1ab4382d2SGreg Kroah-Hartman /* 2ab4382d2SGreg Kroah-Hartman * Driver for OMAP-UART controller. 3ab4382d2SGreg Kroah-Hartman * Based on drivers/serial/8250.c 4ab4382d2SGreg Kroah-Hartman * 5ab4382d2SGreg Kroah-Hartman * Copyright (C) 2010 Texas Instruments. 6ab4382d2SGreg Kroah-Hartman * 7ab4382d2SGreg Kroah-Hartman * Authors: 8ab4382d2SGreg Kroah-Hartman * Govindraj R <govindraj.raja@ti.com> 9ab4382d2SGreg Kroah-Hartman * Thara Gopinath <thara@ti.com> 10ab4382d2SGreg Kroah-Hartman * 11ab4382d2SGreg Kroah-Hartman * This program is free software; you can redistribute it and/or modify 12ab4382d2SGreg Kroah-Hartman * it under the terms of the GNU General Public License as published by 13ab4382d2SGreg Kroah-Hartman * the Free Software Foundation; either version 2 of the License, or 14ab4382d2SGreg Kroah-Hartman * (at your option) any later version. 15ab4382d2SGreg Kroah-Hartman * 1625985edcSLucas De Marchi * Note: This driver is made separate from 8250 driver as we cannot 17ab4382d2SGreg Kroah-Hartman * over load 8250 driver with omap platform specific configuration for 18ab4382d2SGreg Kroah-Hartman * features like DMA, it makes easier to implement features like DMA and 19ab4382d2SGreg Kroah-Hartman * hardware flow control and software flow control configuration with 20ab4382d2SGreg Kroah-Hartman * this driver as required for the omap-platform. 21ab4382d2SGreg Kroah-Hartman */ 22ab4382d2SGreg Kroah-Hartman 23364a6eceSThomas Weber #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 24364a6eceSThomas Weber #define SUPPORT_SYSRQ 25364a6eceSThomas Weber #endif 26364a6eceSThomas Weber 27ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 28ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 29ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/serial_reg.h> 31ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 32ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 33ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 34ab4382d2SGreg Kroah-Hartman #include <linux/tty_flip.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/io.h> 36ab4382d2SGreg Kroah-Hartman #include <linux/dma-mapping.h> 37ab4382d2SGreg Kroah-Hartman #include <linux/clk.h> 38ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 39ab4382d2SGreg Kroah-Hartman #include <linux/irq.h> 40fcdca757SGovindraj.R #include <linux/pm_runtime.h> 41ab4382d2SGreg Kroah-Hartman 42ab4382d2SGreg Kroah-Hartman #include <plat/dma.h> 43ab4382d2SGreg Kroah-Hartman #include <plat/dmtimer.h> 44ab4382d2SGreg Kroah-Hartman #include <plat/omap-serial.h> 45ab4382d2SGreg Kroah-Hartman 46fcdca757SGovindraj.R #define OMAP_UART_AUTOSUSPEND_DELAY -1 47fcdca757SGovindraj.R 48ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 49ab4382d2SGreg Kroah-Hartman 50ab4382d2SGreg Kroah-Hartman /* Forward declaration of functions */ 51ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data); 52ab4382d2SGreg Kroah-Hartman static void serial_omap_rx_timeout(unsigned long uart_no); 53ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up); 5494734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 55ab4382d2SGreg Kroah-Hartman 56ab4382d2SGreg Kroah-Hartman static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 57ab4382d2SGreg Kroah-Hartman { 58ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 59ab4382d2SGreg Kroah-Hartman return readw(up->port.membase + offset); 60ab4382d2SGreg Kroah-Hartman } 61ab4382d2SGreg Kroah-Hartman 62ab4382d2SGreg Kroah-Hartman static inline void serial_out(struct uart_omap_port *up, int offset, int value) 63ab4382d2SGreg Kroah-Hartman { 64ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 65ab4382d2SGreg Kroah-Hartman writew(value, up->port.membase + offset); 66ab4382d2SGreg Kroah-Hartman } 67ab4382d2SGreg Kroah-Hartman 68ab4382d2SGreg Kroah-Hartman static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 69ab4382d2SGreg Kroah-Hartman { 70ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 71ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 72ab4382d2SGreg Kroah-Hartman UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 73ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, 0); 74ab4382d2SGreg Kroah-Hartman } 75ab4382d2SGreg Kroah-Hartman 76ab4382d2SGreg Kroah-Hartman /* 77ab4382d2SGreg Kroah-Hartman * serial_omap_get_divisor - calculate divisor value 78ab4382d2SGreg Kroah-Hartman * @port: uart port info 79ab4382d2SGreg Kroah-Hartman * @baud: baudrate for which divisor needs to be calculated. 80ab4382d2SGreg Kroah-Hartman * 81ab4382d2SGreg Kroah-Hartman * We have written our own function to get the divisor so as to support 82ab4382d2SGreg Kroah-Hartman * 13x mode. 3Mbps Baudrate as an different divisor. 83ab4382d2SGreg Kroah-Hartman * Reference OMAP TRM Chapter 17: 84ab4382d2SGreg Kroah-Hartman * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates 85ab4382d2SGreg Kroah-Hartman * referring to oversampling - divisor value 86ab4382d2SGreg Kroah-Hartman * baudrate 460,800 to 3,686,400 all have divisor 13 87ab4382d2SGreg Kroah-Hartman * except 3,000,000 which has divisor value 16 88ab4382d2SGreg Kroah-Hartman */ 89ab4382d2SGreg Kroah-Hartman static unsigned int 90ab4382d2SGreg Kroah-Hartman serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 91ab4382d2SGreg Kroah-Hartman { 92ab4382d2SGreg Kroah-Hartman unsigned int divisor; 93ab4382d2SGreg Kroah-Hartman 94ab4382d2SGreg Kroah-Hartman if (baud > OMAP_MODE13X_SPEED && baud != 3000000) 95ab4382d2SGreg Kroah-Hartman divisor = 13; 96ab4382d2SGreg Kroah-Hartman else 97ab4382d2SGreg Kroah-Hartman divisor = 16; 98ab4382d2SGreg Kroah-Hartman return port->uartclk/(baud * divisor); 99ab4382d2SGreg Kroah-Hartman } 100ab4382d2SGreg Kroah-Hartman 101ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rxdma(struct uart_omap_port *up) 102ab4382d2SGreg Kroah-Hartman { 103ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_used) { 104ab4382d2SGreg Kroah-Hartman del_timer(&up->uart_dma.rx_timer); 105ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.rx_dma_channel); 106ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.rx_dma_channel); 107ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 108ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = false; 109fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 110fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 111ab4382d2SGreg Kroah-Hartman } 112ab4382d2SGreg Kroah-Hartman } 113ab4382d2SGreg Kroah-Hartman 114ab4382d2SGreg Kroah-Hartman static void serial_omap_enable_ms(struct uart_port *port) 115ab4382d2SGreg Kroah-Hartman { 116ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 117ab4382d2SGreg Kroah-Hartman 118ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id); 119fcdca757SGovindraj.R 120fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 121ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 122ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 123fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 124ab4382d2SGreg Kroah-Hartman } 125ab4382d2SGreg Kroah-Hartman 126ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_tx(struct uart_port *port) 127ab4382d2SGreg Kroah-Hartman { 128ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 129ab4382d2SGreg Kroah-Hartman 130ab4382d2SGreg Kroah-Hartman if (up->use_dma && 131ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { 132ab4382d2SGreg Kroah-Hartman /* 133ab4382d2SGreg Kroah-Hartman * Check if dma is still active. If yes do nothing, 134ab4382d2SGreg Kroah-Hartman * return. Else stop dma 135ab4382d2SGreg Kroah-Hartman */ 136ab4382d2SGreg Kroah-Hartman if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel)) 137ab4382d2SGreg Kroah-Hartman return; 138ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 139ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.tx_dma_channel); 140ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 141fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 142fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 143ab4382d2SGreg Kroah-Hartman } 144ab4382d2SGreg Kroah-Hartman 145fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 146ab4382d2SGreg Kroah-Hartman if (up->ier & UART_IER_THRI) { 147ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_THRI; 148ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 149ab4382d2SGreg Kroah-Hartman } 150fcdca757SGovindraj.R 151fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 152fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 153ab4382d2SGreg Kroah-Hartman } 154ab4382d2SGreg Kroah-Hartman 155ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rx(struct uart_port *port) 156ab4382d2SGreg Kroah-Hartman { 157ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 158ab4382d2SGreg Kroah-Hartman 159fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 160ab4382d2SGreg Kroah-Hartman if (up->use_dma) 161ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 162ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_RLSI; 163ab4382d2SGreg Kroah-Hartman up->port.read_status_mask &= ~UART_LSR_DR; 164ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 165fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 166fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 167ab4382d2SGreg Kroah-Hartman } 168ab4382d2SGreg Kroah-Hartman 169ab4382d2SGreg Kroah-Hartman static inline void receive_chars(struct uart_omap_port *up, int *status) 170ab4382d2SGreg Kroah-Hartman { 171ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = up->port.state->port.tty; 172ab4382d2SGreg Kroah-Hartman unsigned int flag; 173ab4382d2SGreg Kroah-Hartman unsigned char ch, lsr = *status; 174ab4382d2SGreg Kroah-Hartman int max_count = 256; 175ab4382d2SGreg Kroah-Hartman 176ab4382d2SGreg Kroah-Hartman do { 177ab4382d2SGreg Kroah-Hartman if (likely(lsr & UART_LSR_DR)) 178ab4382d2SGreg Kroah-Hartman ch = serial_in(up, UART_RX); 179ab4382d2SGreg