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- // SPDX-License-Identifier: GPL-2.0
- /*
- * PCIe driver for Marvell Armada 370 and Armada XP SoCs
- *
- * Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
- */
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/clk.h>
- #include <linux/delay.h>
- #include <linux/gpio.h>
- #include <linux/init.h>
- #include <linux/mbus.h>
- #include <linux/slab.h>
- #include <linux/platform_device.h>
- #include <linux/of_address.h>
- #include <linux/of_irq.h>
- #include <linux/of_gpio.h>
- #include <linux/of_pci.h>
- #include <linux/of_platform.h>
- #include "../pci.h"
- #include "../pci-bridge-emul.h"
- /*
- * PCIe unit register offsets.
- */
- #define PCIE_DEV_ID_OFF 0x0000
- #define PCIE_CMD_OFF 0x0004
- #define PCIE_DEV_REV_OFF 0x0008
- #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
- #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
- #define PCIE_CAP_PCIEXP 0x0060
- #define PCIE_HEADER_LOG_4_OFF 0x0128
- #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
- #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
- #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
- #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
- #define PCIE_WIN5_CTRL_OFF 0x1880
- #define PCIE_WIN5_BASE_OFF 0x1884
- #define PCIE_WIN5_REMAP_OFF 0x188c
- #define PCIE_CONF_ADDR_OFF 0x18f8
- #define PCIE_CONF_ADDR_EN 0x80000000
- #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
- #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
- #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
- #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
- #define PCIE_CONF_ADDR(bus, devfn, where) \
- (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
- PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
- PCIE_CONF_ADDR_EN)
- #define PCIE_CONF_DATA_OFF 0x18fc
- #define PCIE_MASK_OFF 0x1910
- #define PCIE_MASK_ENABLE_INTS 0x0f000000
- #define PCIE_CTRL_OFF 0x1a00
- #define PCIE_CTRL_X1_MODE 0x0001
- #define PCIE_STAT_OFF 0x1a04
- #define PCIE_STAT_BUS 0xff00
- #define PCIE_STAT_DEV 0x1f0000
- #define PCIE_STAT_LINK_DOWN BIT(0)
- #define PCIE_RC_RTSTA 0x1a14
- #define PCIE_DEBUG_CTRL 0x1a60
- #define PCIE_DEBUG_SOFT_RESET BIT(20)
- struct mvebu_pcie_port;
- /* Structure representing all PCIe interfaces */
- struct mvebu_pcie {
- struct platform_device *pdev;
- struct mvebu_pcie_port *ports;
- struct resource io;
- struct resource realio;
- struct resource mem;
- struct resource busn;
- int nports;
- };
- struct mvebu_pcie_window {
- phys_addr_t base;
- phys_addr_t remap;
- size_t size;
- };
- /* Structure representing one PCIe interface */
- struct mvebu_pcie_port {
- char *name;
- void __iomem *base;
- u32 port;
- u32 lane;
- int devfn;
- unsigned int mem_target;
- unsigned int mem_attr;
- unsigned int io_target;
- unsigned int io_attr;
- struct clk *clk;
- struct gpio_desc *reset_gpio;
- char *reset_name;
- struct pci_bridge_emul bridge;
- struct device_node *dn;
- struct mvebu_pcie *pcie;
- struct mvebu_pcie_window memwin;
- struct mvebu_pcie_window iowin;
- u32 saved_pcie_stat;
- struct resource regs;
- };
- static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
- {
- writel(val, port->base + reg);
- }
- static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
- {
- return readl(port->base + reg);
- }
- static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
- {
- return port->io_target != -1 && port->io_attr != -1;
- }
- static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
- {
- return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
- }
- static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
- {
- u32 stat;
- stat = mvebu_readl(port, PCIE_STAT_OFF);
- stat &= ~PCIE_STAT_BUS;
- stat |= nr << 8;
- mvebu_writel(port, stat, PCIE_STAT_OFF);
- }
- static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
