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 490a697b22SPaul Walmsley /* SCR register bitmasks */ 500a697b22SPaul Walmsley #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) 510a697b22SPaul Walmsley #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6) 520a697b22SPaul Walmsley 530a697b22SPaul Walmsley /* FCR register bitmasks */ 540a697b22SPaul Walmsley #define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT 6 550a697b22SPaul Walmsley #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) 560a697b22SPaul Walmsley #define OMAP_UART_FCR_TX_FIFO_TRIG_SHIFT 4 570a697b22SPaul Walmsley 580a697b22SPaul Walmsley /* TLR register bitmasks */ 590a697b22SPaul Walmsley #define OMAP_UART_TLR_TX_FIFO_TRIG_DMA_SHIFT 0 600a697b22SPaul Walmsley 61ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 62ab4382d2SGreg Kroah-Hartman 63ab4382d2SGreg Kroah-Hartman /* Forward declaration of functions */ 64ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data); 65a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no); 66ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up); 6794734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 68ab4382d2SGreg Kroah-Hartman 692fd14964SGovindraj.R static struct workqueue_struct *serial_omap_uart_wq; 70ab4382d2SGreg Kroah-Hartman 71ab4382d2SGreg Kroah-Hartman static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 72ab4382d2SGreg Kroah-Hartman { 73ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 74ab4382d2SGreg Kroah-Hartman return readw(up->port.membase + offset); 75ab4382d2SGreg Kroah-Hartman } 76ab4382d2SGreg Kroah-Hartman 77ab4382d2SGreg Kroah-Hartman static inline void serial_out(struct uart_omap_port *up, int offset, int value) 78ab4382d2SGreg Kroah-Hartman { 79ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 80ab4382d2SGreg Kroah-Hartman writew(value, up->port.membase + offset); 81ab4382d2SGreg Kroah-Hartman } 82ab4382d2SGreg Kroah-Hartman 83ab4382d2SGreg Kroah-Hartman static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 84ab4382d2SGreg Kroah-Hartman { 85ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 86ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 87ab4382d2SGreg Kroah-Hartman UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 88ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, 0); 89ab4382d2SGreg Kroah-Hartman } 90ab4382d2SGreg Kroah-Hartman 91ab4382d2SGreg Kroah-Hartman /* 92ab4382d2SGreg Kroah-Hartman * serial_omap_get_divisor - calculate divisor value 93ab4382d2SGreg Kroah-Hartman * @port: uart port info 94ab4382d2SGreg Kroah-Hartman * @baud: baudrate for which divisor needs to be calculated. 95ab4382d2SGreg Kroah-Hartman * 96ab4382d2SGreg Kroah-Hartman * We have written our own function to get the divisor so as to support 97ab4382d2SGreg Kroah-Hartman * 13x mode. 3Mbps Baudrate as an different divisor. 98ab4382d2SGreg Kroah-Hartman * Reference OMAP TRM Chapter 17: 99ab4382d2SGreg Kroah-Hartman * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates 100ab4382d2SGreg Kroah-Hartman * referring to oversampling - divisor value 101ab4382d2SGreg Kroah-Hartman * baudrate 460,800 to 3,686,400 all have divisor 13 102ab4382d2SGreg Kroah-Hartman * except 3,000,000 which has divisor value 16 103ab4382d2SGreg Kroah-Hartman */ 104ab4382d2SGreg Kroah-Hartman static unsigned int 105ab4382d2SGreg Kroah-Hartman serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 106ab4382d2SGreg Kroah-Hartman { 107ab4382d2SGreg Kroah-Hartman unsigned int divisor; 108ab4382d2SGreg Kroah-Hartman 109ab4382d2SGreg Kroah-Hartman if (baud > OMAP_MODE13X_SPEED && baud != 3000000) 110ab4382d2SGreg Kroah-Hartman divisor = 13; 111ab4382d2SGreg Kroah-Hartman else 112ab4382d2SGreg Kroah-Hartman divisor = 16; 113ab4382d2SGreg Kroah-Hartman return port->uartclk/(baud * divisor); 114ab4382d2SGreg Kroah-Hartman } 115ab4382d2SGreg Kroah-Hartman 116ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rxdma(struct uart_omap_port *up) 117ab4382d2SGreg Kroah-Hartman { 118ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_used) { 119ab4382d2SGreg Kroah-Hartman del_timer(&up->uart_dma.rx_timer); 120ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.rx_dma_channel); 121ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.rx_dma_channel); 122ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 123ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = false; 124fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 125fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 126ab4382d2SGreg Kroah-Hartman } 127ab4382d2SGreg Kroah-Hartman } 128ab4382d2SGreg Kroah-Hartman 129ab4382d2SGreg Kroah-Hartman static void serial_omap_enable_ms(struct uart_port *port) 130ab4382d2SGreg Kroah-Hartman { 131ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 132ab4382d2SGreg Kroah-Hartman 133ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 134fcdca757SGovindraj.R 135fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 136ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 137ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 138fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 139ab4382d2SGreg Kroah-Hartman } 140ab4382d2SGreg Kroah-Hartman 141ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_tx(struct uart_port *port) 142ab4382d2SGreg Kroah-Hartman { 143ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 144ab4382d2SGreg Kroah-Hartman 145ab4382d2SGreg Kroah-Hartman if (up->use_dma && 146ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { 147ab4382d2SGreg Kroah-Hartman /* 148ab4382d2SGreg Kroah-Hartman * Check if dma is still active. If yes do nothing, 149ab4382d2SGreg Kroah-Hartman * return. Else stop dma 150ab4382d2SGreg Kroah-Hartman */ 151ab4382d2SGreg Kroah-Hartman if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel)) 152ab4382d2SGreg Kroah-Hartman return; 153ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 154ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.tx_dma_channel); 155ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 156fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 157fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 158ab4382d2SGreg Kroah-Hartman } 159ab4382d2SGreg Kroah-Hartman 160fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 161ab4382d2SGreg Kroah-Hartman if (up->ier & UART_IER_THRI) { 162ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_THRI; 163ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 164ab4382d2SGreg Kroah-Hartman } 165fcdca757SGovindraj.R 166fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 167fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 168ab4382d2SGreg Kroah-Hartman } 169ab4382d2SGreg Kroah-Hartman 170ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rx(struct uart_port *port) 171ab4382d2SGreg Kroah-Hartman { 172ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 173ab4382d2SGreg Kroah-Hartman 174fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 175ab4382d2SGreg Kroah-Hartman if (up->use_dma) 176ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 177ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_RLSI; 178ab4382d2SGreg Kroah-Hartman up->port.read_status_mask &= ~UART_LSR_DR; 179ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 180fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 181fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 182ab4382d2SGreg Kroah-Hartman } 183ab4382d2SGreg Kroah-Hartman 184da274686SGovindraj.R static inline void receive_chars(struct uart_omap_port *up, 185da274686SGovindraj.R unsigned int *status) 186ab4382d2SGreg Kroah-Hartman { 187ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = up->port.state->port.tty; 188da274686SGovindraj.R unsigned int flag, lsr = *status; 189da274686SGovindraj.R unsigned char ch = 0; 190ab4382d2SGreg Kroah-Hartman int max_count = 256; 191ab4382d2SGreg Kroah-Hartman 192ab4382d2SGreg Kroah-Hartman do { 193ab4382d2SGreg Kroah-Hartman if (likely(lsr & UART_LSR_DR)) 194ab4382d2SGreg Kroah-Hartman ch = serial_in(up, UART_RX); 195ab4382d2SGreg Kroah-Hartman flag = TTY_NORMAL; 196ab4382d2SGreg Kroah-Hartman up->port.icount.rx++; 197ab4382d2SGreg Kroah-Hartman 198ab4382d2SGreg Kroah-Hartman if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 199ab4382d2SGreg Kroah-Hartman /* 200ab4382d2SGreg Kroah-Hartman * For statistics only 201ab4382d2SGreg Kroah-Hartman */ 202ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) { 203ab4382d2SGreg Kroah-Hartman lsr &= ~(UART_LSR_FE | UART_LSR_PE); 204ab4382d2SGreg Kroah-Hartman up->port.icount.brk++; 205ab4382d2SGreg Kroah-Hartman /* 206ab4382d2SGreg Kroah-Hartman * We do the SysRQ and SAK checking 207ab4382d2SGreg Kroah-Hartman * here because otherwise the break 208ab4382d2SGreg Kroah-Hartman * may get masked by ignore_status_mask 209ab4382d2SGreg Kroah-Hartman * or read_status_mask. 210ab4382d2SGreg Kroah-Hartman */ 211ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&up->port)) 212ab4382d2SGreg Kroah-Hartman goto ignore_char; 213ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_PE) { 214ab4382d2SGreg Kroah-Hartman up->port.icount.parity++; 215ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_FE) { 216ab4382d2SGreg Kroah-Hartman up->port.icount.frame++; 217ab4382d2SGreg Kroah-Hartman } 218ab4382d2SGreg Kroah-Hartman 219ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_OE) 220ab4382d2SGreg Kroah-Hartman up->port.icount.overrun++; 221ab4382d2SGreg Kroah-Hartman 222ab4382d2SGreg Kroah-Hartman /* 223ab4382d2SGreg Kroah-Hartman * Mask off conditions which should be ignored. 