Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 528 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
new file mode 100644
index 000000000..dc6dc2741
--- /dev/null
+++ b/arch/mips/pci/ops-bcm63xx.c
@@ -0,0 +1,528 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include "pci-bcm63xx.h"
+
+/*
+ * swizzle 32bits data to return only the needed part
+ */
+static int postprocess_read(u32 data, int where, unsigned int size)
+{
+        u32 ret;
+
+        ret = 0;
+        switch (size) {
+        case 1:
+                ret = (data >> ((where & 3) << 3)) & 0xff;
+                break;
+        case 2:
+                ret = (data >> ((where & 3) << 3)) & 0xffff;
+                break;
+        case 4:
+                ret = data;
+                break;
+        }
+        return ret;
+}
+
+static int preprocess_write(u32 orig_data, u32 val, int where,
+                            unsigned int size)
+{
+        u32 ret;
+
+        ret = 0;
+        switch (size) {
+        case 1:
+                ret = (orig_data & ~(0xff << ((where & 3) << 3))) |
+                        (val << ((where & 3) << 3));
+                break;
+        case 2:
+                ret = (orig_data & ~(0xffff << ((where & 3) << 3))) |
+                        (val << ((where & 3) << 3));
+                break;
+        case 4:
+                ret = val;
+                break;
+        }
+        return ret;
+}
+
+/*
+ * setup hardware for a configuration cycle with given parameters
+ */
+static int bcm63xx_setup_cfg_access(int type, unsigned int busn,
+                                    unsigned int devfn, int where)
+{
+        unsigned int slot, func, reg;
+        u32 val;
+
+        slot = PCI_SLOT(devfn);
+        func = PCI_FUNC(devfn);
+        reg = where >> 2;
+
+        /* sanity check */
+        if (slot > (MPI_L2PCFG_DEVNUM_MASK >> MPI_L2PCFG_DEVNUM_SHIFT))
+                return 1;
+
+        if (func > (MPI_L2PCFG_FUNC_MASK >> MPI_L2PCFG_FUNC_SHIFT))
+                return 1;
+
+        if (reg > (MPI_L2PCFG_REG_MASK >> MPI_L2PCFG_REG_SHIFT))
+                return 1;
+
+        /* ok, setup config access */
+        val = (reg << MPI_L2PCFG_REG_SHIFT);
+        val |= (func << MPI_L2PCFG_FUNC_SHIFT);
+        val |= (slot << MPI_L2PCFG_DEVNUM_SHIFT);
+        val |= MPI_L2PCFG_CFG_USEREG_MASK;
+        val |= MPI_L2PCFG_CFG_SEL_MASK;
+        /* type 0 cycle for local bus, type 1 cycle for anything else */
+        if (type != 0) {
+                /* FIXME: how to specify bus ??? */
+                val |= (1 << MPI_L2PCFG_CFG_TYPE_SHIFT);
+        }
+        bcm_mpi_writel(val, MPI_L2PCFG_REG);
+
+        return 0;
+}
+
+static int bcm63xx_do_cfg_read(int type, unsigned int busn,
+                                unsigned int devfn, int where, int size,
+                                u32 *val)
+{
+        u32 data;
+
+        /* two phase cycle, first we write address, then read data at
+         * another location, caller already has a spinlock so no need
+         * to add one here  */
+        if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+        iob();
+        data = le32_to_cpu(__raw_readl(pci_iospace_start));
+        /* restore IO space normal behaviour */
+        bcm_mpi_writel(0, MPI_L2PCFG_REG);
+
+        *val = postprocess_read(data, where, size);
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int bcm63xx_do_cfg_write(int type, unsigned int busn,
+                                 unsigned int devfn, int where, int size,
+                                 u32 val)
+{
+        u32 data;
+
+        /* two phase cycle, first we write address, then write data to
+         * another location, caller already has a spinlock so no need
+         * to add one here  */
+        if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+        iob();
+
+        data = le32_to_cpu(__raw_readl(pci_iospace_start));
+        data = preprocess_write(data, val, where, size);
+
+        __raw_writel(cpu_to_le32(data), pci_iospace_start);
+        wmb();
