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 46ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 47ab4382d2SGreg Kroah-Hartman 48ab4382d2SGreg Kroah-Hartman /* Forward declaration of functions */ 49ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data); 50a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no); 51ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up); 5294734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 53ab4382d2SGreg Kroah-Hartman 54ab4382d2SGreg Kroah-Hartman static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 55ab4382d2SGreg Kroah-Hartman { 56ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 57ab4382d2SGreg Kroah-Hartman return readw(up->port.membase + offset); 58ab4382d2SGreg Kroah-Hartman } 59ab4382d2SGreg Kroah-Hartman 60ab4382d2SGreg Kroah-Hartman static inline void serial_out(struct uart_omap_port *up, int offset, int value) 61ab4382d2SGreg Kroah-Hartman { 62ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 63ab4382d2SGreg Kroah-Hartman writew(value, up->port.membase + offset); 64ab4382d2SGreg Kroah-Hartman } 65ab4382d2SGreg Kroah-Hartman 66ab4382d2SGreg Kroah-Hartman static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 67ab4382d2SGreg Kroah-Hartman { 68ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 69ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 70ab4382d2SGreg Kroah-Hartman UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 71ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, 0); 72ab4382d2SGreg Kroah-Hartman } 73ab4382d2SGreg Kroah-Hartman 74ab4382d2SGreg Kroah-Hartman /* 75ab4382d2SGreg Kroah-Hartman * serial_omap_get_divisor - calculate divisor value 76ab4382d2SGreg Kroah-Hartman * @port: uart port info 77ab4382d2SGreg Kroah-Hartman * @baud: baudrate for which divisor needs to be calculated. 78ab4382d2SGreg Kroah-Hartman * 79ab4382d2SGreg Kroah-Hartman * We have written our own function to get the divisor so as to support 80ab4382d2SGreg Kroah-Hartman * 13x mode. 3Mbps Baudrate as an different divisor. 81ab4382d2SGreg Kroah-Hartman * Reference OMAP TRM Chapter 17: 82ab4382d2SGreg Kroah-Hartman * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates 83ab4382d2SGreg Kroah-Hartman * referring to oversampling - divisor value 84ab4382d2SGreg Kroah-Hartman * baudrate 460,800 to 3,686,400 all have divisor 13 85ab4382d2SGreg Kroah-Hartman * except 3,000,000 which has divisor value 16 86ab4382d2SGreg Kroah-Hartman */ 87ab4382d2SGreg Kroah-Hartman static unsigned int 88ab4382d2SGreg Kroah-Hartman serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 89ab4382d2SGreg Kroah-Hartman { 90ab4382d2SGreg Kroah-Hartman unsigned int divisor; 91ab4382d2SGreg Kroah-Hartman 92ab4382d2SGreg Kroah-Hartman if (baud > OMAP_MODE13X_SPEED && baud != 3000000) 93ab4382d2SGreg Kroah-Hartman divisor = 13; 94ab4382d2SGreg Kroah-Hartman else 95ab4382d2SGreg Kroah-Hartman divisor = 16; 96ab4382d2SGreg Kroah-Hartman return port->uartclk/(baud * divisor); 97ab4382d2SGreg Kroah-Hartman } 98ab4382d2SGreg Kroah-Hartman 99ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rxdma(struct uart_omap_port *up) 100ab4382d2SGreg Kroah-Hartman { 101ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_used) { 102ab4382d2SGreg Kroah-Hartman del_timer(&up->uart_dma.rx_timer); 103ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.rx_dma_channel); 104ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.rx_dma_channel); 105ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 106ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = false; 107fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 108fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 109ab4382d2SGreg Kroah-Hartman } 110ab4382d2SGreg Kroah-Hartman } 111ab4382d2SGreg Kroah-Hartman 112ab4382d2SGreg Kroah-Hartman static void serial_omap_enable_ms(struct uart_port *port) 113ab4382d2SGreg Kroah-Hartman { 114ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 115ab4382d2SGreg Kroah-Hartman 116ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id); 117fcdca757SGovindraj.R 118fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 119ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 120ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 121fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 122ab4382d2SGreg Kroah-Hartman } 123ab4382d2SGreg Kroah-Hartman 124ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_tx(struct uart_port *port) 125ab4382d2SGreg Kroah-Hartman { 126ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 127ab4382d2SGreg Kroah-Hartman 128ab4382d2SGreg Kroah-Hartman if (up->use_dma && 129ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { 130ab4382d2SGreg Kroah-Hartman /* 131ab4382d2SGreg Kroah-Hartman * Check if dma is still active. If yes do nothing, 132ab4382d2SGreg Kroah-Hartman * return. Else stop dma 133ab4382d2SGreg Kroah-Hartman */ 134ab4382d2SGreg Kroah-Hartman if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel)) 135ab4382d2SGreg Kroah-Hartman return; 136ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 137ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.tx_dma_channel); 138ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 139fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 140fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 141ab4382d2SGreg Kroah-Hartman } 142ab4382d2SGreg Kroah-Hartman 143fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 144ab4382d2SGreg Kroah-Hartman if (up->ier & UART_IER_THRI) { 145ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_THRI; 146ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 147ab4382d2SGreg Kroah-Hartman } 148fcdca757SGovindraj.R 149fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 150fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 151ab4382d2SGreg Kroah-Hartman } 152ab4382d2SGreg Kroah-Hartman 153ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rx(struct uart_port *port) 154ab4382d2SGreg Kroah-Hartman { 155ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 156ab4382d2SGreg Kroah-Hartman 157fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 158ab4382d2SGreg Kroah-Hartman if (up->use_dma) 159ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 160ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_RLSI; 161ab4382d2SGreg Kroah-Hartman up->port.read_status_mask &= ~UART_LSR_DR; 162ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 163fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 164fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 165ab4382d2SGreg Kroah-Hartman } 166ab4382d2SGreg Kroah-Hartman 167ab4382d2SGreg Kroah-Hartman static inline void receive_chars(struct uart_omap_port *up, int *status) 168ab4382d2SGreg Kroah-Hartman { 169ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = up->port.state->port.tty; 170ab4382d2SGreg Kroah-Hartman unsigned int flag; 171ab4382d2SGreg Kroah-Hartman unsigned char ch, lsr = *status; 172ab4382d2SGreg Kroah-Hartman int max_count = 256; 173ab4382d2SGreg Kroah-Hartman 174ab4382d2SGreg Kroah-Hartman do { 175ab4382d2SGreg Kroah-Hartman if (likely(lsr & UART_LSR_DR)) 176ab4382d2SGreg Kroah-Hartman ch = serial_in(up, UART_RX); 177ab4382d2SGreg Kroah-Hartman flag = TTY_NORMAL; 178ab4382d2SGreg Kroah-Hartman up->port.icount.rx++; 179ab4382d2SGreg Kroah-Hartman 180ab4382d2SGreg Kroah-Hartman if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 181ab4382d2SGreg Kroah-Hartman /* 182ab4382d2SGreg Kroah-Hartman * For statistics only 183ab4382d2SGreg Kroah-Hartman */ 184ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) { 185ab4382d2SGreg Kroah-Hartman lsr &= ~(UART_LSR_FE | UART_LSR_PE); 186ab4382d2SGreg Kroah-Hartman up->port.icount.brk++; 187ab4382d2SGreg Kroah-Hartman /* 188ab4382d2SGreg Kroah-Hartman * We do the SysRQ and SAK checking 189ab4382d2SGreg Kroah-Hartman * here because otherwise the break 190ab4382d2SGreg Kroah-Hartman * may get masked by ignore_status_mask 191ab4382d2SGreg Kroah-Hartman * or read_status_mask. 192ab4382d2SGreg Kroah-Hartman */ 193ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&up->port)) 194ab4382d2SGreg Kroah-Hartman goto ignore_char; 195ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_PE) { 196ab4382d2SGreg Kroah-Hartman up->port.icount.parity++; 197ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_FE) { 198ab4382d2SGreg Kroah-Hartman up->port.icount.frame++; 199ab4382d2SGreg Kroah-Hartman } 200ab4382d2SGreg Kroah-Hartman 201ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_OE) 202ab4382d2SGreg Kroah-Hartman up->port.icount.overrun++; 203ab4382d2SGreg Kroah-Hartman 204ab4382d2SGreg Kroah-Hartman /* 205ab4382d2SGreg Kroah-Hartman * Mask off conditions which should be ignored. 