Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/char/amba.c |
| 3 | * |
| 4 | * Driver for AMBA serial ports |
| 5 | * |
| 6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 7 | * |
| 8 | * Copyright 1999 ARM Limited |
| 9 | * Copyright (C) 2000 Deep Blue Solutions Ltd. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 24 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | * This is a generic driver for ARM AMBA-type serial ports. They |
| 26 | * have a lot of 16550-like features, but are not register compatible. |
| 27 | * Note that although they do have CTS, DCD and DSR inputs, they do |
| 28 | * not have an RI input, nor do they have DTR or RTS outputs. If |
| 29 | * required, these have to be supplied via some other means (eg, GPIO) |
| 30 | * and hooked into this driver. |
| 31 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 34 | #define SUPPORT_SYSRQ |
| 35 | #endif |
| 36 | |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/ioport.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/console.h> |
| 41 | #include <linux/sysrq.h> |
| 42 | #include <linux/device.h> |
| 43 | #include <linux/tty.h> |
| 44 | #include <linux/tty_flip.h> |
| 45 | #include <linux/serial_core.h> |
| 46 | #include <linux/serial.h> |
Russell King | a62c80e | 2006-01-07 13:52:45 +0000 | [diff] [blame] | 47 | #include <linux/amba/bus.h> |
| 48 | #include <linux/amba/serial.h> |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 49 | #include <linux/clk.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 50 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Lennert Buytenhek | 4faf4e0 | 2006-06-20 19:24:07 +0100 | [diff] [blame] | 54 | #define UART_NR 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | #define SERIAL_AMBA_MAJOR 204 |
| 57 | #define SERIAL_AMBA_MINOR 16 |
| 58 | #define SERIAL_AMBA_NR UART_NR |
| 59 | |
| 60 | #define AMBA_ISR_PASS_LIMIT 256 |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0) |
| 63 | #define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 65 | #define UART_DUMMY_RSR_RX 256 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define UART_PORT_SIZE 64 |
| 67 | |
| 68 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * We wrap our port structure around the generic uart_port. |
| 70 | */ |
| 71 | struct uart_amba_port { |
| 72 | struct uart_port port; |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 73 | struct clk *clk; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 74 | struct amba_device *dev; |
| 75 | struct amba_pl010_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | unsigned int old_status; |
| 77 | }; |
| 78 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 79 | static void pl010_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 81 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | unsigned int cr; |
| 83 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 84 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | cr &= ~UART010_CR_TIE; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 86 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 89 | static void pl010_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 91 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | unsigned int cr; |
| 93 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 94 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | cr |= UART010_CR_TIE; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 96 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | static void pl010_stop_rx(struct uart_port *port) |
| 100 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 101 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | unsigned int cr; |
| 103 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 104 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | cr &= ~(UART010_CR_RIE | UART010_CR_RTIE); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 106 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static void pl010_enable_ms(struct uart_port *port) |
| 110 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 111 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | unsigned int cr; |
| 113 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 114 | cr = readb(uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | cr |= UART010_CR_MSIE; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 116 | writel(cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 119 | static void pl010_rx_chars(struct uart_amba_port *uap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 121 | struct tty_struct *tty = uap->port.state->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | unsigned int status, ch, flag, rsr, max_count = 256; |
| 123 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 124 | status = readb(uap->port.membase + UART01x_FR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | while (UART_RX_DATA(status) && max_count--) { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 126 | ch = readb(uap->port.membase + UART01x_DR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | flag = TTY_NORMAL; |
