| /* |
| * Driver for OMAP-UART controller. |
| * Based on drivers/serial/8250.c |
| * |
| * Copyright (C) 2010 Texas Instruments. |
| * |
| * Authors: |
| * Govindraj R <govindraj.raja@ti.com> |
| * Thara Gopinath <thara@ti.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * Note: This driver is made separate from 8250 driver as we cannot |
| * over load 8250 driver with omap platform specific configuration for |
| * features like DMA, it makes easier to implement features like DMA and |
| * hardware flow control and software flow control configuration with |
| * this driver as required for the omap-platform. |
| */ |
| |
| #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| #define SUPPORT_SYSRQ |
| #endif |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/console.h> |
| #include <linux/serial_reg.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/tty.h> |
| #include <linux/tty_flip.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| #include <linux/clk.h> |
| #include <linux/serial_core.h> |
| #include <linux/irq.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/of.h> |
| #include <linux/gpio.h> |
| #include <linux/pinctrl/consumer.h> |
| |
| #include <plat/omap-serial.h> |
| |
| #define OMAP_MAX_HSUART_PORTS 6 |
| |
| #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) |
| |
| #define OMAP_UART_REV_42 0x0402 |
| #define OMAP_UART_REV_46 0x0406 |
| #define OMAP_UART_REV_52 0x0502 |
| #define OMAP_UART_REV_63 0x0603 |
| |
| #define UART_ERRATA_i202_MDR1_ACCESS BIT(0) |
| #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1) |
| |
| #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/ |
| |
| /* SCR register bitmasks */ |
| #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) |
| #define OMAP_UART_SCR_TX_EMPTY (1 << 3) |
| |
| /* FCR register bitmasks */ |
| #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) |
| #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4) |
| |
| /* MVR register bitmasks */ |
| #define OMAP_UART_MVR_SCHEME_SHIFT 30 |
| |
| #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 |
| #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 |
| #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f |
| |
| #define OMAP_UART_MVR_MAJ_MASK 0x700 |
| #define OMAP_UART_MVR_MAJ_SHIFT 8 |
| #define OMAP_UART_MVR_MIN_MASK 0x3f |
| |
| #define OMAP_UART_DMA_CH_FREE -1 |
| |
| #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA |
| #define OMAP_MODE13X_SPEED 230400 |
| |
| /* WER = 0x7F |
| * Enable module level wakeup in WER reg |
| */ |
| #define OMAP_UART_WER_MOD_WKUP 0X7F |
| |
| /* Enable XON/XOFF flow control on output */ |
| #define OMAP_UART_SW_TX 0x4 |
| |
| /* Enable XON/XOFF flow control on input */ |
| #define OMAP_UART_SW_RX 0x4 |
| |
| #define OMAP_UART_SW_CLR 0xF0 |
| |
| #define OMAP_UART_TCR_TRIG 0x0F |
| |
| struct uart_omap_dma { |
| u8 uart_dma_tx; |
| u8 uart_dma_rx; |
| int rx_dma_channel; |
| int tx_dma_channel; |
| dma_addr_t rx_buf_dma_phys; |
| dma_addr_t tx_buf_dma_phys; |
| unsigned int uart_base; |
| /* |
| * Buffer for rx dma.It is not required for tx because the buffer |
| * comes from port structure. |
| */ |
| unsigned char *rx_buf; |
| unsigned int prev_rx_dma_pos; |
| int tx_buf_size; |
| int tx_dma_used; |
| int rx_dma_used; |
| spinlock_t tx_lock; |
| spinlock_t rx_lock; |
| /* timer to poll activity on rx dma */ |
| struct timer_list rx_timer; |
| unsigned int rx_buf_size; |
| unsigned int rx_poll_rate; |
| unsigned int rx_timeout; |
| }; |
| |
| struct uart_omap_port { |
| struct uart_port port; |
| struct uart_omap_dma uart_dma; |
| struct device *dev; |
| |
| unsigned char ier; |
| unsigned char lcr; |
| unsigned char mcr; |
| unsigned char fcr; |
| unsigned char efr; |
| unsigned char dll; |
| unsigned char dlh; |
| unsigned char mdr1; |
| unsigned char scr; |
| |
| int use_dma; |
| /* |
| * Some bits in registers are cleared on a read, so they must |
| * be saved whenever the register is read but the bits will not |
| * be immediately processed. |
| */ |
| unsigned int lsr_break_flag; |
| unsigned char msr_saved_flags; |
| char name[20]; |
| unsigned long port_activity; |
| u32 context_loss_cnt; |
| u32 errata; |
| u8 wakeups_enabled; |
| |
| int DTR_gpio; |
| int DTR_inverted; |
| int DTR_active; |
| |
| struct pm_qos_request pm_qos_request; |
| u32 latency; |
| u32 calc_latency; |
| struct work_struct qos_work; |
| struct pinctrl *pins; |
| }; |
| |
| #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) |
| |
| static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; |
| |
| /* Forward declaration of functions */ |
| static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); |
| |
| static struct workqueue_struct *serial_omap_uart_wq; |
| |
| static inline unsigned int serial_in(struct uart_omap_port *up, int offset) |
| { |
| offset <<= up->port.regshift; |
| return readw(up->port.membase + offset); |
| } |
| |
| static inline void serial_out(struct uart_omap_port *up, int offset, int value) |
| { |
| offset <<= up->port.regshift; |
| writew(value, up->port.membase + offset); |
| } |
| |
| static inline void serial_omap_clear_fifos(struct uart_omap_port *up) |
| { |
| serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
| serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | |
| UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
| serial_out(up, UART_FCR, 0); |
| } |
| |
| static int serial_omap_get_context_loss_count(struct uart_omap_port *up) |
| { |
| struct omap_uart_port_info *pdata = up->dev->platform_data; |
| |
| if (!pdata || !pdata->get_context_loss_count) |
| return 0; |
| |
