Merge branch 'master' of git://www.denx.de/git/u-boot-blackfin

1 files changed, 275 insertions, 0 deletions

diff --git a/cpu/blackfin/serial.h b/cpu/blackfin/serial.h
new file mode 100644
index 0000000000..1f0f4b46c7
--- /dev/null
+++ b/cpu/blackfin/serial.h
@@ -0,0 +1,275 @@
+/*
+ * serial.h - common serial defines for early debug and serial driver.
+ *            any functions defined here must be always_inline since
+ *            initcode cannot have function calls.
+ *
+ * Copyright (c) 2004-2007 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __BFIN_CPU_SERIAL_H__
+#define __BFIN_CPU_SERIAL_H__
+
+#include <asm/blackfin.h>
+#include <asm/mach-common/bits/uart.h>
+
+#ifdef CONFIG_DEBUG_EARLY_SERIAL
+# define BFIN_DEBUG_EARLY_SERIAL 1
+#else
+# define BFIN_DEBUG_EARLY_SERIAL 0
+#endif
+
+#define LOB(x) ((x) & 0xFF)
+#define HIB(x) (((x) >> 8) & 0xFF)
+
+#ifndef UART_LSR
+# if (CONFIG_UART_CONSOLE == 3)
+#  define pUART_DLH  pUART3_DLH
+#  define pUART_DLL  pUART3_DLL
+#  define pUART_GCTL pUART3_GCTL
+#  define pUART_IER  pUART3_IER
+#  define pUART_IERC pUART3_IER_CLEAR
+#  define pUART_LCR  pUART3_LCR
+#  define pUART_LSR  pUART3_LSR
+#  define pUART_RBR  pUART3_RBR
+#  define pUART_THR  pUART3_THR
+#  define  UART_THR   UART3_THR
+#  define  UART_LSR   UART3_LSR
+# elif (CONFIG_UART_CONSOLE == 2)
+#  define pUART_DLH  pUART2_DLH
+#  define pUART_DLL  pUART2_DLL
+#  define pUART_GCTL pUART2_GCTL
+#  define pUART_IER  pUART2_IER
+#  define pUART_IERC pUART2_IER_CLEAR
+#  define pUART_LCR  pUART2_LCR
+#  define pUART_LSR  pUART2_LSR
+#  define pUART_RBR  pUART2_RBR
+#  define pUART_THR  pUART2_THR
+#  define  UART_THR   UART2_THR
+#  define  UART_LSR   UART2_LSR
+# elif (CONFIG_UART_CONSOLE == 1)
+#  define pUART_DLH  pUART1_DLH
+#  define pUART_DLL  pUART1_DLL
+#  define pUART_GCTL pUART1_GCTL
+#  define pUART_IER  pUART1_IER
+#  define pUART_IERC pUART1_IER_CLEAR
+#  define pUART_LCR  pUART1_LCR
+#  define pUART_LSR  pUART1_LSR
+#  define pUART_RBR  pUART1_RBR
+#  define pUART_THR  pUART1_THR
+#  define  UART_THR   UART1_THR
+#  define  UART_LSR   UART1_LSR
+# elif (CONFIG_UART_CONSOLE == 0)
+#  define pUART_DLH  pUART0_DLH
+#  define pUART_DLL  pUART0_DLL
+#  define pUART_GCTL pUART0_GCTL
+#  define pUART_IER  pUART0_IER
+#  define pUART_IERC pUART0_IER_CLEAR
+#  define pUART_LCR  pUART0_LCR
+#  define pUART_LSR  pUART0_LSR
+#  define pUART_RBR  pUART0_RBR
+#  define pUART_THR  pUART0_THR
+#  define  UART_THR   UART0_THR
+#  define  UART_LSR   UART0_LSR
+# endif
+#endif
+
+#ifndef __ASSEMBLY__
+
+/* We cannot use get_sclk() in initcode as it is defined elsewhere. */
+#ifdef BFIN_IN_INITCODE
+# define get_sclk() (CONFIG_CLKIN_HZ * CONFIG_VCO_MULT / CONFIG_SCLK_DIV)
+#endif
+
+#ifdef __ADSPBF54x__
+# define ACCESS_LATCH()
+# define ACCESS_PORT_IER()
+# define CLEAR_IER()       (*pUART_IERC = 0)
+#else
+# define ACCESS_LATCH()    (*pUART_LCR |= DLAB)
+# define ACCESS_PORT_IER() (*pUART_LCR &= ~DLAB)
+# define CLEAR_IER()       (*pUART_IER = 0)
+#endif
+
+__attribute__((always_inline))
+static inline void serial_do_portmux(void)
+{
+#ifdef __ADSPBF52x__
+# define DO_MUX(port, mux, tx, rx) \
+	bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~PORT_x_MUX_##mux##_MASK) | PORT_x_MUX_##mux##_FUNC_3); \
+	bfin_write_PORT##port##_FER(bfin_read_PORT##port##_FER() | P##port##tx | P##port##rx);
+	switch (CONFIG_UART_CONSOLE) {
+	case 0: DO_MUX(G, 2, 7, 8);   break;	/* Port G; mux 2; PG2 and PG8 */
+	case 1: DO_MUX(F, 5, 14, 15); break;	/* Port F; mux 5; PF14 and PF15 */
+	}
+	SSYNC();
+#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
+# define DO_MUX(func, tx, rx) \
+	bfin_write_PORT_MUX(bfin_read_PORT_MUX() & ~(func)); \
+	bfin_write_PORTF_FER(bfin_read_PORTF_FER() | PF##tx | PF##rx);
+	switch (CONFIG_UART_CONSOLE) {
+	case 0: DO_MUX(PFDE, 0, 1); break;
