1405 lines
33 KiB
C
1405 lines
33 KiB
C
/*
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* drivers/serial/sh-sci.c
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*
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* SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
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*
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* Copyright (C) 2002 - 2008 Paul Mundt
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* Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007).
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*
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* based off of the old drivers/char/sh-sci.c by:
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*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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* Copyright (C) 2000 Sugioka Toshinobu
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* Modified to support multiple serial ports. Stuart Menefy (May 2000).
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* Modified to support SecureEdge. David McCullough (2002)
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* Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
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* Removed SH7300 support (Jul 2007).
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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#endif
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#undef DEBUG
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/sysrq.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/console.h>
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#include <linux/platform_device.h>
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#include <linux/serial_sci.h>
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#include <linux/notifier.h>
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#include <linux/cpufreq.h>
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#include <linux/clk.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#ifdef CONFIG_SUPERH
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#include <asm/clock.h>
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#include <asm/sh_bios.h>
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#endif
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#ifdef CONFIG_H8300
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#include <asm/gpio.h>
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#endif
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#include "sh-sci.h"
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struct sci_port {
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struct uart_port port;
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/* Port type */
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unsigned int type;
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/* Port IRQs: ERI, RXI, TXI, BRI (optional) */
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unsigned int irqs[SCIx_NR_IRQS];
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/* Port enable callback */
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void (*enable)(struct uart_port *port);
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/* Port disable callback */
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void (*disable)(struct uart_port *port);
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/* Break timer */
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struct timer_list break_timer;
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int break_flag;
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#ifdef CONFIG_HAVE_CLK
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/* Interface clock */
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struct clk *iclk;
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/* Data clock */
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struct clk *dclk;
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#endif
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struct list_head node;
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};
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struct sh_sci_priv {
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spinlock_t lock;
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struct list_head ports;
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#ifdef CONFIG_HAVE_CLK
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struct notifier_block clk_nb;
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#endif
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};
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/* Function prototypes */
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static void sci_stop_tx(struct uart_port *port);
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#define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
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static struct sci_port sci_ports[SCI_NPORTS];
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static struct uart_driver sci_uart_driver;
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static inline struct sci_port *
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to_sci_port(struct uart_port *uart)
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{
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return container_of(uart, struct sci_port, port);
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}
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#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
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#ifdef CONFIG_CONSOLE_POLL
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static inline void handle_error(struct uart_port *port)
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{
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/* Clear error flags */
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sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
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}
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static int sci_poll_get_char(struct uart_port *port)
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{
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unsigned short status;
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int c;
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do {
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status = sci_in(port, SCxSR);
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if (status & SCxSR_ERRORS(port)) {
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handle_error(port);
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continue;
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}
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} while (!(status & SCxSR_RDxF(port)));
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c = sci_in(port, SCxRDR);
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/* Dummy read */
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sci_in(port, SCxSR);
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sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
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return c;
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}
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#endif
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static void sci_poll_put_char(struct uart_port *port, unsigned char c)
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{
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unsigned short status;
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do {
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status = sci_in(port, SCxSR);
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} while (!(status & SCxSR_TDxE(port)));
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sci_out(port, SCxTDR, c);
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sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port));
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}
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#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
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#if defined(__H8300S__)
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enum { sci_disable, sci_enable };
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static void h8300_sci_config(struct uart_port *port, unsigned int ctrl)
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{
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volatile unsigned char *mstpcrl = (volatile unsigned char *)MSTPCRL;
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int ch = (port->mapbase - SMR0) >> 3;
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unsigned char mask = 1 << (ch+1);
