169 lines
4.0 KiB
C
169 lines
4.0 KiB
C
/*
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* (C) Copyright 2000 - 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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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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* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
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* changes based on the file arch/ppc/mbxboot/m8260_tty.c from the
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* Linux/PPC sources (m8260_tty.c had no copyright info in it).
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*
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* Martin Krause, 8 Jun 2006
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* Added CONFIG_SERIAL_MULTI support
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*/
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/*
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* Minimal serial functions needed to use one of the PSC ports
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* as serial console interface.
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*/
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#include <common.h>
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#include <mach/mpc5xxx.h>
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#include <driver.h>
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#include <init.h>
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#include <console.h>
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#include <xfuncs.h>
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#include <mach/clocks.h>
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static int __mpc5xxx_serial_setbaudrate(struct mpc5xxx_psc *psc, int baudrate)
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{
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unsigned long baseclk;
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int div;
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#if defined(CONFIG_MGT5100)
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baseclk = (CFG_MPC5XXX_CLKIN + 16) / 32;
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#elif defined(CONFIG_MPC5200)
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baseclk = (get_ipb_clock() + 16) / 32;
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#endif
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/* set up UART divisor */
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div = (baseclk + (baudrate/2)) / baudrate;
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psc->ctur = (div >> 8) & 0xFF;
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psc->ctlr = div & 0xff;
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return 0;
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}
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static int mpc5xxx_serial_setbaudrate(struct console_device *cdev, int baudrate)
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{
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struct device_d *dev = cdev->dev;
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struct mpc5xxx_psc *psc = dev->priv;
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__mpc5xxx_serial_setbaudrate(psc, baudrate);
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return 0;
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}
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static int __mpc5xxx_serial_init(struct mpc5xxx_psc *psc)
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{
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/* reset PSC */
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psc->command = PSC_SEL_MODE_REG_1;
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/* select clock sources */
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#if defined(CONFIG_MGT5100)
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psc->psc_clock_select = 0xdd00;
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#elif defined(CONFIG_MPC5200)
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psc->psc_clock_select = 0;
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#endif
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/* switch to UART mode */
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psc->sicr = 0;
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/* configure parity, bit length and so on */
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#if defined(CONFIG_MGT5100)
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psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
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#elif defined(CONFIG_MPC5200)
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psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
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#endif
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psc->mode = PSC_MODE_ONE_STOP;
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/* disable all interrupts */
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psc->psc_imr = 0;
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/* reset and enable Rx/Tx */
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// psc->command = PSC_RST_RX;
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// psc->command = PSC_RST_TX;
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psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
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return 0;
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}
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static int mpc5xxx_serial_init(struct console_device *cdev)
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{
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struct device_d *dev = cdev->dev;
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struct mpc5xxx_psc *psc = dev->priv;
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__mpc5xxx_serial_init(psc);
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return 0;
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}
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static void mpc5xxx_serial_putc (struct console_device *cdev, const char c)
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{
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struct device_d *dev = cdev->dev;
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struct mpc5xxx_psc *psc = dev->priv;
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/* Wait for last character to go. */
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while (!(psc->psc_status & PSC_SR_TXEMP))
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;
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psc->psc_buffer_8 = c;
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}
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static int mpc5xxx_serial_getc (struct console_device *cdev)
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{
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struct device_d *dev = cdev->dev;
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struct mpc5xxx_psc *psc = dev->priv;
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/* Wait for a character to arrive. */
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while (!(psc->psc_status & PSC_SR_RXRDY))
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;
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return psc->psc_buffer_8;
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}
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static int mpc5xxx_serial_tstc (struct console_device *cdev)
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{
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struct device_d *dev = cdev->dev;
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struct mpc5xxx_psc *psc = dev->priv;
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return (psc->psc_status & PSC_SR_RXRDY);
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}
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static int mpc5xxx_serial_probe(struct device_d *dev)
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{
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struct console_device *cdev;
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cdev = xzalloc(sizeof(struct console_device));
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dev->priv = dev_request_mem_region(dev, 0);
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cdev->dev = dev;
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cdev->tstc = mpc5xxx_serial_tstc;
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cdev->putc = mpc5xxx_serial_putc;
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cdev->getc = mpc5xxx_serial_getc;
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cdev->setbrg = mpc5xxx_serial_setbaudrate;
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mpc5xxx_serial_init(cdev);
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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 mpc5xxx_serial_driver = {
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.name = "mpc5xxx_serial",
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.probe = mpc5xxx_serial_probe,
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};
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console_platform_driver(mpc5xxx_serial_driver);
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