-/*
- * linux/drivers/serial/omap-serial.c
- *
- * Modified: Manasa Gangaiah
- * Copyright (C) 2009 Texas Instrument Inc.
- *
- * Initial driver: Juha Yrjola
- * Copyright (C) 2007 Nokia Corporation
- *
- * Based on drivers/serial/pxa.c by Nicolas Pitre.
- * Copyright (C) 2003 Monta Vista Software, Inc.
- *
- * 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.
- *
- */
-
-#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/platform_device.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_core.h>
-#include <linux/io.h>
-#include <linux/dma-mapping.h>
-#include <linux/wakelock.h>
-#include <linux/workqueue.h>
-
-#include <asm/irq.h>
-#include <asm/dma.h>
-
-#include <plat/dmtimer.h>
-#include <plat/omap-serial.h>
-#include <mach/gpio.h>
-#include <plat/dma.h>
-#include <plat/io.h>
-#ifdef CONFIG_OMAP3_PM
-#include <../arch/arm/mach-omap2/ti-compat.h>
-#include <../arch/arm/mach-omap2/prcm-regs.h>
-#endif
-#include <asm/mach/serial_omap.h>
-
-unsigned long isr8250_activity;
-static int gps_port;
-
-void omap_uart_set_gps_port(int port)
-{
- gps_port = port;
-}
-
-#define CONSOLE_NAME "console="
-
-#ifdef CONFIG_ARCH_OMAP34XX
-#define OMAP_MDR1_DISABLE 0x07
-#define OMAP_MDR1_MODE13X 0x03
-#define OMAP_MDR1_MODE16X 0x00
-#define OMAP_MODE13X_SPEED 230400
-#endif
-
-
-/* Debugging Macros */
-#undef DEBUG
-
-#ifdef DEBUG
-#define DPRINTK printk
-#else
-#define DPRINTK(x...)
-#endif
-
-/*
- * We default to IRQ0 for the "no irq" hack. Some
- * machine types want others as well - they're free
- * to redefine this in their header file.
- */
-#define is_real_interrupt(irq) ((irq) != 0)
-
-/* TBD: move this to header file */
-static u8 uart_dma_tx[MAX_UARTS + 1] =
- { OMAP24XX_DMA_UART1_TX, OMAP24XX_DMA_UART2_TX, OMAP24XX_DMA_UART3_TX };
-static u8 uart_dma_rx[MAX_UARTS + 1] =
- { OMAP24XX_DMA_UART1_RX, OMAP24XX_DMA_UART2_RX, OMAP24XX_DMA_UART3_RX };
-
-
-struct uart_omap_dma {
- int rx_dma_channel;
- int tx_dma_channel;
- dma_addr_t rx_buf_dma_phys; /* Physical adress of RX DMA buffer */
- dma_addr_t tx_buf_dma_phys; /* Physical adress of TX DMA buffer */
- /*
- * 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_state;
- int rx_dma_state;
- spinlock_t tx_lock;
- spinlock_t rx_lock;
- struct timer_list rx_timer;/* timer to poll activity on rx dma */
- int rx_buf_size;
- int rx_timeout;
-};
-
-struct uart_omap_port {
- struct uart_port port;
- struct uart_omap_dma uart_dma;
- struct platform_device *pdev;
-
- unsigned char ier;
- unsigned char lcr;
- unsigned char mcr;
- int use_dma;
- int is_buf_dma_alloced;
- int restore_autorts;
- /*
- * 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;
-#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
- unsigned char msr_saved_flags;
- char name[12];
- int use_console;
- spinlock_t uart_lock;
- char dev_name[50];
-#ifdef CONFIG_SERIAL_OMAP3430_HW_FLOW_CONTROL
- unsigned char ctsrts;
-#endif
- struct work_struct tty_work;
-};
-
-static struct uart_omap_port *ui[MAX_UARTS + 1];
-unsigned int fcr[MAX_UARTS];
-
-static struct wake_lock omap_serial_wakelock;
-static struct workqueue_struct *omap_serial_workqueue;
-
-/* Forward declaration of dma callback functions */
-static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
-static void serial_omap_display_reg(struct uart_port *port);
-static void serial_omap_rx_timeout(unsigned long uart_no);
-static void serial_omap_start_rxdma(struct uart_omap_port *up);
-static void serial_omap_set_autorts(struct uart_omap_port *p, int set);
-
-#define DBG_RX_DATA 0
-
-int console_detect(char *str)
-{
- char *next, *start = NULL;
- int i;
-
- i = strlen(CONSOLE_NAME);
- next = "console=ttyS2,115200";
-
- while ((next = strchr(next, 'c')) != NULL) {
- if (!strncmp(next, CONSOLE_NAME, i)) {
- start = next;
- break;
- } else {
- next++;
- }
-
- }
- if (!start)
- return -EPERM;
- i = 0;
- start = strchr(start, '=') + 1;
- while (*start != ',') {
- str[i++] = *start++;
- if (i > 6) {
- printk(KERN_ERR "Invalid Console Name\n");
- return -EPERM;
- }
- }
- str[i] = '\0';
- return 0;
-}
-
-static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
-{
- offset <<= up->port.regshift;
- if (up->pdev->id != 4)
- return readb(up->port.membase + offset);
- else
- return readw(up->port.membase + offset);
-}
-
-static inline void serial_out(struct uart_omap_port *up, int offset, int value)
-{
- offset <<= up->port.regshift;
- if (up->pdev->id != 4)
- writeb(value, up->port.membase + offset);
- else
- writew(value, up->port.membase + offset);
-}
-
-static inline void serial_omap_clear_fifos(struct uart_omap_port *p)
-{
- serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO);
- serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO |
- UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
- serial_out(p, UART_FCR, 0);
- fcr[p->pdev->id - 1] = 0;
-}
-
-/*
- * We have written our own function to get the divisor so as to support
- * 13x mode. TBD see if this can be integrated with uart_get_divisor.
- */
-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_stop_rxdma(struct uart_omap_port *up)
-{
- if (up->uart_dma.rx_dma_state) {
- del_timer(&up->uart_dma.rx_timer);
- omap_stop_dma(up->uart_dma.rx_dma_channel);
- omap_free_dma(up->uart_dma.rx_dma_channel);
- up->uart_dma.rx_dma_channel = 0xFF;
- up->uart_dma.rx_dma_state = 0x0;
- }
-}
-
-static void serial_omap_enable_ms(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
-
- DPRINTK("serial_omap_enable_ms+%d\n", up->pdev->id);
- up->ier |= UART_IER_MSI;
- serial_out(up, UART_IER, up->ier);
-}
-
-static void serial_omap_stop_tx(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- if (up->use_dma && up->uart_dma.tx_dma_channel != 0xFF) {
- /*
- * Check if dma is still active . If yes do nothing,
- * return. Else stop dma.
