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https://github.com/AsahiLinux/u-boot
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spl: nand: sunxi: use PIO instead of DMA
SPL support was first written to support only the earlier generations of Allwinner SoCs, and was only really enabled on the A13 / GR8. However, those old SoCs had a DMA engine that has been replaced since the A31 by another DMA controller that is no longer compatible. Since the code directly uses that DMA controller, it cannot operate properly on the later SoCs, while the NAND controller has not changed. There's two paths forward, the first one would have been to add support for that DMA controller too, the second to just remove the DMA usage entirely and rely on PIO. The later has been chosen because CPU overload at this stage is not an issue and it makes the driver more generic, and easier to understand. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
This commit is contained in:
Miquel Raynal
Maxime Ripard
parent
7440bd7885
commit
6ddbb1e936
1 changed files with 53 additions and 78 deletions
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@ -10,6 +10,7 @@
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#include <common.h>
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#include <config.h>
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#include <nand.h>
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#include <linux/ctype.h>
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/* registers */
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#define NFC_CTL 0x00000000
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@ -67,10 +68,12 @@
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#define NFC_SEND_CMD3 (1 << 28)
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#define NFC_SEND_CMD4 (1 << 29)
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#define NFC_RAW_CMD (0 << 30)
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#define NFC_ECC_CMD (1 << 30)
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#define NFC_PAGE_CMD (2 << 30)
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#define NFC_ST_CMD_INT_FLAG (1 << 1)
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#define NFC_ST_DMA_INT_FLAG (1 << 2)
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#define NFC_ST_CMD_FIFO_STAT (1 << 3)
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#define NFC_READ_CMD_OFFSET 0
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#define NFC_RANDOM_READ_CMD0_OFFSET 8
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@ -80,22 +83,6 @@
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#define NFC_CMD_RNDOUT 0x05
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#define NFC_CMD_READSTART 0x30
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#define SUNXI_DMA_CFG_REG0 0x300
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#define SUNXI_DMA_SRC_START_ADDR_REG0 0x304
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#define SUNXI_DMA_DEST_START_ADDRR_REG0 0x308
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#define SUNXI_DMA_DDMA_BC_REG0 0x30C
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#define SUNXI_DMA_DDMA_PARA_REG0 0x318
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#define SUNXI_DMA_DDMA_CFG_REG_LOADING (1 << 31)
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#define SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32 (2 << 25)
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#define SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM (1 << 16)
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#define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32 (2 << 9)
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#define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO (1 << 5)
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#define SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC (3 << 0)
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#define SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC (0x0F << 0)
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#define SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE (0x7F << 8)
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struct nfc_config {
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int page_size;
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int ecc_strength;
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@ -268,86 +255,74 @@ static const int ecc_bytes[] = {32, 46, 54, 60, 74, 88, 102, 110, 116};
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static int nand_read_page(const struct nfc_config *conf, u32 offs,
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void *dest, int len)
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{
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dma_addr_t dst = (dma_addr_t)dest;
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int nsectors = len / conf->ecc_size;
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u16 rand_seed = 0;
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u32 val;
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int page;
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page = offs / conf->page_size;
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int oob_chunk_sz = ecc_bytes[conf->ecc_strength];
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int page = offs / conf->page_size;
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u32 ecc_st;
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int i;
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if (offs % conf->page_size || len % conf->ecc_size ||
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len > conf->page_size || len < 0)
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return -EINVAL;
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/* clear ecc status */
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writel(0, SUNXI_NFC_BASE + NFC_ECC_ST);
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/* Choose correct seed if randomized */
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if (conf->randomize)
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rand_seed = random_seed[page % conf->nseeds];
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writel((rand_seed << 16) | (conf->ecc_strength << 12) |
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(conf->randomize ? NFC_ECC_RANDOM_EN : 0) |
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(conf->ecc_size == 512 ? NFC_ECC_BLOCK_SIZE : 0) |
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NFC_ECC_EN | NFC_ECC_PIPELINE | NFC_ECC_EXCEPTION,
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SUNXI_NFC_BASE + NFC_ECC_CTL);
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/* Retrieve data from SRAM (PIO) */
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for (i = 0; i < nsectors; i++) {
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int data_off = i * conf->ecc_size;
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int oob_off = conf->page_size + (i * oob_chunk_sz);
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u8 *data = dest + data_off;
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flush_dcache_range(dst, ALIGN(dst + conf->ecc_size, ARCH_DMA_MINALIGN));
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/* Clear ECC status and restart ECC engine */
