Home | History | Annotate | Line # | Download | only in gemini
      1 /*	$NetBSD: lpc_com.c,v 1.5 2018/12/08 17:46:09 thorpej Exp $	*/
      2 
      3 /* adapted from:
      4  *	NetBSD: gemini_com.c,v 1.1 2008/10/24 04:23:18 matt Exp
      5  */
      6 
      7 /*
      8  * Based on arch/arm/xscale/pxa2x0_com.c
      9  *
     10  * Copyright 2003 Wasabi Systems, Inc.
     11  * All rights reserved.
     12  *
     13  * Written by Steve C. Woodford for Wasabi Systems, Inc.
     14  *
     15  * Redistribution and use in source and binary forms, with or without
     16  * modification, are permitted provided that the following conditions
     17  * are met:
     18  * 1. Redistributions of source code must retain the above copyright
     19  *    notice, this list of conditions and the following disclaimer.
     20  * 2. Redistributions in binary form must reproduce the above copyright
     21  *    notice, this list of conditions and the following disclaimer in the
     22  *    documentation and/or other materials provided with the distribution.
     23  * 3. All advertising materials mentioning features or use of this software
     24  *    must display the following acknowledgement:
     25  *      This product includes software developed for the NetBSD Project by
     26  *      Wasabi Systems, Inc.
     27  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     28  *    or promote products derived from this software without specific prior
     29  *    written permission.
     30  *
     31  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     33  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     34  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     35  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     38  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     39  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     41  * POSSIBILITY OF SUCH DAMAGE.
     42  */
     43 
     44 #include <sys/cdefs.h>
     45 __KERNEL_RCSID(0, "$NetBSD: lpc_com.c,v 1.5 2018/12/08 17:46:09 thorpej Exp $");
     46 
     47 #include "opt_com.h"
     48 #include "locators.h"
     49 
     50 #include <sys/param.h>
     51 #include <sys/systm.h>
     52 #include <sys/device.h>
     53 #include <sys/termios.h>
     54 #include <sys/callout.h>
     55 #include <sys/kernel.h>
     56 
     57 #include <machine/intr.h>
     58 #include <sys/bus.h>
     59 
     60 #include <dev/ic/comreg.h>
     61 #include <dev/ic/comvar.h>
     62 
     63 #include <arm/gemini/gemini_obiovar.h>
     64 #include <arm/gemini/gemini_lpchcvar.h>
     65 #include <arm/gemini/gemini_lpcvar.h>
     66 #include <arm/gemini/gemini_reg.h>
     67 
     68 #include <arm/gemini/lpc_com.h>
     69 
     70 typedef struct lpc_com_softc {
     71 	struct com_softc	sc_com;
     72 	bus_addr_t		sc_addr;
     73 	bus_size_t		sc_size;
     74 	int			sc_intr;
     75 	bus_space_tag_t		sc_iot;
     76 	bus_space_handle_t	sc_ioh;
     77 	struct callout		sc_callout;
     78 } lpc_com_softc_t;
     79 
     80 static int	lpc_com_match(device_t, cfdata_t , void *);
     81 static void	lpc_com_attach(device_t, device_t, void *);
     82 static int	lpc_com_intr(void *);
     83 static void	lpc_com_time(void *);
     84 
     85 CFATTACH_DECL_NEW(lpc_com, sizeof(struct lpc_com_softc),
     86     lpc_com_match, lpc_com_attach, NULL, NULL);
     87 
     88 static int
     89 lpc_com_match(device_t parent, cfdata_t cf, void *aux)
     90 {
     91 	struct gemini_lpc_attach_args *lpc = aux;
     92 	lpctag_t lpctag;
     93 	bus_space_tag_t iot;
     94 	bus_space_handle_t ioh;
     95 	bus_addr_t iobase;
     96 	int rv;
     97 
     98 	if (lpc->lpc_addr == LPCCF_LDN_DEFAULT
     99 	||  lpc->lpc_addr == LPCCF_ADDR_DEFAULT)
