xref: /openbmc/u-boot/drivers/fpga/socfpga.c (revision 0a333602)
1 /*
2  * Copyright (C) 2012 Altera Corporation <www.altera.com>
3  * All rights reserved.
4  *
5  * SPDX-License-Identifier:	BSD-3-Clause
6  */
7 
8 #include <common.h>
9 #include <asm/io.h>
10 #include <linux/errno.h>
11 #include <asm/arch/fpga_manager.h>
12 #include <asm/arch/reset_manager.h>
13 #include <asm/arch/system_manager.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
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 int fpgamgr_dclkcnt_set(unsigned long cnt)
24 {
25 	unsigned long i;
26 
27 	/* Clear any existing done status */
28 	if (readl(&fpgamgr_regs->dclkstat))
29 		writel(0x1, &fpgamgr_regs->dclkstat);
30 
31 	/* Write the dclkcnt */
32 	writel(cnt, &fpgamgr_regs->dclkcnt);
33 
34 	/* Wait till the dclkcnt done */
35 	for (i = 0; i < FPGA_TIMEOUT_CNT; i++) {
36 		if (!readl(&fpgamgr_regs->dclkstat))
37 			continue;
38 
39 		writel(0x1, &fpgamgr_regs->dclkstat);
40 		return 0;
41 	}
42 
43 	return -ETIMEDOUT;
44 }
45 
46 /* Write the RBF data to FPGA Manager */
47 void fpgamgr_program_write(const void *rbf_data, size_t rbf_size)
48 {
49 	uint32_t src = (uint32_t)rbf_data;
50 	uint32_t dst = SOCFPGA_FPGAMGRDATA_ADDRESS;
51 
52 	/* Number of loops for 32-byte long copying. */
53 	uint32_t loops32 = rbf_size / 32;
54 	/* Number of loops for 4-byte long copying + trailing bytes */
55 	uint32_t loops4 = DIV_ROUND_UP(rbf_size % 32, 4);
56 
57 	asm volatile(
58 		"1:	ldmia	%0!,	{r0-r7}\n"
59 		"	stmia	%1!,	{r0-r7}\n"
60 		"	sub	%1,	#32\n"
61 		"	subs	%2,	#1\n"
62 		"	bne	1b\n"
63 		"	cmp	%3,	#0\n"
64 		"	beq	3f\n"
65 		"2:	ldr	%2,	[%0],	#4\n"
66 		"	str	%2,	[%1]\n"
67 		"	subs	%3,	#1\n"
68 		"	bne	2b\n"
69 		"3:	nop\n"
70 		: "+r"(src), "+r"(dst), "+r"(loops32), "+r"(loops4) :
71 		: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "cc");
72 }
73 
74