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if (ctrl == sci_disable)
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*mstpcrl |= mask;
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else
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*mstpcrl &= ~mask;
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}
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static void h8300_sci_enable(struct uart_port *port)
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{
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h8300_sci_config(port, sci_enable);
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}
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static void h8300_sci_disable(struct uart_port *port)
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{
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h8300_sci_config(port, sci_disable);
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}
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#endif
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#if defined(__H8300H__) || defined(__H8300S__)
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static void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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int ch = (port->mapbase - SMR0) >> 3;
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/* set DDR regs */
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H8300_GPIO_DDR(h8300_sci_pins[ch].port,
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h8300_sci_pins[ch].rx,
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H8300_GPIO_INPUT);
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H8300_GPIO_DDR(h8300_sci_pins[ch].port,
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h8300_sci_pins[ch].tx,
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H8300_GPIO_OUTPUT);
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/* tx mark output*/
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H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
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}
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#elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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if (port->mapbase == 0xA4400000) {
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__raw_writew(__raw_readw(PACR) & 0xffc0, PACR);
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__raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR);
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} else if (port->mapbase == 0xA4410000)
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__raw_writew(__raw_readw(PBCR) & 0xf003, PBCR);
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}
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#elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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unsigned short data;
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if (cflag & CRTSCTS) {
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/* enable RTS/CTS */
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if (port->mapbase == 0xa4430000) { /* SCIF0 */
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/* Clear PTCR bit 9-2; enable all scif pins but sck */
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data = __raw_readw(PORT_PTCR);
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__raw_writew((data & 0xfc03), PORT_PTCR);
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} else if (port->mapbase == 0xa4438000) { /* SCIF1 */
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/* Clear PVCR bit 9-2 */
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data = __raw_readw(PORT_PVCR);
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__raw_writew((data & 0xfc03), PORT_PVCR);
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}
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} else {
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if (port->mapbase == 0xa4430000) { /* SCIF0 */
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/* Clear PTCR bit 5-2; enable only tx and rx */
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data = __raw_readw(PORT_PTCR);
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__raw_writew((data & 0xffc3), PORT_PTCR);
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} else if (port->mapbase == 0xa4438000) { /* SCIF1 */
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/* Clear PVCR bit 5-2 */
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data = __raw_readw(PORT_PVCR);
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__raw_writew((data & 0xffc3), PORT_PVCR);
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}
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}
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}
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#elif defined(CONFIG_CPU_SH3)
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/* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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unsigned short data;
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/* We need to set SCPCR to enable RTS/CTS */
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data = __raw_readw(SCPCR);
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/* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
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__raw_writew(data & 0x0fcf, SCPCR);
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if (!(cflag & CRTSCTS)) {
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/* We need to set SCPCR to enable RTS/CTS */
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data = __raw_readw(SCPCR);
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/* Clear out SCP7MD1,0, SCP4MD1,0,
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Set SCP6MD1,0 = {01} (output) */
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__raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
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data = ctrl_inb(SCPDR);
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/* Set /RTS2 (bit6) = 0 */
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ctrl_outb(data & 0xbf, SCPDR);
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}
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}
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#elif defined(CONFIG_CPU_SUBTYPE_SH7722)
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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unsigned short data;
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if (port->mapbase == 0xffe00000) {
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data = __raw_readw(PSCR);
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data &= ~0x03cf;
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if (!(cflag & CRTSCTS))
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data |= 0x0340;
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__raw_writew(data, PSCR);
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}
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}
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#elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \
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defined(CONFIG_CPU_SUBTYPE_SH7780) || \
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defined(CONFIG_CPU_SUBTYPE_SH7785) || \
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defined(CONFIG_CPU_SUBTYPE_SH7786) || \
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defined(CONFIG_CPU_SUBTYPE_SHX3)
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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if (!(cflag & CRTSCTS))
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__raw_writew(0x0080, SCSPTR0); /* Set RTS = 1 */
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}
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#elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A)
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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if (!(cflag & CRTSCTS))
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__raw_writew(0x0080, SCSPTR2); /* Set RTS = 1 */
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}
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#else
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static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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{
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/* Nothing to do */
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}
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#endif
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#if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
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defined(CONFIG_CPU_SUBTYPE_SH7780) || \