224ab4382d2SGreg Kroah-Hartman */ 225ab4382d2SGreg Kroah-Hartman lsr &= up->port.read_status_mask; 226ab4382d2SGreg Kroah-Hartman 227ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 228ab4382d2SGreg Kroah-Hartman if (up->port.line == up->port.cons->index) { 229ab4382d2SGreg Kroah-Hartman /* Recover the break flag from console xmit */ 230ab4382d2SGreg Kroah-Hartman lsr |= up->lsr_break_flag; 231ab4382d2SGreg Kroah-Hartman } 232ab4382d2SGreg Kroah-Hartman #endif 233ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) 234ab4382d2SGreg Kroah-Hartman flag = TTY_BREAK; 235ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_PE) 236ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 237ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_FE) 238ab4382d2SGreg Kroah-Hartman flag = TTY_FRAME; 239ab4382d2SGreg Kroah-Hartman } 240ab4382d2SGreg Kroah-Hartman 241ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&up->port, ch)) 242ab4382d2SGreg Kroah-Hartman goto ignore_char; 243ab4382d2SGreg Kroah-Hartman uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 244ab4382d2SGreg Kroah-Hartman ignore_char: 245ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 246ab4382d2SGreg Kroah-Hartman } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 247ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 248ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(tty); 249ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 250ab4382d2SGreg Kroah-Hartman } 251ab4382d2SGreg Kroah-Hartman 252ab4382d2SGreg Kroah-Hartman static void transmit_chars(struct uart_omap_port *up) 253ab4382d2SGreg Kroah-Hartman { 254ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 255ab4382d2SGreg Kroah-Hartman int count; 256ab4382d2SGreg Kroah-Hartman 257ab4382d2SGreg Kroah-Hartman if (up->port.x_char) { 258ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, up->port.x_char); 259ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 260ab4382d2SGreg Kroah-Hartman up->port.x_char = 0; 261ab4382d2SGreg Kroah-Hartman return; 262ab4382d2SGreg Kroah-Hartman } 263ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 264ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 265ab4382d2SGreg Kroah-Hartman return; 266ab4382d2SGreg Kroah-Hartman } 267ab4382d2SGreg Kroah-Hartman count = up->port.fifosize / 4; 268ab4382d2SGreg Kroah-Hartman do { 269ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, xmit->buf[xmit->tail]); 270ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 271ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 272ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 273ab4382d2SGreg Kroah-Hartman break; 274ab4382d2SGreg Kroah-Hartman } while (--count > 0); 275ab4382d2SGreg Kroah-Hartman 276ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 277ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 278ab4382d2SGreg Kroah-Hartman 279ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 280ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 281ab4382d2SGreg Kroah-Hartman } 282ab4382d2SGreg Kroah-Hartman 283ab4382d2SGreg Kroah-Hartman static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 284ab4382d2SGreg Kroah-Hartman { 285ab4382d2SGreg Kroah-Hartman if (!(up->ier & UART_IER_THRI)) { 286ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_THRI; 287ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 288ab4382d2SGreg Kroah-Hartman } 289ab4382d2SGreg Kroah-Hartman } 290ab4382d2SGreg Kroah-Hartman 291ab4382d2SGreg Kroah-Hartman static void serial_omap_start_tx(struct uart_port *port) 292ab4382d2SGreg Kroah-Hartman { 293ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 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); 301fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 302fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 303ab4382d2SGreg Kroah-Hartman return; 304ab4382d2SGreg Kroah-Hartman } 305ab4382d2SGreg Kroah-Hartman 306ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_used) 307ab4382d2SGreg Kroah-Hartman return; 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman xmit = &up->port.state->xmit; 310ab4382d2SGreg Kroah-Hartman 311ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) { 312fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 313ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_tx, 314ab4382d2SGreg Kroah-Hartman "UART Tx DMA", 315ab4382d2SGreg Kroah-Hartman (void *)uart_tx_dma_callback, up, 316ab4382d2SGreg Kroah-Hartman &(up->uart_dma.tx_dma_channel)); 317ab4382d2SGreg Kroah-Hartman 318ab4382d2SGreg Kroah-Hartman if (ret < 0) { 319ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 320ab4382d2SGreg Kroah-Hartman return; 321ab4382d2SGreg Kroah-Hartman } 322ab4382d2SGreg Kroah-Hartman } 323ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 324ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = true; 325ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 326ab4382d2SGreg Kroah-Hartman 327ab4382d2SGreg Kroah-Hartman start = up->uart_dma.tx_buf_dma_phys + 328ab4382d2SGreg Kroah-Hartman (xmit->tail & (UART_XMIT_SIZE - 1)); 329ab4382d2SGreg Kroah-Hartman 330ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 331ab4382d2SGreg Kroah-Hartman /* 332ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 333ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 334ab4382d2SGreg Kroah-Hartman * transfers 335ab4382d2SGreg Kroah-Hartman */ 336ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 337ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 338ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 339ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + 340ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE) - start; 341ab4382d2SGreg Kroah-Hartman 342ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 343ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 344ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 345ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 346ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 347ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 348ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 349ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 350ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 351ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 352ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 353ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 354ab4382d2SGreg Kroah-Hartman } 355ab4382d2SGreg Kroah-Hartman 356ab4382d2SGreg Kroah-Hartman static unsigned int check_modem_status(struct uart_omap_port *up) 357ab4382d2SGreg Kroah-Hartman { 358ab4382d2SGreg Kroah-Hartman unsigned int status; 359ab4382d2SGreg Kroah-Hartman 360ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_MSR); 361ab4382d2SGreg Kroah-Hartman status |= up->msr_saved_flags; 362ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 363ab4382d2SGreg Kroah-Hartman if ((status & UART_MSR_ANY_DELTA) == 0) 364ab4382d2SGreg Kroah-Hartman return status; 365ab4382d2SGreg Kroah-Hartman 366ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 367ab4382d2SGreg Kroah-Hartman up->port.state != NULL) { 368ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_TERI) 369ab4382d2SGreg Kroah-Hartman up->port.icount.rng++; 370ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDSR) 371ab4382d2SGreg Kroah-Hartman up->port.icount.dsr++; 372ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDCD) 373ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change 374ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_DCD); 375ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCTS) 376ab4382d2SGreg Kroah-Hartman uart_handle_cts_change 377ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_CTS); 378ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&up->port.state->port.delta_msr_wait); 379ab4382d2SGreg Kroah-Hartman } 380ab4382d2SGreg Kroah-Hartman 381ab4382d2SGreg Kroah-Hartman return status; 382ab4382d2SGreg Kroah-Hartman } 383ab4382d2SGreg Kroah-Hartman 384ab4382d2SGreg Kroah-Hartman /** 385ab4382d2SGreg Kroah-Hartman * serial_omap_irq() - This handles the interrupt from one port 386ab4382d2SGreg Kroah-Hartman * @irq: uart port irq number 387ab4382d2SGreg Kroah-Hartman * @dev_id: uart port info 388ab4382d2SGreg Kroah-Hartman */ 389ab4382d2SGreg Kroah-Hartman static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) 390ab4382d2SGreg Kroah-Hartman { 391ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = dev_id; 392ab4382d2SGreg Kroah-Hartman unsigned int iir, lsr; 393ab4382d2SGreg Kroah-Hartman unsigned long flags; 394ab4382d2SGreg Kroah-Hartman 395fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 396ab4382d2SGreg Kroah-Hartman iir = serial_in(up, UART_IIR); 397fcdca757SGovindraj.R if (iir & UART_IIR_NO_INT) { 398fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 399fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 400ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 401fcdca757SGovindraj.R } 402ab4382d2SGreg Kroah-Hartman 403ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 404ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 405ab4382d2SGreg Kroah-Hartman if (iir & UART_IIR_RLSI) { 406ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 407ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_DR) 408ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 409ab4382d2SGreg Kroah-Hartman } else { 410ab4382d2SGreg Kroah-Hartman up->ier &= ~(UART_IER_RDI | UART_IER_RLSI); 411ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 412ab4382d2SGreg Kroah-Hartman if ((serial_omap_start_rxdma(up) != 0) && 413ab4382d2SGreg Kroah-Hartman (lsr & UART_LSR_DR)) 414ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 415ab4382d2SGreg Kroah-Hartman } 416ab4382d2SGreg Kroah-Hartman } 417ab4382d2SGreg Kroah-Hartman 418ab4382d2SGreg Kroah-Hartman check_modem_status(up); 419ab4382d2SGreg Kroah-Hartman if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) 420ab4382d2SGreg Kroah-Hartman transmit_chars(up); 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 423fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 424fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 425fcdca757SGovindraj.R 426ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 427ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 428ab4382d2SGreg Kroah-Hartman } 429ab4382d2SGreg Kroah-Hartman 430ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_tx_empty(struct uart_port *port) 431ab4382d2SGreg Kroah-Hartman { 432ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 433ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 434ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 435ab4382d2SGreg Kroah-Hartman 436fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 437ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 438ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 439ab4382d2SGreg Kroah-Hartman ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 440ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 441fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 442ab4382d2SGreg Kroah-Hartman return ret; 443ab4382d2SGreg Kroah-Hartman } 444ab4382d2SGreg Kroah-Hartman 445ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_get_mctrl(struct uart_port *port) 446ab4382d2SGreg Kroah-Hartman { 447ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 448514f31d1SShubhrajyoti D unsigned int status; 449ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 450ab4382d2SGreg Kroah-Hartman 451fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 452ab4382d2SGreg Kroah-Hartman status = check_modem_status(up); 453fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 454fcdca757SGovindraj.R 455ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCD) 458ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CAR; 459ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_RI) 460ab4382d2SGreg Kroah-Hartman ret |= TIOCM_RNG; 461ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DSR) 462ab4382d2SGreg Kroah-Hartman ret |= TIOCM_DSR; 463ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_CTS) 464ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CTS; 465ab4382d2SGreg Kroah-Hartman return ret; 466ab4382d2SGreg Kroah-Hartman } 467ab4382d2SGreg Kroah-Hartman 468ab4382d2SGreg Kroah-Hartman static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 469ab4382d2SGreg Kroah-Hartman { 470ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 471ab4382d2SGreg Kroah-Hartman unsigned char mcr = 0; 472ab4382d2SGreg Kroah-Hartman 473ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 474ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 475ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_RTS; 476ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_DTR) 477ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_DTR; 478ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT1) 479ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT1; 480ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT2) 481ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT2; 482ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_LOOP) 483ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_LOOP; 484ab4382d2SGreg Kroah-Hartman 485fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 486c538d20cSGovindraj.R up->mcr = serial_in(up, UART_MCR); 487c538d20cSGovindraj.R up->mcr |= mcr; 488c538d20cSGovindraj.R serial_out(up, UART_MCR, up->mcr); 489fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 490ab4382d2SGreg Kroah-Hartman } 491ab4382d2SGreg Kroah-Hartman 492ab4382d2SGreg Kroah-Hartman static void serial_omap_break_ctl(struct uart_port *port, int break_state) 493ab4382d2SGreg Kroah-Hartman { 494ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 495ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 496ab4382d2SGreg Kroah-Hartman 497ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 498fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 499ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 500ab4382d2SGreg Kroah-Hartman if (break_state == -1) 501ab4382d2SGreg Kroah-Hartman up->lcr |= UART_LCR_SBC; 502ab4382d2SGreg Kroah-Hartman else 503ab4382d2SGreg Kroah-Hartman up->lcr &= ~UART_LCR_SBC; 504ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 505ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 506fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 507ab4382d2SGreg Kroah-Hartman } 508ab4382d2SGreg Kroah-Hartman 509ab4382d2SGreg Kroah-Hartman static int serial_omap_startup(struct uart_port *port) 510ab4382d2SGreg Kroah-Hartman { 511ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 512ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 513ab4382d2SGreg Kroah-Hartman int retval; 514ab4382d2SGreg Kroah-Hartman 515ab4382d2SGreg Kroah-Hartman /* 516ab4382d2SGreg Kroah-Hartman * Allocate the IRQ 517ab4382d2SGreg Kroah-Hartman */ 518ab4382d2SGreg Kroah-Hartman retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 519ab4382d2SGreg Kroah-Hartman up->name, up); 520ab4382d2SGreg Kroah-Hartman if (retval) 521ab4382d2SGreg Kroah-Hartman return retval; 522ab4382d2SGreg Kroah-Hartman 523ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 524ab4382d2SGreg Kroah-Hartman 525fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 526ab4382d2SGreg Kroah-Hartman /* 527ab4382d2SGreg Kroah-Hartman * Clear the FIFO buffers and disable them. 528ab4382d2SGreg Kroah-Hartman * (they will be reenabled in set_termios()) 529ab4382d2SGreg Kroah-Hartman */ 530ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 531ab4382d2SGreg Kroah-Hartman /* For Hardware flow control */ 532ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, UART_MCR_RTS); 533ab4382d2SGreg Kroah-Hartman 534ab4382d2SGreg Kroah-Hartman /* 535ab4382d2SGreg Kroah-Hartman * Clear the interrupt registers. 536ab4382d2SGreg Kroah-Hartman */ 537ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_LSR); 538ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 539ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 540ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_IIR); 541ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_MSR); 542ab4382d2SGreg Kroah-Hartman 543ab4382d2SGreg Kroah-Hartman /* 544ab4382d2SGreg Kroah-Hartman * Now, initialize the UART 545ab4382d2SGreg Kroah-Hartman */ 546ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_WLEN8); 547ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 548ab4382d2SGreg Kroah-Hartman /* 549ab4382d2SGreg Kroah-Hartman * Most PC uarts need OUT2 raised to enable interrupts. 550ab4382d2SGreg Kroah-Hartman */ 551ab4382d2SGreg Kroah-Hartman up->port.mctrl |= TIOCM_OUT2; 552ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 553ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 554ab4382d2SGreg Kroah-Hartman 555ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 556ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 557ab4382d2SGreg Kroah-Hartman free_page((unsigned long)up->port.state->xmit.buf); 558ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = dma_alloc_coherent(NULL, 559ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, 560ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 561ab4382d2SGreg Kroah-Hartman 0); 562ab4382d2SGreg Kroah-Hartman init_timer(&(up->uart_dma.rx_timer)); 563a9e210e0SJon Hunter up->uart_dma.rx_timer.function = serial_omap_rxdma_poll; 564ba77433dSRajendra Nayak up->uart_dma.rx_timer.data = up->port.line; 565ab4382d2SGreg Kroah-Hartman /* Currently the buffer size is 4KB. Can increase it */ 566ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = dma_alloc_coherent(NULL, 567ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 568ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0); 569ab4382d2SGreg Kroah-Hartman } 570ab4382d2SGreg Kroah-Hartman /* 571ab4382d2SGreg Kroah-Hartman * Finally, enable interrupts. Note: Modem status interrupts 572ab4382d2SGreg Kroah-Hartman * are set via set_termios(), which will be occurring imminently 573ab4382d2SGreg Kroah-Hartman * anyway, so we don't enable them here. 574ab4382d2SGreg Kroah-Hartman */ 575ab4382d2SGreg Kroah-Hartman up->ier = UART_IER_RLSI | UART_IER_RDI; 576ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 577ab4382d2SGreg Kroah-Hartman 57878841462SJarkko Nikula /* Enable module level wake up */ 57978841462SJarkko Nikula serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); 58078841462SJarkko Nikula 581fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 582fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 583ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 584ab4382d2SGreg Kroah-Hartman return 0; 585ab4382d2SGreg Kroah-Hartman } 586ab4382d2SGreg Kroah-Hartman 587ab4382d2SGreg Kroah-Hartman static void serial_omap_shutdown(struct uart_port *port) 588ab4382d2SGreg Kroah-Hartman { 589ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 590ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 591ab4382d2SGreg Kroah-Hartman 592ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); 593fcdca757SGovindraj.R 594fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 595ab4382d2SGreg Kroah-Hartman /* 596ab4382d2SGreg Kroah-Hartman * Disable interrupts from this port 597ab4382d2SGreg Kroah-Hartman */ 598ab4382d2SGreg Kroah-Hartman up->ier = 0; 599ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 600ab4382d2SGreg Kroah-Hartman 601ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 602ab4382d2SGreg Kroah-Hartman up->port.mctrl &= ~TIOCM_OUT2; 603ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 604ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 605ab4382d2SGreg Kroah-Hartman 606ab4382d2SGreg Kroah-Hartman /* 607ab4382d2SGreg Kroah-Hartman * Disable break condition and FIFOs 608ab4382d2SGreg Kroah-Hartman */ 609ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 610ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 611ab4382d2SGreg Kroah-Hartman 612ab4382d2SGreg Kroah-Hartman /* 613ab4382d2SGreg Kroah-Hartman * Read data port to reset things, and then free the irq 614ab4382d2SGreg Kroah-Hartman */ 615ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 616ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 617ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 618ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 619ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, up->port.state->xmit.buf, 620ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys); 621ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = NULL; 622ab4382d2SGreg Kroah-Hartman serial_omap_stop_rx(port); 623ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 624ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, up->uart_dma.rx_buf, 625ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys); 626ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = NULL; 627ab4382d2SGreg Kroah-Hartman } 628fcdca757SGovindraj.R 629fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 630ab4382d2SGreg Kroah-Hartman free_irq(up->port.irq, up); 631ab4382d2SGreg Kroah-Hartman } 632ab4382d2SGreg Kroah-Hartman 633ab4382d2SGreg Kroah-Hartman static inline void 634ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff 635ab4382d2SGreg Kroah-Hartman (struct uart_omap_port *up, struct ktermios *termios) 