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Date: Fri, 3 Apr 2020 19:19:30 +0900
From: "Hyunki Koo" <hyunki00.koo@...sung.com>
To: "'Krzysztof Kozlowski'" <krzk@...nel.org>
Cc: <gregkh@...uxfoundation.org>, "'Kukjin Kim'" <kgene@...nel.org>,
"'Jiri Slaby'" <jslaby@...e.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-samsung-soc@...r.kernel.org>,
<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] tty: samsung_tty: 32-bit access for TX/RX hold
registers
On Thu, Apr 02, 2020 at 4:51:29PM +0900, Krzysztof Kozlowski
> On Fri, Apr 03, 2020 at 04:30:38PM +0900, Hyunki Koo wrote:
> > On Thu, Apr 02, 2020 at 10:59:29PM +0900, Krzysztof Kozlowski
> > > On Thu, Apr 02, 2020 at 08:04:29PM +0900, Hyunki Koo wrote:
> > > > Support 32-bit access for the TX/RX hold registers UTXH and URXH.
> > > >
> > > > This is required for some newer SoCs.
> > > >
> > > > Signed-off-by: Hyunki Koo <hyunki00.koo@...sung.com>
> > > > ---
> > > > drivers/tty/serial/samsung_tty.c | 78
> > > > +++++++++++++++++++++++++++++++++-------
> > > > 1 file changed, 66 insertions(+), 12 deletions(-)
> > > >
> > > > diff --git a/drivers/tty/serial/samsung_tty.c
> > > > b/drivers/tty/serial/samsung_tty.c
> > > > index 73f951d65b93..826d8c5846a6 100644
> > > > --- a/drivers/tty/serial/samsung_tty.c
> > > > +++ b/drivers/tty/serial/samsung_tty.c
> > > > @@ -154,12 +154,47 @@ struct s3c24xx_uart_port { #define
> > > > portaddrl(port, reg) \
> > > > ((unsigned long *)(unsigned long)((port)->membase + (reg)))
> > > >
> > > > -#define rd_regb(port, reg) (readb_relaxed(portaddr(port, reg)))
> > > > +static unsigned int rd_reg(struct uart_port *port, int reg) {
> > > > + switch (port->iotype) {
> > > > + case UPIO_MEM:
> > > > + return readb_relaxed(portaddr(port, reg));
> > > > + case UPIO_MEM32:
> > > > + return readl_relaxed(portaddr(port, reg));
> > > > + default:
> > > > + return 0;
> > > > + }
> > > > + return 0;
> > > > +}
> > > > +
> > > > #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
> > > >
> > > > -#define wr_regb(port, reg, val) writeb_relaxed(val,
> > > > portaddr(port,
> > > > reg))
> > > > +static void wr_reg(struct uart_port *port, int reg, int val) {
> > > > + switch (port->iotype) {
> > > > + case UPIO_MEM:
> > > > + writeb_relaxed(val, portaddr(port, reg));
> > > > + break;
> > > > + case UPIO_MEM32:
> > > > + writel_relaxed(val, portaddr(port, reg));
> > > > + break;
> > > > + }
> > > > +}
> > > > +
> > > > #define wr_regl(port, reg, val) writel_relaxed(val,
> > > > portaddr(port,
> > > > reg))
> > > >
> > > > +static void write_buf(struct uart_port *port, int reg, int val) {
> > > > + switch (port->iotype) {
> > > > + case UPIO_MEM:
> > > > + writeb(val, portaddr(port, reg));
> > > > + break;
> > > > + case UPIO_MEM32:
> > > > + writel(val, portaddr(port, reg));
> > > > + break;
> > > > + }
> > > > +}
> > > > +
> > > > /* Byte-order aware bit setting/clearing functions. */
> > > >
> > > > static inline void s3c24xx_set_bit(struct uart_port *port, int
> > > > idx, @@ -714,7 +749,7 @@ static void
> > > > s3c24xx_serial_rx_drain_fifo(struct
> > > s3c24xx_uart_port *ourport)
> > > > fifocnt--;
> > > >
> > > > uerstat = rd_regl(port, S3C2410_UERSTAT);
> > > > - ch = rd_regb(port, S3C2410_URXH);
> > > > + ch = rd_reg(port, S3C2410_URXH);
> > > >
> > > > if (port->flags & UPF_CONS_FLOW) {
> > > > int txe = s3c24xx_serial_txempty_nofifo(port);
> > > > @@ -826,7 +861,7 @@ static irqreturn_t
> s3c24xx_serial_tx_chars(int
> > > irq, void *id)
> > > > }
> > > >
> > > > if (port->x_char) {
> > > > - wr_regb(port, S3C2410_UTXH, port->x_char);
> > > > + wr_reg(port, S3C2410_UTXH, port->x_char);
> > > > port->icount.tx++;
> > > > port->x_char = 0;
> > > > goto out;
> > > > @@ -852,7 +887,7 @@ static irqreturn_t
> s3c24xx_serial_tx_chars(int
> > > irq, void *id)
> > > > if (rd_regl(port, S3C2410_UFSTAT) & ourport->info-
> > > >tx_fifofull)
> > > > break;
> > > >
> > > > - wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
> > > > + wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
> > > > xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> > > > port->icount.tx++;
> > > > count--;
> > > > @@ -916,7 +951,7 @@ 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_regb(port, S3C2410_UMSTAT);
> > > > + unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
> > > >
> > > > if (umstat & S3C2410_UMSTAT_CTS)
> > > > return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; @@ -
> > > 1974,7 +2009,7 @@
> > > > static int s3c24xx_serial_probe(struct platform_device *pdev)
> > > > struct device_node *np = pdev->dev.of_node;
> > > > struct s3c24xx_uart_port *ourport;
> > > > int index = probe_index;
> > > > - int ret;
> > > > + int ret, prop = 0;
> > > >
> > > > if (np) {
> > > > ret = of_alias_get_id(np, "serial"); @@ -2000,10
> > > +2035,29 @@ static
> > > > int s3c24xx_serial_probe(struct platform_device *pdev)
> > > > dev_get_platdata(&pdev->dev) :
> > > > ourport->drv_data->def_cfg;
> > > >
> > > > - if (np)
> > > > + if (np) {
> > > > of_property_read_u32(np,
> > > > "samsung,uart-fifosize", &ourport->port.fifosize);
> > > >
> > > > + if (of_property_read_u32(np, "reg-io-width", &prop) ==
> > > 0) {
> > > > + switch (prop) {
> > > > + case 1:
> > > > + ourport->port.iotype = UPIO_MEM;
> > > > + break;
> > > > + case 4:
> > > > + ourport->port.iotype = UPIO_MEM32;
> > > > + break;
> > > > + default:
> > > > + dev_warn(&pdev->dev, "unsupported
> > > reg-io-width (%d)\n",
> > > > + prop);
> > > > + ret = -EINVAL;
> > > > + break;
> > > > + }
> > > > + } else {
> > > > + ourport->port.iotype = UPIO_MEM;
> > > > + }
> > > > + }
> > >
> > > I think this still breaks all non-DT platforms (e.g. s3c).
> > >
> > > Best regards,
> > > Krzysztof
> >
> > Thank you for your comment.
> > I hope ourport->port.iotype is initialized by below table for non-DT
> > platforms
>
> Indeed, you're right. In this case, this else() you added is not needed.
> The default value for non-DT and existing DT platforms will be the same
> (UPIO_MEM).
>
> Best regards,
> Krzysztof
Thank you for your comment.
I will remove this line also in v3
+ } else {
+ ourport->port.iotype = UPIO_MEM;
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