forked from Minki/linux
d57f341ba0
This patch adds the driver for the built-in UART of the Atheros AR933X SoCs. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Cc: linux-mips@linux-mips.org Cc: Kathy Giori <kgiori@qca.qualcomm.com> Cc: "Luis R. Rodriguez" <rodrigue@qca.qualcomm.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: linux-serial@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/2526/ Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
689 lines
16 KiB
C
689 lines
16 KiB
C
/*
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* Atheros AR933X SoC built-in UART driver
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/sysrq.h>
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#include <linux/delay.h>
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#include <linux/platform_device.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_core.h>
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#include <linux/serial.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <asm/mach-ath79/ar933x_uart.h>
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#include <asm/mach-ath79/ar933x_uart_platform.h>
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#define DRIVER_NAME "ar933x-uart"
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#define AR933X_DUMMY_STATUS_RD 0x01
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static struct uart_driver ar933x_uart_driver;
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struct ar933x_uart_port {
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struct uart_port port;
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unsigned int ier; /* shadow Interrupt Enable Register */
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};
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static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
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int offset)
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{
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return readl(up->port.membase + offset);
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}
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static inline void ar933x_uart_write(struct ar933x_uart_port *up,
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int offset, unsigned int value)
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{
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writel(value, up->port.membase + offset);
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}
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static inline void ar933x_uart_rmw(struct ar933x_uart_port *up,
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unsigned int offset,
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unsigned int mask,
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unsigned int val)
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{
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unsigned int t;
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t = ar933x_uart_read(up, offset);
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t &= ~mask;
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t |= val;
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ar933x_uart_write(up, offset, t);
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}
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static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up,
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unsigned int offset,
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unsigned int val)
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{
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ar933x_uart_rmw(up, offset, 0, val);
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}
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static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up,
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unsigned int offset,
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unsigned int val)
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{
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ar933x_uart_rmw(up, offset, val, 0);
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}
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static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up)
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{
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up->ier |= AR933X_UART_INT_TX_EMPTY;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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}
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static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up)
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{
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up->ier &= ~AR933X_UART_INT_TX_EMPTY;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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}
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static inline void ar933x_uart_putc(struct ar933x_uart_port *up, int ch)
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{
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unsigned int rdata;
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rdata = ch & AR933X_UART_DATA_TX_RX_MASK;
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rdata |= AR933X_UART_DATA_TX_CSR;
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ar933x_uart_write(up, AR933X_UART_DATA_REG, rdata);
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}
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static unsigned int ar933x_uart_tx_empty(struct uart_port *port)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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unsigned long flags;
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unsigned int rdata;
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spin_lock_irqsave(&up->port.lock, flags);
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rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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spin_unlock_irqrestore(&up->port.lock, flags);
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return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT;
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}
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static unsigned int ar933x_uart_get_mctrl(struct uart_port *port)
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{
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return TIOCM_CAR;
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}
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static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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}
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static void ar933x_uart_start_tx(struct uart_port *port)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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ar933x_uart_start_tx_interrupt(up);
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}
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static void ar933x_uart_stop_tx(struct uart_port *port)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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ar933x_uart_stop_tx_interrupt(up);
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}
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static void ar933x_uart_stop_rx(struct uart_port *port)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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up->ier &= ~AR933X_UART_INT_RX_VALID;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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}
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static void ar933x_uart_break_ctl(struct uart_port *port, int break_state)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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unsigned long flags;
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spin_lock_irqsave(&up->port.lock, flags);
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if (break_state == -1)
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_TX_BREAK);
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else
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ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_TX_BREAK);
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spin_unlock_irqrestore(&up->port.lock, flags);
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}
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static void ar933x_uart_enable_ms(struct uart_port *port)
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{
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}
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static void ar933x_uart_set_termios(struct uart_port *port,
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struct ktermios *new,
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struct ktermios *old)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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unsigned int cs;
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unsigned long flags;
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unsigned int baud, scale;
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/* Only CS8 is supported */
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new->c_cflag &= ~CSIZE;
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new->c_cflag |= CS8;
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/* Only one stop bit is supported */
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new->c_cflag &= ~CSTOPB;
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cs = 0;
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if (new->c_cflag & PARENB) {
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if (!(new->c_cflag & PARODD))
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cs |= AR933X_UART_CS_PARITY_EVEN;
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else
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cs |= AR933X_UART_CS_PARITY_ODD;
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} else {
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cs |= AR933X_UART_CS_PARITY_NONE;
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}
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/* Mark/space parity is not supported */
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new->c_cflag &= ~CMSPAR;
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baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
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scale = (port->uartclk / (16 * baud)) - 1;
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/*
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* Ok, we're now changing the port state. Do it with
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* interrupts disabled.
