drivers/tty/serial/8250/8250_gsc.c

   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
  23 static 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
  79 static 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  */
  93 static 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
 107 MODULE_DEVICE_TABLE(parisc, serial_tbl);
 108
 109 static struct parisc_driver lasi_driver __refdata = {
 110         .name           = "serial_1",
 111         .id_table       = lasi_tbl,
 112         .probe          = serial_init_chip,
 113 };
 114
 115 static struct parisc_driver serial_driver __refdata = {
 116         .name           = "serial",
 117         .id_table       = serial_tbl,
 118         .probe          = serial_init_chip,
 119 };
 120
 121 static int __init probe_serial_gsc(void)
 122 {
 123         register_parisc_driver(&lasi_driver);
 124         register_parisc_driver(&serial_driver);
 125         return 0;
 126 }
 127
 128 module_init(probe_serial_gsc);
 129
 130 MODULE_LICENSE("GPL");