/* * Sonics Silicon Backplane * Broadcom PCI-core driver * * Copyright 2005, Broadcom Corporation * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de> * * Licensed under the GNU/GPL. See COPYING for details. */ #include <linux/ssb/ssb.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/ssb/ssb_embedded.h> #include "ssb_private.h" static inline u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset) { return ssb_read32(pc->dev, offset); } static inline void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value) { ssb_write32(pc->dev, offset, value); } static inline u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset) { return ssb_read16(pc->dev, offset); } static inline void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value) { ssb_write16(pc->dev, offset, value); } /************************************************** * Code for hostmode operation. **************************************************/ #ifdef CONFIG_SSB_PCICORE_HOSTMODE #include <asm/paccess.h> /* Probe a 32bit value on the bus and catch bus exceptions. * Returns nonzero on a bus exception. * This is MIPS specific */ #define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr))) /* Assume one-hot slot wiring */ #define SSB_PCI_SLOT_MAX 16 /* Global lock is OK, as we won't have more than one extpci anyway. */ static DEFINE_SPINLOCK(cfgspace_lock); /* Core to access the external PCI config space. Can only have one. */ static struct ssb_pcicore *extpci_core; static u32 get_cfgspace_addr(struct ssb_pcicore *pc, unsigned int bus, unsigned int dev, unsigned int func, unsigned int off) { u32 addr = 0; u32 tmp; /* We do only have one cardbus device behind the bridge. */ if (pc->cardbusmode && (dev >= 1)) goto out; if (bus == 0) { /* Type 0 transaction */ if (unlikely(dev >= SSB_PCI_SLOT_MAX)) goto out; /* Slide the window */ tmp = SSB_PCICORE_SBTOPCI_CFG0; tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK); pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp); /* Calculate the address */ addr = SSB_PCI_CFG; addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK); addr |= (func << 8); addr |= (off & ~3); } else { /* Type 1 transaction */ pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, SSB_PCICORE_SBTOPCI_CFG1); /* Calculate the address */ addr = SSB_PCI_CFG; addr |= (bus << 16); addr |= (dev << 11); addr |= (func << 8); addr |= (off & ~3); } out: return addr; } static int ssb_extpci_read_config(struct ssb_pcicore *pc, unsigned int bus, unsigned int dev, unsigned int func, unsigned int off, void *buf, int len) { int err = -EINVAL; u32 addr, val; void __iomem *mmio; SSB_WARN_ON(!pc->hostmode); if (unlikely(len != 1 && len != 2 && len != 4)) goto out; addr = get_cfgspace_addr(pc, bus, dev, func, off); if (unlikely(!addr)) goto out; err = -ENOMEM; mmio = ioremap_nocache(addr, len); if (!mmio) goto out; if (mips_busprobe32(val, mmio)) { val = 0xffffffff; goto unmap; } val = readl(mmio); val >>= (8 * (off & 3)); switch (len) { case 1: *((u8 *)buf) = (u8)val; break; case 2: *((u16 *)buf) = (u16)val; break; case 4: *((u32 *)buf) = (u32)val; break; } err = 0; unmap: iounmap(mmio); out: return err; } static int ssb_extpci_write_config(struct ssb_pcicore *pc, unsigned int bus, unsigned int dev, unsigned int func, unsigned int off, const void *buf, int len) { int err = -EINVAL; u32 addr, val = 0; void __iomem *mmio; SSB_WARN_ON(!pc->hostmode); if (unlikely(len != 1 && len != 2 && len != 4)) goto out; addr = get_cfgspace_addr(pc, bus, dev, func, off); if (unlikely(!addr)) goto out; err = -ENOMEM; mmio = ioremap_nocache(addr, len); if (!mmio) goto out; if (mips_busprobe32(val, mmio)) { val = 0xffffffff; goto unmap; } switch (len) { case 1: val = readl(mmio); val &= ~(0xFF << (8 * (off & 3))); val |= *((const u8 *)buf) << (8 * (off & 3)); break; case 2: val = readl(mmio); val &= ~(0xFFFF << (8 * (off & 3))); val |= *((const u16 *)buf) << (8 * (off & 3)); break; case 