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defined(CONFIG_CPU_SUBTYPE_SH7785) || \
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defined(CONFIG_CPU_SUBTYPE_SH7786)
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static inline int scif_txroom(struct uart_port *port)
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{
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return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
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}
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static inline int scif_rxroom(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_SUBTYPE_SH7763)
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static inline int scif_txroom(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 SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
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} else {
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/* SCIF2 */
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return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
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}
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}
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static inline int scif_rxroom(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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#else
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static inline int scif_txroom(struct uart_port *port)
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{
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return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
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}
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static inline int scif_rxroom(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 inline int sci_txroom(struct uart_port *port)
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{
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return (sci_in(port, SCxSR) & SCI_TDRE) != 0;
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}
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static inline int sci_rxroom(struct uart_port *port)
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{
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return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
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}
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/* ********************************************************************** *
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* the interrupt related routines *
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* ********************************************************************** */
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static void sci_transmit_chars(struct uart_port *port)
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{
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struct circ_buf *xmit = &port->info->xmit;
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unsigned int stopped = uart_tx_stopped(port);
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unsigned short status;
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unsigned short ctrl;
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int count;
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status = sci_in(port, SCxSR);
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if (!(status & SCxSR_TDxE(port))) {
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ctrl = sci_in(port, SCSCR);
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if (uart_circ_empty(xmit))
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ctrl &= ~SCI_CTRL_FLAGS_TIE;
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else
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ctrl |= SCI_CTRL_FLAGS_TIE;
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sci_out(port, SCSCR, ctrl);
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return;
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}
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if (port->type == PORT_SCI)
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count = sci_txroom(port);
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else
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count = scif_txroom(port);
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do {
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unsigned char c;
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if (port->x_char) {
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c = port->x_char;
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port->x_char = 0;
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} else if (!uart_circ_empty(xmit) && !stopped) {
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c = xmit->buf[xmit->tail];
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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} else {
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break;
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}
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sci_out(port, SCxTDR, c);
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port->icount.tx++;
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} while (--count > 0);
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sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(port);
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if (uart_circ_empty(xmit)) {
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sci_stop_tx(port);
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} else {
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ctrl = sci_in(port, SCSCR);
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if (port->type != PORT_SCI) {
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sci_in(port, SCxSR); /* Dummy read */
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sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
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}
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ctrl |= SCI_CTRL_FLAGS_TIE;
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sci_out(port, SCSCR, ctrl);
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}
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}
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/* On SH3, SCIF may read end-of-break as a space->mark char */
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#define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); })
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static inline void sci_receive_chars(struct uart_port *port)
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{
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struct sci_port *sci_port = to_sci_port(port);
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struct tty_struct *tty = port->info->port.tty;
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int i, count, copied = 0;
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unsigned short status;
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unsigned char flag;
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status = sci_in(port, SCxSR);
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if (!(status & SCxSR_RDxF(port)))
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return;
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while (1) {
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if (port->type == PORT_SCI)
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count = sci_rxroom(port);
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else
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count = scif_rxroom(port);
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/* Don't copy more bytes than there is room for in the buffer */
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count = tty_buffer_request_room(tty, count);
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/* If for any reason we can't copy more data, we're done! */
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if (count == 0)
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break;
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if (port->type == PORT_SCI) {
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char c = sci_in(port, SCxRDR);
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if (uart_handle_sysrq_char(port, c) ||
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sci_port->break_flag)
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count = 0;
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else
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tty_insert_flip_char(tty, c, TTY_NORMAL);
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} else {
