| 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); |
| 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 io_type; |
| 57 | unsigned char __iomem *iomem_base; |
| 58 | unsigned short iomem_reg_shift; |
| 59 | }; |
| 60 | |
| 61 | struct serial8250_config { |
| 62 | const char *name; |
| 63 | unsigned short fifo_size; |
| 64 | unsigned short tx_loadsz; |
| 65 | unsigned char fcr; |
| 66 | unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE]; |
| 67 | unsigned int flags; |
| 68 | }; |
| 69 | |
| 70 | #define UART_CAP_FIFO (1 << 8) /* UART has FIFO */ |
| 71 | #define UART_CAP_EFR (1 << 9) /* UART has EFR */ |
| 72 | #define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */ |
| 73 | #define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */ |
| 74 | #define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */ |
| 75 | #define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */ |
| 76 | #define UART_CAP_HFIFO (1 << 14) /* UART has a "hidden" FIFO */ |
| 77 | #define UART_CAP_RPM (1 << 15) /* Runtime PM is active while idle */ |
| 78 | |
| 79 | #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ |
| 80 | #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ |
| 81 | #define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */ |
| 82 | #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ |
| 83 | #define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */ |
| 84 | |
| 85 | |
| 86 | #ifdef CONFIG_SERIAL_8250_SHARE_IRQ |
| 87 | #define SERIAL8250_SHARE_IRQS 1 |
| 88 | #else |
| 89 | #define SERIAL8250_SHARE_IRQS 0 |
| 90 | #endif |
| 91 | |
| 92 | #define SERIAL8250_PORT_FLAGS(_base, _irq, _flags) \ |
| 93 | { \ |
| 94 | .iobase = _base, \ |
| 95 | .irq = _irq, \ |
| 96 | .uartclk = 1843200, \ |
| 97 | .iotype = UPIO_PORT, \ |
| 98 | .flags = UPF_BOOT_AUTOCONF | (_flags), \ |
| 99 | } |
| 100 | |
| 101 | #define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0) |
| 102 | |
| 103 | |
| 104 | static inline int serial_in(struct uart_8250_port *up, int offset) |
| 105 | { |
| 106 | return up->port.serial_in(&up->port, offset); |
| 107 | } |
| 108 | |
| 109 | static inline void serial_out(struct uart_8250_port *up, int offset, int value) |
| 110 | { |
| 111 | up->port.serial_out(&up->port, offset, value); |
| 112 | } |
| 113 | |
| 114 | void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); |
| 115 | |
| 116 | static inline int serial_dl_read(struct uart_8250_port *up) |
| 117 | { |
| 118 | return up->dl_read(up); |
| 119 | } |
| 120 | |
| 121 | static inline void serial_dl_write(struct uart_8250_port *up, int value) |
| 122 | { |
| 123 | up->dl_write(up, value); |
| 124 | } |
| 125 | |
| 126 | struct uart_8250_port *serial8250_get_port(int line); |
| 127 | void serial8250_rpm_get(struct uart_8250_port *p); |
| 128 | void serial8250_rpm_put(struct uart_8250_port *p); |
| 129 | int serial8250_em485_init(struct uart_8250_port *p); |
| 130 | void serial8250_em485_destroy(struct uart_8250_port *p); |
| 131 | |
| 132 | static inline void serial8250_out_MCR(struct uart_8250_port *up, int value) |
| 133 | { |
| 134 | serial_out(up, UART_MCR, value); |
| 135 | } |
| 136 | |
| 137 | static inline int serial8250_in_MCR(struct uart_8250_port *up) |
| 138 | { |
| 139 | return serial_in(up, UART_MCR); |
| 140 | } |
| 141 | |
| 142 | #if defined(__alpha__) && !defined(CONFIG_PCI) |
| 143 | /* |
