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1 // SPDX-License-Identifier: BSD-3-Clause
2 /*
3  * Copyright (C) 2012 Altera Corporation <www.altera.com>
4  * All rights reserved.
5  *
6  * This file contains only support functions used also by the SoCFPGA
7  * platform code, the real meat is located in drivers/fpga/socfpga.c .
8  */
9 
10 #include <common.h>
11 #include <asm/io.h>
12 #include <linux/errno.h>
13 #include <asm/arch/fpga_manager.h>
14 #include <asm/arch/reset_manager.h>
15 #include <asm/arch/system_manager.h>
16 
17 /* Timeout count */
18 #define FPGA_TIMEOUT_CNT		0x1000000
19 
20 static struct socfpga_fpga_manager *fpgamgr_regs =
21 	(struct socfpga_fpga_manager *)SOCFPGA_FPGAMGRREGS_ADDRESS;
22 
23 /* Check whether FPGA Init_Done signal is high */
is_fpgamgr_initdone_high(void)24 static int is_fpgamgr_initdone_high(void)
25 {
26 	unsigned long val;
27 
28 	val = readl(&fpgamgr_regs->gpio_ext_porta);
29 	return val & FPGAMGRREGS_MON_GPIO_EXT_PORTA_ID_MASK;
30 }
31 
32 /* Get the FPGA mode */
fpgamgr_get_mode(void)33 int fpgamgr_get_mode(void)
34 {
35 	unsigned long val;
36 
37 	val = readl(&fpgamgr_regs->stat);
38 	return val & FPGAMGRREGS_STAT_MODE_MASK;
39 }
40 
41 /* Check whether FPGA is ready to be accessed */
fpgamgr_test_fpga_ready(void)42 int fpgamgr_test_fpga_ready(void)
43 {
44 	/* Check for init done signal */
45 	if (!is_fpgamgr_initdone_high())
46 		return 0;
47 
48 	/* Check again to avoid false glitches */
49 	if (!is_fpgamgr_initdone_high())
50 		return 0;
51 
52 	if (fpgamgr_get_mode() != FPGAMGRREGS_MODE_USERMODE)
53 		return 0;
54 
55 	return 1;
56 }
57 
58 /* Poll until FPGA is ready to be accessed or timeout occurred */
fpgamgr_poll_fpga_ready(void)59 int fpgamgr_poll_fpga_ready(void)
60 {
61 	unsigned long i;
62 
63 	/* If FPGA is blank, wait till WD invoke warm reset */
64 	for (i = 0; i < FPGA_TIMEOUT_CNT; i++) {
65 		/* check for init done signal */
66 		if (!is_fpgamgr_initdone_high())
67 			continue;
68 		/* check again to avoid false glitches */
69 		if (!is_fpgamgr_initdone_high())
70 			continue;
71 		return 1;
72 	}
73 
74 	return 0;
75 }
76