root / hw / xilinx_spi.c @ a1bc20df
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1 | 929d1b52 | Peter A. G. Crosthwaite | /*
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2 | 929d1b52 | Peter A. G. Crosthwaite | * QEMU model of the Xilinx SPI Controller
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3 | 929d1b52 | Peter A. G. Crosthwaite | *
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4 | 929d1b52 | Peter A. G. Crosthwaite | * Copyright (C) 2010 Edgar E. Iglesias.
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5 | 929d1b52 | Peter A. G. Crosthwaite | * Copyright (C) 2012 Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
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6 | 929d1b52 | Peter A. G. Crosthwaite | * Copyright (C) 2012 PetaLogix
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7 | 929d1b52 | Peter A. G. Crosthwaite | *
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8 | 929d1b52 | Peter A. G. Crosthwaite | * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 | 929d1b52 | Peter A. G. Crosthwaite | * of this software and associated documentation files (the "Software"), to deal
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10 | 929d1b52 | Peter A. G. Crosthwaite | * in the Software without restriction, including without limitation the rights
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11 | 929d1b52 | Peter A. G. Crosthwaite | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 | 929d1b52 | Peter A. G. Crosthwaite | * copies of the Software, and to permit persons to whom the Software is
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13 | 929d1b52 | Peter A. G. Crosthwaite | * furnished to do so, subject to the following conditions:
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14 | 929d1b52 | Peter A. G. Crosthwaite | *
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15 | 929d1b52 | Peter A. G. Crosthwaite | * The above copyright notice and this permission notice shall be included in
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16 | 929d1b52 | Peter A. G. Crosthwaite | * all copies or substantial portions of the Software.
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17 | 929d1b52 | Peter A. G. Crosthwaite | *
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18 | 929d1b52 | Peter A. G. Crosthwaite | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 | 929d1b52 | Peter A. G. Crosthwaite | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 | 929d1b52 | Peter A. G. Crosthwaite | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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21 | 929d1b52 | Peter A. G. Crosthwaite | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 | 929d1b52 | Peter A. G. Crosthwaite | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 | 929d1b52 | Peter A. G. Crosthwaite | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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24 | 929d1b52 | Peter A. G. Crosthwaite | * THE SOFTWARE.
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25 | 929d1b52 | Peter A. G. Crosthwaite | */
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26 | 929d1b52 | Peter A. G. Crosthwaite | |
27 | 929d1b52 | Peter A. G. Crosthwaite | #include "sysbus.h" |
28 | 929d1b52 | Peter A. G. Crosthwaite | #include "sysemu.h" |
29 | 929d1b52 | Peter A. G. Crosthwaite | #include "qemu-log.h" |
30 | 929d1b52 | Peter A. G. Crosthwaite | #include "fifo.h" |
31 | 929d1b52 | Peter A. G. Crosthwaite | |
32 | 929d1b52 | Peter A. G. Crosthwaite | #include "ssi.h" |
33 | 929d1b52 | Peter A. G. Crosthwaite | |
34 | 929d1b52 | Peter A. G. Crosthwaite | #ifdef XILINX_SPI_ERR_DEBUG
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35 | 929d1b52 | Peter A. G. Crosthwaite | #define DB_PRINT(...) do { \ |
36 | 929d1b52 | Peter A. G. Crosthwaite | fprintf(stderr, ": %s: ", __func__); \
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37 | 929d1b52 | Peter A. G. Crosthwaite | fprintf(stderr, ## __VA_ARGS__); \ |
38 | 929d1b52 | Peter A. G. Crosthwaite | } while (0); |
39 | 929d1b52 | Peter A. G. Crosthwaite | #else
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40 | 929d1b52 | Peter A. G. Crosthwaite | #define DB_PRINT(...)
