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MN10300: Allow KGDB to use the MN10300 serial ports
Allow KGDB to use the MN10300 serial ports through the polled I/O interface provided via the TTY/serial layer and the kgdboc driver. This allows the kernel to be started with something like: kgdboc=ttySM0,115200 added to the command line. Signed-off-by: David Howells <dhowells@redhat.com>
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@ -119,6 +119,10 @@ static int mn10300_serial_request_port(struct uart_port *);
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static void mn10300_serial_config_port(struct uart_port *, int);
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static void mn10300_serial_config_port(struct uart_port *, int);
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static int mn10300_serial_verify_port(struct uart_port *,
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static int mn10300_serial_verify_port(struct uart_port *,
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struct serial_struct *);
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struct serial_struct *);
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#ifdef CONFIG_CONSOLE_POLL
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static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char);
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static int mn10300_serial_poll_get_char(struct uart_port *);
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#endif
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static const struct uart_ops mn10300_serial_ops = {
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static const struct uart_ops mn10300_serial_ops = {
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.tx_empty = mn10300_serial_tx_empty,
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.tx_empty = mn10300_serial_tx_empty,
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@ -138,6 +142,10 @@ static const struct uart_ops mn10300_serial_ops = {
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.request_port = mn10300_serial_request_port,
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.request_port = mn10300_serial_request_port,
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.config_port = mn10300_serial_config_port,
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.config_port = mn10300_serial_config_port,
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.verify_port = mn10300_serial_verify_port,
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.verify_port = mn10300_serial_verify_port,
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#ifdef CONFIG_CONSOLE_POLL
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.poll_put_char = mn10300_serial_poll_put_char,
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.poll_get_char = mn10300_serial_poll_get_char,
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#endif
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};
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};
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static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
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static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
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@ -1634,3 +1642,70 @@ static int __init mn10300_serial_console_init(void)
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console_initcall(mn10300_serial_console_init);
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console_initcall(mn10300_serial_console_init);
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#endif
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#endif
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#ifdef CONFIG_CONSOLE_POLL
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/*
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* Polled character reception for the kernel debugger
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*/
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static int mn10300_serial_poll_get_char(struct uart_port *_port)
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{
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struct mn10300_serial_port *port =
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container_of(_port, struct mn10300_serial_port, uart);
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unsigned ix;
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u8 st, ch;
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_enter("%s", port->name);
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do {
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/* pull chars out of the hat */
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ix = port->rx_outp;
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if (ix == port->rx_inp)
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return NO_POLL_CHAR;
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ch = port->rx_buffer[ix++];
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st = port->rx_buffer[ix++];
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smp_rmb();
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port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
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} while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF));
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return ch;
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}
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/*
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* Polled character transmission for the kernel debugger
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*/
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static void mn10300_serial_poll_put_char(struct uart_port *_port,
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unsigned char ch)
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{
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struct mn10300_serial_port *port =
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container_of(_port, struct mn10300_serial_port, uart);
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u8 intr, tmp;
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/* wait for the transmitter to finish anything it might be doing (and
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* this includes the virtual DMA handler, so it might take a while) */
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while (*port->_status & (SC01STR_TBF | SC01STR_TXF))
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continue;
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/* disable the Tx ready interrupt */
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intr = *port->_intr;
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*port->_intr = intr & ~SC01ICR_TI;
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tmp = *port->_intr;
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if (ch == 0x0a) {
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*(u8 *) port->_txb = 0x0d;
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while (*port->_status & SC01STR_TBF)
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continue;
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}
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*(u8 *) port->_txb = ch;
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while (*port->_status & SC01STR_TBF)
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continue;
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/* restore the Tx interrupt flag */
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*port->_intr = intr;
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tmp = *port->_intr;
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}
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#endif /* CONFIG_CONSOLE_POLL */
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