drivers/spi: Get rid of spi_get_config

There is only one user for spi_get_config i.e. SPI ACPI. Also, the
values provided by spi_get_config are constant for now. Thus, get rid
of the spi_get_config call and fill in these constant values in SPI
ACPI code itself. If there is a need in the future to change these,
appropriate device-tree configs can be added.

BUG=b:36873582

Change-Id: Ied38e2670784ee3317bb12e542666c224bd9e819
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19203
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/drivers/spi/acpi/acpi.c

@@ -76,13 +76,15 @@ static void spi_acpi_fill_ssdt_generator(struct device *dev)
 	struct drivers_spi_acpi_config *config = dev->chip_info;
 	const char *scope = acpi_device_scope(dev);
 	const char *path = acpi_device_path(dev);
-	struct spi_cfg spi_cfg;
-	struct spi_slave slave;
-	int bus = -1, cs = dev->path.spi.cs;
 	struct acpi_spi spi = {
-		.device_select = cs,
+		.device_select = dev->path.spi.cs,
 		.speed = config->speed ? : 1 * MHz,
 		.resource = scope,
+		.device_select_polarity = SPI_POLARITY_LOW,
+		.wire_mode = SPI_4_WIRE_MODE,
+		.data_bit_length = 8,
+		.clock_phase = SPI_CLOCK_PHASE_FIRST,
+		.clock_polarity = SPI_POLARITY_LOW,
 	};
 	int curr_index = 0;
 	int irq_gpio_index = -1;
@@ -92,10 +94,9 @@ static void spi_acpi_fill_ssdt_generator(struct device *dev)
 	if (!dev->enabled || !scope)
 		return;
 
-	bus = spi_acpi_get_bus(dev);
+	if (spi_acpi_get_bus(dev) == -1) {
-	if (bus == -1) {
 		printk(BIOS_ERR, "%s: ERROR: Cannot get bus for device.\n",
-		       dev_path(dev));
+			dev_path(dev));
 		return;
 	}
 
@@ -104,23 +105,6 @@ static void spi_acpi_fill_ssdt_generator(struct device *dev)
 		return;
 	}
 
-	if (spi_setup_slave(bus, cs, &slave)) {
-		printk(BIOS_ERR, "%s: ERROR: SPI setup failed.\n",
-			dev_path(dev));
-		return;
-	}
-
-	if (spi_get_config(&slave, &spi_cfg)) {
-		printk(BIOS_ERR, "%s: ERROR: SPI get config failed.\n",
-			dev_path(dev));
-		return;
-	}
-
-	spi.device_select_polarity = spi_cfg.cs_polarity;
-	spi.wire_mode = spi_cfg.wire_mode;
-	spi.data_bit_length = spi_cfg.data_bit_length;
-	spi.clock_phase = spi_cfg.clk_phase;
-
 	/* Device */
 	acpigen_write_scope(scope);
 	acpigen_write_device(acpi_device_name(dev));

src/drivers/spi/spi-generic.c

@@ -88,16 +88,6 @@ int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout,
 	return -1;
 }
 
-int spi_get_config(const struct spi_slave *slave, struct spi_cfg *cfg)
-{
-	const struct spi_ctrlr *ctrlr = slave->ctrlr;
-
-	if (ctrlr && ctrlr->get_config)
-		return ctrlr->get_config(slave, cfg);
-
-	return -1;
-}
-
 void __attribute__((weak)) spi_init(void)
 {
 	/* Default weak implementation - do nothing. */

src/include/spi-generic.h

@@ -90,7 +90,6 @@ struct spi_cfg {
 /*-----------------------------------------------------------------------
  * Representation of a SPI contoller.
  *
- * get_config:	Get configuration of SPI bus
  * claim_bus:	Claim SPI bus and prepare for communication.
  * release_bus: Release SPI bus.
  * setup:	Setup given SPI device bus.
@@ -98,8 +97,6 @@ struct spi_cfg {
  * xfer_vector: Vector of SPI transfer operations.
  */
 struct spi_ctrlr {
-	int (*get_config)(const struct spi_slave *slave,
-			struct spi_cfg *cfg);
 	int (*claim_bus)(const struct spi_slave *slave);
 	void (*release_bus)(const struct spi_slave *slave);
 	int (*setup)(const struct spi_slave *slave);

src/soc/intel/common/block/gspi/gspi.c

@@ -307,26 +307,6 @@ int __attribute__((weak)) gspi_get_soc_spi_cfg(unsigned int gspi_bus,
 	return 0;
 }
 
-static int gspi_ctrlr_get_config(const struct spi_slave *dev,
-				struct spi_cfg *cfg)
-{
-	unsigned int gspi_bus;
-
-	/* Currently, only chip select 0 is supported. */
-	if (dev->cs != 0) {
-		printk(BIOS_ERR, "%s: Invalid CS value: cs=%u.\n", __func__,
-			dev->cs);
-		return -1;
-	}
-
-	if (gspi_soc_spi_to_gspi_bus(dev->bus, &gspi_bus)) {
-		printk(BIOS_ERR, "%s: Failed to find GSPI bus for SPI %u.\n",
-		       __func__, dev->bus);
-		return -1;
-	}
-	return gspi_get_soc_spi_cfg(gspi_bus, cfg);
-}
-
 static int gspi_cs_assert(const struct spi_slave *dev)
 {
 	return gspi_cs_change(dev, CS_ASSERT);
@@ -627,7 +607,6 @@ static int gspi_ctrlr_xfer(const struct spi_slave *dev,
 }
 
 const struct spi_ctrlr gspi_ctrlr = {
-	.get_config = gspi_ctrlr_get_config,
 	.claim_bus = gspi_cs_assert,
 	.release_bus = gspi_cs_deassert,
 	.setup = gspi_ctrlr_setup,