| 128 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 129 | uap->port.icount.rx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | /* |
| 132 | * Note that the error handling code is |
| 133 | * out of the main execution path |
| 134 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 135 | rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX; |
Russell King | 4584928 | 2005-04-26 15:29:44 +0100 | [diff] [blame] | 136 | if (unlikely(rsr & UART01x_RSR_ANY)) { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 137 | writel(0, uap->port.membase + UART01x_ECR); |
Lennert Buytenhek | a4ed06a | 2006-12-06 20:39:57 -0800 | [diff] [blame] | 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (rsr & UART01x_RSR_BE) { |
| 140 | rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 141 | uap->port.icount.brk++; |
| 142 | if (uart_handle_break(&uap->port)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | goto ignore_char; |
| 144 | } else if (rsr & UART01x_RSR_PE) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 145 | uap->port.icount.parity++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | else if (rsr & UART01x_RSR_FE) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 147 | uap->port.icount.frame++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | if (rsr & UART01x_RSR_OE) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 149 | uap->port.icount.overrun++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 151 | rsr &= uap->port.read_status_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | if (rsr & UART01x_RSR_BE) |
| 154 | flag = TTY_BREAK; |
| 155 | else if (rsr & UART01x_RSR_PE) |
| 156 | flag = TTY_PARITY; |
| 157 | else if (rsr & UART01x_RSR_FE) |
| 158 | flag = TTY_FRAME; |
| 159 | } |
| 160 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 161 | if (uart_handle_sysrq_char(&uap->port, ch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | goto ignore_char; |
| 163 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 164 | uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag); |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | ignore_char: |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 167 | status = readb(uap->port.membase + UART01x_FR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
Russell King | db002b8 | 2007-06-05 19:39:49 +0100 | [diff] [blame] | 169 | spin_unlock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | tty_flip_buffer_push(tty); |
Russell King | db002b8 | 2007-06-05 19:39:49 +0100 | [diff] [blame] | 171 | spin_lock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 174 | static void pl010_tx_chars(struct uart_amba_port *uap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 176 | struct circ_buf *xmit = &uap->port.state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | int count; |
| 178 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 179 | if (uap->port.x_char) { |
| 180 | writel(uap->port.x_char, uap->port.membase + UART01x_DR); |
| 181 | uap->port.icount.tx++; |
| 182 | uap->port.x_char = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | return; |
| 184 | } |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 185 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) { |
| 186 | pl010_stop_tx(&uap->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | return; |
| 188 | } |
| 189 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 190 | count = uap->port.fifosize >> 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | do { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 192 | writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 194 | uap->port.icount.tx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (uart_circ_empty(xmit)) |
| 196 | break; |
| 197 | } while (--count > 0); |
| 198 | |
| 199 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 200 | uart_write_wakeup(&uap->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | if (uart_circ_empty(xmit)) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 203 | pl010_stop_tx(&uap->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 206 | static void pl010_modem_status(struct uart_amba_port *uap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | unsigned int status, delta; |
| 209 | |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 210 | writel(0, uap->port.membase + UART010_ICR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 212 | status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | delta = status ^ uap->old_status; |
| 215 | uap->old_status = status; |
| 216 | |
| 217 | if (!delta) |
| 218 | return; |
| 219 | |
| 220 | if (delta & UART01x_FR_DCD) |
| 221 | uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD); |
| 222 | |
| 223 | if (delta & UART01x_FR_DSR) |
| 224 | uap->port.icount.dsr++; |
| 225 | |
| 226 | if (delta & UART01x_FR_CTS) |
| 227 | uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS); |
| 228 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 229 | wake_up_interruptible(&uap->port.state->port.delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 232 | static irqreturn_t pl010_int(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 234 | struct uart_amba_port *uap = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; |