+	case 1: DO_MUX(PFTE, 2, 3); break;
+	}
+	SSYNC();
+#elif defined(__ADSPBF54x__)
+# define DO_MUX(port, tx, rx) \
+	bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~(PORT_x_MUX_##tx##_MASK | PORT_x_MUX_##rx##_MASK)) | PORT_x_MUX_##tx##_FUNC_1 | PORT_x_MUX_##rx##_FUNC_1); \
+	bfin_write_PORT##port##_FER(bfin_read_PORT##port##_FER() | P##port##tx | P##port##rx);
+	switch (CONFIG_UART_CONSOLE) {
+	case 0: DO_MUX(E, 7, 8); break;	/* Port E; PE7 and PE8 */
+	case 1: DO_MUX(H, 0, 1); break;	/* Port H; PH0 and PH1 */
+	case 2: DO_MUX(B, 4, 5); break;	/* Port B; PB4 and PB5 */
+	case 3: DO_MUX(B, 6, 7); break;	/* Port B; PB6 and PB7 */
+	}
+	SSYNC();
+#endif
+}
+
+__attribute__((always_inline))
+static inline void serial_early_init(void)
+{
+	/* handle portmux crap on different Blackfins */
+	serial_do_portmux();
+
+	/* Enable UART */
+	*pUART_GCTL = UCEN;
+
+	/* Set LCR to Word Lengh 8-bit word select */
+	*pUART_LCR = WLS_8;
+
+	SSYNC();
+}
+
+__attribute__((always_inline))
+static inline uint32_t serial_early_get_baud(void)
+{
+	/* If the UART isnt enabled, then we are booting an LDR
+	 * from a non-UART source (so like flash) which means
+	 * the baud rate here is meaningless.
+	 */
+	if ((*pUART_GCTL & UCEN) != UCEN)
+		return 0;
+
+#if (0)	/* See comment for serial_reset_baud() in initcode.c */
+	/* Set DLAB in LCR to Access DLL and DLH */
+	ACCESS_LATCH();
+	SSYNC();
+
+	uint8_t dll = *pUART_DLL;
+	uint8_t dlh = *pUART_DLH;
+	uint16_t divisor = (dlh << 8) | dll;
+	uint32_t baud = get_sclk() / (divisor * 16);
+
+	/* Clear DLAB in LCR to Access THR RBR IER */
+	ACCESS_PORT_IER();
+	SSYNC();
+
+	return baud;
+#else
+	return CONFIG_BAUDRATE;
+#endif
+}
+
+__attribute__((always_inline))
+static inline void serial_early_set_baud(uint32_t baud)
+{
+	/* Translate from baud into divisor in terms of SCLK.
+	 * The +1 is to make sure we over sample just a little
+	 * rather than under sample the incoming signals.
+	 */
+	uint16_t divisor = (get_sclk() / (baud * 16)) + 1;
+
+	/* Set DLAB in LCR to Access DLL and DLH */
+	ACCESS_LATCH();
+	SSYNC();
+
+	/* Program the divisor to get the baud rate we want */
+	*pUART_DLL = LOB(divisor);
+	*pUART_DLH = HIB(divisor);
+	SSYNC();
+
+	/* Clear DLAB in LCR to Access THR RBR IER */
+	ACCESS_PORT_IER();
+	SSYNC();
+}
+
+#ifndef BFIN_IN_INITCODE
+__attribute__((always_inline))
+static inline void serial_early_puts(const char *s)
+{
+	if (BFIN_DEBUG_EARLY_SERIAL) {
+		serial_puts("Early: ");
+		serial_puts(s);
+	}
+}
+#endif
+
+#else
+
+.macro serial_early_init
+#ifdef CONFIG_DEBUG_EARLY_SERIAL
+	call _serial_initialize;
+#endif
+.endm
+
+.macro serial_early_set_baud
+#ifdef CONFIG_DEBUG_EARLY_SERIAL
+	R0.L = LO(CONFIG_BAUDRATE);
+	R0.H = HI(CONFIG_BAUDRATE);
+	call _serial_set_baud;
+#endif
+.endm
+
+/* Recursively expand calls to _serial_putc for every byte
+ * passed to us.  Append a newline when we're all done.
+ */
+.macro _serial_early_putc byte:req morebytes:vararg
+#ifdef CONFIG_DEBUG_EARLY_SERIAL
+	R0 = \byte;
+	call _serial_putc;
+.ifnb \morebytes
+	_serial_early_putc \morebytes
+.else
+.if (\byte != '\n')
+	_serial_early_putc '\n'
+.endif
+.endif
+#endif
+.endm
+
+/* Wrapper around recurisve _serial_early_putc macro which
+ * simply prepends the string "Early: "
+ */
+.macro serial_early_putc byte:req morebytes:vararg
+#ifdef CONFIG_DEBUG_EARLY_SERIAL
+	_serial_early_putc 'E', 'a', 'r', 'l', 'y', ':', ' ', \byte, \morebytes
+#endif
+.endm
+
+/* 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
+ * pass this address to serial_puts().
+ */
+#ifdef CONFIG_DEBUG_EARLY_SERIAL
+# define serial_early_puts(str) \
+	call _get_pc; \
+	jump 1f; \
+	.ascii "Early:"; \
+	.ascii __FILE__; \
+	.ascii ": "; \
+	.ascii str; \
+	.asciz "\n"; \
+	.align 4; \
+1: \
+	R0 += 2; \
+	call _serial_puts;
+#else
+# define serial_early_puts(str)
+#endif
+
+#endif
+
+#endif