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41 | 929d1b52 | Peter A. G. Crosthwaite | #endif
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42 | 929d1b52 | Peter A. G. Crosthwaite | |
43 | 929d1b52 | Peter A. G. Crosthwaite | #define R_DGIER (0x1c / 4) |
44 | 929d1b52 | Peter A. G. Crosthwaite | #define R_DGIER_IE (1 << 31) |
45 | 929d1b52 | Peter A. G. Crosthwaite | |
46 | 929d1b52 | Peter A. G. Crosthwaite | #define R_IPISR (0x20 / 4) |
47 | 929d1b52 | Peter A. G. Crosthwaite | #define IRQ_DRR_NOT_EMPTY (1 << (31 - 23)) |
48 | 929d1b52 | Peter A. G. Crosthwaite | #define IRQ_DRR_OVERRUN (1 << (31 - 26)) |
49 | 929d1b52 | Peter A. G. Crosthwaite | #define IRQ_DRR_FULL (1 << (31 - 27)) |
50 | 929d1b52 | Peter A. G. Crosthwaite | #define IRQ_TX_FF_HALF_EMPTY (1 << 6) |
51 | 929d1b52 | Peter A. G. Crosthwaite | #define IRQ_DTR_UNDERRUN (1 << 3) |
52 | 929d1b52 | Peter A. G. Crosthwaite | #define IRQ_DTR_EMPTY (1 << (31 - 29)) |
53 | 929d1b52 | Peter A. G. Crosthwaite | |
54 | 929d1b52 | Peter A. G. Crosthwaite | #define R_IPIER (0x28 / 4) |
55 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SRR (0x40 / 4) |
56 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPICR (0x60 / 4) |
57 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPICR_TXFF_RST (1 << 5) |
58 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPICR_RXFF_RST (1 << 6) |
59 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPICR_MTI (1 << 8) |
60 | 929d1b52 | Peter A. G. Crosthwaite | |
61 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPISR (0x64 / 4) |
62 | 929d1b52 | Peter A. G. Crosthwaite | #define SR_TX_FULL (1 << 3) |
63 | 929d1b52 | Peter A. G. Crosthwaite | #define SR_TX_EMPTY (1 << 2) |
64 | 929d1b52 | Peter A. G. Crosthwaite | #define SR_RX_FULL (1 << 1) |
65 | 929d1b52 | Peter A. G. Crosthwaite | #define SR_RX_EMPTY (1 << 0) |
66 | 929d1b52 | Peter A. G. Crosthwaite | |
67 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPIDTR (0x68 / 4) |
68 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPIDRR (0x6C / 4) |
69 | 929d1b52 | Peter A. G. Crosthwaite | #define R_SPISSR (0x70 / 4) |
70 | 929d1b52 | Peter A. G. Crosthwaite | #define R_TX_FF_OCY (0x74 / 4) |
71 | 929d1b52 | Peter A. G. Crosthwaite | #define R_RX_FF_OCY (0x78 / 4) |
72 | 929d1b52 | Peter A. G. Crosthwaite | #define R_MAX (0x7C / 4) |
73 | 929d1b52 | Peter A. G. Crosthwaite | |
74 | 929d1b52 | Peter A. G. Crosthwaite | #define FIFO_CAPACITY 256 |
75 | 929d1b52 | Peter A. G. Crosthwaite | |
76 | 929d1b52 | Peter A. G. Crosthwaite | typedef struct XilinxSPI { |
77 | 929d1b52 | Peter A. G. Crosthwaite | SysBusDevice busdev; |
78 | 929d1b52 | Peter A. G. Crosthwaite | MemoryRegion mmio; |
79 | 929d1b52 | Peter A. G. Crosthwaite | |
80 | 929d1b52 | Peter A. G. Crosthwaite | qemu_irq irq; |
81 | 929d1b52 | Peter A. G. Crosthwaite | int irqline;
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82 | 929d1b52 | Peter A. G. Crosthwaite | |
83 | 929d1b52 | Peter A. G. Crosthwaite | uint8_t num_cs; |
84 | 929d1b52 | Peter A. G. Crosthwaite | qemu_irq *cs_lines; |
85 | 929d1b52 | Peter A. G. Crosthwaite | |
86 | 929d1b52 | Peter A. G. Crosthwaite | SSIBus *spi; |
87 | 929d1b52 | Peter A. G. Crosthwaite | |
88 | 929d1b52 | Peter A. G. Crosthwaite | Fifo8 rx_fifo; |
89 | 929d1b52 | Peter A. G. Crosthwaite | Fifo8 tx_fifo; |
90 | 929d1b52 | Peter A. G. Crosthwaite | |
91 | 929d1b52 | Peter A. G. Crosthwaite | uint32_t regs[R_MAX]; |
