[U-Boot] [PATCH 02/15] sunxi_nand_spl: Drop unnecessary temp buf
Chen-Yu Tsai
wens at csie.org
Mon Aug 17 09:22:56 CEST 2015
On Sun, Aug 16, 2015 at 4:02 AM, Hans de Goede <hdegoede at redhat.com> wrote:
> nand_spl_load_image() always gets called with either CONFIG_SYS_TEXT_BASE
> or spl_image.load_addr as destination, both of which are properly aligened,
> and have plenty of space for "overshooting" up to
> CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE bytes, as we read in
> CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE bytes chunks.
>
> This saves CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE (typically 1k) in
> SPL size, which is a lot on the total 24k we have.
>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> ---
> drivers/mtd/nand/sunxi_nand_spl.c | 35 ++++++++---------------------------
> 1 file changed, 8 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/mtd/nand/sunxi_nand_spl.c b/drivers/mtd/nand/sunxi_nand_spl.c
> index ac5f56d..46654e4 100644
> --- a/drivers/mtd/nand/sunxi_nand_spl.c
> +++ b/drivers/mtd/nand/sunxi_nand_spl.c
> @@ -85,6 +85,7 @@
>
> #define SUNXI_DMA_DDMA_CFG_REG_LOADING (1 << 31)
> #define SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32 (2 << 25)
> +#define SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM (1 << 16)
Might want to mention this change (correct DMA type?) in the commit log.
> #define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32 (2 << 9)
> #define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO (1 << 5)
> #define SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC (3 << 0)
> @@ -94,10 +95,6 @@
>
> /* minimal "boot0" style NAND support for Allwinner A20 */
>
> -/* temporary buffer in internal ram */
> -unsigned char temp_buf[CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE]
> - __aligned(0x10) __section(".text#");
> -
> /* random seed used by linux */
> const uint16_t random_seed[128] = {
> 0x2b75, 0x0bd0, 0x5ca3, 0x62d1, 0x1c93, 0x07e9, 0x2162, 0x3a72,
> @@ -167,8 +164,8 @@ void nand_init(void)
> }
> }
>
> -static void nand_read_page(unsigned int real_addr, int syndrome,
> - uint32_t *ecc_errors)
> +static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
> + int syndrome, uint32_t *ecc_errors)
> {
> uint32_t val;
> int ecc_off = 0;
> @@ -226,9 +223,6 @@ static void nand_read_page(unsigned int real_addr, int syndrome,
> return;
> }
>
> - /* clear temp_buf */
> - memset(temp_buf, 0, CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE);
> -
> /* set CMD */
> writel(NFC_SEND_CMD1 | NFC_WAIT_FLAG | NAND_CMD_RESET,
> SUNXI_NFC_BASE + NFC_CMD);
> @@ -278,8 +272,7 @@ static void nand_read_page(unsigned int real_addr, int syndrome,
> writel(SUNXI_NFC_BASE + NFC_IO_DATA,
> SUNXI_DMA_BASE + SUNXI_DMA_SRC_START_ADDR_REG0);
> /* read to RAM */
> - writel((uint32_t)temp_buf,
> - SUNXI_DMA_BASE + SUNXI_DMA_DEST_START_ADDRR_REG0);
> + writel(dst, SUNXI_DMA_BASE + SUNXI_DMA_DEST_START_ADDRR_REG0);
> writel(SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC
> | SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE,
> SUNXI_DMA_BASE + SUNXI_DMA_DDMA_PARA_REG0);
> @@ -287,6 +280,7 @@ static void nand_read_page(unsigned int real_addr, int syndrome,
> SUNXI_DMA_BASE + SUNXI_DMA_DDMA_BC_REG0); /* 1kB */
> writel(SUNXI_DMA_DDMA_CFG_REG_LOADING
> | SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32
> + | SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM
> | SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32
> | SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO
> | SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC,
> @@ -324,27 +318,14 @@ static void nand_read_page(unsigned int real_addr, int syndrome,
> int nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
> {
> void *current_dest;
> - uint32_t count;
> - uint32_t current_count;
> uint32_t ecc_errors = 0;
>
> - memset(dest, 0x0, size); /* clean destination memory */
> for (current_dest = dest;
> current_dest < (dest + size);
> current_dest += CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE) {
> - nand_read_page(offs, offs
> - < CONFIG_NAND_SUNXI_SPL_SYNDROME_PARTITIONS_END,
> - &ecc_errors);
> - count = current_dest - dest;
> -
> - if (size - count > CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE)
> - current_count = CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE;
> - else
> - current_count = size - count;
> -
> - memcpy(current_dest,
> - temp_buf,
> - current_count);
> + nand_read_page(offs, (dma_addr_t)current_dest,
> + offs < CONFIG_NAND_SUNXI_SPL_SYNDROME_PARTITIONS_END,
> + &ecc_errors);
> offs += CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE;
> }
> return ecc_errors ? -1 : 0;
> --
> 2.4.3
>
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