Kroah-Hartman flag = TTY_NORMAL; 180ab4382d2SGreg Kroah-Hartman up->port.icount.rx++; 181ab4382d2SGreg Kroah-Hartman 182ab4382d2SGreg Kroah-Hartman if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 183ab4382d2SGreg Kroah-Hartman /* 184ab4382d2SGreg Kroah-Hartman * For statistics only 185ab4382d2SGreg Kroah-Hartman */ 186ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) { 187ab4382d2SGreg Kroah-Hartman lsr &= ~(UART_LSR_FE | UART_LSR_PE); 188ab4382d2SGreg Kroah-Hartman up->port.icount.brk++; 189ab4382d2SGreg Kroah-Hartman /* 190ab4382d2SGreg Kroah-Hartman * We do the SysRQ and SAK checking 191ab4382d2SGreg Kroah-Hartman * here because otherwise the break 192ab4382d2SGreg Kroah-Hartman * may get masked by ignore_status_mask 193ab4382d2SGreg Kroah-Hartman * or read_status_mask. 194ab4382d2SGreg Kroah-Hartman */ 195ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&up->port)) 196ab4382d2SGreg Kroah-Hartman goto ignore_char; 197ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_PE) { 198ab4382d2SGreg Kroah-Hartman up->port.icount.parity++; 199ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_FE) { 200ab4382d2SGreg Kroah-Hartman up->port.icount.frame++; 201ab4382d2SGreg Kroah-Hartman } 202ab4382d2SGreg Kroah-Hartman 203ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_OE) 204ab4382d2SGreg Kroah-Hartman up->port.icount.overrun++; 205ab4382d2SGreg Kroah-Hartman 206ab4382d2SGreg Kroah-Hartman /* 207ab4382d2SGreg Kroah-Hartman * Mask off conditions which should be ignored. 208ab4382d2SGreg Kroah-Hartman */ 209ab4382d2SGreg Kroah-Hartman lsr &= up->port.read_status_mask; 210ab4382d2SGreg Kroah-Hartman 211ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 212ab4382d2SGreg Kroah-Hartman if (up->port.line == up->port.cons->index) { 213ab4382d2SGreg Kroah-Hartman /* Recover the break flag from console xmit */ 214ab4382d2SGreg Kroah-Hartman lsr |= up->lsr_break_flag; 215ab4382d2SGreg Kroah-Hartman } 216ab4382d2SGreg Kroah-Hartman #endif 217ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) 218ab4382d2SGreg Kroah-Hartman flag = TTY_BREAK; 219ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_PE) 220ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 221ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_FE) 222ab4382d2SGreg Kroah-Hartman flag = TTY_FRAME; 223ab4382d2SGreg Kroah-Hartman } 224ab4382d2SGreg Kroah-Hartman 225ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&up->port, ch)) 226ab4382d2SGreg Kroah-Hartman goto ignore_char; 227ab4382d2SGreg Kroah-Hartman uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 228ab4382d2SGreg Kroah-Hartman ignore_char: 229ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 230ab4382d2SGreg Kroah-Hartman } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 231ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 232ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(tty); 233ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 234ab4382d2SGreg Kroah-Hartman } 235ab4382d2SGreg Kroah-Hartman 236ab4382d2SGreg Kroah-Hartman static void transmit_chars(struct uart_omap_port *up) 237ab4382d2SGreg Kroah-Hartman { 238ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 239ab4382d2SGreg Kroah-Hartman int count; 240ab4382d2SGreg Kroah-Hartman 241ab4382d2SGreg Kroah-Hartman if (up->port.x_char) { 242ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, up->port.x_char); 243ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 244ab4382d2SGreg Kroah-Hartman up->port.x_char = 0; 245ab4382d2SGreg Kroah-Hartman return; 246ab4382d2SGreg Kroah-Hartman } 247ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 248ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 249ab4382d2SGreg Kroah-Hartman return; 250ab4382d2SGreg Kroah-Hartman } 251ab4382d2SGreg Kroah-Hartman count = up->port.fifosize / 4; 252ab4382d2SGreg Kroah-Hartman do { 253ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, xmit->buf[xmit->tail]); 254ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 255ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 256ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 257ab4382d2SGreg Kroah-Hartman break; 258ab4382d2SGreg Kroah-Hartman } while (--count > 0); 259ab4382d2SGreg Kroah-Hartman 260ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 261ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 262ab4382d2SGreg Kroah-Hartman 263ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 264ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 265ab4382d2SGreg Kroah-Hartman } 266ab4382d2SGreg Kroah-Hartman 267ab4382d2SGreg Kroah-Hartman static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 268ab4382d2SGreg Kroah-Hartman { 269ab4382d2SGreg Kroah-Hartman if (!(up->ier & UART_IER_THRI)) { 270ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_THRI; 271ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 272ab4382d2SGreg Kroah-Hartman } 273ab4382d2SGreg Kroah-Hartman } 274ab4382d2SGreg Kroah-Hartman 275ab4382d2SGreg Kroah-Hartman static void serial_omap_start_tx(struct uart_port *port) 276ab4382d2SGreg Kroah-Hartman { 277ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 278ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit; 279ab4382d2SGreg Kroah-Hartman unsigned int start; 280ab4382d2SGreg Kroah-Hartman int ret = 0; 281ab4382d2SGreg Kroah-Hartman 282ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 283fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 284ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 285fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 286fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 287ab4382d2SGreg Kroah-Hartman return; 288ab4382d2SGreg Kroah-Hartman } 289ab4382d2SGreg Kroah-Hartman 290ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_used) 291ab4382d2SGreg Kroah-Hartman return; 292ab4382d2SGreg Kroah-Hartman 293ab4382d2SGreg Kroah-Hartman xmit = &up->port.state->xmit; 294ab4382d2SGreg Kroah-Hartman 295ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) { 296fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 297ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_tx, 298ab4382d2SGreg Kroah-Hartman "UART Tx DMA", 299ab4382d2SGreg Kroah-Hartman (void *)uart_tx_dma_callback, up, 300ab4382d2SGreg Kroah-Hartman &(up->uart_dma.tx_dma_channel)); 301ab4382d2SGreg Kroah-Hartman 302ab4382d2SGreg Kroah-Hartman if (ret < 0) { 303ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 304ab4382d2SGreg Kroah-Hartman return; 305ab4382d2SGreg Kroah-Hartman } 306ab4382d2SGreg Kroah-Hartman } 307ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 308ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = true; 309ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 310ab4382d2SGreg Kroah-Hartman 311ab4382d2SGreg Kroah-Hartman start = up->uart_dma.tx_buf_dma_phys + 312ab4382d2SGreg Kroah-Hartman (xmit->tail & (UART_XMIT_SIZE - 1)); 313ab4382d2SGreg Kroah-Hartman 314ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 315ab4382d2SGreg Kroah-Hartman /* 316ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 317ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 318ab4382d2SGreg Kroah-Hartman * transfers 319ab4382d2SGreg Kroah-Hartman */ 320ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 321ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 322ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 323ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + 324ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE) - start; 325ab4382d2SGreg Kroah-Hartman 326ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 327ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 328ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 329ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 330ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 331ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 332ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 333ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 334ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 335ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 336ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 337ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 338ab4382d2SGreg Kroah-Hartman } 339ab4382d2SGreg Kroah-Hartman 340ab4382d2SGreg Kroah-Hartman static unsigned int check_modem_status(struct uart_omap_port *up) 341ab4382d2SGreg Kroah-Hartman { 342ab4382d2SGreg Kroah-Hartman unsigned int status; 343ab4382d2SGreg Kroah-Hartman 344ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_MSR); 345ab4382d2SGreg Kroah-Hartman status |= up->msr_saved_flags; 346ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 347ab4382d2SGreg Kroah-Hartman if ((status & UART_MSR_ANY_DELTA) == 0) 348ab4382d2SGreg Kroah-Hartman return status; 349ab4382d2SGreg Kroah-Hartman 350ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 351ab4382d2SGreg Kroah-Hartman up->port.state != NULL) { 352ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_TERI) 353ab4382d2SGreg Kroah-Hartman up->port.icount.rng++; 354ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDSR) 355ab4382d2SGreg Kroah-Hartman up->port.icount.dsr++; 356ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDCD) 357ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change 358ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_DCD); 359ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCTS) 360ab4382d2SGreg Kroah-Hartman uart_handle_cts_change 361ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_CTS); 362ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&up->port.state->port.delta_msr_wait); 363ab4382d2SGreg Kroah-Hartman } 364ab4382d2SGreg Kroah-Hartman 365ab4382d2SGreg Kroah-Hartman return status; 366ab4382d2SGreg Kroah-Hartman } 367ab4382d2SGreg Kroah-Hartman 368ab4382d2SGreg Kroah-Hartman /** 369ab4382d2SGreg Kroah-Hartman * serial_omap_irq() - This handles the interrupt from one port 370ab4382d2SGreg Kroah-Hartman * @irq: uart port irq number 371ab4382d2SGreg Kroah-Hartman * @dev_id: uart port info 372ab4382d2SGreg Kroah-Hartman */ 373ab4382d2SGreg Kroah-Hartman static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) 374ab4382d2SGreg Kroah-Hartman { 375ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = dev_id; 376ab4382d2SGreg Kroah-Hartman unsigned int iir, lsr; 377ab4382d2SGreg Kroah-Hartman unsigned long flags; 378ab4382d2SGreg Kroah-Hartman 379fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 380ab4382d2SGreg Kroah-Hartman iir = serial_in(up, UART_IIR); 381fcdca757SGovindraj.R if (iir & UART_IIR_NO_INT) { 382fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 383fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 384ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 385fcdca757SGovindraj.R } 386ab4382d2SGreg Kroah-Hartman 387ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 388ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 389ab4382d2SGreg Kroah-Hartman if (iir & UART_IIR_RLSI) { 390ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 391ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_DR) 392ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 393ab4382d2SGreg Kroah-Hartman } else { 394ab4382d2SGreg Kroah-Hartman up->ier &= ~(UART_IER_RDI | UART_IER_RLSI); 395ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 396ab4382d2SGreg Kroah-Hartman if ((serial_omap_start_rxdma(up) != 0) && 397ab4382d2SGreg Kroah-Hartman (lsr & UART_LSR_DR)) 398ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 399ab4382d2SGreg Kroah-Hartman } 400ab4382d2SGreg Kroah-Hartman } 401ab4382d2SGreg Kroah-Hartman 402ab4382d2SGreg Kroah-Hartman check_modem_status(up); 403ab4382d2SGreg Kroah-Hartman if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) 404ab4382d2SGreg Kroah-Hartman transmit_chars(up); 405ab4382d2SGreg Kroah-Hartman 406ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 407fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 408fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 409fcdca757SGovindraj.R 410ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 411ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 412ab4382d2SGreg Kroah-Hartman } 413ab4382d2SGreg Kroah-Hartman 414ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_tx_empty(struct uart_port *port) 415ab4382d2SGreg Kroah-Hartman { 416ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 417ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 418ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 419ab4382d2SGreg Kroah-Hartman 420fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 421ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id); 422ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 423ab4382d2SGreg Kroah-Hartman ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 424ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 425fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 426ab4382d2SGreg Kroah-Hartman return ret; 427ab4382d2SGreg Kroah-Hartman } 428ab4382d2SGreg Kroah-Hartman 429ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_get_mctrl(struct uart_port *port) 430ab4382d2SGreg Kroah-Hartman { 431ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 432ab4382d2SGreg Kroah-Hartman unsigned char status; 433ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 434ab4382d2SGreg Kroah-Hartman 435fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 436ab4382d2SGreg Kroah-Hartman status = check_modem_status(up); 437fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 438fcdca757SGovindraj.R 439ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id); 440ab4382d2SGreg Kroah-Hartman 441ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCD) 442ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CAR; 443ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_RI) 444ab4382d2SGreg Kroah-Hartman ret |= TIOCM_RNG; 445ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DSR) 446ab4382d2SGreg Kroah-Hartman ret |= TIOCM_DSR; 447ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_CTS) 448ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CTS; 449ab4382d2SGreg Kroah-Hartman return ret; 450ab4382d2SGreg Kroah-Hartman } 451ab4382d2SGreg Kroah-Hartman 452ab4382d2SGreg Kroah-Hartman static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 453ab4382d2SGreg Kroah-Hartman { 454ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 455ab4382d2SGreg Kroah-Hartman unsigned char mcr = 0; 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id); 458ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 459ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_RTS; 460ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_DTR) 461ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_DTR; 462ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT1) 463ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT1; 464ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT2) 465ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT2; 466ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_LOOP) 467ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_LOOP; 468ab4382d2SGreg Kroah-Hartman 469fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 470c538d20cSGovindraj.R up->mcr = serial_in(up, UART_MCR); 471c538d20cSGovindraj.R up->mcr |= mcr; 472c538d20cSGovindraj.R serial_out(up, UART_MCR, up->mcr); 473fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 474ab4382d2SGreg Kroah-Hartman } 475ab4382d2SGreg Kroah-Hartman 476ab4382d2SGreg Kroah-Hartman static void serial_omap_break_ctl(struct uart_port *port, int break_state) 477ab4382d2SGreg Kroah-Hartman { 478ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 479ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 480ab4382d2SGreg Kroah-Hartman 481ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id); 482fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 483ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 484ab4382d2SGreg Kroah-Hartman if (break_state == -1) 485ab4382d2SGreg Kroah-Hartman up->lcr |= UART_LCR_SBC; 486ab4382d2SGreg Kroah-Hartman else 487ab4382d2SGreg Kroah-Hartman up->lcr &= ~UART_LCR_SBC; 488ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 489ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 490fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 491ab4382d2SGreg Kroah-Hartman } 492ab4382d2SGreg Kroah-Hartman 493ab4382d2SGreg Kroah-Hartman static int serial_omap_startup(struct uart_port *port) 494ab4382d2SGreg Kroah-Hartman { 495ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 496ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 497ab4382d2SGreg Kroah-Hartman int retval; 498ab4382d2SGreg Kroah-Hartman 499ab4382d2SGreg Kroah-Hartman /* 500ab4382d2SGreg Kroah-Hartman * Allocate the IRQ 501ab4382d2SGreg Kroah-Hartman */ 502ab4382d2SGreg Kroah-Hartman retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 503ab4382d2SGreg Kroah-Hartman up->name, up); 504ab4382d2SGreg Kroah-Hartman if (retval) 505ab4382d2SGreg Kroah-Hartman return retval; 506ab4382d2SGreg Kroah-Hartman 507ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id); 508ab4382d2SGreg Kroah-Hartman 509fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 510ab4382d2SGreg Kroah-Hartman /* 511ab4382d2SGreg Kroah-Hartman * Clear the FIFO buffers and disable them. 512ab4382d2SGreg Kroah-Hartman * (they will be reenabled in set_termios()) 513ab4382d2SGreg Kroah-Hartman */ 514ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 515ab4382d2SGreg Kroah-Hartman /* For Hardware flow control */ 516ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, UART_MCR_RTS); 517ab4382d2SGreg Kroah-Hartman 518ab4382d2SGreg Kroah-Hartman /* 519ab4382d2SGreg Kroah-Hartman * Clear the interrupt registers. 520ab4382d2SGreg Kroah-Hartman */ 521ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_LSR); 522ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 523ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 524ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_IIR); 525ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_MSR); 526ab4382d2SGreg Kroah-Hartman 527ab4382d2SGreg Kroah-Hartman /* 528ab4382d2SGreg Kroah-Hartman * Now, initialize the UART 529ab4382d2SGreg Kroah-Hartman */ 530ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_WLEN8); 531ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 532ab4382d2SGreg Kroah-Hartman /* 533ab4382d2SGreg Kroah-Hartman * Most PC uarts need OUT2 raised to enable interrupts. 