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for (i = 0; i < count; i++) {
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char c = sci_in(port, SCxRDR);
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status = sci_in(port, SCxSR);
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#if defined(CONFIG_CPU_SH3)
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/* Skip "chars" during break */
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if (sci_port->break_flag) {
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if ((c == 0) &&
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(status & SCxSR_FER(port))) {
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count--; i--;
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continue;
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}
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/* Nonzero => end-of-break */
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dev_dbg(port->dev, "debounce<%02x>\n", c);
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sci_port->break_flag = 0;
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if (STEPFN(c)) {
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count--; i--;
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continue;
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}
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}
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#endif /* CONFIG_CPU_SH3 */
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if (uart_handle_sysrq_char(port, c)) {
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count--; i--;
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continue;
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}
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/* Store data and status */
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if (status&SCxSR_FER(port)) {
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flag = TTY_FRAME;
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dev_notice(port->dev, "frame error\n");
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} else if (status&SCxSR_PER(port)) {
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flag = TTY_PARITY;
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dev_notice(port->dev, "parity error\n");
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} else
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flag = TTY_NORMAL;
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tty_insert_flip_char(tty, c, flag);
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}
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}
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sci_in(port, SCxSR); /* dummy read */
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sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
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copied += count;
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port->icount.rx += count;
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}
|
|
|
|
if (copied) {
|
|
/* Tell the rest of the system the news. New characters! */
|
|
tty_flip_buffer_push(tty);
|
|
} else {
|
|
sci_in(port, SCxSR); /* dummy read */
|
|
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
|
|
}
|
|
}
|
|
|
|
#define SCI_BREAK_JIFFIES (HZ/20)
|
|
/* The sci generates interrupts during the break,
|
|
* 1 per millisecond or so during the break period, for 9600 baud.
|
|
* So dont bother disabling interrupts.
|
|
* But dont want more than 1 break event.
|
|
* Use a kernel timer to periodically poll the rx line until
|
|
* the break is finished.
|
|
*/
|
|
static void sci_schedule_break_timer(struct sci_port *port)
|
|
{
|
|
port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
|
|
add_timer(&port->break_timer);
|
|
}
|
|
/* Ensure that two consecutive samples find the break over. */
|
|
static void sci_break_timer(unsigned long data)
|
|
{
|
|
struct sci_port *port = (struct sci_port *)data;
|
|
|
|
if (sci_rxd_in(&port->port) == 0) {
|
|
port->break_flag = 1;
|
|
sci_schedule_break_timer(port);
|
|
} else if (port->break_flag == 1) {
|
|
/* break is over. */
|
|
port->break_flag = 2;
|
|
sci_schedule_break_timer(port);
|
|
} else
|
|
port->break_flag = 0;
|
|
}
|
|
|
|
static inline int sci_handle_errors(struct uart_port *port)
|
|
{
|
|
int copied = 0;
|
|
unsigned short status = sci_in(port, SCxSR);
|
|
struct tty_struct *tty = port->info->port.tty;
|
|
|
|
if (status & SCxSR_ORER(port)) {
|
|
/* overrun error */
|
|
if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
|
|
copied++;
|
|
|
|
dev_notice(port->dev, "overrun error");
|
|
}
|
|
|
|
if (status & SCxSR_FER(port)) {
|
|
if (sci_rxd_in(port) == 0) {
|
|
/* Notify of BREAK */
|
|
struct sci_port *sci_port = to_sci_port(port);
|
|
|
|
if (!sci_port->break_flag) {
|
|
sci_port->break_flag = 1;
|
|
sci_schedule_break_timer(sci_port);
|
|
|
|
/* Do sysrq handling. */
|
|
if (uart_handle_break(port))
|
|
return 0;
|
|
|
|
dev_dbg(port->dev, "BREAK detected\n");
|
|
|
|
if (tty_insert_flip_char(tty, 0, TTY_BREAK))
|
|
copied++;
|
|
}
|
|
|
|
} else {
|
|
/* frame error */
|
|
if (tty_insert_flip_char(tty, 0, TTY_FRAME))
|
|
copied++;
|
|
|
|
dev_notice(port->dev, "frame error\n");
|
|
}
|
|
}
|
|
|
|
if (status & SCxSR_PER(port)) {
|
|
/* parity error */
|
|
if (tty_insert_flip_char(tty, 0, TTY_PARITY))
|
|
copied++;
|
|
|
|
dev_notice(port->dev, "parity error");
|
|
}
|
|
|
|
if (copied)
|
|
tty_flip_buffer_push(tty);
|
|
|
|
return copied;
|
|
}
|
|
|
|
static inline int sci_handle_fifo_overrun(struct uart_port *port)
|
|
{
|
|
struct tty_struct *tty = port->info->port.tty;
|
|
int copied = 0;
|
|
|
|
if (port->type != PORT_SCIF)
|
|
return 0;
|
|
|
|
if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
|
|
sci_out(port, SCLSR, 0);
|
|
|
|
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
|
tty_flip_buffer_push(tty);
|
|
|
|
dev_notice(port->dev, "overrun error\n");
|
|
copied++;
|
|
}
|
|
|
|
return copied;
|
|
}
|
|
|
|
static inline int sci_handle_breaks(struct uart_port *port)
|
|
{
|
|
int copied = 0;
|
|
unsigned short status = sci_in(port, SCxSR);
|
|
struct tty_struct *tty = port->info->port.tty;
|
|
struct sci_port *s = to_sci_port(port);
|
|
|
|
if (uart_handle_break(port))
|
|
return 0;
|
|
|
|
if (!s->break_flag && status & SCxSR_BRK(port)) {
|
|
#if defined(CONFIG_CPU_SH3)
|
|
/* Debounce break */
|
|
s->break_flag = 1;
|
|
#endif
|
|
/* Notify of BREAK */
|
|
if (tty_insert_flip_char(tty, 0, TTY_BREAK))
|
|
copied++;
|
|
|
|
dev_dbg(port->dev, "BREAK detected\n");
|
|
}
|
|
|
|
if (copied)
|
|
tty_flip_buffer_push(tty);
|
|
|
|
copied += sci_handle_fifo_overrun(port);
|
|
|
|
return copied;
|
|
}
|
|
|
|
static irqreturn_t sci_rx_interrupt(int irq, void *port)
|
|
{
|
|
/* I think sci_receive_chars has to be called irrespective
|
|
* of whether the I_IXOFF is set, otherwise, how is the interrupt
|
|
* to be disabled?
|
|
*/
|
|
sci_receive_chars(port);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
|
|
{
|
|
struct uart_port *port = ptr;
|
|
|
|
spin_lock_irq(&port->lock);
|
|
sci_transmit_chars(port);
|
|
spin_unlock_irq(&port->lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t sci_er_interrupt(int irq, void *ptr)
|
|
{
|
|
struct uart_port *port = ptr;
|
|
|
|
/* Handle errors */
|
|
if (port->type == PORT_SCI) {
|
|
if (sci_handle_errors(port)) {
|
|
/* discard character in rx buffer */
|
|
sci_in(port, SCxSR);
|
|
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
|
|
}
|
|
} else {
|
|
sci_handle_fifo_overrun(port);
|
|
sci_rx_interrupt(irq, ptr);
|
|
}
|
|
|
|
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
|
|
|
|
/* Kick the transmission */
|
|
sci_tx_interrupt(irq, ptr);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t sci_br_interrupt(int irq, void *ptr)
|
|
{
|
|
struct uart_port *port = ptr;
|
|
|
|
/* Handle BREAKs */
|
|
sci_handle_breaks(port);
|
|
sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
|
|
{
|
|
unsigned short ssr_status, scr_status;
|
|
struct uart_port *port = ptr;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
|
|
ssr_status = sci_in(port, SCxSR);
|
|
scr_status = sci_in(port, SCSCR);
|
|
|
|
/* Tx Interrupt */
|
|
if ((ssr_status & 0x0020) && (scr_status & SCI_CTRL_FLAGS_TIE))
|
|
ret = sci_tx_interrupt(irq, ptr);
|
|
/* Rx Interrupt */
|
|
if ((ssr_status & 0x0002) && (scr_status & SCI_CTRL_FLAGS_RIE))
|
|
ret = sci_rx_interrupt(irq, ptr);
|
|
/* Error Interrupt */
|
|
if ((ssr_status & 0x0080) && (scr_status & SCI_CTRL_FLAGS_REIE))
|
|
ret = sci_er_interrupt(irq, ptr);
|
|
/* Break Interrupt */
|
|
if ((ssr_status & 0x0010) && (scr_status & SCI_CTRL_FLAGS_REIE))
|
|
ret = sci_br_interrupt(irq, ptr);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_CLK
|
|
/*
|
|
* Here we define a transistion notifier so that we can update all of our
|
|
* ports' baud rate when the peripheral clock changes.
