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Subject[PATCH 2/9] serial/arc: Refactor by referencing to uart_port where possible
Date
The ARC UART MMIO helpers would take arc_uart_port and then reference
generic uart_port->membase member. So change them to difrectly refer to
uart_port and fix call sites accordingly.

This removes the need for to_arc_port() converion almost eveeywhere and
makes code a bit easier to read.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
drivers/tty/serial/arc_uart.c | 155 +++++++++++++++++++-----------------------
1 file changed, 69 insertions(+), 86 deletions(-)

diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 32fb8b94ff7c..4d971281e3d9 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -72,7 +72,7 @@
#define RXOERR 0x02 /* OverFlow Err: Char recv but RXFULL still set */

/* Uart bit fiddling helpers: lowest level */
-#define RBASE(uart, reg) (uart->port.membase + reg)
+#define RBASE(port, reg) (port->membase + reg)
#define UART_REG_SET(u, r, v) writeb((v), RBASE(u, r))
#define UART_REG_GET(u, r) readb(RBASE(u, r))

@@ -129,19 +129,15 @@ static struct uart_driver arc_uart_driver = {

static void arc_serial_stop_rx(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
- UART_RX_IRQ_DISABLE(uart);
+ UART_RX_IRQ_DISABLE(port);
}

static void arc_serial_stop_tx(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
- while (!(UART_GET_STATUS(uart) & TXEMPTY))
+ while (!(UART_GET_STATUS(port) & TXEMPTY))
cpu_relax();

- UART_TX_IRQ_DISABLE(uart);
+ UART_TX_IRQ_DISABLE(port);
}

/*
@@ -149,10 +145,9 @@ static void arc_serial_stop_tx(struct uart_port *port)
*/
static unsigned int arc_serial_tx_empty(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
unsigned int stat;

- stat = UART_GET_STATUS(uart);
+ stat = UART_GET_STATUS(port);
if (stat & TXEMPTY)
return TIOCSER_TEMT;

@@ -166,24 +161,24 @@ static unsigned int arc_serial_tx_empty(struct uart_port *port)
* = by uart_start( ) before calling us
* = tx_ist checks that too before calling
*/
-static void arc_serial_tx_chars(struct arc_uart_port *uart)
+static void arc_serial_tx_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &uart->port.state->xmit;
+ struct circ_buf *xmit = &port->state->xmit;
int sent = 0;
unsigned char ch;

- if (unlikely(uart->port.x_char)) {
- UART_SET_DATA(uart, uart->port.x_char);
- uart->port.icount.tx++;
- uart->port.x_char = 0;
+ if (unlikely(port->x_char)) {
+ UART_SET_DATA(port, port->x_char);
+ port->icount.tx++;
+ port->x_char = 0;
sent = 1;
} else if (xmit->tail != xmit->head) { /* TODO: uart_circ_empty */
ch = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- uart->port.icount.tx++;
- while (!(UART_GET_STATUS(uart) & TXEMPTY))
+ port->icount.tx++;
+ while (!(UART_GET_STATUS(port) & TXEMPTY))
cpu_relax();
- UART_SET_DATA(uart, ch);
+ UART_SET_DATA(port, ch);
sent = 1;
}

@@ -192,10 +187,10 @@ static void arc_serial_tx_chars(struct arc_uart_port *uart)
* By Hard ISR to schedule processing in software interrupt part
*/
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&uart->port);
+ uart_write_wakeup(port);

if (sent)
- UART_TX_IRQ_ENABLE(uart);
+ UART_TX_IRQ_ENABLE(port);
}

/*
@@ -204,12 +199,10 @@ static void arc_serial_tx_chars(struct arc_uart_port *uart)
*/
static void arc_serial_start_tx(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
- arc_serial_tx_chars(uart);
+ arc_serial_tx_chars(port);
}

-static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
+static void arc_serial_rx_chars(struct uart_port *port, unsigned int status)
{
unsigned int ch, flg = 0;

@@ -229,15 +222,15 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
*/
if (unlikely(status & (RXOERR | RXFERR))) {
if (status & RXOERR) {
- uart->port.icount.overrun++;
+ port->icount.overrun++;
flg = TTY_OVERRUN;
- UART_CLR_STATUS(uart, RXOERR);
+ UART_CLR_STATUS(port, RXOERR);
}

if (status & RXFERR) {
- uart->port.icount.frame++;
+ port->icount.frame++;
flg = TTY_FRAME;
- UART_CLR_STATUS(uart, RXFERR);
+ UART_CLR_STATUS(port, RXFERR);
}
} else
flg = TTY_NORMAL;
@@ -245,16 +238,16 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
if (status & RXEMPTY)
continue;

