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 AMBA serial ports |
| 3 | * |
| 4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 5 | * |
| 6 | * Copyright 1999 ARM Limited |
| 7 | * Copyright (C) 2000 Deep Blue Solutions Ltd. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | * This is a generic driver for ARM AMBA-type serial ports. They |
| 24 | * have a lot of 16550-like features, but are not register compatible. |
| 25 | * Note that although they do have CTS, DCD and DSR inputs, they do |
| 26 | * not have an RI input, nor do they have DTR or RTS outputs. If |
| 27 | * required, these have to be supplied via some other means (eg, GPIO) |
| 28 | * and hooked into this driver. |
| 29 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | #if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 32 | #define SUPPORT_SYSRQ |
| 33 | #endif |
| 34 | |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/ioport.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/console.h> |
| 39 | #include <linux/sysrq.h> |
| 40 | #include <linux/device.h> |
| 41 | #include <linux/tty.h> |
| 42 | #include <linux/tty_flip.h> |
| 43 | #include <linux/serial_core.h> |
| 44 | #include <linux/serial.h> |
Russell King | a62c80e | 2006-01-07 13:52:45 +0000 | [diff] [blame] | 45 | #include <linux/amba/bus.h> |
| 46 | #include <linux/amba/serial.h> |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 47 | #include <linux/clk.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 48 | #include <linux/slab.h> |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 49 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Lennert Buytenhek | 4faf4e0 | 2006-06-20 19:24:07 +0100 | [diff] [blame] | 51 | #define UART_NR 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | #define SERIAL_AMBA_MAJOR 204 |
| 54 | #define SERIAL_AMBA_MINOR 16 |
| 55 | #define SERIAL_AMBA_NR UART_NR |
| 56 | |
| 57 | #define AMBA_ISR_PASS_LIMIT 256 |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0) |
| 60 | #define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 62 | #define UART_DUMMY_RSR_RX 256 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #define UART_PORT_SIZE 64 |
| 64 | |
| 65 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * We wrap our port structure around the generic uart_port. |
| 67 | */ |
| 68 | struct uart_amba_port { |
| 69 | struct uart_port port; |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 70 | struct clk *clk; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 71 | struct amba_device *dev; |
| 72 | struct amba_pl010_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | unsigned int old_status; |
| 74 | }; |
| 75 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 76 | static void pl010_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 78 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | unsigned int cr; |
| 80 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 81 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | cr &= ~UART010_CR_TIE; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 83 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 86 | static void pl010_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 88 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | unsigned int cr; |
| 90 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 91 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | cr |= UART010_CR_TIE; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 93 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | static void pl010_stop_rx(struct uart_port *port) |
| 97 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 98 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | unsigned int cr; |
| 100 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 101 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | cr &= ~(UART010_CR_RIE | UART010_CR_RTIE); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 103 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | static void pl010_enable_ms(struct uart_port *port) |
| 107 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 108 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | unsigned int cr; |
| 110 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 111 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | cr |= UART010_CR_MSIE; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 113 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 116 | static void pl010_rx_chars(struct uart_amba_port *uap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | unsigned int status, ch, flag, rsr, max_count = 256; |
| 119 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 120 | status = readb(uap->port.membase + UART01x_FR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | while (UART_RX_DATA(status) && max_count--) { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 122 | ch = readb(uap->port.membase + UART01x_DR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | flag = TTY_NORMAL; |
| 124 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 125 | uap->port.icount.rx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | /* |
| 128 | * Note that the error handling code is |
