xref: /openbmc/qemu/hw/sd/npcm7xx_sdhci.c (revision c700d068)
1 /*
2  * NPCM7xx SD-3.0 / eMMC-4.51 Host Controller
3  *
4  * Copyright (c) 2021 Google LLC
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14  * for more details.
15  */
16 
17 #include "qemu/osdep.h"
18 
19 #include "hw/sd/sdhci.h"
20 #include "hw/sd/npcm7xx_sdhci.h"
21 #include "migration/vmstate.h"
22 #include "sdhci-internal.h"
23 #include "qemu/log.h"
24 
25 static uint64_t npcm7xx_sdhci_read(void *opaque, hwaddr addr, unsigned int size)
26 {
27     NPCM7xxSDHCIState *s = opaque;
28     uint64_t val = 0;
29 
30     switch (addr) {
31     case NPCM7XX_PRSTVALS_0:
32     case NPCM7XX_PRSTVALS_1:
33     case NPCM7XX_PRSTVALS_2:
34     case NPCM7XX_PRSTVALS_3:
35     case NPCM7XX_PRSTVALS_4:
36     case NPCM7XX_PRSTVALS_5:
37         val = s->regs.prstvals[(addr - NPCM7XX_PRSTVALS_0) / 2];
38         break;
39     case NPCM7XX_BOOTTOCTRL:
40         val = s->regs.boottoctrl;
41         break;
42     default:
43         qemu_log_mask(LOG_GUEST_ERROR, "SDHCI read of nonexistent reg: 0x%02"
44                       HWADDR_PRIx, addr);
45         break;
46     }
47 
48     return val;
49 }
50 
51 static void npcm7xx_sdhci_write(void *opaque, hwaddr addr, uint64_t val,
52                                 unsigned int size)
53 {
54     NPCM7xxSDHCIState *s = opaque;
55 
56     switch (addr) {
57     case NPCM7XX_BOOTTOCTRL:
58         s->regs.boottoctrl = val;
59         break;
60     default:
61         qemu_log_mask(LOG_GUEST_ERROR, "SDHCI write of nonexistent reg: 0x%02"
62                       HWADDR_PRIx, addr);
63         break;
64     }
65 }
66 
67 static bool npcm7xx_sdhci_check_mem_op(void *opaque, hwaddr addr,
68                                        unsigned size, bool is_write,
69                                        MemTxAttrs attrs)
70 {
71     switch (addr) {
72     case NPCM7XX_PRSTVALS_0:
73     case NPCM7XX_PRSTVALS_1:
74     case NPCM7XX_PRSTVALS_2:
75     case NPCM7XX_PRSTVALS_3:
76     case NPCM7XX_PRSTVALS_4:
77     case NPCM7XX_PRSTVALS_5:
78         /* RO Word */
79         return !is_write && size == 2;
80     case NPCM7XX_BOOTTOCTRL:
81         /* R/W Dword */
82         return size == 4;
83     default:
84         return false;
85     }
86 }
87 
88 static const MemoryRegionOps npcm7xx_sdhci_ops = {
89     .read = npcm7xx_sdhci_read,
90     .write = npcm7xx_sdhci_write,
91     .endianness = DEVICE_NATIVE_ENDIAN,
92     .valid = {
93         .min_access_size = 1,
94         .max_access_size = 4,
95         .unaligned = false,
96         .accepts = npcm7xx_sdhci_check_mem_op,
97     },
98 };
99 
100 static void npcm7xx_sdhci_realize(DeviceState *dev, Error **errp)
101 {
102     NPCM7xxSDHCIState *s = NPCM7XX_SDHCI(dev);
103     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
104     SysBusDevice *sbd_sdhci = SYS_BUS_DEVICE(&s->sdhci);
105 
106     memory_region_init(&s->container, OBJECT(s),
107                        "npcm7xx.sdhci-container", 0x1000);
108     sysbus_init_mmio(sbd, &s->container);
109 
110     memory_region_init_io(&s->iomem, OBJECT(s), &npcm7xx_sdhci_ops, s,
111                           TYPE_NPCM7XX_SDHCI, NPCM7XX_SDHCI_REGSIZE);
112     memory_region_add_subregion_overlap(&s->container, NPCM7XX_PRSTVALS,
113                                         &s->iomem, 1);
114 
115     sysbus_realize(sbd_sdhci, errp);
116     memory_region_add_subregion(&s->container, 0,
117                                 sysbus_mmio_get_region(sbd_sdhci, 0));
118 
119     /* propagate irq and "sd-bus" from generic-sdhci */
120     sysbus_pass_irq(sbd, sbd_sdhci);
121     s->bus = qdev_get_child_bus(DEVICE(sbd_sdhci), "sd-bus");
122 
123     /* Set the read only preset values. */
124     memset(s->regs.prstvals, 0, sizeof(s->regs.prstvals));
125     s->regs.prstvals[0] = NPCM7XX_PRSTVALS_0_RESET;
126     s->regs.prstvals[1] = NPCM7XX_PRSTVALS_1_RESET;
127     s->regs.prstvals[3] = NPCM7XX_PRSTVALS_3_RESET;
128 }
129 
130 static void npcm7xx_sdhci_reset(DeviceState *dev)
131 {
132     NPCM7xxSDHCIState *s = NPCM7XX_SDHCI(dev);
133     device_cold_reset(DEVICE(&s->sdhci));
134     s->regs.boottoctrl = 0;
135 
136     s->sdhci.prnsts = NPCM7XX_PRSNTS_RESET;
137     s->sdhci.blkgap = NPCM7XX_BLKGAP_RESET;
138     s->sdhci.capareg = NPCM7XX_CAPAB_RESET;
139     s->sdhci.maxcurr = NPCM7XX_MAXCURR_RESET;
140     s->sdhci.version = NPCM7XX_HCVER_RESET;
141 }
142 
143 static const VMStateDescription vmstate_npcm7xx_sdhci = {
144     .name = TYPE_NPCM7XX_SDHCI,
145     .version_id = 0,
146     .fields = (const VMStateField[]) {
147         VMSTATE_UINT32(regs.boottoctrl, NPCM7xxSDHCIState),
148         VMSTATE_END_OF_LIST(),
149     },
150 };
151 
152 static void npcm7xx_sdhci_class_init(ObjectClass *classp, void *data)
153 {
154     DeviceClass *dc = DEVICE_CLASS(classp);
155 
156     dc->desc = "NPCM7xx SD/eMMC Host Controller";
157     dc->realize = npcm7xx_sdhci_realize;
158     device_class_set_legacy_reset(dc, npcm7xx_sdhci_reset);
159     dc->vmsd = &vmstate_npcm7xx_sdhci;
160 }
161 
162 static void npcm7xx_sdhci_instance_init(Object *obj)
163 {
164     NPCM7xxSDHCIState *s = NPCM7XX_SDHCI(obj);
165 
166     object_initialize_child(OBJECT(s), TYPE_SYSBUS_SDHCI, &s->sdhci,
167                             TYPE_SYSBUS_SDHCI);
168 }
169 
170 static const TypeInfo npcm7xx_sdhci_types[] = {
171     {
172         .name           = TYPE_NPCM7XX_SDHCI,
173         .parent         = TYPE_SYS_BUS_DEVICE,
174         .instance_size  = sizeof(NPCM7xxSDHCIState),
175         .instance_init  = npcm7xx_sdhci_instance_init,
176         .class_init     = npcm7xx_sdhci_class_init,
177     },
178 };
179 
180 DEFINE_TYPES(npcm7xx_sdhci_types)
181