diff options
Diffstat (limited to 'sys/dev/uart/uart_cpu_fdt.c')
| -rw-r--r-- | sys/dev/uart/uart_cpu_fdt.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sys/dev/uart/uart_cpu_fdt.c b/sys/dev/uart/uart_cpu_fdt.c new file mode 100644 index 0000000..52d5f00 --- /dev/null +++ b/sys/dev/uart/uart_cpu_fdt.c @@ -0,0 +1,175 @@ +/*- + * Copyright (c) 2009-2010 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Semihalf under sponsorship from + * the FreeBSD Foundation. + * + * 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 AUTHOR 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 AUTHOR 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> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> + +#include <machine/bus.h> +#include <machine/fdt.h> + +#include <dev/fdt/fdt_common.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> +#include <dev/uart/uart.h> +#include <dev/uart/uart_bus.h> +#include <dev/uart/uart_cpu.h> + +/* + * UART console routines. + */ +bus_space_tag_t uart_bus_space_io; +bus_space_tag_t uart_bus_space_mem; + +static int +uart_fdt_get_clock(phandle_t node, pcell_t *cell) +{ + pcell_t clock; + + if ((OF_getprop(node, "clock-frequency", &clock, + sizeof(clock))) <= 0) + return (ENXIO); + + if (clock == 0) + /* Try to retrieve parent 'bus-frequency' */ + /* XXX this should go to simple-bus fixup or so */ + if ((OF_getprop(OF_parent(node), "bus-frequency", &clock, + sizeof(clock))) <= 0) + clock = 0; + + *cell = fdt32_to_cpu(clock); + return (0); +} + +static int +uart_fdt_get_shift(phandle_t node, pcell_t *cell) +{ + pcell_t shift; + + if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) + shift = 0; + *cell = fdt32_to_cpu(shift); + return (0); +} + +int +uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) +{ + + return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); +} + +int +uart_cpu_getdev(int devtype, struct uart_devinfo *di) +{ + char buf[64]; + struct uart_class *class; + phandle_t node, chosen; + pcell_t shift, br, rclk; + u_long start, size, pbase, psize; + int err; + + uart_bus_space_mem = fdtbus_bs_tag; + uart_bus_space_io = NULL; + + /* Allow overriding the FDT uning the environment. */ + class = &uart_ns8250_class; + err = uart_getenv(devtype, di, class); + if (!err) + return (0); + + if (devtype != UART_DEV_CONSOLE) + return (ENXIO); + + /* + * Retrieve /chosen/std{in,out}. + */ + if ((chosen = OF_finddevice("/chosen")) == -1) + return (ENXIO); + if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0) + return (ENXIO); + if ((node = OF_finddevice(buf)) == -1) + return (ENXIO); + if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0) + return (ENXIO); + if (OF_finddevice(buf) != node) + /* Only stdin == stdout is supported. */ + return (ENXIO); + /* + * Retrieve serial attributes. + */ + uart_fdt_get_shift(node, &shift); + + if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) + br = 0; + br = fdt32_to_cpu(br); + + if ((err = uart_fdt_get_clock(node, &rclk)) != 0) + return (err); + /* + * Finalize configuration. + */ + if (fdt_is_compatible(node, "fsl,imx-uart")) + class = &uart_imx_class; + if (fdt_is_compatible(node, "quicc")) + class = &uart_quicc_class; + if (fdt_is_compatible(node, "lpc")) + class = &uart_lpc_class; + if (fdt_is_compatible(node, "ns16550")) + class = &uart_ns8250_class; + if (fdt_is_compatible(node, "arm,pl011")) + class = &uart_pl011_class; + if (fdt_is_compatible(node, "cadence,uart")) + class = &uart_cdnc_class; + + di->bas.chan = 0; + di->bas.regshft = (u_int)shift; + di->baudrate = br; + di->bas.rclk = (u_int)rclk; + di->ops = uart_getops(class); + di->databits = 8; + di->stopbits = 1; + di->parity = UART_PARITY_NONE; + di->bas.bst = uart_bus_space_mem; + + err = fdt_regsize(node, &start, &size); + if (err) + return (ENXIO); + err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); + if (err) + pbase = 0; + + start += pbase; + + return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); +} |
