[POWERPC] Add mpc52xx/lite5200 PCI support

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 419 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/52xx/Makefile b/arch/powerpc/platforms/52xx/Makefile
index a46184a0c750..795b713ec9ee 100644
--- a/arch/powerpc/platforms/52xx/Makefile
+++ b/arch/powerpc/platforms/52xx/Makefile
@@ -3,6 +3,7 @@
 #
 ifeq ($(CONFIG_PPC_MERGE),y)
 obj-y                           += mpc52xx_pic.o mpc52xx_common.o
+obj-$(CONFIG_PCI)               += mpc52xx_pci.o
 endif
 
 obj-$(CONFIG_PPC_EFIKA)         += efika-setup.o efika-pci.o
diff --git a/arch/powerpc/platforms/52xx/lite5200.c b/arch/powerpc/platforms/52xx/lite5200.c
index 0f21bab33f6c..cdb16bfa6ca6 100644
--- a/arch/powerpc/platforms/52xx/lite5200.c
+++ b/arch/powerpc/platforms/52xx/lite5200.c
@@ -107,6 +107,12 @@ static void __init lite52xx_setup_arch(void)
         mpc52xx_setup_cpu();    /* Generic */
         lite52xx_setup_cpu();   /* Platorm specific */
 
+#ifdef CONFIG_PCI
+        np = of_find_node_by_type(np, "pci");
+        if (np)
+                mpc52xx_add_bridge(np);
+#endif
+
 #ifdef CONFIG_BLK_DEV_INITRD
         if (initrd_start)
                 ROOT_DEV = Root_RAM0;
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pci.c b/arch/powerpc/platforms/52xx/mpc52xx_pci.c
new file mode 100644
index 000000000000..faf161bdbc1c
--- /dev/null
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pci.c
@@ -0,0 +1,412 @@
+/*
+ * PCI code for the Freescale MPC52xx embedded CPU.
+ *
+ * Copyright (C) 2006 Secret Lab Technologies Ltd.
+ *                        Grant Likely <grant.likely@secretlab.ca>
+ * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#undef DEBUG
+
+#include <asm/pci.h>
+#include <asm/mpc52xx.h>
+#include <asm/delay.h>
+#include <asm/machdep.h>
+#include <linux/kernel.h>
+
+
+/* ======================================================================== */
+/* PCI windows config                                                       */
+/* ======================================================================== */
+
+#define MPC52xx_PCI_TARGET_IO   0xf0000000
+#define MPC52xx_PCI_TARGET_MEM  0x00000000
+
+
+/* ======================================================================== */
+/* Structures mapping & Defines for PCI Unit                                */
+/* ======================================================================== */
+
+#define MPC52xx_PCI_GSCR_BM             0x40000000
+#define MPC52xx_PCI_GSCR_PE             0x20000000
+#define MPC52xx_PCI_GSCR_SE             0x10000000
+#define MPC52xx_PCI_GSCR_XLB2PCI_MASK   0x07000000
+#define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT  24
+#define MPC52xx_PCI_GSCR_IPG2PCI_MASK   0x00070000
+#define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT  16
+#define MPC52xx_PCI_GSCR_BME            0x00004000
+#define MPC52xx_PCI_GSCR_PEE            0x00002000
+#define MPC52xx_PCI_GSCR_SEE            0x00001000
+#define MPC52xx_PCI_GSCR_PR             0x00000001
+
+
+#define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size)       \
+                ( ( (proc_ad) & 0xff000000 )                    | \
+                  ( (((size) - 1) >> 8) & 0x00ff0000 )          | \
+                  ( ((pci_ad) >> 16) & 0x0000ff00 ) )
+
+#define MPC52xx_PCI_IWCR_PACK(win0,win1,win2)   (((win0) << 24) | \
+                                                 ((win1) << 16) | \
+                                                 ((win2) <<  8))
+
+#define MPC52xx_PCI_IWCR_DISABLE        0x0
+#define MPC52xx_PCI_IWCR_ENABLE         0x1
+#define MPC52xx_PCI_IWCR_READ           0x0
+#define MPC52xx_PCI_IWCR_READ_LINE      0x2
+#define MPC52xx_PCI_IWCR_READ_MULTI     0x4
+#define MPC52xx_PCI_IWCR_MEM            0x0
+#define MPC52xx_PCI_IWCR_IO             0x8
+
+#define MPC52xx_PCI_TCR_P               0x01000000
+#define MPC52xx_PCI_TCR_LD              0x00010000
+
+#define MPC52xx_PCI_TBATR_DISABLE       0x0
+#define MPC52xx_PCI_TBATR_ENABLE        0x1
+
+struct mpc52xx_pci {
+        u32     idr;            /* PCI + 0x00 */
+        u32     scr;            /* PCI + 0x04 */
+        u32     ccrir;          /* PCI + 0x08 */
+        u32     cr1;            /* PCI + 0x0C */
+        u32     bar0;           /* PCI + 0x10 */
