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 477c77c8deSGovindraj.R #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) 487c77c8deSGovindraj.R 497c77c8deSGovindraj.R #define OMAP_UART_REV_42 0x0402 507c77c8deSGovindraj.R #define OMAP_UART_REV_46 0x0406 517c77c8deSGovindraj.R #define OMAP_UART_REV_52 0x0502 527c77c8deSGovindraj.R #define OMAP_UART_REV_63 0x0603 537c77c8deSGovindraj.R 548fe789dcSRajendra Nayak #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/ 558fe789dcSRajendra Nayak 560ba5f668SPaul Walmsley /* SCR register bitmasks */ 570ba5f668SPaul Walmsley #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) 580ba5f668SPaul Walmsley 590ba5f668SPaul Walmsley /* FCR register bitmasks */ 600ba5f668SPaul Walmsley #define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT 6 610ba5f668SPaul Walmsley #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) 620ba5f668SPaul Walmsley 637c77c8deSGovindraj.R /* MVR register bitmasks */ 647c77c8deSGovindraj.R #define OMAP_UART_MVR_SCHEME_SHIFT 30 657c77c8deSGovindraj.R 667c77c8deSGovindraj.R #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 677c77c8deSGovindraj.R #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 687c77c8deSGovindraj.R #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f 697c77c8deSGovindraj.R 707c77c8deSGovindraj.R #define OMAP_UART_MVR_MAJ_MASK 0x700 717c77c8deSGovindraj.R #define OMAP_UART_MVR_MAJ_SHIFT 8 727c77c8deSGovindraj.R #define OMAP_UART_MVR_MIN_MASK 0x3f 737c77c8deSGovindraj.R 74ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 75ab4382d2SGreg Kroah-Hartman 76ab4382d2SGreg Kroah-Hartman /* Forward declaration of functions */ 77ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data); 78a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no); 79ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up); 8094734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 81ab4382d2SGreg Kroah-Hartman 822fd14964SGovindraj.R static struct workqueue_struct *serial_omap_uart_wq; 83ab4382d2SGreg Kroah-Hartman 84ab4382d2SGreg Kroah-Hartman static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 85ab4382d2SGreg Kroah-Hartman { 86ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 87ab4382d2SGreg Kroah-Hartman return readw(up->port.membase + offset); 88ab4382d2SGreg Kroah-Hartman } 89ab4382d2SGreg Kroah-Hartman 90ab4382d2SGreg Kroah-Hartman static inline void serial_out(struct uart_omap_port *up, int offset, int value) 91ab4382d2SGreg Kroah-Hartman { 92ab4382d2SGreg Kroah-Hartman offset <<= up->port.regshift; 93ab4382d2SGreg Kroah-Hartman writew(value, up->port.membase + offset); 94ab4382d2SGreg Kroah-Hartman } 95ab4382d2SGreg Kroah-Hartman 96ab4382d2SGreg Kroah-Hartman static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 97ab4382d2SGreg Kroah-Hartman { 98ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 99ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 100ab4382d2SGreg Kroah-Hartman UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 101ab4382d2SGreg Kroah-Hartman serial_out(up, UART_FCR, 0); 102ab4382d2SGreg Kroah-Hartman } 103ab4382d2SGreg Kroah-Hartman 104ab4382d2SGreg Kroah-Hartman /* 105ab4382d2SGreg Kroah-Hartman * serial_omap_get_divisor - calculate divisor value 106ab4382d2SGreg Kroah-Hartman * @port: uart port info 107ab4382d2SGreg Kroah-Hartman * @baud: baudrate for which divisor needs to be calculated. 108ab4382d2SGreg Kroah-Hartman * 109ab4382d2SGreg Kroah-Hartman * We have written our own function to get the divisor so as to support 110ab4382d2SGreg Kroah-Hartman * 13x mode. 3Mbps Baudrate as an different divisor. 111ab4382d2SGreg Kroah-Hartman * Reference OMAP TRM Chapter 17: 112ab4382d2SGreg Kroah-Hartman * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates 113ab4382d2SGreg Kroah-Hartman * referring to oversampling - divisor value 114ab4382d2SGreg Kroah-Hartman * baudrate 460,800 to 3,686,400 all have divisor 13 115ab4382d2SGreg Kroah-Hartman * except 3,000,000 which has divisor value 16 116ab4382d2SGreg Kroah-Hartman */ 117ab4382d2SGreg Kroah-Hartman static unsigned int 118ab4382d2SGreg Kroah-Hartman serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 119ab4382d2SGreg Kroah-Hartman { 120ab4382d2SGreg Kroah-Hartman unsigned int divisor; 121ab4382d2SGreg Kroah-Hartman 122ab4382d2SGreg Kroah-Hartman if (baud > OMAP_MODE13X_SPEED && baud != 3000000) 123ab4382d2SGreg Kroah-Hartman divisor = 13; 124ab4382d2SGreg Kroah-Hartman else 125ab4382d2SGreg Kroah-Hartman divisor = 16; 126ab4382d2SGreg Kroah-Hartman return port->uartclk/(baud * divisor); 127ab4382d2SGreg Kroah-Hartman } 128ab4382d2SGreg Kroah-Hartman 129ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rxdma(struct uart_omap_port *up) 130ab4382d2SGreg Kroah-Hartman { 131ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_used) { 132ab4382d2SGreg Kroah-Hartman del_timer(&up->uart_dma.rx_timer); 133ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.rx_dma_channel); 134ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.rx_dma_channel); 135ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 136ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = false; 137fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 138fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 139ab4382d2SGreg Kroah-Hartman } 140ab4382d2SGreg Kroah-Hartman } 141ab4382d2SGreg Kroah-Hartman 142ab4382d2SGreg Kroah-Hartman static void serial_omap_enable_ms(struct uart_port *port) 143ab4382d2SGreg Kroah-Hartman { 144ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 145ab4382d2SGreg Kroah-Hartman 146ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 147fcdca757SGovindraj.R 148fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 149ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 150ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 151fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 152ab4382d2SGreg Kroah-Hartman } 153ab4382d2SGreg Kroah-Hartman 154ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_tx(struct uart_port *port) 155ab4382d2SGreg Kroah-Hartman { 156ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 157be4b0281SPaul Walmsley struct omap_uart_port_info *pdata = up->pdev->dev.platform_data; 158ab4382d2SGreg Kroah-Hartman 159ab4382d2SGreg Kroah-Hartman if (up->use_dma && 160ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { 161ab4382d2SGreg Kroah-Hartman /* 162ab4382d2SGreg Kroah-Hartman * Check if dma is still active. If yes do nothing, 163ab4382d2SGreg Kroah-Hartman * return. Else stop dma 164ab4382d2SGreg Kroah-Hartman */ 165ab4382d2SGreg Kroah-Hartman if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel)) 166ab4382d2SGreg Kroah-Hartman return; 167ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 168ab4382d2SGreg Kroah-Hartman omap_free_dma(up->uart_dma.tx_dma_channel); 169ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 170fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 171fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 172ab4382d2SGreg Kroah-Hartman } 173ab4382d2SGreg Kroah-Hartman 174fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 175ab4382d2SGreg Kroah-Hartman if (up->ier & UART_IER_THRI) { 176ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_THRI; 177ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 178ab4382d2SGreg Kroah-Hartman } 179fcdca757SGovindraj.R 180a5f43138SCousson, Benoit if (!up->use_dma && pdata && pdata->set_forceidle) 181be4b0281SPaul Walmsley pdata->set_forceidle(up->pdev); 182be4b0281SPaul Walmsley 183fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 184fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 185ab4382d2SGreg Kroah-Hartman } 186ab4382d2SGreg Kroah-Hartman 187ab4382d2SGreg Kroah-Hartman static void serial_omap_stop_rx(struct uart_port *port) 188ab4382d2SGreg Kroah-Hartman { 189ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 190ab4382d2SGreg Kroah-Hartman 191fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 192ab4382d2SGreg Kroah-Hartman if (up->use_dma) 193ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 194ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_RLSI; 195ab4382d2SGreg Kroah-Hartman up->port.read_status_mask &= ~UART_LSR_DR; 196ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 197fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 198fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 199ab4382d2SGreg Kroah-Hartman } 200ab4382d2SGreg Kroah-Hartman 201da274686SGovindraj.R static inline void receive_chars(struct uart_omap_port *up, 202da274686SGovindraj.R unsigned int *status) 203ab4382d2SGreg Kroah-Hartman { 204ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = up->port.state->port.tty; 205da274686SGovindraj.R unsigned int flag, lsr = *status; 206da274686SGovindraj.R unsigned char ch = 0; 207ab4382d2SGreg Kroah-Hartman int max_count = 256; 208ab4382d2SGreg Kroah-Hartman 209ab4382d2SGreg Kroah-Hartman do { 210ab4382d2SGreg Kroah-Hartman if (likely(lsr & UART_LSR_DR)) 211ab4382d2SGreg Kroah-Hartman ch = serial_in(up, UART_RX); 212ab4382d2SGreg Kroah-Hartman flag = TTY_NORMAL; 213ab4382d2SGreg Kroah-Hartman up->port.icount.rx++; 214ab4382d2SGreg Kroah-Hartman 215ab4382d2SGreg Kroah-Hartman if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 216ab4382d2SGreg Kroah-Hartman /* 217ab4382d2SGreg Kroah-Hartman * For statistics only 218ab4382d2SGreg Kroah-Hartman */ 219ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) { 220ab4382d2SGreg Kroah-Hartman lsr &= ~(UART_LSR_FE | UART_LSR_PE); 221ab4382d2SGreg Kroah-Hartman up->port.icount.brk++; 222ab4382d2SGreg Kroah-Hartman /* 223ab4382d2SGreg Kroah-Hartman * We do the SysRQ and SAK checking 224ab4382d2SGreg Kroah-Hartman * here because otherwise the break 225ab4382d2SGreg Kroah-Hartman * may get masked by ignore_status_mask 226ab4382d2SGreg Kroah-Hartman * or read_status_mask. 227ab4382d2SGreg Kroah-Hartman */ 228ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&up->port)) 229ab4382d2SGreg Kroah-Hartman goto ignore_char; 230ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_PE) { 231ab4382d2SGreg Kroah-Hartman up->port.icount.parity++; 232ab4382d2SGreg Kroah-Hartman } else if (lsr & UART_LSR_FE) { 233ab4382d2SGreg Kroah-Hartman up->port.icount.frame++; 234ab4382d2SGreg Kroah-Hartman } 235ab4382d2SGreg Kroah-Hartman 236ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_OE) 237ab4382d2SGreg Kroah-Hartman up->port.icount.overrun++; 238ab4382d2SGreg Kroah-Hartman 239ab4382d2SGreg Kroah-Hartman /* 240ab4382d2SGreg Kroah-Hartman * Mask off conditions which should be ignored. 