92 | 929d1b52 | Peter A. G. Crosthwaite | } XilinxSPI; |
93 | 929d1b52 | Peter A. G. Crosthwaite | |
94 | 929d1b52 | Peter A. G. Crosthwaite | static void txfifo_reset(XilinxSPI *s) |
95 | 929d1b52 | Peter A. G. Crosthwaite | { |
96 | 929d1b52 | Peter A. G. Crosthwaite | fifo8_reset(&s->tx_fifo); |
97 | 929d1b52 | Peter A. G. Crosthwaite | |
98 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] &= ~SR_TX_FULL; |
99 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] |= SR_TX_EMPTY; |
100 | 929d1b52 | Peter A. G. Crosthwaite | } |
101 | 929d1b52 | Peter A. G. Crosthwaite | |
102 | 929d1b52 | Peter A. G. Crosthwaite | static void rxfifo_reset(XilinxSPI *s) |
103 | 929d1b52 | Peter A. G. Crosthwaite | { |
104 | 929d1b52 | Peter A. G. Crosthwaite | fifo8_reset(&s->rx_fifo); |
105 | 929d1b52 | Peter A. G. Crosthwaite | |
106 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] |= SR_RX_EMPTY; |
107 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] &= ~SR_RX_FULL; |
108 | 929d1b52 | Peter A. G. Crosthwaite | } |
109 | 929d1b52 | Peter A. G. Crosthwaite | |
110 | 929d1b52 | Peter A. G. Crosthwaite | static void xlx_spi_update_cs(XilinxSPI *s) |
111 | 929d1b52 | Peter A. G. Crosthwaite | { |
112 | 929d1b52 | Peter A. G. Crosthwaite | int i;
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113 | 929d1b52 | Peter A. G. Crosthwaite | |
114 | 929d1b52 | Peter A. G. Crosthwaite | for (i = 0; i < s->num_cs; ++i) { |
115 | 929d1b52 | Peter A. G. Crosthwaite | qemu_set_irq(s->cs_lines[i], !(~s->regs[R_SPISSR] & 1 << i));
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116 | 929d1b52 | Peter A. G. Crosthwaite | } |
117 | 929d1b52 | Peter A. G. Crosthwaite | } |
118 | 929d1b52 | Peter A. G. Crosthwaite | |
119 | 929d1b52 | Peter A. G. Crosthwaite | static void xlx_spi_update_irq(XilinxSPI *s) |
120 | 929d1b52 | Peter A. G. Crosthwaite | { |
121 | 929d1b52 | Peter A. G. Crosthwaite | uint32_t pending; |
122 | 929d1b52 | Peter A. G. Crosthwaite | |
123 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_IPISR] |= |
124 | 929d1b52 | Peter A. G. Crosthwaite | (!fifo8_is_empty(&s->rx_fifo) ? IRQ_DRR_NOT_EMPTY : 0) |
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125 | 929d1b52 | Peter A. G. Crosthwaite | (fifo8_is_full(&s->rx_fifo) ? IRQ_DRR_FULL : 0);
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126 | 929d1b52 | Peter A. G. Crosthwaite | |
127 | 929d1b52 | Peter A. G. Crosthwaite | pending = s->regs[R_IPISR] & s->regs[R_IPIER]; |
128 | 929d1b52 | Peter A. G. Crosthwaite | |
129 | 929d1b52 | Peter A. G. Crosthwaite | pending = pending && (s->regs[R_DGIER] & R_DGIER_IE); |
130 | 929d1b52 | Peter A. G. Crosthwaite | pending = !!pending; |
131 | 929d1b52 | Peter A. G. Crosthwaite | |
132 | 929d1b52 | Peter A. G. Crosthwaite | /* This call lies right in the data paths so don't call the
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133 | 929d1b52 | Peter A. G. Crosthwaite | irq chain unless things really changed. */
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134 | 929d1b52 | Peter A. G. Crosthwaite | if (pending != s->irqline) {
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135 | 929d1b52 | Peter A. G. Crosthwaite | s->irqline = pending; |
136 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("irq_change of state %d ISR:%x IER:%X\n",
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137 | 929d1b52 | Peter A. G. Crosthwaite | pending, s->regs[R_IPISR], s->regs[R_IPIER]); |