206ab4382d2SGreg Kroah-Hartman */ 207ab4382d2SGreg Kroah-Hartman lsr &= up->port.read_status_mask; 208ab4382d2SGreg Kroah-Hartman 209ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 210ab4382d2SGreg Kroah-Hartman if (up->port.line == up->port.cons->index) { 211ab4382d2SGreg Kroah-Hartman /* Recover the break flag from console xmit */ 212ab4382d2SGreg Kroah-Hartman lsr |= up->lsr_break_flag; 213ab4382d2SGreg Kroah-Hartman } 214ab4382d2SGreg Kroah-Hartman #endif 215ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) 216ab4382d2SGreg Kroah-Hartman flag = TTY_BREAK; 217ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_PE) 218ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 219ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_FE) 220ab4382d2SGreg Kroah-Hartman flag = TTY_FRAME; 221ab4382d2SGreg Kroah-Hartman } 222ab4382d2SGreg Kroah-Hartman 223ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&up->port, ch)) 224ab4382d2SGreg Kroah-Hartman goto ignore_char; 225ab4382d2SGreg Kroah-Hartman uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 226ab4382d2SGreg Kroah-Hartman ignore_char: 227ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 228ab4382d2SGreg Kroah-Hartman } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 229ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 230ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(tty); 231ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 232ab4382d2SGreg Kroah-Hartman } 233ab4382d2SGreg Kroah-Hartman 234ab4382d2SGreg Kroah-Hartman static void transmit_chars(struct uart_omap_port *up) 235ab4382d2SGreg Kroah-Hartman { 236ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 237ab4382d2SGreg Kroah-Hartman int count; 238ab4382d2SGreg Kroah-Hartman 239ab4382d2SGreg Kroah-Hartman if (up->port.x_char) { 240ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, up->port.x_char); 241ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 242ab4382d2SGreg Kroah-Hartman up->port.x_char = 0; 243ab4382d2SGreg Kroah-Hartman return; 244ab4382d2SGreg Kroah-Hartman } 245ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 246ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 247ab4382d2SGreg Kroah-Hartman return; 248ab4382d2SGreg Kroah-Hartman } 249ab4382d2SGreg Kroah-Hartman count = up->port.fifosize / 4; 250ab4382d2SGreg Kroah-Hartman do { 251ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, xmit->buf[xmit->tail]); 252ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 253ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 254ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 255ab4382d2SGreg Kroah-Hartman break; 256ab4382d2SGreg Kroah-Hartman } while (--count > 0); 257ab4382d2SGreg Kroah-Hartman 258ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 259ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 260ab4382d2SGreg Kroah-Hartman 261ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 262ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 263ab4382d2SGreg Kroah-Hartman } 264ab4382d2SGreg Kroah-Hartman 265ab4382d2SGreg Kroah-Hartman static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 266ab4382d2SGreg Kroah-Hartman { 267ab4382d2SGreg Kroah-Hartman if (!(up->ier & UART_IER_THRI)) { 268ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_THRI; 269ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 270ab4382d2SGreg Kroah-Hartman } 271ab4382d2SGreg Kroah-Hartman } 272ab4382d2SGreg Kroah-Hartman 273ab4382d2SGreg Kroah-Hartman static void serial_omap_start_tx(struct uart_port *port) 274ab4382d2SGreg Kroah-Hartman { 275ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 276ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit; 277ab4382d2SGreg Kroah-Hartman unsigned int start; 278ab4382d2SGreg Kroah-Hartman int ret = 0; 279ab4382d2SGreg Kroah-Hartman 280ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 281fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 282ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 283fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 284fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 285ab4382d2SGreg Kroah-Hartman return; 286ab4382d2SGreg Kroah-Hartman } 287ab4382d2SGreg Kroah-Hartman 288ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_used) 289ab4382d2SGreg Kroah-Hartman return; 290ab4382d2SGreg Kroah-Hartman 291ab4382d2SGreg Kroah-Hartman xmit = &up->port.state->xmit; 292ab4382d2SGreg Kroah-Hartman 293ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) { 294fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 295ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_tx, 296ab4382d2SGreg Kroah-Hartman "UART Tx DMA", 297ab4382d2SGreg Kroah-Hartman (void *)uart_tx_dma_callback, up, 298ab4382d2SGreg Kroah-Hartman &(up->uart_dma.tx_dma_channel)); 299ab4382d2SGreg Kroah-Hartman 300ab4382d2SGreg Kroah-Hartman if (ret < 0) { 301ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 302ab4382d2SGreg Kroah-Hartman return; 303ab4382d2SGreg Kroah-Hartman } 304ab4382d2SGreg Kroah-Hartman } 305ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 306ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = true; 307ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman start = up->uart_dma.tx_buf_dma_phys + 310ab4382d2SGreg Kroah-Hartman (xmit->tail & (UART_XMIT_SIZE - 1)); 311ab4382d2SGreg Kroah-Hartman 312ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 313ab4382d2SGreg Kroah-Hartman /* 314ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 315ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 316ab4382d2SGreg Kroah-Hartman * transfers 317ab4382d2SGreg Kroah-Hartman */ 318ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 319ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 320ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 321ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + 322ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE) - start; 323ab4382d2SGreg Kroah-Hartman 324ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 325ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 326ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 327ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 328ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 329ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 330ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 331ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 332ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 333ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 334ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 335ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 336ab4382d2SGreg Kroah-Hartman } 337ab4382d2SGreg Kroah-Hartman 338ab4382d2SGreg Kroah-Hartman static unsigned int check_modem_status(struct uart_omap_port *up) 339ab4382d2SGreg Kroah-Hartman { 340ab4382d2SGreg Kroah-Hartman unsigned int status; 341ab4382d2SGreg Kroah-Hartman 342ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_MSR); 343ab4382d2SGreg Kroah-Hartman status |= up->msr_saved_flags; 344ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 345ab4382d2SGreg Kroah-Hartman if ((status & UART_MSR_ANY_DELTA) == 0) 346ab4382d2SGreg Kroah-Hartman return status; 347ab4382d2SGreg Kroah-Hartman 348ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 349ab4382d2SGreg Kroah-Hartman up->port.state != NULL) { 350ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_TERI) 351ab4382d2SGreg Kroah-Hartman up->port.icount.rng++; 352ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDSR) 353ab4382d2SGreg Kroah-Hartman up->port.icount.dsr++; 354ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDCD) 355ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change 356ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_DCD); 357ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCTS) 358ab4382d2SGreg Kroah-Hartman uart_handle_cts_change 359ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_CTS); 360ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&up->port.state->port.delta_msr_wait); 361ab4382d2SGreg Kroah-Hartman } 362ab4382d2SGreg Kroah-Hartman 363ab4382d2SGreg Kroah-Hartman return status; 364ab4382d2SGreg Kroah-Hartman } 365ab4382d2SGreg Kroah-Hartman 366ab4382d2SGreg Kroah-Hartman /** 367ab4382d2SGreg Kroah-Hartman * serial_omap_irq() - This handles the interrupt from one port 368ab4382d2SGreg Kroah-Hartman * @irq: uart port irq number 369ab4382d2SGreg Kroah-Hartman * @dev_id: uart port info 370ab4382d2SGreg Kroah-Hartman */ 371ab4382d2SGreg Kroah-Hartman static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) 372ab4382d2SGreg Kroah-Hartman { 373ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = dev_id; 374ab4382d2SGreg Kroah-Hartman unsigned int iir, lsr; 375ab4382d2SGreg Kroah-Hartman unsigned long flags; 376ab4382d2SGreg Kroah-Hartman 377fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 378ab4382d2SGreg Kroah-Hartman iir = serial_in(up, UART_IIR); 379fcdca757SGovindraj.R if (iir & UART_IIR_NO_INT) { 380fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 381fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 382ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 383fcdca757SGovindraj.R } 384ab4382d2SGreg Kroah-Hartman 385ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 386ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 387ab4382d2SGreg Kroah-Hartman if (iir & UART_IIR_RLSI) { 388ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 389ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_DR) 390ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 391ab4382d2SGreg Kroah-Hartman } else { 392ab4382d2SGreg Kroah-Hartman up->ier &= ~(UART_IER_RDI | UART_IER_RLSI); 393ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 394ab4382d2SGreg Kroah-Hartman if ((serial_omap_start_rxdma(up) != 0) && 395ab4382d2SGreg Kroah-Hartman (lsr & UART_LSR_DR)) 396ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 397ab4382d2SGreg Kroah-Hartman } 398ab4382d2SGreg Kroah-Hartman } 399ab4382d2SGreg Kroah-Hartman 400ab4382d2SGreg Kroah-Hartman check_modem_status(up); 401ab4382d2SGreg Kroah-Hartman if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) 402ab4382d2SGreg Kroah-Hartman transmit_chars(up); 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 405fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 406fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 407fcdca757SGovindraj.R 408ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 409ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 410ab4382d2SGreg Kroah-Hartman } 411ab4382d2SGreg Kroah-Hartman 412ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_tx_empty(struct uart_port *port) 413ab4382d2SGreg Kroah-Hartman { 414ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 415ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 416ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 417ab4382d2SGreg Kroah-Hartman 418fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 419ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id); 420ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 421ab4382d2SGreg Kroah-Hartman ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 422ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 423fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 424ab4382d2SGreg Kroah-Hartman return ret; 425ab4382d2SGreg Kroah-Hartman } 426ab4382d2SGreg Kroah-Hartman 427ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_get_mctrl(struct uart_port *port) 428ab4382d2SGreg Kroah-Hartman { 429ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 430ab4382d2SGreg Kroah-Hartman unsigned char status; 431ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 432ab4382d2SGreg Kroah-Hartman 433fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 434ab4382d2SGreg Kroah-Hartman status = check_modem_status(up); 435fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 436fcdca757SGovindraj.R 437ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id); 438ab4382d2SGreg Kroah-Hartman 439ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCD) 440ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CAR; 441ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_RI) 442ab4382d2SGreg Kroah-Hartman ret |= TIOCM_RNG; 443ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DSR) 444ab4382d2SGreg Kroah-Hartman ret |= TIOCM_DSR; 445ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_CTS) 446ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CTS; 447ab4382d2SGreg Kroah-Hartman return ret; 448ab4382d2SGreg Kroah-Hartman } 449ab4382d2SGreg Kroah-Hartman 450ab4382d2SGreg Kroah-Hartman static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 451ab4382d2SGreg Kroah-Hartman { 452ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 453ab4382d2SGreg Kroah-Hartman unsigned char mcr = 0; 454ab4382d2SGreg Kroah-Hartman 455ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id); 456ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 457ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_RTS; 458ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_DTR) 459ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_DTR; 460ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT1) 461ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT1; 462ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT2) 463ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT2; 464ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_LOOP) 465ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_LOOP; 466ab4382d2SGreg Kroah-Hartman 467fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 468c538d20cSGovindraj.R up->mcr = serial_in(up, UART_MCR); 469c538d20cSGovindraj.R up->mcr |= mcr; 470c538d20cSGovindraj.R serial_out(up, UART_MCR, up->mcr); 471fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 472ab4382d2SGreg Kroah-Hartman } 473ab4382d2SGreg Kroah-Hartman 474ab4382d2SGreg Kroah-Hartman static void serial_omap_break_ctl(struct uart_port *port, int break_state) 475ab4382d2SGreg Kroah-Hartman { 476ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 477ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 478ab4382d2SGreg Kroah-Hartman 479ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id); 480fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 481ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 482ab4382d2SGreg Kroah-Hartman if (break_state == -1) 483ab4382d2SGreg Kroah-Hartman up->lcr |= UART_LCR_SBC; 484ab4382d2SGreg Kroah-Hartman else 485ab4382d2SGreg Kroah-Hartman up->lcr &= ~UART_LCR_SBC; 486ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 487ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 488fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 489ab4382d2SGreg Kroah-Hartman } 490ab4382d2SGreg Kroah-Hartman 491ab4382d2SGreg Kroah-Hartman static int serial_omap_startup(struct uart_port *port) 492ab4382d2SGreg Kroah-Hartman { 493ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 494ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 495ab4382d2SGreg Kroah-Hartman int retval; 496ab4382d2SGreg Kroah-Hartman 497ab4382d2SGreg Kroah-Hartman /* 498ab4382d2SGreg Kroah-Hartman * Allocate the IRQ 499ab4382d2SGreg Kroah-Hartman */ 500ab4382d2SGreg Kroah-Hartman retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 501ab4382d2SGreg Kroah-Hartman up->name, up); 502ab4382d2SGreg Kroah-Hartman if (retval) 503ab4382d2SGreg Kroah-Hartman return retval; 504ab4382d2SGreg Kroah-Hartman 505ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id); 506ab4382d2SGreg Kroah-Hartman 507fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 508ab4382d2SGreg Kroah-Hartman /* 509ab4382d2SGreg Kroah-Hartman * Clear the FIFO buffers and disable them. 510ab4382d2SGreg Kroah-Hartman * (they will be reenabled in set_termios()) 511ab4382d2SGreg Kroah-Hartman */ 512ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 513ab4382d2SGreg Kroah-Hartman /* For Hardware flow control */ 514ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, UART_MCR_RTS); 515ab4382d2SGreg Kroah-Hartman 516ab4382d2SGreg Kroah-Hartman /* 517ab4382d2SGreg Kroah-Hartman * Clear the interrupt registers. 518ab4382d2SGreg Kroah-Hartman */ 519ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_LSR); 520ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 521ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 522ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_IIR); 523ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_MSR); 524ab4382d2SGreg Kroah-Hartman 525ab4382d2SGreg Kroah-Hartman /* 526ab4382d2SGreg Kroah-Hartman * Now, initialize the UART 527ab4382d2SGreg Kroah-Hartman */ 528ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_WLEN8); 529ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 530ab4382d2SGreg Kroah-Hartman /* 531ab4382d2SGreg Kroah-Hartman * Most PC uarts need OUT2 raised to enable interrupts. 532ab4382d2SGreg Kroah-Hartman */ 533ab4382d2SGreg Kroah-Hartman up->port.mctrl |= TIOCM_OUT2; 534ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 535ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 536ab4382d2SGreg Kroah-Hartman 537ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 538ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 539ab4382d2SGreg Kroah-Hartman free_page((unsigned long)up->port.state->xmit.buf); 540ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = dma_alloc_coherent(NULL, 541ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, 542ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 543ab4382d2SGreg Kroah-Hartman 0); 544ab4382d2SGreg Kroah-Hartman init_timer(&(up->uart_dma.rx_timer)); 545a9e210e0SJon Hunter up->uart_dma.rx_timer.function = serial_omap_rxdma_poll; 546ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timer.data = up->pdev->id; 547ab4382d2SGreg Kroah-Hartman /* Currently the buffer size is 4KB. Can increase it */ 548ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = dma_alloc_coherent(NULL, 549ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 550ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0); 551ab4382d2SGreg Kroah-Hartman } 552ab4382d2SGreg Kroah-Hartman /* 553ab4382d2SGreg Kroah-Hartman * Finally, enable interrupts. Note: Modem status interrupts 554ab4382d2SGreg Kroah-Hartman * are set via set_termios(), which will be occurring imminently 555ab4382d2SGreg Kroah-Hartman * anyway, so we don't enable them here. 556ab4382d2SGreg Kroah-Hartman */ 557ab4382d2SGreg Kroah-Hartman up->ier = UART_IER_RLSI | UART_IER_RDI; 558ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 559ab4382d2SGreg Kroah-Hartman 56078841462SJarkko Nikula /* Enable module level wake up */ 56178841462SJarkko Nikula serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); 56278841462SJarkko Nikula 563fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 564fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 565ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 566ab4382d2SGreg Kroah-Hartman return 0; 567ab4382d2SGreg Kroah-Hartman } 568ab4382d2SGreg Kroah-Hartman 569ab4382d2SGreg Kroah-Hartman static void serial_omap_shutdown(struct uart_port *port) 570ab4382d2SGreg Kroah-Hartman { 571ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 572ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 573ab4382d2SGreg Kroah-Hartman 574ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id); 575fcdca757SGovindraj.R 576fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 577ab4382d2SGreg Kroah-Hartman /* 578ab4382d2SGreg Kroah-Hartman * Disable interrupts from this port 579ab4382d2SGreg Kroah-Hartman */ 580ab4382d2SGreg Kroah-Hartman up->ier = 0; 581ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 582ab4382d2SGreg Kroah-Hartman 583ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 584ab4382d2SGreg Kroah-Hartman up->port.mctrl &= ~TIOCM_OUT2; 585ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 586ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 587ab4382d2SGreg Kroah-Hartman 588ab4382d2SGreg Kroah-Hartman /* 589ab4382d2SGreg