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>

7 files changed, 16 insertions, 67 deletions

diff --git a/src/soc/intel/apollolake/spi.c b/src/soc/intel/apollolake/spi.c
index 6e873f45c8..ca56702dcf 100644
--- a/src/soc/intel/apollolake/spi.c
+++ b/src/soc/intel/apollolake/spi.c
@@ -344,7 +344,6 @@ static int nuclear_spi_status(const struct spi_flash *flash, uint8_t *reg)
 	return ret;
 }
 
-static struct spi_slave boot_spi CAR_GLOBAL;
 static struct spi_flash boot_flash CAR_GLOBAL;
 
 /*
@@ -391,20 +390,18 @@ struct spi_flash *spi_flash_programmer_probe(struct spi_slave *spi, int force)
 	return flash;
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
 	BOILERPLATE_CREATE_CTX(ctx);
 
 	/* This is special hardware. We expect bus 0 and CS line 0 here. */
 	if ((bus != 0) || (cs != 0))
-		return NULL;
-
-	struct spi_slave *slave = car_get_var_ptr(&boot_spi);
+		return -1;
 
 	slave->bus = bus;
 	slave->cs = cs;
 
-	return slave;
+	return 0;
 }
 
 int spi_read_status(uint8_t *status)
diff --git a/src/soc/intel/baytrail/spi.c b/src/soc/intel/baytrail/spi.c
index 13f88067eb..b4f95aa832 100644
--- a/src/soc/intel/baytrail/spi.c
+++ b/src/soc/intel/baytrail/spi.c
@@ -260,20 +260,11 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
-	ich_spi_slave *slave = malloc(sizeof(*slave));
-
-	if (!slave) {
-		printk(BIOS_DEBUG, "ICH SPI: Bad allocation\n");
-		return NULL;
-	}
-
-	memset(slave, 0, sizeof(*slave));
-
 	slave->bus = bus;
 	slave->cs = cs;
-	return slave;
+	return 0;
 }
 
 static ich9_spi_regs *spi_regs(void)
diff --git a/src/soc/intel/braswell/spi.c b/src/soc/intel/braswell/spi.c
index 34e031b1cd..4236e6ff50 100644
--- a/src/soc/intel/braswell/spi.c
+++ b/src/soc/intel/braswell/spi.c
@@ -229,20 +229,11 @@ static void read_reg(void *src, void *value, uint32_t size)
 	}
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
-	ich_spi_slave *slave = malloc(sizeof(*slave));
-
-	if (!slave) {
-		printk(BIOS_ERR, "ICH SPI: Bad allocation\n");
-		return NULL;
-	}
-
-	memset(slave, 0, sizeof(*slave));
-
 	slave->bus = bus;
 	slave->cs = cs;
-	return slave;
+	return 0;
 }
 
 static ich9_spi_regs *spi_regs(void)
diff --git a/src/soc/intel/broadwell/spi.c b/src/soc/intel/broadwell/spi.c
index 6aa7dd33a8..5220970532 100644
--- a/src/soc/intel/broadwell/spi.c
+++ b/src/soc/intel/broadwell/spi.c
@@ -259,20 +259,11 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
-	ich_spi_slave *slave = malloc(sizeof(*slave));
-
-	if (!slave) {
-		printk(BIOS_DEBUG, "ICH SPI: Bad allocation\n");
-		return NULL;
-	}
-
-	memset(slave, 0, sizeof(*slave));
-
 	slave->bus = bus;
 	slave->cs = cs;
-	return slave;
+	return 0;
 }
 
 void spi_init(void)
diff --git a/src/soc/intel/fsp_baytrail/spi.c b/src/soc/intel/fsp_baytrail/spi.c
index 232366c63b..06b160c8b5 100644
--- a/src/soc/intel/fsp_baytrail/spi.c
+++ b/src/soc/intel/fsp_baytrail/spi.c
@@ -249,20 +249,11 @@ static void read_reg(const void *src, void *value, uint32_t size)
 	}
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
-	ich_spi_slave *slave = malloc(sizeof(*slave));
-
-	if (!slave) {
-		printk(BIOS_DEBUG, "ICH SPI: Bad allocation\n");
-		return NULL;
-	}
-
-	memset(slave, 0, sizeof(*slave));
-
 	slave->bus = bus;
 	slave->cs = cs;
-	return slave;
+	return 0;
 }
 
 static ich9_spi_regs *spi_regs(void)
diff --git a/src/soc/intel/fsp_broadwell_de/spi.c b/src/soc/intel/fsp_broadwell_de/spi.c
index c38fbce7b7..8af56860fa 100644
--- a/src/soc/intel/fsp_broadwell_de/spi.c
+++ b/src/soc/intel/fsp_broadwell_de/spi.c
@@ -259,20 +259,11 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave * slave)
 {
-	ich_spi_slave *slave = malloc(sizeof(*slave));
-
-	if (!slave) {
-		printk(BIOS_DEBUG, "ICH SPI: Bad allocation\n");
-		return NULL;
-	}
-
-	memset(slave, 0, sizeof(*slave));
-
 	slave->bus = bus;
 	slave->cs = cs;
-	return slave;
+	return 0;
 }
 
 void spi_init(void)
diff --git a/src/soc/intel/skylake/flash_controller.c b/src/soc/intel/skylake/flash_controller.c
index 8aee796218..734d9d3532 100644
--- a/src/soc/intel/skylake/flash_controller.c
+++ b/src/soc/intel/skylake/flash_controller.c
@@ -342,7 +342,6 @@ int pch_hwseq_read_status(const struct spi_flash *flash, u8 *reg)
 	return 0;
 }
 
-static struct spi_slave boot_spi CAR_GLOBAL;
 static struct spi_flash boot_flash CAR_GLOBAL;
 
 struct spi_flash *spi_flash_programmer_probe(struct spi_slave *spi, int force)
@@ -370,18 +369,16 @@ struct spi_flash *spi_flash_programmer_probe(struct spi_slave *spi, int force)
 	return flash;
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
 	/* This is special hardware. We expect bus 0 and CS line 0 here. */
 	if ((bus != 0) || (cs != 0))
-		return NULL;
-
-	struct spi_slave *slave = car_get_var_ptr(&boot_spi);
+		return -1;
 
 	slave->bus = bus;
 	slave->cs = cs;
 
-	return slave;
+	return 0;
 }
 
 int spi_flash_get_fpr_info(struct fpr_info *info)