- {
- u32 stat;
- stat = mvebu_readl(port, PCIE_STAT_OFF);
- stat &= ~PCIE_STAT_DEV;
- stat |= nr << 16;
- mvebu_writel(port, stat, PCIE_STAT_OFF);
- }
- /*
- * Setup PCIE BARs and Address Decode Wins:
- * BAR[0] -> internal registers (needed for MSI)
- * BAR[1] -> covers all DRAM banks
- * BAR[2] -> Disabled
- * WIN[0-3] -> DRAM bank[0-3]
- */
- static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
- {
- const struct mbus_dram_target_info *dram;
- u32 size;
- int i;
- dram = mv_mbus_dram_info();
- /* First, disable and clear BARs and windows. */
- for (i = 1; i < 3; i++) {
- mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
- mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
- mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
- }
- for (i = 0; i < 5; i++) {
- mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
- mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
- mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
- }
- mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
- mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
- mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
- /* Setup windows for DDR banks. Count total DDR size on the fly. */
- size = 0;
- for (i = 0; i < dram->num_cs; i++) {
- const struct mbus_dram_window *cs = dram->cs + i;
- mvebu_writel(port, cs->base & 0xffff0000,
- PCIE_WIN04_BASE_OFF(i));
- mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
- mvebu_writel(port,
- ((cs->size - 1) & 0xffff0000) |
- (cs->mbus_attr << 8) |
- (dram->mbus_dram_target_id << 4) | 1,
- PCIE_WIN04_CTRL_OFF(i));
- size += cs->size;
- }
- /* Round up 'size' to the nearest power of two. */
- if ((size & (size - 1)) != 0)
- size = 1 << fls(size);
- /* Setup BAR[1] to all DRAM banks. */
- mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
- mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
- mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
- PCIE_BAR_CTRL_OFF(1));
- /*
- * Point BAR[0] to the device's internal registers.
- */
- mvebu_writel(port, round_down(port->regs.start, SZ_1M), PCIE_BAR_LO_OFF(0));
- mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0));
- }
- static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
- {
- u32 cmd, mask;
- /* Point PCIe unit MBUS decode windows to DRAM space. */
- mvebu_pcie_setup_wins(port);
- /* Master + slave enable. */
- cmd = mvebu_readl(port, PCIE_CMD_OFF);
- cmd |= PCI_COMMAND_IO;
- cmd |= PCI_COMMAND_MEMORY;
- cmd |= PCI_COMMAND_MASTER;
- mvebu_writel(port, cmd, PCIE_CMD_OFF);
- /* Enable interrupt lines A-D. */
- mask = mvebu_readl(port, PCIE_MASK_OFF);
- mask |= PCIE_MASK_ENABLE_INTS;
- mvebu_writel(port, mask, PCIE_MASK_OFF);
- }
- static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
- struct pci_bus *bus,
- u32 devfn, int where, int size, u32 *val)
- {
- void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
- mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
- PCIE_CONF_ADDR_OFF);
- switch (size) {
- case 1:
- *val = readb_relaxed(conf_data + (where & 3));
- break;
- case 2:
- *val = readw_relaxed(conf_data + (where & 2));
- break;
- case 4:
- *val = readl_relaxed(conf_data);
- break;
- }
- return PCIBIOS_SUCCESSFUL;
- }
- static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
- struct pci_bus *bus,
- u32 devfn, int where, int size, u32 val)
- {
- void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
- mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
- PCIE_CONF_ADDR_OFF);
- switch (size) {
- case 1:
- writeb(val, conf_data + (where & 3));
- break;
- case 2:
- writew(val, conf_data + (where & 2));
- break;
- case 4:
- writel(val, conf_data);
- break;
- default:
- return PCIBIOS_BAD_REGISTER_NUMBER;
- }
- return PCIBIOS_SUCCESSFUL;
- }
- /*
- * Remove windows, starting from the largest ones to the smallest
- * ones.
