1ab4382d2SGreg Kroah-Hartman /* 2ab4382d2SGreg Kroah-Hartman * Driver for Motorola IMX serial ports 3ab4382d2SGreg Kroah-Hartman * 4ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 5ab4382d2SGreg Kroah-Hartman * 6ab4382d2SGreg Kroah-Hartman * Author: Sascha Hauer <sascha@saschahauer.de> 7ab4382d2SGreg Kroah-Hartman * Copyright (C) 2004 Pengutronix 8ab4382d2SGreg Kroah-Hartman * 9ab4382d2SGreg Kroah-Hartman * Copyright (C) 2009 emlix GmbH 10ab4382d2SGreg Kroah-Hartman * Author: Fabian Godehardt (added IrDA support for iMX) 11ab4382d2SGreg Kroah-Hartman * 12ab4382d2SGreg Kroah-Hartman * This program is free software; you can redistribute it and/or modify 13ab4382d2SGreg Kroah-Hartman * it under the terms of the GNU General Public License as published by 14ab4382d2SGreg Kroah-Hartman * the Free Software Foundation; either version 2 of the License, or 15ab4382d2SGreg Kroah-Hartman * (at your option) any later version. 16ab4382d2SGreg Kroah-Hartman * 17ab4382d2SGreg Kroah-Hartman * This program is distributed in the hope that it will be useful, 18ab4382d2SGreg Kroah-Hartman * but WITHOUT ANY WARRANTY; without even the implied warranty of 19ab4382d2SGreg Kroah-Hartman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20ab4382d2SGreg Kroah-Hartman * GNU General Public License for more details. 21ab4382d2SGreg Kroah-Hartman * 22ab4382d2SGreg Kroah-Hartman * You should have received a copy of the GNU General Public License 23ab4382d2SGreg Kroah-Hartman * along with this program; if not, write to the Free Software 24ab4382d2SGreg Kroah-Hartman * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25ab4382d2SGreg Kroah-Hartman * 26ab4382d2SGreg Kroah-Hartman * [29-Mar-2005] Mike Lee 27ab4382d2SGreg Kroah-Hartman * Added hardware handshake 28ab4382d2SGreg Kroah-Hartman */ 29ab4382d2SGreg Kroah-Hartman 30ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 31ab4382d2SGreg Kroah-Hartman #define SUPPORT_SYSRQ 32ab4382d2SGreg Kroah-Hartman #endif 33ab4382d2SGreg Kroah-Hartman 34ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/ioport.h> 36ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 37ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 38ab4382d2SGreg Kroah-Hartman #include <linux/sysrq.h> 39ab4382d2SGreg Kroah-Hartman #include <linux/platform_device.h> 40ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 41ab4382d2SGreg Kroah-Hartman #include <linux/tty_flip.h> 42ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 43ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> 44ab4382d2SGreg Kroah-Hartman #include <linux/clk.h> 45ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 46ab4382d2SGreg Kroah-Hartman #include <linux/rational.h> 47ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 4822698aa2SShawn Guo #include <linux/of.h> 4922698aa2SShawn Guo #include <linux/of_device.h> 50e32a9f8fSSachin Kamat #include <linux/io.h> 51b4cdc8f6SHuang Shijie #include <linux/dma-mapping.h> 52ab4382d2SGreg Kroah-Hartman 53ab4382d2SGreg Kroah-Hartman #include <asm/irq.h> 5482906b13SArnd Bergmann #include <linux/platform_data/serial-imx.h> 55b4cdc8f6SHuang Shijie #include <linux/platform_data/dma-imx.h> 56ab4382d2SGreg Kroah-Hartman 57ab4382d2SGreg Kroah-Hartman /* Register definitions */ 58ab4382d2SGreg Kroah-Hartman #define URXD0 0x0 /* Receiver Register */ 59ab4382d2SGreg Kroah-Hartman #define URTX0 0x40 /* Transmitter Register */ 60ab4382d2SGreg Kroah-Hartman #define UCR1 0x80 /* Control Register 1 */ 61ab4382d2SGreg Kroah-Hartman #define UCR2 0x84 /* Control Register 2 */ 62ab4382d2SGreg Kroah-Hartman #define UCR3 0x88 /* Control Register 3 */ 63ab4382d2SGreg Kroah-Hartman #define UCR4 0x8c /* Control Register 4 */ 64ab4382d2SGreg Kroah-Hartman #define UFCR 0x90 /* FIFO Control Register */ 65ab4382d2SGreg Kroah-Hartman #define USR1 0x94 /* Status Register 1 */ 66ab4382d2SGreg Kroah-Hartman #define USR2 0x98 /* Status Register 2 */ 67ab4382d2SGreg Kroah-Hartman #define UESC 0x9c /* Escape Character Register */ 68ab4382d2SGreg Kroah-Hartman #define UTIM 0xa0 /* Escape Timer Register */ 69ab4382d2SGreg Kroah-Hartman #define UBIR 0xa4 /* BRM Incremental Register */ 70ab4382d2SGreg Kroah-Hartman #define UBMR 0xa8 /* BRM Modulator Register */ 71ab4382d2SGreg Kroah-Hartman #define UBRC 0xac /* Baud Rate Count Register */ 72fe6b540aSShawn Guo #define IMX21_ONEMS 0xb0 /* One Millisecond register */ 73fe6b540aSShawn Guo #define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */ 74fe6b540aSShawn Guo #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ 75ab4382d2SGreg Kroah-Hartman 76ab4382d2SGreg Kroah-Hartman /* UART Control Register Bit Fields.*/ 7755d8693aSJiada Wang #define URXD_DUMMY_READ (1<<16) 78ab4382d2SGreg Kroah-Hartman #define URXD_CHARRDY (1<<15) 79ab4382d2SGreg Kroah-Hartman #define URXD_ERR (1<<14) 80ab4382d2SGreg Kroah-Hartman #define URXD_OVRRUN (1<<13) 81ab4382d2SGreg Kroah-Hartman #define URXD_FRMERR (1<<12) 82ab4382d2SGreg Kroah-Hartman #define URXD_BRK (1<<11) 83ab4382d2SGreg Kroah-Hartman #define URXD_PRERR (1<<10) 8426c47412SDirk Behme #define URXD_RX_DATA (0xFF<<0) 8525985edcSLucas De Marchi #define UCR1_ADEN (1<<15) /* Auto detect interrupt */ 86ab4382d2SGreg Kroah-Hartman #define UCR1_ADBR (1<<14) /* Auto detect baud rate */ 87ab4382d2SGreg Kroah-Hartman #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */ 88ab4382d2SGreg Kroah-Hartman #define UCR1_IDEN (1<<12) /* Idle condition interrupt */ 89b4cdc8f6SHuang Shijie #define UCR1_ICD_REG(x) (((x) & 3) << 10) /* idle condition detect */ 90ab4382d2SGreg Kroah-Hartman #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */ 91ab4382d2SGreg Kroah-Hartman #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */ 92ab4382d2SGreg Kroah-Hartman #define UCR1_IREN (1<<7) /* Infrared interface enable */ 93ab4382d2SGreg Kroah-Hartman #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */ 94ab4382d2SGreg Kroah-Hartman #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */ 95ab4382d2SGreg Kroah-Hartman #define UCR1_SNDBRK (1<<4) /* Send break */ 96ab4382d2SGreg Kroah-Hartman #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */ 97fe6b540aSShawn Guo #define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */ 98b4cdc8f6SHuang Shijie #define UCR1_ATDMAEN (1<<2) /* Aging DMA Timer Enable */ 99ab4382d2SGreg Kroah-Hartman #define UCR1_DOZE (1<<1) /* Doze */ 100ab4382d2SGreg Kroah-Hartman #define UCR1_UARTEN (1<<0) /* UART enabled */ 101ab4382d2SGreg Kroah-Hartman #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */ 102ab4382d2SGreg Kroah-Hartman #define UCR2_IRTS (1<<14) /* Ignore RTS pin */ 103ab4382d2SGreg Kroah-Hartman #define UCR2_CTSC (1<<13) /* CTS pin control */ 104ab4382d2SGreg Kroah-Hartman #define UCR2_CTS (1<<12) /* Clear to send */ 105ab4382d2SGreg Kroah-Hartman #define UCR2_ESCEN (1<<11) /* Escape enable */ 106ab4382d2SGreg Kroah-Hartman #define UCR2_PREN (1<<8) /* Parity enable */ 107ab4382d2SGreg Kroah-Hartman #define UCR2_PROE (1<<7) /* Parity odd/even */ 108ab4382d2SGreg Kroah-Hartman #define UCR2_STPB (1<<6) /* Stop */ 109ab4382d2SGreg Kroah-Hartman #define UCR2_WS (1<<5) /* Word size */ 110ab4382d2SGreg Kroah-Hartman #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */ 11101f56abdSSaleem Abdulrasool #define UCR2_ATEN (1<<3) /* Aging Timer Enable */ 112ab4382d2SGreg Kroah-Hartman #define UCR2_TXEN (1<<2) /* Transmitter enabled */ 113ab4382d2SGreg Kroah-Hartman #define UCR2_RXEN (1<<1) /* Receiver enabled */ 114ab4382d2SGreg Kroah-Hartman #define UCR2_SRST (1<<0) /* SW reset */ 115ab4382d2SGreg Kroah-Hartman #define UCR3_DTREN (1<<13) /* DTR interrupt enable */ 116ab4382d2SGreg Kroah-Hartman #define UCR3_PARERREN (1<<12) /* Parity enable */ 117ab4382d2SGreg Kroah-Hartman #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */ 118ab4382d2SGreg Kroah-Hartman #define UCR3_DSR (1<<10) /* Data set ready */ 119ab4382d2SGreg Kroah-Hartman #define UCR3_DCD (1<<9) /* Data carrier detect */ 120ab4382d2SGreg Kroah-Hartman #define UCR3_RI (1<<8) /* Ring indicator */ 121b38cb7d2SFabio Estevam #define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */ 122ab4382d2SGreg Kroah-Hartman #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */ 123ab4382d2SGreg Kroah-Hartman #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */ 124ab4382d2SGreg Kroah-Hartman #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */ 125fe6b540aSShawn Guo #define IMX21_UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select */ 126ab4382d2SGreg Kroah-Hartman #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */ 127ab4382d2SGreg Kroah-Hartman #define UCR3_BPEN (1<<0) /* Preset registers enable */ 128ab4382d2SGreg Kroah-Hartman #define UCR4_CTSTL_SHF 10 /* CTS trigger level shift */ 129ab4382d2SGreg Kroah-Hartman #define UCR4_CTSTL_MASK 0x3F /* CTS trigger is 6 bits wide */ 130ab4382d2SGreg Kroah-Hartman #define UCR4_INVR (1<<9) /* Inverted infrared reception */ 131ab4382d2SGreg Kroah-Hartman #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */ 132ab4382d2SGreg Kroah-Hartman #define UCR4_WKEN (1<<7) /* Wake interrupt enable */ 133ab4382d2SGreg Kroah-Hartman #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */ 134b4cdc8f6SHuang Shijie #define UCR4_IDDMAEN (1<<6) /* DMA IDLE Condition Detected */ 135ab4382d2SGreg Kroah-Hartman #define UCR4_IRSC (1<<5) /* IR special case */ 136ab4382d2SGreg Kroah-Hartman #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */ 137ab4382d2SGreg Kroah-Hartman #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */ 138ab4382d2SGreg Kroah-Hartman #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */ 139ab4382d2SGreg Kroah-Hartman #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */ 140ab4382d2SGreg Kroah-Hartman #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */ 1417be0670fSDirk Behme #define UFCR_DCEDTE (1<<6) /* DCE/DTE mode select */ 142ab4382d2SGreg Kroah-Hartman #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */ 143ab4382d2SGreg Kroah-Hartman #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7) 144ab4382d2SGreg Kroah-Hartman #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */ 145ab4382d2SGreg Kroah-Hartman #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */ 146ab4382d2SGreg Kroah-Hartman #define USR1_RTSS (1<<14) /* RTS pin status */ 147ab4382d2SGreg Kroah-Hartman #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */ 148ab4382d2SGreg Kroah-Hartman #define USR1_RTSD (1<<12) /* RTS delta */ 149ab4382d2SGreg Kroah-Hartman #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */ 150ab4382d2SGreg Kroah-Hartman #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */ 151ab4382d2SGreg Kroah-Hartman #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */ 152ab4382d2SGreg Kroah-Hartman #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */ 153ab4382d2SGreg Kroah-Hartman #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */ 154ab4382d2SGreg Kroah-Hartman #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */ 155ab4382d2SGreg Kroah-Hartman #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */ 156ab4382d2SGreg Kroah-Hartman #define USR2_ADET (1<<15) /* Auto baud rate detect complete */ 157ab4382d2SGreg Kroah-Hartman #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ 158ab4382d2SGreg Kroah-Hartman #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ 159ab4382d2SGreg Kroah-Hartman #define USR2_IDLE (1<<12) /* Idle condition */ 160ab4382d2SGreg Kroah-Hartman #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ 161ab4382d2SGreg Kroah-Hartman #define USR2_WAKE (1<<7) /* Wake */ 162ab4382d2SGreg Kroah-Hartman #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ 163ab4382d2SGreg Kroah-Hartman #define USR2_TXDC (1<<3) /* Transmitter complete */ 164ab4382d2SGreg Kroah-Hartman #define USR2_BRCD (1<<2) /* Break condition */ 165ab4382d2SGreg Kroah-Hartman #define USR2_ORE (1<<1) /* Overrun error */ 166ab4382d2SGreg Kroah-Hartman #define USR2_RDR (1<<0) /* Recv data ready */ 167ab4382d2SGreg Kroah-Hartman #define UTS_FRCPERR (1<<13) /* Force parity error */ 168ab4382d2SGreg Kroah-Hartman #define UTS_LOOP (1<<12) /* Loop tx and rx */ 169ab4382d2SGreg Kroah-Hartman #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */ 170ab4382d2SGreg Kroah-Hartman #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */ 171ab4382d2SGreg Kroah-Hartman #define UTS_TXFULL (1<<4) /* TxFIFO full */ 172ab4382d2SGreg Kroah-Hartman #define UTS_RXFULL (1<<3) /* RxFIFO full */ 173ab4382d2SGreg Kroah-Hartman #define UTS_SOFTRST (1<<0) /* Software reset */ 174ab4382d2SGreg Kroah-Hartman 175ab4382d2SGreg Kroah-Hartman /* We've been assigned a range on the "Low-density serial ports" major */ 176ab4382d2SGreg Kroah-Hartman #define SERIAL_IMX_MAJOR 207 177ab4382d2SGreg Kroah-Hartman #define MINOR_START 16 178ab4382d2SGreg Kroah-Hartman #define DEV_NAME "ttymxc" 179ab4382d2SGreg Kroah-Hartman 180ab4382d2SGreg Kroah-Hartman /* 181ab4382d2SGreg Kroah-Hartman * This determines how often we check the modem status signals 182ab4382d2SGreg Kroah-Hartman * for any change. They generally aren't connected to an IRQ 183ab4382d2SGreg Kroah-Hartman * so we have to poll them. We also check immediately before 184ab4382d2SGreg Kroah-Hartman * filling the TX fifo incase CTS has been dropped. 