+        u32     bar1;           /* PCI + 0x14 */
+        u8      reserved1[16];  /* PCI + 0x18 */
+        u32     ccpr;           /* PCI + 0x28 */
+        u32     sid;            /* PCI + 0x2C */
+        u32     erbar;          /* PCI + 0x30 */
+        u32     cpr;            /* PCI + 0x34 */
+        u8      reserved2[4];   /* PCI + 0x38 */
+        u32     cr2;            /* PCI + 0x3C */
+        u8      reserved3[32];  /* PCI + 0x40 */
+        u32     gscr;           /* PCI + 0x60 */
+        u32     tbatr0;         /* PCI + 0x64 */
+        u32     tbatr1;         /* PCI + 0x68 */
+        u32     tcr;            /* PCI + 0x6C */
+        u32     iw0btar;        /* PCI + 0x70 */
+        u32     iw1btar;        /* PCI + 0x74 */
+        u32     iw2btar;        /* PCI + 0x78 */
+        u8      reserved4[4];   /* PCI + 0x7C */
+        u32     iwcr;           /* PCI + 0x80 */
+        u32     icr;            /* PCI + 0x84 */
+        u32     isr;            /* PCI + 0x88 */
+        u32     arb;            /* PCI + 0x8C */
+        u8      reserved5[104]; /* PCI + 0x90 */
+        u32     car;            /* PCI + 0xF8 */
+        u8      reserved6[4];   /* PCI + 0xFC */
+};
+
+
+/* ======================================================================== */
+/* PCI configuration acess                                                  */
+/* ======================================================================== */
+
+static int
+mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
+                                int offset, int len, u32 *val)
+{
+        struct pci_controller *hose = bus->sysdata;
+        u32 value;
+
+        if (ppc_md.pci_exclude_device)
+                if (ppc_md.pci_exclude_device(bus->number, devfn))
+                        return PCIBIOS_DEVICE_NOT_FOUND;
+
+        out_be32(hose->cfg_addr,
+                (1 << 31) |
+                ((bus->number - hose->bus_offset) << 16) |
+                (devfn << 8) |
+                (offset & 0xfc));
+        mb();
+
+#if defined(CONFIG_PPC_MPC5200_BUGFIX)
+        if (bus->number != hose->bus_offset) {
+                /* workaround for the bug 435 of the MPC5200 (L25R);
+                 * Don't do 32 bits config access during type-1 cycles */
+                switch (len) {
+                      case 1:
+                        value = in_8(((u8 __iomem *)hose->cfg_data) +
+                                     (offset & 3));
+                        break;
+                      case 2:
+                        value = in_le16(((u16 __iomem *)hose->cfg_data) +
+                                        ((offset>>1) & 1));
+                        break;
+
+                      default:
+                        value = in_le16((u16 __iomem *)hose->cfg_data) |
+                                (in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
+                        break;
+                }
+        }
+        else
+#endif
+        {
+                value = in_le32(hose->cfg_data);
+
+                if (len != 4) {
+                        value >>= ((offset & 0x3) << 3);
+                        value &= 0xffffffff >> (32 - (len << 3));
+                }
+        }
+
+        *val = value;
+
+        out_be32(hose->cfg_addr, 0);
+        mb();
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
+                                int offset, int len, u32 val)
+{
+        struct pci_controller *hose = bus->sysdata;
+        u32 value, mask;
+
+        if (ppc_md.pci_exclude_device)
+                if (ppc_md.pci_exclude_device(bus->number, devfn))
+                        return PCIBIOS_DEVICE_NOT_FOUND;
+
+        out_be32(hose->cfg_addr,
+                (1 << 31) |
+                ((bus->number - hose->bus_offset) << 16) |
+                (devfn << 8) |
+                (offset & 0xfc));
+        mb();
+
+#if defined(CONFIG_PPC_MPC5200_BUGFIX)
+        if (bus->number != hose->bus_offset) {
+                /* workaround for the bug 435 of the MPC5200 (L25R);
+                 * Don't do 32 bits config access during type-1 cycles */
+                switch (len) {
+                      case 1:
+                        out_8(((u8 __iomem *)hose->cfg_data) +
+                                (offset & 3), val);
+                        break;
+                      case 2:
+                        out_le16(((u16 __iomem *)hose->cfg_data) +
+                                ((offset>>1) & 1), val);
+                        break;
+
+                      default:
+                        out_le16((u16 __iomem *)hose->cfg_data,
+                                (u16)val);
+                        out_le16(((u16 __iomem *)hose->cfg_data) + 1,
+                                (u16)(val>>16));
+                        break;
+                }
+        }
+        else
+#endif
+        {
+                if (len != 4) {
+                        value = in_le32(hose->cfg_data);
+
+                        offset = (offset & 0x3) << 3;
+                        mask = (0xffffffff >> (32 - (len << 3)));
+                        mask <<= offset;
+
+                        value &= ~mask;
+                        val = value | ((val << offset) & mask);
+                }
+
+                out_le32(hose->cfg_data, val);
+        }
+        mb();
+
+        out_be32(hose->cfg_addr, 0);
+        mb();
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops mpc52xx_pci_ops = {
+        .read  = mpc52xx_pci_read_config,
+        .write = mpc52xx_pci_write_config
+};
+
+
+/* ======================================================================== */
+/* PCI setup                                                                */
+/* ======================================================================== */
+
+static void __init
+mpc52xx_pci_setup(struct pci_controller *hose,
+                  struct mpc52xx_pci __iomem *pci_regs)
+{
+        struct resource *res;
+        u32 tmp;
+        int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0;
+
+        pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs);
+
+        /* pci_process_bridge_OF_ranges() found all our addresses for us;
+         * now store them in the right places */
+        hose->cfg_addr = &pci_regs->car;
+        hose->cfg_data = hose->io_base_virt;
+
+        /* Control regs */
+        tmp = in_be32(&pci_regs->scr);
+        tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
+        out_be32(&pci_regs->scr, tmp);
+
+        /* Memory windows */
+        res = &hose->mem_resources[0];
+        if (res->flags) {
+                pr_debug("mem_resource[0] = {.start=%x, .end=%x, .flags=%lx}\n",
+                         res->start, res->end, res->flags);
+                out_be32(&pci_regs->iw0btar,
+                         MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
+                                  res->end - res->start + 1));
+                iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
+                if (res->flags & IORESOURCE_PREFETCH)
+                        iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI;
+                else
+                        iwcr0 |= MPC52xx_PCI_IWCR_READ;
+        }
+
+        res = &hose->mem_resources[1];
+        if (res->flags) {
+                pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n",
+                         res->start, res->end, res->flags);
+                out_be32(&pci_regs->iw1btar,
+                         MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
+                                  res->end - res->start + 1));
+                iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
+                if (res->flags & IORESOURCE_PREFETCH)
+                        iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI;
+                else
+                        iwcr1 |= MPC52xx_PCI_IWCR_READ;
+        }
+
+        /* IO resources */
+        res = &hose->io_resource;
+        if (!res) {
+                printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__);
+                return;
+        }
+        pr_debug(".io_resource={.start=%x,.end=%x,.flags=%lx} "
+                 ".io_base_phys=0x%p\n",
+                 res->start, res->end, res->flags, (void*)hose->io_base_phys);
+        out_be32(&pci_regs->iw2btar,
+                 MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys,
+                                                res->start,
