[U-Boot] Patches to support Ramtron SPI FRAMs

[U-Boot] Patches to support Ramtron SPI FRAMs

[Reinhard Meyer]

Patch 1 adds generalisation to spi_flash.c to allow for table driven
probing of JEDEC and NON-JEDEC conformant devices

Patch 2 adds the actual Ramtron support

Patch 2 requires Patch 1 to be applied first.

[U-Boot] [PATCH v3] MTD/SPI: introduce table driven probing

[Reinhard Meyer]

for JEDEC devices without and with extension bytes
for non JEDEC devices
Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
---
 drivers/mtd/spi/spi_flash.c |  139 +++++++++++++++++++++++++++++--------------
 1 files changed, 94 insertions(+), 45 deletions(-)

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index ea875dc..099eb4a 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -1,8 +1,26 @@
 /*
- * SPI flash interface
+ * (C) Copyright 2010
+ * Reinhard Meyer, EMK Elektronik, reinhard.meyer at emk-elektronik.de
  *
  * Copyright (C) 2008 Atmel Corporation
- * Licensed under the GPL-2 or later.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
  */
 
 #include <common.h>
@@ -96,13 +114,59 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
 	return ret;
 }
 
+/*
+ * the following table holds all device probe functions
+ *
+ * shift:  number of continuation bytes before the ID
+ * idcode: the expected IDCODE or 0xff for non JEDEC devices
+ * probe:  the function to call
+ *
+ * non JEDEC devices should be ordered in the table such that
+ * the probe functions with best detection algorithms come first
+ *
+ * several matching entries are permitted, they will be tried
+ * in sequence until a probe function returns non NULL
+ *
+ * IDBUF_LEN may be redefined if a device detection requires
+ * more then 5 bytes read.
+ */
+#define IDBUF_LEN 5
+const struct {
+	const u8 shift;
+	const u8 idcode;
+	struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
+} flashes[] = {
+#ifdef CONFIG_SPI_FLASH_SPANSION
+	{ 0, 0x01, spi_flash_probe_spansion, },
+#endif
+#ifdef CONFIG_SPI_FLASH_ATMEL
+	{ 0, 0x1F, spi_flash_probe_atmel, },
+#endif
+#ifdef CONFIG_SPI_FLASH_MACRONIX
+	{ 0, 0xc2, spi_flash_probe_macronix, },
+#endif
+#ifdef CONFIG_SPI_FLASH_WINBOND
+	{ 0, 0xef, spi_flash_probe_winbond, },
+#endif
+#ifdef CONFIG_SPI_FLASH_STMICRO
+	{ 0, 0x20, spi_flash_probe_stmicro, },
+	{ 0, 0xff, spi_flash_probe_stmicro, },
+#endif
+#ifdef CONFIG_SPI_FLASH_SST
+	{ 0, 0xBF, spi_flash_probe_sst, },
+#endif
+};
+
 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 		unsigned int max_hz, unsigned int spi_mode)
 {
 	struct spi_slave *spi;
-	struct spi_flash *flash;
+	struct spi_flash *flash = NULL;
 	int ret;
-	u8 idcode[5];
+	int shift;
+	int i;
+	u8 idbuf[IDBUF_LEN];
+	u8 *idp;
 
 	spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
 	if (!spi) {
@@ -117,53 +181,38 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	}
 
 	/* Read the ID codes */
-	ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
+	ret = spi_flash_cmd(spi, CMD_READ_ID, &idbuf, sizeof(idbuf));
 	if (ret)
 		goto err_read_id;
 
-	debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0],
-			idcode[1], idcode[2], idcode[3], idcode[4]);
-
-	switch (idcode[0]) {
-#ifdef CONFIG_SPI_FLASH_SPANSION
-	case 0x01:
-		flash = spi_flash_probe_spansion(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_ATMEL
-	case 0x1F:
-		flash = spi_flash_probe_atmel(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_MACRONIX
-	case 0xc2:
-		flash = spi_flash_probe_macronix(spi, idcode);
-		break;
+#ifdef DEBUG
+	printf("SF: Got idcodes\n");
+	print_buffer(0, idbuf, 1, sizeof(idbuf), 0);
 #endif
-#ifdef CONFIG_SPI_FLASH_WINBOND
-	case 0xef:
-		flash = spi_flash_probe_winbond(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_STMICRO
-	case 0x20:
-	case 0xff: /* Let the stmicro func handle non-JEDEC ids */
-		flash = spi_flash_probe_stmicro(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_SST
-	case 0xBF:
-		flash = spi_flash_probe_sst(spi, idcode);
-		break;
-#endif
-	default:
-		printf("SF: Unsupported manufacturer %02X\n", idcode[0]);
-		flash = NULL;
-		break;
-	}
 
-	if (!flash)
+	/*
+	 * count the number of continuation bytes, but
+	 * leave at least 3 bytes to the end of the buffer untouched
+	 */
+	for (shift = 0, idp = idbuf;
+		shift < (sizeof(idbuf) - 3) && *idp == 0x7f;
+			shift++, idp++)
+		;
+
+	/* search the table for matches in shift and id */
+	for (i = 0; i < ARRAY_SIZE(flashes); i++) {
+		if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
+			/* we have a match, call probe */
+			flash = flashes[i].probe(spi, idp);
+			if (flash)
+				break;
+		}
+	}
+	
+	if (!flash) {
+		printf("SF: Unsupported manufacturer %02X\n", *idp);
 		goto err_manufacturer_probe;
+	}
 
 	spi_release_bus(spi);
 
-- 
1.5.6.5

[U-Boot] [PATCH v3] MTD/SPI: add support for Ramtron FRAMs

[Reinhard Meyer]

