2 * ARM TrustZone peripheral protection controller emulation
4 * Copyright (c) 2018 Linaro Limited
5 * Written by Peter Maydell
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 or
9 * (at your option) any later version.
12 #include "qemu/osdep.h"
14 #include "qapi/error.h"
16 #include "hw/sysbus.h"
17 #include "hw/registerfields.h"
18 #include "hw/misc/tz-ppc.h"
20 static void tz_ppc_update_irq(TZPPC *s)
22 bool level = s->irq_status && s->irq_enable;
24 trace_tz_ppc_update_irq(level);
25 qemu_set_irq(s->irq, level);
28 static void tz_ppc_cfg_nonsec(void *opaque, int n, int level)
30 TZPPC *s = TZ_PPC(opaque);
32 assert(n < TZ_NUM_PORTS);
33 trace_tz_ppc_cfg_nonsec(n, level);
34 s->cfg_nonsec[n] = level;
37 static void tz_ppc_cfg_ap(void *opaque, int n, int level)
39 TZPPC *s = TZ_PPC(opaque);
41 assert(n < TZ_NUM_PORTS);
42 trace_tz_ppc_cfg_ap(n, level);
46 static void tz_ppc_cfg_sec_resp(void *opaque, int n, int level)
48 TZPPC *s = TZ_PPC(opaque);
50 trace_tz_ppc_cfg_sec_resp(level);
51 s->cfg_sec_resp = level;
54 static void tz_ppc_irq_enable(void *opaque, int n, int level)
56 TZPPC *s = TZ_PPC(opaque);
58 trace_tz_ppc_irq_enable(level);
59 s->irq_enable = level;
63 static void tz_ppc_irq_clear(void *opaque, int n, int level)
65 TZPPC *s = TZ_PPC(opaque);
67 trace_tz_ppc_irq_clear(level);
71 s->irq_status = false;
76 static bool tz_ppc_check(TZPPC *s, int n, MemTxAttrs attrs)
78 /* Check whether to allow an access to port n; return true if
79 * the check passes, and false if the transaction must be blocked.
80 * If the latter, the caller must check cfg_sec_resp to determine
81 * whether to abort or RAZ/WI the transaction.
83 * + nonsec_mask suppresses any check of the secure attribute
84 * + otherwise, block if cfg_nonsec is 1 and transaction is secure,
85 * or if cfg_nonsec is 0 and transaction is non-secure
86 * + block if transaction is usermode and cfg_ap is 0
88 if ((attrs.secure == s->cfg_nonsec[n] && !(s->nonsec_mask & (1 << n))) ||
89 (attrs.user && !s->cfg_ap[n])) {
90 /* Block the transaction. */
92 /* Note that holding irq_clear high suppresses interrupts */
101 static MemTxResult tz_ppc_read(void *opaque, hwaddr addr, uint64_t *pdata,
102 unsigned size, MemTxAttrs attrs)
104 TZPPCPort *p = opaque;
107 AddressSpace *as = &p->downstream_as;
111 if (!tz_ppc_check(s, n, attrs)) {
112 trace_tz_ppc_read_blocked(n, addr, attrs.secure, attrs.user);
113 if (s->cfg_sec_resp) {
123 data = address_space_ldub(as, addr, attrs, &res);
126 data = address_space_lduw_le(as, addr, attrs, &res);
129 data = address_space_ldl_le(as, addr, attrs, &res);
132 data = address_space_ldq_le(as, addr, attrs, &res);
135 g_assert_not_reached();
141 static MemTxResult tz_ppc_write(void *opaque, hwaddr addr, uint64_t val,
142 unsigned size, MemTxAttrs attrs)
144 TZPPCPort *p = opaque;
146 AddressSpace *as = &p->downstream_as;
150 if (!tz_ppc_check(s, n, attrs)) {
151 trace_tz_ppc_write_blocked(n, addr, attrs.secure, attrs.user);
152 if (s->cfg_sec_resp) {
161 address_space_stb(as, addr, val, attrs, &res);
164 address_space_stw_le(as, addr, val, attrs, &res);
167 address_space_stl_le(as, addr, val, attrs, &res);
170 address_space_stq_le(as, addr, val, attrs, &res);
173 g_assert_not_reached();
178 static const MemoryRegionOps tz_ppc_ops = {
179 .read_with_attrs = tz_ppc_read,
180 .write_with_attrs = tz_ppc_write,
181 .endianness = DEVICE_LITTLE_ENDIAN,
184 static bool tz_ppc_dummy_accepts(void *opaque, hwaddr addr,
185 unsigned size, bool is_write,
189 * Board code should never map the upstream end of an unused port,
190 * so we should never try to make a memory access to it.
