mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 13:16:16 +09:00
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>
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <serial.h>
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#include <asm/io.h>
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/* data register */
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#define ALTERA_JTAG_RVALID BIT(15) /* Read valid */
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/* control register */
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#define ALTERA_JTAG_AC BIT(10) /* activity indicator */
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#define ALTERA_JTAG_RRDY BIT(12) /* read available */
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#define ALTERA_JTAG_WSPACE(d) ((d) >> 16) /* Write space avail */
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/* Write fifo size. FIXME: this should be extracted with sopc2dts */
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#define ALTERA_JTAG_WRITE_DEPTH 64
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struct altera_jtaguart_regs {
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u32 data; /* Data register */
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u32 control; /* Control register */
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};
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struct altera_jtaguart_platdata {
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struct altera_jtaguart_regs *regs;
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};
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static int altera_jtaguart_setbrg(struct udevice *dev, int baudrate)
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{
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return 0;
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}
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static int altera_jtaguart_putc(struct udevice *dev, const char ch)
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{
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struct altera_jtaguart_platdata *plat = dev->platdata;
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struct altera_jtaguart_regs *const regs = plat->regs;
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u32 st = readl(®s->control);
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#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
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if (!(st & ALTERA_JTAG_AC)) /* no connection yet */
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return -ENETUNREACH;
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#endif
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if (ALTERA_JTAG_WSPACE(st) == 0)
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return -EAGAIN;
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writel(ch, ®s->data);
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return 0;
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}
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static int altera_jtaguart_pending(struct udevice *dev, bool input)
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{
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struct altera_jtaguart_platdata *plat = dev->platdata;
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struct altera_jtaguart_regs *const regs = plat->regs;
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u32 st = readl(®s->control);
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if (input)
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return st & ALTERA_JTAG_RRDY ? 1 : 0;
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else
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return !(ALTERA_JTAG_WSPACE(st) == ALTERA_JTAG_WRITE_DEPTH);
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}
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static int altera_jtaguart_getc(struct udevice *dev)
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{
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struct altera_jtaguart_platdata *plat = dev->platdata;
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struct altera_jtaguart_regs *const regs = plat->regs;
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u32 val;
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val = readl(®s->data);
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if (!(val & ALTERA_JTAG_RVALID))
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return -EAGAIN;
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return val & 0xff;
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}
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static int altera_jtaguart_probe(struct udevice *dev)
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{
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#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
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struct altera_jtaguart_platdata *plat = dev->platdata;
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struct altera_jtaguart_regs *const regs = plat->regs;
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writel(ALTERA_JTAG_AC, ®s->control); /* clear AC flag */
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#endif
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return 0;
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}
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static int altera_jtaguart_ofdata_to_platdata(struct udevice *dev)
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{
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struct altera_jtaguart_platdata *plat = dev_get_platdata(dev);
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plat->regs = map_physmem(devfdt_get_addr(dev),
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sizeof(struct altera_jtaguart_regs),
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MAP_NOCACHE);
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return 0;
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}
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static const struct dm_serial_ops altera_jtaguart_ops = {
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.putc = altera_jtaguart_putc,
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.pending = altera_jtaguart_pending,
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.getc = altera_jtaguart_getc,
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.setbrg = altera_jtaguart_setbrg,
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};
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static const struct udevice_id altera_jtaguart_ids[] = {
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{ .compatible = "altr,juart-1.0" },
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{}
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};
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U_BOOT_DRIVER(altera_jtaguart) = {
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.name = "altera_jtaguart",
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.id = UCLASS_SERIAL,
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.of_match = altera_jtaguart_ids,
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.ofdata_to_platdata = altera_jtaguart_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct altera_jtaguart_platdata),
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.probe = altera_jtaguart_probe,
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.ops = &altera_jtaguart_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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#ifdef CONFIG_DEBUG_UART_ALTERA_JTAGUART
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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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}
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static inline void _debug_uart_putc(int ch)
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{
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struct altera_jtaguart_regs *regs = (void *)CONFIG_DEBUG_UART_BASE;
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while (1) {
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u32 st = readl(®s->control);
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if (ALTERA_JTAG_WSPACE(st))
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break;
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}
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writel(ch, ®s->data);
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}
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DEBUG_UART_FUNCS
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#endif
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