Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
Russell King | bc49a66 | 2005-09-01 15:56:26 +0100 | [diff] [blame] | 14 | #include <linux/serial_8250.h> |
Yoshihiro YUNOMAE | aef9a7b | 2014-07-16 01:19:36 +0000 | [diff] [blame] | 15 | #include <linux/serial_reg.h> |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 16 | #include <linux/dmaengine.h> |
| 17 | |
| 18 | struct uart_8250_dma { |
Sebastian Andrzej Siewior | f1a297b | 2014-09-29 20:06:42 +0200 | [diff] [blame] | 19 | int (*tx_dma)(struct uart_8250_port *p); |
Peter Hurley | 33d9b8b2 | 2016-04-09 22:14:36 -0700 | [diff] [blame] | 20 | int (*rx_dma)(struct uart_8250_port *p); |
Sebastian Andrzej Siewior | f1a297b | 2014-09-29 20:06:42 +0200 | [diff] [blame] | 21 | |
Andy Shevchenko | 9a1870c | 2014-08-19 20:29:22 +0300 | [diff] [blame] | 22 | /* Filter function */ |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 23 | dma_filter_fn fn; |
Andy Shevchenko | 9a1870c | 2014-08-19 20:29:22 +0300 | [diff] [blame] | 24 | /* Parameter to the filter function */ |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 25 | void *rx_param; |
| 26 | void *tx_param; |
| 27 | |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 28 | struct dma_slave_config rxconf; |
| 29 | struct dma_slave_config txconf; |
| 30 | |
| 31 | struct dma_chan *rxchan; |
| 32 | struct dma_chan *txchan; |
| 33 | |
Andy Shevchenko | d1834ba | 2016-08-17 19:20:25 +0300 | [diff] [blame] | 34 | /* Device address base for DMA operations */ |
| 35 | phys_addr_t rx_dma_addr; |
| 36 | phys_addr_t tx_dma_addr; |
| 37 | |
| 38 | /* DMA address of the buffer in memory */ |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 39 | dma_addr_t rx_addr; |
| 40 | dma_addr_t tx_addr; |
| 41 | |
| 42 | dma_cookie_t rx_cookie; |
| 43 | dma_cookie_t tx_cookie; |
| 44 | |
| 45 | void *rx_buf; |
| 46 | |
| 47 | size_t rx_size; |
| 48 | size_t tx_size; |
| 49 | |
John Ogness | eafb9ee | 2015-08-14 18:01:02 +0200 | [diff] [blame] | 50 | unsigned char tx_running; |
| 51 | unsigned char tx_err; |
| 52 | unsigned char rx_running; |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 53 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | struct old_serial_port { |
| 56 | unsigned int uart; |
| 57 | unsigned int baud_base; |
| 58 | unsigned int port; |
| 59 | unsigned int irq; |
Andy Shevchenko | 079119a | 2015-03-11 13:52:53 +0200 | [diff] [blame] | 60 | upf_t flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | unsigned char io_type; |
Sudip Mukherjee | 7f1dc2f | 2014-10-16 14:16:22 +0530 | [diff] [blame] | 62 | unsigned char __iomem *iomem_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | unsigned short iomem_reg_shift; |
| 64 | }; |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | struct serial8250_config { |
| 67 | const char *name; |
| 68 | unsigned short fifo_size; |
| 69 | unsigned short tx_loadsz; |
| 70 | unsigned char fcr; |
Yoshihiro YUNOMAE | aef9a7b | 2014-07-16 01:19:36 +0000 | [diff] [blame] | 71 | unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | unsigned int flags; |
| 73 | }; |
| 74 | |
| 75 | #define UART_CAP_FIFO (1 << 8) /* UART has FIFO */ |
| 76 | #define UART_CAP_EFR (1 << 9) /* UART has EFR */ |
| 77 | #define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */ |
| 78 | #define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */ |
| 79 | #define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */ |
Stephen Warren | 4539c24 | 2011-05-17 16:12:36 -0600 | [diff] [blame] | 80 | #define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */ |
Stephen Hurd | ebebd49 | 2013-01-17 14:14:53 -0800 | [diff] [blame] | 81 | #define UART_CAP_HFIFO (1 << 14) /* UART has a "hidden" FIFO */ |
