/* * Generic SH7786 PCI-Express operations. * * Copyright (C) 2009 Paul Mundt * * This file is subject to the terms and conditions of the GNU General Public * License v2. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/io.h> #include <linux/spinlock.h> #include "pcie-sh7786.h" enum { PCI_ACCESS_READ, PCI_ACCESS_WRITE, }; static DEFINE_SPINLOCK(sh7786_pcie_lock); static int sh7786_pcie_config_access(unsigned char access_type, struct pci_bus *bus, unsigned int devfn, int where, u32 *data) { struct pci_channel *chan = bus->sysdata; int dev, func; dev = PCI_SLOT(devfn); func = PCI_FUNC(devfn); if (bus->number > 255 || dev > 31 || func > 7) return PCIBIOS_FUNC_NOT_SUPPORTED; if (devfn) return PCIBIOS_DEVICE_NOT_FOUND; /* Set the PIO address */ pci_write_reg(chan, (bus->number << 24) | (dev << 19) | (func << 16) | (where & ~3), SH4A_PCIEPAR); /* Enable the configuration access */ pci_write_reg(chan, (1 << 31), SH4A_PCIEPCTLR); if (access_type == PCI_ACCESS_READ) *data = pci_read_reg(chan, SH4A_PCIEPDR); else pci_write_reg(chan, *data, SH4A_PCIEPDR); /* Check for master and target aborts */ if (pci_read_reg(chan, SH4A_PCIEPCICONF1) & ((1 << 29) | (1 << 28))) return PCIBIOS_DEVICE_NOT_FOUND; return PCIBIOS_SUCCESSFUL; } static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { unsigned long flags; int ret; u32 data; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; spin_lock_irqsave(&sh7786_pcie_lock, flags); ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus, devfn, where, &data); if (ret != PCIBIOS_SUCCESSFUL) goto out; if (size == 1) *val = (data >> ((where & 3) << 3)) & 0xff; else if (size == 2) *val = (data >> ((where & 2) << 3)) & 0xffff; else *val = data; dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x " "where=0x%04x size=%d val=0x%08lx\n", bus->number, devfn, where, size, (unsigned long)*val); out: spin_unlock_irqrestore(&sh7786_pcie_lock, flags); return ret; } static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { unsigned long flags; int shift, ret; u32 data; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; spin_lock_irqsave(&sh7786_pcie_lock, flags); ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus, devfn, where, &data); if (ret != PCIBIOS_SUCCESSFUL) goto out; dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x " "where=0x%04x size=%d val=%08lx\n", bus->number, devfn, where, size, (unsigned long)val); if (size == 1) { shift = (where & 3) << 3; data &= ~(0xff << shift); data |= ((val & 0xff) << shift); } else if (size == 2) { shift = (where & 2) << 3; data &= ~(0xffff << shift); data |= ((val & 0xffff) << shift); } else data = val; ret = sh7786_pcie_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data); out: spin_unlock_irqrestore(&sh7786_pcie_lock, flags); return ret; } struct pci_ops sh7786_pci_ops = { .read = sh7786_pcie_read, .write = sh7786_pcie_write, };