release/src-rt-6.x/cfe/cfe/dev/dev_ns16550_pci.c

   1 /*  *********************************************************************
   2     *  Broadcom Common Firmware Environment (CFE)
   3     *
   4     *  NS16550 UART driver (PCI)        File: dev_ns16550_pci.c
   5     *
   6     *  This is a console device driver for a PCI NS16550 UART
   7     *
   8     *  Author:  Mitch Lichtenberg (mpl@broadcom.com)
   9     *
  10     *********************************************************************
  11     *
  12     *  Copyright 2000,2001,2002,2003
  13     *  Broadcom Corporation. All rights reserved.
  14     *
  15     *  This software is furnished under license and may be used and
  16     *  copied only in accordance with the following terms and
  17     *  conditions.  Subject to these conditions, you may download,
  18     *  copy, install, use, modify and distribute modified or unmodified
  19     *  copies of this software in source and/or binary form.  No title
  20     *  or ownership is transferred hereby.
  21     *
  22     *  1) Any source code used, modified or distributed must reproduce
  23     *     and retain this copyright notice and list of conditions
  24     *     as they appear in the source file.
  25     *
  26     *  2) No right is granted to use any trade name, trademark, or
  27     *     logo of Broadcom Corporation.  The "Broadcom Corporation"
  28     *     name may not be used to endorse or promote products derived
  29     *     from this software without the prior written permission of
  30     *     Broadcom Corporation.
  31     *
  32     *  3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
  33     *     IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
  34     *     WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  35     *     PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
  36     *     SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
  37     *     PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
  38     *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  39     *     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  40     *     GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  41     *     BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  42     *     OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  43     *     TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
  44     *     THE POSSIBILITY OF SUCH DAMAGE.
  45     ********************************************************************* */
  46
  47
  48 #include "lib_types.h"
  49 #include "lib_malloc.h"
  50 #include "lib_printf.h"
  51 #include "cfe_iocb.h"
  52 #include "cfe_device.h"
  53 #include "cfe_ioctl.h"
  54
  55 #include "pcivar.h"
  56 #include "pcireg.h"
  57
  58
  59 /* Probe routine for real UART driver */
  60 extern void ns16550_uart_probe(cfe_driver_t *drv,
  61                                unsigned long probe_a, unsigned long probe_b,
  62                                void *probe_ptr);
  63
  64 /* Probe routine for this UART driver. */
  65 static void ns16550pci_uart_probe(cfe_driver_t *drv,
  66                                unsigned long probe_a, unsigned long probe_b,
  67                                void *probe_ptr);
  68
  69 /* We just glom onto the dispatch table in the real driver */
  70 extern const cfe_devdisp_t ns16550_uart_dispatch;
  71
  72 const cfe_driver_t ns16550pci_uart = {
  73     "PCI NS16550 UART",
  74     "uart",
  75     CFE_DEV_SERIAL,
  76     &ns16550_uart_dispatch,
  77     ns16550pci_uart_probe
  78 };
  79
  80
  81 static void
  82 ns16550pci_uart_probe(cfe_driver_t *drv,
  83                       unsigned long probe_a, unsigned long probe_b,
  84                       void *probe_ptr)
  85 {
  86     int index;
  87
  88     /*
  89      * NS16550-compatible UART on the PCI bus
  90      * probe_a, probe_b and probe_ptr are unused.
  91      *
  92      * This is for generic 16550-like UARTs. We use the PCI class and
  93      * interface codes to identify compatible hardware.  We require
  94      * 16550 or better compatibility. The 16{6,7,8,9}50 parts are
  95      * claimed to be 16550 compatible but are as yet untested.
  96      */
  97
  98     for (index = 0; ; index++) {
  99         pcitag_t tag;
 100         pcireg_t cr;
 101         phys_addr_t pa;
 102
 103         if (pci_find_class(PCI_CLASS_COMMUNICATIONS, index, &tag) != 0) {
 104             break;
 105             }
 106
 107         cr = pci_conf_read(tag, PCI_CLASS_REG);
 108         if (PCI_SUBCLASS(cr) == PCI_SUBCLASS_COMMUNICATIONS_SERIAL
 109             && PCI_INTERFACE(cr) >= 0x02          /* 16550 .. */
 110             && PCI_INTERFACE(cr) <= 0x06) {       /* 16950 */
 111             if (pci_map_io(tag, PCI_MAPREG(0), PCI_MATCH_BYTES, &pa) == 0)
 112                 ns16550_uart_probe(drv, pa, 0, NULL);
 113             }
 114         }
 115 }