241ab4382d2SGreg Kroah-Hartman */ 242ab4382d2SGreg Kroah-Hartman lsr &= up->port.read_status_mask; 243ab4382d2SGreg Kroah-Hartman 244ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 245ab4382d2SGreg Kroah-Hartman if (up->port.line == up->port.cons->index) { 246ab4382d2SGreg Kroah-Hartman /* Recover the break flag from console xmit */ 247ab4382d2SGreg Kroah-Hartman lsr |= up->lsr_break_flag; 248ab4382d2SGreg Kroah-Hartman } 249ab4382d2SGreg Kroah-Hartman #endif 250ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_BI) 251ab4382d2SGreg Kroah-Hartman flag = TTY_BREAK; 252ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_PE) 253ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 254ab4382d2SGreg Kroah-Hartman else if (lsr & UART_LSR_FE) 255ab4382d2SGreg Kroah-Hartman flag = TTY_FRAME; 256ab4382d2SGreg Kroah-Hartman } 257ab4382d2SGreg Kroah-Hartman 258ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&up->port, ch)) 259ab4382d2SGreg Kroah-Hartman goto ignore_char; 260ab4382d2SGreg Kroah-Hartman uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 261ab4382d2SGreg Kroah-Hartman ignore_char: 262ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 263ab4382d2SGreg Kroah-Hartman } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 264ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 265ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(tty); 266ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 267ab4382d2SGreg Kroah-Hartman } 268ab4382d2SGreg Kroah-Hartman 269ab4382d2SGreg Kroah-Hartman static void transmit_chars(struct uart_omap_port *up) 270ab4382d2SGreg Kroah-Hartman { 271ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 272ab4382d2SGreg Kroah-Hartman int count; 273ab4382d2SGreg Kroah-Hartman 274ab4382d2SGreg Kroah-Hartman if (up->port.x_char) { 275ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, up->port.x_char); 276ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 277ab4382d2SGreg Kroah-Hartman up->port.x_char = 0; 278ab4382d2SGreg Kroah-Hartman return; 279ab4382d2SGreg Kroah-Hartman } 280ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 281ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 282ab4382d2SGreg Kroah-Hartman return; 283ab4382d2SGreg Kroah-Hartman } 284af681cadSGreg Kroah-Hartman count = up->port.fifosize / 4; 285ab4382d2SGreg Kroah-Hartman do { 286ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, xmit->buf[xmit->tail]); 287ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 288ab4382d2SGreg Kroah-Hartman up->port.icount.tx++; 289ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 290ab4382d2SGreg Kroah-Hartman break; 291ab4382d2SGreg Kroah-Hartman } while (--count > 0); 292ab4382d2SGreg Kroah-Hartman 293ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 294ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 295ab4382d2SGreg Kroah-Hartman 296ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 297ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 298ab4382d2SGreg Kroah-Hartman } 299ab4382d2SGreg Kroah-Hartman 300ab4382d2SGreg Kroah-Hartman static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 301ab4382d2SGreg Kroah-Hartman { 302ab4382d2SGreg Kroah-Hartman if (!(up->ier & UART_IER_THRI)) { 303ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_THRI; 304ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 305ab4382d2SGreg Kroah-Hartman } 306ab4382d2SGreg Kroah-Hartman } 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman static void serial_omap_start_tx(struct uart_port *port) 309ab4382d2SGreg Kroah-Hartman { 310ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 311be4b0281SPaul Walmsley struct omap_uart_port_info *pdata = up->pdev->dev.platform_data; 312ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit; 313ab4382d2SGreg Kroah-Hartman unsigned int start; 314ab4382d2SGreg Kroah-Hartman int ret = 0; 315ab4382d2SGreg Kroah-Hartman 316ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 317fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 318ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 319a5f43138SCousson, Benoit if (pdata && pdata->set_noidle) 320be4b0281SPaul Walmsley pdata->set_noidle(up->pdev); 321fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 322fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 323ab4382d2SGreg Kroah-Hartman return; 324ab4382d2SGreg Kroah-Hartman } 325ab4382d2SGreg Kroah-Hartman 326ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_used) 327ab4382d2SGreg Kroah-Hartman return; 328ab4382d2SGreg Kroah-Hartman 329ab4382d2SGreg Kroah-Hartman xmit = &up->port.state->xmit; 330ab4382d2SGreg Kroah-Hartman 331ab4382d2SGreg Kroah-Hartman if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) { 332fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 333ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_tx, 334ab4382d2SGreg Kroah-Hartman "UART Tx DMA", 335ab4382d2SGreg Kroah-Hartman (void *)uart_tx_dma_callback, up, 336ab4382d2SGreg Kroah-Hartman &(up->uart_dma.tx_dma_channel)); 337ab4382d2SGreg Kroah-Hartman 338ab4382d2SGreg Kroah-Hartman if (ret < 0) { 339ab4382d2SGreg Kroah-Hartman serial_omap_enable_ier_thri(up); 340ab4382d2SGreg Kroah-Hartman return; 341ab4382d2SGreg Kroah-Hartman } 342ab4382d2SGreg Kroah-Hartman } 343ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 344ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = true; 345ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 346ab4382d2SGreg Kroah-Hartman 347ab4382d2SGreg Kroah-Hartman start = up->uart_dma.tx_buf_dma_phys + 348ab4382d2SGreg Kroah-Hartman (xmit->tail & (UART_XMIT_SIZE - 1)); 349ab4382d2SGreg Kroah-Hartman 350ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 351ab4382d2SGreg Kroah-Hartman /* 352ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 353ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 354ab4382d2SGreg Kroah-Hartman * transfers 355ab4382d2SGreg Kroah-Hartman */ 356ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 357ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 358ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 359ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + 360ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE) - start; 361ab4382d2SGreg Kroah-Hartman 362ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 363ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 364ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 365ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 366ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 367ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 368ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 369ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 370ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 371ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 372ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 373ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 374ab4382d2SGreg Kroah-Hartman } 375ab4382d2SGreg Kroah-Hartman 376ab4382d2SGreg Kroah-Hartman static unsigned int check_modem_status(struct uart_omap_port *up) 377ab4382d2SGreg Kroah-Hartman { 378ab4382d2SGreg Kroah-Hartman unsigned int status; 379ab4382d2SGreg Kroah-Hartman 380ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_MSR); 381ab4382d2SGreg Kroah-Hartman status |= up->msr_saved_flags; 382ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 383ab4382d2SGreg Kroah-Hartman if ((status & UART_MSR_ANY_DELTA) == 0) 384ab4382d2SGreg Kroah-Hartman return status; 385ab4382d2SGreg Kroah-Hartman 386ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 387ab4382d2SGreg Kroah-Hartman up->port.state != NULL) { 388ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_TERI) 389ab4382d2SGreg Kroah-Hartman up->port.icount.rng++; 390ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDSR) 391ab4382d2SGreg Kroah-Hartman up->port.icount.dsr++; 392ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DDCD) 393ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change 394ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_DCD); 395ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCTS) 396ab4382d2SGreg Kroah-Hartman uart_handle_cts_change 397ab4382d2SGreg Kroah-Hartman (&up->port, status & UART_MSR_CTS); 398ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&up->port.state->port.delta_msr_wait); 399ab4382d2SGreg Kroah-Hartman } 400ab4382d2SGreg Kroah-Hartman 401ab4382d2SGreg Kroah-Hartman return status; 402ab4382d2SGreg Kroah-Hartman } 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman /** 405ab4382d2SGreg Kroah-Hartman * serial_omap_irq() - This handles the interrupt from one port 406ab4382d2SGreg Kroah-Hartman * @irq: uart port irq number 407ab4382d2SGreg Kroah-Hartman * @dev_id: uart port info 408ab4382d2SGreg Kroah-Hartman */ 409ab4382d2SGreg Kroah-Hartman static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) 410ab4382d2SGreg Kroah-Hartman { 411ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = dev_id; 412ab4382d2SGreg Kroah-Hartman unsigned int iir, lsr; 413ab4382d2SGreg Kroah-Hartman unsigned long flags; 414ab4382d2SGreg Kroah-Hartman 415fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 416ab4382d2SGreg Kroah-Hartman iir = serial_in(up, UART_IIR); 417fcdca757SGovindraj.R if (iir & UART_IIR_NO_INT) { 418fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 419fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 420ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 421fcdca757SGovindraj.R } 422ab4382d2SGreg Kroah-Hartman 423ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 424ab4382d2SGreg Kroah-Hartman lsr = serial_in(up, UART_LSR); 425ab4382d2SGreg Kroah-Hartman if (iir & UART_IIR_RLSI) { 426ab4382d2SGreg Kroah-Hartman if (!up->use_dma) { 427ab4382d2SGreg Kroah-Hartman if (lsr & UART_LSR_DR) 428ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 429ab4382d2SGreg Kroah-Hartman } else { 430ab4382d2SGreg Kroah-Hartman up->ier &= ~(UART_IER_RDI | UART_IER_RLSI); 431ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 432ab4382d2SGreg Kroah-Hartman if ((serial_omap_start_rxdma(up) != 0) && 433ab4382d2SGreg Kroah-Hartman (lsr & UART_LSR_DR)) 434ab4382d2SGreg Kroah-Hartman receive_chars(up, &lsr); 435ab4382d2SGreg Kroah-Hartman } 436ab4382d2SGreg Kroah-Hartman } 437ab4382d2SGreg Kroah-Hartman 438ab4382d2SGreg Kroah-Hartman check_modem_status(up); 439ab4382d2SGreg Kroah-Hartman if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) 440ab4382d2SGreg Kroah-Hartman transmit_chars(up); 441ab4382d2SGreg Kroah-Hartman 442ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 443fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 444fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 445fcdca757SGovindraj.R 446ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 447ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 448ab4382d2SGreg Kroah-Hartman } 449ab4382d2SGreg Kroah-Hartman 450ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_tx_empty(struct uart_port *port) 451ab4382d2SGreg Kroah-Hartman { 452ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 453ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 454ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 455ab4382d2SGreg Kroah-Hartman 456fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 457ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 458ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 459ab4382d2SGreg Kroah-Hartman ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 460ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 461fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 462ab4382d2SGreg Kroah-Hartman return ret; 463ab4382d2SGreg Kroah-Hartman } 464ab4382d2SGreg Kroah-Hartman 465ab4382d2SGreg Kroah-Hartman static unsigned int serial_omap_get_mctrl(struct uart_port *port) 466ab4382d2SGreg Kroah-Hartman { 467ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 468514f31d1SShubhrajyoti D unsigned int status; 469ab4382d2SGreg Kroah-Hartman unsigned int ret = 0; 470ab4382d2SGreg Kroah-Hartman 471fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 