- */
- static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
- phys_addr_t base, size_t size)
- {
- while (size) {
- size_t sz = 1 << (fls(size) - 1);
- mvebu_mbus_del_window(base, sz);
- base += sz;
- size -= sz;
- }
- }
- /*
- * MBus windows can only have a power of two size, but PCI BARs do not
- * have this constraint. Therefore, we have to split the PCI BAR into
- * areas each having a power of two size. We start from the largest
- * one (i.e highest order bit set in the size).
- */
- static void mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
- unsigned int target, unsigned int attribute,
- phys_addr_t base, size_t size,
- phys_addr_t remap)
- {
- size_t size_mapped = 0;
- while (size) {
- size_t sz = 1 << (fls(size) - 1);
- int ret;
- ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
- sz, remap);
- if (ret) {
- phys_addr_t end = base + sz - 1;
- dev_err(&port->pcie->pdev->dev,
- "Could not create MBus window at [mem %pa-%pa]: %d\n",
- &base, &end, ret);
- mvebu_pcie_del_windows(port, base - size_mapped,
- size_mapped);
- return;
- }
- size -= sz;
- size_mapped += sz;
- base += sz;
- if (remap != MVEBU_MBUS_NO_REMAP)
- remap += sz;
- }
- }
- static void mvebu_pcie_set_window(struct mvebu_pcie_port *port,
- unsigned int target, unsigned int attribute,
- const struct mvebu_pcie_window *desired,
- struct mvebu_pcie_window *cur)
- {
- if (desired->base == cur->base && desired->remap == cur->remap &&
- desired->size == cur->size)
- return;
- if (cur->size != 0) {
- mvebu_pcie_del_windows(port, cur->base, cur->size);
- cur->size = 0;
- cur->base = 0;
- /*
- * If something tries to change the window while it is enabled
- * the change will not be done atomically. That would be
- * difficult to do in the general case.
- */
- }
- if (desired->size == 0)
- return;
- mvebu_pcie_add_windows(port, target, attribute, desired->base,
- desired->size, desired->remap);
- *cur = *desired;
- }
- static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
- {
- struct mvebu_pcie_window desired = {};
- struct pci_bridge_emul_conf *conf = &port->bridge.conf;
- /* Are the new iobase/iolimit values invalid? */
- if (conf->iolimit < conf->iobase ||
- conf->iolimitupper < conf->iobaseupper ||
- !(conf->command & PCI_COMMAND_IO)) {
- mvebu_pcie_set_window(port, port->io_target, port->io_attr,
- &desired, &port->iowin);
- return;
- }
- if (!mvebu_has_ioport(port)) {
- dev_WARN(&port->pcie->pdev->dev,
- "Attempt to set IO when IO is disabled\n");
- return;
- }
- /*
- * We read the PCI-to-PCI bridge emulated registers, and
- * calculate the base address and size of the address decoding
- * window to setup, according to the PCI-to-PCI bridge
- * specifications. iobase is the bus address, port->iowin_base
- * is the CPU address.
- */
- desired.remap = ((conf->iobase & 0xF0) << 8) |
- (conf->iobaseupper << 16);
- desired.base = port->pcie->io.start + desired.remap;
- desired.size = ((0xFFF | ((conf->iolimit & 0xF0) << 8) |
- (conf->iolimitupper << 16)) -
- desired.remap) +
- 1;
- mvebu_pcie_set_window(port, port->io_target, port->io_attr, &desired,
- &port->iowin);
- }
- static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
- {
- struct mvebu_pcie_window desired = {.remap = MVEBU_MBUS_NO_REMAP};
- struct pci_bridge_emul_conf *conf = &port->bridge.conf;
- /* Are the new membase/memlimit values invalid? */
- if (conf->memlimit < conf->membase ||
- !(conf->command & PCI_COMMAND_MEMORY)) {
- mvebu_pcie_set_window(port, port->mem_target, port->mem_attr,
- &desired, &port->memwin);
- return;
- }
- /*
- * We read the PCI-to-PCI bridge emulated registers, and
- * calculate the base address and size of the address decoding
- * window to setup, according to the PCI-to-PCI bridge
- * specifications.
