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); 469c538d20cSGovindraj.R up->mcr = serial_in(up, UART_MCR); 470c538d20cSGovindraj.R up->mcr |= mcr; 471c538d20cSGovindraj.R serial_out(up, UART_MCR, up->mcr); 472fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 473ab4382d2SGreg Kroah-Hartman } 474ab4382d2SGreg Kroah-Hartman 475ab4382d2SGreg Kroah-Hartman static void serial_omap_break_ctl(struct uart_port *port, int break_state) 476ab4382d2SGreg Kroah-Hartman { 477ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 478ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 479ab4382d2SGreg Kroah-Hartman 480ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id); 481fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 482ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 483ab4382d2SGreg Kroah-Hartman if (break_state == -1) 484ab4382d2SGreg Kroah-Hartman up->lcr |= UART_LCR_SBC; 485ab4382d2SGreg Kroah-Hartman else 486ab4382d2SGreg Kroah-Hartman up->lcr &= ~UART_LCR_SBC; 487ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 488ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 489fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 490ab4382d2SGreg Kroah-Hartman } 491ab4382d2SGreg Kroah-Hartman 492ab4382d2SGreg Kroah-Hartman static int serial_omap_startup(struct uart_port *port) 493ab4382d2SGreg Kroah-Hartman { 494ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 495ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 496ab4382d2SGreg Kroah-Hartman int retval; 497ab4382d2SGreg Kroah-Hartman 498ab4382d2SGreg Kroah-Hartman /* 499ab4382d2SGreg Kroah-Hartman * Allocate the IRQ 500ab4382d2SGreg Kroah-Hartman */ 501ab4382d2SGreg Kroah-Hartman retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 502ab4382d2SGreg Kroah-Hartman up->name, up); 503ab4382d2SGreg Kroah-Hartman if (retval) 504ab4382d2SGreg Kroah-Hartman return retval; 505ab4382d2SGreg Kroah-Hartman 506ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id); 507ab4382d2SGreg Kroah-Hartman 508fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 509ab4382d2SGreg Kroah-Hartman /* 510ab4382d2SGreg Kroah-Hartman * Clear the FIFO buffers and disable them. 511ab4382d2SGreg Kroah-Hartman * (they will be reenabled in set_termios()) 512ab4382d2SGreg Kroah-Hartman */ 513ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 514ab4382d2SGreg Kroah-Hartman /* For Hardware flow control */ 515ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, UART_MCR_RTS); 516ab4382d2SGreg Kroah-Hartman 517ab4382d2SGreg Kroah-Hartman /* 518ab4382d2SGreg Kroah-Hartman * Clear the interrupt registers. 519ab4382d2SGreg Kroah-Hartman */ 520ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_LSR); 521ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 522ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 523ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_IIR); 524ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_MSR); 525ab4382d2SGreg Kroah-Hartman 526ab4382d2SGreg Kroah-Hartman /* 527ab4382d2SGreg Kroah-Hartman * Now, initialize the UART 528ab4382d2SGreg Kroah-Hartman */ 529ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_WLEN8); 530ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 531ab4382d2SGreg Kroah-Hartman /* 532ab4382d2SGreg Kroah-Hartman * Most PC uarts need OUT2 raised to enable interrupts. 533ab4382d2SGreg Kroah-Hartman */ 534ab4382d2SGreg Kroah-Hartman up->port.mctrl |= TIOCM_OUT2; 535ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 536ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 537ab4382d2SGreg Kroah-Hartman 538ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 539ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 540ab4382d2SGreg Kroah-Hartman free_page((unsigned long)up->port.state->xmit.buf); 541ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = dma_alloc_coherent(NULL, 542ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, 543ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 544ab4382d2SGreg Kroah-Hartman 0); 545ab4382d2SGreg Kroah-Hartman init_timer(&(up->uart_dma.rx_timer)); 546ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timer.function = serial_omap_rx_timeout; 547ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timer.data = up->pdev->id; 548ab4382d2SGreg Kroah-Hartman /* Currently the buffer size is 4KB. Can increase it */ 549ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = dma_alloc_coherent(NULL, 550ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 551ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0); 552ab4382d2SGreg Kroah-Hartman } 553ab4382d2SGreg Kroah-Hartman /* 554ab4382d2SGreg Kroah-Hartman * Finally, enable interrupts. Note: Modem status interrupts 555ab4382d2SGreg Kroah-Hartman * are set via set_termios(), which will be occurring imminently 556ab4382d2SGreg Kroah-Hartman * anyway, so we don't enable them here. 557ab4382d2SGreg Kroah-Hartman */ 558ab4382d2SGreg Kroah-Hartman up->ier = UART_IER_RLSI | UART_IER_RDI; 559ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 560ab4382d2SGreg Kroah-Hartman 56178841462SJarkko Nikula /* Enable module level wake up */ 56278841462SJarkko Nikula serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); 56378841462SJarkko Nikula 564fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 565fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 566ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 567ab4382d2SGreg Kroah-Hartman return 0; 568ab4382d2SGreg Kroah-Hartman } 569ab4382d2SGreg Kroah-Hartman 570ab4382d2SGreg Kroah-Hartman static void serial_omap_shutdown(struct uart_port *port) 571ab4382d2SGreg Kroah-Hartman { 572ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 573ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 574ab4382d2SGreg Kroah-Hartman 575ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id); 576fcdca757SGovindraj.R 577fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 578ab4382d2SGreg Kroah-Hartman /* 579ab4382d2SGreg Kroah-Hartman * Disable interrupts from this port 580ab4382d2SGreg Kroah-Hartman */ 581ab4382d2SGreg Kroah-Hartman up->ier = 0; 582ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 583ab4382d2SGreg Kroah-Hartman 584ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 585ab4382d2SGreg Kroah-Hartman up->port.mctrl &= ~TIOCM_OUT2; 586ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 587ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 588ab4382d2SGreg Kroah-Hartman 589ab4382d2SGreg Kroah-Hartman /* 590ab4382d2SGreg Kroah-Hartman * Disable break condition and FIFOs 591ab4382d2SGreg Kroah-Hartman */ 592ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 593ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 594ab4382d2SGreg Kroah-Hartman 595ab4382d2SGreg Kroah-Hartman /* 596ab4382d2SGreg Kroah-Hartman * Read data port to reset things, and then free the irq 597ab4382d2SGreg Kroah-Hartman */ 598ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 599ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 600ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 601ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 602ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, up->port.state->xmit.buf, 603ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys); 604ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = NULL; 605ab4382d2SGreg Kroah-Hartman serial_omap_stop_rx(port); 606ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 607ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, up->uart_dma.rx_buf, 608ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys); 609ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = NULL; 610ab4382d2SGreg Kroah-Hartman } 611fcdca757SGovindraj.R 612fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 613ab4382d2SGreg Kroah-Hartman free_irq(up->port.irq, up); 614ab4382d2SGreg Kroah-Hartman } 615ab4382d2SGreg Kroah-Hartman 616ab4382d2SGreg Kroah-Hartman static inline void 617ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff 618ab4382d2SGreg Kroah-Hartman (struct uart_omap_port *up, struct ktermios *termios) 619ab4382d2SGreg Kroah-Hartman { 620ab4382d2SGreg Kroah-Hartman up->lcr = serial_in(up, UART_LCR); 621ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 622ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 623ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); 624ab4382d2SGreg Kroah-Hartman 625ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XON1, termios->c_cc[VSTART]); 626ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 627ab4382d2SGreg Kroah-Hartman 628ab4382d2SGreg Kroah-Hartman /* clear SW control mode bits */ 629c538d20cSGovindraj.R up->efr &= OMAP_UART_SW_CLR; 630ab4382d2SGreg Kroah-Hartman 631ab4382d2SGreg Kroah-Hartman /* 632ab4382d2SGreg Kroah-Hartman * IXON Flag: 633ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 634ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 635ab4382d2SGreg Kroah-Hartman */ 636ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 637c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_TX; 638ab4382d2SGreg Kroah-Hartman 639ab4382d2SGreg Kroah-Hartman /* 640ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 641ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 642ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 643ab4382d2SGreg Kroah-Hartman */ 644ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 645c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_RX; 646ab4382d2SGreg Kroah-Hartman 647ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 648ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 649ab4382d2SGreg Kroah-Hartman 650ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 651ab4382d2SGreg Kroah-Hartman 652ab4382d2SGreg Kroah-Hartman /* 653ab4382d2SGreg Kroah-Hartman * IXANY Flag: 654ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 655ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 656ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 657ab4382d2SGreg Kroah-Hartman */ 658ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 659ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 660ab4382d2SGreg Kroah-Hartman 661ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 662ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 663ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 664ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 665ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 666ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 667ab4382d2SGreg Kroah-Hartman */ 668c538d20cSGovindraj.R serial_out(up, UART_EFR, up->efr | UART_EFR_SCD); 669ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 670ab4382d2SGreg Kroah-Hartman 671ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 672ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 673ab4382d2SGreg Kroah-Hartman } 674ab4382d2SGreg Kroah-Hartman 675ab4382d2SGreg Kroah-Hartman static void 676ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 677ab4382d2SGreg Kroah-Hartman struct ktermios *old) 678ab4382d2SGreg Kroah-Hartman { 679ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 680ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 681ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 682ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 683ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 684ab4382d2SGreg Kroah-Hartman 685ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 686ab4382d2SGreg Kroah-Hartman case CS5: 687ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 688ab4382d2SGreg Kroah-Hartman break; 689ab4382d2SGreg Kroah-Hartman case CS6: 690ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 691ab4382d2SGreg Kroah-Hartman break; 692ab4382d2SGreg Kroah-Hartman case CS7: 693ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 694ab4382d2SGreg Kroah-Hartman break; 695ab4382d2SGreg Kroah-Hartman default: 696ab4382d2SGreg Kroah-Hartman case CS8: 697ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 698ab4382d2SGreg Kroah-Hartman break; 699ab4382d2SGreg Kroah-Hartman } 700ab4382d2SGreg Kroah-Hartman 701ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 702ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 703ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 704ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 705ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 706ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 707ab4382d2SGreg Kroah-Hartman 708ab4382d2SGreg Kroah-Hartman /* 709ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 710ab4382d2SGreg Kroah-Hartman */ 711ab4382d2SGreg Kroah-Hartman 712ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 713ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 714ab4382d2SGreg Kroah-Hartman 715c538d20cSGovindraj.R up->dll = quot & 0xff; 716c538d20cSGovindraj.R up->dlh = quot >> 8; 717c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_DISABLE; 718c538d20cSGovindraj.R 719ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 720ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 721ab4382d2SGreg Kroah-Hartman if (up->use_dma) 722ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 723ab4382d2SGreg Kroah-Hartman 724ab4382d2SGreg Kroah-Hartman /* 725ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 726ab4382d2SGreg Kroah-Hartman * interrupts disabled. 