1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
4 */
5
6 #include <common.h>
7 #include <altera.h>
8 #include <errno.h>
9 #include <log.h>
10 #include <asm/gpio.h>
11 #include <asm/io.h>
12 #include <asm/arch/cpu.h>
13 #include <asm/arch/soc.h>
14 #include <asm/arch-mvebu/spi.h>
15 #include "theadorable.h"
16
17 /*
18 * FPGA programming support
19 */
fpga_pre_fn(int cookie)20 static int fpga_pre_fn(int cookie)
21 {
22 int gpio_config = COOKIE2CONFIG(cookie);
23 int gpio_done = COOKIE2DONE(cookie);
24 int ret;
25
26 debug("%s (%d): cookie=%08x gpio_config=%d gpio_done=%d\n",
27 __func__, __LINE__, cookie, gpio_config, gpio_done);
28
29 /* Configure config pin */
30 /* Set to output */
31 ret = gpio_request(gpio_config, "CONFIG");
32 if (ret < 0)
33 return ret;
34 gpio_direction_output(gpio_config, 1);
35
36 /* Configure done pin */
37 /* Set to input */
38 ret = gpio_request(gpio_done, "DONE");
39 if (ret < 0)
40 return ret;
41
42 gpio_direction_input(gpio_done);
43
44 return 0;
45 }
46
fpga_config_fn(int assert,int flush,int cookie)47 static int fpga_config_fn(int assert, int flush, int cookie)
48 {
49 int gpio_config = COOKIE2CONFIG(cookie);
50
51 debug("%s (%d): cookie=%08x gpio_config=%d\n",
52 __func__, __LINE__, cookie, gpio_config);
53
54 if (assert)
55 gpio_set_value(gpio_config, 1);
56 else
57 gpio_set_value(gpio_config, 0);
58
59 return 0;
60 }
61
fpga_write_fn(const void * buf,size_t len,int flush,int cookie)62 static int fpga_write_fn(const void *buf, size_t len, int flush, int cookie)
63 {
64 int spi_bus = COOKIE2SPI_BUS(cookie);
65 int spi_dev = COOKIE2SPI_DEV(cookie);
66 struct kwspi_registers *reg;
67 u32 control_reg;
68 u32 config_reg;
69 void *dst;
70
71 /*
72 * Write data to FPGA attached to SPI bus via SPI direct write.
73 * This results in the fastest and easiest way to program the
74 * bitstream into the FPGA.
75 */
76 debug("%s (%d): cookie=%08x spi_bus=%d spi_dev=%d\n",
77 __func__, __LINE__, cookie, spi_bus, spi_dev);
78
79 if (spi_bus == 0) {
80 reg = (struct kwspi_registers *)MVEBU_REGISTER(0x10600);
81 dst = (void *)SPI_BUS0_DEV1_BASE;
82 } else {
83 reg = (struct kwspi_registers *)MVEBU_REGISTER(0x10680);
84 dst = (void *)SPI_BUS1_DEV2_BASE;
85 }
86
87 /* Configure SPI controller for direct access mode */
88 control_reg = readl(®->ctrl);
89 config_reg = readl(®->cfg);
90 writel(0x00000214, ®->cfg); /* 27MHz clock */
91 writel(0x00000000, ®->dw_cfg); /* don't de-asset CS */
92 writel(KWSPI_CSN_ACT, ®->ctrl); /* activate CS */
93
94 /* Copy data to the SPI direct mapped window */
95 memcpy(dst, buf, len);
96
97 /* Restore original register values */
98 writel(control_reg, ®->ctrl);
99 writel(config_reg, ®->cfg);
100
101 return 0;
102 }
103
104 /* Returns the state of CONF_DONE Pin */
fpga_done_fn(int cookie)105 static int fpga_done_fn(int cookie)
106 {
107 int gpio_done = COOKIE2DONE(cookie);
108 unsigned long ts;
109
110 debug("%s (%d): cookie=%08x gpio_done=%d\n",
111 __func__, __LINE__, cookie, gpio_done);
112
113 ts = get_timer(0);
114 do {
115 if (gpio_get_value(gpio_done))
116 return 0;
117 } while (get_timer(ts) < 1000);
118
119 /* timeout so return error */
120 return -ENODEV;
121 }
122
123 static altera_board_specific_func stratixv_fns = {
124 .pre = fpga_pre_fn,
125 .config = fpga_config_fn,
126 .write = fpga_write_fn,
127 .done = fpga_done_fn,
128 };
129
130 static Altera_desc altera_fpga[] = {
131 {
132 /* Family */
133 Altera_StratixV,
134 /* Interface type */
135 passive_serial,
136 /* No limitation as additional data will be ignored */
137 -1,
138 /* Device function table */
139 (void *)&stratixv_fns,
140 /* Base interface address specified in driver */
141 NULL,
142 /* Cookie implementation */
143 /*
144 * In this 32bit word the following information is coded:
145 * Bit 31 ... Bit 0
146 * SPI-Bus | SPI-Dev | Config-Pin | Done-Pin
147 */
148 FPGA_COOKIE(0, 1, 26, 7)
149 },
150 {
151 /* Family */
152 Altera_StratixV,
153 /* Interface type */
154 passive_serial,
155 /* No limitation as additional data will be ignored */
156 -1,
157 /* Device function table */
158 (void *)&stratixv_fns,
159 /* Base interface address specified in driver */
160 NULL,
161 /* Cookie implementation */
162 /*
163 * In this 32bit word the following information is coded:
164 * Bit 31 ... Bit 0
165 * SPI-Bus | SPI-Dev | Config-Pin | Done-Pin
166 */
167 FPGA_COOKIE(1, 2, 29, 9)
168 },
169 };
170
171 /* Add device descriptor to FPGA device table */
board_fpga_add(void)172 void board_fpga_add(void)
173 {
174 int i;
175
176 fpga_init();
177 for (i = 0; i < ARRAY_SIZE(altera_fpga); i++)
178 fpga_add(fpga_altera, &altera_fpga[i]);
179 }
180