[PATCH 7/8] PCI: iproc: Add outbound mapping support
Ray Jui
rjui at broadcom.com
Tue Sep 15 17:39:21 PDT 2015
Certain iProc SoCs require the PCIe outbound mapping to be configured in
SW. This patch adds support for those chips
Signed-off-by: Ray Jui <rjui at broadcom.com>
---
drivers/pci/host/pcie-iproc-platform.c | 27 ++++++++
drivers/pci/host/pcie-iproc.c | 113 +++++++++++++++++++++++++++++++++
drivers/pci/host/pcie-iproc.h | 17 +++++
3 files changed, 157 insertions(+)
diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
index 9aedc8e..c9550dc 100644
--- a/drivers/pci/host/pcie-iproc-platform.c
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -54,6 +54,33 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ if (of_property_read_bool(np, "brcm,pcie-ob")) {
+ u32 val;
+
+ ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
+ &val);
+ if (ret) {
+ dev_err(pcie->dev,
+ "missing brcm,pcie-ob-axi-offset property\n");
+ return ret;
+ }
+ pcie->ob.axi_offset = val;
+
+ ret = of_property_read_u32(np, "brcm,pcie-ob-window-size",
+ &val);
+ if (ret) {
+ dev_err(pcie->dev,
+ "missing brcm,pcie-ob-window-size property\n");
+ return ret;
+ }
+ pcie->ob.window_size = (resource_size_t)val * SZ_1M;
+
+ if (of_property_read_bool(np, "brcm,pcie-ob-oarr-size"))
+ pcie->ob.set_oarr_size = true;
+
+ pcie->need_ob_cfg = true;
+ }
+
/* PHY use is optional */
pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy");
if (IS_ERR(pcie->phy)) {
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 62e8085..2ba3c4b 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -66,6 +66,18 @@
#define PCIE_DL_ACTIVE_SHIFT 2
#define PCIE_DL_ACTIVE BIT(PCIE_DL_ACTIVE_SHIFT)
+#define OARR_VALID_SHIFT 0
+#define OARR_VALID BIT(OARR_VALID_SHIFT)
+#define OARR_SIZE_CFG_SHIFT 1
+#define OARR_SIZE_CFG BIT(OARR_SIZE_CFG_SHIFT)
+
+#define OARR_LO(window) (0xd20 + (window) * 8)
+#define OARR_HI(window) (0xd24 + (window) * 8)
+#define OMAP_LO(window) (0xd40 + (window) * 8)
+#define OMAP_HI(window) (0xd44 + (window) * 8)
+
+#define MAX_NUM_OB_WINDOWS 2
+
static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
{
struct iproc_pcie *pcie;
@@ -212,6 +224,99 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
writel(SYS_RC_INTX_MASK, pcie->base + SYS_RC_INTX_EN);
}
+/**
+ * Some iProc SoCs require the SW to configure the outbound address mapping
+ *
+ * Outbound address translation:
+ *
+ * iproc_pcie_address = axi_address - axi_offset
+ * OARR = iproc_pcie_address
+ * OMAP = pci_addr
+ *
+ * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
+ */
+static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
+ u64 pci_addr, resource_size_t size)
+{
+ struct iproc_pcie_ob *ob = &pcie->ob;
+ unsigned i;
+ u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
+
+ if (size > max_size) {
+ dev_err(pcie->dev,
+ "res size 0x%llx exceeds max supported size 0x%llx\n",
+ (u64)size, max_size);
+ return -EINVAL;
+ }
+
+ if (size % ob->window_size) {
+ dev_err(pcie->dev,
+ "res size 0x%llx needs to be multiple of "
+ "window size 0x%llx\n", (u64)size, ob->window_size);
+ return -EINVAL;
+ }
+
+ if (axi_addr < ob->axi_offset) {
+ dev_err(pcie->dev,
+ "axi address %pap less than offset %pap\n",
+ &axi_addr, &ob->axi_offset);
+ return -EINVAL;
+ }
+
+ /*
+ * Translate the AXI address to the internal address used by the iProc
+ * PCIe core before programming the OARR
+ */
+ axi_addr -= ob->axi_offset;
+
+ for (i = 0; i < MAX_NUM_OB_WINDOWS; i++) {
+ writel(lower_32_bits(axi_addr) | OARR_VALID |
+ (ob->set_oarr_size ? 1 : 0), pcie->base + OARR_LO(i));
+ writel(upper_32_bits(axi_addr), pcie->base + OARR_HI(i));
+ writel(lower_32_bits(pci_addr), pcie->base + OMAP_LO(i));
+ writel(upper_32_bits(pci_addr), pcie->base + OMAP_HI(i));
+
+ size -= ob->window_size;
+ if (size == 0)
+ break;
+
+ axi_addr += ob->window_size;
+ pci_addr += ob->window_size;
+ }
+
+ return 0;
+}
+
+static int iproc_pcie_map_ranges(struct iproc_pcie *pcie,
+ struct list_head *resources)
+{
+ struct resource_entry *window;
+ int ret;
+
+ resource_list_for_each_entry(window, resources) {
+ struct resource *res = window->res;
+ u64 res_type = resource_type(res);
+
+ switch (res_type) {
+ case IORESOURCE_IO:
+ case IORESOURCE_BUS:
+ break;
+ case IORESOURCE_MEM:
+ ret = iproc_pcie_setup_ob(pcie, res->start,
+ res->start - window->offset,
+ resource_size(res));
+ if (ret)
+ return ret;
+ break;
+ default:
+ dev_err(pcie->dev, "invalid resource %pR\n", res);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
{
int ret;
@@ -235,6 +340,14 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
iproc_pcie_reset(pcie);
+ if (pcie->need_ob_cfg) {
+ ret = iproc_pcie_map_ranges(pcie, res);
+ if (ret) {
+ dev_err(pcie->dev, "map failed\n");
+ goto err_power_off_phy;
+ }
+ }
+
#ifdef CONFIG_ARM
pcie->sysdata.private_data = pcie;
sysdata = &pcie->sysdata;
diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index ecaad57..d3dc940 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -15,6 +15,19 @@
#define _PCIE_IPROC_H
/**
+ * iProc PCIe outbound mapping
+ * @set_oarr_size: indicates the OARR size bit needs to be set
+ * @axi_offset: offset from the AXI address to the internal address used by
+ * the iProc PCIe core
+ * @window_size: outbound window size
+ */
+struct iproc_pcie_ob {
+ bool set_oarr_size;
+ resource_size_t axi_offset;
+ resource_size_t window_size;
+};
+
+/**
* iProc PCIe device
* @dev: pointer to device data structure
* @base: PCIe host controller I/O register base
@@ -23,6 +36,8 @@
* @phy: optional PHY device that controls the Serdes
* @irqs: interrupt IDs
* @map_irq: function callback to map interrupts
+ * @need_ob_cfg: indidates SW needs to configure the outbound mapping window
+ * @ob: outbound mapping parameters
*/
struct iproc_pcie {
struct device *dev;
@@ -33,6 +48,8 @@ struct iproc_pcie {
struct pci_bus *root_bus;
struct phy *phy;
int (*map_irq)(const struct pci_dev *, u8, u8);
+ bool need_ob_cfg;
+ struct iproc_pcie_ob ob;
};
int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res);
--
1.9.1
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