727ab4382d2SGreg Kroah-Hartman */ 728fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 729ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 730ab4382d2SGreg Kroah-Hartman 731ab4382d2SGreg Kroah-Hartman /* 732ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 733ab4382d2SGreg Kroah-Hartman */ 734ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 735ab4382d2SGreg Kroah-Hartman 736ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 737ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 738ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 739ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 740ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 741ab4382d2SGreg Kroah-Hartman 742ab4382d2SGreg Kroah-Hartman /* 743ab4382d2SGreg Kroah-Hartman * Characters to ignore 744ab4382d2SGreg Kroah-Hartman */ 745ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 746ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 747ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 748ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 749ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 750ab4382d2SGreg Kroah-Hartman /* 751ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 752ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 753ab4382d2SGreg Kroah-Hartman */ 754ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 755ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 756ab4382d2SGreg Kroah-Hartman } 757ab4382d2SGreg Kroah-Hartman 758ab4382d2SGreg Kroah-Hartman /* 759ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 760ab4382d2SGreg Kroah-Hartman */ 761ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 762ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 763ab4382d2SGreg Kroah-Hartman 764ab4382d2SGreg Kroah-Hartman /* 765ab4382d2SGreg Kroah-Hartman * Modem status interrupts 766ab4382d2SGreg Kroah-Hartman */ 767ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 768ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 769ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 770ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 771ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 772c538d20cSGovindraj.R up->lcr = cval; 77332212897SGovindraj.R up->scr = OMAP_UART_SCR_TX_EMPTY; 774ab4382d2SGreg Kroah-Hartman 775ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 776ab4382d2SGreg Kroah-Hartman 777ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 778ab4382d2SGreg Kroah-Hartman * baud clock is not running 779ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 780ab4382d2SGreg Kroah-Hartman */ 781ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 782ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 783ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 784ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 785ab4382d2SGreg Kroah-Hartman 786ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 787ab4382d2SGreg Kroah-Hartman 788ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 789ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 790ab4382d2SGreg Kroah-Hartman 791ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 792ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 793ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 794ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 795ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, up->fcr); 796ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 797ab4382d2SGreg Kroah-Hartman 798ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 799ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TLR, 0); 800c538d20cSGovindraj.R up->scr |= (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8); 801ab4382d2SGreg Kroah-Hartman } 802ab4382d2SGreg Kroah-Hartman 803c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 804c538d20cSGovindraj.R 805ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 806ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 807ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 808ab4382d2SGreg Kroah-Hartman 809ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 810ab4382d2SGreg Kroah-Hartman 811c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 812ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 813ab4382d2SGreg Kroah-Hartman 814ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 815ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 816ab4382d2SGreg Kroah-Hartman 817ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 818ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 819ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 820ab4382d2SGreg Kroah-Hartman 821c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 822c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 823ab4382d2SGreg Kroah-Hartman 824ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 825ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 826ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 827ab4382d2SGreg Kroah-Hartman 828ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 829ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 832c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_13X_MODE; 833ab4382d2SGreg Kroah-Hartman else 834c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_16X_MODE; 835c538d20cSGovindraj.R 836c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 837ab4382d2SGreg Kroah-Hartman 838ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 839ab4382d2SGreg Kroah-Hartman 840ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 841ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 842ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 843ab4382d2SGreg Kroah-Hartman 844ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 845ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 846ab4382d2SGreg Kroah-Hartman 847ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 848ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 849ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 850ab4382d2SGreg Kroah-Hartman 851ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 852ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 853ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 854ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 855ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 856ab4382d2SGreg Kroah-Hartman } 857ab4382d2SGreg Kroah-Hartman 858ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 859ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 860ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 861ab4382d2SGreg Kroah-Hartman 862ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 863fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 864ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id); 865ab4382d2SGreg Kroah-Hartman } 866ab4382d2SGreg Kroah-Hartman 867ab4382d2SGreg Kroah-Hartman static void 868ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 869ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 870ab4382d2SGreg Kroah-Hartman { 871ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 872ab4382d2SGreg Kroah-Hartman unsigned char efr; 873ab4382d2SGreg Kroah-Hartman 874ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id); 875fcdca757SGovindraj.R 876fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 877ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 878ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 879ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 880ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 881ab4382d2SGreg Kroah-Hartman 882ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 883ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 884ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 885ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 886fcdca757SGovindraj.R 887fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 888fcdca757SGovindraj.R if (!state) 889fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 890fcdca757SGovindraj.R else 891fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 892fcdca757SGovindraj.R } 893fcdca757SGovindraj.R 894fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 895ab4382d2SGreg Kroah-Hartman } 896ab4382d2SGreg Kroah-Hartman 897ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 898ab4382d2SGreg Kroah-Hartman { 899ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 900ab4382d2SGreg Kroah-Hartman } 901ab4382d2SGreg Kroah-Hartman 902ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 903ab4382d2SGreg Kroah-Hartman { 904ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 905ab4382d2SGreg Kroah-Hartman return 0; 906ab4382d2SGreg Kroah-Hartman } 907ab4382d2SGreg Kroah-Hartman 908ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 909ab4382d2SGreg Kroah-Hartman { 910ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 911ab4382d2SGreg Kroah-Hartman 912ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 913ab4382d2SGreg Kroah-Hartman up->pdev->id); 914ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 915ab4382d2SGreg Kroah-Hartman } 916ab4382d2SGreg Kroah-Hartman 917ab4382d2SGreg Kroah-Hartman static int 918ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 919ab4382d2SGreg Kroah-Hartman { 920ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 921ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 922ab4382d2SGreg Kroah-Hartman return -EINVAL; 923ab4382d2SGreg Kroah-Hartman } 924ab4382d2SGreg Kroah-Hartman 925ab4382d2SGreg Kroah-Hartman static const char * 926ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 927ab4382d2SGreg Kroah-Hartman { 928ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 929ab4382d2SGreg Kroah-Hartman 930ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id); 931ab4382d2SGreg Kroah-Hartman return up->name; 932ab4382d2SGreg Kroah-Hartman } 933ab4382d2SGreg Kroah-Hartman 934ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 935ab4382d2SGreg Kroah-Hartman 936ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 937ab4382d2SGreg Kroah-Hartman { 938ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 939ab4382d2SGreg Kroah-Hartman 940ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 941ab4382d2SGreg Kroah-Hartman do { 942ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 943ab4382d2SGreg Kroah-Hartman 944ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 945ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 946ab4382d2SGreg Kroah-Hartman 947ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 948ab4382d2SGreg Kroah-Hartman break; 949ab4382d2SGreg Kroah-Hartman udelay(1); 950ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 951ab4382d2SGreg Kroah-Hartman 952ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 953ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 954ab4382d2SGreg Kroah-Hartman tmout = 1000000; 955ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 956ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 957ab4382d2SGreg Kroah-Hartman 958ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 959ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 960ab4382d2SGreg Kroah-Hartman break; 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman udelay(1); 963ab4382d2SGreg Kroah-Hartman } 964ab4382d2SGreg Kroah-Hartman } 965ab4382d2SGreg Kroah-Hartman } 966ab4382d2SGreg Kroah-Hartman 967ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 968ab4382d2SGreg Kroah-Hartman 969ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 970ab4382d2SGreg Kroah-Hartman { 971ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 972fcdca757SGovindraj.R 973fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 974ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 975ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 976fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 977ab4382d2SGreg Kroah-Hartman } 978ab4382d2SGreg Kroah-Hartman 979ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 