534ab4382d2SGreg Kroah-Hartman */ 535ab4382d2SGreg Kroah-Hartman up->port.mctrl |= TIOCM_OUT2; 536ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 537ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 538ab4382d2SGreg Kroah-Hartman 539ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 540ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 541ab4382d2SGreg Kroah-Hartman free_page((unsigned long)up->port.state->xmit.buf); 542ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = dma_alloc_coherent(NULL, 543ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, 544ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 545ab4382d2SGreg Kroah-Hartman 0); 546ab4382d2SGreg Kroah-Hartman init_timer(&(up->uart_dma.rx_timer)); 547ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timer.function = serial_omap_rx_timeout; 548ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timer.data = up->pdev->id; 549ab4382d2SGreg Kroah-Hartman /* Currently the buffer size is 4KB. Can increase it */ 550ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = dma_alloc_coherent(NULL, 551ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 552ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0); 553ab4382d2SGreg Kroah-Hartman } 554ab4382d2SGreg Kroah-Hartman /* 555ab4382d2SGreg Kroah-Hartman * Finally, enable interrupts. Note: Modem status interrupts 556ab4382d2SGreg Kroah-Hartman * are set via set_termios(), which will be occurring imminently 557ab4382d2SGreg Kroah-Hartman * anyway, so we don't enable them here. 558ab4382d2SGreg Kroah-Hartman */ 559ab4382d2SGreg Kroah-Hartman up->ier = UART_IER_RLSI | UART_IER_RDI; 560ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 561ab4382d2SGreg Kroah-Hartman 56278841462SJarkko Nikula /* Enable module level wake up */ 56378841462SJarkko Nikula serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); 56478841462SJarkko Nikula 565fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 566fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 567ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 568ab4382d2SGreg Kroah-Hartman return 0; 569ab4382d2SGreg Kroah-Hartman } 570ab4382d2SGreg Kroah-Hartman 571ab4382d2SGreg Kroah-Hartman static void serial_omap_shutdown(struct uart_port *port) 572ab4382d2SGreg Kroah-Hartman { 573ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 574ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 575ab4382d2SGreg Kroah-Hartman 576ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id); 577fcdca757SGovindraj.R 578fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 579ab4382d2SGreg Kroah-Hartman /* 580ab4382d2SGreg Kroah-Hartman * Disable interrupts from this port 581ab4382d2SGreg Kroah-Hartman */ 582ab4382d2SGreg Kroah-Hartman up->ier = 0; 583ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 584ab4382d2SGreg Kroah-Hartman 585ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 586ab4382d2SGreg Kroah-Hartman up->port.mctrl &= ~TIOCM_OUT2; 587ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 588ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 589ab4382d2SGreg Kroah-Hartman 590ab4382d2SGreg Kroah-Hartman /* 591ab4382d2SGreg Kroah-Hartman * Disable break condition and FIFOs 592ab4382d2SGreg Kroah-Hartman */ 593ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 594ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 595ab4382d2SGreg Kroah-Hartman 596ab4382d2SGreg Kroah-Hartman /* 597ab4382d2SGreg Kroah-Hartman * Read data port to reset things, and then free the irq 598ab4382d2SGreg Kroah-Hartman */ 599ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 600ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 601ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 602ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 603ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, up->port.state->xmit.buf, 604ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys); 605ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = NULL; 606ab4382d2SGreg Kroah-Hartman serial_omap_stop_rx(port); 607ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 608ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, up->uart_dma.rx_buf, 609ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys); 610ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = NULL; 611ab4382d2SGreg Kroah-Hartman } 612fcdca757SGovindraj.R 613fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 614ab4382d2SGreg Kroah-Hartman free_irq(up->port.irq, up); 615ab4382d2SGreg Kroah-Hartman } 616ab4382d2SGreg Kroah-Hartman 617ab4382d2SGreg Kroah-Hartman static inline void 618ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff 619ab4382d2SGreg Kroah-Hartman (struct uart_omap_port *up, struct ktermios *termios) 620ab4382d2SGreg Kroah-Hartman { 621ab4382d2SGreg Kroah-Hartman up->lcr = serial_in(up, UART_LCR); 622ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 623ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 624ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); 625ab4382d2SGreg Kroah-Hartman 626ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XON1, termios->c_cc[VSTART]); 627ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 628ab4382d2SGreg Kroah-Hartman 629ab4382d2SGreg Kroah-Hartman /* clear SW control mode bits */ 630c538d20cSGovindraj.R up->efr &= OMAP_UART_SW_CLR; 631ab4382d2SGreg Kroah-Hartman 632ab4382d2SGreg Kroah-Hartman /* 633ab4382d2SGreg Kroah-Hartman * IXON Flag: 634ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 635ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 636ab4382d2SGreg Kroah-Hartman */ 637ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 638c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_TX; 639ab4382d2SGreg Kroah-Hartman 640ab4382d2SGreg Kroah-Hartman /* 641ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 642ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 643ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 644ab4382d2SGreg Kroah-Hartman */ 645ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 646c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_RX; 647ab4382d2SGreg Kroah-Hartman 648ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 649ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 650ab4382d2SGreg Kroah-Hartman 651ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 652ab4382d2SGreg Kroah-Hartman 653ab4382d2SGreg Kroah-Hartman /* 654ab4382d2SGreg Kroah-Hartman * IXANY Flag: 655ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 656ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 657ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 658ab4382d2SGreg Kroah-Hartman */ 659ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 660ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 661ab4382d2SGreg Kroah-Hartman 662ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 663ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 664ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 665ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 666ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 667ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 668ab4382d2SGreg Kroah-Hartman */ 669c538d20cSGovindraj.R serial_out(up, UART_EFR, up->efr | UART_EFR_SCD); 670ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 671ab4382d2SGreg Kroah-Hartman 672ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 673ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 674ab4382d2SGreg Kroah-Hartman } 675ab4382d2SGreg Kroah-Hartman 676ab4382d2SGreg Kroah-Hartman static void 677ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 678ab4382d2SGreg Kroah-Hartman struct ktermios *old) 679ab4382d2SGreg Kroah-Hartman { 680ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 681ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 682ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 683ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 684ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 685ab4382d2SGreg Kroah-Hartman 686ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 687ab4382d2SGreg Kroah-Hartman case CS5: 688ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 689ab4382d2SGreg Kroah-Hartman break; 690ab4382d2SGreg Kroah-Hartman case CS6: 691ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 692ab4382d2SGreg Kroah-Hartman break; 693ab4382d2SGreg Kroah-Hartman case CS7: 694ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 695ab4382d2SGreg Kroah-Hartman break; 696ab4382d2SGreg Kroah-Hartman default: 697ab4382d2SGreg Kroah-Hartman case CS8: 698ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 699ab4382d2SGreg Kroah-Hartman break; 700ab4382d2SGreg Kroah-Hartman } 701ab4382d2SGreg Kroah-Hartman 702ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 703ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 704ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 705ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 706ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 707ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 708ab4382d2SGreg Kroah-Hartman 709ab4382d2SGreg Kroah-Hartman /* 710ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 711ab4382d2SGreg Kroah-Hartman */ 712ab4382d2SGreg Kroah-Hartman 713ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 714ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 715ab4382d2SGreg Kroah-Hartman 716c538d20cSGovindraj.R up->dll = quot & 0xff; 717c538d20cSGovindraj.R up->dlh = quot >> 8; 718c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_DISABLE; 719c538d20cSGovindraj.R 720ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 721ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 722ab4382d2SGreg Kroah-Hartman if (up->use_dma) 723ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 724ab4382d2SGreg Kroah-Hartman 725ab4382d2SGreg Kroah-Hartman /* 726ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 727ab4382d2SGreg Kroah-Hartman * interrupts disabled. 