| 129 | * out of the main execution path |
| 130 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 131 | rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX; |
Russell King | 4584928 | 2005-04-26 15:29:44 +0100 | [diff] [blame] | 132 | if (unlikely(rsr & UART01x_RSR_ANY)) { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 133 | writel(0, uap->port.membase + UART01x_ECR); |
Lennert Buytenhek | a4ed06a | 2006-12-06 20:39:57 -0800 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | if (rsr & UART01x_RSR_BE) { |
| 136 | rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 137 | uap->port.icount.brk++; |
| 138 | if (uart_handle_break(&uap->port)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | goto ignore_char; |
| 140 | } else if (rsr & UART01x_RSR_PE) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 141 | uap->port.icount.parity++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | else if (rsr & UART01x_RSR_FE) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 143 | uap->port.icount.frame++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | if (rsr & UART01x_RSR_OE) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 145 | uap->port.icount.overrun++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 147 | rsr &= uap->port.read_status_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
| 149 | if (rsr & UART01x_RSR_BE) |
| 150 | flag = TTY_BREAK; |
| 151 | else if (rsr & UART01x_RSR_PE) |
| 152 | flag = TTY_PARITY; |
| 153 | else if (rsr & UART01x_RSR_FE) |
| 154 | flag = TTY_FRAME; |
| 155 | } |
| 156 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 157 | if (uart_handle_sysrq_char(&uap->port, ch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | goto ignore_char; |
| 159 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 160 | uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag); |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | ignore_char: |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 163 | status = readb(uap->port.membase + UART01x_FR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
Russell King | db002b8 | 2007-06-05 19:39:49 +0100 | [diff] [blame] | 165 | spin_unlock(&uap->port.lock); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 166 | tty_flip_buffer_push(&uap->port.state->port); |
Russell King | db002b8 | 2007-06-05 19:39:49 +0100 | [diff] [blame] | 167 | spin_lock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 170 | static void pl010_tx_chars(struct uart_amba_port *uap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 172 | struct circ_buf *xmit = &uap->port.state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | int count; |
| 174 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 175 | if (uap->port.x_char) { |
| 176 | writel(uap->port.x_char, uap->port.membase + UART01x_DR); |
| 177 | uap->port.icount.tx++; |
| 178 | uap->port.x_char = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return; |
| 180 | } |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 181 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) { |
| 182 | pl010_stop_tx(&uap->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | return; |
| 184 | } |
| 185 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 186 | count = uap->port.fifosize >> 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | do { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 188 | writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 190 | uap->port.icount.tx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (uart_circ_empty(xmit)) |
| 192 | break; |
| 193 | } while (--count > 0); |
| 194 | |
| 195 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 196 | uart_write_wakeup(&uap->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | if (uart_circ_empty(xmit)) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 199 | pl010_stop_tx(&uap->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | } |
| 201 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 202 | static void pl010_modem_status(struct uart_amba_port *uap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | unsigned int status, delta; |
| 205 | |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 206 | writel(0, uap->port.membase + UART010_ICR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 208 | status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
| 210 | delta = status ^ uap->old_status; |
| 211 | uap->old_status = status; |
| 212 | |
| 213 | if (!delta) |
| 214 | return; |
| 215 | |
| 216 | if (delta & UART01x_FR_DCD) |
| 217 | uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD); |
| 218 | |
| 219 | if (delta & UART01x_FR_DSR) |
| 220 | uap->port.icount.dsr++; |
| 221 | |
| 222 | if (delta & UART01x_FR_CTS) |
| 223 | uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS); |
| 224 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 225 | wake_up_interruptible(&uap->port.state->port.delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 228 | static irqreturn_t pl010_int(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 230 | struct uart_amba_port *uap = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; |
| 232 | int handled = 0; |
