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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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Blackfin Serial Driver: updates kgdb over Blackfin serial driver with kgdb framework
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sonic Zhang
Linus Torvalds
parent
b58602a4ba
commit
52e15f0eae
@ -22,7 +22,8 @@
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#include <linux/tty_flip.h>
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#include <linux/serial_core.h>
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#ifdef CONFIG_KGDB_UART
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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#include <linux/kgdb.h>
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#include <asm/irq_regs.h>
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#endif
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@ -45,6 +46,16 @@
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static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
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static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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# ifndef CONFIG_SERIAL_BFIN_PIO
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# error KGDB only support UART in PIO mode.
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# endif
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static int kgdboc_port_line;
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static int kgdboc_break_enabled;
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#endif
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/*
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* Setup for console. Argument comes from the menuconfig
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*/
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@ -110,9 +121,7 @@ static void bfin_serial_start_tx(struct uart_port *port)
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static void bfin_serial_stop_rx(struct uart_port *port)
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{
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struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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#ifdef CONFIG_KGDB_UART
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if (uart->port.line != CONFIG_KGDB_UART_PORT)
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#endif
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UART_CLEAR_IER(uart, ERBFI);
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}
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@ -123,49 +132,6 @@ static void bfin_serial_enable_ms(struct uart_port *port)
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{
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}
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#ifdef CONFIG_KGDB_UART
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static int kgdb_entry_state;
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void kgdb_put_debug_char(int chr)
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{
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struct bfin_serial_port *uart;
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if (CONFIG_KGDB_UART_PORT < 0
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|| CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
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uart = &bfin_serial_ports[0];
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else
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uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
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while (!(UART_GET_LSR(uart) & THRE)) {
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SSYNC();
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}
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UART_CLEAR_DLAB(uart);
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UART_PUT_CHAR(uart, (unsigned char)chr);
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SSYNC();
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}
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int kgdb_get_debug_char(void)
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{
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struct bfin_serial_port *uart;
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unsigned char chr;
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if (CONFIG_KGDB_UART_PORT < 0
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|| CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
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uart = &bfin_serial_ports[0];
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else
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uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
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while(!(UART_GET_LSR(uart) & DR)) {
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SSYNC();
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}
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UART_CLEAR_DLAB(uart);
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chr = UART_GET_CHAR(uart);
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SSYNC();
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return chr;
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}
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#endif
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#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
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# define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
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@ -178,7 +144,7 @@ int kgdb_get_debug_char(void)
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#ifdef CONFIG_SERIAL_BFIN_PIO
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static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
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{
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struct tty_struct *tty = uart->port.info->port.tty;
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struct tty_struct *tty = NULL;
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unsigned int status, ch, flg;
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static struct timeval anomaly_start = { .tv_sec = 0 };
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@ -188,27 +154,18 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
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ch = UART_GET_CHAR(uart);
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uart->port.icount.rx++;
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#ifdef CONFIG_KGDB_UART
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if (uart->port.line == CONFIG_KGDB_UART_PORT) {
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struct pt_regs *regs = get_irq_regs();
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if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
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kgdb_breakkey_pressed(regs);
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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if (kgdb_connected && kgdboc_port_line == uart->port.line)
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if (ch == 0x3) {/* Ctrl + C */
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kgdb_breakpoint();
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return;
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} else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
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kgdb_entry_state = 1;
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} else if (kgdb_entry_state == 1 && ch == 'q') {
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kgdb_entry_state = 0;
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kgdb_breakkey_pressed(regs);
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return;
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} else if (ch == 0x3) {/* Ctrl + C */
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kgdb_entry_state = 0;
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kgdb_breakkey_pressed(regs);
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return;
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} else {
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kgdb_entry_state = 0;
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}
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}
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if (!uart->port.info || !uart->port.info->tty)
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return;
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#endif
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tty = uart->port.info->tty;
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if (ANOMALY_05000363) {
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/* The BF533 (and BF561) family of processors have a nice anomaly
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@ -630,16 +587,16 @@ static int bfin_serial_startup(struct uart_port *port)
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uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
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add_timer(&(uart->rx_dma_timer));
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#else
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
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kgdboc_break_enabled = 0;
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else {
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# endif
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if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
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"BFIN_UART_RX", uart)) {
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# ifdef CONFIG_KGDB_UART
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if (uart->port.line != CONFIG_KGDB_UART_PORT) {