- */
- desired.base = ((conf->membase & 0xFFF0) << 16);
- desired.size = (((conf->memlimit & 0xFFF0) << 16) | 0xFFFFF) -
- desired.base + 1;
- mvebu_pcie_set_window(port, port->mem_target, port->mem_attr, &desired,
- &port->memwin);
- }
- static pci_bridge_emul_read_status_t
- mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
- int reg, u32 *value)
- {
- struct mvebu_pcie_port *port = bridge->data;
- switch (reg) {
- case PCI_EXP_DEVCAP:
- *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP);
- break;
- case PCI_EXP_DEVCTL:
- *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL) &
- ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
- PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
- break;
- case PCI_EXP_LNKCAP:
- /*
- * PCIe requires the clock power management capability to be
- * hard-wired to zero for downstream ports
- */
- *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
- ~PCI_EXP_LNKCAP_CLKPM;
- break;
- case PCI_EXP_LNKCTL:
- *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
- break;
- case PCI_EXP_SLTCTL:
- *value = PCI_EXP_SLTSTA_PDS << 16;
- break;
- case PCI_EXP_RTSTA:
- *value = mvebu_readl(port, PCIE_RC_RTSTA);
- break;
- default:
- return PCI_BRIDGE_EMUL_NOT_HANDLED;
- }
- return PCI_BRIDGE_EMUL_HANDLED;
- }
- static void
- mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
- int reg, u32 old, u32 new, u32 mask)
- {
- struct mvebu_pcie_port *port = bridge->data;
- struct pci_bridge_emul_conf *conf = &bridge->conf;
- switch (reg) {
- case PCI_COMMAND:
- {
- if (!mvebu_has_ioport(port))
- conf->command &= ~PCI_COMMAND_IO;
- if ((old ^ new) & PCI_COMMAND_IO)
- mvebu_pcie_handle_iobase_change(port);
- if ((old ^ new) & PCI_COMMAND_MEMORY)
- mvebu_pcie_handle_membase_change(port);
- break;
- }
- case PCI_IO_BASE:
- /*
- * We keep bit 1 set, it is a read-only bit that
- * indicates we support 32 bits addressing for the
- * I/O
- */
- conf->iobase |= PCI_IO_RANGE_TYPE_32;
- conf->iolimit |= PCI_IO_RANGE_TYPE_32;
- mvebu_pcie_handle_iobase_change(port);
- break;
- case PCI_MEMORY_BASE:
- mvebu_pcie_handle_membase_change(port);
- break;
- case PCI_IO_BASE_UPPER16:
- mvebu_pcie_handle_iobase_change(port);
- break;
- case PCI_PRIMARY_BUS:
- mvebu_pcie_set_local_bus_nr(port, conf->secondary_bus);
- break;
- default:
- break;
- }
- }
- static void
- mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
- int reg, u32 old, u32 new, u32 mask)
- {
- struct mvebu_pcie_port *port = bridge->data;
- switch (reg) {
- case PCI_EXP_DEVCTL:
- /*
- * Armada370 data says these bits must always
- * be zero when in root complex mode.
- */
- new &= ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
- PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
- mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
- break;
- case PCI_EXP_LNKCTL:
- /*
- * If we don't support CLKREQ, we must ensure that the
- * CLKREQ enable bit always reads zero. Since we haven't
- * had this capability, and it's dependent on board wiring,
- * disable it for the time being.
- */
- new &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
- mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
- break;
- case PCI_EXP_RTSTA:
- mvebu_writel(port, new, PCIE_RC_RTSTA);
- break;
- }
- }
- static struct pci_bridge_emul_ops mvebu_pci_bridge_emul_ops = {
- .write_base = mvebu_pci_bridge_emul_base_conf_write,
- .read_pcie = mvebu_pci_bridge_emul_pcie_conf_read,
- .write_pcie = mvebu_pci_bridge_emul_pcie_conf_write,
- };
- /*
- * Initialize the configuration space of the PCI-to-PCI bridge
- * associated with the given PCIe interface.