| 233 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 234 | spin_lock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 236 | status = readb(uap->port.membase + UART010_IIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | if (status) { |
| 238 | do { |
| 239 | if (status & (UART010_IIR_RTIS | UART010_IIR_RIS)) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 240 | pl010_rx_chars(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (status & UART010_IIR_MIS) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 242 | pl010_modem_status(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | if (status & UART010_IIR_TIS) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 244 | pl010_tx_chars(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | if (pass_counter-- == 0) |
| 247 | break; |
| 248 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 249 | status = readb(uap->port.membase + UART010_IIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS | |
| 251 | UART010_IIR_TIS)); |
| 252 | handled = 1; |
| 253 | } |
| 254 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 255 | spin_unlock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
| 257 | return IRQ_RETVAL(handled); |
| 258 | } |
| 259 | |
| 260 | static unsigned int pl010_tx_empty(struct uart_port *port) |
| 261 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 262 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
| 263 | unsigned int status = readb(uap->port.membase + UART01x_FR); |
| 264 | return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | static unsigned int pl010_get_mctrl(struct uart_port *port) |
| 268 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 269 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | unsigned int result = 0; |
| 271 | unsigned int status; |
| 272 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 273 | status = readb(uap->port.membase + UART01x_FR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | if (status & UART01x_FR_DCD) |
| 275 | result |= TIOCM_CAR; |
| 276 | if (status & UART01x_FR_DSR) |
| 277 | result |= TIOCM_DSR; |
| 278 | if (status & UART01x_FR_CTS) |
| 279 | result |= TIOCM_CTS; |
| 280 | |
| 281 | return result; |
| 282 | } |
| 283 | |
| 284 | static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 285 | { |
| 286 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 288 | if (uap->data) |
| 289 | uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | static void pl010_break_ctl(struct uart_port *port, int break_state) |
| 293 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 294 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | unsigned long flags; |
| 296 | unsigned int lcr_h; |
| 297 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 298 | spin_lock_irqsave(&uap->port.lock, flags); |
| 299 | lcr_h = readb(uap->port.membase + UART010_LCRH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | if (break_state == -1) |
| 301 | lcr_h |= UART01x_LCRH_BRK; |
| 302 | else |
| 303 | lcr_h &= ~UART01x_LCRH_BRK; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 304 | writel(lcr_h, uap->port.membase + UART010_LCRH); |
| 305 | spin_unlock_irqrestore(&uap->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | static int pl010_startup(struct uart_port *port) |
| 309 | { |
| 310 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
| 311 | int retval; |
| 312 | |
| 313 | /* |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 314 | * Try to enable the clock producer. |
| 315 | */ |
Julia Lawall | 1c4c439 | 2012-08-26 18:01:01 +0200 | [diff] [blame] | 316 | retval = clk_prepare_enable(uap->clk); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 317 | if (retval) |
Julia Lawall | 1c4c439 | 2012-08-26 18:01:01 +0200 | [diff] [blame] | 318 | goto out; |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 319 | |
| 320 | uap->port.uartclk = clk_get_rate(uap->clk); |
| 321 | |
| 322 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | * Allocate the IRQ |
| 324 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 325 | retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | if (retval) |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 327 | goto clk_dis; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
| 329 | /* |
| 330 | * initialise the old status of the modem signals |
| 331 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 332 | uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | /* |
| 335 | * Finally, enable interrupts |
| 336 | */ |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 337 | writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE, |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 338 | uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | return 0; |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 341 | |
| 342 | clk_dis: |
Julia Lawall | 1c4c439 | 2012-08-26 18:01:01 +0200 | [diff] [blame] | 343 | clk_disable_unprepare(uap->clk); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 344 | out: |
| 345 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | static void pl010_shutdown(struct uart_port *port) |
| 349 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 350 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* |
