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xp.c revision 1.3 
      1 /* $NetBSD: xp.c,v 1.3 2017/01/08 16:41:35 tsutsui Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2016 Izumi Tsutsui.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 /*
     28  * LUNA's Hitachi HD647180 "XP" I/O processor driver
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: xp.c,v 1.3 2017/01/08 16:41:35 tsutsui Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/conf.h>
     37 #include <sys/device.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/kmem.h>
     40 #include <sys/errno.h>
     41 
     42 #include <uvm/uvm_extern.h>
     43 
     44 #include <machine/autoconf.h>
     45 #include <machine/xpio.h>
     46 
     47 #include "ioconf.h"
     48 
     49 #define XP_SHM_BASE	0x71000000
     50 #define XP_SHM_SIZE	0x00010000	/* 64KB for XP; rest 64KB for lance */
     51 #define XP_TAS_ADDR	0x61000000
     52 
     53 struct xp_softc {
     54 	device_t	sc_dev;
     55 
     56 	vaddr_t		sc_shm_base;
     57 	vsize_t		sc_shm_size;
     58 	vaddr_t		sc_tas;
     59 
     60 	bool		sc_isopen;
     61 };
     62 
     63 static int xp_match(device_t, cfdata_t, void *);
     64 static void xp_attach(device_t, device_t, void *);
     65 
     66 dev_type_open(xp_open);
     67 dev_type_close(xp_close);
     68 dev_type_read(xp_read);
     69 dev_type_write(xp_write);
     70 dev_type_ioctl(xp_ioctl);
     71 dev_type_mmap(xp_mmap);
     72 
     73 const struct cdevsw xp_cdevsw = {
     74 	.d_open     = xp_open,
     75 	.d_close    = xp_close,
     76 	.d_read     = xp_read,
     77 	.d_write    = xp_write,
     78 	.d_ioctl    = xp_ioctl,
     79 	.d_stop     = nostop,
     80 	.d_tty      = notty,
     81 	.d_poll     = nopoll,
     82 	.d_mmap     = xp_mmap,
     83 	.d_kqfilter = nokqfilter,
     84 	.d_discard  = nodiscard,
     85 	.d_flag     = 0
     86 };
     87 
     88 CFATTACH_DECL_NEW(xp, sizeof(struct xp_softc),
     89     xp_match, xp_attach, NULL, NULL);
     90 
     91 /* #define XP_DEBUG */
     92 
     93 #ifdef XP_DEBUG
     94 #define XP_DEBUG_ALL	0xff
     95 uint32_t xp_debug = 0;
     96 #define DPRINTF(x, y)	if (xp_debug & (x)) printf y
     97 #else
     98 #define DPRINTF(x, y)	/* nothing */
     99 #endif
    100 
    101 static bool xp_matched;
    102 
    103 /*
    104  * PIO 0 port C is connected to XP's reset line
    105  *
    106  * XXX: PIO port functions should be shared with machdep.c for DIP SWs
    107  */
    108 #define PIO_ADDR	0x49000000
    109 #define PORT_A		0
    110 #define PORT_B		1
    111 #define PORT_C		2
    112 #define CTRL		3
    113 
    114 /* PIO0 Port C bit definition */
    115 #define XP_INT1_REQ	0	/* INTR B */
    116 	/* unused */		/* IBF B */
    117 #define XP_INT1_ENA	2	/* INTE B */
    118 #define XP_INT5_REQ	3	/* INTR A */
    119 #define XP_INT5_ENA	4	/* INTE A */
    120 	/* unused */		/* IBF A */
    121 #define PARITY		6	/* PC6 output to enable parity error */
    122 #define XP_RESET	7	/* PC7 output to reset HD647180 XP */
    123 
    124 /* Port control for PC6 and PC7 */
    125 #define ON		1
    126 #define OFF		0
    127 
    128 static uint8_t put_pio0c(uint8_t bit, uint8_t set)
    129 {
    130 	volatile uint8_t * const pio0 = (uint8_t *)PIO_ADDR;
    131 
    132 	pio0[CTRL] = (bit << 1) | (set & 0x01);
    133 
    134 	return pio0[PORT_C];
    135 }
    136 
    137 static int
    138 xp_match(device_t parent, cfdata_t cf, void *aux)
    139 {
    140 	struct mainbus_attach_args *maa = aux;
    141 
    142 	/* only one XP processor */