JEDEC types
non JEDEC types

Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
---
 drivers/mtd/spi/Makefile             |    1 +
 drivers/mtd/spi/ramtron.c            |  321 ++++++++++++++++++++++++++++++++++
 drivers/mtd/spi/spi_flash.c          |    8 +
 drivers/mtd/spi/spi_flash_internal.h |    1 +
 4 files changed, 331 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mtd/spi/ramtron.c

diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 4f11b36..a082ca7 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -32,6 +32,7 @@ COBJS-$(CONFIG_SPI_FLASH_SPANSION)	+= spansion.o
 COBJS-$(CONFIG_SPI_FLASH_SST)	+= sst.o
 COBJS-$(CONFIG_SPI_FLASH_STMICRO)	+= stmicro.o
 COBJS-$(CONFIG_SPI_FLASH_WINBOND)	+= winbond.o
+COBJS-$(CONFIG_SPI_FRAM_RAMTRON)	+= ramtron.o
 COBJS-$(CONFIG_SPI_M95XXX) += eeprom_m95xxx.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/mtd/spi/ramtron.c b/drivers/mtd/spi/ramtron.c
new file mode 100644
index 0000000..4766727
--- /dev/null
+++ b/drivers/mtd/spi/ramtron.c
@@ -0,0 +1,321 @@
+/*
+ * (C) Copyright 2010
+ * Reinhard Meyer, EMK Elektronik, reinhard.meyer at emk-elektronik.de
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Note: RAMTRON SPI FRAMs are ferroelectric, nonvolatile RAMs
+ * with an interface identical to SPI flash devices.
+ * However since they behave like RAM there are no delays or
+ * busy polls required. They can sustain read or write at the
+ * allowed SPI bus speed, which can be 40 MHz for some devices.
+ *
+ * Unfortunately some RAMTRON devices do not have a means of
+ * identifying them. They will leave the SO line undriven when
+ * the READ-ID command is issued. It is therefore mandatory
+ * that the MISO line has a proper pull-up, so that READ-ID
+ * will return a row of 0xff. This 0xff pseudo-id will cause
+ * probes by all vendor specific functions that are designed
+ * to handle it. If the MISO line is not pulled up, READ-ID
+ * could return any random noise, even mimicking another
+ * device.
+ *
+ * We use CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+ * to define which device will be assumed after a simple status
+ * register verify. This method is prone to false positive
+ * detection and should therefore be the last to be tried.
+ * Enter it in the last position in the table in spi_flash.c!
+ *
+ * The define CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC both activates
+ * compilation of the special handler and defines the device
+ * to assume.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi_flash.h>
+#include "spi_flash_internal.h"
+
+/* RAMTRON commands common to all devices */
+#define CMD_RAMTRON_WREN	0x06	/* Write Enable */
+#define CMD_RAMTRON_WRDI	0x04	/* Write Disable */
+#define CMD_RAMTRON_RDSR	0x05	/* Read Status Register */
+#define CMD_RAMTRON_WRSR	0x01	/* Write Status Register */
+#define CMD_RAMTRON_READ	0x03	/* Read Data Bytes */
+#define CMD_RAMTRON_WRITE	0x02	/* Write Data Bytes */
+/* not all have those: */
+#define CMD_RAMTRON_FSTRD	0x0b	/* Fast Read (for compatibility - not used here) */
+#define CMD_RAMTRON_SLEEP	0xb9	/* Enter Sleep Mode */
+#define CMD_RAMTRON_RDID	0x9f	/* Read ID */
+#define CMD_RAMTRON_SNR		0xc3	/* Read Serial Number */
+
+/*
+ * Properties of supported FRAMs
+ * Note: speed is currently not used because we have no method to deliver that
+ * value to the upper layers
+ */
+struct ramtron_spi_fram_params {
+	u32	size;		/* size in bytes */
+	u8	addr_len;	/* number of address bytes */
+	u8	merge_cmd;	/* some address bits are in the command byte */
+	u8	id1;		/* device ID 1 (family, density) */
+	u8	id2;		/* device ID 2 (sub, rev, rsvd) */
+	u32	speed;		/* max. SPI clock in Hz */
+	const char *name;	/* name for display and/or matching */
+};
+
+struct ramtron_spi_fram {
+	struct spi_flash flash;
+	const struct ramtron_spi_fram_params *params;
+};
+
+static inline struct ramtron_spi_fram *to_ramtron_spi_fram(struct spi_flash
+							     *flash)
+{
+	return container_of(flash, struct ramtron_spi_fram, flash);
+}
+
+/*
+ * table describing supported FRAM chips:
+ * chips without RDID command must have the values 0xff for id1 and id2
+ */
+static const struct ramtron_spi_fram_params ramtron_spi_fram_table[] = {
+	{
+		.size = 32*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x22,
+		.id2 = 0x00,
+		.speed = 40000000,
+		.name = "FM25V02",
+	},
+	{
+		.size = 32*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x22,
+		.id2 = 0x01,
+		.speed = 40000000,
+		.name = "FM25VN02",
+	},
+	{
+		.size = 64*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x23,
+		.id2 = 0x00,
+		.speed = 40000000,
+		.name = "FM25V05",
+	},
+	{
+		.size = 64*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x23,
+		.id2 = 0x01,
+		.speed = 40000000,
+		.name = "FM25VN05",
+	},
+	{
+		.size = 128*1024,
+		.addr_len = 3,
+		.merge_cmd = 0,
+		.id1 = 0x24,
+		.id2 = 0x00,
+		.speed = 40000000,
+		.name = "FM25V10",
+	},
+	{
+		.size = 128*1024,
+		.addr_len = 3,
+		.merge_cmd = 0,
+		.id1 = 0x24,
+		.id2 = 0x01,
+		.speed = 40000000,
+		.name = "FM25VN10",
+	},
+#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	{
+		.size = 256*1024,
+		.addr_len = 3,
+		.merge_cmd = 0,
+		.id1 = 0xff,
+		.id2 = 0xff,
+		.speed = 40000000,
+		.name = "FM25H20",
+	},
+#endif
+};
+
+static int ramtron_common(struct spi_flash *flash,
+		u32 offset, size_t len, void *buf, u8 command)
+{
+	struct ramtron_spi_fram *sn = to_ramtron_spi_fram(flash);
+	u8 cmd[4];
+	int cmd_len;
+	int ret;
+
+	if (sn->params->addr_len == 3 && sn->params->merge_cmd == 0) {
+		cmd[0] = command;
+		cmd[1] = offset >> 16;
+		cmd[2] = offset >> 8;
+		cmd[3] = offset;
+		cmd_len = 4;
+	}
+	else if (sn->params->addr_len == 2 && sn->params->merge_cmd == 0) {
+		cmd[0] = command;
+		cmd[1] = offset >> 8;
+		cmd[2] = offset;
+		cmd_len = 3;
+	}
+	else {
+		printf("SF: unsupported addr_len or merge_cmd\n");
+		return -1;
+	}
+
+	/* claim the bus */
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		debug("SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	if (command == CMD_RAMTRON_WRITE) {
+		/* send WREN */
+		ret = spi_flash_cmd(flash->spi, CMD_RAMTRON_WREN, NULL, 0);
+		if (ret < 0) {
+			debug("SF: Enabling Write failed\n");
+			goto releasebus;
+		}
+	}
+
+	/* do the transaction */
+	if (command == CMD_RAMTRON_WRITE)
+		ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len, buf, len);
+	else
+		ret = spi_flash_cmd_read(flash->spi, cmd, cmd_len, buf, len);
+	if (ret < 0)
+		debug("SF: Transaction failed\n");
+
+releasebus:
+	/* release the bus */
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+static int ramtron_read(struct spi_flash *flash,
+		u32 offset, size_t len, void *buf)
+{
+	return ramtron_common(flash, offset, len, buf,
+		CMD_RAMTRON_READ);
+}
+
+static int ramtron_write(struct spi_flash *flash,
+		u32 offset, size_t len, const void *buf)
+{
+	return ramtron_common(flash, offset, len, (void *)buf,
+		CMD_RAMTRON_WRITE);
+}
+
+int ramtron_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+	debug("SF: Erase of RAMTRON FRAMs is pointless\n");
+	return -1;
+}
+
+/*
+ * nore: we are called here with idcode pointing to the first non-0x7f byte
+ * already!
+ */
+struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, u8 *idcode)
+{
+	const struct ramtron_spi_fram_params *params;
+	struct ramtron_spi_fram *sn;
+	unsigned int i;
+#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	int ret;
+	u8 sr;
+#endif
+
+	/* NOTE: the bus has been claimed before this function is called! */
+	switch (idcode[0]) {
+	case 0xc2:
+		/* JEDEC conformant RAMTRON id */
+		for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) {
+			params = &ramtron_spi_fram_table[i];
+			if (idcode[1] == params->id1 && idcode[2] == params->id2)
+				goto found;
+		}
+		break;
+#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	case 0xff:
+		/*
+		 * probably open MISO line, pulled up.
+		 * We COULD have a non JEDEC conformant FRAM here,
+		 * read the status register to verify
+		 */
+		ret = spi_flash_cmd(spi, CMD_RAMTRON_RDSR, &sr, 1);
+		if (ret)
+			return NULL;
+
+		/* Bits 5,4,0 are fixed 0 for all devices */
+		if ((sr & 0x31) != 0x00)
+			return NULL;						
+		/* now find the device */
+		for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) {
+			params = &ramtron_spi_fram_table[i];
+			if (!strcmp(params->name, CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC))
+				goto found;
+		}
+		debug("SF: Unsupported non-JEDEC RAMTRON device "
+			CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC "\n");
+		break;
+#endif
+	default:
+		break;
+	}
+
+	/* arriving here means no method has found a device we can handle */
+	debug("SF/ramtron: unsupported device id0=%02x id1=%02x id2=%02x\n",
+		idcode[0], idcode[1], idcode[2]);
+	return NULL;
+
+found:
+	sn = malloc(sizeof(struct ramtron_spi_fram));
+	if (!sn) {
+		debug("SF: Failed to allocate memory\n");
+		return NULL;
+	}
+
+	sn->params = params;
+	sn->flash.spi = spi;
+	sn->flash.name = params->name;
+
+	sn->flash.write = ramtron_write;
+	sn->flash.read = ramtron_read;
+	sn->flash.erase = ramtron_erase;
+	sn->flash.size = params->size;
+
+	printf("SF: Detected %s with size ", params->name);
+	print_size(sn->flash.size, "\n");
+
+	return &sn->flash;
+}
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 099eb4a..4ad490a 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -155,6 +155,14 @@ const struct {
 #ifdef CONFIG_SPI_FLASH_SST
 	{ 0, 0xBF, spi_flash_probe_sst, },
 #endif
+#ifdef CONFIG_SPI_FRAM_RAMTRON
+	{ 6, 0xc2, spi_fram_probe_ramtron, },
+# ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	{ 0, 0xff, spi_fram_probe_ramtron, },
+# endif
+# undef IDBUF_LEN
+# define IDBUF_LEN 9 /* we need to read 6+3 bytes */
+#endif
 };
 
