From f0859573f90b539e2a37857b129323c3d6211512 Mon Sep 17 00:00:00 2001 From: Kinsey Moore Date: Mon, 26 Oct 2020 10:26:49 -0500 Subject: bsps: Move zynq-uart to bsps/shared This moves the zynq-uart driver from bsps/arm/shared to bsps/shared to accomodate use by AArch64 BSPs. --- bsps/arm/shared/serial/zynq-uart-polled.c | 184 ------------------------------ bsps/arm/shared/serial/zynq-uart.c | 177 ---------------------------- 2 files changed, 361 deletions(-) delete mode 100644 bsps/arm/shared/serial/zynq-uart-polled.c delete mode 100644 bsps/arm/shared/serial/zynq-uart.c (limited to 'bsps/arm/shared/serial') diff --git a/bsps/arm/shared/serial/zynq-uart-polled.c b/bsps/arm/shared/serial/zynq-uart-polled.c deleted file mode 100644 index e6f478ee07..0000000000 --- a/bsps/arm/shared/serial/zynq-uart-polled.c +++ /dev/null @@ -1,184 +0,0 @@ -/* - * SPDX-License-Identifier: BSD-2-Clause - * - * Copyright (C) 2013, 2017 embedded brains GmbH - * - * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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. - */ - -#include -#include - -#include - -/* - * Make weak and let the user override. - */ -uint32_t zynq_uart_input_clock(void) __attribute__ ((weak)); - -uint32_t zynq_uart_input_clock(void) -{ - return ZYNQ_CLOCK_UART; -} - -static int zynq_cal_baud_rate(uint32_t baudrate, - uint32_t* brgr, - uint32_t* bauddiv, - uint32_t modereg) -{ - uint32_t brgr_value; /* Calculated value for baud rate generator */ - uint32_t calcbaudrate; /* Calculated baud rate */ - uint32_t bauderror; /* Diff between calculated and requested baud rate */ - uint32_t best_error = 0xFFFFFFFF; - uint32_t percenterror; - uint32_t bdiv; - uint32_t inputclk = zynq_uart_input_clock(); - - /* - * Make sure the baud rate is not impossilby large. - * Fastest possible baud rate is Input Clock / 2. - */ - if ((baudrate * 2) > inputclk) { - return -1; - } - /* - * Check whether the input clock is divided by 8 - */ - if(modereg & ZYNQ_UART_MODE_CLKS) { - inputclk = inputclk / 8; - } - - /* - * Determine the Baud divider. It can be 4to 254. - * Loop through all possible combinations - */ - for (bdiv = 4; bdiv < 255; bdiv++) { - - /* - * Calculate the value for BRGR register - */ - brgr_value = inputclk / (baudrate * (bdiv + 1)); - - /* - * Calculate the baud rate from the BRGR value - */ - calcbaudrate = inputclk/ (brgr_value * (bdiv + 1)); - - /* - * Avoid unsigned integer underflow - */ - if (baudrate > calcbaudrate) { - bauderror = baudrate - calcbaudrate; - } - else { - bauderror = calcbaudrate - baudrate; - } - - /* - * Find the calculated baud rate closest to requested baud rate. - */ - if (best_error > bauderror) { - *brgr = brgr_value; - *bauddiv = bdiv; - best_error = bauderror; - } - } - - /* - * Make sure the best error is not too large. - */ - percenterror = (best_error * 100) / baudrate; -#define XUARTPS_MAX_BAUD_ERROR_RATE 3 /* max % error allowed */ - if (XUARTPS_MAX_BAUD_ERROR_RATE < percenterror) { - return -1; - } - - return 0; -} - -void zynq_uart_initialize(rtems_termios_device_context *base) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - uint32_t brgr = 0x3e; - uint32_t bauddiv = 0x6; - - zynq_uart_reset_tx_flush(ctx); - - zynq_cal_baud_rate(ZYNQ_UART_DEFAULT_BAUD, &brgr, &bauddiv, regs->mode); - - regs->control &= ~(ZYNQ_UART_CONTROL_RXEN | ZYNQ_UART_CONTROL_TXEN); - regs->control = ZYNQ_UART_CONTROL_RXDIS - | ZYNQ_UART_CONTROL_TXDIS - | ZYNQ_UART_CONTROL_RXRES - | ZYNQ_UART_CONTROL_TXRES; - regs->mode = ZYNQ_UART_MODE_CHMODE(ZYNQ_UART_MODE_CHMODE_NORMAL) - | ZYNQ_UART_MODE_PAR(ZYNQ_UART_MODE_PAR_NONE) - | ZYNQ_UART_MODE_CHRL(ZYNQ_UART_MODE_CHRL_8); - regs->baud_rate_gen = ZYNQ_UART_BAUD_RATE_GEN_CD(brgr); - regs->baud_rate_div = ZYNQ_UART_BAUD_RATE_DIV_BDIV(bauddiv); - regs->rx_fifo_trg_lvl = ZYNQ_UART_RX_FIFO_TRG_LVL_RTRIG(0); - regs->rx_timeout = ZYNQ_UART_RX_TIMEOUT_RTO(0); - regs->control = ZYNQ_UART_CONTROL_RXEN - | ZYNQ_UART_CONTROL_TXEN - | ZYNQ_UART_CONTROL_RSTTO; -} - -int zynq_uart_read_polled(rtems_termios_device_context *base) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - - if ((regs->channel_sts & ZYNQ_UART_CHANNEL_STS_REMPTY) != 0) { - return -1; - } else { - return ZYNQ_UART_TX_RX_FIFO_FIFO_GET(regs->tx_rx_fifo); - } -} - -void zynq_uart_write_polled( - rtems_termios_device_context *base, - char c -) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - - while ((regs->channel_sts & ZYNQ_UART_CHANNEL_STS_TFUL) != 0) { - /* Wait */ - } - - regs->tx_rx_fifo = ZYNQ_UART_TX_RX_FIFO_FIFO(c); -} - -void zynq_uart_reset_tx_flush(zynq_uart_context *ctx) -{ - volatile zynq_uart *regs = ctx->regs; - int c = 4; - - while (c-- > 0) - zynq_uart_write_polled(&ctx->base, '\r'); - - while ((regs->channel_sts & ZYNQ_UART_CHANNEL_STS_TEMPTY) == 0) { - /* Wait */ - } -} diff --git a/bsps/arm/shared/serial/zynq-uart.c b/bsps/arm/shared/serial/zynq-uart.c deleted file mode 100644 index fc670441b8..0000000000 --- a/bsps/arm/shared/serial/zynq-uart.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * SPDX-License-Identifier: BSD-2-Clause - * - * Copyright (C) 2013, 2017 embedded brains GmbH - * - * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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. - */ - -#include -#include -#include - -#include - -#ifdef ZYNQ_CONSOLE_USE_INTERRUPTS -static void zynq_uart_interrupt(void *arg) -{ - rtems_termios_tty *tty = arg; - zynq_uart_context *ctx = rtems_termios_get_device_context(tty); - volatile zynq_uart *regs = ctx->regs; - uint32_t channel_sts; - - if ((regs->irq_sts & (ZYNQ_UART_TIMEOUT | ZYNQ_UART_RTRIG)) != 0) { - regs->irq_sts = ZYNQ_UART_TIMEOUT | ZYNQ_UART_RTRIG; - - do { - char c = (char) ZYNQ_UART_TX_RX_FIFO_FIFO_GET(regs->tx_rx_fifo); - - rtems_termios_enqueue_raw_characters(tty, &c, 1); - - channel_sts = regs->channel_sts; - } while ((channel_sts & ZYNQ_UART_CHANNEL_STS_REMPTY) == 0); - } else { - channel_sts = regs->channel_sts; - } - - if (ctx->transmitting && (channel_sts & ZYNQ_UART_CHANNEL_STS_TEMPTY) != 0) { - rtems_termios_dequeue_characters(tty, 1); - } -} -#endif - -static bool zynq_uart_first_open( - rtems_termios_tty *tty, - rtems_termios_device_context *base, - struct termios *term, - rtems_libio_open_close_args_t *args -) -{ -#ifdef ZYNQ_CONSOLE_USE_INTERRUPTS - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - rtems_status_code sc; -#endif - - rtems_termios_set_initial_baud(tty, ZYNQ_UART_DEFAULT_BAUD); - zynq_uart_initialize(base); - -#ifdef ZYNQ_CONSOLE_USE_INTERRUPTS - regs->rx_timeout = 32; - regs->rx_fifo_trg_lvl = ZYNQ_UART_FIFO_DEPTH / 2; - regs->irq_dis = 0xffffffff; - regs->irq_sts = 0xffffffff; - regs->irq_en = ZYNQ_UART_RTRIG | ZYNQ_UART_TIMEOUT; - sc = rtems_interrupt_handler_install( - ctx->irq, - "UART", - RTEMS_INTERRUPT_SHARED, - zynq_uart_interrupt, - tty - ); - if (sc != RTEMS_SUCCESSFUL) { - return false; - } -#endif - - return true; -} - -#ifdef ZYNQ_CONSOLE_USE_INTERRUPTS -static void zynq_uart_last_close( - rtems_termios_tty *tty, - rtems_termios_device_context *base, - rtems_libio_open_close_args_t *args -) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - - rtems_interrupt_handler_remove(ctx->irq, zynq_uart_interrupt, tty); -} -#endif - -static void zynq_uart_write_support( - rtems_termios_device_context *base, - const char *buf, - size_t len -) -{ -#ifdef ZYNQ_CONSOLE_USE_INTERRUPTS - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - - if (len > 0) { - ctx->transmitting = true; - regs->irq_sts = ZYNQ_UART_TEMPTY; - regs->irq_en = ZYNQ_UART_TEMPTY; - regs->tx_rx_fifo = ZYNQ_UART_TX_RX_FIFO_FIFO(buf[0]); - } else { - ctx->transmitting = false; - regs->irq_dis = ZYNQ_UART_TEMPTY; - } -#else - ssize_t i; - - for (i = 0; i < len; ++i) { - zynq_uart_write_polled(base, buf[i]); - } -#endif -} - -static bool zynq_uart_set_attributes( - rtems_termios_device_context *context, - const struct termios *term -) -{ -#if 0 - volatile zynq_uart *regs = zynq_uart_get_regs(minor); - uint32_t brgr = 0; - uint32_t bauddiv = 0; - int rc; - - rc = zynq_cal_baud_rate(115200, &brgr, &bauddiv, regs->mode); - if (rc != 0) - return rc; - - regs->control &= ~(ZYNQ_UART_CONTROL_RXEN | ZYNQ_UART_CONTROL_TXEN); - regs->baud_rate_gen = ZYNQ_UART_BAUD_RATE_GEN_CD(brgr); - regs->baud_rate_div = ZYNQ_UART_BAUD_RATE_DIV_BDIV(bauddiv); - regs->control |= ZYNQ_UART_CONTROL_RXEN | ZYNQ_UART_CONTROL_TXEN; - - return true; -#else - return false; -#endif -} - -const rtems_termios_device_handler zynq_uart_handler = { - .first_open = zynq_uart_first_open, - .set_attributes = zynq_uart_set_attributes, - .write = zynq_uart_write_support, -#ifdef ZYNQ_CONSOLE_USE_INTERRUPTS - .last_close = zynq_uart_last_close, - .mode = TERMIOS_IRQ_DRIVEN -#else - .poll_read = zynq_uart_read_polled, - .mode = TERMIOS_POLLED -#endif -}; -- cgit v1.2.3