/* * 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 #include #ifndef CONFIG_UART_CONSOLE # define CONFIG_UART_CONSOLE 0 #endif #ifdef CONFIG_DEBUG_EARLY_SERIAL # define BFIN_DEBUG_EARLY_SERIAL 1 #else # define BFIN_DEBUG_EARLY_SERIAL 0 #endif #ifndef __ASSEMBLY__ #include #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. */ #define __BFP(m) u16 m; u16 __pad_##m struct bfin_mmr_serial { #ifdef __ADSPBF54x__ __BFP(dll); __BFP(dlh); __BFP(gctl); __BFP(lcr); __BFP(mcr); __BFP(lsr); __BFP(msr); __BFP(scr); __BFP(ier_set); __BFP(ier_clear); __BFP(thr); __BFP(rbr); #else union { u16 dll; u16 thr; const u16 rbr; }; const u16 __spad0; union { u16 dlh; u16 ier; }; const u16 __spad1; const __BFP(iir); __BFP(lcr); __BFP(mcr); __BFP(lsr); __BFP(msr); __BFP(scr); const u32 __spad2; __BFP(gctl); #endif }; #undef __BFP #ifndef UART_LSR # if (CONFIG_UART_CONSOLE == 3) # define UART_BASE UART3_DLL # elif (CONFIG_UART_CONSOLE == 2) # define UART_BASE UART2_DLL # elif (CONFIG_UART_CONSOLE == 1) # define UART_BASE UART1_DLL # elif (CONFIG_UART_CONSOLE == 0) # define UART_BASE UART0_DLL # endif #else # if CONFIG_UART_CONSOLE != 0 # error CONFIG_UART_CONSOLE must be 0 on parts with only one UART # endif # define UART_BASE UART_DLL #endif #define pUART ((volatile struct bfin_mmr_serial *)UART_BASE) #ifdef __ADSPBF54x__ # define ACCESS_LATCH() # define ACCESS_PORT_IER() #else # define ACCESS_LATCH() \ bfin_write16(&pUART->lcr, bfin_read16(&pUART->lcr) | DLAB) # define ACCESS_PORT_IER() \ bfin_write16(&pUART->lcr, bfin_read16(&pUART->lcr) & ~DLAB) #endif __attribute__((always_inline)) static inline void serial_do_portmux(void) { if (!BFIN_DEBUG_EARLY_SERIAL) { const unsigned short pins[] = { #if CONFIG_UART_CONSOLE == 0 P_UART0_TX, P_UART0_RX, #elif CONFIG_UART_CONSOLE == 1 P_UART1_TX, P_UART1_RX, #elif CONFIG_UART_CONSOLE == 2 P_UART2_TX, P_UART2_RX, #elif CONFIG_UART_CONSOLE == 3 P_UART3_TX, P_UART3_RX, #endif 0, }; peripheral_request_list(pins, "bfin-uart"); return; } #if defined(__ADSPBF51x__) # define DO_MUX(port, mux_tx, mux_rx, tx, rx) \ bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~(PORT_x_MUX_##mux_tx##_MASK | PORT_x_MUX_##mux_rx##_MASK)) | PORT_x_MUX_##mux_tx##_FUNC_2 | PORT_x_MUX_##mux_rx##_FUNC_2); \ 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, 5, 5, 9, 10); break; /* Port G; mux 5; PG9 and PG10 */ case 1: DO_MUX(F, 2, 3, 14, 15); break; /* Port H; mux 2/3; PH14 and PH15 */ } SSYNC(); #elif defined(__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(); /* always enable UART -- avoids anomalies 05000309 and 05000350 */ bfin_write16(&pUART->gctl, UCEN); /* Set LCR to Word Lengh 8-bit word select */ bfin_write16(&pUART->lcr, WLS_8); SSYNC(); } __attribute__((always_inline)) static inline void serial_early_put_div(uint16_t divisor) { /* Set DLAB in LCR to Access DLL and DLH */ ACCESS_LATCH(); SSYNC(); /* Program the divisor to get the baud rate we want */ bfin_write16(&pUART->dll, LOB(divisor)); bfin_write16(&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) { /* Set DLAB in LCR to Access DLL and DLH */ ACCESS_LATCH(); SSYNC(); uint8_t dll = bfin_read16(&pUART->dll); uint8_t dlh = bfin_read16(&pUART->dlh); uint16_t divisor = (dlh << 8) | dll; /* Clear DLAB in LCR to Access THR RBR IER */ ACCESS_PORT_IER(); SSYNC(); return divisor; } /* We cannot use get_sclk() early on as it uses caches in external memory */ #if defined(BFIN_IN_INITCODE) || defined(CONFIG_DEBUG_EARLY_SERIAL) # define get_sclk() (CONFIG_CLKIN_HZ * CONFIG_VCO_MULT / CONFIG_SCLK_DIV) #endif __attribute__((always_inline)) static inline void serial_early_set_baud(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. */ serial_early_put_div((get_sclk() + (baud * 8)) / (baud * 16) - ANOMALY_05000230); } #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 /* 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