326 lines
6.7 KiB
C
326 lines
6.7 KiB
C
/*
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* SuperH SCIF device driver.
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* Copyright (C) 2013 Renesas Electronics Corporation
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* Copyright (C) 2007,2008,2010, 2014 Nobuhiro Iwamatsu
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* Copyright (C) 2002 - 2008 Paul Mundt
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <errno.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <serial.h>
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#include <linux/compiler.h>
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#include <dm/platform_data/serial_sh.h>
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#include "serial_sh.h"
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#if defined(CONFIG_CPU_SH7760) || \
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defined(CONFIG_CPU_SH7780) || \
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defined(CONFIG_CPU_SH7785) || \
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defined(CONFIG_CPU_SH7786)
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static int scif_rxfill(struct uart_port *port)
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{
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return sci_in(port, SCRFDR) & 0xff;
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}
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#elif defined(CONFIG_CPU_SH7763)
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static int scif_rxfill(struct uart_port *port)
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{
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if ((port->mapbase == 0xffe00000) ||
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(port->mapbase == 0xffe08000)) {
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/* SCIF0/1*/
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return sci_in(port, SCRFDR) & 0xff;
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} else {
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/* SCIF2 */
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return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
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}
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}
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#elif defined(CONFIG_ARCH_SH7372)
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static int scif_rxfill(struct uart_port *port)
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{
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if (port->type == PORT_SCIFA)
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return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
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else
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return sci_in(port, SCRFDR);
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}
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#else
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static int scif_rxfill(struct uart_port *port)
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{
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return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
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}
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#endif
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static void sh_serial_init_generic(struct uart_port *port)
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{
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sci_out(port, SCSCR , SCSCR_INIT(port));
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sci_out(port, SCSCR , SCSCR_INIT(port));
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sci_out(port, SCSMR, 0);
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sci_out(port, SCSMR, 0);
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sci_out(port, SCFCR, SCFCR_RFRST|SCFCR_TFRST);
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sci_in(port, SCFCR);
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sci_out(port, SCFCR, 0);
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}
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static void
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sh_serial_setbrg_generic(struct uart_port *port, int clk, int baudrate)
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{
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if (port->clk_mode == EXT_CLK) {
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unsigned short dl = DL_VALUE(baudrate, clk);
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sci_out(port, DL, dl);
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/* Need wait: Clock * 1/dl * 1/16 */
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udelay((1000000 * dl * 16 / clk) * 1000 + 1);
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} else {
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sci_out(port, SCBRR, SCBRR_VALUE(baudrate, clk));
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}
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}
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static void handle_error(struct uart_port *port)
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{
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sci_in(port, SCxSR);
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sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
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sci_in(port, SCLSR);
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sci_out(port, SCLSR, 0x00);
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}
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static int serial_raw_putc(struct uart_port *port, const char c)
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{
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/* Tx fifo is empty */
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if (!(sci_in(port, SCxSR) & SCxSR_TEND(port)))
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return -EAGAIN;
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sci_out(port, SCxTDR, c);
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sci_out(port, SCxSR, sci_in(port, SCxSR) & ~SCxSR_TEND(port));
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return 0;
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}
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static int serial_rx_fifo_level(struct uart_port *port)
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{
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return scif_rxfill(port);
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}
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static int sh_serial_tstc_generic(struct uart_port *port)
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{
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if (sci_in(port, SCxSR) & SCIF_ERRORS) {
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handle_error(port);
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return 0;
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}
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return serial_rx_fifo_level(port) ? 1 : 0;
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}
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static int serial_getc_check(struct uart_port *port)
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{
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unsigned short status;
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status = sci_in(port, SCxSR);
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if (status & SCIF_ERRORS)
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handle_error(port);
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if (sci_in(port, SCLSR) & SCxSR_ORER(port))
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handle_error(port);
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return status & (SCIF_DR | SCxSR_RDxF(port));
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}
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static int sh_serial_getc_generic(struct uart_port *port)
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{
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unsigned short status;
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char ch;
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if (!serial_getc_check(port))
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return -EAGAIN;
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ch = sci_in(port, SCxRDR);
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status = sci_in(port, SCxSR);
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sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
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if (status & SCIF_ERRORS)
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handle_error(port);
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if (sci_in(port, SCLSR) & SCxSR_ORER(port))
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handle_error(port);
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return ch;
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}
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#ifdef CONFIG_DM_SERIAL
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static int sh_serial_pending(struct udevice *dev, bool input)
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{
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struct uart_port *priv = dev_get_priv(dev);
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return sh_serial_tstc_generic(priv);
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}
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static int sh_serial_putc(struct udevice *dev, const char ch)
