target/linux/ramips/patches-3.2/101-rt288x_serial_driver_hack.patch

   1 --- a/drivers/tty/serial/8250.c
   2 +++ b/drivers/tty/serial/8250.c
   3 @@ -318,9 +318,9 @@ static const struct serial8250_config ua
   4         },
   5  };
   6
   7 -#if defined(CONFIG_MIPS_ALCHEMY)
   8 +#if defined(CONFIG_MIPS_ALCHEMY) || 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 @@ -542,8 +542,8 @@ static inline void _serial_dl_write(stru
  16         serial_outp(up, UART_DLM, value >> 8 & 0xff);
  17  }
  18
  19 -#if defined(CONFIG_MIPS_ALCHEMY)
  20 -/* Au1x00 haven't got a standard divisor latch */
  21 +#if defined(CONFIG_MIPS_ALCHEMY) || defined (CONFIG_SERIAL_8250_RT288X)
  22 +/* Au1x00 and RT288x haven't got a standard divisor latch */
  23  static int serial_dl_read(struct uart_8250_port *up)
  24  {
  25         if (up->port.iotype == UPIO_AU)
  26 @@ -750,22 +750,19 @@ static int size_fifo(struct uart_8250_po
  27   */
  28  static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
  29  {
  30 -       unsigned char old_dll, old_dlm, old_lcr;
  31 +       unsigned char old_lcr;
  32 +       unsigned int old_dl;
  33         unsigned int id;
  34
  35         old_lcr = serial_inp(p, UART_LCR);
  36         serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_A);
  37
  38 -       old_dll = serial_inp(p, UART_DLL);
  39 -       old_dlm = serial_inp(p, UART_DLM);
  40 +       old_dl = serial_dl_read(p);
  41
  42 -       serial_outp(p, UART_DLL, 0);
  43 -       serial_outp(p, UART_DLM, 0);
  44 +       serial_dl_write(p, 0);
  45 +       id = serial_dl_read(p);
  46
  47 -       id = serial_inp(p, UART_DLL) | serial_inp(p, UART_DLM) << 8;
  48 -
  49 -       serial_outp(p, UART_DLL, old_dll);
  50 -       serial_outp(p, UART_DLM, old_dlm);
  51 +       serial_dl_write(p, old_dl);
  52         serial_outp(p, UART_LCR, old_lcr);
  53
  54         return id;
  55 @@ -891,7 +888,7 @@ static int broken_efr(struct uart_8250_p
  56         /*
  57          * Exar ST16C2550 "A2" devices incorrectly detect as
  58          * having an EFR, and report an ID of 0x0201.  See
  59 -        * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
  60 +        * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
  61          */
  62         if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16)
  63                 return 1;
  64 --- a/drivers/tty/serial/Kconfig
  65 +++ b/drivers/tty/serial/Kconfig
  66 @@ -258,6 +258,14 @@ config SERIAL_8250_ACORN
  67           system, say Y to this option.  The driver can handle 1, 2, or 3 port
  68           cards.  If unsure, say N.
  69
  70 +config SERIAL_8250_RT288X
  71 +       bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
  72 +       depends on SERIAL_8250 != n && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
  73 +       help
  74 +         If you have a Ralink RT288x/RT305x SoC based board and want to use the
  75 +         serial port, say Y to this option. The driver can handle up to 2 serial
  76 +         ports. If unsure, say N.
  77 +
  78  config SERIAL_8250_RM9K
  79         bool "Support for MIPS RM9xxx integrated serial port"
  80         depends on SERIAL_8250 != n && SERIAL_RM9000
  81 --- a/include/linux/serial_core.h
  82 +++ b/include/linux/serial_core.h
  83 @@ -317,7 +317,7 @@ struct uart_port {
  84  #define UPIO_HUB6              (1)
  85  #define UPIO_MEM               (2)
  86  #define UPIO_MEM32             (3)
  87 -#define UPIO_AU                        (4)                     /* Au1x00 type IO */
  88 +#define UPIO_AU                        (4)                     /* Au1x00 and RT288x type IO */
  89  #define UPIO_TSI               (5)                     /* Tsi108/109 type IO */
  90  #define UPIO_RM9000            (6)                     /* RM9000 type IO */
  91