Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Kleine-König | f890cef | 2015-02-24 11:17:08 +0100 | [diff] [blame] | 2 | * Driver for Motorola/Freescale IMX serial ports |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Uwe Kleine-König | f890cef | 2015-02-24 11:17:08 +0100 | [diff] [blame] | 4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
Uwe Kleine-König | f890cef | 2015-02-24 11:17:08 +0100 | [diff] [blame] | 6 | * Author: Sascha Hauer <sascha@saschahauer.de> |
| 7 | * Copyright (C) 2004 Pengutronix |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 21 | #define SUPPORT_SYSRQ |
| 22 | #endif |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/ioport.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/console.h> |
| 28 | #include <linux/sysrq.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 29 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/tty.h> |
| 31 | #include <linux/tty_flip.h> |
| 32 | #include <linux/serial_core.h> |
| 33 | #include <linux/serial.h> |
Sascha Hauer | 38a41fd | 2008-07-05 10:02:46 +0200 | [diff] [blame] | 34 | #include <linux/clk.h> |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 35 | #include <linux/delay.h> |
Oskar Schirmer | 534fca0 | 2009-06-11 14:52:23 +0100 | [diff] [blame] | 36 | #include <linux/rational.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 38 | #include <linux/of.h> |
| 39 | #include <linux/of_device.h> |
Sachin Kamat | e32a9f8 | 2013-01-07 10:25:03 +0530 | [diff] [blame] | 40 | #include <linux/io.h> |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 41 | #include <linux/dma-mapping.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <asm/irq.h> |
Arnd Bergmann | 82906b1 | 2012-08-24 15:14:29 +0200 | [diff] [blame] | 44 | #include <linux/platform_data/serial-imx.h> |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 45 | #include <linux/platform_data/dma-imx.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 47 | #include "serial_mctrl_gpio.h" |
| 48 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 49 | /* Register definitions */ |
| 50 | #define URXD0 0x0 /* Receiver Register */ |
| 51 | #define URTX0 0x40 /* Transmitter Register */ |
| 52 | #define UCR1 0x80 /* Control Register 1 */ |
| 53 | #define UCR2 0x84 /* Control Register 2 */ |
| 54 | #define UCR3 0x88 /* Control Register 3 */ |
| 55 | #define UCR4 0x8c /* Control Register 4 */ |
| 56 | #define UFCR 0x90 /* FIFO Control Register */ |
| 57 | #define USR1 0x94 /* Status Register 1 */ |
| 58 | #define USR2 0x98 /* Status Register 2 */ |
| 59 | #define UESC 0x9c /* Escape Character Register */ |
| 60 | #define UTIM 0xa0 /* Escape Timer Register */ |
| 61 | #define UBIR 0xa4 /* BRM Incremental Register */ |
| 62 | #define UBMR 0xa8 /* BRM Modulator Register */ |
| 63 | #define UBRC 0xac /* Baud Rate Count Register */ |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 64 | #define IMX21_ONEMS 0xb0 /* One Millisecond register */ |
| 65 | #define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */ |
| 66 | #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 67 | |
| 68 | /* UART Control Register Bit Fields.*/ |
Jiada Wang | 55d8693 | 2014-12-09 18:11:22 +0900 | [diff] [blame] | 69 | #define URXD_DUMMY_READ (1<<16) |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 70 | #define URXD_CHARRDY (1<<15) |
| 71 | #define URXD_ERR (1<<14) |
| 72 | #define URXD_OVRRUN (1<<13) |
| 73 | #define URXD_FRMERR (1<<12) |
| 74 | #define URXD_BRK (1<<11) |
| 75 | #define URXD_PRERR (1<<10) |
Dirk Behme | 26c4741 | 2014-09-03 12:33:53 +0100 | [diff] [blame] | 76 | #define URXD_RX_DATA (0xFF<<0) |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 77 | #define UCR1_ADEN (1<<15) /* Auto detect interrupt */ |
| 78 | #define UCR1_ADBR (1<<14) /* Auto detect baud rate */ |
| 79 | #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */ |
| 80 | #define UCR1_IDEN (1<<12) /* Idle condition interrupt */ |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 81 | #define UCR1_ICD_REG(x) (((x) & 3) << 10) /* idle condition detect */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 82 | #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */ |
| 83 | #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */ |
| 84 | #define UCR1_IREN (1<<7) /* Infrared interface enable */ |
| 85 | #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */ |
| 86 | #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */ |
| 87 | #define UCR1_SNDBRK (1<<4) /* Send break */ |
| 88 | #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */ |
| 89 | #define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */ |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 90 | #define UCR1_ATDMAEN (1<<2) /* Aging DMA Timer Enable */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 91 | #define UCR1_DOZE (1<<1) /* Doze */ |
| 92 | #define UCR1_UARTEN (1<<0) /* UART enabled */ |
| 93 | #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */ |
| 94 | #define UCR2_IRTS (1<<14) /* Ignore RTS pin */ |
| 95 | #define UCR2_CTSC (1<<13) /* CTS pin control */ |
| 96 | #define UCR2_CTS (1<<12) /* Clear to send */ |
| 97 | #define UCR2_ESCEN (1<<11) /* Escape enable */ |
| 98 | #define UCR2_PREN (1<<8) /* Parity enable */ |
| 99 | #define UCR2_PROE (1<<7) /* Parity odd/even */ |
| 100 | #define UCR2_STPB (1<<6) /* Stop */ |
| 101 | #define UCR2_WS (1<<5) /* Word size */ |
| 102 | #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */ |
| 103 | #define UCR2_ATEN (1<<3) /* Aging Timer Enable */ |
| 104 | #define UCR2_TXEN (1<<2) /* Transmitter enabled */ |
| 105 | #define UCR2_RXEN (1<<1) /* Receiver enabled */ |
| 106 | #define UCR2_SRST (1<<0) /* SW reset */ |
| 107 | #define UCR3_DTREN (1<<13) /* DTR interrupt enable */ |
| 108 | #define UCR3_PARERREN (1<<12) /* Parity enable */ |
| 109 | #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */ |
| 110 | #define UCR3_DSR (1<<10) /* Data set ready */ |
| 111 | #define UCR3_DCD (1<<9) /* Data carrier detect */ |
| 112 | #define UCR3_RI (1<<8) /* Ring indicator */ |
Fabio Estevam | b38cb7d | 2014-05-14 15:55:03 -0300 | [diff] [blame] | 113 | #define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 114 | #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */ |
| 115 | #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */ |
| 116 | #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */ |
Uwe Kleine-König | 27e1650 | 2016-03-24 14:24:25 +0100 | [diff] [blame] | 117 | #define UCR3_DTRDEN (1<<3) /* Data Terminal Ready Delta Enable. */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 118 | #define IMX21_UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select */ |
| 119 | #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */ |
| 120 | #define UCR3_BPEN (1<<0) /* Preset registers enable */ |
| 121 | #define UCR4_CTSTL_SHF 10 /* CTS trigger level shift */ |
| 122 | #define UCR4_CTSTL_MASK 0x3F /* CTS trigger is 6 bits wide */ |
| 123 | #define UCR4_INVR (1<<9) /* Inverted infrared reception */ |
| 124 | #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */ |
| 125 | #define UCR4_WKEN (1<<7) /* Wake interrupt enable */ |
| 126 | #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */ |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 127 | #define UCR4_IDDMAEN (1<<6) /* DMA IDLE Condition Detected */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 128 | #define UCR4_IRSC (1<<5) /* IR special case */ |
| 129 | #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */ |
| 130 | #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */ |
| 131 | #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */ |
| 132 | #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */ |
| 133 | #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */ |
| 134 | #define UFCR_DCEDTE (1<<6) /* DCE/DTE mode select */ |
| 135 | #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */ |
| 136 | #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7) |
| 137 | #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */ |
| 138 | #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */ |
| 139 | #define USR1_RTSS (1<<14) /* RTS pin status */ |
| 140 | #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */ |
| 141 | #define USR1_RTSD (1<<12) /* RTS delta */ |
| 142 | #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */ |
| 143 | #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */ |
| 144 | #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */ |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 145 | #define USR1_AGTIM (1<<8) /* Ageing timer interrupt flag */ |
Uwe Kleine-König | 27e1650 | 2016-03-24 14:24:25 +0100 | [diff] [blame] | 146 | #define USR1_DTRD (1<<7) /* DTR Delta */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 147 | #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */ |
| 148 | #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */ |
| 149 | #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */ |
| 150 | #define USR2_ADET (1<<15) /* Auto baud rate detect complete */ |
| 151 | #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ |
| 152 | #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ |
| 153 | #define USR2_IDLE (1<<12) /* Idle condition */ |
Uwe Kleine-König | 90ebc48 | 2015-10-18 21:34:46 +0200 | [diff] [blame] | 154 | #define USR2_RIDELT (1<<10) /* Ring Interrupt Delta */ |
| 155 | #define USR2_RIIN (1<<9) /* Ring Indicator Input */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 156 | #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ |
| 157 | #define USR2_WAKE (1<<7) /* Wake */ |
Uwe Kleine-König | 90ebc48 | 2015-10-18 21:34:46 +0200 | [diff] [blame] | 158 | #define USR2_DCDIN (1<<5) /* Data Carrier Detect Input */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 159 | #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ |
| 160 | #define USR2_TXDC (1<<3) /* Transmitter complete */ |
| 161 | #define USR2_BRCD (1<<2) /* Break condition */ |
| 162 | #define USR2_ORE (1<<1) /* Overrun error */ |
| 163 | #define USR2_RDR (1<<0) /* Recv data ready */ |
| 164 | #define UTS_FRCPERR (1<<13) /* Force parity error */ |
| 165 | #define UTS_LOOP (1<<12) /* Loop tx and rx */ |
| 166 | #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */ |
| 167 | #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */ |
| 168 | #define UTS_TXFULL (1<<4) /* TxFIFO full */ |
| 169 | #define UTS_RXFULL (1<<3) /* RxFIFO full */ |
| 170 | #define UTS_SOFTRST (1<<0) /* Software reset */ |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | /* We've been assigned a range on the "Low-density serial ports" major */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 173 | #define SERIAL_IMX_MAJOR 207 |
| 174 | #define MINOR_START 16 |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 175 | #define DEV_NAME "ttymxc" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | * This determines how often we check the modem status signals |
| 179 | * for any change. They generally aren't connected to an IRQ |
| 180 | * so we have to poll them. We also check immediately before |
| 181 | * filling the TX fifo incase CTS has been dropped. |
| 182 | */ |
| 183 | #define MCTRL_TIMEOUT (250*HZ/1000) |
| 184 | |
| 185 | #define DRIVER_NAME "IMX-uart" |
| 186 | |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 187 | #define UART_NR 8 |
| 188 | |
Uwe Kleine-König | f95661b | 2015-02-24 11:17:09 +0100 | [diff] [blame] | 189 | /* i.MX21 type uart runs on all i.mx except i.MX1 and i.MX6q */ |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 190 | enum imx_uart_type { |
| 191 | IMX1_UART, |
| 192 | IMX21_UART, |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 193 | IMX6Q_UART, |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 194 | }; |
| 195 | |
| 196 | /* device type dependent stuff */ |
| 197 | struct imx_uart_data { |
| 198 | unsigned uts_reg; |
| 199 | enum imx_uart_type devtype; |
| 200 | }; |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | struct imx_port { |
| 203 | struct uart_port port; |
| 204 | struct timer_list timer; |
| 205 | unsigned int old_status; |
Daniel Glöckner | 26bbb3f | 2009-06-11 14:36:29 +0100 | [diff] [blame] | 206 | unsigned int have_rtscts:1; |
Huang Shijie | 20ff2fe | 2013-05-30 14:07:12 +0800 | [diff] [blame] | 207 | unsigned int dte_mode:1; |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 208 | unsigned int irda_inv_rx:1; |
| 209 | unsigned int irda_inv_tx:1; |
| 210 | unsigned short trcv_delay; /* transceiver delay */ |
Sascha Hauer | 3a9465f | 2012-03-07 09:31:43 +0100 | [diff] [blame] | 211 | struct clk *clk_ipg; |
| 212 | struct clk *clk_per; |
Uwe Kleine-König | 7d0b066 | 2012-05-21 21:57:39 +0200 | [diff] [blame] | 213 | const struct imx_uart_data *devdata; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 214 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 215 | struct mctrl_gpios *gpios; |
| 216 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 217 | /* DMA fields */ |
| 218 | unsigned int dma_is_inited:1; |
| 219 | unsigned int dma_is_enabled:1; |
| 220 | unsigned int dma_is_rxing:1; |
| 221 | unsigned int dma_is_txing:1; |
| 222 | struct dma_chan *dma_chan_rx, *dma_chan_tx; |
| 223 | struct scatterlist rx_sgl, tx_sgl[2]; |
| 224 | void *rx_buf; |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 225 | struct circ_buf rx_ring; |
| 226 | unsigned int rx_periods; |
| 227 | dma_cookie_t rx_cookie; |
Huang Shijie | 7cb92fd | 2013-10-15 15:23:40 +0800 | [diff] [blame] | 228 | unsigned int tx_bytes; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 229 | unsigned int dma_tx_nents; |
Greg Kroah-Hartman | 9ce4f8f | 2014-05-29 19:30:54 -0700 | [diff] [blame] | 230 | wait_queue_head_t dma_wait; |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 231 | unsigned int saved_reg[10]; |
Eduardo Valentin | c868cbb | 2015-08-11 10:21:23 -0700 | [diff] [blame] | 232 | bool context_saved; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | }; |
| 234 | |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 235 | struct imx_port_ucrs { |
| 236 | unsigned int ucr1; |
| 237 | unsigned int ucr2; |
| 238 | unsigned int ucr3; |
| 239 | }; |
| 240 | |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 241 | static struct imx_uart_data imx_uart_devdata[] = { |
| 242 | [IMX1_UART] = { |
| 243 | .uts_reg = IMX1_UTS, |
| 244 | .devtype = IMX1_UART, |
| 245 | }, |
| 246 | [IMX21_UART] = { |
| 247 | .uts_reg = IMX21_UTS, |
| 248 | .devtype = IMX21_UART, |
| 249 | }, |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 250 | [IMX6Q_UART] = { |
| 251 | .uts_reg = IMX21_UTS, |
| 252 | .devtype = IMX6Q_UART, |
| 253 | }, |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 254 | }; |
| 255 | |
Krzysztof Kozlowski | 31ada04 | 2015-05-02 00:40:02 +0900 | [diff] [blame] | 256 | static const struct platform_device_id imx_uart_devtype[] = { |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 257 | { |
| 258 | .name = "imx1-uart", |
| 259 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART], |
| 260 | }, { |
| 261 | .name = "imx21-uart", |
| 262 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART], |
| 263 | }, { |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 264 | .name = "imx6q-uart", |
| 265 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX6Q_UART], |
| 266 | }, { |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 267 | /* sentinel */ |
| 268 | } |
| 269 | }; |
| 270 | MODULE_DEVICE_TABLE(platform, imx_uart_devtype); |
