Re: [PATCH v2] serial: amba-pl011: complete support to ZTE uart

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2016-04-29 4:11 GMT+08:00 Greg KH <greg@xxxxxxxxx>:
> On Mon, Apr 25, 2016 at 02:53:02PM +0800, Jun Nie wrote:
>> 2016-04-12 21:01 GMT+08:00 Jun Nie <jun.nie@xxxxxxxxxx>:
>> > On 2016年04月01日 17:53, Jun Nie wrote:
>> >>
>> >> 2016-03-23 15:12 GMT+08:00 Jun Nie <jun.nie@xxxxxxxxxx>:
>> >>>
>> >>> Complete support to ZTE uart with adding specific registers
>> >>> mask.
>> >>> We use a magic amba periphid value as pl011 device on ZTE
>> >>> does not have a periphid value in register. The magic value
>> >>> should also be feed via device tree "arm,primecell-periphid"
>> >>> property to match pl011 driver and get ZTE uart data.
>> >>>
>> >>> Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
>> >>> ---
>> >>>   drivers/tty/serial/amba-pl011.c | 73
>> >>> +++++++++++++++++++++++++++++++++--------
>> >>>   include/linux/amba/serial.h     |  4 +++
>> >>>   2 files changed, 64 insertions(+), 13 deletions(-)
>> >>>
>> >>> diff --git a/drivers/tty/serial/amba-pl011.c
>> >>> b/drivers/tty/serial/amba-pl011.c
>> >>> index 7c198e0..696ee0c 100644
>> >>> --- a/drivers/tty/serial/amba-pl011.c
>> >>> +++ b/drivers/tty/serial/amba-pl011.c
>> >>> @@ -93,6 +93,10 @@ static u16 pl011_std_offsets[REG_ARRAY_SIZE] = {
>> >>>   struct vendor_data {
>> >>>          const u16               *reg_offset;
>> >>>          unsigned int            ifls;
>> >>> +       unsigned int            fr_busy;
>> >>> +       unsigned int            fr_dsr;
>> >>> +       unsigned int            fr_cts;
>> >>> +       unsigned int            fr_ri;
>> >>>          bool                    access_32b;
>> >>>          bool                    oversampling;
>> >>>          bool                    dma_threshold;
>> >>> @@ -111,6 +115,10 @@ static unsigned int get_fifosize_arm(struct
>> >>> amba_device *dev)
>> >>>   static struct vendor_data vendor_arm = {
>> >>>          .reg_offset             = pl011_std_offsets,
>> >>>          .ifls                   = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
>> >>> +       .fr_busy                = UART01x_FR_BUSY,
>> >>> +       .fr_dsr                 = UART01x_FR_DSR,
>> >>> +       .fr_cts                 = UART01x_FR_CTS,
>> >>> +       .fr_ri                  = UART011_FR_RI,
>> >>>          .oversampling           = false,
>> >>>          .dma_threshold          = false,
>> >>>          .cts_event_workaround   = false,
>> >>> @@ -121,6 +129,10 @@ static struct vendor_data vendor_arm = {
>> >>>
>> >>>   static struct vendor_data vendor_sbsa = {
>> >>>          .reg_offset             = pl011_std_offsets,
>> >>> +       .fr_busy                = UART01x_FR_BUSY,
>> >>> +       .fr_dsr                 = UART01x_FR_DSR,
>> >>> +       .fr_cts                 = UART01x_FR_CTS,
>> >>> +       .fr_ri                  = UART011_FR_RI,
>> >>>          .oversampling           = false,
>> >>>          .dma_threshold          = false,
>> >>>          .cts_event_workaround   = false,
>> >>> @@ -163,6 +175,10 @@ static unsigned int get_fifosize_st(struct
>> >>> amba_device *dev)
>> >>>   static struct vendor_data vendor_st = {
>> >>>          .reg_offset             = pl011_st_offsets,
>> >>>          .ifls                   =
>> >>> UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
>> >>> +       .fr_busy                = UART01x_FR_BUSY,
>> >>> +       .fr_dsr                 = UART01x_FR_DSR,
>> >>> +       .fr_cts                 = UART01x_FR_CTS,
>> >>> +       .fr_ri                  = UART011_FR_RI,
>> >>>          .oversampling           = true,
>> >>>          .dma_threshold          = true,
>> >>>          .cts_event_workaround   = true,
>> >>> @@ -187,11 +203,25 @@ static const u16 pl011_zte_offsets[REG_ARRAY_SIZE]
>> >>> = {
>> >>>          [REG_DMACR] = ZX_UART011_DMACR,
>> >>>   };
>> >>>
>> >>> +static unsigned int get_fifosize_zte(struct amba_device *dev)
>> >>> +{
>> >>> +       return 16;
>> >>> +}
>> >>> +
>> >>>   static struct vendor_data vendor_zte __maybe_unused = {
>> >>>          .reg_offset             = pl011_zte_offsets,
>> >>>          .access_32b             = true,
>> >>>          .ifls                   = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
>> >>> -       .get_fifosize           = get_fifosize_arm,
>> >>> +       .fr_busy                = ZX_UART01x_FR_BUSY,
>> >>> +       .fr_dsr                 = ZX_UART01x_FR_DSR,
>> >>> +       .fr_cts                 = ZX_UART01x_FR_CTS,
>> >>> +       .fr_ri                  = ZX_UART011_FR_RI,
>> >>> +       .oversampling           = false,
>> >>> +       .dma_threshold          = false,
>> >>> +       .cts_event_workaround   = false,
>> >>> +       .always_enabled         = false,
>> >>> +       .fixed_options          = false,
>> >>> +       .get_fifosize           = get_fifosize_zte,
>> >>>   };
>> >>>
>> >>>   /* Deals with DMA transactions */
>> >>> @@ -236,6 +266,10 @@ struct uart_amba_port {
>> >>>          unsigned int            im;             /* interrupt mask */
>> >>>          unsigned int            old_status;
>> >>>          unsigned int            fifosize;       /* vendor-specific */
>> >>> +       unsigned int            fr_busy;        /* vendor-specific */
>> >>> +       unsigned int            fr_dsr;         /* vendor-specific */
>> >>> +       unsigned int            fr_cts;         /* vendor-specific */
>> >>> +       unsigned int            fr_ri;          /* vendor-specific */
>> >>>          unsigned int            old_cr;         /* state during shutdown
>> >>> */
>> >>>          bool                    autorts;
>> >>>          unsigned int            fixed_baud;     /* vendor-set fixed baud
>> >>> rate */
>> >>> @@ -1166,7 +1200,7 @@ static void pl011_dma_shutdown(struct
>> >>> uart_amba_port *uap)
>> >>>                  return;
>> >>>
>> >>>          /* Disable RX and TX DMA */
>> >>> -       while (pl011_read(uap, REG_FR) & UART01x_FR_BUSY)
>> >>> +       while (pl011_read(uap, REG_FR) & uap->fr_busy)
>> >>>                  cpu_relax();
>> >>>
>> >>>          spin_lock_irq(&uap->port.lock);
>> >>> @@ -1415,11 +1449,11 @@ static void pl011_modem_status(struct
>> >>> uart_amba_port *uap)
>> >>>          if (delta & UART01x_FR_DCD)
>> >>>                  uart_handle_dcd_change(&uap->port, status &
>> >>> UART01x_FR_DCD);
>> >>>
>> >>> -       if (delta & UART01x_FR_DSR)
>> >>> +       if (delta & uap->fr_dsr)
>> >>>                  uap->port.icount.dsr++;
>> >>>
>> >>> -       if (delta & UART01x_FR_CTS)
>> >>> -               uart_handle_cts_change(&uap->port, status &
>> >>> UART01x_FR_CTS);
>> >>> +       if (delta & uap->fr_cts)
>> >>> +               uart_handle_cts_change(&uap->port, status & uap->fr_cts);
>> >>>
>> >>>          wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
>> >>>   }
>> >>> @@ -1492,7 +1526,7 @@ static unsigned int pl011_tx_empty(struct uart_port
>> >>> *port)
>> >>>          struct uart_amba_port *uap =
>> >>>              container_of(port, struct uart_amba_port, port);
>> >>>          unsigned int status = pl011_read(uap, REG_FR);
>> >>> -       return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 :
>> >>> TIOCSER_TEMT;
>> >>> +       return status & (uap->fr_busy | UART01x_FR_TXFF) ? 0 :
>> >>> TIOCSER_TEMT;
>> >>>   }
>> >>>
>> >>>   static unsigned int pl011_get_mctrl(struct uart_port *port)
>> >>> @@ -1507,9 +1541,9 @@ static unsigned int pl011_get_mctrl(struct
>> >>> uart_port *port)
>> >>>                  result |= tiocmbit
>> >>>
>> >>>          TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR);
>> >>> -       TIOCMBIT(UART01x_FR_DSR, TIOCM_DSR);
>> >>> -       TIOCMBIT(UART01x_FR_CTS, TIOCM_CTS);
>> >>> -       TIOCMBIT(UART011_FR_RI, TIOCM_RNG);
>> >>> +       TIOCMBIT(uap->fr_dsr, TIOCM_DSR);
>> >>> +       TIOCMBIT(uap->fr_cts, TIOCM_CTS);
>> >>> +       TIOCMBIT(uap->fr_ri, TIOCM_RNG);
>> >>>   #undef TIOCMBIT
>> >>>          return result;
>> >>>   }
>> >>> @@ -2086,7 +2120,7 @@ static int pl011_verify_port(struct uart_port