+        /* no way to know the access is done, we have to wait */
+        udelay(500);
+        /* restore IO space normal behaviour */
+        bcm_mpi_writel(0, MPI_L2PCFG_REG);
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int bcm63xx_pci_read(struct pci_bus *bus, unsigned int devfn,
+                             int where, int size, u32 *val)
+{
+        int type;
+
+        type = bus->parent ? 1 : 0;
+
+        if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return bcm63xx_do_cfg_read(type, bus->number, devfn,
+                                    where, size, val);
+}
+
+static int bcm63xx_pci_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        int type;
+
+        type = bus->parent ? 1 : 0;
+
+        if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return bcm63xx_do_cfg_write(type, bus->number, devfn,
+                                     where, size, val);
+}
+
+struct pci_ops bcm63xx_pci_ops = {
+        .read   = bcm63xx_pci_read,
+        .write  = bcm63xx_pci_write
+};
+
+#ifdef CONFIG_CARDBUS
+/*
+ * emulate configuration read access on a cardbus bridge
+ */
+#define FAKE_CB_BRIDGE_SLOT     0x1e
+
+static int fake_cb_bridge_bus_number = -1;
+
+static struct {
+        u16 pci_command;
+        u8 cb_latency;
+        u8 subordinate_busn;
+        u8 cardbus_busn;
+        u8 pci_busn;
+        int bus_assigned;
+        u16 bridge_control;
+
+        u32 mem_base0;
+        u32 mem_limit0;
+        u32 mem_base1;
+        u32 mem_limit1;
+
+        u32 io_base0;
+        u32 io_limit0;
+        u32 io_base1;
+        u32 io_limit1;
+} fake_cb_bridge_regs;
+
+static int fake_cb_bridge_read(int where, int size, u32 *val)
+{
+        unsigned int reg;
+        u32 data;
+
+        data = 0;
+        reg = where >> 2;
+        switch (reg) {
+        case (PCI_VENDOR_ID >> 2):
+        case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
+                /* create dummy vendor/device id from our cpu id */
+                data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM;
+                break;
+
+        case (PCI_COMMAND >> 2):
+                data = (PCI_STATUS_DEVSEL_SLOW << 16);
+                data |= fake_cb_bridge_regs.pci_command;
+                break;
+
+        case (PCI_CLASS_REVISION >> 2):
+                data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
+                break;
+
+        case (PCI_CACHE_LINE_SIZE >> 2):
+                data = (PCI_HEADER_TYPE_CARDBUS << 16);
+                break;
+
+        case (PCI_INTERRUPT_LINE >> 2):
+                /* bridge control */
+                data = (fake_cb_bridge_regs.bridge_control << 16);
+                /* pin:intA line:0xff */
+                data |= (0x1 << 8) | 0xff;
+                break;
+
+        case (PCI_CB_PRIMARY_BUS >> 2):
+                data = (fake_cb_bridge_regs.cb_latency << 24);
+                data |= (fake_cb_bridge_regs.subordinate_busn << 16);
+                data |= (fake_cb_bridge_regs.cardbus_busn << 8);
+                data |= fake_cb_bridge_regs.pci_busn;
+                break;
+
+        case (PCI_CB_MEMORY_BASE_0 >> 2):
+                data = fake_cb_bridge_regs.mem_base0;
+                break;
+
+        case (PCI_CB_MEMORY_LIMIT_0 >> 2):
+                data = fake_cb_bridge_regs.mem_limit0;
+                break;
+
+        case (PCI_CB_MEMORY_BASE_1 >> 2):
+                data = fake_cb_bridge_regs.mem_base1;
+                break;
+
+        case (PCI_CB_MEMORY_LIMIT_1 >> 2):
+                data = fake_cb_bridge_regs.mem_limit1;
+                break;
+
+        case (PCI_CB_IO_BASE_0 >> 2):
+                /* | 1 for 32bits io support */
+                data = fake_cb_bridge_regs.io_base0 | 0x1;
+                break;
+
+        case (PCI_CB_IO_LIMIT_0 >> 2):
+                data = fake_cb_bridge_regs.io_limit0;
+                break;
+
+        case (PCI_CB_IO_BASE_1 >> 2):
+                /* | 1 for 32bits io support */
+                data = fake_cb_bridge_regs.io_base1 | 0x1;
