diff options
Diffstat (limited to 'arch/arm/mach-orion5x/pci.c')
| -rw-r--r-- | arch/arm/mach-orion5x/pci.c | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/arch/arm/mach-orion5x/pci.c b/arch/arm/mach-orion5x/pci.c new file mode 100644 index 00000000000..27b4afc8f48 --- /dev/null +++ b/arch/arm/mach-orion5x/pci.c @@ -0,0 +1,559 @@ +/* + * arch/arm/mach-orion5x/pci.c + * + * PCI and PCIe functions for Marvell Orion System On Chip + * + * Maintainer: Tzachi Perelstein <tzachi@marvell.com> + * + * 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/mbus.h> +#include <asm/mach/pci.h> +#include <asm/plat-orion/pcie.h> +#include "common.h" + +/***************************************************************************** + * Orion has one PCIe controller and one PCI controller. + * + * Note1: The local PCIe bus number is '0'. The local PCI bus number + * follows the scanned PCIe bridged busses, if any. + * + * Note2: It is possible for PCI/PCIe agents to access many subsystem's + * space, by configuring BARs and Address Decode Windows, e.g. flashes on + * device bus, Orion registers, etc. However this code only enable the + * access to DDR banks. + ****************************************************************************/ + + +/***************************************************************************** + * PCIe controller + ****************************************************************************/ +#define PCIE_BASE ((void __iomem *)ORION5X_PCIE_VIRT_BASE) + +void __init orion5x_pcie_id(u32 *dev, u32 *rev) +{ + *dev = orion_pcie_dev_id(PCIE_BASE); + *rev = orion_pcie_rev(PCIE_BASE); +} + +int orion5x_pcie_local_bus_nr(void) +{ + return orion_pcie_get_local_bus_nr(PCIE_BASE); +} + +static int pcie_valid_config(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 == 0 && dev == 0) + return 1; + + if (!orion_pcie_link_up(PCIE_BASE)) + return 0; + + if (bus == 0 && 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 DEFINE_SPINLOCK(orion5x_pcie_lock); + +static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, + int size, u32 *val) +{ + unsigned long flags; + int ret; + + if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) { + *val = 0xffffffff; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + spin_lock_irqsave(&orion5x_pcie_lock, flags); + ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val); + spin_unlock_irqrestore(&orion5x_pcie_lock, flags); + + return ret; +} + +static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn, + int where, int size, u32 *val) +{ + int ret; + + if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) { + *val = 0xffffffff; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + /* + * We only support access to the non-extended configuration + * space when using the WA access method (or we would have to + * sacrifice 256M of CPU virtual address space.) + */ + if (where >= 0x100) { + *val = 0xffffffff; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + ret = orion_pcie_rd_conf_wa((void __iomem *)ORION5X_PCIE_WA_VIRT_BASE, + bus, devfn, where, size, val); + + return ret; +} + +static int pcie_wr_conf(struct pci_bus *bus, u32 devfn, + int where, int size, u32 val) +{ + unsigned long flags; + int ret; + + if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + spin_lock_irqsave(&orion5x_pcie_lock, flags); + ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val); + spin_unlock_irqrestore(&orion5x_pcie_lock, flags); + + return ret; +} + +static struct pci_ops pcie_ops = { + .read = pcie_rd_conf, + .write = pcie_wr_conf, +}; + + +static int __init pcie_setup(struct pci_sys_data *sys) +{ + struct resource *res; + int dev; + + /* + * Generic PCIe unit setup. + */ + orion_pcie_setup(PCIE_BASE, &orion5x_mbus_dram_info); + + /* + * Check whether to apply Orion-1/Orion-NAS PCIe config + * read transaction workaround. + */ + dev = orion_pcie_dev_id(PCIE_BASE); + if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) { + printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config " + "read transaction workaround\n"); + pcie_ops.read = pcie_rd_conf_wa; + } + + /* + * Request resources. + */ + res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL); + if (!res) + panic("pcie_setup unable to alloc resources"); + + /* + * IORESOURCE_IO + */ + res[0].name = "PCIe I/O Space"; + res[0].flags = IORESOURCE_IO; + res[0].start = ORION5X_PCIE_IO_BUS_BASE; + res[0].end = res[0].start + ORION5X_PCIE_IO_SIZE - 1; + if (request_resource(&ioport_resource, &res[0])) + panic("Request PCIe IO resource failed\n"); + sys->resource[0] = &res[0]; + + /* + * IORESOURCE_MEM + */ + res[1].name = "PCIe Memory Space"; + res[1].flags = IORESOURCE_MEM; + res[1].start = ORION5X_PCIE_MEM_PHYS_BASE; + res[1].end = res[1].start + ORION5X_PCIE_MEM_SIZE - 1; + if (request_resource(&iomem_resource, &res[1])) + panic("Request PCIe Memory resource failed\n"); + sys->resource[1] = &res[1]; + + sys->resource[2] = NULL; + sys->io_offset = 0; + + return 1; +} + +/***************************************************************************** + * PCI controller + ****************************************************************************/ +#define PCI_MODE ORION5X_PCI_REG(0xd00) +#define PCI_CMD ORION5X_PCI_REG(0xc00) +#define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14) +#define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78) +#define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c) + +/* + * PCI_MODE bits + */ +#define PCI_MODE_64BIT (1 << 2) +#define PCI_MODE_PCIX ((1 << 4) | (1 << 5)) + +/* + * PCI_CMD bits + */ +#define PCI_CMD_HOST_REORDER (1 << 29) + +/* + * PCI_P2P_CONF bits + */ +#define PCI_P2P_BUS_OFFS 16 +#define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS) +#define PCI_P2P_DEV_OFFS 24 +#define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS) + +/* + * PCI_CONF_ADDR bits + */ +#define PCI_CONF_REG(reg) ((reg) & 0xfc) +#define PCI_CONF_FUNC(func) (((func) & 0x3) << 8) +#define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11) +#define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16) +#define PCI_CONF_ADDR_EN (1 << 31) + +/* + * Internal configuration space + */ +#define PCI_CONF_FUNC_STAT_CMD 0 +#define PCI_CONF_REG_STAT_CMD 4 +#define PCIX_STAT 0x64 +#define PCIX_STAT_BUS_OFFS 8 +#define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS) + +/* + * PCI Address Decode Windows registers + */ +#define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \ + ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \ + ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \ + ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0) +#define PCI_BAR_REMAP_DDR_CS(n) (((n) ==0) ? ORION5X_PCI_REG(0xc48) : \ + ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \ + ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \ + ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0) +#define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c) +#define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c) + +/* + * PCI configuration helpers for BAR settings + */ +#define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1) +#define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10) +#define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14) + +/* + * PCI config cycles are done by programming the PCI_CONF_ADDR register + * and then reading the PCI_CONF_DATA register. Need to make sure these + * transactions are atomic. + */ +static DEFINE_SPINLOCK(orion5x_pci_lock); + +int orion5x_pci_local_bus_nr(void) +{ + u32 conf = orion5x_read(PCI_P2P_CONF); + return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS); +} + +static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func, + u32 where, u32 size, u32 *val) +{ + unsigned long flags; + spin_lock_irqsave(&orion5x_pci_lock, flags); + + orion5x_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) | + PCI_CONF_DEV(dev) | PCI_CONF_REG(where) | + PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN); + + *val = orion5x_read(PCI_CONF_DATA); + + if (size == 1) + *val = (*val >> (8*(where & 0x3))) & 0xff; + else if (size == 2) + *val = (*val >> (8*(where & 0x3))) & 0xffff; + + spin_unlock_irqrestore(&orion5x_pci_lock, flags); + + return PCIBIOS_SUCCESSFUL; +} + +static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func, + u32 where, u32 size, u32 val) +{ + unsigned long flags; + int ret = PCIBIOS_SUCCESSFUL; + + spin_lock_irqsave(&orion5x_pci_lock, flags); + + orion5x_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) | + PCI_CONF_DEV(dev) | PCI_CONF_REG(where) | + PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN); + + if (size == 4) { + __raw_writel(val, PCI_CONF_DATA); + } else if (size == 2) { + __raw_writew(val, PCI_CONF_DATA + (where & 0x3)); + } else if (size == 1) { + __raw_writeb(val, PCI_CONF_DATA + (where & 0x3)); + } else { + ret = PCIBIOS_BAD_REGISTER_NUMBER; + } + + spin_unlock_irqrestore(&orion5x_pci_lock, flags); + + return ret; +} + +static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn, + int where, int size, u32 *val) +{ + /* + * Don't go out for local device + */ + if (bus->number == orion5x_pci_local_bus_nr() && + PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0) { + *val = 0xffffffff; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn), + PCI_FUNC(devfn), where, size, val); +} + +static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn, + int where, int size, u32 val) +{ + if (bus->number == orion5x_pci_local_bus_nr() && + PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn), + PCI_FUNC(devfn), where, size, val); +} + +static