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PCI update for v3.18:

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NVIDIA Tegra
     - Use physical range for I/O mapping (Thierry Reding)
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Merge tag 'pci-v3.18-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI fix from Bjorn Helgaas:
 "This fixes a Tegra20 regression that we introduced during the v3.18
  merge window"

* tag 'pci-v3.18-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: tegra: Use physical range for I/O mapping
This commit is contained in:
Linus Torvalds 2014-12-03 14:24:10 -08:00
commit 5dc626358f
1 changed files with 20 additions and 8 deletions
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28
drivers/pci/host/pci-tegra.c
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@ -276,6 +276,7 @@ struct tegra_pcie {
struct resource all; struct resource all;
struct resource io; struct resource io;
struct resource pio;
struct resource mem; struct resource mem;
struct resource prefetch; struct resource prefetch;
struct resource busn; struct resource busn;
@ -658,7 +659,6 @@ static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
{ {
struct tegra_pcie *pcie = sys_to_pcie(sys); struct tegra_pcie *pcie = sys_to_pcie(sys);
int err; int err;
phys_addr_t io_start;
err = devm_request_resource(pcie->dev, &pcie->all, &pcie->mem); err = devm_request_resource(pcie->dev, &pcie->all, &pcie->mem);
if (err < 0) if (err < 0)
@ -668,14 +668,12 @@ static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
if (err) if (err)
return err; return err;
io_start = pci_pio_to_address(pcie->io.start);
pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset); pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
pci_add_resource_offset(&sys->resources, &pcie->prefetch, pci_add_resource_offset(&sys->resources, &pcie->prefetch,
sys->mem_offset); sys->mem_offset);
pci_add_resource(&sys->resources, &pcie->busn); pci_add_resource(&sys->resources, &pcie->busn);
pci_ioremap_io(nr * SZ_64K, io_start); pci_ioremap_io(pcie->pio.start, pcie->io.start);
return 1; return 1;
} }
@ -786,7 +784,6 @@ static irqreturn_t tegra_pcie_isr(int irq, void *arg)
static void tegra_pcie_setup_translations(struct tegra_pcie *pcie) static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
{ {
u32 fpci_bar, size, axi_address; u32 fpci_bar, size, axi_address;
phys_addr_t io_start = pci_pio_to_address(pcie->io.start);
/* Bar 0: type 1 extended configuration space */ /* Bar 0: type 1 extended configuration space */
fpci_bar = 0xfe100000; fpci_bar = 0xfe100000;
@ -799,7 +796,7 @@ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
/* Bar 1: downstream IO bar */ /* Bar 1: downstream IO bar */
fpci_bar = 0xfdfc0000; fpci_bar = 0xfdfc0000;
size = resource_size(&pcie->io); size = resource_size(&pcie->io);
axi_address = io_start; axi_address = pcie->io.start;
afi_writel(pcie, axi_address, AFI_AXI_BAR1_START); afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ); afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1); afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
@ -1690,8 +1687,23 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
switch (res.flags & IORESOURCE_TYPE_BITS) { switch (res.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO: case IORESOURCE_IO:
memcpy(&pcie->io, &res, sizeof(res)); memcpy(&pcie->pio, &res, sizeof(res));
pcie->io.name = np->full_name; pcie->pio.name = np->full_name;
/*
* The Tegra PCIe host bridge uses this to program the
* mapping of the I/O space to the physical address,
* so we override the .start and .end fields here that
* of_pci_range_to_resource() converted to I/O space.
* We also set the IORESOURCE_MEM type to clarify that
* the resource is in the physical memory space.
*/
pcie->io.start = range.cpu_addr;
pcie->io.end = range.cpu_addr + range.size - 1;
pcie->io.flags = IORESOURCE_MEM;
pcie->io.name = "I/O";
memcpy(&res, &pcie->io, sizeof(res));
break; break;
case IORESOURCE_MEM: case IORESOURCE_MEM: