blackfin: Correct early serial mess output in BYPASS boot mode.

The early serial should not be configured again in initcode() for BYPASS
boot mode and in start() for the other LDR boot modes.

In BYPASS boot mode, the start up code is located in Nor flash address other
than the DRAM address defined in link script. The code embedded string can't
be addressed by its compile time symbol. Calculate it according to the flash
offset.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>

4 files changed, 27 insertions, 3 deletions

diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c
index 5c12726..4b10b6c 100644
--- a/arch/blackfin/cpu/initcode.c
+++ b/arch/blackfin/cpu/initcode.c
@@ -193,10 +193,12 @@ static inline void serial_init(void)
 	}
 #endif
 
+#if CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS
 	if (BFIN_DEBUG_EARLY_SERIAL) {
 		serial_early_init(uart_base);
 		serial_early_set_baud(uart_base, CONFIG_BAUDRATE);
 	}
+#endif
 }
 
 __attribute__((always_inline))
diff --git a/arch/blackfin/cpu/serial.h b/arch/blackfin/cpu/serial.h
index 9200339..d67fd81 100644
--- a/arch/blackfin/cpu/serial.h
+++ b/arch/blackfin/cpu/serial.h
@@ -78,19 +78,31 @@ static inline void serial_early_puts(const char *s)
 #else
 
 .macro serial_early_init
-#ifdef CONFIG_DEBUG_EARLY_SERIAL
+#if defined(CONFIG_DEBUG_EARLY_SERIAL) && defined(BFIN_BOOT_BYPASS)
 	call _serial_initialize;
 #endif
 .endm
 
 .macro serial_early_set_baud
-#ifdef CONFIG_DEBUG_EARLY_SERIAL
+#if defined(CONFIG_DEBUG_EARLY_SERIAL) && defined(BFIN_BOOT_BYPASS)
 	R0.L = LO(CONFIG_BAUDRATE);
 	R0.H = HI(CONFIG_BAUDRATE);
 	call _serial_set_baud;
 #endif
 .endm
 
+#if CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS
+#define update_serial_early_string_addr \
+	R1.L = _start; \
+	R1.H = _start; \
+	R0 = R0 - R1; \
+	R1.L = 0; \
+	R1.H = 0x2000; \
+	R0 = R0 + R1;
+#else
+#define update_serial_early_string_addr
+#endif
+
 /* Since we embed the string right into our .text section, we need
  * to find its address.  We do this by getting our PC and adding 2
  * bytes (which is the length of the jump instruction).  Then we
@@ -108,6 +120,7 @@ static inline void serial_early_puts(const char *s)
 	.previous; \
 	R0.L = 7b; \
 	R0.H = 7b; \
+	update_serial_early_string_addr \
 	call _serial_puts;
 #else
 # define serial_early_puts(str)
diff --git a/arch/blackfin/cpu/serial1.h b/arch/blackfin/cpu/serial1.h
index 52f1c62..467d381 100644
--- a/arch/blackfin/cpu/serial1.h
+++ b/arch/blackfin/cpu/serial1.h
@@ -287,8 +287,13 @@ static inline void serial_early_set_baud(uint32_t uart_base, uint32_t baud)
 	 * weird multiplication is to make sure we over sample just
 	 * a little rather than under sample the incoming signals.
 	 */
+#if CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS
+	uint16_t divisor = (early_get_uart_clk() + baud * 8) / (baud * 16)
+			- ANOMALY_05000230;
+#else
 	uint16_t divisor = early_division(early_get_uart_clk() + (baud * 8),
 			baud * 16) - ANOMALY_05000230;
+#endif
 
 	serial_set_divisor(uart_base, divisor);
 }
diff --git a/arch/blackfin/include/asm/clock.h b/arch/blackfin/include/asm/clock.h
index df6cd68..f1fcd40 100644
--- a/arch/blackfin/include/asm/clock.h
+++ b/arch/blackfin/include/asm/clock.h
@@ -10,7 +10,7 @@
 #include <asm/blackfin.h>
 #ifdef PLL_CTL
 #include <asm/mach-common/bits/pll.h>
-# define pll_is_bypassed() (bfin_read_PLL_STAT() & DF)
+# define pll_is_bypassed() (bfin_read_PLL_CTL() & BYPASS)
 #else
 #include <asm/mach-common/bits/cgu.h>
 # define pll_is_bypassed() (bfin_read_CGU_STAT() & PLLBP)
@@ -55,7 +55,11 @@ static inline uint32_t early_get_uart_clk(void)
 	if (!pll_is_bypassed()) {
 		div = bfin_read_PLL_DIV();
 		ssel = (div & SSEL) >> SSEL_P;
+#if CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS
+		sclk = vco/ssel;
+#else
 		sclk = early_division(vco, ssel);
+#endif
 	}
 	uclk = sclk;
 #ifdef CGU_DIV