| 236 | int handled = 0; |
| 237 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 238 | spin_lock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 240 | status = readb(uap->port.membase + UART010_IIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (status) { |
| 242 | do { |
| 243 | if (status & (UART010_IIR_RTIS | UART010_IIR_RIS)) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 244 | pl010_rx_chars(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | if (status & UART010_IIR_MIS) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 246 | pl010_modem_status(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | if (status & UART010_IIR_TIS) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 248 | pl010_tx_chars(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | if (pass_counter-- == 0) |
| 251 | break; |
| 252 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 253 | status = readb(uap->port.membase + UART010_IIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS | |
| 255 | UART010_IIR_TIS)); |
| 256 | handled = 1; |
| 257 | } |
| 258 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 259 | spin_unlock(&uap->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
| 261 | return IRQ_RETVAL(handled); |
| 262 | } |
| 263 | |
| 264 | static unsigned int pl010_tx_empty(struct uart_port *port) |
| 265 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 266 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
| 267 | unsigned int status = readb(uap->port.membase + UART01x_FR); |
| 268 | return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | static unsigned int pl010_get_mctrl(struct uart_port *port) |
| 272 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 273 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | unsigned int result = 0; |
| 275 | unsigned int status; |
| 276 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 277 | status = readb(uap->port.membase + UART01x_FR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | if (status & UART01x_FR_DCD) |
| 279 | result |= TIOCM_CAR; |
| 280 | if (status & UART01x_FR_DSR) |
| 281 | result |= TIOCM_DSR; |
| 282 | if (status & UART01x_FR_CTS) |
| 283 | result |= TIOCM_CTS; |
| 284 | |
| 285 | return result; |
| 286 | } |
| 287 | |
| 288 | static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 289 | { |
| 290 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 292 | if (uap->data) |
| 293 | uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | static void pl010_break_ctl(struct uart_port *port, int break_state) |
| 297 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 298 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | unsigned long flags; |
| 300 | unsigned int lcr_h; |
| 301 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 302 | spin_lock_irqsave(&uap->port.lock, flags); |
| 303 | lcr_h = readb(uap->port.membase + UART010_LCRH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | if (break_state == -1) |
| 305 | lcr_h |= UART01x_LCRH_BRK; |
| 306 | else |
| 307 | lcr_h &= ~UART01x_LCRH_BRK; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 308 | writel(lcr_h, uap->port.membase + UART010_LCRH); |
| 309 | spin_unlock_irqrestore(&uap->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | static int pl010_startup(struct uart_port *port) |
| 313 | { |
| 314 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
| 315 | int retval; |
| 316 | |
| 317 | /* |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 318 | * Try to enable the clock producer. |
| 319 | */ |
| 320 | retval = clk_enable(uap->clk); |
| 321 | if (retval) |
| 322 | goto out; |
| 323 | |
| 324 | uap->port.uartclk = clk_get_rate(uap->clk); |
| 325 | |
| 326 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | * Allocate the IRQ |
| 328 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 329 | retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | if (retval) |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 331 | goto clk_dis; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
| 333 | /* |
| 334 | * initialise the old status of the modem signals |
| 335 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 336 | 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] | 337 | |
| 338 | /* |
| 339 | * Finally, enable interrupts |
| 340 | */ |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 341 | writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE, |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 342 | uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | return 0; |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 345 | |
| 346 | clk_dis: |
| 347 | clk_disable(uap->clk); |
| 348 | out: |
| 349 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | static void pl010_shutdown(struct uart_port *port) |
| 353 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 354 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | /* |