472ab4382d2SGreg Kroah-Hartman status = check_modem_status(up); 473fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 474fcdca757SGovindraj.R 475ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 476ab4382d2SGreg Kroah-Hartman 477ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DCD) 478ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CAR; 479ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_RI) 480ab4382d2SGreg Kroah-Hartman ret |= TIOCM_RNG; 481ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_DSR) 482ab4382d2SGreg Kroah-Hartman ret |= TIOCM_DSR; 483ab4382d2SGreg Kroah-Hartman if (status & UART_MSR_CTS) 484ab4382d2SGreg Kroah-Hartman ret |= TIOCM_CTS; 485ab4382d2SGreg Kroah-Hartman return ret; 486ab4382d2SGreg Kroah-Hartman } 487ab4382d2SGreg Kroah-Hartman 488ab4382d2SGreg Kroah-Hartman static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 489ab4382d2SGreg Kroah-Hartman { 490ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 491ab4382d2SGreg Kroah-Hartman unsigned char mcr = 0; 492ab4382d2SGreg Kroah-Hartman 493ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 494ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 495ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_RTS; 496ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_DTR) 497ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_DTR; 498ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT1) 499ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT1; 500ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_OUT2) 501ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_OUT2; 502ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_LOOP) 503ab4382d2SGreg Kroah-Hartman mcr |= UART_MCR_LOOP; 504ab4382d2SGreg Kroah-Hartman 505fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 506c538d20cSGovindraj.R up->mcr = serial_in(up, UART_MCR); 507c538d20cSGovindraj.R up->mcr |= mcr; 508c538d20cSGovindraj.R serial_out(up, UART_MCR, up->mcr); 509fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 510ab4382d2SGreg Kroah-Hartman } 511ab4382d2SGreg Kroah-Hartman 512ab4382d2SGreg Kroah-Hartman static void serial_omap_break_ctl(struct uart_port *port, int break_state) 513ab4382d2SGreg Kroah-Hartman { 514ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 515ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 516ab4382d2SGreg Kroah-Hartman 517ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 518fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 519ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 520ab4382d2SGreg Kroah-Hartman if (break_state == -1) 521ab4382d2SGreg Kroah-Hartman up->lcr |= UART_LCR_SBC; 522ab4382d2SGreg Kroah-Hartman else 523ab4382d2SGreg Kroah-Hartman up->lcr &= ~UART_LCR_SBC; 524ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 525ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 526fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 527ab4382d2SGreg Kroah-Hartman } 528ab4382d2SGreg Kroah-Hartman 529ab4382d2SGreg Kroah-Hartman static int serial_omap_startup(struct uart_port *port) 530ab4382d2SGreg Kroah-Hartman { 531ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 532ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 533ab4382d2SGreg Kroah-Hartman int retval; 534ab4382d2SGreg Kroah-Hartman 535ab4382d2SGreg Kroah-Hartman /* 536ab4382d2SGreg Kroah-Hartman * Allocate the IRQ 537ab4382d2SGreg Kroah-Hartman */ 538ab4382d2SGreg Kroah-Hartman retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 539ab4382d2SGreg Kroah-Hartman up->name, up); 540ab4382d2SGreg Kroah-Hartman if (retval) 541ab4382d2SGreg Kroah-Hartman return retval; 542ab4382d2SGreg Kroah-Hartman 543ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 544ab4382d2SGreg Kroah-Hartman 545fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 546ab4382d2SGreg Kroah-Hartman /* 547ab4382d2SGreg Kroah-Hartman * Clear the FIFO buffers and disable them. 548ab4382d2SGreg Kroah-Hartman * (they will be reenabled in set_termios()) 549ab4382d2SGreg Kroah-Hartman */ 550ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 551ab4382d2SGreg Kroah-Hartman /* For Hardware flow control */ 552ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, UART_MCR_RTS); 553ab4382d2SGreg Kroah-Hartman 554ab4382d2SGreg Kroah-Hartman /* 555ab4382d2SGreg Kroah-Hartman * Clear the interrupt registers. 556ab4382d2SGreg Kroah-Hartman */ 557ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_LSR); 558ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 559ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 560ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_IIR); 561ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_MSR); 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman /* 564ab4382d2SGreg Kroah-Hartman * Now, initialize the UART 565ab4382d2SGreg Kroah-Hartman */ 566ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_WLEN8); 567ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 568ab4382d2SGreg Kroah-Hartman /* 569ab4382d2SGreg Kroah-Hartman * Most PC uarts need OUT2 raised to enable interrupts. 570ab4382d2SGreg Kroah-Hartman */ 571ab4382d2SGreg Kroah-Hartman up->port.mctrl |= TIOCM_OUT2; 572ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 573ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 574ab4382d2SGreg Kroah-Hartman 575ab4382d2SGreg Kroah-Hartman up->msr_saved_flags = 0; 576ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 577ab4382d2SGreg Kroah-Hartman free_page((unsigned long)up->port.state->xmit.buf); 578ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = dma_alloc_coherent(NULL, 579ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, 580ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 581ab4382d2SGreg Kroah-Hartman 0); 582ab4382d2SGreg Kroah-Hartman init_timer(&(up->uart_dma.rx_timer)); 583a9e210e0SJon Hunter up->uart_dma.rx_timer.function = serial_omap_rxdma_poll; 584ba77433dSRajendra Nayak up->uart_dma.rx_timer.data = up->port.line; 585ab4382d2SGreg Kroah-Hartman /* Currently the buffer size is 4KB. Can increase it */ 586ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = dma_alloc_coherent(NULL, 587ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 588ab4382d2SGreg Kroah-Hartman (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0); 589ab4382d2SGreg Kroah-Hartman } 590ab4382d2SGreg Kroah-Hartman /* 591ab4382d2SGreg Kroah-Hartman * Finally, enable interrupts. Note: Modem status interrupts 592ab4382d2SGreg Kroah-Hartman * are set via set_termios(), which will be occurring imminently 593ab4382d2SGreg Kroah-Hartman * anyway, so we don't enable them here. 594ab4382d2SGreg Kroah-Hartman */ 595ab4382d2SGreg Kroah-Hartman up->ier = UART_IER_RLSI | UART_IER_RDI; 596ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 597ab4382d2SGreg Kroah-Hartman 59878841462SJarkko Nikula /* Enable module level wake up */ 59978841462SJarkko Nikula serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); 60078841462SJarkko Nikula 601fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 602fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 603ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 604ab4382d2SGreg Kroah-Hartman return 0; 605ab4382d2SGreg Kroah-Hartman } 606ab4382d2SGreg Kroah-Hartman 607ab4382d2SGreg Kroah-Hartman static void serial_omap_shutdown(struct uart_port *port) 608ab4382d2SGreg Kroah-Hartman { 609ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 610ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 611ab4382d2SGreg Kroah-Hartman 612ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); 613fcdca757SGovindraj.R 614fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 615ab4382d2SGreg Kroah-Hartman /* 616ab4382d2SGreg Kroah-Hartman * Disable interrupts from this port 617ab4382d2SGreg Kroah-Hartman */ 618ab4382d2SGreg Kroah-Hartman up->ier = 0; 619ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 620ab4382d2SGreg Kroah-Hartman 621ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 622ab4382d2SGreg Kroah-Hartman up->port.mctrl &= ~TIOCM_OUT2; 623ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 624ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 625ab4382d2SGreg Kroah-Hartman 626ab4382d2SGreg Kroah-Hartman /* 627ab4382d2SGreg Kroah-Hartman * Disable break condition and FIFOs 628ab4382d2SGreg Kroah-Hartman */ 629ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 630ab4382d2SGreg Kroah-Hartman serial_omap_clear_fifos(up); 631ab4382d2SGreg Kroah-Hartman 632ab4382d2SGreg Kroah-Hartman /* 633ab4382d2SGreg Kroah-Hartman * Read data port to reset things, and then free the irq 634ab4382d2SGreg Kroah-Hartman */ 635ab4382d2SGreg Kroah-Hartman if (serial_in(up, UART_LSR) & UART_LSR_DR) 636ab4382d2SGreg Kroah-Hartman (void) serial_in(up, UART_RX); 637ab4382d2SGreg Kroah-Hartman if (up->use_dma) { 638ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 639ab4382d2SGreg Kroah-Hartman UART_XMIT_SIZE, up->port.state->xmit.buf, 640ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys); 641ab4382d2SGreg Kroah-Hartman up->port.state->xmit.buf = NULL; 642ab4382d2SGreg Kroah-Hartman serial_omap_stop_rx(port); 643ab4382d2SGreg Kroah-Hartman dma_free_coherent(up->port.dev, 644ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, up->uart_dma.rx_buf, 645ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys); 646ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf = NULL; 647ab4382d2SGreg Kroah-Hartman } 648fcdca757SGovindraj.R 649fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 650ab4382d2SGreg Kroah-Hartman free_irq(up->port.irq, up); 651ab4382d2SGreg Kroah-Hartman } 652ab4382d2SGreg Kroah-Hartman 653ab4382d2SGreg Kroah-Hartman static inline void 654ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff 655ab4382d2SGreg Kroah-Hartman (struct uart_omap_port *up, struct ktermios *termios) 656ab4382d2SGreg Kroah-Hartman { 657ab4382d2SGreg Kroah-Hartman up->lcr = serial_in(up, UART_LCR); 658ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 659ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 660ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); 661ab4382d2SGreg Kroah-Hartman 662ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XON1, termios->c_cc[VSTART]); 663ab4382d2SGreg Kroah-Hartman serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 664ab4382d2SGreg Kroah-Hartman 665ab4382d2SGreg Kroah-Hartman /* clear SW control mode bits */ 666c538d20cSGovindraj.R up->efr &= OMAP_UART_SW_CLR; 667ab4382d2SGreg Kroah-Hartman 668ab4382d2SGreg Kroah-Hartman /* 669ab4382d2SGreg Kroah-Hartman * IXON Flag: 670ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on output. 671ab4382d2SGreg Kroah-Hartman * Transmit XON1, XOFF1 672ab4382d2SGreg Kroah-Hartman */ 673ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXON) 674c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_TX; 675ab4382d2SGreg Kroah-Hartman 676ab4382d2SGreg Kroah-Hartman /* 677ab4382d2SGreg Kroah-Hartman * IXOFF Flag: 678ab4382d2SGreg Kroah-Hartman * Enable XON/XOFF flow control on input. 679ab4382d2SGreg Kroah-Hartman * Receiver compares XON1, XOFF1. 