980ab4382d2SGreg Kroah-Hartman { 981ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 982fcdca757SGovindraj.R unsigned int status; 983ab4382d2SGreg Kroah-Hartman 984fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 985fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 986ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 987ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 988ab4382d2SGreg Kroah-Hartman 989fcdca757SGovindraj.R status = serial_in(up, UART_RX); 990fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 991fcdca757SGovindraj.R return status; 992ab4382d2SGreg Kroah-Hartman } 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 995ab4382d2SGreg Kroah-Hartman 996ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 997ab4382d2SGreg Kroah-Hartman 998ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 999ab4382d2SGreg Kroah-Hartman 1000ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 1001ab4382d2SGreg Kroah-Hartman 1002ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 1003ab4382d2SGreg Kroah-Hartman { 1004ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1005ab4382d2SGreg Kroah-Hartman 1006ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1007ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1008ab4382d2SGreg Kroah-Hartman } 1009ab4382d2SGreg Kroah-Hartman 1010ab4382d2SGreg Kroah-Hartman static void 1011ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1012ab4382d2SGreg Kroah-Hartman unsigned int count) 1013ab4382d2SGreg Kroah-Hartman { 1014ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1015ab4382d2SGreg Kroah-Hartman unsigned long flags; 1016ab4382d2SGreg Kroah-Hartman unsigned int ier; 1017ab4382d2SGreg Kroah-Hartman int locked = 1; 1018ab4382d2SGreg Kroah-Hartman 1019fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1020fcdca757SGovindraj.R 1021ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1022ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1023ab4382d2SGreg Kroah-Hartman locked = 0; 1024ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1025ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1026ab4382d2SGreg Kroah-Hartman else 1027ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1028ab4382d2SGreg Kroah-Hartman 1029ab4382d2SGreg Kroah-Hartman /* 1030ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1031ab4382d2SGreg Kroah-Hartman */ 1032ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1033ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1034ab4382d2SGreg Kroah-Hartman 1035ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1036ab4382d2SGreg Kroah-Hartman 1037ab4382d2SGreg Kroah-Hartman /* 1038ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1039ab4382d2SGreg Kroah-Hartman * and restore the IER 1040ab4382d2SGreg Kroah-Hartman */ 1041ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1042ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1043ab4382d2SGreg Kroah-Hartman /* 1044ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1045ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1046ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1047ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1048ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1049ab4382d2SGreg Kroah-Hartman */ 1050ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1051ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1052ab4382d2SGreg Kroah-Hartman 1053fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1054fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1055ab4382d2SGreg Kroah-Hartman if (locked) 1056ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1057ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1058ab4382d2SGreg Kroah-Hartman } 1059ab4382d2SGreg Kroah-Hartman 1060ab4382d2SGreg Kroah-Hartman static int __init 1061ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1062ab4382d2SGreg Kroah-Hartman { 1063ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1064ab4382d2SGreg Kroah-Hartman int baud = 115200; 1065ab4382d2SGreg Kroah-Hartman int bits = 8; 1066ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1067ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1068ab4382d2SGreg Kroah-Hartman 1069ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1070ab4382d2SGreg Kroah-Hartman return -ENODEV; 1071ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1072ab4382d2SGreg Kroah-Hartman 1073ab4382d2SGreg Kroah-Hartman if (options) 1074ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1075ab4382d2SGreg Kroah-Hartman 1076ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1077ab4382d2SGreg Kroah-Hartman } 1078ab4382d2SGreg Kroah-Hartman 1079ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1080ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1081ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1082ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1083ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1084ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1085ab4382d2SGreg Kroah-Hartman .index = -1, 1086ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1087ab4382d2SGreg Kroah-Hartman }; 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1090ab4382d2SGreg Kroah-Hartman { 1091ab4382d2SGreg Kroah-Hartman serial_omap_console_ports[up->pdev->id] = up; 1092ab4382d2SGreg Kroah-Hartman } 1093ab4382d2SGreg Kroah-Hartman 1094ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1095ab4382d2SGreg Kroah-Hartman 1096ab4382d2SGreg Kroah-Hartman #else 1097ab4382d2SGreg Kroah-Hartman 1098ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1099ab4382d2SGreg Kroah-Hartman 1100ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1101ab4382d2SGreg Kroah-Hartman {} 1102ab4382d2SGreg Kroah-Hartman 1103ab4382d2SGreg Kroah-Hartman #endif 1104ab4382d2SGreg Kroah-Hartman 