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Subject[PATCH 4/4] PCI/dwc: Add more than 4GiB range support
Date
From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

As each viewport support upto 4GiB, to support greater than 4GiB range
we need multiple viewport for MEM windows. And this patch explicitly
assigned the last (if there are only 2 viewports) or last 2 viewports
for CFG and IO windows and the rests for MEM windows.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
.../pci/controller/dwc/pcie-designware-host.c | 80 ++++++++++++++++---
drivers/pci/controller/dwc/pcie-designware.h | 3 +
2 files changed, 70 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index ecacce016489..1b083873835e 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -346,6 +346,35 @@ int dw_pcie_host_init(struct pcie_port *pp)
dev_err(dev, "Missing *config* reg space\n");
}

+ /*
+ * If vendor's platform driver has set the num_viewport and it is
+ * not less than 2, skip getting the num_viewport from DT here.
+ */
+ if (pci->num_viewport < 2) {
+ ret = of_property_read_u32(np, "num-viewport",
+ &pci->num_viewport);
+ if (ret || pci->num_viewport < 2)
+ pci->num_viewport = 2;
+ }
+
+ /*
+ * if there are only 2 viewports, assign the last viewport for
+ * both CFG and IO window, otherwise assign the last 2 viewport
+ * for CFG and IO window specific. And the rest viewports are
+ * assigned to MEM windows.
+ */
+ if (pci->num_viewport == 2) {
+ pp->cfg_idx = pp->io_idx = PCIE_ATU_REGION_INDEX1;
+ pp->mem_wins = 1;
+ } else {
+ pp->cfg_idx = pci->num_viewport - 1;
+ pp->io_idx = pci->num_viewport - 2;
+ pp->mem_wins = pci->num_viewport - 2;
+ }
+
+ dev_dbg(dev, "CFG window index: %d, IO window index: %d, Total MEM window number: %d\n",
+ pp->cfg_idx, pp->io_idx, pp->mem_wins);
+
bridge = pci_alloc_host_bridge(0);
if (!bridge)
return -ENOMEM;
@@ -534,12 +563,12 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
va_cfg_base = pp->va_cfg1_base;
}

- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
+ dw_pcie_prog_outbound_atu(pci, pp->cfg_idx,
type, cpu_addr,
busdev, cfg_size);
ret = dw_pcie_read(va_cfg_base + where, size, val);
- if (pci->num_viewport <= 2)
- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
+ if (pp->cfg_idx == pp->io_idx)
+ dw_pcie_prog_outbound_atu(pci, pp->io_idx,
PCIE_ATU_TYPE_IO, pp->io_base,
pp->io_bus_addr, pp->io_size);

@@ -573,12 +602,12 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
va_cfg_base = pp->va_cfg1_base;
}

- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
+ dw_pcie_prog_outbound_atu(pci, pp->cfg_idx,
type, cpu_addr,
busdev, cfg_size);
ret = dw_pcie_write(va_cfg_base + where, size, val);
- if (pci->num_viewport <= 2)
- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
+ if (pp->cfg_idx == pp->io_idx)
+ dw_pcie_prog_outbound_atu(pci, pp->io_idx,
PCIE_ATU_TYPE_IO, pp->io_base,
pp->io_bus_addr, pp->io_size);

@@ -652,6 +681,9 @@ static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
void dw_pcie_setup_rc(struct pcie_port *pp)
{
u32 val, ctrl, num_ctrls;
+ u64 remain_size, base, win_size;
+ phys_addr_t bus_addr;
+ int i;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);

dw_pcie_setup(pci);
@@ -700,13 +732,35 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
dev_dbg(pci->dev, "iATU unroll: %s\n",
pci->iatu_unroll_enabled ? "enabled" : "disabled");

- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
- PCIE_ATU_TYPE_MEM, pp->mem_base,
- pp->mem_bus_addr, pp->mem_size);
- if (pci->num_viewport > 2)
- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX2,
- PCIE_ATU_TYPE_IO, pp->io_base,
- pp->io_bus_addr, pp->io_size);
+ remain_size = pp->mem_size;
+ base = pp->mem_base;
+ bus_addr = pp->mem_bus_addr;
+
+ for (i = 0; remain_size > 0 && i < pp->mem_wins; i++) {
+ /*
+ * The maximum region size is 4 GB, and a region
+ * must not cross a 4 GB boundary.
+ */
+ win_size = SZ_4G - (base & (SZ_4G - 1));
+ win_size = min(win_size, remain_size);
+ dev_dbg(pci->dev, "iATU: MEM window %d: base = %llx, bus_addr = %llx, size = %llx\n",
+ i, base, bus_addr, win_size);
+
+ dw_pcie_prog_outbound_atu(pci, i,
+ PCIE_ATU_TYPE_MEM, base,
+ bus_addr, win_size);
+
+ base += win_size;
+ bus_addr += win_size;
+ remain_size -= win_size;
+ }
+
+ if (remain_size > 0)
+ dev_info(pci->dev, "iATU: MEM window isn't enough\n");
+
+ dw_pcie_prog_outbound_atu(pci, pp->io_idx,
+ PCIE_ATU_TYPE_IO, pp->io_base,
+ pp->io_bus_addr, pp->io_size);
}

dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index a438c3879aa9..20146b8729b3 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -148,12 +148,15 @@ struct pcie_port {
u64 cfg1_base;
void __iomem *va_cfg1_base;
u32 cfg1_size;
+ u32 cfg_idx;
resource_size_t io_base;
phys_addr_t io_bus_addr;
u32 io_size;
+ u32 io_idx;
u64 mem_base;
phys_addr_t mem_bus_addr;
u64 mem_size;
+ u32 mem_wins;
struct resource *cfg;
struct resource *io;
struct resource *mem;
--
2.17.1
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