[OpenWrt-Devel] [PATCH 1/6] ramips: mt7621: add patch to setup CM memory region for palmbus

[Nikolay Martynov]

This is tested and works on ubnt-erx.

Unfortunately I do not have official datasheet for
this SoC so I had to guess memory region size. Those numbers
may need to be tweaked if there are devices that need larger
memory region or if datasheet has something to say about them.

Signed-off-by: Nikolay Martynov <mar.kolya at gmail.com>
---
 .../0060-mt7621-set-up-palmbus-memory-region.patch | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch

diff --git a/target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch b/target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch
new file mode 100644
index 0000000..d8c1b85
--- /dev/null
+++ b/target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch
@@ -0,0 +1,36 @@
+--- a/arch/mips/include/asm/mach-ralink/mt7621.h
++++ b/arch/mips/include/asm/mach-ralink/mt7621.h
+@@ -13,6 +13,9 @@
+ #ifndef _MT7621_REGS_H_
+ #define _MT7621_REGS_H_
+ 
++#define MT7621_PALMBUS_BASE		0x1E000000
++#define MT7621_PALMBUS_SIZE		0x001FFFFF
++
+ #define MT7621_SYSC_BASE		0x1E000000
+ 
+ #define SYSC_REG_CHIP_NAME0		0x00
+--- a/arch/mips/ralink/mt7621.c
++++ b/arch/mips/ralink/mt7621.c
+@@ -199,6 +199,21 @@ void prom_soc_init(struct ralink_soc_inf
+ 	mips_cm_probe();
+ 	mips_cpc_probe();
+ 
++	if (mips_cm_numiocu()) {
++		/* mips_cm_probe() wipes out bootloader
++		   config for CM regions and we have to configure them
++		   again. This SoC cannot talk to pamlbus devices
++		   witout proper iocu region set up.
++
++		   FIXME: it would be better to do this with values
++		   from DT, but we need this very early because
++		   without this wecannot talk to pretty much anything
++		   including serial.
++		*/
++		write_gcr_reg0_base(MT7621_PALMBUS_BASE);
++		write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE | CM_GCR_REGn_MASK_CMTGT_IOCU0);
++	}
++
+ 	if (!register_cps_smp_ops())
+ 		return;
+ 	if (!register_cmp_smp_ops())
-- 
2.6.4
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