diff options
| author |   Soren Brinkmann <soren.brinkmann@xilinx.com> | 2014-04-04 17:23:41 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-24 16:21:51 -0700 |
| commit | 35dc5a538fb54bc30bdedf4c825da5c970b5ff90 (patch) | |
| tree | 1f00c2427bfd8fe320757cab5df2ef04606c6243 /drivers/tty/serial/xilinx_uartps.c | |
| parent | tty: xuartps: Print warning in clock notifier (diff) | |
| download | linux-dev-35dc5a538fb54bc30bdedf4c825da5c970b5ff90.tar.xz linux-dev-35dc5a538fb54bc30bdedf4c825da5c970b5ff90.zip | |
tty: xuartps: Refactor read-modify-writes
A lot of read-modify-write sequences used a one-line statement which
nests a readl() within a writel(). Convert this into code sequences that
make the three steps more obvious.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/xilinx_uartps.c')
| -rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 52 |
1 files changed, 24 insertions, 28 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 814391038abb..b182ab8cfd07 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -437,9 +437,9 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb, spin_lock_irqsave(&xuartps->port->lock, flags); /* Disable the TX and RX to set baud rate */ - xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) | - (XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS), - XUARTPS_CR_OFFSET); + ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); + ctrl_reg |= XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); spin_unlock_irqrestore(&xuartps->port->lock, flags); @@ -464,9 +464,9 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb, spin_lock_irqsave(&xuartps->port->lock, flags); /* Set TX/RX Reset */ - xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) | - (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST), - XUARTPS_CR_OFFSET); + ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); + ctrl_reg |= XUARTPS_CR_TXRST | XUARTPS_CR_RXRST; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); while (xuartps_readl(XUARTPS_CR_OFFSET) & (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST)) @@ -479,10 +479,9 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb, */ xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET); ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); - xuartps_writel( - (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) | - (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN), - XUARTPS_CR_OFFSET); + ctrl_reg &= ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS); + ctrl_reg |= XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); spin_unlock_irqrestore(&xuartps->port->lock, flags); @@ -631,9 +630,9 @@ static void xuartps_set_termios(struct uart_port *port, } /* Disable the TX and RX to set baud rate */ - xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) | - (XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS), - XUARTPS_CR_OFFSET); + ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); + ctrl_reg |= XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); /* * Min baud rate = 6bps and Max Baud Rate is 10Mbps for 100Mhz clk @@ -651,20 +650,18 @@ static void xuartps_set_termios(struct uart_port *port, uart_update_timeout(port, termios->c_cflag, baud); /* Set TX/RX Reset */ - xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) | - (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST), - XUARTPS_CR_OFFSET); - ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); + ctrl_reg |= XUARTPS_CR_TXRST | XUARTPS_CR_RXRST; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); /* * Clear the RX disable and TX disable bits and then set the TX enable * bit and RX enable bit to enable the transmitter and receiver. */ - xuartps_writel( - (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) - | (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN), - XUARTPS_CR_OFFSET); + ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); + ctrl_reg &= ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS); + ctrl_reg |= XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET); @@ -1248,9 +1245,9 @@ static int xuartps_resume(struct device *device) spin_lock_irqsave(&port->lock, flags); /* Set TX/RX Reset */ - xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) | - (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST), - XUARTPS_CR_OFFSET); + ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); + ctrl_reg |= XUARTPS_CR_TXRST | XUARTPS_CR_RXRST; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); while (xuartps_readl(XUARTPS_CR_OFFSET) & (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST)) cpu_relax(); @@ -1259,10 +1256,9 @@ static int xuartps_resume(struct device *device) xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET); /* Enable Tx/Rx */ ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); - xuartps_writel( - (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) | - (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN), - XUARTPS_CR_OFFSET); + ctrl_reg &= ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS); + ctrl_reg |= XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN; + xuartps_writel(ctrl_reg, XUARTPS_CR_OFFSET); spin_unlock_irqrestore(&port->lock, flags); } else { |