4: val = *((const u32 *)buf); break; } writel(val, mmio); err = 0; unmap: iounmap(mmio); out: return err; } static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn, int reg, int size, u32 *val) { unsigned long flags; int err; spin_lock_irqsave(&cfgspace_lock, flags); err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), reg, val, size); spin_unlock_irqrestore(&cfgspace_lock, flags); return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL; } static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn, int reg, int size, u32 val) { unsigned long flags; int err; spin_lock_irqsave(&cfgspace_lock, flags); err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), reg, &val, size); spin_unlock_irqrestore(&cfgspace_lock, flags); return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL; } static struct pci_ops ssb_pcicore_pciops = { .read = ssb_pcicore_read_config, .write = ssb_pcicore_write_config, }; static struct resource ssb_pcicore_mem_resource = { .name = "SSB PCIcore external memory", .start = SSB_PCI_DMA, .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1, .flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED, }; static struct resource ssb_pcicore_io_resource = { .name = "SSB PCIcore external I/O", .start = 0x100, .end = 0x7FF, .flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED, }; static struct pci_controller ssb_pcicore_controller = { .pci_ops = &ssb_pcicore_pciops, .io_resource = &ssb_pcicore_io_resource, .mem_resource = &ssb_pcicore_mem_resource, .mem_offset = 0x24000000, }; static u32 ssb_pcicore_pcibus_iobase = 0x100; static u32 ssb_pcicore_pcibus_membase = SSB_PCI_DMA; /* This function is called when doing a pci_enable_device(). * We must first check if the device is a device on the PCI-core bridge. */ int ssb_pcicore_plat_dev_init(struct pci_dev *d) { struct resource *res; int pos, size; u32 *base; if (d->bus->ops != &ssb_pcicore_pciops) { /* This is not a device on the PCI-core bridge. */ return -ENODEV; } ssb_printk(KERN_INFO "PCI: Fixing up device %s\n", pci_name(d)); /* Fix up resource bases */ for (pos = 0; pos < 6; pos++) { res = &d->resource[pos]; if (res->flags & IORESOURCE_IO) base = &ssb_pcicore_pcibus_iobase; else base = &ssb_pcicore_pcibus_membase; res->flags |= IORESOURCE_PCI_FIXED; if (res->end) { size = res->end - res->start + 1; if (*base & (size - 1)) *base = (*base + size) & ~(size - 1); res->start = *base; res->end = res->start + size - 1; *base += size; pci_write_config_dword(d, PCI_BASE_ADDRESS_0 + (pos << 2), res->start); } /* Fix up PCI bridge BAR0 only */ if (d->bus->number == 0 && PCI_SLOT(d->devfn) == 0) break; } /* Fix up interrupt lines */ d->irq = ssb_mips_irq(extpci_core->dev) + 2; pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq); return 0; } /* Early PCI fixup for a device on the PCI-core bridge. */ static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev) { u8 lat; if (dev->bus->ops != &ssb_pcicore_pciops) { /* This is not a device on the PCI-core bridge. */ return; } if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0) return; ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev)); /* Enable PCI bridge bus mastering and memory space */ pci_set_master(dev); if (pcibios_enable_device(dev, ~0) < 0) { ssb_printk(KERN_ERR "PCI: SSB bridge enable failed\n"); return; } /* Enable PCI bridge BAR1 prefetch and burst */ pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3); /* Make sure our latency is high enough to handle the devices behind us */ lat = 168; ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n", pci_name(dev), lat); pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); } DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge); /* PCI device IRQ mapping. */ int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { if (dev->bus->ops != &ssb_pcicore_pciops) { /* This is not a device on the PCI-core bridge. */ return -ENODEV; } return