- */
- int status = omap_readl(OMAP34XX_DMA4_BASE +
- OMAP_DMA4_CCR(up->uart_dma.tx_dma_channel));
- if (status & (1 << 7))
- return;
- omap_stop_dma(up->uart_dma.tx_dma_channel);
- omap_free_dma(up->uart_dma.tx_dma_channel);
- up->uart_dma.tx_dma_channel = 0xFF;
- }
-
- if (up->ier & UART_IER_THRI) {
- up->ier &= ~UART_IER_THRI;
- serial_out(up, UART_IER, up->ier);
- }
-#ifdef CONFIG_PM
- if (!up->uart_dma.rx_dma_state) {
- unsigned int tmp;
- tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7) | (2 << 3);
- serial_out(up, UART_OMAP_SYSC, tmp); /* smart-idle */
- }
-#endif
-}
-
-static void serial_omap_stop_rx(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- serial_omap_stop_rxdma(up);
- up->ier &= ~UART_IER_RLSI;
- up->port.read_status_mask &= ~UART_LSR_DR;
- serial_out(up, UART_IER, up->ier);
-
-}
-
-static inline void receive_chars(struct uart_omap_port *up, int *status)
-{
- unsigned int ch, flag;
- int max_count = 256;
-
-#if DBG_RX_DATA
- printk("[RX]: ");
-#endif
- do {
- ch = serial_in(up, UART_RX);
-#if DBG_RX_DATA
- if ((ch >= 32) && (ch < 127))
- printk("%c", ch);
- else
- printk("{0x%.2x}", ch);
-#endif
- flag = TTY_NORMAL;
- up->port.icount.rx++;
-
- if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
- UART_LSR_FE | UART_LSR_OE))) {
- /*
- * For statistics only
- */
- if (*status & UART_LSR_BI) {
- *status &= ~(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))
- goto ignore_char;
- } else if (*status & UART_LSR_PE)
- up->port.icount.parity++;
- else if (*status & UART_LSR_FE)
- up->port.icount.frame++;
- if (*status & UART_LSR_OE)
- up->port.icount.overrun++;
-
- /*
- * Mask off conditions which should be ignored.
- */
- *status &= up->port.read_status_mask;
-
-#ifdef CONFIG_SERIAL_OMAP_CONSOLE
- if (up->port.line == up->port.cons->index) {
- /* Recover the break flag from console xmit */
- *status |= up->lsr_break_flag;
- up->lsr_break_flag = 0;
- }
-#endif
- if (*status & UART_LSR_BI)
- flag = TTY_BREAK;
- else if (*status & UART_LSR_PE)
- flag = TTY_PARITY;
- else if (*status & UART_LSR_FE)
- flag = TTY_FRAME;
- }
-
- if (uart_handle_sysrq_char(&up->port, ch))
- goto ignore_char;
-
- uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
-
-ignore_char:
- *status = serial_in(up, UART_LSR);
- } while ((*status & UART_LSR_DR) && (max_count-- > 0));
-
- queue_work(omap_serial_workqueue, &up->tty_work);
-
-#if DBG_RX_DATA
- printk("\n");
-#endif
-}
-
-static void tty_flip_buffer_work(struct work_struct *work)
-{
- struct uart_omap_port *up =
- container_of(work, struct uart_omap_port, tty_work);
- struct tty_struct *tty = up->port.state->port.tty;
-
- tty_flip_buffer_push(tty);
-}
-
-static void transmit_chars(struct uart_omap_port *up)
-{
- struct circ_buf *xmit = &up->port.state->xmit;
- int count;
-
- 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)
- uart_write_wakeup(&up->port);
-
- if (uart_circ_empty(xmit))
- serial_omap_stop_tx(&up->port);
-}
-
-static void serial_omap_start_tx(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
-#ifdef CONFIG_PM
- /* Disallow OCP bus idle. UART TX irqs are not seen during
- * bus idle. Alternative is to set kernel timer at fifo
- * drain rate.
- */
- unsigned int tmp;
- tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7) | (1 << 3);
- serial_out(up, UART_OMAP_SYSC, tmp); /* no-idle */
-#endif
-
- if (up->use_dma && !(up->port.x_char)) {
-
- struct circ_buf *xmit = &up->port.state->xmit;
- unsigned int start = up->uart_dma.tx_buf_dma_phys +
- (xmit->tail & (UART_XMIT_SIZE - 1));
- if (uart_circ_empty(xmit) || up->uart_dma.tx_dma_state)
- return;
- spin_lock(&(up->uart_dma.tx_lock));
- up->uart_dma.tx_dma_state = 1;
- spin_unlock(&(up->uart_dma.tx_lock));
-
- up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
- /* It is a circular buffer. See if the buffer has wounded back.
- * If yes it will have to be transferred in two separate dma
- * transfers */
- if (start + up->uart_dma.tx_buf_size >= up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
- up->uart_dma.tx_buf_size = (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
-
- if (up->uart_dma.tx_dma_channel == 0xFF) {
- omap_request_dma(uart_dma_tx[up->pdev->id-1],
- "UART Tx DMA",
- (void *)uart_tx_dma_callback, up,
- &(up->uart_dma.tx_dma_channel));
- }
- omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
- OMAP_DMA_AMODE_CONSTANT,
- UART_BASE(up->pdev->id - 1), 0, 0);
- omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
- OMAP_DMA_AMODE_POST_INC, start, 0, 0);
-
- omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
- OMAP_DMA_DATA_TYPE_S8,
- up->uart_dma.tx_buf_size, 1,
- OMAP_DMA_SYNC_ELEMENT,
- uart_dma_tx[(up->pdev->id)-1], 0);
-
- omap_start_dma(up->uart_dma.tx_dma_channel);
-
- } else if (!(up->ier & UART_IER_THRI)) {
- up->ier |= UART_IER_THRI;
- serial_out(up, UART_IER, up->ier);
- }
-
- if (up->restore_autorts) {
- serial_omap_set_autorts(up, 1);
- up->restore_autorts = 0;
- }
-}
-
-static unsigned int check_modem_status(struct uart_omap_port *up)
-{
- 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;
-}
-
-/*
- * This handles the interrupt from one port.
