aspeed: introduce a configurable number of CPU per machine
[qemu/ar7.git] / hw / arm / pxa2xx_gpio.c
blobd1fc9cba67eb10e9a5d824d2c8a9ee1254a4fbd9
1 /*
2 * Intel XScale PXA255/270 GPIO controller emulation.
4 * Copyright (c) 2006 Openedhand Ltd.
5 * Written by Andrzej Zaborowski <balrog@zabor.org>
7 * This code is licensed under the GPL.
8 */
10 #include "qemu/osdep.h"
11 #include "cpu.h"
12 #include "hw/hw.h"
13 #include "hw/sysbus.h"
14 #include "hw/arm/pxa.h"
15 #include "qemu/log.h"
16 #include "qemu/module.h"
18 #define PXA2XX_GPIO_BANKS 4
20 #define TYPE_PXA2XX_GPIO "pxa2xx-gpio"
21 #define PXA2XX_GPIO(obj) \
22 OBJECT_CHECK(PXA2xxGPIOInfo, (obj), TYPE_PXA2XX_GPIO)
24 typedef struct PXA2xxGPIOInfo PXA2xxGPIOInfo;
25 struct PXA2xxGPIOInfo {
26 /*< private >*/
27 SysBusDevice parent_obj;
28 /*< public >*/
30 MemoryRegion iomem;
31 qemu_irq irq0, irq1, irqX;
32 int lines;
33 int ncpu;
34 ARMCPU *cpu;
36 /* XXX: GNU C vectors are more suitable */
37 uint32_t ilevel[PXA2XX_GPIO_BANKS];
38 uint32_t olevel[PXA2XX_GPIO_BANKS];
39 uint32_t dir[PXA2XX_GPIO_BANKS];
40 uint32_t rising[PXA2XX_GPIO_BANKS];
41 uint32_t falling[PXA2XX_GPIO_BANKS];
42 uint32_t status[PXA2XX_GPIO_BANKS];
43 uint32_t gafr[PXA2XX_GPIO_BANKS * 2];
45 uint32_t prev_level[PXA2XX_GPIO_BANKS];
46 qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
47 qemu_irq read_notify;
50 static struct {
51 enum {
52 GPIO_NONE,
53 GPLR,
54 GPSR,
55 GPCR,
56 GPDR,
57 GRER,
58 GFER,
59 GEDR,
60 GAFR_L,
61 GAFR_U,
62 } reg;
63 int bank;
64 } pxa2xx_gpio_regs[0x200] = {
65 [0 ... 0x1ff] = { GPIO_NONE, 0 },
66 #define PXA2XX_REG(reg, a0, a1, a2, a3) \
67 [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },
69 PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
70 PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
71 PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
72 PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
73 PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
74 PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
75 PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
76 PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
77 PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
80 static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s)
82 if (s->status[0] & (1 << 0))
83 qemu_irq_raise(s->irq0);
84 else
85 qemu_irq_lower(s->irq0);
87 if (s->status[0] & (1 << 1))
88 qemu_irq_raise(s->irq1);
89 else
90 qemu_irq_lower(s->irq1);
92 if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
93 qemu_irq_raise(s->irqX);
94 else
95 qemu_irq_lower(s->irqX);
98 /* Bitmap of pins used as standby and sleep wake-up sources. */
99 static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
100 0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
103 static void pxa2xx_gpio_set(void *opaque, int line, int level)
105 PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
106 CPUState *cpu = CPU(s->cpu);
107 int bank;
108 uint32_t mask;
110 if (line >= s->lines) {
111 printf("%s: No GPIO pin %i\n", __func__, line);
112 return;
115 bank = line >> 5;
116 mask = 1U << (line & 31);
118 if (level) {
119 s->status[bank] |= s->rising[bank] & mask &
120 ~s->ilevel[bank] & ~s->dir[bank];
121 s->ilevel[bank] |= mask;
122 } else {
123 s->status[bank] |= s->falling[bank] & mask &
124 s->ilevel[bank] & ~s->dir[bank];
125 s->ilevel[bank] &= ~mask;
128 if (s->status[bank] & mask)
129 pxa2xx_gpio_irq_update(s);
131 /* Wake-up GPIOs */