ssb_mips_irq(extpci_core->dev) + 2; } static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc) { u32 val; if (WARN_ON(extpci_core)) return; extpci_core = pc; ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n"); /* Reset devices on the external PCI bus */ val = SSB_PCICORE_CTL_RST_OE; val |= SSB_PCICORE_CTL_CLK_OE; pcicore_write32(pc, SSB_PCICORE_CTL, val); val |= SSB_PCICORE_CTL_CLK; /* Clock on */ pcicore_write32(pc, SSB_PCICORE_CTL, val); udelay(150); /* Assertion time demanded by the PCI standard */ val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */ pcicore_write32(pc, SSB_PCICORE_CTL, val); val = SSB_PCICORE_ARBCTL_INTERN; pcicore_write32(pc, SSB_PCICORE_ARBCTL, val); udelay(1); /* Assertion time demanded by the PCI standard */ if (pc->dev->bus->has_cardbus_slot) { ssb_dprintk(KERN_INFO PFX "CardBus slot detected\n"); pc->cardbusmode = 1; /* GPIO 1 resets the bridge */ ssb_gpio_out(pc->dev->bus, 1, 1); ssb_gpio_outen(pc->dev->bus, 1, 1); pcicore_write16(pc, SSB_PCICORE_SPROM(0), pcicore_read16(pc, SSB_PCICORE_SPROM(0)) | 0x0400); } /* 64MB I/O window */ pcicore_write32(pc, SSB_PCICORE_SBTOPCI0, SSB_PCICORE_SBTOPCI_IO); /* 64MB config space */ pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, SSB_PCICORE_SBTOPCI_CFG0); /* 1GB memory window */ pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA); /* Enable PCI bridge BAR0 prefetch and burst */ val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY; ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2); /* Clear error conditions */ val = 0; ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2); /* Enable PCI interrupts */ pcicore_write32(pc, SSB_PCICORE_IMASK, SSB_PCICORE_IMASK_INTA); /* Ok, ready to run, register it to the system. * The following needs change, if we want to port hostmode * to non-MIPS platform. */ ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000); set_io_port_base(ssb_pcicore_controller.io_map_base); /* Give some time to the PCI controller to configure itself with the new * values. Not waiting at this point causes crashes of the machine. */ mdelay(10); register_pci_controller(&ssb_pcicore_controller); } static int pcicore_is_in_hostmode(struct ssb_pcicore *pc) { struct ssb_bus *bus = pc->dev->bus; u16 chipid_top; u32 tmp; chipid_top = (bus->chip_id & 0xFF00); if (chipid_top != 0x4700 && chipid_top != 0x5300) return 0; if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI) return 0; /* The 200-pin BCM4712 package does not bond out PCI. Even when * PCI is bonded out, some boards may leave the pins floating. */ if (bus->chip_id == 0x4712) { if (bus->chip_package == SSB_CHIPPACK_BCM4712S) return 0; if (bus->chip_package == SSB_CHIPPACK_BCM4712M) return 0; } if (bus->chip_id == 0x5350) return 0; return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE))); } #endif /* CONFIG_SSB_PCICORE_HOSTMODE */ /************************************************** * Generic and Clientmode operation code. **************************************************/ static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc) { /* Disable PCI interrupts. */ ssb_write32(pc->dev, SSB_INTVEC, 0); } void ssb_pcicore_init(struct ssb_pcicore *pc) { struct ssb_device *dev = pc->dev; struct ssb_bus *bus; if (!dev) return; bus = dev->bus; if (!ssb_device_is_enabled(dev)) ssb_device_enable(dev, 0); #ifdef CONFIG_SSB_PCICORE_HOSTMODE pc->hostmode = pcicore_is_in_hostmode(pc); if (pc->hostmode) ssb_pcicore_init_hostmode(pc); #endif /* CONFIG_SSB_PCICORE_HOSTMODE */ if (!pc->hostmode) ssb_pcicore_init_clientmode(pc); } static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address) { pcicore_write32(pc, 0x130, address); return pcicore_read32(pc, 0x134); } static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data) { pcicore_write32(pc, 0x130, address); pcicore_write32(pc, 0x134, data); } static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device, u8 address, u16 data) { const