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*/
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spin_lock_irqsave(&up->port.lock, flags);
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/* Update the per-port timeout. */
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uart_update_timeout(port, new->c_cflag, baud);
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up->port.ignore_status_mask = 0;
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/* ignore all characters if CREAD is not set */
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if ((new->c_cflag & CREAD) == 0)
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up->port.ignore_status_mask |= AR933X_DUMMY_STATUS_RD;
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ar933x_uart_write(up, AR933X_UART_CLOCK_REG,
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scale << AR933X_UART_CLOCK_SCALE_S | 8192);
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/* setup configuration register */
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ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_PARITY_M, cs);
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/* enable host interrupt */
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_HOST_INT_EN);
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spin_unlock_irqrestore(&up->port.lock, flags);
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if (tty_termios_baud_rate(new))
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tty_termios_encode_baud_rate(new, baud, baud);
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}
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static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
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{
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struct tty_struct *tty;
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int max_count = 256;
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tty = tty_port_tty_get(&up->port.state->port);
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do {
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unsigned int rdata;
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unsigned char ch;
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rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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if ((rdata & AR933X_UART_DATA_RX_CSR) == 0)
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break;
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/* remove the character from the FIFO */
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ar933x_uart_write(up, AR933X_UART_DATA_REG,
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AR933X_UART_DATA_RX_CSR);
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if (!tty) {
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/* discard the data if no tty available */
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continue;
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}
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up->port.icount.rx++;
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ch = rdata & AR933X_UART_DATA_TX_RX_MASK;
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if (uart_handle_sysrq_char(&up->port, ch))
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continue;
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if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0)
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tty_insert_flip_char(tty, ch, TTY_NORMAL);
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} while (max_count-- > 0);
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if (tty) {
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tty_flip_buffer_push(tty);
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tty_kref_put(tty);
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}
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}
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static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
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{
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struct circ_buf *xmit = &up->port.state->xmit;
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int count;
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if (uart_tx_stopped(&up->port))
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return;
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count = up->port.fifosize;
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do {
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unsigned int rdata;
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rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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if ((rdata & AR933X_UART_DATA_TX_CSR) == 0)
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break;
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if (up->port.x_char) {
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ar933x_uart_putc(up, up->port.x_char);
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up->port.icount.tx++;
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up->port.x_char = 0;
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continue;
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}
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if (uart_circ_empty(xmit))
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break;
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ar933x_uart_putc(up, xmit->buf[xmit->tail]);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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up->port.icount.tx++;
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} while (--count > 0);
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&up->port);
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if (!uart_circ_empty(xmit))
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ar933x_uart_start_tx_interrupt(up);
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}
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static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id)
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{
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struct ar933x_uart_port *up = dev_id;
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unsigned int status;
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status = ar933x_uart_read(up, AR933X_UART_CS_REG);
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if ((status & AR933X_UART_CS_HOST_INT) == 0)
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return IRQ_NONE;
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spin_lock(&up->port.lock);
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status = ar933x_uart_read(up, AR933X_UART_INT_REG);
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status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
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if (status & AR933X_UART_INT_RX_VALID) {
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ar933x_uart_write(up, AR933X_UART_INT_REG,