185ab4382d2SGreg Kroah-Hartman */ 186ab4382d2SGreg Kroah-Hartman #define MCTRL_TIMEOUT (250*HZ/1000) 187ab4382d2SGreg Kroah-Hartman 188ab4382d2SGreg Kroah-Hartman #define DRIVER_NAME "IMX-uart" 189ab4382d2SGreg Kroah-Hartman 190ab4382d2SGreg Kroah-Hartman #define UART_NR 8 191ab4382d2SGreg Kroah-Hartman 192fe6b540aSShawn Guo /* i.mx21 type uart runs on all i.mx except i.mx1 */ 193fe6b540aSShawn Guo enum imx_uart_type { 194fe6b540aSShawn Guo IMX1_UART, 195fe6b540aSShawn Guo IMX21_UART, 196a496e628SHuang Shijie IMX6Q_UART, 197fe6b540aSShawn Guo }; 198fe6b540aSShawn Guo 199fe6b540aSShawn Guo /* device type dependent stuff */ 200fe6b540aSShawn Guo struct imx_uart_data { 201fe6b540aSShawn Guo unsigned uts_reg; 202fe6b540aSShawn Guo enum imx_uart_type devtype; 203fe6b540aSShawn Guo }; 204fe6b540aSShawn Guo 205ab4382d2SGreg Kroah-Hartman struct imx_port { 206ab4382d2SGreg Kroah-Hartman struct uart_port port; 207ab4382d2SGreg Kroah-Hartman struct timer_list timer; 208ab4382d2SGreg Kroah-Hartman unsigned int old_status; 209ab4382d2SGreg Kroah-Hartman int txirq, rxirq, rtsirq; 210ab4382d2SGreg Kroah-Hartman unsigned int have_rtscts:1; 21120ff2fe6SHuang Shijie unsigned int dte_mode:1; 212ab4382d2SGreg Kroah-Hartman unsigned int use_irda:1; 213ab4382d2SGreg Kroah-Hartman unsigned int irda_inv_rx:1; 214ab4382d2SGreg Kroah-Hartman unsigned int irda_inv_tx:1; 215ab4382d2SGreg Kroah-Hartman unsigned short trcv_delay; /* transceiver delay */ 2163a9465faSSascha Hauer struct clk *clk_ipg; 2173a9465faSSascha Hauer struct clk *clk_per; 2187d0b066fSUwe Kleine-König const struct imx_uart_data *devdata; 219b4cdc8f6SHuang Shijie 220b4cdc8f6SHuang Shijie /* DMA fields */ 221b4cdc8f6SHuang Shijie unsigned int dma_is_inited:1; 222b4cdc8f6SHuang Shijie unsigned int dma_is_enabled:1; 223b4cdc8f6SHuang Shijie unsigned int dma_is_rxing:1; 224b4cdc8f6SHuang Shijie unsigned int dma_is_txing:1; 225b4cdc8f6SHuang Shijie struct dma_chan *dma_chan_rx, *dma_chan_tx; 226b4cdc8f6SHuang Shijie struct scatterlist rx_sgl, tx_sgl[2]; 227b4cdc8f6SHuang Shijie void *rx_buf; 2287cb92fd2SHuang Shijie unsigned int tx_bytes; 229b4cdc8f6SHuang Shijie unsigned int dma_tx_nents; 2309ce4f8f3SGreg Kroah-Hartman wait_queue_head_t dma_wait; 231ab4382d2SGreg Kroah-Hartman }; 232ab4382d2SGreg Kroah-Hartman 2330ad5a814SDirk Behme struct imx_port_ucrs { 2340ad5a814SDirk Behme unsigned int ucr1; 2350ad5a814SDirk Behme unsigned int ucr2; 2360ad5a814SDirk Behme unsigned int ucr3; 2370ad5a814SDirk Behme }; 2380ad5a814SDirk Behme 239ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_IRDA 240ab4382d2SGreg Kroah-Hartman #define USE_IRDA(sport) ((sport)->use_irda) 241ab4382d2SGreg Kroah-Hartman #else 242ab4382d2SGreg Kroah-Hartman #define USE_IRDA(sport) (0) 243ab4382d2SGreg Kroah-Hartman #endif 244ab4382d2SGreg Kroah-Hartman 245fe6b540aSShawn Guo static struct imx_uart_data imx_uart_devdata[] = { 246fe6b540aSShawn Guo [IMX1_UART] = { 247fe6b540aSShawn Guo .uts_reg = IMX1_UTS, 248fe6b540aSShawn Guo .devtype = IMX1_UART, 249fe6b540aSShawn Guo }, 250fe6b540aSShawn Guo [IMX21_UART] = { 251fe6b540aSShawn Guo .uts_reg = IMX21_UTS, 252fe6b540aSShawn Guo .devtype = IMX21_UART, 253fe6b540aSShawn Guo }, 254a496e628SHuang Shijie [IMX6Q_UART] = { 255a496e628SHuang Shijie .uts_reg = IMX21_UTS, 256a496e628SHuang Shijie .devtype = IMX6Q_UART, 257a496e628SHuang Shijie }, 258fe6b540aSShawn Guo }; 259fe6b540aSShawn Guo 260fe6b540aSShawn Guo static struct platform_device_id imx_uart_devtype[] = { 261fe6b540aSShawn Guo { 262fe6b540aSShawn Guo .name = "imx1-uart", 263fe6b540aSShawn Guo .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART], 264fe6b540aSShawn Guo }, { 265fe6b540aSShawn Guo .name = "imx21-uart", 266fe6b540aSShawn Guo .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART], 267fe6b540aSShawn Guo }, { 268a496e628SHuang Shijie .name = "imx6q-uart", 269a496e628SHuang Shijie .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX6Q_UART], 270a496e628SHuang Shijie }, { 271fe6b540aSShawn Guo /* sentinel */ 272fe6b540aSShawn Guo } 273fe6b540aSShawn Guo }; 274fe6b540aSShawn Guo MODULE_DEVICE_TABLE(platform, imx_uart_devtype); 275fe6b540aSShawn Guo 27622698aa2SShawn Guo static struct of_device_id imx_uart_dt_ids[] = { 277a496e628SHuang Shijie { .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], }, 27822698aa2SShawn Guo { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], }, 27922698aa2SShawn Guo { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], }, 28022698aa2SShawn Guo { /* sentinel */ } 28122698aa2SShawn Guo }; 28222698aa2SShawn Guo MODULE_DEVICE_TABLE(of, imx_uart_dt_ids); 28322698aa2SShawn Guo 284fe6b540aSShawn Guo static inline unsigned uts_reg(struct imx_port *sport) 285fe6b540aSShawn Guo { 286fe6b540aSShawn Guo return sport->devdata->uts_reg; 287fe6b540aSShawn Guo } 288fe6b540aSShawn Guo 289fe6b540aSShawn Guo static inline int is_imx1_uart(struct imx_port *sport) 290fe6b540aSShawn Guo { 291fe6b540aSShawn Guo return sport->devdata->devtype == IMX1_UART; 292fe6b540aSShawn Guo } 293fe6b540aSShawn Guo 294fe6b540aSShawn Guo static inline int is_imx21_uart(struct imx_port *sport) 295fe6b540aSShawn Guo { 296fe6b540aSShawn Guo return sport->devdata->devtype == IMX21_UART; 297fe6b540aSShawn Guo } 298fe6b540aSShawn Guo 299a496e628SHuang Shijie static inline int is_imx6q_uart(struct imx_port *sport) 300a496e628SHuang Shijie { 301a496e628SHuang Shijie return sport->devdata->devtype == IMX6Q_UART; 302a496e628SHuang Shijie } 303ab4382d2SGreg Kroah-Hartman /* 30444a75411Sfabio.estevam@freescale.com * Save and restore functions for UCR1, UCR2 and UCR3 registers 30544a75411Sfabio.estevam@freescale.com */ 30693d94b37SFabio Estevam #if defined(CONFIG_SERIAL_IMX_CONSOLE) 30744a75411Sfabio.estevam@freescale.com static void imx_port_ucrs_save(struct uart_port *port, 30844a75411Sfabio.estevam@freescale.com struct imx_port_ucrs *ucr) 30944a75411Sfabio.estevam@freescale.com { 31044a75411Sfabio.estevam@freescale.com /* save control registers */ 31144a75411Sfabio.estevam@freescale.com ucr->ucr1 = readl(port->membase + UCR1); 31244a75411Sfabio.estevam@freescale.com ucr->ucr2 = readl(port->membase + UCR2); 31344a75411Sfabio.estevam@freescale.com ucr->ucr3 = readl(port->membase + UCR3); 31444a75411Sfabio.estevam@freescale.com } 31544a75411Sfabio.estevam@freescale.com 31644a75411Sfabio.estevam@freescale.com static void imx_port_ucrs_restore(struct uart_port *port, 31744a75411Sfabio.estevam@freescale.com struct imx_port_ucrs *ucr) 31844a75411Sfabio.estevam@freescale.com { 31944a75411Sfabio.estevam@freescale.com /* restore control registers */ 32044a75411Sfabio.estevam@freescale.com writel(ucr->ucr1, port->membase + UCR1); 32144a75411Sfabio.estevam@freescale.com writel(ucr->ucr2, port->membase + UCR2); 32244a75411Sfabio.estevam@freescale.com writel(ucr->ucr3, port->membase + UCR3); 32344a75411Sfabio.estevam@freescale.com } 324e8bfa760SFabio Estevam #endif 32544a75411Sfabio.estevam@freescale.com 32644a75411Sfabio.estevam@freescale.com /* 327ab4382d2SGreg Kroah-Hartman * Handle any change of modem status signal since we were last called. 328ab4382d2SGreg Kroah-Hartman */ 329ab4382d2SGreg Kroah-Hartman static void imx_mctrl_check(struct imx_port *sport) 330ab4382d2SGreg Kroah-Hartman { 331ab4382d2SGreg Kroah-Hartman unsigned int status, changed; 332ab4382d2SGreg Kroah-Hartman 333ab4382d2SGreg Kroah-Hartman status = sport->port.ops->get_mctrl(&sport->port); 334ab4382d2SGreg Kroah-Hartman changed = status ^ sport->old_status; 335ab4382d2SGreg Kroah-Hartman 336ab4382d2SGreg Kroah-Hartman if (changed == 0) 337ab4382d2SGreg Kroah-Hartman return; 338ab4382d2SGreg Kroah-Hartman 339ab4382d2SGreg Kroah-Hartman sport->old_status = status; 340ab4382d2SGreg Kroah-Hartman 341ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_RI) 342ab4382d2SGreg Kroah-Hartman sport->port.icount.rng++; 343ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_DSR) 344ab4382d2SGreg Kroah-Hartman sport->port.icount.dsr++; 345ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_CAR) 346ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); 347ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_CTS) 348ab4382d2SGreg Kroah-Hartman uart_handle_cts_change(&sport->port, status & TIOCM_CTS); 349ab4382d2SGreg Kroah-Hartman 350ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&sport->port.state->port.delta_msr_wait); 351ab4382d2SGreg Kroah-Hartman } 352ab4382d2SGreg Kroah-Hartman 353ab4382d2SGreg Kroah-Hartman /* 354ab4382d2SGreg Kroah-Hartman * This is our per-port timeout handler, for checking the 355ab4382d2SGreg Kroah-Hartman * modem status signals. 356ab4382d2SGreg Kroah-Hartman */ 357ab4382d2SGreg Kroah-Hartman static void imx_timeout(unsigned long data) 358ab4382d2SGreg Kroah-Hartman { 359ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)data; 360ab4382d2SGreg Kroah-Hartman unsigned long flags; 361ab4382d2SGreg Kroah-Hartman 362ab4382d2SGreg Kroah-Hartman if (sport->port.state) { 363ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 364ab4382d2SGreg Kroah-Hartman imx_mctrl_check(sport); 365ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 366ab4382d2SGreg Kroah-Hartman 367ab4382d2SGreg Kroah-Hartman mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); 368ab4382d2SGreg Kroah-Hartman } 369ab4382d2SGreg Kroah-Hartman } 370ab4382d2SGreg Kroah-Hartman 371ab4382d2SGreg Kroah-Hartman /* 372ab4382d2SGreg Kroah-Hartman * interrupts disabled on entry 373ab4382d2SGreg Kroah-Hartman */ 374ab4382d2SGreg Kroah-Hartman static void imx_stop_tx(struct uart_port *port) 375ab4382d2SGreg Kroah-Hartman { 376ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 377ab4382d2SGreg Kroah-Hartman unsigned long temp; 378ab4382d2SGreg Kroah-Hartman 379ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 380ab4382d2SGreg Kroah-Hartman /* half duplex - wait for end of transmission */ 381ab4382d2SGreg Kroah-Hartman int n = 256; 382ab4382d2SGreg Kroah-Hartman while ((--n > 0) && 383ab4382d2SGreg Kroah-Hartman !(readl(sport->port.membase + USR2) & USR2_TXDC)) { 384ab4382d2SGreg Kroah-Hartman udelay(5); 385ab4382d2SGreg Kroah-Hartman barrier(); 386ab4382d2SGreg Kroah-Hartman } 387ab4382d2SGreg Kroah-Hartman /* 388ab4382d2SGreg Kroah-Hartman * irda transceiver - wait a bit more to avoid 389ab4382d2SGreg Kroah-Hartman * cutoff, hardware dependent 390ab4382d2SGreg Kroah-Hartman */ 391ab4382d2SGreg Kroah-Hartman udelay(sport->trcv_delay); 392ab4382d2SGreg Kroah-Hartman 393ab4382d2SGreg Kroah-Hartman /* 394ab4382d2SGreg Kroah-Hartman * half duplex - reactivate receive mode, 395ab4382d2SGreg Kroah-Hartman * flush receive pipe echo crap 396ab4382d2SGreg Kroah-Hartman */ 397ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + USR2) & USR2_TXDC) { 398ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 399ab4382d2SGreg Kroah-Hartman temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN); 400ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 401ab4382d2SGreg Kroah-Hartman 402ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 403ab4382d2SGreg Kroah-Hartman temp &= ~(UCR4_TCEN); 404ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR4); 405ab4382d2SGreg Kroah-Hartman 406ab4382d2SGreg Kroah-Hartman while (readl(sport->port.membase + URXD0) & 407ab4382d2SGreg Kroah-Hartman URXD_CHARRDY) 408ab4382d2SGreg Kroah-Hartman barrier(); 409ab4382d2SGreg Kroah-Hartman 410ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 411ab4382d2SGreg Kroah-Hartman temp |= UCR1_RRDYEN; 412ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 413ab4382d2SGreg Kroah-Hartman 414ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 415ab4382d2SGreg Kroah-Hartman temp |= UCR4_DREN; 416ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR4); 417ab4382d2SGreg Kroah-Hartman } 418ab4382d2SGreg Kroah-Hartman return; 419ab4382d2SGreg Kroah-Hartman } 420ab4382d2SGreg Kroah-Hartman 4219ce4f8f3SGreg Kroah-Hartman /* 4229ce4f8f3SGreg Kroah-Hartman * We are maybe in the SMP context, so if the DMA TX thread is running 4239ce4f8f3SGreg Kroah-Hartman * on other cpu, we have to wait for it to finish. 4249ce4f8f3SGreg Kroah-Hartman */ 4259ce4f8f3SGreg Kroah-Hartman if (sport->dma_is_enabled && sport->dma_is_txing) 4269ce4f8f3SGreg Kroah-Hartman return; 427b4cdc8f6SHuang Shijie 428ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 429ab4382d2SGreg Kroah-Hartman writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1); 430ab4382d2SGreg Kroah-Hartman } 431ab4382d2SGreg Kroah-Hartman 432ab4382d2SGreg Kroah-Hartman /* 433ab4382d2SGreg Kroah-Hartman * interrupts disabled on entry 434ab4382d2SGreg Kroah-Hartman */ 435ab4382d2SGreg Kroah-Hartman static void imx_stop_rx(struct uart_port *port) 436ab4382d2SGreg Kroah-Hartman { 437ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 438ab4382d2SGreg Kroah-Hartman unsigned long temp; 439ab4382d2SGreg Kroah-Hartman 44045564a66SHuang Shijie if (sport->dma_is_enabled && sport->dma_is_rxing) { 44145564a66SHuang Shijie if (sport->port.suspended) { 44245564a66SHuang Shijie dmaengine_terminate_all(sport->dma_chan_rx); 44345564a66SHuang Shijie sport->dma_is_rxing = 0; 44445564a66SHuang Shijie } else { 4459ce4f8f3SGreg Kroah-Hartman return; 44645564a66SHuang Shijie } 44745564a66SHuang Shijie } 448b4cdc8f6SHuang Shijie 449ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 450ab4382d2SGreg Kroah-Hartman writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2); 45185878399SHuang Shijie 45285878399SHuang Shijie /* disable the `Receiver Ready Interrrupt` */ 45385878399SHuang Shijie temp = readl(sport->port.membase + UCR1); 45485878399SHuang Shijie writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1); 455ab4382d2SGreg Kroah-Hartman } 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman /* 458ab4382d2SGreg Kroah-Hartman * Set the modem control timer to fire immediately. 