- */
- static void mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
- {
- struct pci_bridge_emul *bridge = &port->bridge;
- u32 pcie_cap = mvebu_readl(port, PCIE_CAP_PCIEXP);
- u8 pcie_cap_ver = ((pcie_cap >> 16) & PCI_EXP_FLAGS_VERS);
- bridge->conf.vendor = PCI_VENDOR_ID_MARVELL;
- bridge->conf.device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
- bridge->conf.class_revision =
- mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
- if (mvebu_has_ioport(port)) {
- /* We support 32 bits I/O addressing */
- bridge->conf.iobase = PCI_IO_RANGE_TYPE_32;
- bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
- }
- /*
- * Older mvebu hardware provides PCIe Capability structure only in
- * version 1. New hardware provides it in version 2.
- */
- bridge->pcie_conf.cap = cpu_to_le16(pcie_cap_ver);
- bridge->has_pcie = true;
- bridge->data = port;
- bridge->ops = &mvebu_pci_bridge_emul_ops;
- pci_bridge_emul_init(bridge, PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR);
- }
- static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
- {
- return sys->private_data;
- }
- static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
- struct pci_bus *bus,
- int devfn)
- {
- int i;
- for (i = 0; i < pcie->nports; i++) {
- struct mvebu_pcie_port *port = &pcie->ports[i];
- if (bus->number == 0 && port->devfn == devfn)
- return port;
- if (bus->number != 0 &&
- bus->number >= port->bridge.conf.secondary_bus &&
- bus->number <= port->bridge.conf.subordinate_bus)
- return port;
- }
- return NULL;
- }
- /* PCI configuration space write function */
- static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
- int where, int size, u32 val)
- {
- struct mvebu_pcie *pcie = bus->sysdata;
- struct mvebu_pcie_port *port;
- int ret;
- port = mvebu_pcie_find_port(pcie, bus, devfn);
- if (!port)
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* Access the emulated PCI-to-PCI bridge */
- if (bus->number == 0)
- return pci_bridge_emul_conf_write(&port->bridge, where,
- size, val);
- if (!mvebu_pcie_link_up(port))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* Access the real PCIe interface */
- ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
- where, size, val);
- return ret;
- }
- /* PCI configuration space read function */
- static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
- int size, u32 *val)
- {
- struct mvebu_pcie *pcie = bus->sysdata;
- struct mvebu_pcie_port *port;
- int ret;
- port = mvebu_pcie_find_port(pcie, bus, devfn);
- if (!port) {
- *val = 0xffffffff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- /* Access the emulated PCI-to-PCI bridge */
- if (bus->number == 0)
- return pci_bridge_emul_conf_read(&port->bridge, where,
- size, val);
- if (!mvebu_pcie_link_up(port)) {
- *val = 0xffffffff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- /* Access the real PCIe interface */
- ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
- where, size, val);
- return ret;
- }
- static struct pci_ops mvebu_pcie_ops = {
- .read = mvebu_pcie_rd_conf,
- .write = mvebu_pcie_wr_conf,
- };
- static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
- const struct resource *res,
- resource_size_t start,
- resource_size_t size,
- resource_size_t align)
- {
- if (dev->bus->number != 0)
- return start;
- /*
- * On the PCI-to-PCI bridge side, the I/O windows must have at
- * least a 64 KB size and the memory windows must have at
- * least a 1 MB size. Moreover, MBus windows need to have a
- * base address aligned on their size, and their size must be
- * a power of two. This means that if the BAR doesn't have a
- * power of two size, several MBus windows will actually be
- * created. We need to ensure that the biggest MBus window
- * (which will be the first one) is aligned on its size, which
- * explains the rounddown_pow_of_two() being done here.
