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Message-ID: <CAPLW+4mh2j-eu8n70HotaHQz3P8VP9vvKDOyUNqPj3-btr-AyA@mail.gmail.com>
Date: Tue, 16 Jan 2024 12:17:09 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: krzysztof.kozlowski@...aro.org, alim.akhtar@...sung.com,
gregkh@...uxfoundation.org, jirislaby@...nel.org,
linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
andre.draszik@...aro.org, peter.griffin@...aro.org, kernel-team@...roid.com,
willmcvicker@...gle.com
Subject: Re: [PATCH 06/18] tty: serial: samsung: use u32 for register interactions
On Wed, Jan 10, 2024 at 4:22 AM Tudor Ambarus <tudor.ambarus@...aroorg> wrote:
>
> All registers of the IP have 32 bits. Use u32 variables when reading
> or writing from/to the registers. The purpose of those variables becomes
> clearer.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---
Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
> drivers/tty/serial/samsung_tty.c | 79 ++++++++++++++++----------------
> 1 file changed, 39 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index b8b71a0109ea..d5f9bec24b8e 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -199,7 +199,7 @@ static void wr_reg(const struct uart_port *port, u32 reg, u32 val)
> /* Byte-order aware bit setting/clearing functions. */
>
> static inline void s3c24xx_set_bit(const struct uart_port *port, int idx,
> - unsigned int reg)
> + u32 reg)
> {
> unsigned long flags;
> u32 val;
> @@ -212,7 +212,7 @@ static inline void s3c24xx_set_bit(const struct uart_port *port, int idx,
> }
>
> static inline void s3c24xx_clear_bit(const struct uart_port *port, int idx,
> - unsigned int reg)
> + u32 reg)
> {
> unsigned long flags;
> u32 val;
> @@ -245,8 +245,8 @@ static void s3c24xx_serial_rx_enable(struct uart_port *port)
> {
> struct s3c24xx_uart_port *ourport = to_ourport(port);
> unsigned long flags;
> - unsigned int ucon, ufcon;
> int count = 10000;
> + u32 ucon, ufcon;
>
> uart_port_lock_irqsave(port, &flags);
>
> @@ -269,7 +269,7 @@ static void s3c24xx_serial_rx_disable(struct uart_port *port)
> {
> struct s3c24xx_uart_port *ourport = to_ourport(port);
> unsigned long flags;
> - unsigned int ucon;
> + u32 ucon;
>
> uart_port_lock_irqsave(port, &flags);
>
> @@ -591,7 +591,7 @@ static inline const struct s3c2410_uartcfg
> }
>
> static int s3c24xx_serial_rx_fifocnt(const struct s3c24xx_uart_port *ourport,
> - unsigned long ufstat)
> + u32 ufstat)
> {
> const struct s3c24xx_uart_info *info = ourport->info;
>
> @@ -663,7 +663,7 @@ static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
> static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
> {
> struct uart_port *port = &ourport->port;
> - unsigned int ucon;
> + u32 ucon;
>
> /* set Rx mode to DMA mode */
> ucon = rd_regl(port, S3C2410_UCON);
> @@ -686,7 +686,7 @@ static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
> static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
> {
> struct uart_port *port = &ourport->port;
> - unsigned int ucon;
> + u32 ucon;
>
> /* set Rx mode to DMA mode */
> ucon = rd_regl(port, S3C2410_UCON);
> @@ -711,13 +711,14 @@ static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
>
> static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
> {
> - unsigned int utrstat, received;
> struct s3c24xx_uart_port *ourport = dev_id;
> struct uart_port *port = &ourport->port;
> struct s3c24xx_uart_dma *dma = ourport->dma;
> struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
> struct tty_port *t = &port->state->port;
> struct dma_tx_state state;
> + unsigned int received;
> + u32 utrstat;
>
> utrstat = rd_regl(port, S3C2410_UTRSTAT);
> rd_regl(port, S3C2410_UFSTAT);
> @@ -759,9 +760,9 @@ static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
> static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
> {
> struct uart_port *port = &ourport->port;
> - unsigned int ufcon, ufstat, uerstat;
> unsigned int fifocnt = 0;
> int max_count = port->fifosize;
> + u32 ufcon, ufstat, uerstat;
> u8 ch, flag;
>