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AR933X_UART_INT_RX_VALID);
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ar933x_uart_rx_chars(up);
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}
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if (status & AR933X_UART_INT_TX_EMPTY) {
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ar933x_uart_write(up, AR933X_UART_INT_REG,
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AR933X_UART_INT_TX_EMPTY);
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ar933x_uart_stop_tx_interrupt(up);
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ar933x_uart_tx_chars(up);
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}
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spin_unlock(&up->port.lock);
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return IRQ_HANDLED;
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}
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static int ar933x_uart_startup(struct uart_port *port)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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unsigned long flags;
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int ret;
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ret = request_irq(up->port.irq, ar933x_uart_interrupt,
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up->port.irqflags, dev_name(up->port.dev), up);
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if (ret)
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return ret;
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spin_lock_irqsave(&up->port.lock, flags);
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/* Enable HOST interrupts */
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_HOST_INT_EN);
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/* Enable RX interrupts */
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up->ier = AR933X_UART_INT_RX_VALID;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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spin_unlock_irqrestore(&up->port.lock, flags);
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return 0;
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}
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static void ar933x_uart_shutdown(struct uart_port *port)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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/* Disable all interrupts */
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up->ier = 0;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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/* Disable break condition */
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ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_TX_BREAK);
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free_irq(up->port.irq, up);
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}
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static const char *ar933x_uart_type(struct uart_port *port)
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{
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return (port->type == PORT_AR933X) ? "AR933X UART" : NULL;
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}
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static void ar933x_uart_release_port(struct uart_port *port)
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{
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/* Nothing to release ... */
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}
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static int ar933x_uart_request_port(struct uart_port *port)
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{
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/* UARTs always present */
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return 0;
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}
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static void ar933x_uart_config_port(struct uart_port *port, int flags)
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{
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if (flags & UART_CONFIG_TYPE)
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port->type = PORT_AR933X;
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}
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static int ar933x_uart_verify_port(struct uart_port *port,
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struct serial_struct *ser)
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{
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if (ser->type != PORT_UNKNOWN &&
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ser->type != PORT_AR933X)
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return -EINVAL;
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if (ser->irq < 0 || ser->irq >= NR_IRQS)
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return -EINVAL;
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if (ser->baud_base < 28800)
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return -EINVAL;
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return 0;
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}
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static struct uart_ops ar933x_uart_ops = {
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.tx_empty = ar933x_uart_tx_empty,
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.set_mctrl = ar933x_uart_set_mctrl,
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.get_mctrl = ar933x_uart_get_mctrl,
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.stop_tx = ar933x_uart_stop_tx,
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.start_tx = ar933x_uart_start_tx,
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.stop_rx = ar933x_uart_stop_rx,
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.enable_ms = ar933x_uart_enable_ms,
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.break_ctl = ar933x_uart_break_ctl,
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.startup = ar933x_uart_startup,
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.shutdown = ar933x_uart_shutdown,
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.set_termios = ar933x_uart_set_termios,
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.type = ar933x_uart_type,
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.release_port = ar933x_uart_release_port,
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.request_port = ar933x_uart_request_port,
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.config_port = ar933x_uart_config_port,
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.verify_port = ar933x_uart_verify_port,
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};
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#ifdef CONFIG_SERIAL_AR933X_CONSOLE
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static struct ar933x_uart_port *
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ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
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static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up)
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{
