On Mon, Jun 06, 2016 at 06:27:40PM +0200, Andrew Jones wrote:
> On Mon, Jun 06, 2016 at 02:46:38PM +0200, Alexander Gordeev wrote:
> > + for (i = 0; i < nr_addr_spaces; i++) {
> > + /*
> > + * The PCI binding claims the numerical representation of a PCI
> > + * address consists of three cells, encoded as follows:
>
> nit: No need to say 'claims', "The PCI binding encodes the PCI address
> with three cells as follows:"
>
> > + *
> > + * phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
> > + * phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
> > + * phys.lo cell: llllllll llllllll llllllll llllllll
> > + *
> > + * PCI device bus address and flags are encoded into phys.high
> > + * PCI 64 bit address is encoded into phys.mid and phys.low
> > + */
> > + as->type = of_flags_to_pci_type(fdt32_to_cpu(data[0]));
> > + as->pci_start = ((u64)fdt32_to_cpu(data[1]) << 32) |
> > + fdt32_to_cpu(data[2]);
> > +
> > + if (nr_range_cells == 6) {
> > + as->start = fdt32_to_cpu(data[3]);
> > + as->size = ((u64)fdt32_to_cpu(data[4]) << 32) |
> > + fdt32_to_cpu(data[5]);
> > + } else {
> > + as->start = ((u64)fdt32_to_cpu(data[3]) << 32) |
> > + fdt32_to_cpu(data[4]);
> > + as->size = ((u64)fdt32_to_cpu(data[5]) << 32) |
> > + fdt32_to_cpu(data[6]);
> > + }
> > +
> > + data += nr_range_cells;
> > + as++;
(2)
> > + }
> > +
> > + return host;
> > +}
> > +
> > +static u64 pci_alloc_resource(u32 bar, u64 size)
> > +{
> > + struct pci_host_bridge *host = pci_host_bridge;
> > + struct pci_addr_space *as = &host->addr_space[0];
> > + phys_addr_t addr;
> > + u32 mask;
> > + int i;
> > +
> > + for (i = 0; i < host->nr_addr_spaces; i++) {
> > + if (as->type == pci_bar_type(bar))
> > + break;
> > + as++;
>
> nit: could have put this as++ up with the i++ like you do below
Actually, I forgot to make it below (1) the same way as here :-)
The reason is there are three cycles looping over address spaces
and I wanted to make them alike. I chose (2) as the sample since
these two assignents read better:
data += nr_range_cells;
as++;
Will repost whatever you like, IOW ;)
> > + }
> > + if (i >= host->nr_addr_spaces) {
> > + printf("No PCI resource found for a device\n");
> > + assert(0);
> > + }
> > +
> > + mask = pci_bar_mask(bar);
> > + size = ALIGN(size, ~mask + 1);
> > + assert(as->allocated + size <= as->size);
> > +
> > + addr = as->pci_start + as->allocated;
> > + as->allocated += size;
> > +
> > + return addr;
> > +}
> > +
> > +bool pci_probe(void)
> > +{
> > + pcidevaddr_t dev;
> > + u8 header;
> > + u32 cmd;
> > + int i;
> > +
> > + assert(!pci_host_bridge);
> > + pci_host_bridge = pci_dt_probe();
> > + if (!pci_host_bridge)
> > + return false;
> > +
> > + for (dev = 0; dev < 256; dev++) {
> > + if (!pci_dev_exists(dev))
> > + continue;
> > +
> > + /* We are only interested in normal PCI devices */
> > + header = pci_config_readb(dev, PCI_HEADER_TYPE);
> > + if ((header & PCI_HEADER_TYPE_MASK) != PCI_HEADER_TYPE_NORMAL)
> > + continue;
> > +
> > + cmd = PCI_COMMAND_SERR;
> > +
> > + for (i = 0; i < 6; i++) {
> > + u64 addr, size;
> > + u32 bar;
> > +
> > + size = pci_bar_size(dev, i);
> > + if (!size)
> > + break;
> > +
> > + bar = pci_bar_get(dev, i);
> > + addr = pci_alloc_resource(bar, size);
> > + pci_bar_set_addr(dev, i, addr);
> > +
> > + if (pci_bar_is_memory(dev, i))
> > + cmd |= PCI_COMMAND_MEMORY;
> > + else
> > + cmd |= PCI_COMMAND_IO;
> > +
> > + if (pci_bar_is64(dev, i))
> > + i++;
> > + }
> > +
> > + pci_config_writel(dev, PCI_COMMAND, cmd);
> > + }
> > +
> > + return true;
> > +}
> > +
> > +/*
> > + * This function is to be called from pci_translate_addr() to provide
> > + * mapping between this host bridge's PCI busses address and CPU physical
> > + * address.
> > + */
> > +phys_addr_t pci_host_bridge_get_paddr(u64 pci_addr)
> > +{
> > + struct pci_host_bridge *host = pci_host_bridge;
> > + struct pci_addr_space *as = &host->addr_space[0];
> > + int i;
> > +
> > + for (i = 0; i < host->nr_addr_spaces; i++, as++) {
(1)
> > + if (pci_addr >= as->pci_start &&
> > + pci_addr < as->pci_start + as->size)
> > + return as->start + (pci_addr - as->pci_start);
> > + }
> > +
> > + return 0;
> > +}
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