| return pdata->get_context_loss_count(up->dev); |
| } |
| |
| static void serial_omap_set_forceidle(struct uart_omap_port *up) |
| { |
| struct omap_uart_port_info *pdata = up->dev->platform_data; |
| |
| if (!pdata || !pdata->set_forceidle) |
| return; |
| |
| pdata->set_forceidle(up->dev); |
| } |
| |
| static void serial_omap_set_noidle(struct uart_omap_port *up) |
| { |
| struct omap_uart_port_info *pdata = up->dev->platform_data; |
| |
| if (!pdata || !pdata->set_noidle) |
| return; |
| |
| pdata->set_noidle(up->dev); |
| } |
| |
| static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) |
| { |
| struct omap_uart_port_info *pdata = up->dev->platform_data; |
| |
| if (!pdata || !pdata->enable_wakeup) |
| return; |
| |
| pdata->enable_wakeup(up->dev, enable); |
| } |
| |
| /* |
| * serial_omap_get_divisor - calculate divisor value |
| * @port: uart port info |
| * @baud: baudrate for which divisor needs to be calculated. |
| * |
| * We have written our own function to get the divisor so as to support |
| * 13x mode. 3Mbps Baudrate as an different divisor. |
| * Reference OMAP TRM Chapter 17: |
| * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates |
| * referring to oversampling - divisor value |
| * baudrate 460,800 to 3,686,400 all have divisor 13 |
| * except 3,000,000 which has divisor value 16 |
| */ |
| static unsigned int |
| serial_omap_get_divisor(struct uart_port *port, unsigned int baud) |
| { |
| unsigned int divisor; |
| |
| if (baud > OMAP_MODE13X_SPEED && baud != 3000000) |
| divisor = 13; |
| else |
| divisor = 16; |
| return port->uartclk/(baud * divisor); |
| } |
| |
| static void serial_omap_enable_ms(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); |
| |
| pm_runtime_get_sync(up->dev); |
| up->ier |= UART_IER_MSI; |
| serial_out(up, UART_IER, up->ier); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static void serial_omap_stop_tx(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| pm_runtime_get_sync(up->dev); |
| if (up->ier & UART_IER_THRI) { |
| up->ier &= ~UART_IER_THRI; |
| serial_out(up, UART_IER, up->ier); |
| } |
| |
| serial_omap_set_forceidle(up); |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static void serial_omap_stop_rx(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| pm_runtime_get_sync(up->dev); |
| up->ier &= ~UART_IER_RLSI; |
| up->port.read_status_mask &= ~UART_LSR_DR; |
| serial_out(up, UART_IER, up->ier); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) |
| { |
| struct circ_buf *xmit = &up->port.state->xmit; |
| int count; |
| |
| if (!(lsr & UART_LSR_THRE)) |
| return; |
| |
| if (up->port.x_char) { |
| serial_out(up, UART_TX, up->port.x_char); |
| up->port.icount.tx++; |
| up->port.x_char = 0; |
| return; |
| } |
| if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { |
| serial_omap_stop_tx(&up->port); |
| return; |
| } |
| count = up->port.fifosize / 4; |
| do { |
| serial_out(up, UART_TX, xmit->buf[xmit->tail]); |
| xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| up->port.icount.tx++; |
| if (uart_circ_empty(xmit)) |
| break; |
| } while (--count > 0); |
| |
| if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { |
| spin_unlock(&up->port.lock); |
| uart_write_wakeup(&up->port); |
| spin_lock(&up->port.lock); |
| } |
| |
| if (uart_circ_empty(xmit)) |
| serial_omap_stop_tx(&up->port); |
| } |
| |
| static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) |
| { |
| if (!(up->ier & UART_IER_THRI)) { |
| up->ier |= UART_IER_THRI; |
| serial_out(up, UART_IER, up->ier); |
| } |
| } |
| |
| static void serial_omap_start_tx(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| pm_runtime_get_sync(up->dev); |
| serial_omap_enable_ier_thri(up); |
| serial_omap_set_noidle(up); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static unsigned int check_modem_status(struct uart_omap_port *up) |
| { |
| unsigned int status; |
| |
| status = serial_in(up, UART_MSR); |
| status |= up->msr_saved_flags; |
| up->msr_saved_flags = 0; |
| if ((status & UART_MSR_ANY_DELTA) == 0) |
| return status; |
| |
| if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && |
| up->port.state != NULL) { |
| if (status & UART_MSR_TERI) |
| up->port.icount.rng++; |
| if (status & UART_MSR_DDSR) |
| up->port.icount.dsr++; |
| if (status & UART_MSR_DDCD) |
| uart_handle_dcd_change |
| (&up->port, status & UART_MSR_DCD); |
| if (status & UART_MSR_DCTS) |
| uart_handle_cts_change |
| (&up->port, status & UART_MSR_CTS); |
| wake_up_interruptible(&up->port.state->port.delta_msr_wait); |
| } |
| |
| return status; |
| } |
| |
| static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr) |
| { |
| unsigned int flag; |
| unsigned char ch = 0; |
| |
| if (likely(lsr & UART_LSR_DR)) |
| ch = serial_in(up, UART_RX); |
| |
| up->port.icount.rx++; |
| flag = TTY_NORMAL; |
| |
| if (lsr & UART_LSR_BI) { |
| flag = TTY_BREAK; |
| lsr &= ~(UART_LSR_FE | UART_LSR_PE); |
| up->port.icount.brk++; |
| /* |
| * We do the SysRQ and SAK checking |
| * here because otherwise the break |
| * may get masked by ignore_status_mask |
| * or read_status_mask. |
| */ |
| if (uart_handle_break(&up->port)) |
| return; |
| |
| } |
| |
| if (lsr & UART_LSR_PE) { |
| flag = TTY_PARITY; |
| up->port.icount.parity++; |
| } |
| |
| if (lsr & UART_LSR_FE) { |
| flag = TTY_FRAME; |
| up->port.icount.frame++; |
| } |
| |
| if (lsr & UART_LSR_OE) |
| up->port.icount.overrun++; |
| |
| #ifdef CONFIG_SERIAL_OMAP_CONSOLE |
| if (up->port.line == up->port.cons->index) { |
| /* Recover the break flag from console xmit */ |
| lsr |= up->lsr_break_flag; |
| } |
| #endif |
| uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag); |
| } |
| |
| static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr) |
| { |
| unsigned char ch = 0; |
| unsigned int flag; |
| |
| if (!(lsr & UART_LSR_DR)) |
| return; |
| |
| ch = serial_in(up, UART_RX); |
| flag = TTY_NORMAL; |
| up->port.icount.rx++; |
| |
| if (uart_handle_sysrq_char(&up->port, ch)) |
| return; |
| |
| uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); |
| } |
| |
| /** |
| * serial_omap_irq() - This handles the interrupt from one port |
| * @irq: uart port irq number |
| * @dev_id: uart port info |
| */ |
| static irqreturn_t serial_omap_irq(int irq, void *dev_id) |
| { |
| struct uart_omap_port *up = dev_id; |
| struct tty_struct *tty = up->port.state->port.tty; |
| unsigned int iir, lsr; |
| unsigned int type; |
| irqreturn_t ret = IRQ_NONE; |
| int max_count = 256; |
| |
| spin_lock(&up->port.lock); |
| pm_runtime_get_sync(up->dev); |
| |
| do { |
| iir = serial_in(up, UART_IIR); |
| if (iir & UART_IIR_NO_INT) |
| break; |
| |
| ret = IRQ_HANDLED; |
| lsr = serial_in(up, UART_LSR); |
| |
| /* extract IRQ type from IIR register */ |
| type = iir & 0x3e; |
| |
| switch (type) { |
| case UART_IIR_MSI: |
| check_modem_status(up); |
| break; |
| case UART_IIR_THRI: |
| transmit_chars(up, lsr); |
| break; |
| case UART_IIR_RX_TIMEOUT: |
| /* FALLTHROUGH */ |
| case UART_IIR_RDI: |
| serial_omap_rdi(up, lsr); |
| break; |
| case UART_IIR_RLSI: |
| serial_omap_rlsi(up, lsr); |
| break; |
| case UART_IIR_CTS_RTS_DSR: |
| /* simply try again */ |
| break; |
| case UART_IIR_XOFF: |
| /* FALLTHROUGH */ |
| default: |
| break; |
| } |
| } while (!(iir & UART_IIR_NO_INT) && max_count--); |
| |
| spin_unlock(&up->port.lock); |
| |
| tty_flip_buffer_push(tty); |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| up->port_activity = jiffies; |
| |
| return ret; |
| } |
| |
| static unsigned int serial_omap_tx_empty(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned long flags = 0; |
| unsigned int ret = 0; |
| |
| pm_runtime_get_sync(up->dev); |
| dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); |
| spin_lock_irqsave(&up->port.lock, flags); |
| ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; |
| spin_unlock_irqrestore(&up->port.lock, flags); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| return ret; |
| } |
| |
| static unsigned int serial_omap_get_mctrl(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned int status; |
| unsigned int ret = 0; |
| |
| pm_runtime_get_sync(up->dev); |
| status = check_modem_status(up); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| |
| dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); |
| |
| if (status & UART_MSR_DCD) |
| ret |= TIOCM_CAR; |
| if (status & UART_MSR_RI) |
| ret |= TIOCM_RNG; |
| if (status & UART_MSR_DSR) |
| ret |= TIOCM_DSR; |
| if (status & UART_MSR_CTS) |
| ret |= TIOCM_CTS; |
| return ret; |
| } |
| |
| static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned char mcr = 0, old_mcr; |
| |
| dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); |
| if (mctrl & TIOCM_RTS) |
| mcr |= UART_MCR_RTS; |
| if (mctrl & TIOCM_DTR) |
| mcr |= UART_MCR_DTR; |
| if (mctrl & TIOCM_OUT1) |
| mcr |= UART_MCR_OUT1; |
| if (mctrl & TIOCM_OUT2) |
| mcr |= UART_MCR_OUT2; |
| if (mctrl & TIOCM_LOOP) |
| mcr |= UART_MCR_LOOP; |
| |
| pm_runtime_get_sync(up->dev); |
| old_mcr = serial_in(up, UART_MCR); |
| old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 | |
| UART_MCR_DTR | UART_MCR_RTS); |
| up->mcr = old_mcr | mcr; |
| serial_out(up, UART_MCR, up->mcr); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| |
| if (gpio_is_valid(up->DTR_gpio) && |
| !!(mctrl & TIOCM_DTR) != up->DTR_active) { |
| up->DTR_active = !up->DTR_active; |
| if (gpio_cansleep(up->DTR_gpio)) |
| schedule_work(&up->qos_work); |
| else |
| gpio_set_value(up->DTR_gpio, |
| up->DTR_active != up->DTR_inverted); |
| } |
| } |
| |
| static void serial_omap_break_ctl(struct uart_port *port, int break_state) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned long flags = 0; |
| |
| dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); |
| pm_runtime_get_sync(up->dev); |
| spin_lock_irqsave(&up->port.lock, flags); |
| if (break_state == -1) |
| up->lcr |= UART_LCR_SBC; |
| else |
| up->lcr &= ~UART_LCR_SBC; |
| serial_out(up, UART_LCR, up->lcr); |
| spin_unlock_irqrestore(&up->port.lock, flags); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static int serial_omap_startup(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned long flags = 0; |
| int retval; |
| |
| /* |
| * Allocate the IRQ |
| */ |
| retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, |
| up->name, up); |
| if (retval) |
| return retval; |
| |
| dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); |
| |
| pm_runtime_get_sync(up->dev); |
| /* |
| * Clear the FIFO buffers and disable them. |
| * (they will be reenabled in set_termios()) |
| */ |
| serial_omap_clear_fifos(up); |
| /* For Hardware flow control */ |
| serial_out(up, UART_MCR, UART_MCR_RTS); |
| |
| /* |
| * Clear the interrupt registers. |
| */ |
| (void) serial_in(up, UART_LSR); |
| if (serial_in(up, UART_LSR) & UART_LSR_DR) |
| (void) serial_in(up, UART_RX); |
| (void) serial_in(up, UART_IIR); |
| (void) serial_in(up, UART_MSR); |
| |
| /* |
| * Now, initialize the UART |
| */ |
| serial_out(up, UART_LCR, UART_LCR_WLEN8); |
| spin_lock_irqsave(&up->port.lock, flags); |
| /* |
| * Most PC uarts need OUT2 raised to enable interrupts. |
| */ |
| up->port.mctrl |= TIOCM_OUT2; |
| serial_omap_set_mctrl(&up->port, up->port.mctrl); |
