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); 54ab4382d2SGreg Kroah-Hartman 55ab4382d2SGreg Kroah-Hartman static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 56ab4382d2SGreg Kroah-Hartman { 57ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 58ab4382d2SGreg Kroah-Hartman return readw(up->port.membase + offset); 59ab4382d2SGreg Kroah-Hartman } 60ab4382d2SGreg Kroah-Hartman 61ab4382d2SGreg Kroah-Hartman static inline void serial_out(struct uart_omap_port *up, int offset, int value) 62ab4382d2SGreg Kroah-Hartman { 63ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 64ab4382d2SGreg Kroah-Hartman writew(value, up->port.membase + offset); 65ab4382d2SGreg Kroah-Hartman } 66ab4382d2SGreg Kroah-Hartman 67ab4382d2SGreg Kroah-Hartman static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 68ab4382d2SGreg Kroah-Hartman { 69ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 70ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 71ab4382d2SGreg Kroah-Hartman UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 72ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, 0); 73ab4382d2SGreg Kroah-Hartman } 74ab4382d2SGreg Kroah-Hartman 75ab4382d2SGreg Kroah-Hartman /* 76ab4382d2SGreg Kroah-Hartman * serial_omap_get_divisor - calculate divisor value 77ab4382d2SGreg Kroah-Hartman * @port: uart port info 78ab4382d2SGreg Kroah-Hartman * @baud: baudrate for which divisor needs to be calculated. 79ab4382d2SGreg Kroah-Hartman * 80ab4382d2SGreg Kroah-Hartman * We have written our own function to get the divisor so as to support 81ab4382d2SGreg Kroah-Hartman * 13x mode. 3Mbps Baudrate as an different divisor. 82ab4382d2SGreg Kroah-Hartman * Reference OMAP TRM Chapter 17: 83ab4382d2SGreg Kroah-Hartman * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates 84ab4382d2SGreg Kroah-Hartman * referring to oversampling - divisor value 85ab4382d2SGreg Kroah-Hartman * baudrate 460,800 to 3,686,400 all have divisor 13 86ab4382d2SGreg Kroah-Hartman * except 3,000,000 which has divisor value 16 87ab4382d2SGreg Kroah-Hartman */ 88ab4382d2SGreg Kroah-Hartman static unsigned int 89ab4382d2SGreg Kroah-Hartman serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 90ab4382d2SGreg Kroah-Hartman { 91ab4382d2SGreg Kroah-Hartman unsigned int divisor; 92ab4382d2SGreg Kroah-Hartman 93ab4382d2SGreg Kroah-Hartman if (baud > OMAP_MODE13X_SPEED && baud != 3000000) 94ab4382d2SGreg Kroah-Hartman divisor = 13; 95ab4382d2SGreg Kroah-Hartman else 96ab4382d2SGreg Kroah-Hartman divisor = 16; 97ab4382d2SGreg Kroah-Hartman return port->uartclk/(baud * divisor); 98ab4382d2SGreg Kroah-Hartman } 99ab4382d2SGreg Kroah-Hartman 100ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rxdma(struct uart_omap_port *up) 101ab4382d2SGreg Kroah-Hartman { 102ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_used) { 103ab4382d2SGreg Kroah-Hartman del_timer(&up->uart_dma.rx_timer); 104ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.rx_dma_channel); 105ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.rx_dma_channel); 106ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 107ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = false; 108fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 109fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 110ab4382d2SGreg Kroah-Hartman } 111ab4382d2SGreg Kroah-Hartman } 112ab4382d2SGreg Kroah-Hartman 113ab4382d2SGreg Kroah-Hartman static void serial_omap_enable_ms(struct uart_port *port) 114ab4382d2SGreg Kroah-Hartman { 115ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 116ab4382d2SGreg Kroah-Hartman 117ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id); 118fcdca757SGovindraj.R 119fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 120ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 121ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 122fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 123ab4382d2SGreg Kroah-Hartman } 124ab4382d2SGreg Kroah-Hartman 125ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_tx(struct uart_port *port) 126ab4382d2SGreg Kroah-Hartman { 127ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 128ab4382d2SGreg Kroah-Hartman 129ab4382d2SGreg Kroah-Hartman if (up->use_dma && 130ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { 131ab4382d2SGreg Kroah-Hartman /* 132ab4382d2SGreg Kroah-Hartman * Check if dma is still active. If yes do nothing, 133ab4382d2SGreg Kroah-Hartman * return. Else stop dma 134ab4382d2SGreg Kroah-Hartman */ 135ab4382d2SGreg Kroah-Hartman if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel)) 136ab4382d2SGreg Kroah-Hartman return; 137ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 138ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.tx_dma_channel); 139ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 140fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 141fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 142ab4382d2SGreg Kroah-Hartman } 143ab4382d2SGreg Kroah-Hartman 144fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 145ab4382d2SGreg Kroah-Hartman if (up->ier & UART_IER_THRI) { 146ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_THRI; 147ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 148ab4382d2SGreg Kroah-Hartman } 149fcdca757SGovindraj.R 150fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 151fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 152ab4382d2SGreg Kroah-Hartman } 153ab4382d2SGreg Kroah-Hartman 154ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rx(struct uart_port *port) 155ab4382d2SGreg Kroah-Hartman { 156ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 157ab4382d2SGreg Kroah-Hartman 158fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 159ab4382d2SGreg Kroah-Hartman if (up->use_dma) 160ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 161ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_RLSI; 162ab4382d2SGreg Kroah-Hartman up->port.read_status_mask &= ~UART_LSR_DR; 163ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 164fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 165fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 166ab4382d2SGreg Kroah-Hartman } 167ab4382d2SGreg Kroah-Hartman 168ab4382d2SGreg Kroah-Hartman static inline void receive_chars(struct uart_omap_port *up, int *status) 169ab4382d2SGreg Kroah-Hartman { 170ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = up->port.state->port.tty; 171ab4382d2SGreg Kroah-Hartman unsigned int flag; 172ab4382d2SGreg Kroah-Hartman unsigned char ch, lsr = *status; 173ab4382d2SGreg Kroah-Hartman int max_count = 256; 174ab4382d2SGreg Kroah-Hartman 175ab4382d2SGreg Kroah-Hartman do { 176ab4382d2SGreg Kroah-Hartman if (likely(lsr & UART_LSR_DR)) 177ab4382d2SGreg Kroah-Hartman ch = serial_in(up, UART_RX); 178ab4382d2SGreg Kroah-Hartman flag = TTY_NORMAL; 179ab4382d2SGreg Kroah-Hartman up->port.icount.rx++; 180ab4382d2SGreg Kroah-Hartman 181ab4382d2SGreg Kroah-Hartman if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 182ab4382d2SGreg Kroah-Hartman /* 183ab4382d2SGreg Kroah-Hartman * For statistics only 184ab4382d2SGreg Kroah-Hartman */ 185ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) { 186ab4382d2SGreg Kroah-Hartman lsr &= ~(UART_LSR_FE | UART_LSR_PE); 187ab4382d2SGreg Kroah-Hartman up->port.icount.brk++; 188ab4382d2SGreg Kroah-Hartman /* 189ab4382d2SGreg Kroah-Hartman * We do the SysRQ and SAK checking 190ab4382d2SGreg Kroah-Hartman * here because otherwise the break 191ab4382d2SGreg Kroah-Hartman * may get masked by ignore_status_mask 192ab4382d2SGreg Kroah-Hartman * or read_status_mask. 193ab4382d2SGreg Kroah-Hartman */ 194ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&up->port)) 195ab4382d2SGreg Kroah-Hartman goto ignore_char; 196ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_PE) { 197ab4382d2SGreg Kroah-Hartman up->port.icount.parity++; 198ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_FE) { 199ab4382d2SGreg Kroah-Hartman up->port.icount.frame++; 200ab4382d2SGreg Kroah-Hartman } 201ab4382d2SGreg Kroah-Hartman 202ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_OE) 203ab4382d2SGreg Kroah-Hartman up->port.icount.overrun++; 204ab4382d2SGreg Kroah-Hartman 205ab4382d2SGreg Kroah-Hartman /* 206ab4382d2SGreg Kroah-Hartman * Mask off conditions which should be ignored. 