powerpc/fsl_pci: Add MPC83xx PCI-E controller RC mode support

This patch adds support for PCI-Express controllers as found on the
newer MPC83xx chips.

The work is loosely based on the Tony Li's patch[1], but unlike the
original patch, this patch implements sliding window for the Type 1
transactions using outbound window translations, so we don't have to
ioremap the whole PCI-E configuration space.

[1] http://ozlabs.org/pipermail/linuxppc-dev/2008-January/049028.html

Signed-off-by: Tony Li <tony.li@freescale.com>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 228 insertions, 24 deletions

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 9817f63723dd..78021d8afc53 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -1,12 +1,16 @@
 /*
  * MPC83xx/85xx/86xx PCI/PCIE support routing.
  *
- * Copyright 2007,2008 Freescale Semiconductor, Inc
+ * Copyright 2007-2009 Freescale Semiconductor, Inc.
+ * Copyright 2008-2009 MontaVista Software, Inc.
  *
  * Initial author: Xianghua Xiao <x.xiao@freescale.com>
  * Recode: ZHANG WEI <wei.zhang@freescale.com>
  * Rewrite the routing for Frescale PCI and PCI Express
  *      Roy Zang <tie-fei.zang@freescale.com>
+ * MPC83xx PCI-Express support:
+ *      Tony Li <tony.li@freescale.com>
+ *      Anton Vorontsov <avorontsov@ru.mvista.com>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
@@ -27,6 +31,29 @@
 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>
 
+static int fsl_pcie_bus_fixup;
+
+static void __init quirk_fsl_pcie_header(struct pci_dev *dev)
+{
+        /* if we aren't a PCIe don't bother */
+        if (!pci_find_capability(dev, PCI_CAP_ID_EXP))
+                return;
+
+        dev->class = PCI_CLASS_BRIDGE_PCI << 8;
+        fsl_pcie_bus_fixup = 1;
+        return;
+}
+
+static int __init fsl_pcie_check_link(struct pci_controller *hose)
+{
+        u32 val;
+
+        early_read_config_dword(hose, 0, 0, PCIE_LTSSM, &val);
+        if (val < PCIE_LTSSM_L0)
+                return 1;
+        return 0;
+}
+
 #if defined(CONFIG_PPC_85xx) || defined(CONFIG_PPC_86xx)
 static int __init setup_one_atmu(struct ccsr_pci __iomem *pci,
         unsigned int index, const struct resource *res,
@@ -159,28 +186,6 @@ static void __init setup_pci_pcsrbar(struct pci_controller *hose)
 #endif
 }
 
-static int fsl_pcie_bus_fixup;
-
-static void __init quirk_fsl_pcie_header(struct pci_dev *dev)
-{
-        /* if we aren't a PCIe don't bother */
-        if (!pci_find_capability(dev, PCI_CAP_ID_EXP))
-                return ;
-
-        dev->class = PCI_CLASS_BRIDGE_PCI << 8;
-        fsl_pcie_bus_fixup = 1;
-        return ;
-}
-
-static int __init fsl_pcie_check_link(struct pci_controller *hose)
-{
-        u32 val;
-        early_read_config_dword(hose, 0, 0, PCIE_LTSSM, &val);
-        if (val < PCIE_LTSSM_L0)
-                return 1;
-        return 0;
-}
-
 void fsl_pcibios_fixup_bus(struct pci_bus *bus)
 {
         struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
@@ -294,8 +299,184 @@ DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8610, quirk_fsl_pcie_header);
 #endif /* CONFIG_PPC_85xx || CONFIG_PPC_86xx */
 
