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Diffstat (limited to 'include/asm-v850/v850e_uartb.h')
| -rw-r--r-- | include/asm-v850/v850e_uartb.h | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/include/asm-v850/v850e_uartb.h b/include/asm-v850/v850e_uartb.h new file mode 100644 index 0000000..6d4767d --- /dev/null +++ b/include/asm-v850/v850e_uartb.h @@ -0,0 +1,262 @@ +/* + * include/asm-v850/v850e_uartb.h -- V850E on-chip `UARTB' UART + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +/* The V850E UARTB is basically a superset of the original V850E UART, but + even where it's the same, the names and details have changed a bit. + It's similar enough to use the same driver (v850e_uart.c), but the + details have been abstracted slightly to do so. */ + +#ifndef __V850_V850E_UARTB_H__ +#define __V850_V850E_UARTB_H__ + + +/* Raw hardware interface. */ + +#define V850E_UARTB_BASE_ADDR(n) (0xFFFFFA00 + 0x10 * (n)) + +/* Addresses of specific UART control registers for channel N. */ +#define V850E_UARTB_CTL0_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x0) +#define V850E_UARTB_CTL2_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x2) +#define V850E_UARTB_STR_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x4) +#define V850E_UARTB_RX_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x6) +#define V850E_UARTB_RXAP_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x6) +#define V850E_UARTB_TX_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x8) +#define V850E_UARTB_FIC0_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xA) +#define V850E_UARTB_FIC1_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xB) +#define V850E_UARTB_FIC2_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xC) +#define V850E_UARTB_FIS0_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xE) +#define V850E_UARTB_FIS1_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xF) + +/* UARTB control register 0 (general config). */ +#define V850E_UARTB_CTL0(n) (*(volatile u8 *)V850E_UARTB_CTL0_ADDR(n)) +/* Control bits for config registers. */ +#define V850E_UARTB_CTL0_PWR 0x80 /* clock enable */ +#define V850E_UARTB_CTL0_TXE 0x40 /* transmit enable */ +#define V850E_UARTB_CTL0_RXE 0x20 /* receive enable */ +#define V850E_UARTB_CTL0_DIR 0x10 /* */ +#define V850E_UARTB_CTL0_PS1 0x08 /* parity */ +#define V850E_UARTB_CTL0_PS0 0x04 /* parity */ +#define V850E_UARTB_CTL0_CL 0x02 /* char len 1:8bit, 0:7bit */ +#define V850E_UARTB_CTL0_SL 0x01 /* stop bit 1:2bit, 0:1bit */ +#define V850E_UARTB_CTL0_PS_MASK 0x0C /* mask covering parity bits */ +#define V850E_UARTB_CTL0_PS_NONE 0x00 /* no parity */ +#define V850E_UARTB_CTL0_PS_ZERO 0x04 /* zero parity */ +#define V850E_UARTB_CTL0_PS_ODD 0x08 /* odd parity */ +#define V850E_UARTB_CTL0_PS_EVEN 0x0C /* even parity */ +#define V850E_UARTB_CTL0_CL_8 0x02 /* char len 1:8bit, 0:7bit */ +#define V850E_UARTB_CTL0_SL_2 0x01 /* stop bit 1:2bit, 0:1bit */ + +/* UARTB control register 2 (clock divider). */ +#define V850E_UARTB_CTL2(n) (*(volatile u16 *)V850E_UARTB_CTL2_ADDR(n)) +#define V850E_UARTB_CTL2_MIN 4 +#define V850E_UARTB_CTL2_MAX 0xFFFF + +/* UARTB serial interface status register. */ +#define V850E_UARTB_STR(n) (*(volatile u8 *)V850E_UARTB_STR_ADDR(n)) +/* Control bits for status registers. */ +#define V850E_UARTB_STR_TSF 0x80 /* UBTX or FIFO exist data */ +#define V850E_UARTB_STR_OVF 0x08 /* overflow error */ +#define