mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
199 lines
4.8 KiB
C
199 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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*
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* Based on code:
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* Copyright (C) 2005-2009 Samsung Electronics
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* Kyungmin Park <kyungmin.park@samsung.com>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <linux/mtd/onenand_regs.h>
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#include <onenand_uboot.h>
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/*
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* Device geometry:
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* - 2048b page, 128k erase block.
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* - 4096b page, 256k erase block.
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*/
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enum onenand_spl_pagesize {
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PAGE_2K = 2048,
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PAGE_4K = 4096,
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};
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static unsigned int density_mask;
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#define ONENAND_PAGES_PER_BLOCK 64
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#define onenand_sector_address(page) (page << 2)
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#define onenand_buffer_address() ((1 << 3) << 8)
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static inline int onenand_block_address(int block)
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{
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/* Device Flash Core select, NAND Flash Block Address */
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if (block & density_mask)
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return ONENAND_DDP_CHIP1 | (block ^ density_mask);
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return block;
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}
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static inline int onenand_bufferram_address(int block)
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{
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/* Device BufferRAM Select */
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if (block & density_mask)
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return ONENAND_DDP_CHIP1;
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return ONENAND_DDP_CHIP0;
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}
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static inline uint16_t onenand_readw(uint32_t addr)
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{
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return readw(CONFIG_SYS_ONENAND_BASE + addr);
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}
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static inline void onenand_writew(uint16_t value, uint32_t addr)
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{
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writew(value, CONFIG_SYS_ONENAND_BASE + addr);
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}
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static enum onenand_spl_pagesize onenand_spl_get_geometry(void)
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{
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unsigned int dev_id, density, size;
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if (!onenand_readw(ONENAND_REG_TECHNOLOGY)) {
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dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
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density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
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density &= ONENAND_DEVICE_DENSITY_MASK;
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if (density < ONENAND_DEVICE_DENSITY_4Gb)
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return PAGE_2K;
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if (dev_id & ONENAND_DEVICE_IS_DDP) {
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size = onenand_readw(ONENAND_REG_DATA_BUFFER_SIZE);
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density_mask = 1 << (18 + density - ffs(size));
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return PAGE_2K;
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}
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}
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return PAGE_4K;
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}
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static int onenand_spl_read_page(uint32_t block, uint32_t page, uint32_t *buf,
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enum onenand_spl_pagesize pagesize)
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{
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const uint32_t addr = CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM;
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uint32_t offset;
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onenand_writew(onenand_block_address(block),
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ONENAND_REG_START_ADDRESS1);
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onenand_writew(onenand_bufferram_address(block),
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ONENAND_REG_START_ADDRESS2);
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onenand_writew(onenand_sector_address(page),
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ONENAND_REG_START_ADDRESS8);
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onenand_writew(onenand_buffer_address(),
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ONENAND_REG_START_BUFFER);
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onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);
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onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);
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while (!(onenand_readw(ONENAND_REG_INTERRUPT) & ONENAND_INT_READ))
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continue;
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/* Check for invalid block mark */
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if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
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return 1;
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for (offset = 0; offset < pagesize; offset += 4)
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buf[offset / 4] = readl(addr + offset);
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return 0;
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}
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#ifdef CONFIG_SPL_UBI
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/* Temporary storage for non page aligned and non page sized reads. */
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static u8 scratch_buf[PAGE_4K];
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/**
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* onenand_spl_read_block - Read data from physical eraseblock into a buffer
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* @block: Number of the physical eraseblock
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* @offset: Data offset from the start of @peb
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* @len: Data size to read
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* @dst: Address of the destination buffer
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*
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* Notes:
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* @offset + @len are not allowed to be larger than a physical
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* erase block. No sanity check done for simplicity reasons.
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*/
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int onenand_spl_read_block(int block, int offset, int len, void *dst)
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{
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int page, read;
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static int psize;
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if (!psize)
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psize = onenand_spl_get_geometry();
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/* Calculate the page number */
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page = offset / psize;
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/* Offset to the start of a flash page */
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offset = offset % psize;
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while (len) {
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/*
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* Non page aligned reads go to the scratch buffer.
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* Page aligned reads go directly to the destination.
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*/
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if (offset || len < psize) {
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onenand_spl_read_page(block, page,
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(uint32_t *)scratch_buf, psize);
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read = min(len, psize - offset);
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memcpy(dst, scratch_buf + offset, read);
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offset = 0;
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} else {
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onenand_spl_read_page(block, page, dst, psize);
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read = psize;
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}
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page++;
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len -= read;
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dst += read;
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}
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return 0;
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}
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#endif
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void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst)
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{
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uint32_t *addr = (uint32_t *)dst;
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uint32_t to_page;
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uint32_t block;
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uint32_t page, rpage;
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enum onenand_spl_pagesize pagesize;
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int ret;
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pagesize = onenand_spl_get_geometry();
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/*
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* The page can be either 2k or 4k, avoid using DIV_ROUND_UP to avoid
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* pulling further unwanted functions into the SPL.
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*/
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if (pagesize == 2048) {
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page = offs / 2048;
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to_page = page + DIV_ROUND_UP(size, 2048);
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} else {
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page = offs / 4096;
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to_page = page + DIV_ROUND_UP(size, 4096);
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}
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for (; page <= to_page; page++) {
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block = page / ONENAND_PAGES_PER_BLOCK;
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rpage = page & (ONENAND_PAGES_PER_BLOCK - 1);
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ret = onenand_spl_read_page(block, rpage, addr, pagesize);
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if (ret)
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page += ONENAND_PAGES_PER_BLOCK - 1;
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else
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addr += pagesize / 4;
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}
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}
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