1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2013  Renesas Solutions Corp.
4  */
5 
6 #include <common.h>
7 
8 #define CONFIG_SPI_ADDR		0x00000000
9 #define PHYADDR(_addr)		((_addr & 0x1fffffff) | 0x40000000)
10 #define CONFIG_RAM_BOOT_PHYS	PHYADDR(CONFIG_SYS_TEXT_BASE)
11 
12 #define SPIWDMADR	0xFE001018
13 #define SPIWDMCNTR	0xFE001020
14 #define SPIDMCOR	0xFE001028
15 #define SPIDMINTSR	0xFE001188
16 #define SPIDMINTMR	0xFE001190
17 
18 #define SPIDMINTSR_DMEND	0x00000004
19 
20 #define TBR	0xFE002000
21 #define RBR	0xFE002000
22 
23 #define CR1	0xFE002008
24 #define CR2	0xFE002010
25 #define CR3	0xFE002018
26 #define CR4	0xFE002020
27 #define CR7	0xFE002038
28 #define CR8	0xFE002040
29 
30 /* CR1 */
31 #define SPI_TBE		0x80
32 #define SPI_TBF		0x40
33 #define SPI_RBE		0x20
34 #define SPI_RBF		0x10
35 #define SPI_PFONRD	0x08
36 #define SPI_SSDB	0x04
37 #define SPI_SSD		0x02
38 #define SPI_SSA		0x01
39 
40 /* CR2 */
41 #define SPI_RSTF	0x80
42 #define SPI_LOOPBK	0x40
43 #define SPI_CPOL	0x20
44 #define SPI_CPHA	0x10
45 #define SPI_L1M0	0x08
46 
47 /* CR4 */
48 #define SPI_TBEI	0x80
49 #define SPI_TBFI	0x40
50 #define SPI_RBEI	0x20
51 #define SPI_RBFI	0x10
52 #define SPI_SpiS0	0x02
53 #define SPI_SSS		0x01
54 
55 /* CR7 */
56 #define CR7_IDX_OR12	0x12
57 #define OR12_ADDR32	0x00000001
58 
59 #define spi_write(val, addr)	(*(volatile unsigned long *)(addr)) = val
60 #define spi_read(addr)		(*(volatile unsigned long *)(addr))
61 
62 /* M25P80 */
63 #define M25_READ	0x03
64 #define M25_READ_4BYTE	0x13
65 
66 extern void bss_start(void);
67 
68 #define __uses_spiboot2	__attribute__((section(".spiboot2.text")))
69 static void __uses_spiboot2 spi_reset(void)
70 {
71 	int timeout = 0x00100000;
72 
73 	/* Make sure the last transaction is finalized */
74 	spi_write(0x00, CR3);
75 	spi_write(0x02, CR1);
76 	while (!(spi_read(CR4) & SPI_SpiS0)) {
77 		if (timeout-- < 0)
78 			break;
79 	}
80 	spi_write(0x00, CR1);
81 
82 	spi_write(spi_read(CR2) | SPI_RSTF, CR2);	/* fifo reset */
83 	spi_write(spi_read(CR2) & ~SPI_RSTF, CR2);
84 
85 	spi_write(0, SPIDMCOR);
86 }
87 
88 static void __uses_spiboot2 spi_read_flash(void *buf, unsigned long addr,
89 					   unsigned long len)
90 {
91 	spi_write(CR7_IDX_OR12, CR7);
92 	if (spi_read(CR8) & OR12_ADDR32) {
93 		/* 4-bytes address mode */
94 		spi_write(M25_READ_4BYTE, TBR);
95 		spi_write((addr >> 24) & 0xFF, TBR);	/* ADDR31-24 */
96 	} else {
97 		/* 3-bytes address mode */
98 		spi_write(M25_READ, TBR);
99 	}
100 	spi_write((addr >> 16) & 0xFF, TBR);	/* ADDR23-16 */
101 	spi_write((addr >> 8) & 0xFF, TBR);	/* ADDR15-8 */
102 	spi_write(addr & 0xFF, TBR);		/* ADDR7-0 */
103 
104 	spi_write(SPIDMINTSR_DMEND, SPIDMINTSR);
105 	spi_write((unsigned long)buf, SPIWDMADR);
106 	spi_write(len & 0xFFFFFFE0, SPIWDMCNTR);
107 	spi_write(1, SPIDMCOR);
108 
109 	spi_write(0xff, CR3);
110 	spi_write(spi_read(CR1) | SPI_SSDB, CR1);
111 	spi_write(spi_read(CR1) | SPI_SSA, CR1);
112 
113 	while (!(spi_read(SPIDMINTSR) & SPIDMINTSR_DMEND))
114 		;
115 
116 	/* Nagate SP0-SS0 */
117 	spi_write(0, CR1);
118 }
119 
120 void __uses_spiboot2 spiboot_main(void)
121 {
122 	/*
123 	 * This code rounds len up for SPIWDMCNTR. We should set it to 0 in
124 	 * lower 5-bits.
125 	 */
126 	void (*_start)(void) = (void *)CONFIG_SYS_TEXT_BASE;
127 	volatile unsigned long len = (bss_start - _start + 31) & 0xffffffe0;
128 
129 	spi_reset();
130 	spi_read_flash((void *)CONFIG_RAM_BOOT_PHYS, CONFIG_SPI_ADDR, len);
131 
132 	_start();
133 }
134