blackfin: bf60x: add serial support

Add serial for bf60x.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>

1 files changed, 348 insertions, 0 deletions

diff --git a/arch/blackfin/cpu/serial1.h b/arch/blackfin/cpu/serial1.h
new file mode 100644
index 0000000..a20175b
--- /dev/null
+++ b/arch/blackfin/cpu/serial1.h
@@ -0,0 +1,348 @@
+/*
+ * 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) 2004-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __BFIN_CPU_SERIAL1_H__
+#define __BFIN_CPU_SERIAL1_H__
+
+#include <asm/mach-common/bits/uart.h>
+
+#ifndef __ASSEMBLY__
+
+#define MMR_UART(n) _PASTE_UART(n, UART, DLL)
+#ifdef UART_DLL
+# define UART0_DLL UART_DLL
+# if CONFIG_UART_CONSOLE != 0
+#  error CONFIG_UART_CONSOLE must be 0 on parts with only one UART
+# endif
+#endif
+#define UART_BASE MMR_UART(CONFIG_UART_CONSOLE)
+
+#define LOB(x) ((x) & 0xFF)
+#define HIB(x) (((x) >> 8) & 0xFF)
+
+/*
+ * All Blackfin system MMRs are padded to 32bits even if the register
+ * itself is only 16bits.  So use a helper macro to streamline this.
+ */
+struct bfin_mmr_serial {
+#if BFIN_UART_HW_VER == 2
+	u16 dll;
+	u16 __pad_0;
+	u16 dlh;
+	u16 __pad_1;
+	u16 gctl;
+	u16 __pad_2;
+	u16 lcr;
+	u16 __pad_3;
+	u16 mcr;
+	u16 __pad_4;
+	u16 lsr;
+	u16 __pad_5;
+	u16 msr;
+	u16 __pad_6;
+	u16 scr;
+	u16 __pad_7;
+	u16 ier_set;
+	u16 __pad_8;
+	u16 ier_clear;
+	u16 __pad_9;
+	u16 thr;
+	u16 __pad_10;
+	u16 rbr;
+	u16 __pad_11;
+#else
+	union {
+		u16 dll;
+		u16 thr;
+		const u16 rbr;
+	};
+	const u16 __spad0;
+	union {
+		u16 dlh;
+		u16 ier;
+	};
+	const u16 __spad1;
+	const u16 iir;
+	u16 __pad_0;
+	u16 lcr;
+	u16 __pad_1;
+	u16 mcr;
+	u16 __pad_2;
+	u16 lsr;
+	u16 __pad_3;
+	u16 msr;
+	u16 __pad_4;
+	u16 scr;
+	u16 __pad_5;
+	const u32 __spad2;
+	u16 gctl;
+	u16 __pad_6;
+#endif
+};
+
+#define uart_lsr_t uint32_t
+#define _lsr_read(p)     bfin_read(&p->lsr)
+#define _lsr_write(p, v) bfin_write(&p->lsr, v)
+
+#if BFIN_UART_HW_VER == 2
+# define ACCESS_LATCH()
+# define ACCESS_PORT_IER()
+#else
+# define ACCESS_LATCH()    bfin_write_or(&pUART->lcr, DLAB)
+# define ACCESS_PORT_IER() bfin_write_and(&pUART->lcr, ~DLAB)
+#endif
+
+__attribute__((always_inline))
+static inline void serial_early_do_mach_portmux(char port, int mux_mask,
+	int mux_func, int port_pin)
+{
+	switch (port) {
+#if defined(__ADSPBF54x__)
+	case 'B':
+		bfin_write_PORTB_MUX((bfin_read_PORTB_MUX() &
+			~mux_mask) | mux_func);
+		bfin_write_PORTB_FER(bfin_read_PORTB_FER() | port_pin);
+		break;
+	case 'E':
+		bfin_write_PORTE_MUX((bfin_read_PORTE_MUX() &
+			~mux_mask) | mux_func);
+		bfin_write_PORTE_FER(bfin_read_PORTE_FER() | port_pin);
+		break;
+#endif
+#if defined(__ADSPBF50x__) || defined(__ADSPBF51x__) || defined(__ADSPBF52x__)
+	case 'F':
+		bfin_write_PORTF_MUX((bfin_read_PORTF_MUX() &
+			~mux_mask) | mux_func);
+		bfin_write_PORTF_FER(bfin_read_PORTF_FER() | port_pin);
+		break;
+	case 'G':
+		bfin_write_PORTG_MUX((bfin_read_PORTG_MUX() &
+			~mux_mask) | mux_func);
+		bfin_write_PORTG_FER(bfin_read_PORTG_FER() | port_pin);
+		break;
+	case 'H':
+		bfin_write_PORTH_MUX((bfin_read_PORTH_MUX() &
+			~mux_mask) | mux_func);
