target/linux/ixp4xx/patches-4.1/160-delayed_uart_io.patch

   1 --- a/drivers/tty/serial/8250/8250_core.c
   2 +++ b/drivers/tty/serial/8250/8250_core.c
   3 @@ -438,6 +438,20 @@ static void mem_serial_out(struct uart_p
   4         writeb(value, p->membase + offset);
   5  }
   6
   7 +static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
   8 +{
   9 +       struct uart_8250_port *up = (struct uart_8250_port *)p;
  10 +       udelay(up->port.rw_delay);
  11 +       return mem_serial_in(p, offset);
  12 +}
  13 +
  14 +static void memdelay_serial_out(struct uart_port *p, int offset, int value)
  15 +{
  16 +       struct uart_8250_port *up = (struct uart_8250_port *)p;
  17 +       udelay(up->port.rw_delay);
  18 +       mem_serial_out(p, offset, value);
  19 +}
  20 +
  21  static void mem32_serial_out(struct uart_port *p, int offset, int value)
  22  {
  23         offset = offset << p->regshift;
  24 @@ -505,6 +519,11 @@ static void set_io_from_upio(struct uart
  25                 p->serial_out = mem32be_serial_out;
  26                 break;
  27
  28 +       case UPIO_MEM_DELAY:
  29 +               p->serial_in = memdelay_serial_in;
  30 +               p->serial_out = memdelay_serial_out;
  31 +               break;
  32 +
  33  #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
  34         case UPIO_AU:
  35                 p->serial_in = au_serial_in;
  36 @@ -531,6 +550,7 @@ serial_port_out_sync(struct uart_port *p
  37         case UPIO_MEM:
  38         case UPIO_MEM32:
  39         case UPIO_MEM32BE:
  40 +       case UPIO_MEM_DELAY:
  41         case UPIO_AU:
  42                 p->serial_out(p, offset, value);
  43                 p->serial_in(p, UART_LCR);      /* safe, no side-effects */
  44 @@ -2768,6 +2788,7 @@ static int serial8250_request_std_resour
  45         case UPIO_MEM32:
  46         case UPIO_MEM32BE:
  47         case UPIO_MEM:
  48 +       case UPIO_MEM_DELAY:
  49                 if (!port->mapbase)
  50                         break;
  51
  52 @@ -2805,6 +2826,7 @@ static void serial8250_release_std_resou
  53         case UPIO_MEM32:
  54         case UPIO_MEM32BE:
  55         case UPIO_MEM:
  56 +       case UPIO_MEM_DELAY:
  57                 if (!port->mapbase)
  58                         break;
  59
  60 @@ -3693,6 +3715,7 @@ static int serial8250_probe(struct platf
  61                 uart.port.set_termios   = p->set_termios;
  62                 uart.port.pm            = p->pm;
  63                 uart.port.dev           = &dev->dev;
  64 +               uart.port.rw_delay      = p->rw_delay;
  65                 uart.port.irqflags      |= irqflag;
  66                 ret = serial8250_register_8250_port(&uart);
  67                 if (ret < 0) {
  68 @@ -3849,6 +3872,7 @@ int serial8250_register_8250_port(struct
  69                 uart->bugs              = up->bugs;
  70                 uart->port.mapbase      = up->port.mapbase;
  71                 uart->port.mapsize      = up->port.mapsize;
  72 +               uart->port.rw_delay     = up->port.rw_delay;
  73                 uart->port.private_data = up->port.private_data;
  74                 uart->port.fifosize     = up->port.fifosize;
  75                 uart->tx_loadsz         = up->tx_loadsz;
  76 --- a/drivers/tty/serial/serial_core.c
  77 +++ b/drivers/tty/serial/serial_core.c
  78 @@ -2177,6 +2177,7 @@ uart_report_port(struct uart_driver *drv
  79                 snprintf(address, sizeof(address),
  80                          "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
  81                 break;
  82 +       case UPIO_MEM_DELAY:
  83         case UPIO_MEM:
  84         case UPIO_MEM32:
  85         case UPIO_MEM32BE:
  86 @@ -2824,6 +2825,7 @@ int uart_match_port(struct uart_port *po
  87         case UPIO_HUB6:
  88                 return (port1->iobase == port2->iobase) &&
  89                        (port1->hub6   == port2->hub6);
  90 +       case UPIO_MEM_DELAY:
  91         case UPIO_MEM:
  92         case UPIO_MEM32:
  93         case UPIO_MEM32BE:
  94 --- a/include/linux/serial_8250.h
  95 +++ b/include/linux/serial_8250.h
  96 @@ -27,6 +27,7 @@ struct plat_serial8250_port {
  97         void            *private_data;
  98         unsigned char   regshift;       /* register shift */
  99         unsigned char   iotype;         /* UPIO_* */
 100 +       unsigned int rw_delay;  /* udelay for slower busses IXP4XX Expansion Bus */
 101         unsigned char   hub6;
 102         upf_t           flags;          /* UPF_* flags */
 103         unsigned int    type;           /* If UPF_FIXED_TYPE */
 104 --- a/include/linux/serial_core.h
 105 +++ b/include/linux/serial_core.h
 106 @@ -150,6 +150,7 @@ struct uart_port {
 107  #define UPIO_AU                        (SERIAL_IO_AU)          /* Au1x00 and RT288x type IO */
 108  #define UPIO_TSI               (SERIAL_IO_TSI)         /* Tsi108/109 type IO */
 109  #define UPIO_MEM32BE           (SERIAL_IO_MEM32BE)     /* 32b big endian */
 110 +#define UPIO_MEM_DELAY         (SERIAL_IO_MEM_DELAY)
 111
 112         unsigned int            read_status_mask;       /* driver specific */
 113         unsigned int            ignore_status_mask;     /* driver specific */
 114 @@ -231,6 +232,7 @@ struct uart_port {
 115         int                     hw_stopped;             /* sw-assisted CTS flow state */
 116         unsigned int            mctrl;                  /* current modem ctrl settings */
 117         unsigned int            timeout;                /* character-based timeout */
 118 +       unsigned int            rw_delay;               /* udelay for slow busses, IXP4XX Expansion Bus */
 119         unsigned int            type;                   /* port type */
 120         const struct uart_ops   *ops;
 121         unsigned int            custom_divisor;
 122 --- a/include/uapi/linux/serial.h
 123 +++ b/include/uapi/linux/serial.h
 124 @@ -69,6 +69,7 @@ struct serial_struct {
 125  #define SERIAL_IO_AU     4
 126  #define SERIAL_IO_TSI    5
 127  #define SERIAL_IO_MEM32BE 6
 128 +#define SERIAL_IO_MEM_DELAY 7
 129
 130  #define UART_CLEAR_FIFO                0x01
 131  #define UART_USE_FIFO          0x02