[V2,0/2] serial: sprd: Modification of UNISOC Platform UART Driver

In order to be compatible with UNISOC's new UART IP, the UART driver uses
private data for adaptation. Patch1 adds UART timeout interrupt BIT17, and
the old project uses BIT13. In order to be compatible with all projects,
private data is used for adaptation. Patch2 adds a new compatible string.

Change in V2:
-Change commit message in PATCH 2/2.
-Add a new items supports sc9832 compatible string in PATCH 2/2.

Wenhua Lin (2):
  dt-bindings: serial: Add a new compatible string for UMS9632
  serial: sprd: Add support for sc9632

 .../devicetree/bindings/serial/sprd-uart.yaml |  5 +++
 drivers/tty/serial/sprd_serial.c              | 41 ++++++++++++++++---
 2 files changed, 41 insertions(+), 5 deletions(-)

On Mon, Jan 13, 2025 at 3:13 PM Chunyan Zhang <zhang.lyra@gmail.com> wrote:
>
> On Mon, 13 Jan 2025 at 11:20, Wenhua Lin <Wenhua.Lin@unisoc.com> wrote:
> >
> > Due to the platform's new project uart ip upgrade,
> > the new project's timeout interrupt needs to use bit17
> > while other projects' timeout interrupt needs to use
> > bit13, using private data to adapt and be compatible
> > with all projects.
> >
>
> It seems that this patch has got merged into the last release, why do
> you resend this?

Hi Chunyan:
  I'm sorry, I didn't realize that this commit had already been merged.
  I resubmitted PATCH V2 to fix the issue with tags[1].
  I made a mistake. Thank you for reminding me.

