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160-delayed_uart_io.patch

160-delayed_uart_io.patch 4.3 KB
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  1. --- a/drivers/tty/serial/8250/8250_core.c
    2. 

  2. +++ b/drivers/tty/serial/8250/8250_core.c
    3. 

  3. @@ -446,6 +446,20 @@ static void mem_serial_out(struct uart_p
    4. 

  4.  	writeb(value, p->membase + offset);
    5. 

  5.  }
    6. 

  6.  
    7. 

  7. +static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
    8. 

  8. +{
    9. 

  9. +	struct uart_8250_port *up = (struct uart_8250_port *)p;
    10. 

  10. +	udelay(up->port.rw_delay);
    11. 

  11. +	return mem_serial_in(p, offset);
    12. 

  12. +}
    13. 

  13. +
    14. 

  14. +static void memdelay_serial_out(struct uart_port *p, int offset, int value)
    15. 

  15. +{
    16. 

  16. +	struct uart_8250_port *up = (struct uart_8250_port *)p;
    17. 

  17. +	udelay(up->port.rw_delay);
    18. 

  18. +	mem_serial_out(p, offset, value);
    19. 

  19. +}
    20. 

  20. +
    21. 

  21.  static void mem32_serial_out(struct uart_port *p, int offset, int value)
    22. 

  22.  {
    23. 

  23.  	offset = offset << p->regshift;
    24. 

  24. @@ -513,6 +527,11 @@ static void set_io_from_upio(struct uart
    25. 

  25.  		p->serial_out = mem32be_serial_out;
    26. 

  26.  		break;
    27. 

  27.  
    28. 

  28. +	case UPIO_MEM_DELAY:
    29. 

  29. +		p->serial_in = memdelay_serial_in;
    30. 

  30. +		p->serial_out = memdelay_serial_out;
    31. 

  31. +		break;
    32. 

  32. +
    33. 

  33.  #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
    34. 

  34.  	case UPIO_AU:
    35. 

  35.  		p->serial_in = au_serial_in;
    36. 

  36. @@ -539,6 +558,7 @@ serial_port_out_sync(struct uart_port *p
    37. 

  37.  	case UPIO_MEM:
    38. 

  38.  	case UPIO_MEM32:
    39. 

  39.  	case UPIO_MEM32BE:
    40. 

  40. +	case UPIO_MEM_DELAY:
    41. 

  41.  	case UPIO_AU:
    42. 

  42.  		p->serial_out(p, offset, value);
    43. 

  43.  		p->serial_in(p, UART_LCR);	/* safe, no side-effects */
    44. 

  44. @@ -2776,6 +2796,7 @@ static int serial8250_request_std_resour
    45. 

  45.  	case UPIO_MEM32:
    46. 

  46.  	case UPIO_MEM32BE:
    47. 

  47.  	case UPIO_MEM:
    48. 

  48. +	case UPIO_MEM_DELAY:
    49. 

  49.  		if (!port->mapbase)
    50. 

  50.  			break;
    51. 

  51.  
    52. 

  52. @@ -2813,6 +2834,7 @@ static void serial8250_release_std_resou
    53. 

  53.  	case UPIO_MEM32:
    54. 

  54.  	case UPIO_MEM32BE:
    55. 

  55.  	case UPIO_MEM:
    56. 

  56. +	case UPIO_MEM_DELAY:
    57. 

  57.  		if (!port->mapbase)
    58. 

  58.  			break;
    59. 

  59.  
    60. 

  60. @@ -3701,6 +3723,7 @@ static int serial8250_probe(struct platf
    61. 

  61.  		uart.port.set_termios	= p->set_termios;
    62. 

  62.  		uart.port.pm		= p->pm;
    63. 

  63.  		uart.port.dev		= &dev->dev;
    64. 

  64. +		uart.port.rw_delay	= p->rw_delay;
    65. 

  65.  		uart.port.irqflags	|= irqflag;
    66. 

  66.  		ret = serial8250_register_8250_port(&uart);
    67. 

  67.  		if (ret < 0) {
    68. 

  68. @@ -3857,6 +3880,7 @@ int serial8250_register_8250_port(struct
    69. 

  69.  		uart->bugs		= up->bugs;
    70. 

  70.  		uart->port.mapbase      = up->port.mapbase;
    71. 

  71.  		uart->port.mapsize      = up->port.mapsize;
    72. 

