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> 41d92b0dfcSRajendra Nayak #include <linux/of.h> 42ab4382d2SGreg Kroah-Hartman 43ab4382d2SGreg Kroah-Hartman #include <plat/dma.h> 44ab4382d2SGreg Kroah-Hartman #include <plat/dmtimer.h> 45ab4382d2SGreg Kroah-Hartman #include <plat/omap-serial.h> 46ab4382d2SGreg Kroah-Hartman 478fe789dcSRajendra Nayak #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/ 488fe789dcSRajendra Nayak 490ba5f668SPaul Walmsley /* SCR register bitmasks */ 500ba5f668SPaul Walmsley #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) 510ba5f668SPaul Walmsley 520ba5f668SPaul Walmsley /* FCR register bitmasks */ 530ba5f668SPaul Walmsley #define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT 6 540ba5f668SPaul Walmsley #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) 550ba5f668SPaul Walmsley 56ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 57ab4382d2SGreg Kroah-Hartman 58ab4382d2SGreg Kroah-Hartman /* Forward declaration of functions */ 59ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data); 60a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no); 61ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up); 6294734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 63ab4382d2SGreg Kroah-Hartman 642fd14964SGovindraj.R static struct workqueue_struct *serial_omap_uart_wq; 65ab4382d2SGreg Kroah-Hartman 66ab4382d2SGreg Kroah-Hartman static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 67ab4382d2SGreg Kroah-Hartman { 68ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 69ab4382d2SGreg Kroah-Hartman return readw(up->port.membase + offset); 70ab4382d2SGreg Kroah-Hartman } 71ab4382d2SGreg Kroah-Hartman 72ab4382d2SGreg Kroah-Hartman static inline void serial_out(struct uart_omap_port *up, int offset, int value) 73ab4382d2SGreg Kroah-Hartman { 74ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 75ab4382d2SGreg Kroah-Hartman writew(value, up->port.membase + offset); 76ab4382d2SGreg Kroah-Hartman } 77ab4382d2SGreg Kroah-Hartman 78ab4382d2SGreg Kroah-Hartman static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 79ab4382d2SGreg Kroah-Hartman { 80ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 81ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 82ab4382d2SGreg Kroah-Hartman UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 83ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, 0); 84ab4382d2SGreg Kroah-Hartman } 85ab4382d2SGreg Kroah-Hartman 86ab4382d2SGreg Kroah-Hartman /* 87ab4382d2SGreg Kroah-Hartman * serial_omap_get_divisor - calculate divisor value 88ab4382d2SGreg Kroah-Hartman * @port: uart port info 89ab4382d2SGreg Kroah-Hartman * @baud: baudrate for which divisor needs to be calculated. 90ab4382d2SGreg Kroah-Hartman * 91ab4382d2SGreg Kroah-Hartman * We have written our own function to get the divisor so as to support 92ab4382d2SGreg Kroah-Hartman * 13x mode. 3Mbps Baudrate as an different divisor. 93ab4382d2SGreg Kroah-Hartman * Reference OMAP TRM Chapter 17: 94ab4382d2SGreg Kroah-Hartman * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates 95ab4382d2SGreg Kroah-Hartman * referring to oversampling - divisor value 96ab4382d2SGreg Kroah-Hartman * baudrate 460,800 to 3,686,400 all have divisor 13 97ab4382d2SGreg Kroah-Hartman * except 3,000,000 which has divisor value 16 98ab4382d2SGreg Kroah-Hartman */ 99ab4382d2SGreg Kroah-Hartman static unsigned int 100ab4382d2SGreg Kroah-Hartman serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 101ab4382d2SGreg Kroah-Hartman { 102ab4382d2SGreg Kroah-Hartman unsigned int divisor; 103ab4382d2SGreg Kroah-Hartman 104ab4382d2SGreg Kroah-Hartman if (baud > OMAP_MODE13X_SPEED && baud != 3000000) 105ab4382d2SGreg Kroah-Hartman divisor = 13; 106ab4382d2SGreg Kroah-Hartman else 107ab4382d2SGreg Kroah-Hartman divisor = 16; 108ab4382d2SGreg Kroah-Hartman return port->uartclk/(baud * divisor); 109ab4382d2SGreg Kroah-Hartman } 110ab4382d2SGreg Kroah-Hartman 111ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rxdma(struct uart_omap_port *up) 112ab4382d2SGreg Kroah-Hartman { 113ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_used) { 114ab4382d2SGreg Kroah-Hartman del_timer(&up->uart_dma.rx_timer); 115ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.rx_dma_channel); 116ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.rx_dma_channel); 117ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 118ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = false; 119fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 120fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 121ab4382d2SGreg Kroah-Hartman } 122ab4382d2SGreg Kroah-Hartman } 123ab4382d2SGreg Kroah-Hartman 124ab4382d2SGreg Kroah-Hartman static void serial_omap_enable_ms(struct uart_port *port) 125ab4382d2SGreg Kroah-Hartman { 126ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 127ab4382d2SGreg Kroah-Hartman 128ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 129fcdca757SGovindraj.R 130fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 131ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 132ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 133fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 134ab4382d2SGreg Kroah-Hartman } 135ab4382d2SGreg Kroah-Hartman 136ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_tx(struct uart_port *port) 137ab4382d2SGreg Kroah-Hartman { 138ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 139be4b0281SPaul Walmsley struct omap_uart_port_info *pdata = up->pdev->dev.platform_data; 140ab4382d2SGreg Kroah-Hartman 141ab4382d2SGreg Kroah-Hartman if (up->use_dma && 142ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { 143ab4382d2SGreg Kroah-Hartman /* 144ab4382d2SGreg Kroah-Hartman * Check if dma is still active. If yes do nothing, 145ab4382d2SGreg Kroah-Hartman * return. Else stop dma 146ab4382d2SGreg Kroah-Hartman */ 147ab4382d2SGreg Kroah-Hartman if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel)) 148ab4382d2SGreg Kroah-Hartman return; 149ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 150ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.tx_dma_channel); 151ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 152fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 153fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 154ab4382d2SGreg Kroah-Hartman } 155ab4382d2SGreg Kroah-Hartman 156fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 157ab4382d2SGreg Kroah-Hartman if (up->ier & UART_IER_THRI) { 158ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_THRI; 159ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 160ab4382d2SGreg Kroah-Hartman } 161fcdca757SGovindraj.R 162be4b0281SPaul Walmsley if (!up->use_dma && pdata->set_forceidle) 163be4b0281SPaul Walmsley pdata->set_forceidle(up->pdev); 164be4b0281SPaul Walmsley 165fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 166fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 167ab4382d2SGreg Kroah-Hartman } 168ab4382d2SGreg Kroah-Hartman 169ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rx(struct uart_port *port) 170ab4382d2SGreg Kroah-Hartman { 171ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 172ab4382d2SGreg Kroah-Hartman 173fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 174ab4382d2SGreg Kroah-Hartman if (up->use_dma) 175ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 176ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_RLSI; 177ab4382d2SGreg Kroah-Hartman up->port.read_status_mask &= ~UART_LSR_DR; 178ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 179fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 180fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 181ab4382d2SGreg Kroah-Hartman } 182ab4382d2SGreg Kroah-Hartman 183da274686SGovindraj.R static inline void receive_chars(struct uart_omap_port *up, 184da274686SGovindraj.R unsigned int *status) 185ab4382d2SGreg Kroah-Hartman { 186ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = up->port.state->port.tty; 187da274686SGovindraj.R unsigned int flag, lsr = *status; 188da274686SGovindraj.R unsigned char ch = 0; 189ab4382d2SGreg Kroah-Hartman int max_count = 256; 190ab4382d2SGreg Kroah-Hartman 191ab4382d2SGreg Kroah-Hartman do { 192ab4382d2SGreg Kroah-Hartman if (likely(lsr & UART_LSR_DR)) 193ab4382d2SGreg Kroah-Hartman ch = serial_in(up, UART_RX); 194ab4382d2SGreg Kroah-Hartman flag = TTY_NORMAL; 195ab4382d2SGreg Kroah-Hartman up->port.icount.rx++; 196ab4382d2SGreg Kroah-Hartman 197ab4382d2SGreg Kroah-Hartman if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 198ab4382d2SGreg Kroah-Hartman /* 199ab4382d2SGreg Kroah-Hartman * For statistics only 200ab4382d2SGreg Kroah-Hartman */ 201ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) { 202ab4382d2SGreg Kroah-Hartman lsr &= ~(UART_LSR_FE | UART_LSR_PE); 203ab4382d2SGreg Kroah-Hartman up->port.icount.brk++; 204ab4382d2SGreg Kroah-Hartman /* 205ab4382d2SGreg Kroah-Hartman * We do the SysRQ and SAK checking 206ab4382d2SGreg Kroah-Hartman * here because otherwise the break 207ab4382d2SGreg Kroah-Hartman * may get masked by ignore_status_mask 208ab4382d2SGreg Kroah-Hartman * or read_status_mask. 209ab4382d2SGreg Kroah-Hartman */ 210ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&up->port)) 211ab4382d2SGreg Kroah-Hartman goto ignore_char; 212ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_PE) { 213ab4382d2SGreg Kroah-Hartman up->port.icount.parity++; 214ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_FE) { 215ab4382d2SGreg Kroah-Hartman up->port.icount.frame++; 216ab4382d2SGreg Kroah-Hartman } 217ab4382d2SGreg Kroah-Hartman 218ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_OE) 219ab4382d2SGreg Kroah-Hartman up->port.icount.overrun++; 220ab4382d2SGreg Kroah-Hartman 221ab4382d2SGreg Kroah-Hartman /* 222ab4382d2SGreg Kroah-Hartman * Mask off conditions which should be ignored. 