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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/mach-ebsa110/core.c
3 *
4 * Copyright (C) 1998-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Extra MM routines for the EBSA-110 architecture
11 */
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/interrupt.h>
15#include <linux/serial_8250.h>
16#include <linux/init.h>
17
18#include <asm/hardware.h>
19#include <asm/irq.h>
20#include <asm/io.h>
21#include <asm/setup.h>
22#include <asm/mach-types.h>
23#include <asm/pgtable.h>
24#include <asm/page.h>
25#include <asm/system.h>
26
27#include <asm/mach/arch.h>
28#include <asm/mach/irq.h>
29#include <asm/mach/map.h>
30
31#include <asm/mach/time.h>
32
33#define IRQ_MASK 0xfe000000 /* read */
34#define IRQ_MSET 0xfe000000 /* write */
35#define IRQ_STAT 0xff000000 /* read */
36#define IRQ_MCLR 0xff000000 /* write */
37
38static void ebsa110_mask_irq(unsigned int irq)
39{
40 __raw_writeb(1 << irq, IRQ_MCLR);
41}
42
43static void ebsa110_unmask_irq(unsigned int irq)
44{
45 __raw_writeb(1 << irq, IRQ_MSET);
46}
47
48static struct irqchip ebsa110_irq_chip = {
49 .ack = ebsa110_mask_irq,
50 .mask = ebsa110_mask_irq,
51 .unmask = ebsa110_unmask_irq,
52};
53
54static void __init ebsa110_init_irq(void)
55{
56 unsigned long flags;
57 unsigned int irq;
58
59 local_irq_save(flags);
60 __raw_writeb(0xff, IRQ_MCLR);
61 __raw_writeb(0x55, IRQ_MSET);
62 __raw_writeb(0x00, IRQ_MSET);
63 if (__raw_readb(IRQ_MASK) != 0x55)
64 while (1);
65 __raw_writeb(0xff, IRQ_MCLR); /* clear all interrupt enables */
66 local_irq_restore(flags);
67
68 for (irq = 0; irq < NR_IRQS; irq++) {
69 set_irq_chip(irq, &ebsa110_irq_chip);
70 set_irq_handler(irq, do_level_IRQ);
71 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
72 }
73}
74
75static struct map_desc ebsa110_io_desc[] __initdata = {
76 /*
77 * sparse external-decode ISAIO space
78 */
Deepak Saxena6cb19072005-10-28 15:19:08 +010079 { /* IRQ_STAT/IRQ_MCLR */
80 .virtual = IRQ_STAT,
81 .pfn = __phys_to_pfn(TRICK4_PHYS),
82 .length = PGDIR_SIZE,
83 .type = MT_DEVICE
84 }, { /* IRQ_MASK/IRQ_MSET */
85 .virtual = IRQ_MASK,
86 .pfn = __phys_to_pfn(TRICK3_PHYS),
87 .length = PGDIR_SIZE,
88 .type = MT_DEVICE
89 }, { /* SOFT_BASE */
90 .virtual = SOFT_BASE,
91 .pfn = __phys_to_pfn(TRICK1_PHYS),
92 .length = PGDIR_SIZE,
93 .type = MT_DEVICE
94 }, { /* PIT_BASE */
95 .virtual = PIT_BASE,
96 .pfn = __phys_to_pfn(TRICK0_PHYS),
97 .length = PGDIR_SIZE,
98 .type = MT_DEVICE
99 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 /*
102 * self-decode ISAIO space
103 */
Deepak Saxena6cb19072005-10-28 15:19:08 +0100104 {
105 .virtual = ISAIO_BASE,
106 .pfn = __phys_to_pfn(ISAIO_PHYS),
107 .length = ISAIO_SIZE,
108 .type = MT_DEVICE
109 }, {
110 .virtual = ISAMEM_BASE,
111 .pfn = __phys_to_pfn(ISAMEM_PHYS),
112 .length = ISAMEM_SIZE,
113 .type = MT_DEVICE
114 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115};
116
117static void __init ebsa110_map_io(void)
118{
119 iotable_init(ebsa110_io_desc, ARRAY_SIZE(ebsa110_io_desc));
120}
121
122
123#define PIT_CTRL (PIT_BASE + 0x0d)
124#define PIT_T2 (PIT_BASE + 0x09)
125#define PIT_T1 (PIT_BASE + 0x05)
126#define PIT_T0 (PIT_BASE + 0x01)
127
128/*
129 * This is the rate at which your MCLK signal toggles (in Hz)
130 * This was measured on a 10 digit frequency counter sampling
131 * over 1 second.
