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tegra_com.c revision 1.8.8.2
      1  1.8.8.2  jdolecek /* $NetBSD: tegra_com.c,v 1.8.8.2 2017/12/03 11:35:54 jdolecek Exp $ */
      2  1.8.8.2  jdolecek 
      3  1.8.8.2  jdolecek /*-
      4  1.8.8.2  jdolecek  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  1.8.8.2  jdolecek  * All rights reserved.
      6  1.8.8.2  jdolecek  *
      7  1.8.8.2  jdolecek  * This code is derived from software contributed to The NetBSD Foundation
      8  1.8.8.2  jdolecek  * by Matt Thomas of 3am Software Foundry.
      9  1.8.8.2  jdolecek  *
     10  1.8.8.2  jdolecek  * Redistribution and use in source and binary forms, with or without
     11  1.8.8.2  jdolecek  * modification, are permitted provided that the following conditions
     12  1.8.8.2  jdolecek  * are met:
     13  1.8.8.2  jdolecek  * 1. Redistributions of source code must retain the above copyright
     14  1.8.8.2  jdolecek  *    notice, this list of conditions and the following disclaimer.
     15  1.8.8.2  jdolecek  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.8.8.2  jdolecek  *    notice, this list of conditions and the following disclaimer in the
     17  1.8.8.2  jdolecek  *    documentation and/or other materials provided with the distribution.
     18  1.8.8.2  jdolecek  *
     19  1.8.8.2  jdolecek  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.8.8.2  jdolecek  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.8.8.2  jdolecek  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.8.8.2  jdolecek  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.8.8.2  jdolecek  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.8.8.2  jdolecek  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.8.8.2  jdolecek  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.8.8.2  jdolecek  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.8.8.2  jdolecek  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.8.8.2  jdolecek  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.8.8.2  jdolecek  * POSSIBILITY OF SUCH DAMAGE.
     30  1.8.8.2  jdolecek  */
     31  1.8.8.2  jdolecek 
     32  1.8.8.2  jdolecek #include <sys/cdefs.h>
     33  1.8.8.2  jdolecek 
     34  1.8.8.2  jdolecek __KERNEL_RCSID(1, "$NetBSD: tegra_com.c,v 1.8.8.2 2017/12/03 11:35:54 jdolecek Exp $");
     35  1.8.8.2  jdolecek 
     36  1.8.8.2  jdolecek #include <sys/param.h>
     37  1.8.8.2  jdolecek #include <sys/bus.h>
     38  1.8.8.2  jdolecek #include <sys/device.h>
     39  1.8.8.2  jdolecek #include <sys/intr.h>
     40  1.8.8.2  jdolecek #include <sys/systm.h>
     41  1.8.8.2  jdolecek #include <sys/time.h>
     42  1.8.8.2  jdolecek #include <sys/termios.h>
     43  1.8.8.2  jdolecek 
     44  1.8.8.2  jdolecek #include <arm/nvidia/tegra_reg.h>
     45  1.8.8.2  jdolecek #include <arm/nvidia/tegra_var.h>
     46  1.8.8.2  jdolecek 
     47  1.8.8.2  jdolecek #include <dev/ic/comvar.h>
     48  1.8.8.2  jdolecek 
     49  1.8.8.2  jdolecek #include <dev/fdt/fdtvar.h>
     50  1.8.8.2  jdolecek 
     51  1.8.8.2  jdolecek static int tegra_com_match(device_t, cfdata_t, void *);
     52  1.8.8.2  jdolecek static void tegra_com_attach(device_t, device_t, void *);
     53  1.8.8.2  jdolecek 
     54  1.8.8.2  jdolecek static const char * const compatible[] = {
