1 files changed, 122 insertions, 0 deletions
diff --git a/src/ec/dell/mec5035/mec5035.c b/src/ec/dell/mec5035/mec5035.c
new file mode 100644
index 0000000000..8da11e5b1c
--- /dev/null
+++ b/src/ec/dell/mec5035/mec5035.c
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pnp.h>
+#include <pc80/keyboard.h>
+#include <stdint.h>
+#include "mec5035.h"
+
+static const u16 MAILBOX_INDEX = 0x910;
+static const u16 MAILBOX_DATA = MAILBOX_INDEX + 1;
+
+static inline u8 __get_mailbox_register(u8 index)
+{
+	outb(index + 0x10, MAILBOX_INDEX);
+	return inb(MAILBOX_DATA);
+}
+
+static inline void __set_mailbox_register(u8 index, u8 data)
+{
+	outb(index + 0x10, MAILBOX_INDEX);
+	outb(data, MAILBOX_DATA);
+}
+
+static void wait_ec(void)
+{
+	u8 busy;
+	do {
+		outb(0, MAILBOX_INDEX);
+		busy = inb(MAILBOX_DATA);
+	} while (busy);
+}
+
+
+static enum cb_err read_mailbox_regs(u8 *data, u8 start, u8 count)
+{
+	if (start + count >= NUM_REGISTERS) {
+		printk(BIOS_ERR, "%s: Invalid start or count argument.\n", __func__);
+		return CB_ERR_ARG;
+	}
+
+	while (count--) {
+		*data = __get_mailbox_register(start);
+		data++;
+		start++;
+	}
+
+	return CB_SUCCESS;
+}
+
+static enum cb_err write_mailbox_regs(const u8 *data, u8 start, u8 count)
+{
+	if (start + count >= NUM_REGISTERS) {
+		printk(BIOS_ERR, "%s: Invalid start or count argument.\n", __func__);
+		return CB_ERR_ARG;
+	}
+
+	while (count--) {
+		__set_mailbox_register(start, *data);
+		data++;
+		start++;
+	}
+
+	return CB_SUCCESS;
+}
+
+static void ec_command(u8 cmd)
+{
+	outb(0, MAILBOX_INDEX);
+	outb(cmd, MAILBOX_DATA);
+	wait_ec();
+}
+
+u8 mec5035_mouse_touchpad(u8 setting)
+{
+	u8 buf[15] = {0};
+	write_mailbox_regs(&setting, 2, 1);
+	ec_command(CMD_MOUSE_TP);
+	/* The vendor firmware reads 15 bytes starting at index 1, presumably
+	   to get some sort of return code. Though I don't know for sure if
+	   this is the case. Assume the first byte is the return code. */
+	read_mailbox_regs(buf, 1, 15);
+	return buf[0];
+}
+
+void mec5035_early_init(void)
+{
+	/* If this isn't sent the EC shuts down the system after about 15
+	   seconds, flashing a pattern on the keyboard LEDs corresponding
+	   to "processor failure" according to Dell service manuals. */
+	ec_command(CMD_CPU_OK);
+}
+
+static void mec5035_init(struct device *dev)
+{
+	/* Unconditionally use this argument for now as this setting
+	   is probably the most sensible default out of the 3 choices. */
+	mec5035_mouse_touchpad(TP_PS2_MOUSE);
+
+	pc_keyboard_init(NO_AUX_DEVICE);
+}
+
+static struct device_operations ops = {
+	.init = mec5035_init,
+	.read_resources = noop_read_resources,
+	.set_resources = noop_set_resources
+};
+
+static struct pnp_info pnp_dev_info[] = {
+	{ NULL, 0, 0, 0, }
+};
+
+static void mec5035_enable(struct device *dev)
+{
+	pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
+}
+
+struct chip_operations ec_dell_mec5035_ops = {
+	CHIP_NAME("MEC5035 EC")
+	.enable_dev = mec5035_enable,
+};