CC'ing the original author.
On Thu, 7 Jul 2011, Jan Beulich wrote:
> >>> On 07.07.11 at 15:59, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> >>> wrote:
> > # HG changeset patch
> > # User James Mckenzie <jamesmck@xxxxxxxxxxxxxxxxxxxx>
> > # Date 1310047149 14400
> > # Node ID 7cdc5770d13bbd7fc2b958ba7d74787ff4e20eef
> > # Parent 2f63562df1c4230492a81793dce3672f93c93d9a
> > xen: Automatically find serial port on PCI/PCIe and AMT devices.
> >
> > Instead of having to manually look the right I/O port on the PCI
> > devices or AMT devices, lets probe the card and find that
> > automatically.
> >
> > This means that you don't have to have this:
> > com1=115200,8n1,0xd800,0
> >
> > But instead can have
> > com1=115200,8n1,magic
> >
> > Or if you have AMT:
> > com1=19200,8n1,amt
> >
> > Signed-off-by: James Mckenzie <jamesmck@xxxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > Signed-off-by: Tom Goetz <tom.goetz@xxxxxxxxxxxxxxxxxxx>
> >
> > diff -r 2f63562df1c4 -r 7cdc5770d13b xen/drivers/char/ns16550.c
> > --- a/xen/drivers/char/ns16550.c Mon Jun 27 17:37:12 2011 +0100
> > +++ b/xen/drivers/char/ns16550.c Thu Jul 07 09:59:09 2011 -0400
> > @@ -17,6 +17,8 @@
> > #include <xen/timer.h>
> > #include <xen/serial.h>
> > #include <xen/iocap.h>
> > +#include <xen/pci.h>
> > +#include <xen/pci_regs.h>
> > #include <asm/io.h>
> >
> > /*
> > @@ -433,6 +435,64 @@ static int __init check_existence(struct
> > return (status == 0x90);
> > }
> >
> > +static int
> > +magic_uart_config (struct ns16550 *uart,int skip_amt)
> > +{
> > + uint16_t class;
> > + uint32_t bar0, len;
> > + int b, d, f;
> > +
> > +/*Skanky hack - start at bus 1 to avoid AMT, a plug in card cannot be on
> > bus
> > 1 */
> > +
> > + if (skip_amt) b=1;
> > + else b=0;
> > +
> > + for (; b < 0x100; ++b)
> > + {
> > + for (d = 0; d < 0x20; ++d)
> > + {
> > + for (f = 0; f < 0x8; ++f)
> > + {
> > +
> > + class = pci_conf_read16 (b, d, f, PCI_CLASS_DEVICE);
> > + if (class != 0x700)
> > + continue;;
> > +
> > + bar0 = pci_conf_read32 (b, d, f, PCI_BASE_ADDRESS_0);
>
> Why would a serial port only be allowed to be on the port specified
> with BAR0? E.g. if you have a serial card with multiple ports, multiple
> BARs could be candidates.
>
> Also, why would the first one found be it?
>
> Jan
>
> > +
> > + /* Not IO */
> > + if (!(bar0 & 1))
> > + continue;
> > +
> > + pci_conf_write32 (b, d, f, PCI_BASE_ADDRESS_0, 0xffffffff);
> > + len = pci_conf_read32 (b, d, f, PCI_BASE_ADDRESS_0);
> > + pci_conf_write32 (b, d, f, PCI_BASE_ADDRESS_0, bar0);
> > +
> > + /* Not 8 bytes */
> > + if ((len & 0xffff) != 0xfff9)
> > + continue;
> > +
> > + uart->io_base = bar0 & 0xfffe;
> > + uart->irq = 0;
>
> Hmm, I found that without use of an interrupt the output isn't very
> reliable. But yes, getting the proper number could be pretty difficult,
> especially this early.
>
> Jan
>
> > +
> > + return 0;
> > +
> > + }
> > +
> > + }
> > + }
> > +
> > + if (!skip_amt)
> > + return -1;
> > +
> > + uart->io_base = 0x3f8;
> > + uart->irq = 0;
> > + uart->clock_hz = UART_CLOCK_HZ;
> > +
> > + return 0;
> > +}
> > +
> > +
> > #define PARSE_ERR(_f, _a...) \
> > do { \
> > printk( "ERROR: " _f "\n" , ## _a ); \
> > @@ -481,7 +541,18 @@ static void __init ns16550_parse_port_co
> > if ( *conf == ',' )
> > {
> > conf++;
> > - uart->io_base = simple_strtoul(conf, &conf, 0);
> > +
> > + if ( strncmp(conf,"magic",5) == 0 ) {
> > + if (magic_uart_config(uart,1))
> > + return;
> > + conf+=5;
> > + } else if ( strncmp(conf,"amt",3) == 0 ) {
> > + if (magic_uart_config(uart,0))
> > + return;
> > + conf+=3;
> > + } else {
> > + uart->io_base = simple_strtoul(conf, &conf, 0);
> > + }
> >
> > if ( *conf == ',' )
> > {
>
>
>
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