> while (max_count-- > 0) {
> @@ -945,7 +946,7 @@ static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
> {
> const struct s3c24xx_uart_port *ourport = id;
> const struct uart_port *port = &ourport->port;
> - unsigned int pend = rd_regl(port, S3C64XX_UINTP);
> + u32 pend = rd_regl(port, S3C64XX_UINTP);
> irqreturn_t ret = IRQ_HANDLED;
>
> if (pend & S3C64XX_UINTM_RXD_MSK) {
> @@ -964,7 +965,7 @@ static irqreturn_t apple_serial_handle_irq(int irq, void *id)
> {
> const struct s3c24xx_uart_port *ourport = id;
> const struct uart_port *port = &ourport->port;
> - unsigned int pend = rd_regl(port, S3C2410_UTRSTAT);
> + u32 pend = rd_regl(port, S3C2410_UTRSTAT);
> irqreturn_t ret = IRQ_NONE;
>
> if (pend & (APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO)) {
> @@ -983,8 +984,8 @@ static irqreturn_t apple_serial_handle_irq(int irq, void *id)
> static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
> {
> const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
> - unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
> - unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
> + u32 ufstat = rd_regl(port, S3C2410_UFSTAT);
> + u32 ufcon = rd_regl(port, S3C2410_UFCON);
>
> if (ufcon & S3C2410_UFCON_FIFOMODE) {
> if ((ufstat & info->tx_fifomask) != 0 ||
> @@ -1000,7 +1001,7 @@ static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
> /* no modem control lines */
> static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
> {
> - unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
> + u32 umstat = rd_reg(port, S3C2410_UMSTAT);
>
> if (umstat & S3C2410_UMSTAT_CTS)
> return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
> @@ -1010,8 +1011,8 @@ static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
>
> static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
> {
> - unsigned int umcon = rd_regl(port, S3C2410_UMCON);
> - unsigned int ucon = rd_regl(port, S3C2410_UCON);
> + u32 umcon = rd_regl(port, S3C2410_UMCON);
> + u32 ucon = rd_regl(port, S3C2410_UCON);
>
> if (mctrl & TIOCM_RTS)
> umcon |= S3C2410_UMCOM_RTS_LOW;
> @@ -1031,7 +1032,7 @@ static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
> static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
> {
> unsigned long flags;
> - unsigned int ucon;
> + u32 ucon;
>
> uart_port_lock_irqsave(port, &flags);
>
> @@ -1189,7 +1190,7 @@ static void apple_s5l_serial_shutdown(struct uart_port *port)
> {
> struct s3c24xx_uart_port *ourport = to_ourport(port);
>
> - unsigned int ucon;
> + u32 ucon;
>
> ucon = rd_regl(port, S3C2410_UCON);
> ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
> @@ -1215,7 +1216,7 @@ static int s3c64xx_serial_startup(struct uart_port *port)
> {
> struct s3c24xx_uart_port *ourport = to_ourport(port);
> unsigned long flags;
> - unsigned int ufcon;
> + u32 ufcon;
> int ret;
>
> wr_regl(port, S3C64XX_UINTM, 0xf);
> @@ -1260,7 +1261,7 @@ static int apple_s5l_serial_startup(struct uart_port *port)
> {
> struct s3c24xx_uart_port *ourport = to_ourport(port);
> unsigned long flags;
> - unsigned int ufcon;
> + u32 ufcon;
> int ret;
>
> wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
> @@ -1345,7 +1346,7 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
> static inline int s3c24xx_serial_getsource(struct uart_port *port)
> {
> const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
> - unsigned int ucon;
> + u32 ucon;
>
> if (info->num_clks == 1)
> return 0;
> @@ -1359,7 +1360,7 @@ static void s3c24xx_serial_setsource(struct uart_port *port,
> unsigned int clk_sel)
> {
> const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
> - unsigned int ucon;
> + u32 ucon;
>
> if (info->num_clks == 1)
> return;
> @@ -1476,9 +1477,8 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
> struct clk *clk = ERR_PTR(-EINVAL);
> unsigned long flags;
> unsigned int baud, quot, clk_sel = 0;
> - unsigned int ulcon;
> - unsigned int umcon;
> unsigned int udivslot = 0;
> + u32 ulcon, umcon;
>
> /*
> * We don't support modem control lines.