- */
- if (res->flags & IORESOURCE_IO)
- return round_up(start, max_t(resource_size_t, SZ_64K,
- rounddown_pow_of_two(size)));
- else if (res->flags & IORESOURCE_MEM)
- return round_up(start, max_t(resource_size_t, SZ_1M,
- rounddown_pow_of_two(size)));
- else
- return start;
- }
- static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
- struct device_node *np,
- struct mvebu_pcie_port *port)
- {
- int ret = 0;
- ret = of_address_to_resource(np, 0, &port->regs);
- if (ret)
- return (void __iomem *)ERR_PTR(ret);
- return devm_ioremap_resource(&pdev->dev, &port->regs);
- }
- #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
- #define DT_TYPE_IO 0x1
- #define DT_TYPE_MEM32 0x2
- #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
- #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
- static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
- unsigned long type,
- unsigned int *tgt,
- unsigned int *attr)
- {
- const int na = 3, ns = 2;
- const __be32 *range;
- int rlen, nranges, rangesz, pna, i;
- *tgt = -1;
- *attr = -1;
- range = of_get_property(np, "ranges", &rlen);
- if (!range)
- return -EINVAL;
- pna = of_n_addr_cells(np);
- rangesz = pna + na + ns;
- nranges = rlen / sizeof(__be32) / rangesz;
- for (i = 0; i < nranges; i++, range += rangesz) {
- u32 flags = of_read_number(range, 1);
- u32 slot = of_read_number(range + 1, 1);
- u64 cpuaddr = of_read_number(range + na, pna);
- unsigned long rtype;
- if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
- rtype = IORESOURCE_IO;
- else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
- rtype = IORESOURCE_MEM;
- else
- continue;
- if (slot == PCI_SLOT(devfn) && type == rtype) {
- *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
- *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
- return 0;
- }
- }
- return -ENOENT;
- }
- #ifdef CONFIG_PM_SLEEP
- static int mvebu_pcie_suspend(struct device *dev)
- {
- struct mvebu_pcie *pcie;
- int i;
- pcie = dev_get_drvdata(dev);
- for (i = 0; i < pcie->nports; i++) {
- struct mvebu_pcie_port *port = pcie->ports + i;
- port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);
- }
- return 0;
- }
- static int mvebu_pcie_resume(struct device *dev)
- {
- struct mvebu_pcie *pcie;
- int i;
- pcie = dev_get_drvdata(dev);
- for (i = 0; i < pcie->nports; i++) {
- struct mvebu_pcie_port *port = pcie->ports + i;
- mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);
- mvebu_pcie_setup_hw(port);
- }
- return 0;
- }
- #endif
- static void mvebu_pcie_port_clk_put(void *data)
- {
- struct mvebu_pcie_port *port = data;
- clk_put(port->clk);
- }
- static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
- struct mvebu_pcie_port *port, struct device_node *child)
- {
- struct device *dev = &pcie->pdev->dev;
- enum of_gpio_flags flags;
- int reset_gpio, ret;
- port->pcie = pcie;
- if (of_property_read_u32(child, "marvell,pcie-port", &port->port)) {
- dev_warn(dev, "ignoring %pOF, missing pcie-port property\n",
- child);
- goto skip;
- }
- if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane))
- port->lane = 0;
- port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port,
- port->lane);
- if (!port->name) {
- ret = -ENOMEM;
- goto err;
- }
- port->devfn = of_pci_get_devfn(child);
- if (port->devfn < 0)
- goto skip;
- ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM,
- &port->mem_target, &port->mem_attr);
- if (ret < 0) {
- dev_err(dev, "%s: cannot get tgt/attr for mem window\n",
- port->name);
- goto skip;
- }
- if (resource_size(&pcie->io) != 0) {
- mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_IO,
- &port->io_target, &port->io_attr);
- } else {