    143 	if (xp_matched)
    144 		return 0;
    145 
    146 	if (strcmp(maa->ma_name, xp_cd.cd_name))
    147 		return 0;
    148 
    149 	if (maa->ma_addr != XP_SHM_BASE)
    150 		return 0;
    151 
    152 	xp_matched = true;
    153 	return 1;
    154 }
    155 
    156 static void
    157 xp_attach(device_t parent, device_t self, void *aux)
    158 {
    159 	struct xp_softc *sc = device_private(self);
    160 
    161 	sc->sc_dev = self;
    162 
    163 	aprint_normal(": HD647180X I/O processor\n");
    164 
    165 	sc->sc_shm_base = XP_SHM_BASE;
    166 	sc->sc_shm_size = XP_SHM_SIZE;
    167 	sc->sc_tas      = XP_TAS_ADDR;
    168 }
    169 
    170 int
    171 xp_open(dev_t dev, int flags, int devtype, struct lwp *l)
    172 {
    173 	struct xp_softc *sc;
    174 	int unit;
    175 
    176 	DPRINTF(XP_DEBUG_ALL, ("%s\n", __func__));
    177 
    178 	unit = minor(dev);
    179 	sc = device_lookup_private(&xp_cd, unit);
    180 	if (sc == NULL)
    181 		return ENXIO;
    182 	if (sc->sc_isopen)
    183 		return EBUSY;
    184 
    185 	sc->sc_isopen = true;
    186 
    187 	return 0;
    188 }
    189 
    190 int
    191 xp_close(dev_t dev, int flags, int mode, struct lwp *l)
    192 {
    193 	struct xp_softc *sc;
    194 	int unit;
    195 
    196 	DPRINTF(XP_DEBUG_ALL, ("%s\n", __func__));
    197 
    198 	unit = minor(dev);
    199 	sc = device_lookup_private(&xp_cd, unit);
    200 	sc->sc_isopen = false;
    201 
    202 	return 0;
    203 }
    204 
    205 int
    206 xp_ioctl(dev_t dev, u_long cmd, void *addr, int flags, struct lwp *l)
    207 {
    208 	struct xp_softc *sc;
    209 	int unit, error;
    210 	struct xp_download *downld;
    211 	uint8_t *loadbuf;
    212 	size_t loadsize;
    213 
    214 	DPRINTF(XP_DEBUG_ALL, ("%s\n", __func__));
    215 
    216 	unit = minor(dev);
    217 	sc = device_lookup_private(&xp_cd, unit);
    218 
    219 	switch (cmd) {
    220 	case XPIOCDOWNLD:
    221 		downld = addr;
    222 		loadsize = downld->size;
    223 		if (loadsize == 0 || loadsize > sc->sc_shm_size) {
    224 			return EINVAL;
    225 		}
    226 
    227 		loadbuf = kmem_alloc(loadsize, KM_SLEEP);
    228 		if (loadbuf == NULL) {
    229 			return ENOMEM;
    230 		}
    231 		error = copyin(downld->data, loadbuf, loadsize);
    232 		if (error == 0) {
    233 			put_pio0c(XP_RESET, ON);
    234 			delay(100);
    235 			memcpy((void *)sc->sc_shm_base, loadbuf, loadsize);
    236 			delay(100);
    237 			put_pio0c(XP_RESET, OFF);
    238 		} else {
    239 			DPRINTF(XP_DEBUG_ALL, ("%s: ioctl failed (err =  %d)\n",
    240 			    __func__, error));
    241 		}
    242 
    243 		kmem_free(loadbuf, loadsize);
    244 		return error;
    245 
    246 	default:
    247 		return ENOTTY;
    248 	}
    249 
    250 	panic("%s: cmd (%ld) is not handled", device_xname(sc->sc_dev), cmd);
    251 }
    252 
    253 paddr_t
    254 xp_mmap(dev_t dev, off_t offset, int prot)
    255 {
    256 	struct xp_softc *sc;
    257 	int unit;
    258 	paddr_t pa;
    259 
    260 	pa = -1;
    261 
    262 	unit = minor(dev);
    263 	sc = device_lookup_private(&xp_cd, unit);
    264 
    265 	if (offset >= 0 &&
    266 	    offset < sc->sc_shm_size) {
    267 		pa = m68k_btop(m68k_trunc_page(sc->sc_shm_base) + offset);
    268 	}
    269 
    270 	return pa;
    271 }
    272 
    273 int
    274 xp_read(dev_t dev, struct uio *uio, int flags)
    275 {
    276 
    277 	return ENODEV;
    278 }
    279 
    280 int
    281 xp_write(dev_t dev, struct uio *uio, int flags)
    282 {
    283 
    284 	return ENODEV;
    285 }
    286