680ab4382d2SGreg Kroah-Hartman */ 681ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXOFF) 682c538d20cSGovindraj.R up->efr |= OMAP_UART_SW_RX; 683ab4382d2SGreg Kroah-Hartman 684ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 685ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 686ab4382d2SGreg Kroah-Hartman 687ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 688ab4382d2SGreg Kroah-Hartman 689ab4382d2SGreg Kroah-Hartman /* 690ab4382d2SGreg Kroah-Hartman * IXANY Flag: 691ab4382d2SGreg Kroah-Hartman * Enable any character to restart output. 692ab4382d2SGreg Kroah-Hartman * Operation resumes after receiving any 693ab4382d2SGreg Kroah-Hartman * character after recognition of the XOFF character 694ab4382d2SGreg Kroah-Hartman */ 695ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IXANY) 696ab4382d2SGreg Kroah-Hartman up->mcr |= UART_MCR_XONANY; 697ab4382d2SGreg Kroah-Hartman 698ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 699ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 700ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 701ab4382d2SGreg Kroah-Hartman /* Enable special char function UARTi.EFR_REG[5] and 702ab4382d2SGreg Kroah-Hartman * load the new software flow control mode IXON or IXOFF 703ab4382d2SGreg Kroah-Hartman * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. 704ab4382d2SGreg Kroah-Hartman */ 705c538d20cSGovindraj.R serial_out(up, UART_EFR, up->efr | UART_EFR_SCD); 706ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 707ab4382d2SGreg Kroah-Hartman 708ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); 709ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, up->lcr); 710ab4382d2SGreg Kroah-Hartman } 711ab4382d2SGreg Kroah-Hartman 7122fd14964SGovindraj.R static void serial_omap_uart_qos_work(struct work_struct *work) 7132fd14964SGovindraj.R { 7142fd14964SGovindraj.R struct uart_omap_port *up = container_of(work, struct uart_omap_port, 7152fd14964SGovindraj.R qos_work); 7162fd14964SGovindraj.R 7172fd14964SGovindraj.R pm_qos_update_request(&up->pm_qos_request, up->latency); 7182fd14964SGovindraj.R } 7192fd14964SGovindraj.R 720ab4382d2SGreg Kroah-Hartman static void 721ab4382d2SGreg Kroah-Hartman serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 722ab4382d2SGreg Kroah-Hartman struct ktermios *old) 723ab4382d2SGreg Kroah-Hartman { 724ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 725ab4382d2SGreg Kroah-Hartman unsigned char cval = 0; 726ab4382d2SGreg Kroah-Hartman unsigned char efr = 0; 727ab4382d2SGreg Kroah-Hartman unsigned long flags = 0; 728ab4382d2SGreg Kroah-Hartman unsigned int baud, quot; 729ab4382d2SGreg Kroah-Hartman 730ab4382d2SGreg Kroah-Hartman switch (termios->c_cflag & CSIZE) { 731ab4382d2SGreg Kroah-Hartman case CS5: 732ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN5; 733ab4382d2SGreg Kroah-Hartman break; 734ab4382d2SGreg Kroah-Hartman case CS6: 735ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN6; 736ab4382d2SGreg Kroah-Hartman break; 737ab4382d2SGreg Kroah-Hartman case CS7: 738ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN7; 739ab4382d2SGreg Kroah-Hartman break; 740ab4382d2SGreg Kroah-Hartman default: 741ab4382d2SGreg Kroah-Hartman case CS8: 742ab4382d2SGreg Kroah-Hartman cval = UART_LCR_WLEN8; 743ab4382d2SGreg Kroah-Hartman break; 744ab4382d2SGreg Kroah-Hartman } 745ab4382d2SGreg Kroah-Hartman 746ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 747ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_STOP; 748ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) 749ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_PARITY; 750ab4382d2SGreg Kroah-Hartman if (!(termios->c_cflag & PARODD)) 751ab4382d2SGreg Kroah-Hartman cval |= UART_LCR_EPAR; 752ab4382d2SGreg Kroah-Hartman 753ab4382d2SGreg Kroah-Hartman /* 754ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 755ab4382d2SGreg Kroah-Hartman */ 756ab4382d2SGreg Kroah-Hartman 757ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 758ab4382d2SGreg Kroah-Hartman quot = serial_omap_get_divisor(port, baud); 759ab4382d2SGreg Kroah-Hartman 7602fd14964SGovindraj.R /* calculate wakeup latency constraint */ 76119723452SPaul Walmsley up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8); 7622fd14964SGovindraj.R up->latency = up->calc_latency; 7632fd14964SGovindraj.R schedule_work(&up->qos_work); 7642fd14964SGovindraj.R 765c538d20cSGovindraj.R up->dll = quot & 0xff; 766c538d20cSGovindraj.R up->dlh = quot >> 8; 767c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_DISABLE; 768c538d20cSGovindraj.R 769ab4382d2SGreg Kroah-Hartman up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 770ab4382d2SGreg Kroah-Hartman UART_FCR_ENABLE_FIFO; 771ab4382d2SGreg Kroah-Hartman if (up->use_dma) 772ab4382d2SGreg Kroah-Hartman up->fcr |= UART_FCR_DMA_SELECT; 773ab4382d2SGreg Kroah-Hartman 774ab4382d2SGreg Kroah-Hartman /* 775ab4382d2SGreg Kroah-Hartman * Ok, we're now changing the port state. Do it with 776ab4382d2SGreg Kroah-Hartman * interrupts disabled. 777ab4382d2SGreg Kroah-Hartman */ 778fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 779ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&up->port.lock, flags); 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman /* 782ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 783ab4382d2SGreg Kroah-Hartman */ 784ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 785ab4382d2SGreg Kroah-Hartman 786ab4382d2SGreg Kroah-Hartman up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 787ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 788ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 789ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 790ab4382d2SGreg Kroah-Hartman up->port.read_status_mask |= UART_LSR_BI; 791ab4382d2SGreg Kroah-Hartman 792ab4382d2SGreg Kroah-Hartman /* 793ab4382d2SGreg Kroah-Hartman * Characters to ignore 794ab4382d2SGreg Kroah-Hartman */ 795ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask = 0; 796ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 797ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 798ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 799ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_BI; 800ab4382d2SGreg Kroah-Hartman /* 801ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 802ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 803ab4382d2SGreg Kroah-Hartman */ 804ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 805ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_OE; 806ab4382d2SGreg Kroah-Hartman } 807ab4382d2SGreg Kroah-Hartman 808ab4382d2SGreg Kroah-Hartman /* 809ab4382d2SGreg Kroah-Hartman * ignore all characters if CREAD is not set 810ab4382d2SGreg Kroah-Hartman */ 811ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 812ab4382d2SGreg Kroah-Hartman up->port.ignore_status_mask |= UART_LSR_DR; 813ab4382d2SGreg Kroah-Hartman 814ab4382d2SGreg Kroah-Hartman /* 815ab4382d2SGreg Kroah-Hartman * Modem status interrupts 816ab4382d2SGreg Kroah-Hartman */ 817ab4382d2SGreg Kroah-Hartman up->ier &= ~UART_IER_MSI; 818ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 819ab4382d2SGreg Kroah-Hartman up->ier |= UART_IER_MSI; 820ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 821ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); /* reset DLAB */ 822c538d20cSGovindraj.R up->lcr = cval; 82332212897SGovindraj.R up->scr = OMAP_UART_SCR_TX_EMPTY; 824ab4382d2SGreg Kroah-Hartman 825ab4382d2SGreg Kroah-Hartman /* FIFOs and DMA Settings */ 826ab4382d2SGreg Kroah-Hartman 827ab4382d2SGreg Kroah-Hartman /* FCR can be changed only when the 828ab4382d2SGreg Kroah-Hartman * baud clock is not running 829ab4382d2SGreg Kroah-Hartman * DLL_REG and DLH_REG set to 0. 830ab4382d2SGreg Kroah-Hartman */ 831ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 832ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLL, 0); 833ab4382d2SGreg Kroah-Hartman serial_out(up, UART_DLM, 0); 834ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 835ab4382d2SGreg Kroah-Hartman 836ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 837ab4382d2SGreg Kroah-Hartman 838ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 839ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 840ab4382d2SGreg Kroah-Hartman 841ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 842ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 843ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 844ab4382d2SGreg Kroah-Hartman /* FIFO ENABLE, DMA MODE */ 8450ba5f668SPaul Walmsley 8460ba5f668SPaul Walmsley up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 8470a697b22SPaul Walmsley 8488a74e9ffSGreg Kroah-Hartman if (up->use_dma) { 8498a74e9ffSGreg Kroah-Hartman serial_out(up, UART_TI752_TLR, 0); 8500ba5f668SPaul Walmsley up->scr |= UART_FCR_TRIGGER_4; 8510ba5f668SPaul Walmsley } else { 8520ba5f668SPaul Walmsley /* Set receive FIFO threshold to 1 byte */ 8530ba5f668SPaul Walmsley up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 8540ba5f668SPaul Walmsley up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT); 8558a74e9ffSGreg Kroah-Hartman } 8568a74e9ffSGreg Kroah-Hartman 8570ba5f668SPaul Walmsley serial_out(up, UART_FCR, up->fcr); 8580ba5f668SPaul Walmsley serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 8590ba5f668SPaul Walmsley 860c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 861c538d20cSGovindraj.R 862ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 863ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 864ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr); 865ab4382d2SGreg Kroah-Hartman 866ab4382d2SGreg Kroah-Hartman /* Protocol, Baud Rate, and Interrupt Settings */ 867ab4382d2SGreg Kroah-Hartman 86894734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 86994734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 87094734749SGovindraj.R else 871c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 87294734749SGovindraj.R 873ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 874ab4382d2SGreg Kroah-Hartman 875ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 876ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 877ab4382d2SGreg Kroah-Hartman 878ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 879ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 880ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 881ab4382d2SGreg Kroah-Hartman 882c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 883c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 884ab4382d2SGreg Kroah-Hartman 885ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 886ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 887ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 888ab4382d2SGreg Kroah-Hartman 889ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr); 890ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 891ab4382d2SGreg Kroah-Hartman 892ab4382d2SGreg Kroah-Hartman if (baud > 230400 && baud != 3000000) 893c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_13X_MODE; 894ab4382d2SGreg Kroah-Hartman else 895c538d20cSGovindraj.R up->mdr1 = UART_OMAP_MDR1_16X_MODE; 896c538d20cSGovindraj.R 89794734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 89894734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 89994734749SGovindraj.R else 900c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 901ab4382d2SGreg Kroah-Hartman 902ab4382d2SGreg Kroah-Hartman /* Hardware Flow Control Configuration */ 903ab4382d2SGreg Kroah-Hartman 904ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 905ab4382d2SGreg Kroah-Hartman efr |= (UART_EFR_CTS | UART_EFR_RTS); 906ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 907ab4382d2SGreg Kroah-Hartman 908ab4382d2SGreg Kroah-Hartman up->mcr = serial_in(up, UART_MCR); 909ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 910ab4382d2SGreg Kroah-Hartman 911ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 912ab4382d2SGreg Kroah-Hartman up->efr = serial_in(up, UART_EFR); 913ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 914ab4382d2SGreg Kroah-Hartman 915ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 916ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ 917ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 918ab4382d2SGreg Kroah-Hartman serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); 919ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, cval); 920ab4382d2SGreg Kroah-Hartman } 921ab4382d2SGreg Kroah-Hartman 922ab4382d2SGreg Kroah-Hartman serial_omap_set_mctrl(&up->port, up->port.mctrl); 923ab4382d2SGreg Kroah-Hartman /* Software Flow Control Configuration */ 924ab4382d2SGreg Kroah-Hartman serial_omap_configure_xonxoff(up, termios); 925ab4382d2SGreg Kroah-Hartman 926ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&up->port.lock, flags); 927fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 928ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 929ab4382d2SGreg Kroah-Hartman } 930ab4382d2SGreg Kroah-Hartman 931ab4382d2SGreg Kroah-Hartman static void 932ab4382d2SGreg Kroah-Hartman serial_omap_pm(struct uart_port *port, unsigned int state, 933ab4382d2SGreg Kroah-Hartman unsigned int oldstate) 934ab4382d2SGreg Kroah-Hartman { 935ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 936ab4382d2SGreg Kroah-Hartman unsigned char efr; 937ab4382d2SGreg Kroah-Hartman 938ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 939fcdca757SGovindraj.R 940fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 941ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 942ab4382d2SGreg Kroah-Hartman efr = serial_in(up, UART_EFR); 943ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr | UART_EFR_ECB); 944ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 945ab4382d2SGreg Kroah-Hartman 946ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 947ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 948ab4382d2SGreg Kroah-Hartman serial_out(up, UART_EFR, efr); 949ab4382d2SGreg Kroah-Hartman serial_out(up, UART_LCR, 0); 950fcdca757SGovindraj.R 951fcdca757SGovindraj.R if (!device_may_wakeup(&up->pdev->dev)) { 952fcdca757SGovindraj.R if (!state) 953fcdca757SGovindraj.R pm_runtime_forbid(&up->pdev->dev); 954fcdca757SGovindraj.R else 955fcdca757SGovindraj.R pm_runtime_allow(&up->pdev->dev); 956fcdca757SGovindraj.R } 957fcdca757SGovindraj.R 958fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 959ab4382d2SGreg Kroah-Hartman } 960ab4382d2SGreg Kroah-Hartman 961ab4382d2SGreg Kroah-Hartman static void serial_omap_release_port(struct uart_port *port) 962ab4382d2SGreg Kroah-Hartman { 963ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_release_port+\n"); 964ab4382d2SGreg Kroah-Hartman } 965ab4382d2SGreg Kroah-Hartman 966ab4382d2SGreg Kroah-Hartman static int serial_omap_request_port(struct uart_port *port) 967ab4382d2SGreg Kroah-Hartman { 968ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_request_port+\n"); 969ab4382d2SGreg Kroah-Hartman return 0; 970ab4382d2SGreg Kroah-Hartman } 971ab4382d2SGreg Kroah-Hartman 972ab4382d2SGreg Kroah-Hartman static void serial_omap_config_port(struct uart_port *port, int flags) 973ab4382d2SGreg Kroah-Hartman { 974ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 975ab4382d2SGreg Kroah-Hartman 976ab4382d2SGreg Kroah-Hartman dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 977ba77433dSRajendra Nayak up->port.line); 978ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 979ab4382d2SGreg Kroah-Hartman } 980ab4382d2SGreg Kroah-Hartman 981ab4382d2SGreg Kroah-Hartman static int 982ab4382d2SGreg Kroah-Hartman serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 983ab4382d2SGreg Kroah-Hartman { 984ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 985ab4382d2SGreg Kroah-Hartman dev_dbg(port->dev, "serial_omap_verify_port+\n"); 986ab4382d2SGreg Kroah-Hartman return -EINVAL; 987ab4382d2SGreg Kroah-Hartman } 988ab4382d2SGreg Kroah-Hartman 989ab4382d2SGreg Kroah-Hartman static const char * 990ab4382d2SGreg Kroah-Hartman serial_omap_type(struct uart_port *port) 991ab4382d2SGreg Kroah-Hartman { 992ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 993ab4382d2SGreg Kroah-Hartman 994ba77433dSRajendra Nayak dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 995ab4382d2SGreg Kroah-Hartman return up->name; 996ab4382d2SGreg Kroah-Hartman } 997ab4382d2SGreg Kroah-Hartman 998ab4382d2SGreg Kroah-Hartman #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 999ab4382d2SGreg Kroah-Hartman 1000ab4382d2SGreg Kroah-Hartman static inline void wait_for_xmitr(struct uart_omap_port *up) 1001ab4382d2SGreg Kroah-Hartman { 1002ab4382d2SGreg Kroah-Hartman unsigned int status, tmout = 10000; 1003ab4382d2SGreg Kroah-Hartman 1004ab4382d2SGreg Kroah-Hartman /* Wait up to 10ms for the character(s) to be sent. */ 1005ab4382d2SGreg Kroah-Hartman do { 1006ab4382d2SGreg Kroah-Hartman status = serial_in(up, UART_LSR); 1007ab4382d2SGreg Kroah-Hartman 1008ab4382d2SGreg Kroah-Hartman if (status & UART_LSR_BI) 1009ab4382d2SGreg Kroah-Hartman up->lsr_break_flag = UART_LSR_BI; 1010ab4382d2SGreg Kroah-Hartman 1011ab4382d2SGreg Kroah-Hartman if (--tmout == 0) 1012ab4382d2SGreg Kroah-Hartman break; 1013ab4382d2SGreg Kroah-Hartman udelay(1); 1014ab4382d2SGreg Kroah-Hartman } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 1015ab4382d2SGreg Kroah-Hartman 1016ab4382d2SGreg Kroah-Hartman /* Wait up to 1s for flow control if necessary */ 1017ab4382d2SGreg Kroah-Hartman if (up->port.flags & UPF_CONS_FLOW) { 1018ab4382d2SGreg Kroah-Hartman tmout = 1000000; 1019ab4382d2SGreg Kroah-Hartman for (tmout = 1000000; tmout; tmout--) { 1020ab4382d2SGreg Kroah-Hartman unsigned int msr = serial_in(up, UART_MSR); 1021ab4382d2SGreg Kroah-Hartman 1022ab4382d2SGreg Kroah-Hartman up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1023ab4382d2SGreg Kroah-Hartman if (msr & UART_MSR_CTS) 1024ab4382d2SGreg Kroah-Hartman break; 1025ab4382d2SGreg Kroah-Hartman 1026ab4382d2SGreg Kroah-Hartman udelay(1); 1027ab4382d2SGreg Kroah-Hartman } 1028ab4382d2SGreg Kroah-Hartman } 1029ab4382d2SGreg Kroah-Hartman } 1030ab4382d2SGreg Kroah-Hartman 1031ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1032ab4382d2SGreg Kroah-Hartman 1033ab4382d2SGreg Kroah-Hartman static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1034ab4382d2SGreg Kroah-Hartman { 1035ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1036fcdca757SGovindraj.R 1037fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1038ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1039ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1040fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 1041ab4382d2SGreg Kroah-Hartman } 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman static int serial_omap_poll_get_char(struct uart_port *port) 1044ab4382d2SGreg Kroah-Hartman { 1045ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1046fcdca757SGovindraj.R unsigned int status; 1047ab4382d2SGreg Kroah-Hartman 1048fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1049fcdca757SGovindraj.R status = serial_in(up, UART_LSR); 1050ab4382d2SGreg Kroah-Hartman if (!(status & UART_LSR_DR)) 1051ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 1052ab4382d2SGreg Kroah-Hartman 1053fcdca757SGovindraj.R status = serial_in(up, UART_RX); 1054fcdca757SGovindraj.R pm_runtime_put(&up->pdev->dev); 1055fcdca757SGovindraj.R return status; 1056ab4382d2SGreg Kroah-Hartman } 1057ab4382d2SGreg Kroah-Hartman 1058ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_CONSOLE_POLL */ 1059ab4382d2SGreg Kroah-Hartman 1060ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1061ab4382d2SGreg Kroah-Hartman 1062ab4382d2SGreg Kroah-Hartman static struct uart_omap_port *serial_omap_console_ports[4]; 1063ab4382d2SGreg Kroah-Hartman 1064ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg; 1065ab4382d2SGreg Kroah-Hartman 1066ab4382d2SGreg Kroah-Hartman static void serial_omap_console_putchar(struct uart_port *port, int ch) 1067ab4382d2SGreg Kroah-Hartman { 1068ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)port; 1069ab4382d2SGreg Kroah-Hartman 1070ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1071ab4382d2SGreg Kroah-Hartman serial_out(up, UART_TX, ch); 1072ab4382d2SGreg Kroah-Hartman } 1073ab4382d2SGreg Kroah-Hartman 1074ab4382d2SGreg Kroah-Hartman static void 1075ab4382d2SGreg Kroah-Hartman serial_omap_console_write(struct console *co, const char *s, 1076ab4382d2SGreg Kroah-Hartman unsigned int count) 1077ab4382d2SGreg Kroah-Hartman { 1078ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1079ab4382d2SGreg Kroah-Hartman unsigned long flags; 1080ab4382d2SGreg Kroah-Hartman unsigned int ier; 1081ab4382d2SGreg Kroah-Hartman int locked = 1; 1082ab4382d2SGreg Kroah-Hartman 1083fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1084fcdca757SGovindraj.R 1085ab4382d2SGreg Kroah-Hartman local_irq_save(flags); 1086ab4382d2SGreg Kroah-Hartman if (up->port.sysrq) 1087ab4382d2SGreg Kroah-Hartman locked = 0; 1088ab4382d2SGreg Kroah-Hartman else if (oops_in_progress) 1089ab4382d2SGreg Kroah-Hartman locked = spin_trylock(&up->port.lock); 1090ab4382d2SGreg Kroah-Hartman else 1091ab4382d2SGreg Kroah-Hartman spin_lock(&up->port.lock); 1092ab4382d2SGreg Kroah-Hartman 1093ab4382d2SGreg Kroah-Hartman /* 1094ab4382d2SGreg Kroah-Hartman * First save the IER then disable the interrupts 1095ab4382d2SGreg Kroah-Hartman */ 1096ab4382d2SGreg Kroah-Hartman ier = serial_in(up, UART_IER); 1097ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, 0); 1098ab4382d2SGreg Kroah-Hartman 1099ab4382d2SGreg Kroah-Hartman uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman /* 1102ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 1103ab4382d2SGreg Kroah-Hartman * and restore the IER 1104ab4382d2SGreg Kroah-Hartman */ 1105ab4382d2SGreg Kroah-Hartman wait_for_xmitr(up); 1106ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, ier); 1107ab4382d2SGreg Kroah-Hartman /* 1108ab4382d2SGreg Kroah-Hartman * The receive handling will happen properly because the 1109ab4382d2SGreg Kroah-Hartman * receive ready bit will still be set; it is not cleared 1110ab4382d2SGreg Kroah-Hartman * on read. However, modem control will not, we must 1111ab4382d2SGreg Kroah-Hartman * call it if we have saved something in the saved flags 1112ab4382d2SGreg Kroah-Hartman * while processing with interrupts off. 1113ab4382d2SGreg Kroah-Hartman */ 1114ab4382d2SGreg Kroah-Hartman if (up->msr_saved_flags) 1115ab4382d2SGreg Kroah-Hartman check_modem_status(up); 1116ab4382d2SGreg Kroah-Hartman 1117fcdca757SGovindraj.R pm_runtime_mark_last_busy(&up->pdev->dev); 1118fcdca757SGovindraj.R pm_runtime_put_autosuspend(&up->pdev->dev); 1119ab4382d2SGreg Kroah-Hartman if (locked) 1120ab4382d2SGreg Kroah-Hartman spin_unlock(&up->port.lock); 1121ab4382d2SGreg Kroah-Hartman local_irq_restore(flags); 1122ab4382d2SGreg Kroah-Hartman } 1123ab4382d2SGreg Kroah-Hartman 1124ab4382d2SGreg Kroah-Hartman static int __init 1125ab4382d2SGreg Kroah-Hartman serial_omap_console_setup(struct console *co, char *options) 1126ab4382d2SGreg Kroah-Hartman { 1127ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1128ab4382d2SGreg Kroah-Hartman int baud = 115200; 1129ab4382d2SGreg Kroah-Hartman int bits = 8; 1130ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1131ab4382d2SGreg Kroah-Hartman int flow = 'n'; 1132ab4382d2SGreg Kroah-Hartman 1133ab4382d2SGreg Kroah-Hartman if (serial_omap_console_ports[co->index] == NULL) 1134ab4382d2SGreg Kroah-Hartman return -ENODEV; 1135ab4382d2SGreg Kroah-Hartman up = serial_omap_console_ports[co->index]; 1136ab4382d2SGreg Kroah-Hartman 1137ab4382d2SGreg Kroah-Hartman if (options) 1138ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman return uart_set_options(&up->port, co, baud, parity, bits, flow); 1141ab4382d2SGreg Kroah-Hartman } 1142ab4382d2SGreg Kroah-Hartman 1143ab4382d2SGreg Kroah-Hartman static struct console serial_omap_console = { 1144ab4382d2SGreg Kroah-Hartman .name = OMAP_SERIAL_NAME, 1145ab4382d2SGreg Kroah-Hartman .write = serial_omap_console_write, 1146ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1147ab4382d2SGreg Kroah-Hartman .setup = serial_omap_console_setup, 1148ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1149ab4382d2SGreg Kroah-Hartman .index = -1, 1150ab4382d2SGreg Kroah-Hartman .data = &serial_omap_reg, 1151ab4382d2SGreg Kroah-Hartman }; 1152ab4382d2SGreg Kroah-Hartman 1153ab4382d2SGreg Kroah-Hartman static void serial_omap_add_console_port(struct uart_omap_port *up) 1154ab4382d2SGreg Kroah-Hartman { 1155ba77433dSRajendra Nayak serial_omap_console_ports[up->port.line] = up; 1156ab4382d2SGreg Kroah-Hartman } 1157ab4382d2SGreg Kroah-Hartman 1158ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE (&serial_omap_console) 1159ab4382d2SGreg Kroah-Hartman 1160ab4382d2SGreg Kroah-Hartman #else 1161ab4382d2SGreg Kroah-Hartman 1162ab4382d2SGreg Kroah-Hartman #define OMAP_CONSOLE NULL 1163ab4382d2SGreg Kroah-Hartman 1164ab4382d2SGreg Kroah-Hartman static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1165ab4382d2SGreg Kroah-Hartman {} 1166ab4382d2SGreg Kroah-Hartman 1167ab4382d2SGreg Kroah-Hartman #endif 1168ab4382d2SGreg Kroah-Hartman 1169ab4382d2SGreg Kroah-Hartman static struct uart_ops serial_omap_pops = { 1170ab4382d2SGreg Kroah-Hartman .tx_empty = serial_omap_tx_empty, 1171ab4382d2SGreg Kroah-Hartman .set_mctrl = serial_omap_set_mctrl, 1172ab4382d2SGreg Kroah-Hartman .get_mctrl = serial_omap_get_mctrl, 1173ab4382d2SGreg Kroah-Hartman .stop_tx = serial_omap_stop_tx, 1174ab4382d2SGreg Kroah-Hartman .start_tx = serial_omap_start_tx, 1175ab4382d2SGreg Kroah-Hartman .stop_rx = serial_omap_stop_rx, 1176ab4382d2SGreg Kroah-Hartman .enable_ms = serial_omap_enable_ms, 1177ab4382d2SGreg Kroah-Hartman .break_ctl = serial_omap_break_ctl, 1178ab4382d2SGreg Kroah-Hartman .startup = serial_omap_startup, 1179ab4382d2SGreg Kroah-Hartman .shutdown = serial_omap_shutdown, 1180ab4382d2SGreg Kroah-Hartman .set_termios = serial_omap_set_termios, 1181ab4382d2SGreg Kroah-Hartman .pm = serial_omap_pm, 1182ab4382d2SGreg Kroah-Hartman .type = serial_omap_type, 1183ab4382d2SGreg Kroah-Hartman .release_port = serial_omap_release_port, 1184ab4382d2SGreg Kroah-Hartman .request_port = serial_omap_request_port, 1185ab4382d2SGreg Kroah-Hartman .config_port = serial_omap_config_port, 1186ab4382d2SGreg Kroah-Hartman .verify_port = serial_omap_verify_port, 1187ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 1188ab4382d2SGreg Kroah-Hartman .poll_put_char = serial_omap_poll_put_char, 1189ab4382d2SGreg Kroah-Hartman .poll_get_char = serial_omap_poll_get_char, 1190ab4382d2SGreg Kroah-Hartman #endif 1191ab4382d2SGreg Kroah-Hartman }; 1192ab4382d2SGreg Kroah-Hartman 1193ab4382d2SGreg Kroah-Hartman static struct uart_driver serial_omap_reg = { 1194ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1195ab4382d2SGreg Kroah-Hartman .driver_name = "OMAP-SERIAL", 1196ab4382d2SGreg Kroah-Hartman .dev_name = OMAP_SERIAL_NAME, 1197ab4382d2SGreg Kroah-Hartman .nr = OMAP_MAX_HSUART_PORTS, 1198ab4382d2SGreg Kroah-Hartman .cons = OMAP_CONSOLE, 1199ab4382d2SGreg Kroah-Hartman }; 1200ab4382d2SGreg Kroah-Hartman 12013bc4f0d8SShubhrajyoti D #ifdef CONFIG_PM_SLEEP 1202fcdca757SGovindraj.R static int serial_omap_suspend(struct device *dev) 1203ab4382d2SGreg Kroah-Hartman { 1204fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1205ab4382d2SGreg Kroah-Hartman 12062fd14964SGovindraj.R if (up) { 1207ab4382d2SGreg Kroah-Hartman uart_suspend_port(&serial_omap_reg, &up->port); 120843829731STejun Heo flush_work(&up->qos_work); 12092fd14964SGovindraj.R } 12102fd14964SGovindraj.R 1211ab4382d2SGreg Kroah-Hartman return 0; 1212ab4382d2SGreg Kroah-Hartman } 1213ab4382d2SGreg Kroah-Hartman 1214fcdca757SGovindraj.R static int serial_omap_resume(struct device *dev) 1215ab4382d2SGreg Kroah-Hartman { 1216fcdca757SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman if (up) 1219ab4382d2SGreg Kroah-Hartman uart_resume_port(&serial_omap_reg, &up->port); 1220ab4382d2SGreg Kroah-Hartman return 0; 1221ab4382d2SGreg Kroah-Hartman } 1222fcdca757SGovindraj.R #endif 1223ab4382d2SGreg Kroah-Hartman 1224a9e210e0SJon Hunter static void serial_omap_rxdma_poll(unsigned long uart_no) 1225ab4382d2SGreg Kroah-Hartman { 1226ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = ui[uart_no]; 1227ab4382d2SGreg Kroah-Hartman unsigned int curr_dma_pos, curr_transmitted_size; 1228ab4382d2SGreg Kroah-Hartman int ret = 0; 1229ab4382d2SGreg Kroah-Hartman 1230ab4382d2SGreg Kroah-Hartman curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel); 1231ab4382d2SGreg Kroah-Hartman if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || 1232ab4382d2SGreg Kroah-Hartman (curr_dma_pos == 0)) { 1233ab4382d2SGreg Kroah-Hartman if (jiffies_to_msecs(jiffies - up->port_activity) < 1234a9e210e0SJon Hunter up->uart_dma.rx_timeout) { 1235ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1236a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1237ab4382d2SGreg Kroah-Hartman } else { 1238ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1239ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1240ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1241ab4382d2SGreg Kroah-Hartman } 1242ab4382d2SGreg Kroah-Hartman return; 1243ab4382d2SGreg Kroah-Hartman } 1244ab4382d2SGreg Kroah-Hartman 1245ab4382d2SGreg Kroah-Hartman curr_transmitted_size = curr_dma_pos - 1246ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos; 1247ab4382d2SGreg Kroah-Hartman up->port.icount.rx += curr_transmitted_size; 1248ab4382d2SGreg Kroah-Hartman tty_insert_flip_string(up->port.state->port.tty, 1249ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf + 1250ab4382d2SGreg Kroah-Hartman (up->uart_dma.prev_rx_dma_pos - 1251ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys), 1252ab4382d2SGreg Kroah-Hartman curr_transmitted_size); 1253ab4382d2SGreg Kroah-Hartman tty_flip_buffer_push(up->port.state->port.tty); 1254ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = curr_dma_pos; 1255ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_buf_size + 1256ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys == curr_dma_pos) { 1257ab4382d2SGreg Kroah-Hartman ret = serial_omap_start_rxdma(up); 1258ab4382d2SGreg Kroah-Hartman if (ret < 0) { 1259ab4382d2SGreg Kroah-Hartman serial_omap_stop_rxdma(up); 1260ab4382d2SGreg Kroah-Hartman up->ier |= (UART_IER_RDI | UART_IER_RLSI); 1261ab4382d2SGreg Kroah-Hartman serial_out(up, UART_IER, up->ier); 1262ab4382d2SGreg Kroah-Hartman } 1263ab4382d2SGreg Kroah-Hartman } else { 1264ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1265a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1266ab4382d2SGreg Kroah-Hartman } 1267ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1268ab4382d2SGreg Kroah-Hartman } 1269ab4382d2SGreg Kroah-Hartman 1270ab4382d2SGreg Kroah-Hartman static void uart_rx_dma_callback(int lch, u16 ch_status, void *data) 1271ab4382d2SGreg Kroah-Hartman { 1272ab4382d2SGreg Kroah-Hartman return; 1273ab4382d2SGreg Kroah-Hartman } 1274ab4382d2SGreg Kroah-Hartman 1275ab4382d2SGreg Kroah-Hartman static int serial_omap_start_rxdma(struct uart_omap_port *up) 1276ab4382d2SGreg Kroah-Hartman { 1277ab4382d2SGreg Kroah-Hartman int ret = 0; 1278ab4382d2SGreg Kroah-Hartman 1279ab4382d2SGreg Kroah-Hartman if (up->uart_dma.rx_dma_channel == -1) { 1280fcdca757SGovindraj.R pm_runtime_get_sync(&up->pdev->dev); 1281ab4382d2SGreg Kroah-Hartman ret = omap_request_dma(up->uart_dma.uart_dma_rx, 1282ab4382d2SGreg Kroah-Hartman "UART Rx DMA", 1283ab4382d2SGreg Kroah-Hartman (void *)uart_rx_dma_callback, up, 1284ab4382d2SGreg Kroah-Hartman &(up->uart_dma.rx_dma_channel)); 1285ab4382d2SGreg Kroah-Hartman if (ret < 0) 1286ab4382d2SGreg Kroah-Hartman return ret; 1287ab4382d2SGreg Kroah-Hartman 1288ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, 1289ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1290ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1291ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, 1292ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, 1293ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_dma_phys, 0, 0); 1294ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, 1295ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1296ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_buf_size, 1, 1297ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1298ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx, 0); 1299ab4382d2SGreg Kroah-Hartman } 1300ab4382d2SGreg Kroah-Hartman up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; 1301ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1302ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.rx_dma_channel); 1303ab4382d2SGreg Kroah-Hartman mod_timer(&up->uart_dma.rx_timer, jiffies + 1304a9e210e0SJon Hunter usecs_to_jiffies(up->uart_dma.rx_poll_rate)); 1305ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_used = true; 1306ab4382d2SGreg Kroah-Hartman return ret; 1307ab4382d2SGreg Kroah-Hartman } 1308ab4382d2SGreg Kroah-Hartman 1309ab4382d2SGreg Kroah-Hartman static void serial_omap_continue_tx(struct uart_omap_port *up) 1310ab4382d2SGreg Kroah-Hartman { 1311ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1312ab4382d2SGreg Kroah-Hartman unsigned int start = up->uart_dma.tx_buf_dma_phys 1313ab4382d2SGreg Kroah-Hartman + (xmit->tail & (UART_XMIT_SIZE - 1)); 1314ab4382d2SGreg Kroah-Hartman 1315ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 1316ab4382d2SGreg Kroah-Hartman return; 1317ab4382d2SGreg Kroah-Hartman 1318ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit); 1319ab4382d2SGreg Kroah-Hartman /* 1320ab4382d2SGreg Kroah-Hartman * It is a circular buffer. See if the buffer has wounded back. 1321ab4382d2SGreg Kroah-Hartman * If yes it will have to be transferred in two separate dma 1322ab4382d2SGreg Kroah-Hartman * transfers 1323ab4382d2SGreg Kroah-Hartman */ 1324ab4382d2SGreg Kroah-Hartman if (start + up->uart_dma.tx_buf_size >= 1325ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) 1326ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size = 1327ab4382d2SGreg Kroah-Hartman (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start; 1328ab4382d2SGreg Kroah-Hartman omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0, 1329ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_CONSTANT, 1330ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base, 0, 0); 1331ab4382d2SGreg Kroah-Hartman omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0, 1332ab4382d2SGreg Kroah-Hartman OMAP_DMA_AMODE_POST_INC, start, 0, 0); 1333ab4382d2SGreg Kroah-Hartman omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel, 1334ab4382d2SGreg Kroah-Hartman OMAP_DMA_DATA_TYPE_S8, 1335ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_buf_size, 1, 1336ab4382d2SGreg Kroah-Hartman OMAP_DMA_SYNC_ELEMENT, 1337ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx, 0); 1338ab4382d2SGreg Kroah-Hartman /* FIXME: Cache maintenance needed here? */ 1339ab4382d2SGreg Kroah-Hartman omap_start_dma(up->uart_dma.tx_dma_channel); 1340ab4382d2SGreg Kroah-Hartman } 1341ab4382d2SGreg Kroah-Hartman 1342ab4382d2SGreg Kroah-Hartman static void uart_tx_dma_callback(int lch, u16 ch_status, void *data) 1343ab4382d2SGreg Kroah-Hartman { 1344ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = (struct uart_omap_port *)data; 1345ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &up->port.state->xmit; 1346ab4382d2SGreg Kroah-Hartman 1347ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \ 1348ab4382d2SGreg Kroah-Hartman (UART_XMIT_SIZE - 1); 1349ab4382d2SGreg Kroah-Hartman up->port.icount.tx += up->uart_dma.tx_buf_size; 1350ab4382d2SGreg Kroah-Hartman 1351ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1352ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&up->port); 1353ab4382d2SGreg Kroah-Hartman 1354ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) { 1355ab4382d2SGreg Kroah-Hartman spin_lock(&(up->uart_dma.tx_lock)); 1356ab4382d2SGreg Kroah-Hartman serial_omap_stop_tx(&up->port); 1357ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_used = false; 1358ab4382d2SGreg Kroah-Hartman spin_unlock(&(up->uart_dma.tx_lock)); 1359ab4382d2SGreg Kroah-Hartman } else { 1360ab4382d2SGreg Kroah-Hartman omap_stop_dma(up->uart_dma.tx_dma_channel); 1361ab4382d2SGreg Kroah-Hartman serial_omap_continue_tx(up); 1362ab4382d2SGreg Kroah-Hartman } 1363ab4382d2SGreg Kroah-Hartman up->port_activity = jiffies; 1364ab4382d2SGreg Kroah-Hartman return; 1365ab4382d2SGreg Kroah-Hartman } 1366ab4382d2SGreg Kroah-Hartman 13677c77c8deSGovindraj.R static void omap_serial_fill_features_erratas(struct uart_omap_port *up) 13687c77c8deSGovindraj.R { 13697c77c8deSGovindraj.R u32 mvr, scheme; 13707c77c8deSGovindraj.R u16 revision, major, minor; 13717c77c8deSGovindraj.R 13727c77c8deSGovindraj.R mvr = serial_in(up, UART_OMAP_MVER); 13737c77c8deSGovindraj.R 13747c77c8deSGovindraj.R /* Check revision register scheme */ 13757c77c8deSGovindraj.R scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT; 13767c77c8deSGovindraj.R 13777c77c8deSGovindraj.R switch (scheme) { 13787c77c8deSGovindraj.R case 0: /* Legacy Scheme: OMAP2/3 */ 13797c77c8deSGovindraj.R /* MINOR_REV[0:4], MAJOR_REV[4:7] */ 13807c77c8deSGovindraj.R major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >> 13817c77c8deSGovindraj.R OMAP_UART_LEGACY_MVR_MAJ_SHIFT; 13827c77c8deSGovindraj.R minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK); 13837c77c8deSGovindraj.R break; 13847c77c8deSGovindraj.R case 1: 13857c77c8deSGovindraj.R /* New Scheme: OMAP4+ */ 13867c77c8deSGovindraj.R /* MINOR_REV[0:5], MAJOR_REV[8:10] */ 13877c77c8deSGovindraj.R major = (mvr & OMAP_UART_MVR_MAJ_MASK) >> 13887c77c8deSGovindraj.R OMAP_UART_MVR_MAJ_SHIFT; 13897c77c8deSGovindraj.R minor = (mvr & OMAP_UART_MVR_MIN_MASK); 13907c77c8deSGovindraj.R break; 13917c77c8deSGovindraj.R default: 13927c77c8deSGovindraj.R dev_warn(&up->pdev->dev, 13937c77c8deSGovindraj.R "Unknown %s revision, defaulting to highest\n", 13947c77c8deSGovindraj.R up->name); 13957c77c8deSGovindraj.R /* highest possible revision */ 13967c77c8deSGovindraj.R major = 0xff; 13977c77c8deSGovindraj.R minor = 0xff; 13987c77c8deSGovindraj.R } 13997c77c8deSGovindraj.R 14007c77c8deSGovindraj.R /* normalize revision for the driver */ 14017c77c8deSGovindraj.R revision = UART_BUILD_REVISION(major, minor); 14027c77c8deSGovindraj.R 14037c77c8deSGovindraj.R switch (revision) { 14047c77c8deSGovindraj.R case OMAP_UART_REV_46: 14057c77c8deSGovindraj.R up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 14067c77c8deSGovindraj.R UART_ERRATA_i291_DMA_FORCEIDLE); 14077c77c8deSGovindraj.R break; 14087c77c8deSGovindraj.R case OMAP_UART_REV_52: 14097c77c8deSGovindraj.R up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 14107c77c8deSGovindraj.R UART_ERRATA_i291_DMA_FORCEIDLE); 14117c77c8deSGovindraj.R break; 14127c77c8deSGovindraj.R case OMAP_UART_REV_63: 14137c77c8deSGovindraj.R up->errata |= UART_ERRATA_i202_MDR1_ACCESS; 14147c77c8deSGovindraj.R break; 14157c77c8deSGovindraj.R default: 14167c77c8deSGovindraj.R break; 14177c77c8deSGovindraj.R } 14187c77c8deSGovindraj.R } 14197c77c8deSGovindraj.R 1420d92b0dfcSRajendra Nayak static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) 1421d92b0dfcSRajendra Nayak { 1422d92b0dfcSRajendra Nayak struct omap_uart_port_info *omap_up_info; 1423d92b0dfcSRajendra Nayak 1424d92b0dfcSRajendra Nayak omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); 1425d92b0dfcSRajendra Nayak if (!omap_up_info) 1426d92b0dfcSRajendra Nayak return NULL; /* out of memory */ 1427d92b0dfcSRajendra Nayak 1428d92b0dfcSRajendra Nayak of_property_read_u32(dev->of_node, "clock-frequency", 1429d92b0dfcSRajendra Nayak &omap_up_info->uartclk); 1430d92b0dfcSRajendra Nayak return omap_up_info; 1431d92b0dfcSRajendra Nayak } 1432d92b0dfcSRajendra Nayak 1433ab4382d2SGreg Kroah-Hartman static int serial_omap_probe(struct platform_device *pdev) 1434ab4382d2SGreg Kroah-Hartman { 1435ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up; 1436ab4382d2SGreg Kroah-Hartman struct resource *mem, *irq, *dma_tx, *dma_rx; 1437ab4382d2SGreg Kroah-Hartman struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; 1438ab4382d2SGreg Kroah-Hartman int ret = -ENOSPC; 1439ab4382d2SGreg Kroah-Hartman 1440d92b0dfcSRajendra Nayak if (pdev->dev.of_node) 1441d92b0dfcSRajendra Nayak omap_up_info = of_get_uart_port_info(&pdev->dev); 1442d92b0dfcSRajendra Nayak 1443ab4382d2SGreg Kroah-Hartman mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1444ab4382d2SGreg Kroah-Hartman if (!mem) { 1445ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no mem resource?\n"); 1446ab4382d2SGreg Kroah-Hartman return -ENODEV; 1447ab4382d2SGreg Kroah-Hartman } 1448ab4382d2SGreg Kroah-Hartman 1449ab4382d2SGreg Kroah-Hartman irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1450ab4382d2SGreg Kroah-Hartman if (!irq) { 1451ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "no irq resource?\n"); 1452ab4382d2SGreg Kroah-Hartman return -ENODEV; 1453ab4382d2SGreg Kroah-Hartman } 1454ab4382d2SGreg Kroah-Hartman 1455388bc262SShubhrajyoti D if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem), 1456ab4382d2SGreg Kroah-Hartman pdev->dev.driver->name)) { 1457ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "memory region already claimed\n"); 1458ab4382d2SGreg Kroah-Hartman return -EBUSY; 1459ab4382d2SGreg Kroah-Hartman } 1460ab4382d2SGreg Kroah-Hartman 1461ab4382d2SGreg Kroah-Hartman dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 1462388bc262SShubhrajyoti D if (!dma_rx) 1463388bc262SShubhrajyoti D return -ENXIO; 1464ab4382d2SGreg Kroah-Hartman 1465ab4382d2SGreg Kroah-Hartman dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 1466388bc262SShubhrajyoti D if (!dma_tx) 1467388bc262SShubhrajyoti D return -ENXIO; 1468ab4382d2SGreg Kroah-Hartman 1469388bc262SShubhrajyoti D up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); 1470388bc262SShubhrajyoti D if (!up) 1471388bc262SShubhrajyoti D return -ENOMEM; 1472388bc262SShubhrajyoti D 1473ab4382d2SGreg Kroah-Hartman up->pdev = pdev; 1474ab4382d2SGreg Kroah-Hartman up->port.dev = &pdev->dev; 1475ab4382d2SGreg Kroah-Hartman up->port.type = PORT_OMAP; 1476ab4382d2SGreg Kroah-Hartman up->port.iotype = UPIO_MEM; 1477ab4382d2SGreg Kroah-Hartman up->port.irq = irq->start; 1478ab4382d2SGreg Kroah-Hartman 1479ab4382d2SGreg Kroah-Hartman up->port.regshift = 2; 1480ab4382d2SGreg Kroah-Hartman up->port.fifosize = 64; 1481ab4382d2SGreg Kroah-Hartman up->port.ops = &serial_omap_pops; 1482ab4382d2SGreg Kroah-Hartman 1483d92b0dfcSRajendra Nayak if (pdev->dev.of_node) 1484d92b0dfcSRajendra Nayak up->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); 1485d92b0dfcSRajendra Nayak else 1486ab4382d2SGreg Kroah-Hartman up->port.line = pdev->id; 1487ab4382d2SGreg Kroah-Hartman 1488d92b0dfcSRajendra Nayak if (up->port.line < 0) { 1489d92b0dfcSRajendra Nayak dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", 1490d92b0dfcSRajendra Nayak up->port.line); 1491d92b0dfcSRajendra Nayak ret = -ENODEV; 1492388bc262SShubhrajyoti D goto err_port_line; 1493d92b0dfcSRajendra Nayak } 1494d92b0dfcSRajendra Nayak 1495d92b0dfcSRajendra Nayak sprintf(up->name, "OMAP UART%d", up->port.line); 1496edd70ad7SGovindraj.R up->port.mapbase = mem->start; 1497388bc262SShubhrajyoti D up->port.membase = devm_ioremap(&pdev->dev, mem->start, 1498388bc262SShubhrajyoti D resource_size(mem)); 1499edd70ad7SGovindraj.R if (!up->port.membase) { 1500edd70ad7SGovindraj.R dev_err(&pdev->dev, "can't ioremap UART\n"); 1501edd70ad7SGovindraj.R ret = -ENOMEM; 1502388bc262SShubhrajyoti D goto err_ioremap; 1503edd70ad7SGovindraj.R } 1504edd70ad7SGovindraj.R 1505ab4382d2SGreg Kroah-Hartman up->port.flags = omap_up_info->flags; 1506ab4382d2SGreg Kroah-Hartman up->port.uartclk = omap_up_info->uartclk; 15078fe789dcSRajendra Nayak if (!up->port.uartclk) { 15088fe789dcSRajendra Nayak up->port.uartclk = DEFAULT_CLK_SPEED; 15098fe789dcSRajendra Nayak dev_warn(&pdev->dev, "No clock speed specified: using default:" 15108fe789dcSRajendra Nayak "%d\n", DEFAULT_CLK_SPEED); 15118fe789dcSRajendra Nayak } 1512ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_base = mem->start; 1513ab4382d2SGreg Kroah-Hartman 1514ab4382d2SGreg Kroah-Hartman if (omap_up_info->dma_enabled) { 1515ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_tx = dma_tx->start; 1516ab4382d2SGreg Kroah-Hartman up->uart_dma.uart_dma_rx = dma_rx->start; 1517ab4382d2SGreg Kroah-Hartman up->use_dma = 1; 1518c86845dbSDeepak K up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size; 1519c86845dbSDeepak K up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout; 1520a9e210e0SJon Hunter up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate; 1521ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.tx_lock)); 1522ab4382d2SGreg Kroah-Hartman spin_lock_init(&(up->uart_dma.rx_lock)); 1523ab4382d2SGreg Kroah-Hartman up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE; 1524ab4382d2SGreg Kroah-Hartman up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE; 1525ab4382d2SGreg Kroah-Hartman } 1526ab4382d2SGreg Kroah-Hartman 15272fd14964SGovindraj.R up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 15282fd14964SGovindraj.R up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 15292fd14964SGovindraj.R pm_qos_add_request(&up->pm_qos_request, 15302fd14964SGovindraj.R PM_QOS_CPU_DMA_LATENCY, up->latency); 15312fd14964SGovindraj.R serial_omap_uart_wq = create_singlethread_workqueue(up->name); 15322fd14964SGovindraj.R INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 15332fd14964SGovindraj.R 1534fcdca757SGovindraj.R pm_runtime_use_autosuspend(&pdev->dev); 1535fcdca757SGovindraj.R pm_runtime_set_autosuspend_delay(&pdev->dev, 1536c86845dbSDeepak K omap_up_info->autosuspend_timeout); 1537fcdca757SGovindraj.R 1538fcdca757SGovindraj.R pm_runtime_irq_safe(&pdev->dev); 1539fcdca757SGovindraj.R pm_runtime_enable(&pdev->dev); 1540fcdca757SGovindraj.R pm_runtime_get_sync(&pdev->dev); 1541fcdca757SGovindraj.R 15427c77c8deSGovindraj.R omap_serial_fill_features_erratas(up); 15437c77c8deSGovindraj.R 1544ba77433dSRajendra Nayak ui[up->port.line] = up; 1545ab4382d2SGreg Kroah-Hartman serial_omap_add_console_port(up); 1546ab4382d2SGreg Kroah-Hartman 1547ab4382d2SGreg Kroah-Hartman ret = uart_add_one_port(&serial_omap_reg, &up->port); 1548ab4382d2SGreg Kroah-Hartman if (ret != 0) 1549388bc262SShubhrajyoti D goto err_add_port; 1550ab4382d2SGreg Kroah-Hartman 1551fcdca757SGovindraj.R pm_runtime_put(&pdev->dev); 1552ab4382d2SGreg Kroah-Hartman platform_set_drvdata(pdev, up); 1553ab4382d2SGreg Kroah-Hartman return 0; 1554388bc262SShubhrajyoti D 1555388bc262SShubhrajyoti D err_add_port: 1556388bc262SShubhrajyoti D pm_runtime_put(&pdev->dev); 1557388bc262SShubhrajyoti D pm_runtime_disable(&pdev->dev); 1558388bc262SShubhrajyoti D err_ioremap: 1559388bc262SShubhrajyoti D err_port_line: 1560ab4382d2SGreg Kroah-Hartman dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1561ab4382d2SGreg Kroah-Hartman pdev->id, __func__, ret); 1562ab4382d2SGreg Kroah-Hartman return ret; 1563ab4382d2SGreg Kroah-Hartman } 1564ab4382d2SGreg Kroah-Hartman 1565ab4382d2SGreg Kroah-Hartman static int serial_omap_remove(struct platform_device *dev) 1566ab4382d2SGreg Kroah-Hartman { 1567ab4382d2SGreg Kroah-Hartman struct uart_omap_port *up = platform_get_drvdata(dev); 1568ab4382d2SGreg Kroah-Hartman 1569ab4382d2SGreg Kroah-Hartman if (up) { 1570fcdca757SGovindraj.R pm_runtime_disable(&up->pdev->dev); 1571ab4382d2SGreg Kroah-Hartman uart_remove_one_port(&serial_omap_reg, &up->port); 15722fd14964SGovindraj.R pm_qos_remove_request(&up->pm_qos_request); 1573ab4382d2SGreg Kroah-Hartman } 1574fcdca757SGovindraj.R 1575fcdca757SGovindraj.R platform_set_drvdata(dev, NULL); 1576ab4382d2SGreg Kroah-Hartman return 0; 1577ab4382d2SGreg Kroah-Hartman } 1578ab4382d2SGreg Kroah-Hartman 157994734749SGovindraj.R /* 158094734749SGovindraj.R * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 158194734749SGovindraj.R * The access to uart register after MDR1 Access 158294734749SGovindraj.R * causes UART to corrupt data. 158394734749SGovindraj.R * 158494734749SGovindraj.R * Need a delay = 158594734749SGovindraj.R * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 158694734749SGovindraj.R * give 10 times as much 158794734749SGovindraj.R */ 158894734749SGovindraj.R static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 158994734749SGovindraj.R { 159094734749SGovindraj.R u8 timeout = 255; 159194734749SGovindraj.R 159294734749SGovindraj.R serial_out(up, UART_OMAP_MDR1, mdr1); 159394734749SGovindraj.R udelay(2); 159494734749SGovindraj.R serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 159594734749SGovindraj.R UART_FCR_CLEAR_RCVR); 159694734749SGovindraj.R /* 159794734749SGovindraj.R * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 159894734749SGovindraj.R * TX_FIFO_E bit is 1. 159994734749SGovindraj.R */ 160094734749SGovindraj.R while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 160194734749SGovindraj.R (UART_LSR_THRE | UART_LSR_DR))) { 160294734749SGovindraj.R timeout--; 160394734749SGovindraj.R if (!timeout) { 160494734749SGovindraj.R /* Should *never* happen. we warn and carry on */ 160594734749SGovindraj.R dev_crit(&up->pdev->dev, "Errata i202: timedout %x\n", 160694734749SGovindraj.R serial_in(up, UART_LSR)); 160794734749SGovindraj.R break; 160894734749SGovindraj.R } 160994734749SGovindraj.R udelay(1); 161094734749SGovindraj.R } 161194734749SGovindraj.R } 161294734749SGovindraj.R 1613b5148856SShubhrajyoti D #ifdef CONFIG_PM_RUNTIME 16149f9ac1e8SGovindraj.R static void serial_omap_restore_context(struct uart_omap_port *up) 16159f9ac1e8SGovindraj.R { 161694734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 161794734749SGovindraj.R serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 161894734749SGovindraj.R else 16199f9ac1e8SGovindraj.R serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 162094734749SGovindraj.R 16219f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 16229f9ac1e8SGovindraj.R serial_out(up, UART_EFR, UART_EFR_ECB); 16239f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 16249f9ac1e8SGovindraj.R serial_out(up, UART_IER, 0x0); 16259f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1626c538d20cSGovindraj.R serial_out(up, UART_DLL, up->dll); 1627c538d20cSGovindraj.R serial_out(up, UART_DLM, up->dlh); 16289f9ac1e8SGovindraj.R serial_out(up, UART_LCR, 0x0); /* Operational mode */ 16299f9ac1e8SGovindraj.R serial_out(up, UART_IER, up->ier); 16309f9ac1e8SGovindraj.R serial_out(up, UART_FCR, up->fcr); 16319f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 16329f9ac1e8SGovindraj.R serial_out(up, UART_MCR, up->mcr); 16339f9ac1e8SGovindraj.R serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1634c538d20cSGovindraj.R serial_out(up, UART_OMAP_SCR, up->scr); 16359f9ac1e8SGovindraj.R serial_out(up, UART_EFR, up->efr); 16369f9ac1e8SGovindraj.R serial_out(up, UART_LCR, up->lcr); 163794734749SGovindraj.R if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 163894734749SGovindraj.R serial_omap_mdr1_errataset(up, up->mdr1); 163994734749SGovindraj.R else 1640c538d20cSGovindraj.R serial_out(up, UART_OMAP_MDR1, up->mdr1); 16419f9ac1e8SGovindraj.R } 16429f9ac1e8SGovindraj.R 1643fcdca757SGovindraj.R static int serial_omap_runtime_suspend(struct device *dev) 1644fcdca757SGovindraj.R { 1645ec3bebc6SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1646ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 1647ec3bebc6SGovindraj.R 1648ec3bebc6SGovindraj.R if (!up) 1649ec3bebc6SGovindraj.R return -EINVAL; 1650ec3bebc6SGovindraj.R 1651d92b0dfcSRajendra Nayak if (!pdata || !pdata->enable_wakeup) 165262f3ec5fSGovindraj.R return 0; 165362f3ec5fSGovindraj.R 1654ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) 1655ec3bebc6SGovindraj.R up->context_loss_cnt = pdata->get_context_loss_count(dev); 1656ec3bebc6SGovindraj.R 165762f3ec5fSGovindraj.R if (device_may_wakeup(dev)) { 165862f3ec5fSGovindraj.R if (!up->wakeups_enabled) { 165962f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, true); 166062f3ec5fSGovindraj.R up->wakeups_enabled = true; 166162f3ec5fSGovindraj.R } 166262f3ec5fSGovindraj.R } else { 166362f3ec5fSGovindraj.R if (up->wakeups_enabled) { 166462f3ec5fSGovindraj.R pdata->enable_wakeup(up->pdev, false); 166562f3ec5fSGovindraj.R up->wakeups_enabled = false; 166662f3ec5fSGovindraj.R } 166762f3ec5fSGovindraj.R } 166862f3ec5fSGovindraj.R 166994734749SGovindraj.R /* Errata i291 */ 167094734749SGovindraj.R if (up->use_dma && pdata->set_forceidle && 167194734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 167294734749SGovindraj.R pdata->set_forceidle(up->pdev); 167394734749SGovindraj.R 16742fd14964SGovindraj.R up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 16752fd14964SGovindraj.R schedule_work(&up->qos_work); 16762fd14964SGovindraj.R 1677fcdca757SGovindraj.R return 0; 1678fcdca757SGovindraj.R } 1679fcdca757SGovindraj.R 1680fcdca757SGovindraj.R static int serial_omap_runtime_resume(struct device *dev) 1681fcdca757SGovindraj.R { 16829f9ac1e8SGovindraj.R struct uart_omap_port *up = dev_get_drvdata(dev); 1683ec3bebc6SGovindraj.R struct omap_uart_port_info *pdata = dev->platform_data; 16849f9ac1e8SGovindraj.R 1685a5f43138SCousson, Benoit if (up && pdata) { 1686ec3bebc6SGovindraj.R if (pdata->get_context_loss_count) { 1687ec3bebc6SGovindraj.R u32 loss_cnt = pdata->get_context_loss_count(dev); 1688ec3bebc6SGovindraj.R 1689ec3bebc6SGovindraj.R if (up->context_loss_cnt != loss_cnt) 16909f9ac1e8SGovindraj.R serial_omap_restore_context(up); 1691ec3bebc6SGovindraj.R } 169294734749SGovindraj.R 169394734749SGovindraj.R /* Errata i291 */ 169494734749SGovindraj.R if (up->use_dma && pdata->set_noidle && 169594734749SGovindraj.R (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) 169694734749SGovindraj.R pdata->set_noidle(up->pdev); 16972fd14964SGovindraj.R 16982fd14964SGovindraj.R up->latency = up->calc_latency; 16992fd14964SGovindraj.R schedule_work(&up->qos_work); 1700ec3bebc6SGovindraj.R } 17019f9ac1e8SGovindraj.R 1702fcdca757SGovindraj.R return 0; 1703fcdca757SGovindraj.R } 1704fcdca757SGovindraj.R #endif 1705fcdca757SGovindraj.R 1706fcdca757SGovindraj.R static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1707fcdca757SGovindraj.R SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1708fcdca757SGovindraj.R SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1709fcdca757SGovindraj.R serial_omap_runtime_resume, NULL) 1710fcdca757SGovindraj.R }; 1711fcdca757SGovindraj.R 1712d92b0dfcSRajendra Nayak #if defined(CONFIG_OF) 1713d92b0dfcSRajendra Nayak static const struct of_device_id omap_serial_of_match[] = { 1714d92b0dfcSRajendra Nayak { .compatible = "ti,omap2-uart" }, 1715d92b0dfcSRajendra Nayak { .compatible = "ti,omap3-uart" }, 1716d92b0dfcSRajendra Nayak { .compatible = "ti,omap4-uart" }, 1717d92b0dfcSRajendra Nayak {}, 1718d92b0dfcSRajendra Nayak }; 1719d92b0dfcSRajendra Nayak MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1720d92b0dfcSRajendra Nayak #endif 1721d92b0dfcSRajendra Nayak 1722ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_omap_driver = { 1723ab4382d2SGreg Kroah-Hartman .probe = serial_omap_probe, 1724ab4382d2SGreg Kroah-Hartman .remove = serial_omap_remove, 1725ab4382d2SGreg Kroah-Hartman .driver = { 1726ab4382d2SGreg Kroah-Hartman .name = DRIVER_NAME, 1727fcdca757SGovindraj.R .pm = &serial_omap_dev_pm_ops, 1728d92b0dfcSRajendra Nayak .of_match_table = of_match_ptr(omap_serial_of_match), 1729ab4382d2SGreg Kroah-Hartman }, 1730ab4382d2SGreg Kroah-Hartman }; 1731ab4382d2SGreg Kroah-Hartman 1732ab4382d2SGreg Kroah-Hartman static int __init serial_omap_init(void) 1733ab4382d2SGreg Kroah-Hartman { 1734ab4382d2SGreg Kroah-Hartman int ret; 1735ab4382d2SGreg Kroah-Hartman 1736ab4382d2SGreg Kroah-Hartman ret = uart_register_driver(&serial_omap_reg); 1737ab4382d2SGreg Kroah-Hartman if (ret != 0) 1738ab4382d2SGreg Kroah-Hartman return ret; 1739ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_omap_driver); 1740ab4382d2SGreg Kroah-Hartman if (ret != 0) 1741ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1742ab4382d2SGreg Kroah-Hartman return ret; 1743ab4382d2SGreg Kroah-Hartman } 1744ab4382d2SGreg Kroah-Hartman 1745ab4382d2SGreg Kroah-Hartman static void __exit serial_omap_exit(void) 1746ab4382d2SGreg Kroah-Hartman { 1747ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_omap_driver); 1748ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&serial_omap_reg); 1749ab4382d2SGreg Kroah-Hartman } 1750ab4382d2SGreg Kroah-Hartman 1751ab4382d2SGreg Kroah-Hartman module_init(serial_omap_init); 1752ab4382d2SGreg Kroah-Hartman module_exit(serial_omap_exit); 1753ab4382d2SGreg Kroah-Hartman 1754ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1755ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 1756ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Texas Instruments Inc"); 1757