mtd: nand: atmel: prepare for nand spl boot support

Prepare for nand spl boot support. It supports nand software ECC and
hardware PMECC.
This patch is take <drivers/mtd/nand/nand_spl_simple.c> as reference.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

drivers/mtd/nand/atmel_nand.c

@@ -31,6 +31,10 @@
 
 #ifdef CONFIG_ATMEL_NAND_HW_PMECC
 
+#ifdef CONFIG_SPL_BUILD
+#undef CONFIG_SYS_NAND_ONFI_DETECTION
+#endif
+
 struct atmel_nand_host {
 	struct pmecc_regs __iomem *pmecc;
 	struct pmecc_errloc_regs __iomem *pmerrloc;
@@ -1169,6 +1173,209 @@ static int at91_nand_ready(struct mtd_info *mtd)
 }
 #endif
 
+#ifdef CONFIG_SPL_BUILD
+/* The following code is for SPL */
+static nand_info_t mtd;
+static struct nand_chip nand_chip;
+
+static int nand_command(int block, int page, uint32_t offs, u8 cmd)
+{
+	struct nand_chip *this = mtd.priv;
+	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
+	void (*hwctrl)(struct mtd_info *mtd, int cmd,
+			unsigned int ctrl) = this->cmd_ctrl;
+
+	while (this->dev_ready(&mtd))
+		;
+
+	if (cmd == NAND_CMD_READOOB) {
+		offs += CONFIG_SYS_NAND_PAGE_SIZE;
+		cmd = NAND_CMD_READ0;
+	}
+
+	hwctrl(&mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+
+	if (this->options & NAND_BUSWIDTH_16)
+		offs >>= 1;
+
+	hwctrl(&mtd, offs & 0xff, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
+	hwctrl(&mtd, (offs >> 8) & 0xff, NAND_CTRL_ALE);
+	hwctrl(&mtd, (page_addr & 0xff), NAND_CTRL_ALE);
+	hwctrl(&mtd, ((page_addr >> 8) & 0xff), NAND_CTRL_ALE);
+#ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
+	hwctrl(&mtd, (page_addr >> 16) & 0x0f, NAND_CTRL_ALE);
+#endif
+	hwctrl(&mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
+
+	hwctrl(&mtd, NAND_CMD_READSTART, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+	hwctrl(&mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
+
+	while (this->dev_ready(&mtd))
+		;
+
+	return 0;
+}
+
+static int nand_is_bad_block(int block)
+{
+	struct nand_chip *this = mtd.priv;
+
+	nand_command(block, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS, NAND_CMD_READOOB);
+
+	if (this->options & NAND_BUSWIDTH_16) {
+		if (readw(this->IO_ADDR_R) != 0xffff)
+			return 1;
+	} else {
+		if (readb(this->IO_ADDR_R) != 0xff)
+			return 1;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_SPL_NAND_ECC
+static int nand_ecc_pos[] = CONFIG_SYS_NAND_ECCPOS;
+#define ECCSTEPS (CONFIG_SYS_NAND_PAGE_SIZE / \
+		  CONFIG_SYS_NAND_ECCSIZE)
+#define ECCTOTAL (ECCSTEPS * CONFIG_SYS_NAND_ECCBYTES)
+
+static int nand_read_page(int block, int page, void *dst)
+{
+	struct nand_chip *this = mtd.priv;
+	u_char ecc_calc[ECCTOTAL];
+	u_char ecc_code[ECCTOTAL];
+	u_char oob_data[CONFIG_SYS_NAND_OOBSIZE];
+	int eccsize = CONFIG_SYS_NAND_ECCSIZE;
+	int eccbytes = CONFIG_SYS_NAND_ECCBYTES;
+	int eccsteps = ECCSTEPS;
+	int i;
+	uint8_t *p = dst;
+	nand_command(block, page, 0, NAND_CMD_READ0);
+
+	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+		if (this->ecc.mode != NAND_ECC_SOFT)
+			this->ecc.hwctl(&mtd, NAND_ECC_READ);
+		this->read_buf(&mtd, p, eccsize);
+		this->ecc.calculate(&mtd, p, &ecc_calc[i]);
+	}
+	this->read_buf(&mtd, oob_data, CONFIG_SYS_NAND_OOBSIZE);
+
+	for (i = 0; i < ECCTOTAL; i++)