Kroah-Hartman * Disable break condition and FIFOs 590ab4382d2SGreg Kroah-Hartman */ 591ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 592ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 593ab4382d2SGreg Kroah-Hartman 594ab4382d2SGreg Kroah-Hartman /* 595ab4382d2SGreg Kroah-Hartman * Read data port to reset things, and then free the irq 596ab4382d2SGreg Kroah-Hartman */ 597ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 598ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 599ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 600ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 601ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, up->port.state->xmit.buf, 602ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys); 603ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = NULL; 604ab4382d2SGreg Kroah-Hartman serial_omap_stop_rx(port); 605ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 606ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, up->uart_dma.rx_buf, 607ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys); 608ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = NULL; 609ab4382d2SGreg Kroah-Hartman } 610fcdca757SGovindraj.R 611fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 612ab4382d2SGreg Kroah-Hartman free_irq(up->port.irq, up); 613ab4382d2SGreg Kroah-Hartman } 614ab4382d2SGreg Kroah-Hartman 615ab4382d2SGreg Kroah-Hartman static inline void 616ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff 617ab4382d2SGreg Kroah-Hartman (struct uart_omap_port *up, struct ktermios *termios) 618ab4382d2SGreg Kroah-Hartman { 619ab4382d2SGreg Kroah-Hartman up->lcr = serial_in(up, UART_LCR); 620ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 621ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 622ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); 623ab4382d2SGreg Kroah-Hartman 624ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XON1, termios->c_cc[VSTART]); 625ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 626ab4382d2SGreg Kroah-Hartman 627ab4382d2SGreg Kroah-Hartman /* clear SW control mode bits */ 628c538d20cSGovindraj.R up->efr &= OMAP_UART_SW_CLR; 629ab4382d2SGreg Kroah-Hartman 630ab4382d2SGreg Kroah-Hartman /* 631ab4382d2SGreg Kroah-Hartman * IXON Flag: 632ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 633ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 634ab4382d2SGreg Kroah-Hartman */ 635ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 636c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_TX; 637ab4382d2SGreg Kroah-Hartman 638ab4382d2SGreg Kroah-Hartman /* 639ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 640ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 641ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 642ab4382d2SGreg Kroah-Hartman */ 643ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 644c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_RX; 645ab4382d2SGreg Kroah-Hartman 646ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 647ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 648ab4382d2SGreg Kroah-Hartman 649ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 650ab4382d2SGreg Kroah-Hartman 651ab4382d2SGreg Kroah-Hartman /* 652ab4382d2SGreg Kroah-Hartman * IXANY Flag: 653ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 654ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 655ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 656ab4382d2SGreg Kroah-Hartman */ 657ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 658ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 659ab4382d2SGreg Kroah-Hartman 660ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 661ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 662ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 663ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 664ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 665ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 666ab4382d2SGreg Kroah-Hartman */ 667c538d20cSGovindraj.R serial_out(up, UART_EFR, up->efr | UART_EFR_SCD); 668ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 669ab4382d2SGreg Kroah-Hartman 670ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 671ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 672ab4382d2SGreg Kroah-Hartman } 673ab4382d2SGreg Kroah-Hartman 674ab4382d2SGreg Kroah-Hartman static void 675ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 676ab4382d2SGreg Kroah-Hartman struct ktermios *old) 677ab4382d2SGreg Kroah-Hartman { 678ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 679ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 680ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 681ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 682ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 683ab4382d2SGreg Kroah-Hartman 684ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 685ab4382d2SGreg Kroah-Hartman case CS5: 686ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 687ab4382d2SGreg Kroah-Hartman break; 688ab4382d2SGreg Kroah-Hartman case CS6: 689ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 690ab4382d2SGreg Kroah-Hartman break; 691ab4382d2SGreg Kroah-Hartman case CS7: 692ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 693ab4382d2SGreg Kroah-Hartman break; 694ab4382d2SGreg Kroah-Hartman default: 695ab4382d2SGreg Kroah-Hartman case CS8: 696ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 697ab4382d2SGreg Kroah-Hartman break; 698ab4382d2SGreg Kroah-Hartman } 699ab4382d2SGreg Kroah-Hartman 700ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 701ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 702ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 703ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 704ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 705ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 706ab4382d2SGreg Kroah-Hartman 707ab4382d2SGreg Kroah-Hartman /* 708ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 709ab4382d2SGreg Kroah-Hartman */ 710ab4382d2SGreg Kroah-Hartman 711ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 712ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 713ab4382d2SGreg Kroah-Hartman 714c538d20cSGovindraj.R up->dll = quot & 0xff; 715c538d20cSGovindraj.R up->dlh = quot >> 8; 716c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_DISABLE; 717c538d20cSGovindraj.R 718ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 719ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 720ab4382d2SGreg Kroah-Hartman if (up->use_dma) 721ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 722ab4382d2SGreg Kroah-Hartman 723ab4382d2SGreg Kroah-Hartman /* 724ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 725ab4382d2SGreg Kroah-Hartman * interrupts disabled. 726ab4382d2SGreg Kroah-Hartman */ 727fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 728ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 729ab4382d2SGreg Kroah-Hartman 730ab4382d2SGreg Kroah-Hartman /* 731ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 732ab4382d2SGreg Kroah-Hartman */ 733ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 734ab4382d2SGreg Kroah-Hartman 735ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 736ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 737ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 738ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 739ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 740ab4382d2SGreg Kroah-Hartman 741ab4382d2SGreg Kroah-Hartman /* 742ab4382d2SGreg Kroah-Hartman * Characters to ignore 743ab4382d2SGreg Kroah-Hartman */ 744ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 745ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 746ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 747ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 748ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 749ab4382d2SGreg Kroah-Hartman /* 750ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 751ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 752ab4382d2SGreg Kroah-Hartman */ 753ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 754ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 755ab4382d2SGreg Kroah-Hartman } 756ab4382d2SGreg Kroah-Hartman 757ab4382d2SGreg Kroah-Hartman /* 758ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 759ab4382d2SGreg Kroah-Hartman */ 760ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 761ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 762ab4382d2SGreg Kroah-Hartman 763ab4382d2SGreg Kroah-Hartman /* 764ab4382d2SGreg Kroah-Hartman * Modem status interrupts 765ab4382d2SGreg Kroah-Hartman */ 766ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 767ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 768ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 769ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 770ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 771c538d20cSGovindraj.R up->lcr = cval; 77232212897SGovindraj.R up->scr = OMAP_UART_SCR_TX_EMPTY; 773ab4382d2SGreg Kroah-Hartman 774ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 775ab4382d2SGreg Kroah-Hartman 776ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 777ab4382d2SGreg Kroah-Hartman * baud clock is not running 778ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 779ab4382d2SGreg Kroah-Hartman */ 780ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 781ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 782ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 783ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 784ab4382d2SGreg Kroah-Hartman 785ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 786ab4382d2SGreg Kroah-Hartman 787ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 788ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 789ab4382d2SGreg Kroah-Hartman 790ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 791ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 792ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 793ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 794ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, up->fcr); 795ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 796ab4382d2SGreg Kroah-Hartman 797ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 798ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TLR, 0); 799c538d20cSGovindraj.R up->scr |= (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8); 800ab4382d2SGreg Kroah-Hartman } 801ab4382d2SGreg Kroah-Hartman 802c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 803c538d20cSGovindraj.R 804ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 805ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 806ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 807ab4382d2SGreg Kroah-Hartman 808ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 809ab4382d2SGreg Kroah-Hartman 81094734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 81194734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 81294734749SGovindraj.R else 813c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 81494734749SGovindraj.R 815ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 816ab4382d2SGreg Kroah-Hartman 817ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 818ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 819ab4382d2SGreg Kroah-Hartman 820ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 821ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 822ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 823ab4382d2SGreg Kroah-Hartman 824c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 825c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 826ab4382d2SGreg Kroah-Hartman 827ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 828ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 829ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 832ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 833ab4382d2SGreg Kroah-Hartman 834ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 835c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_13X_MODE; 836ab4382d2SGreg Kroah-Hartman else 837c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_16X_MODE; 838c538d20cSGovindraj.R 83994734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 84094734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 84194734749SGovindraj.R else 842c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 843ab4382d2SGreg Kroah-Hartman 844ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 845ab4382d2SGreg Kroah-Hartman 846ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 847ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 848ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 849ab4382d2SGreg Kroah-Hartman 850ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 851ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 852ab4382d2SGreg Kroah-Hartman 853ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 854ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 855ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 856ab4382d2SGreg Kroah-Hartman 857ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 858ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 859ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 860ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 861ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 862ab4382d2SGreg Kroah-Hartman } 863ab4382d2SGreg Kroah-Hartman 864ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 865ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 866ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 867ab4382d2SGreg Kroah-Hartman 868ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 869fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 870ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id); 871ab4382d2SGreg Kroah-Hartman } 872ab4382d2SGreg Kroah-Hartman 873ab4382d2SGreg Kroah-Hartman static void 874ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 875ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 876ab4382d2SGreg Kroah-Hartman { 877ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 878ab4382d2SGreg Kroah-Hartman unsigned char efr; 879ab4382d2SGreg Kroah-Hartman 880ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id); 881fcdca757SGovindraj.R 882fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 883ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 884ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 885ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 886ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 887ab4382d2SGreg Kroah-Hartman 888ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 889ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 890ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 891ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 892fcdca757SGovindraj.R 893fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 894fcdca757SGovindraj.R if (!state) 895fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 896fcdca757SGovindraj.R else 897fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 898fcdca757SGovindraj.R } 899fcdca757SGovindraj.R 900fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 901ab4382d2SGreg Kroah-Hartman } 902ab4382d2SGreg Kroah-Hartman 903ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 904ab4382d2SGreg Kroah-Hartman { 905ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 906ab4382d2SGreg Kroah-Hartman } 907ab4382d2SGreg Kroah-Hartman 908ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 909ab4382d2SGreg Kroah-Hartman { 910ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 911ab4382d2SGreg Kroah-Hartman return 0; 912ab4382d2SGreg Kroah-Hartman } 913ab4382d2SGreg Kroah-Hartman 914ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 915ab4382d2SGreg Kroah-Hartman { 916ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 917ab4382d2SGreg Kroah-Hartman 918ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 919ab4382d2SGreg Kroah-Hartman up->pdev->id); 920ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 921ab4382d2SGreg Kroah-Hartman } 922ab4382d2SGreg Kroah-Hartman 923ab4382d2SGreg Kroah-Hartman static int 924ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 925ab4382d2SGreg Kroah-Hartman { 926ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 927ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 928ab4382d2SGreg Kroah-Hartman return -EINVAL; 929ab4382d2SGreg Kroah-Hartman } 930ab4382d2SGreg Kroah-Hartman 931ab4382d2SGreg Kroah-Hartman static const char * 932ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 933ab4382d2SGreg Kroah-Hartman { 934ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 935ab4382d2SGreg Kroah-Hartman 936ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id); 937ab4382d2SGreg Kroah-Hartman return up->name; 938ab4382d2SGreg Kroah-Hartman } 939ab4382d2SGreg Kroah-Hartman 940ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 941ab4382d2SGreg Kroah-Hartman 942ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 943ab4382d2SGreg Kroah-Hartman { 944ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 945ab4382d2SGreg Kroah-Hartman 946ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 947ab4382d2SGreg Kroah-Hartman do { 948ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 949ab4382d2SGreg Kroah-Hartman 950ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 951ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 952ab4382d2SGreg Kroah-Hartman 953ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 954ab4382d2SGreg Kroah-Hartman break; 955ab4382d2SGreg Kroah-Hartman udelay(1); 956ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 957ab4382d2SGreg Kroah-Hartman 958ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 959ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 960ab4382d2SGreg Kroah-Hartman tmout = 1000000; 961ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 962ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 963ab4382d2SGreg Kroah-Hartman 964ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 965ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 966ab4382d2SGreg Kroah-Hartman break; 967ab4382d2SGreg Kroah-Hartman 968ab4382d2SGreg Kroah-Hartman udelay(1); 969ab4382d2SGreg Kroah-Hartman } 970ab4382d2SGreg Kroah-Hartman } 971ab4382d2SGreg Kroah-Hartman } 972ab4382d2SGreg Kroah-Hartman 973ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 974ab4382d2SGreg Kroah-Hartman 975ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 976ab4382d2SGreg Kroah-Hartman { 977ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 978fcdca757SGovindraj.R 979fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 980ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 981ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 982fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 983ab4382d2SGreg Kroah-Hartman } 984ab4382d2SGreg Kroah-Hartman 985ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 986ab4382d2SGreg Kroah-Hartman { 987ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 988fcdca757SGovindraj.R unsigned int status; 989ab4382d2SGreg