diff options
Diffstat (limited to 'drivers/serial/bfin_5xx.c')
| -rw-r--r-- | drivers/serial/bfin_5xx.c | 182 |
1 files changed, 179 insertions, 3 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c index 22569bd5d821..66c92bc36f3d 100644 --- a/drivers/serial/bfin_5xx.c +++ b/drivers/serial/bfin_5xx.c @@ -41,6 +41,11 @@ #include <linux/tty_flip.h> #include <linux/serial_core.h> +#ifdef CONFIG_KGDB_UART +#include <linux/kgdb.h> +#include <asm/irq_regs.h> +#endif + #include <asm/gpio.h> #include <asm/mach/bfin_serial_5xx.h> @@ -81,15 +86,29 @@ static void bfin_serial_stop_tx(struct uart_port *port) { struct bfin_serial_port *uart = (struct bfin_serial_port *)port; +#ifdef CONFIG_BF54x + while (!(UART_GET_LSR(uart) & TEMT)) + continue; +#endif + #ifdef CONFIG_SERIAL_BFIN_DMA disable_dma(uart->tx_dma_channel); #else +#ifdef CONFIG_BF54x + /* Waiting for Transmission Finished */ + while (!(UART_GET_LSR(uart) & TFI)) + continue; + /* Clear TFI bit */ + UART_PUT_LSR(uart, TFI); + UART_CLEAR_IER(uart, ETBEI); +#else unsigned short ier; ier = UART_GET_IER(uart); ier &= ~ETBEI; UART_PUT_IER(uart, ier); #endif +#endif } /* @@ -102,12 +121,16 @@ static void bfin_serial_start_tx(struct uart_port *port) #ifdef CONFIG_SERIAL_BFIN_DMA bfin_serial_dma_tx_chars(uart); #else +#ifdef CONFIG_BF54x + UART_SET_IER(uart, ETBEI); +#else unsigned short ier; ier = UART_GET_IER(uart); ier |= ETBEI; UART_PUT_IER(uart, ier); bfin_serial_tx_chars(uart); #endif +#endif } /* @@ -116,11 +139,18 @@ static void bfin_serial_start_tx(struct uart_port *port) static void bfin_serial_stop_rx(struct uart_port *port) { struct bfin_serial_port *uart = (struct bfin_serial_port *)port; +#ifdef CONFIG_BF54x + UART_CLEAR_IER(uart, ERBFI); +#else unsigned short ier; ier = UART_GET_IER(uart); +#ifdef CONFIG_KGDB_UART + if (uart->port.line != CONFIG_KGDB_UART_PORT) +#endif ier &= ~ERBFI; UART_PUT_IER(uart, ier); +#endif } /* @@ -130,6 +160,49 @@ static void bfin_serial_enable_ms(struct uart_port *port) { } +#ifdef CONFIG_KGDB_UART +static int kgdb_entry_state; + +void kgdb_put_debug_char(int chr) +{ + struct bfin_serial_port *uart; + + if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) + uart = &bfin_serial_ports[0]; + else + uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; + + while (!(UART_GET_LSR(uart) & THRE)) { + __builtin_bfin_ssync(); + } + UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); + __builtin_bfin_ssync(); + UART_PUT_CHAR(uart, (unsigned char)chr); + __builtin_bfin_ssync(); +} + +int kgdb_get_debug_char(void) +{ + struct bfin_serial_port *uart; + unsigned char chr; + + if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) + uart = &bfin_serial_ports[0]; + else + uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; + + while(!(UART_GET_LSR(uart) & DR)) { + __builtin_bfin_ssync(); + } + UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); + __builtin_bfin_ssync(); + chr = UART_GET_CHAR(uart); + __builtin_bfin_ssync(); + + return chr; +} +#endif + #ifdef CONFIG_SERIAL_BFIN_PIO static void local_put_char(struct bfin_serial_port *uart, char ch) { @@ -152,6 +225,9 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart) { struct tty_struct *tty = uart->port.info->tty; unsigned int status, ch, flg; +#ifdef CONFIG_KGDB_UART + struct pt_regs *regs = get_irq_regs(); +#endif #ifdef BF533_FAMILY static int in_break = 0; #endif @@ -160,6 +236,27 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart) ch = UART_GET_CHAR(uart); uart->port.icount.rx++; +#ifdef CONFIG_KGDB_UART + if (uart->port.line == CONFIG_KGDB_UART_PORT) { + if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */ + kgdb_breakkey_pressed(regs); + return; + } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */ + kgdb_entry_state = 1; + } else if (kgdb_entry_state == 1 && ch == 'q') { + kgdb_entry_state = 0; + kgdb_breakkey_pressed(regs); + return; + } else if (ch == 0x3) {/* Ctrl + C */ + kgdb_entry_state = 0; + kgdb_breakkey_pressed(regs); + return; + } else { + kgdb_entry_state = 0; + } + } +#endif + #ifdef BF533_FAMILY /* The BF533 family of processors have a nice misbehavior where * they continuously generate characters for a "single" break. @@ -250,10 +347,21 @@ static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) { struct bfin_serial_port *uart = dev_id; +#ifdef CONFIG_BF54x + unsigned short status; + spin_lock(&uart->port.lock); + status = UART_GET_LSR(uart); + while ((UART_GET_IER(uart) & ERBFI) && (status & DR)) { + bfin_serial_rx_chars(uart); + status = UART_GET_LSR(uart); + } + spin_unlock(&uart->port.lock); +#else spin_lock(&uart->port.lock); while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY) bfin_serial_rx_chars(uart); spin_unlock(&uart->port.lock); +#endif return IRQ_HANDLED; } @@ -261,10 +369,21 @@ static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) { struct bfin_serial_port *uart = dev_id; +#ifdef CONFIG_BF54x + unsigned short status; + spin_lock(&uart->port.lock); + status = UART_GET_LSR(uart); + while ((UART_GET_IER(uart) & ETBEI) && (status & THRE)) { + bfin_serial_tx_chars(uart); + status = UART_GET_LSR(uart); + } + spin_unlock(&uart->port.lock); +#else spin_lock(&uart->port.lock); while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY) bfin_serial_tx_chars(uart); spin_unlock(&uart->port.lock); +#endif return IRQ_HANDLED; } @@ -275,7 +394,6 @@ static void bfin_serial_do_work(struct work_struct *work) bfin_serial_mctrl_check(uart); } - #endif #ifdef CONFIG_SERIAL_BFIN_DMA @@ -324,9 +442,13 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) set_dma_x_count(uart->tx_dma_channel, uart->tx_count); set_dma_x_modify(uart->tx_dma_channel, 1); enable_dma(uart->tx_dma_channel); +#ifdef CONFIG_BF54x + UART_SET_IER(uart, ETBEI); +#else ier = UART_GET_IER(uart); ier |= ETBEI; UART_PUT_IER(uart, ier); +#endif spin_unlock_irqrestore(&uart->port.lock, flags); } @@ -406,9 +528,13 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { clear_dma_irqstat(uart->tx_dma_channel); disable_dma(uart->tx_dma_channel); +#ifdef CONFIG_BF54x + UART_CLEAR_IER(uart, ETBEI); +#else ier = UART_GET_IER(uart); ier &= ~ETBEI; UART_PUT_IER(uart, ier); +#endif xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1); uart->port.icount.tx+=uart->tx_count; @@ -571,7 +697,11 @@ static int bfin_serial_startup(struct uart_port *port) uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; add_timer(&(uart->rx_dma_timer)); #else +# ifdef CONFIG_KGDB_UART + if (uart->port.line != CONFIG_KGDB_UART_PORT && request_irq +# else if (request_irq +# endif (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, "BFIN_UART_RX", uart)) { printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); @@ -586,7 +716,11 @@ static int bfin_serial_startup(struct