459ab4382d2SGreg Kroah-Hartman */ 460ab4382d2SGreg Kroah-Hartman static void imx_enable_ms(struct uart_port *port) 461ab4382d2SGreg Kroah-Hartman { 462ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 463ab4382d2SGreg Kroah-Hartman 464ab4382d2SGreg Kroah-Hartman mod_timer(&sport->timer, jiffies); 465ab4382d2SGreg Kroah-Hartman } 466ab4382d2SGreg Kroah-Hartman 467ab4382d2SGreg Kroah-Hartman static inline void imx_transmit_buffer(struct imx_port *sport) 468ab4382d2SGreg Kroah-Hartman { 469ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &sport->port.state->xmit; 470ab4382d2SGreg Kroah-Hartman 4715e42e9a3SPeter Hurley if (sport->port.x_char) { 4725e42e9a3SPeter Hurley /* Send next char */ 4735e42e9a3SPeter Hurley writel(sport->port.x_char, sport->port.membase + URTX0); 4747e2fb5aaSJiada Wang sport->port.icount.tx++; 4757e2fb5aaSJiada Wang sport->port.x_char = 0; 4765e42e9a3SPeter Hurley return; 4775e42e9a3SPeter Hurley } 4785e42e9a3SPeter Hurley 4795e42e9a3SPeter Hurley if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { 4805e42e9a3SPeter Hurley imx_stop_tx(&sport->port); 4815e42e9a3SPeter Hurley return; 4825e42e9a3SPeter Hurley } 4835e42e9a3SPeter Hurley 484ab4382d2SGreg Kroah-Hartman while (!uart_circ_empty(xmit) && 4855e42e9a3SPeter Hurley !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) { 486ab4382d2SGreg Kroah-Hartman /* send xmit->buf[xmit->tail] 487ab4382d2SGreg Kroah-Hartman * out the port here */ 488ab4382d2SGreg Kroah-Hartman writel(xmit->buf[xmit->tail], sport->port.membase + URTX0); 489ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 490ab4382d2SGreg Kroah-Hartman sport->port.icount.tx++; 491ab4382d2SGreg Kroah-Hartman } 492ab4382d2SGreg Kroah-Hartman 493ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 494ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&sport->port); 495ab4382d2SGreg Kroah-Hartman 496ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 497ab4382d2SGreg Kroah-Hartman imx_stop_tx(&sport->port); 498ab4382d2SGreg Kroah-Hartman } 499ab4382d2SGreg Kroah-Hartman 5000bbc9b81SJiada Wang static void imx_dma_tx(struct imx_port *sport); 501b4cdc8f6SHuang Shijie static void dma_tx_callback(void *data) 502b4cdc8f6SHuang Shijie { 503b4cdc8f6SHuang Shijie struct imx_port *sport = data; 504b4cdc8f6SHuang Shijie struct scatterlist *sgl = &sport->tx_sgl[0]; 505b4cdc8f6SHuang Shijie struct circ_buf *xmit = &sport->port.state->xmit; 506b4cdc8f6SHuang Shijie unsigned long flags; 507a2c718ceSDirk Behme unsigned long temp; 508b4cdc8f6SHuang Shijie 50942f752b3SDirk Behme spin_lock_irqsave(&sport->port.lock, flags); 51042f752b3SDirk Behme 511b4cdc8f6SHuang Shijie dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); 512b4cdc8f6SHuang Shijie 513a2c718ceSDirk Behme temp = readl(sport->port.membase + UCR1); 514a2c718ceSDirk Behme temp &= ~UCR1_TDMAEN; 515a2c718ceSDirk Behme writel(temp, sport->port.membase + UCR1); 516a2c718ceSDirk Behme 51742f752b3SDirk Behme /* update the stat */ 51842f752b3SDirk Behme xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1); 51942f752b3SDirk Behme sport->port.icount.tx += sport->tx_bytes; 52042f752b3SDirk Behme 52142f752b3SDirk Behme dev_dbg(sport->port.dev, "we finish the TX DMA.\n"); 52242f752b3SDirk Behme 523b4cdc8f6SHuang Shijie sport->dma_is_txing = 0; 524b4cdc8f6SHuang Shijie 525b4cdc8f6SHuang Shijie spin_unlock_irqrestore(&sport->port.lock, flags); 526b4cdc8f6SHuang Shijie 527d64b8607SJiada Wang if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 528b4cdc8f6SHuang Shijie uart_write_wakeup(&sport->port); 5299ce4f8f3SGreg Kroah-Hartman 5309ce4f8f3SGreg Kroah-Hartman if (waitqueue_active(&sport->dma_wait)) { 5319ce4f8f3SGreg Kroah-Hartman wake_up(&sport->dma_wait); 5329ce4f8f3SGreg Kroah-Hartman dev_dbg(sport->port.dev, "exit in %s.\n", __func__); 5339ce4f8f3SGreg Kroah-Hartman return; 5349ce4f8f3SGreg Kroah-Hartman } 5350bbc9b81SJiada Wang 5360bbc9b81SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 5370bbc9b81SJiada Wang if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port)) 5380bbc9b81SJiada Wang imx_dma_tx(sport); 5390bbc9b81SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 540b4cdc8f6SHuang Shijie } 541b4cdc8f6SHuang Shijie 5427cb92fd2SHuang Shijie static void imx_dma_tx(struct imx_port *sport) 543b4cdc8f6SHuang Shijie { 544b4cdc8f6SHuang Shijie struct circ_buf *xmit = &sport->port.state->xmit; 545b4cdc8f6SHuang Shijie struct scatterlist *sgl = sport->tx_sgl; 546b4cdc8f6SHuang Shijie struct dma_async_tx_descriptor *desc; 547b4cdc8f6SHuang Shijie struct dma_chan *chan = sport->dma_chan_tx; 548b4cdc8f6SHuang Shijie struct device *dev = sport->port.dev; 549a2c718ceSDirk Behme unsigned long temp; 550b4cdc8f6SHuang Shijie int ret; 551b4cdc8f6SHuang Shijie 55242f752b3SDirk Behme if (sport->dma_is_txing) 553b4cdc8f6SHuang Shijie return; 554b4cdc8f6SHuang Shijie 555b4cdc8f6SHuang Shijie sport->tx_bytes = uart_circ_chars_pending(xmit); 556b4cdc8f6SHuang Shijie 5577942f857SDirk Behme if (xmit->tail < xmit->head) { 5587942f857SDirk Behme sport->dma_tx_nents = 1; 5597942f857SDirk Behme sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes); 5607942f857SDirk Behme } else { 561b4cdc8f6SHuang Shijie sport->dma_tx_nents = 2; 562b4cdc8f6SHuang Shijie sg_init_table(sgl, 2); 563b4cdc8f6SHuang Shijie sg_set_buf(sgl, xmit->buf + xmit->tail, 564b4cdc8f6SHuang Shijie UART_XMIT_SIZE - xmit->tail); 565b4cdc8f6SHuang Shijie sg_set_buf(sgl + 1, xmit->buf, xmit->head); 566b4cdc8f6SHuang Shijie } 567b4cdc8f6SHuang Shijie 568b4cdc8f6SHuang Shijie ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); 569b4cdc8f6SHuang Shijie if (ret == 0) { 570b4cdc8f6SHuang Shijie dev_err(dev, "DMA mapping error for TX.\n"); 571b4cdc8f6SHuang Shijie return; 572b4cdc8f6SHuang Shijie } 573b4cdc8f6SHuang Shijie desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, 574b4cdc8f6SHuang Shijie DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); 575b4cdc8f6SHuang Shijie if (!desc) { 57624649821SDirk Behme dma_unmap_sg(dev, sgl, sport->dma_tx_nents, 57724649821SDirk Behme DMA_TO_DEVICE); 578b4cdc8f6SHuang Shijie dev_err(dev, "We cannot prepare for the TX slave dma!\n"); 579b4cdc8f6SHuang Shijie return; 580b4cdc8f6SHuang Shijie } 581b4cdc8f6SHuang Shijie desc->callback = dma_tx_callback; 582b4cdc8f6SHuang Shijie desc->callback_param = sport; 583b4cdc8f6SHuang Shijie 584b4cdc8f6SHuang Shijie dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n", 585b4cdc8f6SHuang Shijie uart_circ_chars_pending(xmit)); 586a2c718ceSDirk Behme 587a2c718ceSDirk Behme temp = readl(sport->port.membase + UCR1); 588a2c718ceSDirk Behme temp |= UCR1_TDMAEN; 589a2c718ceSDirk Behme writel(temp, sport->port.membase + UCR1); 590a2c718ceSDirk Behme 591b4cdc8f6SHuang Shijie /* fire it */ 592b4cdc8f6SHuang Shijie sport->dma_is_txing = 1; 593b4cdc8f6SHuang Shijie dmaengine_submit(desc); 594b4cdc8f6SHuang Shijie dma_async_issue_pending(chan); 595b4cdc8f6SHuang Shijie return; 596b4cdc8f6SHuang Shijie } 597b4cdc8f6SHuang Shijie 598ab4382d2SGreg Kroah-Hartman /* 599ab4382d2SGreg Kroah-Hartman * interrupts disabled on entry 600ab4382d2SGreg Kroah-Hartman */ 601ab4382d2SGreg Kroah-Hartman static void imx_start_tx(struct uart_port *port) 602ab4382d2SGreg Kroah-Hartman { 603ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 604ab4382d2SGreg Kroah-Hartman unsigned long temp; 605ab4382d2SGreg Kroah-Hartman 606ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 607ab4382d2SGreg Kroah-Hartman /* half duplex in IrDA mode; have to disable receive mode */ 608ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 609ab4382d2SGreg Kroah-Hartman temp &= ~(UCR4_DREN); 610ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR4); 611ab4382d2SGreg Kroah-Hartman 612ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 613ab4382d2SGreg Kroah-Hartman temp &= ~(UCR1_RRDYEN); 614ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 615ab4382d2SGreg Kroah-Hartman } 616ab4382d2SGreg Kroah-Hartman 617b4cdc8f6SHuang Shijie if (!sport->dma_is_enabled) { 618ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 619ab4382d2SGreg Kroah-Hartman writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); 620b4cdc8f6SHuang Shijie } 621ab4382d2SGreg Kroah-Hartman 622ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 623ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 624ab4382d2SGreg Kroah-Hartman temp |= UCR1_TRDYEN; 625ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 626ab4382d2SGreg Kroah-Hartman 627ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 628ab4382d2SGreg Kroah-Hartman temp |= UCR4_TCEN; 629ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR4); 630ab4382d2SGreg Kroah-Hartman } 631ab4382d2SGreg Kroah-Hartman 632b4cdc8f6SHuang Shijie if (sport->dma_is_enabled) { 6335e42e9a3SPeter Hurley /* FIXME: port->x_char must be transmitted if != 0 */ 6345e42e9a3SPeter Hurley if (!uart_circ_empty(&port->state->xmit) && 6355e42e9a3SPeter Hurley !uart_tx_stopped(port)) 6367cb92fd2SHuang Shijie imx_dma_tx(sport); 637b4cdc8f6SHuang Shijie return; 638b4cdc8f6SHuang Shijie } 639ab4382d2SGreg Kroah-Hartman } 640ab4382d2SGreg Kroah-Hartman 641ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_rtsint(int irq, void *dev_id) 642ab4382d2SGreg Kroah-Hartman { 643ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 6445680e941SUwe Kleine-König unsigned int val; 645ab4382d2SGreg Kroah-Hartman unsigned long flags; 646ab4382d2SGreg Kroah-Hartman 647ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 648ab4382d2SGreg Kroah-Hartman 649ab4382d2SGreg Kroah-Hartman writel(USR1_RTSD, sport->port.membase + USR1); 6505680e941SUwe Kleine-König val = readl(sport->port.membase + USR1) & USR1_RTSS; 651ab4382d2SGreg Kroah-Hartman uart_handle_cts_change(&sport->port, !!val); 652ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&sport->port.state->port.delta_msr_wait); 653ab4382d2SGreg Kroah-Hartman 654ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 655ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 656ab4382d2SGreg Kroah-Hartman } 657ab4382d2SGreg Kroah-Hartman 658ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_txint(int irq, void *dev_id) 659ab4382d2SGreg Kroah-Hartman { 660ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 661ab4382d2SGreg Kroah-Hartman unsigned long flags; 662ab4382d2SGreg Kroah-Hartman 663ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 664ab4382d2SGreg Kroah-Hartman imx_transmit_buffer(sport); 665ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 666ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 667ab4382d2SGreg Kroah-Hartman } 668ab4382d2SGreg Kroah-Hartman 669ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_rxint(int irq, void *dev_id) 670ab4382d2SGreg Kroah-Hartman { 671ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 672ab4382d2SGreg Kroah-Hartman unsigned int rx, flg, ignored = 0; 67392a19f9cSJiri Slaby struct tty_port *port = &sport->port.state->port; 674ab4382d2SGreg Kroah-Hartman unsigned long flags, temp; 675ab4382d2SGreg Kroah-Hartman 676ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 677ab4382d2SGreg Kroah-Hartman 678ab4382d2SGreg Kroah-Hartman while (readl(sport->port.membase + USR2) & USR2_RDR) { 679ab4382d2SGreg Kroah-Hartman flg = TTY_NORMAL; 680ab4382d2SGreg Kroah-Hartman sport->port.icount.rx++; 681ab4382d2SGreg Kroah-Hartman 682ab4382d2SGreg Kroah-Hartman rx = readl(sport->port.membase + URXD0); 683ab4382d2SGreg Kroah-Hartman 684ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + USR2); 685ab4382d2SGreg Kroah-Hartman if (temp & USR2_BRCD) { 686ab4382d2SGreg Kroah-Hartman writel(USR2_BRCD, sport->port.membase + USR2); 687ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&sport->port)) 688ab4382d2SGreg Kroah-Hartman continue; 689ab4382d2SGreg Kroah-Hartman } 690ab4382d2SGreg Kroah-Hartman 691ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) 692ab4382d2SGreg Kroah-Hartman continue; 693ab4382d2SGreg Kroah-Hartman 694019dc9eaSHui Wang if (unlikely(rx & URXD_ERR)) { 695019dc9eaSHui Wang if (rx & URXD_BRK) 696019dc9eaSHui Wang sport->port.icount.brk++; 697019dc9eaSHui Wang else if (rx & URXD_PRERR) 698ab4382d2SGreg Kroah-Hartman sport->port.icount.parity++; 699ab4382d2SGreg Kroah-Hartman else if (rx & URXD_FRMERR) 700ab4382d2SGreg Kroah-Hartman sport->port.icount.frame++; 701ab4382d2SGreg Kroah-Hartman if (rx & URXD_OVRRUN) 702ab4382d2SGreg Kroah-Hartman sport->port.icount.overrun++; 703ab4382d2SGreg Kroah-Hartman 704ab4382d2SGreg Kroah-Hartman if (rx & sport->port.ignore_status_mask) { 705ab4382d2SGreg Kroah-Hartman if (++ignored > 100) 706ab4382d2SGreg Kroah-Hartman goto out; 707ab4382d2SGreg Kroah-Hartman continue; 708ab4382d2SGreg Kroah-Hartman } 709ab4382d2SGreg Kroah-Hartman 710ab4382d2SGreg Kroah-Hartman rx &= sport->port.read_status_mask; 711ab4382d2SGreg Kroah-Hartman 712019dc9eaSHui Wang if (rx & URXD_BRK) 713019dc9eaSHui Wang flg = TTY_BREAK; 714019dc9eaSHui Wang else if (rx & URXD_PRERR) 715ab4382d2SGreg Kroah-Hartman flg = TTY_PARITY; 716ab4382d2SGreg Kroah-Hartman else if (rx & URXD_FRMERR) 717ab4382d2SGreg Kroah-Hartman flg = TTY_FRAME; 718ab4382d2SGreg Kroah-Hartman if (rx & URXD_OVRRUN) 719ab4382d2SGreg Kroah-Hartman flg = TTY_OVERRUN; 720ab4382d2SGreg Kroah-Hartman 721ab4382d2SGreg Kroah-Hartman #ifdef SUPPORT_SYSRQ 722ab4382d2SGreg Kroah-Hartman sport->port.sysrq = 0; 723ab4382d2SGreg Kroah-Hartman #endif 724ab4382d2SGreg Kroah-Hartman } 725ab4382d2SGreg Kroah-Hartman 72655d8693aSJiada Wang if (sport->port.ignore_status_mask & URXD_DUMMY_READ) 72755d8693aSJiada Wang goto out; 