Patchwork RX-51: ARM errata 430973 workaround

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Submitter Pali Rohár
Date March 31, 2013, 1:54 p.m.
Message ID <1364738063-23868-1-git-send-email-pali.rohar@gmail.com>
Download mbox | patch
Permalink /patch/232611/
State New
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Comments

Pali Rohár - March 31, 2013, 1:54 p.m.
Closed and signed Nokia X-Loader bootloader stored in RX-51 nand does not set
IBE bit in ACTLR and starting kernel in non-secure mode. So direct write to
ACTLR by our kernel does not working and the code for ARM errata 430973 in
commit 7ce236fcd6fd45b0441a2d49acb2ceb2de2e8a47 that sets IBE bit is a noop.

In order to have workaround for ARM errata 430973 from non-secure world on
RX-51 we needs Secure Monitor Call to set IBE BIT in ACTLR.

This patch adds RX-51 specific SMC support and sets IBE bit in ACTLR during
board init code for ARM errata 430973 workaround.

Because all the setup and what arguments are required for SMC are completely
different from SoC to SoC it is not possible to create generic SMC handling.
Code in omap-smc.S looks identical but it is not. So RX-51 needs another code.

ARM errata 430973 workaround is needed for thumb-2 ISA compiled userspace
binaries. Without this workaround thumb-2 binaries crashing. So with this
patch it is possible to recompile and run applications/binaries with thumb-2
ISA on RX-51.

Signed-off-by: Ivaylo Dimitrov <freemangordon@abv.bg>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
---
 arch/arm/mach-omap2/Makefile            |    1 +
 arch/arm/mach-omap2/board-rx51-secure.c |   66 +++++++++++++++++++++++++++++++
 arch/arm/mach-omap2/board-rx51-secure.h |   36 +++++++++++++++++
 arch/arm/mach-omap2/board-rx51-smc.S    |   34 ++++++++++++++++
 arch/arm/mach-omap2/board-rx51.c        |    7 ++++
 5 files changed, 144 insertions(+)
 create mode 100644 arch/arm/mach-omap2/board-rx51-secure.c
 create mode 100644 arch/arm/mach-omap2/board-rx51-secure.h
 create mode 100644 arch/arm/mach-omap2/board-rx51-smc.S
Santosh Shilimkar - April 1, 2013, 8:33 a.m.
On Sunday 31 March 2013 07:24 PM, Pali Rohár wrote:
> Closed and signed Nokia X-Loader bootloader stored in RX-51 nand does not set
> IBE bit in ACTLR and starting kernel in non-secure mode. So direct write to
> ACTLR by our kernel does not working and the code for ARM errata 430973 in
> commit 7ce236fcd6fd45b0441a2d49acb2ceb2de2e8a47 that sets IBE bit is a noop.
> 
> In order to have workaround for ARM errata 430973 from non-secure world on
> RX-51 we needs Secure Monitor Call to set IBE BIT in ACTLR.
> 
> This patch adds RX-51 specific SMC support and sets IBE bit in ACTLR during
> board init code for ARM errata 430973 workaround.
> 
> Because all the setup and what arguments are required for SMC are completely
> different from SoC to SoC it is not possible to create generic SMC handling.
> Code in omap-smc.S looks identical but it is not. So RX-51 needs another code.
> 
> ARM errata 430973 workaround is needed for thumb-2 ISA compiled userspace
> binaries. Without this workaround thumb-2 binaries crashing. So with this
> patch it is possible to recompile and run applications/binaries with thumb-2
> ISA on RX-51.
> 
> Signed-off-by: Ivaylo Dimitrov <freemangordon@abv.bg>
> Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
> ---
>  arch/arm/mach-omap2/Makefile            |    1 +
>  arch/arm/mach-omap2/board-rx51-secure.c |   66 +++++++++++++++++++++++++++++++
>  arch/arm/mach-omap2/board-rx51-secure.h |   36 +++++++++++++++++
>  arch/arm/mach-omap2/board-rx51-smc.S    |   34 ++++++++++++++++
>  arch/arm/mach-omap2/board-rx51.c        |    7 ++++
>  5 files changed, 144 insertions(+)
>  create mode 100644 arch/arm/mach-omap2/board-rx51-secure.c
>  create mode 100644 arch/arm/mach-omap2/board-rx51-secure.h
>  create mode 100644 arch/arm/mach-omap2/board-rx51-smc.S
> 
> diff --git a/arch/arm/mach-omap2/board-rx51-smc.S b/arch/arm/mach-omap2/board-rx51-smc.S
> new file mode 100644
> index 0000000..70e2eb7
> --- /dev/null
> +++ b/arch/arm/mach-omap2/board-rx51-smc.S
> @@ -0,0 +1,34 @@
You can avoid creating board-rx51-smc.S by having rx51_ppa_smc()
part of board-rx51-secure.c using inline asm. You can avoid the
board-rx51-secure.h as well considering the usage is limited to
the rx51 board.

