sunxi_nand_spl: Parametrize lowlevel read functions

Parametrize the lowlevel nand_read_page function, instead of directly
using the CONFIG_foo settings for page-size, etc. there and add a few
wrappers / helper functions for calling it.

This is a preparation patch for adding auto-detecting of the nand
parameters like the BROM does.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

diff --git a/drivers/mtd/nand/sunxi_nand_spl.c b/drivers/mtd/nand/sunxi_nand_spl.c
index 872cedf..3206a50 100644 (file)
--- a/drivers/mtd/nand/sunxi_nand_spl.c
+++ b/drivers/mtd/nand/sunxi_nand_spl.c
@@ -179,8 +179,8 @@ void nand_init(void)
        }
 }
 
-static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
-                          int syndrome, uint32_t *ecc_errors)
+static int nand_read_page(int page_size, int ecc_strength, int ecc_page_size,
+       int addr_cycles, uint32_t real_addr, dma_addr_t dst, int syndrome)
 {
        uint32_t val;
        int i, ecc_off = 0;
@@ -188,28 +188,26 @@ static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
        uint16_t rand_seed;
        uint32_t page;
        uint16_t column;
-       uint32_t oob_offset;
        static const u8 strengths[] = { 16, 24, 28, 32, 40, 48, 56, 60, 64 };
 
        for (i = 0; i < ARRAY_SIZE(strengths); i++) {
-               if (CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH == strengths[i]) {
+               if (ecc_strength == strengths[i]) {
                        ecc_mode = i;
                        break;
                }
        }
 
        /* HW ECC always request ECC bytes for 1024 bytes blocks */
-       ecc_off = DIV_ROUND_UP(CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH * fls(8 * 1024), 8);
+       ecc_off = DIV_ROUND_UP(ecc_strength * fls(8 * 1024), 8);
        /* HW ECC always work with even numbers of ECC bytes */
        ecc_off += (ecc_off & 1);
        ecc_off += 4; /* prepad */
 
-       page = real_addr / CONFIG_NAND_SUNXI_SPL_PAGE_SIZE;
-       column = real_addr % CONFIG_NAND_SUNXI_SPL_PAGE_SIZE;
+       page = real_addr / page_size;
+       column = real_addr % page_size;
 
        if (syndrome)
-               column += (column / CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE)
-                       * ecc_off;
+               column += (column / ecc_page_size) * ecc_off;
 
        /* clear ecc status */
        writel(0, SUNXI_NFC_BASE + NFC_ECC_ST);
@@ -227,16 +225,11 @@ static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
        val = readl(SUNXI_NFC_BASE + NFC_CTL);
        writel(val | NFC_CTL_RAM_METHOD, SUNXI_NFC_BASE + NFC_CTL);
 
-       if (!syndrome) {
-               oob_offset = CONFIG_NAND_SUNXI_SPL_PAGE_SIZE
-                       + (column / CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE)
-                       * ecc_off;
-               writel(oob_offset, SUNXI_NFC_BASE + NFC_SPARE_AREA);
-       }
+       if (!syndrome)
+               writel(page_size + (column / ecc_page_size) * ecc_off,
+                      SUNXI_NFC_BASE + NFC_SPARE_AREA);
 
-       flush_dcache_range(dst,
-                          ALIGN(dst + CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
-                                ARCH_DMA_MINALIGN));
+       flush_dcache_range(dst, ALIGN(dst + ecc_page_size, ARCH_DMA_MINALIGN));
 
        /* SUNXI_DMA */
        writel(0x0, SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0); /* clr dma cmd */
@@ -248,7 +241,7 @@ static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
        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);
-       writel(CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
+       writel(ecc_page_size,
               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
@@ -267,47 +260,64 @@ static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
               SUNXI_NFC_BASE + NFC_ADDR_LOW);
        writel((page >> 16) & 0xFF, SUNXI_NFC_BASE + NFC_ADDR_HIGH);
        writel(NFC_SEND_CMD1 | NFC_SEND_CMD2 | NFC_DATA_TRANS |
-               NFC_PAGE_CMD | NFC_WAIT_FLAG | (4 << NFC_ADDR_NUM_OFFSET) |
+               NFC_PAGE_CMD | NFC_WAIT_FLAG |
+               ((addr_cycles - 1) << NFC_ADDR_NUM_OFFSET) |
                NFC_SEND_ADR | NFC_DATA_SWAP_METHOD | (syndrome ? NFC_SEQ : 0),
                SUNXI_NFC_BASE + NFC_CMD);
 
        if (!check_value(SUNXI_NFC_BASE + NFC_ST, (1 << 2),
                         MAX_RETRIES)) {
                printf("Error while initializing dma interrupt\n");
-               return;
+               return -1;
        }
 
        if (!check_value_negated(SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0,
                                 SUNXI_DMA_DDMA_CFG_REG_LOADING, MAX_RETRIES)) {
                printf("Error while waiting for dma transfer to finish\n");
-               return;
+               return -1;
        }
 
        invalidate_dcache_range(dst,
-                       ALIGN(dst + CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
-                             ARCH_DMA_MINALIGN));
+                               ALIGN(dst + ecc_page_size, ARCH_DMA_MINALIGN));
 
        if (readl(SUNXI_NFC_BASE + NFC_ECC_ST))
-               (*ecc_errors)++;
+               return -1;
+
+       return 0;
 }
 
-int nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
+static int nand_read_ecc(int page_size, int ecc_strength, int ecc_page_size,
+       int addr_cycles, uint32_t offs, uint32_t size, void *dest, int syndrome)
 {
-       void *current_dest;
-       uint32_t ecc_errors = 0;
+       void *end = dest + size;
 
        clrsetbits_le32(SUNXI_NFC_BASE + NFC_CTL, NFC_CTL_PAGE_SIZE_MASK,
-                       NFC_CTL_PAGE_SIZE(CONFIG_NAND_SUNXI_SPL_PAGE_SIZE));
-
-       for (current_dest = dest;
-                       current_dest < (dest + size);
-                       current_dest += CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE) {
-               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;
+                       NFC_CTL_PAGE_SIZE(page_size));
+
+       for ( ;dest < end; dest += ecc_page_size, offs += ecc_page_size) {
+               if (nand_read_page(page_size, ecc_strength, ecc_page_size,
+                                  addr_cycles, offs, (dma_addr_t)dest,
+                                  syndrome))
+                       return -1;
        }
-       return ecc_errors ? -1 : 0;
+
+       return 0;
+}
+
+static int nand_read_buffer(uint32_t offs, unsigned int size, void *dest,
+                           int syndrome)
+{
+       return nand_read_ecc(CONFIG_NAND_SUNXI_SPL_PAGE_SIZE,
+                            CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH,
+                            CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
+                            5, offs, size, dest, syndrome);
+}
+
+int nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
+{
+       int syndrome = offs < CONFIG_NAND_SUNXI_SPL_SYNDROME_PARTITIONS_END;
+
+       return nand_read_buffer(offs, size, dest, syndrome);
 }
 
 void nand_deselect(void)