[PATCH v2 01/11] serial:st-asc: Add ST ASC driver.

Srinivas KANDAGATLA
2013-06-10T11:53:55Z

Thankyou for your comment and suggestion,
I will fix the POSIX compliant issue.

On 10/06/13 10:35, Russell King - ARM Linux wrote:
> On Mon, Jun 10, 2013 at 10:21:00AM +0100, Srinivas KANDAGATLA wrote:
>> This patch adds support to ASC (asynchronous serial controller)
>> driver, which is basically a standard serial driver. This IP is common
>> across all the ST parts for settop box platforms.
>>
>> ASC is embedded in ST COMMS IP block. It supports Rx & Tx functionality.
>> It support all industry standard baud rates.
>
> Your driver is not POSIX compliant.
>
>> + for (; count != 0; count--) {
>> + c = asc_in(port, ASC_RXBUF);
>> + flag = TTY_NORMAL;
>> + port->icount.rx++;
>> +
>> + if (unlikely(c & ASC_RXBUF_FE)) {
>> + if (c == ASC_RXBUF_FE) {
>> + port->icount.brk++;
>> + if (uart_handle_break(port))
>> + continue;
>> + flag = TTY_BREAK;
>> + } else {
>> + port->icount.frame++;
>> + flag = TTY_FRAME;
>> + }
>> + } else if (ascport->check_parity &&
>> + unlikely(c & ASC_RXBUF_PE)) {
>> + port->icount.parity++;
>> + flag = TTY_PARITY;
>> + }
>> +
>> + if (uart_handle_sysrq_char(port, c))
>> + continue;
>> + tty_insert_flip_char(tport, c & 0xff, flag);
>> + }
>> + if (overrun) {
>> + port->icount.overrun++;
>> + tty_insert_flip_char(tport, 0, TTY_OVERRUN);
>> + }
>
> No support for ignoring error conditions. No support for ignoring all
> input... and:
>
>> +static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
>> + struct ktermios *old)
>> +{
>> + struct asc_port *ascport = to_asc_port(port);
>> + unsigned int baud;
>> + u32 ctrl_val;
>> + tcflag_t cflag;
>> + unsigned long flags;
>> +
>> + port->uartclk = clk_get_rate(ascport->clk);
>> +
>> + baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
>> + cflag = termios->c_cflag;
>> +
>> + spin_lock_irqsave(&port->lock, flags);
>> +
>> + /* read control register */
>> + ctrl_val = asc_in(port, ASC_CTL);
>> +
>> + /* stop serial port and reset value */
>> + asc_out(port, ASC_CTL, (ctrl_val & ~ASC_CTL_RUN));
>> + ctrl_val = ASC_CTL_RXENABLE | ASC_CTL_FIFOENABLE;
>> +
>> + /* reset fifo rx & tx */
>> + asc_out(port, ASC_TXRESET, 1);
>> + asc_out(port, ASC_RXRESET, 1);
>> +
>> + /* set character length */
>> + if ((cflag & CSIZE) == CS7) {
>> + ctrl_val |= ASC_CTL_MODE_7BIT_PAR;
>> + } else {
>> + ctrl_val |= (cflag & PARENB) ? ASC_CTL_MODE_8BIT_PAR :
>> + ASC_CTL_MODE_8BIT;
>> + }
>> +
>> + ascport->check_parity = (cflag & PARENB) ? 1 : 0;
>> +
>> + /* set stop bit */
>> + ctrl_val |= (cflag & CSTOPB) ? ASC_CTL_STOP_2BIT : ASC_CTL_STOP_1BIT;
>> +
>> + /* odd parity */
>> + if (cflag & PARODD)
>> + ctrl_val |= ASC_CTL_PARITYODD;
>> +
>> + /* hardware flow control */
>> + if ((cflag & CRTSCTS) && ascport->hw_flow_control)
>> + ctrl_val |= ASC_CTL_CTSENABLE;
>
> This doesn't reflect those facts back into the termios structure to
> indicate that they aren't supported.
>
> Consider using uart_port's ignore and read status masks to implement
> the break, framing, parity and overrun checking in your interrupt
> handler using the same methodology as drivers like 8250, amba-pl011
> etc. That will help you get these code sequences correct.
>
>