72855d8693aSJiada Wang 72992a19f9cSJiri Slaby tty_insert_flip_char(port, rx, flg); 730ab4382d2SGreg Kroah-Hartman } 731ab4382d2SGreg Kroah-Hartman 732ab4382d2SGreg Kroah-Hartman out: 733ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 7342e124b4aSJiri Slaby tty_flip_buffer_push(port); 735ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 736ab4382d2SGreg Kroah-Hartman } 737ab4382d2SGreg Kroah-Hartman 7387cb92fd2SHuang Shijie static int start_rx_dma(struct imx_port *sport); 739b4cdc8f6SHuang Shijie /* 740b4cdc8f6SHuang Shijie * If the RXFIFO is filled with some data, and then we 741b4cdc8f6SHuang Shijie * arise a DMA operation to receive them. 742b4cdc8f6SHuang Shijie */ 743b4cdc8f6SHuang Shijie static void imx_dma_rxint(struct imx_port *sport) 744b4cdc8f6SHuang Shijie { 745b4cdc8f6SHuang Shijie unsigned long temp; 74673631813SJiada Wang unsigned long flags; 74773631813SJiada Wang 74873631813SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 749b4cdc8f6SHuang Shijie 750b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + USR2); 751b4cdc8f6SHuang Shijie if ((temp & USR2_RDR) && !sport->dma_is_rxing) { 752b4cdc8f6SHuang Shijie sport->dma_is_rxing = 1; 753b4cdc8f6SHuang Shijie 754b4cdc8f6SHuang Shijie /* disable the `Recerver Ready Interrrupt` */ 755b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 756b4cdc8f6SHuang Shijie temp &= ~(UCR1_RRDYEN); 757b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 758b4cdc8f6SHuang Shijie 759b4cdc8f6SHuang Shijie /* tell the DMA to receive the data. */ 7607cb92fd2SHuang Shijie start_rx_dma(sport); 761b4cdc8f6SHuang Shijie } 76273631813SJiada Wang 76373631813SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 764b4cdc8f6SHuang Shijie } 765b4cdc8f6SHuang Shijie 766ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_int(int irq, void *dev_id) 767ab4382d2SGreg Kroah-Hartman { 768ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 769ab4382d2SGreg Kroah-Hartman unsigned int sts; 770f1f836e4SAlexander Stein unsigned int sts2; 771ab4382d2SGreg Kroah-Hartman 772ab4382d2SGreg Kroah-Hartman sts = readl(sport->port.membase + USR1); 773ab4382d2SGreg Kroah-Hartman 774b4cdc8f6SHuang Shijie if (sts & USR1_RRDY) { 775b4cdc8f6SHuang Shijie if (sport->dma_is_enabled) 776b4cdc8f6SHuang Shijie imx_dma_rxint(sport); 777b4cdc8f6SHuang Shijie else 778ab4382d2SGreg Kroah-Hartman imx_rxint(irq, dev_id); 779b4cdc8f6SHuang Shijie } 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman if (sts & USR1_TRDY && 782ab4382d2SGreg Kroah-Hartman readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) 783ab4382d2SGreg Kroah-Hartman imx_txint(irq, dev_id); 784ab4382d2SGreg Kroah-Hartman 785ab4382d2SGreg Kroah-Hartman if (sts & USR1_RTSD) 786ab4382d2SGreg Kroah-Hartman imx_rtsint(irq, dev_id); 787ab4382d2SGreg Kroah-Hartman 788db1a9b55SFabio Estevam if (sts & USR1_AWAKE) 789db1a9b55SFabio Estevam writel(USR1_AWAKE, sport->port.membase + USR1); 790db1a9b55SFabio Estevam 791f1f836e4SAlexander Stein sts2 = readl(sport->port.membase + USR2); 792f1f836e4SAlexander Stein if (sts2 & USR2_ORE) { 793f1f836e4SAlexander Stein dev_err(sport->port.dev, "Rx FIFO overrun\n"); 794f1f836e4SAlexander Stein sport->port.icount.overrun++; 795f1f836e4SAlexander Stein writel(sts2 | USR2_ORE, sport->port.membase + USR2); 796f1f836e4SAlexander Stein } 797f1f836e4SAlexander Stein 798ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 799ab4382d2SGreg Kroah-Hartman } 800ab4382d2SGreg Kroah-Hartman 801ab4382d2SGreg Kroah-Hartman /* 802ab4382d2SGreg Kroah-Hartman * Return TIOCSER_TEMT when transmitter is not busy. 803ab4382d2SGreg Kroah-Hartman */ 804ab4382d2SGreg Kroah-Hartman static unsigned int imx_tx_empty(struct uart_port *port) 805ab4382d2SGreg Kroah-Hartman { 806ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 8071ce43e58SHuang Shijie unsigned int ret; 808ab4382d2SGreg Kroah-Hartman 8091ce43e58SHuang Shijie ret = (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0; 8101ce43e58SHuang Shijie 8111ce43e58SHuang Shijie /* If the TX DMA is working, return 0. */ 8121ce43e58SHuang Shijie if (sport->dma_is_enabled && sport->dma_is_txing) 8131ce43e58SHuang Shijie ret = 0; 8141ce43e58SHuang Shijie 8151ce43e58SHuang Shijie return ret; 816ab4382d2SGreg Kroah-Hartman } 817ab4382d2SGreg Kroah-Hartman 818ab4382d2SGreg Kroah-Hartman /* 819ab4382d2SGreg Kroah-Hartman * We have a modem side uart, so the meanings of RTS and CTS are inverted. 820ab4382d2SGreg Kroah-Hartman */ 821ab4382d2SGreg Kroah-Hartman static unsigned int imx_get_mctrl(struct uart_port *port) 822ab4382d2SGreg Kroah-Hartman { 823ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 824ab4382d2SGreg Kroah-Hartman unsigned int tmp = TIOCM_DSR | TIOCM_CAR; 825ab4382d2SGreg Kroah-Hartman 826ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + USR1) & USR1_RTSS) 827ab4382d2SGreg Kroah-Hartman tmp |= TIOCM_CTS; 828ab4382d2SGreg Kroah-Hartman 829ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + UCR2) & UCR2_CTS) 830ab4382d2SGreg Kroah-Hartman tmp |= TIOCM_RTS; 831ab4382d2SGreg Kroah-Hartman 8326b471a98SHuang Shijie if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP) 8336b471a98SHuang Shijie tmp |= TIOCM_LOOP; 8346b471a98SHuang Shijie 835ab4382d2SGreg Kroah-Hartman return tmp; 836ab4382d2SGreg Kroah-Hartman } 837ab4382d2SGreg Kroah-Hartman 838ab4382d2SGreg Kroah-Hartman static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) 839ab4382d2SGreg Kroah-Hartman { 840ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 841ab4382d2SGreg Kroah-Hartman unsigned long temp; 842ab4382d2SGreg Kroah-Hartman 843bb2f861aSFugang Duan temp = readl(sport->port.membase + UCR2) & ~(UCR2_CTS | UCR2_CTSC); 844ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 845bb2f861aSFugang Duan temp |= UCR2_CTS | UCR2_CTSC; 846ab4382d2SGreg Kroah-Hartman 847ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 8486b471a98SHuang Shijie 8496b471a98SHuang Shijie temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; 8506b471a98SHuang Shijie if (mctrl & TIOCM_LOOP) 8516b471a98SHuang Shijie temp |= UTS_LOOP; 8526b471a98SHuang Shijie writel(temp, sport->port.membase + uts_reg(sport)); 853ab4382d2SGreg Kroah-Hartman } 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman /* 856ab4382d2SGreg Kroah-Hartman * Interrupts always disabled. 857ab4382d2SGreg Kroah-Hartman */ 858ab4382d2SGreg Kroah-Hartman static void imx_break_ctl(struct uart_port *port, int break_state) 859ab4382d2SGreg Kroah-Hartman { 860ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 861ab4382d2SGreg Kroah-Hartman unsigned long flags, temp; 862ab4382d2SGreg Kroah-Hartman 863ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 864ab4382d2SGreg Kroah-Hartman 865ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK; 866ab4382d2SGreg Kroah-Hartman 867ab4382d2SGreg Kroah-Hartman if (break_state != 0) 868ab4382d2SGreg Kroah-Hartman temp |= UCR1_SNDBRK; 869ab4382d2SGreg Kroah-Hartman 870ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 871ab4382d2SGreg Kroah-Hartman 872ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 873ab4382d2SGreg Kroah-Hartman } 874ab4382d2SGreg Kroah-Hartman 875ab4382d2SGreg Kroah-Hartman #define TXTL 2 /* reset default */ 876ab4382d2SGreg Kroah-Hartman #define RXTL 1 /* reset default */ 877ab4382d2SGreg Kroah-Hartman 878ab4382d2SGreg Kroah-Hartman static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode) 879ab4382d2SGreg Kroah-Hartman { 880ab4382d2SGreg Kroah-Hartman unsigned int val; 881ab4382d2SGreg Kroah-Hartman 8827be0670fSDirk Behme /* set receiver / transmitter trigger level */ 8837be0670fSDirk Behme val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE); 8847be0670fSDirk Behme val |= TXTL << UFCR_TXTL_SHF | RXTL; 885ab4382d2SGreg Kroah-Hartman writel(val, sport->port.membase + UFCR); 886ab4382d2SGreg Kroah-Hartman return 0; 887ab4382d2SGreg Kroah-Hartman } 888ab4382d2SGreg Kroah-Hartman 889b4cdc8f6SHuang Shijie #define RX_BUF_SIZE (PAGE_SIZE) 890b4cdc8f6SHuang Shijie static void imx_rx_dma_done(struct imx_port *sport) 891b4cdc8f6SHuang Shijie { 892b4cdc8f6SHuang Shijie unsigned long temp; 89373631813SJiada Wang unsigned long flags; 89473631813SJiada Wang 89573631813SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 896b4cdc8f6SHuang Shijie 897b4cdc8f6SHuang Shijie /* Enable this interrupt when the RXFIFO is empty. */ 898b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 899b4cdc8f6SHuang Shijie temp |= UCR1_RRDYEN; 900b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 901b4cdc8f6SHuang Shijie 902b4cdc8f6SHuang Shijie sport->dma_is_rxing = 0; 9039ce4f8f3SGreg Kroah-Hartman 9049ce4f8f3SGreg Kroah-Hartman /* Is the shutdown waiting for us? */ 9059ce4f8f3SGreg Kroah-Hartman if (waitqueue_active(&sport->dma_wait)) 9069ce4f8f3SGreg Kroah-Hartman wake_up(&sport->dma_wait); 90773631813SJiada Wang 90873631813SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 909b4cdc8f6SHuang Shijie } 910b4cdc8f6SHuang Shijie 911b4cdc8f6SHuang Shijie /* 912b4cdc8f6SHuang Shijie * There are three kinds of RX DMA interrupts(such as in the MX6Q): 913b4cdc8f6SHuang Shijie * [1] the RX DMA buffer is full. 914b4cdc8f6SHuang Shijie * [2] the Aging timer expires(wait for 8 bytes long) 915b4cdc8f6SHuang Shijie * [3] the Idle Condition Detect(enabled the UCR4_IDDMAEN). 916b4cdc8f6SHuang Shijie * 917b4cdc8f6SHuang Shijie * The [2] is trigger when a character was been sitting in the FIFO 918b4cdc8f6SHuang Shijie * meanwhile [3] can wait for 32 bytes long when the RX line is 919b4cdc8f6SHuang Shijie * on IDLE state and RxFIFO is empty. 920b4cdc8f6SHuang Shijie */ 921b4cdc8f6SHuang Shijie static void dma_rx_callback(void *data) 922b4cdc8f6SHuang Shijie { 923b4cdc8f6SHuang Shijie struct imx_port *sport = data; 924b4cdc8f6SHuang Shijie struct dma_chan *chan = sport->dma_chan_rx; 925b4cdc8f6SHuang Shijie struct scatterlist *sgl = &sport->rx_sgl; 9267cb92fd2SHuang Shijie struct tty_port *port = &sport->port.state->port; 927b4cdc8f6SHuang Shijie struct dma_tx_state state; 928b4cdc8f6SHuang Shijie enum dma_status status; 929b4cdc8f6SHuang Shijie unsigned int count; 930b4cdc8f6SHuang Shijie 931b4cdc8f6SHuang Shijie /* unmap it first */ 932b4cdc8f6SHuang Shijie dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE); 933b4cdc8f6SHuang Shijie 934f0ef8834SHuang Shijie status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state); 935b4cdc8f6SHuang Shijie count = RX_BUF_SIZE - state.residue; 936b4cdc8f6SHuang Shijie dev_dbg(sport->port.dev, "We get %d bytes.\n", count); 937b4cdc8f6SHuang Shijie 938b4cdc8f6SHuang Shijie if (count) { 93955d8693aSJiada Wang if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) 9407cb92fd2SHuang Shijie tty_insert_flip_string(port, sport->rx_buf, count); 9417cb92fd2SHuang Shijie tty_flip_buffer_push(port); 9427cb92fd2SHuang Shijie 9437cb92fd2SHuang Shijie start_rx_dma(sport); 944ee5e7c10SRobin Gong } else if (readl(sport->port.membase + USR2) & USR2_RDR) { 945ee5e7c10SRobin Gong /* 946ee5e7c10SRobin Gong * start rx_dma directly once data in RXFIFO, more efficient 947ee5e7c10SRobin Gong * than before: 948ee5e7c10SRobin Gong * 1. call imx_rx_dma_done to stop dma if no data received 949ee5e7c10SRobin Gong * 2. wait next RDR interrupt to start dma transfer. 950ee5e7c10SRobin Gong */ 951ee5e7c10SRobin Gong start_rx_dma(sport); 952ee5e7c10SRobin Gong } else { 953ee5e7c10SRobin Gong /* 954ee5e7c10SRobin Gong * stop dma to prevent too many IDLE event trigged if no data 955ee5e7c10SRobin Gong * in RXFIFO 956ee5e7c10SRobin Gong */ 957b4cdc8f6SHuang Shijie imx_rx_dma_done(sport); 958b4cdc8f6SHuang Shijie } 959ee5e7c10SRobin Gong } 960b4cdc8f6SHuang Shijie 961b4cdc8f6SHuang Shijie static int start_rx_dma(struct imx_port *sport) 962b4cdc8f6SHuang Shijie { 963b4cdc8f6SHuang Shijie struct scatterlist *sgl = &sport->rx_sgl; 964b4cdc8f6SHuang Shijie struct dma_chan *chan = sport->dma_chan_rx; 965b4cdc8f6SHuang Shijie struct device *dev = sport->port.dev; 966b4cdc8f6SHuang Shijie struct dma_async_tx_descriptor *desc; 967b4cdc8f6SHuang Shijie int ret; 968b4cdc8f6SHuang Shijie 969b4cdc8f6SHuang Shijie sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE); 970b4cdc8f6SHuang Shijie ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE); 971b4cdc8f6SHuang Shijie if (ret == 0) { 972b4cdc8f6SHuang Shijie dev_err(dev, "DMA mapping error for RX.\n"); 973b4cdc8f6SHuang Shijie return -EINVAL; 974b4cdc8f6SHuang Shijie } 975b4cdc8f6SHuang Shijie desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM, 976b4cdc8f6SHuang Shijie DMA_PREP_INTERRUPT); 977b4cdc8f6SHuang Shijie if (!desc) { 97824649821SDirk Behme dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE); 979b4cdc8f6SHuang Shijie dev_err(dev, "We cannot prepare for the RX slave dma!\n"); 980b4cdc8f6SHuang Shijie return -EINVAL; 981b4cdc8f6SHuang Shijie } 982b4cdc8f6SHuang Shijie desc->callback = dma_rx_callback; 983b4cdc8f6SHuang Shijie desc->callback_param = sport; 984b4cdc8f6SHuang Shijie 985b4cdc8f6SHuang Shijie dev_dbg(dev, "RX: prepare for the DMA.