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linux/include/asm-v850/v850e_uartb.h

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/*
* 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__ */
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