[U-Boot] [PATCH 4/7 v5] pci/layerscape: add support for LUT

[Stuart Yoder]

From: Stuart Yoder <stuart.yoder at nxp.com>

The per-PCI controller LUT (Look-Up-Table) is a 32-entry table
that maps PCI requester IDs (bus/dev/fun) to a stream ID.

This patch implements infrastructure to enable LUT initialization:
  -define registers offsets
  -add an index to 'struct ls_pcie' to track next available slot in LUT
  -add function to allocate the next available entry index
  -add function to program a LUT entry

Signed-off-by: Stuart Yoder <stuart.yoder at nxp.com>
---
-v5: check CONFIG_FSL_LSCH3 instead of SoC specific defines

 .../include/asm/arch-fsl-layerscape/immap_lsch3.h  |    4 +++
 drivers/pci/pcie_layerscape.c                      |   30 ++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
index 91f3ce8..d04e336 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
@@ -86,6 +86,10 @@
 #define PCIE_LUT_BASE				0x80000
 #define PCIE_LUT_LCTRL0				0x7F8
 #define PCIE_LUT_DBG				0x7FC
+#define PCIE_LUT_UDR(n)         (0x800 + (n) * 8)
+#define PCIE_LUT_LDR(n)         (0x804 + (n) * 8)
+#define PCIE_LUT_ENABLE         (1 << 31)
+#define PCIE_LUT_ENTRY_COUNT    32
 
 /* Device Configuration */
 #define DCFG_BASE		0x01e00000
diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c
index bb29222..5cc6855 100644
--- a/drivers/pci/pcie_layerscape.c
+++ b/drivers/pci/pcie_layerscape.c
@@ -93,6 +93,7 @@ struct ls_pcie {
 	void __iomem *dbi;
 	void __iomem *va_cfg0;
 	void __iomem *va_cfg1;
+	int next_lut_index;
 	struct pci_controller hose;
 };
 
@@ -482,6 +483,34 @@ static void ls_pcie_setup_ep(struct ls_pcie *pcie, struct ls_pcie_info *info)
 	}
 }
 
+#ifdef CONFIG_FSL_LSCH3
+/*
+ * Return next available LUT index.
+ */
+static int ls_pcie_next_lut_index(struct ls_pcie *pcie)
+{
+	if (pcie->next_lut_index < PCIE_LUT_ENTRY_COUNT)
+		return pcie->next_lut_index++;
+	else
+		return -1;  /* LUT is full */
+}
+
+/*
+ * Program a single LUT entry
+ */
+static void ls_pcie_lut_set_mapping(struct ls_pcie *pcie, int index, u32 devid,
+			     u32 streamid)
+{
+	void __iomem *lut;
+
+	lut = pcie->dbi + PCIE_LUT_BASE;
+
+	/* leave mask as all zeroes, want to match all bits */
+	writel((devid << 16), lut + PCIE_LUT_UDR(index));
+	writel(streamid | PCIE_LUT_ENABLE, lut + PCIE_LUT_LDR(index));
+}
+#endif
+
 int ls_pcie_init_ctrl(int busno, enum srds_prtcl dev, struct ls_pcie_info *info)
 {
 	struct ls_pcie *pcie;
@@ -513,6 +542,7 @@ int ls_pcie_init_ctrl(int busno, enum srds_prtcl dev, struct ls_pcie_info *info)
 	pcie->va_cfg1 = map_physmem(info->cfg1_phys,
 				    info->cfg1_size,
 				    MAP_NOCACHE);
+	pcie->next_lut_index = 0;
 
 	/* outbound memory */
 	pci_set_region(&hose->regions[0],
-- 
1.7.9.5