- */
-static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
-{
- struct uart_omap_port *up = dev_id;
- unsigned int iir, lsr;
-
- iir = serial_in(up, UART_IIR);
- if (iir & UART_IIR_NO_INT)
- return IRQ_NONE;
- lsr = serial_in(up, UART_LSR);
- if ((iir & 0x4) && up->use_dma) {
- up->ier &= ~UART_IER_RDI;
- serial_out(up, UART_IER, up->ier);
- serial_omap_start_rxdma(up);
- } else if (lsr & UART_LSR_DR) {
- receive_chars(up, &lsr);
- /* XXX: After driver resume optimization, lower this */
- wake_lock_timeout(&omap_serial_wakelock, (HZ * 1));
- }
- check_modem_status(up);
- if ((lsr & UART_LSR_THRE) && (iir & 0x2))
- transmit_chars(up);
- isr8250_activity = jiffies;
-
- return IRQ_HANDLED;
-}
-
-static unsigned int serial_omap_tx_empty(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned long flags;
- unsigned int ret;
-
- DPRINTK("serial_omap_tx_empty+%d\n", up->pdev->id);
- 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);
-
- return ret;
-}
-
-static unsigned int serial_omap_get_mctrl(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned char status;
- unsigned int ret;
-
- status = check_modem_status(up);
- DPRINTK("serial_omap_get_mctrl+%d\n", up->pdev->id);
-
- ret = 0;
- 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 = (struct uart_omap_port *)port;
- unsigned char mcr = 0;
-
- DPRINTK("serial_omap_set_mctrl+%d\n", up->pdev->id);
- if (mctrl & TIOCM_RTS) {
- /*
- * We need to be careful not to cause
- * RTS to assert when we have a pending
- * auto-rts restore.
- */
- if (!up->restore_autorts)
- 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;
-
- mcr |= up->mcr;
- serial_out(up, UART_MCR, mcr);
-}
-
-static void serial_omap_break_ctl(struct uart_port *port, int break_state)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned long flags;
-
- DPRINTK("serial_omap_break_ctl+%d\n", up->pdev->id);
- 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);
-}
-
-static void serial_omap_wake_peer(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- struct plat_serialomap_port *pd = up->pdev->dev.platform_data;
- if (pd->wake_gpio_strobe) {
- gpio_direction_output(pd->wake_gpio_strobe, 1);
- udelay(5);
- gpio_direction_output(pd->wake_gpio_strobe, 0);
- udelay(5);
- }
-}
-
-static void serial_omap_set_autorts(struct uart_omap_port *p, int set)
-{
- u8 lcr_val = 0, mcr_val = 0, efr_val = 0;
- u8 lcr_backup = 0, mcr_backup = 0, efr_backup = 0;
-
- lcr_val = serial_in(p, UART_LCR);
- lcr_backup = lcr_val;
- /* Enter Config mode B */
- serial_out(p, UART_LCR, 0xbf);
-
- efr_val = serial_in(p, UART_EFR);
- efr_backup = efr_val;
-
- /*
- * Enhanced functions write enable.
- * Enables writes to IER[7:4], FCR[5:4], MCR[7:5]
- */
- serial_out(p, UART_EFR, efr_val | 0x10);
-
- mcr_val = serial_in(p, UART_MCR);
- mcr_backup = mcr_val;
- /* Enable access to TCR_REG and TLR_REG */
- serial_out(p, UART_MCR, mcr_val | 0x40);
-
- /* Set RX_FIFO_TRIG levels */
- serial_out(p, 0x18, 0x0f);
-
- efr_val = serial_in(p, UART_EFR);
- if (set)
- serial_out(p, UART_EFR, efr_val | (1 << 6));
- else
- serial_out(p, UART_EFR, efr_val & ~(1 << 6));
-
-
- mcr_val = serial_in(p, UART_MCR);
- /* Restore original state of TCR_TLR access */
- serial_out(p, UART_MCR, (mcr_val & ~0x40) | (mcr_backup & 0x40));
-
- /* Enhanced function write disable. */
- serial_out(p, UART_EFR, serial_in(p, UART_EFR) & ~0x10);
-
- /* Normal operation */
- serial_out(p, UART_LCR, lcr_backup);
-}
-
-static int serial_omap_startup(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned long flags;
- int irq_flags = port->flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
- int retval;
-
- /* Zoom2 has GPIO_102 connected to Serial device:
- * Active High
- */
-
- if (up->port.flags & UPF_TRIGGER_HIGH)
- irq_flags |= IRQF_TRIGGER_HIGH;
-
- if (up->port.flags & UPF_SHARE_IRQ)
- irq_flags |= IRQF_SHARED;
-
- /*
- * Allocate the IRQ
- */
- retval = request_irq(up->port.irq, serial_omap_irq, irq_flags,
- up->name, up);
- if (retval) {
- printk(KERN_ERR "%s: Failed to register IRQ %d for %s (%d)\n",
- __func__, up->port.irq, up->name, retval);
- return retval;
- }
-
-
- /* do not let tty layer execute RX in global workqueue, use a
- * dedicated workqueue managed by this driver */
- port->state->port.tty->low_latency = 1;
-
- /*
- * Stop the baud clock and disable the UART. UART will be enabled
- * back in set_termios. This is essential for DMA mode operations.
- */
- serial_out(up, UART_LCR, UART_LCR_DLAB);
- serial_out(up, UART_DLL, 0);
- serial_out(up, UART_DLM, 0);
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
-
- /*
- * Clear the FIFO buffers and disable them.
- * (they will be reenabled in set_termios())
- */
- serial_omap_clear_fifos(up);
- serial_out(up, UART_SCR, 0x00);
- /* For Hardware flow control */
-// serial_out(up, UART_MCR, 0x2);
-
- /*
- * 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);
- if (up->port.flags & UPF_FOURPORT) {
- if (!is_real_interrupt(up->port.irq))
- up->port.mctrl |= TIOCM_OUT1;
- } else {
- /*
- * Most PC uarts need OUT2 raised to enable interrupts.