223ab4382d2SGreg Kroah-Hartman */ 224ab4382d2SGreg Kroah-Hartman lsr &= up->port.read_status_mask; 225ab4382d2SGreg Kroah-Hartman 226ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 227ab4382d2SGreg Kroah-Hartman if (up->port.line == up->port.cons->index) { 228ab4382d2SGreg Kroah-Hartman /* Recover the break flag from console xmit */ 229ab4382d2SGreg Kroah-Hartman lsr |= up->lsr_break_flag; 230ab4382d2SGreg Kroah-Hartman } 231ab4382d2SGreg Kroah-Hartman #endif 232ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) 233ab4382d2SGreg Kroah-Hartman flag = TTY_BREAK; 234ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_PE) 235ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 236ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_FE) 237ab4382d2SGreg Kroah-Hartman flag = TTY_FRAME; 238ab4382d2SGreg Kroah-Hartman } 239ab4382d2SGreg Kroah-Hartman 240ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&up->port, ch)) 241ab4382d2SGreg Kroah-Hartman goto ignore_char; 242ab4382d2SGreg Kroah-Hartman uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 243ab4382d2SGreg Kroah-Hartman ignore_char: 244ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 245ab4382d2SGreg Kroah-Hartman } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 246ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 247ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(tty); 248ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 249ab4382d2SGreg Kroah-Hartman } 250ab4382d2SGreg Kroah-Hartman 251ab4382d2SGreg Kroah-Hartman static void transmit_chars(struct uart_omap_port *up) 252ab4382d2SGreg Kroah-Hartman { 253ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 254ab4382d2SGreg Kroah-Hartman int count; 255ab4382d2SGreg Kroah-Hartman 256ab4382d2SGreg Kroah-Hartman if (up->port.x_char) { 257ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, up->port.x_char); 258ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 259ab4382d2SGreg Kroah-Hartman up->port.x_char = 0; 260ab4382d2SGreg Kroah-Hartman return; 261ab4382d2SGreg Kroah-Hartman } 262ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 263ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 264ab4382d2SGreg Kroah-Hartman return; 265ab4382d2SGreg Kroah-Hartman } 266af681cadSGreg Kroah-Hartman count = up->port.fifosize / 4; 267ab4382d2SGreg Kroah-Hartman do { 268ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, xmit->buf[xmit->tail]); 269ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 270ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 271ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 272ab4382d2SGreg Kroah-Hartman break; 273ab4382d2SGreg Kroah-Hartman } while (--count > 0); 274ab4382d2SGreg Kroah-Hartman 275ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 276ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 277ab4382d2SGreg Kroah-Hartman 278ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 279ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 280ab4382d2SGreg Kroah-Hartman } 281ab4382d2SGreg Kroah-Hartman 282ab4382d2SGreg Kroah-Hartman static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 283ab4382d2SGreg Kroah-Hartman { 284ab4382d2SGreg Kroah-Hartman if (!(up->ier & UART_IER_THRI)) { 285ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_THRI; 286ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 287ab4382d2SGreg Kroah-Hartman } 288ab4382d2SGreg Kroah-Hartman } 289ab4382d2SGreg Kroah-Hartman 290ab4382d2SGreg Kroah-Hartman static void serial_omap_start_tx(struct uart_port *port) 291ab4382d2SGreg Kroah-Hartman { 292ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 293be4b0281SPaul Walmsley struct omap_uart_port_info *pdata = up->pdev->dev.platform_data; 294ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit; 295ab4382d2SGreg Kroah-Hartman unsigned int start; 296ab4382d2SGreg Kroah-Hartman int ret = 0; 297ab4382d2SGreg Kroah-Hartman 298ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 299fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 300ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 301be4b0281SPaul Walmsley if (pdata->set_noidle) 302be4b0281SPaul Walmsley pdata->set_noidle(up->pdev); 303fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 304fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 305ab4382d2SGreg Kroah-Hartman return; 306ab4382d2SGreg Kroah-Hartman } 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_used) 309ab4382d2SGreg Kroah-Hartman return; 310ab4382d2SGreg Kroah-Hartman 311ab4382d2SGreg Kroah-Hartman xmit = &up->port.state->xmit; 312ab4382d2SGreg Kroah-Hartman 313ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) { 314fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 315ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_tx, 316ab4382d2SGreg Kroah-Hartman "UART Tx DMA", 317ab4382d2SGreg Kroah-Hartman (void *)uart_tx_dma_callback, up, 318ab4382d2SGreg Kroah-Hartman &(up->uart_dma.tx_dma_channel)); 319ab4382d2SGreg Kroah-Hartman 320ab4382d2SGreg Kroah-Hartman if (ret < 0) { 321ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 322ab4382d2SGreg Kroah-Hartman return; 323ab4382d2SGreg Kroah-Hartman } 324ab4382d2SGreg Kroah-Hartman } 325ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 326ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = true; 327ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 328ab4382d2SGreg Kroah-Hartman 329ab4382d2SGreg Kroah-Hartman start = up->uart_dma.tx_buf_dma_phys + 330ab4382d2SGreg Kroah-Hartman (xmit->tail & (UART_XMIT_SIZE - 1)); 331ab4382d2SGreg Kroah-Hartman 332ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 333ab4382d2SGreg Kroah-Hartman /* 334ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 335ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 336ab4382d2SGreg Kroah-Hartman * transfers 337ab4382d2SGreg Kroah-Hartman */ 338ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 339ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 340ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 341ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + 342ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE) - start; 343ab4382d2SGreg Kroah-Hartman 344ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 345ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 346ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 347ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 348ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 349ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 350ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 351ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 352ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 353ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 354ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 355ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 356ab4382d2SGreg Kroah-Hartman } 357ab4382d2SGreg Kroah-Hartman 358ab4382d2SGreg Kroah-Hartman static unsigned int check_modem_status(struct uart_omap_port *up) 359ab4382d2SGreg Kroah-Hartman { 360ab4382d2SGreg Kroah-Hartman unsigned int status; 361ab4382d2SGreg Kroah-Hartman 362ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_MSR); 363ab4382d2SGreg Kroah-Hartman status |= up->msr_saved_flags; 364ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 365ab4382d2SGreg Kroah-Hartman if ((status & UART_MSR_ANY_DELTA) == 0) 366ab4382d2SGreg Kroah-Hartman return status; 367ab4382d2SGreg Kroah-Hartman 368ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 369ab4382d2SGreg Kroah-Hartman up->port.state != NULL) { 370ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_TERI) 371ab4382d2SGreg Kroah-Hartman up->port.icount.rng++; 372ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDSR) 373ab4382d2SGreg Kroah-Hartman up->port.icount.dsr++; 374ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDCD) 375ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change 376ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_DCD); 377ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCTS) 378ab4382d2SGreg Kroah-Hartman uart_handle_cts_change 379ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_CTS); 380ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&up->port.state->port.delta_msr_wait); 381ab4382d2SGreg Kroah-Hartman } 382ab4382d2SGreg Kroah-Hartman 383ab4382d2SGreg Kroah-Hartman return status; 384ab4382d2SGreg Kroah-Hartman } 385ab4382d2SGreg Kroah-Hartman 386ab4382d2SGreg Kroah-Hartman /** 387ab4382d2SGreg Kroah-Hartman * serial_omap_irq() - This handles the interrupt from one port 388ab4382d2SGreg Kroah-Hartman * @irq: uart port irq number 389ab4382d2SGreg Kroah-Hartman * @dev_id: uart port info 390ab4382d2SGreg Kroah-Hartman */ 391ab4382d2SGreg Kroah-Hartman static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) 392ab4382d2SGreg Kroah-Hartman { 393ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = dev_id; 394ab4382d2SGreg Kroah-Hartman unsigned int iir, lsr; 395ab4382d2SGreg Kroah-Hartman unsigned long flags; 396ab4382d2SGreg Kroah-Hartman 397fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 398ab4382d2SGreg Kroah-Hartman iir = serial_in(up, UART_IIR); 399fcdca757SGovindraj.R if (iir & UART_IIR_NO_INT) { 400fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 401fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 402ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 403fcdca757SGovindraj.R } 404ab4382d2SGreg Kroah-Hartman 405ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 406ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 407ab4382d2SGreg Kroah-Hartman if (iir & UART_IIR_RLSI) { 408ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 409ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_DR) 410ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 411ab4382d2SGreg Kroah-Hartman } else { 412ab4382d2SGreg Kroah-Hartman up->ier &= ~(UART_IER_RDI | UART_IER_RLSI); 413ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 414ab4382d2SGreg Kroah-Hartman if ((serial_omap_start_rxdma(up) != 0) && 415ab4382d2SGreg Kroah-Hartman (lsr & UART_LSR_DR)) 416ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 417ab4382d2SGreg Kroah-Hartman } 418ab4382d2SGreg Kroah-Hartman } 419ab4382d2SGreg Kroah-Hartman 420ab4382d2SGreg Kroah-Hartman check_modem_status(up); 421ab4382d2SGreg Kroah-Hartman if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) 422ab4382d2SGreg Kroah-Hartman transmit_chars(up); 423ab4382d2SGreg Kroah-Hartman 424ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 425fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 426fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 427fcdca757SGovindraj.R 428ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 429ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 430ab4382d2SGreg Kroah-Hartman } 431ab4382d2SGreg Kroah-Hartman 432ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_tx_empty(struct uart_port *port) 433ab4382d2SGreg Kroah-Hartman { 434ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 435ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 436ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 437ab4382d2SGreg Kroah-Hartman 438fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 439ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 440ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 441ab4382d2SGreg Kroah-Hartman ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 442ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 443fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 444ab4382d2SGreg Kroah-Hartman return ret; 445ab4382d2SGreg Kroah-Hartman } 446ab4382d2SGreg Kroah-Hartman 447ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_get_mctrl(struct uart_port *port) 448ab4382d2SGreg Kroah-Hartman { 449ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 450514f31d1SShubhrajyoti D unsigned int status; 451ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 452ab4382d2SGreg Kroah-Hartman 453fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 454ab4382d2SGreg Kroah-Hartman status = check_modem_status(up); 455fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 456fcdca757SGovindraj.R 457ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 458ab4382d2SGreg Kroah-Hartman 459ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCD) 460ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CAR; 461ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_RI) 462ab4382d2SGreg Kroah-Hartman ret |= TIOCM_RNG; 463ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DSR) 464ab4382d2SGreg Kroah-Hartman ret |= TIOCM_DSR; 465ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_CTS) 466ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CTS; 467ab4382d2SGreg Kroah-Hartman return ret; 468ab4382d2SGreg Kroah-Hartman } 469ab4382d2SGreg Kroah-Hartman 470ab4382d2SGreg Kroah-Hartman static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 471ab4382d2SGreg Kroah-Hartman { 472ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 473ab4382d2SGreg Kroah-Hartman unsigned char mcr = 0; 474ab4382d2SGreg Kroah-Hartman 475ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 476ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 477ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_RTS; 478ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_DTR) 479ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_DTR; 480ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT1) 481ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT1; 482ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT2) 483ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT2; 484ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_LOOP) 485ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_LOOP; 486ab4382d2SGreg Kroah-Hartman 487fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 488c538d20cSGovindraj.R up->mcr = serial_in(up, UART_MCR); 489c538d20cSGovindraj.R up->mcr |= mcr; 490c538d20cSGovindraj.R serial_out(up, UART_MCR, up->mcr); 491fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 492ab4382d2SGreg Kroah-Hartman } 493ab4382d2SGreg Kroah-Hartman 494ab4382d2SGreg Kroah-Hartman static void serial_omap_break_ctl(struct uart_port *port, int break_state) 495ab4382d2SGreg Kroah-Hartman { 496ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 497ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 498ab4382d2SGreg Kroah-Hartman 499ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 500fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 501ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 502ab4382d2SGreg Kroah-Hartman if (break_state == -1) 503ab4382d2SGreg Kroah-Hartman up->lcr |= UART_LCR_SBC; 504ab4382d2SGreg Kroah-Hartman else 505ab4382d2SGreg Kroah-Hartman up->lcr &= ~UART_LCR_SBC; 506ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 507ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 508fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 509ab4382d2SGreg Kroah-Hartman } 510ab4382d2SGreg Kroah-Hartman 511ab4382d2SGreg Kroah-Hartman static int serial_omap_startup(struct uart_port *port) 512ab4382d2SGreg Kroah-Hartman { 513ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 514ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 515ab4382d2SGreg Kroah-Hartman int retval; 516ab4382d2SGreg Kroah-Hartman 517ab4382d2SGreg Kroah-Hartman /* 518ab4382d2SGreg Kroah-Hartman * Allocate the IRQ 519ab4382d2SGreg Kroah-Hartman */ 520ab4382d2SGreg Kroah-Hartman retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 521ab4382d2SGreg Kroah-Hartman up->name, up); 522ab4382d2SGreg Kroah-Hartman if (retval) 523ab4382d2SGreg Kroah-Hartman return retval; 524ab4382d2SGreg Kroah-Hartman 525ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 526ab4382d2SGreg Kroah-Hartman 527fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 528ab4382d2SGreg Kroah-Hartman /* 529ab4382d2SGreg Kroah-Hartman * Clear the FIFO buffers and disable them. 530ab4382d2SGreg Kroah-Hartman * (they will be reenabled in set_termios()) 531ab4382d2SGreg Kroah-Hartman */ 532ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 533ab4382d2SGreg Kroah-Hartman /* For Hardware flow control */ 534ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, UART_MCR_RTS); 535ab4382d2SGreg Kroah-Hartman 536ab4382d2SGreg Kroah-Hartman /* 537ab4382d2SGreg Kroah-Hartman * Clear the interrupt registers. 538ab4382d2SGreg Kroah-Hartman */ 539ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_LSR); 540ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 541ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 542ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_IIR); 543ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_MSR); 544ab4382d2SGreg Kroah-Hartman 545ab4382d2SGreg Kroah-Hartman /* 546ab4382d2SGreg Kroah-Hartman * Now, initialize the UART 547ab4382d2SGreg Kroah-Hartman */ 548ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_WLEN8); 549ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 550ab4382d2SGreg Kroah-Hartman /* 551ab4382d2SGreg Kroah-Hartman * Most PC uarts need OUT2 raised to enable interrupts. 552ab4382d2SGreg Kroah-Hartman */ 553ab4382d2SGreg Kroah-Hartman up->port.mctrl |= TIOCM_OUT2; 554ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 555ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 556ab4382d2SGreg Kroah-Hartman 557ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 558ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 559ab4382d2SGreg Kroah-Hartman free_page((unsigned long)up->port.state->xmit.buf); 560ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = dma_alloc_coherent(NULL, 561ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, 562ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 563ab4382d2SGreg Kroah-Hartman 0); 564ab4382d2SGreg Kroah-Hartman init_timer(&(up->uart_dma.rx_timer)); 565a9e210e0SJon Hunter up->uart_dma.rx_timer.function = serial_omap_rxdma_poll; 566ba77433dSRajendra Nayak up->uart_dma.rx_timer.data = up->port.line; 567ab4382d2SGreg Kroah-Hartman /* Currently the buffer size is 4KB. Can increase it */ 568ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = dma_alloc_coherent(NULL, 569ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 570ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0); 571ab4382d2SGreg Kroah-Hartman } 572ab4382d2SGreg Kroah-Hartman /* 573ab4382d2SGreg Kroah-Hartman * Finally, enable interrupts. Note: Modem status interrupts 574ab4382d2SGreg Kroah-Hartman * are set via set_termios(), which will be occurring imminently 575ab4382d2SGreg Kroah-Hartman * anyway, so we don't enable them here. 576ab4382d2SGreg Kroah-Hartman */ 577ab4382d2SGreg Kroah-Hartman up->ier = UART_IER_RLSI | UART_IER_RDI; 578ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 579ab4382d2SGreg Kroah-Hartman 58078841462SJarkko Nikula /* Enable module level wake up */ 58178841462SJarkko Nikula serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); 58278841462SJarkko Nikula 583fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 584fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 585ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 586ab4382d2SGreg Kroah-Hartman return 0; 587ab4382d2SGreg Kroah-Hartman } 588ab4382d2SGreg Kroah-Hartman 589ab4382d2SGreg Kroah-Hartman static void serial_omap_shutdown(struct uart_port *port) 590ab4382d2SGreg Kroah-Hartman { 591ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 592ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 593ab4382d2SGreg Kroah-Hartman 594ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); 595fcdca757SGovindraj.R 596fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 597ab4382d2SGreg Kroah-Hartman /* 598ab4382d2SGreg Kroah-Hartman * Disable interrupts from this port 599ab4382d2SGreg Kroah-Hartman */ 600ab4382d2SGreg Kroah-Hartman up->ier = 0; 601ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 602ab4382d2SGreg Kroah-Hartman 603ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 604ab4382d2SGreg Kroah-Hartman up->port.mctrl &= ~TIOCM_OUT2; 605ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 606ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 607ab4382d2SGreg Kroah-Hartman 608ab4382d2SGreg Kroah-Hartman /* 609ab4382d2SGreg Kroah-Hartman * Disable break condition and FIFOs 610ab4382d2SGreg Kroah-Hartman */ 611ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 612ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 613ab4382d2SGreg Kroah-Hartman 614ab4382d2SGreg Kroah-Hartman /* 615ab4382d2SGreg Kroah-Hartman * Read data port to reset things, and then free the irq 616ab4382d2SGreg Kroah-Hartman */ 617ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 618ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 619ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 620ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 621ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, up->port.state->xmit.buf, 622ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys); 623ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = NULL; 624ab4382d2SGreg Kroah-Hartman serial_omap_stop_rx(port); 625ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 626ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, up->uart_dma.rx_buf, 627ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys); 628ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = NULL; 629ab4382d2SGreg Kroah-Hartman } 630fcdca757SGovindraj.R 631fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 632ab4382d2SGreg Kroah-Hartman free_irq(up->port.irq, up); 633ab4382d2SGreg Kroah-Hartman } 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman static inline void 636ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff 637ab4382d2SGreg Kroah-Hartman (struct uart_omap_port *up, struct ktermios *termios) 638ab4382d2SGreg Kroah-Hartman { 639ab4382d2SGreg Kroah-Hartman up->lcr = serial_in(up, UART_LCR); 640ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 641ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 642ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); 643ab4382d2SGreg Kroah-Hartman 644ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XON1, termios->c_cc[VSTART]); 645ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 646ab4382d2SGreg Kroah-Hartman 647ab4382d2SGreg Kroah-Hartman /* clear SW control mode bits */ 648c538d20cSGovindraj.R up->efr &= OMAP_UART_SW_CLR; 649ab4382d2SGreg Kroah-Hartman 650ab4382d2SGreg Kroah-Hartman /* 651ab4382d2SGreg Kroah-Hartman * IXON Flag: 652ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 653ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 654ab4382d2SGreg Kroah-Hartman */ 655ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 656c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_TX; 657ab4382d2SGreg Kroah-Hartman 658ab4382d2SGreg Kroah-Hartman /* 659ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 660ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 661ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 662ab4382d2SGreg Kroah-Hartman */ 663ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 664c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_RX; 665ab4382d2SGreg Kroah-Hartman 666ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 667ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 668ab4382d2SGreg Kroah-Hartman 669ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 670ab4382d2SGreg Kroah-Hartman 671ab4382d2SGreg Kroah-Hartman /* 672ab4382d2SGreg Kroah-Hartman * IXANY Flag: 673ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 674ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 675ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 676ab4382d2SGreg Kroah-Hartman */ 677ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 678ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 679ab4382d2SGreg Kroah-Hartman 680ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 681ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 682ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 683ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 684ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 685ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 686ab4382d2SGreg Kroah-Hartman */ 687c538d20cSGovindraj.R serial_out(up, UART_EFR, up->efr | UART_EFR_SCD); 688ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 689ab4382d2SGreg Kroah-Hartman 690ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 691ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 692ab4382d2SGreg Kroah-Hartman } 693ab4382d2SGreg Kroah-Hartman 6942fd14964SGovindraj.R static void serial_omap_uart_qos_work(struct work_struct *work) 6952fd14964SGovindraj.R { 6962fd14964SGovindraj.R struct uart_omap_port *up = container_of(work, struct uart_omap_port, 6972fd14964SGovindraj.R qos_work); 6982fd14964SGovindraj.R 6992fd14964SGovindraj.R pm_qos_update_request(&up->pm_qos_request, up->latency); 7002fd14964SGovindraj.R } 7012fd14964SGovindraj.R 702ab4382d2SGreg Kroah-Hartman static void 703ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 704ab4382d2SGreg Kroah-Hartman struct ktermios *old) 705ab4382d2SGreg Kroah-Hartman { 706ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 707ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 708ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 709ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 710ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 711ab4382d2SGreg Kroah-Hartman 712ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 713ab4382d2SGreg Kroah-Hartman case CS5: 714ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 715ab4382d2SGreg Kroah-Hartman break; 716ab4382d2SGreg Kroah-Hartman case CS6: 717ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 718ab4382d2SGreg Kroah-Hartman break; 719ab4382d2SGreg Kroah-Hartman case CS7: 720ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 721ab4382d2SGreg Kroah-Hartman break; 722ab4382d2SGreg Kroah-Hartman default: 723ab4382d2SGreg Kroah-Hartman case CS8: 724ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 725ab4382d2SGreg Kroah-Hartman break; 726ab4382d2SGreg Kroah-Hartman } 727ab4382d2SGreg Kroah-Hartman 728ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 729ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 730ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 731ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 732ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 733ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 734ab4382d2SGreg Kroah-Hartman 735ab4382d2SGreg Kroah-Hartman /* 736ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 737ab4382d2SGreg Kroah-Hartman */ 738ab4382d2SGreg Kroah-Hartman 739ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 740ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 741ab4382d2SGreg Kroah-Hartman 7422fd14964SGovindraj.R /* calculate wakeup latency constraint */ 7432fd14964SGovindraj.R up->calc_latency = (1000000 * up->port.fifosize) / 7442fd14964SGovindraj.R (1000 * baud / 8); 7452fd14964SGovindraj.R up->latency = up->calc_latency; 7462fd14964SGovindraj.R schedule_work(&up->qos_work); 7472fd14964SGovindraj.R 748c538d20cSGovindraj.R up->dll = quot & 0xff; 749c538d20cSGovindraj.R up->dlh = quot >> 8; 750c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_DISABLE; 751c538d20cSGovindraj.R 752ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 753ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 754ab4382d2SGreg Kroah-Hartman if (up->use_dma) 755ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 756ab4382d2SGreg Kroah-Hartman 757ab4382d2SGreg Kroah-Hartman /* 758ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 759ab4382d2SGreg Kroah-Hartman * interrupts disabled. 760ab4382d2SGreg Kroah-Hartman */ 761fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 762ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 763ab4382d2SGreg Kroah-Hartman 764ab4382d2SGreg Kroah-Hartman /* 765ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 766ab4382d2SGreg Kroah-Hartman */ 767ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 768ab4382d2SGreg Kroah-Hartman 769ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 770ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 771ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 772ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 773ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 774ab4382d2SGreg Kroah-Hartman 775ab4382d2SGreg Kroah-Hartman /* 776ab4382d2SGreg Kroah-Hartman * Characters to ignore 777ab4382d2SGreg Kroah-Hartman */ 778ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 779ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 780ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 781ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 782ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 783ab4382d2SGreg Kroah-Hartman /* 784ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 785ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 786ab4382d2SGreg Kroah-Hartman */ 787ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 788ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 789ab4382d2SGreg Kroah-Hartman } 790ab4382d2SGreg Kroah-Hartman 791ab4382d2SGreg Kroah-Hartman /* 792ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 793ab4382d2SGreg Kroah-Hartman */ 794ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 795ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 796ab4382d2SGreg Kroah-Hartman 797ab4382d2SGreg Kroah-Hartman /* 798ab4382d2SGreg Kroah-Hartman * Modem status interrupts 799ab4382d2SGreg Kroah-Hartman */ 800ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 801ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 802ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 803ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 804ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 805c538d20cSGovindraj.R up->lcr = cval; 80632212897SGovindraj.R up->scr = OMAP_UART_SCR_TX_EMPTY; 807ab4382d2SGreg Kroah-Hartman 808ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 809ab4382d2SGreg Kroah-Hartman 810ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 811ab4382d2SGreg Kroah-Hartman * baud clock is not running 812ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 813ab4382d2SGreg Kroah-Hartman */ 814ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 815ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 816ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 817ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 818ab4382d2SGreg Kroah-Hartman 819ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 820ab4382d2SGreg Kroah-Hartman 821ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 822ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 823ab4382d2SGreg Kroah-Hartman 824ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 825ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 826ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 827ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 8280ba5f668SPaul Walmsley 8290ba5f668SPaul Walmsley up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 8300a697b22SPaul Walmsley 8318a74e9ffSGreg Kroah-Hartman if (up->use_dma) { 8328a74e9ffSGreg Kroah-Hartman serial_out(up, UART_TI752_TLR, 0); 8330ba5f668SPaul Walmsley up->scr |= UART_FCR_TRIGGER_4; 8340ba5f668SPaul Walmsley } else { 8350ba5f668SPaul Walmsley /* Set receive FIFO threshold to 1 byte */ 8360ba5f668SPaul Walmsley up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 8370ba5f668SPaul Walmsley up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT); 8388a74e9ffSGreg Kroah-Hartman } 8398a74e9ffSGreg Kroah-Hartman 8400ba5f668SPaul Walmsley serial_out(up, UART_FCR, up->fcr); 8410ba5f668SPaul Walmsley serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 8420ba5f668SPaul Walmsley 843c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 844c538d20cSGovindraj.R 845ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 846ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 847ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 848ab4382d2SGreg Kroah-Hartman 849ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 850ab4382d2SGreg Kroah-Hartman 85194734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 85294734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 85394734749SGovindraj.R else 854c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 85594734749SGovindraj.R 856ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 857ab4382d2SGreg Kroah-Hartman 858ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 859ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 860ab4382d2SGreg Kroah-Hartman 861ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 862ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 863ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 864ab4382d2SGreg Kroah-Hartman 865c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 866c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 867ab4382d2SGreg Kroah-Hartman 868ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 869ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 870ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 871ab4382d2SGreg Kroah-Hartman 872ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 873ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 874ab4382d2SGreg Kroah-Hartman 875ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 876c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_13X_MODE; 877ab4382d2SGreg Kroah-Hartman else 878c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_16X_MODE; 879c538d20cSGovindraj.R 88094734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 88194734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 88294734749SGovindraj.R else 883c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 884ab4382d2SGreg Kroah-Hartman 885ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 886ab4382d2SGreg Kroah-Hartman 887ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 888ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 889ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 890ab4382d2SGreg Kroah-Hartman 891ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 892ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 893ab4382d2SGreg Kroah-Hartman 894ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 895ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 896ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 897ab4382d2SGreg Kroah-Hartman 898ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 899ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 900ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 901ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 902ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 903ab4382d2SGreg Kroah-Hartman } 904ab4382d2SGreg Kroah-Hartman 905ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 906ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 907ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 908ab4382d2SGreg Kroah-Hartman 909ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 910fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 911ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 912ab4382d2SGreg Kroah-Hartman } 913ab4382d2SGreg Kroah-Hartman 914ab4382d2SGreg Kroah-Hartman static void 915ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 916ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 917ab4382d2SGreg Kroah-Hartman { 918ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 919ab4382d2SGreg Kroah-Hartman unsigned char efr; 920ab4382d2SGreg Kroah-Hartman 921ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 922fcdca757SGovindraj.R 923fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 924ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 925ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 926ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 927ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 928ab4382d2SGreg Kroah-Hartman 929ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 930ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 931ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 932ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 933fcdca757SGovindraj.R 934fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 935fcdca757SGovindraj.R if (!state) 936fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 937fcdca757SGovindraj.R else 938fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 939fcdca757SGovindraj.R } 940fcdca757SGovindraj.R 941fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 942ab4382d2SGreg Kroah-Hartman } 943ab4382d2SGreg Kroah-Hartman 944ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 945ab4382d2SGreg Kroah-Hartman { 946ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 947ab4382d2SGreg Kroah-Hartman } 948ab4382d2SGreg Kroah-Hartman 949ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 950ab4382d2SGreg Kroah-Hartman { 951ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 952ab4382d2SGreg Kroah-Hartman return 0; 953ab4382d2SGreg Kroah-Hartman } 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 956ab4382d2SGreg Kroah-Hartman { 957ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 958ab4382d2SGreg Kroah-Hartman 959ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 960ba77433dSRajendra Nayak up->port.line); 961ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 962ab4382d2SGreg Kroah-Hartman } 963ab4382d2SGreg Kroah-Hartman 964ab4382d2SGreg Kroah-Hartman static int 965ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 966ab4382d2SGreg Kroah-Hartman { 967ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 968ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 969ab4382d2SGreg Kroah-Hartman return -EINVAL; 970ab4382d2SGreg Kroah-Hartman } 971ab4382d2SGreg Kroah-Hartman 972ab4382d2SGreg Kroah-Hartman static const char * 973ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 974ab4382d2SGreg Kroah-Hartman { 975ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 976ab4382d2SGreg Kroah-Hartman 977ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 978ab4382d2SGreg Kroah-Hartman return up->name; 979ab4382d2SGreg Kroah-Hartman } 980ab4382d2SGreg Kroah-Hartman 981ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 982ab4382d2SGreg Kroah-Hartman 983ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 984ab4382d2SGreg Kroah-Hartman { 985ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 988ab4382d2SGreg Kroah-Hartman do { 989ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 990ab4382d2SGreg Kroah-Hartman 991ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 992ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 995ab4382d2SGreg Kroah-Hartman break; 996ab4382d2SGreg Kroah-Hartman udelay(1); 997ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 998ab4382d2SGreg Kroah-Hartman 999ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 1000ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 1001ab4382d2SGreg Kroah-Hartman tmout = 1000000; 1002ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 1003ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 1004ab4382d2SGreg Kroah-Hartman 1005ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1006ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 1007ab4382d2SGreg Kroah-Hartman break; 1008ab4382d2SGreg Kroah-Hartman 1009ab4382d2SGreg Kroah-Hartman udelay(1); 1010ab4382d2SGreg Kroah-Hartman } 1011ab4382d2SGreg Kroah-Hartman } 1012ab4382d2SGreg Kroah-Hartman } 1013ab4382d2SGreg Kroah-Hartman 1014ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1015ab4382d2SGreg Kroah-Hartman 1016ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1017ab4382d2SGreg Kroah-Hartman { 1018ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1019fcdca757SGovindraj.R 1020fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1021ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1022ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1023fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 1024ab4382d2SGreg Kroah-Hartman } 1025ab4382d2SGreg Kroah-Hartman 1026ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 1027ab4382d2SGreg Kroah-Hartman { 1028ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1029fcdca757SGovindraj.R unsigned int status; 1030ab4382d2SGreg Kroah-Hartman 1031fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1032fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 1033ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 1034ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 1035ab4382d2SGreg Kroah-Hartman 1036fcdca757SGovindraj.R status = serial_in(up, UART_RX); 1037fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 1038fcdca757SGovindraj.R return status; 1039ab4382d2SGreg Kroah-Hartman } 1040ab4382d2SGreg Kroah-Hartman 1041ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1044ab4382d2SGreg Kroah-Hartman 1045ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 1046ab4382d2SGreg Kroah-Hartman 1047ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 1048ab4382d2SGreg Kroah-Hartman 1049ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 1050ab4382d2SGreg Kroah-Hartman { 1051ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1052ab4382d2SGreg Kroah-Hartman 1053ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1054ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1055ab4382d2SGreg Kroah-Hartman } 1056ab4382d2SGreg Kroah-Hartman 1057ab4382d2SGreg Kroah-Hartman static void 1058ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1059ab4382d2SGreg