728ab4382d2SGreg Kroah-Hartman */ 729fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 730ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 731ab4382d2SGreg Kroah-Hartman 732ab4382d2SGreg Kroah-Hartman /* 733ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 734ab4382d2SGreg Kroah-Hartman */ 735ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 736ab4382d2SGreg Kroah-Hartman 737ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 738ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 739ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 740ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 741ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 742ab4382d2SGreg Kroah-Hartman 743ab4382d2SGreg Kroah-Hartman /* 744ab4382d2SGreg Kroah-Hartman * Characters to ignore 745ab4382d2SGreg Kroah-Hartman */ 746ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 747ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 748ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 749ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 750ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 751ab4382d2SGreg Kroah-Hartman /* 752ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 753ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 754ab4382d2SGreg Kroah-Hartman */ 755ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 756ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 757ab4382d2SGreg Kroah-Hartman } 758ab4382d2SGreg Kroah-Hartman 759ab4382d2SGreg Kroah-Hartman /* 760ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 761ab4382d2SGreg Kroah-Hartman */ 762ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 763ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 764ab4382d2SGreg Kroah-Hartman 765ab4382d2SGreg Kroah-Hartman /* 766ab4382d2SGreg Kroah-Hartman * Modem status interrupts 767ab4382d2SGreg Kroah-Hartman */ 768ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 769ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 770ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 771ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 772ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 773c538d20cSGovindraj.R up->lcr = cval; 77432212897SGovindraj.R up->scr = OMAP_UART_SCR_TX_EMPTY; 775ab4382d2SGreg Kroah-Hartman 776ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 777ab4382d2SGreg Kroah-Hartman 778ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 779ab4382d2SGreg Kroah-Hartman * baud clock is not running 780ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 781ab4382d2SGreg Kroah-Hartman */ 782ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 783ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 784ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 785ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 786ab4382d2SGreg Kroah-Hartman 787ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 788ab4382d2SGreg Kroah-Hartman 789ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 790ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 791ab4382d2SGreg Kroah-Hartman 792ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 793ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 794ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 795ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 796ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, up->fcr); 797ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 798ab4382d2SGreg Kroah-Hartman 799ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 800ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TLR, 0); 801c538d20cSGovindraj.R up->scr |= (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8); 802ab4382d2SGreg Kroah-Hartman } 803ab4382d2SGreg Kroah-Hartman 804c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 805c538d20cSGovindraj.R 806ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 807ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 808ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 809ab4382d2SGreg Kroah-Hartman 810ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 811ab4382d2SGreg Kroah-Hartman 81294734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 81394734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 81494734749SGovindraj.R else 815c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 81694734749SGovindraj.R 817ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 818ab4382d2SGreg Kroah-Hartman 819ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 820ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 821ab4382d2SGreg Kroah-Hartman 822ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 823ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 824ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 825ab4382d2SGreg Kroah-Hartman 826c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 827c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 828ab4382d2SGreg Kroah-Hartman 829ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 830ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 831ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 832ab4382d2SGreg Kroah-Hartman 833ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 834ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 835ab4382d2SGreg Kroah-Hartman 836ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 837c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_13X_MODE; 838ab4382d2SGreg Kroah-Hartman else 839c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_16X_MODE; 840c538d20cSGovindraj.R 84194734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 84294734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 84394734749SGovindraj.R else 844c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 845ab4382d2SGreg Kroah-Hartman 846ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 847ab4382d2SGreg Kroah-Hartman 848ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 849ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 850ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 851ab4382d2SGreg Kroah-Hartman 852ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 853ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 856ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 857ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 858ab4382d2SGreg Kroah-Hartman 859ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 860ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 861ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 862ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 863ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 864ab4382d2SGreg Kroah-Hartman } 865ab4382d2SGreg Kroah-Hartman 866ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 867ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 868ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 869ab4382d2SGreg Kroah-Hartman 870ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 871fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 872ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id); 873ab4382d2SGreg Kroah-Hartman } 874ab4382d2SGreg Kroah-Hartman 875ab4382d2SGreg Kroah-Hartman static void 876ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 877ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 878ab4382d2SGreg Kroah-Hartman { 879ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 880ab4382d2SGreg Kroah-Hartman unsigned char efr; 881ab4382d2SGreg Kroah-Hartman 882ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id); 883fcdca757SGovindraj.R 884fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 885ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 886ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 887ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 888ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 889ab4382d2SGreg Kroah-Hartman 890ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 891ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 892ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 893ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 894fcdca757SGovindraj.R 895fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 896fcdca757SGovindraj.R if (!state) 897fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 898fcdca757SGovindraj.R else 899fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 900fcdca757SGovindraj.R } 901fcdca757SGovindraj.R 902fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 903ab4382d2SGreg Kroah-Hartman } 904ab4382d2SGreg Kroah-Hartman 905ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 906ab4382d2SGreg Kroah-Hartman { 907ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 908ab4382d2SGreg Kroah-Hartman } 909ab4382d2SGreg Kroah-Hartman 910ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 911ab4382d2SGreg Kroah-Hartman { 912ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 913ab4382d2SGreg Kroah-Hartman return 0; 914ab4382d2SGreg Kroah-Hartman } 915ab4382d2SGreg Kroah-Hartman 916ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 917ab4382d2SGreg Kroah-Hartman { 918ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 919ab4382d2SGreg Kroah-Hartman 920ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 921ab4382d2SGreg Kroah-Hartman up->pdev->id); 922ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 923ab4382d2SGreg Kroah-Hartman } 924ab4382d2SGreg Kroah-Hartman 925ab4382d2SGreg Kroah-Hartman static int 926ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 927ab4382d2SGreg Kroah-Hartman { 928ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 929ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 930ab4382d2SGreg Kroah-Hartman return -EINVAL; 931ab4382d2SGreg Kroah-Hartman } 932ab4382d2SGreg Kroah-Hartman 933ab4382d2SGreg Kroah-Hartman static const char * 934ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 935ab4382d2SGreg Kroah-Hartman { 936ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 937ab4382d2SGreg Kroah-Hartman 938ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id); 939ab4382d2SGreg Kroah-Hartman return up->name; 940ab4382d2SGreg Kroah-Hartman } 941ab4382d2SGreg Kroah-Hartman 942ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 943ab4382d2SGreg Kroah-Hartman 944ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 945ab4382d2SGreg Kroah-Hartman { 946ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 947ab4382d2SGreg Kroah-Hartman 948ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 949ab4382d2SGreg Kroah-Hartman do { 950ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 951ab4382d2SGreg Kroah-Hartman 952ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 953ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 956ab4382d2SGreg Kroah-Hartman break; 957ab4382d2SGreg Kroah-Hartman udelay(1); 958ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 959ab4382d2SGreg Kroah-Hartman 960ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 961ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 962ab4382d2SGreg Kroah-Hartman tmout = 1000000; 963ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 964ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 965ab4382d2SGreg Kroah-Hartman 966ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 967ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 968ab4382d2SGreg Kroah-Hartman break; 969ab4382d2SGreg Kroah-Hartman 970ab4382d2SGreg Kroah-Hartman udelay(1); 971ab4382d2SGreg Kroah-Hartman } 972ab4382d2SGreg Kroah-Hartman } 973ab4382d2SGreg Kroah-Hartman } 974ab4382d2SGreg Kroah-Hartman 975ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 976ab4382d2SGreg Kroah-Hartman 977ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 978ab4382d2SGreg Kroah-Hartman { 979ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 980fcdca757SGovindraj.R 981fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 982ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 983ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 984fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 985ab4382d2SGreg Kroah-Hartman } 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 988ab4382d2SGreg Kroah-Hartman { 989ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 990fcdca757SGovindraj.R unsigned int status; 991ab4382d2SGreg Kroah-Hartman 992fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 993fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 994ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 995ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 996ab4382d2SGreg Kroah-Hartman 997fcdca757SGovindraj.R status = serial_in(up, UART_RX); 998fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 999fcdca757SGovindraj.R return status; 1000ab4382d2SGreg Kroah-Hartman } 1001ab4382d2SGreg Kroah-Hartman 1002ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 1003ab4382d2SGreg Kroah-Hartman 1004ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1005ab4382d2SGreg Kroah-Hartman 1006ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 1007ab4382d2SGreg Kroah-Hartman 1008ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 1009ab4382d2SGreg Kroah-Hartman 1010ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 1011ab4382d2SGreg Kroah-Hartman { 1012ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1013ab4382d2SGreg Kroah-Hartman 1014ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1015ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1016ab4382d2SGreg Kroah-Hartman } 1017ab4382d2SGreg Kroah-Hartman 1018ab4382d2SGreg Kroah-Hartman static void 1019ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1020ab4382d2SGreg Kroah-Hartman unsigned int count) 1021ab4382d2SGreg Kroah-Hartman { 1022ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1023ab4382d2SGreg Kroah-Hartman unsigned long flags; 1024ab4382d2SGreg Kroah-Hartman unsigned int ier; 1025ab4382d2SGreg Kroah-Hartman int locked = 1; 1026ab4382d2SGreg Kroah-Hartman 1027fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1028fcdca757SGovindraj.R 1029ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1030ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1031ab4382d2SGreg Kroah-Hartman locked = 0; 1032ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1033ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1034ab4382d2SGreg Kroah-Hartman else 1035ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1036ab4382d2SGreg Kroah-Hartman 1037ab4382d2SGreg Kroah-Hartman /* 1038ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1039ab4382d2SGreg Kroah-Hartman */ 1040ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1041ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1044ab4382d2SGreg Kroah-Hartman 1045ab4382d2SGreg Kroah-Hartman /* 1046ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1047ab4382d2SGreg Kroah-Hartman * and restore the IER 1048ab4382d2SGreg Kroah-Hartman */ 1049ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1050ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1051ab4382d2SGreg Kroah-Hartman /* 1052ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1053ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1054ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1055ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1056ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1057ab4382d2SGreg Kroah-Hartman */ 1058ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1059ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1060ab4382d2SGreg Kroah-Hartman 1061fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1062fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1063ab4382d2SGreg Kroah-Hartman if (locked) 1064ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1065ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1066ab4382d2SGreg Kroah-Hartman } 1067ab4382d2SGreg Kroah-Hartman 1068ab4382d2SGreg Kroah-Hartman static int __init 1069ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1070ab4382d2SGreg Kroah-Hartman { 1071ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1072ab4382d2SGreg Kroah-Hartman int baud = 115200; 1073ab4382d2SGreg Kroah-Hartman int bits = 8; 1074ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1075ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1076ab4382d2SGreg Kroah-Hartman 1077ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1078ab4382d2SGreg Kroah-Hartman return -ENODEV; 1079ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1080ab4382d2SGreg Kroah-Hartman 1081ab4382d2SGreg Kroah-Hartman if (options) 1082ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1083ab4382d2SGreg Kroah-Hartman 1084ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1085ab4382d2SGreg Kroah-Hartman } 1086ab4382d2SGreg Kroah-Hartman 1087ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1088ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1089ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1090ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1091ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1092ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1093ab4382d2SGreg Kroah-Hartman .index = -1, 1094ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1095ab4382d2SGreg Kroah-Hartman }; 1096ab4382d2SGreg Kroah-Hartman 1097ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1098ab4382d2SGreg Kroah-Hartman { 1099ab4382d2SGreg Kroah-Hartman serial_omap_console_ports[up->pdev->id] = up; 1100ab4382d2SGreg Kroah-Hartman } 1101ab4382d2SGreg Kroah-Hartman 1102ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman #else 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1107ab4382d2SGreg Kroah-Hartman 1108ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1109ab4382d2SGreg Kroah-Hartman {} 1110ab4382d2SGreg Kroah-Hartman 1111ab4382d2SGreg Kroah-Hartman #endif 1112ab4382d2SGreg Kroah-Hartman 1113ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1114ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1115ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1116ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1117ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1118ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1119ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1120ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1121ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1122ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1123ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1124ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1125ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1126ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1127ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1128ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1129ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1130ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1131ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1132ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1133ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1134ab4382d2SGreg Kroah-Hartman #endif 1135ab4382d2SGreg Kroah-Hartman }; 1136ab4382d2SGreg Kroah-Hartman 1137ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1138ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1139ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1140ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1141ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1142ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1143ab4382d2SGreg Kroah-Hartman }; 1144ab4382d2SGreg Kroah-Hartman 1145fcdca757SGovindraj.R #ifdef CONFIG_SUSPEND 1146fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1147ab4382d2SGreg Kroah-Hartman { 1148fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman if (up) 1151ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 1152ab4382d2SGreg Kroah-Hartman return 0; 1153ab4382d2SGreg Kroah-Hartman } 1154ab4382d2SGreg Kroah-Hartman 1155fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1156ab4382d2SGreg Kroah-Hartman { 1157fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1158ab4382d2SGreg Kroah-Hartman 1159ab4382d2SGreg Kroah-Hartman if (up) 1160ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1161ab4382d2SGreg Kroah-Hartman return 0; 1162ab4382d2SGreg Kroah-Hartman } 1163fcdca757SGovindraj.R #endif 1164ab4382d2SGreg Kroah-Hartman 1165ab4382d2SGreg Kroah-Hartman static void serial_omap_rx_timeout(unsigned long uart_no) 1166ab4382d2SGreg Kroah-Hartman { 1167ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1168ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1169ab4382d2SGreg Kroah-Hartman int ret = 0; 1170ab4382d2SGreg Kroah-Hartman 1171ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1172ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1173ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1174ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1175ab4382d2SGreg