- */
- if (is_real_interrupt(up->port.irq))
- 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;
-
-
-
- if (up->port.flags & UPF_FOURPORT) {
- unsigned int icp;
- /*
- * Enable interrupts on the AST Fourport board
- */
- icp = (up->port.iobase & 0xfe0) | 0x01f;
- outb_p(0x80, icp);
- (void) inb_p(icp);
- }
- if (up->use_dma) {
- if (!up->is_buf_dma_alloced) {
- free_page((unsigned long)up->port.state->xmit.buf);
- up->port.state->xmit.buf = NULL;
- up->port.state->xmit.buf = dma_alloc_coherent(NULL,
- UART_XMIT_SIZE,
- (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 0);
- up->is_buf_dma_alloced = 1;
- }
- init_timer(&(up->uart_dma.rx_timer));
- up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
- up->uart_dma.rx_timer.data = up->pdev->id;
- /* Currently the buffer size is 4KB. Can increase it later*/
- up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
- up->uart_dma.rx_buf_size,
- (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
- serial_omap_start_rxdma(up);
- } else {
- /*
- * 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;
- /*| UART_IER_RTOIE |UART_IER_THRI; */
- serial_out(up, UART_IER, up->ier);
- }
-
- return 0;
-}
-
-static void serial_omap_shutdown(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned long flags;
- u8 lcr, efr;
-
- DPRINTK("serial_omap_shutdown+%d\n", up->pdev->id);
- /*
- * Disable interrupts from this port
- */
- up->ier = 0;
- serial_out(up, UART_IER, 0);
-
- /*
- * If we're using auto-rts then disable it.
- */
- lcr = serial_in(up, UART_LCR);
- serial_out(up, UART_LCR, 0xbf);
- efr = serial_in(up, UART_EFR);
- serial_out(up, UART_LCR, lcr);
-
- if (efr & UART_EFR_RTS) {
- serial_omap_set_autorts(up, 0);
- up->restore_autorts = 1;
- }
-
- spin_lock_irqsave(&up->port.lock, flags);
- if (up->port.flags & UPF_FOURPORT) {
- /* reset interrupts on the AST Fourport board */
- inb((up->port.iobase & 0xfe0) | 0x1f);
- up->port.mctrl |= TIOCM_OUT1;
- } else
- up->port.mctrl &= ~TIOCM_OUT2;
- serial_omap_set_mctrl(&up->port, (up->port.mctrl & ~TIOCM_RTS));
- spin_unlock_irqrestore(&up->port.lock, flags);
-
- if (up->pdev->id == gps_port) {
- serial_out(up, UART_LCR, UART_LCR_DLAB);
- serial_out(up, UART_DLL, 0);
- serial_out(up, UART_DLM, 0);
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
- }
-
- /*
- * 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);
- if (up->use_dma) {
- int tmp;
- if (up->is_buf_dma_alloced) {
- dma_free_coherent(up->port.dev,
- UART_XMIT_SIZE,
- up->port.state->xmit.buf,
- up->uart_dma.tx_buf_dma_phys);
- up->port.state->xmit.buf = NULL;
- up->is_buf_dma_alloced = 0;
- }
- /*TBD: Check if this is really needed here*/
- serial_omap_stop_rx(port);
- dma_free_coherent(up->port.dev,
- up->uart_dma.rx_buf_size,
- up->uart_dma.rx_buf, up->uart_dma.rx_buf_dma_phys);
- up->uart_dma.rx_buf = NULL;
- tmp = serial_in(up, UART_OMAP_SYSC) & 0x7;
- serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
- }
-
- free_irq(up->port.irq, up);
-
- if (cancel_work_sync(&up->tty_work))
- tty_flip_buffer_work(&up->tty_work);
-}
-
-static void
-serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned char cval;
- unsigned char efr = 0;
- unsigned long flags;
- unsigned int baud, quot;
-
- serial_out(up, UART_LCR, UART_LCR_DLAB);
- serial_out(up, UART_DLL, 0);
- serial_out(up, UART_DLM, 0);
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
- 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);
-
- if (up->use_dma)
- fcr[up->pdev->id - 1] = UART_FCR_ENABLE_FIFO | 0x1 << 6 | 0x1 << 4 | UART_FCR_DMA_SELECT;
- else
- fcr[up->pdev->id - 1] = UART_FCR_ENABLE_FIFO;
-
- /*
- * Ok, we're now changing the port state. Do it with
- * interrupts disabled.
- */
- 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;
-
- /*
- * CTS flow control flag and 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);
-
- if (termios->c_cflag & CRTSCTS) {
-#ifdef CONFIG_SERIAL_OMAP3430_HW_FLOW_CONTROL
- efr |= ((up->ctsrts & UART_EFR_CTS) |
- (up->restore_autorts ? 0 : UART_EFR_RTS));
-#else
- efr |= (UART_EFR_CTS | (up->restore_autorts ? 0 : UART_EFR_RTS));
-#endif
- }
-
- serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
- serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
- serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
-
- serial_out(up, UART_LCR, cval); /* reset DLAB */
- up->lcr = cval; /* Save LCR */
- if (up->use_dma)
- serial_out(up, UART_OMAP_SCR , ((1 << 6) | (1 << 7)));
-
- serial_out(up, UART_LCR, 0xbf); /* Access EFR */
- serial_out(up, UART_EFR, UART_EFR_ECB);
- serial_out(up, UART_LCR, 0x0); /* Access FCR */
- serial_out(up, UART_FCR, fcr[up->pdev->id - 1]);
- serial_out(up, UART_LCR, 0xbf); /* Access EFR */
- serial_out(up, UART_EFR, efr);
- serial_out(up, UART_LCR, cval); /* Access FCR */
-
- serial_omap_set_mctrl(&up->port, up->port.mctrl);
- /*
- * Clear all the status registers and RX register before
- * enabling UART
- */
- (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);
-
- if (baud > 230400 && baud != 3000000)
- serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE13X);
- else
- serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE16X);
- spin_unlock_irqrestore(&up->port.lock, flags);
-
- DPRINTK("serial_omap_set_termios+%d\n", up->pdev->id);
- serial_omap_display_reg(port);
-}
-
-static void
-serial_omap_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned char efr;
- DPRINTK("serial_omap_pm+%d\n", up->pdev->id);
- efr = serial_in(up, UART_EFR);
- serial_out(up, UART_LCR, 0xBF);
- 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, 0xBF);
- serial_out(up, UART_EFR, efr);
- serial_out(up, UART_LCR, 0);
-}
-
-static void serial_omap_release_port(struct uart_port *port)
-{
- DPRINTK("serial_omap_release_port+\n");
-}
-
-static int serial_omap_request_port(struct uart_port *port)
-{
- DPRINTK("serial_omap_request_port+\n");
- return 0;
-}
-
-static void serial_omap_config_port(struct uart_port *port, int flags)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
-
- DPRINTK("serial_omap_config_port+%d\n", up->pdev->id);
- 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 */
- DPRINTK("serial_omap_verify_port+\n");
- return -EINVAL;
-}
-
-static const char *
-serial_omap_type(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
-
- DPRINTK("serial_omap_hs_type+%d\n", up->pdev->id);
- return up->name;
-}
-
-#ifdef CONFIG_SERIAL_OMAP_CONSOLE
-
-static struct uart_omap_port *serial_omap_console_ports[4];
-
-static struct uart_driver serial_omap_reg;
-
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
-/*
- * Wait for transmitter & holding register to empty
- */
-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);
- }
- }
-}
-
-static void serial_omap_console_putchar(struct uart_port *port, int ch)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
-
- wait_for_xmitr(up);
- serial_out(up, UART_TX, ch);
-}
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- *
- * The console_lock must be held when we get here.