+                                                res->end - res->start + 1));
+        iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO;
+
+        /* Set all the IWCR fields at once; they're in the same reg */
+        out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));
+
+        out_be32(&pci_regs->tbatr0,
+                MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_IO );
+        out_be32(&pci_regs->tbatr1,
+                MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_MEM );
+
+        out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD);
+
+        tmp = in_be32(&pci_regs->gscr);
+#if 0
+        /* Reset the exteral bus ( internal PCI controller is NOT resetted ) */
+        /* Not necessary and can be a bad thing if for example the bootloader
+           is displaying a splash screen or ... Just left here for
+           documentation purpose if anyone need it */
+        out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
+        udelay(50);
+#endif
+
+        /* Make sure the PCI bridge is out of reset */
+        out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
+}
+
+static void
+mpc52xx_pci_fixup_resources(struct pci_dev *dev)
+{
+        int i;
+
+        pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n",
+                 dev->vendor, dev->device);
+
+        /* We don't rely on boot loader for PCI and resets all
+           devices */
+        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+                struct resource *res = &dev->resource[i];
+                if (res->end > res->start) {    /* Only valid resources */
+                        res->end -= res->start;
+                        res->start = 0;
+                        res->flags |= IORESOURCE_UNSET;
+                }
+        }
+
+        /* The PCI Host bridge of MPC52xx has a prefetch memory resource
+           fixed to 1Gb. Doesn't fit in the resource system so we remove it */
+        if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
+             (   dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200
+              || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
+                struct resource *res = &dev->resource[1];
+                res->start = res->end = res->flags = 0;
+        }
+}
+
+int __init
+mpc52xx_add_bridge(struct device_node *node)
+{
+        int len;
+        struct mpc52xx_pci __iomem *pci_regs;
+        struct pci_controller *hose;
+        const int *bus_range;
+        struct resource rsrc;
+
+        pr_debug("Adding MPC52xx PCI host bridge %s\n", node->full_name);
+
+        pci_assign_all_buses = 1;
+
+        if (of_address_to_resource(node, 0, &rsrc) != 0) {
+                printk(KERN_ERR "Can't get %s resources\n", node->full_name);
+                return -EINVAL;
+        }
+
+        bus_range = get_property(node, "bus-range", &len);
+        if (bus_range == NULL || len < 2 * sizeof(int)) {
+                printk(KERN_WARNING "Can't get %s bus-range, assume bus 0\n",
+                       node->full_name);
+                bus_range = NULL;
+        }
+
+        /* There are some PCI quirks on the 52xx, register the hook to
+         * fix them. */
+        ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
+
+        /* Alloc and initialize the pci controller.  Values in the device
+         * tree are needed to configure the 52xx PCI controller.  Rather
+         * than parse the tree here, let pci_process_bridge_OF_ranges()
+         * do it for us and extract the values after the fact */
+        hose = pcibios_alloc_controller();
+        if (!hose)
+                return -ENOMEM;
+
+        hose->arch_data = node;
+        hose->set_cfg_type = 1;
+
+        hose->first_busno = bus_range ? bus_range[0] : 0;
+        hose->last_busno = bus_range ? bus_range[1] : 0xff;
+
+        hose->bus_offset = 0;
+        hose->ops = &mpc52xx_pci_ops;
+
+        pci_regs = ioremap(rsrc.start, rsrc.end - rsrc.start + 1);
+        if (!pci_regs)
+                return -ENOMEM;
+
+        pci_process_bridge_OF_ranges(hose, node, 1);
+
+        /* Finish setting up PCI using values obtained by
+         * pci_proces_bridge_OF_ranges */
+        mpc52xx_pci_setup(hose, pci_regs);
+
+        return 0;
+}