109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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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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* (C) Copyright 2011 - Franck JULLIEN <elec4fun@gmail.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <malloc.h>
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#include <io.h>
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#include <asm/nios2-io.h>
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struct altera_serial_jtag_priv {
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struct console_device cdev;
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void __iomem *regs;
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};
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static int altera_serial_jtag_setbaudrate(struct console_device *cdev, int baudrate)
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{
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return 0;
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}
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static void altera_serial_jtag_putc(struct console_device *cdev, char c)
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{
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struct altera_serial_jtag_priv *priv = container_of(cdev,
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struct altera_serial_jtag_priv, cdev);
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struct nios_jtag *jtag = priv->regs;
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uint32_t st;
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while (1) {
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st = readl(&jtag->control);
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if (NIOS_JTAG_WSPACE(st))
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break;
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}
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writel(c, &jtag->data);
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}
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static int altera_serial_jtag_tstc(struct console_device *cdev)
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{
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struct altera_serial_jtag_priv *priv = container_of(cdev,
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struct altera_serial_jtag_priv, cdev);
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struct nios_jtag *jtag = priv->regs;
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return readl(&jtag->control) & NIOS_JTAG_RRDY;
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}
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static int altera_serial_jtag_getc(struct console_device *cdev)
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{
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struct altera_serial_jtag_priv *priv = container_of(cdev,
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struct altera_serial_jtag_priv, cdev);
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struct nios_jtag *jtag = priv->regs;
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uint32_t val;
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while (1) {
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val = readl(&jtag->data);
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if (val & NIOS_JTAG_RVALID)
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break;
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}
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return val & 0xFF;
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}
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static int altera_serial_jtag_probe(struct device_d *dev) {
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struct console_device *cdev;
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struct altera_serial_jtag_priv *priv;
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priv = xzalloc(sizeof(*priv));
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cdev = &priv->cdev;
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priv->regs = dev_request_mem_region(dev, 0);
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cdev->dev = dev;
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cdev->tstc = altera_serial_jtag_tstc;
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cdev->putc = altera_serial_jtag_putc;
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cdev->getc = altera_serial_jtag_getc;
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cdev->setbrg = altera_serial_jtag_setbaudrate;
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console_register(cdev);
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return 0;
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}
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static struct driver_d altera_serial_jtag_driver = {
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.name = "altera_serial_jtag",
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.probe = altera_serial_jtag_probe,
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};
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console_platform_driver(altera_serial_jtag_driver);
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