diff options
Diffstat (limited to 'arch/arm/mach-orion5x/pci.c')
| -rw-r--r-- | arch/arm/mach-orion5x/pci.c | 601 |
1 files changed, 601 insertions, 0 deletions
diff --git a/arch/arm/mach-orion5x/pci.c b/arch/arm/mach-orion5x/pci.c new file mode 100644 index 0000000000..3313bc5a63 --- /dev/null +++ b/arch/arm/mach-orion5x/pci.c @@ -0,0 +1,601 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * arch/arm/mach-orion5x/pci.c + * + * PCI and PCIe functions for Marvell Orion System On Chip + * + * Maintainer: Tzachi Perelstein <tzachi@marvell.com> + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/mbus.h> +#include <video/vga.h> +#include <asm/irq.h> +#include <asm/mach/pci.h> +#include <plat/pcie.h> +#include <plat/addr-map.h> +#include "common.h" +#include "orion5x.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 (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); +} + +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(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; + struct resource realio; + int dev; + + /* + * Generic PCIe unit setup. + */ + orion_pcie_setup(PCIE_BASE); + + /* + * 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"); + mvebu_mbus_add_window_by_id(ORION_MBUS_PCIE_WA_TARGET, + ORION_MBUS_PCIE_WA_ATTR, + ORION5X_PCIE_WA_PHYS_BASE, + ORION5X_PCIE_WA_SIZE); + pcie_ops.read = pcie_rd_conf_wa; + } + + realio.start = sys->busnr * SZ_64K; + realio.end = realio.start + SZ_64K - 1; + pci_remap_iospace(&realio, ORION5X_PCIE_IO_PHYS_BASE); + + /* + * Request resources. + */ + res = kzalloc(sizeof(struct resource), GFP_KERNEL); + if (!res) + panic("pcie_setup unable to alloc resources"); + + /* + * IORESOURCE_MEM + */ + res->name = "PCIe Memory Space"; + res->flags = IORESOURCE_MEM; + res->start = ORION5X_PCIE_MEM_PHYS_BASE; + res->end = res->start + ORION5X_PCIE_MEM_SIZE - 1; + if (request_resource(&iomem_resource, res)) + panic("Request PCIe Memory resource failed\n"); + pci_add_resource_offset(&sys->resources, res, sys->mem_offset); + + return 1; +} + +/***************************************************************************** + * PCI controller + ****************************************************************************/ +#define ORION5X_PCI_REG(x) (ORION5X_PCI_VIRT_BASE + (x)) +#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) : NULL) +#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) : NULL) +#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); + +static int orion5x_pci_cardbus_mode; + +static int orion5x_pci_local_bus_nr(void) +{ + u32 conf = readl(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); + + writel(PCI_CONF_BUS(bus) | + PCI_CONF_DEV(dev) | PCI_CONF_REG(where) | + PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR); + + *val = readl(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); + + writel(PCI_CONF_BUS(bus) | + PCI_CONF_DEV(dev) | PCI_CONF_REG(where) | + PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR); + + 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_valid_config(int bus, u32 devfn) +{ + if (bus == orion5x_pci_local_bus_nr()) { + /* + * Don't go out for local device + */ + if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0) + return 0; + + /* + * When the PCI signals are directly connected to a + * Cardbus slot, ignore all but device IDs 0 and 1. + */ + if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1) + return 0; + } + + return 1; +} + +static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn, + int where, int size, u32 *val) +{ + if (!orion5x_pci_valid_config(bus->number, devfn)) { + *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 (!orion5x_pci_valid_config(bus->number, devfn)) + 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 = readl(PCI_P2P_CONF); + + if (readl(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); + writel(p2p, PCI_P2P_CONF); + } +} + +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(void) +{ + const struct mbus_dram_target_info *dram = mv_mbus_dram_info(); + u32 