- */
-static void
-serial_omap_console_write(struct console *co, const char *s,
- unsigned int count)
-{
- /* TBD: In 8250 interrupts were disabled in the beginning of this
- * function and enabled in the end. We might need to do the same*/
- struct uart_omap_port *up = serial_omap_console_ports[co->index];
- unsigned int ier;
-
- /*
- * 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);
-}
-
-static int
-serial_omap_console_setup(struct console *co, char *options)
-{
- struct uart_omap_port *up;
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
- int r;
-
- 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);
-
- r = uart_set_options(&up->port, co, baud, parity, bits, flow);
-
- return r;
-}
-
-static struct tty_driver *my_uart_console_device(struct console *co, int *index)
-{
- struct uart_driver *p = co->data;
- *index = co->index;
- return p->tty_driver;
-}
-
-static struct console serial_omap_console = {
- .name = "ttyS",
- .write = serial_omap_console_write,
- .device = my_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->pdev->id - 1] = 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
-
-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,
- .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,
- .wake_peer = serial_omap_wake_peer,
-};
-
-static struct uart_driver serial_omap_reg = {
- .owner = THIS_MODULE,
- .driver_name = "OMAP-HS-SERIAL",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
- .minor = 128,
- .nr = 4,
- .cons = OMAP_CONSOLE,
-};
-
-static int serial_omap_remove(struct platform_device *dev);
-static int serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct uart_omap_port *up = platform_get_drvdata(pdev);
- unsigned int tmp;
- u8 lcr, efr;
- static unsigned int fifo_suspendbrks;
-
- /* Disable interrupts from this port */
- serial_out(up, UART_IER, 0);
-
- /* If we're using auto-rts then disable it. */
- lcr = serial_in(up, UART_LCR);
- serial_out(up, UART_LCR, 0xbf);
- efr = serial_in(up, UART_EFR);
- serial_out(up, UART_LCR, lcr);
-
- if (efr & UART_EFR_RTS) {
- serial_omap_set_autorts(up, 0);
- up->restore_autorts = 1;
- /*
- * Force RTS output to inactive (high) after disable autorts
- * mode. This RTS bit might not be restored when enable autorts
- * next time, since the RTS output controlled by hardware
- * flow control.
- */
- serial_omap_set_mctrl(&up->port, (up->port.mctrl & ~TIOCM_RTS));
- }
-
- /*
- * There seems to be a window here where
- * data could still be on the way to the
- * fifo. This delay is ~1 byte time @ 115.2k
- */
- udelay(80);
-
- if (are_driveromap_uarts_active(up->port.line)) {
- fifo_suspendbrks++;
- printk(KERN_WARNING "UART FIFO break suspend %d\n",
- fifo_suspendbrks);
-
- if (up->restore_autorts) {
- serial_omap_set_autorts(up, 1);
- up->restore_autorts = 0;
- }
- serial_out(up, UART_IER, up->ier);
- return -EBUSY;
- }
-
- serial_out(up, UART_IER, up->ier);
-
- if (up)
- uart_suspend_port(&serial_omap_reg, &up->port);
- if (up->use_dma) {
- /*
- * Silicon Errata i291 workaround.
- * UART Module has to be put in force idle if it is
- * configured in DMA mode and when there is no activity
- * expected.
- */
- tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7);
- serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
- }
- return 0;
-}
-
-static int serial_omap_resume(struct platform_device *dev)
-{
- struct uart_omap_port *up = platform_get_drvdata(dev);
- if (up)
- uart_resume_port(&serial_omap_reg, &up->port);
-
- return 0;
-}
-
-static void serial_omap_rx_timeout(unsigned long uart_no)
-{
- struct uart_omap_port *up = ui[uart_no - 1];
- unsigned int curr_dma_pos;
- curr_dma_pos = omap_readl(OMAP34XX_DMA4_BASE + OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel));
- if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || (curr_dma_pos == 0)) {
- /*
- * If there is no transfer rx happening for 10sec then stop the dma
- * else just restart the timer. See if 10 sec can be improved.
- */
- if (jiffies_to_msecs(jiffies - isr8250_activity) < 10000)
- mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_timeout));
- else {
- del_timer(&up->uart_dma.rx_timer);
- serial_omap_stop_rxdma(up);
- up->ier |= UART_IER_RDI;
- serial_out(up, UART_IER, up->ier);
- }
-
- return;
- } else {
- unsigned int curr_transmitted_size = curr_dma_pos - up->uart_dma.prev_rx_dma_pos;
- up->port.icount.rx += curr_transmitted_size;
- tty_insert_flip_string(up->port.state->port.tty, up->uart_dma.rx_buf + (up->uart_dma.prev_rx_dma_pos - up->uart_dma.rx_buf_dma_phys), curr_transmitted_size);
- queue_work(omap_serial_workqueue, &up->tty_work);
- up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
- if (up->uart_dma.rx_buf_size + up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
- serial_omap_start_rxdma(up);
- } else
- mod_timer(&up->uart_dma.rx_timer,
- jiffies + usecs_to_jiffies(up->uart_dma.rx_timeout));
- isr8250_activity = jiffies;
- }
-}
-
-static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
-{
- return;
-}
-
-static void serial_omap_start_rxdma(struct uart_omap_port *up)
-{
-#ifdef CONFIG_PM
- /* Disallow OCP bus idle. UART TX irqs are not seen during
- * bus idle. Alternative is to set kernel timer at fifo
- * drain rate.