 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index 08546fb..9bc43dd 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -50,3 +50,4 @@ struct spi_flash *spi_flash_probe_macronix(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode);
+struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, u8 *idcode);
-- 
1.5.6.5

[U-Boot] Patches to support Ramtron SPI FRAMs

[Wolfgang Denk]

Dear Reinhard Meyer,

In message <1284302113-7939-1-git-send-email-u-boot@emk-elektronik.de> you wrote:
> Patch 1 adds generalisation to spi_flash.c to allow for table driven
> probing of JEDEC and NON-JEDEC conformant devices
> 
> Patch 2 adds the actual Ramtron support
> 
> Patch 2 requires Patch 1 to be applied first.

In this case patches MUST be numbered.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
The only solution is ... a balance of power. We  arm  our  side  with
exactly  that  much  more.  A balance of power -- the trickiest, most
difficult, dirtiest game of them all. But the only one that preserves
both sides.
	-- Kirk, "A Private Little War", stardate 4211.8

[U-Boot] Patches to support Ramtron SPI FRAMs

[Reinhard Meyer]

Dear Wolfgang Denk,
> In this case patches MUST be numbered.

I know, and I expected them to be numbered by send-email, but I have to
have them numbered by format-patch. But there is now the catch that I got 8
commits and it numbers consequently 1/8, 2/8. What simple trick allows me to
format-patch only HEAD~8 and HEAD~7 ?