V850E_UARTB_STR_PE 0x04 /* parity error */ +#define V850E_UARTB_STR_FE 0x02 /* framing error */ +#define V850E_UARTB_STR_OVE 0x01 /* overrun error */ + +/* UARTB receive data register. */ +#define V850E_UARTB_RX(n) (*(volatile u8 *)V850E_UARTB_RX_ADDR(n)) +#define V850E_UARTB_RXAP(n) (*(volatile u16 *)V850E_UARTB_RXAP_ADDR(n)) +/* Control bits for status registers. */ +#define V850E_UARTB_RXAP_PEF 0x0200 /* parity error */ +#define V850E_UARTB_RXAP_FEF 0x0100 /* framing error */ + +/* UARTB transmit data register. */ +#define V850E_UARTB_TX(n) (*(volatile u8 *)V850E_UARTB_TX_ADDR(n)) + +/* UARTB FIFO control register 0. */ +#define V850E_UARTB_FIC0(n) (*(volatile u8 *)V850E_UARTB_FIC0_ADDR(n)) + +/* UARTB FIFO control register 1. */ +#define V850E_UARTB_FIC1(n) (*(volatile u8 *)V850E_UARTB_FIC1_ADDR(n)) + +/* UARTB FIFO control register 2. */ +#define V850E_UARTB_FIC2(n) (*(volatile u16 *)V850E_UARTB_FIC2_ADDR(n)) + +/* UARTB FIFO status register 0. */ +#define V850E_UARTB_FIS0(n) (*(volatile u8 *)V850E_UARTB_FIS0_ADDR(n)) + +/* UARTB FIFO status register 1. */ +#define V850E_UARTB_FIS1(n) (*(volatile u8 *)V850E_UARTB_FIS1_ADDR(n)) + + +/* Slightly abstract interface used by driver. */ + + +/* Interrupts used by the UART. */ + +/* Received when the most recently transmitted character has been sent. */ +#define V850E_UART_TX_IRQ(chan) IRQ_INTUBTIT (chan) +/* Received when a new character has been received. */ +#define V850E_UART_RX_IRQ(chan) IRQ_INTUBTIR (chan) + +/* Use by serial driver for information purposes. */ +#define V850E_UART_BASE_ADDR(chan) V850E_UARTB_BASE_ADDR(chan) + + +/* UART clock generator interface. */ + +/* This type encapsulates a particular uart frequency. */ +typedef u16 v850e_uart_speed_t; + +/* Calculate a uart speed from BAUD for this uart. */ +static inline v850e_uart_speed_t v850e_uart_calc_speed (unsigned baud) +{ + v850e_uart_speed_t speed; + + /* + * V850E/ME2 UARTB baud rate is determined by the value of UBCTL2 + * fx = V850E_UARTB_BASE_FREQ = CPU_CLOCK_FREQ/4 + * baud = fx / 2*speed [ speed >= 4 ] + */ + speed = V850E_UARTB_CTL2_MIN; + while (((V850E_UARTB_BASE_FREQ / 2) / speed ) > baud) + speed++; + + return speed; +} + +/* Return the current speed of uart channel CHAN. */ +#define v850e_uart_speed(chan) V850E_UARTB_CTL2 (chan) + +/* Set the current speed of uart channel CHAN. */ +#define v850e_uart_set_speed(chan, speed) (V850E_UARTB_CTL2 (chan) = (speed)) + +/* Return true if SPEED1 and SPEED2 are the same. */ +#define v850e_uart_speed_eq(speed1, speed2) ((speed1) == (speed2)) + +/* Minimum baud rate possible. */ +#define v850e_uart_min_baud() \ + ((V850E_UARTB_BASE_FREQ / 2) / V850E_UARTB_CTL2_MAX) + +/* Maximum baud rate possible. The error is quite high at max, though. */ +#define v850e_uart_max_baud() \ + ((V850E_UARTB_BASE_FREQ / 2) / V850E_UARTB_CTL2_MIN) + +/* The `maximum' clock rate the uart can used, which is wanted (though not + really used in any useful way) by the serial framework. */ +#define v850e_uart_max_clock() \ + (V850E_UARTB_BASE_FREQ / 2) + + +/* UART configuration interface. */ + +/* Type of the uart config register; must be a scalar. */ +typedef u16 v850e_uart_config_t; + +/* The uart hardware config register for channel CHAN. */ +#define V850E_UART_CONFIG(chan) V850E_UARTB_CTL0 (chan) + +/* This config bit set if the uart is enabled. */ +#define V850E_UART_CONFIG_ENABLED V850E_UARTB_CTL0_PWR +/* If the uart _isn't_ enabled, store this value to it to do so. */ +#define V850E_UART_CONFIG_INIT V850E_UARTB_CTL0_PWR +/* Store this config value to disable the uart channel completely. */ +#define V850E_UART_CONFIG_FINI 0 + +/* Setting/clearing these bits enable/disable TX/RX, respectively (but + otherwise generally leave things running). */ +#define V850E_UART_CONFIG_RX_ENABLE V850E_UARTB_CTL0_RXE +#define V850E_UART_CONFIG_TX_ENABLE V850E_UARTB_CTL0_TXE + +/* These masks define which config bits affect TX/RX modes, respectively. */ +#define V850E_UART_CONFIG_RX_BITS \ + (V850E_UARTB_CTL0_PS_MASK | V850E_UARTB_CTL0_CL_8) +#define V850E_UART_CONFIG_TX_BITS \ + (V850E_UARTB_CTL0_PS_MASK | V850E_UARTB_CTL0_CL_8 | V850E_UARTB_CTL0_SL_2) + +static inline v850e_uart_config_t v850e_uart_calc_config (unsigned cflags) +{ + v850e_uart_config_t config = 0; + + /* Figure out new configuration of control register. */ + if (cflags & CSTOPB) + /* Number of stop bits, 1 or 2. */ + config |= V850E_UARTB_CTL0_SL_2; + if ((cflags & CSIZE) == CS8) + /* Number of data bits, 7 or 8. */ + config |= V850E_UARTB_CTL0_CL_8; + if (! (cflags & PARENB)) + /* No parity check/generation. */ + config |= V850E_UARTB_CTL0_PS_NONE; + else if (cflags & PARODD) + /* Odd parity check/generation. */ + config |= V850E_UARTB_CTL0_PS_ODD; + else + /* Even parity check/generation. */ + config |= V850E_UARTB_CTL0_PS_EVEN; + if (cflags & CREAD) + /* Reading enabled. */ + config |= V850E_UARTB_CTL0_RXE; + + config |= V850E_UARTB_CTL0_PWR; + config |= V850E_UARTB_CTL0_TXE; /* Writing is always enabled. */ + config |= V850E_UARTB_CTL0_DIR; /* LSB first. */ + + return config; +} + +/* This should delay as long as necessary for a recently written config + setting to settle, before we turn the uart back on. */ +static inline void +v850e_uart_config_delay (v850e_uart_config_t config, v850e_uart_speed_t speed) +{ + /* The UART may not be reset properly unless we wait at least 2 + `basic-clocks' until turning on the TXE/RXE bits again. + A `basic clock' is the clock used by the baud-rate generator, + i.e., the cpu clock divided by the 2^new_clk_divlog2. + The loop takes 2 insns, so loop CYCLES / 2 times. */ + register unsigned count = 1 << speed; + while (--count != 0) + /* nothing */; +} + + +/* RX/TX interface. */ + +/* Return true if all characters awaiting transmission on uart channel N + have been transmitted. */ +#define v850e_uart_xmit_done(n) \ + (! (V850E_UARTB_STR(n) & V850E_UARTB_STR_TSF)) +/* Wait for this to be true. */ +#define v850e_uart_wait_for_xmit_done(n) \ + do { } while (! v850e_uart_xmit_done (n)) + +/* Return true if uart channel N is ready to transmit a character. */ +#define v850e_uart_xmit_ok(n) \ + (v850e_uart_xmit_done(n) && v850e_uart_cts(n)) +/* Wait for this to be true. */ +#define v850e_uart_wait_for_xmit_ok(n) \ + do { } while (! v850e_uart_xmit_ok (n)) + +/* Write character CH to uart channel CHAN. */ +#define v850e_uart_putc(chan, ch) (V850E_UARTB_TX(chan) = (ch)) + +/* Return latest character read on channel CHAN. */ +#define v850e_uart_getc(chan) V850E_UARTB_RX (chan) + +/* Return bit-mask of uart error status. */ +#define v850e_uart_err(chan) V850E_UARTB_STR (chan) +/* Various error bits set in the error result. */ +#define V850E_UART_ERR_OVERRUN V850E_UARTB_STR_OVE +#define V850E_UART_ERR_FRAME V850E_UARTB_STR_FE +#define V850E_UART_ERR_PARITY V850E_UARTB_STR_PE + + +#endif /* __V850_V850E_UARTB_H__ */ |