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author | r.tyminski <r.tyminski@partner.samsung.com> | 2017-05-29 11:42:10 +0200 |
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committer | r.tyminski <r.tyminski@partner.samsung.com> | 2017-05-29 11:49:50 +0200 |
commit | f9a43781767007462965b21f3f518c4cfc0744c7 (patch) | |
tree | 201509439b1d9798256227794dae6774345adf43 /core/drivers/cdns_uart.c | |
parent | 1fed20f5471aa0dad5e4b4f79d1f2843ac88734f (diff) | |
download | tef-optee_os-f9a43781767007462965b21f3f518c4cfc0744c7.tar.gz tef-optee_os-f9a43781767007462965b21f3f518c4cfc0744c7.tar.bz2 tef-optee_os-f9a43781767007462965b21f3f518c4cfc0744c7.zip |
Initial commit with upstream sources
Change-Id: Ie9460111f21fc955102fd8732a0173b2d0499a4a
Diffstat (limited to 'core/drivers/cdns_uart.c')
-rw-r--r-- | core/drivers/cdns_uart.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/core/drivers/cdns_uart.c b/core/drivers/cdns_uart.c new file mode 100644 index 0000000..3b4e4b9 --- /dev/null +++ b/core/drivers/cdns_uart.c @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2016, Xilinx Inc. + * All rights reserved. + * + * 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 HOLDER 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 <compiler.h> +#include <drivers/cdns_uart.h> +#include <io.h> +#include <util.h> + +#define CDNS_UART_CONTROL 0 +#define CDNS_UART_MODE 4 +#define CDNS_UART_IEN 8 +#define CDNS_UART_IRQ_STATUS 0x14 +#define CDNS_UART_CHANNEL_STATUS 0x2c +#define CDNS_UART_FIFO 0x30 + +#define CDNS_UART_CONTROL_RXRES BIT(0) +#define CDNS_UART_CONTROL_TXRES BIT(1) +#define CDNS_UART_CONTROL_RXEN BIT(2) +#define CDNS_UART_CONTROL_TXEN BIT(4) + +#define CDNS_UART_MODE_8BIT (0 << 1) +#define CDNS_UART_MODE_PARITY_NONE (0x4 << 3) +#define CDNS_UART_MODE_1STP (0 << 6) + +#define CDNS_UART_CHANNEL_STATUS_TFUL BIT(4) +#define CDNS_UART_CHANNEL_STATUS_TEMPTY BIT(3) +#define CDNS_UART_CHANNEL_STATUS_REMPTY BIT(1) + +#define CDNS_UART_IRQ_RXTRIG BIT(0) +#define CDNS_UART_IRQ_RXTOUT BIT(8) + +void cdns_uart_flush(vaddr_t base) +{ + while (!(read32(base + CDNS_UART_CHANNEL_STATUS) & + CDNS_UART_CHANNEL_STATUS_TEMPTY)) + ; +} + +/* + * we rely on the bootloader having set up the HW correctly, we just enable + * transmitter/receiver here, just in case. + */ +void cdns_uart_init(vaddr_t base, uint32_t uart_clk, uint32_t baud_rate) +{ + if (!base || !uart_clk || !baud_rate) + return; + + /* Enable UART and RX/TX */ + write32(CDNS_UART_CONTROL_RXEN | CDNS_UART_CONTROL_TXEN, + base + CDNS_UART_CONTROL); + + cdns_uart_flush(base); +} + +void cdns_uart_putc(int ch, vaddr_t base) +{ + /* Wait until there is space in the FIFO */ + while (read32(base + CDNS_UART_CHANNEL_STATUS) & + CDNS_UART_CHANNEL_STATUS_TFUL) + ; + + /* Send the character */ + write32(ch, base + CDNS_UART_FIFO); +} + +bool cdns_uart_have_rx_data(vaddr_t base) +{ + return !(read32(base + CDNS_UART_CHANNEL_STATUS) & + CDNS_UART_CHANNEL_STATUS_REMPTY); +} + +int cdns_uart_getchar(vaddr_t base) +{ + while (!cdns_uart_have_rx_data(base)) + ; + return read32(base + CDNS_UART_FIFO) & 0xff; +} |