[LinuxBIOS] r2409 - trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a

[Stefan Reinauer]

* svn at openbios.org <svn at openbios.org> [060913 21:29]:
> Modified:
>    trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/cmos.layout
>    trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/mainboard.c
> Log:
> Add DCON support.
 
Dumb question: should this not go into the LinuxBIOS table rather then
CMOS. From a quick view communication channels are

  CMOS     --> LinuxBIOS (talk to lb)
  LBTABLE  <-- LinuxBIOS (listen to lb)

 
> Modified: trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/cmos.layout
> ===================================================================
> --- trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/cmos.layout	2006-09-13 07:55:23 UTC (rev 2408)
> +++ trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/cmos.layout	2006-09-13 19:29:31 UTC (rev 2409)
> @@ -36,6 +36,7 @@
>  424          4       e       7        boot_third
>  428          4       h       0        boot_index
>  432	     8       h       0        boot_countdown
> +440	     1	     e	     0	      dcon_present
>  1008         16      h       0        check_sum
>  
>  enumerations
> 
> Modified: trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/mainboard.c
> ===================================================================
> --- trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/mainboard.c	2006-09-13 07:55:23 UTC (rev 2408)
> +++ trunk/LinuxBIOSv2/src/mainboard/olpc/rev_a/mainboard.c	2006-09-13 19:29:31 UTC (rev 2409)
> @@ -4,10 +4,70 @@
>  #include <device/pci_ids.h>
>  #include <device/pci_ops.h>
>  #include <arch/io.h>
> +#include <pc80/mc146818rtc.h>
>  #include "chip.h"
> +#include "../southbridge/amd/cs5536/cs5536_smbus2.h"
>  
> +/* Borrowed from mc146818rtc.c */
>  
> +#define CMOS_READ(addr) ({ \
> +		outb((addr),RTC_PORT(0)); \
> +		inb(RTC_PORT(1)); \
> +		})
>  
> +#define CMOS_WRITE(val, addr) ({ \
> +		outb((addr),RTC_PORT(0)); \
> +		outb((val),RTC_PORT(1)); \
> +		})
> +
> +static void write_bit(unsigned char val) {
> +
> +	unsigned char byte = CMOS_READ(440 / 8);
> +
> +	/* Don't change it if its already set */
> +
> +	if ((byte & 1) == (val & 1))
> +		return;
> +
> +	byte &= ~1;
> +	byte |= val & 1;
> +	CMOS_WRITE(val, 440/8);
> +}
> +
> +static unsigned short _getsmbusbase(void) {
> +	unsigned devfn = PCI_DEVFN(0xf, 0);
> +	device_t dev = dev_find_slot(0x0, devfn);
> +	unsigned long addr = pci_read_config32(dev, PCI_BASE_ADDRESS_0);
> +
> +	return (unsigned short) (addr & ~1);
> +}
> +
> +static void init_dcon(void) {
> +
> +  int ret = 1;
> +  unsigned short rev = 0;
> +  unsigned short iobase = _getsmbusbase();
> +
> +  printk_debug("CHECKING FOR DCON (%x)\n", iobase);
> +
> +  /* Get the IO base for the SMBUS */
> +
> +  rev = do_smbus_read_word(iobase, 0x0D << 1, 0x00);
> +
> +  if (rev & 0xDC00) {
> +	printk_debug("DCON FOUND - REV %x\n", rev);
> +
> +	/* Enable the DCON */
> +	ret = do_smbus_write_word(iobase, 0x0D << 1, 0x01, 0x0069);
> +	if (ret != 0)
> +		printk_debug("DCON ENABLE FAILED\n", ret);
> +  }
> +  else
> +	  printk_debug("DCON NOT FOUND (%x)\n", rev);
> +
> +  write_bit(rev > 0 ? 1 : 0);
> +}
> +
>  static void init(struct device *dev) {
>  /*
>  	unsigned bus = 0;
> @@ -32,6 +92,8 @@
>  		pci_write_config8(usb, PCI_INTERRUPT_LINE, usbirq);
>  	}
>  #endif
> +
> +	init_dcon();
>  	printk_debug("OLPC REVA EXIT %s\n", __FUNCTION__);
>  }
>  
> 
> 
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> 

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