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1
2 /*
3 * QEMU model of the Ibex SPI Controller
4 * SPEC Reference: https://docs.opentitan.org/hw/ip/spi_host/doc/
5 *
6 * Copyright (C) 2022 Western Digital
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #ifndef IBEX_SPI_HOST_H
28 #define IBEX_SPI_HOST_H
29
30 #include "hw/core/sysbus.h"
31 #include "hw/ssi/ssi.h"
32 #include "qemu/fifo8.h"
33 #include "qom/object.h"
34 #include "qemu/timer.h"
35
36 #define TYPE_IBEX_SPI_HOST "ibex-spi"
37 #define IBEX_SPI_HOST(obj) \
38 OBJECT_CHECK(IbexSPIHostState, (obj), TYPE_IBEX_SPI_HOST)
39
40 /* SPI Registers */
41 #define IBEX_SPI_HOST_INTR_STATE (0x00 / 4) /* rw1c */
42 #define IBEX_SPI_HOST_INTR_ENABLE (0x04 / 4) /* rw */
43 #define IBEX_SPI_HOST_INTR_TEST (0x08 / 4) /* wo */
44 #define IBEX_SPI_HOST_ALERT_TEST (0x0c / 4) /* wo */
45 #define IBEX_SPI_HOST_CONTROL (0x10 / 4) /* rw */
46 #define IBEX_SPI_HOST_STATUS (0x14 / 4) /* ro */
47 #define IBEX_SPI_HOST_CONFIGOPTS (0x18 / 4) /* rw */
48 #define IBEX_SPI_HOST_CSID (0x1c / 4) /* rw */
49 #define IBEX_SPI_HOST_COMMAND (0x20 / 4) /* wo */
50 /* RX/TX Modelled by FIFO */
51 #define IBEX_SPI_HOST_RXDATA (0x24 / 4)
52 #define IBEX_SPI_HOST_TXDATA (0x28 / 4)
53
54 #define IBEX_SPI_HOST_ERROR_ENABLE (0x2c / 4) /* rw */
55 #define IBEX_SPI_HOST_ERROR_STATUS (0x30 / 4) /* rw1c */
56 #define IBEX_SPI_HOST_EVENT_ENABLE (0x34 / 4) /* rw */
57
58 /* FIFO Len in Bytes */
59 #define IBEX_SPI_HOST_TXFIFO_LEN 288
60 #define IBEX_SPI_HOST_RXFIFO_LEN 256
61
62 /* Max Register (Based on addr) */
63 #define IBEX_SPI_HOST_MAX_REGS (IBEX_SPI_HOST_EVENT_ENABLE + 1)
64
65 /* MISC */
66 #define TX_INTERRUPT_TRIGGER_DELAY_NS 100
67 #define BIDIRECTIONAL_TRANSFER 3
68
69 typedef struct {
70 /* <private> */
71 SysBusDevice parent_obj;
72
73 /* <public> */
74 MemoryRegion mmio;
75 uint32_t regs[IBEX_SPI_HOST_MAX_REGS];
76 /* Multi-reg that sets config opts per CS */
77 uint32_t *config_opts;
78 Fifo8 rx_fifo;
79 Fifo8 tx_fifo;
80 QEMUTimer *fifo_trigger_handle;
81
82 qemu_irq event;
83 qemu_irq host_err;
84 uint32_t num_cs;
85 qemu_irq *cs_lines;
86 SSIBus *ssi;
87
88 /* Used to track the init status, for replicating TXDATA ghost writes */
89 bool init_status;
90 } IbexSPIHostState;
91
92 #endif