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unsigned int status;
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unsigned int timeout = 60000;
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/* Wait up to 60ms for the character(s) to be sent. */
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do {
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status = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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if (--timeout == 0)
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break;
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udelay(1);
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} while ((status & AR933X_UART_DATA_TX_CSR) == 0);
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}
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static void ar933x_uart_console_putchar(struct uart_port *port, int ch)
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{
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struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
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ar933x_uart_wait_xmitr(up);
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ar933x_uart_putc(up, ch);
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}
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static void ar933x_uart_console_write(struct console *co, const char *s,
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unsigned int count)
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{
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struct ar933x_uart_port *up = ar933x_console_ports[co->index];
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unsigned long flags;
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unsigned int int_en;
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int locked = 1;
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local_irq_save(flags);
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if (up->port.sysrq)
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locked = 0;
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else if (oops_in_progress)
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locked = spin_trylock(&up->port.lock);
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else
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spin_lock(&up->port.lock);
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/*
|
|
* First save the IER then disable the interrupts
|
|
*/
|
|
int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
|
|
ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0);
|
|
|
|
uart_console_write(&up->port, s, count, ar933x_uart_console_putchar);
|
|
|
|
/*
|
|
* Finally, wait for transmitter to become empty
|
|
* and restore the IER
|
|
*/
|
|
ar933x_uart_wait_xmitr(up);
|
|
ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en);
|
|
|
|
ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS);
|
|
|
|
if (locked)
|
|
spin_unlock(&up->port.lock);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int ar933x_uart_console_setup(struct console *co, char *options)
|
|
{
|
|
struct ar933x_uart_port *up;
|
|
int baud = 115200;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS)
|
|
return -EINVAL;
|
|
|
|
up = ar933x_console_ports[co->index];
|
|
if (!up)
|
|
return -ENODEV;
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
return uart_set_options(&up->port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct console ar933x_uart_console = {
|
|
.name = "ttyATH",
|
|
.write = ar933x_uart_console_write,
|
|
.device = uart_console_device,
|
|
.setup = ar933x_uart_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &ar933x_uart_driver,
|
|
};
|
|
|
|
static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
|
|
{
|
|
ar933x_console_ports[up->port.line] = up;
|
|
}
|
|
|
|
#define AR933X_SERIAL_CONSOLE (&ar933x_uart_console)
|
|
|
|
#else
|
|
|
|
static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {}
|
|
|
|
#define AR933X_SERIAL_CONSOLE NULL
|
|
|
|
#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
|
|
|
|
static struct uart_driver ar933x_uart_driver = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = DRIVER_NAME,
|
|
.dev_name = "ttyATH",
|
|
.nr = CONFIG_SERIAL_AR933X_NR_UARTS,
|
|
.cons = AR933X_SERIAL_CONSOLE,
|
|
};
|
|
|
|
static int __devinit ar933x_uart_probe(struct platform_device *pdev)
|
|
{
|
|
struct ar933x_uart_platform_data *pdata;
|
|
struct ar933x_uart_port *up;
|
|
struct uart_port *port;
|
|
struct resource *mem_res;
|
|
struct resource *irq_res;
|
|
int id;
|
|
int ret;
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
id = pdev->id;
|
|
if (id == -1)
|
|
id = 0;
|
|
|
|
if (id > CONFIG_SERIAL_AR933X_NR_UARTS)
|
|
return -EINVAL;
|
|
|
|
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!mem_res) {
|
|
dev_err(&pdev->dev, "no MEM resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!irq_res) {
|
|
dev_err(&pdev->dev, "no IRQ resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL);
|
|
if (!up)
|
|
return -ENOMEM;
|
|
|
|
port = &up->port;
|
|
port->mapbase = mem_res->start;
|
|
|
|
port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE);
|
|
if (!port->membase) {
|
|
ret = -ENOMEM;
|
|
goto err_free_up;
|
|
}
|
|
|
|
port->line = id;
|
|
port->irq = irq_res->start;
|
|
port->dev = &pdev->dev;
|
|
port->type = PORT_AR933X;
|
|
port->iotype = UPIO_MEM32;
|
|
port->uartclk = pdata->uartclk;
|
|
|
|
port->regshift = 2;
|
|
port->fifosize = AR933X_UART_FIFO_SIZE;
|
|
port->ops = &ar933x_uart_ops;
|
|
|
|
ar933x_uart_add_console_port(up);
|
|
|
|
ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
|
|
if (ret)
|
|
goto err_unmap;
|
|
|
|
platform_set_drvdata(pdev, up);
|
|
return 0;
|
|
|
|
err_unmap:
|
|
iounmap(up->port.membase);
|
|
err_free_up:
|
|
kfree(up);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ar933x_uart_remove(struct platform_device *pdev)
|
|
{
|
|
struct ar933x_uart_port *up;
|
|
|
|
up = platform_get_drvdata(pdev);
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
if (up) {
|
|
uart_remove_one_port(&ar933x_uart_driver, &up->port);
|
|
iounmap(up->port.membase);
|
|
kfree(up);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ar933x_uart_platform_driver = {
|
|
.probe = ar933x_uart_probe,
|
|
.remove = __devexit_p(ar933x_uart_remove),
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init ar933x_uart_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS;
|
|
ret = uart_register_driver(&ar933x_uart_driver);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = platform_driver_register(&ar933x_uart_platform_driver);
|
|
if (ret)
|
|
goto err_unregister_uart_driver;
|
|
|
|
return 0;
|
|
|
|
err_unregister_uart_driver:
|
|
uart_unregister_driver(&ar933x_uart_driver);
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ar933x_uart_exit(void)
|
|
{
|
|
platform_driver_unregister(&ar933x_uart_platform_driver);
|
|
uart_unregister_driver(&ar933x_uart_driver);
|
|
}
|
|
|
|
module_init(ar933x_uart_init);
|
|
module_exit(ar933x_uart_exit);
|
|
|
|
MODULE_DESCRIPTION("Atheros AR933X UART driver");
|
|
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|