diff options
Diffstat (limited to 'arch/arm/mach-kirkwood/pcie.c')
| -rw-r--r-- | arch/arm/mach-kirkwood/pcie.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c new file mode 100644 index 00000000..ca294ff6 --- /dev/null +++ b/arch/arm/mach-kirkwood/pcie.c @@ -0,0 +1,282 @@ +/* + * arch/arm/mach-kirkwood/pcie.c + * + * PCIe functions for Marvell Kirkwood SoCs + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/mbus.h> +#include <asm/irq.h> +#include <asm/mach/pci.h> +#include <plat/pcie.h> +#include <mach/bridge-regs.h> +#include "common.h" + +void kirkwood_enable_pcie(void) +{ + u32 curr = readl(CLOCK_GATING_CTRL); + if (!(curr & CGC_PEX0)) + writel(curr | CGC_PEX0, CLOCK_GATING_CTRL); +} + +void __init kirkwood_pcie_id(u32 *dev, u32 *rev) +{ + kirkwood_enable_pcie(); + *dev = orion_pcie_dev_id((void __iomem *)PCIE_VIRT_BASE); + *rev = orion_pcie_rev((void __iomem *)PCIE_VIRT_BASE); +} + +struct pcie_port { + u8 root_bus_nr; + void __iomem *base; + spinlock_t conf_lock; + int irq; + struct resource res[2]; +}; + +static int pcie_port_map[2]; +static int num_pcie_ports; + +static inline struct pcie_port *bus_to_port(struct pci_bus *bus) +{ + struct pci_sys_data *sys = bus->sysdata; + return sys->private_data; +} + +static int pcie_valid_config(struct pcie_port *pp, int bus, int dev) +{ + /* + * Don't go out when trying to access -- + * 1. nonexisting device on local bus + * 2. where there's no device connected (no link) + */ + if (bus == pp->root_bus_nr && dev == 0) + return 1; + + if (!orion_pcie_link_up(pp->base)) + return 0; + + if (bus == pp->root_bus_nr && dev != 1) + return 0; + + return 1; +} + + +/* + * PCIe config cycles are done by programming the PCIE_CONF_ADDR register + * and then reading the PCIE_CONF_DATA register. Need to make sure these + * transactions are atomic. + */ + +static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, + int size, u32 *val) +{ + struct pcie_port *pp = bus_to_port(bus); + unsigned long flags; + int ret; + + if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) { + *val = 0xffffffff; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + spin_lock_irqsave(&pp->conf_lock, flags); + ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val); + spin_unlock_irqrestore(&pp->conf_lock, flags); + + return ret; +} + +static int pcie_wr_conf(struct pci_bus *bus, u32 devfn, + int where, int size, u32 val) +{ + struct pcie_port *pp = bus_to_port(bus); + unsigned long flags; + int ret; + + if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + spin_lock_irqsave(&pp->conf_lock, flags); + ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val); + spin_unlock_irqrestore(&pp->conf_lock, flags); + + return ret; +} + +static struct pci_ops pcie_ops = { + .read = pcie_rd_conf, + .write = pcie_wr_conf, +}; + +static void __init pcie0_ioresources_init(struct pcie_port *pp) +{ + pp->base = (void __iomem *)PCIE_VIRT_BASE; + pp->irq = IRQ_KIRKWOOD_PCIE; + + /* + * IORESOURCE_IO + */ + pp->res[0].name = "PCIe 0 I/O Space"; + pp->res[0].start = KIRKWOOD_PCIE_IO_BUS_BASE; + pp->res[0].end = pp->res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1; + pp->res[0].flags = IORESOURCE_IO; + + /* + * IORESOURCE_MEM + */ + pp->res[1].name = "PCIe 0 MEM"; + pp->res[1].start = KIRKWOOD_PCIE_MEM_PHYS_BASE; + pp->res[1].end = pp->res[1].start + KIRKWOOD_PCIE_MEM_SIZE - 1; + pp->res[1].flags = IORESOURCE_MEM; +} + +static void __init pcie1_ioresources_init(struct pcie_port *pp) +{ + pp->base = (void __iomem *)PCIE1_VIRT_BASE; + pp->irq = IRQ_KIRKWOOD_PCIE1; + + /* + * IORESOURCE_IO + */ + pp->res[0].name = "PCIe 1 I/O Space"; + pp->res[0].start = KIRKWOOD_PCIE1_IO_BUS_BASE; + pp->res[0].end = pp->res[0].start + KIRKWOOD_PCIE1_IO_SIZE - 1; + pp->res[0].flags = IORESOURCE_IO; + + /* + * IORESOURCE_MEM + */ + pp->res[1].name = "PCIe 1 MEM"; + pp->res[1].start = KIRKWOOD_PCIE1_MEM_PHYS_BASE; + pp->res[1].end = pp->res[1].start + KIRKWOOD_PCIE1_MEM_SIZE - 1; + pp->res[1].flags = IORESOURCE_MEM; +} + +static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys) +{ + extern unsigned int kirkwood_clk_ctrl; + struct pcie_port *pp; + int index; + + if (nr >= num_pcie_ports) + return 0; + + index = pcie_port_map[nr]; + printk(KERN_INFO "PCI: bus%d uses PCIe port %d\n", sys->busnr, index); + + pp = kzalloc(sizeof(*pp), GFP_KERNEL); + if (!pp) + panic("PCIe: failed to allocate pcie_port data"); + sys->private_data = pp; + pp->root_bus_nr = sys->busnr; + spin_lock_init(&pp->conf_lock); + + switch (index) { + case 0: + kirkwood_clk_ctrl |= CGC_PEX0; + pcie0_ioresources_init(pp); + break; + case 1: + kirkwood_clk_ctrl |= CGC_PEX1; + pcie1_ioresources_init(pp); + break; + default: + panic("PCIe setup: invalid controller %d", index); + } + + if (request_resource(&ioport_resource, &pp->res[0])) + panic("Request PCIe%d IO resource failed\n", index); + if (request_resource(&iomem_resource, &pp->res[1])) + panic("Request PCIe%d Memory resource failed\n", index); + + sys->resource[0] = &pp->res[0]; + sys->resource[1] = &pp->res[1]; + sys->resource[2] = NULL; + sys->io_offset = 0; + + /* + * Generic PCIe unit setup. + */ + orion_pcie_set_local_bus_nr(pp->base, sys->busnr); + + orion_pcie_setup(pp->base, &kirkwood_mbus_dram_info); + + return 1; +} + +static void __devinit rc_pci_fixup(struct pci_dev *dev) +{ + /* + * Prevent enumeration of root complex. + */ + if (dev->bus->parent == NULL && dev->devfn == 0) { + int i; + + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { + dev->resource[i].start = 0; + dev->resource[i].end = 0; + dev->resource[i].flags = 0; + } + } +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup); + +static struct pci_bus __init * +kirkwood_pcie_scan_bus(int nr, struct pci_sys_data *sys) +{ + struct pci_bus *bus; + + if (nr < num_pcie_ports) { + bus = pci_scan_bus(sys->busnr, &pcie_ops, sys); + } else { + bus = NULL; + BUG(); + } + + return bus; +} + +static int __init kirkwood_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin) +{ + struct pcie_port *pp = bus_to_port(dev->bus); + + return pp->irq; +} + +static struct hw_pci kirkwood_pci __initdata = { + .swizzle = pci_std_swizzle, + .setup = kirkwood_pcie_setup, + .scan = kirkwood_pcie_scan_bus, + .map_irq = kirkwood_pcie_map_irq, +}; + +static void __init add_pcie_port(int index, unsigned long base) +{ + printk(KERN_INFO "Kirkwood PCIe port %d: ", index); + + if (orion_pcie_link_up((void __iomem *)base)) { + printk(KERN_INFO "link up\n"); + pcie_port_map[num_pcie_ports++] = index; + } else + printk(KERN_INFO "link down, ignoring\n"); +} + +void __init kirkwood_pcie_init(unsigned int portmask) +{ + if (portmask & KW_PCIE0) + add_pcie_port(0, PCIE_VIRT_BASE); + + if (portmask & KW_PCIE1) + add_pcie_port(1, PCIE1_VIRT_BASE); + + kirkwood_pci.nr_controllers = num_pcie_ports; + pci_common_init(&kirkwood_pci); +} |