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path: root/drivers/pci/pci_gt64120.c
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Diffstat (limited to 'drivers/pci/pci_gt64120.c')
-rw-r--r--drivers/pci/pci_gt64120.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/pci/pci_gt64120.c b/drivers/pci/pci_gt64120.c
new file mode 100644
index 0000000..4756f142
--- /dev/null
+++ b/drivers/pci/pci_gt64120.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * Based on the Linux implementation.
+ * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
+ * Authors: Carsten Langgaard <carstenl@mips.com>
+ * Maciej W. Rozycki <macro@mips.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <gt64120.h>
+#include <pci.h>
+#include <pci_gt64120.h>
+
+#include <asm/io.h>
+
+#define PCI_ACCESS_READ 0
+#define PCI_ACCESS_WRITE 1
+
+struct gt64120_regs {
+ u8 unused_000[0xc18];
+ u32 intrcause;
+ u8 unused_c1c[0x0dc];
+ u32 pci0_cfgaddr;
+ u32 pci0_cfgdata;
+};
+
+struct gt64120_pci_controller {
+ struct pci_controller hose;
+ struct gt64120_regs *regs;
+};
+
+static inline struct gt64120_pci_controller *
+hose_to_gt64120(struct pci_controller *hose)
+{
+ return container_of(hose, struct gt64120_pci_controller, hose);
+}
+
+#define GT_INTRCAUSE_ABORT_BITS \
+ (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)
+
+static int gt_config_access(struct gt64120_pci_controller *gt,
+ unsigned char access_type, pci_dev_t bdf,
+ int where, u32 *data)
+{
+ unsigned int bus = PCI_BUS(bdf);
+ unsigned int dev = PCI_DEV(bdf);
+ unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf);
+ u32 intr;
+ u32 addr;
+ u32 val;
+
+ if (bus == 0 && dev >= 31) {
+ /* Because of a bug in the galileo (for slot 31). */
+ return -1;
+ }
+
+ if (access_type == PCI_ACCESS_WRITE)
+ debug("PCI WR %02x:%02x.%x reg:%02d data:%08x\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
+
+ /* Clear cause register bits */
+ writel(~GT_INTRCAUSE_ABORT_BITS, &gt->regs->intrcause);
+
+ addr = GT_PCI0_CFGADDR_CONFIGEN_BIT;
+ addr |= bus << GT_PCI0_CFGADDR_BUSNUM_SHF;
+ addr |= devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF;
+ addr |= (where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF;
+
+ /* Setup address */
+ writel(addr, &gt->regs->pci0_cfgaddr);
+
+ if (access_type == PCI_ACCESS_WRITE) {
+ if (bus == 0 && dev == 0) {
+ /*
+ * The Galileo system controller is acting
+ * differently than other devices.
+ */
+ val = *data;
+ } else {
+ val = cpu_to_le32(*data);
+ }
+
+ writel(val, &gt->regs->pci0_cfgdata);
+ } else {
+ val = readl(&gt->regs->pci0_cfgdata);
+
+ if (bus == 0 && dev == 0) {
+ /*
+ * The Galileo system controller is acting
+ * differently than other devices.
+ */
+ *data = val;
+ } else {
+ *data = le32_to_cpu(val);
+ }
+ }
+
+ /* Check for master or target abort */
+ intr = readl(&gt->regs->intrcause);
+ if (intr & GT_INTRCAUSE_ABORT_BITS) {
+ /* Error occurred, clear abort bits */
+ writel(~GT_INTRCAUSE_ABORT_BITS, &gt->regs->intrcause);
+ return -1;
+ }
+
+ if (access_type == PCI_ACCESS_READ)
+ debug("PCI RD %02x:%02x.%x reg:%02d data:%08x\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
+
+ return 0;
+}
+
+static int gt_read_config_dword(struct pci_controller *hose, pci_dev_t dev,
+ int where, u32 *value)
+{
+ struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
+
+ *value = 0xffffffff;
+ return gt_config_access(gt, PCI_ACCESS_READ, dev, where, value);
+}
+
+static int gt_write_config_dword(struct pci_controller *hose, pci_dev_t dev,
+ int where, u32 value)
+{
+ struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
+ u32 data = value;
+
+ return gt_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data);
+}
+
+void gt64120_pci_init(void *regs, unsigned long sys_bus, unsigned long sys_phys,
+ unsigned long sys_size, unsigned long mem_bus,
+ unsigned long mem_phys, unsigned long mem_size,
+ unsigned long io_bus, unsigned long io_phys,
+ unsigned long io_size)
+{
+ static struct gt64120_pci_controller global_gt;
+ struct gt64120_pci_controller *gt;
+ struct pci_controller *hose;
+
+ gt = &global_gt;
+ gt->regs = regs;
+
+ hose = &gt->hose;
+
+ hose->first_busno = 0;
+ hose->last_busno = 0;
+
+ /* System memory space */
+ pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size,
+ PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+ /* PCI memory space */
+ pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size,
+ PCI_REGION_MEM);
+
+ /* PCI I/O space */
+ pci_set_region(&hose->regions[2], io_bus, io_phys, io_size,
+ PCI_REGION_IO);
+
+ hose->region_count = 3;
+
+ pci_set_ops(hose,
+ pci_hose_read_config_byte_via_dword,
+ pci_hose_read_config_word_via_dword,
+ gt_read_config_dword,
+ pci_hose_write_config_byte_via_dword,
+ pci_hose_write_config_word_via_dword,
+ gt_write_config_dword);
+
+ pci_register_hose(hose);
+ hose->last_busno = pci_hose_scan(hose);
+}