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132 lines
4.0 KiB
Diff
132 lines
4.0 KiB
Diff
From f617846b1e20a2ba59cdd9435715339eaed1e251 Mon Sep 17 00:00:00 2001
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From: Huang Shijie <b32955@freescale.com>
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Date: Wed, 22 May 2013 10:28:27 +0800
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Subject: [PATCH 094/203] mtd: get the ECC info from the Extended Parameter
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Page
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Since the ONFI 2.1, the onfi spec adds the Extended Parameter Page
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to store the ECC info.
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The onfi spec tells us that if the nand chip's recommended ECC codeword
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size is not 512 bytes, then the @ecc_bits is 0xff. The host _SHOULD_ then
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read the Extended ECC information that is part of the extended parameter
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page to retrieve the ECC requirements for this device.
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This patch implement the reading of the Extended Parameter Page, and parses
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the sections for ECC type, and get the ECC info from the ECC section.
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Tested this patch with Micron MT29F64G08CBABAWP.
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Acked-by: Pekon Gupta <pekon@ti.com>
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Signed-off-by: Huang Shijie <b32955@freescale.com>
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Reviewed-and-tested-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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---
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drivers/mtd/nand/nand_base.c | 87 ++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 87 insertions(+)
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--- a/drivers/mtd/nand/nand_base.c
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+++ b/drivers/mtd/nand/nand_base.c
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@@ -2848,6 +2848,78 @@ static u16 onfi_crc16(u16 crc, u8 const
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return crc;
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}
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+/* Parse the Extended Parameter Page. */
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+static int nand_flash_detect_ext_param_page(struct mtd_info *mtd,
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+ struct nand_chip *chip, struct nand_onfi_params *p)
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+{
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+ struct onfi_ext_param_page *ep;
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+ struct onfi_ext_section *s;
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+ struct onfi_ext_ecc_info *ecc;
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+ uint8_t *cursor;
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+ int ret = -EINVAL;
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+ int len;
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+ int i;
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+
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+ len = le16_to_cpu(p->ext_param_page_length) * 16;
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+ ep = kmalloc(len, GFP_KERNEL);
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+ if (!ep) {
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+ ret = -ENOMEM;
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+ goto ext_out;
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+ }
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+
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+ /* Send our own NAND_CMD_PARAM. */
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+ chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
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+
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+ /* Use the Change Read Column command to skip the ONFI param pages. */
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+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
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+ sizeof(*p) * p->num_of_param_pages , -1);
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+
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+ /* Read out the Extended Parameter Page. */
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+ chip->read_buf(mtd, (uint8_t *)ep, len);
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+ if ((onfi_crc16(ONFI_CRC_BASE, ((uint8_t *)ep) + 2, len - 2)
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+ != le16_to_cpu(ep->crc))) {
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+ pr_debug("fail in the CRC.\n");
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+ goto ext_out;
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+ }
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+
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+ /*
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+ * Check the signature.
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+ * Do not strictly follow the ONFI spec, maybe changed in future.
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+ */
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+ if (strncmp(ep->sig, "EPPS", 4)) {
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+ pr_debug("The signature is invalid.\n");
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+ goto ext_out;
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+ }
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+
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+ /* find the ECC section. */
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+ cursor = (uint8_t *)(ep + 1);
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+ for (i = 0; i < ONFI_EXT_SECTION_MAX; i++) {
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+ s = ep->sections + i;
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+ if (s->type == ONFI_SECTION_TYPE_2)
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+ break;
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+ cursor += s->length * 16;
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+ }
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+ if (i == ONFI_EXT_SECTION_MAX) {
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+ pr_debug("We can not find the ECC section.\n");
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+ goto ext_out;
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+ }
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+
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+ /* get the info we want. */
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+ ecc = (struct onfi_ext_ecc_info *)cursor;
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+
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+ if (ecc->codeword_size) {
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+ chip->ecc_strength_ds = ecc->ecc_bits;
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+ chip->ecc_step_ds = 1 << ecc->codeword_size;
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+ }
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+
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+ pr_info("ONFI extended param page detected.\n");
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+ return 0;
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+
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+ext_out:
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+ kfree(ep);
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+ return ret;
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+}
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+
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/*
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* Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
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*/
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@@ -2927,6 +2999,21 @@ static int nand_flash_detect_onfi(struct
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if (p->ecc_bits != 0xff) {
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chip->ecc_strength_ds = p->ecc_bits;
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chip->ecc_step_ds = 512;
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+ } else if (chip->onfi_version >= 21 &&
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+ (onfi_feature(chip) & ONFI_FEATURE_EXT_PARAM_PAGE)) {
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+
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+ /*
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+ * The nand_flash_detect_ext_param_page() uses the
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+ * Change Read Column command which maybe not supported
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+ * by the chip->cmdfunc. So try to update the chip->cmdfunc
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+ * now. We do not replace user supplied command function.
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+ */
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+ if (mtd->writesize > 512 && chip->cmdfunc == nand_command)
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+ chip->cmdfunc = nand_command_lp;
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+
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+ /* The Extended Parameter Page is supported since ONFI 2.1. */
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+ if (nand_flash_detect_ext_param_page(mtd, chip, p))
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+ pr_info("Failed to detect the extended param page.\n");
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}
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pr_info("ONFI flash detected\n");
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