1105ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1106ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1107ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1108ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1109ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1110ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1111ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1112ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1113ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1114ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1115ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1116ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1117ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1118ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1119ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1120ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1121ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1122ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1123ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1124ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1125ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1126ab4382d2SGreg Kroah-Hartman #endif 1127ab4382d2SGreg Kroah-Hartman }; 1128ab4382d2SGreg Kroah-Hartman 1129ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1130ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1131ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1132ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1133ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1134ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1135ab4382d2SGreg Kroah-Hartman }; 1136ab4382d2SGreg Kroah-Hartman 1137fcdca757SGovindraj.R #ifdef CONFIG_SUSPEND 1138fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1139ab4382d2SGreg Kroah-Hartman { 1140fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1141ab4382d2SGreg Kroah-Hartman 1142ab4382d2SGreg Kroah-Hartman if (up) 1143ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 1144ab4382d2SGreg Kroah-Hartman return 0; 1145ab4382d2SGreg Kroah-Hartman } 1146ab4382d2SGreg Kroah-Hartman 1147fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1148ab4382d2SGreg Kroah-Hartman { 1149fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1150ab4382d2SGreg Kroah-Hartman 1151ab4382d2SGreg Kroah-Hartman if (up) 1152ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1153ab4382d2SGreg Kroah-Hartman return 0; 1154ab4382d2SGreg Kroah-Hartman } 1155fcdca757SGovindraj.R #endif 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman static void serial_omap_rx_timeout(unsigned long uart_no) 1158ab4382d2SGreg Kroah-Hartman { 1159ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1160ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1161ab4382d2SGreg Kroah-Hartman int ret = 0; 1162ab4382d2SGreg Kroah-Hartman 1163ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1164ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1165ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1166ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1167ab4382d2SGreg Kroah-Hartman RX_TIMEOUT) { 1168ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1169ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1170ab4382d2SGreg Kroah-Hartman } else { 1171ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1172ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1173ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1174ab4382d2SGreg Kroah-Hartman } 1175ab4382d2SGreg Kroah-Hartman return; 1176ab4382d2SGreg Kroah-Hartman } 1177ab4382d2SGreg Kroah-Hartman 1178ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1179ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1180ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1181ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1182ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1183ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1184ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1185ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1186ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1187ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1188ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1189ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1190ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1191ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1192ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1193ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1194ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1195ab4382d2SGreg Kroah-Hartman } 1196ab4382d2SGreg Kroah-Hartman } else { 1197ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1198ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1199ab4382d2SGreg Kroah-Hartman } 1200ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1201ab4382d2SGreg Kroah-Hartman } 1202ab4382d2SGreg Kroah-Hartman 1203ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1204ab4382d2SGreg Kroah-Hartman { 1205ab4382d2SGreg Kroah-Hartman return; 1206ab4382d2SGreg Kroah-Hartman } 1207ab4382d2SGreg Kroah-Hartman 1208ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1209ab4382d2SGreg Kroah-Hartman { 1210ab4382d2SGreg Kroah-Hartman int ret = 0; 1211ab4382d2SGreg Kroah-Hartman 1212ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1213fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1214ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1215ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1216ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1217ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1218ab4382d2SGreg Kroah-Hartman if (ret < 0) 1219ab4382d2SGreg Kroah-Hartman return ret; 1220ab4382d2SGreg Kroah-Hartman 1221ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1222ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1223ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1224ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1225ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1226ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1227ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1228ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1229ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1230ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1231ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1232ab4382d2SGreg Kroah-Hartman } 1233ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1234ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1235ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1236ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1237ab4382d2SGreg Kroah-Hartman usecs_to_jiffies(up->uart_dma.rx_timeout)); 1238ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1239ab4382d2SGreg