Reinhard

[U-Boot] Patches to support Ramtron SPI FRAMs

[Wolfgang Denk]

Dear Reinhard Meyer,

In message <4C8CF3FF.1040806@emk-elektronik.de> you wrote:
> 
> I know, and I expected them to be numbered by send-email, but I have to
> have them numbered by format-patch. But there is now the catch that I got 8
> commits and it numbers consequently 1/8, 2/8. What simple trick allows me to
> format-patch only HEAD~8 and HEAD~7 ?

git format-patch -n HEAD~9..HEAD~7  ?

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
It's certainly  convenient  the  way  the  crime  (or  condition)  of
stupidity   carries   with   it  its  own  punishment,  automatically
admisistered without remorse, pity, or prejudice. :-)
         -- Tom Christiansen in <559seq$ag1$1@csnews.cs.colorado.edu>

[U-Boot] Patches to support Ramtron SPI FRAMs

[Reinhard Meyer]

Dear Wolfgang Denk,
>> I know, and I expected them to be numbered by send-email, but I have to
>> have them numbered by format-patch. But there is now the catch that I got 8
>> commits and it numbers consequently 1/8, 2/8. What simple trick allows me to
>> format-patch only HEAD~8 and HEAD~7 ?
>
> git format-patch -n HEAD~9..HEAD~7  ?

Thanks. Way too simple to see the dots through a big redwood board.
(though I'd use HEAD~8..HEAD~7)

Is there a similar simple trick to produce the 0/n e-Mail? I mean without
hand entering Subject and Body into the send-email phase? Like having it
in a prepared file?

Reinhard

[U-Boot] Patches to support Ramtron SPI FRAMs

[Wolfgang Denk]

Dear Reinhard Meyer,

In message <4C8D212F.2010503@emk-elektronik.de> you wrote:
>
> >> I know, and I expected them to be numbered by send-email, but I have to
> >> have them numbered by format-patch. But there is now the catch that I got 8
> >> commits and it numbers consequently 1/8, 2/8. What simple trick allows me to
> >> format-patch only HEAD~8 and HEAD~7 ?
> >
> > git format-patch -n HEAD~9..HEAD~7  ?
> 
> Thanks. Way too simple to see the dots through a big redwood board.
> (though I'd use HEAD~8..HEAD~7)

This would give you only a single patch, representing the commit at
HEAD~7

> Is there a similar simple trick to produce the 0/n e-Mail? I mean without
> hand entering Subject and Body into the send-email phase? Like having it
> in a prepared file?

Maybe the "--compose" to "git send-email" is what you are looking for:

       --compose
           Invoke a text editor (see GIT_EDITOR in git-var(1)) to edit an introductory
           message for the patch series.

           When --compose is used, git send-email will use the From, Subject, and
           In-Reply-To headers specified in the message. If the body of the message (what
           you type after the headers and a blank line) only contains blank (or GIT:
           prefixed) lines the summary won't be sent, but From, Subject, and In-Reply-To
           headers will be used unless they are removed.

           Missing From or In-Reply-To headers will be prompted for.

           See the CONFIGURATION section for sendemail.multiedit.


Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Respect is a rational process
	-- McCoy, "The Galileo Seven", stardate 2822.3

[U-Boot] Patches to support Ramtron SPI FRAMs

[Reinhard Meyer]

Dear Wolfgang Denk,
>> Thanks. Way too simple to see the dots through a big redwood board.
>> (though I'd use HEAD~8..HEAD~7)
>
> This would give you only a single patch, representing the commit at
> HEAD~7

Thanks for clarifying! Interesting logic, however ;)

>
>> Is there a similar simple trick to produce the 0/n e-Mail? I mean without
>> hand entering Subject and Body into the send-email phase? Like having it
>> in a prepared file?
>
> Maybe the "--compose" to "git send-email" is what you are looking for:

I had used that one. It just seemed awkward to have a text editor open
and then to read a file into it...

Reinhard

[U-Boot] Patches to support Ramtron SPI FRAMs

[Mike Frysinger]

On Sunday, September 12, 2010 15:06:07 Wolfgang Denk wrote:
> Reinhard Meyer wrote:
> > Is there a similar simple trick to produce the 0/n e-Mail? I mean without
> > hand entering Subject and Body into the send-email phase? Like having it
> > in a prepared file?
> 
> Maybe the "--compose" to "git send-email" is what you are looking for:

or --cover-letter
-mike
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[U-Boot] Patches to support Ramtron SPI FRAMs

[Wolfgang Denk]

Dear Reinhard Meyer,

In message <4C8D2729.2080800@emk-elektronik.de> you wrote:
>
> >> Thanks. Way too simple to see the dots through a big redwood board.
> >> (though I'd use HEAD~8..HEAD~7)
> >
> > This would give you only a single patch, representing the commit at
> > HEAD~7
> 
> Thanks for clarifying! Interesting logic, however ;)

In which way "interesting"? A commit represents a state. A patch
represents a change from one state into another one, so it seems
logical to me that you hve to specify the "from commit" and the "to
commit" IDs.

> I had used that one. It just seemed awkward to have a text editor open
> and then to read a file into it...

export EDITOR=/bin/cat  ?  ;-)

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
The world is coming to an end -- save your buffers!

[U-Boot] Patches to support Ramtron SPI FRAMs

[Reinhard Meyer]

Dear Mike Frysinger,
> On Sunday, September 12, 2010 15:06:07 Wolfgang Denk wrote:
>> Reinhard Meyer wrote:
>>> Is there a similar simple trick to produce the 0/n e-Mail? I mean without
>>> hand entering Subject and Body into the send-email phase? Like having it
>>> in a prepared file?
>>
>> Maybe the "--compose" to "git send-email" is what you are looking for:
>
> or --cover-letter

That sounds promising. I'll check that tomorrow. Anyway you might have a
look at the two patches before I resend them tomorrow with proper subjects,
so any comments/wishes might be addressed before I do that.

Reinhard

[U-Boot] [PATCH V4 0/2] Patches to support Ramtron SPI FRAMs

[Reinhard Meyer]

Patch 1 adds generalisation to spi_flash.c to allow for table driven
probing of JEDEC and NON-JEDEC conformant devices

Patch 2 adds the actual Ramtron support

Patch 2 requires Patch 1 to be applied first.

Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>

[U-Boot] [PATCH V4 1/2] MTD/SPI: introduce table driven probing

[Reinhard Meyer]

for JEDEC devices without and with extension bytes
for non JEDEC devices
Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
---
 drivers/mtd/spi/spi_flash.c |  137 +++++++++++++++++++++++++++++--------------
 1 files changed, 93 insertions(+), 44 deletions(-)

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index ea875dc..e19f47d 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -1,8 +1,26 @@
 /*
- * SPI flash interface
+ * (C) Copyright 2010
+ * Reinhard Meyer, EMK Elektronik, reinhard.meyer at emk-elektronik.de
  *
  * Copyright (C) 2008 Atmel Corporation
- * Licensed under the GPL-2 or later.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
  */
 
 #include <common.h>
@@ -96,13 +114,59 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
 	return ret;
 }
 
+/*
+ * the following table holds all device probe functions
+ *
+ * shift:  number of continuation bytes before the ID
+ * idcode: the expected IDCODE or 0xff for non JEDEC devices
+ * probe:  the function to call
+ *
+ * non JEDEC devices should be ordered in the table such that
+ * the probe functions with best detection algorithms come first
+ *
+ * several matching entries are permitted, they will be tried
+ * in sequence until a probe function returns non NULL
+ *
+ * IDBUF_LEN may be redefined if a device detection requires
+ * more then 5 bytes read.
+ */
+#define IDBUF_LEN 5
+const struct {
+	const u8 shift;
+	const u8 idcode;
+	struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
+} flashes[] = {
+#ifdef CONFIG_SPI_FLASH_SPANSION
+	{ 0, 0x01, spi_flash_probe_spansion, },
+#endif
+#ifdef CONFIG_SPI_FLASH_ATMEL
+	{ 0, 0x1F, spi_flash_probe_atmel, },
+#endif
+#ifdef CONFIG_SPI_FLASH_MACRONIX
+	{ 0, 0xc2, spi_flash_probe_macronix, },
+#endif
+#ifdef CONFIG_SPI_FLASH_WINBOND
+	{ 0, 0xef, spi_flash_probe_winbond, },
+#endif
+#ifdef CONFIG_SPI_FLASH_STMICRO
+	{ 0, 0x20, spi_flash_probe_stmicro, },
+	{ 0, 0xff, spi_flash_probe_stmicro, },
+#endif
+#ifdef CONFIG_SPI_FLASH_SST
+	{ 0, 0xBF, spi_flash_probe_sst, },
+#endif
+};
+
 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 		unsigned int max_hz, unsigned int spi_mode)
 {
 	struct spi_slave *spi;
-	struct spi_flash *flash;
+	struct spi_flash *flash = NULL;
 	int ret;
-	u8 idcode[5];
+	int shift;
+	int i;
+	u8 idbuf[IDBUF_LEN];
+	u8 *idp;
 
 	spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
 	if (!spi) {
@@ -117,53 +181,38 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	}
 
 	/* Read the ID codes */
-	ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
+	ret = spi_flash_cmd(spi, CMD_READ_ID, &idbuf, sizeof(idbuf));
 	if (ret)
 		goto err_read_id;
 
-	debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0],
-			idcode[1], idcode[2], idcode[3], idcode[4]);
-
-	switch (idcode[0]) {
-#ifdef CONFIG_SPI_FLASH_SPANSION
-	case 0x01:
-		flash = spi_flash_probe_spansion(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_ATMEL
-	case 0x1F:
-		flash = spi_flash_probe_atmel(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_MACRONIX
-	case 0xc2:
-		flash = spi_flash_probe_macronix(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_WINBOND
-	case 0xef:
-		flash = spi_flash_probe_winbond(spi, idcode);
-		break;
-#endif
-#ifdef CONFIG_SPI_FLASH_STMICRO
-	case 0x20:
-	case 0xff: /* Let the stmicro func handle non-JEDEC ids */
-		flash = spi_flash_probe_stmicro(spi, idcode);
-		break;
+#ifdef DEBUG
+	printf("SF: Got idcodes\n");
+	print_buffer(0, idbuf, 1, sizeof(idbuf), 0);
 #endif
-#ifdef CONFIG_SPI_FLASH_SST
-	case 0xBF:
-		flash = spi_flash_probe_sst(spi, idcode);
-		break;
-#endif
-	default:
-		printf("SF: Unsupported manufacturer %02X\n", idcode[0]);
-		flash = NULL;
-		break;
+
+	/*
+	 * count the number of continuation bytes, but
+	 * leave at least 3 bytes to the end of the buffer untouched
+	 */
+	for (shift = 0, idp = idbuf;
+		shift < (sizeof(idbuf) - 3) && *idp == 0x7f;
+			shift++, idp++)
+		;
+
+	/* search the table for matches in shift and id */
+	for (i = 0; i < ARRAY_SIZE(flashes); i++) {
+		if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
+			/* we have a match, call probe */
+			flash = flashes[i].probe(spi, idp);
+			if (flash)
+				break;
+		}
 	}
 
-	if (!flash)
+	if (!flash) {
+		printf("SF: Unsupported manufacturer %02X\n", *idp);
 		goto err_manufacturer_probe;
+	}
 
 	spi_release_bus(spi);
 
-- 
1.5.6.5

[U-Boot] [PATCH V4 2/2] MTD/SPI: add support for Ramtron FRAMs

[Reinhard Meyer]

