1
2
3
4
5
6#include <linux/device.h>
7#include <linux/firmware.h>
8#include <linux/module.h>
9#include <linux/errno.h>
10#include <linux/kernel.h>
11#include <linux/spi/spi.h>
12#include <linux/platform_device.h>
13#include <linux/delay.h>
14#include <asm/unaligned.h>
15
16#define FIRMWARE_NAME "lattice-ecp3.bit"
17
18
19
20
21
22#define ID_ECP3_17 0xc2088080
23#define ID_ECP3_35 0xc2048080
24
25
26#define FPGA_CMD_READ_ID 0x07
27#define FPGA_CMD_READ_STATUS 0x09
28#define FPGA_CMD_CLEAR 0x70
29#define FPGA_CMD_REFRESH 0x71
30#define FPGA_CMD_WRITE_EN 0x4a
31#define FPGA_CMD_WRITE_DIS 0x4f
32#define FPGA_CMD_WRITE_INC 0x41
33
34
35
36
37
38#define FPGA_STATUS_DONE 0x00004000
39#define FPGA_STATUS_CLEARED 0x00010000
40
41#define FPGA_CLEAR_TIMEOUT 5000
42#define FPGA_CLEAR_MSLEEP 10
43#define FPGA_CLEAR_LOOP_COUNT (FPGA_CLEAR_TIMEOUT / FPGA_CLEAR_MSLEEP)
44
45struct fpga_data {
46 struct completion fw_loaded;
47};
48
49struct ecp3_dev {
50 u32 jedec_id;
51 char *name;
52};
53
54static const struct ecp3_dev ecp3_dev[] = {
55 {
56 .jedec_id = ID_ECP3_17,
57 .name = "Lattice ECP3-17",
58 },
59 {
60 .jedec_id = ID_ECP3_35,
61 .name = "Lattice ECP3-35",
62 },
63};
64
65static void firmware_load(const struct firmware *fw, void *context)
66{
67 struct spi_device *spi = (struct spi_device *)context;
68 struct fpga_data *data = spi_get_drvdata(spi);
69 u8 *buffer;
70 u8 txbuf[8];
71 u8 rxbuf[8];
72 int rx_len = 8;
73 int i;
74 u32 jedec_id;
75 u32 status;
76
77 if (fw == NULL) {
78 dev_err(&spi->dev, "Cannot load firmware, aborting\n");
79 return;
80 }
81
82 if (fw->size == 0) {
83 dev_err(&spi->dev, "Error: Firmware size is 0!\n");
84 return;
85 }
86
87
88 txbuf[1] = 0x00;
89 txbuf[2] = 0x00;
90 txbuf[3] = 0x00;
91
92
93 txbuf[0] = FPGA_CMD_READ_ID;
94 spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
95 jedec_id = get_unaligned_be32(&rxbuf[4]);
96 dev_dbg(&spi->dev, "FPGA JTAG ID=%08x\n", jedec_id);
97
98 for (i = 0; i < ARRAY_SIZE(ecp3_dev); i++) {
99 if (jedec_id == ecp3_dev[i].jedec_id)
100 break;
101 }
102 if (i == ARRAY_SIZE(ecp3_dev)) {
103 dev_err(&spi->dev,
104 "Error: No supported FPGA detected (JEDEC_ID=%08x)!\n",
105 jedec_id);
106 return;
107 }
108
109 dev_info(&spi->dev, "FPGA %s detected\n", ecp3_dev[i].name);
110
111 txbuf[0] = FPGA_CMD_READ_STATUS;
112 spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
113 status = get_unaligned_be32(&rxbuf[4]);
114 dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);
115
116 buffer = kzalloc(fw->size + 8, GFP_KERNEL);
117 if (!buffer) {
118 dev_err(&spi->dev, "Error: Can't allocate memory!\n");
119 return;
120 }
121
122
123
124
125 buffer[0] = FPGA_CMD_WRITE_INC;
126 buffer[1] = 0xff;
127 buffer[2] = 0xff;
128 buffer[3] = 0xff;
129 memcpy(buffer + 4, fw->data, fw->size);
130
131 txbuf[0] = FPGA_CMD_REFRESH;