Kroah-Hartman return ret; 1240ab4382d2SGreg Kroah-Hartman } 1241ab4382d2SGreg Kroah-Hartman 1242ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1243ab4382d2SGreg Kroah-Hartman { 1244ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1245ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1246ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1247ab4382d2SGreg Kroah-Hartman 1248ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1249ab4382d2SGreg Kroah-Hartman return; 1250ab4382d2SGreg Kroah-Hartman 1251ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1252ab4382d2SGreg Kroah-Hartman /* 1253ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1254ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1255ab4382d2SGreg Kroah-Hartman * transfers 1256ab4382d2SGreg Kroah-Hartman */ 1257ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1258ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1259ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1260ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1261ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1262ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1263ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1264ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1265ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1266ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1267ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1268ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1269ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1270ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1271ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1272ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1273ab4382d2SGreg Kroah-Hartman } 1274ab4382d2SGreg Kroah-Hartman 1275ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1276ab4382d2SGreg Kroah-Hartman { 1277ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1278ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1279ab4382d2SGreg Kroah-Hartman 1280ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1281ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1282ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1283ab4382d2SGreg Kroah-Hartman 1284ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1285ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1286ab4382d2SGreg Kroah-Hartman 1287ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1288ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1289ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1290ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1291ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1292ab4382d2SGreg Kroah-Hartman } else { 1293ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1294ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1295ab4382d2SGreg Kroah-Hartman } 1296ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1297ab4382d2SGreg Kroah-Hartman return; 1298ab4382d2SGreg Kroah-Hartman } 1299ab4382d2SGreg Kroah-Hartman 1300ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1301ab4382d2SGreg Kroah-Hartman { 1302ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1303ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1304ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1305ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1306ab4382d2SGreg Kroah-Hartman 1307ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1308ab4382d2SGreg Kroah-Hartman if (!mem) { 1309ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1310ab4382d2SGreg Kroah-Hartman return -ENODEV; 1311ab4382d2SGreg Kroah-Hartman } 1312ab4382d2SGreg Kroah-Hartman 1313ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1314ab4382d2SGreg Kroah-Hartman if (!irq) { 1315ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1316ab4382d2SGreg Kroah-Hartman return -ENODEV; 1317ab4382d2SGreg Kroah-Hartman } 1318ab4382d2SGreg Kroah-Hartman 131928f65c11SJoe Perches if (!request_mem_region(mem->start, resource_size(mem), 1320ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1321ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1322ab4382d2SGreg Kroah-Hartman return -EBUSY; 1323ab4382d2SGreg Kroah-Hartman } 1324ab4382d2SGreg Kroah-Hartman 1325ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1326ab4382d2SGreg Kroah-Hartman if (!dma_rx) { 1327ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1328ab4382d2SGreg Kroah-Hartman goto err; 1329ab4382d2SGreg Kroah-Hartman } 1330ab4382d2SGreg Kroah-Hartman 1331ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1332ab4382d2SGreg Kroah-Hartman if (!dma_tx) { 1333ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1334ab4382d2SGreg Kroah-Hartman goto err; 1335ab4382d2SGreg Kroah-Hartman } 1336ab4382d2SGreg Kroah-Hartman 1337ab4382d2SGreg Kroah-Hartman up = kzalloc(sizeof(*up), GFP_KERNEL); 1338ab4382d2SGreg Kroah-Hartman if (up == NULL) { 1339ab4382d2SGreg Kroah-Hartman ret = -ENOMEM; 1340ab4382d2SGreg Kroah-Hartman goto do_release_region; 1341ab4382d2SGreg Kroah-Hartman } 1342ab4382d2SGreg Kroah-Hartman sprintf(up->name, "OMAP UART%d", pdev->id); 1343ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1344ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1345ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1346ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1347ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1348ab4382d2SGreg Kroah-Hartman 1349ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1350ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1351ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1352ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1353ab4382d2SGreg Kroah-Hartman 1354edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1355edd70ad7SGovindraj.R up->port.membase = ioremap(mem->start, resource_size(mem)); 1356edd70ad7SGovindraj.R if (!up->port.membase) { 1357edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1358edd70ad7SGovindraj.R ret = -ENOMEM; 1359edd70ad7SGovindraj.R goto err; 1360edd70ad7SGovindraj.R } 1361edd70ad7SGovindraj.R 1362ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1363ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 1364ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 1365ab4382d2SGreg Kroah-Hartman 