+		bfin_write_PORTH_FER(bfin_read_PORTH_FER() | port_pin);
+		break;
+#endif
+	default:
+		break;
+	}
+}
+
+__attribute__((always_inline))
+static inline void serial_early_do_portmux(void)
+{
+#if defined(__ADSPBF50x__)
+	switch (CONFIG_UART_CONSOLE) {
+	case 0:
+		serial_early_do_mach_portmux('G', PORT_x_MUX_7_MASK,
+		PORT_x_MUX_7_FUNC_1, PG12); /* TX: G; mux 7; func 1; PG12 */
+		serial_early_do_mach_portmux('G', PORT_x_MUX_7_MASK,
+		PORT_x_MUX_7_FUNC_1, PG13); /* RX: G; mux 7; func 1; PG13 */
+		break;
+	case 1:
+		serial_early_do_mach_portmux('F', PORT_x_MUX_3_MASK,
+		PORT_x_MUX_3_FUNC_1, PF7); /* TX: F; mux 3; func 1; PF6 */
+		serial_early_do_mach_portmux('F', PORT_x_MUX_3_MASK,
+		PORT_x_MUX_3_FUNC_1, PF6); /* RX: F; mux 3; func 1; PF7 */
+		break;
+	}
+#elif defined(__ADSPBF51x__)
+	switch (CONFIG_UART_CONSOLE) {
+	case 0:
+		serial_early_do_mach_portmux('G', PORT_x_MUX_5_MASK,
+		PORT_x_MUX_5_FUNC_2, PG9); /* TX: G; mux 5; func 2; PG9 */
+		serial_early_do_mach_portmux('G', PORT_x_MUX_5_MASK,
+		PORT_x_MUX_5_FUNC_2, PG10); /* RX: G; mux 5; func 2; PG10 */
+		break;
+	case 1:
+		serial_early_do_mach_portmux('H', PORT_x_MUX_3_MASK,
+		PORT_x_MUX_3_FUNC_2, PH7); /* TX: H; mux 3; func 2; PH6 */
+		serial_early_do_mach_portmux('H', PORT_x_MUX_3_MASK,
+		PORT_x_MUX_3_FUNC_2, PH6); /* RX: H; mux 3; func 2; PH7 */
+		break;
+	}
+#elif defined(__ADSPBF52x__)
+	switch (CONFIG_UART_CONSOLE) {
+	case 0:
+		serial_early_do_mach_portmux('G', PORT_x_MUX_2_MASK,
+		PORT_x_MUX_2_FUNC_3, PG7); /* TX: G; mux 2; func 3; PG7 */
+		serial_early_do_mach_portmux('G', PORT_x_MUX_2_MASK,
+		PORT_x_MUX_2_FUNC_3, PG8); /* RX: G; mux 2; func 3; PG8 */
+		break;
+	case 1:
+		serial_early_do_mach_portmux('F', PORT_x_MUX_5_MASK,
+		PORT_x_MUX_5_FUNC_3, PF14); /* TX: F; mux 5; func 3; PF14 */
+		serial_early_do_mach_portmux('F', PORT_x_MUX_5_MASK,
+		PORT_x_MUX_5_FUNC_3, PF15); /* RX: F; mux 5; func 3; PF15 */
+		break;
+	}
+#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
+	const uint16_t func[] = { PFDE, PFTE, };
+	bfin_write_PORT_MUX(bfin_read_PORT_MUX() & ~func[CONFIG_UART_CONSOLE]);
+	bfin_write_PORTF_FER(bfin_read_PORTF_FER() |
+			(1 << P_IDENT(P_UART(RX))) |
+			(1 << P_IDENT(P_UART(TX))));
+#elif defined(__ADSPBF54x__)
+	switch (CONFIG_UART_CONSOLE) {
+	case 0:
+		serial_early_do_mach_portmux('E', PORT_x_MUX_7_MASK,
+		PORT_x_MUX_7_FUNC_1, PE7); /* TX: E; mux 7; func 1; PE7 */
+		serial_early_do_mach_portmux('E', PORT_x_MUX_8_MASK,
+		PORT_x_MUX_8_FUNC_1, PE8); /* RX: E; mux 8; func 1; PE8 */
+		break;
+	case 1:
+		serial_early_do_mach_portmux('H', PORT_x_MUX_0_MASK,
+		PORT_x_MUX_0_FUNC_1, PH0); /* TX: H; mux 0; func 1; PH0 */
+		serial_early_do_mach_portmux('H', PORT_x_MUX_1_MASK,
+		PORT_x_MUX_1_FUNC_1, PH1); /* RX: H; mux 1; func 1; PH1 */
+		break;
+	case 2:
+		serial_early_do_mach_portmux('B', PORT_x_MUX_4_MASK,
+		PORT_x_MUX_4_FUNC_1, PB4); /* TX: B; mux 4; func 1; PB4 */
+		serial_early_do_mach_portmux('B', PORT_x_MUX_5_MASK,
+		PORT_x_MUX_5_FUNC_1, PB5); /* RX: B; mux 5; func 1; PB5 */
+		break;
+	case 3:
+		serial_early_do_mach_portmux('B', PORT_x_MUX_6_MASK,
+		PORT_x_MUX_6_FUNC_1, PB6); /* TX: B; mux 6; func 1; PB6 */
