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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
150 lines
3.2 KiB
C
150 lines
3.2 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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#include <linux/bitops.h>
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/* status register */
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#define ALTERA_UART_TMT BIT(5) /* tx empty */
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#define ALTERA_UART_TRDY BIT(6) /* tx ready */
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#define ALTERA_UART_RRDY BIT(7) /* rx ready */
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struct altera_uart_regs {
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u32 rxdata; /* Rx data reg */
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u32 txdata; /* Tx data reg */
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u32 status; /* Status reg */
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u32 control; /* Control reg */
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u32 divisor; /* Baud rate divisor reg */
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u32 endofpacket; /* End-of-packet reg */
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};
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struct altera_uart_platdata {
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struct altera_uart_regs *regs;
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unsigned int uartclk;
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};
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static int altera_uart_setbrg(struct udevice *dev, int baudrate)
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{
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struct altera_uart_platdata *plat = dev->platdata;
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struct altera_uart_regs *const regs = plat->regs;
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u32 div;
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div = (plat->uartclk / baudrate) - 1;
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writel(div, ®s->divisor);
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return 0;
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}
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static int altera_uart_putc(struct udevice *dev, const char ch)
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{
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struct altera_uart_platdata *plat = dev->platdata;
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struct altera_uart_regs *const regs = plat->regs;
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if (!(readl(®s->status) & ALTERA_UART_TRDY))
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return -EAGAIN;
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writel(ch, ®s->txdata);
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return 0;
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}
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static int altera_uart_pending(struct udevice *dev, bool input)
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{
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struct altera_uart_platdata *plat = dev->platdata;
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struct altera_uart_regs *const regs = plat->regs;
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u32 st = readl(®s->status);
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if (input)
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return st & ALTERA_UART_RRDY ? 1 : 0;
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else
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return !(st & ALTERA_UART_TMT);
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}
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static int altera_uart_getc(struct udevice *dev)
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{
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struct altera_uart_platdata *plat = dev->platdata;
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struct altera_uart_regs *const regs = plat->regs;
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if (!(readl(®s->status) & ALTERA_UART_RRDY))
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return -EAGAIN;
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return readl(®s->rxdata) & 0xff;
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}
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static int altera_uart_probe(struct udevice *dev)
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{
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return 0;
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}
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static int altera_uart_ofdata_to_platdata(struct udevice *dev)
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{
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struct altera_uart_platdata *plat = dev_get_platdata(dev);
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plat->regs = map_physmem(dev_read_addr(dev),
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sizeof(struct altera_uart_regs),
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MAP_NOCACHE);
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plat->uartclk = dev_read_u32_default(dev, "clock-frequency", 0);
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return 0;
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}
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static const struct dm_serial_ops altera_uart_ops = {
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.putc = altera_uart_putc,
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.pending = altera_uart_pending,
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.getc = altera_uart_getc,
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.setbrg = altera_uart_setbrg,
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};
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static const struct udevice_id altera_uart_ids[] = {
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{ .compatible = "altr,uart-1.0" },
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{}
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};
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U_BOOT_DRIVER(altera_uart) = {
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.name = "altera_uart",
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.id = UCLASS_SERIAL,
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.of_match = altera_uart_ids,
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.ofdata_to_platdata = altera_uart_ofdata_to_platdata,
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.platdata_auto = sizeof(struct altera_uart_platdata),
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.probe = altera_uart_probe,
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.ops = &altera_uart_ops,
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};
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#ifdef CONFIG_DEBUG_UART_ALTERA_UART
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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 altera_uart_regs *regs = (void *)CONFIG_DEBUG_UART_BASE;
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u32 div;
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div = (CONFIG_DEBUG_UART_CLOCK / CONFIG_BAUDRATE) - 1;
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writel(div, ®s->divisor);
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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_uart_regs *regs = (void *)CONFIG_DEBUG_UART_BASE;
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while (1) {
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u32 st = readl(®s->status);
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if (st & ALTERA_UART_TRDY)
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break;
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}
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writel(ch, ®s->txdata);
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}
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DEBUG_UART_FUNCS
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#endif
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