138 | 929d1b52 | Peter A. G. Crosthwaite | qemu_set_irq(s->irq, pending); |
139 | 929d1b52 | Peter A. G. Crosthwaite | } |
140 | 929d1b52 | Peter A. G. Crosthwaite | |
141 | 929d1b52 | Peter A. G. Crosthwaite | } |
142 | 929d1b52 | Peter A. G. Crosthwaite | |
143 | 929d1b52 | Peter A. G. Crosthwaite | static void xlx_spi_do_reset(XilinxSPI *s) |
144 | 929d1b52 | Peter A. G. Crosthwaite | { |
145 | 929d1b52 | Peter A. G. Crosthwaite | memset(s->regs, 0, sizeof s->regs); |
146 | 929d1b52 | Peter A. G. Crosthwaite | |
147 | 929d1b52 | Peter A. G. Crosthwaite | rxfifo_reset(s); |
148 | 929d1b52 | Peter A. G. Crosthwaite | txfifo_reset(s); |
149 | 929d1b52 | Peter A. G. Crosthwaite | |
150 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISSR] = ~0;
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151 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_update_irq(s); |
152 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_update_cs(s); |
153 | 929d1b52 | Peter A. G. Crosthwaite | } |
154 | 929d1b52 | Peter A. G. Crosthwaite | |
155 | 929d1b52 | Peter A. G. Crosthwaite | static void xlx_spi_reset(DeviceState *d) |
156 | 929d1b52 | Peter A. G. Crosthwaite | { |
157 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_do_reset(DO_UPCAST(XilinxSPI, busdev.qdev, d)); |
158 | 929d1b52 | Peter A. G. Crosthwaite | } |
159 | 929d1b52 | Peter A. G. Crosthwaite | |
160 | 929d1b52 | Peter A. G. Crosthwaite | static inline int spi_master_enabled(XilinxSPI *s) |
161 | 929d1b52 | Peter A. G. Crosthwaite | { |
162 | 929d1b52 | Peter A. G. Crosthwaite | return !(s->regs[R_SPICR] & R_SPICR_MTI);
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163 | 929d1b52 | Peter A. G. Crosthwaite | } |
164 | 929d1b52 | Peter A. G. Crosthwaite | |
165 | 929d1b52 | Peter A. G. Crosthwaite | static void spi_flush_txfifo(XilinxSPI *s) |
166 | 929d1b52 | Peter A. G. Crosthwaite | { |
167 | 929d1b52 | Peter A. G. Crosthwaite | uint32_t tx; |
168 | 929d1b52 | Peter A. G. Crosthwaite | uint32_t rx; |
169 | 929d1b52 | Peter A. G. Crosthwaite | |
170 | 929d1b52 | Peter A. G. Crosthwaite | while (!fifo8_is_empty(&s->tx_fifo)) {
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171 | 929d1b52 | Peter A. G. Crosthwaite | tx = (uint32_t)fifo8_pop(&s->tx_fifo); |
172 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("data tx:%x\n", tx);
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173 | 929d1b52 | Peter A. G. Crosthwaite | rx = ssi_transfer(s->spi, tx); |
174 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("data rx:%x\n", rx);
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175 | 929d1b52 | Peter A. G. Crosthwaite | if (fifo8_is_full(&s->rx_fifo)) {
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176 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_IPISR] |= IRQ_DRR_OVERRUN; |
177 | 929d1b52 | Peter A. G. Crosthwaite | } else {
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178 | 929d1b52 | Peter A. G. Crosthwaite | fifo8_push(&s->rx_fifo, (uint8_t)rx); |
179 | 929d1b52 | Peter A. G. Crosthwaite | if (fifo8_is_full(&s->rx_fifo)) {
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180 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] |= SR_RX_FULL; |
181 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_IPISR] |= IRQ_DRR_FULL; |
182 | 929d1b52 | Peter A. G. Crosthwaite | } |
183 | 929d1b52 | Peter A. G. Crosthwaite | } |
184 | 929d1b52 | Peter A. G. Crosthwaite | |
185 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] &= ~SR_RX_EMPTY; |