 #if defined(CONFIG_PPC_83xx) || defined(CONFIG_PPC_MPC512x)
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8314E, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8314, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8315E, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8315, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8377E, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8377, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8378E, quirk_fsl_pcie_header);
+DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8378, quirk_fsl_pcie_header);
+
+struct mpc83xx_pcie_priv {
+        void __iomem *cfg_type0;
+        void __iomem *cfg_type1;
+        u32 dev_base;
+};
+
+/*
+ * With the convention of u-boot, the PCIE outbound window 0 serves
+ * as configuration transactions outbound.
+ */
+#define PEX_OUTWIN0_BAR         0xCA4
+#define PEX_OUTWIN0_TAL         0xCA8
+#define PEX_OUTWIN0_TAH         0xCAC
+
+static int mpc83xx_pcie_exclude_device(struct pci_bus *bus, unsigned int devfn)
+{
+        struct pci_controller *hose = bus->sysdata;
+
+        if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+        /*
+         * Workaround for the HW bug: for Type 0 configure transactions the
+         * PCI-E controller does not check the device number bits and just
+         * assumes that the device number bits are 0.
+         */
+        if (bus->number == hose->first_busno ||
+                        bus->primary == hose->first_busno) {
+                if (devfn & 0xf8)
+                        return PCIBIOS_DEVICE_NOT_FOUND;
+        }
+
+        if (ppc_md.pci_exclude_device) {
+                if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
+                        return PCIBIOS_DEVICE_NOT_FOUND;
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static void __iomem *mpc83xx_pcie_remap_cfg(struct pci_bus *bus,
+                                            unsigned int devfn, int offset)
+{
+        struct pci_controller *hose = bus->sysdata;
+        struct mpc83xx_pcie_priv *pcie = hose->dn->data;
+        u8 bus_no = bus->number - hose->first_busno;
+        u32 dev_base = bus_no << 24 | devfn << 16;
+        int ret;
+
+        ret = mpc83xx_pcie_exclude_device(bus, devfn);
+        if (ret)
+                return NULL;
+
+        offset &= 0xfff;
+
+        /* Type 0 */
+        if (bus->number == hose->first_busno)
+                return pcie->cfg_type0 + offset;
+
+        if (pcie->dev_base == dev_base)
+                goto mapped;
+
+        out_le32(pcie->cfg_type0 + PEX_OUTWIN0_TAL, dev_base);
+
+        pcie->dev_base = dev_base;
+mapped:
+        return pcie->cfg_type1 + offset;
+}
+
+static int mpc83xx_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
+                                    int offset, int len, u32 *val)
+{
+        void __iomem *cfg_addr;
+
+        cfg_addr = mpc83xx_pcie_remap_cfg(bus, devfn, offset);
+        if (!cfg_addr)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        switch (len) {
+        case 1:
+                *val = in_8(cfg_addr);
+                break;
+        case 2:
+                *val = in_le16(cfg_addr);
+                break;
+        default:
+                *val = in_le32(cfg_addr);
+                break;
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int mpc83xx_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
+                                     int offset, int len, u32 val)
+{
+        void __iomem *cfg_addr;
+
+        cfg_addr = mpc83xx_pcie_remap_cfg(bus, devfn, offset);
+        if (!cfg_addr)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        switch (len) {
+        case 1:
+                out_8(cfg_addr, val);
+                break;
+        case 2:
+                out_le16(cfg_addr, val);
+                break;
+        default:
+                out_le32(cfg_addr, val);
+                break;
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops mpc83xx_pcie_ops = {
+        .read = mpc83xx_pcie_read_config,
+        .write = mpc83xx_pcie_write_config,
+};
+
+static int __init mpc83xx_pcie_setup(struct pci_controller *hose,
+                                     struct resource *reg)
+{
+        struct mpc83xx_pcie_priv *pcie;
+        u32 cfg_bar;
+        int ret = -ENOMEM;
+
+        pcie = zalloc_maybe_bootmem(sizeof(*pcie), GFP_KERNEL);
+        if (!pcie)
+                return ret;
+
+        pcie->cfg_type0 = ioremap(reg->start, resource_size(reg));
+        if (!pcie->cfg_type0)
+                goto err0;
+
+        cfg_bar = in_le32(pcie->cfg_type0 + PEX_OUTWIN0_BAR);
+        if (!cfg_bar) {
+                /* PCI-E isn't configured. */
+                ret = -ENODEV;
+                goto err1;
+        }
+
+        pcie->cfg_type1 = ioremap(cfg_bar, 0x1000);
+        if (!pcie->cfg_type1)
+                goto err1;
+
+        WARN_ON(hose->dn->data);
+        hose->dn->data = pcie;
+        hose->ops = &mpc83xx_pcie_ops;
+
+        out_le32(pcie->cfg_type0 + PEX_OUTWIN0_TAH, 0);
+        out_le32(pcie->cfg_type0 + PEX_OUTWIN0_TAL, 0);
+
+        if (fsl_pcie_check_link(hose))
+                hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK;
+
+        return 0;
+err1:
+        iounmap(pcie->cfg_type0);
+err0:
+        kfree(pcie);
+        return ret;
+
+}
+
 int __init mpc83xx_add_bridge(struct device_node *dev)
 {
+        int ret;
         int len;
         struct pci_controller *hose;
         struct resource rsrc_reg;
@@ -303,6 +484,11 @@ int __init mpc83xx_add_bridge(struct device_node *dev)
         const int *bus_range;
         int primary;
 
+        if (!of_device_is_available(dev)) {
+                pr_warning("%s: disabled by the firmware.\n",
+                           dev->full_name);
+                return -ENODEV;
+        }
         pr_debug("Adding PCI host bridge %s\n", dev->full_name);
 
         /* Fetch host bridge registers address */
@@ -350,7 +536,14 @@ int __init mpc83xx_add_bridge(struct device_node *dev)
         hose->first_busno = bus_range ? bus_range[0] : 0;
         hose->last_busno = bus_range ? bus_range[1] : 0xff;
 
-        setup_indirect_pci(hose, rsrc_cfg.start, rsrc_cfg.start + 4, 0);
+        if (of_device_is_compatible(dev, "fsl,mpc8314-pcie")) {
+                ret = mpc83xx_pcie_setup(hose, &rsrc_reg);
+                if (ret)
+                        goto err0;
+        } else {
+                setup_indirect_pci(hose, rsrc_cfg.start,
+                                   rsrc_cfg.start + 4, 0);
+        }
 
         printk(KERN_INFO "Found FSL PCI host bridge at 0x%016llx. "
                "Firmware bus number: %d->%d\n",
@@ -365,5 +558,8 @@ int __init mpc83xx_add_bridge(struct device_node *dev)
         pci_process_bridge_OF_ranges(hose, dev, primary);
 
         return 0;
+err0:
+        pcibios_free_controller(hose);
+        return ret;
 }
 #endif /* CONFIG_PPC_83xx */
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index febc10ed3858..ff9b7be2b791 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2217,6 +2217,14 @@
 #define PCI_DEVICE_ID_TDI_EHCI          0x0101
 
 #define PCI_VENDOR_ID_FREESCALE         0x1957
+#define PCI_DEVICE_ID_MPC8315E          0x00b4
+#define PCI_DEVICE_ID_MPC8315           0x00b5
+#define PCI_DEVICE_ID_MPC8314E          0x00b6
+#define PCI_DEVICE_ID_MPC8314           0x00b7
+#define PCI_DEVICE_ID_MPC8378E          0x00c4
+#define PCI_DEVICE_ID_MPC8378           0x00c5
+#define PCI_DEVICE_ID_MPC8377E          0x00c6
+#define PCI_DEVICE_ID_MPC8377           0x00c7
 #define PCI_DEVICE_ID_MPC8548E          0x0012
 #define PCI_DEVICE_ID_MPC8548           0x0013
 #define PCI_DEVICE_ID_MPC8543E          0x0014