linux-spi.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Pratyush Yadav <p.yadav-l0cyMroinI0@public.gmane.org>
To: Tudor Ambarus
	<tudor.ambarus-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>,
	Miquel Raynal
	<miquel.raynal-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>,
	Richard Weinberger <richard-/L3Ra7n9ekc@public.gmane.org>,
	Vignesh Raghavendra <vigneshr-l0cyMroinI0@public.gmane.org>,
	Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: <linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	<linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Sekhar Nori <nsekhar-l0cyMroinI0@public.gmane.org>,
	Pratyush Yadav <p.yadav-l0cyMroinI0@public.gmane.org>
Subject: [PATCH 6/9] mtd: spi-nor: parse xSPI Profile 1.0 table
Date: Tue, 11 Feb 2020 19:03:45 +0530	[thread overview]
Message-ID: <20200211133348.15558-7-p.yadav@ti.com> (raw)
In-Reply-To: <20200211133348.15558-1-p.yadav-l0cyMroinI0@public.gmane.org>

This table is indication that the flash is xSPI compliant and hence
supports octal DTR mode. Extract information like the fast read opcode,
the number of dummy cycles needed for a Read Status Register command,
and the number of address bytes needed for a Read Status Register
command.

The default dummy cycles for a fast octal DTR read are set to 20. Since
there is no simple way of determining the dummy cycles needed for the
fast read command, flashes that use a different value should update it
in their flash-specific hooks.

Signed-off-by: Pratyush Yadav <p.yadav-l0cyMroinI0@public.gmane.org>
---
 drivers/mtd/spi-nor/spi-nor.c | 80 +++++++++++++++++++++++++++++++++++
 include/linux/mtd/spi-nor.h   |  5 +++
 2 files changed, 85 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index ff0b25754939..eefde5abff8a 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -16,6 +16,7 @@
 #include <linux/sizes.h>
 #include <linux/slab.h>
 #include <linux/sort.h>
+#include <linux/bitfield.h>
 
 #include <linux/mtd/mtd.h>
 #include <linux/of_platform.h>
@@ -58,12 +59,14 @@ struct sfdp_parameter_header {
 #define SFDP_BFPT_ID		0xff00	/* Basic Flash Parameter Table */
 #define SFDP_SECTOR_MAP_ID	0xff81	/* Sector Map Table */
 #define SFDP_4BAIT_ID		0xff84  /* 4-byte Address Instruction Table */
+#define SFDP_PROFILE1_ID	0xff05	/* xSPI Profile 1.0 table. */
 
 #define SFDP_SIGNATURE		0x50444653U
 #define SFDP_JESD216_MAJOR	1
 #define SFDP_JESD216_MINOR	0
 #define SFDP_JESD216A_MINOR	5
 #define SFDP_JESD216B_MINOR	6
+#define SFDP_JESD216D_MINOR	8
 
 struct sfdp_header {
 	u32		signature; /* Ox50444653U <=> "SFDP" */
@@ -158,6 +161,11 @@ struct sfdp_bfpt {
 	u32	dwords[BFPT_DWORD_MAX];
 };
 
+/* xSPI Profile 1.0 table (from JESD216D.01). */
+#define PROFILE1_DWORD1_RD_FAST_CMD		GENMASK(15, 8)
+#define PROFILE1_DWORD1_RDSR_DUMMY		BIT(28)
+#define PROFILE1_DWORD1_RDSR_ADDR_BYTES		BIT(29)
+
 /**
  * struct spi_nor_fixups - SPI NOR fixup hooks
  * @default_init: called after default flash parameters init. Used to tweak
@@ -4426,6 +4434,74 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
 	return ret;
 }
 