132 if (cpu->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank])) {
133 cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB);
137 static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
138 uint32_t level, diff;
139 int i, bit, line;
140 for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
141 level = s->olevel[i] & s->dir[i];
143 for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
144 bit = ctz32(diff);
145 line = bit + 32 * i;
146 qemu_set_irq(s->handler[line], (level >> bit) & 1);
149 s->prev_level[i] = level;
153 static uint64_t pxa2xx_gpio_read(void *opaque, hwaddr offset,
154 unsigned size)
156 PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
157 uint32_t ret;
158 int bank;
159 if (offset >= 0x200)
160 return 0;
162 bank = pxa2xx_gpio_regs[offset].bank;
163 switch (pxa2xx_gpio_regs[offset].reg) {
164 case GPDR: /* GPIO Pin-Direction registers */
165 return s->dir[bank];
167 case GPSR: /* GPIO Pin-Output Set registers */
168 qemu_log_mask(LOG_GUEST_ERROR,
169 "pxa2xx GPIO: read from write only register GPSR\n");
170 return 0;
172 case GPCR: /* GPIO Pin-Output Clear registers */
173 qemu_log_mask(LOG_GUEST_ERROR,
174 "pxa2xx GPIO: read from write only register GPCR\n");
175 return 0;
177 case GRER: /* GPIO Rising-Edge Detect Enable registers */
178 return s->rising[bank];
180 case GFER: /* GPIO Falling-Edge Detect Enable registers */
181 return s->falling[bank];
183 case GAFR_L: /* GPIO Alternate Function registers */
184 return s->gafr[bank * 2];
186 case GAFR_U: /* GPIO Alternate Function registers */
187 return s->gafr[bank * 2 + 1];
189 case GPLR: /* GPIO Pin-Level registers */
190 ret = (s->olevel[bank] & s->dir[bank]) |
191 (s->ilevel[bank] & ~s->dir[bank]);
192 qemu_irq_raise(s->read_notify);
193 return ret;
195 case GEDR: /* GPIO Edge Detect Status registers */
196 return s->status[bank];
198 default:
199 hw_error("%s: Bad offset " REG_FMT "\n", __func__, offset);
202 return 0;
205 static void pxa2xx_gpio_write(void *opaque, hwaddr offset,
206 uint64_t value, unsigned size)
208 PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
209 int bank;
210 if (offset >= 0x200)
211 return;
213 bank = pxa2xx_gpio_regs[offset].bank;
214 switch (pxa2xx_gpio_regs[offset].reg) {
215 case GPDR: /* GPIO Pin-Direction registers */
216 s->dir[bank] = value;
217 pxa2xx_gpio_handler_update(s);
218 break;
220 case GPSR: /* GPIO Pin-Output Set registers */
221 s->olevel[bank] |= value;
222 pxa2xx_gpio_handler_update(s);
223 break;
225 case GPCR: /* GPIO Pin-Output Clear registers */
226 s->olevel[bank] &= ~value;
227 pxa2xx_gpio_handler_update(s);
228 break;
230 case GRER: /* GPIO Rising-Edge Detect Enable registers */
231 s->rising[bank] = value;
232 break;
234 case GFER: /* GPIO Falling-Edge Detect Enable registers */
235 s->falling[bank] = value;
236 break;
238 case GAFR_L: /* GPIO Alternate Function registers */
239 s->gafr[bank * 2] = value;
240 break;
242 case GAFR_U: /* GPIO Alternate Function registers */
243 s->gafr[bank * 2 + 1] = value;
244 break;
246 case GEDR: /* GPIO Edge Detect Status registers */
247 s->status[bank] &= ~value;
248 pxa2xx_gpio_irq_update(s);
249 break;
251 default:
252 hw_error("%s: Bad offset " REG_FMT "\n", __func__, offset);
256 static const MemoryRegionOps pxa_gpio_ops = {
257 .read = pxa2xx_gpio_read,
258 .write = pxa2xx_gpio_write,
259 .endianness = DEVICE_NATIVE_ENDIAN,
262 DeviceState *pxa2xx_gpio_init(hwaddr base,
