diff options
| -rw-r--r-- | target/linux/brcm63xx/files/arch/mips/pci/ops-bcm63xx.c | 288 | ||||
| -rw-r--r-- | target/linux/brcm63xx/files/arch/mips/pci/pci-bcm63xx.c | 44 |
2 files changed, 332 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/files/arch/mips/pci/ops-bcm63xx.c b/target/linux/brcm63xx/files/arch/mips/pci/ops-bcm63xx.c index f8dce9d9a..822ae179b 100644 --- a/target/linux/brcm63xx/files/arch/mips/pci/ops-bcm63xx.c +++ b/target/linux/brcm63xx/files/arch/mips/pci/ops-bcm63xx.c @@ -177,3 +177,291 @@ struct pci_ops bcm63xx_pci_ops = { .read = bcm63xx_pci_read, .write = bcm63xx_pci_write }; + +#ifdef CONFIG_CARDBUS +/* + * emulate configuration read access on a cardbus bridge + */ +#define FAKE_CB_BRIDGE_SLOT 0x1e + +static int fake_cb_bridge_bus_number = -1; + +static struct { + u16 pci_command; + u8 cb_latency; + u8 subordinate_busn; + u8 cardbus_busn; + u8 pci_busn; + int bus_assigned; + u16 bridge_control; + + u32 mem_base0; + u32 mem_limit0; + u32 mem_base1; + u32 mem_limit1; + + u32 io_base0; + u32 io_limit0; + u32 io_base1; + u32 io_limit1; +} fake_cb_bridge_regs; + +static int fake_cb_bridge_read(int where, int size, u32 *val) +{ + unsigned int reg; + u32 data; + + data = 0; + reg = where >> 2; + switch (reg) { + case (PCI_VENDOR_ID >> 2): + case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2): + /* create dummy vendor/device id from our cpu id */ + data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM; + break; + + case (PCI_COMMAND >> 2): + data = (PCI_STATUS_DEVSEL_SLOW << 16); + data |= fake_cb_bridge_regs.pci_command; + break; + + case (PCI_CLASS_REVISION >> 2): + data = (PCI_CLASS_BRIDGE_CARDBUS << 16); + break; + + case (PCI_CACHE_LINE_SIZE >> 2): + data = (PCI_HEADER_TYPE_CARDBUS << 16); + break; + + case (PCI_INTERRUPT_LINE >> 2): + /* bridge control */ + data = (fake_cb_bridge_regs.bridge_control << 16); + /* pin:intA line:0xff */ + data |= (0x1 << 8) | 0xff; + break; + + case (PCI_CB_PRIMARY_BUS >> 2): + data = (fake_cb_bridge_regs.cb_latency << 24); + data |= (fake_cb_bridge_regs.subordinate_busn << 16); + data |= (fake_cb_bridge_regs.cardbus_busn << 8); + data |= fake_cb_bridge_regs.pci_busn; + break; + + case (PCI_CB_MEMORY_BASE_0 >> 2): + data = fake_cb_bridge_regs.mem_base0; + break; + + case (PCI_CB_MEMORY_LIMIT_0 >> 2): + data = fake_cb_bridge_regs.mem_limit0; + break; + + case (PCI_CB_MEMORY_BASE_1 >> 2): + data = fake_cb_bridge_regs.mem_base1; + break; + + case (PCI_CB_MEMORY_LIMIT_1 >> 2): + data = fake_cb_bridge_regs.mem_limit1; + break; + + case (PCI_CB_IO_BASE_0 >> 2): + /* | 1 for 32bits io support */ + data = fake_cb_bridge_regs.io_base0 | 0x1; + break; + + case (PCI_CB_IO_LIMIT_0 >> 2): + data = fake_cb_bridge_regs.io_limit0; + break; + + case (PCI_CB_IO_BASE_1 >> 2): + /* | 1 for 32bits io support */ + data = fake_cb_bridge_regs.io_base1 | 0x1; + break; + + case (PCI_CB_IO_LIMIT_1 >> 2): + data = fake_cb_bridge_regs.io_limit1; + break; + } + + *val = postprocess_read(data, where, size); + return PCIBIOS_SUCCESSFUL; +} + +/* + * emulate configuration write access on a cardbus bridge + */ +static int fake_cb_bridge_write(int where, int size, u32 val) +{ + unsigned int reg; + u32 data, tmp; + int ret; + + ret = fake_cb_bridge_read((where & ~0x3), 4, &data); + if (ret != PCIBIOS_SUCCESSFUL) + return ret; + + data = preprocess_write(data, val, where, size); + + reg = where >> 2; + switch (reg) { + case (PCI_COMMAND >> 2): + fake_cb_bridge_regs.pci_command = (data & 0xffff); + break; + + case (PCI_CB_PRIMARY_BUS >> 2): + fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff; + fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff; + fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff; + fake_cb_bridge_regs.pci_busn = data & 0xff; + if (fake_cb_bridge_regs.cardbus_busn) + fake_cb_bridge_regs.bus_assigned = 1; + break; + + case (PCI_INTERRUPT_LINE >> 2): + tmp = (data >> 16) & 0xffff; + /* disable memory prefetch support */ + tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0; + tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1; + fake_cb_bridge_regs.bridge_control = tmp; + break; + + case (PCI_CB_MEMORY_BASE_0 >> 2): + fake_cb_bridge_regs.mem_base0 = data; + break; + + case (PCI_CB_MEMORY_LIMIT_0 >> 2): + fake_cb_bridge_regs.mem_limit0 = data; + break; + + case (PCI_CB_MEMORY_BASE_1 >> 2): + fake_cb_bridge_regs.mem_base1 = data; + break; + + case (PCI_CB_MEMORY_LIMIT_1 >> 2): + fake_cb_bridge_regs.mem_limit1 = data; + break; + + case (PCI_CB_IO_BASE_0 >> 2): + fake_cb_bridge_regs.io_base0 = data; + break; + + case (PCI_CB_IO_LIMIT_0 >> 2): + fake_cb_bridge_regs.io_limit0 = data; + break; + + case (PCI_CB_IO_BASE_1 >> 2): + fake_cb_bridge_regs.io_base1 = data; + break; + + case (PCI_CB_IO_LIMIT_1 >> 2): + fake_cb_bridge_regs.io_limit1 = data; + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + /* snoop access to slot 0x1e on root bus, we fake a cardbus + * bridge at this location */ + if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) { + fake_cb_bridge_bus_number = bus->number; + return fake_cb_bridge_read(where, size, val); + } + + /* a configuration cycle for the device behind the cardbus + * bridge is actually done as a type 0 cycle on the primary + * bus. This means that only one device can be on the cardbus + * bus */ + if (fake_cb_bridge_regs.bus_assigned && + bus->number == fake_cb_bridge_regs.cardbus_busn && + PCI_SLOT(devfn) == 0) + return bcm63xx_do_cfg_read(0, 0, + PCI_DEVFN(CARDBUS_PCI_IDSEL, 0), + where, size, val); + + return PCIBIOS_DEVICE_NOT_FOUND; +} + +static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) { + fake_cb_bridge_bus_number = bus->number; + return fake_cb_bridge_write(where, size, val); + } + + if (fake_cb_bridge_regs.bus_assigned && + bus->number == fake_cb_bridge_regs.cardbus_busn && + PCI_SLOT(devfn) == 0) + return bcm63xx_do_cfg_write(0, 0, + PCI_DEVFN(CARDBUS_PCI_IDSEL, 0), + where, size, val); + + return PCIBIOS_DEVICE_NOT_FOUND; +} + +struct pci_ops bcm63xx_cb_ops = { + .read = bcm63xx_cb_read, + .write = bcm63xx_cb_write, +}; + +/* + * only one IO window, so it cannot be shared by PCI and cardbus, use + * fixup to choose and detect unhandled configuration + */ +static void bcm63xx_fixup(struct pci_dev *dev) +{ + static int io_window = -1; + int i, found, new_io_window; + u32 val; + + /* look for any io resource */ + found = 0; + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { + if (pci_resource_flags(dev, i) & IORESOURCE_IO) { + found = 1; + break; + } + } + + if (!found) + return; + + /* skip our fake bus with only cardbus bridge on it */ + if (dev->bus->number == fake_cb_bridge_bus_number) + return; + + /* find