Xtensa updates for v6.6

- enable MTD XIP support
 - fix base address of the xtensa perf module in newer hardware
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Merge tag 'xtensa-20230905' of https://github.com/jcmvbkbc/linux-xtensa

Pull xtensa updates from Max Filippov:

 - enable MTD XIP support

 - fix base address of the xtensa perf module in newer hardware

* tag 'xtensa-20230905' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: add XIP-aware MTD support
  xtensa: PMU: fix base address for the newer hardware

arch/xtensa/Kconfig

@@ -71,6 +71,9 @@ config ARCH_HAS_ILOG2_U32
 config ARCH_HAS_ILOG2_U64
 	def_bool n
 
+config ARCH_MTD_XIP
+	def_bool y
+
 config NO_IOPORT_MAP
 	def_bool n
 

arch/xtensa/include/asm/core.h

@@ -52,4 +52,13 @@
 #define XTENSA_STACK_ALIGNMENT	16
 #endif
 
+#ifndef XCHAL_HW_MIN_VERSION
+#if defined(XCHAL_HW_MIN_VERSION_MAJOR) && defined(XCHAL_HW_MIN_VERSION_MINOR)
+#define XCHAL_HW_MIN_VERSION (XCHAL_HW_MIN_VERSION_MAJOR * 100 + \
+			      XCHAL_HW_MIN_VERSION_MINOR)
+#else
+#define XCHAL_HW_MIN_VERSION 0
+#endif
+#endif
+
 #endif

arch/xtensa/include/asm/mtd-xip.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ASM_MTD_XIP_H
+#define _ASM_MTD_XIP_H
+
+#include <asm/processor.h>
+
+#define xip_irqpending()	(xtensa_get_sr(interrupt) & xtensa_get_sr(intenable))
+#define xip_currtime()		(xtensa_get_sr(ccount))
+#define xip_elapsed_since(x)	((xtensa_get_sr(ccount) - (x)) / 1000) /* should work up to 1GHz */
+#define xip_cpu_idle()		do { asm volatile ("waiti 0"); } while (0)
+
+#endif /* _ASM_MTD_XIP_H */
+

arch/xtensa/include/asm/sections.h

@@ -34,6 +34,10 @@ extern char _SecondaryResetVector_text_start[];
 extern char _SecondaryResetVector_text_end[];
 #endif
 #ifdef CONFIG_XIP_KERNEL
+#ifdef CONFIG_VECTORS_ADDR
+extern char _xip_text_start[];
+extern char _xip_text_end[];
+#endif
 extern char _xip_start[];
 extern char _xip_end[];
 #endif

arch/xtensa/kernel/perf_event.c

@@ -13,17 +13,26 @@
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
 
+#include <asm/core.h>
 #include <asm/processor.h>
 #include <asm/stacktrace.h>
 
+#define XTENSA_HWVERSION_RG_2015_0	260000
+
+#if XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RG_2015_0
+#define XTENSA_PMU_ERI_BASE		0x00101000
+#else
+#define XTENSA_PMU_ERI_BASE		0x00001000
+#endif
+
 /* Global control/status for all perf counters */
-#define XTENSA_PMU_PMG			0x1000
+#define XTENSA_PMU_PMG			XTENSA_PMU_ERI_BASE
 /* Perf counter values */
-#define XTENSA_PMU_PM(i)		(0x1080 + (i) * 4)
+#define XTENSA_PMU_PM(i)		(XTENSA_PMU_ERI_BASE + 0x80 + (i) * 4)
 /* Perf counter control registers */
-#define XTENSA_PMU_PMCTRL(i)		(0x1100 + (i) * 4)
+#define XTENSA_PMU_PMCTRL(i)		(XTENSA_PMU_ERI_BASE + 0x100 + (i) * 4)
 /* Perf counter status registers */
-#define XTENSA_PMU_PMSTAT(i)		(0x1180 + (i) * 4)
+#define XTENSA_PMU_PMSTAT(i)		(XTENSA_PMU_ERI_BASE + 0x180 + (i) * 4)
 
 #define XTENSA_PMU_PMG_PMEN		0x1
 

arch/xtensa/kernel/setup.c

@@ -311,6 +311,9 @@ void __init setup_arch(char **cmdline_p)
 
 	mem_reserve(__pa(_stext), __pa(_end));
 #ifdef CONFIG_XIP_KERNEL
+#ifdef CONFIG_VECTORS_ADDR
+	mem_reserve(__pa(_xip_text_start), __pa(_xip_text_end));
+#endif
 	mem_reserve(__pa(_xip_start), __pa(_xip_end));
 #endif
 

arch/xtensa/kernel/vmlinux.lds.S

@@ -118,6 +118,7 @@ SECTIONS
     SECTION_VECTOR2 (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
 
     *(.exception.text)
+    *(.xiptext)
 #endif
 
     IRQENTRY_TEXT
@@ -201,6 +202,9 @@ SECTIONS
 		   .DebugInterruptVector.text);
     RELOCATE_ENTRY(_exception_text,
 		   .exception.text);
+#ifdef CONFIG_XIP_KERNEL
+    RELOCATE_ENTRY(_xip_text, .xiptext);
+#endif
 #endif
 #ifdef CONFIG_XIP_KERNEL
     RELOCATE_ENTRY(_xip_data, .data);
@@ -319,7 +323,12 @@ SECTIONS
 		  LAST)
 #undef LAST
 #define LAST .exception.text
-
+  SECTION_VECTOR4 (_xip_text,
+		  .xiptext,
+		  ,
+		  LAST)
+#undef LAST
+#define LAST .xiptext
 #endif
   . = (LOADADDR(LAST) + SIZEOF(LAST) + 3) & ~ 3;