Merge branch 'reset-seq' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libat...
[linux-2.6] / arch / arm / mach-ebsa110 / core.c
1 /*
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
38 static void ebsa110_mask_irq(unsigned int irq)
39 {
40         __raw_writeb(1 << irq, IRQ_MCLR);
41 }
42
43 static void ebsa110_unmask_irq(unsigned int irq)
44 {
45         __raw_writeb(1 << irq, IRQ_MSET);
46 }
47
48 static struct irq_chip ebsa110_irq_chip = {
49         .ack    = ebsa110_mask_irq,
50         .mask   = ebsa110_mask_irq,
51         .unmask = ebsa110_unmask_irq,
52 };
53  
54 static 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, handle_level_irq);
71                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
72         }
73 }
74
75 static struct map_desc ebsa110_io_desc[] __initdata = {
76         /*
77          * sparse external-decode ISAIO space
78          */
79         {       /* 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         },
100
101         /*
102          * self-decode ISAIO space
103          */
104         {
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         }
115 };
116
117 static 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  */
150 static 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
176 static irqreturn_t
177 ebsa110_timer_interrupt(int irq, void *dev_id)
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();
194
195         write_sequnlock(&xtime_lock);
196
197         return IRQ_HANDLED;
198 }
199
200 static struct irqaction ebsa110_timer_irq = {
201         .name           = "EBSA110 Timer Tick",
202         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
203         .handler        = ebsa110_timer_interrupt,
204 };
205
206 /*
207  * Set up timer interrupt.
208  */
209 static 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
221 static struct sys_timer ebsa110_timer = {
222         .init           = ebsa110_timer_init,
223         .offset         = ebsa110_gettimeoffset,
224 };
225
226 static 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
246 static struct platform_device serial_device = {
247         .name                   = "serial8250",
248         .id                     = PLAT8250_DEV_PLATFORM,
249         .dev                    = {
250                 .platform_data  = serial_platform_data,
251         },
252 };
253
254 static struct resource am79c961_resources[] = {
255         {
256                 .start          = 0x220,
257                 .end            = 0x238,
258                 .flags          = IORESOURCE_IO,
259         }, {
260                 .start          = IRQ_EBSA110_ETHERNET,
261                 .end            = IRQ_EBSA110_ETHERNET,
262                 .flags          = IORESOURCE_IRQ,
263         },
264 };
265
266 static struct platform_device am79c961_device = {
267         .name                   = "am79c961",
268         .id                     = -1,
269         .num_resources          = ARRAY_SIZE(am79c961_resources),
270         .resource               = am79c961_resources,
271 };
272
273 static struct platform_device *ebsa110_devices[] = {
274         &serial_device,
275         &am79c961_device,
276 };
277
278 static int __init ebsa110_init(void)
279 {
280         return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));
281 }
282
283 arch_initcall(ebsa110_init);
284
285 MACHINE_START(EBSA110, "EBSA110")
286         /* Maintainer: Russell King */
287         .phys_io        = 0xe0000000,
288         .io_pg_offst    = ((0xe0000000) >> 18) & 0xfffc,
289         .boot_params    = 0x00000400,
290         .reserve_lp0    = 1,
291         .reserve_lp2    = 1,
292         .soft_reboot    = 1,
293         .map_io         = ebsa110_map_io,
294         .init_irq       = ebsa110_init_irq,
295         .timer          = &ebsa110_timer,
296 MACHINE_END