diff options
Diffstat (limited to 'drivers/pci/pci_gt64120.c')
| -rw-r--r-- | drivers/pci/pci_gt64120.c | 176 |
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, >->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, >->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, >->regs->pci0_cfgdata); + } else { + val = readl(>->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(>->regs->intrcause); + if (intr & GT_INTRCAUSE_ABORT_BITS) { + /* Error occurred, clear abort bits */ + writel(~GT_INTRCAUSE_ABORT_BITS, >->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 = >->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); +} |