Kroah-Hartman RX_TIMEOUT) { 1176ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1177ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1178ab4382d2SGreg Kroah-Hartman } else { 1179ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1180ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1181ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1182ab4382d2SGreg Kroah-Hartman } 1183ab4382d2SGreg Kroah-Hartman return; 1184ab4382d2SGreg Kroah-Hartman } 1185ab4382d2SGreg Kroah-Hartman 1186ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1187ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1188ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1189ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1190ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1191ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1192ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1193ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1194ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1195ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1196ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1197ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1198ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1199ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1200ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1201ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1202ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1203ab4382d2SGreg Kroah-Hartman } 1204ab4382d2SGreg Kroah-Hartman } else { 1205ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1206ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1207ab4382d2SGreg Kroah-Hartman } 1208ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1209ab4382d2SGreg Kroah-Hartman } 1210ab4382d2SGreg Kroah-Hartman 1211ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1212ab4382d2SGreg Kroah-Hartman { 1213ab4382d2SGreg Kroah-Hartman return; 1214ab4382d2SGreg Kroah-Hartman } 1215ab4382d2SGreg Kroah-Hartman 1216ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1217ab4382d2SGreg Kroah-Hartman { 1218ab4382d2SGreg Kroah-Hartman int ret = 0; 1219ab4382d2SGreg Kroah-Hartman 1220ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1221fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1222ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1223ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1224ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1225ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1226ab4382d2SGreg Kroah-Hartman if (ret < 0) 1227ab4382d2SGreg Kroah-Hartman return ret; 1228ab4382d2SGreg Kroah-Hartman 1229ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1230ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1231ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1232ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1233ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1234ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1235ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1236ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1237ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1238ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1239ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1240ab4382d2SGreg Kroah-Hartman } 1241ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1242ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1243ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1244ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1245ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1246ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1247ab4382d2SGreg Kroah-Hartman return ret; 1248ab4382d2SGreg Kroah-Hartman } 1249ab4382d2SGreg Kroah-Hartman 1250ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1251ab4382d2SGreg Kroah-Hartman { 1252ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1253ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1254ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1255ab4382d2SGreg Kroah-Hartman 1256ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1257ab4382d2SGreg Kroah-Hartman return; 1258ab4382d2SGreg Kroah-Hartman 1259ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1260ab4382d2SGreg Kroah-Hartman /* 1261ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1262ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1263ab4382d2SGreg Kroah-Hartman * transfers 1264ab4382d2SGreg Kroah-Hartman */ 1265ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1266ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1267ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1268ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1269ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1270ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1271ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1272ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1273ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1274ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1275ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1276ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1277ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1278ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1279ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1280ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1281ab4382d2SGreg Kroah-Hartman } 1282ab4382d2SGreg Kroah-Hartman 1283ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1284ab4382d2SGreg Kroah-Hartman { 1285ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1286ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1287ab4382d2SGreg Kroah-Hartman 1288ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1289ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1290ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1291ab4382d2SGreg Kroah-Hartman 1292ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1293ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1294ab4382d2SGreg Kroah-Hartman 1295ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1296ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1297ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1298ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1299ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1300ab4382d2SGreg Kroah-Hartman } else { 1301ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1302ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1303ab4382d2SGreg Kroah-Hartman } 1304ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1305ab4382d2SGreg Kroah-Hartman return; 1306ab4382d2SGreg Kroah-Hartman } 1307ab4382d2SGreg Kroah-Hartman 1308ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1309ab4382d2SGreg Kroah-Hartman { 1310ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1311ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1312ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1313ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1314ab4382d2SGreg Kroah-Hartman 1315ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1316ab4382d2SGreg Kroah-Hartman if (!mem) { 1317ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1318ab4382d2SGreg Kroah-Hartman return -ENODEV; 1319ab4382d2SGreg Kroah-Hartman } 1320ab4382d2SGreg Kroah-Hartman 1321ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1322ab4382d2SGreg Kroah-Hartman if (!irq) { 1323ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1324ab4382d2SGreg Kroah-Hartman return -ENODEV; 1325ab4382d2SGreg Kroah-Hartman } 1326ab4382d2SGreg Kroah-Hartman 132728f65c11SJoe Perches if (!request_mem_region(mem->start, resource_size(mem), 1328ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1329ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1330ab4382d2SGreg Kroah-Hartman return -EBUSY; 1331ab4382d2SGreg Kroah-Hartman } 1332ab4382d2SGreg Kroah-Hartman 1333ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1334ab4382d2SGreg Kroah-Hartman if (!dma_rx) { 1335ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1336ab4382d2SGreg Kroah-Hartman goto err; 1337ab4382d2SGreg Kroah-Hartman } 1338ab4382d2SGreg Kroah-Hartman 1339ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1340ab4382d2SGreg Kroah-Hartman if (!dma_tx) { 1341ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1342ab4382d2SGreg Kroah-Hartman goto err; 1343ab4382d2SGreg Kroah-Hartman } 1344ab4382d2SGreg Kroah-Hartman 1345ab4382d2SGreg Kroah-Hartman up = kzalloc(sizeof(*up), GFP_KERNEL); 1346ab4382d2SGreg Kroah-Hartman if (up == NULL) { 1347ab4382d2SGreg Kroah-Hartman ret = -ENOMEM; 1348ab4382d2SGreg Kroah-Hartman goto do_release_region; 1349ab4382d2SGreg Kroah-Hartman } 1350ab4382d2SGreg Kroah-Hartman sprintf(up->name, "OMAP UART%d", pdev->id); 1351ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1352ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1353ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1354ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1355ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1356ab4382d2SGreg Kroah-Hartman 1357ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1358ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1359ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1360ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1361ab4382d2SGreg Kroah-Hartman 1362edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1363edd70ad7SGovindraj.R up->port.membase = ioremap(mem->start, resource_size(mem)); 1364edd70ad7SGovindraj.R if (!up->port.membase) { 1365edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1366edd70ad7SGovindraj.R ret = -ENOMEM; 1367edd70ad7SGovindraj.R goto err; 1368edd70ad7SGovindraj.R } 1369edd70ad7SGovindraj.R 