- */
- unsigned int tmp;
- tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7) | (1 << 3);
- serial_out(up, UART_OMAP_SYSC, tmp); /* no-idle */
-#endif
- if (up->uart_dma.rx_dma_channel == 0xFF) {
- omap_request_dma(uart_dma_rx[up->pdev->id-1], "UART Rx DMA",
- (void *)uart_rx_dma_callback, up,
- &(up->uart_dma.rx_dma_channel));
- omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
- OMAP_DMA_AMODE_CONSTANT,
- UART_BASE(up->pdev->id - 1), 0, 0);
- omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
- OMAP_DMA_AMODE_POST_INC,
- up->uart_dma.rx_buf_dma_phys, 0, 0);
- omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
- OMAP_DMA_DATA_TYPE_S8,
- up->uart_dma.rx_buf_size, 1,
- OMAP_DMA_SYNC_ELEMENT,
- uart_dma_rx[up->pdev->id-1], 0);
- }
- up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
- omap_writel(0, OMAP34XX_DMA4_BASE +
- OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel));
- omap_start_dma(up->uart_dma.rx_dma_channel);
- mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_timeout));
- up->uart_dma.rx_dma_state = 1;
-}
-
-static void serial_omap_continue_tx(struct uart_omap_port *up)
-{
- struct circ_buf *xmit = &up->port.state->xmit;
- int start = up->uart_dma.tx_buf_dma_phys + (xmit->tail & (UART_XMIT_SIZE - 1));
- if (uart_circ_empty(xmit))
- return;
-
- up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
- /* It is a circular buffer. See if the buffer has wounded back.
- * If yes it will have to be transferred in two separate dma
- * transfers
- */
- if (start + up->uart_dma.tx_buf_size >=
- up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
- up->uart_dma.tx_buf_size =
- (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
- omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
- OMAP_DMA_AMODE_CONSTANT,
- UART_BASE(up->pdev->id - 1), 0, 0);
- omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
- OMAP_DMA_AMODE_POST_INC, start, 0, 0);
-
- omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
- OMAP_DMA_DATA_TYPE_S8,
- up->uart_dma.tx_buf_size, 1,
- OMAP_DMA_SYNC_ELEMENT,
- uart_dma_tx[(up->pdev->id)-1], 0);
-
- omap_start_dma(up->uart_dma.tx_dma_channel);
-}
-
-static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)data;
- struct circ_buf *xmit = &up->port.state->xmit;
- xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & (UART_XMIT_SIZE - 1);
- up->port.icount.tx += up->uart_dma.tx_buf_size;
-
- /* Revisit: Not sure about the below two steps. Seen some instabilities
- * with them. might not be needed in the DMA path
- */
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&up->port);
-
- if (uart_circ_empty(xmit)) {
-
- spin_lock(&(up->uart_dma.tx_lock));
- serial_omap_stop_tx(&up->port);
- up->uart_dma.tx_dma_state = 0;
- spin_unlock(&(up->uart_dma.tx_lock));
- } else {
- omap_stop_dma(up->uart_dma.tx_dma_channel);
- serial_omap_continue_tx(up);
- }
- isr8250_activity = jiffies;
-
- return;
-}
-
-static int serial_omap_probe(struct platform_device *pdev)
-{
- struct plat_serialomap_port *pdata = pdev->dev.platform_data;
- struct uart_omap_port *up;
- struct resource *mem, *irq;
- int ret = -ENOSPC;
-#if 0
- char str[7];
-#endif
-
- if (!pdata) {
- dev_err(&pdev->dev, "no platform data?\n");
- return -ENODEV;
- }
-
- if (pdata->disabled) {
- dev_err(&pdev->dev, "device disabled\n");
- return -ENODEV;
- }
-
- 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;
- }
-
- ret = (int) request_mem_region(mem->start, (mem->end - mem->start) + 1,
- pdev->dev.driver->name);
- if (!ret) {
- dev_err(&pdev->dev, "memory region already claimed\n");
- return -EBUSY;
- }
- up = kzalloc(sizeof(*up), GFP_KERNEL);
- if (up == NULL) {
- ret = -ENOMEM;
- goto do_release_region;
- }
- sprintf(up->name, "OMAP HS UART%d", pdev->id);
-
- up->pdev = pdev;
- up->port.dev = &pdev->dev;
- up->port.type = PORT_OMAP;
- up->port.iotype = UPIO_MEM;
- up->port.mapbase = mem->start;
- up->port.irq = irq->start;
- up->port.fifosize = 64;
- up->port.ops = &serial_omap_pops;
- up->port.line = pdev->id - 1;
-#define QUART_CLK (1843200)
- if (pdev->id == 4) {
- up->port.membase = ioremap_nocache(mem->start, 0x16 << 1);
- up->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
- UPF_SHARE_IRQ | UPF_TRIGGER_HIGH;
- up->port.uartclk = QUART_CLK;
- up->port.regshift = 1;
- } else {
- up->port.membase = (void *) OMAP2_L4_IO_ADDRESS(mem->start);
- up->port.flags = pdata->flags;
- up->port.uartclk = 48000000;
- up->port.regshift = 2;
-#ifdef CONFIG_SERIAL_OMAP3430_HW_FLOW_CONTROL
- up->ctsrts = pdata->ctsrts;
-#endif
- }
-
-
- if (pdev->id == (UART1+1)) {
-#ifdef CONFIG_SERIAL_OMAP_DMA_UART1
- up->use_dma = 1;
- up->uart_dma.rx_buf_size =
- CONFIG_SERIAL_OMAP_UART1_RXDMA_BUFSIZE;
- up->uart_dma.rx_timeout =
- CONFIG_SERIAL_OMAP_UART1_RXDMA_TIMEOUT;
-#endif
- } else if (pdev->id == (UART2+1)) {
-#ifdef CONFIG_SERIAL_OMAP_DMA_UART2
- up->use_dma = 1;
- up->uart_dma.rx_buf_size =
- CONFIG_SERIAL_OMAP_UART2_RXDMA_BUFSIZE;
- up->uart_dma.rx_timeout =
- CONFIG_SERIAL_OMAP_UART2_RXDMA_TIMEOUT;
-#endif
- } else if (pdev->id == (UART3+1)) {