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{
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struct uart_port *priv = dev_get_priv(dev);
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return serial_raw_putc(priv, ch);
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}
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static int sh_serial_getc(struct udevice *dev)
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{
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struct uart_port *priv = dev_get_priv(dev);
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return sh_serial_getc_generic(priv);
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}
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static int sh_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct sh_serial_platdata *plat = dev_get_platdata(dev);
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struct uart_port *priv = dev_get_priv(dev);
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sh_serial_setbrg_generic(priv, plat->clk, baudrate);
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return 0;
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}
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static int sh_serial_probe(struct udevice *dev)
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{
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struct sh_serial_platdata *plat = dev_get_platdata(dev);
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struct uart_port *priv = dev_get_priv(dev);
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priv->membase = (unsigned char *)plat->base;
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priv->mapbase = plat->base;
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priv->type = plat->type;
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priv->clk_mode = plat->clk_mode;
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sh_serial_init_generic(priv);
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return 0;
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}
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static const struct dm_serial_ops sh_serial_ops = {
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.putc = sh_serial_putc,
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.pending = sh_serial_pending,
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.getc = sh_serial_getc,
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.setbrg = sh_serial_setbrg,
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};
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U_BOOT_DRIVER(serial_sh) = {
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.name = "serial_sh",
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.id = UCLASS_SERIAL,
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.probe = sh_serial_probe,
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.ops = &sh_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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.priv_auto_alloc_size = sizeof(struct uart_port),
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};
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#else /* CONFIG_DM_SERIAL */
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#if defined(CONFIG_CONS_SCIF0)
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# define SCIF_BASE SCIF0_BASE
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#elif defined(CONFIG_CONS_SCIF1)
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# define SCIF_BASE SCIF1_BASE
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#elif defined(CONFIG_CONS_SCIF2)
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# define SCIF_BASE SCIF2_BASE
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#elif defined(CONFIG_CONS_SCIF3)
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# define SCIF_BASE SCIF3_BASE
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#elif defined(CONFIG_CONS_SCIF4)
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# define SCIF_BASE SCIF4_BASE
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#elif defined(CONFIG_CONS_SCIF5)
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# define SCIF_BASE SCIF5_BASE
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#elif defined(CONFIG_CONS_SCIF6)
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# define SCIF_BASE SCIF6_BASE
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#elif defined(CONFIG_CONS_SCIF7)
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# define SCIF_BASE SCIF7_BASE
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#else
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# error "Default SCIF doesn't set....."
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#endif
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#if defined(CONFIG_SCIF_A)
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#define SCIF_BASE_PORT PORT_SCIFA
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#else
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#define SCIF_BASE_PORT PORT_SCIF
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#endif
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static struct uart_port sh_sci = {
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.membase = (unsigned char *)SCIF_BASE,
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.mapbase = SCIF_BASE,
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.type = SCIF_BASE_PORT,
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#ifdef CONFIG_SCIF_USE_EXT_CLK
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.clk_mode = EXT_CLK,
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#endif
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};
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static void sh_serial_setbrg(void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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struct uart_port *port = &sh_sci;
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sh_serial_setbrg_generic(port, CONFIG_SH_SCIF_CLK_FREQ, gd->baudrate);
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}
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static int sh_serial_init(void)
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{
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struct uart_port *port = &sh_sci;
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sh_serial_init_generic(port);
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serial_setbrg();
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return 0;
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}
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static void sh_serial_putc(const char c)
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{
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struct uart_port *port = &sh_sci;
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if (c == '\n') {
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while (1) {
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if (serial_raw_putc(port, '\r') != -EAGAIN)
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break;
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}
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}
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while (1) {
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if (serial_raw_putc(port, c) != -EAGAIN)
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break;
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}
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}
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static int sh_serial_tstc(void)
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{
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struct uart_port *port = &sh_sci;
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return sh_serial_tstc_generic(port);
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}
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static int sh_serial_getc(void)
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{
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struct uart_port *port = &sh_sci;
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int ch;
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while (1) {
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ch = sh_serial_getc_generic(port);
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if (ch != -EAGAIN)
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break;
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}
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return ch;
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}
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static struct serial_device sh_serial_drv = {
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.name = "sh_serial",
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.start = sh_serial_init,
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.stop = NULL,
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.setbrg = sh_serial_setbrg,
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.putc = sh_serial_putc,
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.puts = default_serial_puts,
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.getc = sh_serial_getc,
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.tstc = sh_serial_tstc,
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};
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void sh_serial_initialize(void)
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{
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serial_register(&sh_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &sh_serial_drv;
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}
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#endif /* CONFIG_DM_SERIAL */
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