| 144 | * Digital did something really horribly wrong with the OUT1 and OUT2 |
| 145 | * lines on at least some ALPHA's. The failure mode is that if either |
| 146 | * is cleared, the machine locks up with endless interrupts. |
| 147 | */ |
| 148 | #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1) |
| 149 | #else |
| 150 | #define ALPHA_KLUDGE_MCR 0 |
| 151 | #endif |
| 152 | |
| 153 | #ifdef CONFIG_SERIAL_8250_PNP |
| 154 | int serial8250_pnp_init(void); |
| 155 | void serial8250_pnp_exit(void); |
| 156 | #else |
| 157 | static inline int serial8250_pnp_init(void) { return 0; } |
| 158 | static inline void serial8250_pnp_exit(void) { } |
| 159 | #endif |
| 160 | |
| 161 | #ifdef CONFIG_SERIAL_8250_FINTEK |
| 162 | int fintek_8250_probe(struct uart_8250_port *uart); |
| 163 | #else |
| 164 | static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; } |
| 165 | #endif |
| 166 | |
| 167 | #ifdef CONFIG_ARCH_OMAP1 |
| 168 | static inline int is_omap1_8250(struct uart_8250_port *pt) |
| 169 | { |
| 170 | int res; |
| 171 | |
| 172 | switch (pt->port.mapbase) { |
| 173 | case OMAP1_UART1_BASE: |
| 174 | case OMAP1_UART2_BASE: |
| 175 | case OMAP1_UART3_BASE: |
| 176 | res = 1; |
| 177 | break; |
| 178 | default: |
| 179 | res = 0; |
| 180 | break; |
| 181 | } |
| 182 | |
| 183 | return res; |
| 184 | } |
| 185 | |
| 186 | static inline int is_omap1510_8250(struct uart_8250_port *pt) |
| 187 | { |
| 188 | if (!cpu_is_omap1510()) |
| 189 | return 0; |
| 190 | |
| 191 | return is_omap1_8250(pt); |
| 192 | } |
| 193 | #else |
| 194 | static inline int is_omap1_8250(struct uart_8250_port *pt) |
| 195 | { |
| 196 | return 0; |
| 197 | } |
| 198 | static inline int is_omap1510_8250(struct uart_8250_port *pt) |
| 199 | { |
| 200 | return 0; |
| 201 | } |
| 202 | #endif |
| 203 | |
| 204 | #ifdef CONFIG_SERIAL_8250_DMA |
| 205 | extern int serial8250_tx_dma(struct uart_8250_port *); |
| 206 | extern int serial8250_rx_dma(struct uart_8250_port *); |
| 207 | extern void serial8250_rx_dma_flush(struct uart_8250_port *); |
| 208 | extern int serial8250_request_dma(struct uart_8250_port *); |
| 209 | extern void serial8250_release_dma(struct uart_8250_port *); |
| 210 | #else |
| 211 | static inline int serial8250_tx_dma(struct uart_8250_port *p) |
| 212 | { |
| 213 | return -1; |
| 214 | } |
| 215 | static inline int serial8250_rx_dma(struct uart_8250_port *p) |
| 216 | { |
| 217 | return -1; |
| 218 | } |
| 219 | static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { } |
| 220 | static inline int serial8250_request_dma(struct uart_8250_port *p) |
| 221 | { |
| 222 | return -1; |
| 223 | } |
| 224 | static inline void serial8250_release_dma(struct uart_8250_port *p) { } |
| 225 | #endif |
| 226 | |
| 227 | static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) |
| 228 | { |
| 229 | unsigned char status; |
| 230 | |
| 231 | status = serial_in(up, 0x04); /* EXCR2 */ |
| 232 | #define PRESL(x) ((x) & 0x30) |
| 233 | if (PRESL(status) == 0x10) { |
| 234 | /* already in high speed mode */ |
| 235 | return 0; |
| 236 | } else { |
| 237 | status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ |
| 238 | status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ |
| 239 | serial_out(up, 0x04, status); |
| 240 | } |
| 241 | return 1; |
| 242 | } |
| 243 | |
| 244 | static inline int serial_index(struct uart_port *port) |
| 245 | { |
| 246 | return port->minor - 64; |
| 247 | } |