on which bus the device is */ + if (fake_cb_bridge_regs.bus_assigned && + dev->bus->number == fake_cb_bridge_regs.cardbus_busn && + PCI_SLOT(dev->devfn) == 0) + new_io_window = 1; + else + new_io_window = 0; + + if (new_io_window == io_window) + return; + + if (io_window != -1) { + printk(KERN_ERR "bcm63xx: both PCI and cardbus devices " + "need IO, which hardware cannot do\n"); + return; + } + + printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n", + (new_io_window == 0) ? "PCI" : "cardbus"); + + val = bcm_mpi_readl(MPI_L2PIOREMAP_REG); + if (io_window) + val |= MPI_L2PREMAP_IS_CARDBUS_MASK; + else + val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK; + bcm_mpi_writel(val, MPI_L2PIOREMAP_REG); + + io_window = new_io_window; +} + +DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup); +#endif diff --git a/target/linux/brcm63xx/files/arch/mips/pci/pci-bcm63xx.c b/target/linux/brcm63xx/files/arch/mips/pci/pci-bcm63xx.c index 52bac8e56..601700dfd 100644 --- a/target/linux/brcm63xx/files/arch/mips/pci/pci-bcm63xx.c +++ b/target/linux/brcm63xx/files/arch/mips/pci/pci-bcm63xx.c @@ -28,7 +28,11 @@ static struct resource bcm_pci_mem_resource = { static struct resource bcm_pci_io_resource = { .name = "bcm63xx PCI IO space", .start = BCM_PCI_IO_BASE_PA, +#ifdef CONFIG_CARDBUS + .end = BCM_PCI_IO_HALF_PA, +#else .end = BCM_PCI_IO_END_PA, +#endif .flags = IORESOURCE_IO }; @@ -38,6 +42,33 @@ struct pci_controller bcm63xx_controller = { .mem_resource = &bcm_pci_mem_resource, }; +/* + * We handle cardbus via a fake Cardbus bridge, memory and io spaces + * have to be clearly separated from PCI one since we have different + * memory decoder. + */ +#ifdef CONFIG_CARDBUS +static struct resource bcm_cb_mem_resource = { + .name = "bcm63xx Cardbus memory space", + .start = BCM_CB_MEM_BASE_PA, + .end = BCM_CB_MEM_END_PA, + .flags = IORESOURCE_MEM +}; + +static struct resource bcm_cb_io_resource = { + .name = "bcm63xx Cardbus IO space", + .start = BCM_PCI_IO_HALF_PA + 1, + .end = BCM_PCI_IO_END_PA, + .flags = IORESOURCE_IO +}; + +struct pci_controller bcm63xx_cb_controller = { + .pci_ops = &bcm63xx_cb_ops, + .io_resource = &bcm_cb_io_resource, + .mem_resource = &bcm_cb_mem_resource, +}; +#endif + static u32 bcm63xx_int_cfg_readl(u32 reg) { u32 tmp; @@ -98,8 +129,17 @@ static int __init bcm63xx_pci_init(void) val |= (CARDBUS_PCI_IDSEL << PCMCIA_C1_CBIDSEL_SHIFT); bcm_pcmcia_writel(val, PCMCIA_C1_REG); +#ifdef CONFIG_CARDBUS + /* setup local bus to PCI access (Cardbus memory) */ + val = BCM_CB_MEM_BASE_PA & MPI_L2P_BASE_MASK; + bcm_mpi_writel(val, MPI_L2PMEMBASE2_REG); + bcm_mpi_writel(~(BCM_CB_MEM_SIZE - 1), MPI_L2PMEMRANGE2_REG); + val |= MPI_L2PREMAP_ENABLED_MASK | MPI_L2PREMAP_IS_CARDBUS_MASK; + bcm_mpi_writel(val, MPI_L2PMEMREMAP2_REG); +#else /* disable second access windows */ bcm_mpi_writel(0, MPI_L2PMEMREMAP2_REG); +#endif /* setup local bus to PCI access (IO memory), we have only 1 * IO window for both PCI and cardbus, but it cannot handle @@ -169,6 +209,10 @@ static int __init bcm63xx_pci_init(void) register_pci_controller(&bcm63xx_controller); +#ifdef CONFIG_CARDBUS + register_pci_controller(&bcm63xx_cb_controller); +#endif + /* mark memory space used for IO mapping as reserved */ request_mem_region(BCM_PCI_IO_BASE_PA, BCM_PCI_IO_SIZE, "bcm63xx PCI IO space"); |