| spin_unlock_irqrestore(&up->port.lock, flags); |
| |
| up->msr_saved_flags = 0; |
| /* |
| * Finally, enable interrupts. Note: Modem status interrupts |
| * are set via set_termios(), which will be occurring imminently |
| * anyway, so we don't enable them here. |
| */ |
| up->ier = UART_IER_RLSI | UART_IER_RDI; |
| serial_out(up, UART_IER, up->ier); |
| |
| /* Enable module level wake up */ |
| serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP); |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| up->port_activity = jiffies; |
| return 0; |
| } |
| |
| static void serial_omap_shutdown(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned long flags = 0; |
| |
| dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); |
| |
| pm_runtime_get_sync(up->dev); |
| /* |
| * Disable interrupts from this port |
| */ |
| up->ier = 0; |
| serial_out(up, UART_IER, 0); |
| |
| spin_lock_irqsave(&up->port.lock, flags); |
| up->port.mctrl &= ~TIOCM_OUT2; |
| serial_omap_set_mctrl(&up->port, up->port.mctrl); |
| spin_unlock_irqrestore(&up->port.lock, flags); |
| |
| /* |
| * Disable break condition and FIFOs |
| */ |
| serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); |
| serial_omap_clear_fifos(up); |
| |
| /* |
| * Read data port to reset things, and then free the irq |
| */ |
| if (serial_in(up, UART_LSR) & UART_LSR_DR) |
| (void) serial_in(up, UART_RX); |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| free_irq(up->port.irq, up); |
| } |
| |
| static inline void |
| serial_omap_configure_xonxoff |
| (struct uart_omap_port *up, struct ktermios *termios) |
| { |
| up->lcr = serial_in(up, UART_LCR); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| up->efr = serial_in(up, UART_EFR); |
| serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); |
| |
| serial_out(up, UART_XON1, termios->c_cc[VSTART]); |
| serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); |
| |
| /* clear SW control mode bits */ |
| up->efr &= OMAP_UART_SW_CLR; |
| |
| /* |
| * IXON Flag: |
| * Enable XON/XOFF flow control on output. |
| * Transmit XON1, XOFF1 |
| */ |
| if (termios->c_iflag & IXON) |
| up->efr |= OMAP_UART_SW_TX; |
| |
| /* |
| * IXOFF Flag: |
| * Enable XON/XOFF flow control on input. |
| * Receiver compares XON1, XOFF1. |
| */ |
| if (termios->c_iflag & IXOFF) |
| up->efr |= OMAP_UART_SW_RX; |
| |
| serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| |
| up->mcr = serial_in(up, UART_MCR); |
| |
| /* |
| * IXANY Flag: |
| * Enable any character to restart output. |
| * Operation resumes after receiving any |
| * character after recognition of the XOFF character |
| */ |
| if (termios->c_iflag & IXANY) |
| up->mcr |= UART_MCR_XONANY; |
| else |
| up->mcr &= ~UART_MCR_XONANY; |
| |
| serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, up->efr); |
| serial_out(up, UART_LCR, up->lcr); |
| } |
| |
| static void serial_omap_uart_qos_work(struct work_struct *work) |
| { |
| struct uart_omap_port *up = container_of(work, struct uart_omap_port, |
| qos_work); |
| |
| pm_qos_update_request(&up->pm_qos_request, up->latency); |
| if (gpio_is_valid(up->DTR_gpio)) |
| gpio_set_value_cansleep(up->DTR_gpio, |
| up->DTR_active != up->DTR_inverted); |
| } |
| |
| static void |
| serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, |
| struct ktermios *old) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned char cval = 0; |
| unsigned long flags = 0; |
| unsigned int baud, quot; |
| |
| switch (termios->c_cflag & CSIZE) { |
| case CS5: |
| cval = UART_LCR_WLEN5; |
| break; |
| case CS6: |
| cval = UART_LCR_WLEN6; |
| break; |
| case CS7: |
| cval = UART_LCR_WLEN7; |
| break; |
| default: |
| case CS8: |
| cval = UART_LCR_WLEN8; |
| break; |
| } |
| |
| if (termios->c_cflag & CSTOPB) |
| cval |= UART_LCR_STOP; |
| if (termios->c_cflag & PARENB) |
| cval |= UART_LCR_PARITY; |
| if (!(termios->c_cflag & PARODD)) |
| cval |= UART_LCR_EPAR; |
| |
| /* |
| * Ask the core to calculate the divisor for us. |
| */ |
| |
| baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); |
| quot = serial_omap_get_divisor(port, baud); |
| |
| /* calculate wakeup latency constraint */ |
| up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8); |
| up->latency = up->calc_latency; |
| schedule_work(&up->qos_work); |
| |
| up->dll = quot & 0xff; |
| up->dlh = quot >> 8; |
| up->mdr1 = UART_OMAP_MDR1_DISABLE; |
| |
| up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | |
| UART_FCR_ENABLE_FIFO; |
| |
| /* |
| * Ok, we're now changing the port state. Do it with |
| * interrupts disabled. |
| */ |
| pm_runtime_get_sync(up->dev); |
| spin_lock_irqsave(&up->port.lock, flags); |
| |
| /* |
| * Update the per-port timeout. |
| */ |
| uart_update_timeout(port, termios->c_cflag, baud); |
| |
| up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
| if (termios->c_iflag & INPCK) |
| up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
| if (termios->c_iflag & (BRKINT | PARMRK)) |
| up->port.read_status_mask |= UART_LSR_BI; |
| |
| /* |
| * Characters to ignore |
| */ |
| up->port.ignore_status_mask = 0; |
| if (termios->c_iflag & IGNPAR) |
| up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| if (termios->c_iflag & IGNBRK) { |
| up->port.ignore_status_mask |= UART_LSR_BI; |
| /* |
| * If we're ignoring parity and break indicators, |
| * ignore overruns too (for real raw support). |
| */ |
| if (termios->c_iflag & IGNPAR) |
| up->port.ignore_status_mask |= UART_LSR_OE; |
| } |
| |
| /* |
| * ignore all characters if CREAD is not set |
| */ |
| if ((termios->c_cflag & CREAD) == 0) |
| up->port.ignore_status_mask |= UART_LSR_DR; |
| |
| /* |