1366ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1367ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1368ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1369ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1370ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size = 4096; 1371ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_timeout = 2; 1372ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1373ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1374ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1375ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1376ab4382d2SGreg Kroah-Hartman } 1377ab4382d2SGreg Kroah-Hartman 1378fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1379fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1380fcdca757SGovindraj.R OMAP_UART_AUTOSUSPEND_DELAY); 1381fcdca757SGovindraj.R 1382fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1383fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1384fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1385fcdca757SGovindraj.R 1386ab4382d2SGreg Kroah-Hartman ui[pdev->id] = up; 1387ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1388ab4382d2SGreg Kroah-Hartman 1389ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1390ab4382d2SGreg Kroah-Hartman if (ret != 0) 1391ab4382d2SGreg Kroah-Hartman goto do_release_region; 1392ab4382d2SGreg Kroah-Hartman 1393fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1394ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1395ab4382d2SGreg Kroah-Hartman return 0; 1396ab4382d2SGreg Kroah-Hartman err: 1397ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1398ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1399ab4382d2SGreg Kroah-Hartman do_release_region: 140028f65c11SJoe Perches release_mem_region(mem->start, resource_size(mem)); 1401ab4382d2SGreg Kroah-Hartman return ret; 1402ab4382d2SGreg Kroah-Hartman } 1403ab4382d2SGreg Kroah-Hartman 1404ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1405ab4382d2SGreg Kroah-Hartman { 1406ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1407ab4382d2SGreg Kroah-Hartman 1408ab4382d2SGreg Kroah-Hartman if (up) { 1409fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1410ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 1411ab4382d2SGreg Kroah-Hartman kfree(up); 1412ab4382d2SGreg Kroah-Hartman } 1413fcdca757SGovindraj.R 1414fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1415ab4382d2SGreg Kroah-Hartman return 0; 1416ab4382d2SGreg Kroah-Hartman } 1417ab4382d2SGreg Kroah-Hartman 14189f9ac1e8SGovindraj.R static void serial_omap_restore_context(struct uart_omap_port *up) 14199f9ac1e8SGovindraj.R { 14209f9ac1e8SGovindraj.R serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 14219f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 14229f9ac1e8SGovindraj.R serial_out(up, UART_EFR, UART_EFR_ECB); 14239f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 14249f9ac1e8SGovindraj.R serial_out(up, UART_IER, 0x0); 14259f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1426c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); 1427c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); 14289f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 14299f9ac1e8SGovindraj.R serial_out(up, UART_IER, up->ier); 14309f9ac1e8SGovindraj.R serial_out(up, UART_FCR, up->fcr); 14319f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 14329f9ac1e8SGovindraj.R serial_out(up, UART_MCR, up->mcr); 14339f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1434c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 14359f9ac1e8SGovindraj.R serial_out(up, UART_EFR, up->efr); 14369f9ac1e8SGovindraj.R serial_out(up, UART_LCR, up->lcr); 1437c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 14389f9ac1e8SGovindraj.R } 14399f9ac1e8SGovindraj.R 1440fcdca757SGovindraj.R #ifdef CONFIG_PM_RUNTIME 1441fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1442fcdca757SGovindraj.R { 1443fcdca757SGovindraj.R return 0; 1444fcdca757SGovindraj.R } 1445fcdca757SGovindraj.R 1446fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1447fcdca757SGovindraj.R { 14489f9ac1e8SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 14499f9ac1e8SGovindraj.R 14509f9ac1e8SGovindraj.R if (up) 14519f9ac1e8SGovindraj.R serial_omap_restore_context(up); 14529f9ac1e8SGovindraj.R 1453fcdca757SGovindraj.R return 0; 1454fcdca757SGovindraj.R } 1455fcdca757SGovindraj.R #endif 1456fcdca757SGovindraj.R 1457fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1458fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1459fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1460fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1461fcdca757SGovindraj.R }; 1462fcdca757SGovindraj.R 1463ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1464ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1465ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1466ab4382d2SGreg Kroah-Hartman .driver = { 1467ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1468fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1469ab4382d2SGreg Kroah-Hartman }, 1470ab4382d2SGreg Kroah-Hartman }; 1471ab4382d2SGreg Kroah-Hartman 1472ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1473ab4382d2SGreg Kroah-Hartman { 1474ab4382d2SGreg Kroah-Hartman int ret; 1475ab4382d2SGreg Kroah-Hartman 1476ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1477ab4382d2SGreg Kroah-Hartman if (ret != 0) 1478ab4382d2SGreg Kroah-Hartman return ret; 1479ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1480ab4382d2SGreg Kroah-Hartman if (ret != 0) 1481ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1482ab4382d2SGreg Kroah-Hartman return ret; 1483ab4382d2SGreg Kroah-Hartman } 1484ab4382d2SGreg Kroah-Hartman 1485ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1486ab4382d2SGreg Kroah-Hartman { 1487ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1488ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1489ab4382d2SGreg Kroah-Hartman } 1490ab4382d2SGreg Kroah-Hartman 1491ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1492ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1493ab4382d2SGreg Kroah-Hartman 1494ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1495ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1496ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1497