Thanks

>
> > Signed-off-by: Wenhua Lin <Wenhua.Lin@unisoc.com>
> > ---
> >  drivers/tty/serial/sprd_serial.c | 41 ++++++++++++++++++++++++++++----
> >  1 file changed, 36 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
> > index 3fc54cc02a1f..882580c3cf37 100644
> > --- a/drivers/tty/serial/sprd_serial.c
> > +++ b/drivers/tty/serial/sprd_serial.c
> > @@ -53,10 +53,12 @@
> >  #define SPRD_IEN_TX_EMPTY      BIT(1)
> >  #define SPRD_IEN_BREAK_DETECT  BIT(7)
> >  #define SPRD_IEN_TIMEOUT       BIT(13)
> > +#define SPRD_IEN_DATA_TIMEOUT  BIT(17)
> >
> >  /* interrupt clear register */
> >  #define SPRD_ICLR              0x0014
> >  #define SPRD_ICLR_TIMEOUT      BIT(13)
> > +#define SPRD_ICLR_DATA_TIMEOUT BIT(17)
> >
> >  /* line control register */
> >  #define SPRD_LCR               0x0018
> > @@ -102,6 +104,7 @@
> >  #define SPRD_IMSR_TX_FIFO_EMPTY        BIT(1)
> >  #define SPRD_IMSR_BREAK_DETECT BIT(7)
> >  #define SPRD_IMSR_TIMEOUT      BIT(13)
> > +#define SPRD_IMSR_DATA_TIMEOUT BIT(17)
> >  #define SPRD_DEFAULT_SOURCE_CLK        26000000
> >
> >  #define SPRD_RX_DMA_STEP       1
> > @@ -118,6 +121,12 @@ struct sprd_uart_dma {
> >         bool enable;
> >  };
> >
> > +struct sprd_uart_data {
> > +       unsigned int timeout_ien;
> > +       unsigned int timeout_iclr;
> > +       unsigned int timeout_imsr;
> > +};
> > +
> >  struct sprd_uart_port {
> >         struct uart_port port;
> >         char name[16];
> > @@ -126,6 +135,7 @@ struct sprd_uart_port {
> >         struct sprd_uart_dma rx_dma;
> >         dma_addr_t pos;
> >         unsigned char *rx_buf_tail;
> > +       const struct sprd_uart_data *pdata;
> >  };
> >
> >  static struct sprd_uart_port *sprd_port[UART_NR_MAX];
> > @@ -134,6 +144,18 @@ static int sprd_ports_num;
> >  static int sprd_start_dma_rx(struct uart_port *port);
> >  static int sprd_tx_dma_config(struct uart_port *port);
> >
> > +static const struct sprd_uart_data sc9836_data = {
> > +       .timeout_ien = SPRD_IEN_TIMEOUT,
> > +       .timeout_iclr = SPRD_ICLR_TIMEOUT,
> > +       .timeout_imsr = SPRD_IMSR_TIMEOUT,
> > +};
> > +
> > +static const struct sprd_uart_data sc9632_data = {
> > +       .timeout_ien = SPRD_IEN_DATA_TIMEOUT,
> > +       .timeout_iclr = SPRD_ICLR_DATA_TIMEOUT,
> > +       .timeout_imsr = SPRD_IMSR_DATA_TIMEOUT,
> > +};
> > +
> >  static inline unsigned int serial_in(struct uart_port *port,
> >                                      unsigned int offset)
> >  {
> > @@ -637,6 +659,8 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
> >  {
> >         struct uart_port *port = dev_id;
> >         unsigned int ims;
> > +       struct sprd_uart_port *sp =
> > +               container_of(port, struct sprd_uart_port, port);
> >
> >         uart_port_lock(port);
> >
> > @@ -647,14 +671,14 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
> >                 return IRQ_NONE;
> >         }
> >
> > -       if (ims & SPRD_IMSR_TIMEOUT)
> > -               serial_out(port, SPRD_ICLR, SPRD_ICLR_TIMEOUT);
> > +       if (ims & sp->pdata->timeout_imsr)
> > +               serial_out(port, SPRD_ICLR, sp->pdata->timeout_iclr);
> >
> >         if (ims & SPRD_IMSR_BREAK_DETECT)
> >                 serial_out(port, SPRD_ICLR, SPRD_IMSR_BREAK_DETECT);
> >
> >         if (ims & (SPRD_IMSR_RX_FIFO_FULL | SPRD_IMSR_BREAK_DETECT |
> > -                  SPRD_IMSR_TIMEOUT))
> > +                  sp->pdata->timeout_imsr))
> >                 sprd_rx(port);
> >
> >         if (ims & SPRD_IMSR_TX_FIFO_EMPTY)
> > @@ -729,7 +753,7 @@ static int sprd_startup(struct uart_port *port)
> >         /* enable interrupt */
> >         uart_port_lock_irqsave(port, &flags);
> >         ien = serial_in(port, SPRD_IEN);
> > -       ien |= SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT;
> > +       ien |= SPRD_IEN_BREAK_DETECT | sp->pdata->timeout_ien;
> >         if (!sp->rx_dma.enable)
> >                 ien |= SPRD_IEN_RX_FULL;
> >         serial_out(port, SPRD_IEN, ien);
> > @@ -1184,6 +1208,12 @@ static int sprd_probe(struct platform_device *pdev)
> >
> >         up->mapbase = res->start;
> >
> > +       sport->pdata = of_device_get_match_data(&pdev->dev);
> > +       if (!sport->pdata) {
> > +               dev_err(&pdev->dev, "get match data failed!\n");
> > +               return -EINVAL;
> > +       }
> > +
> >         irq = platform_get_irq(pdev, 0);
> >         if (irq < 0)
> >                 return irq;
> > @@ -1248,7 +1278,8 @@ static int sprd_resume(struct device *dev)
> >  static SIMPLE_DEV_PM_OPS(sprd_pm_ops, sprd_suspend, sprd_resume);
> >
> >  static const struct of_device_id serial_ids[] = {
> > -       {.compatible = "sprd,sc9836-uart",},
> > +       {.compatible = "sprd,sc9836-uart", .data = &sc9836_data},
> > +       {.compatible = "sprd,sc9632-uart", .data = &sc9632_data},
> >         {}
> >  };
> >  MODULE_DEVICE_TABLE(of, serial_ids);
> > --
> > 2.34.1
> >