drivers/spi: Add support for generating SPI device in SSDT

Similar to I2C driver, add support for generating SPI device and
required properties in SSDT for ACPI.

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles succesfully. Verified SPI device generated in SSDT on
poppy.

Change-Id: Ic4da79c823131d54d9eb3652b86f6e40fe643ab5
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18342
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/drivers/spi/acpi/Kconfig

@@ -0,0 +1,18 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright 2017 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+config DRIVERS_SPI_ACPI
+	bool
+	depends on HAVE_ACPI_TABLES

src/drivers/spi/acpi/Makefile.inc

@@ -0,0 +1,16 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright 2017 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+ramstage-$(CONFIG_DRIVERS_SPI_ACPI) += acpi.c

src/drivers/spi/acpi/acpi.c

@@ -0,0 +1,146 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2017 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/acpi_device.h>
+#include <arch/acpigen.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <device/spi.h>
+#include <spi-generic.h>
+#include <stdint.h>
+#include <string.h>
+#include "chip.h"
+
+static int spi_acpi_get_bus(struct device *dev)
+{
+	struct device *spi_dev;
+	struct device_operations *ops;
+
+	if (!dev->bus || !dev->bus->dev)
+		return -1;
+
+	spi_dev = dev->bus->dev;
+	ops = spi_dev->ops;
+
+	if (ops && ops->ops_spi_bus &&
+	    ops->ops_spi_bus->dev_to_bus)
+		return ops->ops_spi_bus->dev_to_bus(spi_dev);
+
+	return -1;
+}
+
+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);
+	struct spi_cfg spi_cfg;
+	struct spi_slave slave;
+	int bus = -1, cs = dev->path.spi.cs;
+	struct acpi_spi spi = {
+		.device_select = cs,
+		.speed = config->speed ? : 1 * MHz,
+		.resource = scope,
+	};
+
+	if (!dev->enabled || !scope)
+		return;
+
+	bus = spi_acpi_get_bus(dev);
+	if (bus == -1) {
+		printk(BIOS_ERR, "%s: ERROR: Cannot get bus for device.\n",
+		       dev_path(dev));
+		return;
+	}
+
+	if (!config->hid) {
+		printk(BIOS_ERR, "%s: ERROR: HID required.\n", dev_path(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));
+	acpigen_write_name_string("_HID", config->hid);
+	if (config->cid)
+		acpigen_write_name_string("_CID", config->cid);
+	acpigen_write_name_integer("_UID", config->uid);
+	if (config->desc)
+		acpigen_write_name_string("_DDN", config->desc);
+
+	/* Resources */
+	acpigen_write_name("_CRS");
+	acpigen_write_resourcetemplate_header();
+	acpi_device_write_spi(&spi);
+	acpi_device_write_interrupt(&config->irq);
+	acpigen_write_resourcetemplate_footer();
+
+	if (config->compat_string) {
+		struct acpi_dp *dsd = acpi_dp_new_table("_DSD");
+		acpi_dp_add_string(dsd, "compatible", config->compat_string);
+		acpi_dp_write(dsd);
+	}
+
+	acpigen_pop_len(); /* Device */
+	acpigen_pop_len(); /* Scope */
+}
+
+static const char *spi_acpi_name(struct device *dev)
+{
+	struct drivers_spi_acpi_config *config = dev->chip_info;
+	static char name[5];
+
+	if (config->name)
+		return config->name;
+
+	snprintf(name, sizeof(name), "S%03.3X", spi_acpi_get_bus(dev));
+	name[4] = '\0';
+	return name;
+}
+
+static struct device_operations spi_acpi_ops = {
+	.read_resources		  = DEVICE_NOOP,
+	.set_resources		  = DEVICE_NOOP,
+	.enable_resources	  = DEVICE_NOOP,
+	.acpi_name		  = &spi_acpi_name,
+	.acpi_fill_ssdt_generator = &spi_acpi_fill_ssdt_generator,
+};
+
+static void spi_acpi_enable(struct device *dev)
+{
+	dev->ops = &spi_acpi_ops;
+}
+
+struct chip_operations drivers_spi_acpi_ops = {
+	CHIP_NAME("SPI Device")
+	.enable_dev = &spi_acpi_enable
+};

src/drivers/spi/acpi/chip.h

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2017 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SPI_ACPI_CHIP_H__
+#define __SPI_ACPI_CHIP_H__
+
+#include <arch/acpi_device.h>
+
+struct drivers_spi_acpi_config {
+	const char *hid;		/* ACPI _HID (required) */
+	const char *cid;		/* ACPI _CID */
+	const char *name;		/* ACPI Device Name */
+	const char *desc;		/* Device Description */
+	unsigned uid;			/* ACPI _UID */
+	unsigned speed;		/* Bus speed in Hz (default 1MHz) */
+	const char *compat_string;	/* Compatible string for _HID=PRP0001 */
+	struct acpi_irq irq;		/* Interrupt */
+};
+
+#endif /* __SPI_ACPI_CHIP_H__ */