u16 mdio_control = 0x128; const u16 mdio_data = 0x12C; u32 v; int i; v = 0x80; /* Enable Preamble Sequence */ v |= 0x2; /* MDIO Clock Divisor */ pcicore_write32(pc, mdio_control, v); v = (1 << 30); /* Start of Transaction */ v |= (1 << 28); /* Write Transaction */ v |= (1 << 17); /* Turnaround */ v |= (u32)device << 22; v |= (u32)address << 18; v |= data; pcicore_write32(pc, mdio_data, v); /* Wait for the device to complete the transaction */ udelay(10); for (i = 0; i < 10; i++) { v = pcicore_read32(pc, mdio_control); if (v & 0x100 /* Trans complete */) break; msleep(1); } pcicore_write32(pc, mdio_control, 0); } static void ssb_broadcast_value(struct ssb_device *dev, u32 address, u32 data) { /* This is used for both, PCI and ChipCommon core, so be careful. */ BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR); BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA); ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address); ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */ ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data); ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */ } static void ssb_commit_settings(struct ssb_bus *bus) { struct ssb_device *dev; dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev; if (WARN_ON(!dev)) return; /* This forces an update of the cached registers. */ ssb_broadcast_value(dev, 0xFD8, 0); } int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc, struct ssb_device *dev) { struct ssb_device *pdev = pc->dev; struct ssb_bus *bus; int err = 0; u32 tmp; if (dev->bus->bustype != SSB_BUSTYPE_PCI) { /* This SSB device is not on a PCI host-bus. So the IRQs are * not routed through the PCI core. * So we must not enable routing through the PCI core. */ goto out; } if (!pdev) goto out; bus = pdev->bus; might_sleep_if(pdev->id.coreid != SSB_DEV_PCI); /* Enable interrupts for this device. */ if (bus->host_pci && ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE))) { u32 coremask; /* Calculate the "coremask" for the device. */ coremask = (1 << dev->core_index); err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp); if (err) goto out; tmp |= coremask << 8; err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp); if (err) goto out; } else { u32 intvec; intvec = ssb_read32(pdev, SSB_INTVEC); tmp = ssb_read32(dev, SSB_TPSFLAG); tmp &= SSB_TPSFLAG_BPFLAG; intvec |= (1 << tmp); ssb_write32(pdev, SSB_INTVEC, intvec); } /* Setup PCIcore operation. */ if (pc->setup_done) goto out; if (pdev->id.coreid == SSB_DEV_PCI) { tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2); tmp |= SSB_PCICORE_SBTOPCI_PREF; tmp |= SSB_PCICORE_SBTOPCI_BURST; pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp); if (pdev->id.revision < 5) { tmp = ssb_read32(pdev, SSB_IMCFGLO); tmp &= ~SSB_IMCFGLO_SERTO; tmp |= 2; tmp &= ~SSB_IMCFGLO_REQTO; tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT; ssb_write32(pdev, SSB_IMCFGLO, tmp); ssb_commit_settings(bus); } else if (pdev->id.revision >= 11) { tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2); tmp |= SSB_PCICORE_SBTOPCI_MRM; pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp); } } else { WARN_ON(pdev->id.coreid != SSB_DEV_PCIE); //TODO: Better make defines for all these magic PCIE values. if ((pdev->id.revision == 0) || (pdev->id.revision == 1)) { /* TLP Workaround register. */ tmp = ssb_pcie_read(pc, 0x4); tmp |= 0x8; ssb_pcie_write(pc, 0x4, tmp); } if (pdev->id.revision == 0) { const u8 serdes_rx_device = 0x1F; ssb_pcie_mdio_write(pc, serdes_rx_device, 2 /* Timer */, 0x8128); ssb_pcie_mdio_write(pc, serdes_rx_device, 6 /* CDR */, 0x0100); ssb_pcie_mdio_write(pc, serdes_rx_device, 7 /* CDR BW */, 0x1466); } else if (pdev->id.revision == 1) { /* DLLP Link Control register. */ tmp = ssb_pcie_read(pc, 0x100); tmp |= 0x40; ssb_pcie_write(pc, 0x100, tmp); } } pc->setup_done = 1; out: return err; } EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);