target/linux/ramips/patches-2.6.30/101-rt288x_serial_driver_hack.patch

   1 --- a/drivers/serial/8250.c
   2 +++ b/drivers/serial/8250.c
   3 @@ -289,9 +289,9 @@ static const struct serial8250_config ua
   4         },
   5  };
   6
   7 -#if defined (CONFIG_SERIAL_8250_AU1X00)
   8 +#if defined (CONFIG_SERIAL_8250_AU1X00) || defined (CONFIG_SERIAL_8250_RT288X)
   9
  10 -/* Au1x00 UART hardware has a weird register layout */
  11 +/* Au1x00 and RT288x UART hardware has a weird register layout */
  12  static const u8 au_io_in_map[] = {
  13         [UART_RX]  = 0,
  14         [UART_IER] = 2,
  15 @@ -409,7 +409,7 @@ static unsigned int mem32_serial_in(stru
  16         return readl(p->membase + offset);
  17  }
  18
  19 -#ifdef CONFIG_SERIAL_8250_AU1X00
  20 +#if defined(CONFIG_SERIAL_8250_AU1X00) || defined(CONFIG_SERIAL_8250_RT288X)
  21  static unsigned int au_serial_in(struct uart_port *p, int offset)
  22  {
  23         offset = map_8250_in_reg(p, offset) << p->regshift;
  24 @@ -490,7 +490,7 @@ static void set_io_from_upio(struct uart
  25                 p->serial_out = mem32_serial_out;
  26                 break;
  27
  28 -#ifdef CONFIG_SERIAL_8250_AU1X00
  29 +#if defined (CONFIG_SERIAL_8250_AU1X00) || defined (CONFIG_SERIAL_8250_RT288X)
  30         case UPIO_AU:
  31                 p->serial_in = au_serial_in;
  32                 p->serial_out = au_serial_out;
  33 @@ -522,7 +522,7 @@ serial_out_sync(struct uart_8250_port *u
  34         switch (p->iotype) {
  35         case UPIO_MEM:
  36         case UPIO_MEM32:
  37 -#ifdef CONFIG_SERIAL_8250_AU1X00
  38 +#if defined (CONFIG_SERIAL_8250_AU1X00) || defined (CONFIG_SERIAL_8250_RT288X)
  39         case UPIO_AU:
  40  #endif
  41         case UPIO_DWAPB:
  42 @@ -560,8 +560,8 @@ static inline void _serial_dl_write(stru
  43         serial_outp(up, UART_DLM, value >> 8 & 0xff);
  44  }
  45
  46 -#if defined(CONFIG_SERIAL_8250_AU1X00)
  47 -/* Au1x00 haven't got a standard divisor latch */
  48 +#if defined (CONFIG_SERIAL_8250_AU1X00) || defined (CONFIG_SERIAL_8250_RT288X)
  49 +/* Au1x00 and RT288x haven't got a standard divisor latch */
  50  static int serial_dl_read(struct uart_8250_port *up)
  51  {
  52         if (up->port.iotype == UPIO_AU)
  53 @@ -768,22 +768,19 @@ static int size_fifo(struct uart_8250_po
  54   */
  55  static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
  56  {
  57 -       unsigned char old_dll, old_dlm, old_lcr;
  58 +       unsigned char old_lcr;
  59 +       unsigned int old_dl;
  60         unsigned int id;
  61
  62         old_lcr = serial_inp(p, UART_LCR);
  63         serial_outp(p, UART_LCR, UART_LCR_DLAB);
  64
  65 -       old_dll = serial_inp(p, UART_DLL);
  66 -       old_dlm = serial_inp(p, UART_DLM);
  67 +       old_dl = serial_dl_read(p);
  68
  69 -       serial_outp(p, UART_DLL, 0);
  70 -       serial_outp(p, UART_DLM, 0);
  71 +       serial_dl_write(p, 0);
  72 +       id = serial_dl_read(p);
  73
  74 -       id = serial_inp(p, UART_DLL) | serial_inp(p, UART_DLM) << 8;
  75 -
  76 -       serial_outp(p, UART_DLL, old_dll);
  77 -       serial_outp(p, UART_DLM, old_dlm);
  78 +       serial_dl_write(p, old_dl);
  79         serial_outp(p, UART_LCR, old_lcr);
  80
  81         return id;
  82 @@ -1205,7 +1202,7 @@ static void autoconfig(struct uart_8250_
  83         }
  84  #endif
  85
  86 -#ifdef CONFIG_SERIAL_8250_AU1X00
  87 +#if defined (CONFIG_SERIAL_8250_AU1X00) || defined (CONFIG_SERIAL_8250_RT288X)
  88         /* if access method is AU, it is a 16550 with a quirk */
  89         if (up->port.type == PORT_16550A && up->port.iotype == UPIO_AU)
  90                 up->bugs |= UART_BUG_NOMSR;
  91 --- a/drivers/serial/Kconfig
  92 +++ b/drivers/serial/Kconfig
  93 @@ -266,6 +266,14 @@ config SERIAL_8250_AU1X00
  94           say Y to this option. The driver can handle up to 4 serial ports,
  95           depending on the SOC. If unsure, say N.
  96
  97 +config SERIAL_8250_RT288X
  98 +       bool "Ralink RT288x/RT305x serial port support"
  99 +       depends on SERIAL_8250 != n && (SOC_RT288X || SOC_RT305X)
 100 +       help
 101 +         If you have a Ralink RT288x/RT305x SoC based board and want to use the
 102 +         serial port, say Y to this option. The driver can handle up to 2 serial
 103 +         ports. If unsure, say N.
 104 +
 105  config SERIAL_8250_RM9K
 106         bool "Support for MIPS RM9xxx integrated serial port"
 107         depends on SERIAL_8250 != n && SERIAL_RM9000
 108 --- a/include/linux/serial_core.h
 109 +++ b/include/linux/serial_core.h
 110 @@ -269,7 +269,7 @@ struct uart_port {
 111  #define UPIO_HUB6              (1)
 112  #define UPIO_MEM               (2)
 113  #define UPIO_MEM32             (3)
 114 -#define UPIO_AU                        (4)                     /* Au1x00 type IO */
 115 +#define UPIO_AU                        (4)                     /* Au1x00 and RT288x type IO */
 116  #define UPIO_TSI               (5)                     /* Tsi108/109 type IO */
 117  #define UPIO_DWAPB             (6)                     /* DesignWare APB UART */
 118  #define UPIO_RM9000            (7)                     /* RM9000 type IO */