- port->io_target = -1;
- port->io_attr = -1;
- }
- reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags);
- if (reset_gpio == -EPROBE_DEFER) {
- ret = reset_gpio;
- goto err;
- }
- if (gpio_is_valid(reset_gpio)) {
- unsigned long gpio_flags;
- port->reset_name = devm_kasprintf(dev, GFP_KERNEL, "%s-reset",
- port->name);
- if (!port->reset_name) {
- ret = -ENOMEM;
- goto err;
- }
- if (flags & OF_GPIO_ACTIVE_LOW) {
- dev_info(dev, "%pOF: reset gpio is active low\n",
- child);
- gpio_flags = GPIOF_ACTIVE_LOW |
- GPIOF_OUT_INIT_LOW;
- } else {
- gpio_flags = GPIOF_OUT_INIT_HIGH;
- }
- ret = devm_gpio_request_one(dev, reset_gpio, gpio_flags,
- port->reset_name);
- if (ret) {
- if (ret == -EPROBE_DEFER)
- goto err;
- goto skip;
- }
- port->reset_gpio = gpio_to_desc(reset_gpio);
- }
- port->clk = of_clk_get_by_name(child, NULL);
- if (IS_ERR(port->clk)) {
- dev_err(dev, "%s: cannot get clock\n", port->name);
- goto skip;
- }
- ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port);
- if (ret < 0) {
- clk_put(port->clk);
- goto err;
- }
- return 1;
- skip:
- ret = 0;
- /* In the case of skipping, we need to free these */
- devm_kfree(dev, port->reset_name);
- port->reset_name = NULL;
- devm_kfree(dev, port->name);
- port->name = NULL;
- err:
- return ret;
- }
- /*
- * Power up a PCIe port. PCIe requires the refclk to be stable for 100µs
- * prior to releasing PERST. See table 2-4 in section 2.6.2 AC Specifications
- * of the PCI Express Card Electromechanical Specification, 1.1.
- */
- static int mvebu_pcie_powerup(struct mvebu_pcie_port *port)
- {
- int ret;
- ret = clk_prepare_enable(port->clk);
- if (ret < 0)
- return ret;
- if (port->reset_gpio) {
- u32 reset_udelay = PCI_PM_D3COLD_WAIT * 1000;
- of_property_read_u32(port->dn, "reset-delay-us",
- &reset_udelay);
- udelay(100);
- gpiod_set_value_cansleep(port->reset_gpio, 0);
- msleep(reset_udelay / 1000);
- }
- return 0;
- }
- /*
- * Power down a PCIe port. Strictly, PCIe requires us to place the card
- * in D3hot state before asserting PERST#.
- */
- static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
- {
- gpiod_set_value_cansleep(port->reset_gpio, 1);
- clk_disable_unprepare(port->clk);
- }
- /*
- * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
- * so we need extra resource setup parsing our special DT properties encoding
- * the MEM and IO apertures.
- */
- static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
- {
- struct device *dev = &pcie->pdev->dev;
- struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
- int ret;
- /* Get the PCIe memory aperture */
- mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
- if (resource_size(&pcie->mem) == 0) {
- dev_err(dev, "invalid memory aperture size\n");
- return -EINVAL;
- }
- pcie->mem.name = "PCI MEM";
- pci_add_resource(&bridge->windows, &pcie->mem);
- ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
- if (ret)
- return ret;
- /* Get the PCIe IO aperture */
- mvebu_mbus_get_pcie_io_aperture(&pcie->io);
- if (resource_size(&pcie->io) != 0) {
- pcie->realio.flags = pcie->io.flags;
- pcie->realio.start = PCIBIOS_MIN_IO;
- pcie->realio.end = min_t(resource_size_t,
- IO_SPACE_LIMIT - SZ_64K,
- resource_size(&pcie->io) - 1);
- pcie->realio.name = "PCI I/O";
- pci_add_resource(&bridge->windows, &pcie->realio);
- ret = devm_request_resource(dev, &ioport_resource, &pcie->realio);
- if (ret)
- return ret;
- }
- return 0;
- }
- /*
- * This is a copy of pci_host_probe(), except that it does the I/O
- * remap as the last step, once we are sure we won't fail.
- *
- * It should be removed once the I/O remap error handling issue has
- * been sorted out.
