mb/dell: OptiPlex 3050 Micro port (Intel KabyLake)

- Boots Linux 6.11 (Debian)
- GRUB and SeaBIOS payloads work
- SMSC SCH5553 SIO/EC
  + Serial port works
  + PWM fan control works
- Realtek Gigabit LAN works
- WiFi slot works
- NVMe SSD slot works
- Extra: LPSS UART0
  + Stock FW sets undocumented power gating bit, RTC battery needs to
    be pulled for it to work.
  + Signals exposed on test points on the back of the board.
    FIXME: add documentation about this
- Needs 'deguard' to bypass BootGuard
  + See https://review.coreboot.org/admin/repos/deguard,general
- Audio works
- All USB ports work
- Currently limited to the Micro form factor, but others are very
  similar
- HDA verbs and VBT by Leah Rowe

Change-Id: I8d443e39ee684a4eaa19c835a945cfe569c051e2
Signed-off-by: Mate Kukri <kukri.mate@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82053
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/src/mainboard/dell/optiplex_3050/sch5555_ec.c b/src/mainboard/dell/optiplex_3050/sch5555_ec.c
new file mode 100644
index 0000000000..1df5026531
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/sch5555_ec.c
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/io.h>
+#include <device/pnp_ops.h>
+#include <superio/smsc/sch555x/sch555x.h>
+#include "sch5555_ec.h"
+
+uint8_t sch5555_mbox_read(uint8_t addr1, uint16_t addr2)
+{
+	// clear ec-to-host mailbox
+	uint8_t tmp = inb(SCH555x_EMI_IOBASE + 1);
+	outb(tmp, SCH555x_EMI_IOBASE + 1);
+
+	// send address
+	outw(0 | 0x8001, SCH555x_EMI_IOBASE + 2);
+	outw((addr1 * 2) | 0x100, SCH555x_EMI_IOBASE + 4);
+
+	outw(4 | 0x8002, SCH555x_EMI_IOBASE + 2);
+	outl(addr2 << 16, SCH555x_EMI_IOBASE + 4);
+
+	// send message to ec
+	outb(1, SCH555x_EMI_IOBASE);
+
+	// wait for ack
+	for (size_t retry = 0; retry < 0xfff; ++retry)
+		if (inb(SCH555x_EMI_IOBASE + 1) & 1)
+			break;
+
+	// read result
+	outw(4 | 0x8000, SCH555x_EMI_IOBASE + 2);
+	return inb(SCH555x_EMI_IOBASE + 4);
+}
+
+void sch5555_mbox_write(uint8_t addr1, uint16_t addr2, uint8_t val)
+{
+	// clear ec-to-host mailbox
+	uint8_t tmp = inb(SCH555x_EMI_IOBASE + 1);
+	outb(tmp, SCH555x_EMI_IOBASE + 1);
+
+	// send address and value
+	outw(0 | 0x8001, SCH555x_EMI_IOBASE + 2);
+	outw((addr1 * 2) | 0x101, SCH555x_EMI_IOBASE + 4);
+
+	outw(4 | 0x8002, SCH555x_EMI_IOBASE + 2);
+	outl(val | (addr2 << 16), SCH555x_EMI_IOBASE + 4);
+
+	// send message to ec
+	outb(1, SCH555x_EMI_IOBASE);
+
+	// wait for ack
+	for (size_t retry = 0; retry < 0xfff; ++retry)
+		if (inb(SCH555x_EMI_IOBASE + 1) & 1)
+			break;
+}