| 353 | * Free the interrupt |
| 354 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 355 | free_irq(uap->port.irq, uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | /* |
| 358 | * disable all interrupts, disable the port |
| 359 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 360 | writel(0, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | /* disable break condition and fifos */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 363 | writel(readb(uap->port.membase + UART010_LCRH) & |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 364 | ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN), |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 365 | uap->port.membase + UART010_LCRH); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 366 | |
| 367 | /* |
| 368 | * Shut down the clock producer |
| 369 | */ |
Julia Lawall | 1c4c439 | 2012-08-26 18:01:01 +0200 | [diff] [blame] | 370 | clk_disable_unprepare(uap->clk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 374 | pl010_set_termios(struct uart_port *port, struct ktermios *termios, |
| 375 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 377 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | unsigned int lcr_h, old_cr; |
| 379 | unsigned long flags; |
| 380 | unsigned int baud, quot; |
| 381 | |
| 382 | /* |
| 383 | * Ask the core to calculate the divisor for us. |
| 384 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 385 | baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | quot = uart_get_divisor(port, baud); |
| 387 | |
| 388 | switch (termios->c_cflag & CSIZE) { |
| 389 | case CS5: |
| 390 | lcr_h = UART01x_LCRH_WLEN_5; |
| 391 | break; |
| 392 | case CS6: |
| 393 | lcr_h = UART01x_LCRH_WLEN_6; |
| 394 | break; |
| 395 | case CS7: |
| 396 | lcr_h = UART01x_LCRH_WLEN_7; |
| 397 | break; |
| 398 | default: // CS8 |
| 399 | lcr_h = UART01x_LCRH_WLEN_8; |
| 400 | break; |
| 401 | } |
| 402 | if (termios->c_cflag & CSTOPB) |
| 403 | lcr_h |= UART01x_LCRH_STP2; |
| 404 | if (termios->c_cflag & PARENB) { |
| 405 | lcr_h |= UART01x_LCRH_PEN; |
| 406 | if (!(termios->c_cflag & PARODD)) |
| 407 | lcr_h |= UART01x_LCRH_EPS; |
| 408 | } |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 409 | if (uap->port.fifosize > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | lcr_h |= UART01x_LCRH_FEN; |
| 411 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 412 | spin_lock_irqsave(&uap->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
| 414 | /* |
| 415 | * Update the per-port timeout. |
| 416 | */ |
| 417 | uart_update_timeout(port, termios->c_cflag, baud); |
| 418 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 419 | uap->port.read_status_mask = UART01x_RSR_OE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | if (termios->c_iflag & INPCK) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 421 | uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; |
Peter Hurley | ef8b9dd | 2014-06-16 08:10:41 -0400 | [diff] [blame] | 422 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 423 | uap->port.read_status_mask |= UART01x_RSR_BE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | /* |
| 426 | * Characters to ignore |
| 427 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 428 | uap->port.ignore_status_mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (termios->c_iflag & IGNPAR) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 430 | uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | if (termios->c_iflag & IGNBRK) { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 432 | uap->port.ignore_status_mask |= UART01x_RSR_BE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | /* |
| 434 | * If we're ignoring parity and break indicators, |
| 435 | * ignore overruns too (for real raw support). |
| 436 | */ |
| 437 | if (termios->c_iflag & IGNPAR) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 438 | uap->port.ignore_status_mask |= UART01x_RSR_OE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Ignore all characters if CREAD is not set. |
| 443 | */ |
| 444 | if ((termios->c_cflag & CREAD) == 0) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 445 | uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | /* first, disable everything */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 448 | old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | if (UART_ENABLE_MS(port, termios->c_cflag)) |
| 451 | old_cr |= UART010_CR_MSIE; |
| 452 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 453 | writel(0, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | /* Set baud rate */ |
| 456 | quot -= 1; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 457 | writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM); |
| 458 | writel(quot & 0xff, uap->port.membase + UART010_LCRL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | /* |
| 461 | * ----------v----------v----------v----------v----- |
| 462 | * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L |
| 463 | * ----------^----------^----------^----------^----- |
| 464 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 465 | writel(lcr_h, uap->port.membase + UART010_LCRH); |
