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 void tz_ppc_reset(DeviceState *dev)
186 TZPPC *s = TZ_PPC(dev);
188 trace_tz_ppc_reset();
189 s->cfg_sec_resp = false;
190 memset(s->cfg_nonsec, 0, sizeof(s->cfg_nonsec));
191 memset(s->cfg_ap, 0, sizeof(s->cfg_ap));
194 static void tz_ppc_init(Object *obj)
196 DeviceState *dev = DEVICE(obj);
197 TZPPC *s = TZ_PPC(obj);
199 qdev_init_gpio_in_named(dev, tz_ppc_cfg_nonsec, "cfg_nonsec", TZ_NUM_PORTS);
200 qdev_init_gpio_in_named(dev, tz_ppc_cfg_ap, "cfg_ap", TZ_NUM_PORTS);
201 qdev_init_gpio_in_named(dev, tz_ppc_cfg_sec_resp, "cfg_sec_resp", 1);
202 qdev_init_gpio_in_named(dev, tz_ppc_irq_enable, "irq_enable", 1);
203 qdev_init_gpio_in_named(dev, tz_ppc_irq_clear, "irq_clear", 1);
204 qdev_init_gpio_out_named(dev, &s->irq, "irq", 1);
207 static void tz_ppc_realize(DeviceState *dev, Error **errp)
209 Object *obj = OBJECT(dev);
210 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
211 TZPPC *s = TZ_PPC(dev);
214 /* We can't create the upstream end of the port until realize,
215 * as we don't know the size of the MR used as the downstream until then.
217 for (i = 0; i < TZ_NUM_PORTS; i++) {
218 TZPPCPort *port = &s->port[i];
222 if (!port->downstream) {
226 name = g_strdup_printf("tz-ppc-port[%d]", i);
229 address_space_init(&port->downstream_as, port->downstream, name);
231 size = memory_region_size(port->downstream);
232 memory_region_init_io(&port->upstream, obj, &tz_ppc_ops,
234 sysbus_init_mmio(sbd, &port->upstream);
239 static const VMStateDescription tz_ppc_vmstate = {
242 .minimum_version_id = 1,
243 .fields = (VMStateField[]) {
244 VMSTATE_BOOL_ARRAY(cfg_nonsec, TZPPC, 16),
245 VMSTATE_BOOL_ARRAY(cfg_ap, TZPPC, 16),
246 VMSTATE_BOOL(cfg_sec_resp, TZPPC),
247 VMSTATE_BOOL(irq_enable, TZPPC),
248 VMSTATE_BOOL(irq_clear, TZPPC),
249 VMSTATE_BOOL(irq_status, TZPPC),
250 VMSTATE_END_OF_LIST()
254 #define DEFINE_PORT(N) \
255 DEFINE_PROP_LINK("port[" #N "]", TZPPC, port[N].downstream, \
256 TYPE_MEMORY_REGION, MemoryRegion *)
258 static Property tz_ppc_properties[] = {
259 DEFINE_PROP_UINT32("NONSEC_MASK", TZPPC, nonsec_mask, 0),
276 DEFINE_PROP_END_OF_LIST(),
279 static void tz_ppc_class_init(ObjectClass *klass, void *data)
281 DeviceClass *dc = DEVICE_CLASS(klass);
283 dc->realize = tz_ppc_realize;
284 dc->vmsd = &tz_ppc_vmstate;
285 dc->reset = tz_ppc_reset;
286 dc->props = tz_ppc_properties;
289 static const TypeInfo tz_ppc_info = {
291 .parent = TYPE_SYS_BUS_DEVICE,
292 .instance_size = sizeof(TZPPC),
293 .instance_init = tz_ppc_init,
294 .class_init = tz_ppc_class_init,
297 static void tz_ppc_register_types(void)
299 type_register_static(&tz_ppc_info);
302 type_init(tz_ppc_register_types);