| 271 | |
Sanjeev Sharma | ad3d4fd | 2015-02-03 16:16:06 +0530 | [diff] [blame] | 272 | static const struct of_device_id imx_uart_dt_ids[] = { |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 273 | { .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], }, |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 274 | { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], }, |
| 275 | { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], }, |
| 276 | { /* sentinel */ } |
| 277 | }; |
| 278 | MODULE_DEVICE_TABLE(of, imx_uart_dt_ids); |
| 279 | |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 280 | static inline unsigned uts_reg(struct imx_port *sport) |
| 281 | { |
| 282 | return sport->devdata->uts_reg; |
| 283 | } |
| 284 | |
| 285 | static inline int is_imx1_uart(struct imx_port *sport) |
| 286 | { |
| 287 | return sport->devdata->devtype == IMX1_UART; |
| 288 | } |
| 289 | |
| 290 | static inline int is_imx21_uart(struct imx_port *sport) |
| 291 | { |
| 292 | return sport->devdata->devtype == IMX21_UART; |
| 293 | } |
| 294 | |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 295 | static inline int is_imx6q_uart(struct imx_port *sport) |
| 296 | { |
| 297 | return sport->devdata->devtype == IMX6Q_UART; |
| 298 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /* |
fabio.estevam@freescale.com | 44a7541 | 2013-02-06 19:00:02 -0200 | [diff] [blame] | 300 | * Save and restore functions for UCR1, UCR2 and UCR3 registers |
| 301 | */ |
Fabio Estevam | 93d94b3 | 2014-11-12 15:55:07 -0200 | [diff] [blame] | 302 | #if defined(CONFIG_SERIAL_IMX_CONSOLE) |
fabio.estevam@freescale.com | 44a7541 | 2013-02-06 19:00:02 -0200 | [diff] [blame] | 303 | static void imx_port_ucrs_save(struct uart_port *port, |
| 304 | struct imx_port_ucrs *ucr) |
| 305 | { |
| 306 | /* save control registers */ |
| 307 | ucr->ucr1 = readl(port->membase + UCR1); |
| 308 | ucr->ucr2 = readl(port->membase + UCR2); |
| 309 | ucr->ucr3 = readl(port->membase + UCR3); |
| 310 | } |
| 311 | |
| 312 | static void imx_port_ucrs_restore(struct uart_port *port, |
| 313 | struct imx_port_ucrs *ucr) |
| 314 | { |
| 315 | /* restore control registers */ |
| 316 | writel(ucr->ucr1, port->membase + UCR1); |
| 317 | writel(ucr->ucr2, port->membase + UCR2); |
| 318 | writel(ucr->ucr3, port->membase + UCR3); |
| 319 | } |
Fabio Estevam | e8bfa76 | 2013-06-05 00:58:46 -0300 | [diff] [blame] | 320 | #endif |
fabio.estevam@freescale.com | 44a7541 | 2013-02-06 19:00:02 -0200 | [diff] [blame] | 321 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 322 | static void imx_port_rts_active(struct imx_port *sport, unsigned long *ucr2) |
| 323 | { |
| 324 | *ucr2 &= ~UCR2_CTSC; |
| 325 | *ucr2 |= UCR2_CTS; |
| 326 | |
| 327 | mctrl_gpio_set(sport->gpios, sport->port.mctrl | TIOCM_RTS); |
| 328 | } |
| 329 | |
| 330 | static void imx_port_rts_inactive(struct imx_port *sport, unsigned long *ucr2) |
| 331 | { |
| 332 | *ucr2 &= ~(UCR2_CTSC | UCR2_CTS); |
| 333 | |
| 334 | mctrl_gpio_set(sport->gpios, sport->port.mctrl & ~TIOCM_RTS); |
| 335 | } |
| 336 | |
| 337 | static void imx_port_rts_auto(struct imx_port *sport, unsigned long *ucr2) |
| 338 | { |
| 339 | *ucr2 |= UCR2_CTSC; |
| 340 | } |
| 341 | |
fabio.estevam@freescale.com | 44a7541 | 2013-02-06 19:00:02 -0200 | [diff] [blame] | 342 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | * interrupts disabled on entry |
| 344 | */ |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 345 | static void imx_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
| 347 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 348 | unsigned long temp; |
| 349 | |
Greg Kroah-Hartman | 9ce4f8f | 2014-05-29 19:30:54 -0700 | [diff] [blame] | 350 | /* |
| 351 | * We are maybe in the SMP context, so if the DMA TX thread is running |
| 352 | * on other cpu, we have to wait for it to finish. |
| 353 | */ |
| 354 | if (sport->dma_is_enabled && sport->dma_is_txing) |
| 355 | return; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 356 | |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 357 | temp = readl(port->membase + UCR1); |
| 358 | writel(temp & ~UCR1_TXMPTYEN, port->membase + UCR1); |
| 359 | |
| 360 | /* in rs485 mode disable transmitter if shifter is empty */ |
| 361 | if (port->rs485.flags & SER_RS485_ENABLED && |
| 362 | readl(port->membase + USR2) & USR2_TXDC) { |
| 363 | temp = readl(port->membase + UCR2); |
| 364 | if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 365 | imx_port_rts_inactive(sport, &temp); |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 366 | else |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 367 | imx_port_rts_active(sport, &temp); |
Baruch Siach | 7d1cadc | 2016-02-29 14:34:10 +0200 | [diff] [blame] | 368 | temp |= UCR2_RXEN; |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 369 | writel(temp, port->membase + UCR2); |
| 370 | |
| 371 | temp = readl(port->membase + UCR4); |
| 372 | temp &= ~UCR4_TCEN; |
| 373 | writel(temp, port->membase + UCR4); |
| 374 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | /* |
| 378 | * interrupts disabled on entry |
| 379 | */ |
| 380 | static void imx_stop_rx(struct uart_port *port) |
| 381 | { |
| 382 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 383 | unsigned long temp; |
| 384 | |
Huang Shijie | 45564a6 | 2014-09-19 15:33:12 +0800 | [diff] [blame] | 385 | if (sport->dma_is_enabled && sport->dma_is_rxing) { |
| 386 | if (sport->port.suspended) { |
| 387 | dmaengine_terminate_all(sport->dma_chan_rx); |
| 388 | sport->dma_is_rxing = 0; |
| 389 | } else { |
| 390 | return; |
| 391 | } |
| 392 | } |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 393 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 394 | temp = readl(sport->port.membase + UCR2); |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 395 | writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2); |
Huang Shijie | 8587839 | 2014-05-23 12:32:54 +0800 | [diff] [blame] | 396 | |
| 397 | /* disable the `Receiver Ready Interrrupt` */ |
| 398 | temp = readl(sport->port.membase + UCR1); |
| 399 | writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Set the modem control timer to fire immediately. |
| 404 | */ |
| 405 | static void imx_enable_ms(struct uart_port *port) |
| 406 | { |
| 407 | struct imx_port *sport = (struct imx_port *)port; |
| 408 | |
| 409 | mod_timer(&sport->timer, jiffies); |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 410 | |
| 411 | mctrl_gpio_enable_ms(sport->gpios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | |
Jiada Wang | 91a1a90 | 2014-12-09 18:11:36 +0900 | [diff] [blame] | 414 | static void imx_dma_tx(struct imx_port *sport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | static inline void imx_transmit_buffer(struct imx_port *sport) |
| 416 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 417 | struct circ_buf *xmit = &sport->port.state->xmit; |
Jiada Wang | 91a1a90 | 2014-12-09 18:11:36 +0900 | [diff] [blame] | 418 | unsigned long temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
Peter Hurley | 5e42e9a | 2014-09-02 17:39:12 -0400 | [diff] [blame] | 420 | if (sport->port.x_char) { |
| 421 | /* Send next char */ |
| 422 | writel(sport->port.x_char, sport->port.membase + URTX0); |
Jiada Wang | 7e2fb5a | 2014-12-09 18:11:35 +0900 | [diff] [blame] | 423 | sport->port.icount.tx++; |
| 424 | sport->port.x_char = 0; |
Peter Hurley | 5e42e9a | 2014-09-02 17:39:12 -0400 | [diff] [blame] | 425 | return; |
| 426 | } |
| 427 | |
| 428 | if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { |
| 429 | imx_stop_tx(&sport->port); |
| 430 | return; |
| 431 | } |
| 432 | |
Jiada Wang | 91a1a90 | 2014-12-09 18:11:36 +0900 | [diff] [blame] | 433 | if (sport->dma_is_enabled) { |
| 434 | /* |
| 435 | * We've just sent a X-char Ensure the TX DMA is enabled |
| 436 | * and the TX IRQ is disabled. |
| 437 | **/ |
| 438 | temp = readl(sport->port.membase + UCR1); |
| 439 | temp &= ~UCR1_TXMPTYEN; |
| 440 | if (sport->dma_is_txing) { |
| 441 | temp |= UCR1_TDMAEN; |
| 442 | writel(temp, sport->port.membase + UCR1); |
| 443 | } else { |
| 444 | writel(temp, sport->port.membase + UCR1); |
| 445 | imx_dma_tx(sport); |
| 446 | } |
| 447 | } |
| 448 | |
Volker Ernst | 4e4e660 | 2010-10-13 11:03:57 +0200 | [diff] [blame] | 449 | while (!uart_circ_empty(xmit) && |
Peter Hurley | 5e42e9a | 2014-09-02 17:39:12 -0400 | [diff] [blame] | 450 | !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | /* send xmit->buf[xmit->tail] |
| 452 | * out the port here */ |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 453 | writel(xmit->buf[xmit->tail], sport->port.membase + URTX0); |
Oskar Schirmer | d3810cd | 2009-06-11 14:35:01 +0100 | [diff] [blame] | 454 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | sport->port.icount.tx++; |
Sascha Hauer | 8c0b254 | 2007-02-05 16:10:16 -0800 | [diff] [blame] | 456 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Fabian Godehardt | 97775731 | 2009-06-11 14:37:19 +0100 | [diff] [blame] | 458 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 459 | uart_write_wakeup(&sport->port); |
| 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | if (uart_circ_empty(xmit)) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 462 | imx_stop_tx(&sport->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } |
| 464 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 465 | static void dma_tx_callback(void *data) |
| 466 | { |
| 467 | struct imx_port *sport = data; |
| 468 | struct scatterlist *sgl = &sport->tx_sgl[0]; |
| 469 | struct circ_buf *xmit = &sport->port.state->xmit; |
| 470 | unsigned long flags; |
Dirk Behme | a2c718c | 2014-12-09 18:11:31 +0900 | [diff] [blame] | 471 | unsigned long temp; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 472 | |
Dirk Behme | 42f752b | 2014-12-09 18:11:28 +0900 | [diff] [blame] | 473 | spin_lock_irqsave(&sport->port.lock, flags); |
| 474 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 475 | dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); |
| 476 | |
Dirk Behme | a2c718c | 2014-12-09 18:11:31 +0900 | [diff] [blame] | 477 | temp = readl(sport->port.membase + UCR1); |
| 478 | temp &= ~UCR1_TDMAEN; |
| 479 | writel(temp, sport->port.membase + UCR1); |
| 480 | |
Dirk Behme | 42f752b | 2014-12-09 18:11:28 +0900 | [diff] [blame] | 481 | /* update the stat */ |
| 482 | xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1); |
| 483 | sport->port.icount.tx += sport->tx_bytes; |
| 484 | |
| 485 | dev_dbg(sport->port.dev, "we finish the TX DMA.\n"); |
| 486 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 487 | sport->dma_is_txing = 0; |
| 488 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 489 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 490 | |
Jiada Wang | d64b860 | 2014-12-09 18:11:29 +0900 | [diff] [blame] | 491 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 492 | uart_write_wakeup(&sport->port); |
Greg Kroah-Hartman | 9ce4f8f | 2014-05-29 19:30:54 -0700 | [diff] [blame] | 493 | |
| 494 | if (waitqueue_active(&sport->dma_wait)) { |
| 495 | wake_up(&sport->dma_wait); |
| 496 | dev_dbg(sport->port.dev, "exit in %s.\n", __func__); |
| 497 | return; |
| 498 | } |
Jiada Wang | 0bbc9b8 | 2014-12-09 18:11:30 +0900 | [diff] [blame] | 499 | |
| 500 | spin_lock_irqsave(&sport->port.lock, flags); |
| 501 | if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port)) |
| 502 | imx_dma_tx(sport); |
| 503 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 504 | } |
| 505 | |
Huang Shijie | 7cb92fd | 2013-10-15 15:23:40 +0800 | [diff] [blame] | 506 | static void imx_dma_tx(struct imx_port *sport) |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 507 | { |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 508 | struct circ_buf *xmit = &sport->port.state->xmit; |
| 509 | struct scatterlist *sgl = sport->tx_sgl; |
| 510 | struct dma_async_tx_descriptor *desc; |
| 511 | struct dma_chan *chan = sport->dma_chan_tx; |
| 512 | struct device *dev = sport->port.dev; |
Dirk Behme | a2c718c | 2014-12-09 18:11:31 +0900 | [diff] [blame] | 513 | unsigned long temp; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 514 | int ret; |
| 515 | |
Dirk Behme | 42f752b | 2014-12-09 18:11:28 +0900 | [diff] [blame] | 516 | if (sport->dma_is_txing) |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 517 | return; |
| 518 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 519 | sport->tx_bytes = uart_circ_chars_pending(xmit); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 520 | |
Dirk Behme | 7942f85 | 2014-12-09 18:11:25 +0900 | [diff] [blame] | 521 | if (xmit->tail < xmit->head) { |
| 522 | sport->dma_tx_nents = 1; |
| 523 | sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes); |
| 524 | } else { |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 525 | sport->dma_tx_nents = 2; |
| 526 | sg_init_table(sgl, 2); |
| 527 | sg_set_buf(sgl, xmit->buf + xmit->tail, |
| 528 | UART_XMIT_SIZE - xmit->tail); |
| 529 | sg_set_buf(sgl + 1, xmit->buf, xmit->head); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 530 | } |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 531 | |
| 532 | ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); |
| 533 | if (ret == 0) { |
| 534 | dev_err(dev, "DMA mapping error for TX.\n"); |
| 535 | return; |
| 536 | } |
| 537 | desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, |
| 538 | DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); |
| 539 | if (!desc) { |
Dirk Behme | 2464982 | 2014-12-09 18:11:26 +0900 | [diff] [blame] | 540 | dma_unmap_sg(dev, sgl, sport->dma_tx_nents, |
| 541 | DMA_TO_DEVICE); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 542 | dev_err(dev, "We cannot prepare for the TX slave dma!\n"); |
| 543 | return; |
| 544 | } |
| 545 | desc->callback = dma_tx_callback; |
| 546 | desc->callback_param = sport; |
| 547 | |
| 548 | dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n", |
| 549 | uart_circ_chars_pending(xmit)); |
Dirk Behme | a2c718c | 2014-12-09 18:11:31 +0900 | [diff] [blame] | 550 | |
| 551 | temp = readl(sport->port.membase + UCR1); |
| 552 | temp |= UCR1_TDMAEN; |
| 553 | writel(temp, sport->port.membase + UCR1); |
| 554 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 555 | /* fire it */ |
| 556 | sport->dma_is_txing = 1; |
| 557 | dmaengine_submit(desc); |
| 558 | dma_async_issue_pending(chan); |
| 559 | return; |
| 560 | } |
| 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | /* |
| 563 | * interrupts disabled on entry |
| 564 | */ |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 565 | static void imx_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | { |
| 567 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 568 | unsigned long temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 570 | if (port->rs485.flags & SER_RS485_ENABLED) { |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 571 | temp = readl(port->membase + UCR2); |
| 572 | if (port->rs485.flags & SER_RS485_RTS_ON_SEND) |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 573 | imx_port_rts_inactive(sport, &temp); |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 574 | else |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 575 | imx_port_rts_active(sport, &temp); |
Baruch Siach | 7d1cadc | 2016-02-29 14:34:10 +0200 | [diff] [blame] | 576 | if (!(port->rs485.flags & SER_RS485_RX_DURING_TX)) |
