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

1 files changed, 134 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-msc.c b/arch/mips/pci/ops-msc.c
new file mode 100644
index 000000000..1f438baaf
--- /dev/null
+++ b/arch/mips/pci/ops-msc.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 1999, 2000, 2004, 2005  MIPS Technologies, Inc.
+ *    All rights reserved.
+ *    Authors: Carsten Langgaard <carstenl@mips.com>
+ *             Maciej W. Rozycki <macro@mips.com>
+ * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
+ *
+ * MIPS boards specific PCI support.
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+#include <asm/mips-boards/msc01_pci.h>
+
+#define PCI_ACCESS_READ  0
+#define PCI_ACCESS_WRITE 1
+
+/*
+ *  PCI configuration cycle AD bus definition
+ */
+/* Type 0 */
+#define PCI_CFG_TYPE0_REG_SHF           0
+#define PCI_CFG_TYPE0_FUNC_SHF          8
+
+/* Type 1 */
+#define PCI_CFG_TYPE1_REG_SHF           0
+#define PCI_CFG_TYPE1_FUNC_SHF          8
+#define PCI_CFG_TYPE1_DEV_SHF           11
+#define PCI_CFG_TYPE1_BUS_SHF           16
+
+static int msc_pcibios_config_access(unsigned char access_type,
+        struct pci_bus *bus, unsigned int devfn, int where, u32 * data)
+{
+        unsigned char busnum = bus->number;
+        u32 intr;
+
+        /* Clear status register bits. */
+        MSC_WRITE(MSC01_PCI_INTSTAT,
+                  (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT));
+
+        MSC_WRITE(MSC01_PCI_CFGADDR,
+                  ((busnum << MSC01_PCI_CFGADDR_BNUM_SHF) |
+                   (PCI_SLOT(devfn) << MSC01_PCI_CFGADDR_DNUM_SHF) |
+                   (PCI_FUNC(devfn) << MSC01_PCI_CFGADDR_FNUM_SHF) |
+                   ((where / 4) << MSC01_PCI_CFGADDR_RNUM_SHF)));
+
+        /* Perform access */
+        if (access_type == PCI_ACCESS_WRITE)
+                MSC_WRITE(MSC01_PCI_CFGDATA, *data);
+        else
+                MSC_READ(MSC01_PCI_CFGDATA, *data);
+
+        /* Detect Master/Target abort */
+        MSC_READ(MSC01_PCI_INTSTAT, intr);
+        if (intr & (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT)) {
+                /* Error occurred */
+
+                /* Clear bits */
+                MSC_WRITE(MSC01_PCI_INTSTAT,
+                          (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT));
+
+                return -1;
+        }
+
+        return 0;
+}
+
+
+/*
+ * We can't address 8 and 16 bit words directly.  Instead we have to
+ * read/write a 32bit word and mask/modify the data we actually want.
+ */
+static int msc_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+                             int where, int size, u32 * val)
+{
+        u32 data = 0;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        if (msc_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
+                                      &data))
+                return -1;
+
+        if (size == 1)
+                *val = (data >> ((where & 3) << 3)) & 0xff;
+        else if (size == 2)
+                *val = (data >> ((where & 3) << 3)) & 0xffff;
+        else
+                *val = data;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int msc_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        u32 data = 0;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        if (size == 4)
+                data = val;
+        else {
+                if (msc_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
+                                              where, &data))
+                        return -1;
+
+                if (size == 1)
+                        data = (data & ~(0xff << ((where & 3) << 3))) |
+                                (val << ((where & 3) << 3));
+                else if (size == 2)
+                        data = (data & ~(0xffff << ((where & 3) << 3))) |
+                                (val << ((where & 3) << 3));
+        }
+
+        if (msc_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+                                       &data))
+                return -1;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops msc_pci_ops = {
+        .read = msc_pcibios_read,
+        .write = msc_pcibios_write
+};