| * Modem status interrupts |
| */ |
| up->ier &= ~UART_IER_MSI; |
| if (UART_ENABLE_MS(&up->port, termios->c_cflag)) |
| up->ier |= UART_IER_MSI; |
| serial_out(up, UART_IER, up->ier); |
| serial_out(up, UART_LCR, cval); /* reset DLAB */ |
| up->lcr = cval; |
| up->scr = OMAP_UART_SCR_TX_EMPTY; |
| |
| /* FIFOs and DMA Settings */ |
| |
| /* FCR can be changed only when the |
| * baud clock is not running |
| * DLL_REG and DLH_REG set to 0. |
| */ |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| serial_out(up, UART_DLL, 0); |
| serial_out(up, UART_DLM, 0); |
| serial_out(up, UART_LCR, 0); |
| |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| |
| up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB; |
| up->efr &= ~UART_EFR_SCD; |
| serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); |
| |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR; |
| serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); |
| /* FIFO ENABLE, DMA MODE */ |
| |
| up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; |
| |
| /* Set receive FIFO threshold to 16 characters and |
| * transmit FIFO threshold to 16 spaces |
| */ |
| up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; |
| up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK; |
| up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 | |
| UART_FCR_ENABLE_FIFO; |
| |
| serial_out(up, UART_FCR, up->fcr); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| |
| serial_out(up, UART_OMAP_SCR, up->scr); |
| |
| /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */ |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| serial_out(up, UART_MCR, up->mcr); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, up->efr); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| |
| /* Protocol, Baud Rate, and Interrupt Settings */ |
| |
| if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) |
| serial_omap_mdr1_errataset(up, up->mdr1); |
| else |
| serial_out(up, UART_OMAP_MDR1, up->mdr1); |
| |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); |
| |
| serial_out(up, UART_LCR, 0); |
| serial_out(up, UART_IER, 0); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| |
| serial_out(up, UART_DLL, up->dll); /* LS of divisor */ |
| serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ |
| |
| serial_out(up, UART_LCR, 0); |
| serial_out(up, UART_IER, up->ier); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| |
| serial_out(up, UART_EFR, up->efr); |
| serial_out(up, UART_LCR, cval); |
| |
| if (baud > 230400 && baud != 3000000) |
| up->mdr1 = UART_OMAP_MDR1_13X_MODE; |
| else |
| up->mdr1 = UART_OMAP_MDR1_16X_MODE; |
| |
| if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) |
| serial_omap_mdr1_errataset(up, up->mdr1); |
| else |
| serial_out(up, UART_OMAP_MDR1, up->mdr1); |
| |
| /* Hardware Flow Control Configuration */ |
| |
| if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) { |
| /* Enable access to TCR/TLR */ |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); |
| |
| serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); |
| |
| /* Enable AUTORTS and AUTOCTS */ |
| up->efr |= UART_EFR_CTS | UART_EFR_RTS; |
| |
| /* Disable access to TCR/TLR */ |
| serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, up->efr); |
| serial_out(up, UART_LCR, cval); |
| } else { |
| /* Disable AUTORTS and AUTOCTS */ |
| up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS); |
| |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, up->efr); |
| serial_out(up, UART_LCR, cval); |
| } |
| |
| /* Software Flow Control Configuration */ |
| if (up->port.flags & UPF_SOFT_FLOW) |
| serial_omap_configure_xonxoff(up, termios); |
| |
| serial_omap_set_mctrl(&up->port, up->port.mctrl); |
| |
| spin_unlock_irqrestore(&up->port.lock, flags); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); |
| } |
| |
| static int serial_omap_set_wake(struct uart_port *port, unsigned int state) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| serial_omap_enable_wakeup(up, state); |
| |
| return 0; |
| } |
| |
| static void |
| serial_omap_pm(struct uart_port *port, unsigned int state, |
| unsigned int oldstate) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned char efr; |
| |
| dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); |
| |
| pm_runtime_get_sync(up->dev); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| efr = serial_in(up, UART_EFR); |
| serial_out(up, UART_EFR, efr | UART_EFR_ECB); |
| serial_out(up, UART_LCR, 0); |
| |
| serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| serial_out(up, UART_EFR, efr); |
| serial_out(up, UART_LCR, 0); |
| |
| if (!device_may_wakeup(up->dev)) { |
| if (!state) |
| pm_runtime_forbid(up->dev); |
| else |
| pm_runtime_allow(up->dev); |
| } |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static void serial_omap_release_port(struct uart_port *port) |
| { |
| dev_dbg(port->dev, "serial_omap_release_port+\n"); |
| } |
| |
| static int serial_omap_request_port(struct uart_port *port) |
| { |
| dev_dbg(port->dev, "serial_omap_request_port+\n"); |
| return 0; |
| } |
| |
| static void serial_omap_config_port(struct uart_port *port, int flags) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", |
| up->port.line); |
| up->port.type = PORT_OMAP; |
| } |
| |
| static int |
| serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) |
| { |
| /* we don't want the core code to modify any port params */ |
| dev_dbg(port->dev, "serial_omap_verify_port+\n"); |
| return -EINVAL; |
| } |
| |
| static const char * |
| serial_omap_type(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); |