636ab4382d2SGreg Kroah-Hartman { 637ab4382d2SGreg Kroah-Hartman up->lcr = serial_in(up, UART_LCR); 638ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 639ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 640ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); 641ab4382d2SGreg Kroah-Hartman 642ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XON1, termios->c_cc[VSTART]); 643ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 644ab4382d2SGreg Kroah-Hartman 645ab4382d2SGreg Kroah-Hartman /* clear SW control mode bits */ 646c538d20cSGovindraj.R up->efr &= OMAP_UART_SW_CLR; 647ab4382d2SGreg Kroah-Hartman 648ab4382d2SGreg Kroah-Hartman /* 649ab4382d2SGreg Kroah-Hartman * IXON Flag: 650ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 651ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 652ab4382d2SGreg Kroah-Hartman */ 653ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 654c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_TX; 655ab4382d2SGreg Kroah-Hartman 656ab4382d2SGreg Kroah-Hartman /* 657ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 658ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 659ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 660ab4382d2SGreg Kroah-Hartman */ 661ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 662c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_RX; 663ab4382d2SGreg Kroah-Hartman 664ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 665ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 666ab4382d2SGreg Kroah-Hartman 667ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 668ab4382d2SGreg Kroah-Hartman 669ab4382d2SGreg Kroah-Hartman /* 670ab4382d2SGreg Kroah-Hartman * IXANY Flag: 671ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 672ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 673ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 674ab4382d2SGreg Kroah-Hartman */ 675ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 676ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 677ab4382d2SGreg Kroah-Hartman 678ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 679ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 680ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 681ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 682ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 683ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 684ab4382d2SGreg Kroah-Hartman */ 685c538d20cSGovindraj.R serial_out(up, UART_EFR, up->efr | UART_EFR_SCD); 686ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 687ab4382d2SGreg Kroah-Hartman 688ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 689ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 690ab4382d2SGreg Kroah-Hartman } 691ab4382d2SGreg Kroah-Hartman 6922fd14964SGovindraj.R static void serial_omap_uart_qos_work(struct work_struct *work) 6932fd14964SGovindraj.R { 6942fd14964SGovindraj.R struct uart_omap_port *up = container_of(work, struct uart_omap_port, 6952fd14964SGovindraj.R qos_work); 6962fd14964SGovindraj.R 6972fd14964SGovindraj.R pm_qos_update_request(&up->pm_qos_request, up->latency); 6982fd14964SGovindraj.R } 6992fd14964SGovindraj.R 700ab4382d2SGreg Kroah-Hartman static void 701ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 702ab4382d2SGreg Kroah-Hartman struct ktermios *old) 703ab4382d2SGreg Kroah-Hartman { 704ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 705ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 706ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 707ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 708ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 7090a697b22SPaul Walmsley u32 tlr; 710ab4382d2SGreg Kroah-Hartman 711ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 712ab4382d2SGreg Kroah-Hartman case CS5: 713ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 714ab4382d2SGreg Kroah-Hartman break; 715ab4382d2SGreg Kroah-Hartman case CS6: 716ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 717ab4382d2SGreg Kroah-Hartman break; 718ab4382d2SGreg Kroah-Hartman case CS7: 719ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 720ab4382d2SGreg Kroah-Hartman break; 721ab4382d2SGreg Kroah-Hartman default: 722ab4382d2SGreg Kroah-Hartman case CS8: 723ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 724ab4382d2SGreg Kroah-Hartman break; 725ab4382d2SGreg Kroah-Hartman } 726ab4382d2SGreg Kroah-Hartman 727ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 728ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 729ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 730ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 731ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 732ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 733ab4382d2SGreg Kroah-Hartman 734ab4382d2SGreg Kroah-Hartman /* 735ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 736ab4382d2SGreg Kroah-Hartman */ 737ab4382d2SGreg Kroah-Hartman 738ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 739ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 740ab4382d2SGreg Kroah-Hartman 7412fd14964SGovindraj.R /* calculate wakeup latency constraint */ 7422fd14964SGovindraj.R up->calc_latency = (1000000 * up->port.fifosize) / 7432fd14964SGovindraj.R (1000 * baud / 8); 7442fd14964SGovindraj.R up->latency = up->calc_latency; 7452fd14964SGovindraj.R schedule_work(&up->qos_work); 7462fd14964SGovindraj.R 747c538d20cSGovindraj.R up->dll = quot & 0xff; 748c538d20cSGovindraj.R up->dlh = quot >> 8; 749c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_DISABLE; 750c538d20cSGovindraj.R 751ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 752ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 753ab4382d2SGreg Kroah-Hartman if (up->use_dma) 754ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 755ab4382d2SGreg Kroah-Hartman 756ab4382d2SGreg Kroah-Hartman /* 757ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 758ab4382d2SGreg Kroah-Hartman * interrupts disabled. 759ab4382d2SGreg Kroah-Hartman */ 760fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 761ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 762ab4382d2SGreg Kroah-Hartman 763ab4382d2SGreg Kroah-Hartman /* 764ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 765ab4382d2SGreg Kroah-Hartman */ 766ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 767ab4382d2SGreg Kroah-Hartman 768ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 769ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 770ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 771ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 772ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 773ab4382d2SGreg Kroah-Hartman 774ab4382d2SGreg Kroah-Hartman /* 775ab4382d2SGreg Kroah-Hartman * Characters to ignore 776ab4382d2SGreg Kroah-Hartman */ 777ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 778ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 779ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 780ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 781ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 782ab4382d2SGreg Kroah-Hartman /* 783ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 784ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 785ab4382d2SGreg Kroah-Hartman */ 786ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 787ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 788ab4382d2SGreg Kroah-Hartman } 789ab4382d2SGreg Kroah-Hartman 790ab4382d2SGreg Kroah-Hartman /* 791ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 792ab4382d2SGreg Kroah-Hartman */ 793ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 794ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 795ab4382d2SGreg Kroah-Hartman 796ab4382d2SGreg Kroah-Hartman /* 797ab4382d2SGreg Kroah-Hartman * Modem status interrupts 798ab4382d2SGreg Kroah-Hartman */ 799ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 800ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 801ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 802ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 803ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 804c538d20cSGovindraj.R up->lcr = cval; 80532212897SGovindraj.R up->scr = OMAP_UART_SCR_TX_EMPTY; 806ab4382d2SGreg Kroah-Hartman 807ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 808ab4382d2SGreg Kroah-Hartman 809ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 810ab4382d2SGreg Kroah-Hartman * baud clock is not running 811ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 812ab4382d2SGreg Kroah-Hartman */ 813ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 814ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 815ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 816ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 817ab4382d2SGreg Kroah-Hartman 818ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 819ab4382d2SGreg Kroah-Hartman 820ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 821ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 822ab4382d2SGreg Kroah-Hartman 823ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 824ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 825ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 826ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 8270a697b22SPaul Walmsley 8280a697b22SPaul Walmsley up->scr |= OMAP_UART_SCR_TX_TRIG_GRANU1_MASK; 8290a697b22SPaul Walmsley up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 8320a697b22SPaul Walmsley tlr = 0; 8330a697b22SPaul Walmsley } else { 8340a697b22SPaul Walmsley up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 8350a697b22SPaul Walmsley 8360a697b22SPaul Walmsley /* Set receive FIFO threshold to 1 */ 8370a697b22SPaul Walmsley up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 8380a697b22SPaul Walmsley up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT); 8390a697b22SPaul Walmsley 8400a697b22SPaul Walmsley /* Set TX FIFO threshold to "63" (actually 1) */ 8410a697b22SPaul Walmsley up->fcr |= (0x3 << OMAP_UART_FCR_TX_FIFO_TRIG_SHIFT); 8420a697b22SPaul Walmsley tlr = (0xf << OMAP_UART_TLR_TX_FIFO_TRIG_DMA_SHIFT); 843ab4382d2SGreg Kroah-Hartman } 844ab4382d2SGreg Kroah-Hartman 8450a697b22SPaul Walmsley serial_out(up, UART_TI752_TLR, tlr); 8460a697b22SPaul