soc/intel/common: Provide common block fast_spi_flash_ctrlr

Now that we have a common block driver for fast spi flash controller,
provide spi_ctrlr structure that can be used by different platforms
for defining the bus-ctrlr mapping. Only cs 0 is considered valid.

Change-Id: I7228ae885018d1e23e6e80dd8ce227b0d99d84a6
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19575
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/apollolake/spi.c

@@ -15,28 +15,11 @@
  */
 
 #include <console/console.h>
+#include <intelblocks/fast_spi.h>
 #include <spi-generic.h>
 
-/* SPI controller managing the fast SPI. */
-static int fast_spi_ctrlr_setup(const struct spi_slave *dev)
-{
-	if ((dev->bus != 0) && (dev->cs != 0)) {
-		printk(BIOS_ERR, "%s: Unsupported device "
-		       "bus=0x%x,cs=0x%x!\n", __func__, dev->bus, dev->cs);
-		return -1;
-	}
-
-	printk(BIOS_INFO, "%s: Found controller for device "
-	       "(bus=0x%x,cs=0x%x)!!\n", __func__, dev->bus, dev->cs);
-	return 0;
-}
-
-static const struct spi_ctrlr fast_spi_ctrlr = {
-	.setup = fast_spi_ctrlr_setup,
-};
-
 const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
-	{ .ctrlr = &fast_spi_ctrlr, .bus_start = 0, .bus_end = 0 },
+	{ .ctrlr = &fast_spi_flash_ctrlr, .bus_start = 0, .bus_end = 0 },
 };
 
 const size_t spi_ctrlr_bus_map_count = ARRAY_SIZE(spi_ctrlr_bus_map);

src/soc/intel/common/block/fast_spi/fast_spi_flash.c

@@ -350,3 +350,18 @@ int fast_spi_flash_read_wpsr(u8 *sr)
 
 	return 0;
 }
+
+static int fast_spi_flash_ctrlr_setup(const struct spi_slave *dev)
+{
+	if (dev->cs != 0) {
+		printk(BIOS_ERR, "%s: Invalid CS for fast SPI bus=0x%x,cs=0x%x!\n",
+		       __func__, dev->bus, dev->cs);
+		return -1;
+	}
+
+	return 0;
+}
+
+const struct spi_ctrlr fast_spi_flash_ctrlr = {
+	.setup = fast_spi_flash_ctrlr_setup,
+};

src/soc/intel/common/block/include/intelblocks/fast_spi.h

@@ -64,4 +64,10 @@ size_t fast_spi_get_bios_region(size_t *bios_size);
  */
 void fast_spi_early_init(uintptr_t spi_base_address);
 
+/*
+ * Fast SPI flash controller structure to allow SoCs to define bus-controller
+ * mapping.
+ */
+extern const struct spi_ctrlr fast_spi_flash_ctrlr;
+
 #endif	/* SOC_INTEL_COMMON_BLOCK_FAST_SPI_H */

src/soc/intel/skylake/spi.c

@@ -20,28 +20,13 @@
 #include <device/pci_def.h>
 #include <device/pci_ids.h>
 #include <device/spi.h>
+#include <intelblocks/fast_spi.h>
 #include <intelblocks/gspi.h>
 #include <soc/ramstage.h>
 #include <spi-generic.h>
 
-/* SPI controller managing the flash-device SPI. */
-static int flash_spi_ctrlr_setup(const struct spi_slave *dev)
-{
-	if ((dev->bus != 0) || (dev->cs != 0)) {
-		printk(BIOS_ERR, "%s: Unsupported device bus=0x%x,cs=0x%x!\n",
-			__func__, dev->bus, dev->cs);
-		return -1;
-	}
-
-	return 0;
-}
-
-static const struct spi_ctrlr flash_spi_ctrlr = {
-	.setup = flash_spi_ctrlr_setup,
-};
-
 const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
-	{ .ctrlr = &flash_spi_ctrlr, .bus_start = 0, .bus_end = 0 },
+	{ .ctrlr = &fast_spi_flash_ctrlr, .bus_start = 0, .bus_end = 0 },
 #if !ENV_SMM
 	{ .ctrlr = &gspi_ctrlr, .bus_start = 1,
 	  .bus_end =  1 + (CONFIG_SOC_INTEL_COMMON_BLOCK_GSPI_MAX - 1)},