|
|
*/
|
|
static int sci_notifier(struct notifier_block *self,
|
|
unsigned long phase, void *p)
|
|
{
|
|
struct sh_sci_priv *priv = container_of(self,
|
|
struct sh_sci_priv, clk_nb);
|
|
struct sci_port *sci_port;
|
|
unsigned long flags;
|
|
|
|
if ((phase == CPUFREQ_POSTCHANGE) ||
|
|
(phase == CPUFREQ_RESUMECHANGE)) {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_for_each_entry(sci_port, &priv->ports, node)
|
|
sci_port->port.uartclk = clk_get_rate(sci_port->dclk);
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static void sci_clk_enable(struct uart_port *port)
|
|
{
|
|
struct sci_port *sci_port = to_sci_port(port);
|
|
|
|
clk_enable(sci_port->dclk);
|
|
sci_port->port.uartclk = clk_get_rate(sci_port->dclk);
|
|
|
|
if (sci_port->iclk)
|
|
clk_enable(sci_port->iclk);
|
|
}
|
|
|
|
static void sci_clk_disable(struct uart_port *port)
|
|
{
|
|
struct sci_port *sci_port = to_sci_port(port);
|
|
|
|
if (sci_port->iclk)
|
|
clk_disable(sci_port->iclk);
|
|
|
|
clk_disable(sci_port->dclk);
|
|
}
|
|
#endif
|
|
|
|
static int sci_request_irq(struct sci_port *port)
|
|
{
|
|
int i;
|
|
irqreturn_t (*handlers[4])(int irq, void *ptr) = {
|
|
sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
|
|
sci_br_interrupt,
|
|
};
|
|
const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
|
|
"SCI Transmit Data Empty", "SCI Break" };
|
|
|
|
if (port->irqs[0] == port->irqs[1]) {
|
|
if (unlikely(!port->irqs[0]))
|
|
return -ENODEV;
|
|
|
|
if (request_irq(port->irqs[0], sci_mpxed_interrupt,
|
|
IRQF_DISABLED, "sci", port)) {
|
|
dev_err(port->port.dev, "Can't allocate IRQ\n");
|
|
return -ENODEV;
|
|
}
|
|
} else {
|
|
for (i = 0; i < ARRAY_SIZE(handlers); i++) {
|
|
if (unlikely(!port->irqs[i]))
|
|
continue;
|
|
|
|
if (request_irq(port->irqs[i], handlers[i],
|
|
IRQF_DISABLED, desc[i], port)) {
|
|
dev_err(port->port.dev, "Can't allocate IRQ\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sci_free_irq(struct sci_port *port)
|
|
{
|
|
int i;
|
|
|
|
if (port->irqs[0] == port->irqs[1])
|
|
free_irq(port->irqs[0], port);
|
|
else {
|
|
for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
|
|
if (!port->irqs[i])
|
|
continue;
|
|
|
|
free_irq(port->irqs[i], port);
|
|
}
|
|
}
|
|
}
|
|
|
|
static unsigned int sci_tx_empty(struct uart_port *port)
|
|
{
|
|
/* Can't detect */
|
|
return TIOCSER_TEMT;
|
|
}
|
|
|
|
static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
|
|
{
|
|
/* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
|
|
/* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
|
|
/* If you have signals for DTR and DCD, please implement here. */
|
|
}
|
|
|
|
static unsigned int sci_get_mctrl(struct uart_port *port)
|
|
{
|
|
/* This routine is used for geting signals of: DTR, DCD, DSR, RI,
|
|
and CTS/RTS */
|
|
|
|
return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
|
|
}
|
|
|
|
static void sci_start_tx(struct uart_port *port)
|
|
{
|
|
unsigned short ctrl;
|
|
|
|
/* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
|
|
ctrl = sci_in(port, SCSCR);
|
|
ctrl |= SCI_CTRL_FLAGS_TIE;
|
|
sci_out(port, SCSCR, ctrl);
|
|
}
|
|
|
|
static void sci_stop_tx(struct uart_port *port)
|
|
{
|
|
unsigned short ctrl;
|
|
|
|
/* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
|
|
ctrl = sci_in(port, SCSCR);
|
|
ctrl &= ~SCI_CTRL_FLAGS_TIE;
|
|
sci_out(port, SCSCR, ctrl);
|
|
}
|
|
|
|
static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
|
|
{
|
|
unsigned short ctrl;
|
|
|
|
/* Set RIE (Receive Interrupt Enable) bit in SCSCR */
|
|
ctrl = sci_in(port, SCSCR);