-#ifdef CONFIG_SERIAL_OMAP_DMA_UART3
- up->use_dma = 1;
- up->uart_dma.rx_buf_size =
- CONFIG_SERIAL_OMAP_UART3_RXDMA_BUFSIZE;
- up->uart_dma.rx_timeout =
- CONFIG_SERIAL_OMAP_UART3_RXDMA_TIMEOUT;
-#endif
- }
-
- if (up->use_dma) {
- spin_lock_init(&(up->uart_dma.tx_lock));
- spin_lock_init(&(up->uart_dma.rx_lock));
- up->uart_dma.tx_dma_channel = 0xFF;
- up->uart_dma.rx_dma_channel = 0xFF;
- }
-#if 0
- if (console_detect(str))
- printk("Invalid console paramter. UART Library Init Failed!\n");
-#endif
- up->use_console = 0;
- fcr[pdev->id - 1] = 0;
-#if 0
- if (!strcmp(str, "ttyS0"))
- up->use_console = 1;
- else if (!strcmp(str, "ttyS1"))
- up->use_console = 1;
- else if (!strcmp(str, "ttyS2"))
- up->use_console = 1;
- else if (!strcmp(str, "ttyS3"))
- up->use_console = 1;
- else
- printk(KERN_INFO
- "!!!!!!!! Unable to recongnize Console UART........\n");
-#endif
- up->use_console = 1;
- ui[pdev->id - 1] = up;
- serial_omap_add_console_port(up);
- serial_omap_clear_fifos(up);
-
- ret = uart_add_one_port(&serial_omap_reg, &up->port);
- if (ret != 0)
- goto do_release_region;
- platform_set_drvdata(pdev, up);
-
- if (pdata->wake_gpio_strobe) {
- if (gpio_request(pdata->wake_gpio_strobe,
- "UART AP -> BP wakeup strobe")) {
- printk(KERN_ERR "Error requesting GPIO\n");
- } else
- gpio_direction_output(pdata->wake_gpio_strobe, 0);
- }
-
- INIT_WORK(&up->tty_work, tty_flip_buffer_work);
-
- return 0;
-do_release_region:
- release_mem_region(mem->start, (mem->end - mem->start) + 1);
- return ret;
-}
-
-static int serial_omap_remove(struct platform_device *dev)
-{
- struct uart_omap_port *up = platform_get_drvdata(dev);
-
- platform_set_drvdata(dev, NULL);
- if (up) {
- uart_remove_one_port(&serial_omap_reg, &up->port);
- kfree(up);
- }
- return 0;
-}
-
-static struct platform_driver serial_omap_driver = {
- .probe = serial_omap_probe,
- .remove = serial_omap_remove,
-
- .suspend = serial_omap_suspend,
- .resume = serial_omap_resume,
- .driver = {
- .name = "omap-hs-uart",
- },
-};
-
-int my_serial_omap_init(void)
-{
- int ret;
-
- printk(KERN_INFO "registering omap-hs-uart...\n");
- wake_lock_init(&omap_serial_wakelock, WAKE_LOCK_SUSPEND,
- "omap_hs_serial");
- omap_serial_workqueue = create_singlethread_workqueue("omap_hs_serial");
- 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;
-}
-
-void serial_omap_exit(void)
-{
- wake_lock_destroy(&omap_serial_wakelock);
- destroy_workqueue(omap_serial_workqueue);
- platform_driver_unregister(&serial_omap_driver);
- uart_unregister_driver(&serial_omap_reg);
-}
-
-#if defined(CONFIG_OMAP3_PM)
-int omap24xx_uart_cts_wakeup(int uart_no, int state)
-{
- u32 *ptr;
- unsigned char lcr, efr;
- struct uart_omap_port *up = ui[uart_no];
-
- if (unlikely(uart_no < 0 || uart_no > MAX_UARTS)) {
- printk(KERN_INFO "Bad uart id %d \n", uart_no);
- return -EPERM;
- }
-
- if (state) {
- /*
- * Enable the CTS for io pad wakeup
- */
- switch (uart_no) {
- case UART1:
- ptr = (u32 *) (&CONTROL_PADCONF_UART1_CTS);
- break;
- case UART2:
- ptr = (u32 *) (&CONTROL_PADCONF_UART2_CTS);
- break;
- default:
- printk(KERN_ERR
- "Wakeup on Uart%d is not supported\n", uart_no);
- return -EPERM;
- }
- *ptr |= (u32)((IO_PAD_WAKEUPENABLE | IO_PAD_OFFPULLUDENABLE |
- IO_PAD_OFFOUTENABLE | IO_PAD_OFFENABLE |
- IO_PAD_INPUTENABLE | IO_PAD_PULLUDENABLE|
- IO_PAD_MUXMODE0)
- );
- /*
- * Enable the CTS for module level wakeup
- */
- lcr = serial_in(up, UART_LCR);
- serial_out(up, UART_LCR, 0xbf);
- efr = serial_in(up, UART_EFR);
- serial_out(up, UART_EFR, efr | UART_EFR_ECB);
- serial_out(up, UART_LCR, lcr);
- up->ier |= (1 << 7);
- serial_out(up, UART_IER, up->ier);
- serial_out(up, UART_OMAP_WER,
- serial_in(up, UART_OMAP_WER) | 0x1);
- serial_out(up, UART_LCR, 0xbf);
- serial_out(up, UART_EFR, efr);
- serial_out(up, UART_LCR, lcr);
-
- } else {
- /*
- * Disable the CTS capability for io pad wakeup
- */
- switch (uart_no) {
- case UART1:
- ptr = (u32 *) (&CONTROL_PADCONF_UART1_CTS);
- break;
- case UART2:
- ptr = (u32 *) (&CONTROL_PADCONF_UART2_CTS);
- break;
- default:
- printk(KERN_ERR
- "Wakeup on Uart%d is not supported\n", uart_no);
- return -EPERM;
- }
- *ptr &= (u32) (~(IO_PAD_WAKEUPENABLE | IO_PAD_OFFPULLUDENABLE |
- IO_PAD_OFFOUTENABLE | IO_PAD_OFFENABLE |
- IO_PAD_INPUTENABLE | IO_PAD_PULLUDENABLE));
- *ptr |= IO_PAD_MUXMODE7;
-
- /*
- * Disable the CTS for module level wakeup
- */
- lcr = serial_in(up, UART_LCR);
- serial_out(up, UART_LCR, 0xbf);
- efr = serial_in(up, UART_EFR);
- serial_out(up, UART_EFR, efr | UART_EFR_ECB);
- serial_out(up, UART_LCR, lcr);
- up->ier &= ~(1 << 7);
- serial_out(up, UART_IER, up->ier);
- /* TBD:Do we really want to disable module wake up for this in WER*/
- serial_out(up, UART_LCR, 0xbf);
- serial_out(up, UART_EFR, efr);
- serial_out(up, UART_LCR, lcr);
- }
- return 0;
-}
-EXPORT_SYMBOL(omap24xx_uart_cts_wakeup);
-#endif
-
-#ifdef CONFIG_PM
-#if 0
-/**
- * are_driver8250_uarts_active() - Check if any ports managed by this
- * driver are currently busy. This should be called with interrupts
- * disabled.