263 ARMCPU *cpu, DeviceState *pic, int lines)
265 CPUState *cs = CPU(cpu);
266 DeviceState *dev;
268 dev = qdev_create(NULL, TYPE_PXA2XX_GPIO);
269 qdev_prop_set_int32(dev, "lines", lines);
270 qdev_prop_set_int32(dev, "ncpu", cs->cpu_index);
271 qdev_init_nofail(dev);
273 sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
274 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0,
275 qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_0));
276 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1,
277 qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_1));
278 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2,
279 qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_X));
281 return dev;
284 static void pxa2xx_gpio_initfn(Object *obj)
286 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
287 DeviceState *dev = DEVICE(sbd);
288 PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);
290 memory_region_init_io(&s->iomem, obj, &pxa_gpio_ops,
291 s, "pxa2xx-gpio", 0x1000);
292 sysbus_init_mmio(sbd, &s->iomem);
293 sysbus_init_irq(sbd, &s->irq0);
294 sysbus_init_irq(sbd, &s->irq1);
295 sysbus_init_irq(sbd, &s->irqX);
298 static void pxa2xx_gpio_realize(DeviceState *dev, Error **errp)
300 PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);
302 s->cpu = ARM_CPU(qemu_get_cpu(s->ncpu));
304 qdev_init_gpio_in(dev, pxa2xx_gpio_set, s->lines);
305 qdev_init_gpio_out(dev, s->handler, s->lines);
309 * Registers a callback to notify on GPLR reads. This normally
310 * shouldn't be needed but it is used for the hack on Spitz machines.
312 void pxa2xx_gpio_read_notifier(DeviceState *dev, qemu_irq handler)
314 PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);
316 s->read_notify = handler;
319 static const VMStateDescription vmstate_pxa2xx_gpio_regs = {
320 .name = "pxa2xx-gpio",
321 .version_id = 1,
322 .minimum_version_id = 1,
323 .fields = (VMStateField[]) {
324 VMSTATE_UINT32_ARRAY(ilevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
325 VMSTATE_UINT32_ARRAY(olevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
326 VMSTATE_UINT32_ARRAY(dir, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
327 VMSTATE_UINT32_ARRAY(rising, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
328 VMSTATE_UINT32_ARRAY(falling, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
329 VMSTATE_UINT32_ARRAY(status, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
330 VMSTATE_UINT32_ARRAY(gafr, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS * 2),
331 VMSTATE_UINT32_ARRAY(prev_level, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
332 VMSTATE_END_OF_LIST(),
336 static Property pxa2xx_gpio_properties[] = {
337 DEFINE_PROP_INT32("lines", PXA2xxGPIOInfo, lines, 0),
338 DEFINE_PROP_INT32("ncpu", PXA2xxGPIOInfo, ncpu, 0),
339 DEFINE_PROP_END_OF_LIST(),
342 static void pxa2xx_gpio_class_init(ObjectClass *klass, void *data)
344 DeviceClass *dc = DEVICE_CLASS(klass);
346 dc->desc = "PXA2xx GPIO controller";
347 dc->props = pxa2xx_gpio_properties;
348 dc->vmsd = &vmstate_pxa2xx_gpio_regs;
349 dc->realize = pxa2xx_gpio_realize;
352 static const TypeInfo pxa2xx_gpio_info = {
353 .name = TYPE_PXA2XX_GPIO,
354 .parent = TYPE_SYS_BUS_DEVICE,
355 .instance_size = sizeof(PXA2xxGPIOInfo),
356 .instance_init = pxa2xx_gpio_initfn,
357 .class_init = pxa2xx_gpio_class_init,
360 static void pxa2xx_gpio_register_types(void)
362 type_register_static(&pxa2xx_gpio_info);
365 type_init(pxa2xx_gpio_register_types)