pci/layerscape: fix link and class issues to support ls2085a
1. LS2085a provides PCIE_LUT_DBG register rather than PCIE_LDBG
to show the link status, so the patch fixes it.
2. Increase the delay time to make sure that link training
has finished.
3. Return invalid value when accessing multi-function device
4. For LS2085a DBI_RO_WR_EN bit is cleared as default, so we
must set this bit before change DBI register value.
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c
index 1b0b814..402c519 100644
--- a/drivers/pci/pcie_layerscape.c
+++ b/drivers/pci/pcie_layerscape.c
@@ -49,11 +49,20 @@
#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
#define PCIE_ATU_UPPER_TARGET 0x91C
+/* LUT registers */
+#define PCIE_LUT_BASE 0x80000
+#define PCIE_LUT_DBG 0x7FC
+
+#define PCIE_DBI_RO_WR_EN 0x8bc
+
#define PCIE_LINK_CAP 0x7c
#define PCIE_LINK_SPEED_MASK 0xf
#define PCIE_LINK_STA 0x82
+#define LTSSM_STATE_MASK 0x3f
+#define LTSSM_PCIE_L0 0x11 /* L0 state */
+
-#define PCIE_DBI_SIZE (4 * 1024) /* 4K */
+#define PCIE_DBI_SIZE 0x100000 /* 1M */
struct ls_pcie {
int idx;
@@ -103,8 +112,6 @@
/* PEX1/2 Misc Ports Status Register */
#define LTSSM_STATE_SHIFT 20
-#define LTSSM_STATE_MASK 0x3f
-#define LTSSM_PCIE_L0 0x11 /* L0 state */
static int ls_pcie_link_state(struct ls_pcie *pcie)
{
@@ -121,18 +128,18 @@
return 1;
}
#else
-#define PCIE_LDBG 0x7FC
-
static int ls_pcie_link_state(struct ls_pcie *pcie)
{
u32 state;
- state = readl(pcie->dbi + PCIE_LDBG);
- if (state)
- return 1;
+ state = readl(pcie->dbi + PCIE_LUT_BASE + PCIE_LUT_DBG) &
+ LTSSM_STATE_MASK;
+ if (state < LTSSM_PCIE_L0) {
+ debug("....PCIe link error. LTSSM=0x%02x.\n", state);
+ return 0;
+ }
- debug("....PCIe link error.\n");
- return 0;
+ return 1;
}
#endif
@@ -148,7 +155,11 @@
/* Try to download speed to gen1 */
cap = readl(pcie->dbi + PCIE_LINK_CAP);
writel((cap & (~PCIE_LINK_SPEED_MASK)) | 1, pcie->dbi + PCIE_LINK_CAP);
- udelay(2000);
+ /*
+ * Notice: the following delay has critical impact on link training
+ * if too short (<30ms) the link doesn't get up.
+ */
+ mdelay(100);
state = ls_pcie_link_state(pcie);
if (state)
return state;
@@ -250,6 +261,10 @@
if (PCI_DEV(d) > 0)
return -EINVAL;
+ /* Controller does not support multi-function in RC mode */
+ if ((PCI_BUS(d) == hose->first_busno) && (PCI_FUNC(d) > 0))
+ return -EINVAL;
+
return 0;
}
@@ -326,8 +341,12 @@
pci_hose_write_config_dword(hose, dev, PCI_BASE_ADDRESS_0, 0);
/* program correct class for RC */
+ writel(1, pcie->dbi + PCIE_DBI_RO_WR_EN);
pci_hose_write_config_word(hose, dev, PCI_CLASS_DEVICE,
PCI_CLASS_BRIDGE_PCI);
+#ifndef CONFIG_LS102XA
+ writel(0, pcie->dbi + PCIE_DBI_RO_WR_EN);
+#endif
}
int ls_pcie_init_ctrl(int busno, enum srds_prtcl dev, struct ls_pcie_info *info)
@@ -416,9 +435,9 @@
}
/* Print the negotiated PCIe link width */
- pci_hose_read_config_word(hose, dev, PCIE_LINK_STA, &temp16);
- printf("x%d gen%d, regs @ 0x%lx\n", (temp16 & 0x3f0) >> 4,
- (temp16 & 0xf), info->regs);
+ pci_hose_read_config_word(hose, pdev, PCIE_LINK_STA, &temp16);
+ printf("x%d gen%d, regs @ 0x%lx\n", (temp16 & 0x3f0) >> 4,
+ (temp16 & 0xf), info->regs);
if (ep_mode)
return busno;