- */
-int are_driveromap_uarts_active(int num)
-{
- struct circ_buf *xmit;
- unsigned int status;
- struct uart_omap_port *up = ui[num];
-
- if (!up)
- return 0;
-
- /* check ownership of port */
- /* Check only ports managed by this driver and open */
- if ((up->port.dev == NULL) || (up->port.type == PORT_UNKNOWN))
- return 0;
-
- /* driver owns this port but it's closed */
- if (up->port.state == NULL)
- return 0;
-
- /* check for any current pending activity */
- /* Any queued work in ring buffer which can be handled still? */
- xmit = &up->port.state->xmit;
- if (!(uart_circ_empty(xmit) || uart_tx_stopped(&up->port)))
- return 1;
- status = serial_in(up, UART_LSR);
-
- /* TX hardware not empty */
- if (!(status & (UART_LSR_TEMT | UART_LSR_THRE)))
- return 1;
-
- /* Any rx activity? */
- if (status & UART_LSR_DR)
- return 1;
-
- if (up->use_dma) {
- /*
- * Silicon Errata i291 workaround.
- * UART Module has to be put in force idle if it is
- * configured in DMA mode and when there is no activity
- * expected.
- */
- unsigned int tmp;
- del_timer(&up->uart_dma.rx_timer);
- serial_omap_stop_rxdma(up);
- up->ier |= UART_IER_RDI;
- serial_out(up, UART_IER, up->ier);
- tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7);
- serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
- }
-
- return 0;
-}
-EXPORT_SYMBOL(are_driveromap_uarts_active);
-
-#endif
-#endif
-
-static void serial_omap_display_reg(struct uart_port *port)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)port;
- unsigned int lcr, efr, mcr, dll, dlh, xon1, xon2, xoff1, xoff2;
- unsigned int tcr, tlr, uasr;
- DPRINTK("Register dump for UART%d\n", up->pdev->id);
- DPRINTK("IER_REG=0x%x\n", serial_in(up, UART_IER));
- DPRINTK("IIR_REG=0x%x\n", serial_in(up, UART_IIR));
- lcr = serial_in(up, UART_LCR);
- DPRINTK("LCR_REG=0x%x\n", lcr);
- mcr = serial_in(up, UART_MCR);
- DPRINTK("MCR_REG=0x%x\n", mcr);
- DPRINTK("LSR_REG=0x%x\n", serial_in(up, UART_LSR));
- DPRINTK("MSR_REG=0x%x\n", serial_in(up, UART_MSR));
- DPRINTK("SPR_REG=0x%x\n", serial_in(up, UART_OMAP_SPR));
- DPRINTK("MDR1_REG=0x%x\n", serial_in(up, UART_OMAP_MDR1));
- DPRINTK("MDR2_REG=0x%x\n", serial_in(up, UART_OMAP_MDR2));
- DPRINTK("SCR_REG=0x%x\n", serial_in(up, UART_OMAP_SCR));
- DPRINTK("SSR_REG=0x%x\n", serial_in(up, UART_OMAP_SSR));
- DPRINTK("MVR_REG=0x%x\n", serial_in(up, UART_OMAP_MVER));
- DPRINTK("SYSC_REG=0x%x\n", serial_in(up, UART_OMAP_SYSC));
- DPRINTK("SYSS_REG=0x%x\n", serial_in(up, UART_OMAP_SYSS));
- DPRINTK("WER_REG=0x%x\n", serial_in(up, UART_OMAP_WER));
-
- serial_out(up, UART_LCR, 0xBF);
- dll = serial_in(up, UART_DLL);
- dlh = serial_in(up, UART_DLM);
- efr = serial_in(up, UART_EFR);
- xon1 = serial_in(up, UART_XON1);
- xon2 = serial_in(up, UART_XON2);
-
- serial_out(up, UART_EFR, efr | UART_EFR_ECB);
- serial_out(up, UART_LCR, lcr);
- serial_out(up, UART_MCR, mcr | UART_MCR_TCRTLR);
- serial_out(up, UART_LCR, 0xBF);
-
- tcr = serial_in(up, UART_TI752_TCR);
- tlr = serial_in(up, UART_TI752_TLR);
-
- serial_out(up, UART_LCR, lcr);
- serial_out(up, UART_MCR, mcr);
- serial_out(up, UART_LCR, 0xBF);
-
- xoff1 = serial_in(up, UART_XOFF1);
- xoff2 = serial_in(up, UART_XOFF2);
- uasr = serial_in(up, UART_OMAP_UASR);
-
- serial_out(up, UART_EFR, efr);
- serial_out(up, UART_LCR, lcr);
-
-
- DPRINTK("DLL_REG=0x%x\n", dll);
- DPRINTK("DLH_REG=0x%x\n", dlh);
- DPRINTK("EFR_REG=0x%x\n", efr);
-
- DPRINTK("XON1_ADDR_REG=0x%x\n", xon1);
- DPRINTK("XON2_ADDR_REG=0x%x\n", xon2);
- DPRINTK("TCR_REG=0x%x\n", tcr);
- DPRINTK("TLR_REG=0x%x\n", tlr);
-
-
- DPRINTK("XOFF1_REG=0x%x\n", xoff1);
- DPRINTK("XOFF2_REG=0x%x\n", xoff2);
- DPRINTK("UASR_REG=0x%x\n", uasr);
-
-}
projects / ms2-kexec / commitdiff