static uint8_t cs_next;
static __maybe_unused struct nand_ecclayout omap_ecclayout;
+#if defined(CONFIG_NAND_OMAP_GPMC_WSCFG)
+static const int8_t wscfg[CONFIG_SYS_MAX_NAND_DEVICE] =
+ { CONFIG_NAND_OMAP_GPMC_WSCFG };
+#else
+/* wscfg is preset to zero since its a static variable */
+static const int8_t wscfg[CONFIG_SYS_MAX_NAND_DEVICE];
+#endif
+
/*
* Driver configurations
*/
struct omap_nand_info {
struct bch_control *control;
enum omap_ecc ecc_scheme;
- int cs;
+ uint8_t cs;
+ uint8_t ws; /* wait status pin (0,1) */
};
/* We are wasting a bit of memory but al least we are safe */
writeb(cmd, this->IO_ADDR_W);
}
-#ifdef CONFIG_SPL_BUILD
/* Check wait pin as dev ready indicator */
-static int omap_spl_dev_ready(struct mtd_info *mtd)
+static int omap_dev_ready(struct mtd_info *mtd)
{
- return gpmc_cfg->status & (1 << 8);
+ register struct nand_chip *this = mtd->priv;
+ struct omap_nand_info *info = this->priv;
+ return gpmc_cfg->status & (1 << (8 + info->ws));
}
-#endif
-
/*
* gen_true_ecc - This function will generate true ECC value, which
uint32_t error_loc[ELM_MAX_ERROR_COUNT];
enum bch_level bch_type;
uint32_t i, ecc_flag = 0;
- uint8_t count, err = 0;
+ uint8_t count;
uint32_t byte_pos, bit_pos;
+ int err = 0;
/* check calculated ecc */
for (i = 0; i < ecc->bytes && !ecc_flag; i++) {
return (err) ? err : error_count;
}
+#ifdef CONFIG_NAND_OMAP_GPMC_PREFETCH
+
+#define PREFETCH_CONFIG1_CS_SHIFT 24
+#define PREFETCH_FIFOTHRESHOLD_MAX 0x40
+#define PREFETCH_FIFOTHRESHOLD(val) ((val) << 8)
+#define PREFETCH_STATUS_COUNT(val) (val & 0x00003fff)
+#define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F)
+#define ENABLE_PREFETCH (1 << 7)
+
+/**
+ * omap_prefetch_enable - configures and starts prefetch transfer
+ * @fifo_th: fifo threshold to be used for read/ write
+ * @count: number of bytes to be transferred
+ * @is_write: prefetch read(0) or write post(1) mode
+ * @cs: chip select to use
+ */
+static int omap_prefetch_enable(int fifo_th, unsigned int count, int is_write, int cs)
+{
+ uint32_t val;
+
+ if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX)
+ return -EINVAL;
+
+ if (readl(&gpmc_cfg->prefetch_control))
+ return -EBUSY;
+
+ /* Set the amount of bytes to be prefetched */
+ writel(count, &gpmc_cfg->prefetch_config2);
+
+ val = (cs << PREFETCH_CONFIG1_CS_SHIFT) | (is_write & 1) |
+ PREFETCH_FIFOTHRESHOLD(fifo_th) | ENABLE_PREFETCH;
+ writel(val, &gpmc_cfg->prefetch_config1);
+
+ /* Start the prefetch engine */
+ writel(1, &gpmc_cfg->prefetch_control);
+
+ return 0;
+}
+
+/**
+ * omap_prefetch_reset - disables and stops the prefetch engine
+ */
+static void omap_prefetch_reset(void)
+{
+ writel(0, &gpmc_cfg->prefetch_control);
+ writel(0, &gpmc_cfg->prefetch_config1);
+}
+
+static int __read_prefetch_aligned(struct nand_chip *chip, uint32_t *buf, int len)
+{
+ int ret;
+ uint32_t cnt;
+ struct omap_nand_info *info = chip->priv;
+
+ ret = omap_prefetch_enable(PREFETCH_FIFOTHRESHOLD_MAX, len, 0, info->cs);
+ if (ret < 0)
+ return ret;
+
+ do {
+ int i;
+
+ cnt = readl(&gpmc_cfg->prefetch_status);
+ cnt = PREFETCH_STATUS_FIFO_CNT(cnt);
+
+ for (i = 0; i < cnt / 4; i++) {
+ *buf++ = readl(CONFIG_SYS_NAND_BASE);
+ len -= 4;
+ }
+ } while (len);
+
+ omap_prefetch_reset();
+
+ return 0;
+}
+
+static void omap_nand_read_prefetch8(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ int ret;
+ uint32_t head, tail;
+ struct nand_chip *chip = mtd->priv;
+
+ /*
+ * If the destination buffer is unaligned, start with reading
+ * the overlap byte-wise.
+ */
+ head = ((uint32_t) buf) % 4;
+ if (head) {
+ nand_read_buf(mtd, buf, head);
+ buf += head;
+ len -= head;
+ }
+
+ /*
+ * Only transfer multiples of 4 bytes in a pre-fetched fashion.
+ * If there's a residue, care for it byte-wise afterwards.
+ */
+ tail = len % 4;
+
+ ret = __read_prefetch_aligned(chip, (uint32_t *) buf, len - tail);
+ if (ret < 0) {
+ /* fallback in case the prefetch engine is busy */
+ nand_read_buf(mtd, buf, len);
+ } else if (tail) {
+ buf += len - tail;
+ nand_read_buf(mtd, buf, tail);
+ }
+}
+#endif /* CONFIG_NAND_OMAP_GPMC_PREFETCH */
+
/**
* omap_read_page_bch - hardware ecc based page read function
* @mtd: mtd info structure
return -EINVAL;
}
} else {
- err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_SW,
+ if (eccstrength == 1) {
+ err = omap_select_ecc_scheme(nand,
+ OMAP_ECC_HAM1_CODE_SW,
+ mtd->writesize, mtd->oobsize);
+ } else if (eccstrength == 8) {
+ err = omap_select_ecc_scheme(nand,
+ OMAP_ECC_BCH8_CODE_HW_DETECTION_SW,
mtd->writesize, mtd->oobsize);
+ } else {
+ printf("nand: error: unsupported ECC scheme\n");
+ return -EINVAL;
+ }
}
/* Update NAND handling after ECC mode switch */
nand->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_cmd;
omap_nand_info[cs].control = NULL;
omap_nand_info[cs].cs = cs;
+ omap_nand_info[cs].ws = wscfg[cs];
nand->priv = &omap_nand_info[cs];
nand->cmd_ctrl = omap_nand_hwcontrol;
nand->options |= NAND_NO_PADDING | NAND_CACHEPRG;
if (err)
return err;
-#ifdef CONFIG_SPL_BUILD
+ /* TODO: Implement for 16-bit bus width */
if (nand->options & NAND_BUSWIDTH_16)
nand->read_buf = nand_read_buf16;
+#ifdef CONFIG_NAND_OMAP_GPMC_PREFETCH
+ else
+ nand->read_buf = omap_nand_read_prefetch8;
+#else
else
nand->read_buf = nand_read_buf;
- nand->dev_ready = omap_spl_dev_ready;
#endif
+
+ nand->dev_ready = omap_dev_ready;
+
return 0;
}
projects / u-boot / blobdiff