Walmsley serial_out(up, UART_FCR, up->fcr); 8470a697b22SPaul Walmsley serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 8480a697b22SPaul Walmsley 849c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 850c538d20cSGovindraj.R 851ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 852ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 853ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 856ab4382d2SGreg Kroah-Hartman 85794734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 85894734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 85994734749SGovindraj.R else 860c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 86194734749SGovindraj.R 862ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 863ab4382d2SGreg Kroah-Hartman 864ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 865ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 866ab4382d2SGreg Kroah-Hartman 867ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 868ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 869ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 870ab4382d2SGreg Kroah-Hartman 871c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 872c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 873ab4382d2SGreg Kroah-Hartman 874ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 875ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 876ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 877ab4382d2SGreg Kroah-Hartman 878ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 879ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 880ab4382d2SGreg Kroah-Hartman 881ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 882c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_13X_MODE; 883ab4382d2SGreg Kroah-Hartman else 884c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_16X_MODE; 885c538d20cSGovindraj.R 88694734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 88794734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 88894734749SGovindraj.R else 889c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 890ab4382d2SGreg Kroah-Hartman 891ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 892ab4382d2SGreg Kroah-Hartman 893ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 894ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 895ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 896ab4382d2SGreg Kroah-Hartman 897ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 898ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 899ab4382d2SGreg Kroah-Hartman 900ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 901ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 902ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 903ab4382d2SGreg Kroah-Hartman 904ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 905ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 906ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 907ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 908ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 909ab4382d2SGreg Kroah-Hartman } 910ab4382d2SGreg Kroah-Hartman 911ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 912ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 913ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 914ab4382d2SGreg Kroah-Hartman 915ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 916fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 917ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 918ab4382d2SGreg Kroah-Hartman } 919ab4382d2SGreg Kroah-Hartman 920ab4382d2SGreg Kroah-Hartman static void 921ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 922ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 923ab4382d2SGreg Kroah-Hartman { 924ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 925ab4382d2SGreg Kroah-Hartman unsigned char efr; 926ab4382d2SGreg Kroah-Hartman 927ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 928fcdca757SGovindraj.R 929fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 930ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 931ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 932ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 933ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 934ab4382d2SGreg Kroah-Hartman 935ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 936ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 937ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 938ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 939fcdca757SGovindraj.R 940fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 941fcdca757SGovindraj.R if (!state) 942fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 943fcdca757SGovindraj.R else 944fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 945fcdca757SGovindraj.R } 946fcdca757SGovindraj.R 947fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 948ab4382d2SGreg Kroah-Hartman } 949ab4382d2SGreg Kroah-Hartman 950ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 951ab4382d2SGreg Kroah-Hartman { 952ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 953ab4382d2SGreg Kroah-Hartman } 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 956ab4382d2SGreg Kroah-Hartman { 957ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 958ab4382d2SGreg Kroah-Hartman return 0; 959ab4382d2SGreg Kroah-Hartman } 960ab4382d2SGreg Kroah-Hartman 961ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 962ab4382d2SGreg Kroah-Hartman { 963ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 964ab4382d2SGreg Kroah-Hartman 965ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 966ba77433dSRajendra Nayak up->port.line); 967ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 968ab4382d2SGreg Kroah-Hartman } 969ab4382d2SGreg Kroah-Hartman 970ab4382d2SGreg Kroah-Hartman static int 971ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 972ab4382d2SGreg Kroah-Hartman { 973ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 974ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 975ab4382d2SGreg Kroah-Hartman return -EINVAL; 976ab4382d2SGreg Kroah-Hartman } 977ab4382d2SGreg Kroah-Hartman 978ab4382d2SGreg Kroah-Hartman static const char * 979ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 980ab4382d2SGreg Kroah-Hartman { 981ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 982ab4382d2SGreg Kroah-Hartman 983ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 984ab4382d2SGreg Kroah-Hartman return up->name; 985ab4382d2SGreg Kroah-Hartman } 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 988ab4382d2SGreg Kroah-Hartman 989ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 990ab4382d2SGreg Kroah-Hartman { 991ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 992ab4382d2SGreg Kroah-Hartman 993ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 994ab4382d2SGreg Kroah-Hartman do { 995ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 996ab4382d2SGreg Kroah-Hartman 997ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 998ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 999ab4382d2SGreg Kroah-Hartman 1000ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 1001ab4382d2SGreg Kroah-Hartman break; 1002ab4382d2SGreg Kroah-Hartman udelay(1); 1003ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 1004ab4382d2SGreg Kroah-Hartman 1005ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 1006ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 1007ab4382d2SGreg Kroah-Hartman tmout = 1000000; 1008ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 1009ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 1010ab4382d2SGreg Kroah-Hartman 1011ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1012ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 1013ab4382d2SGreg Kroah-Hartman break; 1014ab4382d2SGreg Kroah-Hartman 1015ab4382d2SGreg Kroah-Hartman udelay(1); 1016ab4382d2SGreg Kroah-Hartman } 1017ab4382d2SGreg Kroah-Hartman } 1018ab4382d2SGreg Kroah-Hartman } 1019ab4382d2SGreg Kroah-Hartman 1020ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1021ab4382d2SGreg Kroah-Hartman 1022ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1023ab4382d2SGreg Kroah-Hartman { 1024ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1025fcdca757SGovindraj.R 1026fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1027ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1028ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1029fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 1030ab4382d2SGreg Kroah-Hartman } 1031ab4382d2SGreg Kroah-Hartman 1032ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 1033ab4382d2SGreg Kroah-Hartman { 1034ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1035fcdca757SGovindraj.R unsigned int status; 1036ab4382d2SGreg Kroah-Hartman 1037fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1038fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 1039ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 1040ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 1041ab4382d2SGreg Kroah-Hartman 1042fcdca757SGovindraj.R status = serial_in(up, UART_RX); 1043fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 1044fcdca757SGovindraj.R return status; 1045ab4382d2SGreg Kroah-Hartman } 1046ab4382d2SGreg Kroah-Hartman 1047ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 1048ab4382d2SGreg Kroah-Hartman 1049ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1050ab4382d2SGreg Kroah-Hartman 1051ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 1052ab4382d2SGreg Kroah-Hartman 1053ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 1054ab4382d2SGreg Kroah-Hartman 1055ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 1056ab4382d2SGreg Kroah-Hartman { 1057ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1058ab4382d2SGreg Kroah-Hartman 1059ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1060ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1061ab4382d2SGreg Kroah-Hartman } 1062ab4382d2SGreg Kroah-Hartman 1063ab4382d2SGreg Kroah-Hartman static void 1064ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1065ab4382d2SGreg Kroah-Hartman unsigned int count) 1066ab4382d2SGreg Kroah-Hartman { 1067ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1068ab4382d2SGreg Kroah-Hartman unsigned long flags; 1069ab4382d2SGreg