Kroah-Hartman unsigned int count) 1060ab4382d2SGreg Kroah-Hartman { 1061ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1062ab4382d2SGreg Kroah-Hartman unsigned long flags; 1063ab4382d2SGreg Kroah-Hartman unsigned int ier; 1064ab4382d2SGreg Kroah-Hartman int locked = 1; 1065ab4382d2SGreg Kroah-Hartman 1066fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1067fcdca757SGovindraj.R 1068ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1069ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1070ab4382d2SGreg Kroah-Hartman locked = 0; 1071ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1072ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1073ab4382d2SGreg Kroah-Hartman else 1074ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1075ab4382d2SGreg Kroah-Hartman 1076ab4382d2SGreg Kroah-Hartman /* 1077ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1078ab4382d2SGreg Kroah-Hartman */ 1079ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1080ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1083ab4382d2SGreg Kroah-Hartman 1084ab4382d2SGreg Kroah-Hartman /* 1085ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1086ab4382d2SGreg Kroah-Hartman * and restore the IER 1087ab4382d2SGreg Kroah-Hartman */ 1088ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1089ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1090ab4382d2SGreg Kroah-Hartman /* 1091ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1092ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1093ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1094ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1095ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1096ab4382d2SGreg Kroah-Hartman */ 1097ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1098ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1099ab4382d2SGreg Kroah-Hartman 1100fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1101fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1102ab4382d2SGreg Kroah-Hartman if (locked) 1103ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1104ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1105ab4382d2SGreg Kroah-Hartman } 1106ab4382d2SGreg Kroah-Hartman 1107ab4382d2SGreg Kroah-Hartman static int __init 1108ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1109ab4382d2SGreg Kroah-Hartman { 1110ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1111ab4382d2SGreg Kroah-Hartman int baud = 115200; 1112ab4382d2SGreg Kroah-Hartman int bits = 8; 1113ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1114ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1115ab4382d2SGreg Kroah-Hartman 1116ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1117ab4382d2SGreg Kroah-Hartman return -ENODEV; 1118ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1119ab4382d2SGreg Kroah-Hartman 1120ab4382d2SGreg Kroah-Hartman if (options) 1121ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1124ab4382d2SGreg Kroah-Hartman } 1125ab4382d2SGreg Kroah-Hartman 1126ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1127ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1128ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1129ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1130ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1131ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1132ab4382d2SGreg Kroah-Hartman .index = -1, 1133ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1134ab4382d2SGreg Kroah-Hartman }; 1135ab4382d2SGreg Kroah-Hartman 1136ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1137ab4382d2SGreg Kroah-Hartman { 1138ba77433dSRajendra Nayak serial_omap_console_ports[up->port.line] = up; 1139ab4382d2SGreg Kroah-Hartman } 1140ab4382d2SGreg Kroah-Hartman 1141ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1142ab4382d2SGreg Kroah-Hartman 1143ab4382d2SGreg Kroah-Hartman #else 1144ab4382d2SGreg Kroah-Hartman 1145ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1146ab4382d2SGreg Kroah-Hartman 1147ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1148ab4382d2SGreg Kroah-Hartman {} 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman #endif 1151ab4382d2SGreg Kroah-Hartman 1152ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1153ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1154ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1155ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1156ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1157ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1158ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1159ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1160ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1161ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1162ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1163ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1164ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1165ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1166ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1167ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1168ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1169ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1170ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1171ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1172ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1173ab4382d2SGreg Kroah-Hartman #endif 1174ab4382d2SGreg Kroah-Hartman }; 1175ab4382d2SGreg Kroah-Hartman 1176ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1177ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1178ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1179ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1180ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1181ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1182ab4382d2SGreg Kroah-Hartman }; 1183ab4382d2SGreg Kroah-Hartman 11843bc4f0d8SShubhrajyoti D #ifdef CONFIG_PM_SLEEP 1185fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1186ab4382d2SGreg Kroah-Hartman { 1187fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1188ab4382d2SGreg Kroah-Hartman 11892fd14964SGovindraj.R if (up) { 1190ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 11912fd14964SGovindraj.R flush_work_sync(&up->qos_work); 11922fd14964SGovindraj.R } 11932fd14964SGovindraj.R 1194ab4382d2SGreg Kroah-Hartman return 0; 1195ab4382d2SGreg Kroah-Hartman } 1196ab4382d2SGreg Kroah-Hartman 1197fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1198ab4382d2SGreg Kroah-Hartman { 1199fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1200ab4382d2SGreg Kroah-Hartman 1201ab4382d2SGreg Kroah-Hartman if (up) 1202ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1203ab4382d2SGreg Kroah-Hartman return 0; 1204ab4382d2SGreg Kroah-Hartman } 1205fcdca757SGovindraj.R #endif 1206ab4382d2SGreg Kroah-Hartman 1207a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no) 1208ab4382d2SGreg Kroah-Hartman { 1209ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1210ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1211ab4382d2SGreg Kroah-Hartman int ret = 0; 1212ab4382d2SGreg Kroah-Hartman 1213ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1214ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1215ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1216ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1217a9e210e0SJon Hunter up->uart_dma.rx_timeout) { 1218ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1219a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1220ab4382d2SGreg Kroah-Hartman } else { 1221ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1222ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1223ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1224ab4382d2SGreg Kroah-Hartman } 1225ab4382d2SGreg Kroah-Hartman return; 1226ab4382d2SGreg Kroah-Hartman } 1227ab4382d2SGreg Kroah-Hartman 1228ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1229ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1230ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1231ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1232ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1233ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1234ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1235ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1236ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1237ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1238ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1239ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1240ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1241ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1242ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1243ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1244ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1245ab4382d2SGreg Kroah-Hartman } 1246ab4382d2SGreg Kroah-Hartman } else { 1247ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1248a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1249ab4382d2SGreg Kroah-Hartman } 1250ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1251ab4382d2SGreg Kroah-Hartman } 1252ab4382d2SGreg Kroah-Hartman 1253ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1254ab4382d2SGreg Kroah-Hartman { 1255ab4382d2SGreg Kroah-Hartman return; 1256ab4382d2SGreg Kroah-Hartman } 1257ab4382d2SGreg Kroah-Hartman 1258ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1259ab4382d2SGreg Kroah-Hartman { 1260ab4382d2SGreg Kroah-Hartman int ret = 0; 1261ab4382d2SGreg Kroah-Hartman 1262ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1263fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1264ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1265ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1266ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1267ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1268ab4382d2SGreg Kroah-Hartman if (ret < 0) 1269ab4382d2SGreg Kroah-Hartman return ret; 1270ab4382d2SGreg Kroah-Hartman 