target/linux/ixp4xx/patches-4.9/160-delayed_uart_io.patch

   1 --- a/drivers/tty/serial/8250/8250_core.c
   2 +++ b/drivers/tty/serial/8250/8250_core.c
   3 @@ -833,6 +833,7 @@ static int serial8250_probe(struct platf
   4                 uart.port.get_mctrl     = p->get_mctrl;
   5                 uart.port.pm            = p->pm;
   6                 uart.port.dev           = &dev->dev;
   7 +               uart.port.rw_delay      = p->rw_delay;
   8                 uart.port.irqflags      |= irqflag;
   9                 ret = serial8250_register_8250_port(&uart);
  10                 if (ret < 0) {
  11 @@ -989,6 +990,7 @@ int serial8250_register_8250_port(struct
  12                 uart->bugs              = up->bugs;
  13                 uart->port.mapbase      = up->port.mapbase;
  14                 uart->port.mapsize      = up->port.mapsize;
  15 +               uart->port.rw_delay     = up->port.rw_delay;
  16                 uart->port.private_data = up->port.private_data;
  17                 uart->tx_loadsz         = up->tx_loadsz;
  18                 uart->capabilities      = up->capabilities;
  19 --- a/drivers/tty/serial/serial_core.c
  20 +++ b/drivers/tty/serial/serial_core.c
  21 @@ -2229,6 +2229,7 @@ uart_report_port(struct uart_driver *drv
  22                 snprintf(address, sizeof(address),
  23                          "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
  24                 break;
  25 +       case UPIO_MEM_DELAY:
  26         case UPIO_MEM:
  27         case UPIO_MEM16:
  28         case UPIO_MEM32:
  29 @@ -2893,6 +2894,7 @@ int uart_match_port(struct uart_port *po
  30         case UPIO_HUB6:
  31                 return (port1->iobase == port2->iobase) &&
  32                        (port1->hub6   == port2->hub6);
  33 +       case UPIO_MEM_DELAY:
  34         case UPIO_MEM:
  35         case UPIO_MEM16:
  36         case UPIO_MEM32:
  37 --- a/include/linux/serial_8250.h
  38 +++ b/include/linux/serial_8250.h
  39 @@ -28,6 +28,7 @@ struct plat_serial8250_port {
  40         void            *private_data;
  41         unsigned char   regshift;       /* register shift */
  42         unsigned char   iotype;         /* UPIO_* */
  43 +       unsigned int rw_delay;  /* udelay for slower busses IXP4XX Expansion Bus */
  44         unsigned char   hub6;
  45         upf_t           flags;          /* UPF_* flags */
  46         unsigned int    type;           /* If UPF_FIXED_TYPE */
  47 --- a/include/linux/serial_core.h
  48 +++ b/include/linux/serial_core.h
  49 @@ -152,6 +152,7 @@ struct uart_port {
  50  #define UPIO_TSI               (SERIAL_IO_TSI)         /* Tsi108/109 type IO */
  51  #define UPIO_MEM32BE           (SERIAL_IO_MEM32BE)     /* 32b big endian */
  52  #define UPIO_MEM16             (SERIAL_IO_MEM16)       /* 16b little endian */
  53 +#define UPIO_MEM_DELAY         (SERIAL_IO_MEM_DELAY)
  54
  55         unsigned int            read_status_mask;       /* driver specific */
  56         unsigned int            ignore_status_mask;     /* driver specific */
  57 @@ -233,6 +234,7 @@ struct uart_port {
  58         int                     hw_stopped;             /* sw-assisted CTS flow state */
  59         unsigned int            mctrl;                  /* current modem ctrl settings */
  60         unsigned int            timeout;                /* character-based timeout */
  61 +       unsigned int            rw_delay;               /* udelay for slow busses, IXP4XX Expansion Bus */
  62         unsigned int            type;                   /* port type */
  63         const struct uart_ops   *ops;
  64         unsigned int            custom_divisor;
  65 --- a/drivers/tty/serial/8250/8250_port.c
  66 +++ b/drivers/tty/serial/8250/8250_port.c
  67 @@ -384,6 +384,20 @@ static unsigned int mem16_serial_in(stru
  68         return readw(p->membase + offset);
  69  }
  70
  71 +static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
  72 +{
  73 +       struct uart_8250_port *up = (struct uart_8250_port *)p;
  74 +       udelay(up->port.rw_delay);
  75 +       return mem_serial_in(p, offset);
  76 +}
  77 +
  78 +static void memdelay_serial_out(struct uart_port *p, int offset, int value)
  79 +{
  80 +       struct uart_8250_port *up = (struct uart_8250_port *)p;
  81 +       udelay(up->port.rw_delay);
  82 +       mem_serial_out(p, offset, value);
  83 +}
  84 +
  85  static void mem32_serial_out(struct uart_port *p, int offset, int value)
  86  {
  87         offset = offset << p->regshift;
  88 @@ -456,6 +470,11 @@ static void set_io_from_upio(struct uart
  89                 p->serial_out = mem32be_serial_out;
  90                 break;
  91
  92 +       case UPIO_MEM_DELAY:
  93 +               p->serial_in = memdelay_serial_in;
  94 +               p->serial_out = memdelay_serial_out;
  95 +               break;
  96 +
  97  #ifdef CONFIG_SERIAL_8250_RT288X
  98         case UPIO_AU:
  99                 p->serial_in = au_serial_in;
 100 @@ -483,6 +502,7 @@ serial_port_out_sync(struct uart_port *p
 101         case UPIO_MEM16:
 102         case UPIO_MEM32:
 103         case UPIO_MEM32BE:
 104 +       case UPIO_MEM_DELAY:
 105         case UPIO_AU:
 106                 p->serial_out(p, offset, value);
 107                 p->serial_in(p, UART_LCR);      /* safe, no side-effects */
 108 @@ -2759,6 +2779,7 @@ static int serial8250_request_std_resour
 109         case UPIO_MEM32BE:
 110         case UPIO_MEM16:
 111         case UPIO_MEM:
 112 +       case UPIO_MEM_DELAY:
 113                 if (!port->mapbase)
 114                         break;
 115
 116 @@ -2797,6 +2818,7 @@ static void serial8250_release_std_resou
 117         case UPIO_MEM32BE:
 118         case UPIO_MEM16:
 119         case UPIO_MEM:
 120 +       case UPIO_MEM_DELAY:
 121                 if (!port->mapbase)
 122                         break;
 123
 124 --- a/include/uapi/linux/serial.h
 125 +++ b/include/uapi/linux/serial.h
 126 @@ -70,6 +70,7 @@ struct serial_struct {
 127  #define SERIAL_IO_TSI    5
 128  #define SERIAL_IO_MEM32BE 6
 129  #define SERIAL_IO_MEM16        7
 130 +#define SERIAL_IO_MEM_DELAY 10
 131
 132  #define UART_CLEAR_FIFO                0x01
 133  #define UART_USE_FIFO          0x02