132 */
133#define MCLK 47894000
134
135/*
136 * This is the rate at which the PIT timers get clocked
137 */
138#define CLKBY7 (MCLK / 7)
139
140/*
141 * This is the counter value. We tick at 200Hz on this platform.
142 */
143#define COUNT ((CLKBY7 + (HZ / 2)) / HZ)
144
145/*
146 * Get the time offset from the system PIT. Note that if we have missed an
147 * interrupt, then the PIT counter will roll over (ie, be negative).
148 * This actually works out to be convenient.
149 */
150static unsigned long ebsa110_gettimeoffset(void)
151{
152 unsigned long offset, count;
153
154 __raw_writeb(0x40, PIT_CTRL);
155 count = __raw_readb(PIT_T1);
156 count |= __raw_readb(PIT_T1) << 8;
157
158 /*
159 * If count > COUNT, make the number negative.
160 */
161 if (count > COUNT)
162 count |= 0xffff0000;
163
164 offset = COUNT;
165 offset -= count;
166
167 /*
168 * `offset' is in units of timer counts. Convert
169 * offset to units of microseconds.
170 */
171 offset = offset * (1000000 / HZ) / COUNT;
172
173 return offset;
174}
175
176static irqreturn_t
177ebsa110_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
178{
179 u32 count;
180
181 write_seqlock(&xtime_lock);
182
183 /* latch and read timer 1 */
184 __raw_writeb(0x40, PIT_CTRL);
185 count = __raw_readb(PIT_T1);
186 count |= __raw_readb(PIT_T1) << 8;
187
188 count += COUNT;
189
190 __raw_writeb(count & 0xff, PIT_T1);
191 __raw_writeb(count >> 8, PIT_T1);
192
193 timer_tick(regs);
194
195 write_sequnlock(&xtime_lock);
196
197 return IRQ_HANDLED;
198}
199
200static struct irqaction ebsa110_timer_irq = {
201 .name = "EBSA110 Timer Tick",
Russell King09b8b5f2005-06-26 17:06:36 +0100202 .flags = SA_INTERRUPT | SA_TIMER,
203 .handler = ebsa110_timer_interrupt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204};
205
206/*
207 * Set up timer interrupt.
208 */
209static void __init ebsa110_timer_init(void)
210{
211 /*
212 * Timer 1, mode 2, LSB/MSB
213 */
214 __raw_writeb(0x70, PIT_CTRL);
215 __raw_writeb(COUNT & 0xff, PIT_T1);
216 __raw_writeb(COUNT >> 8, PIT_T1);
217
218 setup_irq(IRQ_EBSA110_TIMER0, &ebsa110_timer_irq);
219}
220
221static struct sys_timer ebsa110_timer = {
222 .init = ebsa110_timer_init,
223 .offset = ebsa110_gettimeoffset,
224};
225
226static struct plat_serial8250_port serial_platform_data[] = {
227 {
228 .iobase = 0x3f8,
229 .irq = 1,
230 .uartclk = 1843200,
231 .regshift = 0,
232 .iotype = UPIO_PORT,
233 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
234 },
235 {
236 .iobase = 0x2f8,
237 .irq = 2,
238 .uartclk = 1843200,
239 .regshift = 0,
240 .iotype = UPIO_PORT,
241 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
242 },
243 { },
244};
245
246static struct platform_device serial_device = {
247 .name = "serial8250",
Russell King6df29de2005-09-08 16:04:41 +0100248 .id = PLAT8250_DEV_PLATFORM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 .dev = {
250 .platform_data = serial_platform_data,
251 },
252};
253
254static int __init ebsa110_init(void)
255{
256 return platform_device_register(&serial_device);
257}
258
259arch_initcall(ebsa110_init);
260
261MACHINE_START(EBSA110, "EBSA110")
Russell Kinge9dea0c2005-07-03 17:38:58 +0100262 /* Maintainer: Russell King */
263 .phys_ram = 0x00000000,
264 .phys_io = 0xe0000000,
265 .io_pg_offst = ((0xe0000000) >> 18) & 0xfffc,
266 .boot_params = 0x00000400,
267 .reserve_lp0 = 1,
268 .reserve_lp2 = 1,
269 .soft_reboot = 1,
270 .map_io = ebsa110_map_io,
271 .init_irq = ebsa110_init_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 .timer = &ebsa110_timer,
273MACHINE_END