Kroah-Hartman unsigned int ier; 1070ab4382d2SGreg Kroah-Hartman int locked = 1; 1071ab4382d2SGreg Kroah-Hartman 1072fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1073fcdca757SGovindraj.R 1074ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1075ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1076ab4382d2SGreg Kroah-Hartman locked = 0; 1077ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1078ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1079ab4382d2SGreg Kroah-Hartman else 1080ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman /* 1083ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1084ab4382d2SGreg Kroah-Hartman */ 1085ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1086ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1087ab4382d2SGreg Kroah-Hartman 1088ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1089ab4382d2SGreg Kroah-Hartman 1090ab4382d2SGreg Kroah-Hartman /* 1091ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1092ab4382d2SGreg Kroah-Hartman * and restore the IER 1093ab4382d2SGreg Kroah-Hartman */ 1094ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1095ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1096ab4382d2SGreg Kroah-Hartman /* 1097ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1098ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1099ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1100ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1101ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1102ab4382d2SGreg Kroah-Hartman */ 1103ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1104ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1105ab4382d2SGreg Kroah-Hartman 1106fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1107fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1108ab4382d2SGreg Kroah-Hartman if (locked) 1109ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1110ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1111ab4382d2SGreg Kroah-Hartman } 1112ab4382d2SGreg Kroah-Hartman 1113ab4382d2SGreg Kroah-Hartman static int __init 1114ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1115ab4382d2SGreg Kroah-Hartman { 1116ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1117ab4382d2SGreg Kroah-Hartman int baud = 115200; 1118ab4382d2SGreg Kroah-Hartman int bits = 8; 1119ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1120ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1121ab4382d2SGreg Kroah-Hartman 1122ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1123ab4382d2SGreg Kroah-Hartman return -ENODEV; 1124ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1125ab4382d2SGreg Kroah-Hartman 1126ab4382d2SGreg Kroah-Hartman if (options) 1127ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1128ab4382d2SGreg Kroah-Hartman 1129ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1130ab4382d2SGreg Kroah-Hartman } 1131ab4382d2SGreg Kroah-Hartman 1132ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1133ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1134ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1135ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1136ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1137ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1138ab4382d2SGreg Kroah-Hartman .index = -1, 1139ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1140ab4382d2SGreg Kroah-Hartman }; 1141ab4382d2SGreg Kroah-Hartman 1142ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1143ab4382d2SGreg Kroah-Hartman { 1144ba77433dSRajendra Nayak serial_omap_console_ports[up->port.line] = up; 1145ab4382d2SGreg Kroah-Hartman } 1146ab4382d2SGreg Kroah-Hartman 1147ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1148ab4382d2SGreg Kroah-Hartman 1149ab4382d2SGreg Kroah-Hartman #else 1150ab4382d2SGreg Kroah-Hartman 1151ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1152ab4382d2SGreg Kroah-Hartman 1153ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1154ab4382d2SGreg Kroah-Hartman {} 1155ab4382d2SGreg Kroah-Hartman 1156ab4382d2SGreg Kroah-Hartman #endif 1157ab4382d2SGreg Kroah-Hartman 1158ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1159ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1160ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1161ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1162ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1163ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1164ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1165ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1166ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1167ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1168ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1169ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1170ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1171ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1172ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1173ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1174ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1175ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1176ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1177ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1178ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1179ab4382d2SGreg Kroah-Hartman #endif 1180ab4382d2SGreg Kroah-Hartman }; 1181ab4382d2SGreg Kroah-Hartman 1182ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1183ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1184ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1185ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1186ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1187ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1188ab4382d2SGreg Kroah-Hartman }; 1189ab4382d2SGreg Kroah-Hartman 11903bc4f0d8SShubhrajyoti D #ifdef CONFIG_PM_SLEEP 1191fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1192ab4382d2SGreg Kroah-Hartman { 1193fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1194ab4382d2SGreg Kroah-Hartman 11952fd14964SGovindraj.R if (up) { 1196ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 11972fd14964SGovindraj.R flush_work_sync(&up->qos_work); 11982fd14964SGovindraj.R } 11992fd14964SGovindraj.R 1200ab4382d2SGreg Kroah-Hartman return 0; 1201ab4382d2SGreg Kroah-Hartman } 1202ab4382d2SGreg Kroah-Hartman 1203fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1204ab4382d2SGreg Kroah-Hartman { 1205fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1206ab4382d2SGreg Kroah-Hartman 1207ab4382d2SGreg Kroah-Hartman if (up) 1208ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1209ab4382d2SGreg Kroah-Hartman return 0; 1210ab4382d2SGreg Kroah-Hartman } 1211fcdca757SGovindraj.R #endif 1212ab4382d2SGreg Kroah-Hartman 1213a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no) 1214ab4382d2SGreg Kroah-Hartman { 1215ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1216ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1217ab4382d2SGreg Kroah-Hartman int ret = 0; 1218ab4382d2SGreg Kroah-Hartman 1219ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1220ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1221ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1222ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1223a9e210e0SJon Hunter up->uart_dma.rx_timeout) { 1224ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1225a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1226ab4382d2SGreg Kroah-Hartman } else { 1227ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1228ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1229ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1230ab4382d2SGreg Kroah-Hartman } 1231ab4382d2SGreg Kroah-Hartman return; 1232ab4382d2SGreg Kroah-Hartman } 1233ab4382d2SGreg Kroah-Hartman 1234ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1235ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1236ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1237ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1238ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1239ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1240ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1241ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1242ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1243ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1244ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1245ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1246ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1247ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1248ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1249ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1250ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1251ab4382d2SGreg Kroah-Hartman } 1252ab4382d2SGreg Kroah-Hartman } else { 1253ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1254a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1255ab4382d2SGreg Kroah-Hartman } 1256ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1257ab4382d2SGreg Kroah-Hartman } 1258ab4382d2SGreg Kroah-Hartman 1259ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1260ab4382d2SGreg Kroah-Hartman { 1261ab4382d2SGreg Kroah-Hartman return; 1262ab4382d2SGreg Kroah-Hartman } 1263ab4382d2SGreg Kroah-Hartman 1264ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1265ab4382d2SGreg Kroah-Hartman { 1266ab4382d2SGreg Kroah-Hartman int ret = 0; 1267ab4382d2SGreg Kroah-Hartman 1268ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1269fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1270ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1271ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1272ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1273ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1274ab4382d2SGreg Kroah-Hartman if (ret < 0) 1275ab4382d2SGreg Kroah-Hartman return ret; 1276ab4382d2SGreg Kroah-Hartman 