diff options
Diffstat (limited to 'include/asm-v850/v850e_uarta.h')
| -rw-r--r-- | include/asm-v850/v850e_uarta.h | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/include/asm-v850/v850e_uarta.h b/include/asm-v850/v850e_uarta.h deleted file mode 100644 index e483e095072..00000000000 --- a/include/asm-v850/v850e_uarta.h +++ /dev/null @@ -1,278 +0,0 @@ -/* - * include/asm-v850/v850e_uarta.h -- original V850E on-chip 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> - */ - -/* This is the original V850E UART implementation is called just `UART' in - the docs, but we name this header file <asm/v850e_uarta.h> because the - name <asm/v850e_uart.h> is used for the common driver that handles both - `UART' and `UARTB' implementations. */ - -#ifndef __V850_V850E_UARTA_H__ -#define __V850_V850E_UARTA_H__ - - -/* Raw hardware interface. */ - -/* The base address of the UART control registers for channel N. - The default is the address used on the V850E/MA1. */ -#ifndef V850E_UART_BASE_ADDR -#define V850E_UART_BASE_ADDR(n) (0xFFFFFA00 + 0x10 * (n)) -#endif - -/* Addresses of specific UART control registers for channel N. - The defaults are the addresses used on the V850E/MA1; if a platform - wants to redefine any of these, it must redefine them all. */ -#ifndef V850E_UART_ASIM_ADDR -#define V850E_UART_ASIM_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x0) -#define V850E_UART_RXB_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x2) -#define V850E_UART_ASIS_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x3) -#define V850E_UART_TXB_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x4) -#define V850E_UART_ASIF_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x5) -#define V850E_UART_CKSR_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x6) -#define V850E_UART_BRGC_ADDR(n) (V850E_UART_BASE_ADDR(n) + 0x7) -#endif - -/* UART config registers. */ -#define V850E_UART_ASIM(n) (*(volatile u8 *)V850E_UART_ASIM_ADDR(n)) -/* Control bits for config registers. */ -#define V850E_UART_ASIM_CAE 0x80 /* clock enable */ -#define V850E_UART_ASIM_TXE 0x40 /* transmit enable */ -#define V850E_UART_ASIM_RXE 0x20 /* receive enable */ -#define V850E_UART_ASIM_PS_MASK 0x18 /* mask covering parity-select bits */ -#define V850E_UART_ASIM_PS_NONE 0x00 /* no parity */ -#define V850E_UART_ASIM_PS_ZERO 0x08 /* zero parity */ -#define V850E_UART_ASIM_PS_ODD 0x10 /* odd parity */ -#define V850E_UART_ASIM_PS_EVEN 0x18 /* even parity */ -#define V850E_UART_ASIM_CL_8 0x04 /* char len is 8 bits (otherwise, 7) */ -#define V850E_UART_ASIM_SL_2 0x02 /* 2 stop bits (otherwise, 1) */ -#define V850E_UART_ASIM_ISRM 0x01 /* generate INTSR interrupt on errors - (otherwise, generate INTSER) */ - -/* UART serial interface status registers. */ -#define V850E_UART_ASIS(n) (*(volatile u8 *)V850E_UART_ASIS_ADDR(n)) -/* Control bits for status registers. */ -#define V850E_UART_ASIS_PE 0x04 /* parity error */ -#define V850E_UART_ASIS_FE 0x02 /* framing error */ -#define V850E_UART_ASIS_OVE 0x01 /* overrun error */ - -/* UART serial interface transmission status registers. */ -#define V850E_UART_ASIF(n) (*(volatile u8 *)V850E_UART_ASIF_ADDR(n)) -#define V850E_UART_ASIF_TXBF 0x02 /* transmit buffer flag (data in TXB) */ -#define V850E_UART_ASIF_TXSF 0x01 /* transmit shift flag (sending data) */ - -/* UART receive buffer register. */ -#define V850E_UART_RXB(n) (*(volatile u8 *)V850E_UART_RXB_ADDR(n)) - -/* UART transmit buffer register. */ -#define V850E_UART_TXB(n) (*(volatile u8 *)V850E_UART_TXB_ADDR(n)) - -/* UART baud-rate generator control registers. */ -#define V850E_UART_CKSR(n) (*(volatile u8 *)V850E_UART_CKSR_ADDR(n)) -#define V850E_UART_CKSR_MAX 11 -#define V850E_UART_BRGC(n) (*(volatile u8 *)V850E_UART_BRGC_ADDR(n)) -#define V850E_UART_BRGC_MIN 8 - - -#ifndef V850E_UART_CKSR_MAX_FREQ -#define V850E_UART_CKSR_MAX_FREQ (25*1000*1000) -#endif - -/* Calculate the minimum value for CKSR on this processor. */ -static inline unsigned v850e_uart_cksr_min (void) -{ - int min = 0; - unsigned freq = V850E_UART_BASE_FREQ; - while (freq > V850E_UART_CKSR_MAX_FREQ) { - freq >>= 1; - min++; - } - return min; -} - - -/* 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_INTST (chan) -/* Received when a new character has been received. */ -#define V850E_UART_RX_IRQ(chan) IRQ_INTSR (chan) - - -/* UART clock generator interface. */ - -/* This type encapsulates a particular uart frequency. */ -typedef struct { - unsigned clk_divlog2; - unsigned brgen_count; -} 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; - - /* Calculate the log2 clock divider and baud-rate counter values - (note that the UART divides the resulting clock by 2, so - multiply BAUD by 2 here to compensate). */ - calc_counter_params (V850E_UART_BASE_FREQ, baud * 2, - v850e_uart_cksr_min(), - V850E_UART_CKSR_MAX, 8/*bits*/, - &speed.clk_divlog2, &speed.brgen_count); - - return speed; -} - -/* Return the current speed of uart channel CHAN. */ -static inline v850e_uart_speed_t v850e_uart_speed (unsigned chan) -{ - v850e_uart_speed_t speed; - speed.clk_divlog2 = V850E_UART_CKSR (chan); - speed.brgen_count = V850E_UART_BRGC (chan); - return speed; -} - -/* Set the current speed of uart channel CHAN. */ -static inline void v850e_uart_set_speed(unsigned chan,v850e_uart_speed_t speed) -{ - V850E_UART_CKSR (chan) = speed.clk_divlog2; - V850E_UART_BRGC (chan) = speed.brgen_count; -} - -static inline int -v850e_uart_speed_eq (v850e_uart_speed_t speed1, v850e_uart_speed_t speed2) -{ - return speed1.clk_divlog2 == speed2.clk_divlog2 - && speed1.brgen_count == speed2.brgen_count; -} - -/* Minimum baud rate possible. */ -#define v850e_uart_min_baud() \ - ((V850E_UART_BASE_FREQ >> V850E_UART_CKSR_MAX) / (2 * 255) + 1) - -/* Maximum baud rate possible. The error is quite high at max, though. */ -#define v850e_uart_max_baud() \ - ((V850E_UART_BASE_FREQ >> v850e_uart_cksr_min()) / (2 *V850E_UART_BRGC_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_UART_BASE_FREQ >> v850e_uart_cksr_min()) / 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_UART_ASIM (chan) - -/* This config bit set if the uart is enabled. */ -#define V850E_UART_CONFIG_ENABLED V850E_UART_ASIM_CAE -/* If the uart _isn't_ enabled, store this value to it to do so. */ -#define V850E_UART_CONFIG_INIT V850E_UART_ASIM_CAE -/* 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_UART_ASIM_RXE -#define V850E_UART_CONFIG_TX_ENABLE V850E_UART_ASIM_TXE - -/* These masks define which config bits affect TX/RX modes, respectively. */ -#define V850E_UART_CONFIG_RX_BITS \ - (V850E_UART_ASIM_PS_MASK | V850E_UART_ASIM_CL_8 | V850E_UART_ASIM_ISRM) -#define V850E_UART_CONFIG_TX_BITS \ - (V850E_UART_ASIM_PS_MASK | V850E_UART_ASIM_CL_8 | V850E_UART_ASIM_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_UART_ASIM_SL_2; - if ((cflags & CSIZE) == CS8) - /* Number of data bits, 7 or 8. */ - config |= V850E_UART_ASIM_CL_8; - if (! (cflags & PARENB)) - /* No parity check/generation. */ - config |= V850E_UART_ASIM_PS_NONE; - else if (cflags & PARODD) - /* Odd parity check/generation. */ - config |= V850E_UART_ASIM_PS_ODD; - else - /* Even parity check/generation. */ - config |= V850E_UART_ASIM_PS_EVEN; - if (cflags & CREAD) - /* Reading enabled. */ - config |= V850E_UART_ASIM_RXE; - - config |= V850E_UART_ASIM_CAE; - config |= V850E_UART_ASIM_TXE; /* Writing is always enabled. */ - config |= V850E_UART_ASIM_ISRM; /* Errors generate a read-irq. */ - - 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.clk_divlog2; - 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_UART_ASIF(n) & V850E_UART_ASIF_TXBF)) -/* 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_UART_TXB(chan) = (ch)) - -/* Return latest character read on channel CHAN. */ -#define v850e_uart_getc(chan) V850E_UART_RXB (chan) - -/* Return bit-mask of uart error status. */ -#define v850e_uart_err(chan) V850E_UART_ASIS (chan) -/* Various error bits set in the error result. */ -#define V850E_UART_ERR_OVERRUN V850E_UART_ASIS_OVE -#define V850E_UART_ERR_FRAME V850E_UART_ASIS_FE -#define V850E_UART_ERR_PARITY V850E_UART_ASIS_PE - - -#endif /* __V850_V850E_UARTA_H__ */ |