     55  1.8.8.2  jdolecek 	"nvidia,tegra210-uart",
     56  1.8.8.2  jdolecek 	"nvidia,tegra124-uart",
     57  1.8.8.2  jdolecek 	"nvidia,tegra20-uart",
     58  1.8.8.2  jdolecek 	NULL
     59  1.8.8.2  jdolecek };
     60  1.8.8.2  jdolecek 
     61  1.8.8.2  jdolecek struct tegra_com_softc {
     62  1.8.8.2  jdolecek 	struct com_softc tsc_sc;
     63  1.8.8.2  jdolecek 	void *tsc_ih;
     64  1.8.8.2  jdolecek 
     65  1.8.8.2  jdolecek 	struct clk *tsc_clk;
     66  1.8.8.2  jdolecek 	struct fdtbus_reset *tsc_rst;
     67  1.8.8.2  jdolecek };
     68  1.8.8.2  jdolecek 
     69  1.8.8.2  jdolecek CFATTACH_DECL_NEW(tegra_com, sizeof(struct tegra_com_softc),
     70  1.8.8.2  jdolecek 	tegra_com_match, tegra_com_attach, NULL, NULL);
     71  1.8.8.2  jdolecek 
     72  1.8.8.2  jdolecek static int
     73  1.8.8.2  jdolecek tegra_com_match(device_t parent, cfdata_t cf, void *aux)
     74  1.8.8.2  jdolecek {
     75  1.8.8.2  jdolecek 	struct fdt_attach_args * const faa = aux;
     76  1.8.8.2  jdolecek 
     77  1.8.8.2  jdolecek 	return of_match_compatible(faa->faa_phandle, compatible);
     78  1.8.8.2  jdolecek }
     79  1.8.8.2  jdolecek 
     80  1.8.8.2  jdolecek static void
     81  1.8.8.2  jdolecek tegra_com_attach(device_t parent, device_t self, void *aux)
     82  1.8.8.2  jdolecek {
     83  1.8.8.2  jdolecek 	struct tegra_com_softc * const tsc = device_private(self);
     84  1.8.8.2  jdolecek 	struct com_softc * const sc = &tsc->tsc_sc;
     85  1.8.8.2  jdolecek 	struct fdt_attach_args * const faa = aux;
     86  1.8.8.2  jdolecek 	bus_space_handle_t bsh;
     87  1.8.8.2  jdolecek 	bus_space_tag_t bst;
     88  1.8.8.2  jdolecek 	char intrstr[128];
     89  1.8.8.2  jdolecek 	bus_addr_t addr;
     90  1.8.8.2  jdolecek 	bus_size_t size;
     91  1.8.8.2  jdolecek 	u_int reg_shift;
     92  1.8.8.2  jdolecek 	int error;
     93  1.8.8.2  jdolecek 
     94  1.8.8.2  jdolecek 	if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) {
     95  1.8.8.2  jdolecek 		aprint_error(": couldn't get registers\n");
     96  1.8.8.2  jdolecek 		return;
     97  1.8.8.2  jdolecek 	}
     98  1.8.8.2  jdolecek 
     99  1.8.8.2  jdolecek 	if (of_getprop_uint32(faa->faa_phandle, "reg-shift", &reg_shift)) {
    100  1.8.8.2  jdolecek 		/* missing or bad reg-shift property, assume 2 */
    101  1.8.8.2  jdolecek 		bst = faa->faa_a4x_bst;
    102  1.8.8.2  jdolecek 	} else {
    103  1.8.8.2  jdolecek 		if (reg_shift == 2) {
    104  1.8.8.2  jdolecek 			bst = faa->faa_a4x_bst;
    105  1.8.8.2  jdolecek 		} else if (reg_shift == 0) {
    106  1.8.8.2  jdolecek 			bst = faa->faa_bst;
    107  1.8.8.2  jdolecek 		} else {
    108  1.8.8.2  jdolecek 			aprint_error(": unsupported reg-shift value %d\n",
    109  1.8.8.2  jdolecek 			    reg_shift);
    110  1.8.8.2  jdolecek 			return;
    111  1.8.8.2  jdolecek 		}
    112  1.8.8.2  jdolecek 	}
    113  1.8.8.2  jdolecek 
    114  1.8.8.2  jdolecek 	sc->sc_dev = self;
    115  1.8.8.2  jdolecek 
    116  1.8.8.2  jdolecek 	tsc->tsc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0);
    117  1.8.8.2  jdolecek 	tsc->tsc_rst = fdtbus_reset_get(faa->faa_phandle, "serial");
    118  1.8.8.2  jdolecek 
    119  1.8.8.2  jdolecek 	if (tsc->tsc_clk == NULL) {
    120  1.8.8.2  jdolecek 		aprint_error(": couldn't get frequency\n");
