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https://github.com/edk2-porting/linux-next.git
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da0a5f0c65
This patch adds a new generic device tree processing function that retrieves virtual reg addresses from the device tree to the bootwrapper code. It also updates the bootwrapper code to use the new function. dt_get_virtual_reg() retrieves the virtual reg addresses from the "virtual-reg" property. If the property can't be found, it uses the "reg" property and walks the tree to translate it to absolute addresses. Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com> Acked-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* MPC5200 PSC serial console support.
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*
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* Author: Grant Likely <grant.likely@secretlab.ca>
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*
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* Copyright (c) 2007 Secret Lab Technologies Ltd.
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* It is assumed that the firmware (or the platform file) has already set
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* up the port.
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*/
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#include "types.h"
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#include "io.h"
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#include "ops.h"
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/* Programmable Serial Controller (PSC) status register bits */
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#define MPC52xx_PSC_SR 0x04
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#define MPC52xx_PSC_SR_RXRDY 0x0100
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#define MPC52xx_PSC_SR_RXFULL 0x0200
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#define MPC52xx_PSC_SR_TXRDY 0x0400
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#define MPC52xx_PSC_SR_TXEMP 0x0800
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#define MPC52xx_PSC_BUFFER 0x0C
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static void *psc;
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static int psc_open(void)
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{
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/* Assume the firmware has already configured the PSC into
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* uart mode */
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return 0;
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}
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static void psc_putc(unsigned char c)
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{
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while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
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out_8(psc + MPC52xx_PSC_BUFFER, c);
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}
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static unsigned char psc_tstc(void)
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{
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return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
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}
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static unsigned char psc_getc(void)
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{
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while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
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return in_8(psc + MPC52xx_PSC_BUFFER);
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}
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int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
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{
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/* Get the base address of the psc registers */
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if (dt_get_virtual_reg(devp, &psc, 1) < 1)
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return -1;
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scdp->open = psc_open;
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scdp->putc = psc_putc;
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scdp->getc = psc_getc;
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scdp->tstc = psc_tstc;
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return 0;
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}
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