207ab4382d2SGreg Kroah-Hartman */ 208ab4382d2SGreg Kroah-Hartman lsr &= up->port.read_status_mask; 209ab4382d2SGreg Kroah-Hartman 210ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 211ab4382d2SGreg Kroah-Hartman if (up->port.line == up->port.cons->index) { 212ab4382d2SGreg Kroah-Hartman /* Recover the break flag from console xmit */ 213ab4382d2SGreg Kroah-Hartman lsr |= up->lsr_break_flag; 214ab4382d2SGreg Kroah-Hartman } 215ab4382d2SGreg Kroah-Hartman #endif 216ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) 217ab4382d2SGreg Kroah-Hartman flag = TTY_BREAK; 218ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_PE) 219ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 220ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_FE) 221ab4382d2SGreg Kroah-Hartman flag = TTY_FRAME; 222ab4382d2SGreg Kroah-Hartman } 223ab4382d2SGreg Kroah-Hartman 224ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&up->port, ch)) 225ab4382d2SGreg Kroah-Hartman goto ignore_char; 226ab4382d2SGreg Kroah-Hartman uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 227ab4382d2SGreg Kroah-Hartman ignore_char: 228ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 229ab4382d2SGreg Kroah-Hartman } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 230ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 231ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(tty); 232ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 233ab4382d2SGreg Kroah-Hartman } 234ab4382d2SGreg Kroah-Hartman 235ab4382d2SGreg Kroah-Hartman static void transmit_chars(struct uart_omap_port *up) 236ab4382d2SGreg Kroah-Hartman { 237ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 238ab4382d2SGreg Kroah-Hartman int count; 239ab4382d2SGreg Kroah-Hartman 240ab4382d2SGreg Kroah-Hartman if (up->port.x_char) { 241ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, up->port.x_char); 242ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 243ab4382d2SGreg Kroah-Hartman up->port.x_char = 0; 244ab4382d2SGreg Kroah-Hartman return; 245ab4382d2SGreg Kroah-Hartman } 246ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 247ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 248ab4382d2SGreg Kroah-Hartman return; 249ab4382d2SGreg Kroah-Hartman } 250ab4382d2SGreg Kroah-Hartman count = up->port.fifosize / 4; 251ab4382d2SGreg Kroah-Hartman do { 252ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, xmit->buf[xmit->tail]); 253ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 254ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 255ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 256ab4382d2SGreg Kroah-Hartman break; 257ab4382d2SGreg Kroah-Hartman } while (--count > 0); 258ab4382d2SGreg Kroah-Hartman 259ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 260ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 261ab4382d2SGreg Kroah-Hartman 262ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 263ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 264ab4382d2SGreg Kroah-Hartman } 265ab4382d2SGreg Kroah-Hartman 266ab4382d2SGreg Kroah-Hartman static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 267ab4382d2SGreg Kroah-Hartman { 268ab4382d2SGreg Kroah-Hartman if (!(up->ier & UART_IER_THRI)) { 269ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_THRI; 270ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 271ab4382d2SGreg Kroah-Hartman } 272ab4382d2SGreg Kroah-Hartman } 273ab4382d2SGreg Kroah-Hartman 274ab4382d2SGreg Kroah-Hartman static void serial_omap_start_tx(struct uart_port *port) 275ab4382d2SGreg Kroah-Hartman { 276ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 277ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit; 278ab4382d2SGreg Kroah-Hartman unsigned int start; 279ab4382d2SGreg Kroah-Hartman int ret = 0; 280ab4382d2SGreg Kroah-Hartman 281ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 282fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 283ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 284fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 285fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 286ab4382d2SGreg Kroah-Hartman return; 287ab4382d2SGreg Kroah-Hartman } 288ab4382d2SGreg Kroah-Hartman 289ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_used) 290ab4382d2SGreg Kroah-Hartman return; 291ab4382d2SGreg Kroah-Hartman 292ab4382d2SGreg Kroah-Hartman xmit = &up->port.state->xmit; 293ab4382d2SGreg Kroah-Hartman 294ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) { 295fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 296ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_tx, 297ab4382d2SGreg Kroah-Hartman "UART Tx DMA", 298ab4382d2SGreg Kroah-Hartman (void *)uart_tx_dma_callback, up, 299ab4382d2SGreg Kroah-Hartman &(up->uart_dma.tx_dma_channel)); 300ab4382d2SGreg Kroah-Hartman 301ab4382d2SGreg Kroah-Hartman if (ret < 0) { 302ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 303ab4382d2SGreg Kroah-Hartman return; 304ab4382d2SGreg Kroah-Hartman } 305ab4382d2SGreg Kroah-Hartman } 306ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 307ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = true; 308ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 309ab4382d2SGreg Kroah-Hartman 310ab4382d2SGreg Kroah-Hartman start = up->uart_dma.tx_buf_dma_phys + 311ab4382d2SGreg Kroah-Hartman (xmit->tail & (UART_XMIT_SIZE - 1)); 312ab4382d2SGreg Kroah-Hartman 313ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 314ab4382d2SGreg Kroah-Hartman /* 315ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 316ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 317ab4382d2SGreg Kroah-Hartman * transfers 318ab4382d2SGreg Kroah-Hartman */ 319ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 320ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 321ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 322ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + 323ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE) - start; 324ab4382d2SGreg Kroah-Hartman 325ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 326ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 327ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 328ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 329ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 330ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 331ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 332ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 333ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 334ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 335ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 336ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 337ab4382d2SGreg Kroah-Hartman } 338ab4382d2SGreg Kroah-Hartman 339ab4382d2SGreg Kroah-Hartman static unsigned int check_modem_status(struct uart_omap_port *up) 340ab4382d2SGreg Kroah-Hartman { 341ab4382d2SGreg Kroah-Hartman unsigned int status; 342ab4382d2SGreg Kroah-Hartman 343ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_MSR); 344ab4382d2SGreg Kroah-Hartman status |= up->msr_saved_flags; 345ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 346ab4382d2SGreg Kroah-Hartman if ((status & UART_MSR_ANY_DELTA) == 0) 