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writel(0, SUNXI_NFC_BASE + NFC_ECC_ST);
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writel((rand_seed << 16) | (conf->ecc_strength << 12) |
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(conf->randomize ? NFC_ECC_RANDOM_EN : 0) |
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(conf->ecc_size == 512 ? NFC_ECC_BLOCK_SIZE : 0) |
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NFC_ECC_EN | NFC_ECC_EXCEPTION,
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SUNXI_NFC_BASE + NFC_ECC_CTL);
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/* SUNXI_DMA */
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writel(0x0, SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0); /* clr dma cmd */
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/* read from REG_IO_DATA */
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writel(SUNXI_NFC_BASE + NFC_IO_DATA,
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SUNXI_DMA_BASE + SUNXI_DMA_SRC_START_ADDR_REG0);
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/* read to RAM */
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writel(dst, SUNXI_DMA_BASE + SUNXI_DMA_DEST_START_ADDRR_REG0);
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writel(SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC |
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SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE,
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SUNXI_DMA_BASE + SUNXI_DMA_DDMA_PARA_REG0);
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writel(len, SUNXI_DMA_BASE + SUNXI_DMA_DDMA_BC_REG0);
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writel(SUNXI_DMA_DDMA_CFG_REG_LOADING |
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SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32 |
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SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM |
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SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32 |
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SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO |
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SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC,
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SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0);
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/* Move the data in SRAM */
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nand_change_column(data_off);
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writel(conf->ecc_size, SUNXI_NFC_BASE + NFC_CNT);
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nand_exec_cmd(NFC_DATA_TRANS);
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writel(nsectors, SUNXI_NFC_BASE + NFC_SECTOR_NUM);
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writel(NFC_ST_DMA_INT_FLAG, SUNXI_NFC_BASE + NFC_ST);
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writel(NFC_DATA_TRANS | NFC_PAGE_CMD | NFC_DATA_SWAP_METHOD,
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SUNXI_NFC_BASE + NFC_CMD);
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/*
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* Let the ECC engine consume the ECC bytes and possibly correct
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* the data.
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*/
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nand_change_column(oob_off);
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nand_exec_cmd(NFC_DATA_TRANS | NFC_ECC_CMD);
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if (!check_value(SUNXI_NFC_BASE + NFC_ST, NFC_ST_DMA_INT_FLAG,
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DEFAULT_TIMEOUT_US)) {
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printf("Error while initializing dma interrupt\n");
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return -EIO;
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}
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writel(NFC_ST_DMA_INT_FLAG, SUNXI_NFC_BASE + NFC_ST);
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/* Get the ECC status */
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ecc_st = readl(SUNXI_NFC_BASE + NFC_ECC_ST);
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if (!check_value_negated(SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0,
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SUNXI_DMA_DDMA_CFG_REG_LOADING,
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DEFAULT_TIMEOUT_US)) {
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printf("Error while waiting for dma transfer to finish\n");
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return -EIO;
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/* ECC error detected. */
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if (ecc_st & 0xffff)
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return -EIO;
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/*
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* Return 1 if the first chunk is empty (needed for
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* configuration detection).
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*/
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if (!i && (ecc_st & 0x10000))
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return 1;
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/* Retrieve the data from SRAM */
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memcpy_fromio(data, SUNXI_NFC_BASE + NFC_RAM0_BASE,
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conf->ecc_size);
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/* Stop the ECC engine */
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writel(readl(SUNXI_NFC_BASE + NFC_ECC_CTL) & ~NFC_ECC_EN,
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SUNXI_NFC_BASE + NFC_ECC_CTL);
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if (data_off + conf->ecc_size >= len)
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break;
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}
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invalidate_dcache_range(dst,
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ALIGN(dst + conf->ecc_size, ARCH_DMA_MINALIGN));
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val = readl(SUNXI_NFC_BASE + NFC_ECC_ST);
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/* ECC error detected. */
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if (val & 0xffff)
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return -EIO;
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/*
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* Return 1 if the page is empty.
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* We consider the page as empty if the first ECC block is marked
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* empty.
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*/
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return (val & 0x10000) ? 1 : 0;
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return 0;
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}
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static int nand_max_ecc_strength(struct nfc_config *conf)
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