Merge remote-tracking branch 'remotes/philmd-gitlab/tags/renesas-20201027' into staging
[qemu.git] / hw / char / omap_uart.c
1 /*
2 * TI OMAP processors UART emulation.
3 *
4 * Copyright (C) 2006-2008 Andrzej Zaborowski <balrog@zabor.org>
5 * Copyright (C) 2007-2009 Nokia Corporation
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 or
10 * (at your option) version 3 of the License.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20 #include "qemu/osdep.h"
21 #include "chardev/char.h"
22 #include "hw/arm/omap.h"
23 #include "hw/char/serial.h"
24 #include "exec/address-spaces.h"
25
26 /* UARTs */
27 struct omap_uart_s {
28 MemoryRegion iomem;
29 hwaddr base;
30 SerialMM *serial; /* TODO */
31 struct omap_target_agent_s *ta;
32 omap_clk fclk;
33 qemu_irq irq;
34
35 uint8_t eblr;
36 uint8_t syscontrol;
37 uint8_t wkup;
38 uint8_t cfps;
39 uint8_t mdr[2];
40 uint8_t scr;
41 uint8_t clksel;
42 };
43
44 void omap_uart_reset(struct omap_uart_s *s)
45 {
46 s->eblr = 0x00;
47 s->syscontrol = 0;
48 s->wkup = 0x3f;
49 s->cfps = 0x69;
50 s->clksel = 0;
51 }
52
53 struct omap_uart_s *omap_uart_init(hwaddr base,
54 qemu_irq irq, omap_clk fclk, omap_clk iclk,
55 qemu_irq txdma, qemu_irq rxdma,
56 const char *label, Chardev *chr)
57 {
58 struct omap_uart_s *s = g_new0(struct omap_uart_s, 1);
59
60 s->base = base;
61 s->fclk = fclk;
62 s->irq = irq;
63 s->serial = serial_mm_init(get_system_memory(), base, 2, irq,
64 omap_clk_getrate(fclk)/16,
65 chr ?: qemu_chr_new(label, "null", NULL),
66 DEVICE_NATIVE_ENDIAN);
67 return s;
68 }
69
70 static uint64_t omap_uart_read(void *opaque, hwaddr addr,
71 unsigned size)
72 {
73 struct omap_uart_s *s = (struct omap_uart_s *) opaque;
74
75 if (size == 4) {
76 return omap_badwidth_read8(opaque, addr);
77 }
78
79 switch (addr) {
80 case 0x20: /* MDR1 */
81 return s->mdr[0];
82 case 0x24: /* MDR2 */
83 return s->mdr[1];
84 case 0x40: /* SCR */
85 return s->scr;
86 case 0x44: /* SSR */
87 return 0x0;
88 case 0x48: /* EBLR (OMAP2) */
89 return s->eblr;
90 case 0x4C: /* OSC_12M_SEL (OMAP1) */
91 return s->clksel;
92 case 0x50: /* MVR */
93 return 0x30;
94 case 0x54: /* SYSC (OMAP2) */
95 return s->syscontrol;
96 case 0x58: /* SYSS (OMAP2) */
97 return 1;
98 case 0x5c: /* WER (OMAP2) */
99 return s->wkup;
100 case 0x60: /* CFPS (OMAP2) */
101 return s->cfps;
102 }
103
104 OMAP_BAD_REG(addr);
105 return 0;
106 }
107
108 static void omap_uart_write(void *opaque, hwaddr addr,
109 uint64_t value, unsigned size)
110 {
111 struct omap_uart_s *s = (struct omap_uart_s *) opaque;
112
113 if (size == 4) {
114 omap_badwidth_write8(opaque, addr, value);
115 return;
116 }
117
118 switch (addr) {
119 case 0x20: /* MDR1 */
120 s->mdr[0] = value & 0x7f;
121 break;
122 case 0x24: /* MDR2 */
123 s->mdr[1] = value & 0xff;
124 break;
125 case 0x40: /* SCR */
126 s->scr = value & 0xff;
127 break;
128 case 0x48: /* EBLR (OMAP2) */
129 s->eblr = value & 0xff;
130 break;
131 case 0x4C: /* OSC_12M_SEL (OMAP1) */
132 s->clksel = value & 1;
133 break;
134 case 0x44: /* SSR */
135 case 0x50: /* MVR */
136 case 0x58: /* SYSS (OMAP2) */
137 OMAP_RO_REG(addr);
138 break;
139 case 0x54: /* SYSC (OMAP2) */
140 s->syscontrol = value & 0x1d;
141 if (value & 2)
142 omap_uart_reset(s);
143 break;
144 case 0x5c: /* WER (OMAP2) */
145 s->wkup = value & 0x7f;
146 break;
147 case 0x60: /* CFPS (OMAP2) */
148 s->cfps = value & 0xff;
149 break;
150 default:
151 OMAP_BAD_REG(addr);
152 }
153 }
154
155 static const MemoryRegionOps omap_uart_ops = {
156 .read = omap_uart_read,
157 .write = omap_uart_write,
158 .endianness = DEVICE_NATIVE_ENDIAN,
159 };
160
161 struct omap_uart_s *omap2_uart_init(MemoryRegion *sysmem,
162 struct omap_target_agent_s *ta,
163 qemu_irq irq, omap_clk fclk, omap_clk iclk,
164 qemu_irq txdma, qemu_irq rxdma,
165 const char *label, Chardev *chr)
166 {
167 hwaddr base = omap_l4_attach(ta, 0, NULL);
168 struct omap_uart_s *s = omap_uart_init(base, irq,
169 fclk, iclk, txdma, rxdma, label, chr);
170
171 memory_region_init_io(&s->iomem, NULL, &omap_uart_ops, s, "omap.uart", 0x100);
172
173 s->ta = ta;
174
175 memory_region_add_subregion(sysmem, base + 0x20, &s->iomem);
176
177 return s;
178 }
179
180 void omap_uart_attach(struct omap_uart_s *s, Chardev *chr)
181 {
182 /* TODO: Should reuse or destroy current s->serial */
183 s->serial = serial_mm_init(get_system_memory(), s->base, 2, s->irq,
184 omap_clk_getrate(s->fclk) / 16,
185 chr ?: qemu_chr_new("null", "null", NULL),
186 DEVICE_NATIVE_ENDIAN);
187 }