--- /dev/null
+/*
+ * 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(cpu_is_xlp9xx() ? XLP9XX_IO_UART_OFFSET(node) : \
+ 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__ */
Code Review / kvmfornfv.git / blobdiff