SPI: Split writes using spi_crop_chunk()

SPI controllers in Intel and AMD bridges have a slightly different
restriction on how long transactions they can handle.

Change-Id: I3d149d4b7e7e9633482a153d5e380a86c553d871
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6163
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/drivers/spi/adesto.c

@@ -100,7 +100,7 @@ static int adesto_write(struct spi_flash *flash,
 
 	for (actual = 0; actual < len; actual += chunk_len) {
 		chunk_len = min(len - actual, page_size - byte_addr);
-		chunk_len = min(chunk_len, CONTROLLER_PAGE_LIMIT);
+		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);
 
 		cmd[0] = CMD_AT25DF_PP;
 		cmd[1] = (offset >> 16) & 0xff;
@@ -118,7 +118,7 @@ static int adesto_write(struct spi_flash *flash,
 			goto out;
 		}
 
-		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
 				buf + actual, chunk_len);
 		if (ret < 0) {
 			printk(BIOS_WARNING, "SF: adesto Page Program failed\n");

src/drivers/spi/amic.c

@@ -82,7 +82,7 @@ static int amic_write(struct spi_flash *flash,
 
 	for (actual = 0; actual < len; actual += chunk_len) {
 		chunk_len = min(len - actual, page_size - byte_addr);
-		chunk_len = min(chunk_len, CONTROLLER_PAGE_LIMIT);
+		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);
 
 		cmd[0] = CMD_A25_PP;
 		cmd[1] = (offset >> 16) & 0xff;
@@ -100,7 +100,7 @@ static int amic_write(struct spi_flash *flash,
 			goto out;
 		}
 
-		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
 				buf + actual, chunk_len);
 		if (ret < 0) {
 			printk(BIOS_WARNING, "SF: AMIC Page Program failed\n");

src/drivers/spi/gigadevice.c

@@ -141,7 +141,7 @@ static int gigadevice_write(struct spi_flash *flash, u32 offset,
 
 	for (actual = 0; actual < len; actual += chunk_len) {
 		chunk_len = min(len - actual, page_size - byte_addr);
-		chunk_len = min(chunk_len, CONTROLLER_PAGE_LIMIT);
+		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);
 
 		ret = spi_flash_cmd(flash->spi, CMD_GD25_WREN, NULL, 0);
 		if (ret < 0) {
@@ -161,7 +161,7 @@ static int gigadevice_write(struct spi_flash *flash, u32 offset,
 		       cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 #endif
 
-		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
 					  buf + actual, chunk_len);
 		if (ret < 0) {
 			printk(BIOS_WARNING,

src/drivers/spi/macronix.c

@@ -144,13 +144,12 @@ static int macronix_write(struct spi_flash *flash,
 	ret = 0;
 	for (actual = 0; actual < len; actual += chunk_len) {
 		chunk_len = min(len - actual, page_size - byte_addr);
-		chunk_len = min(chunk_len, CONTROLLER_PAGE_LIMIT);
+		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);
 
 		cmd[0] = CMD_MX25XX_PP;
 		cmd[1] = (offset >> 16) & 0xff;
 		cmd[2] = (offset >> 8) & 0xff;
 		cmd[3] = offset & 0xff;
-
 #if CONFIG_DEBUG_SPI_FLASH
 		printk(BIOS_SPEW, "PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }"
 		     " chunk_len = %zu\n",
@@ -163,7 +162,7 @@ static int macronix_write(struct spi_flash *flash,
 			break;
 		}
 
-		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
 					  buf + actual, chunk_len);
 		if (ret < 0) {
 			printk(BIOS_WARNING, "SF: Macronix Page Program failed\n");

src/drivers/spi/stmicro.c

@@ -155,7 +155,7 @@ static int stmicro_write(struct spi_flash *flash,
 
 	for (actual = 0; actual < len; actual += chunk_len) {
 		chunk_len = min(len - actual, page_size - byte_addr);
-		chunk_len = min(chunk_len, CONTROLLER_PAGE_LIMIT);
+		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);
 
 		cmd[0] = CMD_M25PXX_PP;
 		cmd[1] = (offset >> 16) & 0xff;
@@ -173,7 +173,7 @@ static int stmicro_write(struct spi_flash *flash,
 			goto out;
 		}
 
-		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
 					  buf + actual, chunk_len);
 		if (ret < 0) {
 			printk(BIOS_WARNING, "SF: STMicro Page Program failed\n");

src/drivers/spi/winbond.c

@@ -134,7 +134,7 @@ static int winbond_write(struct spi_flash *flash,
 
 	for (actual = 0; actual < len; actual += chunk_len) {
 		chunk_len = min(len - actual, page_size - byte_addr);
-		chunk_len = min(chunk_len, CONTROLLER_PAGE_LIMIT);
+		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);
 
 		cmd[0] = CMD_W25_PP;
 		cmd[1] = (offset >> 16) & 0xff;
@@ -152,7 +152,7 @@ static int winbond_write(struct spi_flash *flash,
 			goto out;
 		}
 