347ab4382d2SGreg Kroah-Hartman return status; 348ab4382d2SGreg Kroah-Hartman 349ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 350ab4382d2SGreg Kroah-Hartman up->port.state != NULL) { 351ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_TERI) 352ab4382d2SGreg Kroah-Hartman up->port.icount.rng++; 353ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDSR) 354ab4382d2SGreg Kroah-Hartman up->port.icount.dsr++; 355ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDCD) 356ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change 357ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_DCD); 358ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCTS) 359ab4382d2SGreg Kroah-Hartman uart_handle_cts_change 360ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_CTS); 361ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&up->port.state->port.delta_msr_wait); 362ab4382d2SGreg Kroah-Hartman } 363ab4382d2SGreg Kroah-Hartman 364ab4382d2SGreg Kroah-Hartman return status; 365ab4382d2SGreg Kroah-Hartman } 366ab4382d2SGreg Kroah-Hartman 367ab4382d2SGreg Kroah-Hartman /** 368ab4382d2SGreg Kroah-Hartman * serial_omap_irq() - This handles the interrupt from one port 369ab4382d2SGreg Kroah-Hartman * @irq: uart port irq number 370ab4382d2SGreg Kroah-Hartman * @dev_id: uart port info 371ab4382d2SGreg Kroah-Hartman */ 372ab4382d2SGreg Kroah-Hartman static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) 373ab4382d2SGreg Kroah-Hartman { 374ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = dev_id; 375ab4382d2SGreg Kroah-Hartman unsigned int iir, lsr; 376ab4382d2SGreg Kroah-Hartman unsigned long flags; 377ab4382d2SGreg Kroah-Hartman 378fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 379ab4382d2SGreg Kroah-Hartman iir = serial_in(up, UART_IIR); 380fcdca757SGovindraj.R if (iir & UART_IIR_NO_INT) { 381fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 382fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 383ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 384fcdca757SGovindraj.R } 385ab4382d2SGreg Kroah-Hartman 386ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 387ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 388ab4382d2SGreg Kroah-Hartman if (iir & UART_IIR_RLSI) { 389ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 390ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_DR) 391ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 392ab4382d2SGreg Kroah-Hartman } else { 393ab4382d2SGreg Kroah-Hartman up->ier &= ~(UART_IER_RDI | UART_IER_RLSI); 394ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 395ab4382d2SGreg Kroah-Hartman if ((serial_omap_start_rxdma(up) != 0) && 396ab4382d2SGreg Kroah-Hartman (lsr & UART_LSR_DR)) 397ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 398ab4382d2SGreg Kroah-Hartman } 399ab4382d2SGreg Kroah-Hartman } 400ab4382d2SGreg Kroah-Hartman 401ab4382d2SGreg Kroah-Hartman check_modem_status(up); 402ab4382d2SGreg Kroah-Hartman if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) 403ab4382d2SGreg Kroah-Hartman transmit_chars(up); 404ab4382d2SGreg Kroah-Hartman 405ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 406fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 407fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 408fcdca757SGovindraj.R 409ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 410ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 411ab4382d2SGreg Kroah-Hartman } 412ab4382d2SGreg Kroah-Hartman 413ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_tx_empty(struct uart_port *port) 414ab4382d2SGreg Kroah-Hartman { 415ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 416ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 417ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 418ab4382d2SGreg Kroah-Hartman 419fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 420ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id); 421ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 422ab4382d2SGreg Kroah-Hartman ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 423ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 424fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 425ab4382d2SGreg Kroah-Hartman return ret; 426ab4382d2SGreg Kroah-Hartman } 427ab4382d2SGreg Kroah-Hartman 428ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_get_mctrl(struct uart_port *port) 429ab4382d2SGreg Kroah-Hartman { 430ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 431ab4382d2SGreg Kroah-Hartman unsigned char status; 432ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 433ab4382d2SGreg Kroah-Hartman 434fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 435ab4382d2SGreg Kroah-Hartman status = check_modem_status(up); 436fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 437fcdca757SGovindraj.R 438ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id); 439ab4382d2SGreg Kroah-Hartman 440ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCD) 441ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CAR; 442ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_RI) 443ab4382d2SGreg Kroah-Hartman ret |= TIOCM_RNG; 444ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DSR) 445ab4382d2SGreg Kroah-Hartman ret |= TIOCM_DSR; 446ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_CTS) 447ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CTS; 448ab4382d2SGreg Kroah-Hartman return ret; 449ab4382d2SGreg Kroah-Hartman } 450ab4382d2SGreg Kroah-Hartman 451ab4382d2SGreg Kroah-Hartman static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 452ab4382d2SGreg Kroah-Hartman { 453ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 454ab4382d2SGreg Kroah-Hartman unsigned char mcr = 0; 455ab4382d2SGreg Kroah-Hartman 456ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id); 457ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 458ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_RTS; 459ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_DTR) 460ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_DTR; 461ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT1) 462ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT1; 463ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT2) 464ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT2; 465ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_LOOP) 466ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_LOOP; 467ab4382d2SGreg Kroah-Hartman 468fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 469ab4382d2SGreg Kroah-Hartman mcr |= up->mcr; 470ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, 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)); 545ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timer.function = serial_omap_rx_timeout; 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 unsigned char efr = 0; 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 */ 630ab4382d2SGreg Kroah-Hartman efr = up->efr; 631ab4382d2SGreg Kroah-Hartman efr &= OMAP_UART_SW_CLR; 632ab4382d2SGreg Kroah-Hartman 633ab4382d2SGreg Kroah-Hartman /* 634ab4382d2SGreg Kroah-Hartman * IXON Flag: 635ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 636ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 637ab4382d2SGreg Kroah-Hartman */ 638ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 639ab4382d2SGreg Kroah-Hartman efr |= OMAP_UART_SW_TX; 640ab4382d2SGreg Kroah-Hartman 641ab4382d2SGreg Kroah-Hartman /* 642ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 643ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 644ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 645ab4382d2SGreg Kroah-Hartman */ 646ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 647ab4382d2SGreg Kroah-Hartman efr |= OMAP_UART_SW_RX; 648ab4382d2SGreg Kroah-Hartman 649ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 650ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 651ab4382d2SGreg Kroah-Hartman 652ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 653ab4382d2SGreg Kroah-Hartman 654ab4382d2SGreg Kroah-Hartman /* 655ab4382d2SGreg Kroah-Hartman * IXANY Flag: 656ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 657ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 658ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 659ab4382d2SGreg Kroah-Hartman */ 660ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 661ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 662ab4382d2SGreg Kroah-Hartman 663ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 664ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 665ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 666ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 667ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 668ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 669ab4382d2SGreg Kroah-Hartman */ 670ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_SCD); 671ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 672ab4382d2SGreg Kroah-Hartman 673ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 674ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 675ab4382d2SGreg Kroah-Hartman } 676ab4382d2SGreg Kroah-Hartman 677ab4382d2SGreg Kroah-Hartman static void 678ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 679ab4382d2SGreg Kroah-Hartman struct ktermios *old) 680ab4382d2SGreg Kroah-Hartman { 681ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 682ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 683ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 684ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 685ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 686ab4382d2SGreg Kroah-Hartman 687ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 688ab4382d2SGreg Kroah-Hartman case CS5: 689ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 690ab4382d2SGreg Kroah-Hartman break; 691ab4382d2SGreg Kroah-Hartman case CS6: 692ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 693ab4382d2SGreg Kroah-Hartman break; 694ab4382d2SGreg Kroah-Hartman case CS7: 695ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 696ab4382d2SGreg Kroah-Hartman break; 697ab4382d2SGreg Kroah-Hartman default: 698ab4382d2SGreg Kroah-Hartman case CS8: 699ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 700ab4382d2SGreg Kroah-Hartman break; 701ab4382d2SGreg Kroah-Hartman } 702ab4382d2SGreg Kroah-Hartman 703ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 704ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 705ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 706ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 707ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 708ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 709ab4382d2SGreg Kroah-Hartman 710ab4382d2SGreg Kroah-Hartman /* 711ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 712ab4382d2SGreg Kroah-Hartman */ 713ab4382d2SGreg Kroah-Hartman 714ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 715ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 716ab4382d2SGreg Kroah-Hartman 717ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 718ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 719ab4382d2SGreg Kroah-Hartman if (up->use_dma) 720ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 721ab4382d2SGreg Kroah-Hartman 722ab4382d2SGreg Kroah-Hartman /* 723ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 724ab4382d2SGreg Kroah-Hartman * interrupts disabled. 725ab4382d2SGreg Kroah-Hartman */ 726fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 727ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 728ab4382d2SGreg Kroah-Hartman 729ab4382d2SGreg Kroah-Hartman /* 730ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 731ab4382d2SGreg Kroah-Hartman */ 732ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 733ab4382d2SGreg Kroah-Hartman 734ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 735ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 736ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 737ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 738ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 739ab4382d2SGreg Kroah-Hartman 740ab4382d2SGreg Kroah-Hartman /* 741ab4382d2SGreg Kroah-Hartman * Characters to ignore 742ab4382d2SGreg Kroah-Hartman */ 743ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 744ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 745ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 746ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 747ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 748ab4382d2SGreg Kroah-Hartman /* 749ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 750ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 751ab4382d2SGreg Kroah-Hartman */ 752ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 753ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 754ab4382d2SGreg Kroah-Hartman } 755ab4382d2SGreg Kroah-Hartman 756ab4382d2SGreg Kroah-Hartman /* 757ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 758ab4382d2SGreg Kroah-Hartman */ 759ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 760ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 761ab4382d2SGreg Kroah-Hartman 762ab4382d2SGreg Kroah-Hartman /* 763ab4382d2SGreg Kroah-Hartman * Modem status interrupts 764ab4382d2SGreg Kroah-Hartman */ 765ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 766ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 767ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 768ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 769ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 770ab4382d2SGreg Kroah-Hartman 771ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 772ab4382d2SGreg Kroah-Hartman 773ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 774ab4382d2SGreg Kroah-Hartman * baud clock is not running 775ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 776ab4382d2SGreg Kroah-Hartman */ 777ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 778ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 779ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 780ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 781ab4382d2SGreg Kroah-Hartman 782ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 783ab4382d2SGreg Kroah-Hartman 784ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 785ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 786ab4382d2SGreg Kroah-Hartman 787ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 788ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 789ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 790ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 791ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, up->fcr); 792ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 793ab4382d2SGreg Kroah-Hartman 794ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 795ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TLR, 0); 796ab4382d2SGreg Kroah-Hartman serial_out(up, UART_OMAP_SCR, 797ab4382d2SGreg Kroah-Hartman (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8)); 798ab4382d2SGreg Kroah-Hartman } 799ab4382d2SGreg Kroah-Hartman 800ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 801ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 802ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 803ab4382d2SGreg Kroah-Hartman 804ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 805ab4382d2SGreg Kroah-Hartman 806ab4382d2SGreg Kroah-Hartman serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 807ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 808ab4382d2SGreg