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-rw-r--r--arch/blackfin/cpu/serial4.h161
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/serial4.h b/arch/blackfin/cpu/serial4.h
new file mode 100644
index 0000000000..887845c186
--- /dev/null
+++ b/arch/blackfin/cpu/serial4.h
@@ -0,0 +1,161 @@
+/*
+ * 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_SERIAL4_H__
+#define __BFIN_CPU_SERIAL4_H__
+
+#include <asm/mach-common/bits/uart4.h>
+
+#ifndef __ASSEMBLY__
+
+#define MMR_UART(n) _PASTE_UART(n, UART, REVID)
+#define UART_BASE MMR_UART(CONFIG_UART_CONSOLE)
+
+struct bfin_mmr_serial {
+ u32 revid;
+ u32 control;
+ u32 status;
+ u32 scr;
+ u32 clock;
+ u32 emask;
+ u32 emaskst;
+ u32 emaskcl;
+ u32 rbr;
+ u32 thr;
+ u32 taip;
+ u32 tsr;
+ u32 rsr;
+ u32 txdiv_cnt;
+ u32 rxdiv_cnt;
+};
+#define uart_lsr_t uint32_t
+#define _lsr_read(p) bfin_read(&p->status)
+#define _lsr_write(p, v) bfin_write(&p->status, v)
+
+__attribute__((always_inline))
+static inline void serial_early_do_mach_portmux(char port, int mux_mask,
+ int mux_func, int port_pin)
+{
+ switch (port) {
+ case 'D':
+ bfin_write_PORTD_MUX((bfin_read_PORTD_MUX() &
+ ~mux_mask) | mux_func);
+ bfin_write_PORTD_FER_SET(port_pin);
+ break;
+ case 'G':
+ bfin_write_PORTG_MUX((bfin_read_PORTG_MUX() &
+ ~mux_mask) | mux_func);
+ bfin_write_PORTG_FER_SET(port_pin);
+ break;
+ }
+}
+
+__attribute__((always_inline))
+static inline void serial_early_do_portmux(void)
+{
+#if defined(__ADSPBF60x__)
+ switch (CONFIG_UART_CONSOLE) {
+ case 0:
+ serial_early_do_mach_portmux('D', PORT_x_MUX_7_MASK,
+ PORT_x_MUX_7_FUNC_2, PD7); /* TX: D; mux 7; func 2; PD7 */
+ serial_early_do_mach_portmux('D', PORT_x_MUX_8_MASK,
+ PORT_x_MUX_8_FUNC_2, PD8); /* RX: D; mux 8; func 2; PD8 */
+ break;
+ case 1:
+ serial_early_do_mach_portmux('G', PORT_x_MUX_15_MASK,
+ PORT_x_MUX_15_FUNC_1, PG15); /* TX: G; mux 15; func 1; PG15 */
+ serial_early_do_mach_portmux('G', PORT_x_MUX_14_MASK,
+ PORT_x_MUX_14_FUNC_1, PG14); /* RX: G; mux 14; func 1; PG14 */
+ break;
+ }
+#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 /
+ CONFIG_SCLK0_DIV;
+#else
+ return get_sclk0();
+#endif
+}
+
+__attribute__((always_inline))
+static inline int uart_init(uint32_t uart_base)
+{
+ /* always enable UART to 8-bit mode */
+ bfin_write(&pUART->control, UEN | UMOD_UART | 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 UEN */
+ bfin_write(&pUART->control, 0);
+
+ return 0;
+}
+
+__attribute__((always_inline))
+static inline int serial_early_enabled(uint32_t uart_base)
+{
+ return bfin_read(&pUART->control) & UEN;
+}
+
+__attribute__((always_inline))
+static inline void serial_early_set_baud(uint32_t uart_base, uint32_t baud)
+{
+ uint32_t divisor = uart_sclk() / (baud * 16);
+
+ /* Program the divisor to get the baud rate we want */
+ bfin_write(&pUART->clock, divisor);
+ SSYNC();
+}
+
+__attribute__((always_inline))
+static inline void serial_early_put_div(uint32_t divisor)
+{
+ uint32_t uart_base = UART_BASE;
+ bfin_write(&pUART->clock, divisor);
+}
+
+__attribute__((always_inline))
+static inline uint32_t serial_early_get_div(void)
+{
+ uint32_t uart_base = UART_BASE;
+ return bfin_read(&pUART->clock);
+}
+
+#endif
+
+#endif