+/**
+ * spi_nor_parse_profile1() - parse the xSPI Profile 1.0 table
+ * @nor:		pointer to a 'struct spi_nor'
+ * @param_header:	pointer to the 'struct sfdp_parameter_header' describing
+ *			the 4-Byte Address Instruction Table length and version.
+ * @params:		pointer to the 'struct spi_nor_flash_parameter' to be.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_parse_profile1(struct spi_nor *nor,
+				  const struct sfdp_parameter_header *profile1_header,
+				  struct spi_nor_flash_parameter *params)
+{
+	u32 *table, opcode, addr;
+	size_t len;
+	int ret, i;
+
+	len = profile1_header->length * sizeof(*table);
+	table = kmalloc(len, GFP_KERNEL);
+	if (!table)
+		return -ENOMEM;
+
+	addr = SFDP_PARAM_HEADER_PTP(profile1_header);
+	ret = spi_nor_read_sfdp(nor, addr, len, table);
+	if (ret)
+		goto out;
+
+	/* Fix endianness of the table DWORDs. */
+	for (i = 0; i < profile1_header->length; i++)
+		table[i] = le32_to_cpu(table[i]);
+
+	/* Get 8D-8D-8D fast read opcode and dummy cycles. */
+	opcode = FIELD_GET(PROFILE1_DWORD1_RD_FAST_CMD, table[0]);
+
+	/*
+	 * Update the fast read settings. We set the default dummy cycles to 20
+	 * here. Flashes can change this value if they need to when enabling
+	 * octal mode.
+	 */
+	params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
+	spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_8_8_8_DTR],
+				  0, 20, opcode,
+				  SNOR_PROTO_8_8_8_DTR);
+
+	/*
+	 * Since the flash supports xSPI DTR reads, it should also support DTR
+	 * Page Program opcodes.
+	 */
+	params->hwcaps.mask |= SNOR_HWCAPS_PP_8_8_8_DTR;
+
+	/*
+	 * Set the Read Status Register dummy cycles and dummy address bytes.
+	 */
+	if (table[0] & PROFILE1_DWORD1_RDSR_DUMMY)
+		params->rdsr_dummy = 8;
+	else
+		params->rdsr_dummy = 4;
+
+	if (table[0] & PROFILE1_DWORD1_RDSR_ADDR_BYTES)
+		params->rdsr_addr_nbytes = 4;
+	else
+		params->rdsr_addr_nbytes = 0;
+
+out:
+	kfree(table);
+	return ret;
+}
+
 /**
  * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
  * @nor:		pointer to a 'struct spi_nor'
@@ -4527,6 +4603,10 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
 			err = spi_nor_parse_4bait(nor, param_header, params);
 			break;
 
+		case SFDP_PROFILE1_ID:
+			err = spi_nor_parse_profile1(nor, param_header, params);
+			break;
+
 		default:
 			break;
 		}
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 364f37276d78..f54dbd0f86ab 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -515,6 +515,9 @@ struct spi_nor_locking_ops {
  *
  * @size:		the flash memory density in bytes.
  * @page_size:		the page size of the SPI NOR flash memory.
+ * @rdsr_dummy:		dummy cycles needed for Read Status Register command.
+ * @rdsr_addr_nbytes:	dummy address bytes needed for Read Status Register
+ *			command.
  * @hwcaps:		describes the read and page program hardware
  *			capabilities.
  * @reads:		read capabilities ordered by priority: the higher index
@@ -537,6 +540,8 @@ struct spi_nor_locking_ops {
 struct spi_nor_flash_parameter {
 	u64				size;
 	u32				page_size;
+	u8				rdsr_dummy;
+	u8				rdsr_addr_nbytes;
 
 	struct spi_nor_hwcaps		hwcaps;
 	struct spi_nor_read_command	reads[SNOR_CMD_READ_MAX];
-- 
2.25.0

  parent reply	other threads:[~2020-02-11 13:33 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 13:33 [PATCH 0/9] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
2020-02-11 13:33 ` [PATCH 2/9] spi: spi-mem: allow specifying a command's extension Pratyush Yadav
2020-02-11 13:33 ` [PATCH 3/9] spi: cadence-quadspi: Add support for octal DTR flashes Pratyush Yadav
     [not found] ` <20200211133348.15558-1-p.yadav-l0cyMroinI0@public.gmane.org>
2020-02-11 13:33   ` [PATCH 1/9] spi: spi-mem: allow specifying whether an op is DTR or not Pratyush Yadav
2020-02-11 13:33   ` [PATCH 4/9] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
2020-02-11 13:33   ` [PATCH 5/9] mtd: spi-nor: get command opcode extension type from BFPT Pratyush Yadav
2020-02-11 13:33   ` Pratyush Yadav [this message]
2020-02-11 13:33   ` [PATCH 7/9] mtd: spi-nor: use dummy cycle and address width info from SFDP Pratyush Yadav
2020-02-11 13:33 ` [PATCH 8/9] mtd: spi-nor: enable octal DTR mode when possible Pratyush Yadav
2020-02-11 13:33 ` [PATCH 9/9] mtd: spi-nor: add support for Cypress Semper flash Pratyush Yadav
     [not found]   ` <20200211133348.15558-10-p.yadav-l0cyMroinI0@public.gmane.org>
2020-02-13 10:36     ` [EXT] " Kuldeep Singh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200211133348.15558-7-p.yadav@ti.com \
    --to=p.yadav-l0cymroini0@public.gmane.org \
    --cc=broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
    --cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
    --cc=linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=miquel.raynal-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org \
    --cc=nsekhar-l0cyMroinI0@public.gmane.org \
    --cc=richard-/L3Ra7n9ekc@public.gmane.org \
    --cc=tudor.ambarus-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org \
    --cc=vigneshr-l0cyMroinI0@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).