JEDEC types
non JEDEC types

Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
---
 drivers/mtd/spi/Makefile             |    1 +
 drivers/mtd/spi/ramtron.c            |  321 ++++++++++++++++++++++++++++++++++
 drivers/mtd/spi/spi_flash.c          |    8 +
 drivers/mtd/spi/spi_flash_internal.h |    1 +
 4 files changed, 331 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mtd/spi/ramtron.c

diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 4f11b36..a082ca7 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -32,6 +32,7 @@ COBJS-$(CONFIG_SPI_FLASH_SPANSION)	+= spansion.o
 COBJS-$(CONFIG_SPI_FLASH_SST)	+= sst.o
 COBJS-$(CONFIG_SPI_FLASH_STMICRO)	+= stmicro.o
 COBJS-$(CONFIG_SPI_FLASH_WINBOND)	+= winbond.o
+COBJS-$(CONFIG_SPI_FRAM_RAMTRON)	+= ramtron.o
 COBJS-$(CONFIG_SPI_M95XXX) += eeprom_m95xxx.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/mtd/spi/ramtron.c b/drivers/mtd/spi/ramtron.c
new file mode 100644
index 0000000..dc4e6a0
--- /dev/null
+++ b/drivers/mtd/spi/ramtron.c
@@ -0,0 +1,321 @@
+/*
+ * (C) Copyright 2010
+ * Reinhard Meyer, EMK Elektronik, reinhard.meyer at emk-elektronik.de
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Note: RAMTRON SPI FRAMs are ferroelectric, nonvolatile RAMs
+ * with an interface identical to SPI flash devices.
+ * However since they behave like RAM there are no delays or
+ * busy polls required. They can sustain read or write at the
+ * allowed SPI bus speed, which can be 40 MHz for some devices.
+ *
+ * Unfortunately some RAMTRON devices do not have a means of
+ * identifying them. They will leave the SO line undriven when
+ * the READ-ID command is issued. It is therefore mandatory
+ * that the MISO line has a proper pull-up, so that READ-ID
+ * will return a row of 0xff. This 0xff pseudo-id will cause
+ * probes by all vendor specific functions that are designed
+ * to handle it. If the MISO line is not pulled up, READ-ID
+ * could return any random noise, even mimicking another
+ * device.
+ *
+ * We use CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+ * to define which device will be assumed after a simple status
+ * register verify. This method is prone to false positive
+ * detection and should therefore be the last to be tried.
+ * Enter it in the last position in the table in spi_flash.c!
+ *
+ * The define CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC both activates
+ * compilation of the special handler and defines the device
+ * to assume.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi_flash.h>
+#include "spi_flash_internal.h"
+
+/* RAMTRON commands common to all devices */
+#define CMD_RAMTRON_WREN	0x06	/* Write Enable */
+#define CMD_RAMTRON_WRDI	0x04	/* Write Disable */
+#define CMD_RAMTRON_RDSR	0x05	/* Read Status Register */
+#define CMD_RAMTRON_WRSR	0x01	/* Write Status Register */
+#define CMD_RAMTRON_READ	0x03	/* Read Data Bytes */
+#define CMD_RAMTRON_WRITE	0x02	/* Write Data Bytes */
+/* not all have those: */
+#define CMD_RAMTRON_FSTRD	0x0b	/* Fast Read (for compatibility - not used here) */
+#define CMD_RAMTRON_SLEEP	0xb9	/* Enter Sleep Mode */
+#define CMD_RAMTRON_RDID	0x9f	/* Read ID */
+#define CMD_RAMTRON_SNR		0xc3	/* Read Serial Number */
+
+/*
+ * Properties of supported FRAMs
+ * Note: speed is currently not used because we have no method to deliver that
+ * value to the upper layers
+ */
+struct ramtron_spi_fram_params {
+	u32	size;		/* size in bytes */
+	u8	addr_len;	/* number of address bytes */
+	u8	merge_cmd;	/* some address bits are in the command byte */
+	u8	id1;		/* device ID 1 (family, density) */
+	u8	id2;		/* device ID 2 (sub, rev, rsvd) */
+	u32	speed;		/* max. SPI clock in Hz */
+	const char *name;	/* name for display and/or matching */
+};
+
+struct ramtron_spi_fram {
+	struct spi_flash flash;
+	const struct ramtron_spi_fram_params *params;
+};
+
+static inline struct ramtron_spi_fram *to_ramtron_spi_fram(struct spi_flash
+							     *flash)
+{
+	return container_of(flash, struct ramtron_spi_fram, flash);
+}
+
+/*
+ * table describing supported FRAM chips:
+ * chips without RDID command must have the values 0xff for id1 and id2
+ */
+static const struct ramtron_spi_fram_params ramtron_spi_fram_table[] = {
+	{
+		.size = 32*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x22,
+		.id2 = 0x00,
+		.speed = 40000000,
+		.name = "FM25V02",
+	},
+	{
+		.size = 32*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x22,
+		.id2 = 0x01,
+		.speed = 40000000,
+		.name = "FM25VN02",
+	},
+	{
+		.size = 64*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x23,
+		.id2 = 0x00,
+		.speed = 40000000,
+		.name = "FM25V05",
+	},
+	{
+		.size = 64*1024,
+		.addr_len = 2,
+		.merge_cmd = 0,
+		.id1 = 0x23,
+		.id2 = 0x01,
+		.speed = 40000000,
+		.name = "FM25VN05",
+	},
+	{
+		.size = 128*1024,
+		.addr_len = 3,
+		.merge_cmd = 0,
+		.id1 = 0x24,
+		.id2 = 0x00,
+		.speed = 40000000,
+		.name = "FM25V10",
+	},
+	{
+		.size = 128*1024,
+		.addr_len = 3,
+		.merge_cmd = 0,
+		.id1 = 0x24,
+		.id2 = 0x01,
+		.speed = 40000000,
+		.name = "FM25VN10",
+	},
+#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	{
+		.size = 256*1024,
+		.addr_len = 3,
+		.merge_cmd = 0,
+		.id1 = 0xff,
+		.id2 = 0xff,
+		.speed = 40000000,
+		.name = "FM25H20",
+	},
+#endif
+};
+
+static int ramtron_common(struct spi_flash *flash,
+		u32 offset, size_t len, void *buf, u8 command)
+{
+	struct ramtron_spi_fram *sn = to_ramtron_spi_fram(flash);
+	u8 cmd[4];
+	int cmd_len;
+	int ret;
+
+	if (sn->params->addr_len == 3 && sn->params->merge_cmd == 0) {
+		cmd[0] = command;
+		cmd[1] = offset >> 16;
+		cmd[2] = offset >> 8;
+		cmd[3] = offset;
+		cmd_len = 4;
+	}
+	else if (sn->params->addr_len == 2 && sn->params->merge_cmd == 0) {
+		cmd[0] = command;
+		cmd[1] = offset >> 8;
+		cmd[2] = offset;
+		cmd_len = 3;
+	}
+	else {
+		printf("SF: unsupported addr_len or merge_cmd\n");
+		return -1;
+	}
+
+	/* claim the bus */
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		debug("SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	if (command == CMD_RAMTRON_WRITE) {
+		/* send WREN */
+		ret = spi_flash_cmd(flash->spi, CMD_RAMTRON_WREN, NULL, 0);
+		if (ret < 0) {
+			debug("SF: Enabling Write failed\n");
+			goto releasebus;
+		}
+	}
+
+	/* do the transaction */
+	if (command == CMD_RAMTRON_WRITE)
+		ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len, buf, len);
+	else
+		ret = spi_flash_cmd_read(flash->spi, cmd, cmd_len, buf, len);
+	if (ret < 0)
+		debug("SF: Transaction failed\n");
+
+releasebus:
+	/* release the bus */
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+static int ramtron_read(struct spi_flash *flash,
+		u32 offset, size_t len, void *buf)
+{
+	return ramtron_common(flash, offset, len, buf,
+		CMD_RAMTRON_READ);
+}
+
+static int ramtron_write(struct spi_flash *flash,
+		u32 offset, size_t len, const void *buf)
+{
+	return ramtron_common(flash, offset, len, (void *)buf,
+		CMD_RAMTRON_WRITE);
+}
+
+int ramtron_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+	debug("SF: Erase of RAMTRON FRAMs is pointless\n");
+	return -1;
+}
+
+/*
+ * nore: we are called here with idcode pointing to the first non-0x7f byte
+ * already!
+ */
+struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, u8 *idcode)
+{
+	const struct ramtron_spi_fram_params *params;
+	struct ramtron_spi_fram *sn;
+	unsigned int i;
+#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	int ret;
+	u8 sr;
+#endif
+
+	/* NOTE: the bus has been claimed before this function is called! */
+	switch (idcode[0]) {
+	case 0xc2:
+		/* JEDEC conformant RAMTRON id */
+		for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) {
+			params = &ramtron_spi_fram_table[i];
+			if (idcode[1] == params->id1 && idcode[2] == params->id2)
+				goto found;
+		}
+		break;
+#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	case 0xff:
+		/*
+		 * probably open MISO line, pulled up.
+		 * We COULD have a non JEDEC conformant FRAM here,
+		 * read the status register to verify
+		 */
+		ret = spi_flash_cmd(spi, CMD_RAMTRON_RDSR, &sr, 1);
+		if (ret)
+			return NULL;
+
+		/* Bits 5,4,0 are fixed 0 for all devices */
+		if ((sr & 0x31) != 0x00)
+			return NULL;
+		/* now find the device */
+		for (i = 0; i < ARRAY_SIZE(ramtron_spi_fram_table); i++) {
+			params = &ramtron_spi_fram_table[i];
+			if (!strcmp(params->name, CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC))
+				goto found;
+		}
+		debug("SF: Unsupported non-JEDEC RAMTRON device "
+			CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC "\n");
+		break;
+#endif
+	default:
+		break;
+	}
+
+	/* arriving here means no method has found a device we can handle */
+	debug("SF/ramtron: unsupported device id0=%02x id1=%02x id2=%02x\n",
+		idcode[0], idcode[1], idcode[2]);
+	return NULL;
+
+found:
+	sn = malloc(sizeof(struct ramtron_spi_fram));
+	if (!sn) {
+		debug("SF: Failed to allocate memory\n");
+		return NULL;
+	}
+
+	sn->params = params;
+	sn->flash.spi = spi;
+	sn->flash.name = params->name;
+
+	sn->flash.write = ramtron_write;
+	sn->flash.read = ramtron_read;
+	sn->flash.erase = ramtron_erase;
+	sn->flash.size = params->size;
+
+	printf("SF: Detected %s with size ", params->name);
+	print_size(sn->flash.size, "\n");
+
+	return &sn->flash;
+}
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index e19f47d..3f8c8e1 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -155,6 +155,14 @@ const struct {
 #ifdef CONFIG_SPI_FLASH_SST
 	{ 0, 0xBF, spi_flash_probe_sst, },
 #endif
+#ifdef CONFIG_SPI_FRAM_RAMTRON
+	{ 6, 0xc2, spi_fram_probe_ramtron, },
+# ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
+	{ 0, 0xff, spi_fram_probe_ramtron, },
+# endif
+# undef IDBUF_LEN
+# define IDBUF_LEN 9 /* we need to read 6+3 bytes */
+#endif
 };
 
