[qemu.git] / hw / slavio_timer.c

/*
 * QEMU Sparc SLAVIO timer controller emulation
 *
 * Copyright (c) 2003-2005 Fabrice Bellard
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "vl.h"

//#define DEBUG_TIMER

#ifdef DEBUG_TIMER
#define DPRINTF(fmt, args...) \
do { printf("TIMER: " fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...)
#endif

/*
 * Registers of hardware timer in sun4m.
 *
 * This is the timer/counter part of chip STP2001 (Slave I/O), also
 * produced as NCR89C105. See
 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
 * 
 * The 31-bit counter is incremented every 500ns by bit 9. Bits 8..0
 * are zero. Bit 31 is 1 when count has been reached.
 *
 */

typedef struct SLAVIO_TIMERState {
    uint32_t limit, count, counthigh;
    int64_t count_load_time;
    int64_t expire_time;
    int64_t stop_time, tick_offset;
    QEMUTimer *irq_timer;
    int irq;
    int reached, stopped;
    int mode; // 0 = processor, 1 = user, 2 = system
} SLAVIO_TIMERState;

#define TIMER_MAXADDR 0x1f
#define CNT_FREQ 2000000
#define MAX_CPUS 16

// Update count, set irq, update expire_time
static void slavio_timer_get_out(SLAVIO_TIMERState *s)
{
    int out;
    int64_t diff, ticks, count;
    uint32_t limit;

    // There are three clock tick units: CPU ticks, register units
    // (nanoseconds), and counter ticks (500 ns).
    if (s->mode == 1 && s->stopped)
	ticks = s->stop_time;
    else
	ticks = qemu_get_clock(vm_clock) - s->tick_offset;

    out = (ticks >= s->expire_time);
    if (out)
	s->reached = 0x80000000;
    if (!s->limit)
	limit = 0x7fffffff;
    else
	limit = s->limit;

    // Convert register units to counter ticks
    limit = limit >> 9;

    // Convert cpu ticks to counter ticks
    diff = muldiv64(ticks - s->count_load_time, CNT_FREQ, ticks_per_sec);

    // Calculate what the counter should be, convert to register
    // units
    count = diff % limit;
    s->count = count << 9;
    s->counthigh = count >> 22;

    // Expire time: CPU ticks left to next interrupt
    // Convert remaining counter ticks to CPU ticks
    s->expire_time = ticks + muldiv64(limit - count, ticks_per_sec, CNT_FREQ);

    DPRINTF("irq %d limit %d reached %d d %lld count %d s->c %x diff %lld stopped %d mode %d\n", s->irq, limit, s->reached?1:0, (ticks-s->count_load_time), count, s->count, s->expire_time - ticks, s->stopped, s->mode);

    if (s->mode != 1)
	pic_set_irq(s->irq, out);
}

// timer callback
static void slavio_timer_irq(void *opaque)
{
    SLAVIO_TIMERState *s = opaque;

    if (!s->irq_timer)
        return;
    slavio_timer_get_out(s);
    if (s->mode != 1)
	qemu_mod_timer(s->irq_timer, s->expire_time);
}

static uint32_t slavio_timer_mem_readl(void *opaque, target_phys_addr_t addr)
{
    SLAVIO_TIMERState *s = opaque;
    uint32_t saddr;

    saddr = (addr & TIMER_MAXADDR) >> 2;
    switch (saddr) {
    case 0:
	// read limit (system counter mode) or read most signifying
	// part of counter (user mode)
	if (s->mode != 1) {
	    // clear irq
	    pic_set_irq(s->irq, 0);
	    s->count_load_time = qemu_get_clock(vm_clock);
	    s->reached = 0;
	    return s->limit;
	}
	else {
	    slavio_timer_get_out(s);
	    return s->counthigh & 0x7fffffff;
	}
    case 1:
	// read counter and reached bit (system mode) or read lsbits
	// of counter (user mode)
	slavio_timer_get_out(s);
	if (s->mode != 1)
	    return (s->count & 0x7fffffff) | s->reached;
	else
	    return s->count;
    case 3:
	// read start/stop status
	return s->stopped;
    case 4:
	// read user/system mode
	return s->mode & 1;
    default:
	return 0;
    }
}

static void slavio_timer_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
    SLAVIO_TIMERState *s = opaque;
    uint32_t saddr;