|
|
ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
|
|
sci_out(port, SCSCR, ctrl);
|
|
}
|
|
|
|
static void sci_stop_rx(struct uart_port *port)
|
|
{
|
|
unsigned short ctrl;
|
|
|
|
/* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
|
|
ctrl = sci_in(port, SCSCR);
|
|
ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
|
|
sci_out(port, SCSCR, ctrl);
|
|
}
|
|
|
|
static void sci_enable_ms(struct uart_port *port)
|
|
{
|
|
/* Nothing here yet .. */
|
|
}
|
|
|
|
static void sci_break_ctl(struct uart_port *port, int break_state)
|
|
{
|
|
/* Nothing here yet .. */
|
|
}
|
|
|
|
static int sci_startup(struct uart_port *port)
|
|
{
|
|
struct sci_port *s = to_sci_port(port);
|
|
|
|
if (s->enable)
|
|
s->enable(port);
|
|
|
|
sci_request_irq(s);
|
|
sci_start_tx(port);
|
|
sci_start_rx(port, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sci_shutdown(struct uart_port *port)
|
|
{
|
|
struct sci_port *s = to_sci_port(port);
|
|
|
|
sci_stop_rx(port);
|
|
sci_stop_tx(port);
|
|
sci_free_irq(s);
|
|
|
|
if (s->disable)
|
|
s->disable(port);
|
|
}
|
|
|
|
static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
|
|
struct ktermios *old)
|
|
{
|
|
unsigned int status, baud, smr_val;
|
|
int t = -1;
|
|
|
|
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
|
|
if (likely(baud))
|
|
t = SCBRR_VALUE(baud, port->uartclk);
|
|
|
|
do {
|
|
status = sci_in(port, SCxSR);
|
|
} while (!(status & SCxSR_TEND(port)));
|
|
|
|
sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
|
|
|
|
if (port->type != PORT_SCI)
|
|
sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
|
|
|
|
smr_val = sci_in(port, SCSMR) & 3;
|
|
if ((termios->c_cflag & CSIZE) == CS7)
|
|
smr_val |= 0x40;
|
|
if (termios->c_cflag & PARENB)
|
|
smr_val |= 0x20;
|
|
if (termios->c_cflag & PARODD)
|
|
smr_val |= 0x30;
|
|
if (termios->c_cflag & CSTOPB)
|
|
smr_val |= 0x08;
|
|
|
|
uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
|
sci_out(port, SCSMR, smr_val);
|
|
|
|
if (t > 0) {
|
|
if (t >= 256) {
|
|
sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
|
|
t >>= 2;
|
|
} else
|
|
sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
|
|
|
|
sci_out(port, SCBRR, t);
|
|
udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
|
|
}
|
|
|
|
sci_init_pins(port, termios->c_cflag);
|
|
sci_out(port, SCFCR, (termios->c_cflag & CRTSCTS) ? SCFCR_MCE : 0);
|
|
|
|
sci_out(port, SCSCR, SCSCR_INIT(port));
|
|
|
|
if ((termios->c_cflag & CREAD) != 0)
|
|
sci_start_rx(port, 0);
|
|
}
|
|
|
|
static const char *sci_type(struct uart_port *port)
|
|
{
|
|
switch (port->type) {
|
|
case PORT_IRDA:
|
|
return "irda";
|
|
case PORT_SCI:
|
|
return "sci";
|
|
case PORT_SCIF:
|
|
return "scif";
|
|
case PORT_SCIFA:
|
|
return "scifa";
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void sci_release_port(struct uart_port *port)
|
|
{
|
|
/* Nothing here yet .. */
|
|
}
|
|
|
|
static int sci_request_port(struct uart_port *port)
|
|
{
|
|
/* Nothing here yet .. */
|
|
return 0;
|
|
}
|
|
|
|
static void sci_config_port(struct uart_port *port, int flags)
|
|
{
|
|
struct sci_port *s = to_sci_port(port);
|
|
|
|
port->type = s->type;
|
|
|
|
if (port->membase)
|
|
return;
|
|
|
|
if (port->flags & UPF_IOREMAP) {
|
|
port->membase = ioremap_nocache(port->mapbase, 0x40);
|
|
|
|
if (IS_ERR(port->membase))
|
|
dev_err(port->dev, "can't remap port#%d\n", port->line);
|
|
} else {
|
|
/*
|
|
* For the simple (and majority of) cases where we don't
|
|
* need to do any remapping, just cast the cookie
|
|
* directly.