186 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] &= ~SR_TX_FULL; |
187 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] |= SR_TX_EMPTY; |
188 | 929d1b52 | Peter A. G. Crosthwaite | |
189 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_IPISR] |= IRQ_DTR_EMPTY; |
190 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_IPISR] |= IRQ_DRR_NOT_EMPTY; |
191 | 929d1b52 | Peter A. G. Crosthwaite | } |
192 | 929d1b52 | Peter A. G. Crosthwaite | |
193 | 929d1b52 | Peter A. G. Crosthwaite | } |
194 | 929d1b52 | Peter A. G. Crosthwaite | |
195 | 929d1b52 | Peter A. G. Crosthwaite | static uint64_t
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196 | a8170e5e | Avi Kivity | spi_read(void *opaque, hwaddr addr, unsigned int size) |
197 | 929d1b52 | Peter A. G. Crosthwaite | { |
198 | 929d1b52 | Peter A. G. Crosthwaite | XilinxSPI *s = opaque; |
199 | 929d1b52 | Peter A. G. Crosthwaite | uint32_t r = 0;
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200 | 929d1b52 | Peter A. G. Crosthwaite | |
201 | 929d1b52 | Peter A. G. Crosthwaite | addr >>= 2;
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202 | 929d1b52 | Peter A. G. Crosthwaite | switch (addr) {
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203 | 929d1b52 | Peter A. G. Crosthwaite | case R_SPIDRR:
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204 | 929d1b52 | Peter A. G. Crosthwaite | if (fifo8_is_empty(&s->rx_fifo)) {
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205 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("Read from empty FIFO!\n");
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206 | 929d1b52 | Peter A. G. Crosthwaite | return 0xdeadbeef; |
207 | 929d1b52 | Peter A. G. Crosthwaite | } |
208 | 929d1b52 | Peter A. G. Crosthwaite | |
209 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] &= ~SR_RX_FULL; |
210 | 929d1b52 | Peter A. G. Crosthwaite | r = fifo8_pop(&s->rx_fifo); |
211 | 929d1b52 | Peter A. G. Crosthwaite | if (fifo8_is_empty(&s->rx_fifo)) {
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212 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] |= SR_RX_EMPTY; |
213 | 929d1b52 | Peter A. G. Crosthwaite | } |
214 | 929d1b52 | Peter A. G. Crosthwaite | break;
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215 | 929d1b52 | Peter A. G. Crosthwaite | |
216 | 929d1b52 | Peter A. G. Crosthwaite | case R_SPISR:
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217 | 929d1b52 | Peter A. G. Crosthwaite | r = s->regs[addr]; |
218 | 929d1b52 | Peter A. G. Crosthwaite | break;
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219 | 929d1b52 | Peter A. G. Crosthwaite | |
220 | 929d1b52 | Peter A. G. Crosthwaite | default:
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221 | 929d1b52 | Peter A. G. Crosthwaite | if (addr < ARRAY_SIZE(s->regs)) {
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222 | 929d1b52 | Peter A. G. Crosthwaite | r = s->regs[addr]; |
223 | 929d1b52 | Peter A. G. Crosthwaite | } |
224 | 929d1b52 | Peter A. G. Crosthwaite | break;
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225 | 929d1b52 | Peter A. G. Crosthwaite | |
226 | 929d1b52 | Peter A. G. Crosthwaite | } |
227 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr * 4, r); |
228 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_update_irq(s); |
229 | 929d1b52 | Peter A. G. Crosthwaite | return r;
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230 | 929d1b52 | Peter A. G. Crosthwaite | } |
