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-rw-r--r--src/drivers/spi/acpi/Kconfig18
-rw-r--r--src/drivers/spi/acpi/Makefile.inc16
-rw-r--r--src/drivers/spi/acpi/acpi.c146
-rw-r--r--src/drivers/spi/acpi/chip.h32
4 files changed, 212 insertions, 0 deletions
diff --git a/src/drivers/spi/acpi/Kconfig b/src/drivers/spi/acpi/Kconfig
new file mode 100644
index 0000000000..c1653d55e4
--- /dev/null
+++ b/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
diff --git a/src/drivers/spi/acpi/Makefile.inc b/src/drivers/spi/acpi/Makefile.inc
new file mode 100644
index 0000000000..7ae6e459d9
--- /dev/null
+++ b/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
diff --git a/src/drivers/spi/acpi/acpi.c b/src/drivers/spi/acpi/acpi.c
new file mode 100644
index 0000000000..0d7d2aa429
--- /dev/null
+++ b/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
+};
diff --git a/src/drivers/spi/acpi/chip.h b/src/drivers/spi/acpi/chip.h
new file mode 100644
index 0000000000..f0cc9417cb
--- /dev/null
+++ b/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__ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 16:22:17 +0000