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authorMinghuan Lian <Minghuan.Lian@freescale.com>2015-10-16 09:19:19 +0200
committerBjorn Helgaas <bhelgaas@google.com>2015-11-02 22:38:39 +0100
commit5192ec7b24dd78bd82fe554995b8889d317da0c1 (patch)
tree62c94a209bece3ccec273eafbe55b39b04dde64e /drivers/pci
parentPCI: layerscape: Remove unused fields from struct ls_pcie (diff)
downloadlinux-5192ec7b24dd78bd82fe554995b8889d317da0c1.tar.xz
linux-5192ec7b24dd78bd82fe554995b8889d317da0c1.zip
PCI: layerscape: Add support for LS1043a and LS2080a
Both LS1043a and LS2080a are based on ARMv8 64-bit architecture and have similar PCIe implementation. LUT is added to controller. Add LS1043a and LS2080a support. [bhelgaas: move unused field removal into separate patch, include DT update] Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com> (DT update) Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Arnd Bergmann <arnd@arndb.de> (DT update)
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/host/Kconfig2
-rw-r--r--drivers/pci/host/pci-layerscape.c71
2 files changed, 68 insertions, 5 deletions
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index d5e58bae95cf..fcf08a03535d 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -105,7 +105,7 @@ config PCI_XGENE_MSI
config PCI_LAYERSCAPE
bool "Freescale Layerscape PCIe controller"
- depends on OF && ARM
+ depends on OF && (ARM || ARCH_LAYERSCAPE)
select PCIE_DW
select MFD_SYSCON
help
diff --git a/drivers/pci/host/pci-layerscape.c b/drivers/pci/host/pci-layerscape.c
index 7d61cbb9bab1..0f6dd4456409 100644
--- a/drivers/pci/host/pci-layerscape.c
+++ b/drivers/pci/host/pci-layerscape.c
@@ -3,7 +3,7 @@
*
* Copyright (C) 2014 Freescale Semiconductor.
*
- * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
+ * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -31,20 +31,26 @@
#define LTSSM_STATE_MASK 0x3f
#define LTSSM_PCIE_L0 0x11 /* L0 state */
-/* Symbol Timer Register and Filter Mask Register 1 */
-#define PCIE_STRFMR1 0x71c
+/* PEX Internal Configuration Registers */
+#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */
+#define PCIE_DBI_RO_WR_EN 0x8bc /* DBI Read-Only Write Enable Register */
+
+/* PEX LUT registers */
+#define PCIE_LUT_DBG 0x7FC /* PEX LUT Debug Register */
struct ls_pcie_drvdata {
+ u32 lut_offset;
+ u32 ltssm_shift;
struct pcie_host_ops *ops;
};
struct ls_pcie {
void __iomem *dbi;
+ void __iomem *lut;
struct regmap *scfg;
struct pcie_port pp;
const struct ls_pcie_drvdata *drvdata;
int index;
- int msi_irq;
};
#define to_ls_pcie(x) container_of(x, struct ls_pcie, pp)
@@ -59,6 +65,18 @@ static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
return header_type == PCI_HEADER_TYPE_BRIDGE;
}
+/* Clear multi-function bit */
+static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
+{
+ iowrite8(PCI_HEADER_TYPE_BRIDGE, pcie->dbi + PCI_HEADER_TYPE);
+}
+
+/* Fix class value */
+static void ls_pcie_fix_class(struct ls_pcie *pcie)
+{
+ iowrite16(PCI_CLASS_BRIDGE_PCI, pcie->dbi + PCI_CLASS_DEVICE);
+}
+
static int ls1021_pcie_link_up(struct pcie_port *pp)
{
u32 state;
@@ -107,17 +125,61 @@ static void ls1021_pcie_host_init(struct pcie_port *pp)
iowrite32(val, pcie->dbi + PCIE_STRFMR1);
}
+static int ls_pcie_link_up(struct pcie_port *pp)
+{
+ struct ls_pcie *pcie = to_ls_pcie(pp);
+ u32 state;
+
+ state = (ioread32(pcie->lut + PCIE_LUT_DBG) >>
+ pcie->drvdata->ltssm_shift) &
+ LTSSM_STATE_MASK;
+
+ if (state < LTSSM_PCIE_L0)
+ return 0;
+
+ return 1;
+}
+
+static void ls_pcie_host_init(struct pcie_port *pp)
+{
+ struct ls_pcie *pcie = to_ls_pcie(pp);
+
+ iowrite32(1, pcie->dbi + PCIE_DBI_RO_WR_EN);
+ ls_pcie_fix_class(pcie);
+ ls_pcie_clear_multifunction(pcie);
+ iowrite32(0, pcie->dbi + PCIE_DBI_RO_WR_EN);
+}
+
static struct pcie_host_ops ls1021_pcie_host_ops = {
.link_up = ls1021_pcie_link_up,
.host_init = ls1021_pcie_host_init,
};
+static struct pcie_host_ops ls_pcie_host_ops = {
+ .link_up = ls_pcie_link_up,
+ .host_init = ls_pcie_host_init,
+};
+
static struct ls_pcie_drvdata ls1021_drvdata = {
.ops = &ls1021_pcie_host_ops,
};
+static struct ls_pcie_drvdata ls1043_drvdata = {
+ .lut_offset = 0x10000,
+ .ltssm_shift = 24,
+ .ops = &ls_pcie_host_ops,
+};
+
+static struct ls_pcie_drvdata ls2080_drvdata = {
+ .lut_offset = 0x80000,
+ .ltssm_shift = 0,
+ .ops = &ls_pcie_host_ops,
+};
+
static const struct of_device_id ls_pcie_of_match[] = {
{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
+ { .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
+ { .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
{ },
};
MODULE_DEVICE_TABLE(of, ls_pcie_of_match);
@@ -164,6 +226,7 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
}
pcie->drvdata = match->data;
+ pcie->lut = pcie->dbi + pcie->drvdata->lut_offset;
if (!ls_pcie_is_bridge(pcie))
return -ENODEV;