231 | 929d1b52 | Peter A. G. Crosthwaite | |
232 | 929d1b52 | Peter A. G. Crosthwaite | static void |
233 | a8170e5e | Avi Kivity | spi_write(void *opaque, hwaddr addr,
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234 | 929d1b52 | Peter A. G. Crosthwaite | uint64_t val64, unsigned int size) |
235 | 929d1b52 | Peter A. G. Crosthwaite | { |
236 | 929d1b52 | Peter A. G. Crosthwaite | XilinxSPI *s = opaque; |
237 | 929d1b52 | Peter A. G. Crosthwaite | uint32_t value = val64; |
238 | 929d1b52 | Peter A. G. Crosthwaite | |
239 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr, value); |
240 | 929d1b52 | Peter A. G. Crosthwaite | addr >>= 2;
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241 | 929d1b52 | Peter A. G. Crosthwaite | switch (addr) {
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242 | 929d1b52 | Peter A. G. Crosthwaite | case R_SRR:
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243 | 929d1b52 | Peter A. G. Crosthwaite | if (value != 0xa) { |
244 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("Invalid write to SRR %x\n", value);
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245 | 929d1b52 | Peter A. G. Crosthwaite | } else {
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246 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_do_reset(s); |
247 | 929d1b52 | Peter A. G. Crosthwaite | } |
248 | 929d1b52 | Peter A. G. Crosthwaite | break;
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249 | 929d1b52 | Peter A. G. Crosthwaite | |
250 | 929d1b52 | Peter A. G. Crosthwaite | case R_SPIDTR:
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251 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] &= ~SR_TX_EMPTY; |
252 | 929d1b52 | Peter A. G. Crosthwaite | fifo8_push(&s->tx_fifo, (uint8_t)value); |
253 | 929d1b52 | Peter A. G. Crosthwaite | if (fifo8_is_full(&s->tx_fifo)) {
|
254 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[R_SPISR] |= SR_TX_FULL; |
255 | 929d1b52 | Peter A. G. Crosthwaite | } |
256 | 929d1b52 | Peter A. G. Crosthwaite | if (!spi_master_enabled(s)) {
|
257 | 929d1b52 | Peter A. G. Crosthwaite | goto done;
|
258 | 929d1b52 | Peter A. G. Crosthwaite | } else {
|
259 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("DTR and master enabled\n");
|
260 | 929d1b52 | Peter A. G. Crosthwaite | } |
261 | 929d1b52 | Peter A. G. Crosthwaite | spi_flush_txfifo(s); |
262 | 929d1b52 | Peter A. G. Crosthwaite | break;
|
263 | 929d1b52 | Peter A. G. Crosthwaite | |
264 | 929d1b52 | Peter A. G. Crosthwaite | case R_SPISR:
|
265 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("Invalid write to SPISR %x\n", value);
|
266 | 929d1b52 | Peter A. G. Crosthwaite | break;
|
267 | 929d1b52 | Peter A. G. Crosthwaite | |
268 | 929d1b52 | Peter A. G. Crosthwaite | case R_IPISR:
|
269 | 929d1b52 | Peter A. G. Crosthwaite | /* Toggle the bits. */
|
270 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[addr] ^= value; |
271 | 929d1b52 | Peter A. G. Crosthwaite | break;
|
272 | 929d1b52 | Peter A. G. Crosthwaite | |
273 | 929d1b52 | Peter A. G. Crosthwaite | /* Slave Select Register. */
|
274 | 929d1b52 | Peter A. G. Crosthwaite | case R_SPISSR:
|
275 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[addr] = value; |
276 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_update_cs(s); |
277 | 929d1b52 | Peter A. G. Crosthwaite | break;
|
278 | 929d1b52 | Peter A. G. Crosthwaite | |