| 466 | writel(old_cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 468 | spin_unlock_irqrestore(&uap->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
| 470 | |
Mika Westerberg | 476f771 | 2010-09-04 10:23:23 +0300 | [diff] [blame] | 471 | static void pl010_set_ldisc(struct uart_port *port, int new) |
Rodolfo Giometti | 7ed63d5 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 472 | { |
Mika Westerberg | 476f771 | 2010-09-04 10:23:23 +0300 | [diff] [blame] | 473 | if (new == N_PPS) { |
Rodolfo Giometti | 7ed63d5 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 474 | port->flags |= UPF_HARDPPS_CD; |
| 475 | pl010_enable_ms(port); |
| 476 | } else |
| 477 | port->flags &= ~UPF_HARDPPS_CD; |
| 478 | } |
| 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | static const char *pl010_type(struct uart_port *port) |
| 481 | { |
| 482 | return port->type == PORT_AMBA ? "AMBA" : NULL; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Release the memory region(s) being used by 'port' |
| 487 | */ |
| 488 | static void pl010_release_port(struct uart_port *port) |
| 489 | { |
| 490 | release_mem_region(port->mapbase, UART_PORT_SIZE); |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Request the memory region(s) being used by 'port' |
| 495 | */ |
| 496 | static int pl010_request_port(struct uart_port *port) |
| 497 | { |
| 498 | return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010") |
| 499 | != NULL ? 0 : -EBUSY; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Configure/autoconfigure the port. |
| 504 | */ |
| 505 | static void pl010_config_port(struct uart_port *port, int flags) |
| 506 | { |
| 507 | if (flags & UART_CONFIG_TYPE) { |
| 508 | port->type = PORT_AMBA; |
| 509 | pl010_request_port(port); |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * verify the new serial_struct (for TIOCSSERIAL). |
| 515 | */ |
| 516 | static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 517 | { |
| 518 | int ret = 0; |
| 519 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA) |
| 520 | ret = -EINVAL; |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 521 | if (ser->irq < 0 || ser->irq >= nr_irqs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | ret = -EINVAL; |
| 523 | if (ser->baud_base < 9600) |
| 524 | ret = -EINVAL; |
| 525 | return ret; |
| 526 | } |
| 527 | |
| 528 | static struct uart_ops amba_pl010_pops = { |
| 529 | .tx_empty = pl010_tx_empty, |
| 530 | .set_mctrl = pl010_set_mctrl, |
| 531 | .get_mctrl = pl010_get_mctrl, |
| 532 | .stop_tx = pl010_stop_tx, |
| 533 | .start_tx = pl010_start_tx, |
| 534 | .stop_rx = pl010_stop_rx, |
| 535 | .enable_ms = pl010_enable_ms, |
| 536 | .break_ctl = pl010_break_ctl, |
| 537 | .startup = pl010_startup, |
| 538 | .shutdown = pl010_shutdown, |
| 539 | .set_termios = pl010_set_termios, |
Rodolfo Giometti | 7ed63d5 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 540 | .set_ldisc = pl010_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | .type = pl010_type, |
| 542 | .release_port = pl010_release_port, |
| 543 | .request_port = pl010_request_port, |
| 544 | .config_port = pl010_config_port, |
| 545 | .verify_port = pl010_verify_port, |
| 546 | }; |
| 547 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 548 | static struct uart_amba_port *amba_ports[UART_NR]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE |
| 551 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 552 | static void pl010_console_putchar(struct uart_port *port, int ch) |
| 553 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 554 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 555 | unsigned int status; |
| 556 | |
| 557 | do { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 558 | status = readb(uap->port.membase + UART01x_FR); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 559 | barrier(); |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 560 | } while (!UART_TX_READY(status)); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 561 | writel(ch, uap->port.membase + UART01x_DR); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 562 | } |
| 563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | static void |
| 565 | pl010_console_write(struct console *co, const char *s, unsigned int count) |
| 566 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 567 | struct uart_amba_port *uap = amba_ports[co->index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | unsigned int status, old_cr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 570 | clk_enable(uap->clk); |
| 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | /* |
| 573 | * First save the CR then disable the interrupts |
| 574 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 575 | old_cr = readb(uap->port.membase + UART010_CR); |
| 576 | writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 578 | uart_console_write(&uap->port, s, count, pl010_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | /* |
| 581 | * Finally, wait for transmitter to become empty |
| 582 | * and restore the TCR |
| 583 | */ |