win_enable; + int bus; + int i; + + /* + * First, disable windows. + */ + win_enable = 0xffffffff; + writel(win_enable, PCI_BAR_ENABLE); + + /* + * Setup windows for DDR banks. + */ + bus = orion5x_pci_local_bus_nr(); + + for (i = 0; i < dram->num_cs; i++) { + const 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); + writel((cs->size - 1) & 0xfffff000, + PCI_BAR_SIZE_DDR_CS(cs->cs_index)); + writel(cs->base & 0xfffff000, + PCI_BAR_REMAP_DDR_CS(cs->cs_index)); + + /* + * Enable decode window for this chip select. + */ + win_enable &= ~(1 << cs->cs_index); + } + + /* + * Re-enable decode windows. + */ + writel(win_enable, PCI_BAR_ENABLE); + + /* + * Disable automatic update of address remapping when writing to BARs. + */ + orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1); +} + +static int __init pci_setup(struct pci_sys_data *sys) +{ + struct resource *res; + struct resource realio; + + /* + * Point PCI unit MBUS decode windows to DRAM space. + */ + orion5x_setup_pci_wins(); + + /* + * Master + Slave enable + */ + orion5x_pci_master_slave_enable(); + + /* + * Force ordering + */ + orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER); + + realio.start = sys->busnr * SZ_64K; + realio.end = realio.start + SZ_64K - 1; + pci_remap_iospace(&realio, ORION5X_PCI_IO_PHYS_BASE); + + /* + * Request resources + */ + res = kzalloc(sizeof(struct resource), GFP_KERNEL); + if (!res) + panic("pci_setup unable to alloc resources"); + + /* + * IORESOURCE_MEM + */ + res->name = "PCI Memory Space"; + res->flags = IORESOURCE_MEM; + res->start = ORION5X_PCI_MEM_PHYS_BASE; + res->end = res->start + ORION5X_PCI_MEM_SIZE - 1; + if (request_resource(&iomem_resource, res)) + panic("Request PCI Memory resource failed\n"); + pci_add_resource_offset(&sys->resources, res, sys->mem_offset); + + return 1; +} + + +/***************************************************************************** + * General PCIe + PCI + ****************************************************************************/ + +/* + * The root complex has a hardwired class of PCI_CLASS_MEMORY_OTHER, when it + * is operating as a root complex this needs to be switched to + * PCI_CLASS_BRIDGE_HOST or Linux will errantly try to process the BAR's on + * the device. Decoding setup is handled by the orion code. + */ +static void rc_pci_fixup(struct pci_dev *dev) +{ + if (dev->bus->parent == NULL && dev->devfn == 0) { + struct resource *r; + + dev->class &= 0xff; + dev->class |= PCI_CLASS_BRIDGE_HOST << 8; + pci_dev_for_each_resource(dev, r) { + r->start = 0; + r->end = 0; + r->flags = 0; + } + } +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup); + +static int orion5x_pci_disabled __initdata; + +void __init orion5x_pci_disable(void) +{ + orion5x_pci_disabled = 1; +} + +void __init orion5x_pci_set_cardbus_mode(void) +{ + orion5x_pci_cardbus_mode = 1; +} + +int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys) +{ + vga_base = ORION5X_PCIE_MEM_PHYS_BASE; + + if (nr == 0) { + orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr); + return pcie_setup(sys); + } + + if (nr == 1 && !orion5x_pci_disabled) { + orion5x_pci_set_bus_nr(sys->busnr); + return pci_setup(sys); + } + + return 0; +} + +int __init orion5x_pci_sys_scan_bus(int nr, struct pci_host_bridge *bridge) +{ + struct pci_sys_data *sys = pci_host_bridge_priv(bridge); + + list_splice_init(&sys->resources, &bridge->windows); + bridge->dev.parent = NULL; + bridge->sysdata = sys; + bridge->busnr = sys->busnr; + + if (nr == 0) { + bridge->ops = &pcie_ops; + return pci_scan_root_bus_bridge(bridge); + } + + if (nr == 1 && !orion5x_pci_disabled) { + bridge->ops = &pci_ops; + return pci_scan_root_bus_bridge(bridge); + } + + BUG(); + return -ENODEV; +} + +int __init orion5x_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + int bus = dev->bus->number; + + /* + * PCIe endpoint? + */ + if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr()) + return IRQ_ORION5X_PCIE0_INT; + + return -1; +} |