https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 9735a22799b9214d17d3c231fe377fc852f042e9 authored by Linus Torvalds on 03 April 2016, 14:09:40 UTC
Linux 4.6-rc2
Linux 4.6-rc2
Tip revision: 9735a22
mpc52xx-psc.c
/*
* MPC5200 PSC serial console support.
*
* Author: Grant Likely <grant.likely@secretlab.ca>
*
* Copyright (c) 2007 Secret Lab Technologies Ltd.
* Copyright (c) 2007 Freescale Semiconductor, Inc.
*
* It is assumed that the firmware (or the platform file) has already set
* up the port.
*/
#include "types.h"
#include "io.h"
#include "ops.h"
/* Programmable Serial Controller (PSC) status register bits */
#define MPC52xx_PSC_SR 0x04
#define MPC52xx_PSC_SR_RXRDY 0x0100
#define MPC52xx_PSC_SR_RXFULL 0x0200
#define MPC52xx_PSC_SR_TXRDY 0x0400
#define MPC52xx_PSC_SR_TXEMP 0x0800
#define MPC52xx_PSC_BUFFER 0x0C
static void *psc;
static int psc_open(void)
{
/* Assume the firmware has already configured the PSC into
* uart mode */
return 0;
}
static void psc_putc(unsigned char c)
{
while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
out_8(psc + MPC52xx_PSC_BUFFER, c);
}
static unsigned char psc_tstc(void)
{
return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
}
static unsigned char psc_getc(void)
{
while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
return in_8(psc + MPC52xx_PSC_BUFFER);
}
int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
{
/* Get the base address of the psc registers */
if (dt_get_virtual_reg(devp, &psc, 1) < 1)
return -1;
scdp->open = psc_open;
scdp->putc = psc_putc;
scdp->getc = psc_getc;
scdp->tstc = psc_tstc;
return 0;
}