| 584 | do { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 585 | status = readb(uap->port.membase + UART01x_FR); |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 586 | barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } while (status & UART01x_FR_BUSY); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 588 | writel(old_cr, uap->port.membase + UART010_CR); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 589 | |
| 590 | clk_disable(uap->clk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | static void __init |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 594 | pl010_console_get_options(struct uart_amba_port *uap, int *baud, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | int *parity, int *bits) |
| 596 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 597 | if (readb(uap->port.membase + UART010_CR) & UART01x_CR_UARTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | unsigned int lcr_h, quot; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 599 | lcr_h = readb(uap->port.membase + UART010_LCRH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
| 601 | *parity = 'n'; |
| 602 | if (lcr_h & UART01x_LCRH_PEN) { |
| 603 | if (lcr_h & UART01x_LCRH_EPS) |
| 604 | *parity = 'e'; |
| 605 | else |
| 606 | *parity = 'o'; |
| 607 | } |
| 608 | |
| 609 | if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7) |
| 610 | *bits = 7; |
| 611 | else |
| 612 | *bits = 8; |
| 613 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 614 | quot = readb(uap->port.membase + UART010_LCRL) | |
| 615 | readb(uap->port.membase + UART010_LCRM) << 8; |
| 616 | *baud = uap->port.uartclk / (16 * (quot + 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | } |
| 619 | |
| 620 | static int __init pl010_console_setup(struct console *co, char *options) |
| 621 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 622 | struct uart_amba_port *uap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | int baud = 38400; |
| 624 | int bits = 8; |
| 625 | int parity = 'n'; |
| 626 | int flow = 'n'; |
Russell King | 36b8f1e | 2011-09-22 11:35:09 +0100 | [diff] [blame] | 627 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
| 629 | /* |
| 630 | * Check whether an invalid uart number has been specified, and |
| 631 | * if so, search for the first available port that does have |
| 632 | * console support. |
| 633 | */ |
| 634 | if (co->index >= UART_NR) |
| 635 | co->index = 0; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 636 | uap = amba_ports[co->index]; |
| 637 | if (!uap) |
Russell King | d28122a | 2007-01-22 18:59:42 +0000 | [diff] [blame] | 638 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Russell King | 36b8f1e | 2011-09-22 11:35:09 +0100 | [diff] [blame] | 640 | ret = clk_prepare(uap->clk); |
| 641 | if (ret) |
| 642 | return ret; |
| 643 | |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 644 | uap->port.uartclk = clk_get_rate(uap->clk); |
| 645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | if (options) |
| 647 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 648 | else |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 649 | pl010_console_get_options(uap, &baud, &parity, &bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 651 | return uart_set_options(&uap->port, co, baud, parity, bits, flow); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Vincent Sanders | 2d93486 | 2005-09-14 22:36:03 +0100 | [diff] [blame] | 654 | static struct uart_driver amba_reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | static struct console amba_console = { |
| 656 | .name = "ttyAM", |
| 657 | .write = pl010_console_write, |
| 658 | .device = uart_console_device, |
| 659 | .setup = pl010_console_setup, |
| 660 | .flags = CON_PRINTBUFFER, |
| 661 | .index = -1, |
| 662 | .data = &amba_reg, |
| 663 | }; |
| 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | #define AMBA_CONSOLE &amba_console |
| 666 | #else |
| 667 | #define AMBA_CONSOLE NULL |
| 668 | #endif |
| 669 | |
| 670 | static struct uart_driver amba_reg = { |
| 671 | .owner = THIS_MODULE, |
| 672 | .driver_name = "ttyAM", |
| 673 | .dev_name = "ttyAM", |
| 674 | .major = SERIAL_AMBA_MAJOR, |
| 675 | .minor = SERIAL_AMBA_MINOR, |
| 676 | .nr = UART_NR, |
| 677 | .cons = AMBA_CONSOLE, |
| 678 | }; |
| 679 | |
Russell King | aa25afa | 2011-02-19 15:55:00 +0000 | [diff] [blame] | 680 | static int pl010_probe(struct amba_device *dev, const struct amba_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 682 | struct uart_amba_port *uap; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 683 | void __iomem *base; |
| 684 | int i, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 686 | for (i = 0; i < ARRAY_SIZE(amba_ports); i++) |
| 687 | if (amba_ports[i] == NULL) |
| 688 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 690 | if (i == ARRAY_SIZE(amba_ports)) |
| 691 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 693 | uap = devm_kzalloc(&dev->dev, sizeof(struct uart_amba_port), |
| 694 | GFP_KERNEL); |
| 695 | if (!uap) |
| 696 | return -ENOMEM; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 697 | |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 698 | base = devm_ioremap(&dev->dev, dev->res.start, |
| 699 | resource_size(&dev->res)); |
| 700 | if (!base) |