Kroah-Hartman 990fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 991fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 992ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 993ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 994ab4382d2SGreg Kroah-Hartman 995fcdca757SGovindraj.R status = serial_in(up, UART_RX); 996fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 997fcdca757SGovindraj.R return status; 998ab4382d2SGreg Kroah-Hartman } 999ab4382d2SGreg Kroah-Hartman 1000ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 1001ab4382d2SGreg Kroah-Hartman 1002ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1003ab4382d2SGreg Kroah-Hartman 1004ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 1005ab4382d2SGreg Kroah-Hartman 1006ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 1007ab4382d2SGreg Kroah-Hartman 1008ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 1009ab4382d2SGreg Kroah-Hartman { 1010ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1011ab4382d2SGreg Kroah-Hartman 1012ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1013ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1014ab4382d2SGreg Kroah-Hartman } 1015ab4382d2SGreg Kroah-Hartman 1016ab4382d2SGreg Kroah-Hartman static void 1017ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1018ab4382d2SGreg Kroah-Hartman unsigned int count) 1019ab4382d2SGreg Kroah-Hartman { 1020ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1021ab4382d2SGreg Kroah-Hartman unsigned long flags; 1022ab4382d2SGreg Kroah-Hartman unsigned int ier; 1023ab4382d2SGreg Kroah-Hartman int locked = 1; 1024ab4382d2SGreg Kroah-Hartman 1025fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1026fcdca757SGovindraj.R 1027ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1028ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1029ab4382d2SGreg Kroah-Hartman locked = 0; 1030ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1031ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1032ab4382d2SGreg Kroah-Hartman else 1033ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1034ab4382d2SGreg Kroah-Hartman 1035ab4382d2SGreg Kroah-Hartman /* 1036ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1037ab4382d2SGreg Kroah-Hartman */ 1038ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1039ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1040ab4382d2SGreg Kroah-Hartman 1041ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman /* 1044ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1045ab4382d2SGreg Kroah-Hartman * and restore the IER 1046ab4382d2SGreg Kroah-Hartman */ 1047ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1048ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1049ab4382d2SGreg Kroah-Hartman /* 1050ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1051ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1052ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1053ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1054ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1055ab4382d2SGreg Kroah-Hartman */ 1056ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1057ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1058ab4382d2SGreg Kroah-Hartman 1059fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1060fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1061ab4382d2SGreg Kroah-Hartman if (locked) 1062ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1063ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1064ab4382d2SGreg Kroah-Hartman } 1065ab4382d2SGreg Kroah-Hartman 1066ab4382d2SGreg Kroah-Hartman static int __init 1067ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1068ab4382d2SGreg Kroah-Hartman { 1069ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1070ab4382d2SGreg Kroah-Hartman int baud = 115200; 1071ab4382d2SGreg Kroah-Hartman int bits = 8; 1072ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1073ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1074ab4382d2SGreg Kroah-Hartman 1075ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1076ab4382d2SGreg Kroah-Hartman return -ENODEV; 1077ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1078ab4382d2SGreg Kroah-Hartman 1079ab4382d2SGreg Kroah-Hartman if (options) 1080ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1083ab4382d2SGreg Kroah-Hartman } 1084ab4382d2SGreg Kroah-Hartman 1085ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1086ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1087ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1088ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1089ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1090ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1091ab4382d2SGreg Kroah-Hartman .index = -1, 1092ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1093ab4382d2SGreg Kroah-Hartman }; 1094ab4382d2SGreg Kroah-Hartman 1095ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1096ab4382d2SGreg Kroah-Hartman { 1097ab4382d2SGreg Kroah-Hartman serial_omap_console_ports[up->pdev->id] = up; 1098ab4382d2SGreg Kroah-Hartman } 1099ab4382d2SGreg Kroah-Hartman 1100ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1101ab4382d2SGreg Kroah-Hartman 1102ab4382d2SGreg Kroah-Hartman #else 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1107ab4382d2SGreg Kroah-Hartman {} 1108ab4382d2SGreg Kroah-Hartman 1109ab4382d2SGreg Kroah-Hartman #endif 1110ab4382d2SGreg Kroah-Hartman 1111ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1112ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1113ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1114ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1115ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1116ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1117ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1118ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1119ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1120ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1121ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1122ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1123ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1124ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1125ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1126ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1127ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1128ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1129ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1130ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1131ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1132ab4382d2SGreg Kroah-Hartman #endif 1133ab4382d2SGreg Kroah-Hartman }; 1134ab4382d2SGreg Kroah-Hartman 1135ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1136ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1137ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1138ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1139ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1140ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1141ab4382d2SGreg Kroah-Hartman }; 1142ab4382d2SGreg Kroah-Hartman 1143fcdca757SGovindraj.R #ifdef CONFIG_SUSPEND 1144fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1145ab4382d2SGreg Kroah-Hartman { 1146fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1147ab4382d2SGreg Kroah-Hartman 1148ab4382d2SGreg Kroah-Hartman if (up) 1149ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 1150ab4382d2SGreg Kroah-Hartman return 0; 1151ab4382d2SGreg Kroah-Hartman } 1152ab4382d2SGreg Kroah-Hartman 1153fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1154ab4382d2SGreg Kroah-Hartman { 1155fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman if (up) 1158ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1159ab4382d2SGreg Kroah-Hartman return 0; 1160ab4382d2SGreg Kroah-Hartman } 1161fcdca757SGovindraj.R #endif 1162ab4382d2SGreg Kroah-Hartman 1163a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no) 1164ab4382d2SGreg Kroah-Hartman { 1165ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1166ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1167ab4382d2SGreg Kroah-Hartman int ret = 0; 1168ab4382d2SGreg Kroah-Hartman 1169ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1170ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1171ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1172ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1173a9e210e0SJon Hunter up->uart_dma.rx_timeout) { 1174ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1175a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1176ab4382d2SGreg Kroah-Hartman } else { 1177ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1178ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1179ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1180ab4382d2SGreg Kroah-Hartman } 1181ab4382d2SGreg Kroah-Hartman return; 1182ab4382d2SGreg Kroah-Hartman } 1183ab4382d2SGreg Kroah-Hartman 1184ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1185ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1186ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1187ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1188ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1189ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1190ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1191ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1192ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1193ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1194ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1195ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1196ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1197ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1198ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1199ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1200ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1201ab4382d2SGreg