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