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Diffstat (limited to 'arch/mips/include/asm/netlogic/xlp-hal/uart.h')
| -rw-r--r-- | arch/mips/include/asm/netlogic/xlp-hal/uart.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/uart.h b/arch/mips/include/asm/netlogic/xlp-hal/uart.h new file mode 100644 index 000000000000..6a7046ca094d --- /dev/null +++ b/arch/mips/include/asm/netlogic/xlp-hal/uart.h @@ -0,0 +1,191 @@ +/* + * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights + * reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the NetLogic + * license below: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __XLP_HAL_UART_H__ +#define __XLP_HAL_UART_H__ + +/* UART Specific registers */ +#define UART_RX_DATA 0x00 +#define UART_TX_DATA 0x00 + +#define UART_INT_EN 0x01 +#define UART_INT_ID 0x02 +#define UART_FIFO_CTL 0x02 +#define UART_LINE_CTL 0x03 +#define UART_MODEM_CTL 0x04 +#define UART_LINE_STS 0x05 +#define UART_MODEM_STS 0x06 + +#define UART_DIVISOR0 0x00 +#define UART_DIVISOR1 0x01 + +#define BASE_BAUD (XLP_IO_CLK/16) +#define BAUD_DIVISOR(baud) (BASE_BAUD / baud) + +/* LCR mask values */ +#define LCR_5BITS 0x00 +#define LCR_6BITS 0x01 +#define LCR_7BITS 0x02 +#define LCR_8BITS 0x03 +#define LCR_STOPB 0x04 +#define LCR_PENAB 0x08 +#define LCR_PODD 0x00 +#define LCR_PEVEN 0x10 +#define LCR_PONE 0x20 +#define LCR_PZERO 0x30 +#define LCR_SBREAK 0x40 +#define LCR_EFR_ENABLE 0xbf +#define LCR_DLAB 0x80 + +/* MCR mask values */ +#define MCR_DTR 0x01 +#define MCR_RTS 0x02 +#define MCR_DRS 0x04 +#define MCR_IE 0x08 +#define MCR_LOOPBACK 0x10 + +/* FCR mask values */ +#define FCR_RCV_RST 0x02 +#define FCR_XMT_RST 0x04 +#define FCR_RX_LOW 0x00 +#define FCR_RX_MEDL 0x40 +#define FCR_RX_MEDH 0x80 +#define FCR_RX_HIGH 0xc0 + +/* IER mask values */ +#define IER_ERXRDY 0x1 +#define IER_ETXRDY 0x2 +#define IER_ERLS 0x4 +#define IER_EMSC 0x8 + +#if !defined(LOCORE) && !defined(__ASSEMBLY__) + +#define nlm_read_uart_reg(b, r) nlm_read_reg(b, r) +#define nlm_write_uart_reg(b, r, v) nlm_write_reg(b, r, v) +#define nlm_get_uart_pcibase(node, inst) \ + nlm_pcicfg_base(XLP_IO_UART_OFFSET(node, inst)) +#define nlm_get_uart_regbase(node, inst) \ + (nlm_get_uart_pcibase(node, inst) + XLP_IO_PCI_HDRSZ) + +static inline void +nlm_uart_set_baudrate(uint64_t base, int baud) +{ + uint32_t lcr; + + lcr = nlm_read_uart_reg(base, UART_LINE_CTL); + + /* enable divisor register, and write baud values */ + nlm_write_uart_reg(base, UART_LINE_CTL, lcr | (1 << 7)); + nlm_write_uart_reg(base, UART_DIVISOR0, + (BAUD_DIVISOR(baud) & 0xff)); + nlm_write_uart_reg(base, UART_DIVISOR1, + ((BAUD_DIVISOR(baud) >> 8) & 0xff)); + + /* restore default lcr */ + nlm_write_uart_reg(base, UART_LINE_CTL, lcr); +} + +static inline void +nlm_uart_outbyte(uint64_t base, char c) +{ + uint32_t lsr; + + for (;;) { + lsr = nlm_read_uart_reg(base, UART_LINE_STS); + if (lsr & 0x20) + break; + } + + nlm_write_uart_reg(base, UART_TX_DATA, (int)c); +} + +static inline char +nlm_uart_inbyte(uint64_t base) +{ + int data, lsr; + + for (;;) { + lsr = nlm_read_uart_reg(base, UART_LINE_STS); + if (lsr & 0x80) { /* parity/frame/break-error - push a zero */ + data = 0; + break; + } + if (lsr & 0x01) { /* Rx data */ + data = nlm_read_uart_reg(base, UART_RX_DATA); + break; + } + } + + return (char)data; +} + +static inline int +nlm_uart_init(uint64_t base, int baud, int databits, int stopbits, + int parity, int int_en, int loopback) +{ + uint32_t lcr; + + lcr = 0; + if (databits >= 8) + lcr |= LCR_8BITS; + else if (databits == 7) + lcr |= LCR_7BITS; + else if (databits == 6) + lcr |= LCR_6BITS; + else + lcr |= LCR_5BITS; + + if (stopbits > 1) + lcr |= LCR_STOPB; + + lcr |= parity << 3; + + /* setup default lcr */ + nlm_write_uart_reg(base, UART_LINE_CTL, lcr); + + /* Reset the FIFOs */ + nlm_write_uart_reg(base, UART_LINE_CTL, FCR_RCV_RST | FCR_XMT_RST); + + nlm_uart_set_baudrate(base, baud); + + if (loopback) + nlm_write_uart_reg(base, UART_MODEM_CTL, 0x1f); + + if (int_en) + nlm_write_uart_reg(base, UART_INT_EN, IER_ERXRDY | IER_ETXRDY); + + return 0; +} +#endif /* !LOCORE && !__ASSEMBLY__ */ +#endif /* __XLP_HAL_UART_H__ */ |