|
|
*/
|
|
port->membase = (void __iomem *)port->mapbase;
|
|
}
|
|
}
|
|
|
|
static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
{
|
|
struct sci_port *s = to_sci_port(port);
|
|
|
|
if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
|
|
return -EINVAL;
|
|
if (ser->baud_base < 2400)
|
|
/* No paper tape reader for Mitch.. */
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct uart_ops sci_uart_ops = {
|
|
.tx_empty = sci_tx_empty,
|
|
.set_mctrl = sci_set_mctrl,
|
|
.get_mctrl = sci_get_mctrl,
|
|
.start_tx = sci_start_tx,
|
|
.stop_tx = sci_stop_tx,
|
|
.stop_rx = sci_stop_rx,
|
|
.enable_ms = sci_enable_ms,
|
|
.break_ctl = sci_break_ctl,
|
|
.startup = sci_startup,
|
|
.shutdown = sci_shutdown,
|
|
.set_termios = sci_set_termios,
|
|
.type = sci_type,
|
|
.release_port = sci_release_port,
|
|
.request_port = sci_request_port,
|
|
.config_port = sci_config_port,
|
|
.verify_port = sci_verify_port,
|
|
#ifdef CONFIG_CONSOLE_POLL
|
|
.poll_get_char = sci_poll_get_char,
|
|
.poll_put_char = sci_poll_put_char,
|
|
#endif
|
|
};
|
|
|
|
static void __devinit sci_init_single(struct platform_device *dev,
|
|
struct sci_port *sci_port,
|
|
unsigned int index,
|
|
struct plat_sci_port *p)
|
|
{
|
|
sci_port->port.ops = &sci_uart_ops;
|
|
sci_port->port.iotype = UPIO_MEM;
|
|
sci_port->port.line = index;
|
|
sci_port->port.fifosize = 1;
|
|
|
|
#if defined(__H8300H__) || defined(__H8300S__)
|
|
#ifdef __H8300S__
|
|
sci_port->enable = h8300_sci_enable;
|
|
sci_port->disable = h8300_sci_disable;
|
|
#endif
|
|
sci_port->port.uartclk = CONFIG_CPU_CLOCK;
|
|
#elif defined(CONFIG_HAVE_CLK)
|
|
sci_port->iclk = p->clk ? clk_get(&dev->dev, p->clk) : NULL;
|
|
sci_port->dclk = clk_get(&dev->dev, "peripheral_clk");
|
|
sci_port->enable = sci_clk_enable;
|
|
sci_port->disable = sci_clk_disable;
|
|
#else
|
|
#error "Need a valid uartclk"
|
|
#endif
|
|
|
|
sci_port->break_timer.data = (unsigned long)sci_port;
|
|
sci_port->break_timer.function = sci_break_timer;
|
|
init_timer(&sci_port->break_timer);
|
|
|
|
sci_port->port.mapbase = p->mapbase;
|
|
sci_port->port.membase = p->membase;
|
|
|
|
sci_port->port.irq = p->irqs[SCIx_TXI_IRQ];
|
|
sci_port->port.flags = p->flags;
|
|
sci_port->port.dev = &dev->dev;
|
|
sci_port->type = sci_port->port.type = p->type;
|
|
|
|
memcpy(&sci_port->irqs, &p->irqs, sizeof(p->irqs));
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
|
|
static struct tty_driver *serial_console_device(struct console *co, int *index)
|
|
{
|
|
struct uart_driver *p = &sci_uart_driver;
|
|
*index = co->index;
|
|
return p->tty_driver;
|
|
}
|
|
|
|
static void serial_console_putchar(struct uart_port *port, int ch)
|
|
{
|
|
sci_poll_put_char(port, ch);
|
|
}
|
|
|
|
/*
|
|
* Print a string to the serial port trying not to disturb
|
|
* any possible real use of the port...
|
|
*/
|
|
static void serial_console_write(struct console *co, const char *s,
|
|
unsigned count)
|
|
{
|
|
struct uart_port *port = co->data;
|
|
struct sci_port *sci_port = to_sci_port(port);
|
|
unsigned short bits;
|
|
|
|
if (sci_port->enable)
|
|
sci_port->enable(port);
|
|
|
|
uart_console_write(port, s, count, serial_console_putchar);
|
|
|
|
/* wait until fifo is empty and last bit has been transmitted */
|
|
bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
|
|
while ((sci_in(port, SCxSR) & bits) != bits)
|
|
cpu_relax();
|
|
|
|
if (sci_port->disable);
|
|
sci_port->disable(port);
|
|
}
|
|
|
|
static int __init serial_console_setup(struct console *co, char *options)
|
|
{
|
|
struct sci_port *sci_port;
|
|
struct uart_port *port;
|
|
int baud = 115200;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
int ret;
|
|
|
|
/*
|
|
* Check whether an invalid uart number has been specified, and
|
|
* if so, search for the first available port that does have
|
|
* console support.
|
|
*/
|
|
if (co->index >= SCI_NPORTS)
|
|
co->index = 0;
|
|
|
|
sci_port = &sci_ports[co->index];
|
|
port = &sci_port->port;
|
|
co->data = port;
|
|
|
|
/*
|
|
* Also need to check port->type, we don't actually have any
|
|
* UPIO_PORT ports, but uart_report_port() handily misreports
|
|
* it anyways if we don't have a port available by the time this is
|
|
* called.