279 | 929d1b52 | Peter A. G. Crosthwaite | case R_SPICR:
|
280 | 929d1b52 | Peter A. G. Crosthwaite | /* FIXME: reset irq and sr state to empty queues. */
|
281 | 929d1b52 | Peter A. G. Crosthwaite | if (value & R_SPICR_RXFF_RST) {
|
282 | 929d1b52 | Peter A. G. Crosthwaite | rxfifo_reset(s); |
283 | 929d1b52 | Peter A. G. Crosthwaite | } |
284 | 929d1b52 | Peter A. G. Crosthwaite | |
285 | 929d1b52 | Peter A. G. Crosthwaite | if (value & R_SPICR_TXFF_RST) {
|
286 | 929d1b52 | Peter A. G. Crosthwaite | txfifo_reset(s); |
287 | 929d1b52 | Peter A. G. Crosthwaite | } |
288 | 929d1b52 | Peter A. G. Crosthwaite | value &= ~(R_SPICR_RXFF_RST | R_SPICR_TXFF_RST); |
289 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[addr] = value; |
290 | 929d1b52 | Peter A. G. Crosthwaite | |
291 | 929d1b52 | Peter A. G. Crosthwaite | if (!(value & R_SPICR_MTI)) {
|
292 | 929d1b52 | Peter A. G. Crosthwaite | spi_flush_txfifo(s); |
293 | 929d1b52 | Peter A. G. Crosthwaite | } |
294 | 929d1b52 | Peter A. G. Crosthwaite | break;
|
295 | 929d1b52 | Peter A. G. Crosthwaite | |
296 | 929d1b52 | Peter A. G. Crosthwaite | default:
|
297 | 929d1b52 | Peter A. G. Crosthwaite | if (addr < ARRAY_SIZE(s->regs)) {
|
298 | 929d1b52 | Peter A. G. Crosthwaite | s->regs[addr] = value; |
299 | 929d1b52 | Peter A. G. Crosthwaite | } |
300 | 929d1b52 | Peter A. G. Crosthwaite | break;
|
301 | 929d1b52 | Peter A. G. Crosthwaite | } |
302 | 929d1b52 | Peter A. G. Crosthwaite | |
303 | 929d1b52 | Peter A. G. Crosthwaite | done:
|
304 | 929d1b52 | Peter A. G. Crosthwaite | xlx_spi_update_irq(s); |
305 | 929d1b52 | Peter A. G. Crosthwaite | } |
306 | 929d1b52 | Peter A. G. Crosthwaite | |
307 | 929d1b52 | Peter A. G. Crosthwaite | static const MemoryRegionOps spi_ops = { |
308 | 929d1b52 | Peter A. G. Crosthwaite | .read = spi_read, |
309 | 929d1b52 | Peter A. G. Crosthwaite | .write = spi_write, |
310 | 929d1b52 | Peter A. G. Crosthwaite | .endianness = DEVICE_NATIVE_ENDIAN, |
311 | 929d1b52 | Peter A. G. Crosthwaite | .valid = { |
312 | 929d1b52 | Peter A. G. Crosthwaite | .min_access_size = 4,
|
313 | 929d1b52 | Peter A. G. Crosthwaite | .max_access_size = 4
|
314 | 929d1b52 | Peter A. G. Crosthwaite | } |
315 | 929d1b52 | Peter A. G. Crosthwaite | }; |
316 | 929d1b52 | Peter A. G. Crosthwaite | |
317 | 929d1b52 | Peter A. G. Crosthwaite | static int xilinx_spi_init(SysBusDevice *dev) |
318 | 929d1b52 | Peter A. G. Crosthwaite | { |
319 | 929d1b52 | Peter A. G. Crosthwaite | int i;
|
320 | 929d1b52 | Peter A. G. Crosthwaite | XilinxSPI *s = FROM_SYSBUS(typeof(*s), dev); |
321 | 929d1b52 | Peter A. G. Crosthwaite | |
322 | 929d1b52 | Peter A. G. Crosthwaite | DB_PRINT("\n");
|
323 | b4ae3cfa | Peter Crosthwaite | |
324 | b4ae3cfa | Peter Crosthwaite | s->spi = ssi_create_bus(&dev->qdev, "spi");
|
325 | b4ae3cfa | Peter Crosthwaite | |
326 | 929d1b52 | Peter A. G. Crosthwaite | sysbus_init_irq(dev, &s->irq); |
327 | 929d1b52 | Peter A. G. Crosthwaite | s->cs_lines = g_new(qemu_irq, s->num_cs); |
328 | b4ae3cfa | Peter Crosthwaite | ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi); |
329 | 929d1b52 | Peter A. G. Crosthwaite | for (i = 0; i < s->num_cs; ++i) { |
330 | 929d1b52 | Peter A. G. Crosthwaite | sysbus_init_irq(dev, &s->cs_lines[i]); |
331 | 929d1b52 | Peter A. G. Crosthwaite | } |
332 | 929d1b52 | Peter A. G. Crosthwaite | |
333 | 929d1b52 | Peter A. G. Crosthwaite | memory_region_init_io(&s->mmio, &spi_ops, s, "xilinx-spi", R_MAX * 4); |