- ch = UART_GET_DATA(uart);
- uart->port.icount.rx++;
+ ch = UART_GET_DATA(port);
+ port->icount.rx++;

- if (!(uart_handle_sysrq_char(&uart->port, ch)))
- uart_insert_char(&uart->port, status, RXOERR, ch, flg);
+ if (!(uart_handle_sysrq_char(port, ch)))
+ uart_insert_char(port, status, RXOERR, ch, flg);

- spin_unlock(&uart->port.lock);
- tty_flip_buffer_push(&uart->port.state->port);
- spin_lock(&uart->port.lock);
- } while (!((status = UART_GET_STATUS(uart)) & RXEMPTY));
+ spin_unlock(&port->lock);
+ tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
+ } while (!((status = UART_GET_STATUS(port)) & RXEMPTY));
}

/*
@@ -287,10 +280,10 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)

static irqreturn_t arc_serial_isr(int irq, void *dev_id)
{
- struct arc_uart_port *uart = dev_id;
+ struct uart_port *port = dev_id;
unsigned int status;

- status = UART_GET_STATUS(uart);
+ status = UART_GET_STATUS(port);

/*
* Single IRQ for both Rx (data available) Tx (room available) Interrupt
@@ -300,9 +293,9 @@ static irqreturn_t arc_serial_isr(int irq, void *dev_id)
if (status & RXIENB) {

/* already in ISR, no need of xx_irqsave */
- spin_lock(&uart->port.lock);
- arc_serial_rx_chars(uart, status);
- spin_unlock(&uart->port.lock);
+ spin_lock(&port->lock);
+ arc_serial_rx_chars(port, status);
+ spin_unlock(&port->lock);
}

if ((status & TXIENB) && (status & TXEMPTY)) {
@@ -310,14 +303,14 @@ static irqreturn_t arc_serial_isr(int irq, void *dev_id)
/* Unconditionally disable further Tx-Interrupts.
* will be enabled by tx_chars() if needed.
*/
- UART_TX_IRQ_DISABLE(uart);
+ UART_TX_IRQ_DISABLE(port);

- spin_lock(&uart->port.lock);
+ spin_lock(&port->lock);

- if (!uart_tx_stopped(&uart->port))
- arc_serial_tx_chars(uart);
+ if (!uart_tx_stopped(port))
+ arc_serial_tx_chars(port);

- spin_unlock(&uart->port.lock);
+ spin_unlock(&port->lock);
}

return IRQ_HANDLED;
@@ -354,18 +347,15 @@ static void arc_serial_break_ctl(struct uart_port *port, int break_state)

static int arc_serial_startup(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
/* Before we hook up the ISR, Disable all UART Interrupts */
- UART_ALL_IRQ_DISABLE(uart);
+ UART_ALL_IRQ_DISABLE(port);

- if (request_irq(uart->port.irq, arc_serial_isr, 0, "arc uart rx-tx",
- uart)) {
- dev_warn(uart->port.dev, "Unable to attach ARC UART intr\n");
+ if (request_irq(port->irq, arc_serial_isr, 0, "arc uart rx-tx", port)) {
+ dev_warn(port->dev, "Unable to attach ARC UART intr\n");
return -EBUSY;
}

- UART_RX_IRQ_ENABLE(uart); /* Only Rx IRQ enabled to begin with */
+ UART_RX_IRQ_ENABLE(port); /* Only Rx IRQ enabled to begin with */

return 0;
}
@@ -373,8 +363,7 @@ static int arc_serial_startup(struct uart_port *port)
/* This is not really needed */
static void arc_serial_shutdown(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
- free_irq(uart->port.irq, uart);
+ free_irq(port->irq, port);
}

static void
@@ -411,12 +400,12 @@ arc_serial_set_termios(struct uart_port *port, struct ktermios *new,

spin_lock_irqsave(&port->lock, flags);

- UART_ALL_IRQ_DISABLE(uart);
+ UART_ALL_IRQ_DISABLE(port);