| 577 | temp &= ~UCR2_RXEN; |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 578 | writel(temp, port->membase + UCR2); |
| 579 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 580 | /* enable transmitter and shifter empty irq */ |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 581 | temp = readl(port->membase + UCR4); |
| 582 | temp |= UCR4_TCEN; |
| 583 | writel(temp, port->membase + UCR4); |
| 584 | } |
| 585 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 586 | if (!sport->dma_is_enabled) { |
| 587 | temp = readl(sport->port.membase + UCR1); |
| 588 | writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); |
| 589 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 591 | if (sport->dma_is_enabled) { |
Jiada Wang | 91a1a90 | 2014-12-09 18:11:36 +0900 | [diff] [blame] | 592 | if (sport->port.x_char) { |
| 593 | /* We have X-char to send, so enable TX IRQ and |
| 594 | * disable TX DMA to let TX interrupt to send X-char */ |
| 595 | temp = readl(sport->port.membase + UCR1); |
| 596 | temp &= ~UCR1_TDMAEN; |
| 597 | temp |= UCR1_TXMPTYEN; |
| 598 | writel(temp, sport->port.membase + UCR1); |
| 599 | return; |
| 600 | } |
| 601 | |
Peter Hurley | 5e42e9a | 2014-09-02 17:39:12 -0400 | [diff] [blame] | 602 | if (!uart_circ_empty(&port->state->xmit) && |
| 603 | !uart_tx_stopped(port)) |
| 604 | imx_dma_tx(sport); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 605 | return; |
| 606 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 609 | static irqreturn_t imx_rtsint(int irq, void *dev_id) |
Sascha Hauer | ceca629 | 2005-10-12 19:58:08 +0100 | [diff] [blame] | 610 | { |
Jeff Garzik | 15aafa2 | 2008-02-06 01:36:20 -0800 | [diff] [blame] | 611 | struct imx_port *sport = dev_id; |
Uwe Kleine-König | 5680e94 | 2011-04-11 10:59:09 +0200 | [diff] [blame] | 612 | unsigned int val; |
Sascha Hauer | ceca629 | 2005-10-12 19:58:08 +0100 | [diff] [blame] | 613 | unsigned long flags; |
| 614 | |
| 615 | spin_lock_irqsave(&sport->port.lock, flags); |
| 616 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 617 | writel(USR1_RTSD, sport->port.membase + USR1); |
Uwe Kleine-König | 5680e94 | 2011-04-11 10:59:09 +0200 | [diff] [blame] | 618 | val = readl(sport->port.membase + USR1) & USR1_RTSS; |
Sascha Hauer | ceca629 | 2005-10-12 19:58:08 +0100 | [diff] [blame] | 619 | uart_handle_cts_change(&sport->port, !!val); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 620 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
Sascha Hauer | ceca629 | 2005-10-12 19:58:08 +0100 | [diff] [blame] | 621 | |
| 622 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 623 | return IRQ_HANDLED; |
| 624 | } |
| 625 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 626 | static irqreturn_t imx_txint(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | { |
Jeff Garzik | 15aafa2 | 2008-02-06 01:36:20 -0800 | [diff] [blame] | 628 | struct imx_port *sport = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | unsigned long flags; |
| 630 | |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 631 | spin_lock_irqsave(&sport->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | imx_transmit_buffer(sport); |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 633 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | return IRQ_HANDLED; |
| 635 | } |
| 636 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 637 | static irqreturn_t imx_rxint(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | { |
| 639 | struct imx_port *sport = dev_id; |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 640 | unsigned int rx, flg, ignored = 0; |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 641 | struct tty_port *port = &sport->port.state->port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 642 | unsigned long flags, temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 644 | spin_lock_irqsave(&sport->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
Sascha Hauer | 0d3c393 | 2008-04-17 08:43:14 +0100 | [diff] [blame] | 646 | while (readl(sport->port.membase + USR2) & USR2_RDR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | flg = TTY_NORMAL; |
| 648 | sport->port.icount.rx++; |
| 649 | |
Sascha Hauer | 0d3c393 | 2008-04-17 08:43:14 +0100 | [diff] [blame] | 650 | rx = readl(sport->port.membase + URXD0); |
| 651 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 652 | temp = readl(sport->port.membase + USR2); |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 653 | if (temp & USR2_BRCD) { |
Andy Green | 94d32f9 | 2010-02-01 13:28:54 +0100 | [diff] [blame] | 654 | writel(USR2_BRCD, sport->port.membase + USR2); |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 655 | if (uart_handle_break(&sport->port)) |
| 656 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | |
Oskar Schirmer | d3810cd | 2009-06-11 14:35:01 +0100 | [diff] [blame] | 659 | if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 660 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
Hui Wang | 019dc9e | 2011-08-24 17:41:47 +0800 | [diff] [blame] | 662 | if (unlikely(rx & URXD_ERR)) { |
| 663 | if (rx & URXD_BRK) |
| 664 | sport->port.icount.brk++; |
| 665 | else if (rx & URXD_PRERR) |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 666 | sport->port.icount.parity++; |
| 667 | else if (rx & URXD_FRMERR) |
| 668 | sport->port.icount.frame++; |
| 669 | if (rx & URXD_OVRRUN) |
| 670 | sport->port.icount.overrun++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 672 | if (rx & sport->port.ignore_status_mask) { |
| 673 | if (++ignored > 100) |
| 674 | goto out; |
| 675 | continue; |
| 676 | } |
| 677 | |
Eric Nelson | 8d267fd | 2014-12-18 12:37:13 -0700 | [diff] [blame] | 678 | rx &= (sport->port.read_status_mask | 0xFF); |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 679 | |
Hui Wang | 019dc9e | 2011-08-24 17:41:47 +0800 | [diff] [blame] | 680 | if (rx & URXD_BRK) |
| 681 | flg = TTY_BREAK; |
| 682 | else if (rx & URXD_PRERR) |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 683 | flg = TTY_PARITY; |
| 684 | else if (rx & URXD_FRMERR) |
| 685 | flg = TTY_FRAME; |
| 686 | if (rx & URXD_OVRRUN) |
| 687 | flg = TTY_OVERRUN; |
| 688 | |
| 689 | #ifdef SUPPORT_SYSRQ |
| 690 | sport->port.sysrq = 0; |
| 691 | #endif |
| 692 | } |
| 693 | |
Jiada Wang | 55d8693 | 2014-12-09 18:11:22 +0900 | [diff] [blame] | 694 | if (sport->port.ignore_status_mask & URXD_DUMMY_READ) |
| 695 | goto out; |
| 696 | |
Manfred Schlaegl | 9b28993 | 2015-06-20 19:25:35 +0200 | [diff] [blame] | 697 | if (tty_insert_flip_char(port, rx, flg) == 0) |
| 698 | sport->port.icount.buf_overrun++; |
Sascha Hauer | 864eeed | 2008-04-17 08:39:22 +0100 | [diff] [blame] | 699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
| 701 | out: |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 702 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 703 | tty_flip_buffer_push(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | |
Nandor Han | 41d98b5 | 2016-08-08 15:38:28 +0300 | [diff] [blame^] | 707 | static void clear_rx_errors(struct imx_port *sport); |
Huang Shijie | 7cb92fd | 2013-10-15 15:23:40 +0800 | [diff] [blame] | 708 | static int start_rx_dma(struct imx_port *sport); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 709 | /* |
| 710 | * If the RXFIFO is filled with some data, and then we |
| 711 | * arise a DMA operation to receive them. |
| 712 | */ |
| 713 | static void imx_dma_rxint(struct imx_port *sport) |
| 714 | { |
| 715 | unsigned long temp; |
Jiada Wang | 7363181 | 2014-12-09 18:11:23 +0900 | [diff] [blame] | 716 | unsigned long flags; |
| 717 | |
| 718 | spin_lock_irqsave(&sport->port.lock, flags); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 719 | |
| 720 | temp = readl(sport->port.membase + USR2); |
| 721 | if ((temp & USR2_RDR) && !sport->dma_is_rxing) { |
| 722 | sport->dma_is_rxing = 1; |
| 723 | |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 724 | /* disable the receiver ready and aging timer interrupts */ |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 725 | temp = readl(sport->port.membase + UCR1); |
| 726 | temp &= ~(UCR1_RRDYEN); |
| 727 | writel(temp, sport->port.membase + UCR1); |
| 728 | |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 729 | temp = readl(sport->port.membase + UCR2); |
| 730 | temp &= ~(UCR2_ATEN); |
| 731 | writel(temp, sport->port.membase + UCR2); |
| 732 | |
Nandor Han | 41d98b5 | 2016-08-08 15:38:28 +0300 | [diff] [blame^] | 733 | /* disable the rx errors interrupts */ |
| 734 | temp = readl(sport->port.membase + UCR4); |
| 735 | temp &= ~UCR4_OREN; |
| 736 | writel(temp, sport->port.membase + UCR4); |
| 737 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 738 | /* tell the DMA to receive the data. */ |
Huang Shijie | 7cb92fd | 2013-10-15 15:23:40 +0800 | [diff] [blame] | 739 | start_rx_dma(sport); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 740 | } |
Jiada Wang | 7363181 | 2014-12-09 18:11:23 +0900 | [diff] [blame] | 741 | |
| 742 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 743 | } |
| 744 | |
Uwe Kleine-König | 66f9588 | 2016-03-24 14:24:24 +0100 | [diff] [blame] | 745 | /* |
| 746 | * We have a modem side uart, so the meanings of RTS and CTS are inverted. |
| 747 | */ |
| 748 | static unsigned int imx_get_hwmctrl(struct imx_port *sport) |
| 749 | { |
| 750 | unsigned int tmp = TIOCM_DSR; |
| 751 | unsigned usr1 = readl(sport->port.membase + USR1); |
| 752 | |
| 753 | if (usr1 & USR1_RTSS) |
| 754 | tmp |= TIOCM_CTS; |
| 755 | |
| 756 | /* in DCE mode DCDIN is always 0 */ |
| 757 | if (!(usr1 & USR2_DCDIN)) |
| 758 | tmp |= TIOCM_CAR; |
| 759 | |
| 760 | if (sport->dte_mode) |
| 761 | if (!(readl(sport->port.membase + USR2) & USR2_RIIN)) |
| 762 | tmp |= TIOCM_RI; |
| 763 | |
| 764 | return tmp; |
| 765 | } |
| 766 | |
| 767 | /* |
| 768 | * Handle any change of modem status signal since we were last called. |
| 769 | */ |
| 770 | static void imx_mctrl_check(struct imx_port *sport) |
| 771 | { |
| 772 | unsigned int status, changed; |
| 773 | |
| 774 | status = imx_get_hwmctrl(sport); |
| 775 | changed = status ^ sport->old_status; |
| 776 | |
| 777 | if (changed == 0) |
| 778 | return; |
| 779 | |
| 780 | sport->old_status = status; |
| 781 | |
| 782 | if (changed & TIOCM_RI && status & TIOCM_RI) |
| 783 | sport->port.icount.rng++; |
| 784 | if (changed & TIOCM_DSR) |
| 785 | sport->port.icount.dsr++; |
| 786 | if (changed & TIOCM_CAR) |
| 787 | uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); |
| 788 | if (changed & TIOCM_CTS) |
| 789 | uart_handle_cts_change(&sport->port, status & TIOCM_CTS); |
| 790 | |
| 791 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
| 792 | } |
| 793 | |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 794 | static irqreturn_t imx_int(int irq, void *dev_id) |
| 795 | { |
| 796 | struct imx_port *sport = dev_id; |
| 797 | unsigned int sts; |
Alexander Stein | f1f836e | 2013-05-14 17:06:07 +0200 | [diff] [blame] | 798 | unsigned int sts2; |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 799 | irqreturn_t ret = IRQ_NONE; |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 800 | |
| 801 | sts = readl(sport->port.membase + USR1); |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 802 | sts2 = readl(sport->port.membase + USR2); |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 803 | |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 804 | if (sts & (USR1_RRDY | USR1_AGTIM)) { |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 805 | if (sport->dma_is_enabled) |
| 806 | imx_dma_rxint(sport); |
| 807 | else |
| 808 | imx_rxint(irq, dev_id); |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 809 | ret = IRQ_HANDLED; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 810 | } |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 811 | |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 812 | if ((sts & USR1_TRDY && |
| 813 | readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) || |
| 814 | (sts2 & USR2_TXDC && |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 815 | readl(sport->port.membase + UCR4) & UCR4_TCEN)) { |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 816 | imx_txint(irq, dev_id); |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 817 | ret = IRQ_HANDLED; |
| 818 | } |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 819 | |
Uwe Kleine-König | 27e1650 | 2016-03-24 14:24:25 +0100 | [diff] [blame] | 820 | if (sts & USR1_DTRD) { |
| 821 | unsigned long flags; |
| 822 | |
| 823 | if (sts & USR1_DTRD) |
| 824 | writel(USR1_DTRD, sport->port.membase + USR1); |
| 825 | |
| 826 | spin_lock_irqsave(&sport->port.lock, flags); |
| 827 | imx_mctrl_check(sport); |
| 828 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 829 | |
| 830 | ret = IRQ_HANDLED; |
| 831 | } |
| 832 | |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 833 | if (sts & USR1_RTSD) { |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 834 | imx_rtsint(irq, dev_id); |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 835 | ret = IRQ_HANDLED; |
| 836 | } |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 837 | |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 838 | if (sts & USR1_AWAKE) { |
Fabio Estevam | db1a9b5 | 2011-12-13 01:23:48 -0200 | [diff] [blame] | 839 | writel(USR1_AWAKE, sport->port.membase + USR1); |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 840 | ret = IRQ_HANDLED; |
| 841 | } |
Fabio Estevam | db1a9b5 | 2011-12-13 01:23:48 -0200 | [diff] [blame] | 842 | |
Alexander Stein | f1f836e | 2013-05-14 17:06:07 +0200 | [diff] [blame] | 843 | if (sts2 & USR2_ORE) { |
Alexander Stein | f1f836e | 2013-05-14 17:06:07 +0200 | [diff] [blame] | 844 | sport->port.icount.overrun++; |
Uwe Kleine-König | 91555ce | 2015-02-24 11:17:05 +0100 | [diff] [blame] | 845 | writel(USR2_ORE, sport->port.membase + USR2); |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 846 | ret = IRQ_HANDLED; |
Alexander Stein | f1f836e | 2013-05-14 17:06:07 +0200 | [diff] [blame] | 847 | } |
| 848 | |
Uwe Kleine-König | 4d845a6 | 2016-03-24 14:24:21 +0100 | [diff] [blame] | 849 | return ret; |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 850 | } |
| 851 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | /* |
| 853 | * Return TIOCSER_TEMT when transmitter is not busy. |
| 854 | */ |
| 855 | static unsigned int imx_tx_empty(struct uart_port *port) |
| 856 | { |
| 857 | struct imx_port *sport = (struct imx_port *)port; |
Huang Shijie | 1ce43e5 | 2013-10-11 18:30:59 +0800 | [diff] [blame] | 858 | unsigned int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
Huang Shijie | 1ce43e5 | 2013-10-11 18:30:59 +0800 | [diff] [blame] | 860 | ret = (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0; |
| 861 | |
| 862 | /* If the TX DMA is working, return 0. */ |
| 863 | if (sport->dma_is_enabled && sport->dma_is_txing) |
| 864 | ret = 0; |
| 865 | |
| 866 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 869 | static unsigned int imx_get_mctrl(struct uart_port *port) |
| 870 | { |
| 871 | struct imx_port *sport = (struct imx_port *)port; |
| 872 | unsigned int ret = imx_get_hwmctrl(sport); |
| 873 | |
| 874 | mctrl_gpio_get(sport->gpios, &ret); |
| 875 | |
| 876 | return ret; |
| 877 | } |
| 878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 880 | { |
Oskar Schirmer | d3810cd | 2009-06-11 14:35:01 +0100 | [diff] [blame] | 881 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 882 | unsigned long temp; |
