drivers/mtd/onenand/onenand_spl.c

   1 /*
   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  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  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  */
  21 enum 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
  32 static inline uint16_t onenand_readw(uint32_t addr)
  33 {
  34         return readw(CONFIG_SYS_ONENAND_BASE + addr);
  35 }
  36
  37 static inline void onenand_writew(uint16_t value, uint32_t addr)
  38 {
  39         writew(value, CONFIG_SYS_ONENAND_BASE + addr);
  40 }
  41
  42 static 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
  61 static 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
  96 void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst)
  97 {
  98         uint32_t *addr = (uint32_t *)dst;
  99         uint32_t to_page;
 100         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) {
 112                 page = offs / 2048;
 113                 to_page = page + DIV_ROUND_UP(size, 2048);
 114         } else {
 115                 page = offs / 4096;
 116                 to_page = page + DIV_ROUND_UP(size, 4096);
 117         }
 118
 119         for (; page <= to_page; page++) {
 120                 block = page / ONENAND_PAGES_PER_BLOCK;
 121                 rpage = page & (ONENAND_PAGES_PER_BLOCK - 1);
 122                 ret = onenand_spl_read_page(block, rpage, addr, pagesize);
 123                 if (ret)
 124                         page += ONENAND_PAGES_PER_BLOCK - 1;
 125                 else
 126                         addr += pagesize / 4;
 127         }
 128 }