SPI: Fix and enable Fast Read support

- Fix handling of 5-byte Fast Read command in the ICH SPI
driver.  This fix is ported from the U-boot driver.
- Allow CONFIG_SPI_FLASH_NO_FAST_READ to be overridden by
defining a name for the bool in Kconfig and removing the
forced select in southbridge config
- Fix use of CONFIG_SPI_FLASH_NO_FAST_READ in SPI drivers
to use #if instead of #ifdef
- Relocate flash functions in SMM so they are usable.
This really only needs to happen for read function pointer
since it uses a global function rather than a static one from
the chip, but it is good to ensure the rest are set up
correctly as well.

Change-Id: Ic1bb0764cb111f96dd8a389d83b39fe8f5e72fbd
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1775
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/drivers/spi/Kconfig

@@ -80,7 +80,7 @@ config SPI_FLASH_WINBOND
 	  data in the SPI flash and your SPI flash is made by Winbond.
 
 config SPI_FLASH_NO_FAST_READ
-	bool
+	bool "Disable Fast Read command"
 	default n
 	depends on SPI_FLASH
 	help

src/drivers/spi/gigadevice.c

@@ -154,7 +154,7 @@ static int gigadevice_write(struct spi_flash *flash, u32 offset,
 		cmd[3] = offset & 0xff;
 #if CONFIG_DEBUG_SPI_FLASH
 		printk(BIOS_SPEW,
-		       "PP gigadevice.c: %#p => cmd = { %#02x %#02x%02x%02x }"
+		       "PP gigadevice.c: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }"
 		       " chunk_len = %zu\n", buf + actual,
 		       cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 #endif
@@ -226,7 +226,7 @@ struct spi_flash *spi_flash_probe_gigadevice(struct spi_slave *spi, u8 *idcode)
 
 	stm->flash.write = gigadevice_write;
 	stm->flash.erase = gigadevice_erase;
-#ifdef CONFIG_SPI_FLASH_NO_FAST_READ
+#if CONFIG_SPI_FLASH_NO_FAST_READ
 	stm->flash.read = spi_flash_cmd_read_slow;
 #else
 	stm->flash.read = spi_flash_cmd_read_fast;

src/drivers/spi/macronix.c

@@ -210,7 +210,7 @@ struct spi_flash *spi_flash_probe_macronix(struct spi_slave *spi, u8 *idcode)
 
 	mcx->flash.write = macronix_write;
 	mcx->flash.erase = macronix_erase;
-#ifdef CONFIG_SPI_FLASH_NO_FAST_READ
+#if CONFIG_SPI_FLASH_NO_FAST_READ
 	mcx->flash.read = spi_flash_cmd_read_slow;
 #else
 	mcx->flash.read = spi_flash_cmd_read_fast;

src/drivers/spi/spi_flash.c

@@ -281,7 +281,7 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	/* 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) {
-#ifdef __SMM__
+#if CONFIG_SMM_TSEG && defined(__SMM__)
 			/* Need to relocate this function */
 			tseg_relocate((void **)&flashes[i].probe);
 #endif
@@ -296,6 +296,14 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 		goto err_manufacturer_probe;
 	}
 
+#if CONFIG_SMM_TSEG && defined(__SMM__)
+	/* Ensure flash handlers are valid for TSEG */
+	tseg_relocate((void **)&flash->read);
+	tseg_relocate((void **)&flash->write);
+	tseg_relocate((void **)&flash->erase);
+	tseg_relocate((void **)&flash->name);
+#endif
+
 	printk(BIOS_INFO, "SF: Detected %s with page size %x, total %x\n",
 			flash->name, flash->sector_size, flash->size);
 

src/drivers/spi/winbond.c

@@ -205,7 +205,7 @@ struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode)
 
 	stm->flash.write = winbond_write;
 	stm->flash.erase = winbond_erase;
-#ifdef CONFIG_SPI_FLASH_NO_FAST_READ
+#if CONFIG_SPI_FLASH_NO_FAST_READ
 	stm->flash.read = spi_flash_cmd_read_slow;
 #else
 	stm->flash.read = spi_flash_cmd_read_fast;

src/include/spi.h

@@ -46,6 +46,7 @@
 
 /* SPI opcodes */
 #define SPI_OPCODE_WREN 0x06
+#define SPI_OPCODE_FAST_READ 0x0b
 
 /*-----------------------------------------------------------------------
  * Representation of a SPI slave, i.e. what we're communicating with.

src/southbridge/intel/bd82x6x/Kconfig

@@ -34,7 +34,6 @@ config SOUTH_BRIDGE_OPTIONS # dummy
 	select PCIEXP_ASPM
 	select PCIEXP_COMMON_CLOCK
 	select SPI_FLASH
-	select SPI_FLASH_NO_FAST_READ
 
 config EHCI_BAR
 	hex

src/southbridge/intel/bd82x6x/spi.c

@@ -484,6 +484,12 @@ static void spi_setup_type(spi_transaction *trans)
 	if (trans->bytesout == 4) { /* and bytesin is > 0 */
 		trans->type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
 	}
+
+	/* Fast read command is called with 5 bytes instead of 4 */
+	if (trans->out[0] == SPI_OPCODE_FAST_READ && trans->bytesout == 5) {
+		trans->type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
+		--trans->bytesout;
+	}
 }
 
 static int spi_setup_opcode(spi_transaction *trans)