-		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
 				buf + actual, chunk_len);
 		if (ret < 0) {
 			printk(BIOS_WARNING, "SF: Winbond Page Program failed\n");

src/include/spi-generic.h

@@ -168,6 +168,8 @@ void spi_cs_deactivate(struct spi_slave *slave);
  */
 void spi_set_speed(struct spi_slave *slave, uint32_t hz);
 
+unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len);
+
 /*-----------------------------------------------------------------------
  * Write 8 bits, then read 8 bits.
  *   slave:	The SPI slave we're communicating with

src/include/spi_flash.h

@@ -39,14 +39,6 @@
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
 
-#define CONFIG_ICH_SPI
-#ifdef CONFIG_ICH_SPI
-#define CONTROLLER_PAGE_LIMIT	64
-#else
-/* any number larger than 4K would do, actually */
-#define CONTROLLER_PAGE_LIMIT	((int)(~0U>>1))
-#endif
-
 struct spi_flash {
 	struct spi_slave *spi;
 

src/soc/intel/baytrail/spi.c

@@ -499,6 +499,11 @@ static int ich_status_poll(u16 bitmask, int wait_til_set)
 	return -1;
 }
 
+unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
+{
+	return min(cntlr.databytes, buf_len);
+}
+
 int spi_xfer(struct spi_slave *slave, const void *dout,
 		unsigned int bytesout, void *din, unsigned int bytesin)
 {
@@ -588,7 +593,7 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
 	 */
 	if (trans.bytesout > cntlr.databytes) {
 		printk(BIOS_DEBUG, "ICH SPI: Too much to write. Does your SPI chip driver use"
-		     " CONTROLLER_PAGE_LIMIT?\n");
+		     " spi_crop_chunk()?\n");
 		return -1;
 	}
 

src/soc/intel/fsp_baytrail/spi.c

@@ -497,6 +497,11 @@ static int ich_status_poll(u16 bitmask, int wait_til_set)
 	return -1;
 }
 
+unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
+{
+	return min(cntlr.databytes, buf_len);
+}
+
 int spi_xfer(struct spi_slave *slave, const void *dout,
 		unsigned int bytesout, void *din, unsigned int bytesin)
 {
@@ -585,7 +590,7 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
 	 */
 	if (trans.bytesout > cntlr.databytes) {
 		printk(BIOS_DEBUG, "ICH SPI: Too much to write. Does your SPI chip driver use"
-		     " CONTROLLER_PAGE_LIMIT?\n");
+		     " spi_crop_chunk()?\n");
 		return -1;
 	}
 

src/southbridge/amd/agesa/hudson/spi.c

@@ -42,6 +42,7 @@ static int bus_claimed = 0;
 #define SPI_REG_CNTRL11		0xd
  #define CNTRL11_FIFOPTR_MASK	0x07
 
+#define AMD_SB_SPI_TX_LEN	64
 
 static u32 spibar;
 
@@ -86,6 +87,11 @@ void spi_init(void)
 	spibar = pci_read_config32(dev, 0xA0) & ~0x1F;
 }
 
+unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
+{
+	return min(AMD_SB_SPI_TX_LEN - cmd_len, buf_len);
+}
+
 int spi_xfer(struct spi_slave *slave, const void *dout,
 		unsigned int bytesout, void *din, unsigned int bytesin)
 {

src/southbridge/amd/cimx/sb800/spi.c

@@ -32,6 +32,8 @@
 static int bus_claimed = 0;
 #endif
 
+#define AMD_SB_SPI_TX_LEN	8
+
 static u32 spibar;
 
 static void reset_internal_fifo_pointer(void)
@@ -56,6 +58,11 @@ void spi_init()
 	spibar = pci_read_config32(dev, 0xA0) & ~0x1F;
 }
 
+unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
+{
+	return min(AMD_SB_SPI_TX_LEN - cmd_len, buf_len);
+}
+
 int spi_xfer(struct spi_slave *slave, const void *dout,
 		unsigned int bytesout, void *din, unsigned int bytesin)
 {

src/southbridge/intel/common/spi.c

@@ -550,6 +550,11 @@ static int spi_is_multichip (void)
 	return !!((cntlr.flmap0 >> 8) & 3);
 }
 
+unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
+{
+	return min(cntlr.databytes, buf_len);
+}
+
 int spi_xfer(struct spi_slave *slave, const void *dout,
 		unsigned int bytesout, void *din, unsigned int bytesin)
 {
@@ -639,7 +644,7 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
 	 */
 	if (trans.bytesout > cntlr.databytes) {
 		printk(BIOS_DEBUG, "ICH SPI: Too much to write. Does your SPI chip driver use"
-		     " CONTROLLER_PAGE_LIMIT?\n");
+		     " spi_crop_chunk()?\n");
 		return -1;
 	}