+		ecc_code[i] = oob_data[nand_ecc_pos[i]];
+
+	eccsteps = ECCSTEPS;
+	p = dst;
+
+	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+		this->ecc.correct(&mtd, p, &ecc_code[i], &ecc_calc[i]);
+
+	return 0;
+}
+#else
+static int nand_read_page(int block, int page, void *dst)
+{
+	struct nand_chip *this = mtd.priv;
+
+	nand_command(block, page, 0, NAND_CMD_READ0);
+	atmel_nand_pmecc_read_page(&mtd, this, dst, 0, page);
+
+	return 0;
+}
+#endif /* CONFIG_SPL_NAND_ECC */
+
+int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
+{
+	unsigned int block, lastblock;
+	unsigned int page;
+
+	block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
+	lastblock = (offs + size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
+	page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;
+
+	while (block <= lastblock) {
+		if (!nand_is_bad_block(block)) {
+			while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
+				nand_read_page(block, page, dst);
+				dst += CONFIG_SYS_NAND_PAGE_SIZE;
+				page++;
+			}
+
+			page = 0;
+		} else {
+			lastblock++;
+		}
+
+		block++;
+	}
+
+	return 0;
+}
+
+int at91_nand_wait_ready(struct mtd_info *mtd)
+{
+	struct nand_chip *this = mtd->priv;
+
+	udelay(this->chip_delay);
+
+	return 0;
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	int ret = 0;
+
+	nand->ecc.mode = NAND_ECC_SOFT;
+#ifdef CONFIG_SYS_NAND_DBW_16
+	nand->options = NAND_BUSWIDTH_16;
+	nand->read_buf = nand_read_buf16;
+#else
+	nand->read_buf = nand_read_buf;
+#endif
+	nand->cmd_ctrl = at91_nand_hwcontrol;
+#ifdef CONFIG_SYS_NAND_READY_PIN
+	nand->dev_ready = at91_nand_ready;
+#else
+	nand->dev_ready = at91_nand_wait_ready;
+#endif
+	nand->chip_delay = 20;
+
+#ifdef CONFIG_ATMEL_NAND_HWECC
+#ifdef CONFIG_ATMEL_NAND_HW_PMECC
+	ret = atmel_pmecc_nand_init_params(nand, &mtd);
+#endif
+#endif
+
+	return ret;
+}
+
+void nand_init(void)
+{
+	mtd.writesize = CONFIG_SYS_NAND_PAGE_SIZE;
+	mtd.oobsize = CONFIG_SYS_NAND_OOBSIZE;
+	mtd.priv = &nand_chip;
+	nand_chip.IO_ADDR_R = (void __iomem *)CONFIG_SYS_NAND_BASE;
+	nand_chip.IO_ADDR_W = (void __iomem *)CONFIG_SYS_NAND_BASE;
+	board_nand_init(&nand_chip);
+
+#ifdef CONFIG_SPL_NAND_ECC
+	if (nand_chip.ecc.mode == NAND_ECC_SOFT) {
+		nand_chip.ecc.calculate = nand_calculate_ecc;
+		nand_chip.ecc.correct = nand_correct_data;
+	}
+#endif
+
+	if (nand_chip.select_chip)
+		nand_chip.select_chip(&mtd, 0);
+}
+
+void nand_deselect(void)
+{
+	if (nand_chip.select_chip)
+		nand_chip.select_chip(&mtd, -1);
+}
+
+#else
+
 #ifndef CONFIG_SYS_NAND_BASE_LIST
 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
 #endif
@@ -1227,3 +1434,4 @@ void board_nand_init(void)
 			dev_err(host->dev, "atmel_nand: Fail to initialize #%d chip",
 				i);
 }
+#endif /* CONFIG_SPL_BUILD */

include/nand.h

@@ -21,10 +21,16 @@
  * at the same time, so do it here.  When all drivers are
  * converted, this will go away.
  */
+#ifdef CONFIG_SPL_BUILD
+#if defined(CONFIG_NAND_FSL_ELBC) || defined(CONFIG_NAND_FSL_IFC)
+#define CONFIG_SYS_NAND_SELF_INIT
+#endif
+#else
 #if defined(CONFIG_NAND_FSL_ELBC) || defined(CONFIG_NAND_ATMEL)\
 	|| defined(CONFIG_NAND_FSL_IFC)
 #define CONFIG_SYS_NAND_SELF_INIT
 #endif
+#endif
 
 extern void nand_init(void);