LXR linux/drivers/tty/serial/8250/8250

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 *      Serial Device Initialisation for Lasi/Asp/Wax/Dino
   4 *
   5 *      (c) Copyright Matthew Wilcox <willy@debian.org> 2001-2002
   6 */
   7
   8#include <linux/errno.h>
   9#include <linux/init.h>
  10#include <linux/interrupt.h>
  11#include <linux/ioport.h>
  12#include <linux/module.h>
  13#include <linux/serial_core.h>
  14#include <linux/signal.h>
  15#include <linux/types.h>
  16
  17#include <asm/hardware.h>
  18#include <asm/parisc-device.h>
  19#include <asm/io.h>
  20
  21#include "8250.h"
  22
  23static int __init serial_init_chip(struct parisc_device *dev)
  24{
  25        struct uart_8250_port uart;
  26        unsigned long address;
  27        int err;
  28
  29#ifdef CONFIG_64BIT
  30        if (!dev->irq && (dev->id.sversion == 0xad))
  31                dev->irq = iosapic_serial_irq(dev);
  32#endif
  33
  34        if (!dev->irq) {
  35                /* We find some unattached serial ports by walking native
  36                 * busses.  These should be silently ignored.  Otherwise,
  37                 * what we have here is a missing parent device, so tell
  38                 * the user what they're missing.
  39                 */
  40                if (parisc_parent(dev)->id.hw_type != HPHW_IOA)
  41                        dev_info(&dev->dev,
  42                                "Serial: device 0x%llx not configured.\n"
  43                                "Enable support for Wax, Lasi, Asp or Dino.\n",
  44                                (unsigned long long)dev->hpa.start);
  45                return -ENODEV;
  46        }
  47
  48        address = dev->hpa.start;
  49        if (dev->id.sversion != 0x8d)
  50                address += 0x800;
  51
  52        memset(&uart, 0, sizeof(uart));
  53        uart.port.iotype        = UPIO_MEM;
  54        /* 7.272727MHz on Lasi.  Assumed the same for Dino, Wax and Timi. */
  55        uart.port.uartclk       = (dev->id.sversion != 0xad) ?
  56                                        7272727 : 1843200;
  57        uart.port.mapbase       = address;
  58        uart.port.membase       = ioremap(address, 16);
  59        if (!uart.port.membase) {
  60                dev_warn(&dev->dev, "Failed to map memory\n");
  61                return -ENOMEM;
  62        }
  63        uart.port.irq   = dev->irq;
  64        uart.port.flags = UPF_BOOT_AUTOCONF;
  65        uart.port.dev   = &dev->dev;
  66
  67        err = serial8250_register_8250_port(&uart);
  68        if (err < 0) {
  69                dev_warn(&dev->dev,
  70                        "serial8250_register_8250_port returned error %d\n",
  71                        err);
  72                iounmap(uart.port.membase);
  73                return err;
  74        }
  75
  76        return 0;
  77}
  78
  79static const struct parisc_device_id serial_tbl[] __initconst = {
  80        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00075 },
  81        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008c },
  82        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008d },
  83        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x000ad },
  84        { 0 }
  85};
  86
  87/* Hack.  Some machines have SERIAL_0 attached to Lasi and SERIAL_1
  88 * attached to Dino.  Unfortunately, Dino appears before Lasi in the device
  89 * tree.  To ensure that ttyS0 == SERIAL_0, we register two drivers; one
  90 * which only knows about Lasi and then a second which will find all the
  91 * other serial ports.  HPUX ignores this problem.
  92 */
  93static const struct parisc_device_id lasi_tbl[] __initconst = {
  94        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03B, 0x0008C }, /* C1xx/C1xxL */
  95        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03C, 0x0008C }, /* B132L */
  96        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03D, 0x0008C }, /* B160L */
  97        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03E, 0x0008C }, /* B132L+ */
  98        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03F, 0x0008C }, /* B180L+ */
  99        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x046, 0x0008C }, /* Rocky2 120 */
 100        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x047, 0x0008C }, /* Rocky2 150 */
 101        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x04E, 0x0008C }, /* Kiji L2 132 */
 102        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x056, 0x0008C }, /* Raven+ */
 103        { 0 }
 104};
 105
 106
 107MODULE_DEVICE_TABLE(parisc, serial_tbl);
 108
 109static struct parisc_driver lasi_driver __refdata = {
 110        .name           = "serial_1",
 111        .id_table       = lasi_tbl,
 112        .probe          = serial_init_chip,
 113};
 114
 115static struct parisc_driver serial_driver __refdata = {
 116        .name           = "serial",
 117        .id_table       = serial_tbl,
 118        .probe          = serial_init_chip,
 119};
 120
 121static int __init probe_serial_gsc(void)
 122{
 123        register_parisc_driver(&lasi_driver);
 124        register_parisc_driver(&serial_driver);
 125        return 0;
 126}
 127
 128module_init(probe_serial_gsc);
 129
 130MODULE_LICENSE("GPL");
 131