2 * Driver for 8250/16550-type serial ports
4 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
6 * Copyright (C) 2001 Russell King.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/serial_8250.h>
15 #include <linux/dmaengine.h>
17 struct uart_8250_dma {
25 struct dma_slave_config rxconf;
26 struct dma_slave_config txconf;
28 struct dma_chan *rxchan;
29 struct dma_chan *txchan;
34 dma_cookie_t rx_cookie;
35 dma_cookie_t tx_cookie;
42 unsigned char tx_running:1;
45 struct old_serial_port {
47 unsigned int baud_base;
52 unsigned char io_type;
53 unsigned char *iomem_base;
54 unsigned short iomem_reg_shift;
55 unsigned long irqflags;
58 struct serial8250_config {
60 unsigned short fifo_size;
61 unsigned short tx_loadsz;
66 #define UART_CAP_FIFO (1 << 8) /* UART has FIFO */
67 #define UART_CAP_EFR (1 << 9) /* UART has EFR */
68 #define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */
69 #define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */
70 #define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */
71 #define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */
73 #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */
74 #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */
75 #define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */
76 #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */
77 #define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */
79 #define PROBE_RSA (1 << 0)
80 #define PROBE_ANY (~0)
82 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
84 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ
85 #define SERIAL8250_SHARE_IRQS 1
87 #define SERIAL8250_SHARE_IRQS 0
90 static inline int serial_in(struct uart_8250_port *up, int offset)
92 return up->port.serial_in(&up->port, offset);
95 static inline void serial_out(struct uart_8250_port *up, int offset, int value)
97 up->port.serial_out(&up->port, offset, value);
100 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
102 static inline int serial_dl_read(struct uart_8250_port *up)
104 return up->dl_read(up);
107 static inline void serial_dl_write(struct uart_8250_port *up, int value)
109 up->dl_write(up, value);
112 #if defined(__alpha__) && !defined(CONFIG_PCI)
114 * Digital did something really horribly wrong with the OUT1 and OUT2
115 * lines on at least some ALPHA's. The failure mode is that if either
116 * is cleared, the machine locks up with endless interrupts.
118 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1)
119 #elif defined(CONFIG_SBC8560)
121 * WindRiver did something similarly broken on their SBC8560 board. The
122 * UART tristates its IRQ output while OUT2 is clear, but they pulled
123 * the interrupt line _up_ instead of down, so if we register the IRQ
124 * while the UART is in that state, we die in an IRQ storm. */
125 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
127 #define ALPHA_KLUDGE_MCR 0
130 #ifdef CONFIG_SERIAL_8250_PNP
131 int serial8250_pnp_init(void);
132 void serial8250_pnp_exit(void);
134 static inline int serial8250_pnp_init(void) { return 0; }
135 static inline void serial8250_pnp_exit(void) { }
138 #ifdef CONFIG_ARCH_OMAP1
139 static inline int is_omap1_8250(struct uart_8250_port *pt)
143 switch (pt->port.mapbase) {
144 case OMAP1_UART1_BASE:
145 case OMAP1_UART2_BASE:
146 case OMAP1_UART3_BASE:
157 static inline int is_omap1510_8250(struct uart_8250_port *pt)
159 if (!cpu_is_omap1510())
162 return is_omap1_8250(pt);
165 static inline int is_omap1_8250(struct uart_8250_port *pt)
169 static inline int is_omap1510_8250(struct uart_8250_port *pt)
175 #ifdef CONFIG_SERIAL_8250_DMA
176 extern int serial8250_tx_dma(struct uart_8250_port *);
177 extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir);
178 extern int serial8250_request_dma(struct uart_8250_port *);
179 extern void serial8250_release_dma(struct uart_8250_port *);
181 static inline int serial8250_tx_dma(struct uart_8250_port *p)
185 static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
189 static inline int serial8250_request_dma(struct uart_8250_port *p)
193 static inline void serial8250_release_dma(struct uart_8250_port *p) { }