coreboot/dell: move e6400 to new tree, dell

the ddr2 fix broke *ddr3* on gm45 thinkpads in
testing, depending on memory modules. this was
established by removing patches, re-doing
configs etc, on a user's X200 (testing gentoo
and freebsd). the X200 kept randomly rebooting
or having random glitches.

the configs themselves (gm45 thinkpads) will
also be re-done, because i found minor issues
unrelated, but this patch moves dell e6400 to
its own tree. the ddr2 fix is no longer present
in coreboot/default, only coreboot/dell.

i noticed minor differences in gm45 thinkpad
configs, when re-doing the configs, versus
what are currently in lbmk master; for instance,
vbt was not enabled anymore, on thinkpad x200.
modifications to these will be done separately.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/config/coreboot/dell/patches/0020-ec-dell-mec5035-Add-command-to-enable-disable-radios.patch b/config/coreboot/dell/patches/0020-ec-dell-mec5035-Add-command-to-enable-disable-radios.patch
new file mode 100644
index 00000000..2f2cddfe
--- /dev/null
+++ b/config/coreboot/dell/patches/0020-ec-dell-mec5035-Add-command-to-enable-disable-radios.patch
@@ -0,0 +1,61 @@
+From f0db13a15c76c2947eec8919fd121450048914ce Mon Sep 17 00:00:00 2001
+From: Nicholas Chin <nic.c3.14@gmail.com>
+Date: Sun, 27 Aug 2023 17:36:36 -0600
+Subject: [PATCH 20/22] ec/dell/mec5035: Add command to enable/disable radios
+
+These were determined by sniffing the LPC bus while toggling the
+hardware wireless switch on the Latitude E6400. To differentiate devices
+options in the vendor BIOS to change which radios the switch controlled
+were used.
+
+Change-Id: I173dc197d63cda232dd7ede0cb798ab0a364482b
+Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
+---
+ src/ec/dell/mec5035/mec5035.c | 9 +++++++++
+ src/ec/dell/mec5035/mec5035.h | 8 ++++++++
+ 2 files changed, 17 insertions(+)
+
+diff --git a/src/ec/dell/mec5035/mec5035.c b/src/ec/dell/mec5035/mec5035.c
+index 8da11e5b1c..e0335a4635 100644
+--- a/src/ec/dell/mec5035/mec5035.c
++++ b/src/ec/dell/mec5035/mec5035.c
+@@ -84,6 +84,15 @@ u8 mec5035_mouse_touchpad(u8 setting)
+ 	return buf[0];
+ }
+ 
++void mec5035_radio_enable(enum mec5035_radio_dev dev, u8 on)
++{
++	/* From LPC traces and userspace testing with other values,
++	   the second byte has to be 2 for an unknown reason. */
++	u8 buf[3] = {dev, 2, on};
++	write_mailbox_regs(buf, 2, 3);
++	ec_command(CMD_RADIO_EN);
++}
++
+ void mec5035_early_init(void)
+ {
+ 	/* If this isn't sent the EC shuts down the system after about 15
+diff --git a/src/ec/dell/mec5035/mec5035.h b/src/ec/dell/mec5035/mec5035.h
+index e7a05b64d4..16512e2cc2 100644
+--- a/src/ec/dell/mec5035/mec5035.h
++++ b/src/ec/dell/mec5035/mec5035.h
+@@ -16,8 +16,16 @@
+ 
+ #define CMD_CPU_OK	0xc2
+ 
++#define CMD_RADIO_EN	0x2b
++enum mec5035_radio_dev {
++	RADIO_WLAN = 0,
++	RADIO_WWAN = 1,
++	RADIO_WPAN = 2,
++};
++
+ u8 mec5035_mouse_touchpad(u8 setting);
+ void mec5035_cpu_ok(void);
+ void mec5035_early_init(void);
++void mec5035_radio_enable(enum mec5035_radio_dev device, u8 on);
+ 
+ #endif /* _EC_DELL_MEC5035_H_ */
+-- 
+2.39.2
+