1277ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1278ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1279ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1280ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1281ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1282ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1283ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1284ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1285ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1286ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1287ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1288ab4382d2SGreg Kroah-Hartman } 1289ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1290ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1291ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1292ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1293a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1294ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1295ab4382d2SGreg Kroah-Hartman return ret; 1296ab4382d2SGreg Kroah-Hartman } 1297ab4382d2SGreg Kroah-Hartman 1298ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1299ab4382d2SGreg Kroah-Hartman { 1300ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1301ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1302ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1303ab4382d2SGreg Kroah-Hartman 1304ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1305ab4382d2SGreg Kroah-Hartman return; 1306ab4382d2SGreg Kroah-Hartman 1307ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1308ab4382d2SGreg Kroah-Hartman /* 1309ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1310ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1311ab4382d2SGreg Kroah-Hartman * transfers 1312ab4382d2SGreg Kroah-Hartman */ 1313ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1314ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1315ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1316ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1317ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1318ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1319ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1320ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1321ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1322ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1323ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1324ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1325ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1326ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1327ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1328ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1329ab4382d2SGreg Kroah-Hartman } 1330ab4382d2SGreg Kroah-Hartman 1331ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1332ab4382d2SGreg Kroah-Hartman { 1333ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1334ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1335ab4382d2SGreg Kroah-Hartman 1336ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1337ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1338ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1339ab4382d2SGreg Kroah-Hartman 1340ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1341ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1342ab4382d2SGreg Kroah-Hartman 1343ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1344ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1345ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1346ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1347ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1348ab4382d2SGreg Kroah-Hartman } else { 1349ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1350ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1351ab4382d2SGreg Kroah-Hartman } 1352ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1353ab4382d2SGreg Kroah-Hartman return; 1354ab4382d2SGreg Kroah-Hartman } 1355ab4382d2SGreg Kroah-Hartman 1356d92b0dfcSRajendra Nayak static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) 1357d92b0dfcSRajendra Nayak { 1358d92b0dfcSRajendra Nayak struct omap_uart_port_info *omap_up_info; 1359d92b0dfcSRajendra Nayak 1360d92b0dfcSRajendra Nayak omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); 1361d92b0dfcSRajendra Nayak if (!omap_up_info) 1362d92b0dfcSRajendra Nayak return NULL; /* out of memory */ 1363d92b0dfcSRajendra Nayak 1364d92b0dfcSRajendra Nayak of_property_read_u32(dev->of_node, "clock-frequency", 1365d92b0dfcSRajendra Nayak &omap_up_info->uartclk); 1366d92b0dfcSRajendra Nayak return omap_up_info; 1367d92b0dfcSRajendra Nayak } 1368d92b0dfcSRajendra Nayak 1369ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1370ab4382d2SGreg Kroah-Hartman { 1371ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1372ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1373ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1374ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1375ab4382d2SGreg Kroah-Hartman 1376d92b0dfcSRajendra Nayak if (pdev->dev.of_node) 1377d92b0dfcSRajendra Nayak omap_up_info = of_get_uart_port_info(&pdev->dev); 1378d92b0dfcSRajendra Nayak 1379ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1380ab4382d2SGreg Kroah-Hartman if (!mem) { 1381ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1382ab4382d2SGreg Kroah-Hartman return -ENODEV; 1383ab4382d2SGreg Kroah-Hartman } 1384ab4382d2SGreg Kroah-Hartman 1385ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1386ab4382d2SGreg Kroah-Hartman if (!irq) { 1387ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1388ab4382d2SGreg Kroah-Hartman return -ENODEV; 1389ab4382d2SGreg Kroah-Hartman } 1390ab4382d2SGreg Kroah-Hartman 139128f65c11SJoe Perches if (!request_mem_region(mem->start, resource_size(mem), 1392ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1393ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1394ab4382d2SGreg Kroah-Hartman return -EBUSY; 1395ab4382d2SGreg Kroah-Hartman } 1396ab4382d2SGreg Kroah-Hartman 1397ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1398ab4382d2SGreg Kroah-Hartman if (!dma_rx) { 1399ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1400ab4382d2SGreg Kroah-Hartman goto err; 1401ab4382d2SGreg Kroah-Hartman } 1402ab4382d2SGreg Kroah-Hartman 1403ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1404ab4382d2SGreg Kroah-Hartman if (!dma_tx) { 1405ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1406ab4382d2SGreg Kroah-Hartman goto err; 1407ab4382d2SGreg Kroah-Hartman } 1408ab4382d2SGreg Kroah-Hartman 1409ab4382d2SGreg Kroah-Hartman up = kzalloc(sizeof(*up), GFP_KERNEL); 1410ab4382d2SGreg Kroah-Hartman if (up == NULL) { 1411ab4382d2SGreg Kroah-Hartman ret = -ENOMEM; 1412ab4382d2SGreg Kroah-Hartman goto do_release_region; 1413ab4382d2SGreg Kroah-Hartman } 1414ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1415ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1416ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1417ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1418ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1419ab4382d2SGreg Kroah-Hartman 1420ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1421ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1422ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1423ab4382d2SGreg Kroah-Hartman 1424d92b0dfcSRajendra Nayak if (pdev->dev.of_node) 1425d92b0dfcSRajendra Nayak up->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); 1426d92b0dfcSRajendra Nayak else 1427ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1428ab4382d2SGreg Kroah-Hartman 1429d92b0dfcSRajendra Nayak if (up->port.line < 0) { 1430d92b0dfcSRajendra Nayak dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", 1431d92b0dfcSRajendra Nayak up->port.line); 1432d92b0dfcSRajendra Nayak ret = -ENODEV; 1433d92b0dfcSRajendra Nayak goto err; 1434d92b0dfcSRajendra Nayak } 1435d92b0dfcSRajendra Nayak 1436d92b0dfcSRajendra Nayak sprintf(up->name, "OMAP UART%d", up->port.line); 1437edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1438edd70ad7SGovindraj.R up->port.membase = ioremap(mem->start, resource_size(mem)); 1439edd70ad7SGovindraj.R if (!up->port.membase) { 1440edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1441edd70ad7SGovindraj.R ret = -ENOMEM; 1442edd70ad7SGovindraj.R goto err; 1443edd70ad7SGovindraj.R } 1444edd70ad7SGovindraj.R 1445ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1446ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 14478fe789dcSRajendra Nayak if (!up->port.uartclk) { 14488fe789dcSRajendra Nayak up->port.uartclk = DEFAULT_CLK_SPEED; 14498fe789dcSRajendra Nayak dev_warn(&pdev->dev, "No clock speed specified: using default:" 14508fe789dcSRajendra Nayak "%d\n", DEFAULT_CLK_SPEED); 14518fe789dcSRajendra Nayak } 1452ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 145394734749SGovindraj.R up->errata = omap_up_info->errata; 1454ab4382d2SGreg Kroah-Hartman 1455ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1456ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1457ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1458ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1459c86845dbSDeepak K up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size; 1460c86845dbSDeepak K up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout; 1461a9e210e0SJon Hunter up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate; 1462ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1463ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1464ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1465ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1466ab4382d2SGreg Kroah-Hartman } 1467ab4382d2SGreg Kroah-Hartman 14682fd14964SGovindraj.R up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 14692fd14964SGovindraj.R up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 14702fd14964SGovindraj.R pm_qos_add_request(&up->pm_qos_request, 14712fd14964SGovindraj.R PM_QOS_CPU_DMA_LATENCY, up->latency); 14722fd14964SGovindraj.R serial_omap_uart_wq = create_singlethread_workqueue(up->name); 14732fd14964SGovindraj.R INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 14742fd14964SGovindraj.R 1475fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1476fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1477c86845dbSDeepak K omap_up_info->autosuspend_timeout); 1478fcdca757SGovindraj.R 1479fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1480fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1481fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1482fcdca757SGovindraj.R 