Kroah-Hartman 809ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 810ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 811ab4382d2SGreg Kroah-Hartman 812ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 813ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 814ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 815ab4382d2SGreg Kroah-Hartman 816ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ 817ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ 818ab4382d2SGreg Kroah-Hartman 819ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 820ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 821ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 822ab4382d2SGreg Kroah-Hartman 823ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 824ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 825ab4382d2SGreg Kroah-Hartman 826ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 827ab4382d2SGreg Kroah-Hartman serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_13X_MODE); 828ab4382d2SGreg Kroah-Hartman else 829ab4382d2SGreg Kroah-Hartman serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_16X_MODE); 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 832ab4382d2SGreg Kroah-Hartman 833ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 834ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 835ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 836ab4382d2SGreg Kroah-Hartman 837ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 838ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 839ab4382d2SGreg Kroah-Hartman 840ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 841ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 842ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 843ab4382d2SGreg Kroah-Hartman 844ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 845ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 846ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 847ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 848ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 849ab4382d2SGreg Kroah-Hartman } 850ab4382d2SGreg Kroah-Hartman 851ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 852ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 853ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 856fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 857ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id); 858ab4382d2SGreg Kroah-Hartman } 859ab4382d2SGreg Kroah-Hartman 860ab4382d2SGreg Kroah-Hartman static void 861ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 862ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 863ab4382d2SGreg Kroah-Hartman { 864ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 865ab4382d2SGreg Kroah-Hartman unsigned char efr; 866ab4382d2SGreg Kroah-Hartman 867ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id); 868fcdca757SGovindraj.R 869fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 870ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 871ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 872ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 873ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 874ab4382d2SGreg Kroah-Hartman 875ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 876ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 877ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 878ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 879fcdca757SGovindraj.R 880fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 881fcdca757SGovindraj.R if (!state) 882fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 883fcdca757SGovindraj.R else 884fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 885fcdca757SGovindraj.R } 886fcdca757SGovindraj.R 887fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 888ab4382d2SGreg Kroah-Hartman } 889ab4382d2SGreg Kroah-Hartman 890ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 891ab4382d2SGreg Kroah-Hartman { 892ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 893ab4382d2SGreg Kroah-Hartman } 894ab4382d2SGreg Kroah-Hartman 895ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 896ab4382d2SGreg Kroah-Hartman { 897ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 898ab4382d2SGreg Kroah-Hartman return 0; 899ab4382d2SGreg Kroah-Hartman } 900ab4382d2SGreg Kroah-Hartman 901ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 902ab4382d2SGreg Kroah-Hartman { 903ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 904ab4382d2SGreg Kroah-Hartman 905ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 906ab4382d2SGreg Kroah-Hartman up->pdev->id); 907ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 908ab4382d2SGreg Kroah-Hartman } 909ab4382d2SGreg Kroah-Hartman 910ab4382d2SGreg Kroah-Hartman static int 911ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 912ab4382d2SGreg Kroah-Hartman { 913ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 914ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 915ab4382d2SGreg Kroah-Hartman return -EINVAL; 916ab4382d2SGreg Kroah-Hartman } 917ab4382d2SGreg Kroah-Hartman 918ab4382d2SGreg Kroah-Hartman static const char * 919ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 920ab4382d2SGreg Kroah-Hartman { 921ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 922ab4382d2SGreg Kroah-Hartman 923ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id); 924ab4382d2SGreg Kroah-Hartman return up->name; 925ab4382d2SGreg Kroah-Hartman } 926ab4382d2SGreg Kroah-Hartman 927ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 928ab4382d2SGreg Kroah-Hartman 929ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 930ab4382d2SGreg Kroah-Hartman { 931ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 932ab4382d2SGreg Kroah-Hartman 933ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 934ab4382d2SGreg Kroah-Hartman do { 935ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 936ab4382d2SGreg Kroah-Hartman 937ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 938ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 939ab4382d2SGreg Kroah-Hartman 940ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 941ab4382d2SGreg Kroah-Hartman break; 942ab4382d2SGreg Kroah-Hartman udelay(1); 943ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 944ab4382d2SGreg Kroah-Hartman 945ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 946ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 947ab4382d2SGreg Kroah-Hartman tmout = 1000000; 948ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 949ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 950ab4382d2SGreg Kroah-Hartman 951ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 952ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 953ab4382d2SGreg Kroah-Hartman break; 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman udelay(1); 956ab4382d2SGreg Kroah-Hartman } 957ab4382d2SGreg Kroah-Hartman } 958ab4382d2SGreg Kroah-Hartman } 959ab4382d2SGreg Kroah-Hartman 960ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 963ab4382d2SGreg Kroah-Hartman { 964ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 965fcdca757SGovindraj.R 966fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 967ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 968ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 969fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 970ab4382d2SGreg Kroah-Hartman } 971ab4382d2SGreg Kroah-Hartman 972ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 973ab4382d2SGreg Kroah-Hartman { 974ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 975fcdca757SGovindraj.R unsigned int status; 976ab4382d2SGreg Kroah-Hartman 977fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 978fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 979ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 980ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 981ab4382d2SGreg Kroah-Hartman 982fcdca757SGovindraj.R status = serial_in(up, UART_RX); 983fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 984fcdca757SGovindraj.R return status; 985ab4382d2SGreg Kroah-Hartman } 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 988ab4382d2SGreg Kroah-Hartman 989ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 990ab4382d2SGreg Kroah-Hartman 991ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 992ab4382d2SGreg Kroah-Hartman 993ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 994ab4382d2SGreg Kroah-Hartman 995ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 996ab4382d2SGreg Kroah-Hartman { 997ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 998ab4382d2SGreg Kroah-Hartman 999ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1000ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1001ab4382d2SGreg Kroah-Hartman } 1002ab4382d2SGreg Kroah-Hartman 1003ab4382d2SGreg Kroah-Hartman static void 1004ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1005ab4382d2SGreg Kroah-Hartman unsigned int count) 1006ab4382d2SGreg Kroah-Hartman { 1007ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1008ab4382d2SGreg Kroah-Hartman unsigned long flags; 1009ab4382d2SGreg Kroah-Hartman unsigned int ier; 1010ab4382d2SGreg Kroah-Hartman int locked = 1; 1011ab4382d2SGreg Kroah-Hartman 1012fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1013fcdca757SGovindraj.R 1014ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1015ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1016ab4382d2SGreg Kroah-Hartman locked = 0; 1017ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1018ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1019ab4382d2SGreg Kroah-Hartman else 1020ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1021ab4382d2SGreg Kroah-Hartman 1022ab4382d2SGreg Kroah-Hartman /* 1023ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1024ab4382d2SGreg Kroah-Hartman */ 1025ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1026ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1027ab4382d2SGreg Kroah-Hartman 1028ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1029ab4382d2SGreg Kroah-Hartman 1030ab4382d2SGreg Kroah-Hartman /* 1031ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1032ab4382d2SGreg Kroah-Hartman * and restore the IER 1033ab4382d2SGreg Kroah-Hartman */ 1034ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1035ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1036ab4382d2SGreg Kroah-Hartman /* 1037ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1038ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1039ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1040ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1041ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1042ab4382d2SGreg Kroah-Hartman */ 1043ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1044ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1045ab4382d2SGreg Kroah-Hartman 1046fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1047fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1048ab4382d2SGreg Kroah-Hartman if (locked) 1049ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1050ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1051ab4382d2SGreg Kroah-Hartman } 1052ab4382d2SGreg Kroah-Hartman 1053ab4382d2SGreg Kroah-Hartman static int __init 1054ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1055ab4382d2SGreg Kroah-Hartman { 1056ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1057ab4382d2SGreg Kroah-Hartman int baud = 115200; 1058ab4382d2SGreg Kroah-Hartman int bits = 8; 1059ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1060ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1061ab4382d2SGreg Kroah-Hartman 1062ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1063ab4382d2SGreg Kroah-Hartman return -ENODEV; 1064ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1065ab4382d2SGreg Kroah-Hartman 1066ab4382d2SGreg Kroah-Hartman if (options) 1067ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1068ab4382d2SGreg Kroah-Hartman 1069ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1070ab4382d2SGreg Kroah-Hartman } 1071ab4382d2SGreg Kroah-Hartman 1072ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1073ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1074ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1075ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1076ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1077ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1078ab4382d2SGreg Kroah-Hartman .index = -1, 1079ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1080ab4382d2SGreg Kroah-Hartman }; 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1083ab4382d2SGreg Kroah-Hartman { 1084ab4382d2SGreg Kroah-Hartman serial_omap_console_ports[up->pdev->id] = up; 1085ab4382d2SGreg Kroah-Hartman } 1086ab4382d2SGreg Kroah-Hartman 1087ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman #else 1090ab4382d2SGreg Kroah-Hartman 1091ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1092ab4382d2SGreg Kroah-Hartman 1093ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1094ab4382d2SGreg Kroah-Hartman {} 1095ab4382d2SGreg Kroah-Hartman 1096ab4382d2SGreg Kroah-Hartman #endif 1097ab4382d2SGreg Kroah-Hartman 1098ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1099ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1100ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1101ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1102ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1103ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1104ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1105ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1106ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1107ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1108ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1109ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1110ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1111ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1112ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1113ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1114ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1115ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1116ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1117ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1118ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1119ab4382d2SGreg Kroah-Hartman #endif 1120ab4382d2SGreg Kroah-Hartman }; 1121ab4382d2SGreg Kroah-Hartman 1122ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1123ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1124ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1125ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1126ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1127ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1128ab4382d2SGreg Kroah-Hartman }; 1129ab4382d2SGreg Kroah-Hartman 1130fcdca757SGovindraj.R #ifdef CONFIG_SUSPEND 1131fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1132ab4382d2SGreg Kroah-Hartman { 1133fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1134ab4382d2SGreg Kroah-Hartman 1135ab4382d2SGreg Kroah-Hartman if (up) 1136ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 1137ab4382d2SGreg Kroah-Hartman return 0; 1138ab4382d2SGreg Kroah-Hartman } 1139ab4382d2SGreg Kroah-Hartman 1140fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1141ab4382d2SGreg Kroah-Hartman { 1142fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1143ab4382d2SGreg Kroah-Hartman 