| return up->name; |
| } |
| |
| #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
| |
| static inline void wait_for_xmitr(struct uart_omap_port *up) |
| { |
| unsigned int status, tmout = 10000; |
| |
| /* Wait up to 10ms for the character(s) to be sent. */ |
| do { |
| status = serial_in(up, UART_LSR); |
| |
| if (status & UART_LSR_BI) |
| up->lsr_break_flag = UART_LSR_BI; |
| |
| if (--tmout == 0) |
| break; |
| udelay(1); |
| } while ((status & BOTH_EMPTY) != BOTH_EMPTY); |
| |
| /* Wait up to 1s for flow control if necessary */ |
| if (up->port.flags & UPF_CONS_FLOW) { |
| tmout = 1000000; |
| for (tmout = 1000000; tmout; tmout--) { |
| unsigned int msr = serial_in(up, UART_MSR); |
| |
| up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; |
| if (msr & UART_MSR_CTS) |
| break; |
| |
| udelay(1); |
| } |
| } |
| } |
| |
| #ifdef CONFIG_CONSOLE_POLL |
| |
| static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| pm_runtime_get_sync(up->dev); |
| wait_for_xmitr(up); |
| serial_out(up, UART_TX, ch); |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| } |
| |
| static int serial_omap_poll_get_char(struct uart_port *port) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| unsigned int status; |
| |
| pm_runtime_get_sync(up->dev); |
| status = serial_in(up, UART_LSR); |
| if (!(status & UART_LSR_DR)) { |
| status = NO_POLL_CHAR; |
| goto out; |
| } |
| |
| status = serial_in(up, UART_RX); |
| |
| out: |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| |
| return status; |
| } |
| |
| #endif /* CONFIG_CONSOLE_POLL */ |
| |
| #ifdef CONFIG_SERIAL_OMAP_CONSOLE |
| |
| static struct uart_omap_port *serial_omap_console_ports[4]; |
| |
| static struct uart_driver serial_omap_reg; |
| |
| static void serial_omap_console_putchar(struct uart_port *port, int ch) |
| { |
| struct uart_omap_port *up = to_uart_omap_port(port); |
| |
| wait_for_xmitr(up); |
| serial_out(up, UART_TX, ch); |
| } |
| |
| static void |
| serial_omap_console_write(struct console *co, const char *s, |
| unsigned int count) |
| { |
| struct uart_omap_port *up = serial_omap_console_ports[co->index]; |
| unsigned long flags; |
| unsigned int ier; |
| int locked = 1; |
| |
| pm_runtime_get_sync(up->dev); |
| |
| local_irq_save(flags); |
| if (up->port.sysrq) |
| locked = 0; |
| else if (oops_in_progress) |
| locked = spin_trylock(&up->port.lock); |
| else |
| spin_lock(&up->port.lock); |
| |
| /* |
| * First save the IER then disable the interrupts |
| */ |
| ier = serial_in(up, UART_IER); |
| serial_out(up, UART_IER, 0); |
| |
| uart_console_write(&up->port, s, count, serial_omap_console_putchar); |
| |
| /* |
| * Finally, wait for transmitter to become empty |
| * and restore the IER |
| */ |
| wait_for_xmitr(up); |
| serial_out(up, UART_IER, ier); |
| /* |
| * The receive handling will happen properly because the |
| * receive ready bit will still be set; it is not cleared |
| * on read. However, modem control will not, we must |
| * call it if we have saved something in the saved flags |
| * while processing with interrupts off. |
| */ |
| if (up->msr_saved_flags) |
| check_modem_status(up); |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| if (locked) |
| spin_unlock(&up->port.lock); |
| local_irq_restore(flags); |
| } |
| |
| static int __init |
| serial_omap_console_setup(struct console *co, char *options) |
| { |
| struct uart_omap_port *up; |
| int baud = 115200; |
| int bits = 8; |
| int parity = 'n'; |
| int flow = 'n'; |
| |
| if (serial_omap_console_ports[co->index] == NULL) |
| return -ENODEV; |
| up = serial_omap_console_ports[co->index]; |
| |
| if (options) |
| uart_parse_options(options, &baud, &parity, &bits, &flow); |
| |
| return uart_set_options(&up->port, co, baud, parity, bits, flow); |
| } |
| |
| static struct console serial_omap_console = { |
| .name = OMAP_SERIAL_NAME, |
| .write = serial_omap_console_write, |
| .device = uart_console_device, |
| .setup = serial_omap_console_setup, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| .data = &serial_omap_reg, |
| }; |
| |
| static void serial_omap_add_console_port(struct uart_omap_port *up) |
| { |
| serial_omap_console_ports[up->port.line] = up; |
| } |
| |
| #define OMAP_CONSOLE (&serial_omap_console) |
| |
| #else |
| |
| #define OMAP_CONSOLE NULL |
| |
| static inline void serial_omap_add_console_port(struct uart_omap_port *up) |
| {} |
| |
| #endif |
| |
| static struct uart_ops serial_omap_pops = { |
| .tx_empty = serial_omap_tx_empty, |
| .set_mctrl = serial_omap_set_mctrl, |
| .get_mctrl = serial_omap_get_mctrl, |
| .stop_tx = serial_omap_stop_tx, |
| .start_tx = serial_omap_start_tx, |
| .stop_rx = serial_omap_stop_rx, |
| .enable_ms = serial_omap_enable_ms, |
| .break_ctl = serial_omap_break_ctl, |
| .startup = serial_omap_startup, |
| .shutdown = serial_omap_shutdown, |
| .set_termios = serial_omap_set_termios, |
| .pm = serial_omap_pm, |
| .set_wake = serial_omap_set_wake, |
| .type = serial_omap_type, |
| .release_port = serial_omap_release_port, |
| .request_port = serial_omap_request_port, |
| .config_port = serial_omap_config_port, |
| .verify_port = serial_omap_verify_port, |
| #ifdef CONFIG_CONSOLE_POLL |
| .poll_put_char = serial_omap_poll_put_char, |
| .poll_get_char = serial_omap_poll_get_char, |
| #endif |
| }; |
| |
| static struct uart_driver serial_omap_reg = { |
| .owner = THIS_MODULE, |
| .driver_name = "OMAP-SERIAL", |
| .dev_name = OMAP_SERIAL_NAME, |
| .nr = OMAP_MAX_HSUART_PORTS, |
| .cons = OMAP_CONSOLE, |
| }; |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int serial_omap_suspend(struct device *dev) |
| { |