    100 		panic("lpc_com must have ldn and addr"
    101 			" in config.");
    102 
    103 	if ((lpc->lpc_intr != LPCCF_INTR_DEFAULT) && (lpc->lpc_intr > 0xff))
    104 		panic("lpc_com: bad intr %d", lpc->lpc_intr);
    105 
    106 	if (lpc->lpc_size == LPCCF_SIZE_DEFAULT)
    107 		lpc->lpc_size = IT8712F_UART_SIZE;
    108 
    109 	iobase = lpc->lpc_base + lpc->lpc_addr;
    110 	if (com_is_console(lpc->lpc_iot, iobase, NULL))
    111 		return 1;
    112 
    113 	lpctag = lpc->lpc_tag;
    114 
    115 	lpc_pnp_enter(lpctag);
    116 
    117 	/* Activate */
    118 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x30, 0x01);
    119 
    120 	/* Set address */
    121 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x60,
    122 		(lpc->lpc_addr % 0xff00) >> 8);
    123 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x61,
    124 		(lpc->lpc_addr % 0x00ff) >> 0);
    125 
    126 	/* Set Interrupt Level */
    127 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x70, lpc->lpc_intr);
    128 
    129 	/* Set Special Configuration Regs */
    130 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf0, 0x00);
    131 #if 0
    132 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x50);
    133 #else
    134 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x58);	/* LO */
    135 #endif
    136 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf2, 0x00);
    137 	lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf3, 0x7f);
    138 
    139 	lpc_pnp_exit(lpctag);
    140 
    141 	iot = lpc->lpc_iot;
    142 	if (bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh))
    143 		return 0;
    144 
    145 	rv = comprobe1(iot, ioh);
    146 
    147 	bus_space_unmap(iot, ioh, lpc->lpc_size);
    148 
    149 	return rv;
    150 }
    151 
    152 static void
    153 lpc_com_attach(device_t parent, device_t self, void *aux)
    154 {
    155 	struct lpc_com_softc *sc = device_private(self);
    156 	struct gemini_lpc_attach_args *lpc = aux;
    157 	bus_space_tag_t iot;
    158 	bus_space_handle_t ioh;
    159 	bus_addr_t iobase;
    160 
    161 	sc->sc_com.sc_dev = self;
    162 	iot = lpc->lpc_iot;
    163 	iobase = lpc->lpc_base + lpc->lpc_addr;
    164 	sc->sc_com.sc_frequency = IT8712F_COM_FREQ;
    165 	sc->sc_com.sc_type = COM_TYPE_NORMAL;
    166 
    167 	if (com_is_console(iot, iobase, &ioh) == 0 &&
    168 	    bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh)) {
    169 		panic(": can't map registers\n");
    170 		return;
    171 	}
    172 
    173 	com_init_regs(&sc->sc_com.sc_regs, iot, ioh, iobase);
    174 
    175 	com_attach_subr(&sc->sc_com);
    176 	aprint_naive("\n");
    177 
    178 	if (lpc->lpc_intr == LPCCF_INTR_DEFAULT) {
    179 		/* callout based polliung */
    180 		callout_init(&sc->sc_callout, 0);
    181 		callout_setfunc(&sc->sc_callout, lpc_com_time, sc);
    182 		callout_schedule(&sc->sc_callout, hz/16);
    183 		aprint_normal("%s: callout polling mode\n", device_xname(self));
    184 	} else {
    185 		/* interrupting */
    186 #if 0
    187 		lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
    188 			IPL_SERIAL, IST_LEVEL_HIGH, comintr, &sc->sc_com);
    189 #else
    190 		lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
    191 			IPL_SERIAL, IST_LEVEL_LOW, lpc_com_intr, &sc->sc_com);
    192 #endif
    193 	}
    194 }
    195 
    196 int
    197 lpc_com_intr(void *arg)
    198 {
    199 	printf(".");
    200 	return comintr(arg);
    201 }
    202 
    203 void
    204 lpc_com_time(void *arg)
    205 {
    206 	lpc_com_softc_t *sc = arg;
    207 	int s;
    208 
    209 	s = splserial();
    210 	(void)comintr(&sc->sc_com);
    211 	callout_schedule(&sc->sc_callout, hz/16);
    212 	splx(s);
    213 }
    214