Sebastian Andrzej Siewior | d74d5d1 | 2014-09-10 21:29:57 +0200 | [diff] [blame] | 82 | #define UART_CAP_RPM (1 << 15) /* Runtime PM is active while idle */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Russell King | 4ba5e35 | 2005-06-23 10:43:04 +0100 | [diff] [blame] | 84 | #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 85 | #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 86 | #define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */ |
Will Newton | 363f66f | 2008-09-02 14:35:44 -0700 | [diff] [blame] | 87 | #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ |
Alan Cox | eb26dfe | 2012-07-12 13:00:31 +0100 | [diff] [blame] | 88 | #define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */ |
Russell King | 4ba5e35 | 2005-06-23 10:43:04 +0100 | [diff] [blame] | 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | #ifdef CONFIG_SERIAL_8250_SHARE_IRQ |
| 92 | #define SERIAL8250_SHARE_IRQS 1 |
| 93 | #else |
| 94 | #define SERIAL8250_SHARE_IRQS 0 |
| 95 | #endif |
| 96 | |
Anton Wuerfel | b3bd666 | 2016-01-14 16:08:24 +0100 | [diff] [blame] | 97 | #define SERIAL8250_PORT_FLAGS(_base, _irq, _flags) \ |
| 98 | { \ |
| 99 | .iobase = _base, \ |
| 100 | .irq = _irq, \ |
| 101 | .uartclk = 1843200, \ |
| 102 | .iotype = UPIO_PORT, \ |
| 103 | .flags = UPF_BOOT_AUTOCONF | (_flags), \ |
| 104 | } |
| 105 | |
| 106 | #define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0) |
| 107 | |
| 108 | |
Paul Gortmaker | 3f0ab32 | 2012-03-08 19:12:09 -0500 | [diff] [blame] | 109 | static inline int serial_in(struct uart_8250_port *up, int offset) |
| 110 | { |
| 111 | return up->port.serial_in(&up->port, offset); |
| 112 | } |
| 113 | |
| 114 | static inline void serial_out(struct uart_8250_port *up, int offset, int value) |
| 115 | { |
| 116 | up->port.serial_out(&up->port, offset, value); |
| 117 | } |
| 118 | |
Sudhakar Mamillapalli | 0ad372b | 2012-04-10 14:10:58 -0700 | [diff] [blame] | 119 | void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); |
| 120 | |
Magnus Damm | cc419fa0 | 2012-05-02 21:46:51 +0900 | [diff] [blame] | 121 | static inline int serial_dl_read(struct uart_8250_port *up) |
| 122 | { |
| 123 | return up->dl_read(up); |
| 124 | } |
| 125 | |
| 126 | static inline void serial_dl_write(struct uart_8250_port *up, int value) |
| 127 | { |
| 128 | up->dl_write(up, value); |
| 129 | } |
| 130 | |
Sebastian Andrzej Siewior | ae14a79 | 2014-09-05 21:02:36 +0200 | [diff] [blame] | 131 | struct uart_8250_port *serial8250_get_port(int line); |
Sebastian Andrzej Siewior | 7728524 | 2014-09-29 20:06:48 +0200 | [diff] [blame] | 132 | void serial8250_rpm_get(struct uart_8250_port *p); |
| 133 | void serial8250_rpm_put(struct uart_8250_port *p); |
Matwey V. Kornilov | e490c91 | 2016-02-01 21:09:21 +0300 | [diff] [blame] | 134 | int serial8250_em485_init(struct uart_8250_port *p); |
| 135 | void serial8250_em485_destroy(struct uart_8250_port *p); |
Sebastian Andrzej Siewior | ae14a79 | 2014-09-05 21:02:36 +0200 | [diff] [blame] | 136 | |
Yegor Yefremov | 36fd95b | 2016-05-31 10:59:15 +0200 | [diff] [blame] | 137 | static inline void serial8250_out_MCR(struct uart_8250_port *up, int value) |
| 138 | { |
| 139 | serial_out(up, UART_MCR, value); |
| 140 | } |
| 141 | |
| 142 | static inline int serial8250_in_MCR(struct uart_8250_port *up) |
| 143 | { |
Andy Shevchenko | 5db4f7f | 2016-08-16 15:06:54 +0300 | [diff] [blame] | 144 | return serial_in(up, UART_MCR); |
Yegor Yefremov | 36fd95b | 2016-05-31 10:59:15 +0200 | [diff] [blame] | 145 | } |
| 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | #if defined(__alpha__) && !defined(CONFIG_PCI) |
| 148 | /* |
| 149 | * Digital did something really horribly wrong with the OUT1 and OUT2 |
| 150 | * lines on at least some ALPHA's. The failure mode is that if either |
| 151 | * is cleared, the machine locks up with endless interrupts. |
| 152 | */ |
| 153 | #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | #else |
| 155 | #define ALPHA_KLUDGE_MCR 0 |
