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/*
* 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>
#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 <asm/portmux.h>
#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
#define __PASTE_UART(num, pfx, sfx) pfx##num##_##sfx
#define _PASTE_UART(num, pfx, sfx) __PASTE_UART(num, pfx, sfx)
#define MMR_UART(mmr) _PASTE_UART(CONFIG_UART_CONSOLE, UART, DLL)
#define P_UART(pin) _PASTE_UART(CONFIG_UART_CONSOLE, P_UART, pin)
#ifndef UART_DLL
# define UART_DLL MMR_UART(DLL)
#else
# if CONFIG_UART_CONSOLE != 0
# error CONFIG_UART_CONSOLE must be 0 on parts with only one UART
# endif
#endif
#define pUART ((volatile struct bfin_mmr_serial *)UART_DLL)
#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[] = { P_UART(RX), P_UART(TX), 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__)
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))));
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();
#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
}
__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
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