| 357 | * Free the interrupt |
| 358 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 359 | free_irq(uap->port.irq, uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | /* |
| 362 | * disable all interrupts, disable the port |
| 363 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 364 | writel(0, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | /* disable break condition and fifos */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 367 | writel(readb(uap->port.membase + UART010_LCRH) & |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 368 | ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN), |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 369 | uap->port.membase + UART010_LCRH); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 370 | |
| 371 | /* |
| 372 | * Shut down the clock producer |
| 373 | */ |
| 374 | clk_disable(uap->clk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 378 | pl010_set_termios(struct uart_port *port, struct ktermios *termios, |
| 379 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 381 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | unsigned int lcr_h, old_cr; |
| 383 | unsigned long flags; |
| 384 | unsigned int baud, quot; |
| 385 | |
| 386 | /* |
| 387 | * Ask the core to calculate the divisor for us. |
| 388 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 389 | 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] | 390 | quot = uart_get_divisor(port, baud); |
| 391 | |
| 392 | switch (termios->c_cflag & CSIZE) { |
| 393 | case CS5: |
| 394 | lcr_h = UART01x_LCRH_WLEN_5; |
| 395 | break; |
| 396 | case CS6: |
| 397 | lcr_h = UART01x_LCRH_WLEN_6; |
| 398 | break; |
| 399 | case CS7: |
| 400 | lcr_h = UART01x_LCRH_WLEN_7; |
| 401 | break; |
| 402 | default: // CS8 |
| 403 | lcr_h = UART01x_LCRH_WLEN_8; |
| 404 | break; |
| 405 | } |
| 406 | if (termios->c_cflag & CSTOPB) |
| 407 | lcr_h |= UART01x_LCRH_STP2; |
| 408 | if (termios->c_cflag & PARENB) { |
| 409 | lcr_h |= UART01x_LCRH_PEN; |
| 410 | if (!(termios->c_cflag & PARODD)) |
| 411 | lcr_h |= UART01x_LCRH_EPS; |
| 412 | } |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 413 | if (uap->port.fifosize > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | lcr_h |= UART01x_LCRH_FEN; |
| 415 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 416 | spin_lock_irqsave(&uap->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | /* |
| 419 | * Update the per-port timeout. |
| 420 | */ |
| 421 | uart_update_timeout(port, termios->c_cflag, baud); |
| 422 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 423 | uap->port.read_status_mask = UART01x_RSR_OE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | if (termios->c_iflag & INPCK) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 425 | uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | if (termios->c_iflag & (BRKINT | PARMRK)) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 427 | uap->port.read_status_mask |= UART01x_RSR_BE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | /* |
| 430 | * Characters to ignore |
| 431 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 432 | uap->port.ignore_status_mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (termios->c_iflag & IGNPAR) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 434 | uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (termios->c_iflag & IGNBRK) { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 436 | uap->port.ignore_status_mask |= UART01x_RSR_BE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | /* |
| 438 | * If we're ignoring parity and break indicators, |
| 439 | * ignore overruns too (for real raw support). |
| 440 | */ |
| 441 | if (termios->c_iflag & IGNPAR) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 442 | uap->port.ignore_status_mask |= UART01x_RSR_OE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Ignore all characters if CREAD is not set. |
| 447 | */ |
| 448 | if ((termios->c_cflag & CREAD) == 0) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 449 | uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | /* first, disable everything */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 452 | old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
| 454 | if (UART_ENABLE_MS(port, termios->c_cflag)) |
| 455 | old_cr |= UART010_CR_MSIE; |
| 456 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 457 | writel(0, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
| 459 | /* Set baud rate */ |
| 460 | quot -= 1; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 461 | writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM); |
| 462 | writel(quot & 0xff, uap->port.membase + UART010_LCRL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | /* |
| 465 | * ----------v----------v----------v----------v----- |
| 466 | * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L |
| 467 | * ----------^----------^----------^----------^----- |
| 468 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 469 | writel(lcr_h, uap->port.membase + UART010_LCRH); |