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# endif
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printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
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return -EBUSY;
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# ifdef CONFIG_KGDB_UART
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}
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# endif
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}
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if (request_irq
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@ -685,6 +642,10 @@ static int bfin_serial_startup(struct uart_port *port)
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}
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}
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# endif
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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}
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# endif
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#endif
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UART_SET_IER(uart, ERBFI);
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return 0;
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@ -715,9 +676,6 @@ static void bfin_serial_shutdown(struct uart_port *port)
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default:
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break;
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};
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#endif
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#ifdef CONFIG_KGDB_UART
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if (uart->port.line != CONFIG_KGDB_UART_PORT)
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#endif
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free_irq(uart->port.irq, uart);
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free_irq(uart->port.irq+1, uart);
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@ -887,6 +845,51 @@ static void bfin_serial_set_ldisc(struct uart_port *port)
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}
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}
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#ifdef CONFIG_CONSOLE_POLL
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static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
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{
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struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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while (!(UART_GET_LSR(uart) & THRE))
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cpu_relax();
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UART_CLEAR_DLAB(uart);
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UART_PUT_CHAR(uart, (unsigned char)chr);
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}
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static int bfin_serial_poll_get_char(struct uart_port *port)
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{
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struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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unsigned char chr;
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while (!(UART_GET_LSR(uart) & DR))
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cpu_relax();
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UART_CLEAR_DLAB(uart);
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chr = UART_GET_CHAR(uart);
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return chr;
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}
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#endif
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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static void bfin_kgdboc_port_shutdown(struct uart_port *port)
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{
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if (kgdboc_break_enabled) {
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kgdboc_break_enabled = 0;
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bfin_serial_shutdown(port);
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}
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}
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static int bfin_kgdboc_port_startup(struct uart_port *port)
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{
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kgdboc_port_line = port->line;
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kgdboc_break_enabled = !bfin_serial_startup(port);
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return 0;
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}
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#endif
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static struct uart_ops bfin_serial_pops = {
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.tx_empty = bfin_serial_tx_empty,
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.set_mctrl = bfin_serial_set_mctrl,
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@ -905,6 +908,15 @@ static struct uart_ops bfin_serial_pops = {
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.request_port = bfin_serial_request_port,
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.config_port = bfin_serial_config_port,
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.verify_port = bfin_serial_verify_port,
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#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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.kgdboc_port_startup = bfin_kgdboc_port_startup,
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.kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
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#endif
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#ifdef CONFIG_CONSOLE_POLL
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.poll_put_char = bfin_serial_poll_put_char,
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.poll_get_char = bfin_serial_poll_get_char,
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#endif
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};
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static void __init bfin_serial_init_ports(void)
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@ -1076,10 +1088,7 @@ static int __init bfin_serial_rs_console_init(void)
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{
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bfin_serial_init_ports();
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register_console(&bfin_serial_console);
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#ifdef CONFIG_KGDB_UART
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kgdb_entry_state = 0;
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init_kgdb_uart();
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#endif
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return 0;
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}
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console_initcall(bfin_serial_rs_console_init);
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@ -1235,10 +1244,6 @@ static struct platform_driver bfin_serial_driver = {
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static int __init bfin_serial_init(void)
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{
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int ret;
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#ifdef CONFIG_KGDB_UART
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struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
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struct ktermios t;
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#endif
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pr_info("Serial: Blackfin serial driver\n");
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@ -1252,21 +1257,6 @@ static int __init bfin_serial_init(void)
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uart_unregister_driver(&bfin_serial_reg);
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}
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}
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#ifdef CONFIG_KGDB_UART
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if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
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request_irq(uart->port.irq, bfin_serial_rx_int,
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IRQF_DISABLED, "BFIN_UART_RX", uart);
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pr_info("Request irq for kgdb uart port\n");
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UART_SET_IER(uart, ERBFI);
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SSYNC();
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t.c_cflag = CS8|B57600;
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t.c_iflag = 0;
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t.c_oflag = 0;
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t.c_lflag = ICANON;
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t.c_line = CONFIG_KGDB_UART_PORT;
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bfin_serial_set_termios(&uart->port, &t, &t);
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}
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#endif
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return ret;
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}
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@ -1276,6 +1266,7 @@ static void __exit bfin_serial_exit(void)
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uart_unregister_driver(&bfin_serial_reg);
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}
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module_init(bfin_serial_init);
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module_exit(bfin_serial_exit);
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