\n"); 986b4cdc8f6SHuang Shijie dmaengine_submit(desc); 987b4cdc8f6SHuang Shijie dma_async_issue_pending(chan); 988b4cdc8f6SHuang Shijie return 0; 989b4cdc8f6SHuang Shijie } 990b4cdc8f6SHuang Shijie 991b4cdc8f6SHuang Shijie static void imx_uart_dma_exit(struct imx_port *sport) 992b4cdc8f6SHuang Shijie { 993b4cdc8f6SHuang Shijie if (sport->dma_chan_rx) { 994b4cdc8f6SHuang Shijie dma_release_channel(sport->dma_chan_rx); 995b4cdc8f6SHuang Shijie sport->dma_chan_rx = NULL; 996b4cdc8f6SHuang Shijie 997b4cdc8f6SHuang Shijie kfree(sport->rx_buf); 998b4cdc8f6SHuang Shijie sport->rx_buf = NULL; 999b4cdc8f6SHuang Shijie } 1000b4cdc8f6SHuang Shijie 1001b4cdc8f6SHuang Shijie if (sport->dma_chan_tx) { 1002b4cdc8f6SHuang Shijie dma_release_channel(sport->dma_chan_tx); 1003b4cdc8f6SHuang Shijie sport->dma_chan_tx = NULL; 1004b4cdc8f6SHuang Shijie } 1005b4cdc8f6SHuang Shijie 1006b4cdc8f6SHuang Shijie sport->dma_is_inited = 0; 1007b4cdc8f6SHuang Shijie } 1008b4cdc8f6SHuang Shijie 1009b4cdc8f6SHuang Shijie static int imx_uart_dma_init(struct imx_port *sport) 1010b4cdc8f6SHuang Shijie { 1011b09c74aeSHuang Shijie struct dma_slave_config slave_config = {}; 1012b4cdc8f6SHuang Shijie struct device *dev = sport->port.dev; 1013b4cdc8f6SHuang Shijie int ret; 1014b4cdc8f6SHuang Shijie 1015b4cdc8f6SHuang Shijie /* Prepare for RX : */ 1016b4cdc8f6SHuang Shijie sport->dma_chan_rx = dma_request_slave_channel(dev, "rx"); 1017b4cdc8f6SHuang Shijie if (!sport->dma_chan_rx) { 1018b4cdc8f6SHuang Shijie dev_dbg(dev, "cannot get the DMA channel.\n"); 1019b4cdc8f6SHuang Shijie ret = -EINVAL; 1020b4cdc8f6SHuang Shijie goto err; 1021b4cdc8f6SHuang Shijie } 1022b4cdc8f6SHuang Shijie 1023b4cdc8f6SHuang Shijie slave_config.direction = DMA_DEV_TO_MEM; 1024b4cdc8f6SHuang Shijie slave_config.src_addr = sport->port.mapbase + URXD0; 1025b4cdc8f6SHuang Shijie slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 1026b4cdc8f6SHuang Shijie slave_config.src_maxburst = RXTL; 1027b4cdc8f6SHuang Shijie ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config); 1028b4cdc8f6SHuang Shijie if (ret) { 1029b4cdc8f6SHuang Shijie dev_err(dev, "error in RX dma configuration.\n"); 1030b4cdc8f6SHuang Shijie goto err; 1031b4cdc8f6SHuang Shijie } 1032b4cdc8f6SHuang Shijie 1033b4cdc8f6SHuang Shijie sport->rx_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); 1034b4cdc8f6SHuang Shijie if (!sport->rx_buf) { 1035b4cdc8f6SHuang Shijie ret = -ENOMEM; 1036b4cdc8f6SHuang Shijie goto err; 1037b4cdc8f6SHuang Shijie } 1038b4cdc8f6SHuang Shijie 1039b4cdc8f6SHuang Shijie /* Prepare for TX : */ 1040b4cdc8f6SHuang Shijie sport->dma_chan_tx = dma_request_slave_channel(dev, "tx"); 1041b4cdc8f6SHuang Shijie if (!sport->dma_chan_tx) { 1042b4cdc8f6SHuang Shijie dev_err(dev, "cannot get the TX DMA channel!\n"); 1043b4cdc8f6SHuang Shijie ret = -EINVAL; 1044b4cdc8f6SHuang Shijie goto err; 1045b4cdc8f6SHuang Shijie } 1046b4cdc8f6SHuang Shijie 1047b4cdc8f6SHuang Shijie slave_config.direction = DMA_MEM_TO_DEV; 1048b4cdc8f6SHuang Shijie slave_config.dst_addr = sport->port.mapbase + URTX0; 1049b4cdc8f6SHuang Shijie slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 1050b4cdc8f6SHuang Shijie slave_config.dst_maxburst = TXTL; 1051b4cdc8f6SHuang Shijie ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config); 1052b4cdc8f6SHuang Shijie if (ret) { 1053b4cdc8f6SHuang Shijie dev_err(dev, "error in TX dma configuration."); 1054b4cdc8f6SHuang Shijie goto err; 1055b4cdc8f6SHuang Shijie } 1056b4cdc8f6SHuang Shijie 1057b4cdc8f6SHuang Shijie sport->dma_is_inited = 1; 1058b4cdc8f6SHuang Shijie 1059b4cdc8f6SHuang Shijie return 0; 1060b4cdc8f6SHuang Shijie err: 1061b4cdc8f6SHuang Shijie imx_uart_dma_exit(sport); 1062b4cdc8f6SHuang Shijie return ret; 1063b4cdc8f6SHuang Shijie } 1064b4cdc8f6SHuang Shijie 1065b4cdc8f6SHuang Shijie static void imx_enable_dma(struct imx_port *sport) 1066b4cdc8f6SHuang Shijie { 1067b4cdc8f6SHuang Shijie unsigned long temp; 1068b4cdc8f6SHuang Shijie 10699ce4f8f3SGreg Kroah-Hartman init_waitqueue_head(&sport->dma_wait); 10709ce4f8f3SGreg Kroah-Hartman 1071b4cdc8f6SHuang Shijie /* set UCR1 */ 1072b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 1073b4cdc8f6SHuang Shijie temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN | 1074b4cdc8f6SHuang Shijie /* wait for 32 idle frames for IDDMA interrupt */ 1075b4cdc8f6SHuang Shijie UCR1_ICD_REG(3); 1076b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 1077b4cdc8f6SHuang Shijie 1078b4cdc8f6SHuang Shijie /* set UCR4 */ 1079b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR4); 1080b4cdc8f6SHuang Shijie temp |= UCR4_IDDMAEN; 1081b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR4); 1082b4cdc8f6SHuang Shijie 1083b4cdc8f6SHuang Shijie sport->dma_is_enabled = 1; 1084b4cdc8f6SHuang Shijie } 1085b4cdc8f6SHuang Shijie 1086b4cdc8f6SHuang Shijie static void imx_disable_dma(struct imx_port *sport) 1087b4cdc8f6SHuang Shijie { 1088b4cdc8f6SHuang Shijie unsigned long temp; 1089b4cdc8f6SHuang Shijie 1090b4cdc8f6SHuang Shijie /* clear UCR1 */ 1091b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 1092b4cdc8f6SHuang Shijie temp &= ~(UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN); 1093b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 1094b4cdc8f6SHuang Shijie 1095b4cdc8f6SHuang Shijie /* clear UCR2 */ 1096b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR2); 1097b4cdc8f6SHuang Shijie temp &= ~(UCR2_CTSC | UCR2_CTS); 1098b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR2); 1099b4cdc8f6SHuang Shijie 1100b4cdc8f6SHuang Shijie /* clear UCR4 */ 1101b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR4); 1102b4cdc8f6SHuang Shijie temp &= ~UCR4_IDDMAEN; 1103b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR4); 1104b4cdc8f6SHuang Shijie 1105b4cdc8f6SHuang Shijie sport->dma_is_enabled = 0; 1106b4cdc8f6SHuang Shijie } 1107b4cdc8f6SHuang Shijie 1108ab4382d2SGreg Kroah-Hartman /* half the RX buffer size */ 1109ab4382d2SGreg Kroah-Hartman #define CTSTL 16 1110ab4382d2SGreg Kroah-Hartman 1111ab4382d2SGreg Kroah-Hartman static int imx_startup(struct uart_port *port) 1112ab4382d2SGreg Kroah-Hartman { 1113ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1114772f8991SHuang Shijie int retval, i; 1115ab4382d2SGreg Kroah-Hartman unsigned long flags, temp; 1116ab4382d2SGreg Kroah-Hartman 111728eb4274SHuang Shijie retval = clk_prepare_enable(sport->clk_per); 111828eb4274SHuang Shijie if (retval) 1119cb0f0a5fSFabio Estevam return retval; 112028eb4274SHuang Shijie retval = clk_prepare_enable(sport->clk_ipg); 11210c375501SHuang Shijie if (retval) { 11220c375501SHuang Shijie clk_disable_unprepare(sport->clk_per); 1123cb0f0a5fSFabio Estevam return retval; 11240c375501SHuang Shijie } 112528eb4274SHuang Shijie 1126ab4382d2SGreg Kroah-Hartman imx_setup_ufcr(sport, 0); 1127ab4382d2SGreg Kroah-Hartman 1128ab4382d2SGreg Kroah-Hartman /* disable the DREN bit (Data Ready interrupt enable) before 1129ab4382d2SGreg Kroah-Hartman * requesting IRQs 1130ab4382d2SGreg Kroah-Hartman */ 1131ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 1132ab4382d2SGreg Kroah-Hartman 1133ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) 1134ab4382d2SGreg Kroah-Hartman temp |= UCR4_IRSC; 1135ab4382d2SGreg Kroah-Hartman 1136ab4382d2SGreg Kroah-Hartman /* set the trigger level for CTS */ 1137ab4382d2SGreg Kroah-Hartman temp &= ~(UCR4_CTSTL_MASK << UCR4_CTSTL_SHF); 1138ab4382d2SGreg Kroah-Hartman temp |= CTSTL << UCR4_CTSTL_SHF; 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); 1141ab4382d2SGreg Kroah-Hartman 1142772f8991SHuang Shijie /* Reset fifo's and state machines */ 1143772f8991SHuang Shijie i = 100; 1144772f8991SHuang Shijie 1145ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 1146ab4382d2SGreg Kroah-Hartman temp &= ~UCR2_SRST; 1147ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 1148772f8991SHuang Shijie 1149772f8991SHuang Shijie while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) 1150ab4382d2SGreg Kroah-Hartman udelay(1); 1151ab4382d2SGreg Kroah-Hartman 1152068500e0SAnton Bondarenko /* Can we enable the DMA support? */ 1153068500e0SAnton Bondarenko if (is_imx6q_uart(sport) && !uart_console(port) && 1154068500e0SAnton Bondarenko !sport->dma_is_inited) 1155068500e0SAnton Bondarenko imx_uart_dma_init(sport); 1156068500e0SAnton Bondarenko 11579ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1158ab4382d2SGreg Kroah-Hartman /* 1159ab4382d2SGreg Kroah-Hartman * Finally, clear and enable interrupts 1160ab4382d2SGreg Kroah-Hartman */ 1161ab4382d2SGreg Kroah-Hartman writel(USR1_RTSD, sport->port.membase + USR1); 1162ab4382d2SGreg Kroah-Hartman 1163068500e0SAnton Bondarenko if (sport->dma_is_inited && !sport->dma_is_enabled) 1164068500e0SAnton Bondarenko imx_enable_dma(sport); 1165068500e0SAnton Bondarenko 1166ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 1167ab4382d2SGreg Kroah-Hartman temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; 1168ab4382d2SGreg Kroah-Hartman 1169ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 1170ab4382d2SGreg Kroah-Hartman temp |= UCR1_IREN; 1171ab4382d2SGreg Kroah-Hartman temp &= ~(UCR1_RTSDEN); 1172ab4382d2SGreg Kroah-Hartman } 1173ab4382d2SGreg Kroah-Hartman 1174ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 1175ab4382d2SGreg Kroah-Hartman 11766f026d6bSJiada Wang /* Clear any pending ORE flag before enabling interrupt */ 11776f026d6bSJiada Wang temp = readl(sport->port.membase + USR2); 11786f026d6bSJiada Wang writel(temp | USR2_ORE, sport->port.membase + USR2); 11796f026d6bSJiada Wang 11806f026d6bSJiada Wang temp = readl(sport->port.membase + UCR4); 11816f026d6bSJiada Wang temp |= UCR4_OREN; 11826f026d6bSJiada Wang writel(temp, sport->port.membase + UCR4); 11836f026d6bSJiada Wang 1184ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 1185ab4382d2SGreg Kroah-Hartman temp |= (UCR2_RXEN | UCR2_TXEN); 1186bff09b09SLucas Stach if (!sport->have_rtscts) 1187bff09b09SLucas Stach temp |= UCR2_IRTS; 1188ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 1189ab4382d2SGreg Kroah-Hartman 1190a496e628SHuang Shijie if (!is_imx1_uart(sport)) { 1191ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR3); 1192b38cb7d2SFabio Estevam temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP; 1193ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR3); 1194ab4382d2SGreg Kroah-Hartman } 1195ab4382d2SGreg Kroah-Hartman 1196ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 1197ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 1198ab4382d2SGreg Kroah-Hartman if (sport->irda_inv_rx) 1199ab4382d2SGreg Kroah-Hartman temp |= UCR4_INVR; 1200ab4382d2SGreg Kroah-Hartman else 1201ab4382d2SGreg Kroah-Hartman temp &= ~(UCR4_INVR); 1202ab4382d2SGreg Kroah-Hartman writel(temp | UCR4_DREN, sport->port.membase + UCR4); 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR3); 1205ab4382d2SGreg Kroah-Hartman if (sport->irda_inv_tx) 1206ab4382d2SGreg Kroah-Hartman temp |= UCR3_INVT; 1207ab4382d2SGreg Kroah-Hartman else 1208ab4382d2SGreg Kroah-Hartman temp &= ~(UCR3_INVT); 1209ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR3); 1210ab4382d2SGreg Kroah-Hartman } 1211ab4382d2SGreg Kroah-Hartman 1212ab4382d2SGreg Kroah-Hartman /* 1213ab4382d2SGreg Kroah-Hartman * Enable modem status interrupts 1214ab4382d2SGreg Kroah-Hartman */ 1215ab4382d2SGreg Kroah-Hartman imx_enable_ms(&sport->port); 1216ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 1219ab4382d2SGreg Kroah-Hartman struct imxuart_platform_data *pdata; 1220574de559SJingoo Han pdata = dev_get_platdata(sport->port.dev); 1221ab4382d2SGreg Kroah-Hartman sport->irda_inv_rx = pdata->irda_inv_rx; 1222ab4382d2SGreg Kroah-Hartman sport->irda_inv_tx = pdata->irda_inv_tx; 1223ab4382d2SGreg Kroah-Hartman sport->trcv_delay = pdata->transceiver_delay; 1224ab4382d2SGreg Kroah-Hartman if (pdata->irda_enable) 1225ab4382d2SGreg Kroah-Hartman pdata->irda_enable(1); 1226ab4382d2SGreg Kroah-Hartman } 1227ab4382d2SGreg Kroah-Hartman 1228ab4382d2SGreg Kroah-Hartman return 0; 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman static void imx_shutdown(struct uart_port *port) 1232ab4382d2SGreg Kroah-Hartman { 1233ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1234ab4382d2SGreg Kroah-Hartman unsigned long temp; 12359ec1882dSXinyu Chen unsigned long flags; 1236ab4382d2SGreg Kroah-Hartman 1237b4cdc8f6SHuang Shijie if (sport->dma_is_enabled) { 1238a4688bcdSHuang Shijie int ret; 1239a4688bcdSHuang Shijie 12409ce4f8f3SGreg Kroah-Hartman /* We have to wait for the DMA to finish. */ 1241a4688bcdSHuang Shijie ret = wait_event_interruptible(sport->dma_wait, 12429ce4f8f3SGreg Kroah-Hartman !sport->dma_is_rxing && !sport->dma_is_txing); 1243a4688bcdSHuang Shijie if (ret != 0) { 1244a4688bcdSHuang Shijie sport->dma_is_rxing = 0; 1245a4688bcdSHuang Shijie sport->dma_is_txing = 0; 1246a4688bcdSHuang Shijie dmaengine_terminate_all(sport->dma_chan_tx); 1247a4688bcdSHuang Shijie dmaengine_terminate_all(sport->dma_chan_rx); 1248a4688bcdSHuang Shijie } 124973631813SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 1250a4688bcdSHuang Shijie imx_stop_tx(port); 1251b4cdc8f6SHuang Shijie imx_stop_rx(port); 1252b4cdc8f6SHuang Shijie imx_disable_dma(sport); 125373631813SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 1254b4cdc8f6SHuang Shijie imx_uart_dma_exit(sport); 1255b4cdc8f6SHuang Shijie } 1256b4cdc8f6SHuang Shijie 12579ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1258ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 1259ab4382d2SGreg Kroah-Hartman temp &= ~(UCR2_TXEN); 1260ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 12619ec1882dSXinyu Chen spin_unlock_irqrestore(&sport->port.lock, flags); 1262ab4382d2SGreg Kroah-Hartman 1263ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 1264ab4382d2SGreg Kroah-Hartman struct imxuart_platform_data *pdata; 1265574de559SJingoo Han pdata = dev_get_platdata(sport->port.dev); 1266ab4382d2SGreg Kroah-Hartman if (pdata->irda_enable) 1267ab4382d2SGreg Kroah-Hartman pdata->irda_enable(0); 1268ab4382d2SGreg Kroah-Hartman } 1269ab4382d2SGreg Kroah-Hartman 1270ab4382d2SGreg Kroah-Hartman /* 1271ab4382d2SGreg Kroah-Hartman * Stop our timer. 1272ab4382d2SGreg Kroah-Hartman */ 1273ab4382d2SGreg Kroah-Hartman del_timer_sync(&sport->timer); 1274ab4382d2SGreg Kroah-Hartman 1275ab4382d2SGreg Kroah-Hartman /* 1276ab4382d2SGreg Kroah-Hartman * Disable all interrupts, port and break condition. 1277ab4382d2SGreg Kroah-Hartman */ 1278ab4382d2SGreg Kroah-Hartman 12799ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1280ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 1281ab4382d2SGreg Kroah-Hartman temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN); 1282ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) 1283ab4382d2SGreg Kroah-Hartman temp &= ~(UCR1_IREN); 1284ab4382d2SGreg Kroah-Hartman 1285ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 12869ec1882dSXinyu Chen spin_unlock_irqrestore(&sport->port.lock, flags); 128728eb4274SHuang Shijie 128828eb4274SHuang Shijie clk_disable_unprepare(sport->clk_per); 128928eb4274SHuang Shijie clk_disable_unprepare(sport->clk_ipg); 1290ab4382d2SGreg Kroah-Hartman } 1291ab4382d2SGreg Kroah-Hartman 1292eb56b7edSHuang Shijie static void imx_flush_buffer(struct uart_port *port) 1293eb56b7edSHuang Shijie { 1294eb56b7edSHuang Shijie struct imx_port *sport = (struct imx_port *)port; 129582e86ae9SDirk Behme struct scatterlist *sgl = &sport->tx_sgl[0]; 1296a2c718ceSDirk Behme unsigned long temp; 1297eb56b7edSHuang Shijie 129882e86ae9SDirk Behme if (!sport->dma_chan_tx) 129982e86ae9SDirk Behme return; 130082e86ae9SDirk Behme 1301eb56b7edSHuang Shijie sport->tx_bytes = 0; 1302eb56b7edSHuang Shijie dmaengine_terminate_all(sport->dma_chan_tx); 130382e86ae9SDirk Behme if (sport->dma_is_txing) { 130482e86ae9SDirk Behme dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, 130582e86ae9SDirk Behme DMA_TO_DEVICE); 1306a2c718ceSDirk Behme temp = readl(sport->port.membase + UCR1); 1307a2c718ceSDirk Behme temp &= ~UCR1_TDMAEN; 1308a2c718ceSDirk Behme writel(temp, sport->port.membase + UCR1); 130982e86ae9SDirk Behme sport->dma_is_txing = false; 1310eb56b7edSHuang Shijie } 1311eb56b7edSHuang Shijie } 1312eb56b7edSHuang Shijie 1313ab4382d2SGreg Kroah-Hartman static void 1314ab4382d2SGreg Kroah-Hartman imx_set_termios(struct uart_port *port, struct ktermios *termios, 1315ab4382d2SGreg Kroah-Hartman struct ktermios *old) 1316ab4382d2SGreg Kroah-Hartman { 1317ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1318ab4382d2SGreg Kroah-Hartman unsigned long flags; 1319ab4382d2SGreg Kroah-Hartman unsigned int ucr2, old_ucr1, old_txrxen, baud, quot; 1320ab4382d2SGreg Kroah-Hartman unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; 1321ab4382d2SGreg Kroah-Hartman unsigned int div, ufcr; 1322ab4382d2SGreg Kroah-Hartman unsigned long num, denom; 1323ab4382d2SGreg Kroah-Hartman uint64_t tdiv64; 1324ab4382d2SGreg Kroah-Hartman 1325ab4382d2SGreg Kroah-Hartman /* 1326ab4382d2SGreg Kroah-Hartman * If we don't support modem control lines, don't allow 1327ab4382d2SGreg Kroah-Hartman * these to be set. 1328ab4382d2SGreg Kroah-Hartman */ 1329ab4382d2SGreg Kroah-Hartman if (0) { 1330ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR); 1331ab4382d2SGreg Kroah-Hartman termios->c_cflag |= CLOCAL; 1332ab4382d2SGreg Kroah-Hartman } 1333ab4382d2SGreg Kroah-Hartman 1334ab4382d2SGreg Kroah-Hartman /* 1335ab4382d2SGreg Kroah-Hartman * We only support CS7 and CS8. 1336ab4382d2SGreg Kroah-Hartman */ 1337ab4382d2SGreg Kroah-Hartman while ((termios->c_cflag & CSIZE) != CS7 && 1338ab4382d2SGreg Kroah-Hartman (termios->c_cflag & CSIZE) != CS8) { 1339ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CSIZE; 1340ab4382d2SGreg Kroah-Hartman termios->c_cflag |= old_csize; 1341ab4382d2SGreg Kroah-Hartman old_csize = CS8; 1342ab4382d2SGreg Kroah-Hartman } 1343ab4382d2SGreg Kroah-Hartman 1344ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CSIZE) == CS8) 1345ab4382d2SGreg Kroah-Hartman ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS; 1346ab4382d2SGreg Kroah-Hartman else 1347ab4382d2SGreg Kroah-Hartman ucr2 = UCR2_SRST | UCR2_IRTS; 1348ab4382d2SGreg Kroah-Hartman 1349ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 1350ab4382d2SGreg Kroah-Hartman if (sport->have_rtscts) { 1351ab4382d2SGreg Kroah-Hartman ucr2 &= ~UCR2_IRTS; 1352ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_CTSC; 1353ab4382d2SGreg Kroah-Hartman } else { 1354ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CRTSCTS; 1355ab4382d2SGreg Kroah-Hartman } 1356ab4382d2SGreg Kroah-Hartman } 1357ab4382d2SGreg Kroah-Hartman 1358ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 1359ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_STPB; 1360ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) { 1361ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_PREN; 1362ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARODD) 1363ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_PROE; 1364ab4382d2SGreg Kroah-Hartman } 1365ab4382d2SGreg Kroah-Hartman 1366995234daSEric Miao del_timer_sync(&sport->timer); 1367995234daSEric Miao 1368ab4382d2SGreg Kroah-Hartman /* 1369ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 1370ab4382d2SGreg Kroah-Hartman */ 1371ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); 1372ab4382d2SGreg Kroah-Hartman quot = uart_get_divisor(port, baud); 1373ab4382d2SGreg Kroah-Hartman 1374ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 1375ab4382d2SGreg Kroah-Hartman 1376ab4382d2SGreg Kroah-Hartman sport->port.read_status_mask = 0; 1377ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 1378ab4382d2SGreg Kroah-Hartman sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR); 1379ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 1380ab4382d2SGreg Kroah-Hartman sport->port.read_status_mask |= URXD_BRK; 1381ab4382d2SGreg Kroah-Hartman 1382ab4382d2SGreg Kroah-Hartman /* 1383ab4382d2SGreg Kroah-Hartman * Characters to ignore 1384ab4382d2SGreg Kroah-Hartman */ 1385ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask = 0; 1386ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 1387ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask |= URXD_PRERR; 1388ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 1389ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask |= URXD_BRK; 1390ab4382d2SGreg Kroah-Hartman /* 1391ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 1392ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 1393ab4382d2SGreg Kroah-Hartman */ 1394ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 1395ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask |= URXD_OVRRUN; 1396ab4382d2SGreg Kroah-Hartman } 1397ab4382d2SGreg Kroah-Hartman 139855d8693aSJiada Wang if ((termios->c_cflag & CREAD) == 0) 139955d8693aSJiada Wang sport->port.ignore_status_mask |= URXD_DUMMY_READ; 140055d8693aSJiada Wang 1401ab4382d2SGreg Kroah-Hartman /* 1402ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 1403ab4382d2SGreg Kroah-Hartman */ 1404ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 1405ab4382d2SGreg Kroah-Hartman 1406ab4382d2SGreg Kroah-Hartman /* 1407ab4382d2SGreg Kroah-Hartman * disable interrupts and drain transmitter 1408ab4382d2SGreg Kroah-Hartman */ 1409ab4382d2SGreg Kroah-Hartman old_ucr1 = readl(sport->port.membase + UCR1); 1410ab4382d2SGreg Kroah-Hartman writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN), 1411ab4382d2SGreg Kroah-Hartman sport->port.membase + UCR1); 1412ab4382d2SGreg Kroah-Hartman 1413ab4382d2SGreg Kroah-Hartman while (!(readl(sport->port.membase + USR2) & USR2_TXDC)) 1414ab4382d2SGreg Kroah-Hartman barrier(); 1415ab4382d2SGreg Kroah-Hartman 1416ab4382d2SGreg Kroah-Hartman /* then, disable everything */ 1417ab4382d2SGreg Kroah-Hartman old_txrxen = readl(sport->port.membase + UCR2); 1418ab4382d2SGreg Kroah-Hartman writel(old_txrxen & ~(UCR2_TXEN | UCR2_RXEN), 1419ab4382d2SGreg Kroah-Hartman sport->port.membase + UCR2); 1420ab4382d2SGreg Kroah-Hartman old_txrxen &= (UCR2_TXEN | UCR2_RXEN); 1421ab4382d2SGreg Kroah-Hartman 1422ab4382d2SGreg Kroah-Hartman if (USE_IRDA(sport)) { 1423ab4382d2SGreg Kroah-Hartman /* 1424ab4382d2SGreg Kroah-Hartman * use maximum available submodule frequency to 1425ab4382d2SGreg Kroah-Hartman * avoid missing short pulses due to low sampling rate 1426ab4382d2SGreg Kroah-Hartman */ 1427ab4382d2SGreg Kroah-Hartman div = 1; 1428ab4382d2SGreg Kroah-Hartman } else { 142909bd00f6SHubert Feurstein /* custom-baudrate handling */ 143009bd00f6SHubert Feurstein div = sport->port.uartclk / (baud * 16); 143109bd00f6SHubert Feurstein if (baud == 38400 && quot != div) 143209bd00f6SHubert Feurstein baud = sport->port.uartclk / (quot * 16); 143309bd00f6SHubert Feurstein 1434ab4382d2SGreg Kroah-Hartman div = sport->port.uartclk / (baud * 16); 1435ab4382d2SGreg Kroah-Hartman if (div > 7) 1436ab4382d2SGreg Kroah-Hartman div = 7; 1437ab4382d2SGreg Kroah-Hartman if (!div) 1438ab4382d2SGreg Kroah-Hartman div = 1; 1439ab4382d2SGreg Kroah-Hartman } 1440ab4382d2SGreg Kroah-Hartman 1441ab4382d2SGreg Kroah-Hartman rational_best_approximation(16 * div * baud, sport->port.uartclk, 1442ab4382d2SGreg Kroah-Hartman 1 << 16, 1 << 16, &num, &denom); 1443ab4382d2SGreg Kroah-Hartman 1444ab4382d2SGreg Kroah-Hartman tdiv64 = sport->port.uartclk; 1445ab4382d2SGreg Kroah-Hartman tdiv64 *= num; 1446ab4382d2SGreg Kroah-Hartman do_div(tdiv64, denom * 16 * div); 1447ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 1448ab4382d2SGreg Kroah-Hartman (speed_t)tdiv64, (speed_t)tdiv64); 1449ab4382d2SGreg Kroah-Hartman 1450ab4382d2SGreg Kroah-Hartman num -= 1; 1451ab4382d2SGreg Kroah-Hartman denom -= 1; 1452ab4382d2SGreg Kroah-Hartman 1453ab4382d2SGreg Kroah-Hartman ufcr = readl(sport->port.membase + UFCR); 1454ab4382d2SGreg Kroah-Hartman ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div); 145520ff2fe6SHuang Shijie if (sport->dte_mode) 145620ff2fe6SHuang Shijie ufcr |= UFCR_DCEDTE; 1457ab4382d2SGreg Kroah-Hartman writel(ufcr, sport->port.membase + UFCR); 1458ab4382d2SGreg Kroah-Hartman 1459ab4382d2SGreg Kroah-Hartman writel(num, sport->port.membase + UBIR); 1460ab4382d2SGreg Kroah-Hartman writel(denom, sport->port.membase + UBMR); 1461ab4382d2SGreg Kroah-Hartman 1462a496e628SHuang Shijie if (!is_imx1_uart(sport)) 1463ab4382d2SGreg Kroah-Hartman writel(sport->port.uartclk / div / 1000, 1464fe6b540aSShawn Guo sport->port.membase + IMX21_ONEMS); 1465ab4382d2SGreg Kroah-Hartman 1466ab4382d2SGreg Kroah-Hartman writel(old_ucr1, sport->port.membase + UCR1); 1467ab4382d2SGreg Kroah-Hartman 1468ab4382d2SGreg Kroah-Hartman /* set the parity, stop bits and data size */ 1469ab4382d2SGreg Kroah-Hartman writel(ucr2 | old_txrxen, sport->port.membase + UCR2); 1470ab4382d2SGreg Kroah-Hartman 1471ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) 1472ab4382d2SGreg Kroah-Hartman imx_enable_ms(&sport->port); 1473ab4382d2SGreg Kroah-Hartman 1474ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 1475ab4382d2SGreg Kroah-Hartman } 1476ab4382d2SGreg Kroah-Hartman 1477ab4382d2SGreg Kroah-Hartman static const char *imx_type(struct uart_port *port) 1478ab4382d2SGreg Kroah-Hartman { 1479ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1480ab4382d2SGreg Kroah-Hartman 1481ab4382d2SGreg Kroah-Hartman return sport->port.type == PORT_IMX ? "IMX" : NULL; 1482ab4382d2SGreg Kroah-Hartman } 1483ab4382d2SGreg Kroah-Hartman 1484ab4382d2SGreg Kroah-Hartman /* 1485ab4382d2SGreg Kroah-Hartman * Configure/autoconfigure the port. 1486ab4382d2SGreg Kroah-Hartman */ 1487ab4382d2SGreg Kroah-Hartman static void imx_config_port(struct uart_port *port, int flags) 1488ab4382d2SGreg Kroah-Hartman { 1489ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1490ab4382d2SGreg Kroah-Hartman 1491da82f997SAlexander Shiyan if (flags & UART_CONFIG_TYPE) 1492ab4382d2SGreg Kroah-Hartman sport->port.type = PORT_IMX; 1493ab4382d2SGreg Kroah-Hartman } 1494ab4382d2SGreg Kroah-Hartman 1495ab4382d2SGreg Kroah-Hartman /* 1496ab4382d2SGreg Kroah-Hartman * Verify the new serial_struct (for TIOCSSERIAL). 