    saddr = (addr & TIMER_MAXADDR) >> 2;
    switch (saddr) {
    case 0:
	// set limit, reset counter
	s->count_load_time = qemu_get_clock(vm_clock);
	// fall through
    case 2:
	// set limit without resetting counter
	if (!val)
	    s->limit = 0x7fffffff;
	else
	    s->limit = val & 0x7fffffff;
	slavio_timer_irq(s);
	break;
    case 3:
	// start/stop user counter
	if (s->mode == 1) {
	    if (val & 1) {
		s->stop_time = qemu_get_clock(vm_clock);
		s->stopped = 1;
	    }
	    else {
		if (s->stopped)
		    s->tick_offset += qemu_get_clock(vm_clock) - s->stop_time;
		s->stopped = 0;
	    }
	}
	break;
    case 4:
	// bit 0: user (1) or system (0) counter mode
	if (s->mode == 0 || s->mode == 1)
	    s->mode = val & 1;
	break;
    default:
	break;
    }
}

static CPUReadMemoryFunc *slavio_timer_mem_read[3] = {
    slavio_timer_mem_readl,
    slavio_timer_mem_readl,
    slavio_timer_mem_readl,
};

static CPUWriteMemoryFunc *slavio_timer_mem_write[3] = {
    slavio_timer_mem_writel,
    slavio_timer_mem_writel,
    slavio_timer_mem_writel,
};

static void slavio_timer_save(QEMUFile *f, void *opaque)
{
    SLAVIO_TIMERState *s = opaque;

    qemu_put_be32s(f, &s->limit);
    qemu_put_be32s(f, &s->count);
    qemu_put_be32s(f, &s->counthigh);
    qemu_put_be64s(f, &s->count_load_time);
    qemu_put_be64s(f, &s->expire_time);
    qemu_put_be64s(f, &s->stop_time);
    qemu_put_be64s(f, &s->tick_offset);
    qemu_put_be32s(f, &s->irq);
    qemu_put_be32s(f, &s->reached);
    qemu_put_be32s(f, &s->stopped);
    qemu_put_be32s(f, &s->mode);
}

static int slavio_timer_load(QEMUFile *f, void *opaque, int version_id)
{
    SLAVIO_TIMERState *s = opaque;
    
    if (version_id != 1)
        return -EINVAL;

    qemu_get_be32s(f, &s->limit);
    qemu_get_be32s(f, &s->count);
    qemu_get_be32s(f, &s->counthigh);
    qemu_get_be64s(f, &s->count_load_time);
    qemu_get_be64s(f, &s->expire_time);
    qemu_get_be64s(f, &s->stop_time);
    qemu_get_be64s(f, &s->tick_offset);
    qemu_get_be32s(f, &s->irq);
    qemu_get_be32s(f, &s->reached);
    qemu_get_be32s(f, &s->stopped);
    qemu_get_be32s(f, &s->mode);
    return 0;
}

static void slavio_timer_reset(void *opaque)
{
    SLAVIO_TIMERState *s = opaque;

    s->limit = 0;
    s->count = 0;
    s->count_load_time = qemu_get_clock(vm_clock);;
    s->stop_time = s->count_load_time;
    s->tick_offset = 0;
    s->reached = 0;
    s->mode &= 2;
    s->stopped = 1;
    slavio_timer_get_out(s);
}

static void slavio_timer_init_internal(uint32_t addr, int irq, int mode)
{
    int slavio_timer_io_memory;
    SLAVIO_TIMERState *s;

    s = qemu_mallocz(sizeof(SLAVIO_TIMERState));
    if (!s)
        return;
    s->irq = irq;
    s->mode = mode;
    s->irq_timer = qemu_new_timer(vm_clock, slavio_timer_irq, s);

    slavio_timer_io_memory = cpu_register_io_memory(0, slavio_timer_mem_read,
						    slavio_timer_mem_write, s);
    cpu_register_physical_memory(addr, TIMER_MAXADDR, slavio_timer_io_memory);
    register_savevm("slavio_timer", addr, 1, slavio_timer_save, slavio_timer_load, s);
    qemu_register_reset(slavio_timer_reset, s);
    slavio_timer_reset(s);
}

void slavio_timer_init(uint32_t addr1, int irq1, uint32_t addr2, int irq2)
{
    int i;

    for (i = 0; i < MAX_CPUS; i++) {
	slavio_timer_init_internal(addr1 + i * TARGET_PAGE_SIZE, irq1, 0);
    }