| 470 | writel(old_cr, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 472 | spin_unlock_irqrestore(&uap->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Mika Westerberg | 476f771 | 2010-09-04 10:23:23 +0300 | [diff] [blame] | 475 | static void pl010_set_ldisc(struct uart_port *port, int new) |
Rodolfo Giometti | 7ed63d5 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 476 | { |
Mika Westerberg | 476f771 | 2010-09-04 10:23:23 +0300 | [diff] [blame] | 477 | if (new == N_PPS) { |
Rodolfo Giometti | 7ed63d5 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 478 | port->flags |= UPF_HARDPPS_CD; |
| 479 | pl010_enable_ms(port); |
| 480 | } else |
| 481 | port->flags &= ~UPF_HARDPPS_CD; |
| 482 | } |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | static const char *pl010_type(struct uart_port *port) |
| 485 | { |
| 486 | return port->type == PORT_AMBA ? "AMBA" : NULL; |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | * Release the memory region(s) being used by 'port' |
| 491 | */ |
| 492 | static void pl010_release_port(struct uart_port *port) |
| 493 | { |
| 494 | release_mem_region(port->mapbase, UART_PORT_SIZE); |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Request the memory region(s) being used by 'port' |
| 499 | */ |
| 500 | static int pl010_request_port(struct uart_port *port) |
| 501 | { |
| 502 | return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010") |
| 503 | != NULL ? 0 : -EBUSY; |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * Configure/autoconfigure the port. |
| 508 | */ |
| 509 | static void pl010_config_port(struct uart_port *port, int flags) |
| 510 | { |
| 511 | if (flags & UART_CONFIG_TYPE) { |
| 512 | port->type = PORT_AMBA; |
| 513 | pl010_request_port(port); |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * verify the new serial_struct (for TIOCSSERIAL). |
| 519 | */ |
| 520 | static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 521 | { |
| 522 | int ret = 0; |
| 523 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA) |
| 524 | ret = -EINVAL; |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 525 | if (ser->irq < 0 || ser->irq >= nr_irqs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | ret = -EINVAL; |
| 527 | if (ser->baud_base < 9600) |
| 528 | ret = -EINVAL; |
| 529 | return ret; |
| 530 | } |
| 531 | |
| 532 | static struct uart_ops amba_pl010_pops = { |
| 533 | .tx_empty = pl010_tx_empty, |
| 534 | .set_mctrl = pl010_set_mctrl, |
| 535 | .get_mctrl = pl010_get_mctrl, |
| 536 | .stop_tx = pl010_stop_tx, |
| 537 | .start_tx = pl010_start_tx, |
| 538 | .stop_rx = pl010_stop_rx, |
| 539 | .enable_ms = pl010_enable_ms, |
| 540 | .break_ctl = pl010_break_ctl, |
| 541 | .startup = pl010_startup, |
| 542 | .shutdown = pl010_shutdown, |
| 543 | .set_termios = pl010_set_termios, |
Rodolfo Giometti | 7ed63d5 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 544 | .set_ldisc = pl010_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | .type = pl010_type, |
| 546 | .release_port = pl010_release_port, |
| 547 | .request_port = pl010_request_port, |
| 548 | .config_port = pl010_config_port, |
| 549 | .verify_port = pl010_verify_port, |
| 550 | }; |
| 551 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 552 | static struct uart_amba_port *amba_ports[UART_NR]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE |
| 555 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 556 | static void pl010_console_putchar(struct uart_port *port, int ch) |
| 557 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 558 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 559 | unsigned int status; |
| 560 | |
| 561 | do { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 562 | status = readb(uap->port.membase + UART01x_FR); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 563 | barrier(); |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 564 | } while (!UART_TX_READY(status)); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 565 | writel(ch, uap->port.membase + UART01x_DR); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 566 | } |
| 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | static void |
| 569 | pl010_console_write(struct console *co, const char *s, unsigned int count) |
| 570 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 571 | struct uart_amba_port *uap = amba_ports[co->index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | unsigned int status, old_cr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 574 | clk_enable(uap->clk); |
| 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | /* |
| 577 | * First save the CR then disable the interrupts |
| 578 | */ |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 579 | old_cr = readb(uap->port.membase + UART010_CR); |
| 580 | writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 582 | uart_console_write(&uap->port, s, count, pl010_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | /* |
| 585 | * Finally, wait for transmitter to become empty |
| 586 | * and restore the TCR |
| 587 | */ |