1271ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1272ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1273ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1274ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1275ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1276ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1277ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1278ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1279ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1280ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1281ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1282ab4382d2SGreg Kroah-Hartman } 1283ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1284ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1285ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1286ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1287a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1288ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1289ab4382d2SGreg Kroah-Hartman return ret; 1290ab4382d2SGreg Kroah-Hartman } 1291ab4382d2SGreg Kroah-Hartman 1292ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1293ab4382d2SGreg Kroah-Hartman { 1294ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1295ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1296ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1297ab4382d2SGreg Kroah-Hartman 1298ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1299ab4382d2SGreg Kroah-Hartman return; 1300ab4382d2SGreg Kroah-Hartman 1301ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1302ab4382d2SGreg Kroah-Hartman /* 1303ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1304ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1305ab4382d2SGreg Kroah-Hartman * transfers 1306ab4382d2SGreg Kroah-Hartman */ 1307ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1308ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1309ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1310ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1311ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1312ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1313ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1314ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1315ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1316ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1317ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1318ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1319ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1320ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1321ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1322ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1323ab4382d2SGreg Kroah-Hartman } 1324ab4382d2SGreg Kroah-Hartman 1325ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1326ab4382d2SGreg Kroah-Hartman { 1327ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1328ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1329ab4382d2SGreg Kroah-Hartman 1330ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1331ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1332ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1333ab4382d2SGreg Kroah-Hartman 1334ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1335ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1336ab4382d2SGreg Kroah-Hartman 1337ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1338ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1339ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1340ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1341ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1342ab4382d2SGreg Kroah-Hartman } else { 1343ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1344ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1345ab4382d2SGreg Kroah-Hartman } 1346ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1347ab4382d2SGreg Kroah-Hartman return; 1348ab4382d2SGreg Kroah-Hartman } 1349ab4382d2SGreg Kroah-Hartman 1350d92b0dfcSRajendra Nayak static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) 1351d92b0dfcSRajendra Nayak { 1352d92b0dfcSRajendra Nayak struct omap_uart_port_info *omap_up_info; 1353d92b0dfcSRajendra Nayak 1354d92b0dfcSRajendra Nayak omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); 1355d92b0dfcSRajendra Nayak if (!omap_up_info) 1356d92b0dfcSRajendra Nayak return NULL; /* out of memory */ 1357d92b0dfcSRajendra Nayak 1358d92b0dfcSRajendra Nayak of_property_read_u32(dev->of_node, "clock-frequency", 1359d92b0dfcSRajendra Nayak &omap_up_info->uartclk); 1360d92b0dfcSRajendra Nayak return omap_up_info; 1361d92b0dfcSRajendra Nayak } 1362d92b0dfcSRajendra Nayak 1363ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1364ab4382d2SGreg Kroah-Hartman { 1365ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1366ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1367ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1368ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1369ab4382d2SGreg Kroah-Hartman 1370d92b0dfcSRajendra Nayak if (pdev->dev.of_node) 1371d92b0dfcSRajendra Nayak omap_up_info = of_get_uart_port_info(&pdev->dev); 1372d92b0dfcSRajendra Nayak 1373ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1374ab4382d2SGreg Kroah-Hartman if (!mem) { 1375ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1376ab4382d2SGreg Kroah-Hartman return -ENODEV; 1377ab4382d2SGreg Kroah-Hartman } 1378ab4382d2SGreg Kroah-Hartman 1379ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1380ab4382d2SGreg Kroah-Hartman if (!irq) { 1381ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1382ab4382d2SGreg Kroah-Hartman return -ENODEV; 1383ab4382d2SGreg Kroah-Hartman } 1384ab4382d2SGreg Kroah-Hartman 138528f65c11SJoe Perches if (!request_mem_region(mem->start, resource_size(mem), 1386ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1387ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1388ab4382d2SGreg Kroah-Hartman return -EBUSY; 1389ab4382d2SGreg Kroah-Hartman } 1390ab4382d2SGreg Kroah-Hartman 1391ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1392ab4382d2SGreg Kroah-Hartman if (!dma_rx) { 1393ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1394ab4382d2SGreg Kroah-Hartman goto err; 1395ab4382d2SGreg Kroah-Hartman } 1396ab4382d2SGreg Kroah-Hartman 1397ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1398ab4382d2SGreg Kroah-Hartman if (!dma_tx) { 1399ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1400ab4382d2SGreg Kroah-Hartman goto err; 1401ab4382d2SGreg Kroah-Hartman } 1402ab4382d2SGreg Kroah-Hartman 1403ab4382d2SGreg Kroah-Hartman up = kzalloc(sizeof(*up), GFP_KERNEL); 1404ab4382d2SGreg Kroah-Hartman if (up == NULL) { 1405ab4382d2SGreg Kroah-Hartman ret = -ENOMEM; 1406ab4382d2SGreg Kroah-Hartman goto do_release_region; 1407ab4382d2SGreg Kroah-Hartman } 1408ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1409ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1410ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1411ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1412ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1413ab4382d2SGreg Kroah-Hartman 1414ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1415ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1416ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1417ab4382d2SGreg Kroah-Hartman 1418d92b0dfcSRajendra Nayak if (pdev->dev.of_node) 1419d92b0dfcSRajendra Nayak up->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); 1420d92b0dfcSRajendra Nayak else 1421ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1422ab4382d2SGreg Kroah-Hartman 1423d92b0dfcSRajendra Nayak if (up->port.line < 0) { 1424d92b0dfcSRajendra Nayak dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", 1425d92b0dfcSRajendra Nayak up->port.line); 1426d92b0dfcSRajendra Nayak ret = -ENODEV; 1427d92b0dfcSRajendra Nayak goto err; 1428d92b0dfcSRajendra Nayak } 1429d92b0dfcSRajendra Nayak 1430d92b0dfcSRajendra Nayak sprintf(up->name, "OMAP UART%d", up->port.line); 1431edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1432edd70ad7SGovindraj.R up->port.membase = ioremap(mem->start, resource_size(mem)); 1433edd70ad7SGovindraj.R if (!up->port.membase) { 1434edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1435edd70ad7SGovindraj.R ret = -ENOMEM; 1436edd70ad7SGovindraj.R goto err; 1437edd70ad7SGovindraj.R } 1438edd70ad7SGovindraj.R 1439ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1440ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 14418fe789dcSRajendra Nayak if (!up->port.uartclk) { 14428fe789dcSRajendra Nayak up->port.uartclk = DEFAULT_CLK_SPEED; 14438fe789dcSRajendra Nayak dev_warn(&pdev->dev, "No clock speed specified: using default:" 14448fe789dcSRajendra Nayak "%d\n", DEFAULT_CLK_SPEED); 14458fe789dcSRajendra Nayak } 1446ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 144794734749SGovindraj.R up->errata = omap_up_info->errata; 1448ab4382d2SGreg Kroah-Hartman 1449ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1450ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1451ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1452ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1453c86845dbSDeepak K up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size; 1454c86845dbSDeepak K up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout; 1455a9e210e0SJon Hunter up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate; 1456ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1457ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1458ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1459ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1460ab4382d2SGreg Kroah-Hartman } 1461ab4382d2SGreg Kroah-Hartman 14622fd14964SGovindraj.R up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 14632fd14964SGovindraj.R up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 14642fd14964SGovindraj.R pm_qos_add_request(&up->pm_qos_request, 14652fd14964SGovindraj.R PM_QOS_CPU_DMA_LATENCY, up->latency); 14662fd14964SGovindraj.R serial_omap_uart_wq = create_singlethread_workqueue(up->name); 14672fd14964SGovindraj.R INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 14682fd14964SGovindraj.R 1469fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1470fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1471c86845dbSDeepak K omap_up_info->autosuspend_timeout); 1472fcdca757SGovindraj.R 1473fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1474fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1475fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1476fcdca757SGovindraj.R 