sys/arch/arm/xscale/pxa2x0_com.c

   1 /*      $NetBSD: pxa2x0_com.c,v 1.11 2009/08/04 12:11:33 kiyohara Exp $ */
   2
   3 /*
   4  * Copyright 2003 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Steve C. Woodford for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __KERNEL_RCSID(0, "$NetBSD: pxa2x0_com.c,v 1.11 2009/08/04 12:11:33 kiyohara Exp $");
  40
  41 #include "opt_com.h"
  42
  43 #ifndef COM_PXA2X0
  44 #error "You must use options COM_PXA2X0 to get PXA2x0 serial port support"
  45 #endif
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/device.h>
  50 #include <sys/termios.h>
  51
  52 #include <machine/intr.h>
  53 #include <machine/bus.h>
  54
  55 #include <dev/ic/comreg.h>
  56 #include <dev/ic/comvar.h>
  57
  58 #include <arm/xscale/pxa2x0cpu.h>
  59 #include <arm/xscale/pxa2x0reg.h>
  60 #include <arm/xscale/pxa2x0var.h>
  61 #include <arm/xscale/pxa2x0_gpio.h>
  62
  63 #include "locators.h"
  64
  65 static int      pxauart_match(device_t, cfdata_t , void *);
  66 static void     pxauart_attach(device_t, device_t, void *);
  67
  68 CFATTACH_DECL_NEW(pxauart, sizeof(struct com_softc),
  69     pxauart_match, pxauart_attach, NULL, NULL);
  70
  71 static int
  72 pxauart_match(device_t parent, cfdata_t cf, void *aux)
  73 {
  74         struct pxaip_attach_args *pxa = aux;
  75         bus_space_tag_t bt = &pxa2x0_a4x_bs_tag;        /* XXX: This sucks */
  76         bus_space_handle_t bh;
  77         struct pxa2x0_gpioconf *gpioconf;
  78         u_int gpio;
  79         int rv, i;
  80
  81         switch (pxa->pxa_addr) {
  82         case PXA2X0_FFUART_BASE:
  83                 if (pxa->pxa_intr != PXA2X0_INT_FFUART)
  84                         return (0);
  85                 gpioconf = CPU_IS_PXA250 ? pxa25x_com_ffuart_gpioconf :
  86                             pxa27x_com_ffuart_gpioconf;
  87                 break;
  88
  89         case PXA2X0_STUART_BASE:
  90                 if (pxa->pxa_intr != PXA2X0_INT_STUART)
  91                         return (0);
  92                 gpioconf = CPU_IS_PXA250 ? pxa25x_com_stuart_gpioconf :
  93                             pxa27x_com_stuart_gpioconf;
  94                 break;
  95
  96         case PXA2X0_BTUART_BASE:        /* XXX: Config file option ... */
  97                 if (pxa->pxa_intr != PXA2X0_INT_BTUART)
  98                         return (0);
  99                 gpioconf = CPU_IS_PXA250 ? pxa25x_com_btuart_gpioconf :
 100                             pxa27x_com_btuart_gpioconf;
 101                 break;
 102
 103         case PXA2X0_HWUART_BASE:
 104                 if (pxa->pxa_intr != PXA2X0_INT_HWUART)
 105                         return (0);
 106                 if (CPU_IS_PXA270)
 107                         return (0);
 108                 gpioconf = pxa25x_com_hwuart_gpioconf;
 109                 break;
 110
 111         default:
 112                 return (0);
 113         }
 114         for (i = 0; gpioconf[i].pin != -1; i++) {
 115                 gpio = pxa2x0_gpio_get_function(gpioconf[i].pin);
 116                 if (GPIO_FN(gpio) != GPIO_FN(gpioconf[i].value) ||
 117                     GPIO_FN_IS_OUT(gpio) != GPIO_FN_IS_OUT(gpioconf[i].value))
 118                         return (0);
 119         }
 120
 121         pxa->pxa_size = 0x20;
 122
 123         if (com_is_console(bt, pxa->pxa_addr, NULL))
 124                 return (1);
 125
 126         if (bus_space_map(bt, pxa->pxa_addr, pxa->pxa_size, 0, &bh))
 127                 return (0);
 128
 129         /* Make sure the UART is enabled */
 130         bus_space_write_1(bt, bh, com_ier, IER_EUART);
 131
 132         rv = comprobe1(bt, bh);
 133         bus_space_unmap(bt, bh, pxa->pxa_size);
 134
 135         return (rv);
 136 }
 137
 138 static void
 139 pxauart_attach(device_t parent, device_t self, void *aux)
 140 {
 141         struct com_softc *sc = device_private(self);
 142         struct pxaip_attach_args *pxa = aux;
 143         bus_space_tag_t iot;
 144         bus_space_handle_t ioh;
 145         bus_addr_t iobase;
 146         int cken = 0;
 147
 148         sc->sc_dev = self;
 149         iot = &pxa2x0_a4x_bs_tag;       /* XXX: This sucks */
 150         iobase = pxa->pxa_addr;
 151         sc->sc_frequency = PXA2X0_COM_FREQ;
 152         sc->sc_type = COM_TYPE_PXA2x0;
 153
 154         if (com_is_console(iot, iobase, &ioh) == 0 &&
 155             bus_space_map(iot, iobase, pxa->pxa_size, 0, &ioh)) {
 156                 aprint_error(": can't map registers\n");
 157                 return;
 158         }
 159         COM_INIT_REGS(sc->sc_regs, iot, ioh, iobase);
 160
 161         switch (pxa->pxa_addr) {
 162         case PXA2X0_FFUART_BASE: cken = CKEN_FFUART; break;
 163         case PXA2X0_STUART_BASE: cken = CKEN_STUART; break;
 164         case PXA2X0_BTUART_BASE: cken = CKEN_BTUART; break;
 165         case PXA2X0_HWUART_BASE: cken = CKEN_HWUART; break;
 166         }
 167         pxa2x0_clkman_config(cken, 1);
 168
 169         com_attach_subr(sc);
 170
 171         pxa2x0_intr_establish(pxa->pxa_intr, IPL_SERIAL, comintr, sc);
 172 }