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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
/*
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* Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <serial.h>
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#include <asm/global_data.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct arc_serial_regs {
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unsigned int id0;
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unsigned int id1;
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unsigned int id2;
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unsigned int id3;
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unsigned int data;
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unsigned int status;
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unsigned int baudl;
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unsigned int baudh;
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};
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struct arc_serial_plat {
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struct arc_serial_regs *reg;
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unsigned int uartclk;
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};
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/* Bit definitions of STATUS register */
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#define UART_RXEMPTY (1 << 5)
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#define UART_OVERFLOW_ERR (1 << 1)
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#define UART_TXEMPTY (1 << 7)
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static int arc_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct arc_serial_plat *plat = dev_get_plat(dev);
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struct arc_serial_regs *const regs = plat->reg;
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int arc_console_baud = gd->cpu_clk / (baudrate * 4) - 1;
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writeb(arc_console_baud & 0xff, ®s->baudl);
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writeb((arc_console_baud & 0xff00) >> 8, ®s->baudh);
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return 0;
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}
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static int arc_serial_putc(struct udevice *dev, const char c)
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{
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struct arc_serial_plat *plat = dev_get_plat(dev);
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struct arc_serial_regs *const regs = plat->reg;
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if (!(readb(®s->status) & UART_TXEMPTY))
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return -EAGAIN;
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writeb(c, ®s->data);
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return 0;
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}
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static int arc_serial_tstc(struct arc_serial_regs *const regs)
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{
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return !(readb(®s->status) & UART_RXEMPTY);
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}
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static int arc_serial_pending(struct udevice *dev, bool input)
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{
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struct arc_serial_plat *plat = dev_get_plat(dev);
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struct arc_serial_regs *const regs = plat->reg;
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uint32_t status = readb(®s->status);
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if (input)
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return status & UART_RXEMPTY ? 0 : 1;
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else
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return status & UART_TXEMPTY ? 0 : 1;
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}
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static int arc_serial_getc(struct udevice *dev)
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{
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struct arc_serial_plat *plat = dev_get_plat(dev);
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struct arc_serial_regs *const regs = plat->reg;
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if (!arc_serial_tstc(regs))
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return -EAGAIN;
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/* Check for overflow errors */
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if (readb(®s->status) & UART_OVERFLOW_ERR)
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return 0;
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return readb(®s->data) & 0xFF;
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}
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static int arc_serial_probe(struct udevice *dev)
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{
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return 0;
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}
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static const struct dm_serial_ops arc_serial_ops = {
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.putc = arc_serial_putc,
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.pending = arc_serial_pending,
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.getc = arc_serial_getc,
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.setbrg = arc_serial_setbrg,
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};
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static const struct udevice_id arc_serial_ids[] = {
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{ .compatible = "snps,arc-uart" },
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{ }
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};
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static int arc_serial_of_to_plat(struct udevice *dev)
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{
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struct arc_serial_plat *plat = dev_get_plat(dev);
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DECLARE_GLOBAL_DATA_PTR;
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plat->reg = dev_read_addr_ptr(dev);
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plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
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"clock-frequency", 0);
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return 0;
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}
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U_BOOT_DRIVER(serial_arc) = {
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.name = "serial_arc",
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.id = UCLASS_SERIAL,
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.of_match = arc_serial_ids,
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.of_to_plat = arc_serial_of_to_plat,
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.plat_auto = sizeof(struct arc_serial_plat),
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.probe = arc_serial_probe,
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.ops = &arc_serial_ops,
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};
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#ifdef CONFIG_DEBUG_ARC_SERIAL
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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 arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_VAL(DEBUG_UART_BASE);
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int arc_console_baud = CONFIG_DEBUG_UART_CLOCK / (CONFIG_BAUDRATE * 4) - 1;
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writeb(arc_console_baud & 0xff, ®s->baudl);
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writeb((arc_console_baud & 0xff00) >> 8, ®s->baudh);
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}
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static inline void _debug_uart_putc(int c)
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{
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struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_VAL(DEBUG_UART_BASE);
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while (!(readb(®s->status) & UART_TXEMPTY))
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;
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writeb(c, ®s->data);
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}
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DEBUG_UART_FUNCS
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#endif
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