>> >>> *port, struct serial_struct *ser)
>> >>>          return ret;
>> >>>   }
>> >>>
>> >>> -static struct uart_ops amba_pl011_pops = {
>> >>> +static const struct uart_ops amba_pl011_pops = {
>> >>>          .tx_empty       = pl011_tx_empty,
>> >>>          .set_mctrl      = pl011_set_mctrl,
>> >>>          .get_mctrl      = pl011_get_mctrl,
>> >>> @@ -2190,7 +2224,7 @@ pl011_console_write(struct console *co, const char
>> >>> *s, unsigned int count)
>> >>>           *      Finally, wait for transmitter to become empty
>> >>>           *      and restore the TCR
>> >>>           */
>> >>> -       while (pl011_read(uap, REG_FR) & UART01x_FR_BUSY)
>> >>> +       while (pl011_read(uap, REG_FR) & uap->fr_busy)
>> >>>                  cpu_relax();
>> >>>          if (!uap->vendor->always_enabled)
>> >>>                  pl011_write(old_cr, uap, REG_CR);
>> >>> @@ -2472,8 +2506,12 @@ static int pl011_probe(struct amba_device *dev,
>> >>> const struct amba_id *id)
>> >>>                  return PTR_ERR(uap->clk);
>> >>>
>> >>>          uap->reg_offset = vendor->reg_offset;
>> >>> -       uap->vendor = vendor;
>> >>> -       uap->fifosize = vendor->get_fifosize(dev);
>> >>> +       uap->vendor     = vendor;
>> >>> +       uap->fifosize   = vendor->get_fifosize(dev);
>> >>> +       uap->fr_busy    = vendor->fr_busy;
>> >>> +       uap->fr_dsr     = vendor->fr_dsr;
>> >>> +       uap->fr_cts     = vendor->fr_cts;
>> >>> +       uap->fr_ri      = vendor->fr_ri;
>> >>>          uap->port.iotype = vendor->access_32b ? UPIO_MEM32 : UPIO_MEM;
>> >>>          uap->port.irq = dev->irq[0];
>> >>>          uap->port.ops = &amba_pl011_pops;
>> >>> @@ -2555,6 +2593,10 @@ static int sbsa_uart_probe(struct platform_device
>> >>> *pdev)
>> >>>          uap->reg_offset = vendor_sbsa.reg_offset;
>> >>>          uap->vendor     = &vendor_sbsa;
>> >>>          uap->fifosize   = 32;
>> >>> +       uap->fr_busy    = vendor_sbsa.fr_busy;
>> >>> +       uap->fr_dsr     = vendor_sbsa.fr_dsr;
>> >>> +       uap->fr_cts     = vendor_sbsa.fr_cts;
>> >>> +       uap->fr_ri      = vendor_sbsa.fr_ri;
>> >>>          uap->port.iotype = vendor_sbsa.access_32b ? UPIO_MEM32 :
>> >>> UPIO_MEM;
>> >>>          uap->port.irq   = platform_get_irq(pdev, 0);
>> >>>          uap->port.ops   = &sbsa_uart_pops;
>> >>> @@ -2615,6 +2657,11 @@ static struct amba_id pl011_ids[] = {
>> >>>                  .mask   = 0x00ffffff,
>> >>>                  .data   = &vendor_st,
>> >>>          },
>> >>> +       {
>> >>> +               .id     = 0xfefefe,
>> >>> +               .mask   = 0xffffff,
>> >>> +               .data   = &vendor_zte,
>> >>> +       },
>> >>>          { 0, 0 },
>> >>>   };
>> >>>
>> >>> diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
>> >>> index d76a19b..750f2ef 100644
>> >>> --- a/include/linux/amba/serial.h
>> >>> +++ b/include/linux/amba/serial.h
>> >>> @@ -103,6 +103,10 @@
>> >>>   #define UART01x_FR_DSR                 0x002
>> >>>   #define UART01x_FR_CTS                 0x001
>> >>>   #define UART01x_FR_TMSK                (UART01x_FR_TXFF +
>> >>> UART01x_FR_BUSY)
>> >>> +#define ZX_UART01x_FR_BUSY     0x300
>> >>> +#define ZX_UART01x_FR_DSR      0x008
>> >>> +#define ZX_UART01x_FR_CTS      0x002
>> >>> +#define ZX_UART011_FR_RI       0x001
>> >>>
>> >>>   #define UART011_CR_CTSEN       0x8000  /* CTS hardware flow control */
>> >>>   #define UART011_CR_RTSEN       0x4000  /* RTS hardware flow control */
>> >>> --
>> >>> 1.9.1
>> >>>
>> >
>> > Russell,
>> >
>> > Do you have any comments to these change?
>> >
>> > Jun
>>
>> Greg,
>>
>> Do you have any idea on how to drive review on this patch? Seems
>> maintainer Russell is too busy and missing for this thread and others
>> do not have comments. Your comments are appreciated!
>
> I would like to get Russell's opinion of this before merging it.
>
> thanks,
>
> greg k-h

Russell,

Could you help have a look at this patch? Thanks!

Jun
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