| struct uart_omap_port *up = dev_get_drvdata(dev); |
| |
| uart_suspend_port(&serial_omap_reg, &up->port); |
| flush_work(&up->qos_work); |
| |
| return 0; |
| } |
| |
| static int serial_omap_resume(struct device *dev) |
| { |
| struct uart_omap_port *up = dev_get_drvdata(dev); |
| |
| uart_resume_port(&serial_omap_reg, &up->port); |
| |
| return 0; |
| } |
| #endif |
| |
| static void __devinit omap_serial_fill_features_erratas(struct uart_omap_port *up) |
| { |
| u32 mvr, scheme; |
| u16 revision, major, minor; |
| |
| mvr = serial_in(up, UART_OMAP_MVER); |
| |
| /* Check revision register scheme */ |
| scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT; |
| |
| switch (scheme) { |
| case 0: /* Legacy Scheme: OMAP2/3 */ |
| /* MINOR_REV[0:4], MAJOR_REV[4:7] */ |
| major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >> |
| OMAP_UART_LEGACY_MVR_MAJ_SHIFT; |
| minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK); |
| break; |
| case 1: |
| /* New Scheme: OMAP4+ */ |
| /* MINOR_REV[0:5], MAJOR_REV[8:10] */ |
| major = (mvr & OMAP_UART_MVR_MAJ_MASK) >> |
| OMAP_UART_MVR_MAJ_SHIFT; |
| minor = (mvr & OMAP_UART_MVR_MIN_MASK); |
| break; |
| default: |
| dev_warn(up->dev, |
| "Unknown %s revision, defaulting to highest\n", |
| up->name); |
| /* highest possible revision */ |
| major = 0xff; |
| minor = 0xff; |
| } |
| |
| /* normalize revision for the driver */ |
| revision = UART_BUILD_REVISION(major, minor); |
| |
| switch (revision) { |
| case OMAP_UART_REV_46: |
| up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | |
| UART_ERRATA_i291_DMA_FORCEIDLE); |
| break; |
| case OMAP_UART_REV_52: |
| up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | |
| UART_ERRATA_i291_DMA_FORCEIDLE); |
| break; |
| case OMAP_UART_REV_63: |
| up->errata |= UART_ERRATA_i202_MDR1_ACCESS; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static __devinit struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) |
| { |
| struct omap_uart_port_info *omap_up_info; |
| |
| omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); |
| if (!omap_up_info) |
| return NULL; /* out of memory */ |
| |
| of_property_read_u32(dev->of_node, "clock-frequency", |
| &omap_up_info->uartclk); |
| return omap_up_info; |
| } |
| |
| static int __devinit serial_omap_probe(struct platform_device *pdev) |
| { |
| struct uart_omap_port *up; |
| struct resource *mem, *irq; |
| struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; |
| int ret; |
| |
| if (pdev->dev.of_node) |
| omap_up_info = of_get_uart_port_info(&pdev->dev); |
| |
| mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!mem) { |
| dev_err(&pdev->dev, "no mem resource?\n"); |
| return -ENODEV; |
| } |
| |
| irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (!irq) { |
| dev_err(&pdev->dev, "no irq resource?\n"); |
| return -ENODEV; |
| } |
| |
| if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem), |
| pdev->dev.driver->name)) { |
| dev_err(&pdev->dev, "memory region already claimed\n"); |
| return -EBUSY; |
| } |
| |
| if (gpio_is_valid(omap_up_info->DTR_gpio) && |
| omap_up_info->DTR_present) { |
| ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial"); |
| if (ret < 0) |
| return ret; |
| ret = gpio_direction_output(omap_up_info->DTR_gpio, |
| omap_up_info->DTR_inverted); |
| if (ret < 0) |
| return ret; |
| } |
| |
| up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); |
| if (!up) |
| return -ENOMEM; |
| |
| if (gpio_is_valid(omap_up_info->DTR_gpio) && |
| omap_up_info->DTR_present) { |
| up->DTR_gpio = omap_up_info->DTR_gpio; |
| up->DTR_inverted = omap_up_info->DTR_inverted; |
| } else |
| up->DTR_gpio = -EINVAL; |
| up->DTR_active = 0; |
| |
| up->dev = &pdev->dev; |
| up->port.dev = &pdev->dev; |
| up->port.type = PORT_OMAP; |
| up->port.iotype = UPIO_MEM; |
| up->port.irq = irq->start; |
| |
| up->port.regshift = 2; |
| up->port.fifosize = 64; |
| up->port.ops = &serial_omap_pops; |
| |
| if (pdev->dev.of_node) |
| up->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); |
| else |
| up->port.line = pdev->id; |
| |
| if (up->port.line < 0) { |
| dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", |
| up->port.line); |
| ret = -ENODEV; |
| goto err_port_line; |
| } |
| |
| up->pins = devm_pinctrl_get_select_default(&pdev->dev); |
| if (IS_ERR(up->pins)) { |
| dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n", |
| up->port.line, PTR_ERR(up->pins)); |
| up->pins = NULL; |
| } |
| |
| sprintf(up->name, "OMAP UART%d", up->port.line); |
| up->port.mapbase = mem->start; |
| up->port.membase = devm_ioremap(&pdev->dev, mem->start, |
| resource_size(mem)); |
| if (!up->port.membase) { |
| dev_err(&pdev->dev, "can't ioremap UART\n"); |
| ret = -ENOMEM; |
| goto err_ioremap; |
| } |
| |
| up->port.flags = omap_up_info->flags; |
| up->port.uartclk = omap_up_info->uartclk; |
| if (!up->port.uartclk) { |
| up->port.uartclk = DEFAULT_CLK_SPEED; |
| dev_warn(&pdev->dev, "No clock speed specified: using default:" |
| "%d\n", DEFAULT_CLK_SPEED); |
| } |
| |
| up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; |
| up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; |
| pm_qos_add_request(&up->pm_qos_request, |
| PM_QOS_CPU_DMA_LATENCY, up->latency); |
| serial_omap_uart_wq = create_singlethread_workqueue(up->name); |
| INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); |
| |
| platform_set_drvdata(pdev, up); |
| pm_runtime_enable(&pdev->dev); |
| pm_runtime_use_autosuspend(&pdev->dev); |
| pm_runtime_set_autosuspend_delay(&pdev->dev, |
| omap_up_info->autosuspend_timeout); |
| |
| pm_runtime_irq_safe(&pdev->dev); |
| pm_runtime_get_sync(&pdev->dev); |