192 g_assert_not_reached();
195 static const MemoryRegionOps tz_ppc_dummy_ops = {
196 .valid.accepts = tz_ppc_dummy_accepts,
199 static void tz_ppc_reset(DeviceState *dev)
201 TZPPC *s = TZ_PPC(dev);
203 trace_tz_ppc_reset();
204 s->cfg_sec_resp = false;
205 memset(s->cfg_nonsec, 0, sizeof(s->cfg_nonsec));
206 memset(s->cfg_ap, 0, sizeof(s->cfg_ap));
209 static void tz_ppc_init(Object *obj)
211 DeviceState *dev = DEVICE(obj);
212 TZPPC *s = TZ_PPC(obj);
214 qdev_init_gpio_in_named(dev, tz_ppc_cfg_nonsec, "cfg_nonsec", TZ_NUM_PORTS);
215 qdev_init_gpio_in_named(dev, tz_ppc_cfg_ap, "cfg_ap", TZ_NUM_PORTS);
216 qdev_init_gpio_in_named(dev, tz_ppc_cfg_sec_resp, "cfg_sec_resp", 1);
217 qdev_init_gpio_in_named(dev, tz_ppc_irq_enable, "irq_enable", 1);
218 qdev_init_gpio_in_named(dev, tz_ppc_irq_clear, "irq_clear", 1);
219 qdev_init_gpio_out_named(dev, &s->irq, "irq", 1);
222 static void tz_ppc_realize(DeviceState *dev, Error **errp)
224 Object *obj = OBJECT(dev);
225 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
226 TZPPC *s = TZ_PPC(dev);
230 /* We can't create the upstream end of the port until realize,
231 * as we don't know the size of the MR used as the downstream until then.
233 for (i = 0; i < TZ_NUM_PORTS; i++) {
234 if (s->port[i].downstream) {
239 for (i = 0; i <= max_port; i++) {
240 TZPPCPort *port = &s->port[i];
244 if (!port->downstream) {
246 * Create dummy sysbus MMIO region so the sysbus region
247 * numbering doesn't get out of sync with the port numbers.
248 * The size is entirely arbitrary.
250 name = g_strdup_printf("tz-ppc-dummy-port[%d]", i);
251 memory_region_init_io(&port->upstream, obj, &tz_ppc_dummy_ops,
252 port, name, 0x10000);
253 sysbus_init_mmio(sbd, &port->upstream);
258 name = g_strdup_printf("tz-ppc-port[%d]", i);
261 address_space_init(&port->downstream_as, port->downstream, name);
263 size = memory_region_size(port->downstream);
264 memory_region_init_io(&port->upstream, obj, &tz_ppc_ops,
266 sysbus_init_mmio(sbd, &port->upstream);
271 static const VMStateDescription tz_ppc_vmstate = {
274 .minimum_version_id = 1,
275 .fields = (VMStateField[]) {
276 VMSTATE_BOOL_ARRAY(cfg_nonsec, TZPPC, 16),
277 VMSTATE_BOOL_ARRAY(cfg_ap, TZPPC, 16),
278 VMSTATE_BOOL(cfg_sec_resp, TZPPC),
279 VMSTATE_BOOL(irq_enable, TZPPC),
280 VMSTATE_BOOL(irq_clear, TZPPC),
281 VMSTATE_BOOL(irq_status, TZPPC),
282 VMSTATE_END_OF_LIST()
286 #define DEFINE_PORT(N) \
287 DEFINE_PROP_LINK("port[" #N "]", TZPPC, port[N].downstream, \
288 TYPE_MEMORY_REGION, MemoryRegion *)
290 static Property tz_ppc_properties[] = {
291 DEFINE_PROP_UINT32("NONSEC_MASK", TZPPC, nonsec_mask, 0),
308 DEFINE_PROP_END_OF_LIST(),
311 static void tz_ppc_class_init(ObjectClass *klass, void *data)
313 DeviceClass *dc = DEVICE_CLASS(klass);
315 dc->realize = tz_ppc_realize;
316 dc->vmsd = &tz_ppc_vmstate;
317 dc->reset = tz_ppc_reset;
318 dc->props = tz_ppc_properties;
321 static const TypeInfo tz_ppc_info = {
323 .parent = TYPE_SYS_BUS_DEVICE,
324 .instance_size = sizeof(TZPPC),
325 .instance_init = tz_ppc_init,
326 .class_init = tz_ppc_class_init,
329 static void tz_ppc_register_types(void)
331 type_register_static(&tz_ppc_info);
334 type_init(tz_ppc_register_types);