+                break;
+
+        case (PCI_CB_IO_LIMIT_1 >> 2):
+                data = fake_cb_bridge_regs.io_limit1;
+                break;
+        }
+
+        *val = postprocess_read(data, where, size);
+        return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * emulate configuration write access on a cardbus bridge
+ */
+static int fake_cb_bridge_write(int where, int size, u32 val)
+{
+        unsigned int reg;
+        u32 data, tmp;
+        int ret;
+
+        ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
+        if (ret != PCIBIOS_SUCCESSFUL)
+                return ret;
+
+        data = preprocess_write(data, val, where, size);
+
+        reg = where >> 2;
+        switch (reg) {
+        case (PCI_COMMAND >> 2):
+                fake_cb_bridge_regs.pci_command = (data & 0xffff);
+                break;
+
+        case (PCI_CB_PRIMARY_BUS >> 2):
+                fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
+                fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
+                fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
+                fake_cb_bridge_regs.pci_busn = data & 0xff;
+                if (fake_cb_bridge_regs.cardbus_busn)
+                        fake_cb_bridge_regs.bus_assigned = 1;
+                break;
+
+        case (PCI_INTERRUPT_LINE >> 2):
+                tmp = (data >> 16) & 0xffff;
+                /* disable memory prefetch support */
+                tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
+                tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
+                fake_cb_bridge_regs.bridge_control = tmp;
+                break;
+
+        case (PCI_CB_MEMORY_BASE_0 >> 2):
+                fake_cb_bridge_regs.mem_base0 = data;
+                break;
+
+        case (PCI_CB_MEMORY_LIMIT_0 >> 2):
+                fake_cb_bridge_regs.mem_limit0 = data;
+                break;
+
+        case (PCI_CB_MEMORY_BASE_1 >> 2):
+                fake_cb_bridge_regs.mem_base1 = data;
+                break;
+
+        case (PCI_CB_MEMORY_LIMIT_1 >> 2):
+                fake_cb_bridge_regs.mem_limit1 = data;
+                break;
+
+        case (PCI_CB_IO_BASE_0 >> 2):
+                fake_cb_bridge_regs.io_base0 = data;
+                break;
+
+        case (PCI_CB_IO_LIMIT_0 >> 2):
+                fake_cb_bridge_regs.io_limit0 = data;
+                break;
+
+        case (PCI_CB_IO_BASE_1 >> 2):
+                fake_cb_bridge_regs.io_base1 = data;
+                break;
+
+        case (PCI_CB_IO_LIMIT_1 >> 2):
+                fake_cb_bridge_regs.io_limit1 = data;
+                break;
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
+                           int where, int size, u32 *val)
+{
+        /* snoop access to slot 0x1e on root bus, we fake a cardbus
+         * bridge at this location */
+        if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
+                fake_cb_bridge_bus_number = bus->number;
+                return fake_cb_bridge_read(where, size, val);
+        }
+
+        /* a  configuration  cycle for  the  device  behind the  cardbus
+         * bridge is  actually done as a  type 0 cycle  on the primary
+         * bus. This means that only  one device can be on the cardbus
+         * bus */
+        if (fake_cb_bridge_regs.bus_assigned &&
+            bus->number == fake_cb_bridge_regs.cardbus_busn &&
+            PCI_SLOT(devfn) == 0)
+                return bcm63xx_do_cfg_read(0, 0,
+                                           PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
+                                           where, size, val);
+
+        return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
+                            int where, int size, u32 val)
+{
+        if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
+                fake_cb_bridge_bus_number = bus->number;
+                return fake_cb_bridge_write(where, size, val);
+        }
+
