mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 15:37:23 +00:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
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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.flags = DM_FLAG_PRE_RELOC,
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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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