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 
serial_init_chip(struct parisc_device * dev)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 #if defined(CONFIG_64BIT) && defined(CONFIG_IOSAPIC)
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 
probe_serial_gsc(void)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");
131