|
|
*/
|
|
if (!port->type)
|
|
return -ENODEV;
|
|
|
|
sci_config_port(port, 0);
|
|
|
|
if (sci_port->enable)
|
|
sci_port->enable(port);
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
ret = uart_set_options(port, co, baud, parity, bits, flow);
|
|
#if defined(__H8300H__) || defined(__H8300S__)
|
|
/* disable rx interrupt */
|
|
if (ret == 0)
|
|
sci_stop_rx(port);
|
|
#endif
|
|
/* TODO: disable clock */
|
|
return ret;
|
|
}
|
|
|
|
static struct console serial_console = {
|
|
.name = "ttySC",
|
|
.device = serial_console_device,
|
|
.write = serial_console_write,
|
|
.setup = serial_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
static int __init sci_console_init(void)
|
|
{
|
|
register_console(&serial_console);
|
|
return 0;
|
|
}
|
|
console_initcall(sci_console_init);
|
|
#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
|
|
|
|
#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
|
|
#define SCI_CONSOLE (&serial_console)
|
|
#else
|
|
#define SCI_CONSOLE 0
|
|
#endif
|
|
|
|
static char banner[] __initdata =
|
|
KERN_INFO "SuperH SCI(F) driver initialized\n";
|
|
|
|
static struct uart_driver sci_uart_driver = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = "sci",
|
|
.dev_name = "ttySC",
|
|
.major = SCI_MAJOR,
|
|
.minor = SCI_MINOR_START,
|
|
.nr = SCI_NPORTS,
|
|
.cons = SCI_CONSOLE,
|
|
};
|
|
|
|
|
|
static int sci_remove(struct platform_device *dev)
|
|
{
|
|
struct sh_sci_priv *priv = platform_get_drvdata(dev);
|
|
struct sci_port *p;
|
|
unsigned long flags;
|
|
|
|
#ifdef CONFIG_HAVE_CLK
|
|
cpufreq_unregister_notifier(&priv->clk_nb, CPUFREQ_TRANSITION_NOTIFIER);
|
|
#endif
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_for_each_entry(p, &priv->ports, node)
|
|
uart_remove_one_port(&sci_uart_driver, &p->port);
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
kfree(priv);
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit sci_probe_single(struct platform_device *dev,
|
|
unsigned int index,
|
|
struct plat_sci_port *p,
|
|
struct sci_port *sciport)
|
|
{
|
|
struct sh_sci_priv *priv = platform_get_drvdata(dev);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
/* Sanity check */
|
|
if (unlikely(index >= SCI_NPORTS)) {
|
|
dev_notice(&dev->dev, "Attempting to register port "
|
|
"%d when only %d are available.\n",
|
|
index+1, SCI_NPORTS);
|
|
dev_notice(&dev->dev, "Consider bumping "
|
|
"CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
|
|
return 0;
|
|
}
|
|
|
|
sci_init_single(dev, sciport, index, p);
|
|
|
|
ret = uart_add_one_port(&sci_uart_driver, &sciport->port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
INIT_LIST_HEAD(&sciport->node);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_add(&sciport->node, &priv->ports);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Register a set of serial devices attached to a platform device. The
|
|
* list is terminated with a zero flags entry, which means we expect
|
|
* all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
|
|
* remapping (such as sh64) should also set UPF_IOREMAP.
|
|
*/
|
|
static int __devinit sci_probe(struct platform_device *dev)
|
|
{
|
|
struct plat_sci_port *p = dev->dev.platform_data;
|
|
struct sh_sci_priv *priv;
|
|
int i, ret = -EINVAL;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&priv->ports);
|
|
spin_lock_init(&priv->lock);
|
|
platform_set_drvdata(dev, priv);
|
|
|
|
#ifdef CONFIG_HAVE_CLK
|
|
priv->clk_nb.notifier_call = sci_notifier;
|
|
cpufreq_register_notifier(&priv->clk_nb, CPUFREQ_TRANSITION_NOTIFIER);
|
|
#endif
|
|
|
|
if (dev->id != -1) {
|
|
ret = sci_probe_single(dev, dev->id, p, &sci_ports[dev->id]);
|
|
if (ret)
|
|
goto err_unreg;
|
|
} else {
|
|
for (i = 0; p && p->flags != 0; p++, i++) {
|
|
ret = sci_probe_single(dev, i, p, &sci_ports[i]);
|
|
if (ret)
|
|
goto err_unreg;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SH_STANDARD_BIOS
|
|
sh_bios_gdb_detach();
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
err_unreg:
|
|
sci_remove(dev);
|
|
return ret;
|
|
}
|
|
|
|
static int sci_suspend(struct device *dev)
|
|
{
|
|
struct sh_sci_priv *priv = dev_get_drvdata(dev);
|
|
struct sci_port *p;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_for_each_entry(p, &priv->ports, node)
|
|
uart_suspend_port(&sci_uart_driver, &p->port);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sci_resume(struct device *dev)
|
|
{
|
|
struct sh_sci_priv *priv = dev_get_drvdata(dev);
|
|
struct sci_port *p;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_for_each_entry(p, &priv->ports, node)
|
|
uart_resume_port(&sci_uart_driver, &p->port);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dev_pm_ops sci_dev_pm_ops = {
|
|
.suspend = sci_suspend,
|
|
.resume = sci_resume,
|
|
};
|
|
|
|
static struct platform_driver sci_driver = {
|
|
.probe = sci_probe,
|
|
.remove = __devexit_p(sci_remove),
|
|
.driver = {
|
|
.name = "sh-sci",
|
|
.owner = THIS_MODULE,
|
|
.pm = &sci_dev_pm_ops,
|
|
},
|
|
};
|
|
|
|
static int __init sci_init(void)
|
|
{
|
|
int ret;
|
|
|
|
printk(banner);
|
|
|
|
ret = uart_register_driver(&sci_uart_driver);
|
|
if (likely(ret == 0)) {
|
|
ret = platform_driver_register(&sci_driver);
|
|
if (unlikely(ret))
|
|
uart_unregister_driver(&sci_uart_driver);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit sci_exit(void)
|
|
{
|
|
platform_driver_unregister(&sci_driver);
|
|
uart_unregister_driver(&sci_uart_driver);
|
|
}
|
|
|
|
module_init(sci_init);
|
|
module_exit(sci_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:sh-sci");
|