Kroah-Hartman } 1202ab4382d2SGreg Kroah-Hartman } else { 1203ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1204a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1205ab4382d2SGreg Kroah-Hartman } 1206ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1207ab4382d2SGreg Kroah-Hartman } 1208ab4382d2SGreg Kroah-Hartman 1209ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1210ab4382d2SGreg Kroah-Hartman { 1211ab4382d2SGreg Kroah-Hartman return; 1212ab4382d2SGreg Kroah-Hartman } 1213ab4382d2SGreg Kroah-Hartman 1214ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1215ab4382d2SGreg Kroah-Hartman { 1216ab4382d2SGreg Kroah-Hartman int ret = 0; 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1219fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1220ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1221ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1222ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1223ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1224ab4382d2SGreg Kroah-Hartman if (ret < 0) 1225ab4382d2SGreg Kroah-Hartman return ret; 1226ab4382d2SGreg Kroah-Hartman 1227ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1228ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1229ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1230ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1231ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1232ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1233ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1234ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1235ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1236ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1237ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1238ab4382d2SGreg Kroah-Hartman } 1239ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1240ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1241ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1242ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1243a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1244ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1245ab4382d2SGreg Kroah-Hartman return ret; 1246ab4382d2SGreg Kroah-Hartman } 1247ab4382d2SGreg Kroah-Hartman 1248ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1249ab4382d2SGreg Kroah-Hartman { 1250ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1251ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1252ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1253ab4382d2SGreg Kroah-Hartman 1254ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1255ab4382d2SGreg Kroah-Hartman return; 1256ab4382d2SGreg Kroah-Hartman 1257ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1258ab4382d2SGreg Kroah-Hartman /* 1259ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1260ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1261ab4382d2SGreg Kroah-Hartman * transfers 1262ab4382d2SGreg Kroah-Hartman */ 1263ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1264ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1265ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1266ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1267ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1268ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1269ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1270ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1271ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1272ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1273ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1274ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1275ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1276ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1277ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1278ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1279ab4382d2SGreg Kroah-Hartman } 1280ab4382d2SGreg Kroah-Hartman 1281ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1282ab4382d2SGreg Kroah-Hartman { 1283ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1284ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1285ab4382d2SGreg Kroah-Hartman 1286ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1287ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1288ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1289ab4382d2SGreg Kroah-Hartman 1290ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1291ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1292ab4382d2SGreg Kroah-Hartman 1293ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1294ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1295ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1296ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1297ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1298ab4382d2SGreg Kroah-Hartman } else { 1299ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1300ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1301ab4382d2SGreg Kroah-Hartman } 1302ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1303ab4382d2SGreg Kroah-Hartman return; 1304ab4382d2SGreg Kroah-Hartman } 1305ab4382d2SGreg Kroah-Hartman 1306ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1307ab4382d2SGreg Kroah-Hartman { 1308ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1309ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1310ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1311ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1312ab4382d2SGreg Kroah-Hartman 1313ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1314ab4382d2SGreg Kroah-Hartman if (!mem) { 1315ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1316ab4382d2SGreg Kroah-Hartman return -ENODEV; 1317ab4382d2SGreg Kroah-Hartman } 1318ab4382d2SGreg Kroah-Hartman 1319ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1320ab4382d2SGreg Kroah-Hartman if (!irq) { 1321ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1322ab4382d2SGreg Kroah-Hartman return -ENODEV; 1323ab4382d2SGreg Kroah-Hartman } 1324ab4382d2SGreg Kroah-Hartman 132528f65c11SJoe Perches if (!request_mem_region(mem->start, resource_size(mem), 1326ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1327ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1328ab4382d2SGreg Kroah-Hartman return -EBUSY; 1329ab4382d2SGreg Kroah-Hartman } 1330ab4382d2SGreg Kroah-Hartman 1331ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1332ab4382d2SGreg Kroah-Hartman if (!dma_rx) { 1333ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1334ab4382d2SGreg Kroah-Hartman goto err; 1335ab4382d2SGreg Kroah-Hartman } 1336ab4382d2SGreg Kroah-Hartman 1337ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1338ab4382d2SGreg Kroah-Hartman if (!dma_tx) { 1339ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1340ab4382d2SGreg Kroah-Hartman goto err; 1341ab4382d2SGreg Kroah-Hartman } 1342ab4382d2SGreg Kroah-Hartman 1343ab4382d2SGreg Kroah-Hartman up = kzalloc(sizeof(*up), GFP_KERNEL); 1344ab4382d2SGreg Kroah-Hartman if (up == NULL) { 1345ab4382d2SGreg Kroah-Hartman ret = -ENOMEM; 1346ab4382d2SGreg Kroah-Hartman goto do_release_region; 1347ab4382d2SGreg Kroah-Hartman } 1348ab4382d2SGreg Kroah-Hartman sprintf(up->name, "OMAP UART%d", pdev->id); 1349ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1350ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1351ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1352ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1353ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1354ab4382d2SGreg Kroah-Hartman 1355ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1356ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1357ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1358ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1359ab4382d2SGreg Kroah-Hartman 1360edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1361edd70ad7SGovindraj.R up->port.membase = ioremap(mem->start, resource_size(mem)); 1362edd70ad7SGovindraj.R if (!up->port.membase) { 1363edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1364edd70ad7SGovindraj.R ret = -ENOMEM; 1365edd70ad7SGovindraj.R goto err; 1366edd70ad7SGovindraj.R } 1367edd70ad7SGovindraj.R 1368ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1369ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 1370ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 137194734749SGovindraj.R up->errata = omap_up_info->errata; 1372ab4382d2SGreg Kroah-Hartman 1373ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1374ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1375ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1376ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1377c86845dbSDeepak K up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size; 1378c86845dbSDeepak K up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout; 1379a9e210e0SJon Hunter up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate; 1380ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1381ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1382ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1383ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1384ab4382d2SGreg Kroah-Hartman } 1385ab4382d2SGreg Kroah-Hartman 