spi: Pass pointer to spi_slave structure in spi_setup_slave

For spi_setup_slave, instead of making the platform driver return a
pointer to spi_slave structure, pass in a structure pointer that can be
filled in by the driver as required. This removes the need for platform
drivers to maintain a slave structure in data/CAR section.

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully

Change-Id: Ia15a4f88ef4dcfdf616bb1c22261e7cb642a7573
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17683
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

2 files changed, 17 insertions, 11 deletions

diff --git a/src/drivers/spi/tpm/tis.c b/src/drivers/spi/tpm/tis.c
index 055525b1c6..d3c727cb27 100644
--- a/src/drivers/spi/tpm/tis.c
+++ b/src/drivers/spi/tpm/tis.c
@@ -58,10 +58,16 @@ int tis_close(void)
 
 int tis_init(void)
 {
+	struct spi_slave spi;
 	struct tpm2_info info;
 
-	if (tpm2_init(spi_setup_slave(CONFIG_DRIVER_TPM_SPI_BUS,
-				      CONFIG_DRIVER_TPM_SPI_CHIP))) {
+	if (spi_setup_slave(CONFIG_DRIVER_TPM_SPI_BUS,
+			    CONFIG_DRIVER_TPM_SPI_CHIP, &spi)) {
+		printk(BIOS_ERR, "Failed to setup TPM SPI slave\n");
+		return -1;
+	}
+
+	if (tpm2_init(&spi)) {
 		printk(BIOS_ERR, "Failed to initialize TPM SPI interface\n");
 		return -1;
 	}
diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c
index d364cb958a..5abfc4558f 100644
--- a/src/drivers/spi/tpm/tpm.c
+++ b/src/drivers/spi/tpm/tpm.c
@@ -36,7 +36,7 @@
 
 /* SPI Interface descriptor used by the driver. */
 struct tpm_spi_if {
-	struct spi_slave *slave;
+	struct spi_slave slave;
 	int (*cs_assert)(const struct spi_slave *slave);
 	void (*cs_deassert)(const struct spi_slave *slave);
 	int  (*xfer)(const struct spi_slave *slave, const void *dout,
@@ -130,7 +130,7 @@ static void start_transaction(int read_write, size_t bytes, unsigned addr)
 		header.body[i + 1] = (addr >> (8 * (2 - i))) & 0xff;
 
 	/* CS assert wakes up the slave. */
-	tpm_if.cs_assert(tpm_if.slave);
+	tpm_if.cs_assert(&tpm_if.slave);
 
 	/*
 	 * The TCG TPM over SPI specification introduces the notion of SPI
@@ -157,11 +157,11 @@ static void start_transaction(int read_write, size_t bytes, unsigned addr)
 	 * to require to stall the master, this would present an issue.
 	 * crosbug.com/p/52132 has been opened to track this.
 	 */
-	tpm_if.xfer(tpm_if.slave, header.body, sizeof(header.body), NULL, 0);
+	tpm_if.xfer(&tpm_if.slave, header.body, sizeof(header.body), NULL, 0);
 
 	/* Now poll the bus until TPM removes the stall bit. */
 	do {
-		tpm_if.xfer(tpm_if.slave, NULL, 0, &byte, 1);
+		tpm_if.xfer(&tpm_if.slave, NULL, 0, &byte, 1);
 	} while (!(byte & 1));
 }
 
@@ -227,7 +227,7 @@ static void trace_dump(const char *prefix, uint32_t reg,
  */
 static void write_bytes(const void *buffer, size_t bytes)
 {
-	tpm_if.xfer(tpm_if.slave, buffer, bytes, NULL, 0);
+	tpm_if.xfer(&tpm_if.slave, buffer, bytes, NULL, 0);
 }
 
 /*
@@ -236,7 +236,7 @@ static void write_bytes(const void *buffer, size_t bytes)
  */
 static void read_bytes(void *buffer, size_t bytes)
 {
-	tpm_if.xfer(tpm_if.slave, NULL, 0, buffer, bytes);
+	tpm_if.xfer(&tpm_if.slave, NULL, 0, buffer, bytes);
 }
 
 /*
@@ -251,7 +251,7 @@ static int tpm2_write_reg(unsigned reg_number, const void *buffer, size_t bytes)
 	trace_dump("W", reg_number, bytes, buffer, 0);
 	start_transaction(false, bytes, reg_number);
 	write_bytes(buffer, bytes);
-	tpm_if.cs_deassert(tpm_if.slave);
+	tpm_if.cs_deassert(&tpm_if.slave);
 	return 1;
 }
 
@@ -266,7 +266,7 @@ static int tpm2_read_reg(unsigned reg_number, void *buffer, size_t bytes)
 {
 	start_transaction(true, bytes, reg_number);
 	read_bytes(buffer, bytes);
-	tpm_if.cs_deassert(tpm_if.slave);
+	tpm_if.cs_deassert(&tpm_if.slave);
 	trace_dump("R", reg_number, bytes, buffer, 0);
 	return 1;
 }
@@ -303,7 +303,7 @@ int tpm2_init(struct spi_slave *spi_if)
 	uint32_t did_vid, status;
 	uint8_t cmd;
 
-	tpm_if.slave = spi_if;
+	memcpy(&tpm_if.slave, spi_if, sizeof(*spi_if));
 
 	tpm2_read_reg(TPM_DID_VID_REG, &did_vid, sizeof(did_vid));