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authorMike Frysinger <vapier.adi@gmail.com>2008-10-13 11:33:43 +0800
committerBryan Wu <cooloney@kernel.org>2008-10-13 11:33:43 +0800
commitcdbf4c3c5f4909767c21f47f68f2ee57a8b36b3b (patch)
tree4cfd19b106ca90c45ed3daf17fdb9727019ba889 /arch/blackfin
parent4e8086d65bd0a606434a4b16611653387f8c9698 (diff)
downloadblackbird-obmc-linux-cdbf4c3c5f4909767c21f47f68f2ee57a8b36b3b.tar.gz
blackbird-obmc-linux-cdbf4c3c5f4909767c21f47f68f2ee57a8b36b3b.zip
Blackfin arch: use the Blackfin on-chip ROM to do software reset when possible
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/include/asm/bfrom.h85
-rw-r--r--arch/blackfin/kernel/reboot.c10
2 files changed, 94 insertions, 1 deletions
diff --git a/arch/blackfin/include/asm/bfrom.h b/arch/blackfin/include/asm/bfrom.h
new file mode 100644
index 000000000000..cfe8024c3b2f
--- /dev/null
+++ b/arch/blackfin/include/asm/bfrom.h
@@ -0,0 +1,85 @@
+/* Blackfin on-chip ROM API
+ *
+ * Copyright 2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __BFROM_H__
+#define __BFROM_H__
+
+#include <linux/types.h>
+
+/* Possible syscontrol action flags */
+#define SYSCTRL_READ 0x00000000 /* read registers */
+#define SYSCTRL_WRITE 0x00000001 /* write registers */
+#define SYSCTRL_SYSRESET 0x00000002 /* perform system reset */
+#define SYSCTRL_CORERESET 0x00000004 /* perform core reset */
+#define SYSCTRL_SOFTRESET 0x00000006 /* perform core and system reset */
+#define SYSCTRL_VRCTL 0x00000010 /* read/write VR_CTL register */
+#define SYSCTRL_EXTVOLTAGE 0x00000020 /* VDDINT supplied externally */
+#define SYSCTRL_INTVOLTAGE 0x00000000 /* VDDINT generated by on-chip regulator */
+#define SYSCTRL_OTPVOLTAGE 0x00000040 /* For Factory Purposes Only */
+#define SYSCTRL_PLLCTL 0x00000100 /* read/write PLL_CTL register */
+#define SYSCTRL_PLLDIV 0x00000200 /* read/write PLL_DIV register */
+#define SYSCTRL_LOCKCNT 0x00000400 /* read/write PLL_LOCKCNT register */
+#define SYSCTRL_PLLSTAT 0x00000800 /* read/write PLL_STAT register */
+
+typedef struct ADI_SYSCTRL_VALUES {
+ uint16_t uwVrCtl;
+ uint16_t uwPllCtl;
+ uint16_t uwPllDiv;
+ uint16_t uwPllLockCnt;
+ uint16_t uwPllStat;
+} ADI_SYSCTRL_VALUES;
+
+static uint32_t (* const bfrom_SysControl)(uint32_t action_flags, ADI_SYSCTRL_VALUES *power_settings, void *reserved) = (void *)0xEF000038;
+
+/* We need a dedicated function since we need to screw with the stack pointer
+ * when resetting. The on-chip ROM will save/restore registers on the stack
+ * when doing a system reset, so the stack cannot be outside of the chip.
+ */
+__attribute__((__noreturn__))
+static inline void bfrom_SoftReset(void *new_stack)
+{
+ while (1)
+ __asm__ __volatile__(
+ "sp = %[stack];"
+ "jump (%[bfrom_syscontrol]);"
+ : : [bfrom_syscontrol] "p"(bfrom_SysControl),
+ "q0"(SYSCTRL_SOFTRESET),
+ "q1"(0),
+ "q2"(NULL),
+ [stack] "p"(new_stack)
+ );
+}
+
+/* OTP Functions */
+static uint32_t (* const bfrom_OtpCommand)(uint32_t command, uint32_t value) = (void *)0xEF000018;
+static uint32_t (* const bfrom_OtpRead)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)0xEF00001A;
+static uint32_t (* const bfrom_OtpWrite)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)0xEF00001C;
+
+/* otp command: defines for "command" */
+#define OTP_INIT 0x00000001
+#define OTP_CLOSE 0x00000002
+
+/* otp read/write: defines for "flags" */
+#define OTP_LOWER_HALF 0x00000000 /* select upper/lower 64-bit half (bit 0) */
+#define OTP_UPPER_HALF 0x00000001
+#define OTP_NO_ECC 0x00000010 /* do not use ECC */
+#define OTP_LOCK 0x00000020 /* sets page protection bit for page */
+#define OTP_CHECK_FOR_PREV_WRITE 0x00000080
+
+/* Return values for all functions */
+#define OTP_SUCCESS 0x00000000
+#define OTP_MASTER_ERROR 0x001
+#define OTP_WRITE_ERROR 0x003
+#define OTP_READ_ERROR 0x005
+#define OTP_ACC_VIO_ERROR 0x009
+#define OTP_DATA_MULT_ERROR 0x011
+#define OTP_ECC_MULT_ERROR 0x021
+#define OTP_PREV_WR_ERROR 0x041
+#define OTP_DATA_SB_WARN 0x100
+#define OTP_ECC_SB_WARN 0x200
+
+#endif
diff --git a/arch/blackfin/kernel/reboot.c b/arch/blackfin/kernel/reboot.c
index d0ead640d992..ae97ca407b0d 100644
--- a/arch/blackfin/kernel/reboot.c
+++ b/arch/blackfin/kernel/reboot.c
@@ -10,6 +10,7 @@
#include <asm/bfin-global.h>
#include <asm/reboot.h>
#include <asm/system.h>
+#include <asm/bfrom.h>
/* A system soft reset makes external memory unusable so force
* this function into L1. We use the compiler ssync here rather
@@ -74,7 +75,14 @@ void machine_restart(char *cmd)
{
native_machine_restart(cmd);
local_irq_disable();
- bfin_reset();
+ if (ANOMALY_05000353 || ANOMALY_05000386)
+ bfin_reset();
+ else
+ /* the bootrom checks to see how it was reset and will
+ * automatically perform a software reset for us when
+ * it starts executing boot
+ */
+ asm("raise 1;");
}
__attribute__((weak))
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