1144ab4382d2SGreg Kroah-Hartman if (up) 1145ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1146ab4382d2SGreg Kroah-Hartman return 0; 1147ab4382d2SGreg Kroah-Hartman } 1148fcdca757SGovindraj.R #endif 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman static void serial_omap_rx_timeout(unsigned long uart_no) 1151ab4382d2SGreg Kroah-Hartman { 1152ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1153ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1154ab4382d2SGreg Kroah-Hartman int ret = 0; 1155ab4382d2SGreg Kroah-Hartman 1156ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1157ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1158ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1159ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1160ab4382d2SGreg Kroah-Hartman RX_TIMEOUT) { 1161ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1162ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1163ab4382d2SGreg Kroah-Hartman } else { 1164ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1165ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1166ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1167ab4382d2SGreg Kroah-Hartman } 1168ab4382d2SGreg Kroah-Hartman return; 1169ab4382d2SGreg Kroah-Hartman } 1170ab4382d2SGreg Kroah-Hartman 1171ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1172ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1173ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1174ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1175ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1176ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1177ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1178ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1179ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1180ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1181ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1182ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1183ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1184ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1185ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1186ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1187ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1188ab4382d2SGreg Kroah-Hartman } 1189ab4382d2SGreg Kroah-Hartman } else { 1190ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1191ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1192ab4382d2SGreg Kroah-Hartman } 1193ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1194ab4382d2SGreg Kroah-Hartman } 1195ab4382d2SGreg Kroah-Hartman 1196ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1197ab4382d2SGreg Kroah-Hartman { 1198ab4382d2SGreg Kroah-Hartman return; 1199ab4382d2SGreg Kroah-Hartman } 1200ab4382d2SGreg Kroah-Hartman 1201ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1202ab4382d2SGreg Kroah-Hartman { 1203ab4382d2SGreg Kroah-Hartman int ret = 0; 1204ab4382d2SGreg Kroah-Hartman 1205ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1206fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1207ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1208ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1209ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1210ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1211ab4382d2SGreg Kroah-Hartman if (ret < 0) 1212ab4382d2SGreg Kroah-Hartman return ret; 1213ab4382d2SGreg Kroah-Hartman 1214ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1215ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1216ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1217ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1218ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1219ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1220ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1221ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1222ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1223ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1224ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1225ab4382d2SGreg Kroah-Hartman } 1226ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1227ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1228ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1229ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1230ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1231ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1232ab4382d2SGreg Kroah-Hartman return ret; 1233ab4382d2SGreg Kroah-Hartman } 1234ab4382d2SGreg Kroah-Hartman 1235ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1236ab4382d2SGreg Kroah-Hartman { 1237ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1238ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1239ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1240ab4382d2SGreg Kroah-Hartman 1241ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1242ab4382d2SGreg Kroah-Hartman return; 1243ab4382d2SGreg Kroah-Hartman 1244ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1245ab4382d2SGreg Kroah-Hartman /* 1246ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1247ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1248ab4382d2SGreg Kroah-Hartman * transfers 1249ab4382d2SGreg Kroah-Hartman */ 1250ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1251ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1252ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1253ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1254ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1255ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1256ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1257ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1258ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1259ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1260ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1261ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1262ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1263ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1264ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1265ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1266ab4382d2SGreg Kroah-Hartman } 1267ab4382d2SGreg Kroah-Hartman 1268ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1269ab4382d2SGreg Kroah-Hartman { 1270ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1271ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1272ab4382d2SGreg Kroah-Hartman 1273ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1274ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1275ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1276ab4382d2SGreg Kroah-Hartman 1277ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1278ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1279ab4382d2SGreg Kroah-Hartman 1280ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1281ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1282ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1283ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1284ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1285ab4382d2SGreg Kroah-Hartman } else { 1286ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1287ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1288ab4382d2SGreg Kroah-Hartman } 1289ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1290ab4382d2SGreg Kroah-Hartman return; 1291ab4382d2SGreg Kroah-Hartman } 1292ab4382d2SGreg Kroah-Hartman 1293ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1294ab4382d2SGreg Kroah-Hartman { 1295ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1296ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1297ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1298ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1299ab4382d2SGreg