334 | 929d1b52 | Peter A. G. Crosthwaite | sysbus_init_mmio(dev, &s->mmio); |
335 | 929d1b52 | Peter A. G. Crosthwaite | |
336 | 929d1b52 | Peter A. G. Crosthwaite | s->irqline = -1;
|
337 | 929d1b52 | Peter A. G. Crosthwaite | |
338 | 929d1b52 | Peter A. G. Crosthwaite | fifo8_create(&s->tx_fifo, FIFO_CAPACITY); |
339 | 929d1b52 | Peter A. G. Crosthwaite | fifo8_create(&s->rx_fifo, FIFO_CAPACITY); |
340 | 929d1b52 | Peter A. G. Crosthwaite | |
341 | 929d1b52 | Peter A. G. Crosthwaite | return 0; |
342 | 929d1b52 | Peter A. G. Crosthwaite | } |
343 | 929d1b52 | Peter A. G. Crosthwaite | |
344 | 929d1b52 | Peter A. G. Crosthwaite | static const VMStateDescription vmstate_xilinx_spi = { |
345 | 929d1b52 | Peter A. G. Crosthwaite | .name = "xilinx_spi",
|
346 | 929d1b52 | Peter A. G. Crosthwaite | .version_id = 1,
|
347 | 929d1b52 | Peter A. G. Crosthwaite | .minimum_version_id = 1,
|
348 | 929d1b52 | Peter A. G. Crosthwaite | .minimum_version_id_old = 1,
|
349 | 929d1b52 | Peter A. G. Crosthwaite | .fields = (VMStateField[]) { |
350 | 929d1b52 | Peter A. G. Crosthwaite | VMSTATE_FIFO8(tx_fifo, XilinxSPI), |
351 | 929d1b52 | Peter A. G. Crosthwaite | VMSTATE_FIFO8(rx_fifo, XilinxSPI), |
352 | 929d1b52 | Peter A. G. Crosthwaite | VMSTATE_UINT32_ARRAY(regs, XilinxSPI, R_MAX), |
353 | 929d1b52 | Peter A. G. Crosthwaite | VMSTATE_END_OF_LIST() |
354 | 929d1b52 | Peter A. G. Crosthwaite | } |
355 | 929d1b52 | Peter A. G. Crosthwaite | }; |
356 | 929d1b52 | Peter A. G. Crosthwaite | |
357 | 929d1b52 | Peter A. G. Crosthwaite | static Property xilinx_spi_properties[] = {
|
358 | 929d1b52 | Peter A. G. Crosthwaite | DEFINE_PROP_UINT8("num-ss-bits", XilinxSPI, num_cs, 1), |
359 | 929d1b52 | Peter A. G. Crosthwaite | DEFINE_PROP_END_OF_LIST(), |
360 | 929d1b52 | Peter A. G. Crosthwaite | }; |
361 | 929d1b52 | Peter A. G. Crosthwaite | |
362 | 929d1b52 | Peter A. G. Crosthwaite | static void xilinx_spi_class_init(ObjectClass *klass, void *data) |
363 | 929d1b52 | Peter A. G. Crosthwaite | { |
364 | 929d1b52 | Peter A. G. Crosthwaite | DeviceClass *dc = DEVICE_CLASS(klass); |
365 | 929d1b52 | Peter A. G. Crosthwaite | SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
366 | 929d1b52 | Peter A. G. Crosthwaite | |
367 | 929d1b52 | Peter A. G. Crosthwaite | k->init = xilinx_spi_init; |
368 | 929d1b52 | Peter A. G. Crosthwaite | dc->reset = xlx_spi_reset; |
369 | 929d1b52 | Peter A. G. Crosthwaite | dc->props = xilinx_spi_properties; |
370 | 929d1b52 | Peter A. G. Crosthwaite | dc->vmsd = &vmstate_xilinx_spi; |
371 | 929d1b52 | Peter A. G. Crosthwaite | } |
372 | 929d1b52 | Peter A. G. Crosthwaite | |
373 | 929d1b52 | Peter A. G. Crosthwaite | static TypeInfo xilinx_spi_info = {
|
374 | 929d1b52 | Peter A. G. Crosthwaite | .name = "xlnx.xps-spi",
|
375 | 929d1b52 | Peter A. G. Crosthwaite | .parent = TYPE_SYS_BUS_DEVICE, |
376 | 929d1b52 | Peter A. G. Crosthwaite | .instance_size = sizeof(XilinxSPI),
|
377 | 929d1b52 | Peter A. G. Crosthwaite | .class_init = xilinx_spi_class_init, |
378 | 929d1b52 | Peter A. G. Crosthwaite | }; |
379 | 929d1b52 | Peter A. G. Crosthwaite | |
380 | 929d1b52 | Peter A. G. Crosthwaite | static void xilinx_spi_register_types(void) |
381 | 929d1b52 | Peter A. G. Crosthwaite | { |
382 | 929d1b52 | Peter A. G. Crosthwaite | type_register_static(&xilinx_spi_info); |
383 | 929d1b52 | Peter A. G. Crosthwaite | } |
384 | 929d1b52 | Peter A. G. Crosthwaite | |
385 | 929d1b52 | Peter A. G. Crosthwaite | type_init(xilinx_spi_register_types) |