> @@ -1760,7 +1760,7 @@ static void s3c24xx_serial_resetport(struct uart_port *port,
> const struct s3c2410_uartcfg *cfg)
> {
> const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
> - unsigned long ucon = rd_regl(port, S3C2410_UCON);
> + u32 ucon = rd_regl(port, S3C2410_UCON);
>
> ucon &= (info->clksel_mask | info->ucon_mask);
> wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
> @@ -1906,7 +1906,7 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
> wr_regl(port, S3C64XX_UINTSP, 0xf);
> break;
> case TYPE_APPLE_S5L: {
> - unsigned int ucon;
> + u32 ucon;
>
> ucon = rd_regl(port, S3C2410_UCON);
> ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
> @@ -2110,7 +2110,7 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
> /* restore IRQ mask */
> switch (ourport->info->type) {
> case TYPE_S3C6400: {
> - unsigned int uintm = 0xf;
> + u32 uintm = 0xf;
>
> if (ourport->tx_enabled)
> uintm &= ~S3C64XX_UINTM_TXD_MSK;
> @@ -2126,7 +2126,7 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
> break;
> }
> case TYPE_APPLE_S5L: {
> - unsigned int ucon;
> + u32 ucon;
> int ret;
>
> ret = clk_prepare_enable(ourport->clk);
> @@ -2188,10 +2188,10 @@ static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
> static struct uart_port *cons_uart;
>
> static int
> -s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
> +s3c24xx_serial_console_txrdy(struct uart_port *port, u32 ufcon)
> {
> const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
> - unsigned long ufstat, utrstat;
> + u32 ufstat, utrstat;
>
> if (ufcon & S3C2410_UFCON_FIFOMODE) {
> /* fifo mode - check amount of data in fifo registers... */
> @@ -2207,7 +2207,7 @@ s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
> }
>
> static bool
> -s3c24xx_port_configured(unsigned int ucon)
> +s3c24xx_port_configured(u32 ucon)
> {
> /* consider the serial port configured if the tx/rx mode set */
> return (ucon & 0xf) != 0;
> @@ -2222,7 +2222,7 @@ s3c24xx_port_configured(unsigned int ucon)
> static int s3c24xx_serial_get_poll_char(struct uart_port *port)
> {
> const struct s3c24xx_uart_port *ourport = to_ourport(port);
> - unsigned int ufstat;
> + u32 ufstat;
>
> ufstat = rd_regl(port, S3C2410_UFSTAT);
> if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
> @@ -2234,8 +2234,8 @@ static int s3c24xx_serial_get_poll_char(struct uart_port *port)
> static void s3c24xx_serial_put_poll_char(struct uart_port *port,
> unsigned char c)
> {
> - unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
> - unsigned int ucon = rd_regl(port, S3C2410_UCON);
> + u32 ufcon = rd_regl(port, S3C2410_UFCON);
> + u32 ucon = rd_regl(port, S3C2410_UCON);
>
> /* not possible to xmit on unconfigured port */
> if (!s3c24xx_port_configured(ucon))
> @@ -2251,7 +2251,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
> static void
> s3c24xx_serial_console_putchar(struct uart_port *port, unsigned char ch)
> {
> - unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
> + u32 ufcon = rd_regl(port, S3C2410_UFCON);
>
> while (!s3c24xx_serial_console_txrdy(port, ufcon))
> cpu_relax();
> @@ -2262,7 +2262,7 @@ static void
> s3c24xx_serial_console_write(struct console *co, const char *s,
> unsigned int count)
> {
> - unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
> + u32 ucon = rd_regl(cons_uart, S3C2410_UCON);
> unsigned long flags;
> bool locked = true;
>
> @@ -2289,11 +2289,9 @@ s3c24xx_serial_get_options(struct uart_port *port, int *baud,
> int *parity, int *bits)
> {
> struct clk *clk;
> - unsigned int ulcon;
> - unsigned int ucon;
> - unsigned int ubrdiv;
> unsigned long rate;
> unsigned int clk_sel;
> + u32 ulcon, ucon, ubrdiv;
> char clk_name[MAX_CLK_NAME_LENGTH];
>
> ulcon = rd_regl(port, S3C2410_ULCON);
> @@ -2743,7 +2741,8 @@ static int samsung_early_read(struct console *con, char *s, unsigned int n)
> {
> struct earlycon_device *dev = con->data;
> const struct samsung_early_console_data *data = dev->port.private_data;
> - int ch, ufstat, num_read = 0;
> + int num_read = 0;
> + u32 ch, ufstat;
>
> while (num_read < n) {
> ufstat = rd_regl(&dev->port, S3C2410_UFSTAT);
> --
> 2.43.0.472.g3155946c3a-goog
>
>
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