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-rw-r--r--arch/mips/pci/ops-bonito64.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-bonito64.c b/arch/mips/pci/ops-bonito64.c
new file mode 100644
index 000000000..4d5fe614f
--- /dev/null
+++ b/arch/mips/pci/ops-bonito64.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
+ * All rights reserved.
+ * Authors: Carsten Langgaard <carstenl@mips.com>
+ * Maciej W. Rozycki <macro@mips.com>
+ *
+ * MIPS boards specific PCI support.
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+#include <asm/mips-boards/bonito64.h>
+
+#define PCI_ACCESS_READ 0
+#define PCI_ACCESS_WRITE 1
+
+#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
+#define ID_SEL_BEGIN 10
+#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
+
+
+static int bonito64_pcibios_config_access(unsigned char access_type,
+ struct pci_bus *bus,
+ unsigned int devfn, int where,
+ u32 * data)
+{
+ u32 busnum = bus->number;
+ u32 addr, type;
+ u32 dummy;
+ void *addrp;
+ int device = PCI_SLOT(devfn);
+ int function = PCI_FUNC(devfn);
+ int reg = where & ~3;
+
+ if (busnum == 0) {
+ /* Type 0 configuration for onboard PCI bus */
+ if (device > MAX_DEV_NUM)
+ return -1;
+
+ addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
+ type = 0;
+ } else {
+ /* Type 1 configuration for offboard PCI bus */
+ addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
+ type = 0x10000;
+ }
+
+ /* Clear aborts */
+ BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;
+
+ BONITO_PCIMAP_CFG = (addr >> 16) | type;
+
+ /* Flush Bonito register block */
+ dummy = BONITO_PCIMAP_CFG;
+ mmiowb();
+
+ addrp = CFG_SPACE_REG(addr & 0xffff);
+ if (access_type == PCI_ACCESS_WRITE) {
+ writel(cpu_to_le32(*data), addrp);
+ /* Wait till done */
+ while (BONITO_PCIMSTAT & 0xF);
+ } else {
+ *data = le32_to_cpu(readl(addrp));
+ }
+
+ /* Detect Master/Target abort */
+ if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
+ BONITO_PCICMD_MTABORT_CLR)) {
+ /* Error occurred */
+
+ /* Clear bits */
+ BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
+ BONITO_PCICMD_MTABORT_CLR);
+
+ 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 bonito64_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 (bonito64_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 bonito64_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 (bonito64_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 (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+ &data))
+ return -1;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops bonito64_pci_ops = {
+ .read = bonito64_pcibios_read,
+ .write = bonito64_pcibios_write
+};