| 156 | #endif |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 157 | |
| 158 | #ifdef CONFIG_SERIAL_8250_PNP |
| 159 | int serial8250_pnp_init(void); |
| 160 | void serial8250_pnp_exit(void); |
| 161 | #else |
| 162 | static inline int serial8250_pnp_init(void) { return 0; } |
| 163 | static inline void serial8250_pnp_exit(void) { } |
| 164 | #endif |
| 165 | |
Ricardo Ribalda Delgado | fa01e2c | 2016-04-27 10:40:10 +0200 | [diff] [blame] | 166 | #ifdef CONFIG_SERIAL_8250_FINTEK |
| 167 | int fintek_8250_probe(struct uart_8250_port *uart); |
| 168 | #else |
| 169 | static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; } |
| 170 | #endif |
| 171 | |
Tony Lindgren | 54ec52b | 2012-10-03 15:31:58 -0700 | [diff] [blame] | 172 | #ifdef CONFIG_ARCH_OMAP1 |
| 173 | static inline int is_omap1_8250(struct uart_8250_port *pt) |
| 174 | { |
| 175 | int res; |
| 176 | |
| 177 | switch (pt->port.mapbase) { |
| 178 | case OMAP1_UART1_BASE: |
| 179 | case OMAP1_UART2_BASE: |
| 180 | case OMAP1_UART3_BASE: |
| 181 | res = 1; |
| 182 | break; |
| 183 | default: |
| 184 | res = 0; |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | return res; |
| 189 | } |
| 190 | |
| 191 | static inline int is_omap1510_8250(struct uart_8250_port *pt) |
| 192 | { |
| 193 | if (!cpu_is_omap1510()) |
| 194 | return 0; |
| 195 | |
| 196 | return is_omap1_8250(pt); |
| 197 | } |
| 198 | #else |
| 199 | static inline int is_omap1_8250(struct uart_8250_port *pt) |
| 200 | { |
| 201 | return 0; |
| 202 | } |
| 203 | static inline int is_omap1510_8250(struct uart_8250_port *pt) |
| 204 | { |
| 205 | return 0; |
| 206 | } |
| 207 | #endif |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 208 | |
| 209 | #ifdef CONFIG_SERIAL_8250_DMA |
| 210 | extern int serial8250_tx_dma(struct uart_8250_port *); |
Peter Hurley | 33d9b8b2 | 2016-04-09 22:14:36 -0700 | [diff] [blame] | 211 | extern int serial8250_rx_dma(struct uart_8250_port *); |
| 212 | extern void serial8250_rx_dma_flush(struct uart_8250_port *); |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 213 | extern int serial8250_request_dma(struct uart_8250_port *); |
| 214 | extern void serial8250_release_dma(struct uart_8250_port *); |
| 215 | #else |
| 216 | static inline int serial8250_tx_dma(struct uart_8250_port *p) |
| 217 | { |
| 218 | return -1; |
| 219 | } |
Peter Hurley | 33d9b8b2 | 2016-04-09 22:14:36 -0700 | [diff] [blame] | 220 | static inline int serial8250_rx_dma(struct uart_8250_port *p) |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 221 | { |
| 222 | return -1; |
| 223 | } |
Peter Hurley | 33d9b8b2 | 2016-04-09 22:14:36 -0700 | [diff] [blame] | 224 | static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { } |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 225 | static inline int serial8250_request_dma(struct uart_8250_port *p) |
| 226 | { |
| 227 | return -1; |
| 228 | } |
| 229 | static inline void serial8250_release_dma(struct uart_8250_port *p) { } |
| 230 | #endif |
Peter Hurley | d81e50f | 2015-02-24 14:25:04 -0500 | [diff] [blame] | 231 | |
| 232 | static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) |
| 233 | { |
| 234 | unsigned char status; |
| 235 | |
| 236 | status = serial_in(up, 0x04); /* EXCR2 */ |
| 237 | #define PRESL(x) ((x) & 0x30) |
| 238 | if (PRESL(status) == 0x10) { |
| 239 | /* already in high speed mode */ |
| 240 | return 0; |
| 241 | } else { |
| 242 | status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ |
| 243 | status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ |
| 244 | serial_out(up, 0x04, status); |
| 245 | } |
| 246 | return 1; |
| 247 | } |
Peter Hurley | b6830f6 | 2015-06-27 09:19:00 -0400 | [diff] [blame] | 248 | |
| 249 | static inline int serial_index(struct uart_port *port) |
| 250 | { |
| 251 | return port->minor - 64; |
| 252 | } |