| 883 | |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 884 | if (!(port->rs485.flags & SER_RS485_ENABLED)) { |
| 885 | temp = readl(sport->port.membase + UCR2); |
| 886 | temp &= ~(UCR2_CTS | UCR2_CTSC); |
| 887 | if (mctrl & TIOCM_RTS) |
| 888 | temp |= UCR2_CTS | UCR2_CTSC; |
| 889 | writel(temp, sport->port.membase + UCR2); |
| 890 | } |
Huang Shijie | 6b471a9 | 2013-11-29 17:29:24 +0800 | [diff] [blame] | 891 | |
Uwe Kleine-König | 90ebc48 | 2015-10-18 21:34:46 +0200 | [diff] [blame] | 892 | temp = readl(sport->port.membase + UCR3) & ~UCR3_DSR; |
| 893 | if (!(mctrl & TIOCM_DTR)) |
| 894 | temp |= UCR3_DSR; |
| 895 | writel(temp, sport->port.membase + UCR3); |
| 896 | |
Huang Shijie | 6b471a9 | 2013-11-29 17:29:24 +0800 | [diff] [blame] | 897 | temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; |
| 898 | if (mctrl & TIOCM_LOOP) |
| 899 | temp |= UTS_LOOP; |
| 900 | writel(temp, sport->port.membase + uts_reg(sport)); |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 901 | |
| 902 | mctrl_gpio_set(sport->gpios, mctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | /* |
| 906 | * Interrupts always disabled. |
| 907 | */ |
| 908 | static void imx_break_ctl(struct uart_port *port, int break_state) |
| 909 | { |
| 910 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 911 | unsigned long flags, temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
| 913 | spin_lock_irqsave(&sport->port.lock, flags); |
| 914 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 915 | temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK; |
| 916 | |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 917 | if (break_state != 0) |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 918 | temp |= UCR1_SNDBRK; |
| 919 | |
| 920 | writel(temp, sport->port.membase + UCR1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
| 922 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 923 | } |
| 924 | |
Uwe Kleine-König | cc56884 | 2015-10-18 21:34:47 +0200 | [diff] [blame] | 925 | /* |
Uwe Kleine-König | cc56884 | 2015-10-18 21:34:47 +0200 | [diff] [blame] | 926 | * This is our per-port timeout handler, for checking the |
| 927 | * modem status signals. |
| 928 | */ |
| 929 | static void imx_timeout(unsigned long data) |
| 930 | { |
| 931 | struct imx_port *sport = (struct imx_port *)data; |
| 932 | unsigned long flags; |
| 933 | |
| 934 | if (sport->port.state) { |
| 935 | spin_lock_irqsave(&sport->port.lock, flags); |
| 936 | imx_mctrl_check(sport); |
| 937 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 938 | |
| 939 | mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); |
| 940 | } |
| 941 | } |
| 942 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 943 | #define RX_BUF_SIZE (PAGE_SIZE) |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 944 | |
| 945 | /* |
Lucas Stach | 905c0de | 2015-09-04 17:52:41 +0200 | [diff] [blame] | 946 | * There are two kinds of RX DMA interrupts(such as in the MX6Q): |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 947 | * [1] the RX DMA buffer is full. |
Lucas Stach | 905c0de | 2015-09-04 17:52:41 +0200 | [diff] [blame] | 948 | * [2] the aging timer expires |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 949 | * |
Lucas Stach | 905c0de | 2015-09-04 17:52:41 +0200 | [diff] [blame] | 950 | * Condition [2] is triggered when a character has been sitting in the FIFO |
| 951 | * for at least 8 byte durations. |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 952 | */ |
| 953 | static void dma_rx_callback(void *data) |
| 954 | { |
| 955 | struct imx_port *sport = data; |
| 956 | struct dma_chan *chan = sport->dma_chan_rx; |
| 957 | struct scatterlist *sgl = &sport->rx_sgl; |
Huang Shijie | 7cb92fd | 2013-10-15 15:23:40 +0800 | [diff] [blame] | 958 | struct tty_port *port = &sport->port.state->port; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 959 | struct dma_tx_state state; |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 960 | struct circ_buf *rx_ring = &sport->rx_ring; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 961 | enum dma_status status; |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 962 | unsigned int w_bytes = 0; |
| 963 | unsigned int r_bytes; |
| 964 | unsigned int bd_size; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 965 | |
Huang Shijie | f0ef883 | 2013-10-11 18:31:01 +0800 | [diff] [blame] | 966 | status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state); |
Philipp Zabel | 392bcee | 2015-05-19 10:54:09 +0200 | [diff] [blame] | 967 | |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 968 | if (status == DMA_ERROR) { |
| 969 | dev_err(sport->port.dev, "DMA transaction error.\n"); |
Nandor Han | 41d98b5 | 2016-08-08 15:38:28 +0300 | [diff] [blame^] | 970 | clear_rx_errors(sport); |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 971 | return; |
Robin Gong | ee5e7c1 | 2014-12-09 18:11:33 +0900 | [diff] [blame] | 972 | } |
Lucas Stach | 976b39c | 2015-09-04 17:52:39 +0200 | [diff] [blame] | 973 | |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 974 | if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) { |
| 975 | |
| 976 | /* |
| 977 | * The state-residue variable represents the empty space |
| 978 | * relative to the entire buffer. Taking this in consideration |
| 979 | * the head is always calculated base on the buffer total |
| 980 | * length - DMA transaction residue. The UART script from the |
| 981 | * SDMA firmware will jump to the next buffer descriptor, |
| 982 | * once a DMA transaction if finalized (IMX53 RM - A.4.1.2.4). |
| 983 | * Taking this in consideration the tail is always at the |
| 984 | * beginning of the buffer descriptor that contains the head. |
| 985 | */ |
| 986 | |
| 987 | /* Calculate the head */ |
| 988 | rx_ring->head = sg_dma_len(sgl) - state.residue; |
| 989 | |
| 990 | /* Calculate the tail. */ |
| 991 | bd_size = sg_dma_len(sgl) / sport->rx_periods; |
| 992 | rx_ring->tail = ((rx_ring->head-1) / bd_size) * bd_size; |
| 993 | |
| 994 | if (rx_ring->head <= sg_dma_len(sgl) && |
| 995 | rx_ring->head > rx_ring->tail) { |
| 996 | |
| 997 | /* Move data from tail to head */ |
| 998 | r_bytes = rx_ring->head - rx_ring->tail; |
| 999 | |
| 1000 | /* CPU claims ownership of RX DMA buffer */ |
| 1001 | dma_sync_sg_for_cpu(sport->port.dev, sgl, 1, |
| 1002 | DMA_FROM_DEVICE); |
| 1003 | |
| 1004 | w_bytes = tty_insert_flip_string(port, |
| 1005 | sport->rx_buf + rx_ring->tail, r_bytes); |
| 1006 | |
| 1007 | /* UART retrieves ownership of RX DMA buffer */ |
| 1008 | dma_sync_sg_for_device(sport->port.dev, sgl, 1, |
| 1009 | DMA_FROM_DEVICE); |
| 1010 | |
| 1011 | if (w_bytes != r_bytes) |
| 1012 | sport->port.icount.buf_overrun++; |
| 1013 | |
| 1014 | sport->port.icount.rx += w_bytes; |
| 1015 | } else { |
| 1016 | WARN_ON(rx_ring->head > sg_dma_len(sgl)); |
| 1017 | WARN_ON(rx_ring->head <= rx_ring->tail); |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | if (w_bytes) { |
| 1022 | tty_flip_buffer_push(port); |
| 1023 | dev_dbg(sport->port.dev, "We get %d bytes.\n", w_bytes); |
| 1024 | } |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1025 | } |
| 1026 | |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1027 | /* RX DMA buffer periods */ |
| 1028 | #define RX_DMA_PERIODS 4 |
| 1029 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1030 | static int start_rx_dma(struct imx_port *sport) |
| 1031 | { |
| 1032 | struct scatterlist *sgl = &sport->rx_sgl; |
| 1033 | struct dma_chan *chan = sport->dma_chan_rx; |
| 1034 | struct device *dev = sport->port.dev; |
| 1035 | struct dma_async_tx_descriptor *desc; |
| 1036 | int ret; |
| 1037 | |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1038 | sport->rx_ring.head = 0; |
| 1039 | sport->rx_ring.tail = 0; |
| 1040 | sport->rx_periods = RX_DMA_PERIODS; |
| 1041 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1042 | sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE); |
| 1043 | ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE); |
| 1044 | if (ret == 0) { |
| 1045 | dev_err(dev, "DMA mapping error for RX.\n"); |
| 1046 | return -EINVAL; |
| 1047 | } |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1048 | |
| 1049 | desc = dmaengine_prep_dma_cyclic(chan, sg_dma_address(sgl), |
| 1050 | sg_dma_len(sgl), sg_dma_len(sgl) / sport->rx_periods, |
| 1051 | DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); |
| 1052 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1053 | if (!desc) { |
Dirk Behme | 2464982 | 2014-12-09 18:11:26 +0900 | [diff] [blame] | 1054 | dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1055 | dev_err(dev, "We cannot prepare for the RX slave dma!\n"); |
| 1056 | return -EINVAL; |
| 1057 | } |
| 1058 | desc->callback = dma_rx_callback; |
| 1059 | desc->callback_param = sport; |
| 1060 | |
| 1061 | dev_dbg(dev, "RX: prepare for the DMA.\n"); |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1062 | sport->rx_cookie = dmaengine_submit(desc); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1063 | dma_async_issue_pending(chan); |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
Nandor Han | 41d98b5 | 2016-08-08 15:38:28 +0300 | [diff] [blame^] | 1067 | static void clear_rx_errors(struct imx_port *sport) |
| 1068 | { |
| 1069 | unsigned int status_usr1, status_usr2; |
| 1070 | |
| 1071 | status_usr1 = readl(sport->port.membase + USR1); |
| 1072 | status_usr2 = readl(sport->port.membase + USR2); |
| 1073 | |
| 1074 | if (status_usr2 & USR2_BRCD) { |
| 1075 | sport->port.icount.brk++; |
| 1076 | writel(USR2_BRCD, sport->port.membase + USR2); |
| 1077 | } else if (status_usr1 & USR1_FRAMERR) { |
| 1078 | sport->port.icount.frame++; |
| 1079 | writel(USR1_FRAMERR, sport->port.membase + USR1); |
| 1080 | } else if (status_usr1 & USR1_PARITYERR) { |
| 1081 | sport->port.icount.parity++; |
| 1082 | writel(USR1_PARITYERR, sport->port.membase + USR1); |
| 1083 | } |
| 1084 | |
| 1085 | if (status_usr2 & USR2_ORE) { |
| 1086 | sport->port.icount.overrun++; |
| 1087 | writel(USR2_ORE, sport->port.membase + USR2); |
| 1088 | } |
| 1089 | |
| 1090 | } |
| 1091 | |
Lucas Stach | cc32382 | 2015-09-04 17:52:37 +0200 | [diff] [blame] | 1092 | #define TXTL_DEFAULT 2 /* reset default */ |
| 1093 | #define RXTL_DEFAULT 1 /* reset default */ |
Lucas Stach | 184bd70 | 2015-09-04 17:52:40 +0200 | [diff] [blame] | 1094 | #define TXTL_DMA 8 /* DMA burst setting */ |
| 1095 | #define RXTL_DMA 9 /* DMA burst setting */ |
Lucas Stach | cc32382 | 2015-09-04 17:52:37 +0200 | [diff] [blame] | 1096 | |
| 1097 | static void imx_setup_ufcr(struct imx_port *sport, |
| 1098 | unsigned char txwl, unsigned char rxwl) |
| 1099 | { |
| 1100 | unsigned int val; |
| 1101 | |
| 1102 | /* set receiver / transmitter trigger level */ |
| 1103 | val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE); |
| 1104 | val |= txwl << UFCR_TXTL_SHF | rxwl; |
| 1105 | writel(val, sport->port.membase + UFCR); |
| 1106 | } |
| 1107 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1108 | static void imx_uart_dma_exit(struct imx_port *sport) |
| 1109 | { |
| 1110 | if (sport->dma_chan_rx) { |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1111 | dmaengine_terminate_all(sport->dma_chan_rx); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1112 | dma_release_channel(sport->dma_chan_rx); |
| 1113 | sport->dma_chan_rx = NULL; |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1114 | sport->rx_cookie = -EINVAL; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1115 | kfree(sport->rx_buf); |
| 1116 | sport->rx_buf = NULL; |
| 1117 | } |
| 1118 | |
| 1119 | if (sport->dma_chan_tx) { |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1120 | dmaengine_terminate_all(sport->dma_chan_tx); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1121 | dma_release_channel(sport->dma_chan_tx); |
| 1122 | sport->dma_chan_tx = NULL; |
| 1123 | } |
| 1124 | |
| 1125 | sport->dma_is_inited = 0; |
| 1126 | } |
| 1127 | |
| 1128 | static int imx_uart_dma_init(struct imx_port *sport) |
| 1129 | { |
Huang Shijie | b09c74a | 2013-08-29 16:29:25 +0800 | [diff] [blame] | 1130 | struct dma_slave_config slave_config = {}; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1131 | struct device *dev = sport->port.dev; |
| 1132 | int ret; |
| 1133 | |
| 1134 | /* Prepare for RX : */ |
| 1135 | sport->dma_chan_rx = dma_request_slave_channel(dev, "rx"); |
| 1136 | if (!sport->dma_chan_rx) { |
| 1137 | dev_dbg(dev, "cannot get the DMA channel.\n"); |
| 1138 | ret = -EINVAL; |
| 1139 | goto err; |
| 1140 | } |
| 1141 | |
| 1142 | slave_config.direction = DMA_DEV_TO_MEM; |
| 1143 | slave_config.src_addr = sport->port.mapbase + URXD0; |
| 1144 | slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
Lucas Stach | 184bd70 | 2015-09-04 17:52:40 +0200 | [diff] [blame] | 1145 | /* one byte less than the watermark level to enable the aging timer */ |
| 1146 | slave_config.src_maxburst = RXTL_DMA - 1; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1147 | ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config); |
| 1148 | if (ret) { |
| 1149 | dev_err(dev, "error in RX dma configuration.\n"); |
| 1150 | goto err; |
| 1151 | } |
| 1152 | |
| 1153 | sport->rx_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 1154 | if (!sport->rx_buf) { |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1155 | ret = -ENOMEM; |
| 1156 | goto err; |
| 1157 | } |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1158 | sport->rx_ring.buf = sport->rx_buf; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1159 | |
| 1160 | /* Prepare for TX : */ |
| 1161 | sport->dma_chan_tx = dma_request_slave_channel(dev, "tx"); |
| 1162 | if (!sport->dma_chan_tx) { |
| 1163 | dev_err(dev, "cannot get the TX DMA channel!\n"); |
| 1164 | ret = -EINVAL; |
| 1165 | goto err; |
| 1166 | } |
| 1167 | |
| 1168 | slave_config.direction = DMA_MEM_TO_DEV; |
| 1169 | slave_config.dst_addr = sport->port.mapbase + URTX0; |
| 1170 | slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
Lucas Stach | 184bd70 | 2015-09-04 17:52:40 +0200 | [diff] [blame] | 1171 | slave_config.dst_maxburst = TXTL_DMA; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1172 | ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config); |
| 1173 | if (ret) { |
| 1174 | dev_err(dev, "error in TX dma configuration."); |
| 1175 | goto err; |
| 1176 | } |
| 1177 | |
| 1178 | sport->dma_is_inited = 1; |
| 1179 | |
| 1180 | return 0; |
| 1181 | err: |
| 1182 | imx_uart_dma_exit(sport); |
| 1183 | return ret; |
| 1184 | } |
| 1185 | |
| 1186 | static void imx_enable_dma(struct imx_port *sport) |
| 1187 | { |
| 1188 | unsigned long temp; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1189 | |
Greg Kroah-Hartman | 9ce4f8f | 2014-05-29 19:30:54 -0700 | [diff] [blame] | 1190 | init_waitqueue_head(&sport->dma_wait); |
| 1191 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1192 | /* set UCR1 */ |
| 1193 | temp = readl(sport->port.membase + UCR1); |
Lucas Stach | 905c0de | 2015-09-04 17:52:41 +0200 | [diff] [blame] | 1194 | temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1195 | writel(temp, sport->port.membase + UCR1); |
| 1196 | |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 1197 | temp = readl(sport->port.membase + UCR2); |
| 1198 | temp |= UCR2_ATEN; |
| 1199 | writel(temp, sport->port.membase + UCR2); |
| 1200 | |
Lucas Stach | 184bd70 | 2015-09-04 17:52:40 +0200 | [diff] [blame] | 1201 | imx_setup_ufcr(sport, TXTL_DMA, RXTL_DMA); |