| 701 | return -ENOMEM; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 702 | |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 703 | uap->clk = devm_clk_get(&dev->dev, NULL); |
| 704 | if (IS_ERR(uap->clk)) |
| 705 | return PTR_ERR(uap->clk); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 706 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 707 | uap->port.dev = &dev->dev; |
| 708 | uap->port.mapbase = dev->res.start; |
| 709 | uap->port.membase = base; |
| 710 | uap->port.iotype = UPIO_MEM; |
| 711 | uap->port.irq = dev->irq[0]; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 712 | uap->port.fifosize = 16; |
| 713 | uap->port.ops = &amba_pl010_pops; |
| 714 | uap->port.flags = UPF_BOOT_AUTOCONF; |
| 715 | uap->port.line = i; |
| 716 | uap->dev = dev; |
Jingoo Han | 574de55 | 2013-07-30 17:06:57 +0900 | [diff] [blame] | 717 | uap->data = dev_get_platdata(&dev->dev); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 718 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 719 | amba_ports[i] = uap; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 720 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 721 | amba_set_drvdata(dev, uap); |
| 722 | ret = uart_add_one_port(&amba_reg, &uap->port); |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 723 | if (ret) |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 724 | amba_ports[i] = NULL; |
Tushar Behera | 44acd26 | 2014-06-26 15:35:36 +0530 | [diff] [blame^] | 725 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 726 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | |
| 729 | static int pl010_remove(struct amba_device *dev) |
| 730 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 731 | struct uart_amba_port *uap = amba_get_drvdata(dev); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 732 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 734 | uart_remove_one_port(&amba_reg, &uap->port); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 735 | |
| 736 | for (i = 0; i < ARRAY_SIZE(amba_ports); i++) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 737 | if (amba_ports[i] == uap) |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 738 | amba_ports[i] = NULL; |
| 739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | return 0; |
| 741 | } |
| 742 | |
Ulf Hansson | 9546824 | 2013-12-03 11:04:27 +0100 | [diff] [blame] | 743 | #ifdef CONFIG_PM_SLEEP |
| 744 | static int pl010_suspend(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | { |
Ulf Hansson | 9546824 | 2013-12-03 11:04:27 +0100 | [diff] [blame] | 746 | struct uart_amba_port *uap = dev_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
| 748 | if (uap) |
| 749 | uart_suspend_port(&amba_reg, &uap->port); |
| 750 | |
| 751 | return 0; |
| 752 | } |
| 753 | |
Ulf Hansson | 9546824 | 2013-12-03 11:04:27 +0100 | [diff] [blame] | 754 | static int pl010_resume(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | { |
Ulf Hansson | 9546824 | 2013-12-03 11:04:27 +0100 | [diff] [blame] | 756 | struct uart_amba_port *uap = dev_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | if (uap) |
| 759 | uart_resume_port(&amba_reg, &uap->port); |
| 760 | |
| 761 | return 0; |
| 762 | } |
Ulf Hansson | 9546824 | 2013-12-03 11:04:27 +0100 | [diff] [blame] | 763 | #endif |
| 764 | |
| 765 | static SIMPLE_DEV_PM_OPS(pl010_dev_pm_ops, pl010_suspend, pl010_resume); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Russell King | 2c39c9e | 2010-07-27 08:50:16 +0100 | [diff] [blame] | 767 | static struct amba_id pl010_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | { |
| 769 | .id = 0x00041010, |
| 770 | .mask = 0x000fffff, |
| 771 | }, |
| 772 | { 0, 0 }, |
| 773 | }; |
| 774 | |
Dave Martin | a664a11 | 2011-10-05 15:15:22 +0100 | [diff] [blame] | 775 | MODULE_DEVICE_TABLE(amba, pl010_ids); |
| 776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | static struct amba_driver pl010_driver = { |
| 778 | .drv = { |
| 779 | .name = "uart-pl010", |
Ulf Hansson | 9546824 | 2013-12-03 11:04:27 +0100 | [diff] [blame] | 780 | .pm = &pl010_dev_pm_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | }, |
| 782 | .id_table = pl010_ids, |
| 783 | .probe = pl010_probe, |
| 784 | .remove = pl010_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | }; |
| 786 | |
| 787 | static int __init pl010_init(void) |
| 788 | { |
| 789 | int ret; |
| 790 | |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 791 | printk(KERN_INFO "Serial: AMBA driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
| 793 | ret = uart_register_driver(&amba_reg); |
| 794 | if (ret == 0) { |
| 795 | ret = amba_driver_register(&pl010_driver); |
| 796 | if (ret) |
| 797 | uart_unregister_driver(&amba_reg); |
| 798 | } |
| 799 | return ret; |
| 800 | } |
| 801 | |
| 802 | static void __exit pl010_exit(void) |
| 803 | { |
| 804 | amba_driver_unregister(&pl010_driver); |
| 805 | uart_unregister_driver(&amba_reg); |
| 806 | } |
| 807 | |
| 808 | module_init(pl010_init); |
| 809 | module_exit(pl010_exit); |
| 810 | |
| 811 | MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd"); |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 812 | MODULE_DESCRIPTION("ARM AMBA serial port driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | MODULE_LICENSE("GPL"); |