- */
- static int mvebu_pci_host_probe(struct pci_host_bridge *bridge)
- {
- struct mvebu_pcie *pcie;
- struct pci_bus *bus, *child;
- int ret;
- ret = pci_scan_root_bus_bridge(bridge);
- if (ret < 0) {
- dev_err(bridge->dev.parent, "Scanning root bridge failed");
- return ret;
- }
- pcie = pci_host_bridge_priv(bridge);
- if (resource_size(&pcie->io) != 0) {
- unsigned int i;
- for (i = 0; i < resource_size(&pcie->realio); i += SZ_64K)
- pci_ioremap_io(i, pcie->io.start + i);
- }
- bus = bridge->bus;
- /*
- * We insert PCI resources into the iomem_resource and
- * ioport_resource trees in either pci_bus_claim_resources()
- * or pci_bus_assign_resources().
- */
- if (pci_has_flag(PCI_PROBE_ONLY)) {
- pci_bus_claim_resources(bus);
- } else {
- pci_bus_size_bridges(bus);
- pci_bus_assign_resources(bus);
- list_for_each_entry(child, &bus->children, node)
- pcie_bus_configure_settings(child);
- }
- pci_bus_add_devices(bus);
- return 0;
- }
- static int mvebu_pcie_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct mvebu_pcie *pcie;
- struct pci_host_bridge *bridge;
- struct device_node *np = dev->of_node;
- struct device_node *child;
- int num, i, ret;
- bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct mvebu_pcie));
- if (!bridge)
- return -ENOMEM;
- pcie = pci_host_bridge_priv(bridge);
- pcie->pdev = pdev;
- platform_set_drvdata(pdev, pcie);
- ret = mvebu_pcie_parse_request_resources(pcie);
- if (ret)
- return ret;
- num = of_get_available_child_count(np);
- pcie->ports = devm_kcalloc(dev, num, sizeof(*pcie->ports), GFP_KERNEL);
- if (!pcie->ports)
- return -ENOMEM;
- i = 0;
- for_each_available_child_of_node(np, child) {
- struct mvebu_pcie_port *port = &pcie->ports[i];
- ret = mvebu_pcie_parse_port(pcie, port, child);
- if (ret < 0) {
- of_node_put(child);
- return ret;
- } else if (ret == 0) {
- continue;
- }
- port->dn = child;
- i++;
- }
- pcie->nports = i;
- for (i = 0; i < pcie->nports; i++) {
- struct mvebu_pcie_port *port = &pcie->ports[i];
- child = port->dn;
- if (!child)
- continue;
- ret = mvebu_pcie_powerup(port);
- if (ret < 0)
- continue;
- port->base = mvebu_pcie_map_registers(pdev, child, port);
- if (IS_ERR(port->base)) {
- dev_err(dev, "%s: cannot map registers\n", port->name);
- port->base = NULL;
- mvebu_pcie_powerdown(port);
- continue;
- }
- mvebu_pcie_setup_hw(port);
- mvebu_pcie_set_local_dev_nr(port, 1);
- mvebu_pci_bridge_emul_init(port);
- }
- pcie->nports = i;
- bridge->sysdata = pcie;
- bridge->ops = &mvebu_pcie_ops;
- bridge->align_resource = mvebu_pcie_align_resource;
- return mvebu_pci_host_probe(bridge);
- }
- static const struct of_device_id mvebu_pcie_of_match_table[] = {
- { .compatible = "marvell,armada-xp-pcie", },
- { .compatible = "marvell,armada-370-pcie", },
- { .compatible = "marvell,dove-pcie", },
- { .compatible = "marvell,kirkwood-pcie", },
- {},
- };
- static const struct dev_pm_ops mvebu_pcie_pm_ops = {
- SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mvebu_pcie_suspend, mvebu_pcie_resume)
- };
- static struct platform_driver mvebu_pcie_driver = {
- .driver = {
- .name = "mvebu-pcie",
- .of_match_table = mvebu_pcie_of_match_table,
- /* driver unloading/unbinding currently not supported */
- .suppress_bind_attrs = true,
- .pm = &mvebu_pcie_pm_ops,
- },
- .probe = mvebu_pcie_probe,
- };
- builtin_platform_driver(mvebu_pcie_driver);
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