1477ba77433dSRajendra Nayak ui[up->port.line] = up; 1478ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1479ab4382d2SGreg Kroah-Hartman 1480ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1481ab4382d2SGreg Kroah-Hartman if (ret != 0) 1482ab4382d2SGreg Kroah-Hartman goto do_release_region; 1483ab4382d2SGreg Kroah-Hartman 1484fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1485ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1486ab4382d2SGreg Kroah-Hartman return 0; 1487ab4382d2SGreg Kroah-Hartman err: 1488ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1489ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1490ab4382d2SGreg Kroah-Hartman do_release_region: 149128f65c11SJoe Perches release_mem_region(mem->start, resource_size(mem)); 1492ab4382d2SGreg Kroah-Hartman return ret; 1493ab4382d2SGreg Kroah-Hartman } 1494ab4382d2SGreg Kroah-Hartman 1495ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1496ab4382d2SGreg Kroah-Hartman { 1497ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1498ab4382d2SGreg Kroah-Hartman 1499ab4382d2SGreg Kroah-Hartman if (up) { 1500fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1501ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 15022fd14964SGovindraj.R pm_qos_remove_request(&up->pm_qos_request); 15032fd14964SGovindraj.R 1504ab4382d2SGreg Kroah-Hartman kfree(up); 1505ab4382d2SGreg Kroah-Hartman } 1506fcdca757SGovindraj.R 1507fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1508ab4382d2SGreg Kroah-Hartman return 0; 1509ab4382d2SGreg Kroah-Hartman } 1510ab4382d2SGreg Kroah-Hartman 151194734749SGovindraj.R /* 151294734749SGovindraj.R * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 151394734749SGovindraj.R * The access to uart register after MDR1 Access 151494734749SGovindraj.R * causes UART to corrupt data. 151594734749SGovindraj.R * 151694734749SGovindraj.R * Need a delay = 151794734749SGovindraj.R * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 151894734749SGovindraj.R * give 10 times as much 151994734749SGovindraj.R */ 152094734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 152194734749SGovindraj.R { 152294734749SGovindraj.R u8 timeout = 255; 152394734749SGovindraj.R 152494734749SGovindraj.R serial_out(up, UART_OMAP_MDR1, mdr1); 152594734749SGovindraj.R udelay(2); 152694734749SGovindraj.R serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 152794734749SGovindraj.R UART_FCR_CLEAR_RCVR); 152894734749SGovindraj.R /* 152994734749SGovindraj.R * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 153094734749SGovindraj.R * TX_FIFO_E bit is 1. 153194734749SGovindraj.R */ 153294734749SGovindraj.R while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 153394734749SGovindraj.R (UART_LSR_THRE | UART_LSR_DR))) { 153494734749SGovindraj.R timeout--; 153594734749SGovindraj.R if (!timeout) { 153694734749SGovindraj.R /* Should *never* happen. we warn and carry on */ 153794734749SGovindraj.R dev_crit(&up->pdev->dev, "Errata i202: timedout %x\n", 153894734749SGovindraj.R serial_in(up, UART_LSR)); 153994734749SGovindraj.R break; 154094734749SGovindraj.R } 154194734749SGovindraj.R udelay(1); 154294734749SGovindraj.R } 154394734749SGovindraj.R } 154494734749SGovindraj.R 1545b5148856SShubhrajyoti D #ifdef CONFIG_PM_RUNTIME 15469f9ac1e8SGovindraj.R static void serial_omap_restore_context(struct uart_omap_port *up) 15479f9ac1e8SGovindraj.R { 154894734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 154994734749SGovindraj.R serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 155094734749SGovindraj.R else 15519f9ac1e8SGovindraj.R serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 155294734749SGovindraj.R 15539f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 15549f9ac1e8SGovindraj.R serial_out(up, UART_EFR, UART_EFR_ECB); 15559f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 15569f9ac1e8SGovindraj.R serial_out(up, UART_IER, 0x0); 15579f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1558c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); 1559c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); 15609f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 15619f9ac1e8SGovindraj.R serial_out(up, UART_IER, up->ier); 15629f9ac1e8SGovindraj.R serial_out(up, UART_FCR, up->fcr); 15639f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 15649f9ac1e8SGovindraj.R serial_out(up, UART_MCR, up->mcr); 15659f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1566c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 15679f9ac1e8SGovindraj.R serial_out(up, UART_EFR, up->efr); 15689f9ac1e8SGovindraj.R serial_out(up, UART_LCR, up->lcr); 156994734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 157094734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 157194734749SGovindraj.R else 1572c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 15739f9ac1e8SGovindraj.R } 15749f9ac1e8SGovindraj.R 1575fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1576fcdca757SGovindraj.R { 1577ec3bebc6SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1578ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 1579ec3bebc6SGovindraj.R 1580ec3bebc6SGovindraj.R if (!up) 1581ec3bebc6SGovindraj.R return -EINVAL; 1582ec3bebc6SGovindraj.R 1583d92b0dfcSRajendra Nayak if (!pdata || !pdata->enable_wakeup) 158462f3ec5fSGovindraj.R return 0; 158562f3ec5fSGovindraj.R 1586ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) 1587ec3bebc6SGovindraj.R up->context_loss_cnt = pdata->get_context_loss_count(dev); 1588ec3bebc6SGovindraj.R 158962f3ec5fSGovindraj.R if (device_may_wakeup(dev)) { 159062f3ec5fSGovindraj.R if (!up->wakeups_enabled) { 159162f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, true); 159262f3ec5fSGovindraj.R up->wakeups_enabled = true; 159362f3ec5fSGovindraj.R } 159462f3ec5fSGovindraj.R } else { 159562f3ec5fSGovindraj.R if (up->wakeups_enabled) { 159662f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, false); 159762f3ec5fSGovindraj.R up->wakeups_enabled = false; 159862f3ec5fSGovindraj.R } 159962f3ec5fSGovindraj.R } 160062f3ec5fSGovindraj.R 160194734749SGovindraj.R /* Errata i291 */ 160294734749SGovindraj.R if (up->use_dma && pdata->set_forceidle && 160394734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 160494734749SGovindraj.R pdata->set_forceidle(up->pdev); 160594734749SGovindraj.R 16062fd14964SGovindraj.R up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 16072fd14964SGovindraj.R schedule_work(&up->qos_work); 16082fd14964SGovindraj.R 1609fcdca757SGovindraj.R return 0; 1610fcdca757SGovindraj.R } 1611fcdca757SGovindraj.R 1612fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1613fcdca757SGovindraj.R { 16149f9ac1e8SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1615ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 16169f9ac1e8SGovindraj.R 1617ec3bebc6SGovindraj.R if (up) { 1618ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) { 1619ec3bebc6SGovindraj.R u32 loss_cnt = pdata->get_context_loss_count(dev); 1620ec3bebc6SGovindraj.R 1621ec3bebc6SGovindraj.R if (up->context_loss_cnt != loss_cnt) 16229f9ac1e8SGovindraj.R serial_omap_restore_context(up); 1623ec3bebc6SGovindraj.R } 162494734749SGovindraj.R 162594734749SGovindraj.R /* Errata i291 */ 162694734749SGovindraj.R if (up->use_dma && pdata->set_noidle && 162794734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 162894734749SGovindraj.R pdata->set_noidle(up->pdev); 16292fd14964SGovindraj.R 16302fd14964SGovindraj.R up->latency = up->calc_latency; 16312fd14964SGovindraj.R schedule_work(&up->qos_work); 1632ec3bebc6SGovindraj.R } 16339f9ac1e8SGovindraj.R 1634fcdca757SGovindraj.R return 0; 1635fcdca757SGovindraj.R } 1636fcdca757SGovindraj.R #endif 1637fcdca757SGovindraj.R 1638fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1639fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1640fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1641fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1642fcdca757SGovindraj.R }; 1643fcdca757SGovindraj.R 1644d92b0dfcSRajendra Nayak #if defined(CONFIG_OF) 1645d92b0dfcSRajendra Nayak static const struct of_device_id omap_serial_of_match[] = { 1646d92b0dfcSRajendra Nayak { .compatible = "ti,omap2-uart" }, 1647d92b0dfcSRajendra Nayak { .compatible = "ti,omap3-uart" }, 1648d92b0dfcSRajendra Nayak { .compatible = "ti,omap4-uart" }, 1649d92b0dfcSRajendra Nayak {}, 1650d92b0dfcSRajendra Nayak }; 1651d92b0dfcSRajendra Nayak MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1652d92b0dfcSRajendra Nayak #endif 1653d92b0dfcSRajendra Nayak 1654ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1655ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1656ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1657ab4382d2SGreg Kroah-Hartman .driver = { 1658ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1659fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1660d92b0dfcSRajendra Nayak .of_match_table = of_match_ptr(omap_serial_of_match), 1661ab4382d2SGreg Kroah-Hartman }, 1662ab4382d2SGreg Kroah-Hartman }; 1663ab4382d2SGreg Kroah-Hartman 1664ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1665ab4382d2SGreg Kroah-Hartman { 1666ab4382d2SGreg Kroah-Hartman int ret; 1667ab4382d2SGreg Kroah-Hartman 1668ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1669ab4382d2SGreg Kroah-Hartman if (ret != 0) 1670ab4382d2SGreg Kroah-Hartman return ret; 1671ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1672ab4382d2SGreg Kroah-Hartman if (ret != 0) 1673ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1674ab4382d2SGreg Kroah-Hartman return ret; 1675ab4382d2SGreg Kroah-Hartman } 1676ab4382d2SGreg Kroah-Hartman 1677ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1678ab4382d2SGreg Kroah-Hartman { 1679ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1680ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1681ab4382d2SGreg Kroah-Hartman } 1682ab4382d2SGreg Kroah-Hartman 1683ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1684ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1685ab4382d2SGreg Kroah-Hartman 1686ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1687ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1688ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1689