    slavio_timer_init_internal(addr2, irq2, 2);
}
Commit	Line	Data
e80cfcfc FB	1	/*
	2	* QEMU Sparc SLAVIO timer controller emulation
	3	*
66321a11	4	* Copyright (c) 2003-2005 Fabrice Bellard
e80cfcfc FB	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24	#include "vl.h"
	25
	26	//#define DEBUG_TIMER
	27
66321a11 FB	28	#ifdef DEBUG_TIMER
	29	#define DPRINTF(fmt, args...) \
	30	do { printf("TIMER: " fmt , ##args); } while (0)
	31	#else
	32	#define DPRINTF(fmt, args...)
	33	#endif
	34
e80cfcfc FB	35	/*
	36	* Registers of hardware timer in sun4m.
	37	*
	38	* This is the timer/counter part of chip STP2001 (Slave I/O), also
	39	* produced as NCR89C105. See
	40	* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
	41	*
	42	* The 31-bit counter is incremented every 500ns by bit 9. Bits 8..0
	43	* are zero. Bit 31 is 1 when count has been reached.
	44	*
	45	*/
	46
	47	typedef struct SLAVIO_TIMERState {
	48	uint32_t limit, count, counthigh;
	49	int64_t count_load_time;
	50	int64_t expire_time;
	51	int64_t stop_time, tick_offset;
	52	QEMUTimer *irq_timer;
	53	int irq;
	54	int reached, stopped;
	55	int mode; // 0 = processor, 1 = user, 2 = system
	56	} SLAVIO_TIMERState;
	57
	58	#define TIMER_MAXADDR 0x1f
	59	#define CNT_FREQ 2000000
	60	#define MAX_CPUS 16
	61
	62	// Update count, set irq, update expire_time
	63	static void slavio_timer_get_out(SLAVIO_TIMERState *s)
	64	{
	65	int out;
	66	int64_t diff, ticks, count;
	67	uint32_t limit;
	68
	69	// There are three clock tick units: CPU ticks, register units
	70	// (nanoseconds), and counter ticks (500 ns).
	71	if (s->mode == 1 && s->stopped)
	72	ticks = s->stop_time;
	73	else
	74	ticks = qemu_get_clock(vm_clock) - s->tick_offset;
	75
	76	out = (ticks >= s->expire_time);
	77	if (out)
	78	s->reached = 0x80000000;
	79	if (!s->limit)
	80	limit = 0x7fffffff;
	81	else
	82	limit = s->limit;
	83
	84	// Convert register units to counter ticks
	85	limit = limit >> 9;
	86
	87	// Convert cpu ticks to counter ticks
	88	diff = muldiv64(ticks - s->count_load_time, CNT_FREQ, ticks_per_sec);
	89
	90	// Calculate what the counter should be, convert to register
	91	// units
	92	count = diff % limit;
	93	s->count = count << 9;
	94	s->counthigh = count >> 22;
	95
	96	// Expire time: CPU ticks left to next interrupt
	97	// Convert remaining counter ticks to CPU ticks
	98	s->expire_time = ticks + muldiv64(limit - count, ticks_per_sec, CNT_FREQ);
99
66321a11 FB	100	DPRINTF("irq %d limit %d reached %d d %lld count %d s->c %x diff %lld stopped %d mode %d\n", s->irq, limit, s->reached?1:0, (ticks-s->count_load_time), count, s->count, s->expire_time - ticks, s->stopped, s->mode);
66321a11 FB	101
e80cfcfc FB	102	if (s->mode != 1)
	103	pic_set_irq(s->irq, out);
	104	}
	105
	106	// timer callback
	107	static void slavio_timer_irq(void *opaque)
	108	{
	109	SLAVIO_TIMERState *s = opaque;
	110
	111	if (!s->irq_timer)
	112	return;
	113	slavio_timer_get_out(s);
	114	if (s->mode != 1)
	115	qemu_mod_timer(s->irq_timer, s->expire_time);
	116	}
	117
	118	static uint32_t slavio_timer_mem_readl(void *opaque, target_phys_addr_t addr)
	119	{
	120	SLAVIO_TIMERState *s = opaque;
	121	uint32_t saddr;
	122
	123	saddr = (addr & TIMER_MAXADDR) >> 2;
	124	switch (saddr) {
	125	case 0:
	126	// read limit (system counter mode) or read most signifying
	127	// part of counter (user mode)
	128	if (s->mode != 1) {
	129	// clear irq
	130	pic_set_irq(s->irq, 0);
	131	s->count_load_time = qemu_get_clock(vm_clock);
	132	s->reached = 0;
	133	return s->limit;
	134	}
	135	else {
	136	slavio_timer_get_out(s);
	137	return s->counthigh & 0x7fffffff;
	138	}
	139	case 1:
	140	// read counter and reached bit (system mode) or read lsbits
	141	// of counter (user mode)
	142	slavio_timer_get_out(s);
	143	if (s->mode != 1)
	144	return (s->count & 0x7fffffff) \| s->reached;
	145	else
	146	return s->count;
	147	case 3:
	148	// read start/stop status
	149	return s->stopped;
	150	case 4:
	151	// read user/system mode
	152	return s->mode & 1;
	153	default:
	154	return 0;
	155	}
	156	}
	157
	158	static void slavio_timer_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
	159	{
	160	SLAVIO_TIMERState *s = opaque;
	161	uint32_t saddr;
	162
	163	saddr = (addr & TIMER_MAXADDR) >> 2;
	164	switch (saddr) {
	165	case 0:
166	// set limit, reset counter
167	s->count_load_time = qemu_get_clock(vm_clock);
168	// fall through
169	case 2:
170	// set limit without resetting counter
171	if (!val)
172	s->limit = 0x7fffffff;
173	else
174	s->limit = val & 0x7fffffff;
175	slavio_timer_irq(s);
176	break;
177	case 3:
178	// start/stop user counter
179	if (s->mode == 1) {
180	if (val & 1) {
181	s->stop_time = qemu_get_clock(vm_clock);
182	s->stopped = 1;
183	}
184	else {
185	if (s->stopped)
186	s->tick_offset += qemu_get_clock(vm_clock) - s->stop_time;
187	s->stopped = 0;
188	}
189	}
190	break;
191	case 4:
192	// bit 0: user (1) or system (0) counter mode
193	if (s->mode == 0 \|\| s->mode == 1)
194	s->mode = val & 1;
195	break;
196	default:
197	break;
198	}
199	}
200
201	static CPUReadMemoryFunc *slavio_timer_mem_read[3] = {
202	slavio_timer_mem_readl,
203	slavio_timer_mem_readl,
204	slavio_timer_mem_readl,
205	};
206
207	static CPUWriteMemoryFunc *slavio_timer_mem_write[3] = {
208	slavio_timer_mem_writel,
209	slavio_timer_mem_writel,
210	slavio_timer_mem_writel,
211	};
212
213	static void slavio_timer_save(QEMUFile f, void opaque)
214	{
215	SLAVIO_TIMERState *s = opaque;
216
217	qemu_put_be32s(f, &s->limit);
218	qemu_put_be32s(f, &s->count);
219	qemu_put_be32s(f, &s->counthigh);
220	qemu_put_be64s(f, &s->count_load_time);
221	qemu_put_be64s(f, &s->expire_time);
222	qemu_put_be64s(f, &s->stop_time);
223	qemu_put_be64s(f, &s->tick_offset);
224	qemu_put_be32s(f, &s->irq);
225	qemu_put_be32s(f, &s->reached);
226	qemu_put_be32s(f, &s->stopped);
227	qemu_put_be32s(f, &s->mode);
228	}
229
230	static int slavio_timer_load(QEMUFile f, void opaque, int version_id)
231	{
232	SLAVIO_TIMERState *s = opaque;
233
234	if (version_id != 1)
235	return -EINVAL;
236
237	qemu_get_be32s(f, &s->limit);
238	qemu_get_be32s(f, &s->count);
239	qemu_get_be32s(f, &s->counthigh);
240	qemu_get_be64s(f, &s->count_load_time);
241	qemu_get_be64s(f, &s->expire_time);
242	qemu_get_be64s(f, &s->stop_time);
243	qemu_get_be64s(f, &s->tick_offset);
244	qemu_get_be32s(f, &s->irq);
245	qemu_get_be32s(f, &s->reached);
246	qemu_get_be32s(f, &s->stopped);
247	qemu_get_be32s(f, &s->mode);
248	return 0;
249	}
250
251	static void slavio_timer_reset(void *opaque)
252	{
253	SLAVIO_TIMERState *s = opaque;
254
255	s->limit = 0;
256	s->count = 0;
257	s->count_load_time = qemu_get_clock(vm_clock);;
258	s->stop_time = s->count_load_time;
259	s->tick_offset = 0;
260	s->reached = 0;
261	s->mode &= 2;
262	s->stopped = 1;
263	slavio_timer_get_out(s);
264	}
265
266	static void slavio_timer_init_internal(uint32_t addr, int irq, int mode)
267	{
268	int slavio_timer_io_memory;
269	SLAVIO_TIMERState *s;
270
271	s = qemu_mallocz(sizeof(SLAVIO_TIMERState));
272	if (!s)
273	return;
274	s->irq = irq;
275	s->mode = mode;
276	s->irq_timer = qemu_new_timer(vm_clock, slavio_timer_irq, s);
277
278	slavio_timer_io_memory = cpu_register_io_memory(0, slavio_timer_mem_read,
279	slavio_timer_mem_write, s);
280	cpu_register_physical_memory(addr, TIMER_MAXADDR, slavio_timer_io_memory);
281	register_savevm("slavio_timer", addr, 1, slavio_timer_save, slavio_timer_load, s);
282	qemu_register_reset(slavio_timer_reset, s);
283	slavio_timer_reset(s);
284	}
285
286	void slavio_timer_init(uint32_t addr1, int irq1, uint32_t addr2, int irq2)
287	{
288	int i;
289
290	for (i = 0; i < MAX_CPUS; i++) {
291	slavio_timer_init_internal(addr1 + i * TARGET_PAGE_SIZE, irq1, 0);
292	}
293
294	slavio_timer_init_internal(addr2, irq2, 2);
295	}