 20:03:18 kettenis 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("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, "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")) + 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); + + arm_intr_establish_fdt(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); +} diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt index 4a1d9a472ed..e1e9ceb209b 100644 --- a/sys/dev/fdt/files.fdt +++ b/sys/dev/fdt/files.fdt @@ -1,4 +1,4 @@ -# $OpenBSD: files.fdt,v 1.60 2018/05/16 13:21:50 patrick Exp $ +# $OpenBSD: files.fdt,v 1.61 2018/05/31 20:03:18 kettenis Exp $ # # Config file and device description for machine-independent FDT code. # Included by ports that need it. @@ -240,3 +240,6 @@ file dev/fdt/if_fec.c fec attach ccp at fdt with ccp_fdt file dev/fdt/ccp_fdt.c ccp_fdt + +attach com at fdt with com_fdt +file dev/fdt/com_fdt.c com_fdt |