1497ab4382d2SGreg Kroah-Hartman * The only change we allow are to the flags and type, and 1498ab4382d2SGreg Kroah-Hartman * even then only between PORT_IMX and PORT_UNKNOWN 1499ab4382d2SGreg Kroah-Hartman */ 1500ab4382d2SGreg Kroah-Hartman static int 1501ab4382d2SGreg Kroah-Hartman imx_verify_port(struct uart_port *port, struct serial_struct *ser) 1502ab4382d2SGreg Kroah-Hartman { 1503ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1504ab4382d2SGreg Kroah-Hartman int ret = 0; 1505ab4382d2SGreg Kroah-Hartman 1506ab4382d2SGreg Kroah-Hartman if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX) 1507ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1508ab4382d2SGreg Kroah-Hartman if (sport->port.irq != ser->irq) 1509ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1510ab4382d2SGreg Kroah-Hartman if (ser->io_type != UPIO_MEM) 1511ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1512ab4382d2SGreg Kroah-Hartman if (sport->port.uartclk / 16 != ser->baud_base) 1513ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1514a50c44ceSOlof Johansson if (sport->port.mapbase != (unsigned long)ser->iomem_base) 1515ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1516ab4382d2SGreg Kroah-Hartman if (sport->port.iobase != ser->port) 1517ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1518ab4382d2SGreg Kroah-Hartman if (ser->hub6 != 0) 1519ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1520ab4382d2SGreg Kroah-Hartman return ret; 1521ab4382d2SGreg Kroah-Hartman } 1522ab4382d2SGreg Kroah-Hartman 152301f56abdSSaleem Abdulrasool #if defined(CONFIG_CONSOLE_POLL) 15246b8bdad9SDaniel Thompson 15256b8bdad9SDaniel Thompson static int imx_poll_init(struct uart_port *port) 15266b8bdad9SDaniel Thompson { 15276b8bdad9SDaniel Thompson struct imx_port *sport = (struct imx_port *)port; 15286b8bdad9SDaniel Thompson unsigned long flags; 15296b8bdad9SDaniel Thompson unsigned long temp; 15306b8bdad9SDaniel Thompson int retval; 15316b8bdad9SDaniel Thompson 15326b8bdad9SDaniel Thompson retval = clk_prepare_enable(sport->clk_ipg); 15336b8bdad9SDaniel Thompson if (retval) 15346b8bdad9SDaniel Thompson return retval; 15356b8bdad9SDaniel Thompson retval = clk_prepare_enable(sport->clk_per); 15366b8bdad9SDaniel Thompson if (retval) 15376b8bdad9SDaniel Thompson clk_disable_unprepare(sport->clk_ipg); 15386b8bdad9SDaniel Thompson 15396b8bdad9SDaniel Thompson imx_setup_ufcr(sport, 0); 15406b8bdad9SDaniel Thompson 15416b8bdad9SDaniel Thompson spin_lock_irqsave(&sport->port.lock, flags); 15426b8bdad9SDaniel Thompson 15436b8bdad9SDaniel Thompson temp = readl(sport->port.membase + UCR1); 15446b8bdad9SDaniel Thompson if (is_imx1_uart(sport)) 15456b8bdad9SDaniel Thompson temp |= IMX1_UCR1_UARTCLKEN; 15466b8bdad9SDaniel Thompson temp |= UCR1_UARTEN | UCR1_RRDYEN; 15476b8bdad9SDaniel Thompson temp &= ~(UCR1_TXMPTYEN | UCR1_RTSDEN); 15486b8bdad9SDaniel Thompson writel(temp, sport->port.membase + UCR1); 15496b8bdad9SDaniel Thompson 15506b8bdad9SDaniel Thompson temp = readl(sport->port.membase + UCR2); 15516b8bdad9SDaniel Thompson temp |= UCR2_RXEN; 15526b8bdad9SDaniel Thompson writel(temp, sport->port.membase + UCR2); 15536b8bdad9SDaniel Thompson 15546b8bdad9SDaniel Thompson spin_unlock_irqrestore(&sport->port.lock, flags); 15556b8bdad9SDaniel Thompson 15566b8bdad9SDaniel Thompson return 0; 15576b8bdad9SDaniel Thompson } 15586b8bdad9SDaniel Thompson 155901f56abdSSaleem Abdulrasool static int imx_poll_get_char(struct uart_port *port) 156001f56abdSSaleem Abdulrasool { 1561f968ef34SDaniel Thompson if (!(readl_relaxed(port->membase + USR2) & USR2_RDR)) 156226c47412SDirk Behme return NO_POLL_CHAR; 156301f56abdSSaleem Abdulrasool 1564f968ef34SDaniel Thompson return readl_relaxed(port->membase + URXD0) & URXD_RX_DATA; 156501f56abdSSaleem Abdulrasool } 156601f56abdSSaleem Abdulrasool 156701f56abdSSaleem Abdulrasool static void imx_poll_put_char(struct uart_port *port, unsigned char c) 156801f56abdSSaleem Abdulrasool { 156901f56abdSSaleem Abdulrasool unsigned int status; 157001f56abdSSaleem Abdulrasool 157101f56abdSSaleem Abdulrasool /* drain */ 157201f56abdSSaleem Abdulrasool do { 1573f968ef34SDaniel Thompson status = readl_relaxed(port->membase + USR1); 157401f56abdSSaleem Abdulrasool } while (~status & USR1_TRDY); 157501f56abdSSaleem Abdulrasool 157601f56abdSSaleem Abdulrasool /* write */ 1577f968ef34SDaniel Thompson writel_relaxed(c, port->membase + URTX0); 157801f56abdSSaleem Abdulrasool 157901f56abdSSaleem Abdulrasool /* flush */ 158001f56abdSSaleem Abdulrasool do { 1581f968ef34SDaniel Thompson status = readl_relaxed(port->membase + USR2); 158201f56abdSSaleem Abdulrasool } while (~status & USR2_TXDC); 158301f56abdSSaleem Abdulrasool } 158401f56abdSSaleem Abdulrasool #endif 158501f56abdSSaleem Abdulrasool 1586ab4382d2SGreg Kroah-Hartman static struct uart_ops imx_pops = { 1587ab4382d2SGreg Kroah-Hartman .tx_empty = imx_tx_empty, 1588ab4382d2SGreg Kroah-Hartman .set_mctrl = imx_set_mctrl, 1589ab4382d2SGreg Kroah-Hartman .get_mctrl = imx_get_mctrl, 1590ab4382d2SGreg Kroah-Hartman .stop_tx = imx_stop_tx, 1591ab4382d2SGreg Kroah-Hartman .start_tx = imx_start_tx, 1592ab4382d2SGreg Kroah-Hartman .stop_rx = imx_stop_rx, 1593ab4382d2SGreg Kroah-Hartman .enable_ms = imx_enable_ms, 1594ab4382d2SGreg Kroah-Hartman .break_ctl = imx_break_ctl, 1595ab4382d2SGreg Kroah-Hartman .startup = imx_startup, 1596ab4382d2SGreg Kroah-Hartman .shutdown = imx_shutdown, 1597eb56b7edSHuang Shijie .flush_buffer = imx_flush_buffer, 1598ab4382d2SGreg Kroah-Hartman .set_termios = imx_set_termios, 1599ab4382d2SGreg Kroah-Hartman .type = imx_type, 1600ab4382d2SGreg Kroah-Hartman .config_port = imx_config_port, 1601ab4382d2SGreg Kroah-Hartman .verify_port = imx_verify_port, 160201f56abdSSaleem Abdulrasool #if defined(CONFIG_CONSOLE_POLL) 16036b8bdad9SDaniel Thompson .poll_init = imx_poll_init, 160401f56abdSSaleem Abdulrasool .poll_get_char = imx_poll_get_char, 160501f56abdSSaleem Abdulrasool .poll_put_char = imx_poll_put_char, 160601f56abdSSaleem Abdulrasool #endif 1607ab4382d2SGreg Kroah-Hartman }; 1608ab4382d2SGreg Kroah-Hartman 1609ab4382d2SGreg Kroah-Hartman static struct imx_port *imx_ports[UART_NR]; 1610ab4382d2SGreg Kroah-Hartman 1611ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_IMX_CONSOLE 1612ab4382d2SGreg Kroah-Hartman static void imx_console_putchar(struct uart_port *port, int ch) 1613ab4382d2SGreg Kroah-Hartman { 1614ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1615ab4382d2SGreg Kroah-Hartman 1616fe6b540aSShawn Guo while (readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL) 1617ab4382d2SGreg Kroah-Hartman barrier(); 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman writel(ch, sport->port.membase + URTX0); 1620ab4382d2SGreg Kroah-Hartman } 1621ab4382d2SGreg Kroah-Hartman 1622ab4382d2SGreg Kroah-Hartman /* 1623ab4382d2SGreg Kroah-Hartman * Interrupts are disabled on entering 1624ab4382d2SGreg Kroah-Hartman */ 1625ab4382d2SGreg Kroah-Hartman static void 1626ab4382d2SGreg Kroah-Hartman imx_console_write(struct console *co, const char *s, unsigned int count) 1627ab4382d2SGreg Kroah-Hartman { 1628ab4382d2SGreg Kroah-Hartman struct imx_port *sport = imx_ports[co->index]; 16290ad5a814SDirk Behme struct imx_port_ucrs old_ucr; 16300ad5a814SDirk Behme unsigned int ucr1; 1631f30e8260SShawn Guo unsigned long flags = 0; 1632677fe555SThomas Gleixner int locked = 1; 16331cf93e0dSHuang Shijie int retval; 16341cf93e0dSHuang Shijie 16351cf93e0dSHuang Shijie retval = clk_enable(sport->clk_per); 16361cf93e0dSHuang Shijie if (retval) 16371cf93e0dSHuang Shijie return; 16381cf93e0dSHuang Shijie retval = clk_enable(sport->clk_ipg); 16391cf93e0dSHuang Shijie if (retval) { 16401cf93e0dSHuang Shijie clk_disable(sport->clk_per); 16411cf93e0dSHuang Shijie return; 16421cf93e0dSHuang Shijie } 16439ec1882dSXinyu Chen 1644677fe555SThomas Gleixner if (sport->port.sysrq) 1645677fe555SThomas Gleixner locked = 0; 1646677fe555SThomas Gleixner else if (oops_in_progress) 1647677fe555SThomas Gleixner locked = spin_trylock_irqsave(&sport->port.lock, flags); 1648677fe555SThomas Gleixner else 16499ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1650ab4382d2SGreg Kroah-Hartman 1651ab4382d2SGreg Kroah-Hartman /* 16520ad5a814SDirk Behme * First, save UCR1/2/3 and then disable interrupts 1653ab4382d2SGreg Kroah-Hartman */ 16540ad5a814SDirk Behme imx_port_ucrs_save(&sport->port, &old_ucr); 16550ad5a814SDirk Behme ucr1 = old_ucr.ucr1; 1656ab4382d2SGreg Kroah-Hartman 1657fe6b540aSShawn Guo if (is_imx1_uart(sport)) 1658fe6b540aSShawn Guo ucr1 |= IMX1_UCR1_UARTCLKEN; 1659ab4382d2SGreg Kroah-Hartman ucr1 |= UCR1_UARTEN; 1660ab4382d2SGreg Kroah-Hartman ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN); 1661ab4382d2SGreg Kroah-Hartman 1662ab4382d2SGreg Kroah-Hartman writel(ucr1, sport->port.membase + UCR1); 1663ab4382d2SGreg Kroah-Hartman 16640ad5a814SDirk Behme writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2); 1665ab4382d2SGreg Kroah-Hartman 1666ab4382d2SGreg Kroah-Hartman uart_console_write(&sport->port, s, count, imx_console_putchar); 1667ab4382d2SGreg Kroah-Hartman 1668ab4382d2SGreg Kroah-Hartman /* 1669ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 16700ad5a814SDirk Behme * and restore UCR1/2/3 1671ab4382d2SGreg Kroah-Hartman */ 1672ab4382d2SGreg Kroah-Hartman while (!(readl(sport->port.membase + USR2) & USR2_TXDC)); 1673ab4382d2SGreg Kroah-Hartman 16740ad5a814SDirk Behme imx_port_ucrs_restore(&sport->port, &old_ucr); 16759ec1882dSXinyu Chen 1676677fe555SThomas Gleixner if (locked) 16779ec1882dSXinyu Chen spin_unlock_irqrestore(&sport->port.lock, flags); 16781cf93e0dSHuang Shijie 16791cf93e0dSHuang Shijie clk_disable(sport->clk_ipg); 16801cf93e0dSHuang Shijie clk_disable(sport->clk_per); 1681ab4382d2SGreg Kroah-Hartman } 1682ab4382d2SGreg Kroah-Hartman 1683ab4382d2SGreg Kroah-Hartman /* 1684ab4382d2SGreg Kroah-Hartman * If the port was already initialised (eg, by a boot loader), 1685ab4382d2SGreg Kroah-Hartman * try to determine the current setup. 1686ab4382d2SGreg Kroah-Hartman */ 1687ab4382d2SGreg Kroah-Hartman static void __init 1688ab4382d2SGreg Kroah-Hartman imx_console_get_options(struct imx_port *sport, int *baud, 1689ab4382d2SGreg Kroah-Hartman int *parity, int *bits) 1690ab4382d2SGreg Kroah-Hartman { 1691ab4382d2SGreg Kroah-Hartman 1692ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) { 1693ab4382d2SGreg Kroah-Hartman /* ok, the port was enabled */ 1694ab4382d2SGreg Kroah-Hartman unsigned int ucr2, ubir, ubmr, uartclk; 1695ab4382d2SGreg Kroah-Hartman unsigned int baud_raw; 1696ab4382d2SGreg Kroah-Hartman unsigned int ucfr_rfdiv; 1697ab4382d2SGreg Kroah-Hartman 1698ab4382d2SGreg Kroah-Hartman ucr2 = readl(sport->port.membase + UCR2); 1699ab4382d2SGreg Kroah-Hartman 1700ab4382d2SGreg Kroah-Hartman *parity = 'n'; 1701ab4382d2SGreg Kroah-Hartman if (ucr2 & UCR2_PREN) { 1702ab4382d2SGreg Kroah-Hartman if (ucr2 & UCR2_PROE) 1703ab4382d2SGreg Kroah-Hartman *parity = 'o'; 1704ab4382d2SGreg Kroah-Hartman else 1705ab4382d2SGreg Kroah-Hartman *parity = 'e'; 1706ab4382d2SGreg Kroah-Hartman } 1707ab4382d2SGreg Kroah-Hartman 1708ab4382d2SGreg Kroah-Hartman if (ucr2 & UCR2_WS) 1709ab4382d2SGreg Kroah-Hartman *bits = 8; 1710ab4382d2SGreg Kroah-Hartman else 1711ab4382d2SGreg Kroah-Hartman *bits = 7; 1712ab4382d2SGreg Kroah-Hartman 1713ab4382d2SGreg Kroah-Hartman ubir = readl(sport->port.membase + UBIR) & 0xffff; 1714ab4382d2SGreg Kroah-Hartman ubmr = readl(sport->port.membase + UBMR) & 0xffff; 1715ab4382d2SGreg Kroah-Hartman 1716ab4382d2SGreg Kroah-Hartman ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7; 1717ab4382d2SGreg Kroah-Hartman if (ucfr_rfdiv == 6) 1718ab4382d2SGreg Kroah-Hartman ucfr_rfdiv = 7; 1719ab4382d2SGreg Kroah-Hartman else 1720ab4382d2SGreg Kroah-Hartman ucfr_rfdiv = 6 - ucfr_rfdiv; 1721ab4382d2SGreg Kroah-Hartman 17223a9465faSSascha Hauer uartclk = clk_get_rate(sport->clk_per); 1723ab4382d2SGreg Kroah-Hartman uartclk /= ucfr_rfdiv; 1724ab4382d2SGreg Kroah-Hartman 1725ab4382d2SGreg Kroah-Hartman { /* 1726ab4382d2SGreg Kroah-Hartman * The next code provides exact computation of 1727ab4382d2SGreg Kroah-Hartman * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1)) 1728ab4382d2SGreg Kroah-Hartman * without need of float support or long long division, 1729ab4382d2SGreg Kroah-Hartman * which would be required to prevent 32bit arithmetic overflow 1730ab4382d2SGreg Kroah-Hartman */ 1731ab4382d2SGreg Kroah-Hartman unsigned int mul = ubir + 1; 1732ab4382d2SGreg Kroah-Hartman unsigned int div = 16 * (ubmr + 1); 1733ab4382d2SGreg Kroah-Hartman unsigned int rem = uartclk % div; 1734ab4382d2SGreg Kroah-Hartman 1735ab4382d2SGreg Kroah-Hartman baud_raw = (uartclk / div) * mul; 1736ab4382d2SGreg Kroah-Hartman baud_raw += (rem * mul + div / 2) / div; 1737ab4382d2SGreg Kroah-Hartman *baud = (baud_raw + 50) / 100 * 100; 1738ab4382d2SGreg Kroah-Hartman } 1739ab4382d2SGreg Kroah-Hartman 1740ab4382d2SGreg Kroah-Hartman if (*baud != baud_raw) 174150bbdba3SSachin Kamat pr_info("Console IMX rounded baud rate from %d to %d\n", 1742ab4382d2SGreg Kroah-Hartman baud_raw, *baud); 1743ab4382d2SGreg Kroah-Hartman } 1744ab4382d2SGreg Kroah-Hartman } 1745ab4382d2SGreg Kroah-Hartman 1746ab4382d2SGreg Kroah-Hartman static int __init 1747ab4382d2SGreg Kroah-Hartman imx_console_setup(struct console *co, char *options) 1748ab4382d2SGreg Kroah-Hartman { 1749ab4382d2SGreg Kroah-Hartman struct imx_port *sport; 1750ab4382d2SGreg Kroah-Hartman int baud = 9600; 1751ab4382d2SGreg Kroah-Hartman int bits = 8; 1752ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1753ab4382d2SGreg Kroah-Hartman int flow = 'n'; 17541cf93e0dSHuang Shijie int retval; 1755ab4382d2SGreg Kroah-Hartman 1756ab4382d2SGreg Kroah-Hartman /* 1757ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1758ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1759ab4382d2SGreg Kroah-Hartman * console support. 1760ab4382d2SGreg Kroah-Hartman */ 1761ab4382d2SGreg Kroah-Hartman if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports)) 1762ab4382d2SGreg Kroah-Hartman co->index = 0; 1763ab4382d2SGreg Kroah-Hartman sport = imx_ports[co->index]; 1764ab4382d2SGreg Kroah-Hartman if (sport == NULL) 1765ab4382d2SGreg Kroah-Hartman return -ENODEV; 1766ab4382d2SGreg Kroah-Hartman 17671cf93e0dSHuang Shijie /* For setting the registers, we only need to enable the ipg clock. */ 17681cf93e0dSHuang Shijie retval = clk_prepare_enable(sport->clk_ipg); 17691cf93e0dSHuang Shijie if (retval) 17701cf93e0dSHuang Shijie goto error_console; 17711cf93e0dSHuang Shijie 1772ab4382d2SGreg Kroah-Hartman if (options) 1773ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1774ab4382d2SGreg Kroah-Hartman else 1775ab4382d2SGreg Kroah-Hartman imx_console_get_options(sport, &baud, &parity, &bits); 1776ab4382d2SGreg Kroah-Hartman 1777ab4382d2SGreg Kroah-Hartman imx_setup_ufcr(sport, 0); 1778ab4382d2SGreg Kroah-Hartman 17791cf93e0dSHuang Shijie retval = uart_set_options(&sport->port, co, baud, parity, bits, flow); 17801cf93e0dSHuang Shijie 17811cf93e0dSHuang Shijie clk_disable(sport->clk_ipg); 17821cf93e0dSHuang Shijie if (retval) { 17831cf93e0dSHuang Shijie clk_unprepare(sport->clk_ipg); 17841cf93e0dSHuang Shijie goto error_console; 17851cf93e0dSHuang Shijie } 17861cf93e0dSHuang Shijie 17871cf93e0dSHuang Shijie retval = clk_prepare(sport->clk_per); 17881cf93e0dSHuang Shijie if (retval) 17891cf93e0dSHuang Shijie clk_disable_unprepare(sport->clk_ipg); 17901cf93e0dSHuang Shijie 17911cf93e0dSHuang Shijie error_console: 17921cf93e0dSHuang Shijie return retval; 1793ab4382d2SGreg Kroah-Hartman } 1794ab4382d2SGreg Kroah-Hartman 1795ab4382d2SGreg Kroah-Hartman static struct uart_driver imx_reg; 1796ab4382d2SGreg Kroah-Hartman static struct console imx_console = { 1797ab4382d2SGreg Kroah-Hartman .name = DEV_NAME, 1798ab4382d2SGreg Kroah-Hartman .write = imx_console_write, 1799ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1800ab4382d2SGreg Kroah-Hartman .setup = imx_console_setup, 1801ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1802ab4382d2SGreg Kroah-Hartman .index = -1, 1803ab4382d2SGreg Kroah-Hartman .data = &imx_reg, 1804ab4382d2SGreg Kroah-Hartman }; 1805ab4382d2SGreg Kroah-Hartman 1806ab4382d2SGreg Kroah-Hartman #define IMX_CONSOLE &imx_console 1807ab4382d2SGreg Kroah-Hartman #else 1808ab4382d2SGreg Kroah-Hartman #define IMX_CONSOLE NULL 1809ab4382d2SGreg Kroah-Hartman #endif 1810ab4382d2SGreg Kroah-Hartman 1811ab4382d2SGreg Kroah-Hartman static struct uart_driver imx_reg = { 1812ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1813ab4382d2SGreg Kroah-Hartman .driver_name = DRIVER_NAME, 1814ab4382d2SGreg Kroah-Hartman .dev_name = DEV_NAME, 1815ab4382d2SGreg Kroah-Hartman .major = SERIAL_IMX_MAJOR, 1816ab4382d2SGreg Kroah-Hartman .minor = MINOR_START, 1817ab4382d2SGreg Kroah-Hartman .nr = ARRAY_SIZE(imx_ports), 1818ab4382d2SGreg Kroah-Hartman .cons = IMX_CONSOLE, 1819ab4382d2SGreg Kroah-Hartman }; 1820ab4382d2SGreg Kroah-Hartman 1821ab4382d2SGreg Kroah-Hartman static int serial_imx_suspend(struct platform_device *dev, pm_message_t state) 1822ab4382d2SGreg Kroah-Hartman { 1823ab4382d2SGreg Kroah-Hartman struct imx_port *sport = platform_get_drvdata(dev); 1824db1a9b55SFabio Estevam unsigned int val; 1825db1a9b55SFabio Estevam 1826db1a9b55SFabio Estevam /* enable wakeup from i.MX UART */ 1827db1a9b55SFabio Estevam val = readl(sport->port.membase + UCR3); 1828db1a9b55SFabio Estevam val |= UCR3_AWAKEN; 1829db1a9b55SFabio Estevam writel(val, sport->port.membase + UCR3); 1830ab4382d2SGreg Kroah-Hartman 1831ab4382d2SGreg Kroah-Hartman uart_suspend_port(&imx_reg, &sport->port); 1832ab4382d2SGreg Kroah-Hartman 1833ab4382d2SGreg Kroah-Hartman return 0; 1834ab4382d2SGreg Kroah-Hartman } 1835ab4382d2SGreg Kroah-Hartman 1836ab4382d2SGreg Kroah-Hartman static int serial_imx_resume(struct platform_device *dev) 1837ab4382d2SGreg Kroah-Hartman { 1838ab4382d2SGreg Kroah-Hartman struct imx_port *sport = platform_get_drvdata(dev); 1839db1a9b55SFabio Estevam unsigned int val; 1840db1a9b55SFabio Estevam 1841db1a9b55SFabio Estevam /* disable wakeup from i.MX UART */ 1842db1a9b55SFabio Estevam val = readl(sport->port.membase + UCR3); 1843db1a9b55SFabio Estevam val &= ~UCR3_AWAKEN; 1844db1a9b55SFabio Estevam writel(val, sport->port.membase + UCR3); 1845ab4382d2SGreg Kroah-Hartman 1846ab4382d2SGreg Kroah-Hartman uart_resume_port(&imx_reg, &sport->port); 1847ab4382d2SGreg Kroah-Hartman 1848ab4382d2SGreg Kroah-Hartman return 0; 1849ab4382d2SGreg Kroah-Hartman } 1850ab4382d2SGreg Kroah-Hartman 185122698aa2SShawn Guo #ifdef CONFIG_OF 185220bb8095SUwe Kleine-König /* 185320bb8095SUwe Kleine-König * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it 185420bb8095SUwe Kleine-König * could successfully get all information from dt or a negative errno. 185520bb8095SUwe Kleine-König */ 185622698aa2SShawn Guo static int serial_imx_probe_dt(struct imx_port *sport, 185722698aa2SShawn Guo struct platform_device *pdev) 185822698aa2SShawn Guo { 185922698aa2SShawn Guo struct device_node *np = pdev->dev.of_node; 186022698aa2SShawn Guo const struct of_device_id *of_id = 186122698aa2SShawn Guo of_match_device(imx_uart_dt_ids, &pdev->dev); 1862ff05967aSShawn Guo int ret; 186322698aa2SShawn Guo 186422698aa2SShawn Guo if (!np) 186520bb8095SUwe Kleine-König /* no device tree device */ 186620bb8095SUwe Kleine-König return 1; 186722698aa2SShawn Guo 1868ff05967aSShawn Guo ret = of_alias_get_id(np, "serial"); 1869ff05967aSShawn Guo if (ret < 0) { 1870ff05967aSShawn Guo dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); 1871a197a191SUwe Kleine-König return ret; 1872ff05967aSShawn Guo } 1873ff05967aSShawn Guo sport->port.line = ret; 187422698aa2SShawn Guo 187522698aa2SShawn Guo if (of_get_property(np, "fsl,uart-has-rtscts", NULL)) 187622698aa2SShawn Guo sport->have_rtscts = 1; 187722698aa2SShawn Guo 187822698aa2SShawn Guo if (of_get_property(np, "fsl,irda-mode", NULL)) 187922698aa2SShawn Guo sport->use_irda = 1; 188022698aa2SShawn Guo 188120ff2fe6SHuang Shijie if (of_get_property(np, "fsl,dte-mode", NULL)) 188220ff2fe6SHuang Shijie sport->dte_mode = 1; 188320ff2fe6SHuang Shijie 188422698aa2SShawn Guo sport->devdata = of_id->data; 188522698aa2SShawn Guo 188622698aa2SShawn Guo return 0; 188722698aa2SShawn Guo } 188822698aa2SShawn Guo #else 188922698aa2SShawn Guo static inline int serial_imx_probe_dt(struct imx_port *sport, 189022698aa2SShawn Guo struct platform_device *pdev) 189122698aa2SShawn Guo { 189220bb8095SUwe Kleine-König return 1; 189322698aa2SShawn Guo } 189422698aa2SShawn Guo #endif 189522698aa2SShawn Guo 189622698aa2SShawn Guo static void serial_imx_probe_pdata(struct imx_port *sport, 189722698aa2SShawn Guo struct platform_device *pdev) 189822698aa2SShawn Guo { 1899574de559SJingoo Han struct imxuart_platform_data *pdata = dev_get_platdata(&pdev->dev); 190022698aa2SShawn Guo 190122698aa2SShawn Guo sport->port.line = pdev->id; 190222698aa2SShawn Guo sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data; 190322698aa2SShawn Guo 190422698aa2SShawn Guo if (!pdata) 190522698aa2SShawn Guo return; 190622698aa2SShawn Guo 190722698aa2SShawn Guo if (pdata->flags & IMXUART_HAVE_RTSCTS) 190822698aa2SShawn Guo sport->have_rtscts = 1; 190922698aa2SShawn Guo 191022698aa2SShawn Guo if (pdata->flags & IMXUART_IRDA) 191122698aa2SShawn Guo sport->use_irda = 1; 191222698aa2SShawn Guo } 191322698aa2SShawn Guo 1914ab4382d2SGreg Kroah-Hartman static int serial_imx_probe(struct platform_device *pdev) 1915ab4382d2SGreg Kroah-Hartman { 1916ab4382d2SGreg Kroah-Hartman struct imx_port *sport; 1917ab4382d2SGreg Kroah-Hartman void __iomem *base; 1918ab4382d2SGreg Kroah-Hartman int ret = 0; 1919ab4382d2SGreg Kroah-Hartman struct resource *res; 1920ab4382d2SGreg Kroah-Hartman 192142d34191SSachin Kamat sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); 1922ab4382d2SGreg Kroah-Hartman if (!sport) 1923ab4382d2SGreg Kroah-Hartman return -ENOMEM; 1924ab4382d2SGreg Kroah-Hartman 192522698aa2SShawn Guo ret = serial_imx_probe_dt(sport, pdev); 192620bb8095SUwe Kleine-König if (ret > 0) 192722698aa2SShawn Guo serial_imx_probe_pdata(sport, pdev); 192820bb8095SUwe Kleine-König else if (ret < 0) 192942d34191SSachin Kamat return ret; 193022698aa2SShawn Guo 1931ab4382d2SGreg Kroah-Hartman res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1932da82f997SAlexander Shiyan base = devm_ioremap_resource(&pdev->dev, res); 1933da82f997SAlexander Shiyan if (IS_ERR(base)) 1934da82f997SAlexander Shiyan return PTR_ERR(base); 1935ab4382d2SGreg Kroah-Hartman 1936ab4382d2SGreg Kroah-Hartman sport->port.dev = &pdev->dev; 1937ab4382d2SGreg Kroah-Hartman sport->port.mapbase = res->start; 1938ab4382d2SGreg Kroah-Hartman sport->port.membase = base; 1939ab4382d2SGreg Kroah-Hartman sport->port.type = PORT_IMX, 1940ab4382d2SGreg Kroah-Hartman sport->port.iotype = UPIO_MEM; 1941ab4382d2SGreg Kroah-Hartman sport->port.irq = platform_get_irq(pdev, 0); 1942ab4382d2SGreg Kroah-Hartman sport->rxirq = platform_get_irq(pdev, 0); 1943ab4382d2SGreg Kroah-Hartman sport->txirq = platform_get_irq(pdev, 1); 1944ab4382d2SGreg Kroah-Hartman sport->rtsirq = platform_get_irq(pdev, 2); 1945ab4382d2SGreg Kroah-Hartman sport->port.fifosize = 32; 1946ab4382d2SGreg Kroah-Hartman sport->port.ops = &imx_pops; 1947ab4382d2SGreg Kroah-Hartman sport->port.flags = UPF_BOOT_AUTOCONF; 1948ab4382d2SGreg Kroah-Hartman init_timer(&sport->timer); 1949ab4382d2SGreg Kroah-Hartman sport->timer.function = imx_timeout; 1950ab4382d2SGreg Kroah-Hartman sport->timer.data = (unsigned long)sport; 1951ab4382d2SGreg Kroah-Hartman 19523a9465faSSascha Hauer sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 19533a9465faSSascha Hauer if (IS_ERR(sport->clk_ipg)) { 19543a9465faSSascha Hauer ret = PTR_ERR(sport->clk_ipg); 1955833462e9SUwe Kleine-König dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret); 195642d34191SSachin Kamat return ret; 1957ab4382d2SGreg Kroah-Hartman } 1958ab4382d2SGreg Kroah-Hartman 19593a9465faSSascha Hauer sport->clk_per = devm_clk_get(&pdev->dev, "per"); 19603a9465faSSascha Hauer if (IS_ERR(sport->clk_per)) { 19613a9465faSSascha Hauer ret = PTR_ERR(sport->clk_per); 1962833462e9SUwe Kleine-König dev_err(&pdev->dev, "failed to get per clk: %d\n", ret); 196342d34191SSachin Kamat return ret; 19643a9465faSSascha Hauer } 19653a9465faSSascha Hauer 19663a9465faSSascha Hauer sport->port.uartclk = clk_get_rate(sport->clk_per); 1967ab4382d2SGreg Kroah-Hartman 1968c0d1c6b0SFabio Estevam /* 1969c0d1c6b0SFabio Estevam * Allocate the IRQ(s) i.MX1 has three interrupts whereas later 1970c0d1c6b0SFabio Estevam * chips only have one interrupt. 1971c0d1c6b0SFabio Estevam */ 1972c0d1c6b0SFabio Estevam if (sport->txirq > 0) { 1973c0d1c6b0SFabio Estevam ret = devm_request_irq(&pdev->dev, sport->rxirq, imx_rxint, 0, 1974c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 1975c0d1c6b0SFabio Estevam if (ret) 1976c0d1c6b0SFabio Estevam return ret; 1977c0d1c6b0SFabio Estevam 1978c0d1c6b0SFabio Estevam ret = devm_request_irq(&pdev->dev, sport->txirq, imx_txint, 0, 1979c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 1980c0d1c6b0SFabio Estevam if (ret) 1981c0d1c6b0SFabio Estevam return ret; 1982c0d1c6b0SFabio Estevam 1983c0d1c6b0SFabio Estevam /* do not use RTS IRQ on IrDA */ 1984c0d1c6b0SFabio Estevam if (!USE_IRDA(sport)) { 1985c0d1c6b0SFabio Estevam ret = devm_request_irq(&pdev->dev, sport->rtsirq, 1986c0d1c6b0SFabio Estevam imx_rtsint, 0, 1987c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 1988c0d1c6b0SFabio Estevam if (ret) 1989c0d1c6b0SFabio Estevam return ret; 1990c0d1c6b0SFabio Estevam } 1991c0d1c6b0SFabio Estevam } else { 1992c0d1c6b0SFabio Estevam ret = devm_request_irq(&pdev->dev, sport->port.irq, imx_int, 0, 1993c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 1994c0d1c6b0SFabio Estevam if (ret) 1995c0d1c6b0SFabio Estevam return ret; 1996c0d1c6b0SFabio Estevam } 1997c0d1c6b0SFabio Estevam 199822698aa2SShawn Guo imx_ports[sport->port.line] = sport; 1999ab4382d2SGreg Kroah-Hartman 20000a86a86bSRichard Zhao platform_set_drvdata(pdev, sport); 2001ab4382d2SGreg Kroah-Hartman 200245af780aSAlexander Shiyan return uart_add_one_port(&imx_reg, &sport->port); 2003ab4382d2SGreg Kroah-Hartman } 2004ab4382d2SGreg Kroah-Hartman 2005ab4382d2SGreg Kroah-Hartman static int serial_imx_remove(struct platform_device *pdev) 2006ab4382d2SGreg Kroah-Hartman { 2007ab4382d2SGreg Kroah-Hartman struct imx_port *sport = platform_get_drvdata(pdev); 2008ab4382d2SGreg Kroah-Hartman 200945af780aSAlexander Shiyan return uart_remove_one_port(&imx_reg, &sport->port); 2010ab4382d2SGreg Kroah-Hartman } 2011ab4382d2SGreg Kroah-Hartman 2012ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_imx_driver = { 2013ab4382d2SGreg Kroah-Hartman .probe = serial_imx_probe, 2014ab4382d2SGreg Kroah-Hartman .remove = serial_imx_remove, 2015ab4382d2SGreg Kroah-Hartman 2016ab4382d2SGreg Kroah-Hartman .suspend = serial_imx_suspend, 2017ab4382d2SGreg Kroah-Hartman .resume = serial_imx_resume, 2018fe6b540aSShawn Guo .id_table = imx_uart_devtype, 2019ab4382d2SGreg Kroah-Hartman .driver = { 2020ab4382d2SGreg Kroah-Hartman .name = "imx-uart", 202122698aa2SShawn Guo .of_match_table = imx_uart_dt_ids, 2022ab4382d2SGreg Kroah-Hartman }, 2023ab4382d2SGreg Kroah-Hartman }; 2024ab4382d2SGreg Kroah-Hartman 2025ab4382d2SGreg Kroah-Hartman static int __init imx_serial_init(void) 2026ab4382d2SGreg Kroah-Hartman { 2027f0fd1b73SFabio Estevam int ret = uart_register_driver(&imx_reg); 2028ab4382d2SGreg Kroah-Hartman 2029ab4382d2SGreg Kroah-Hartman if (ret) 2030ab4382d2SGreg Kroah-Hartman return ret; 2031ab4382d2SGreg Kroah-Hartman 2032ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_imx_driver); 2033ab4382d2SGreg Kroah-Hartman if (ret != 0) 2034ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&imx_reg); 2035ab4382d2SGreg Kroah-Hartman 2036f227824eSUwe Kleine-König return ret; 2037ab4382d2SGreg Kroah-Hartman } 2038ab4382d2SGreg Kroah-Hartman 2039ab4382d2SGreg Kroah-Hartman static void __exit imx_serial_exit(void) 2040ab4382d2SGreg Kroah-Hartman { 2041ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_imx_driver); 2042ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&imx_reg); 2043ab4382d2SGreg Kroah-Hartman } 2044ab4382d2SGreg Kroah-Hartman 2045ab4382d2SGreg Kroah-Hartman module_init(imx_serial_init); 2046ab4382d2SGreg Kroah-Hartman module_exit(imx_serial_exit); 2047ab4382d2SGreg Kroah-Hartman 2048ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Sascha Hauer"); 2049ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("IMX generic serial port driver"); 2050ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2051ab4382d2SGreg Kroah-Hartman MODULE_ALIAS("platform:imx-uart"); 2052