+        if (fake_cb_bridge_regs.bus_assigned &&
+            bus->number == fake_cb_bridge_regs.cardbus_busn &&
+            PCI_SLOT(devfn) == 0)
+                return bcm63xx_do_cfg_write(0, 0,
+                                            PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
+                                            where, size, val);
+
+        return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+struct pci_ops bcm63xx_cb_ops = {
+        .read   = bcm63xx_cb_read,
+        .write   = bcm63xx_cb_write,
+};
+
+/*
+ * only one IO window, so it  cannot be shared by PCI and cardbus, use
+ * fixup to choose and detect unhandled configuration
+ */
+static void bcm63xx_fixup(struct pci_dev *dev)
+{
+        static int io_window = -1;
+        int i, found, new_io_window;
+        u32 val;
+
+        /* look for any io resource */
+        found = 0;
+        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+                if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
+                        found = 1;
+                        break;
+                }
+        }
+
+        if (!found)
+                return;
+
+        /* skip our fake bus with only cardbus bridge on it */
+        if (dev->bus->number == fake_cb_bridge_bus_number)
+                return;
+
+        /* find on which bus the device is */
+        if (fake_cb_bridge_regs.bus_assigned &&
+            dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
+            PCI_SLOT(dev->devfn) == 0)
+                new_io_window = 1;
+        else
+                new_io_window = 0;
+
+        if (new_io_window == io_window)
+                return;
+
+        if (io_window != -1) {
+                printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
+                       "need IO, which hardware cannot do\n");
+                return;
+        }
+
+        printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
+               (new_io_window == 0) ? "PCI" : "cardbus");
+
+        val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
+        if (io_window)
+                val |= MPI_L2PREMAP_IS_CARDBUS_MASK;
+        else
+                val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
+        bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);
+
+        io_window = new_io_window;
+}
+
+DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
+#endif
+
+static int bcm63xx_pcie_can_access(struct pci_bus *bus, int devfn)
+{
+        switch (bus->number) {
+        case PCIE_BUS_BRIDGE:
+                return PCI_SLOT(devfn) == 0;
+        case PCIE_BUS_DEVICE:
+                if (PCI_SLOT(devfn) == 0)
+                        return bcm_pcie_readl(PCIE_DLSTATUS_REG)
+                                        & DLSTATUS_PHYLINKUP;
+                fallthrough;
+        default:
+                return false;
+        }
+}
+
+static int bcm63xx_pcie_read(struct pci_bus *bus, unsigned int devfn,
+                             int where, int size, u32 *val)
+{
+        u32 data;
+        u32 reg = where & ~3;
+
+        if (!bcm63xx_pcie_can_access(bus, devfn))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        if (bus->number == PCIE_BUS_DEVICE)
+                reg += PCIE_DEVICE_OFFSET;
+
+        data = bcm_pcie_readl(reg);
+
+        *val = postprocess_read(data, where, size);
+
+        return PCIBIOS_SUCCESSFUL;
+
+}
+
+static int bcm63xx_pcie_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        u32 data;
+        u32 reg = where & ~3;
+
+        if (!bcm63xx_pcie_can_access(bus, devfn))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        if (bus->number == PCIE_BUS_DEVICE)
+                reg += PCIE_DEVICE_OFFSET;
+
+
+        data = bcm_pcie_readl(reg);
+
+        data = preprocess_write(data, val, where, size);
+        bcm_pcie_writel(data, reg);
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+
+struct pci_ops bcm63xx_pcie_ops = {
+        .read   = bcm63xx_pcie_read,
+        .write  = bcm63xx_pcie_write
+};