139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu>
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* Clean driver and add xilinx constant from header file
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*
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* (C) Copyright 2004 Atmark Techno, Inc.
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* Yasushi SHOJI <yashi@atmark-techno.com>
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*/
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#include <config.h>
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#include <common.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <linux/compiler.h>
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#include <serial.h>
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#define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */
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#define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */
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#define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */
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#define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */
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#define ULITE_CONTROL_RST_TX 0x01
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#define ULITE_CONTROL_RST_RX 0x02
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struct uartlite {
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unsigned int rx_fifo;
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unsigned int tx_fifo;
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unsigned int status;
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unsigned int control;
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};
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struct uartlite_platdata {
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struct uartlite *regs;
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};
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static int uartlite_serial_putc(struct udevice *dev, const char ch)
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{
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struct uartlite_platdata *plat = dev_get_platdata(dev);
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struct uartlite *regs = plat->regs;
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if (in_be32(®s->status) & SR_TX_FIFO_FULL)
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return -EAGAIN;
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out_be32(®s->tx_fifo, ch & 0xff);
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return 0;
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}
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static int uartlite_serial_getc(struct udevice *dev)
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{
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struct uartlite_platdata *plat = dev_get_platdata(dev);
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struct uartlite *regs = plat->regs;
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if (!(in_be32(®s->status) & SR_RX_FIFO_VALID_DATA))
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return -EAGAIN;
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return in_be32(®s->rx_fifo) & 0xff;
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}
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static int uartlite_serial_pending(struct udevice *dev, bool input)
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{
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struct uartlite_platdata *plat = dev_get_platdata(dev);
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struct uartlite *regs = plat->regs;
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if (input)
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return in_be32(®s->status) & SR_RX_FIFO_VALID_DATA;
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return !(in_be32(®s->status) & SR_TX_FIFO_EMPTY);
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}
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static int uartlite_serial_probe(struct udevice *dev)
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{
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struct uartlite_platdata *plat = dev_get_platdata(dev);
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struct uartlite *regs = plat->regs;
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out_be32(®s->control, 0);
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out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
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in_be32(®s->control);
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return 0;
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}
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static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct uartlite_platdata *plat = dev_get_platdata(dev);
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plat->regs = (struct uartlite *)devfdt_get_addr(dev);
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return 0;
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}
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static const struct dm_serial_ops uartlite_serial_ops = {
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.putc = uartlite_serial_putc,
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.pending = uartlite_serial_pending,
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.getc = uartlite_serial_getc,
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};
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static const struct udevice_id uartlite_serial_ids[] = {
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{ .compatible = "xlnx,opb-uartlite-1.00.b", },
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{ .compatible = "xlnx,xps-uartlite-1.00.a" },
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{ }
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};
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U_BOOT_DRIVER(serial_uartlite) = {
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.name = "serial_uartlite",
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.id = UCLASS_SERIAL,
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.of_match = uartlite_serial_ids,
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.ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct uartlite_platdata),
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.probe = uartlite_serial_probe,
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.ops = &uartlite_serial_ops,
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};
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#ifdef CONFIG_DEBUG_UART_UARTLITE
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#include <debug_uart.h>
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static inline void _debug_uart_init(void)
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{
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struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
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out_be32(®s->control, 0);
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out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
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in_be32(®s->control);
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}
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static inline void _debug_uart_putc(int ch)
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{
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struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
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while (in_be32(®s->status) & SR_TX_FIFO_FULL)
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;
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out_be32(®s->tx_fifo, ch & 0xff);
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}
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DEBUG_UART_FUNCS
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#endif
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