struct pci_ops pci_ops = { + .read = orion5x_pci_rd_conf, + .write = orion5x_pci_wr_conf, +}; + +static void __init orion5x_pci_set_bus_nr(int nr) +{ + u32 p2p = orion5x_read(PCI_P2P_CONF); + + if (orion5x_read(PCI_MODE) & PCI_MODE_PCIX) { + /* + * PCI-X mode + */ + u32 pcix_status, bus, dev; + bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS; + dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS; + orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status); + pcix_status &= ~PCIX_STAT_BUS_MASK; + pcix_status |= (nr << PCIX_STAT_BUS_OFFS); + orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status); + } else { + /* + * PCI Conventional mode + */ + p2p &= ~PCI_P2P_BUS_MASK; + p2p |= (nr << PCI_P2P_BUS_OFFS); + orion5x_write(PCI_P2P_CONF, p2p); + } +} + +static void __init orion5x_pci_master_slave_enable(void) +{ + int bus_nr, func, reg; + u32 val; + + bus_nr = orion5x_pci_local_bus_nr(); + func = PCI_CONF_FUNC_STAT_CMD; + reg = PCI_CONF_REG_STAT_CMD; + orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val); + val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); + orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7); +} + +static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram) +{ + u32 win_enable; + int bus; + int i; + + /* + * First, disable windows. + */ + win_enable = 0xffffffff; + orion5x_write(PCI_BAR_ENABLE, win_enable); + + /* + * Setup windows for DDR banks. + */ + bus = orion5x_pci_local_bus_nr(); + + for (i = 0; i < dram->num_cs; i++) { + struct mbus_dram_window *cs = dram->cs + i; + u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index); + u32 reg; + u32 val; + + /* + * Write DRAM bank base address register. + */ + reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index); + orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val); + val = (cs->base & 0xfffff000) | (val & 0xfff); + orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val); + + /* + * Write DRAM bank size register. + */ + reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index); + orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0); + orion5x_write(PCI_BAR_SIZE_DDR_CS(cs->cs_index), + (cs->size - 1) & 0xfffff000); + orion5x_write(PCI_BAR_REMAP_DDR_CS(cs->cs_index), + cs->base & 0xfffff000); + + /* + * Enable decode window for this chip select. + */ + win_enable &= ~(1 << cs->cs_index); + } + + /* + * Re-enable decode windows. + */ + orion5x_write(PCI_BAR_ENABLE, win_enable); + + /* + * Disable automatic update of address remaping when writing to BARs. + */ + orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1); +} + +static int __init pci_setup(struct pci_sys_data *sys) +{ + struct resource *res; + + /* + * Point PCI unit MBUS decode windows to DRAM space. + */ + orion5x_setup_pci_wins(&orion5x_mbus_dram_info); + + /* + * Master + Slave enable + */ + orion5x_pci_master_slave_enable(); + + /* + * Force ordering + */ + orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER); + + /* + * Request resources + */ + res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL); + if (!res) + panic("pci_setup unable to alloc resources"); + + /* + * IORESOURCE_IO + */ + res[0].name = "PCI I/O Space"; + res[0].flags = IORESOURCE_IO; + res[0].start = ORION5X_PCI_IO_BUS_BASE; + res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1; + if (request_resource(&ioport_resource, &res[0])) + panic("Request PCI IO resource failed\n"); + sys->resource[0] = &res[0]; + + /* + * IORESOURCE_MEM + */ + res[1].name = "PCI Memory Space"; + res[1].flags = IORESOURCE_MEM; + res[1].start = ORION5X_PCI_MEM_PHYS_BASE; + res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1; + if (request_resource(&iomem_resource, &res[1])) + panic("Request PCI Memory resource failed\n"); + sys->resource[1] = &res[1]; + + sys->resource[2] = NULL; + sys->io_offset = 0; + + return 1; +} + + +/***************************************************************************** + * General PCIe + PCI + ****************************************************************************/ +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); + +int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys) +{ + int ret = 0; + + if (nr == 0) { + orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr); + ret = pcie_setup(sys); + } else if (nr == 1) { + orion5x_pci_set_bus_nr(sys->busnr); + ret = pci_setup(sys); + } + + return ret; +} + +struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys) +{ + struct pci_bus *bus; + + if (nr == 0) { + bus = pci_scan_bus(sys->busnr, &pcie_ops, sys); + } else if (nr == 1) { + bus = pci_scan_bus(sys->busnr, &pci_ops, sys); + } else { + bus = NULL; + BUG(); + } + + return bus; +} |