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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>
200 lines
5 KiB
C
200 lines
5 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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