| 588 | do { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 589 | status = readb(uap->port.membase + UART01x_FR); |
Russell King | 98639a6 | 2006-03-25 21:30:11 +0000 | [diff] [blame] | 590 | barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } while (status & UART01x_FR_BUSY); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 592 | writel(old_cr, uap->port.membase + UART010_CR); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 593 | |
| 594 | clk_disable(uap->clk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | static void __init |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 598 | pl010_console_get_options(struct uart_amba_port *uap, int *baud, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | int *parity, int *bits) |
| 600 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 601 | if (readb(uap->port.membase + UART010_CR) & UART01x_CR_UARTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | unsigned int lcr_h, quot; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 603 | lcr_h = readb(uap->port.membase + UART010_LCRH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | *parity = 'n'; |
| 606 | if (lcr_h & UART01x_LCRH_PEN) { |
| 607 | if (lcr_h & UART01x_LCRH_EPS) |
| 608 | *parity = 'e'; |
| 609 | else |
| 610 | *parity = 'o'; |
| 611 | } |
| 612 | |
| 613 | if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7) |
| 614 | *bits = 7; |
| 615 | else |
| 616 | *bits = 8; |
| 617 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 618 | quot = readb(uap->port.membase + UART010_LCRL) | |
| 619 | readb(uap->port.membase + UART010_LCRM) << 8; |
| 620 | *baud = uap->port.uartclk / (16 * (quot + 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } |
| 622 | } |
| 623 | |
| 624 | static int __init pl010_console_setup(struct console *co, char *options) |
| 625 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 626 | struct uart_amba_port *uap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | int baud = 38400; |
| 628 | int bits = 8; |
| 629 | int parity = 'n'; |
| 630 | int flow = 'n'; |
| 631 | |
| 632 | /* |
| 633 | * Check whether an invalid uart number has been specified, and |
| 634 | * if so, search for the first available port that does have |
| 635 | * console support. |
| 636 | */ |
| 637 | if (co->index >= UART_NR) |
| 638 | co->index = 0; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 639 | uap = amba_ports[co->index]; |
| 640 | if (!uap) |
Russell King | d28122a | 2007-01-22 18:59:42 +0000 | [diff] [blame] | 641 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 643 | uap->port.uartclk = clk_get_rate(uap->clk); |
| 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (options) |
| 646 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 647 | else |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 648 | pl010_console_get_options(uap, &baud, &parity, &bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 650 | return uart_set_options(&uap->port, co, baud, parity, bits, flow); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | |
Vincent Sanders | 2d93486 | 2005-09-14 22:36:03 +0100 | [diff] [blame] | 653 | static struct uart_driver amba_reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | static struct console amba_console = { |
| 655 | .name = "ttyAM", |
| 656 | .write = pl010_console_write, |
| 657 | .device = uart_console_device, |
| 658 | .setup = pl010_console_setup, |
| 659 | .flags = CON_PRINTBUFFER, |
| 660 | .index = -1, |
| 661 | .data = &amba_reg, |
| 662 | }; |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | #define AMBA_CONSOLE &amba_console |
| 665 | #else |
| 666 | #define AMBA_CONSOLE NULL |
| 667 | #endif |
| 668 | |
| 669 | static struct uart_driver amba_reg = { |
| 670 | .owner = THIS_MODULE, |
| 671 | .driver_name = "ttyAM", |
| 672 | .dev_name = "ttyAM", |
| 673 | .major = SERIAL_AMBA_MAJOR, |
| 674 | .minor = SERIAL_AMBA_MINOR, |
| 675 | .nr = UART_NR, |
| 676 | .cons = AMBA_CONSOLE, |
| 677 | }; |
| 678 | |
Russell King | aa25afa | 2011-02-19 15:55:00 +0000 | [diff] [blame] | 679 | 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] | 680 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 681 | struct uart_amba_port *uap; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 682 | void __iomem *base; |
| 683 | int i, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 685 | for (i = 0; i < ARRAY_SIZE(amba_ports); i++) |
| 686 | if (amba_ports[i] == NULL) |
| 687 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 689 | if (i == ARRAY_SIZE(amba_ports)) { |
| 690 | ret = -EBUSY; |
| 691 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | } |
| 693 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 694 | uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL); |
| 695 | if (!uap) { |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 696 | ret = -ENOMEM; |
| 697 | goto out; |
| 698 | } |
| 699 | |
Linus Walleij | dc890c2 | 2009-06-07 23:27:31 +0100 | [diff] [blame] | 700 | base = ioremap(dev->res.start, resource_size(&dev->res)); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 701 | if (!base) { |
| 702 | ret = -ENOMEM; |