1386fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1387fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1388c86845dbSDeepak K omap_up_info->autosuspend_timeout); 1389fcdca757SGovindraj.R 1390fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1391fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1392fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1393fcdca757SGovindraj.R 1394ab4382d2SGreg Kroah-Hartman ui[pdev->id] = up; 1395ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1396ab4382d2SGreg Kroah-Hartman 1397ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1398ab4382d2SGreg Kroah-Hartman if (ret != 0) 1399ab4382d2SGreg Kroah-Hartman goto do_release_region; 1400ab4382d2SGreg Kroah-Hartman 1401fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1402ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1403ab4382d2SGreg Kroah-Hartman return 0; 1404ab4382d2SGreg Kroah-Hartman err: 1405ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1406ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1407ab4382d2SGreg Kroah-Hartman do_release_region: 140828f65c11SJoe Perches release_mem_region(mem->start, resource_size(mem)); 1409ab4382d2SGreg Kroah-Hartman return ret; 1410ab4382d2SGreg Kroah-Hartman } 1411ab4382d2SGreg Kroah-Hartman 1412ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1413ab4382d2SGreg Kroah-Hartman { 1414ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1415ab4382d2SGreg Kroah-Hartman 1416ab4382d2SGreg Kroah-Hartman if (up) { 1417fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1418ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 1419ab4382d2SGreg Kroah-Hartman kfree(up); 1420ab4382d2SGreg Kroah-Hartman } 1421fcdca757SGovindraj.R 1422fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1423ab4382d2SGreg Kroah-Hartman return 0; 1424ab4382d2SGreg Kroah-Hartman } 1425ab4382d2SGreg Kroah-Hartman 142694734749SGovindraj.R /* 142794734749SGovindraj.R * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 142894734749SGovindraj.R * The access to uart register after MDR1 Access 142994734749SGovindraj.R * causes UART to corrupt data. 143094734749SGovindraj.R * 143194734749SGovindraj.R * Need a delay = 143294734749SGovindraj.R * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 143394734749SGovindraj.R * give 10 times as much 143494734749SGovindraj.R */ 143594734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 143694734749SGovindraj.R { 143794734749SGovindraj.R u8 timeout = 255; 143894734749SGovindraj.R 143994734749SGovindraj.R serial_out(up, UART_OMAP_MDR1, mdr1); 144094734749SGovindraj.R udelay(2); 144194734749SGovindraj.R serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 144294734749SGovindraj.R UART_FCR_CLEAR_RCVR); 144394734749SGovindraj.R /* 144494734749SGovindraj.R * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 144594734749SGovindraj.R * TX_FIFO_E bit is 1. 144694734749SGovindraj.R */ 144794734749SGovindraj.R while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 144894734749SGovindraj.R (UART_LSR_THRE | UART_LSR_DR))) { 144994734749SGovindraj.R timeout--; 145094734749SGovindraj.R if (!timeout) { 145194734749SGovindraj.R /* Should *never* happen. we warn and carry on */ 145294734749SGovindraj.R dev_crit(&up->pdev->dev, "Errata i202: timedout %x\n", 145394734749SGovindraj.R serial_in(up, UART_LSR)); 145494734749SGovindraj.R break; 145594734749SGovindraj.R } 145694734749SGovindraj.R udelay(1); 145794734749SGovindraj.R } 145894734749SGovindraj.R } 145994734749SGovindraj.R 14609f9ac1e8SGovindraj.R static void serial_omap_restore_context(struct uart_omap_port *up) 14619f9ac1e8SGovindraj.R { 146294734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 146394734749SGovindraj.R serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 146494734749SGovindraj.R else 14659f9ac1e8SGovindraj.R serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 146694734749SGovindraj.R 14679f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 14689f9ac1e8SGovindraj.R serial_out(up, UART_EFR, UART_EFR_ECB); 14699f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 14709f9ac1e8SGovindraj.R serial_out(up, UART_IER, 0x0); 14719f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1472c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); 1473c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); 14749f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 14759f9ac1e8SGovindraj.R serial_out(up, UART_IER, up->ier); 14769f9ac1e8SGovindraj.R serial_out(up, UART_FCR, up->fcr); 14779f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 14789f9ac1e8SGovindraj.R serial_out(up, UART_MCR, up->mcr); 14799f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1480c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 14819f9ac1e8SGovindraj.R serial_out(up, UART_EFR, up->efr); 14829f9ac1e8SGovindraj.R serial_out(up, UART_LCR, up->lcr); 148394734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 148494734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 148594734749SGovindraj.R else 1486c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 14879f9ac1e8SGovindraj.R } 14889f9ac1e8SGovindraj.R 1489fcdca757SGovindraj.R #ifdef CONFIG_PM_RUNTIME 1490fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1491fcdca757SGovindraj.R { 1492ec3bebc6SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1493ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 1494ec3bebc6SGovindraj.R 1495ec3bebc6SGovindraj.R if (!up) 1496ec3bebc6SGovindraj.R return -EINVAL; 1497ec3bebc6SGovindraj.R 149862f3ec5fSGovindraj.R if (!pdata->enable_wakeup) 149962f3ec5fSGovindraj.R return 0; 150062f3ec5fSGovindraj.R 1501ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) 1502ec3bebc6SGovindraj.R up->context_loss_cnt = pdata->get_context_loss_count(dev); 1503ec3bebc6SGovindraj.R 150462f3ec5fSGovindraj.R if (device_may_wakeup(dev)) { 150562f3ec5fSGovindraj.R if (!up->wakeups_enabled) { 150662f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, true); 150762f3ec5fSGovindraj.R up->wakeups_enabled = true; 150862f3ec5fSGovindraj.R } 150962f3ec5fSGovindraj.R } else { 151062f3ec5fSGovindraj.R if (up->wakeups_enabled) { 151162f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, false); 151262f3ec5fSGovindraj.R up->wakeups_enabled = false; 151362f3ec5fSGovindraj.R } 151462f3ec5fSGovindraj.R } 151562f3ec5fSGovindraj.R 151694734749SGovindraj.R /* Errata i291 */ 151794734749SGovindraj.R if (up->use_dma && pdata->set_forceidle && 151894734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 151994734749SGovindraj.R pdata->set_forceidle(up->pdev); 152094734749SGovindraj.R 1521fcdca757SGovindraj.R return 0; 1522fcdca757SGovindraj.R } 1523fcdca757SGovindraj.R 1524fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1525fcdca757SGovindraj.R { 15269f9ac1e8SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1527ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 15289f9ac1e8SGovindraj.R 1529ec3bebc6SGovindraj.R if (up) { 1530ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) { 1531ec3bebc6SGovindraj.R u32 loss_cnt = pdata->get_context_loss_count(dev); 1532ec3bebc6SGovindraj.R 1533ec3bebc6SGovindraj.R if (up->context_loss_cnt != loss_cnt) 15349f9ac1e8SGovindraj.R serial_omap_restore_context(up); 1535ec3bebc6SGovindraj.R } 153694734749SGovindraj.R 153794734749SGovindraj.R /* Errata i291 */ 153894734749SGovindraj.R if (up->use_dma && pdata->set_noidle && 153994734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 154094734749SGovindraj.R pdata->set_noidle(up->pdev); 1541ec3bebc6SGovindraj.R } 15429f9ac1e8SGovindraj.R 1543fcdca757SGovindraj.R return 0; 1544fcdca757SGovindraj.R } 1545fcdca757SGovindraj.R #endif 1546fcdca757SGovindraj.R 1547fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1548fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1549fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1550fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1551fcdca757SGovindraj.R }; 1552fcdca757SGovindraj.R 1553ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1554ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1555ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1556ab4382d2SGreg Kroah-Hartman .driver = { 1557ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1558fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1559ab4382d2SGreg Kroah-Hartman }, 1560ab4382d2SGreg Kroah-Hartman }; 1561ab4382d2SGreg Kroah-Hartman 1562ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1563ab4382d2SGreg Kroah-Hartman { 1564ab4382d2SGreg Kroah-Hartman int ret; 1565ab4382d2SGreg Kroah-Hartman 1566ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1567ab4382d2SGreg Kroah-Hartman if (ret != 0) 1568ab4382d2SGreg Kroah-Hartman return ret; 1569ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1570ab4382d2SGreg Kroah-Hartman if (ret != 0) 1571ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1572ab4382d2SGreg Kroah-Hartman return ret; 1573ab4382d2SGreg Kroah-Hartman } 1574ab4382d2SGreg Kroah-Hartman 1575ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1576ab4382d2SGreg Kroah-Hartman { 1577ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1578ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1579ab4382d2SGreg Kroah-Hartman } 1580ab4382d2SGreg Kroah-Hartman 1581ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1582ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1583ab4382d2SGreg Kroah-Hartman 1584ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1585ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1586ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1587