| 1202 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1203 | sport->dma_is_enabled = 1; |
| 1204 | } |
| 1205 | |
| 1206 | static void imx_disable_dma(struct imx_port *sport) |
| 1207 | { |
| 1208 | unsigned long temp; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1209 | |
| 1210 | /* clear UCR1 */ |
| 1211 | temp = readl(sport->port.membase + UCR1); |
| 1212 | temp &= ~(UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN); |
| 1213 | writel(temp, sport->port.membase + UCR1); |
| 1214 | |
| 1215 | /* clear UCR2 */ |
| 1216 | temp = readl(sport->port.membase + UCR2); |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 1217 | temp &= ~(UCR2_CTSC | UCR2_CTS | UCR2_ATEN); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1218 | writel(temp, sport->port.membase + UCR2); |
| 1219 | |
Lucas Stach | 184bd70 | 2015-09-04 17:52:40 +0200 | [diff] [blame] | 1220 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
| 1221 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1222 | sport->dma_is_enabled = 0; |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1223 | } |
| 1224 | |
Valentin Longchamp | 1c5250d | 2010-05-05 11:47:07 +0200 | [diff] [blame] | 1225 | /* half the RX buffer size */ |
| 1226 | #define CTSTL 16 |
| 1227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | static int imx_startup(struct uart_port *port) |
| 1229 | { |
| 1230 | struct imx_port *sport = (struct imx_port *)port; |
Fabio Estevam | 458e2c8 | 2015-07-27 15:15:59 -0300 | [diff] [blame] | 1231 | int retval, i; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1232 | unsigned long flags, temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1234 | retval = clk_prepare_enable(sport->clk_per); |
| 1235 | if (retval) |
Fabio Estevam | cb0f0a5 | 2014-10-27 14:49:38 -0200 | [diff] [blame] | 1236 | return retval; |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1237 | retval = clk_prepare_enable(sport->clk_ipg); |
| 1238 | if (retval) { |
| 1239 | clk_disable_unprepare(sport->clk_per); |
Fabio Estevam | cb0f0a5 | 2014-10-27 14:49:38 -0200 | [diff] [blame] | 1240 | return retval; |
Huang Shijie | 0c37550 | 2013-06-09 10:01:19 +0800 | [diff] [blame] | 1241 | } |
Huang Shijie | 28eb427 | 2013-06-04 09:59:33 +0800 | [diff] [blame] | 1242 | |
Lucas Stach | cc32382 | 2015-09-04 17:52:37 +0200 | [diff] [blame] | 1243 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | |
| 1245 | /* disable the DREN bit (Data Ready interrupt enable) before |
| 1246 | * requesting IRQs |
| 1247 | */ |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1248 | temp = readl(sport->port.membase + UCR4); |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 1249 | |
Valentin Longchamp | 1c5250d | 2010-05-05 11:47:07 +0200 | [diff] [blame] | 1250 | /* set the trigger level for CTS */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1251 | temp &= ~(UCR4_CTSTL_MASK << UCR4_CTSTL_SHF); |
| 1252 | temp |= CTSTL << UCR4_CTSTL_SHF; |
Valentin Longchamp | 1c5250d | 2010-05-05 11:47:07 +0200 | [diff] [blame] | 1253 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1254 | writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
Lucas Stach | 7e11577 | 2015-09-04 17:52:42 +0200 | [diff] [blame] | 1256 | /* Can we enable the DMA support? */ |
| 1257 | if (is_imx6q_uart(sport) && !uart_console(port) && |
| 1258 | !sport->dma_is_inited) |
| 1259 | imx_uart_dma_init(sport); |
| 1260 | |
Jiada Wang | 5379418 | 2015-04-13 18:31:43 +0900 | [diff] [blame] | 1261 | spin_lock_irqsave(&sport->port.lock, flags); |
Huang Shijie | 772f899 | 2014-05-21 08:56:28 +0800 | [diff] [blame] | 1262 | /* Reset fifo's and state machines */ |
Fabio Estevam | 458e2c8 | 2015-07-27 15:15:59 -0300 | [diff] [blame] | 1263 | i = 100; |
| 1264 | |
| 1265 | temp = readl(sport->port.membase + UCR2); |
| 1266 | temp &= ~UCR2_SRST; |
| 1267 | writel(temp, sport->port.membase + UCR2); |
| 1268 | |
| 1269 | while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) |
| 1270 | udelay(1); |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | /* |
| 1273 | * Finally, clear and enable interrupts |
| 1274 | */ |
Uwe Kleine-König | 27e1650 | 2016-03-24 14:24:25 +0100 | [diff] [blame] | 1275 | writel(USR1_RTSD | USR1_DTRD, sport->port.membase + USR1); |
Uwe Kleine-König | 91555ce | 2015-02-24 11:17:05 +0100 | [diff] [blame] | 1276 | writel(USR2_ORE, sport->port.membase + USR2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
Lucas Stach | 7e11577 | 2015-09-04 17:52:42 +0200 | [diff] [blame] | 1278 | if (sport->dma_is_inited && !sport->dma_is_enabled) |
| 1279 | imx_enable_dma(sport); |
| 1280 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1281 | temp = readl(sport->port.membase + UCR1); |
Sascha Hauer | 789d525 | 2008-04-17 08:44:47 +0100 | [diff] [blame] | 1282 | temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 1283 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1284 | writel(temp, sport->port.membase + UCR1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | |
Jiada Wang | 6f026d6b | 2014-12-09 18:11:34 +0900 | [diff] [blame] | 1286 | temp = readl(sport->port.membase + UCR4); |
| 1287 | temp |= UCR4_OREN; |
| 1288 | writel(temp, sport->port.membase + UCR4); |
| 1289 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1290 | temp = readl(sport->port.membase + UCR2); |
| 1291 | temp |= (UCR2_RXEN | UCR2_TXEN); |
Lucas Stach | bff09b0 | 2013-05-30 15:47:04 +0200 | [diff] [blame] | 1292 | if (!sport->have_rtscts) |
| 1293 | temp |= UCR2_IRTS; |
Uwe Kleine-König | 16804d6 | 2016-03-24 14:24:22 +0100 | [diff] [blame] | 1294 | /* |
| 1295 | * make sure the edge sensitive RTS-irq is disabled, |
| 1296 | * we're using RTSD instead. |
| 1297 | */ |
| 1298 | if (!is_imx1_uart(sport)) |
| 1299 | temp &= ~UCR2_RTSEN; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1300 | writel(temp, sport->port.membase + UCR2); |
| 1301 | |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 1302 | if (!is_imx1_uart(sport)) { |
Sascha Hauer | 37d6fb6 | 2009-05-27 18:23:48 +0200 | [diff] [blame] | 1303 | temp = readl(sport->port.membase + UCR3); |
Uwe Kleine-König | 16804d6 | 2016-03-24 14:24:22 +0100 | [diff] [blame] | 1304 | |
| 1305 | /* |
| 1306 | * The effect of RI and DCD differs depending on the UFCR_DCEDTE |
| 1307 | * bit. In DCE mode they control the outputs, in DTE mode they |
| 1308 | * enable the respective irqs. At least the DCD irq cannot be |
| 1309 | * cleared on i.MX25 at least, so it's not usable and must be |
| 1310 | * disabled. I don't have test hardware to check if RI has the |
| 1311 | * same problem but I consider this likely so it's disabled for |
| 1312 | * now, too. |
| 1313 | */ |
| 1314 | temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP | |
Uwe Kleine-König | 27e1650 | 2016-03-24 14:24:25 +0100 | [diff] [blame] | 1315 | UCR3_DTRDEN | UCR3_RI | UCR3_DCD; |
Uwe Kleine-König | 16804d6 | 2016-03-24 14:24:22 +0100 | [diff] [blame] | 1316 | |
| 1317 | if (sport->dte_mode) |
| 1318 | temp &= ~(UCR3_RI | UCR3_DCD); |
| 1319 | |
Sascha Hauer | 37d6fb6 | 2009-05-27 18:23:48 +0200 | [diff] [blame] | 1320 | writel(temp, sport->port.membase + UCR3); |
| 1321 | } |
Marc Kleine-Budde | 4411805 | 2008-07-28 12:10:34 +0200 | [diff] [blame] | 1322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | /* |
| 1324 | * Enable modem status interrupts |
| 1325 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | imx_enable_ms(&sport->port); |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1327 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | |
| 1329 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | } |
| 1331 | |
| 1332 | static void imx_shutdown(struct uart_port *port) |
| 1333 | { |
| 1334 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1335 | unsigned long temp; |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1336 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1338 | if (sport->dma_is_enabled) { |
Nandor Han | 9d29723 | 2016-08-08 15:38:27 +0300 | [diff] [blame] | 1339 | sport->dma_is_rxing = 0; |
| 1340 | sport->dma_is_txing = 0; |
| 1341 | dmaengine_terminate_all(sport->dma_chan_tx); |
| 1342 | dmaengine_terminate_all(sport->dma_chan_rx); |
Huang Shijie | a4688bc | 2014-09-19 15:42:57 +0800 | [diff] [blame] | 1343 | |
Jiada Wang | 7363181 | 2014-12-09 18:11:23 +0900 | [diff] [blame] | 1344 | spin_lock_irqsave(&sport->port.lock, flags); |
Huang Shijie | a4688bc | 2014-09-19 15:42:57 +0800 | [diff] [blame] | 1345 | imx_stop_tx(port); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1346 | imx_stop_rx(port); |
| 1347 | imx_disable_dma(sport); |
Jiada Wang | 7363181 | 2014-12-09 18:11:23 +0900 | [diff] [blame] | 1348 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Huang Shijie | b4cdc8f | 2013-07-08 17:14:18 +0800 | [diff] [blame] | 1349 | imx_uart_dma_exit(sport); |
| 1350 | } |
| 1351 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1352 | mctrl_gpio_disable_ms(sport->gpios); |
| 1353 | |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1354 | spin_lock_irqsave(&sport->port.lock, flags); |
Fabian Godehardt | 2e14639 | 2009-06-11 14:38:38 +0100 | [diff] [blame] | 1355 | temp = readl(sport->port.membase + UCR2); |
| 1356 | temp &= ~(UCR2_TXEN); |
| 1357 | writel(temp, sport->port.membase + UCR2); |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1358 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Fabian Godehardt | 2e14639 | 2009-06-11 14:38:38 +0100 | [diff] [blame] | 1359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | /* |
| 1361 | * Stop our timer. |
| 1362 | */ |
| 1363 | del_timer_sync(&sport->timer); |
| 1364 | |
| 1365 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | * Disable all interrupts, port and break condition. |
| 1367 | */ |
| 1368 | |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1369 | spin_lock_irqsave(&sport->port.lock, flags); |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1370 | temp = readl(sport->port.membase + UCR1); |
| 1371 | temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN); |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 1372 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1373 | writel(temp, sport->port.membase + UCR1); |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1374 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Huang Shijie | 28eb427 | 2013-06-04 09:59:33 +0800 | [diff] [blame] | 1375 | |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1376 | clk_disable_unprepare(sport->clk_per); |
| 1377 | clk_disable_unprepare(sport->clk_ipg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | } |
| 1379 | |
Huang Shijie | eb56b7e | 2013-10-11 18:30:58 +0800 | [diff] [blame] | 1380 | static void imx_flush_buffer(struct uart_port *port) |
| 1381 | { |
| 1382 | struct imx_port *sport = (struct imx_port *)port; |
Dirk Behme | 82e86ae | 2014-12-09 18:11:27 +0900 | [diff] [blame] | 1383 | struct scatterlist *sgl = &sport->tx_sgl[0]; |
Dirk Behme | a2c718c | 2014-12-09 18:11:31 +0900 | [diff] [blame] | 1384 | unsigned long temp; |
Fabio Estevam | 4f86a95 | 2015-02-07 15:46:41 -0200 | [diff] [blame] | 1385 | int i = 100, ubir, ubmr, uts; |
Huang Shijie | eb56b7e | 2013-10-11 18:30:58 +0800 | [diff] [blame] | 1386 | |
Dirk Behme | 82e86ae | 2014-12-09 18:11:27 +0900 | [diff] [blame] | 1387 | if (!sport->dma_chan_tx) |
| 1388 | return; |
| 1389 | |
| 1390 | sport->tx_bytes = 0; |
| 1391 | dmaengine_terminate_all(sport->dma_chan_tx); |
| 1392 | if (sport->dma_is_txing) { |
| 1393 | dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, |
| 1394 | DMA_TO_DEVICE); |
Dirk Behme | a2c718c | 2014-12-09 18:11:31 +0900 | [diff] [blame] | 1395 | temp = readl(sport->port.membase + UCR1); |
| 1396 | temp &= ~UCR1_TDMAEN; |
| 1397 | writel(temp, sport->port.membase + UCR1); |
Dirk Behme | 82e86ae | 2014-12-09 18:11:27 +0900 | [diff] [blame] | 1398 | sport->dma_is_txing = false; |
Huang Shijie | eb56b7e | 2013-10-11 18:30:58 +0800 | [diff] [blame] | 1399 | } |
Fabio Estevam | 934084a | 2015-01-13 10:00:26 -0200 | [diff] [blame] | 1400 | |
| 1401 | /* |
| 1402 | * According to the Reference Manual description of the UART SRST bit: |
| 1403 | * "Reset the transmit and receive state machines, |
| 1404 | * all FIFOs and register USR1, USR2, UBIR, UBMR, UBRC, URXD, UTXD |
| 1405 | * and UTS[6-3]". As we don't need to restore the old values from |
| 1406 | * USR1, USR2, URXD, UTXD, only save/restore the other four registers |
| 1407 | */ |
| 1408 | ubir = readl(sport->port.membase + UBIR); |
| 1409 | ubmr = readl(sport->port.membase + UBMR); |
Fabio Estevam | 934084a | 2015-01-13 10:00:26 -0200 | [diff] [blame] | 1410 | uts = readl(sport->port.membase + IMX21_UTS); |
| 1411 | |
| 1412 | temp = readl(sport->port.membase + UCR2); |
| 1413 | temp &= ~UCR2_SRST; |
| 1414 | writel(temp, sport->port.membase + UCR2); |
| 1415 | |
| 1416 | while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) |
| 1417 | udelay(1); |
| 1418 | |
| 1419 | /* Restore the registers */ |
| 1420 | writel(ubir, sport->port.membase + UBIR); |
| 1421 | writel(ubmr, sport->port.membase + UBMR); |
Fabio Estevam | 934084a | 2015-01-13 10:00:26 -0200 | [diff] [blame] | 1422 | writel(uts, sport->port.membase + IMX21_UTS); |
Huang Shijie | eb56b7e | 2013-10-11 18:30:58 +0800 | [diff] [blame] | 1423 | } |
| 1424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1426 | imx_set_termios(struct uart_port *port, struct ktermios *termios, |
| 1427 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | { |
| 1429 | struct imx_port *sport = (struct imx_port *)port; |
| 1430 | unsigned long flags; |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1431 | unsigned long ucr2, old_ucr1, old_ucr2; |
| 1432 | unsigned int baud, quot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1434 | unsigned long div, ufcr; |
Oskar Schirmer | 534fca0 | 2009-06-11 14:52:23 +0100 | [diff] [blame] | 1435 | unsigned long num, denom; |
Oskar Schirmer | d7f8d43 | 2009-06-11 14:55:22 +0100 | [diff] [blame] | 1436 | uint64_t tdiv64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
| 1438 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | * We only support CS7 and CS8. |
| 1440 | */ |
| 1441 | while ((termios->c_cflag & CSIZE) != CS7 && |
| 1442 | (termios->c_cflag & CSIZE) != CS8) { |
| 1443 | termios->c_cflag &= ~CSIZE; |
| 1444 | termios->c_cflag |= old_csize; |
| 1445 | old_csize = CS8; |
| 1446 | } |
| 1447 | |
| 1448 | if ((termios->c_cflag & CSIZE) == CS8) |
| 1449 | ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS; |
| 1450 | else |
| 1451 | ucr2 = UCR2_SRST | UCR2_IRTS; |
| 1452 | |
| 1453 | if (termios->c_cflag & CRTSCTS) { |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1454 | if (sport->have_rtscts) { |
Sascha Hauer | 5b80234 | 2006-05-04 14:07:42 +0100 | [diff] [blame] | 1455 | ucr2 &= ~UCR2_IRTS; |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1456 | |
Fabio Estevam | 12fe59f | 2015-03-10 12:46:29 -0300 | [diff] [blame] | 1457 | if (port->rs485.flags & SER_RS485_ENABLED) { |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1458 | /* |
| 1459 | * RTS is mandatory for rs485 operation, so keep |
| 1460 | * it under manual control and keep transmitter |
| 1461 | * disabled. |
| 1462 | */ |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1463 | if (port->rs485.flags & |
| 1464 | SER_RS485_RTS_AFTER_SEND) |
| 1465 | imx_port_rts_inactive(sport, &ucr2); |
| 1466 | else |
| 1467 | imx_port_rts_active(sport, &ucr2); |
Fabio Estevam | 12fe59f | 2015-03-10 12:46:29 -0300 | [diff] [blame] | 1468 | } else { |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1469 | imx_port_rts_auto(sport, &ucr2); |
Fabio Estevam | 12fe59f | 2015-03-10 12:46:29 -0300 | [diff] [blame] | 1470 | } |
Sascha Hauer | 5b80234 | 2006-05-04 14:07:42 +0100 | [diff] [blame] | 1471 | } else { |
| 1472 | termios->c_cflag &= ~CRTSCTS; |
| 1473 | } |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1474 | } else if (port->rs485.flags & SER_RS485_ENABLED) { |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1475 | /* disable transmitter */ |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1476 | if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) |
| 1477 | imx_port_rts_inactive(sport, &ucr2); |
| 1478 | else |
| 1479 | imx_port_rts_active(sport, &ucr2); |
| 1480 | } |
| 1481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | |
| 1483 | if (termios->c_cflag & CSTOPB) |
| 1484 | ucr2 |= UCR2_STPB; |
| 1485 | if (termios->c_cflag & PARENB) { |
| 1486 | ucr2 |= UCR2_PREN; |
Matt Reimer | 3261e36 | 2006-01-13 20:51:44 +0000 | [diff] [blame] | 1487 | if (termios->c_cflag & PARODD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | ucr2 |= UCR2_PROE; |
| 1489 | } |
| 1490 | |
Eric Miao | 995234d | 2011-12-23 05:39:27 +0800 | [diff] [blame] | 1491 | del_timer_sync(&sport->timer); |
| 1492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | /* |
| 1494 | * Ask the core to calculate the divisor for us. |
| 1495 | */ |
Sascha Hauer | 036bb15 | 2008-07-05 10:02:44 +0200 | [diff] [blame] | 1496 | baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | quot = uart_get_divisor(port, baud); |
| 1498 | |
| 1499 | spin_lock_irqsave(&sport->port.lock, flags); |
| 1500 | |
| 1501 | sport->port.read_status_mask = 0; |
| 1502 | if (termios->c_iflag & INPCK) |
| 1503 | sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR); |
| 1504 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 1505 | sport->port.read_status_mask |= URXD_BRK; |
| 1506 | |
| 1507 | /* |
| 1508 | * Characters to ignore |
| 1509 | */ |
| 1510 | sport->port.ignore_status_mask = 0; |
| 1511 | if (termios->c_iflag & IGNPAR) |
Eric Nelson | 865cea8 | 2014-12-18 12:37:14 -0700 | [diff] [blame] | 1512 | sport->port.ignore_status_mask |= URXD_PRERR | URXD_FRMERR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | if (termios->c_iflag & IGNBRK) { |
| 1514 | sport->port.ignore_status_mask |= URXD_BRK; |
| 1515 | /* |
| 1516 | * If we're ignoring parity and break indicators, |
| 1517 | * ignore overruns too (for real raw support). |
| 1518 | */ |
| 1519 | if (termios->c_iflag & IGNPAR) |
| 1520 | sport->port.ignore_status_mask |= URXD_OVRRUN; |
| 1521 | } |
| 1522 | |
Jiada Wang | 55d8693 | 2014-12-09 18:11:22 +0900 | [diff] [blame] | 1523 | if ((termios->c_cflag & CREAD) == 0) |
| 1524 | sport->port.ignore_status_mask |= URXD_DUMMY_READ; |
| 1525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | /* |
| 1527 | * Update the per-port timeout. |
| 1528 | */ |
| 1529 | uart_update_timeout(port, termios->c_cflag, baud); |
| 1530 | |
| 1531 | /* |
| 1532 | * disable interrupts and drain transmitter |
| 1533 | */ |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1534 | old_ucr1 = readl(sport->port.membase + UCR1); |
| 1535 | writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN), |
| 1536 | sport->port.membase + UCR1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1538 | while (!(readl(sport->port.membase + USR2) & USR2_TXDC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | barrier(); |
| 1540 | |
| 1541 | /* then, disable everything */ |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 1542 | old_ucr2 = readl(sport->port.membase + UCR2); |
| 1543 | writel(old_ucr2 & ~(UCR2_TXEN | UCR2_RXEN), |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1544 | sport->port.membase + UCR2); |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 1545 | old_ucr2 &= (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | |
Uwe Kleine-König | afe9cbb | 2015-02-24 11:17:10 +0100 | [diff] [blame] | 1547 | /* custom-baudrate handling */ |
| 1548 | div = sport->port.uartclk / (baud * 16); |
| 1549 | if (baud == 38400 && quot != div) |
| 1550 | baud = sport->port.uartclk / (quot * 16); |
Hubert Feurstein | 09bd00f | 2013-07-18 18:52:49 +0200 | [diff] [blame] | 1551 | |
Uwe Kleine-König | afe9cbb | 2015-02-24 11:17:10 +0100 | [diff] [blame] | 1552 | div = sport->port.uartclk / (baud * 16); |
| 1553 | if (div > 7) |
| 1554 | div = 7; |
| 1555 | if (!div) |
| 1556 | div = 1; |
Sascha Hauer | 036bb15 | 2008-07-05 10:02:44 +0200 | [diff] [blame] | 1557 | |
Oskar Schirmer | 534fca0 | 2009-06-11 14:52:23 +0100 | [diff] [blame] | 1558 | rational_best_approximation(16 * div * baud, sport->port.uartclk, |
| 1559 | 1 << 16, 1 << 16, &num, &denom); |
Sascha Hauer | 036bb15 | 2008-07-05 10:02:44 +0200 | [diff] [blame] | 1560 | |
Alan Cox | eab4f5a | 2010-06-01 22:52:52 +0200 | [diff] [blame] | 1561 | tdiv64 = sport->port.uartclk; |
| 1562 | tdiv64 *= num; |
| 1563 | do_div(tdiv64, denom * 16 * div); |
| 1564 | tty_termios_encode_baud_rate(termios, |
Sascha Hauer | 1a2c4b3 | 2009-06-16 17:02:15 +0100 | [diff] [blame] | 1565 | (speed_t)tdiv64, (speed_t)tdiv64); |
Oskar Schirmer | d7f8d43 | 2009-06-11 14:55:22 +0100 | [diff] [blame] | 1566 | |
Oskar Schirmer | 534fca0 | 2009-06-11 14:52:23 +0100 | [diff] [blame] | 1567 | num -= 1; |
| 1568 | denom -= 1; |
Sascha Hauer | 036bb15 | 2008-07-05 10:02:44 +0200 | [diff] [blame] | 1569 | |
| 1570 | ufcr = readl(sport->port.membase + UFCR); |
Fabian Godehardt | b6e4913 | 2009-06-11 14:53:18 +0100 | [diff] [blame] | 1571 | ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div); |
Huang Shijie | 20ff2fe | 2013-05-30 14:07:12 +0800 | [diff] [blame] | 1572 | if (sport->dte_mode) |
| 1573 | ufcr |= UFCR_DCEDTE; |
Sascha Hauer | 036bb15 | 2008-07-05 10:02:44 +0200 | [diff] [blame] | 1574 | writel(ufcr, sport->port.membase + UFCR); |
| 1575 | |
Oskar Schirmer | 534fca0 | 2009-06-11 14:52:23 +0100 | [diff] [blame] | 1576 | writel(num, sport->port.membase + UBIR); |
| 1577 | writel(denom, sport->port.membase + UBMR); |
| 1578 | |
Huang Shijie | a496e62 | 2013-07-08 17:14:17 +0800 | [diff] [blame] | 1579 | if (!is_imx1_uart(sport)) |
Sascha Hauer | 37d6fb6 | 2009-05-27 18:23:48 +0200 | [diff] [blame] | 1580 | writel(sport->port.uartclk / div / 1000, |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 1581 | sport->port.membase + IMX21_ONEMS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1583 | writel(old_ucr1, sport->port.membase + UCR1); |
| 1584 | |
| 1585 | /* set the parity, stop bits and data size */ |
Lucas Stach | 86a04ba | 2015-09-04 17:52:38 +0200 | [diff] [blame] | 1586 | writel(ucr2 | old_ucr2, sport->port.membase + UCR2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | |
| 1588 | if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) |
| 1589 | imx_enable_ms(&sport->port); |
| 1590 | |
| 1591 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 1592 | } |
| 1593 | |
| 1594 | static const char *imx_type(struct uart_port *port) |
| 1595 | { |
| 1596 | struct imx_port *sport = (struct imx_port *)port; |
| 1597 | |
| 1598 | return sport->port.type == PORT_IMX ? "IMX" : NULL; |
| 1599 | } |
| 1600 | |
| 1601 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | * Configure/autoconfigure the port. |
| 1603 | */ |
| 1604 | static void imx_config_port(struct uart_port *port, int flags) |
| 1605 | { |
| 1606 | struct imx_port *sport = (struct imx_port *)port; |
| 1607 | |
Alexander Shiyan | da82f99 | 2014-02-22 16:01:33 +0400 | [diff] [blame] | 1608 | if (flags & UART_CONFIG_TYPE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | sport->port.type = PORT_IMX; |
| 1610 | } |
| 1611 | |
| 1612 | /* |
| 1613 | * Verify the new serial_struct (for TIOCSSERIAL). |
| 1614 | * The only change we allow are to the flags and type, and |
| 1615 | * even then only between PORT_IMX and PORT_UNKNOWN |
| 1616 | */ |
| 1617 | static int |
| 1618 | imx_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 1619 | { |
| 1620 | struct imx_port *sport = (struct imx_port *)port; |
| 1621 | int ret = 0; |
| 1622 | |
| 1623 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX) |
| 1624 | ret = -EINVAL; |
| 1625 | if (sport->port.irq != ser->irq) |
| 1626 | ret = -EINVAL; |
| 1627 | if (ser->io_type != UPIO_MEM) |
| 1628 | ret = -EINVAL; |
| 1629 | if (sport->port.uartclk / 16 != ser->baud_base) |
| 1630 | ret = -EINVAL; |
Olof Johansson | a50c44c | 2013-09-11 21:27:53 -0700 | [diff] [blame] | 1631 | if (sport->port.mapbase != (unsigned long)ser->iomem_base) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | ret = -EINVAL; |
| 1633 | if (sport->port.iobase != ser->port) |
| 1634 | ret = -EINVAL; |
| 1635 | if (ser->hub6 != 0) |
| 1636 | ret = -EINVAL; |
| 1637 | return ret; |
| 1638 | } |
| 1639 | |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1640 | #if defined(CONFIG_CONSOLE_POLL) |
Daniel Thompson | 6b8bdad | 2014-10-28 09:28:08 +0100 | [diff] [blame] | 1641 | |
| 1642 | static int imx_poll_init(struct uart_port *port) |
| 1643 | { |
| 1644 | struct imx_port *sport = (struct imx_port *)port; |
| 1645 | unsigned long flags; |
| 1646 | unsigned long temp; |
| 1647 | int retval; |
| 1648 | |
| 1649 | retval = clk_prepare_enable(sport->clk_ipg); |
| 1650 | if (retval) |
| 1651 | return retval; |
| 1652 | retval = clk_prepare_enable(sport->clk_per); |
| 1653 | if (retval) |
| 1654 | clk_disable_unprepare(sport->clk_ipg); |
| 1655 | |
Lucas Stach | cc32382 | 2015-09-04 17:52:37 +0200 | [diff] [blame] | 1656 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
Daniel Thompson | 6b8bdad | 2014-10-28 09:28:08 +0100 | [diff] [blame] | 1657 | |
| 1658 | spin_lock_irqsave(&sport->port.lock, flags); |
| 1659 | |
| 1660 | temp = readl(sport->port.membase + UCR1); |
| 1661 | if (is_imx1_uart(sport)) |
| 1662 | temp |= IMX1_UCR1_UARTCLKEN; |
| 1663 | temp |= UCR1_UARTEN | UCR1_RRDYEN; |
| 1664 | temp &= ~(UCR1_TXMPTYEN | UCR1_RTSDEN); |
| 1665 | writel(temp, sport->port.membase + UCR1); |
| 1666 | |
| 1667 | temp = readl(sport->port.membase + UCR2); |
| 1668 | temp |= UCR2_RXEN; |
| 1669 | writel(temp, sport->port.membase + UCR2); |
| 1670 | |
| 1671 | spin_unlock_irqrestore(&sport->port.lock, flags); |
| 1672 | |
| 1673 | return 0; |
| 1674 | } |
| 1675 | |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1676 | static int imx_poll_get_char(struct uart_port *port) |
| 1677 | { |
Daniel Thompson | f968ef3 | 2014-10-28 09:28:07 +0100 | [diff] [blame] | 1678 | if (!(readl_relaxed(port->membase + USR2) & USR2_RDR)) |
Dirk Behme | 26c4741 | 2014-09-03 12:33:53 +0100 | [diff] [blame] | 1679 | return NO_POLL_CHAR; |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1680 | |
Daniel Thompson | f968ef3 | 2014-10-28 09:28:07 +0100 | [diff] [blame] | 1681 | return readl_relaxed(port->membase + URXD0) & URXD_RX_DATA; |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1682 | } |
| 1683 | |
| 1684 | static void imx_poll_put_char(struct uart_port *port, unsigned char c) |
| 1685 | { |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1686 | unsigned int status; |
| 1687 | |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1688 | /* drain */ |
| 1689 | do { |
Daniel Thompson | f968ef3 | 2014-10-28 09:28:07 +0100 | [diff] [blame] | 1690 | status = readl_relaxed(port->membase + USR1); |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1691 | } while (~status & USR1_TRDY); |
| 1692 | |
| 1693 | /* write */ |
Daniel Thompson | f968ef3 | 2014-10-28 09:28:07 +0100 | [diff] [blame] | 1694 | writel_relaxed(c, port->membase + URTX0); |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1695 | |
| 1696 | /* flush */ |
| 1697 | do { |
Daniel Thompson | f968ef3 | 2014-10-28 09:28:07 +0100 | [diff] [blame] | 1698 | status = readl_relaxed(port->membase + USR2); |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1699 | } while (~status & USR2_TXDC); |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1700 | } |
| 1701 | #endif |
| 1702 | |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1703 | static int imx_rs485_config(struct uart_port *port, |
| 1704 | struct serial_rs485 *rs485conf) |
| 1705 | { |
| 1706 | struct imx_port *sport = (struct imx_port *)port; |
Baruch Siach | 7d1cadc | 2016-02-29 14:34:10 +0200 | [diff] [blame] | 1707 | unsigned long temp; |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1708 | |
| 1709 | /* unimplemented */ |
| 1710 | rs485conf->delay_rts_before_send = 0; |
| 1711 | rs485conf->delay_rts_after_send = 0; |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1712 | |
| 1713 | /* RTS is required to control the transmitter */ |
| 1714 | if (!sport->have_rtscts) |
| 1715 | rs485conf->flags &= ~SER_RS485_ENABLED; |
| 1716 | |
| 1717 | if (rs485conf->flags & SER_RS485_ENABLED) { |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1718 | /* disable transmitter */ |
| 1719 | temp = readl(sport->port.membase + UCR2); |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1720 | if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND) |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1721 | imx_port_rts_inactive(sport, &temp); |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1722 | else |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 1723 | imx_port_rts_active(sport, &temp); |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1724 | writel(temp, sport->port.membase + UCR2); |
| 1725 | } |
| 1726 | |
Baruch Siach | 7d1cadc | 2016-02-29 14:34:10 +0200 | [diff] [blame] | 1727 | /* Make sure Rx is enabled in case Tx is active with Rx disabled */ |
| 1728 | if (!(rs485conf->flags & SER_RS485_ENABLED) || |
| 1729 | rs485conf->flags & SER_RS485_RX_DURING_TX) { |
| 1730 | temp = readl(sport->port.membase + UCR2); |
| 1731 | temp |= UCR2_RXEN; |
| 1732 | writel(temp, sport->port.membase + UCR2); |
| 1733 | } |
| 1734 | |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 1735 | port->rs485 = *rs485conf; |
| 1736 | |
| 1737 | return 0; |
| 1738 | } |
| 1739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | static struct uart_ops imx_pops = { |
| 1741 | .tx_empty = imx_tx_empty, |
| 1742 | .set_mctrl = imx_set_mctrl, |
| 1743 | .get_mctrl = imx_get_mctrl, |
| 1744 | .stop_tx = imx_stop_tx, |
| 1745 | .start_tx = imx_start_tx, |
| 1746 | .stop_rx = imx_stop_rx, |
| 1747 | .enable_ms = imx_enable_ms, |
| 1748 | .break_ctl = imx_break_ctl, |
| 1749 | .startup = imx_startup, |
| 1750 | .shutdown = imx_shutdown, |
Huang Shijie | eb56b7e | 2013-10-11 18:30:58 +0800 | [diff] [blame] | 1751 | .flush_buffer = imx_flush_buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | .set_termios = imx_set_termios, |
| 1753 | .type = imx_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | .config_port = imx_config_port, |
| 1755 | .verify_port = imx_verify_port, |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1756 | #if defined(CONFIG_CONSOLE_POLL) |
Daniel Thompson | 6b8bdad | 2014-10-28 09:28:08 +0100 | [diff] [blame] | 1757 | .poll_init = imx_poll_init, |
Saleem Abdulrasool | 01f56ab | 2011-12-22 09:57:53 +0100 | [diff] [blame] | 1758 | .poll_get_char = imx_poll_get_char, |
| 1759 | .poll_put_char = imx_poll_put_char, |
| 1760 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | }; |
| 1762 | |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 1763 | static struct imx_port *imx_ports[UART_NR]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | |
| 1765 | #ifdef CONFIG_SERIAL_IMX_CONSOLE |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1766 | static void imx_console_putchar(struct uart_port *port, int ch) |
| 1767 | { |
| 1768 | struct imx_port *sport = (struct imx_port *)port; |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1769 | |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 1770 | while (readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL) |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1771 | barrier(); |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1772 | |
| 1773 | writel(ch, sport->port.membase + URTX0); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1774 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | |
| 1776 | /* |
| 1777 | * Interrupts are disabled on entering |
| 1778 | */ |
| 1779 | static void |
| 1780 | imx_console_write(struct console *co, const char *s, unsigned int count) |
| 1781 | { |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 1782 | struct imx_port *sport = imx_ports[co->index]; |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 1783 | struct imx_port_ucrs old_ucr; |
| 1784 | unsigned int ucr1; |
Shawn Guo | f30e826 | 2013-02-18 13:15:36 +0800 | [diff] [blame] | 1785 | unsigned long flags = 0; |
Thomas Gleixner | 677fe55 | 2013-02-14 21:01:06 +0100 | [diff] [blame] | 1786 | int locked = 1; |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1787 | int retval; |
| 1788 | |
Fabio Estevam | 0c727a4 | 2015-08-18 12:43:12 -0300 | [diff] [blame] | 1789 | retval = clk_enable(sport->clk_per); |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1790 | if (retval) |
| 1791 | return; |
Fabio Estevam | 0c727a4 | 2015-08-18 12:43:12 -0300 | [diff] [blame] | 1792 | retval = clk_enable(sport->clk_ipg); |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1793 | if (retval) { |
Fabio Estevam | 0c727a4 | 2015-08-18 12:43:12 -0300 | [diff] [blame] | 1794 | clk_disable(sport->clk_per); |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1795 | return; |
| 1796 | } |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1797 | |
Thomas Gleixner | 677fe55 | 2013-02-14 21:01:06 +0100 | [diff] [blame] | 1798 | if (sport->port.sysrq) |
| 1799 | locked = 0; |
| 1800 | else if (oops_in_progress) |
| 1801 | locked = spin_trylock_irqsave(&sport->port.lock, flags); |
| 1802 | else |
| 1803 | spin_lock_irqsave(&sport->port.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | |
| 1805 | /* |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 1806 | * First, save UCR1/2/3 and then disable interrupts |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | */ |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 1808 | imx_port_ucrs_save(&sport->port, &old_ucr); |
| 1809 | ucr1 = old_ucr.ucr1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 1811 | if (is_imx1_uart(sport)) |
| 1812 | ucr1 |= IMX1_UCR1_UARTCLKEN; |
Sascha Hauer | 37d6fb6 | 2009-05-27 18:23:48 +0200 | [diff] [blame] | 1813 | ucr1 |= UCR1_UARTEN; |
| 1814 | ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN); |
| 1815 | |
| 1816 | writel(ucr1, sport->port.membase + UCR1); |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1817 | |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 1818 | writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1820 | uart_console_write(&sport->port, s, count, imx_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | |
| 1822 | /* |
| 1823 | * Finally, wait for transmitter to become empty |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 1824 | * and restore UCR1/2/3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | */ |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1826 | while (!(readl(sport->port.membase + USR2) & USR2_TXDC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
Dirk Behme | 0ad5a81 | 2011-12-22 09:57:52 +0100 | [diff] [blame] | 1828 | imx_port_ucrs_restore(&sport->port, &old_ucr); |
Xinyu Chen | 9ec1882 | 2012-08-27 09:36:51 +0200 | [diff] [blame] | 1829 | |
Thomas Gleixner | 677fe55 | 2013-02-14 21:01:06 +0100 | [diff] [blame] | 1830 | if (locked) |
| 1831 | spin_unlock_irqrestore(&sport->port.lock, flags); |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1832 | |
Fabio Estevam | 0c727a4 | 2015-08-18 12:43:12 -0300 | [diff] [blame] | 1833 | clk_disable(sport->clk_ipg); |
| 1834 | clk_disable(sport->clk_per); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | } |
| 1836 | |
| 1837 | /* |
| 1838 | * If the port was already initialised (eg, by a boot loader), |
| 1839 | * try to determine the current setup. |
| 1840 | */ |
| 1841 | static void __init |
| 1842 | imx_console_get_options(struct imx_port *sport, int *baud, |
| 1843 | int *parity, int *bits) |
| 1844 | { |
Sascha Hauer | 587897f | 2005-04-29 22:46:40 +0100 | [diff] [blame] | 1845 | |
Roel Kluin | 2e2eb50 | 2009-12-09 12:31:36 -0800 | [diff] [blame] | 1846 | if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | /* ok, the port was enabled */ |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1848 | unsigned int ucr2, ubir, ubmr, uartclk; |
Sascha Hauer | 587897f | 2005-04-29 22:46:40 +0100 | [diff] [blame] | 1849 | unsigned int baud_raw; |
| 1850 | unsigned int ucfr_rfdiv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1852 | ucr2 = readl(sport->port.membase + UCR2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | |
| 1854 | *parity = 'n'; |
| 1855 | if (ucr2 & UCR2_PREN) { |
| 1856 | if (ucr2 & UCR2_PROE) |
| 1857 | *parity = 'o'; |
| 1858 | else |
| 1859 | *parity = 'e'; |
| 1860 | } |
| 1861 | |
| 1862 | if (ucr2 & UCR2_WS) |
| 1863 | *bits = 8; |
| 1864 | else |
| 1865 | *bits = 7; |
| 1866 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1867 | ubir = readl(sport->port.membase + UBIR) & 0xffff; |
| 1868 | ubmr = readl(sport->port.membase + UBMR) & 0xffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
Sascha Hauer | ff4bfb2 | 2007-04-26 08:26:13 +0100 | [diff] [blame] | 1870 | ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7; |
Sascha Hauer | 587897f | 2005-04-29 22:46:40 +0100 | [diff] [blame] | 1871 | if (ucfr_rfdiv == 6) |
| 1872 | ucfr_rfdiv = 7; |
| 1873 | else |
| 1874 | ucfr_rfdiv = 6 - ucfr_rfdiv; |
| 1875 | |
Sascha Hauer | 3a9465f | 2012-03-07 09:31:43 +0100 | [diff] [blame] | 1876 | uartclk = clk_get_rate(sport->clk_per); |
Sascha Hauer | 587897f | 2005-04-29 22:46:40 +0100 | [diff] [blame] | 1877 | uartclk /= ucfr_rfdiv; |
| 1878 | |
| 1879 | { /* |
| 1880 | * The next code provides exact computation of |
| 1881 | * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1)) |
| 1882 | * without need of float support or long long division, |
| 1883 | * which would be required to prevent 32bit arithmetic overflow |
| 1884 | */ |
| 1885 | unsigned int mul = ubir + 1; |
| 1886 | unsigned int div = 16 * (ubmr + 1); |
| 1887 | unsigned int rem = uartclk % div; |
| 1888 | |
| 1889 | baud_raw = (uartclk / div) * mul; |
| 1890 | baud_raw += (rem * mul + div / 2) / div; |
| 1891 | *baud = (baud_raw + 50) / 100 * 100; |
| 1892 | } |
| 1893 | |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1894 | if (*baud != baud_raw) |
Sachin Kamat | 50bbdba | 2013-01-07 10:25:05 +0530 | [diff] [blame] | 1895 | pr_info("Console IMX rounded baud rate from %d to %d\n", |
Sascha Hauer | 587897f | 2005-04-29 22:46:40 +0100 | [diff] [blame] | 1896 | baud_raw, *baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | } |
| 1898 | } |
| 1899 | |
| 1900 | static int __init |
| 1901 | imx_console_setup(struct console *co, char *options) |
| 1902 | { |
| 1903 | struct imx_port *sport; |
| 1904 | int baud = 9600; |
| 1905 | int bits = 8; |
| 1906 | int parity = 'n'; |
| 1907 | int flow = 'n'; |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1908 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | |
| 1910 | /* |
| 1911 | * Check whether an invalid uart number has been specified, and |
| 1912 | * if so, search for the first available port that does have |
| 1913 | * console support. |
| 1914 | */ |
| 1915 | if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports)) |
| 1916 | co->index = 0; |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 1917 | sport = imx_ports[co->index]; |
Sachin Kamat | 82313e6 | 2013-01-07 10:25:02 +0530 | [diff] [blame] | 1918 | if (sport == NULL) |
Eric Lammerts | e76afc4 | 2009-05-19 20:53:20 -0400 | [diff] [blame] | 1919 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1921 | /* For setting the registers, we only need to enable the ipg clock. */ |
| 1922 | retval = clk_prepare_enable(sport->clk_ipg); |
| 1923 | if (retval) |
| 1924 | goto error_console; |
| 1925 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | if (options) |
| 1927 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 1928 | else |
| 1929 | imx_console_get_options(sport, &baud, &parity, &bits); |
| 1930 | |
Lucas Stach | cc32382 | 2015-09-04 17:52:37 +0200 | [diff] [blame] | 1931 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
Sascha Hauer | 587897f | 2005-04-29 22:46:40 +0100 | [diff] [blame] | 1932 | |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1933 | retval = uart_set_options(&sport->port, co, baud, parity, bits, flow); |
| 1934 | |
Fabio Estevam | 0c727a4 | 2015-08-18 12:43:12 -0300 | [diff] [blame] | 1935 | clk_disable(sport->clk_ipg); |
| 1936 | if (retval) { |
| 1937 | clk_unprepare(sport->clk_ipg); |
| 1938 | goto error_console; |
| 1939 | } |
| 1940 | |
| 1941 | retval = clk_prepare(sport->clk_per); |
| 1942 | if (retval) |
| 1943 | clk_disable_unprepare(sport->clk_ipg); |
Huang Shijie | 1cf93e0 | 2013-06-28 13:39:42 +0800 | [diff] [blame] | 1944 | |
| 1945 | error_console: |
| 1946 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | } |
| 1948 | |
Vincent Sanders | 9f4426d | 2005-10-01 22:56:34 +0100 | [diff] [blame] | 1949 | static struct uart_driver imx_reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | static struct console imx_console = { |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 1951 | .name = DEV_NAME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | .write = imx_console_write, |
| 1953 | .device = uart_console_device, |
| 1954 | .setup = imx_console_setup, |
| 1955 | .flags = CON_PRINTBUFFER, |
| 1956 | .index = -1, |
| 1957 | .data = &imx_reg, |
| 1958 | }; |
| 1959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | #define IMX_CONSOLE &imx_console |
Lucas Stach | 913c6c0 | 2015-08-28 11:56:19 +0200 | [diff] [blame] | 1961 | |
| 1962 | #ifdef CONFIG_OF |
| 1963 | static void imx_console_early_putchar(struct uart_port *port, int ch) |
| 1964 | { |
| 1965 | while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL) |
| 1966 | cpu_relax(); |
| 1967 | |
| 1968 | writel_relaxed(ch, port->membase + URTX0); |
| 1969 | } |
| 1970 | |
| 1971 | static void imx_console_early_write(struct console *con, const char *s, |
| 1972 | unsigned count) |
| 1973 | { |
| 1974 | struct earlycon_device *dev = con->data; |
| 1975 | |
| 1976 | uart_console_write(&dev->port, s, count, imx_console_early_putchar); |
| 1977 | } |
| 1978 | |
| 1979 | static int __init |
| 1980 | imx_console_early_setup(struct earlycon_device *dev, const char *opt) |
| 1981 | { |
| 1982 | if (!dev->port.membase) |
| 1983 | return -ENODEV; |
| 1984 | |
| 1985 | dev->con->write = imx_console_early_write; |
| 1986 | |
| 1987 | return 0; |
| 1988 | } |
| 1989 | OF_EARLYCON_DECLARE(ec_imx6q, "fsl,imx6q-uart", imx_console_early_setup); |
| 1990 | OF_EARLYCON_DECLARE(ec_imx21, "fsl,imx21-uart", imx_console_early_setup); |
| 1991 | #endif |
| 1992 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | #else |
| 1994 | #define IMX_CONSOLE NULL |
| 1995 | #endif |
| 1996 | |
| 1997 | static struct uart_driver imx_reg = { |
| 1998 | .owner = THIS_MODULE, |
| 1999 | .driver_name = DRIVER_NAME, |
Sascha Hauer | e3d13ff | 2008-07-05 10:02:48 +0200 | [diff] [blame] | 2000 | .dev_name = DEV_NAME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | .major = SERIAL_IMX_MAJOR, |
| 2002 | .minor = MINOR_START, |
| 2003 | .nr = ARRAY_SIZE(imx_ports), |
| 2004 | .cons = IMX_CONSOLE, |
| 2005 | }; |
| 2006 | |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2007 | #ifdef CONFIG_OF |
Uwe Kleine-König | 20bb809 | 2011-12-15 09:16:34 +0100 | [diff] [blame] | 2008 | /* |
| 2009 | * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it |
| 2010 | * could successfully get all information from dt or a negative errno. |
| 2011 | */ |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2012 | static int serial_imx_probe_dt(struct imx_port *sport, |
| 2013 | struct platform_device *pdev) |
| 2014 | { |
| 2015 | struct device_node *np = pdev->dev.of_node; |
Shawn Guo | ff05967 | 2011-09-22 14:48:13 +0800 | [diff] [blame] | 2016 | int ret; |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2017 | |
LABBE Corentin | 5f8b904 | 2015-11-24 15:36:57 +0100 | [diff] [blame] | 2018 | sport->devdata = of_device_get_match_data(&pdev->dev); |
| 2019 | if (!sport->devdata) |
Uwe Kleine-König | 20bb809 | 2011-12-15 09:16:34 +0100 | [diff] [blame] | 2020 | /* no device tree device */ |
| 2021 | return 1; |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2022 | |
Shawn Guo | ff05967 | 2011-09-22 14:48:13 +0800 | [diff] [blame] | 2023 | ret = of_alias_get_id(np, "serial"); |
| 2024 | if (ret < 0) { |
| 2025 | dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); |
Uwe Kleine-König | a197a19 | 2011-12-14 21:26:51 +0100 | [diff] [blame] | 2026 | return ret; |
Shawn Guo | ff05967 | 2011-09-22 14:48:13 +0800 | [diff] [blame] | 2027 | } |
| 2028 | sport->port.line = ret; |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2029 | |
Geert Uytterhoeven | 1006ed7 | 2016-04-22 17:22:21 +0200 | [diff] [blame] | 2030 | if (of_get_property(np, "uart-has-rtscts", NULL) || |
| 2031 | of_get_property(np, "fsl,uart-has-rtscts", NULL) /* deprecated */) |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2032 | sport->have_rtscts = 1; |
| 2033 | |
Huang Shijie | 20ff2fe | 2013-05-30 14:07:12 +0800 | [diff] [blame] | 2034 | if (of_get_property(np, "fsl,dte-mode", NULL)) |
| 2035 | sport->dte_mode = 1; |
| 2036 | |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2037 | return 0; |
| 2038 | } |
| 2039 | #else |
| 2040 | static inline int serial_imx_probe_dt(struct imx_port *sport, |
| 2041 | struct platform_device *pdev) |
| 2042 | { |
Uwe Kleine-König | 20bb809 | 2011-12-15 09:16:34 +0100 | [diff] [blame] | 2043 | return 1; |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2044 | } |
| 2045 | #endif |
| 2046 | |
| 2047 | static void serial_imx_probe_pdata(struct imx_port *sport, |
| 2048 | struct platform_device *pdev) |
| 2049 | { |
Jingoo Han | 574de55 | 2013-07-30 17:06:57 +0900 | [diff] [blame] | 2050 | struct imxuart_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2051 | |
| 2052 | sport->port.line = pdev->id; |
| 2053 | sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data; |
| 2054 | |
| 2055 | if (!pdata) |
| 2056 | return; |
| 2057 | |
| 2058 | if (pdata->flags & IMXUART_HAVE_RTSCTS) |
| 2059 | sport->have_rtscts = 1; |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2060 | } |
| 2061 | |
Sascha Hauer | 2582d8c | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2062 | static int serial_imx_probe(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | { |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2064 | struct imx_port *sport; |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2065 | void __iomem *base; |
Fabio Estevam | 8a61f0c | 2015-06-17 17:35:43 -0300 | [diff] [blame] | 2066 | int ret = 0, reg; |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2067 | struct resource *res; |
Uwe Kleine-König | 842633b | 2015-02-24 11:17:07 +0100 | [diff] [blame] | 2068 | int txirq, rxirq, rtsirq; |
Sascha Hauer | 5b80234 | 2006-05-04 14:07:42 +0100 | [diff] [blame] | 2069 | |
Sachin Kamat | 42d3419 | 2013-01-07 10:25:06 +0530 | [diff] [blame] | 2070 | sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2071 | if (!sport) |
| 2072 | return -ENOMEM; |
| 2073 | |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2074 | ret = serial_imx_probe_dt(sport, pdev); |
Uwe Kleine-König | 20bb809 | 2011-12-15 09:16:34 +0100 | [diff] [blame] | 2075 | if (ret > 0) |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2076 | serial_imx_probe_pdata(sport, pdev); |
Uwe Kleine-König | 20bb809 | 2011-12-15 09:16:34 +0100 | [diff] [blame] | 2077 | else if (ret < 0) |
Sachin Kamat | 42d3419 | 2013-01-07 10:25:06 +0530 | [diff] [blame] | 2078 | return ret; |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2079 | |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2080 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Alexander Shiyan | da82f99 | 2014-02-22 16:01:33 +0400 | [diff] [blame] | 2081 | base = devm_ioremap_resource(&pdev->dev, res); |
| 2082 | if (IS_ERR(base)) |
| 2083 | return PTR_ERR(base); |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2084 | |
Uwe Kleine-König | 842633b | 2015-02-24 11:17:07 +0100 | [diff] [blame] | 2085 | rxirq = platform_get_irq(pdev, 0); |
| 2086 | txirq = platform_get_irq(pdev, 1); |
| 2087 | rtsirq = platform_get_irq(pdev, 2); |
| 2088 | |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2089 | sport->port.dev = &pdev->dev; |
| 2090 | sport->port.mapbase = res->start; |
| 2091 | sport->port.membase = base; |
| 2092 | sport->port.type = PORT_IMX, |
| 2093 | sport->port.iotype = UPIO_MEM; |
Uwe Kleine-König | 842633b | 2015-02-24 11:17:07 +0100 | [diff] [blame] | 2094 | sport->port.irq = rxirq; |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2095 | sport->port.fifosize = 32; |
| 2096 | sport->port.ops = &imx_pops; |
Uwe Kleine-König | 17b8f2a | 2015-02-24 11:17:11 +0100 | [diff] [blame] | 2097 | sport->port.rs485_config = imx_rs485_config; |
| 2098 | sport->port.rs485.flags = |
| 2099 | SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX; |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2100 | sport->port.flags = UPF_BOOT_AUTOCONF; |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2101 | init_timer(&sport->timer); |
| 2102 | sport->timer.function = imx_timeout; |
| 2103 | sport->timer.data = (unsigned long)sport; |
Sascha Hauer | 38a41fd | 2008-07-05 10:02:46 +0200 | [diff] [blame] | 2104 | |
Uwe Kleine-König | 58362d5 | 2015-12-13 11:30:03 +0100 | [diff] [blame] | 2105 | sport->gpios = mctrl_gpio_init(&sport->port, 0); |
| 2106 | if (IS_ERR(sport->gpios)) |
| 2107 | return PTR_ERR(sport->gpios); |
| 2108 | |
Sascha Hauer | 3a9465f | 2012-03-07 09:31:43 +0100 | [diff] [blame] | 2109 | sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); |
| 2110 | if (IS_ERR(sport->clk_ipg)) { |
| 2111 | ret = PTR_ERR(sport->clk_ipg); |
Uwe Kleine-König | 833462e | 2012-08-20 09:57:04 +0200 | [diff] [blame] | 2112 | dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret); |
Sachin Kamat | 42d3419 | 2013-01-07 10:25:06 +0530 | [diff] [blame] | 2113 | return ret; |
Sascha Hauer | 38a41fd | 2008-07-05 10:02:46 +0200 | [diff] [blame] | 2114 | } |
Sascha Hauer | 38a41fd | 2008-07-05 10:02:46 +0200 | [diff] [blame] | 2115 | |
Sascha Hauer | 3a9465f | 2012-03-07 09:31:43 +0100 | [diff] [blame] | 2116 | sport->clk_per = devm_clk_get(&pdev->dev, "per"); |
| 2117 | if (IS_ERR(sport->clk_per)) { |
| 2118 | ret = PTR_ERR(sport->clk_per); |
Uwe Kleine-König | 833462e | 2012-08-20 09:57:04 +0200 | [diff] [blame] | 2119 | dev_err(&pdev->dev, "failed to get per clk: %d\n", ret); |
Sachin Kamat | 42d3419 | 2013-01-07 10:25:06 +0530 | [diff] [blame] | 2120 | return ret; |
Sascha Hauer | 3a9465f | 2012-03-07 09:31:43 +0100 | [diff] [blame] | 2121 | } |
| 2122 | |
Sascha Hauer | 3a9465f | 2012-03-07 09:31:43 +0100 | [diff] [blame] | 2123 | sport->port.uartclk = clk_get_rate(sport->clk_per); |
Sascha Hauer | dbff4e9 | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2124 | |
Fabio Estevam | 8a61f0c | 2015-06-17 17:35:43 -0300 | [diff] [blame] | 2125 | /* For register access, we only need to enable the ipg clock. */ |
| 2126 | ret = clk_prepare_enable(sport->clk_ipg); |
| 2127 | if (ret) |
| 2128 | return ret; |
| 2129 | |
| 2130 | /* Disable interrupts before requesting them */ |
| 2131 | reg = readl_relaxed(sport->port.membase + UCR1); |
| 2132 | reg &= ~(UCR1_ADEN | UCR1_TRDYEN | UCR1_IDEN | UCR1_RRDYEN | |
| 2133 | UCR1_TXMPTYEN | UCR1_RTSDEN); |
| 2134 | writel_relaxed(reg, sport->port.membase + UCR1); |
| 2135 | |
| 2136 | clk_disable_unprepare(sport->clk_ipg); |
| 2137 | |
Fabio Estevam | c0d1c6b | 2014-10-27 14:49:37 -0200 | [diff] [blame] | 2138 | /* |
| 2139 | * Allocate the IRQ(s) i.MX1 has three interrupts whereas later |
| 2140 | * chips only have one interrupt. |
| 2141 | */ |
Uwe Kleine-König | 842633b | 2015-02-24 11:17:07 +0100 | [diff] [blame] | 2142 | if (txirq > 0) { |
| 2143 | ret = devm_request_irq(&pdev->dev, rxirq, imx_rxint, 0, |
Fabio Estevam | c0d1c6b | 2014-10-27 14:49:37 -0200 | [diff] [blame] | 2144 | dev_name(&pdev->dev), sport); |
| 2145 | if (ret) |
| 2146 | return ret; |
| 2147 | |
Uwe Kleine-König | 842633b | 2015-02-24 11:17:07 +0100 | [diff] [blame] | 2148 | ret = devm_request_irq(&pdev->dev, txirq, imx_txint, 0, |
Fabio Estevam | c0d1c6b | 2014-10-27 14:49:37 -0200 | [diff] [blame] | 2149 | dev_name(&pdev->dev), sport); |
| 2150 | if (ret) |
| 2151 | return ret; |
Fabio Estevam | c0d1c6b | 2014-10-27 14:49:37 -0200 | [diff] [blame] | 2152 | } else { |
Uwe Kleine-König | 842633b | 2015-02-24 11:17:07 +0100 | [diff] [blame] | 2153 | ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0, |
Fabio Estevam | c0d1c6b | 2014-10-27 14:49:37 -0200 | [diff] [blame] | 2154 | dev_name(&pdev->dev), sport); |
| 2155 | if (ret) |
| 2156 | return ret; |
| 2157 | } |
| 2158 | |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2159 | imx_ports[sport->port.line] = sport; |
Sascha Hauer | 5b80234 | 2006-05-04 14:07:42 +0100 | [diff] [blame] | 2160 | |
Richard Zhao | 0a86a86 | 2012-09-18 16:14:58 +0800 | [diff] [blame] | 2161 | platform_set_drvdata(pdev, sport); |
Sascha Hauer | 2582d8c | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2162 | |
Alexander Shiyan | 45af780 | 2014-02-22 16:01:35 +0400 | [diff] [blame] | 2163 | return uart_add_one_port(&imx_reg, &sport->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | } |
| 2165 | |
Sascha Hauer | 2582d8c | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2166 | static int serial_imx_remove(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | { |
Sascha Hauer | 2582d8c | 2008-07-05 10:02:45 +0200 | [diff] [blame] | 2168 | struct imx_port *sport = platform_get_drvdata(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | |
Alexander Shiyan | 45af780 | 2014-02-22 16:01:35 +0400 | [diff] [blame] | 2170 | return uart_remove_one_port(&imx_reg, &sport->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | } |
| 2172 | |
Eduardo Valentin | c868cbb | 2015-08-11 10:21:23 -0700 | [diff] [blame] | 2173 | static void serial_imx_restore_context(struct imx_port *sport) |
| 2174 | { |
| 2175 | if (!sport->context_saved) |
| 2176 | return; |
| 2177 | |
| 2178 | writel(sport->saved_reg[4], sport->port.membase + UFCR); |
| 2179 | writel(sport->saved_reg[5], sport->port.membase + UESC); |
| 2180 | writel(sport->saved_reg[6], sport->port.membase + UTIM); |
| 2181 | writel(sport->saved_reg[7], sport->port.membase + UBIR); |
| 2182 | writel(sport->saved_reg[8], sport->port.membase + UBMR); |
| 2183 | writel(sport->saved_reg[9], sport->port.membase + IMX21_UTS); |
| 2184 | writel(sport->saved_reg[0], sport->port.membase + UCR1); |
| 2185 | writel(sport->saved_reg[1] | UCR2_SRST, sport->port.membase + UCR2); |
| 2186 | writel(sport->saved_reg[2], sport->port.membase + UCR3); |
| 2187 | writel(sport->saved_reg[3], sport->port.membase + UCR4); |
| 2188 | sport->context_saved = false; |
| 2189 | } |
| 2190 | |
| 2191 | static void serial_imx_save_context(struct imx_port *sport) |
| 2192 | { |
| 2193 | /* Save necessary regs */ |
| 2194 | sport->saved_reg[0] = readl(sport->port.membase + UCR1); |
| 2195 | sport->saved_reg[1] = readl(sport->port.membase + UCR2); |
| 2196 | sport->saved_reg[2] = readl(sport->port.membase + UCR3); |
| 2197 | sport->saved_reg[3] = readl(sport->port.membase + UCR4); |
| 2198 | sport->saved_reg[4] = readl(sport->port.membase + UFCR); |
| 2199 | sport->saved_reg[5] = readl(sport->port.membase + UESC); |
| 2200 | sport->saved_reg[6] = readl(sport->port.membase + UTIM); |
| 2201 | sport->saved_reg[7] = readl(sport->port.membase + UBIR); |
| 2202 | sport->saved_reg[8] = readl(sport->port.membase + UBMR); |
| 2203 | sport->saved_reg[9] = readl(sport->port.membase + IMX21_UTS); |
| 2204 | sport->context_saved = true; |
| 2205 | } |
| 2206 | |
Eduardo Valentin | 189550b | 2015-08-11 10:21:21 -0700 | [diff] [blame] | 2207 | static void serial_imx_enable_wakeup(struct imx_port *sport, bool on) |
| 2208 | { |
| 2209 | unsigned int val; |
| 2210 | |
| 2211 | val = readl(sport->port.membase + UCR3); |
| 2212 | if (on) |
| 2213 | val |= UCR3_AWAKEN; |
| 2214 | else |
| 2215 | val &= ~UCR3_AWAKEN; |
| 2216 | writel(val, sport->port.membase + UCR3); |
Eduardo Valentin | bc85734 | 2015-08-11 10:21:22 -0700 | [diff] [blame] | 2217 | |
| 2218 | val = readl(sport->port.membase + UCR1); |
| 2219 | if (on) |
| 2220 | val |= UCR1_RTSDEN; |
| 2221 | else |
| 2222 | val &= ~UCR1_RTSDEN; |
| 2223 | writel(val, sport->port.membase + UCR1); |
Eduardo Valentin | 189550b | 2015-08-11 10:21:21 -0700 | [diff] [blame] | 2224 | } |
| 2225 | |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2226 | static int imx_serial_port_suspend_noirq(struct device *dev) |
| 2227 | { |
| 2228 | struct platform_device *pdev = to_platform_device(dev); |
| 2229 | struct imx_port *sport = platform_get_drvdata(pdev); |
| 2230 | int ret; |
| 2231 | |
| 2232 | ret = clk_enable(sport->clk_ipg); |
| 2233 | if (ret) |
| 2234 | return ret; |
| 2235 | |
Eduardo Valentin | c868cbb | 2015-08-11 10:21:23 -0700 | [diff] [blame] | 2236 | serial_imx_save_context(sport); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2237 | |
| 2238 | clk_disable(sport->clk_ipg); |
| 2239 | |
| 2240 | return 0; |
| 2241 | } |
| 2242 | |
| 2243 | static int imx_serial_port_resume_noirq(struct device *dev) |
| 2244 | { |
| 2245 | struct platform_device *pdev = to_platform_device(dev); |
| 2246 | struct imx_port *sport = platform_get_drvdata(pdev); |
| 2247 | int ret; |
| 2248 | |
| 2249 | ret = clk_enable(sport->clk_ipg); |
| 2250 | if (ret) |
| 2251 | return ret; |
| 2252 | |
Eduardo Valentin | c868cbb | 2015-08-11 10:21:23 -0700 | [diff] [blame] | 2253 | serial_imx_restore_context(sport); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2254 | |
| 2255 | clk_disable(sport->clk_ipg); |
| 2256 | |
| 2257 | return 0; |
| 2258 | } |
| 2259 | |
| 2260 | static int imx_serial_port_suspend(struct device *dev) |
| 2261 | { |
| 2262 | struct platform_device *pdev = to_platform_device(dev); |
| 2263 | struct imx_port *sport = platform_get_drvdata(pdev); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2264 | |
| 2265 | /* enable wakeup from i.MX UART */ |
Eduardo Valentin | 189550b | 2015-08-11 10:21:21 -0700 | [diff] [blame] | 2266 | serial_imx_enable_wakeup(sport, true); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2267 | |
| 2268 | uart_suspend_port(&imx_reg, &sport->port); |
| 2269 | |
Martin Fuzzey | 29add68 | 2016-01-05 16:53:31 +0100 | [diff] [blame] | 2270 | /* Needed to enable clock in suspend_noirq */ |
| 2271 | return clk_prepare(sport->clk_ipg); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2272 | } |
| 2273 | |
| 2274 | static int imx_serial_port_resume(struct device *dev) |
| 2275 | { |
| 2276 | struct platform_device *pdev = to_platform_device(dev); |
| 2277 | struct imx_port *sport = platform_get_drvdata(pdev); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2278 | |
| 2279 | /* disable wakeup from i.MX UART */ |
Eduardo Valentin | 189550b | 2015-08-11 10:21:21 -0700 | [diff] [blame] | 2280 | serial_imx_enable_wakeup(sport, false); |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2281 | |
| 2282 | uart_resume_port(&imx_reg, &sport->port); |
| 2283 | |
Martin Fuzzey | 29add68 | 2016-01-05 16:53:31 +0100 | [diff] [blame] | 2284 | clk_unprepare(sport->clk_ipg); |
| 2285 | |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2286 | return 0; |
| 2287 | } |
| 2288 | |
| 2289 | static const struct dev_pm_ops imx_serial_port_pm_ops = { |
| 2290 | .suspend_noirq = imx_serial_port_suspend_noirq, |
| 2291 | .resume_noirq = imx_serial_port_resume_noirq, |
| 2292 | .suspend = imx_serial_port_suspend, |
| 2293 | .resume = imx_serial_port_resume, |
| 2294 | }; |
| 2295 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 2296 | static struct platform_driver serial_imx_driver = { |
Oskar Schirmer | d3810cd | 2009-06-11 14:35:01 +0100 | [diff] [blame] | 2297 | .probe = serial_imx_probe, |
| 2298 | .remove = serial_imx_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | |
Shawn Guo | fe6b540 | 2011-06-25 02:04:33 +0800 | [diff] [blame] | 2300 | .id_table = imx_uart_devtype, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 2301 | .driver = { |
Oskar Schirmer | d3810cd | 2009-06-11 14:35:01 +0100 | [diff] [blame] | 2302 | .name = "imx-uart", |
Shawn Guo | 22698aa | 2011-06-25 02:04:34 +0800 | [diff] [blame] | 2303 | .of_match_table = imx_uart_dt_ids, |
Shenwei Wang | 90bb6bd | 2015-07-30 10:32:36 -0500 | [diff] [blame] | 2304 | .pm = &imx_serial_port_pm_ops, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 2305 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | }; |
| 2307 | |
| 2308 | static int __init imx_serial_init(void) |
| 2309 | { |
Fabio Estevam | f0fd1b7 | 2014-10-27 14:49:40 -0200 | [diff] [blame] | 2310 | int ret = uart_register_driver(&imx_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | if (ret) |
| 2313 | return ret; |
| 2314 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 2315 | ret = platform_driver_register(&serial_imx_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | if (ret != 0) |
| 2317 | uart_unregister_driver(&imx_reg); |
| 2318 | |
Uwe Kleine-König | f227824 | 2011-11-22 14:22:55 +0100 | [diff] [blame] | 2319 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | } |
| 2321 | |
| 2322 | static void __exit imx_serial_exit(void) |
| 2323 | { |
Russell King | c889b89 | 2005-11-21 17:05:21 +0000 | [diff] [blame] | 2324 | platform_driver_unregister(&serial_imx_driver); |
Sascha Hauer | 4b300c3 | 2007-07-17 13:35:46 +0100 | [diff] [blame] | 2325 | uart_unregister_driver(&imx_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | } |
| 2327 | |
| 2328 | module_init(imx_serial_init); |
| 2329 | module_exit(imx_serial_exit); |
| 2330 | |
| 2331 | MODULE_AUTHOR("Sascha Hauer"); |
| 2332 | MODULE_DESCRIPTION("IMX generic serial port driver"); |
| 2333 | MODULE_LICENSE("GPL"); |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 2334 | MODULE_ALIAS("platform:imx-uart"); |