| 703 | goto free; |
| 704 | } |
| 705 | |
Russell King | ee569c4 | 2008-11-30 17:38:14 +0000 | [diff] [blame] | 706 | uap->clk = clk_get(&dev->dev, NULL); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 707 | if (IS_ERR(uap->clk)) { |
| 708 | ret = PTR_ERR(uap->clk); |
| 709 | goto unmap; |
| 710 | } |
| 711 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 712 | uap->port.dev = &dev->dev; |
| 713 | uap->port.mapbase = dev->res.start; |
| 714 | uap->port.membase = base; |
| 715 | uap->port.iotype = UPIO_MEM; |
| 716 | uap->port.irq = dev->irq[0]; |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 717 | uap->port.fifosize = 16; |
| 718 | uap->port.ops = &amba_pl010_pops; |
| 719 | uap->port.flags = UPF_BOOT_AUTOCONF; |
| 720 | uap->port.line = i; |
| 721 | uap->dev = dev; |
| 722 | uap->data = dev->dev.platform_data; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 723 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 724 | amba_ports[i] = uap; |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 725 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 726 | amba_set_drvdata(dev, uap); |
| 727 | ret = uart_add_one_port(&amba_reg, &uap->port); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 728 | if (ret) { |
| 729 | amba_set_drvdata(dev, NULL); |
| 730 | amba_ports[i] = NULL; |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 731 | clk_put(uap->clk); |
| 732 | unmap: |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 733 | iounmap(base); |
| 734 | free: |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 735 | kfree(uap); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 736 | } |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 737 | out: |
| 738 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | static int pl010_remove(struct amba_device *dev) |
| 742 | { |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 743 | struct uart_amba_port *uap = amba_get_drvdata(dev); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 744 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | amba_set_drvdata(dev, NULL); |
| 747 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 748 | uart_remove_one_port(&amba_reg, &uap->port); |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 749 | |
| 750 | for (i = 0; i < ARRAY_SIZE(amba_ports); i++) |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 751 | if (amba_ports[i] == uap) |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 752 | amba_ports[i] = NULL; |
| 753 | |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 754 | iounmap(uap->port.membase); |
Russell King | ed519de | 2007-04-22 12:30:41 +0100 | [diff] [blame] | 755 | clk_put(uap->clk); |
Russell King | 1b0646a | 2007-04-22 11:55:59 +0100 | [diff] [blame] | 756 | kfree(uap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | return 0; |
| 758 | } |
| 759 | |
Pavel Machek | 0370aff | 2005-04-16 15:25:35 -0700 | [diff] [blame] | 760 | static int pl010_suspend(struct amba_device *dev, pm_message_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | { |
| 762 | struct uart_amba_port *uap = amba_get_drvdata(dev); |
| 763 | |
| 764 | if (uap) |
| 765 | uart_suspend_port(&amba_reg, &uap->port); |
| 766 | |
| 767 | return 0; |
| 768 | } |
| 769 | |
| 770 | static int pl010_resume(struct amba_device *dev) |
| 771 | { |
| 772 | struct uart_amba_port *uap = amba_get_drvdata(dev); |
| 773 | |
| 774 | if (uap) |
| 775 | uart_resume_port(&amba_reg, &uap->port); |
| 776 | |
| 777 | return 0; |
| 778 | } |
| 779 | |
Russell King | 2c39c9e | 2010-07-27 08:50:16 +0100 | [diff] [blame] | 780 | static struct amba_id pl010_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | { |
| 782 | .id = 0x00041010, |
| 783 | .mask = 0x000fffff, |
| 784 | }, |
| 785 | { 0, 0 }, |
| 786 | }; |
| 787 | |
| 788 | static struct amba_driver pl010_driver = { |
| 789 | .drv = { |
| 790 | .name = "uart-pl010", |
| 791 | }, |
| 792 | .id_table = pl010_ids, |
| 793 | .probe = pl010_probe, |
| 794 | .remove = pl010_remove, |
| 795 | .suspend = pl010_suspend, |
| 796 | .resume = pl010_resume, |
| 797 | }; |
| 798 | |
| 799 | static int __init pl010_init(void) |
| 800 | { |
| 801 | int ret; |
| 802 | |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 803 | printk(KERN_INFO "Serial: AMBA driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
| 805 | ret = uart_register_driver(&amba_reg); |
| 806 | if (ret == 0) { |
| 807 | ret = amba_driver_register(&pl010_driver); |
| 808 | if (ret) |
| 809 | uart_unregister_driver(&amba_reg); |
| 810 | } |
| 811 | return ret; |
| 812 | } |
| 813 | |
| 814 | static void __exit pl010_exit(void) |
| 815 | { |
| 816 | amba_driver_unregister(&pl010_driver); |
| 817 | uart_unregister_driver(&amba_reg); |
| 818 | } |
| 819 | |
| 820 | module_init(pl010_init); |
| 821 | module_exit(pl010_exit); |
| 822 | |
| 823 | MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd"); |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 824 | MODULE_DESCRIPTION("ARM AMBA serial port driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | MODULE_LICENSE("GPL"); |