uart_port *port) return -EBUSY; } #endif +#ifdef CONFIG_BF54x + UART_SET_IER(uart, ERBFI); +#else UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); +#endif return 0; } @@ -601,6 +735,9 @@ static void bfin_serial_shutdown(struct uart_port *port) free_dma(uart->rx_dma_channel); del_timer(&(uart->rx_dma_timer)); #else +#ifdef CONFIG_KGDB_UART + if (uart->port.line != CONFIG_KGDB_UART_PORT) +#endif free_irq(uart->port.irq, uart); free_irq(uart->port.irq+1, uart); #endif @@ -674,29 +811,41 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, /* Disable UART */ ier = UART_GET_IER(uart); +#ifdef CONFIG_BF54x + UART_CLEAR_IER(uart, 0xF); +#else UART_PUT_IER(uart, 0); +#endif +#ifndef CONFIG_BF54x /* Set DLAB in LCR to Access DLL and DLH */ val = UART_GET_LCR(uart); val |= DLAB; UART_PUT_LCR(uart, val); SSYNC(); +#endif UART_PUT_DLL(uart, quot & 0xFF); SSYNC(); UART_PUT_DLH(uart, (quot >> 8) & 0xFF); SSYNC(); +#ifndef CONFIG_BF54x /* Clear DLAB in LCR to Access THR RBR IER */ val = UART_GET_LCR(uart); val &= ~DLAB; UART_PUT_LCR(uart, val); SSYNC(); +#endif UART_PUT_LCR(uart, lcr); /* Enable UART */ +#ifdef CONFIG_BF54x + UART_SET_IER(uart, ier); +#else UART_PUT_IER(uart, ier); +#endif val = UART_GET_GCTL(uart); val |= UCEN; @@ -808,15 +957,15 @@ static void __init bfin_serial_init_ports(void) bfin_serial_resource[i].uart_rts_pin; #endif bfin_serial_hw_init(&bfin_serial_ports[i]); - } + } #ifdef CONFIG_SERIAL_BFIN_CONSOLE static void bfin_serial_console_putchar(struct uart_port *port, int ch) { struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - while (!(UART_GET_LSR(uart))) + while (!(UART_GET_LSR(uart) & THRE)) barrier(); UART_PUT_CHAR(uart, ch); SSYNC(); @@ -868,18 +1017,22 @@ bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, case 2: *bits = 7; break; case 3: *bits = 8; break; } +#ifndef CONFIG_BF54x /* Set DLAB in LCR to Access DLL and DLH */ val = UART_GET_LCR(uart); val |= DLAB; UART_PUT_LCR(uart, val); +#endif dll = UART_GET_DLL(uart); dlh = UART_GET_DLH(uart); +#ifndef CONFIG_BF54x /* Clear DLAB in LCR to Access THR RBR IER */ val = UART_GET_LCR(uart); val &= ~DLAB; UART_PUT_LCR(uart, val); +#endif *baud = get_sclk() / (16*(dll | dlh << 8)); } @@ -931,6 +1084,10 @@ static int __init bfin_serial_rs_console_init(void) { bfin_serial_init_ports(); register_console(&bfin_serial_console); +#ifdef CONFIG_KGDB_UART + kgdb_entry_state = 0; + init_kgdb_uart(); +#endif return 0; } console_initcall(bfin_serial_rs_console_init); @@ -1023,6 +1180,10 @@ static struct platform_driver bfin_serial_driver = { static int __init bfin_serial_init(void) { int ret; +#ifdef CONFIG_KGDB_UART + struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; + struct termios t; +#endif pr_info("Serial: Blackfin serial driver\n"); @@ -1036,6 +1197,21 @@ static int __init bfin_serial_init(void) uart_unregister_driver(&bfin_serial_reg); } } +#ifdef CONFIG_KGDB_UART + if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) { + request_irq(uart->port.irq, bfin_serial_int, + IRQF_DISABLED, "BFIN_UART_RX", uart); + pr_info("Request irq for kgdb uart port\n"); + UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); + __builtin_bfin_ssync(); + t.c_cflag = CS8|B57600; + t.c_iflag = 0; + t.c_oflag = 0; + t.c_lflag = ICANON; + t.c_line = CONFIG_KGDB_UART_PORT; + bfin_serial_set_termios(&uart->port, &t, &t); + } +#endif return ret; } |