1483ba77433dSRajendra Nayak ui[up->port.line] = up; 1484ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1485ab4382d2SGreg Kroah-Hartman 1486ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1487ab4382d2SGreg Kroah-Hartman if (ret != 0) 1488ab4382d2SGreg Kroah-Hartman goto do_release_region; 1489ab4382d2SGreg Kroah-Hartman 1490fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1491ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1492ab4382d2SGreg Kroah-Hartman return 0; 1493ab4382d2SGreg Kroah-Hartman err: 1494ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1495ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1496ab4382d2SGreg Kroah-Hartman do_release_region: 149728f65c11SJoe Perches release_mem_region(mem->start, resource_size(mem)); 1498ab4382d2SGreg Kroah-Hartman return ret; 1499ab4382d2SGreg Kroah-Hartman } 1500ab4382d2SGreg Kroah-Hartman 1501ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1502ab4382d2SGreg Kroah-Hartman { 1503ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1504ab4382d2SGreg Kroah-Hartman 1505ab4382d2SGreg Kroah-Hartman if (up) { 1506fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1507ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 15082fd14964SGovindraj.R pm_qos_remove_request(&up->pm_qos_request); 15092fd14964SGovindraj.R 1510ab4382d2SGreg Kroah-Hartman kfree(up); 1511ab4382d2SGreg Kroah-Hartman } 1512fcdca757SGovindraj.R 1513fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1514ab4382d2SGreg Kroah-Hartman return 0; 1515ab4382d2SGreg Kroah-Hartman } 1516ab4382d2SGreg Kroah-Hartman 151794734749SGovindraj.R /* 151894734749SGovindraj.R * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 151994734749SGovindraj.R * The access to uart register after MDR1 Access 152094734749SGovindraj.R * causes UART to corrupt data. 152194734749SGovindraj.R * 152294734749SGovindraj.R * Need a delay = 152394734749SGovindraj.R * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 152494734749SGovindraj.R * give 10 times as much 152594734749SGovindraj.R */ 152694734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 152794734749SGovindraj.R { 152894734749SGovindraj.R u8 timeout = 255; 152994734749SGovindraj.R 153094734749SGovindraj.R serial_out(up, UART_OMAP_MDR1, mdr1); 153194734749SGovindraj.R udelay(2); 153294734749SGovindraj.R serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 153394734749SGovindraj.R UART_FCR_CLEAR_RCVR); 153494734749SGovindraj.R /* 153594734749SGovindraj.R * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 153694734749SGovindraj.R * TX_FIFO_E bit is 1. 153794734749SGovindraj.R */ 153894734749SGovindraj.R while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 153994734749SGovindraj.R (UART_LSR_THRE | UART_LSR_DR))) { 154094734749SGovindraj.R timeout--; 154194734749SGovindraj.R if (!timeout) { 154294734749SGovindraj.R /* Should *never* happen. we warn and carry on */ 154394734749SGovindraj.R dev_crit(&up->pdev->dev, "Errata i202: timedout %x\n", 154494734749SGovindraj.R serial_in(up, UART_LSR)); 154594734749SGovindraj.R break; 154694734749SGovindraj.R } 154794734749SGovindraj.R udelay(1); 154894734749SGovindraj.R } 154994734749SGovindraj.R } 155094734749SGovindraj.R 1551b5148856SShubhrajyoti D #ifdef CONFIG_PM_RUNTIME 15529f9ac1e8SGovindraj.R static void serial_omap_restore_context(struct uart_omap_port *up) 15539f9ac1e8SGovindraj.R { 155494734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 155594734749SGovindraj.R serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 155694734749SGovindraj.R else 15579f9ac1e8SGovindraj.R serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 155894734749SGovindraj.R 15599f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 15609f9ac1e8SGovindraj.R serial_out(up, UART_EFR, UART_EFR_ECB); 15619f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 15629f9ac1e8SGovindraj.R serial_out(up, UART_IER, 0x0); 15639f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1564c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); 1565c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); 15669f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 15679f9ac1e8SGovindraj.R serial_out(up, UART_IER, up->ier); 15689f9ac1e8SGovindraj.R serial_out(up, UART_FCR, up->fcr); 15699f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 15709f9ac1e8SGovindraj.R serial_out(up, UART_MCR, up->mcr); 15719f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1572c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 15739f9ac1e8SGovindraj.R serial_out(up, UART_EFR, up->efr); 15749f9ac1e8SGovindraj.R serial_out(up, UART_LCR, up->lcr); 157594734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 157694734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 157794734749SGovindraj.R else 1578c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 15799f9ac1e8SGovindraj.R } 15809f9ac1e8SGovindraj.R 1581fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1582fcdca757SGovindraj.R { 1583ec3bebc6SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1584ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 1585ec3bebc6SGovindraj.R 1586ec3bebc6SGovindraj.R if (!up) 1587ec3bebc6SGovindraj.R return -EINVAL; 1588ec3bebc6SGovindraj.R 1589d92b0dfcSRajendra Nayak if (!pdata || !pdata->enable_wakeup) 159062f3ec5fSGovindraj.R return 0; 159162f3ec5fSGovindraj.R 1592ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) 1593ec3bebc6SGovindraj.R up->context_loss_cnt = pdata->get_context_loss_count(dev); 1594ec3bebc6SGovindraj.R 159562f3ec5fSGovindraj.R if (device_may_wakeup(dev)) { 159662f3ec5fSGovindraj.R if (!up->wakeups_enabled) { 159762f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, true); 159862f3ec5fSGovindraj.R up->wakeups_enabled = true; 159962f3ec5fSGovindraj.R } 160062f3ec5fSGovindraj.R } else { 160162f3ec5fSGovindraj.R if (up->wakeups_enabled) { 160262f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, false); 160362f3ec5fSGovindraj.R up->wakeups_enabled = false; 160462f3ec5fSGovindraj.R } 160562f3ec5fSGovindraj.R } 160662f3ec5fSGovindraj.R 160794734749SGovindraj.R /* Errata i291 */ 160894734749SGovindraj.R if (up->use_dma && pdata->set_forceidle && 160994734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 161094734749SGovindraj.R pdata->set_forceidle(up->pdev); 161194734749SGovindraj.R 16122fd14964SGovindraj.R up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 16132fd14964SGovindraj.R schedule_work(&up->qos_work); 16142fd14964SGovindraj.R 1615fcdca757SGovindraj.R return 0; 1616fcdca757SGovindraj.R } 1617fcdca757SGovindraj.R 1618fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1619fcdca757SGovindraj.R { 16209f9ac1e8SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1621ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 16229f9ac1e8SGovindraj.R 1623ec3bebc6SGovindraj.R if (up) { 1624ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) { 1625ec3bebc6SGovindraj.R u32 loss_cnt = pdata->get_context_loss_count(dev); 1626ec3bebc6SGovindraj.R 1627ec3bebc6SGovindraj.R if (up->context_loss_cnt != loss_cnt) 16289f9ac1e8SGovindraj.R serial_omap_restore_context(up); 1629ec3bebc6SGovindraj.R } 163094734749SGovindraj.R 163194734749SGovindraj.R /* Errata i291 */ 163294734749SGovindraj.R if (up->use_dma && pdata->set_noidle && 163394734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 163494734749SGovindraj.R pdata->set_noidle(up->pdev); 16352fd14964SGovindraj.R 16362fd14964SGovindraj.R up->latency = up->calc_latency; 16372fd14964SGovindraj.R schedule_work(&up->qos_work); 1638ec3bebc6SGovindraj.R } 16399f9ac1e8SGovindraj.R 1640fcdca757SGovindraj.R return 0; 1641fcdca757SGovindraj.R } 1642fcdca757SGovindraj.R #endif 1643fcdca757SGovindraj.R 1644fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1645fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1646fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1647fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1648fcdca757SGovindraj.R }; 1649fcdca757SGovindraj.R 1650d92b0dfcSRajendra Nayak #if defined(CONFIG_OF) 1651d92b0dfcSRajendra Nayak static const struct of_device_id omap_serial_of_match[] = { 1652d92b0dfcSRajendra Nayak { .compatible = "ti,omap2-uart" }, 1653d92b0dfcSRajendra Nayak { .compatible = "ti,omap3-uart" }, 1654d92b0dfcSRajendra Nayak { .compatible = "ti,omap4-uart" }, 1655d92b0dfcSRajendra Nayak {}, 1656d92b0dfcSRajendra Nayak }; 1657d92b0dfcSRajendra Nayak MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1658d92b0dfcSRajendra Nayak #endif 1659d92b0dfcSRajendra Nayak 1660ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1661ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1662ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1663ab4382d2SGreg Kroah-Hartman .driver = { 1664ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1665fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1666d92b0dfcSRajendra Nayak .of_match_table = of_match_ptr(omap_serial_of_match), 1667ab4382d2SGreg Kroah-Hartman }, 1668ab4382d2SGreg Kroah-Hartman }; 1669ab4382d2SGreg Kroah-Hartman 1670ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1671ab4382d2SGreg Kroah-Hartman { 1672ab4382d2SGreg Kroah-Hartman int ret; 1673ab4382d2SGreg Kroah-Hartman 1674ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1675ab4382d2SGreg Kroah-Hartman if (ret != 0) 1676ab4382d2SGreg Kroah-Hartman return ret; 1677ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1678ab4382d2SGreg Kroah-Hartman if (ret != 0) 1679ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1680ab4382d2SGreg Kroah-Hartman return ret; 1681ab4382d2SGreg Kroah-Hartman } 1682ab4382d2SGreg Kroah-Hartman 1683ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1684ab4382d2SGreg Kroah-Hartman { 1685ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1686ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1687ab4382d2SGreg Kroah-Hartman } 1688ab4382d2SGreg Kroah-Hartman 1689ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1690ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1691ab4382d2SGreg Kroah-Hartman 1692ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1693ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1694ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1695