 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index 08546fb..9bc43dd 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -50,3 +50,4 @@ struct spi_flash *spi_flash_probe_macronix(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode);
+struct spi_flash *spi_fram_probe_ramtron(struct spi_slave *spi, u8 *idcode);
-- 
1.5.6.5

[U-Boot] [PATCH V4 1/2] MTD/SPI: introduce table driven probing

[Mike Frysinger]

On Tuesday, September 14, 2010 10:50:08 Reinhard Meyer wrote:
> for JEDEC devices without and with extension bytes
> for non JEDEC devices
> Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>

needs to be a blank line before s-o-b tags and friends

> - * Licensed under the GPL-2 or later.

this is unnecessary noise.  drop this hunk.

> +	/*
> +	 * count the number of continuation bytes, but
> +	 * leave at least 3 bytes to the end of the buffer untouched
> +	 */
> +	for (shift = 0, idp = idbuf;
> +		shift < (sizeof(idbuf) - 3) && *idp == 0x7f;
> +			shift++, idp++)
> +		;

is the offset of 3 necessary ?  seems a little fragile ...
-mike
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[U-Boot] [PATCH V4 2/2] MTD/SPI: add support for Ramtron FRAMs

[Mike Frysinger]

On Tuesday, September 14, 2010 10:50:09 Reinhard Meyer wrote:
> JEDEC types
> non JEDEC types

this changelog is useless ... either make it say something, or just leave it 
empty

> +static int ramtron_common(struct spi_flash *flash,
> +		u32 offset, size_t len, void *buf, u8 command)
> +{
> +
> +	if (sn->params->addr_len == 3 && sn->params->merge_cmd == 0) {
> +		cmd[0] = command;
> +		cmd[1] = offset >> 16;
> +		cmd[2] = offset >> 8;
> +		cmd[3] = offset;
> +		cmd_len = 4;
> +	}
> +	else if (sn->params->addr_len == 2 && sn->params->merge_cmd == 0) {
> +		cmd[0] = command;
> +		cmd[1] = offset >> 8;
> +		cmd[2] = offset;
> +		cmd_len = 3;
> +	}
> +	else {

i thought i had mentioned this before, but those else statements need cuddling

> +	/* claim the bus */
> +	ret = spi_claim_bus(flash->spi);
> +	if (ret) {
> +		debug("SF: Unable to claim SPI bus\n");
> +		return ret;
> +	}

i'm thinking we should push the bus claim from the read/write funcs into the 
common spi flash layer ... not that this is specific to your flash.  we can do 
this after yours gets merged.

