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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Low-level parallel port routines for Archimedes onboard hardware
2 *
3 * Author: Phil Blundell <philb@gnu.org>
4 */
5
6/* This driver is for the parallel port hardware found on Acorn's old
7 * range of Archimedes machines. The A5000 and newer systems have PC-style
8 * I/O hardware and should use the parport_pc driver instead.
9 *
10 * The Acorn printer port hardware is very simple. There is a single 8-bit
11 * write-only latch for the data port and control/status bits are handled
12 * with various auxilliary input and output lines. The port is not
13 * bidirectional, does not support any modes other than SPP, and has only
14 * a subset of the standard printer control lines connected.
15 */
16
17#include <linux/threads.h>
18#include <linux/delay.h>
19#include <linux/errno.h>
20#include <linux/interrupt.h>
21#include <linux/ioport.h>
22#include <linux/kernel.h>
23#include <linux/slab.h>
24#include <linux/parport.h>
25
26#include <asm/ptrace.h>
27#include <asm/io.h>
28#include <asm/arch/oldlatches.h>
29#include <asm/arch/irqs.h>
30
31#define DATA_ADDRESS 0x3350010
32
33/* This is equivalent to the above and only used for request_region. */
34#define PORT_BASE 0x80000000 | ((DATA_ADDRESS - IO_BASE) >> 2)
35
36/* The hardware can't read from the data latch, so we must use a soft
37 copy. */
38static unsigned char data_copy;
39
40/* These are pretty simple. We know the irq is never shared and the
41 kernel does all the magic that's required. */
42static void arc_enable_irq(struct parport *p)
43{
44 enable_irq(p->irq);
45}
46
47static void arc_disable_irq(struct parport *p)
48{
49 disable_irq(p->irq);
50}
51
52static void arc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
53{
54 parport_generic_irq(irq, (struct parport *) dev_id, regs);
55}
56
57static void arc_write_data(struct parport *p, unsigned char data)
58{
59 data_copy = data;
60 outb_t(data, DATA_LATCH);
61}
62
63static unsigned char arc_read_data(struct parport *p)
64{
65 return data_copy;
66}
67
68static struct parport_operations parport_arc_ops =
69{
70 .write_data = arc_write_data,
71 .read_data = arc_read_data,
72
73 .write_control = arc_write_control,
74 .read_control = arc_read_control,
75 .frob_control = arc_frob_control,
76
77 .read_status = arc_read_status,
78
79 .enable_irq = arc_enable_irq,
80 .disable_irq = arc_disable_irq,
81
82 .data_forward = arc_data_forward,
83 .data_reverse = arc_data_reverse,
84
85 .init_state = arc_init_state,
86 .save_state = arc_save_state,
87 .restore_state = arc_restore_state,
88
89 .epp_write_data = parport_ieee1284_epp_write_data,
90 .epp_read_data = parport_ieee1284_epp_read_data,
91 .epp_write_addr = parport_ieee1284_epp_write_addr,
92 .epp_read_addr = parport_ieee1284_epp_read_addr,
93
94 .ecp_write_data = parport_ieee1284_ecp_write_data,
95 .ecp_read_data = parport_ieee1284_ecp_read_data,
96 .ecp_write_addr = parport_ieee1284_ecp_write_addr,
97
98 .compat_write_data = parport_ieee1284_write_compat,
99 .nibble_read_data = parport_ieee1284_read_nibble,
100 .byte_read_data = parport_ieee1284_read_byte,
101
102 .owner = THIS_MODULE,
103};
104
105/* --- Initialisation code -------------------------------- */
106
107static int parport_arc_init(void)
108{
109 /* Archimedes hardware provides only one port, at a fixed address */
110 struct parport *p;
111 struct resource res;
112 char *fake_name = "parport probe");
113
114 res = request_region(PORT_BASE, 1, fake_name);
115 if (res == NULL)
116 return 0;
117
118 p = parport_register_port (PORT_BASE, IRQ_PRINTERACK,
119 PARPORT_DMA_NONE, &parport_arc_ops);
120
121 if (!p) {
122 release_region(PORT_BASE, 1);
123 return 0;
124 }
125
126 p->modes = PARPORT_MODE_ARCSPP;
127 p->size = 1;
128 rename_region(res, p->name);
129
130 printk(KERN_INFO "%s: Archimedes on-board port, using irq %d\n",
131 p->irq);
132
133 /* Tell the high-level drivers about the port. */
134 parport_announce_port (p);
135
136 return 1;
137}
138
139module_init(parport_arc_init)