  72. +		uart->port.rw_delay	= up->port.rw_delay;
    73. 

  73.  		uart->port.private_data = up->port.private_data;
    74. 

  74.  		uart->port.fifosize	= up->port.fifosize;
    75. 

  75.  		uart->tx_loadsz		= up->tx_loadsz;
    76. 

  76. --- a/drivers/tty/serial/serial_core.c
    77. 

  77. +++ b/drivers/tty/serial/serial_core.c
    78. 

  78. @@ -2177,6 +2177,7 @@ uart_report_port(struct uart_driver *drv
    79. 

  79.  		snprintf(address, sizeof(address),
    80. 

  80.  			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
    81. 

  81.  		break;
    82. 

  82. +	case UPIO_MEM_DELAY:
    83. 

  83.  	case UPIO_MEM:
    84. 

  84.  	case UPIO_MEM32:
    85. 

  85.  	case UPIO_MEM32BE:
    86. 

  86. @@ -2824,6 +2825,7 @@ int uart_match_port(struct uart_port *po
    87. 

  87.  	case UPIO_HUB6:
    88. 

  88.  		return (port1->iobase == port2->iobase) &&
    89. 

  89.  		       (port1->hub6   == port2->hub6);
    90. 

  90. +	case UPIO_MEM_DELAY:
    91. 

  91.  	case UPIO_MEM:
    92. 

  92.  	case UPIO_MEM32:
    93. 

  93.  	case UPIO_MEM32BE:
    94. 

  94. --- a/include/linux/serial_8250.h
    95. 

  95. +++ b/include/linux/serial_8250.h
    96. 

  96. @@ -27,6 +27,7 @@ struct plat_serial8250_port {
    97. 

  97.  	void            *private_data;
    98. 

  98.  	unsigned char	regshift;	/* register shift */
    99. 

  99.  	unsigned char	iotype;		/* UPIO_* */
    100. 

  100. +	unsigned int rw_delay;	/* udelay for slower busses IXP4XX Expansion Bus */
    101. 

  101.  	unsigned char	hub6;
    102. 

  102.  	upf_t		flags;		/* UPF_* flags */
    103. 

  103.  	unsigned int	type;		/* If UPF_FIXED_TYPE */
    104. 

  104. --- a/include/linux/serial_core.h
    105. 

  105. +++ b/include/linux/serial_core.h
    106. 

  106. @@ -150,6 +150,7 @@ struct uart_port {
    107. 

  107.  #define UPIO_AU			(SERIAL_IO_AU)		/* Au1x00 and RT288x type IO */
    108. 

  108.  #define UPIO_TSI		(SERIAL_IO_TSI)		/* Tsi108/109 type IO */
    109. 

  109.  #define UPIO_MEM32BE		(SERIAL_IO_MEM32BE)	/* 32b big endian */
    110. 

  110. +#define UPIO_MEM_DELAY		(SERIAL_IO_MEM_DELAY)
    111. 

  111.  
    112. 

  112.  	unsigned int		read_status_mask;	/* driver specific */
    113. 

  113.  	unsigned int		ignore_status_mask;	/* driver specific */
    114. 

  114. @@ -231,6 +232,7 @@ struct uart_port {
    115. 

  115.  	int			hw_stopped;		/* sw-assisted CTS flow state */
    116. 

  116.  	unsigned int		mctrl;			/* current modem ctrl settings */
    117. 

  117.  	unsigned int		timeout;		/* character-based timeout */
    118. 

  118. +	unsigned int		rw_delay;		/* udelay for slow busses, IXP4XX Expansion Bus */
    119. 

  119.  	unsigned int		type;			/* port type */
    120. 

  120.  	const struct uart_ops	*ops;
    121. 

  121.  	unsigned int		custom_divisor;
    122. 

  122. --- a/include/uapi/linux/serial.h
    123. 

  123. +++ b/include/uapi/linux/serial.h
    124. 

  124. @@ -69,6 +69,7 @@ struct serial_struct {
    125. 

  125.  #define SERIAL_IO_AU	  4
    126. 

  126.  #define SERIAL_IO_TSI	  5
    127. 

  127.  #define SERIAL_IO_MEM32BE 6
    128. 

  128. +#define SERIAL_IO_MEM_DELAY 7
    129. 

  129.  
    130. 

  130.  #define UART_CLEAR_FIFO		0x01
    131. 

  131.  #define UART_USE_FIFO		0x02
    132.