1 /* 2 * Driver for 8250/16550-type serial ports 3 * 4 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 5 * 6 * Copyright (C) 2001 Russell King. 7 * 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. 12 */ 13 14 #include <linux/serial_8250.h> 15 #include <linux/serial_reg.h> 16 #include <linux/dmaengine.h> 17 18 struct uart_8250_dma { 19 int (*tx_dma)(struct uart_8250_port *p); 20 int (*rx_dma)(struct uart_8250_port *p, unsigned int iir); 21 22 /* Filter function */ 23 dma_filter_fn fn; 24 /* Parameter to the filter function */ 25 void *rx_param; 26 void *tx_param; 27 28 struct dma_slave_config rxconf; 29 struct dma_slave_config txconf; 30 31 struct dma_chan *rxchan; 32 struct dma_chan *txchan; 33 34 dma_addr_t rx_addr; 35 dma_addr_t tx_addr; 36 37 dma_cookie_t rx_cookie; 38 dma_cookie_t tx_cookie; 39 40 void *rx_buf; 41 42 size_t rx_size; 43 size_t tx_size; 44 45 unsigned char tx_running; 46 unsigned char tx_err; 47 unsigned char rx_running; 48 }; 49 50 struct old_serial_port { 51 unsigned int uart; 52 unsigned int baud_base; 53 unsigned int port; 54 unsigned int irq; 55 upf_t flags; 56 unsigned char hub6; 57 unsigned char io_type; 58 unsigned char __iomem *iomem_base; 59 unsigned short iomem_reg_shift; 60 unsigned long irqflags; 61 }; 62 63 struct serial8250_config { 64 const char *name; 65 unsigned short fifo_size; 66 unsigned short tx_loadsz; 67 unsigned char fcr; 68 unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE]; 69 unsigned int flags; 70 }; 71 72 #define UART_CAP_FIFO (1 << 8) /* UART has FIFO */ 73 #define UART_CAP_EFR (1 << 9) /* UART has EFR */ 74 #define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */ 75 #define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */ 76 #define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */ 77 #define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */ 78 #define UART_CAP_HFIFO (1 << 14) /* UART has a "hidden" FIFO */ 79 #define UART_CAP_RPM (1 << 15) /* Runtime PM is active while idle */ 80 81 #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ 82 #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ 83 #define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */ 84 #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ 85 #define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */ 86 87 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 88 89 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ 90 #define SERIAL8250_SHARE_IRQS 1 91 #else 92 #define SERIAL8250_SHARE_IRQS 0 93 #endif 94 95 static inline int serial_in(struct uart_8250_port *up, int offset) 96 { 97 return up->port.serial_in(&up->port, offset); 98 } 99 100 static inline void serial_out(struct uart_8250_port *up, int offset, int value) 101 { 102 up->port.serial_out(&up->port, offset, value); 103 } 104 105 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); 106 107 static inline int serial_dl_read(struct uart_8250_port *up) 108 { 109 return up->dl_read(up); 110 } 111 112 static inline void serial_dl_write(struct uart_8250_port *up, int value) 113 { 114 up->dl_write(up, value); 115 } 116 117 struct uart_8250_port *serial8250_get_port(int line); 118 void serial8250_rpm_get(struct uart_8250_port *p); 119 void serial8250_rpm_put(struct uart_8250_port *p); 120 121 #if defined(__alpha__) && !defined(CONFIG_PCI) 122 /* 123 * Digital did something really horribly wrong with the OUT1 and OUT2 124 * lines on at least some ALPHA's. The failure mode is that if either 125 * is cleared, the machine locks up with endless interrupts. 126 */ 127 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1) 128 #else 129 #define ALPHA_KLUDGE_MCR 0 130 #endif 131 132 #ifdef CONFIG_SERIAL_8250_PNP 133 int serial8250_pnp_init(void); 134 void serial8250_pnp_exit(void); 135 #else 136 static inline int serial8250_pnp_init(void) { return 0; } 137 static inline void serial8250_pnp_exit(void) { } 138 #endif 139 140 #ifdef CONFIG_ARCH_OMAP1 141 static inline int is_omap1_8250(struct uart_8250_port *pt) 142 { 143 int res; 144 145 switch (pt->port.mapbase) { 146 case OMAP1_UART1_BASE: 147 case OMAP1_UART2_BASE: 148 case OMAP1_UART3_BASE: 149 res = 1; 150 break; 151 default: 152 res = 0; 153 break; 154 } 155 156 return res; 157 } 158 159 static inline int is_omap1510_8250(struct uart_8250_port *pt) 160 { 161 if (!cpu_is_omap1510()) 162 return 0; 163 164 return is_omap1_8250(pt); 165 } 166 #else 167 static inline int is_omap1_8250(struct uart_8250_port *pt) 168 { 169 return 0; 170 } 171 static inline int is_omap1510_8250(struct uart_8250_port *pt) 172 { 173 return 0; 174 } 175 #endif 176 177 #ifdef CONFIG_SERIAL_8250_DMA 178 extern int serial8250_tx_dma(struct uart_8250_port *); 179 extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir); 180 extern int serial8250_request_dma(struct uart_8250_port *); 181 extern void serial8250_release_dma(struct uart_8250_port *); 182 #else 183 static inline int serial8250_tx_dma(struct uart_8250_port *p) 184 { 185 return -1; 186 } 187 static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir) 188 { 189 return -1; 190 } 191 static inline int serial8250_request_dma(struct uart_8250_port *p) 192 { 193 return -1; 194 } 195 static inline void serial8250_release_dma(struct uart_8250_port *p) { } 196 #endif 197 198 static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) 199 { 200 unsigned char status; 201 202 status = serial_in(up, 0x04); /* EXCR2 */ 203 #define PRESL(x) ((x) & 0x30) 204 if (PRESL(status) == 0x10) { 205 /* already in high speed mode */ 206 return 0; 207 } else { 208 status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ 209 status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ 210 serial_out(up, 0x04, status); 211 } 212 return 1; 213 } 214 215 static inline int serial_index(struct uart_port *port) 216 { 217 return port->minor - 64; 218 } 219 220 #if 0 221 #define DEBUG_INTR(fmt...) printk(fmt) 222 #else 223 #define DEBUG_INTR(fmt...) do { } while (0) 224 #endif 225