diff options
Diffstat (limited to 'sys/contrib/octeon-sdk/cvmx-uart.c')
| -rw-r--r-- | sys/contrib/octeon-sdk/cvmx-uart.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/sys/contrib/octeon-sdk/cvmx-uart.c b/sys/contrib/octeon-sdk/cvmx-uart.c new file mode 100644 index 0000000..aead3e1 --- /dev/null +++ b/sys/contrib/octeon-sdk/cvmx-uart.c @@ -0,0 +1,171 @@ +/***********************license start*************** + * Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights + * reserved. + * + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * 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. + + * * Neither the name of Cavium Networks nor the names of + * its contributors may be used to endorse or promote products + * derived from this software without specific prior written + * permission. + + * This Software, including technical data, may be subject to U.S. export control + * laws, including the U.S. Export Administration Act and its associated + * regulations, and may be subject to export or import regulations in other + * countries. + + * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS" + * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR + * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO + * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR + * DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM + * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, + * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF + * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR + * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR + * PERFORMANCE OF THE SOFTWARE LIES WITH YOU. + ***********************license end**************************************/ + + +#ifdef CVMX_BUILD_FOR_LINUX_KERNEL +#include <linux/module.h> +#include <asm/octeon/cvmx.h> +#include <asm/octeon/cvmx-clock.h> +#include <asm/octeon/cvmx-uart.h> +#else +#include "executive-config.h" +#include "cvmx.h" +#include "cvmx-uart.h" +#include "cvmx-interrupt.h" +#endif + +#ifndef __OCTEON_NEWLIB__ +void cvmx_uart_enable_intr(int uart, cvmx_uart_intr_handler_t handler) +{ +#ifndef CVMX_BUILD_FOR_LINUX_KERNEL + cvmx_uart_ier_t ier; + + cvmx_interrupt_register(CVMX_IRQ_UART0 + uart, handler, NULL); + /* Enable uart interrupts for debugger Control-C processing */ + ier.u64 = cvmx_read_csr(CVMX_MIO_UARTX_IER(uart)); + ier.s.erbfi = 1; + cvmx_write_csr(CVMX_MIO_UARTX_IER(uart), ier.u64); + + cvmx_interrupt_unmask_irq(CVMX_IRQ_UART0 + uart); +#endif +} +#endif + +static int cvmx_uart_simulator_p(void) +{ +#ifndef __OCTEON_NEWLIB__ + return cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_SIM; +#else + extern int __octeon_simulator_p; + return __octeon_simulator_p; +#endif +} + + +/** + * Function that does the real work of setting up the Octeon uart. + * Takes all parameters as arguments, so it does not require gd + * structure to be set up. + * + * @param uart_index Index of uart to configure + * @param cpu_clock_hertz + * CPU clock frequency in Hz + * @param baudrate Baudrate to configure + * + * @return 0 on success + * !0 on error + */ +int cvmx_uart_setup2(int uart_index, int cpu_clock_hertz, int baudrate) +{ + uint16_t divisor; + cvmx_uart_fcr_t fcrval; + cvmx_uart_mcr_t mcrval; + cvmx_uart_lcr_t lcrval; + + fcrval.u64 = 0; + fcrval.s.en = 1; /* enable the FIFO's */ + fcrval.s.rxfr = 1; /* reset the RX fifo */ + fcrval.s.txfr = 1; /* reset the TX fifo */ + + if (cvmx_uart_simulator_p()) + divisor = 1; + else + divisor = ((unsigned long)(cpu_clock_hertz + 8 * baudrate) / (unsigned long)(16 * baudrate)); + + cvmx_write_csr(CVMX_MIO_UARTX_FCR(uart_index), fcrval.u64); + + mcrval.u64 = 0; + if (uart_index == 1 && cvmx_uart_simulator_p()) + mcrval.s.afce = 1; /* enable auto flow control for simulator. Needed for gdb regression callfuncs.exp. */ + else + mcrval.s.afce = 0; /* disable auto flow control so board can power on without serial port connected */ + + mcrval.s.rts = 1; /* looks like this must be set for auto flow control to work */ + + cvmx_read_csr(CVMX_MIO_UARTX_LSR(uart_index)); + + lcrval.u64 = 0; + lcrval.s.cls = CVMX_UART_BITS8; + lcrval.s.stop = 0; /* stop bit included? */ + lcrval.s.pen = 0; /* no parity? */ + lcrval.s.eps = 1; /* even parity? */ + lcrval.s.dlab = 1; /* temporary to program the divisor */ + cvmx_write_csr(CVMX_MIO_UARTX_LCR(uart_index), lcrval.u64); + + cvmx_write_csr(CVMX_MIO_UARTX_DLL(uart_index), divisor & 0xff); + cvmx_write_csr(CVMX_MIO_UARTX_DLH(uart_index), (divisor>>8) & 0xff); + + lcrval.s.dlab = 0; /* divisor is programmed now, set this back to normal */ + cvmx_write_csr(CVMX_MIO_UARTX_LCR(uart_index), lcrval.u64); + + /* spec says need to wait after you program the divisor */ + if (!cvmx_uart_simulator_p()) + { + uint64_t read_cycle; + CVMX_MF_CYCLE (read_cycle); + read_cycle += (2 * divisor * 16) + 10000; + + /* Spin */ + while (1) + { + uint64_t new_cycle; + CVMX_MF_CYCLE (new_cycle); + if (new_cycle >= read_cycle) + break; + } + } + + /* Don't enable flow control until after baud rate is configured. - we don't want + ** to allow characters in until after the baud rate is fully configured */ + cvmx_write_csr(CVMX_MIO_UARTX_MCR(uart_index), mcrval.u64); + return 0; + +} + +/** + * Setup a uart for use + * + * @param uart_index Uart to setup (0 or 1) + * @return Zero on success + */ +int cvmx_uart_setup (int uart_index) +{ + return cvmx_uart_setup2(uart_index, cvmx_clock_get_rate (CVMX_CLOCK_SCLK), 115200); +} + |
