1/* 2 * Blackfin On-Chip Sport Emulated UART Driver 3 * 4 * Copyright 2006-2008 Analog Devices Inc. 5 * 6 * Enter bugs at http://blackfin.uclinux.org/ 7 * 8 * Licensed under the GPL-2 or later. 9 */ 10 11/* 12 * This driver and the hardware supported are in term of EE-191 of ADI. 13 * http://www.analog.com/static/imported-files/application_notes/EE191.pdf 14 * This application note describe how to implement a UART on a Sharc DSP, 15 * but this driver is implemented on Blackfin Processor. 16 * Transmit Frame Sync is not used by this driver to transfer data out. 17 */ 18 19#ifndef _BFIN_SPORT_UART_H 20#define _BFIN_SPORT_UART_H 21 22#define OFFSET_TCR1 0x00 /* Transmit Configuration 1 Register */ 23#define OFFSET_TCR2 0x04 /* Transmit Configuration 2 Register */ 24#define OFFSET_TCLKDIV 0x08 /* Transmit Serial Clock Divider Register */ 25#define OFFSET_TFSDIV 0x0C /* Transmit Frame Sync Divider Register */ 26#define OFFSET_TX 0x10 /* Transmit Data Register */ 27#define OFFSET_RX 0x18 /* Receive Data Register */ 28#define OFFSET_RCR1 0x20 /* Receive Configuration 1 Register */ 29#define OFFSET_RCR2 0x24 /* Receive Configuration 2 Register */ 30#define OFFSET_RCLKDIV 0x28 /* Receive Serial Clock Divider Register */ 31#define OFFSET_RFSDIV 0x2c /* Receive Frame Sync Divider Register */ 32#define OFFSET_STAT 0x30 /* Status Register */ 33 34#define SPORT_GET_TCR1(sport) bfin_read16(((sport)->port.membase + OFFSET_TCR1)) 35#define SPORT_GET_TCR2(sport) bfin_read16(((sport)->port.membase + OFFSET_TCR2)) 36#define SPORT_GET_TCLKDIV(sport) bfin_read16(((sport)->port.membase + OFFSET_TCLKDIV)) 37#define SPORT_GET_TFSDIV(sport) bfin_read16(((sport)->port.membase + OFFSET_TFSDIV)) 38#define SPORT_GET_TX(sport) bfin_read16(((sport)->port.membase + OFFSET_TX)) 39#define SPORT_GET_RX(sport) bfin_read16(((sport)->port.membase + OFFSET_RX)) 40/* 41 * If another interrupt fires while doing a 32-bit read from RX FIFO, 42 * a fake RX underflow error will be generated. So disable interrupts 43 * to prevent interruption while reading the FIFO. 44 */ 45#define SPORT_GET_RX32(sport) \ 46({ \ 47 unsigned int __ret; \ 48 unsigned long flags; \ 49 if (ANOMALY_05000473) \ 50 local_irq_save(flags); \ 51 __ret = bfin_read32((sport)->port.membase + OFFSET_RX); \ 52 if (ANOMALY_05000473) \ 53 local_irq_restore(flags); \ 54 __ret; \ 55}) 56#define SPORT_GET_RCR1(sport) bfin_read16(((sport)->port.membase + OFFSET_RCR1)) 57#define SPORT_GET_RCR2(sport) bfin_read16(((sport)->port.membase + OFFSET_RCR2)) 58#define SPORT_GET_RCLKDIV(sport) bfin_read16(((sport)->port.membase + OFFSET_RCLKDIV)) 59#define SPORT_GET_RFSDIV(sport) bfin_read16(((sport)->port.membase + OFFSET_RFSDIV)) 60#define SPORT_GET_STAT(sport) bfin_read16(((sport)->port.membase + OFFSET_STAT)) 61 62#define SPORT_PUT_TCR1(sport, v) bfin_write16(((sport)->port.membase + OFFSET_TCR1), v) 63#define SPORT_PUT_TCR2(sport, v) bfin_write16(((sport)->port.membase + OFFSET_TCR2), v) 64#define SPORT_PUT_TCLKDIV(sport, v) bfin_write16(((sport)->port.membase + OFFSET_TCLKDIV), v) 65#define SPORT_PUT_TFSDIV(sport, v) bfin_write16(((sport)->port.membase + OFFSET_TFSDIV), v) 66#define SPORT_PUT_TX(sport, v) bfin_write16(((sport)->port.membase + OFFSET_TX), v) 67#define SPORT_PUT_RX(sport, v) bfin_write16(((sport)->port.membase + OFFSET_RX), v) 68#define SPORT_PUT_RCR1(sport, v) bfin_write16(((sport)->port.membase + OFFSET_RCR1), v) 69#define SPORT_PUT_RCR2(sport, v) bfin_write16(((sport)->port.membase + OFFSET_RCR2), v) 70#define SPORT_PUT_RCLKDIV(sport, v) bfin_write16(((sport)->port.membase + OFFSET_RCLKDIV), v) 71#define SPORT_PUT_RFSDIV(sport, v) bfin_write16(((sport)->port.membase + OFFSET_RFSDIV), v) 72#define SPORT_PUT_STAT(sport, v) bfin_write16(((sport)->port.membase + OFFSET_STAT), v) 73 74#define SPORT_TX_FIFO_SIZE 8 75 76#define SPORT_UART_GET_CTS(x) gpio_get_value(x->cts_pin) 77#define SPORT_UART_DISABLE_RTS(x) gpio_set_value(x->rts_pin, 1) 78#define SPORT_UART_ENABLE_RTS(x) gpio_set_value(x->rts_pin, 0) 79 80#if defined(CONFIG_SERIAL_BFIN_SPORT0_UART_CTSRTS) \ 81 || defined(CONFIG_SERIAL_BFIN_SPORT1_UART_CTSRTS) \ 82 || defined(CONFIG_SERIAL_BFIN_SPORT2_UART_CTSRTS) \ 83 || defined(CONFIG_SERIAL_BFIN_SPORT3_UART_CTSRTS) 84# define CONFIG_SERIAL_BFIN_SPORT_CTSRTS 85#endif 86 87#endif /* _BFIN_SPORT_UART_H */ 88