132 spi_write(spi, txbuf, 4);
133
134 txbuf[0] = FPGA_CMD_WRITE_EN;
135 spi_write(spi, txbuf, 4);
136
137 txbuf[0] = FPGA_CMD_CLEAR;
138 spi_write(spi, txbuf, 4);
139
140
141
142
143 for (i = 0; i < FPGA_CLEAR_LOOP_COUNT; i++) {
144 txbuf[0] = FPGA_CMD_READ_STATUS;
145 spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
146 status = get_unaligned_be32(&rxbuf[4]);
147 if (status == FPGA_STATUS_CLEARED)
148 break;
149
150 msleep(FPGA_CLEAR_MSLEEP);
151 }
152
153 if (i == FPGA_CLEAR_LOOP_COUNT) {
154 dev_err(&spi->dev,
155 "Error: Timeout waiting for FPGA to clear (status=%08x)!\n",
156 status);
157 kfree(buffer);
158 return;
159 }
160
161 dev_info(&spi->dev, "Configuring the FPGA...\n");
162 spi_write(spi, buffer, fw->size + 8);
163
164 txbuf[0] = FPGA_CMD_WRITE_DIS;
165 spi_write(spi, txbuf, 4);
166
167 txbuf[0] = FPGA_CMD_READ_STATUS;
168 spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
169 status = get_unaligned_be32(&rxbuf[4]);
170 dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);
171
172
173 if (status & FPGA_STATUS_DONE)
174 dev_info(&spi->dev, "FPGA successfully configured!\n");
175 else
176 dev_info(&spi->dev, "FPGA not configured (DONE not set)\n");
177
178
179
180
181 release_firmware(fw);
182
183 kfree(buffer);
184
185 complete(&data->fw_loaded);
186}
187
188static int lattice_ecp3_probe(struct spi_device *spi)
189{
190 struct fpga_data *data;
191 int err;
192
193 data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
194 if (!data) {
195 dev_err(&spi->dev, "Memory allocation for fpga_data failed\n");
196 return -ENOMEM;
197 }
198 spi_set_drvdata(spi, data);
199
200 init_completion(&data->fw_loaded);
201 err = request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT,
202 FIRMWARE_NAME, &spi->dev,
203 GFP_KERNEL, spi, firmware_load);
204 if (err) {
205 dev_err(&spi->dev, "Firmware loading failed with %d!\n", err);
206 return err;
207 }
208
209 dev_info(&spi->dev, "FPGA bitstream configuration driver registered\n");
210
211 return 0;
212}
213
214static int lattice_ecp3_remove(struct spi_device *spi)
215{
216 struct fpga_data *data = spi_get_drvdata(spi);
217
218 wait_for_completion(&data->fw_loaded);
219
220 return 0;
221}
222
223static const struct spi_device_id lattice_ecp3_id[] = {
224 { "ecp3-17", 0 },
225 { "ecp3-35", 0 },
226 { }
227};
228MODULE_DEVICE_TABLE(spi, lattice_ecp3_id);
229
230static struct spi_driver lattice_ecp3_driver = {
231 .driver = {
232 .name = "lattice-ecp3",
233 },
234 .probe = lattice_ecp3_probe,
235 .remove = lattice_ecp3_remove,
236 .id_table = lattice_ecp3_id,
237};
238
239module_spi_driver(lattice_ecp3_driver);
240
241MODULE_AUTHOR("Stefan Roese <sr@denx.de>");
242MODULE_DESCRIPTION("Lattice ECP3 FPGA configuration via SPI");
243MODULE_LICENSE("GPL");
244MODULE_FIRMWARE(FIRMWARE_NAME);
245