1370ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1371ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 1372ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 137394734749SGovindraj.R up->errata = omap_up_info->errata; 1374ab4382d2SGreg Kroah-Hartman 1375ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1376ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1377ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1378ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1379ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size = 4096; 1380ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timeout = 2; 1381ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1382ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1383ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1384ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1385ab4382d2SGreg Kroah-Hartman } 1386ab4382d2SGreg Kroah-Hartman 1387fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1388fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1389fcdca757SGovindraj.R OMAP_UART_AUTOSUSPEND_DELAY); 1390fcdca757SGovindraj.R 1391fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1392fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1393fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1394fcdca757SGovindraj.R 1395ab4382d2SGreg Kroah-Hartman ui[pdev->id] = up; 1396ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1397ab4382d2SGreg Kroah-Hartman 1398ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1399ab4382d2SGreg Kroah-Hartman if (ret != 0) 1400ab4382d2SGreg Kroah-Hartman goto do_release_region; 1401ab4382d2SGreg Kroah-Hartman 1402fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1403ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1404ab4382d2SGreg Kroah-Hartman return 0; 1405ab4382d2SGreg Kroah-Hartman err: 1406ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1407ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1408ab4382d2SGreg Kroah-Hartman do_release_region: 140928f65c11SJoe Perches release_mem_region(mem->start, resource_size(mem)); 1410ab4382d2SGreg Kroah-Hartman return ret; 1411ab4382d2SGreg Kroah-Hartman } 1412ab4382d2SGreg Kroah-Hartman 1413ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1414ab4382d2SGreg Kroah-Hartman { 1415ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1416ab4382d2SGreg Kroah-Hartman 1417ab4382d2SGreg Kroah-Hartman if (up) { 1418fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1419ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 1420ab4382d2SGreg Kroah-Hartman kfree(up); 1421ab4382d2SGreg Kroah-Hartman } 1422fcdca757SGovindraj.R 1423fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1424ab4382d2SGreg Kroah-Hartman return 0; 1425ab4382d2SGreg Kroah-Hartman } 1426ab4382d2SGreg Kroah-Hartman 142794734749SGovindraj.R /* 142894734749SGovindraj.R * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 142994734749SGovindraj.R * The access to uart register after MDR1 Access 143094734749SGovindraj.R * causes UART to corrupt data. 143194734749SGovindraj.R * 143294734749SGovindraj.R * Need a delay = 143394734749SGovindraj.R * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 143494734749SGovindraj.R * give 10 times as much 143594734749SGovindraj.R */ 143694734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 143794734749SGovindraj.R { 143894734749SGovindraj.R u8 timeout = 255; 143994734749SGovindraj.R 144094734749SGovindraj.R serial_out(up, UART_OMAP_MDR1, mdr1); 144194734749SGovindraj.R udelay(2); 144294734749SGovindraj.R serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 144394734749SGovindraj.R UART_FCR_CLEAR_RCVR); 144494734749SGovindraj.R /* 144594734749SGovindraj.R * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 144694734749SGovindraj.R * TX_FIFO_E bit is 1. 144794734749SGovindraj.R */ 144894734749SGovindraj.R while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 144994734749SGovindraj.R (UART_LSR_THRE | UART_LSR_DR))) { 145094734749SGovindraj.R timeout--; 145194734749SGovindraj.R if (!timeout) { 145294734749SGovindraj.R /* Should *never* happen. we warn and carry on */ 145394734749SGovindraj.R dev_crit(&up->pdev->dev, "Errata i202: timedout %x\n", 145494734749SGovindraj.R serial_in(up, UART_LSR)); 145594734749SGovindraj.R break; 145694734749SGovindraj.R } 145794734749SGovindraj.R udelay(1); 145894734749SGovindraj.R } 145994734749SGovindraj.R } 146094734749SGovindraj.R 14619f9ac1e8SGovindraj.R static void serial_omap_restore_context(struct uart_omap_port *up) 14629f9ac1e8SGovindraj.R { 146394734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 146494734749SGovindraj.R serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 146594734749SGovindraj.R else 14669f9ac1e8SGovindraj.R serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 146794734749SGovindraj.R 14689f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 14699f9ac1e8SGovindraj.R serial_out(up, UART_EFR, UART_EFR_ECB); 14709f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 14719f9ac1e8SGovindraj.R serial_out(up, UART_IER, 0x0); 14729f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1473c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); 1474c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); 14759f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 14769f9ac1e8SGovindraj.R serial_out(up, UART_IER, up->ier); 14779f9ac1e8SGovindraj.R serial_out(up, UART_FCR, up->fcr); 14789f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 14799f9ac1e8SGovindraj.R serial_out(up, UART_MCR, up->mcr); 14809f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1481c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 14829f9ac1e8SGovindraj.R serial_out(up, UART_EFR, up->efr); 14839f9ac1e8SGovindraj.R serial_out(up, UART_LCR, up->lcr); 148494734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 148594734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 148694734749SGovindraj.R else 1487c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 14889f9ac1e8SGovindraj.R } 14899f9ac1e8SGovindraj.R 1490fcdca757SGovindraj.R #ifdef CONFIG_PM_RUNTIME 1491fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1492fcdca757SGovindraj.R { 1493ec3bebc6SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1494ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 1495ec3bebc6SGovindraj.R 1496ec3bebc6SGovindraj.R if (!up) 1497ec3bebc6SGovindraj.R return -EINVAL; 1498ec3bebc6SGovindraj.R 1499ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) 1500ec3bebc6SGovindraj.R up->context_loss_cnt = pdata->get_context_loss_count(dev); 1501ec3bebc6SGovindraj.R 150294734749SGovindraj.R /* Errata i291 */ 150394734749SGovindraj.R if (up->use_dma && pdata->set_forceidle && 150494734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 150594734749SGovindraj.R pdata->set_forceidle(up->pdev); 150694734749SGovindraj.R 1507fcdca757SGovindraj.R return 0; 1508fcdca757SGovindraj.R } 1509fcdca757SGovindraj.R 1510fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1511fcdca757SGovindraj.R { 15129f9ac1e8SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1513ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 15149f9ac1e8SGovindraj.R 1515ec3bebc6SGovindraj.R if (up) { 1516ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) { 1517ec3bebc6SGovindraj.R u32 loss_cnt = pdata->get_context_loss_count(dev); 1518ec3bebc6SGovindraj.R 1519ec3bebc6SGovindraj.R if (up->context_loss_cnt != loss_cnt) 15209f9ac1e8SGovindraj.R serial_omap_restore_context(up); 1521ec3bebc6SGovindraj.R } 152294734749SGovindraj.R 152394734749SGovindraj.R /* Errata i291 */ 152494734749SGovindraj.R if (up->use_dma && pdata->set_noidle && 152594734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 152694734749SGovindraj.R pdata->set_noidle(up->pdev); 1527ec3bebc6SGovindraj.R } 15289f9ac1e8SGovindraj.R 1529fcdca757SGovindraj.R return 0; 1530fcdca757SGovindraj.R } 1531fcdca757SGovindraj.R #endif 1532fcdca757SGovindraj.R 1533fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1534fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1535fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1536fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1537fcdca757SGovindraj.R }; 1538fcdca757SGovindraj.R 1539ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1540ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1541ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1542ab4382d2SGreg Kroah-Hartman .driver = { 1543ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1544fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1545ab4382d2SGreg Kroah-Hartman }, 1546ab4382d2SGreg Kroah-Hartman }; 1547ab4382d2SGreg Kroah-Hartman 1548ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1549ab4382d2SGreg Kroah-Hartman { 1550ab4382d2SGreg Kroah-Hartman int ret; 1551ab4382d2SGreg Kroah-Hartman 1552ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1553ab4382d2SGreg Kroah-Hartman if (ret != 0) 1554ab4382d2SGreg Kroah-Hartman return ret; 1555ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1556ab4382d2SGreg Kroah-Hartman if (ret != 0) 1557ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1558ab4382d2SGreg Kroah-Hartman return ret; 1559ab4382d2SGreg Kroah-Hartman } 1560ab4382d2SGreg Kroah-Hartman 1561ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1562ab4382d2SGreg Kroah-Hartman { 1563ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1564ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1565ab4382d2SGreg Kroah-Hartman } 1566ab4382d2SGreg Kroah-Hartman 1567ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1568ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1569ab4382d2SGreg Kroah-Hartman 1570ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1571ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1572ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1573