    121  1.8.8.2  jdolecek 		return;
    122  1.8.8.2  jdolecek 	}
    123  1.8.8.2  jdolecek 
    124  1.8.8.2  jdolecek 	sc->sc_frequency = clk_get_rate(tsc->tsc_clk);
    125  1.8.8.2  jdolecek 	sc->sc_type = COM_TYPE_TEGRA;
    126  1.8.8.2  jdolecek 
    127  1.8.8.2  jdolecek 	error = bus_space_map(bst, addr, size, 0, &bsh);
    128  1.8.8.2  jdolecek 	if (error) {
    129  1.8.8.2  jdolecek 		aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
    130  1.8.8.2  jdolecek 		return;
    131  1.8.8.2  jdolecek 	}
    132  1.8.8.2  jdolecek 
    133  1.8.8.2  jdolecek 	COM_INIT_REGS(sc->sc_regs, bst, bsh, addr);
    134  1.8.8.2  jdolecek 
    135  1.8.8.2  jdolecek 	com_attach_subr(sc);
    136  1.8.8.2  jdolecek 	aprint_naive("\n");
    137  1.8.8.2  jdolecek 
    138  1.8.8.2  jdolecek 	if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
    139  1.8.8.2  jdolecek 		aprint_error_dev(self, "failed to decode interrupt\n");
    140  1.8.8.2  jdolecek 		return;
    141  1.8.8.2  jdolecek 	}
    142  1.8.8.2  jdolecek 
    143  1.8.8.2  jdolecek 	tsc->tsc_ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_SERIAL,
    144  1.8.8.2  jdolecek 	    FDT_INTR_MPSAFE, comintr, sc);
    145  1.8.8.2  jdolecek 	if (tsc->tsc_ih == NULL) {
    146  1.8.8.2  jdolecek 		aprint_error_dev(self, "failed to establish interrupt on %s\n",
    147  1.8.8.2  jdolecek 		    intrstr);
    148  1.8.8.2  jdolecek 	}
    149  1.8.8.2  jdolecek 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    150  1.8.8.2  jdolecek }
    151  1.8.8.2  jdolecek 
    152  1.8.8.2  jdolecek /*
    153  1.8.8.2  jdolecek  * Console support
    154  1.8.8.2  jdolecek  */
    155  1.8.8.2  jdolecek 
    156  1.8.8.2  jdolecek static int
    157  1.8.8.2  jdolecek tegra_com_console_match(int phandle)
    158  1.8.8.2  jdolecek {
    159  1.8.8.2  jdolecek 	return of_match_compatible(phandle, compatible);
    160  1.8.8.2  jdolecek }
    161  1.8.8.2  jdolecek 
    162  1.8.8.2  jdolecek static void
    163  1.8.8.2  jdolecek tegra_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
    164  1.8.8.2  jdolecek {
    165  1.8.8.2  jdolecek 	const int phandle = faa->faa_phandle;
    166  1.8.8.2  jdolecek 	bus_space_tag_t bst = faa->faa_a4x_bst;
    167  1.8.8.2  jdolecek 	bus_addr_t addr;
    168  1.8.8.2  jdolecek 	tcflag_t flags;
    169  1.8.8.2  jdolecek 	int speed;
    170  1.8.8.2  jdolecek 
    171  1.8.8.2  jdolecek 	fdtbus_get_reg(phandle, 0, &addr, NULL);
    172  1.8.8.2  jdolecek 	speed = fdtbus_get_stdout_speed();
    173  1.8.8.2  jdolecek 	if (speed < 0)
    174  1.8.8.2  jdolecek 		speed = 115200;	/* default */
    175  1.8.8.2  jdolecek 	flags = fdtbus_get_stdout_flags();
    176  1.8.8.2  jdolecek 
    177  1.8.8.2  jdolecek 	if (comcnattach(bst, addr, speed, uart_freq, COM_TYPE_TEGRA, flags))
    178  1.8.8.2  jdolecek 		panic("Cannot initialize tegra com console");
    179  1.8.8.2  jdolecek }
    180  1.8.8.2  jdolecek 
    181  1.8.8.2  jdolecek static const struct fdt_console tegra_com_console = {
    182  1.8.8.2  jdolecek 	.match = tegra_com_console_match,
    183  1.8.8.2  jdolecek 	.consinit = tegra_com_console_consinit,
    184  1.8.8.2  jdolecek };
    185  1.8.8.2  jdolecek 
    186  1.8.8.2  jdolecek FDT_CONSOLE(tegra_com, &tegra_com_console);
    187