From e14c6eae15c85ae74d5a5b1dec3975eccf0fb337 Mon Sep 17 00:00:00 2001 From: Michael Gernoth Date: Wed, 25 May 2011 18:01:26 +0200 Subject: [PATCH] add more serial stuff, still not working... --- Makefile | 2 +- hs_cons.c | 4 + omap-hs-serial.c | 1857 ++++++++++++++++++++++++++++++++++++++++++++++ omap2_serial.c | 4 +- 4 files changed, 1864 insertions(+), 3 deletions(-) create mode 100644 omap-hs-serial.c diff --git a/Makefile b/Makefile index 8f04a0f..ef4b881 100644 --- a/Makefile +++ b/Makefile @@ -11,7 +11,7 @@ EXTRA_CFLAGS += -DCONFIG_KEXEC -Wall -DSYS_CALL_TABLE=0x$(SYS_CALL_TABLE) -DKERN obj-m += kexec_load.o headphone_cons.o kexec_load-objs := kexec.o machine_kexec.o mmu.o sys.o core.o relocate_kernel.o \ proc-v7.o tlb-v7.o cache-v7.o abort-ev7.o pabort-v7.o copypage-v6.o driver_sys.o -headphone_cons-objs := hs_cons.o omap2_serial.o +headphone_cons-objs := hs_cons.o omap2_serial.o omap-hs-serial.o all: PATH=$(CROSS_PATH):$(PATH) CROSS_COMPILE=$(CROSS_COMPILE) ARCH=$(ARCH) make -C $(KDIR) M=$(PWD) modules diff --git a/hs_cons.c b/hs_cons.c index 858fbf1..7983db4 100644 --- a/hs_cons.c +++ b/hs_cons.c @@ -33,6 +33,7 @@ static int (*add_preferred_console)(char *, int, char*) = (int (*)(char*, int, c void my_omap_serial_init(int wake_gpio_strobe, unsigned int wake_strobe_enable_mask); int my_omap_hs_init(void); +int my_serial_omap_init(void); #define MAPPHONE_BPWAKE_STROBE_GPIO 157 @@ -49,6 +50,9 @@ static int __init headphone_cons_init(void) if (!gpio_get_value(hs_switch)) return -ENODEV; + printk(KERN_INFO "Loading slightly modified omap serial driver...\n"); + my_serial_omap_init(); + printk(KERN_INFO "Enabling UART3...\n"); my_omap_serial_init(MAPPHONE_BPWAKE_STROBE_GPIO, 0x01); my_omap_hs_init(); diff --git a/omap-hs-serial.c b/omap-hs-serial.c new file mode 100644 index 0000000..8d2fbad --- /dev/null +++ b/omap-hs-serial.c @@ -0,0 +1,1857 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#ifdef CONFIG_OMAP3_PM +#include <../arch/arm/mach-omap2/ti-compat.h> +#include <../arch/arm/mach-omap2/prcm-regs.h> +#endif +#include + +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_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 = 64, + .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; + char str[7]; + + 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 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 (console_detect(str)) + printk("Invalid console paramter. UART Library Init Failed!\n"); + up->use_console = 0; + fcr[pdev->id - 1] = 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"); + 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; + + 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); + +} diff --git a/omap2_serial.c b/omap2_serial.c index 71577bf..afed285 100644 --- a/omap2_serial.c +++ b/omap2_serial.c @@ -188,8 +188,8 @@ static struct platform_device uart2_device = { }; #endif static struct platform_device uart3_device = { - .name = "omap-uart", - .id = 4, + .name = "omap-hs-uart", + .id = 3, .num_resources = ARRAY_SIZE(omap2_uart3_resources), .resource = omap2_uart3_resources, .dev.platform_data = &serial_platform_data[2], -- 2.39.2