+		serial_early_do_mach_portmux('B', PORT_x_MUX_7_MASK,
+		PORT_x_MUX_7_FUNC_1, PB7); /* RX: B; mux 7; func 1; PB7 */
+		break;
+	}
+#elif defined(__ADSPBF561__)
+	/* UART pins could be GPIO, but they aren't pin muxed.  */
+#else
+# if (P_UART(RX) & P_DEFINED) || (P_UART(TX) & P_DEFINED)
+#  error "missing portmux logic for UART"
+# endif
+#endif
+	SSYNC();
+}
+
+__attribute__((always_inline))
+static inline uint32_t uart_sclk(void)
+{
+#if defined(BFIN_IN_INITCODE) || defined(CONFIG_DEBUG_EARLY_SERIAL)
+	/* We cannot use get_sclk() early on as it uses
+	 * caches in external memory
+	 */
+	return CONFIG_CLKIN_HZ * CONFIG_VCO_MULT / CONFIG_SCLK_DIV;
+#else
+	return get_sclk();
+#endif
+}
+
+__attribute__((always_inline))
+static inline int uart_init(uint32_t uart_base)
+{
+	/* always enable UART -- avoids anomalies 05000309 and 05000350 */
+	bfin_write(&pUART->gctl, UCEN);
+
+	/* Set LCR to Word Lengh 8-bit word select */
+	bfin_write(&pUART->lcr, WLS_8);
+
+	SSYNC();
+
+	return 0;
+}
+
+__attribute__((always_inline))
+static inline int serial_early_init(uint32_t uart_base)
+{
+	/* handle portmux crap on different Blackfins */
+	serial_do_portmux();
+
+	return uart_init(uart_base);
+}
+
+__attribute__((always_inline))
+static inline int serial_early_uninit(uint32_t uart_base)
+{
+	/* disable the UART by clearing UCEN */
+	bfin_write(&pUART->gctl, 0);
+
+	return 0;
+}
+
+__attribute__((always_inline))
+static inline int serial_early_enabled(uint32_t uart_base)
+{
+	return bfin_read(&pUART->gctl) & UCEN;
+}
+
+__attribute__((always_inline))
+static inline void serial_early_set_baud(uint32_t uart_base, uint32_t baud)
+{
+	/* Translate from baud into divisor in terms of SCLK.  The
+	 * weird multiplication is to make sure we over sample just
+	 * a little rather than under sample the incoming signals.
+	 */
+	uint16_t divisor = (uart_sclk() + (baud * 8)) / (baud * 16) -
+			ANOMALY_05000230;
+
+	/* Set DLAB in LCR to Access DLL and DLH */
+	ACCESS_LATCH();
+	SSYNC();
+
+	/* Program the divisor to get the baud rate we want */
+	bfin_write(&pUART->dll, LOB(divisor));
+	bfin_write(&pUART->dlh, HIB(divisor));
+	SSYNC();
+
+	/* Clear DLAB in LCR to Access THR RBR IER */
+	ACCESS_PORT_IER();
+	SSYNC();
+}
+
+__attribute__((always_inline))
+static inline void serial_early_put_div(uint16_t divisor)
+{
+	uint32_t uart_base = UART_BASE;
+
+	/* Set DLAB in LCR to Access DLL and DLH */
+	ACCESS_LATCH();
+	SSYNC();
+
+	/* Program the divisor to get the baud rate we want */
+	bfin_write(&pUART->dll, LOB(divisor));
+	bfin_write(&pUART->dlh, HIB(divisor));
+	SSYNC();
+
+	/* Clear DLAB in LCR to Access THR RBR IER */
+	ACCESS_PORT_IER();
+	SSYNC();
+}
+
+__attribute__((always_inline))
+static inline uint16_t serial_early_get_div(void)
+{
+	uint32_t uart_base = UART_BASE;
+
+	/* Set DLAB in LCR to Access DLL and DLH */
+	ACCESS_LATCH();
+	SSYNC();
+
+	uint8_t dll = bfin_read(&pUART->dll);
+	uint8_t dlh = bfin_read(&pUART->dlh);
+	uint16_t divisor = (dlh << 8) | dll;
+
+	/* Clear DLAB in LCR to Access THR RBR IER */
+	ACCESS_PORT_IER();
+	SSYNC();
+
+	return divisor;
+}
+
+#endif
+
+#endif