forked from Minki/linux
77285243a6
We have (or will have) custom DMA callbacks in the omap driver due to the different behaviour in the RX and TX case. To make this work we need a few changes in the IRQ handler to invoke the rx_handler again after the "manual" mode or retry the tx_handler again before falling back to the manual mode. Heikki didn't want to see the extra hacks in the generic / default irq handler and Peter wasn't too happy about an OMAP-only IRQ handler. The way I planned it is to use this extra IRQ routine only in DMA case. If Peter dislike this approach then I hope Heikki doesn't block changes in the default IRQ handler :) Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
201 lines
5.0 KiB
C
201 lines
5.0 KiB
C
/*
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* Driver for 8250/16550-type serial ports
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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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* Copyright (C) 2001 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/serial_8250.h>
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#include <linux/serial_reg.h>
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#include <linux/dmaengine.h>
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struct uart_8250_dma {
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int (*tx_dma)(struct uart_8250_port *p);
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int (*rx_dma)(struct uart_8250_port *p, unsigned int iir);
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/* Filter function */
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dma_filter_fn fn;
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/* Parameter to the filter function */
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void *rx_param;
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void *tx_param;
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struct dma_slave_config rxconf;
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struct dma_slave_config txconf;
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struct dma_chan *rxchan;
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struct dma_chan *txchan;
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dma_addr_t rx_addr;
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dma_addr_t tx_addr;
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dma_cookie_t rx_cookie;
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dma_cookie_t tx_cookie;
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void *rx_buf;
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size_t rx_size;
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size_t tx_size;
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unsigned char tx_running:1;
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unsigned char tx_err: 1;
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unsigned char rx_running:1;
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};
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struct old_serial_port {
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unsigned int uart;
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unsigned int baud_base;
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unsigned int port;
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unsigned int irq;
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unsigned int flags;
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unsigned char hub6;
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unsigned char io_type;
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unsigned char *iomem_base;
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unsigned short iomem_reg_shift;
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unsigned long irqflags;
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};
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struct serial8250_config {
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const char *name;
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unsigned short fifo_size;
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unsigned short tx_loadsz;
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unsigned char fcr;
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unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE];
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unsigned int flags;
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};
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#define UART_CAP_FIFO (1 << 8) /* UART has FIFO */
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#define UART_CAP_EFR (1 << 9) /* UART has EFR */
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#define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */
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#define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */
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#define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */
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#define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */
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#define UART_CAP_HFIFO (1 << 14) /* UART has a "hidden" FIFO */
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#define UART_CAP_RPM (1 << 15) /* Runtime PM is active while idle */
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#define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */
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#define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */
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#define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */
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#define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */
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#define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */
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#define PROBE_RSA (1 << 0)
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#define PROBE_ANY (~0)
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#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
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#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
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#define SERIAL8250_SHARE_IRQS 1
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#else
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#define SERIAL8250_SHARE_IRQS 0
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#endif
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static inline int serial_in(struct uart_8250_port *up, int offset)
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{
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return up->port.serial_in(&up->port, offset);
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}
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static inline void serial_out(struct uart_8250_port *up, int offset, int value)
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{
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up->port.serial_out(&up->port, offset, value);
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}
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void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
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static inline int serial_dl_read(struct uart_8250_port *up)
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{
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return up->dl_read(up);
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}
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static inline void serial_dl_write(struct uart_8250_port *up, int value)
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{
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up->dl_write(up, value);
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}
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struct uart_8250_port *serial8250_get_port(int line);
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void serial8250_rpm_get(struct uart_8250_port *p);
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void serial8250_rpm_put(struct uart_8250_port *p);
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#if defined(__alpha__) && !defined(CONFIG_PCI)
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/*
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* Digital did something really horribly wrong with the OUT1 and OUT2
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* lines on at least some ALPHA's. The failure mode is that if either
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* is cleared, the machine locks up with endless interrupts.
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*/
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#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1)
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#else
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#define ALPHA_KLUDGE_MCR 0
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#endif
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#ifdef CONFIG_SERIAL_8250_PNP
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int serial8250_pnp_init(void);
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void serial8250_pnp_exit(void);
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#else
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static inline int serial8250_pnp_init(void) { return 0; }
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static inline void serial8250_pnp_exit(void) { }
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#endif
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#ifdef CONFIG_ARCH_OMAP1
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static inline int is_omap1_8250(struct uart_8250_port *pt)
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{
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int res;
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switch (pt->port.mapbase) {
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case OMAP1_UART1_BASE:
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case OMAP1_UART2_BASE:
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case OMAP1_UART3_BASE:
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res = 1;
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break;
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default:
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res = 0;
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break;
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}
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return res;
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}
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static inline int is_omap1510_8250(struct uart_8250_port *pt)
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{
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if (!cpu_is_omap1510())
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return 0;
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return is_omap1_8250(pt);
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}
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#else
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static inline int is_omap1_8250(struct uart_8250_port *pt)
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{
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return 0;
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}
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static inline int is_omap1510_8250(struct uart_8250_port *pt)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_SERIAL_8250_DMA
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extern int serial8250_tx_dma(struct uart_8250_port *);
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extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir);
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extern int serial8250_request_dma(struct uart_8250_port *);
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extern void serial8250_release_dma(struct uart_8250_port *);
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#else
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static inline int serial8250_tx_dma(struct uart_8250_port *p)
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{
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return -1;
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}
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static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
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{
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return -1;
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}
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static inline int serial8250_request_dma(struct uart_8250_port *p)
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{
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return -1;
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}
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static inline void serial8250_release_dma(struct uart_8250_port *p) { }
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#endif
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