- UART_SET_BAUDL(uart, uartl);
- UART_SET_BAUDH(uart, uarth);
+ UART_SET_BAUDL(port, uartl);
+ UART_SET_BAUDH(port, uarth);

- UART_RX_IRQ_ENABLE(uart);
+ UART_RX_IRQ_ENABLE(port);

/*
* UART doesn't support Parity/Hardware Flow Control;
@@ -439,9 +428,7 @@ arc_serial_set_termios(struct uart_port *port, struct ktermios *new,

static const char *arc_serial_type(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
- return uart->port.type == PORT_ARC ? DRIVER_NAME : NULL;
+ return port->type == PORT_ARC ? DRIVER_NAME : NULL;
}

static void arc_serial_release_port(struct uart_port *port)
@@ -470,35 +457,30 @@ arc_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
*/
static void arc_serial_config_port(struct uart_port *port, int flags)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
if (flags & UART_CONFIG_TYPE)
- uart->port.type = PORT_ARC;
+ port->type = PORT_ARC;
}

#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_ARC_CONSOLE)

static void arc_serial_poll_putchar(struct uart_port *port, int chr)
{
- struct arc_uart_port *uart = to_arc_port(port);
-
- while (!(UART_GET_STATUS(uart) & TXEMPTY))
+ while (!(UART_GET_STATUS(port) & TXEMPTY))
cpu_relax();

- UART_SET_DATA(uart, (unsigned char)chr);
+ UART_SET_DATA(port, (unsigned char)chr);
}
#endif

#ifdef CONFIG_CONSOLE_POLL
static int arc_serial_poll_getchar(struct uart_port *port)
{
- struct arc_uart_port *uart = to_arc_port(port);
unsigned char chr;

- while (!(UART_GET_STATUS(uart) & RXEMPTY))
+ while (!(UART_GET_STATUS(port) & RXEMPTY))
cpu_relax();

- chr = UART_GET_DATA(uart);
+ chr = UART_GET_DATA(port);
return chr;
}
#endif
@@ -532,6 +514,7 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
struct resource *res, *res2;
unsigned long *plat_data;
struct arc_uart_port *uart = &arc_uart_ports[dev_id];
+ struct uart_port *port = &uart->port;

plat_data = dev_get_platdata(&pdev->dev);
if (!plat_data)
@@ -540,7 +523,7 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
uart->is_emulated = !!plat_data[0]; /* workaround ISS bug */

if (is_early_platform_device(pdev)) {
- uart->port.uartclk = plat_data[1];
+ port->uartclk = plat_data[1];
uart->baud = plat_data[2];
} else {
struct device_node *np = pdev->dev.of_node;
@@ -550,7 +533,7 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
dev_err(&pdev->dev, "clock-frequency property NOTset\n");
return -EINVAL;
}
- uart->port.uartclk = val;
+ port->uartclk = val;

if (of_property_read_u32(np, "current-speed", &val)) {
dev_err(&pdev->dev, "current-speed property NOT set\n");
@@ -567,26 +550,26 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
if (!res2)
return -ENODEV;

- uart->port.mapbase = res->start;
- uart->port.membase = ioremap_nocache(res->start, resource_size(res));
- if (!uart->port.membase)
+ port->mapbase = res->start;
+ port->membase = ioremap_nocache(res->start, resource_size(res));
+ if (!port->membase)
/* No point of dev_err since UART itself is hosed here */
return -ENXIO;

- uart->port.irq = res2->start;
- uart->port.dev = &pdev->dev;
- uart->port.iotype = UPIO_MEM;
- uart->port.flags = UPF_BOOT_AUTOCONF;
- uart->port.line = dev_id;
- uart->port.ops = &arc_serial_pops;
+ port->irq = res2->start;
+ port->dev = &pdev->dev;
+ port->iotype = UPIO_MEM;
+ port->flags = UPF_BOOT_AUTOCONF;
+ port->line = dev_id;
+ port->ops = &arc_serial_pops;

- uart->port.fifosize = ARC_UART_TX_FIFO_SIZE;
+ port->fifosize = ARC_UART_TX_FIFO_SIZE;

/*
* uart_insert_char( ) uses it in decideding whether to ignore a
* char or not. Explicitly setting it here, removes the subtelty
*/
- uart->port.ignore_status_mask = 0;
+ port->ignore_status_mask = 0;

return 0;
}
--
1.8.3.2


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