> +	sn = malloc(sizeof(struct ramtron_spi_fram));

sizeof(*sn)

otherwise, this looks good
-mike
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[U-Boot] [PATCH V4 1/2] MTD/SPI: introduce table driven probing

[Reinhard Meyer]

On 14.09.2010 16:53, Mike Frysinger wrote:
> On Tuesday, September 14, 2010 10:50:08 Reinhard Meyer wrote:
>> for JEDEC devices without and with extension bytes
>> for non JEDEC devices
>> Signed-off-by: Reinhard Meyer<u-boot@emk-elektronik.de>
>
> needs to be a blank line before s-o-b tags and friends
>
>> - * Licensed under the GPL-2 or later.
>
> this is unnecessary noise.  drop this hunk.

Drop what? The removal?

>
>> +	/*
>> +	 * count the number of continuation bytes, but
>> +	 * leave at least 3 bytes to the end of the buffer untouched
>> +	 */
>> +	for (shift = 0, idp = idbuf;
>> +		shift<  (sizeof(idbuf) - 3)&&  *idp == 0x7f;
>> +			shift++, idp++)
>> +		;
>
> is the offset of 3 necessary ?  seems a little fragile ...

Any JEDEC device seems to have at least 3 bytes of ID. Unless we start passing
the length of the remainder of idbuf we need to make sure the probe function
can safely access 3 bytes.

Reinhard

[U-Boot] [PATCH V4 1/2] MTD/SPI: introduce table driven probing

[Mike Frysinger]

On Tuesday, September 14, 2010 14:29:30 Reinhard Meyer wrote:
> On 14.09.2010 16:53, Mike Frysinger wrote:
> > On Tuesday, September 14, 2010 10:50:08 Reinhard Meyer wrote:
> >> for JEDEC devices without and with extension bytes
> >> for non JEDEC devices
> >> Signed-off-by: Reinhard Meyer<u-boot@emk-elektronik.de>
> > 
> > needs to be a blank line before s-o-b tags and friends
> > 
> >> - * Licensed under the GPL-2 or later.
> > 
> > this is unnecessary noise.  drop this hunk.
> 
> Drop what? The removal?

the whole license change.  leave it the way it is.

> >> +	/*
> >> +	 * count the number of continuation bytes, but
> >> +	 * leave at least 3 bytes to the end of the buffer untouched
> >> +	 */
> >> +	for (shift = 0, idp = idbuf;
> >> +		shift<  (sizeof(idbuf) - 3)&&  *idp == 0x7f;
> >> +			shift++, idp++)
> >> +		;
> > 
> > is the offset of 3 necessary ?  seems a little fragile ...
> 
> Any JEDEC device seems to have at least 3 bytes of ID. Unless we start
> passing the length of the remainder of idbuf we need to make sure the
> probe function can safely access 3 bytes.

considering we've pre-screened the length and known devices, i dont think this 
will be a problem.  i guess just extend the comment above it a little 
explaining the 3 byte logic.
-mike
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[U-Boot] [PATCH V4 2/2] MTD/SPI: add support for Ramtron FRAMs

[Reinhard Meyer]

Dear Mike Frysinger, All:)
> On Tuesday, September 14, 2010 10:50:09 Reinhard Meyer wrote:
>> JEDEC types
>> non JEDEC types
> 
> this changelog is useless ... either make it say something, or just leave it 
> empty
> 
>> +static int ramtron_common(struct spi_flash *flash,
>> +		u32 offset, size_t len, void *buf, u8 command)
>> +{
>> +
>> +	if (sn->params->addr_len == 3 && sn->params->merge_cmd == 0) {
>> +		cmd[0] = command;
>> +		cmd[1] = offset >> 16;
>> +		cmd[2] = offset >> 8;
>> +		cmd[3] = offset;
>> +		cmd_len = 4;
>> +	}
>> +	else if (sn->params->addr_len == 2 && sn->params->merge_cmd == 0) {
>> +		cmd[0] = command;
>> +		cmd[1] = offset >> 8;
>> +		cmd[2] = offset;
>> +		cmd_len = 3;
>> +	}
>> +	else {
> 
> i thought i had mentioned this before, but those else statements need cuddling
> 
>> +	/* claim the bus */
>> +	ret = spi_claim_bus(flash->spi);
>> +	if (ret) {
>> +		debug("SF: Unable to claim SPI bus\n");
>> +		return ret;
>> +	}
> 
> i'm thinking we should push the bus claim from the read/write funcs into the 
> common spi flash layer ... not that this is specific to your flash.  we can do 
> this after yours gets merged.
> 
>> +	sn = malloc(sizeof(struct ramtron_spi_fram));
> 
> sizeof(*sn)
> 
> otherwise, this looks good
> -mike

I am unsure whether currently I should put further effort into this, because this
won't work on architectures with incomplete relocation. The pointers in the
"probe" table would need relocation fixups otherwise.

Reinhard
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[U-Boot] [PATCH V4 2/2] MTD/SPI: add support for Ramtron FRAMs

[Wolfgang Denk]

Dear Reinhard Meyer,

In message <4CA974B5.8030905@emk-elektronik.de> you wrote:
>
> I am unsure whether currently I should put further effort into this, because this
> won't work on architectures with incomplete relocation. The pointers in the
> "probe" table would need relocation fixups otherwise.

The relocation problems will be fixed one way or another. We must find
a solution for this problem, so please go on...

Best regards,

Wolfgang Denk

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