| |
| omap_serial_fill_features_erratas(up); |
| |
| ui[up->port.line] = up; |
| serial_omap_add_console_port(up); |
| |
| ret = uart_add_one_port(&serial_omap_reg, &up->port); |
| if (ret != 0) |
| goto err_add_port; |
| |
| pm_runtime_mark_last_busy(up->dev); |
| pm_runtime_put_autosuspend(up->dev); |
| return 0; |
| |
| err_add_port: |
| pm_runtime_put(&pdev->dev); |
| pm_runtime_disable(&pdev->dev); |
| err_ioremap: |
| err_port_line: |
| dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", |
| pdev->id, __func__, ret); |
| return ret; |
| } |
| |
| static int __devexit serial_omap_remove(struct platform_device *dev) |
| { |
| struct uart_omap_port *up = platform_get_drvdata(dev); |
| |
| pm_runtime_put_sync(up->dev); |
| pm_runtime_disable(up->dev); |
| uart_remove_one_port(&serial_omap_reg, &up->port); |
| pm_qos_remove_request(&up->pm_qos_request); |
| |
| return 0; |
| } |
| |
| /* |
| * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) |
| * The access to uart register after MDR1 Access |
| * causes UART to corrupt data. |
| * |
| * Need a delay = |
| * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) |
| * give 10 times as much |
| */ |
| static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) |
| { |
| u8 timeout = 255; |
| |
| serial_out(up, UART_OMAP_MDR1, mdr1); |
| udelay(2); |
| serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | |
| UART_FCR_CLEAR_RCVR); |
| /* |
| * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and |
| * TX_FIFO_E bit is 1. |
| */ |
| while (UART_LSR_THRE != (serial_in(up, UART_LSR) & |
| (UART_LSR_THRE | UART_LSR_DR))) { |
| timeout--; |
| if (!timeout) { |
| /* Should *never* happen. we warn and carry on */ |
| dev_crit(up->dev, "Errata i202: timedout %x\n", |
| serial_in(up, UART_LSR)); |
| break; |
| } |
| udelay(1); |
| } |
| } |
| |
| #ifdef CONFIG_PM_RUNTIME |
| static void serial_omap_restore_context(struct uart_omap_port *up) |
| { |
| if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) |
| serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); |
| else |
| serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); |
| |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ |
| serial_out(up, UART_EFR, UART_EFR_ECB); |
| serial_out(up, UART_LCR, 0x0); /* Operational mode */ |
| serial_out(up, UART_IER, 0x0); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ |
| serial_out(up, UART_DLL, up->dll); |
| serial_out(up, UART_DLM, up->dlh); |
| serial_out(up, UART_LCR, 0x0); /* Operational mode */ |
| serial_out(up, UART_IER, up->ier); |
| serial_out(up, UART_FCR, up->fcr); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| serial_out(up, UART_MCR, up->mcr); |
| serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ |
| serial_out(up, UART_OMAP_SCR, up->scr); |
| serial_out(up, UART_EFR, up->efr); |
| serial_out(up, UART_LCR, up->lcr); |
| if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) |
| serial_omap_mdr1_errataset(up, up->mdr1); |
| else |
| serial_out(up, UART_OMAP_MDR1, up->mdr1); |
| } |
| |
| static int serial_omap_runtime_suspend(struct device *dev) |
| { |
| struct uart_omap_port *up = dev_get_drvdata(dev); |
| struct omap_uart_port_info *pdata = dev->platform_data; |
| |
| if (!up) |
| return -EINVAL; |
| |
| if (!pdata) |
| return 0; |
| |
| up->context_loss_cnt = serial_omap_get_context_loss_count(up); |
| |
| if (device_may_wakeup(dev)) { |
| if (!up->wakeups_enabled) { |
| serial_omap_enable_wakeup(up, true); |
| up->wakeups_enabled = true; |
| } |
| } else { |
| if (up->wakeups_enabled) { |
| serial_omap_enable_wakeup(up, false); |
| up->wakeups_enabled = false; |
| } |
| } |
| |
| up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; |
| schedule_work(&up->qos_work); |
| |
| return 0; |
| } |
| |
| static int serial_omap_runtime_resume(struct device *dev) |
| { |
| struct uart_omap_port *up = dev_get_drvdata(dev); |
| |
| u32 loss_cnt = serial_omap_get_context_loss_count(up); |
| |
| if (up->context_loss_cnt != loss_cnt) |
| serial_omap_restore_context(up); |
| |
| up->latency = up->calc_latency; |
| schedule_work(&up->qos_work); |
| |
| return 0; |
| } |
| #endif |
| |
| static const struct dev_pm_ops serial_omap_dev_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) |
| SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, |
| serial_omap_runtime_resume, NULL) |
| }; |
| |
| #if defined(CONFIG_OF) |
| static const struct of_device_id omap_serial_of_match[] = { |
| { .compatible = "ti,omap2-uart" }, |
| { .compatible = "ti,omap3-uart" }, |
| { .compatible = "ti,omap4-uart" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, omap_serial_of_match); |
| #endif |
| |
| static struct platform_driver serial_omap_driver = { |
| .probe = serial_omap_probe, |
| .remove = __devexit_p(serial_omap_remove), |
| .driver = { |
| .name = DRIVER_NAME, |
| .pm = &serial_omap_dev_pm_ops, |
| .of_match_table = of_match_ptr(omap_serial_of_match), |
| }, |
| }; |
| |
| static int __init serial_omap_init(void) |
| { |
| int ret; |
| |
| ret = uart_register_driver(&serial_omap_reg); |
| if (ret != 0) |
| return ret; |
| ret = platform_driver_register(&serial_omap_driver); |
| if (ret != 0) |
| uart_unregister_driver(&serial_omap_reg); |
| return ret; |
| } |
| |
| static void __exit serial_omap_exit(void) |
| { |
| platform_driver_unregister(&serial_omap_driver); |
| uart_unregister_driver(&serial_omap_reg); |
| } |
| |
| module_init(serial_omap_init); |
| module_exit(serial_omap_exit); |
| |
| MODULE_DESCRIPTION("OMAP High Speed UART driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Texas Instruments Inc"); |