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Marek Vasut54cd51b2011-10-31 14:14:15 +01001/*
2 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
3 *
4 * Based on code:
5 * Copyright (C) 2005-2009 Samsung Electronics
6 * Kyungmin Park <kyungmin.park@samsung.com>
7 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02008 * SPDX-License-Identifier: GPL-2.0+
Marek Vasut54cd51b2011-10-31 14:14:15 +01009 */
10
11#include <common.h>
12#include <asm/io.h>
13#include <linux/mtd/onenand_regs.h>
14#include <onenand_uboot.h>
15
16/*
17 * Device geometry:
18 * - 2048b page, 128k erase block.
19 * - 4096b page, 256k erase block.
20 */
21enum onenand_spl_pagesize {
22 PAGE_2K = 2048,
23 PAGE_4K = 4096,
24};
25
26#define ONENAND_PAGES_PER_BLOCK 64
27#define onenand_block_address(block) (block)
28#define onenand_sector_address(page) (page << 2)
29#define onenand_buffer_address() ((1 << 3) << 8)
30#define onenand_bufferram_address(block) (0)
31
32static inline uint16_t onenand_readw(uint32_t addr)
33{
34 return readw(CONFIG_SYS_ONENAND_BASE + addr);
35}
36
37static inline void onenand_writew(uint16_t value, uint32_t addr)
38{
39 writew(value, CONFIG_SYS_ONENAND_BASE + addr);
40}
41
42static enum onenand_spl_pagesize onenand_spl_get_geometry(void)
43{
44 uint32_t dev_id, density;
45
46 if (!onenand_readw(ONENAND_REG_TECHNOLOGY)) {
47 dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
48 density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
49 density &= ONENAND_DEVICE_DENSITY_MASK;
50
51 if (density < ONENAND_DEVICE_DENSITY_4Gb)
52 return PAGE_2K;
53
54 if (dev_id & ONENAND_DEVICE_IS_DDP)
55 return PAGE_2K;
56 }
57
58 return PAGE_4K;
59}
60
61static int onenand_spl_read_page(uint32_t block, uint32_t page, uint32_t *buf,
62 enum onenand_spl_pagesize pagesize)
63{
64 const uint32_t addr = CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM;
65 uint32_t offset;
66
67 onenand_writew(onenand_block_address(block),
68 ONENAND_REG_START_ADDRESS1);
69
70 onenand_writew(onenand_bufferram_address(block),
71 ONENAND_REG_START_ADDRESS2);
72
73 onenand_writew(onenand_sector_address(page),
74 ONENAND_REG_START_ADDRESS8);
75
76 onenand_writew(onenand_buffer_address(),
77 ONENAND_REG_START_BUFFER);
78
79 onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);
80
81 onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);
82
83 while (!(onenand_readw(ONENAND_REG_INTERRUPT) & ONENAND_INT_READ))
84 continue;
85
86 /* Check for invalid block mark */
87 if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
88 return 1;
89
90 for (offset = 0; offset < pagesize; offset += 4)
91 buf[offset / 4] = readl(addr + offset);
92
93 return 0;
94}
95
96void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst)
97{
98 uint32_t *addr = (uint32_t *)dst;
Enric Balletbo i Serraf9961372013-02-07 23:14:47 +000099 uint32_t to_page;
Marek Vasut54cd51b2011-10-31 14:14:15 +0100100 uint32_t block;
101 uint32_t page, rpage;
102 enum onenand_spl_pagesize pagesize;
103 int ret;
104
105 pagesize = onenand_spl_get_geometry();
106
107 /*
108 * The page can be either 2k or 4k, avoid using DIV_ROUND_UP to avoid
109 * pulling further unwanted functions into the SPL.
110 */
111 if (pagesize == 2048) {
Marek Vasut54cd51b2011-10-31 14:14:15 +0100112 page = offs / 2048;
Enric Balletbo i Serraf9961372013-02-07 23:14:47 +0000113 to_page = page + DIV_ROUND_UP(size, 2048);
Marek Vasut54cd51b2011-10-31 14:14:15 +0100114 } else {
Marek Vasut54cd51b2011-10-31 14:14:15 +0100115 page = offs / 4096;
Enric Balletbo i Serraf9961372013-02-07 23:14:47 +0000116 to_page = page + DIV_ROUND_UP(size, 4096);
Marek Vasut54cd51b2011-10-31 14:14:15 +0100117 }
118
Enric Balletbo i Serraf9961372013-02-07 23:14:47 +0000119 for (; page <= to_page; page++) {
Marek Vasut54cd51b2011-10-31 14:14:15 +0100120 block = page / ONENAND_PAGES_PER_BLOCK;
121 rpage = page & (ONENAND_PAGES_PER_BLOCK - 1);
122 ret = onenand_spl_read_page(block, rpage, addr, pagesize);
Enric Balletbo i Serraf9961372013-02-07 23:14:47 +0000123 if (ret)
Marek Vasut54cd51b2011-10-31 14:14:15 +0100124 page += ONENAND_PAGES_PER_BLOCK - 1;
Enric Balletbo i Serraf9961372013-02-07 23:14:47 +0000125 else
Marek Vasut54cd51b2011-10-31 14:14:15 +0100126 addr += pagesize / 4;
Marek Vasut54cd51b2011-10-31 14:14:15 +0100127 }
128}