Regards,
Santosh

Patch

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 37c4e09..cc4665d 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -244,6 +244,7 @@  obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51.o sdram-nokia.o
 obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51-peripherals.o
 obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51-video.o
 obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51-camera.o
+obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51-smc.o board-rx51-secure.o
 obj-$(CONFIG_MACH_OMAP_ZOOM2)		+= board-zoom.o board-zoom-peripherals.o
 obj-$(CONFIG_MACH_OMAP_ZOOM2)		+= board-zoom-display.o
 obj-$(CONFIG_MACH_OMAP_ZOOM2)		+= board-zoom-debugboard.o
diff --git a/arch/arm/mach-omap2/board-rx51-secure.c b/arch/arm/mach-omap2/board-rx51-secure.c
new file mode 100644
index 0000000..361dc78
--- /dev/null
+++ b/arch/arm/mach-omap2/board-rx51-secure.c
@@ -0,0 +1,66 @@ 
+/*
+ * RX51 Secure PPA API.
+ *
+ * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
+ *
+ *
+ * This program is free software,you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <asm/cacheflush.h>
+
+#include "board-rx51-secure.h"
+
+/**
+ * rx51_secure_dispatcher: Routine to dispatch secure PPA API calls
+ * @idx: The PPA API index
+ * @flag: The flag indicating criticality of operation
+ * @nargs: Number of valid arguments out of four.
+ * @arg1, arg2, arg3 args4: Parameters passed to secure API
+ *
+ * Return the non-zero error value on failure.
+ */
+u32 rx51_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
+			   u32 arg3, u32 arg4)
+{
+	u32 ret;
+	u32 param[5];
+
+	param[0] = nargs+1;
+	param[1] = arg1;
+	param[2] = arg2;
+	param[3] = arg3;
+	param[4] = arg4;
+
+	/*
+	 * Secure API needs physical address
+	 * pointer for the parameters
+	 */
+	flush_cache_all();
+	outer_clean_range(__pa(param), __pa(param + 5));
+	ret = rx51_ppa_smc(idx, flag, __pa(param));
+
+	return ret;
+}
+
+/**
+ * rx51_secure_update_aux_cr: Routine to modify the contents of Auxiliary Control Register
+ *  @set_bits: bits to set in ACR
+ *  @clr_bits: bits to clear in ACR
+ *
+ * Return the non-zero error value on failure.
+*/
+u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
+{
+	u32 acr;
+
+	/* Read ACR */
+	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
+	acr &= ~clear_bits;
+	acr |= set_bits;
+
+	return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
+			       FLAG_START_CRITICAL,
+			       1,acr,0,0,0);
+}
diff --git a/arch/arm/mach-omap2/board-rx51-secure.h b/arch/arm/mach-omap2/board-rx51-secure.h
new file mode 100644
index 0000000..61c760b
--- /dev/null
+++ b/arch/arm/mach-omap2/board-rx51-secure.h
@@ -0,0 +1,36 @@ 
+/*
+ * board-rx51-secure.h: OMAP Secure infrastructure header.
+ *
+ * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef OMAP_RX51_SECURE_H
+#define OMAP_RX51_SECURE_H
+
+/* HAL API error codes */
+#define  API_HAL_RET_VALUE_OK           0x00
+#define  API_HAL_RET_VALUE_FAIL         0x01
+
+/* Secure HAL API flags */
+#define FLAG_START_CRITICAL             0x4
+#define FLAG_IRQFIQ_MASK                0x3
+#define FLAG_IRQ_ENABLE                 0x2
+#define FLAG_FIQ_ENABLE                 0x1
+#define NO_FLAG                         0x0
+
+/* Secure PPA(Primary Protected Application) APIs */
+#define RX51_PPA_L2_INVAL               40
+#define RX51_PPA_WRITE_ACR              42
+
+#ifndef __ASSEMBLER__
+
+extern u32 rx51_secure_dispatcher(u32 idx, u32 flag, u32 nargs,
+                                u32 arg1, u32 arg2, u32 arg3, u32 arg4);
+extern u32 rx51_ppa_smc(u32 id, u32 flag, u32 pargs);
+
+extern u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits);
+#endif /* __ASSEMBLER__ */
+#endif /* OMAP_RX51_SECURE_H */
diff --git a/arch/arm/mach-omap2/board-rx51-smc.S b/arch/arm/mach-omap2/board-rx51-smc.S
new file mode 100644
index 0000000..70e2eb7
--- /dev/null
+++ b/arch/arm/mach-omap2/board-rx51-smc.S
@@ -0,0 +1,34 @@ 
+/*
+ * RX51 secure APIs file.
+ *
+ * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
+ *
+ *
+ * This program is free software,you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+
+/**
+ * u32 rx51_ppa_smc(u32 id, u32 flag, u32 pargs)
+ * Low level common routine for secure HAL and PPA APIs.
+ * @id: Secure Service ID
+ * @flag: Flag to indicate the criticality of operation
+ * @pargs: Physical address of parameter list starting
+ *          with number of parametrs
+ */
+ENTRY(rx51_ppa_smc)
+	.arch_extension sec
+	stmfd	sp!, {r4-r12, lr}
+	mov	r12, r0		@ Copy the secure service ID
+	mov	r3, r2		@ Copy the pointer to va_list in R3
+	mov	r2, r1		@ Copy the flags in R2
+	mov	r1, #0x0	@ Process ID - 0
+	mov	r6, #0xff	@ Indicate new Task call
+	dsb
+	dmb
+	smc	#1		@ call PPA service
+	ldmfd	sp!, {r4-r12, pc}
+ENDPROC(rx51_ppa_smc)
diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
index 03663c2..74f83a5 100644
--- a/arch/arm/mach-omap2/board-rx51.c
+++ b/arch/arm/mach-omap2/board-rx51.c
@@ -32,6 +32,7 @@ 
 #include "gpmc.h"
 #include "pm.h"
 #include "sdram-nokia.h"
+#include "board-rx51-secure.h"
 
 #define RX51_GPIO_SLEEP_IND 162
 
@@ -105,6 +106,12 @@  static void __init rx51_init(void)
 	rx51_peripherals_init();
 	rx51_camera_init();
 
+#ifdef CONFIG_ARM_ERRATA_430973
+	printk(KERN_INFO "RX-51: Enabling ARM errata 430973 workaround.\n");
+	/* set IBE to 1 */
+	rx51_secure_update_aux_cr(1 << 6, 0);
+#endif
+
 	/* Ensure SDRC pins are mux'd for self-refresh */
 	omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
 	omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);