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 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 "cfe.h" 49 50#include "pcivar.h" 51#include "pcireg.h" 52 53 54/* Assumed reference clock for PCI UARTs. */ 55#undef NS16550_HZ 56#define NS16550_HZ 1843200 57 58/* Probe routine for real UART driver. */ 59extern void ns16550_uart_probe(cfe_driver_t *drv, 60 unsigned long probe_a, unsigned long probe_b, 61 void *probe_ptr); 62 63/* Probe routine for this UART driver. */ 64static void ns16550pci_uart_probe(cfe_driver_t *drv, 65 unsigned long probe_a, unsigned long probe_b, 66 void *probe_ptr); 67 68/* We just glom onto the dispatch table in the real driver */ 69extern const cfe_devdisp_t ns16550_uart_dispatch; 70 71const cfe_driver_t ns16550pci_uart = { 72 "PCI NS16550 UART", 73 "uart", 74 CFE_DEV_SERIAL, 75 &ns16550_uart_dispatch, 76 ns16550pci_uart_probe 77}; 78 79 80static void 81ns16550pci_uart_probe(cfe_driver_t *drv, 82 unsigned long probe_a, unsigned long probe_b, 83 void *probe_ptr) 84{ 85 int index; 86 87 /* 88 * NS16550-compatible UART on the PCI bus 89 * probe_a, probe_b and probe_ptr are unused. 90 * 91 * This is for generic 16550-like UARTs. We use the PCI class and 92 * interface codes to identify compatible hardware. We require 93 * 16550 or better compatibility. The 16{6,7,8,9}50 parts are 94 * claimed to be 16550 compatible but are as yet untested. 95 */ 96 97 for (index = 0; ; index++) { 98 pcitag_t tag; 99 pcireg_t cr; 100 phys_addr_t pa; 101 102 if (pci_find_class(PCI_CLASS_COMMUNICATIONS, index, &tag) != 0) { 103 break; 104 } 105 106 cr = pci_conf_read(tag, PCI_CLASS_REG); 107 if (PCI_SUBCLASS(cr) == PCI_SUBCLASS_COMMUNICATIONS_SERIAL 108 && PCI_INTERFACE(cr) >= 0x02 /* 16550 .. */ 109 && PCI_INTERFACE(cr) <= 0x06) { /* 16950 */ 110 if (pci_map_io(tag, PCI_MAPREG(0), PCI_MATCH_BYTES, &pa) == 0) 111 ns16550_uart_probe(drv, pa, NS16550_HZ, NULL); 112 else 113 if (pci_map_mem(tag, PCI_MAPREG(0), PCI_MATCH_BYTES, &pa) == 0) 114 ns16550_uart_probe(drv, pa, NS16550_HZ, NULL); 115 } 116 } 117} 118