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serial: lantiq: Add SMP support 

The existing driver can only support single core SoC. But new multicore
platforms which reuse the same driver/IP need SMP support. This patch adds
multicore support in the driver.

Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://lore.kernel.org/r/7912786cccad60c72b20ea724af1def505ab22aa.1565160764.git.rahul.tanwar@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rahul Tanwar 2019-08-07 17:21:31 +08:00 committed by Greg Kroah-Hartman
parent 6798e901ab
commit 4b967e63fd
1 changed files with 32 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/tty/serial/lantiq.c
View File

@ -99,7 +99,6 @@
static void lqasc_tx_chars(struct uart_port *port);
static struct ltq_uart_port *lqasc_port[MAXPORTS];
static struct uart_driver lqasc_reg;
static DEFINE_SPINLOCK(ltq_asc_lock);
struct ltq_uart_port {
struct uart_port port;
@ -110,6 +109,7 @@ struct ltq_uart_port {
unsigned int tx_irq;
unsigned int rx_irq;
unsigned int err_irq;
spinlock_t lock; /* exclusive access for multi core */
};
static inline void asc_update_bits(u32 clear, u32 set, void __iomem *reg)
@ -135,9 +135,11 @@ static void
lqasc_start_tx(struct uart_port *port)
{
unsigned long flags;
spin_lock_irqsave(&ltq_asc_lock, flags);
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
spin_lock_irqsave(&ltq_port->lock, flags);
lqasc_tx_chars(port);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
spin_unlock_irqrestore(&ltq_port->lock, flags);
return;
}
@ -245,9 +247,11 @@ lqasc_tx_int(int irq, void *_port)
{
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
spin_lock_irqsave(&ltq_port->lock, flags);
__raw_writel(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
spin_unlock_irqrestore(&ltq_port->lock, flags);
lqasc_start_tx(port);
return IRQ_HANDLED;
}
@ -257,11 +261,13 @@ lqasc_err_int(int irq, void *_port)
{
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
spin_lock_irqsave(&ltq_port->lock, flags);
/* clear any pending interrupts */
asc_update_bits(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE |
ASCWHBSTATE_CLRROE, port->membase + LTQ_ASC_WHBSTATE);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
spin_unlock_irqrestore(&ltq_port->lock, flags);
return IRQ_HANDLED;
}
@ -270,10 +276,12 @@ lqasc_rx_int(int irq, void *_port)
{
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
spin_lock_irqsave(&ltq_port->lock, flags);
__raw_writel(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR);
lqasc_rx_chars(port);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
spin_unlock_irqrestore(&ltq_port->lock, flags);
return IRQ_HANDLED;
}
@ -307,11 +315,13 @@ lqasc_startup(struct uart_port *port)
{
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
int retval;
unsigned long flags;
if (!IS_ERR(ltq_port->clk))
clk_prepare_enable(ltq_port->clk);
port->uartclk = clk_get_rate(ltq_port->freqclk);
spin_lock_irqsave(&ltq_port->lock, flags);
asc_update_bits(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET),
port->membase + LTQ_ASC_CLC);
@ -331,6 +341,8 @@ lqasc_startup(struct uart_port *port)
asc_update_bits(0, ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN |
ASCCON_ROEN, port->membase + LTQ_ASC_CON);
spin_unlock_irqrestore(&ltq_port->lock, flags);
retval = request_irq(ltq_port->tx_irq, lqasc_tx_int,
0, "asc_tx", port);
if (retval) {
@ -367,15 +379,19 @@ static void
lqasc_shutdown(struct uart_port *port)
{
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
unsigned long flags;
free_irq(ltq_port->tx_irq, port);
free_irq(ltq_port->rx_irq, port);
free_irq(ltq_port->err_irq, port);
spin_lock_irqsave(&ltq_port->lock, flags);
__raw_writel(0, port->membase + LTQ_ASC_CON);
asc_update_bits(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU,
port->membase + LTQ_ASC_RXFCON);
asc_update_bits(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
port->membase + LTQ_ASC_TXFCON);
spin_unlock_irqrestore(&ltq_port->lock, flags);
if (!IS_ERR(ltq_port->clk))
clk_disable_unprepare(ltq_port->clk);
}
@ -390,6 +406,7 @@ lqasc_set_termios(struct uart_port *port,
unsigned int baud;
unsigned int con = 0;
unsigned long flags;
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
cflag = new->c_cflag;
iflag = new->c_iflag;
@ -443,7 +460,7 @@ lqasc_set_termios(struct uart_port *port,
/* set error signals - framing, parity and overrun, enable receiver */
con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
spin_lock_irqsave(&ltq_asc_lock, flags);
spin_lock_irqsave(&ltq_port->lock, flags);
/* set up CON */
asc_update_bits(0, con, port->membase + LTQ_ASC_CON);
@ -471,7 +488,7 @@ lqasc_set_termios(struct uart_port *port,
/* enable rx */
__raw_writel(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
spin_unlock_irqrestore(&ltq_port->lock, flags);
/* Don't rewrite B0 */
if (tty_termios_baud_rate(new))
@ -589,17 +606,14 @@ lqasc_console_putchar(struct uart_port *port, int ch)
static void lqasc_serial_port_write(struct uart_port *port, const char *s,
u_int count)
{
unsigned long flags;
spin_lock_irqsave(&ltq_asc_lock, flags);
uart_console_write(port, s, count, lqasc_console_putchar);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
}
static void
lqasc_console_write(struct console *co, const char *s, u_int count)
{
struct ltq_uart_port *ltq_port;
unsigned long flags;
if (co->index >= MAXPORTS)
return;
@ -608,7 +622,9 @@ lqasc_console_write(struct console *co, const char *s, u_int count)
if (!ltq_port)
return;
spin_lock_irqsave(&ltq_port->lock, flags);
lqasc_serial_port_write(&ltq_port->port, s, count);
spin_unlock_irqrestore(&ltq_port->lock, flags);
}
static int __init
@ -766,6 +782,7 @@ lqasc_probe(struct platform_device *pdev)
ltq_port->rx_irq = irqres[1].start;
ltq_port->err_irq = irqres[2].start;
spin_lock_init(&ltq_port->lock);
lqasc_port[line] = ltq_port;
platform_set_drvdata(pdev, ltq_port);