Kroah-Hartman 1300ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1301ab4382d2SGreg Kroah-Hartman if (!mem) { 1302ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1303ab4382d2SGreg Kroah-Hartman return -ENODEV; 1304ab4382d2SGreg Kroah-Hartman } 1305ab4382d2SGreg Kroah-Hartman 1306ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1307ab4382d2SGreg Kroah-Hartman if (!irq) { 1308ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1309ab4382d2SGreg Kroah-Hartman return -ENODEV; 1310ab4382d2SGreg Kroah-Hartman } 1311ab4382d2SGreg Kroah-Hartman 131228f65c11SJoe Perches if (!request_mem_region(mem->start, resource_size(mem), 1313ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1314ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1315ab4382d2SGreg Kroah-Hartman return -EBUSY; 1316ab4382d2SGreg Kroah-Hartman } 1317ab4382d2SGreg Kroah-Hartman 1318ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1319ab4382d2SGreg Kroah-Hartman if (!dma_rx) { 1320ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1321ab4382d2SGreg Kroah-Hartman goto err; 1322ab4382d2SGreg Kroah-Hartman } 1323ab4382d2SGreg Kroah-Hartman 1324ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1325ab4382d2SGreg Kroah-Hartman if (!dma_tx) { 1326ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1327ab4382d2SGreg Kroah-Hartman goto err; 1328ab4382d2SGreg Kroah-Hartman } 1329ab4382d2SGreg Kroah-Hartman 1330ab4382d2SGreg Kroah-Hartman up = kzalloc(sizeof(*up), GFP_KERNEL); 1331ab4382d2SGreg Kroah-Hartman if (up == NULL) { 1332ab4382d2SGreg Kroah-Hartman ret = -ENOMEM; 1333ab4382d2SGreg Kroah-Hartman goto do_release_region; 1334ab4382d2SGreg Kroah-Hartman } 1335ab4382d2SGreg Kroah-Hartman sprintf(up->name, "OMAP UART%d", pdev->id); 1336ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1337ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1338ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1339ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1340ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1341ab4382d2SGreg Kroah-Hartman 1342ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1343ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1344ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1345ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1346ab4382d2SGreg Kroah-Hartman 1347edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1348edd70ad7SGovindraj.R up->port.membase = ioremap(mem->start, resource_size(mem)); 1349edd70ad7SGovindraj.R if (!up->port.membase) { 1350edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1351edd70ad7SGovindraj.R ret = -ENOMEM; 1352edd70ad7SGovindraj.R goto err; 1353edd70ad7SGovindraj.R } 1354edd70ad7SGovindraj.R 1355ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1356ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 1357ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 1358ab4382d2SGreg Kroah-Hartman 1359ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1360ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1361ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1362ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1363ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size = 4096; 1364ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timeout = 2; 1365ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1366ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1367ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1368ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1369ab4382d2SGreg Kroah-Hartman } 1370ab4382d2SGreg Kroah-Hartman 1371fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1372fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1373fcdca757SGovindraj.R OMAP_UART_AUTOSUSPEND_DELAY); 1374fcdca757SGovindraj.R 1375fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1376fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1377fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1378fcdca757SGovindraj.R 1379ab4382d2SGreg Kroah-Hartman ui[pdev->id] = up; 1380ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1381ab4382d2SGreg Kroah-Hartman 1382ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1383ab4382d2SGreg Kroah-Hartman if (ret != 0) 1384ab4382d2SGreg Kroah-Hartman goto do_release_region; 1385ab4382d2SGreg Kroah-Hartman 1386fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1387ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1388ab4382d2SGreg Kroah-Hartman return 0; 1389ab4382d2SGreg Kroah-Hartman err: 1390ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1391ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1392ab4382d2SGreg Kroah-Hartman do_release_region: 139328f65c11SJoe Perches release_mem_region(mem->start, resource_size(mem)); 1394ab4382d2SGreg Kroah-Hartman return ret; 1395ab4382d2SGreg Kroah-Hartman } 1396ab4382d2SGreg Kroah-Hartman 1397ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1398ab4382d2SGreg Kroah-Hartman { 1399ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1400ab4382d2SGreg Kroah-Hartman 1401ab4382d2SGreg Kroah-Hartman if (up) { 1402fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1403ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 1404ab4382d2SGreg Kroah-Hartman kfree(up); 1405ab4382d2SGreg Kroah-Hartman } 1406fcdca757SGovindraj.R 1407fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1408ab4382d2SGreg Kroah-Hartman return 0; 1409ab4382d2SGreg Kroah-Hartman } 1410ab4382d2SGreg Kroah-Hartman 1411fcdca757SGovindraj.R #ifdef CONFIG_PM_RUNTIME 1412fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1413fcdca757SGovindraj.R { 1414fcdca757SGovindraj.R return 0; 1415fcdca757SGovindraj.R } 1416fcdca757SGovindraj.R 1417fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1418fcdca757SGovindraj.R { 1419fcdca757SGovindraj.R return 0; 1420fcdca757SGovindraj.R } 1421fcdca757SGovindraj.R #endif 1422fcdca757SGovindraj.R 1423fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1424fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1425fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1426fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1427fcdca757SGovindraj.R }; 1428fcdca757SGovindraj.R 1429ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1430ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1431ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1432ab4382d2SGreg Kroah-Hartman .driver = { 1433ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1434fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1435ab4382d2SGreg Kroah-Hartman }, 1436ab4382d2SGreg Kroah-Hartman }; 1437ab4382d2SGreg Kroah-Hartman 1438ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1439ab4382d2SGreg Kroah-Hartman { 1440ab4382d2SGreg Kroah-Hartman int ret; 1441ab4382d2SGreg Kroah-Hartman 1442ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1443ab4382d2SGreg Kroah-Hartman if (ret != 0) 1444ab4382d2SGreg Kroah-Hartman return ret; 1445ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1446ab4382d2SGreg Kroah-Hartman if (ret != 0) 1447ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1448ab4382d2SGreg Kroah-Hartman return ret; 1449ab4382d2SGreg Kroah-Hartman } 1450ab4382d2SGreg Kroah-Hartman 1451ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1452ab4382d2SGreg Kroah-Hartman { 1453ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1454ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1455ab4382d2SGreg Kroah-Hartman } 1456ab4382d2SGreg Kroah-Hartman 1457ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1458ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1459ab4382d2SGreg Kroah-Hartman 1460ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1461ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1462ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1463