target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch

   1 Add a new UART I/O type for slow busses such as the ixp4xx expansion bus
   2 --- a/include/linux/serial_8250.h
   3 +++ b/include/linux/serial_8250.h
   4 @@ -27,6 +27,7 @@ struct plat_serial8250_port {
   5         void            *private_data;
   6         unsigned char   regshift;       /* register shift */
   7         unsigned char   iotype;         /* UPIO_* */
   8 +       unsigned int rw_delay;  /* udelay for slower busses IXP4XX Expansion Bus */
   9         unsigned char   hub6;
  10         upf_t           flags;          /* UPF_* flags */
  11         unsigned int    type;           /* If UPF_FIXED_TYPE */
  12 --- a/include/linux/serial_core.h
  13 +++ b/include/linux/serial_core.h
  14 @@ -324,6 +324,7 @@ struct uart_port {
  15  #define UPIO_AU                        (4)                     /* Au1x00 type IO */
  16  #define UPIO_TSI               (5)                     /* Tsi108/109 type IO */
  17  #define UPIO_RM9000            (6)                     /* RM9000 type IO */
  18 +#define UPIO_MEM_DELAY         (7)
  19
  20         unsigned int            read_status_mask;       /* driver specific */
  21         unsigned int            ignore_status_mask;     /* driver specific */
  22 @@ -368,6 +369,7 @@ struct uart_port {
  23
  24         unsigned int            mctrl;                  /* current modem ctrl settings */
  25         unsigned int            timeout;                /* character-based timeout */
  26 +       unsigned int            rw_delay;               /* udelay for slow busses, IXP4XX Expansion Bus */
  27         unsigned int            type;                   /* port type */
  28         const struct uart_ops   *ops;
  29         unsigned int            custom_divisor;
  30 --- a/drivers/tty/serial/8250/8250.c
  31 +++ b/drivers/tty/serial/8250/8250.c
  32 @@ -400,6 +400,20 @@ static void mem_serial_out(struct uart_p
  33         writeb(value, p->membase + offset);
  34  }
  35
  36 +static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
  37 +{
  38 +       struct uart_8250_port *up = (struct uart_8250_port *)p;
  39 +       udelay(up->port.rw_delay);
  40 +       return mem_serial_in(p, offset);
  41 +}
  42 +
  43 +static void memdelay_serial_out(struct uart_port *p, int offset, int value)
  44 +{
  45 +       struct uart_8250_port *up = (struct uart_8250_port *)p;
  46 +       udelay(up->port.rw_delay);
  47 +       mem_serial_out(p, offset, value);
  48 +}
  49 +
  50  static void mem32_serial_out(struct uart_port *p, int offset, int value)
  51  {
  52         offset = map_8250_out_reg(p, offset) << p->regshift;
  53 @@ -459,6 +473,11 @@ static void set_io_from_upio(struct uart
  54                 p->serial_out = mem32_serial_out;
  55                 break;
  56
  57 +       case UPIO_MEM_DELAY:
  58 +               p->serial_in = memdelay_serial_in;
  59 +               p->serial_out = memdelay_serial_out;
  60 +               break;
  61 +
  62         case UPIO_AU:
  63                 p->serial_in = au_serial_in;
  64                 p->serial_out = au_serial_out;
  65 @@ -481,6 +500,7 @@ serial_out_sync(struct uart_8250_port *u
  66         switch (p->iotype) {
  67         case UPIO_MEM:
  68         case UPIO_MEM32:
  69 +       case UPIO_MEM_DELAY:
  70         case UPIO_AU:
  71                 p->serial_out(p, offset, value);
  72                 p->serial_in(p, UART_LCR);      /* safe, no side-effects */
  73 @@ -2498,6 +2518,7 @@ static int serial8250_request_std_resour
  74         case UPIO_TSI:
  75         case UPIO_MEM32:
  76         case UPIO_MEM:
  77 +       case UPIO_MEM_DELAY:
  78                 if (!up->port.mapbase)
  79                         break;
  80
  81 @@ -2534,6 +2555,7 @@ static void serial8250_release_std_resou
  82         case UPIO_TSI:
  83         case UPIO_MEM32:
  84         case UPIO_MEM:
  85 +       case UPIO_MEM_DELAY:
  86                 if (!up->port.mapbase)
  87                         break;
  88
  89 @@ -3050,6 +3072,7 @@ static int __devinit serial8250_probe(st
  90                 port.set_termios        = p->set_termios;
  91                 port.pm                 = p->pm;
  92                 port.dev                = &dev->dev;
  93 +               port.rw_delay           = p->rw_delay;
  94                 port.irqflags           |= irqflag;
  95                 ret = serial8250_register_port(&port);
  96                 if (ret < 0) {
  97 @@ -3199,6 +3222,7 @@ int serial8250_register_port(struct uart
  98                 uart->port.iotype       = port->iotype;
  99                 uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
 100                 uart->port.mapbase      = port->mapbase;
 101 +               uart->port.rw_delay                     = port->rw_delay;
 102                 uart->port.private_data = port->private_data;
 103                 if (port->dev)
 104                         uart->port.dev = port->dev;
 105 --- a/drivers/tty/serial/serial_core.c
 106 +++ b/drivers/tty/serial/serial_core.c
 107 @@ -2021,6 +2021,7 @@ uart_report_port(struct uart_driver *drv
 108                 snprintf(address, sizeof(address),
 109                          "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
 110                 break;
 111 +       case UPIO_MEM_DELAY:
 112         case UPIO_MEM:
 113         case UPIO_MEM32:
 114         case UPIO_AU:
 115 @@ -2436,6 +2437,7 @@ int uart_match_port(struct uart_port *po
 116         case UPIO_HUB6:
 117                 return (port1->iobase == port2->iobase) &&
 118                        (port1->hub6   == port2->hub6);
 119 +       case UPIO_MEM_DELAY:
 120         case UPIO_MEM:
 121         case UPIO_MEM32:
 122         case UPIO_AU: