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-rw-r--r--arch/mips/pci/pci-octeon.c675
1 files changed, 675 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-octeon.c b/arch/mips/pci/pci-octeon.c
new file mode 100644
index 000000000000..9cb0c807f564
--- /dev/null
+++ b/arch/mips/pci/pci-octeon.c
@@ -0,0 +1,675 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005-2009 Cavium Networks
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/delay.h>
+
+#include <asm/time.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-npi-defs.h>
+#include <asm/octeon/cvmx-pci-defs.h>
+#include <asm/octeon/pci-octeon.h>
+
+#define USE_OCTEON_INTERNAL_ARBITER
+
+/*
+ * Octeon's PCI controller uses did=3, subdid=2 for PCI IO
+ * addresses. Use PCI endian swapping 1 so no address swapping is
+ * necessary. The Linux io routines will endian swap the data.
+ */
+#define OCTEON_PCI_IOSPACE_BASE 0x80011a0400000000ull
+#define OCTEON_PCI_IOSPACE_SIZE (1ull<<32)
+
+/* Octeon't PCI controller uses did=3, subdid=3 for PCI memory. */
+#define OCTEON_PCI_MEMSPACE_OFFSET (0x00011b0000000000ull)
+
+/**
+ * This is the bit decoding used for the Octeon PCI controller addresses
+ */
+union octeon_pci_address {
+ uint64_t u64;
+ struct {
+ uint64_t upper:2;
+ uint64_t reserved:13;
+ uint64_t io:1;
+ uint64_t did:5;
+ uint64_t subdid:3;
+ uint64_t reserved2:4;
+ uint64_t endian_swap:2;
+ uint64_t reserved3:10;
+ uint64_t bus:8;
+ uint64_t dev:5;
+ uint64_t func:3;
+ uint64_t reg:8;
+ } s;
+};
+
+int __initdata (*octeon_pcibios_map_irq)(const struct pci_dev *dev,
+ u8 slot, u8 pin);
+enum octeon_dma_bar_type octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_INVALID;
+
+/**
+ * Map a PCI device to the appropriate interrupt line
+ *
+ * @dev: The Linux PCI device structure for the device to map
+ * @slot: The slot number for this device on __BUS 0__. Linux
+ * enumerates through all the bridges and figures out the
+ * slot on Bus 0 where this device eventually hooks to.
+ * @pin: The PCI interrupt pin read from the device, then swizzled
+ * as it goes through each bridge.
+ * Returns Interrupt number for the device
+ */
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ if (octeon_pcibios_map_irq)
+ return octeon_pcibios_map_irq(dev, slot, pin);
+ else
+ panic("octeon_pcibios_map_irq not set.");
+}
+
+
+/*
+ * Called to perform platform specific PCI setup
+ */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+ uint16_t config;
+ uint32_t dconfig;
+ int pos;
+ /*
+ * Force the Cache line setting to 64 bytes. The standard
+ * Linux bus scan doesn't seem to set it. Octeon really has
+ * 128 byte lines, but Intel bridges get really upset if you
+ * try and set values above 64 bytes. Value is specified in
+ * 32bit words.
+ */
+ pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 64 / 4);
+ /* Set latency timers for all devices */
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, 48);
+
+ /* Enable reporting System errors and parity errors on all devices */
+ /* Enable parity checking and error reporting */
+ pci_read_config_word(dev, PCI_COMMAND, &config);
+ config |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
+ pci_write_config_word(dev, PCI_COMMAND, config);
+
+ if (dev->subordinate) {
+ /* Set latency timers on sub bridges */
+ pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 48);
+ /* More bridge error detection */
+ pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &config);
+ config |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
+ pci_write_config_word(dev, PCI_BRIDGE_CONTROL, config);
+ }
+
+ /* Enable the PCIe normal error reporting */
+ pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+ if (pos) {
+ /* Update Device Control */
+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &config);
+ /* Correctable Error Reporting */
+ config |= PCI_EXP_DEVCTL_CERE;
+ /* Non-Fatal Error Reporting */
+ config |= PCI_EXP_DEVCTL_NFERE;
+ /* Fatal Error Reporting */
+ config |= PCI_EXP_DEVCTL_FERE;
+ /* Unsupported Request */
+ config |= PCI_EXP_DEVCTL_URRE;
+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, config);
+ }
+
+ /* Find the Advanced Error Reporting capability */
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+ if (pos) {
+ /* Clear Uncorrectable Error Status */
+ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
+ &dconfig);
+ pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
+ dconfig);
+ /* Enable reporting of all uncorrectable errors */
+ /* Uncorrectable Error Mask - turned on bits disable errors */
+ pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, 0);
+ /*
+ * Leave severity at HW default. This only controls if
+ * errors are reported as uncorrectable or
+ * correctable, not if the error is reported.
+ */
+ /* PCI_ERR_UNCOR_SEVER - Uncorrectable Error Severity */
+ /* Clear Correctable Error Status */
+ pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &dconfig);
+ pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, dconfig);
+ /* Enable reporting of all correctable errors */
+ /* Correctable Error Mask - turned on bits disable errors */
+ pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, 0);
+ /* Advanced Error Capabilities */
+ pci_read_config_dword(dev, pos + PCI_ERR_CAP, &dconfig);
+ /* ECRC Generation Enable */
+ if (config & PCI_ERR_CAP_ECRC_GENC)
+ config |= PCI_ERR_CAP_ECRC_GENE;
+ /* ECRC Check Enable */
+ if (config & PCI_ERR_CAP_ECRC_CHKC)
+ config |= PCI_ERR_CAP_ECRC_CHKE;
+ pci_write_config_dword(dev, pos + PCI_ERR_CAP, dconfig);
+ /* PCI_ERR_HEADER_LOG - Header Log Register (16 bytes) */
+ /* Report all errors to the root complex */
+ pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND,
+ PCI_ERR_ROOT_CMD_COR_EN |
+ PCI_ERR_ROOT_CMD_NONFATAL_EN |
+ PCI_ERR_ROOT_CMD_FATAL_EN);
+ /* Clear the Root status register */
+ pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &dconfig);
+ pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, dconfig);
+ }
+
+ return 0;
+}
+
+/**
+ * Return the mapping of PCI device number to IRQ line. Each
+ * character in the return string represents the interrupt
+ * line for the device at that position. Device 1 maps to the
+ * first character, etc. The characters A-D are used for PCI
+ * interrupts.
+ *
+ * Returns PCI interrupt mapping
+ */
+const char *octeon_get_pci_interrupts(void)
+{
+ /*
+ * Returning an empty string causes the interrupts to be
+ * routed based on the PCI specification. From the PCI spec:
+ *
+ * INTA# of Device Number 0 is connected to IRQW on the system
+ * board. (Device Number has no significance regarding being
+ * located on the system board or in a connector.) INTA# of
+ * Device Number 1 is connected to IRQX on the system
+ * board. INTA# of Device Number 2 is connected to IRQY on the
+ * system board. INTA# of Device Number 3 is connected to IRQZ
+ * on the system board. The table below describes how each
+ * agent's INTx# lines are connected to the system board
+ * interrupt lines. The following equation can be used to
+ * determine to which INTx# signal on the system board a given
+ * device's INTx# line(s) is connected.
+ *
+ * MB = (D + I) MOD 4 MB = System board Interrupt (IRQW = 0,
+ * IRQX = 1, IRQY = 2, and IRQZ = 3) D = Device Number I =
+ * Interrupt Number (INTA# = 0, INTB# = 1, INTC# = 2, and
+ * INTD# = 3)
+ */
+ switch (octeon_bootinfo->board_type) {
+ case CVMX_BOARD_TYPE_NAO38:
+ /* This is really the NAC38 */
+ return "AAAAADABAAAAAAAAAAAAAAAAAAAAAAAA";
+ case CVMX_BOARD_TYPE_THUNDER:
+ return "";
+ case CVMX_BOARD_TYPE_EBH3000:
+ return "";
+ case CVMX_BOARD_TYPE_EBH3100:
+ case CVMX_BOARD_TYPE_CN3010_EVB_HS5:
+ case CVMX_BOARD_TYPE_CN3005_EVB_HS5:
+ return "AAABAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
+ case CVMX_BOARD_TYPE_BBGW_REF:
+ return "AABCD";
+ default:
+ return "";
+ }
+}
+
+/**
+ * Map a PCI device to the appropriate interrupt line
+ *
+ * @dev: The Linux PCI device structure for the device to map
+ * @slot: The slot number for this device on __BUS 0__. Linux
+ * enumerates through all the bridges and figures out the
+ * slot on Bus 0 where this device eventually hooks to.
+ * @pin: The PCI interrupt pin read from the device, then swizzled
+ * as it goes through each bridge.
+ * Returns Interrupt number for the device
+ */
+int __init octeon_pci_pcibios_map_irq(const struct pci_dev *dev,
+ u8 slot, u8 pin)
+{
+ int irq_num;
+ const char *interrupts;
+ int dev_num;
+
+ /* Get the board specific interrupt mapping */
+ interrupts = octeon_get_pci_interrupts();
+
+ dev_num = dev->devfn >> 3;
+ if (dev_num < strlen(interrupts))
+ irq_num = ((interrupts[dev_num] - 'A' + pin - 1) & 3) +
+ OCTEON_IRQ_PCI_INT0;
+ else
+ irq_num = ((slot + pin - 3) & 3) + OCTEON_IRQ_PCI_INT0;
+ return irq_num;
+}
+
+
+/*
+ * Read a value from configuration space
+ */
+static int octeon_read_config(struct pci_bus *bus, unsigned int devfn,
+ int reg, int size, u32 *val)
+{
+ union octeon_pci_address pci_addr;
+
+ pci_addr.u64 = 0;
+ pci_addr.s.upper = 2;
+ pci_addr.s.io = 1;
+ pci_addr.s.did = 3;
+ pci_addr.s.subdid = 1;
+ pci_addr.s.endian_swap = 1;
+ pci_addr.s.bus = bus->number;
+ pci_addr.s.dev = devfn >> 3;
+ pci_addr.s.func = devfn & 0x7;
+ pci_addr.s.reg = reg;
+
+#if PCI_CONFIG_SPACE_DELAY
+ udelay(PCI_CONFIG_SPACE_DELAY);
+#endif
+ switch (size) {
+ case 4:
+ *val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64));
+ return PCIBIOS_SUCCESSFUL;
+ case 2:
+ *val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64));
+ return PCIBIOS_SUCCESSFUL;
+ case 1:
+ *val = cvmx_read64_uint8(pci_addr.u64);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ return PCIBIOS_FUNC_NOT_SUPPORTED;
+}
+
+
+/*
+ * Write a value to PCI configuration space
+ */
+static int octeon_write_config(struct pci_bus *bus, unsigned int devfn,
+ int reg, int size, u32 val)
+{
+ union octeon_pci_address pci_addr;
+
+ pci_addr.u64 = 0;
+ pci_addr.s.upper = 2;
+ pci_addr.s.io = 1;
+ pci_addr.s.did = 3;
+ pci_addr.s.subdid = 1;
+ pci_addr.s.endian_swap = 1;
+ pci_addr.s.bus = bus->number;
+ pci_addr.s.dev = devfn >> 3;
+ pci_addr.s.func = devfn & 0x7;
+ pci_addr.s.reg = reg;
+
+#if PCI_CONFIG_SPACE_DELAY
+ udelay(PCI_CONFIG_SPACE_DELAY);
+#endif
+ switch (size) {
+ case 4:
+ cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val));
+ return PCIBIOS_SUCCESSFUL;
+ case 2:
+ cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val));
+ return PCIBIOS_SUCCESSFUL;
+ case 1:
+ cvmx_write64_uint8(pci_addr.u64, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ return PCIBIOS_FUNC_NOT_SUPPORTED;
+}
+
+
+static struct pci_ops octeon_pci_ops = {
+ octeon_read_config,
+ octeon_write_config,
+};
+
+static struct resource octeon_pci_mem_resource = {
+ .start = 0,
+ .end = 0,
+ .name = "Octeon PCI MEM",
+ .flags = IORESOURCE_MEM,
+};
+
+/*
+ * PCI ports must be above 16KB so the ISA bus filtering in the PCI-X to PCI
+ * bridge
+ */
+static struct resource octeon_pci_io_resource = {
+ .start = 0x4000,
+ .end = OCTEON_PCI_IOSPACE_SIZE - 1,
+ .name = "Octeon PCI IO",
+ .flags = IORESOURCE_IO,
+};
+
+static struct pci_controller octeon_pci_controller = {
+ .pci_ops = &octeon_pci_ops,
+ .mem_resource = &octeon_pci_mem_resource,
+ .mem_offset = OCTEON_PCI_MEMSPACE_OFFSET,
+ .io_resource = &octeon_pci_io_resource,
+ .io_offset = 0,
+ .io_map_base = OCTEON_PCI_IOSPACE_BASE,
+};
+
+
+/*
+ * Low level initialize the Octeon PCI controller
+ */
+static void octeon_pci_initialize(void)
+{
+ union cvmx_pci_cfg01 cfg01;
+ union cvmx_npi_ctl_status ctl_status;
+ union cvmx_pci_ctl_status_2 ctl_status_2;
+ union cvmx_pci_cfg19 cfg19;
+ union cvmx_pci_cfg16 cfg16;
+ union cvmx_pci_cfg22 cfg22;
+ union cvmx_pci_cfg56 cfg56;
+
+ /* Reset the PCI Bus */
+ cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x1);
+ cvmx_read_csr(CVMX_CIU_SOFT_PRST);
+
+ udelay(2000); /* Hold PCI reset for 2 ms */
+
+ ctl_status.u64 = 0; /* cvmx_read_csr(CVMX_NPI_CTL_STATUS); */
+ ctl_status.s.max_word = 1;
+ ctl_status.s.timer = 1;
+ cvmx_write_csr(CVMX_NPI_CTL_STATUS, ctl_status.u64);
+
+ /* Deassert PCI reset and advertize PCX Host Mode Device Capability
+ (64b) */
+ cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x4);
+ cvmx_read_csr(CVMX_CIU_SOFT_PRST);
+
+ udelay(2000); /* Wait 2 ms after deasserting PCI reset */
+
+ ctl_status_2.u32 = 0;
+ ctl_status_2.s.tsr_hwm = 1; /* Initializes to 0. Must be set
+ before any PCI reads. */
+ ctl_status_2.s.bar2pres = 1; /* Enable BAR2 */
+ ctl_status_2.s.bar2_enb = 1;
+ ctl_status_2.s.bar2_cax = 1; /* Don't use L2 */
+ ctl_status_2.s.bar2_esx = 1;
+ ctl_status_2.s.pmo_amod = 1; /* Round robin priority */
+ if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
+ /* BAR1 hole */
+ ctl_status_2.s.bb1_hole = OCTEON_PCI_BAR1_HOLE_BITS;
+ ctl_status_2.s.bb1_siz = 1; /* BAR1 is 2GB */
+ ctl_status_2.s.bb_ca = 1; /* Don't use L2 with big bars */
+ ctl_status_2.s.bb_es = 1; /* Big bar in byte swap mode */
+ ctl_status_2.s.bb1 = 1; /* BAR1 is big */
+ ctl_status_2.s.bb0 = 1; /* BAR0 is big */
+ }
+
+ octeon_npi_write32(CVMX_NPI_PCI_CTL_STATUS_2, ctl_status_2.u32);
+ udelay(2000); /* Wait 2 ms before doing PCI reads */
+
+ ctl_status_2.u32 = octeon_npi_read32(CVMX_NPI_PCI_CTL_STATUS_2);
+ pr_notice("PCI Status: %s %s-bit\n",
+ ctl_status_2.s.ap_pcix ? "PCI-X" : "PCI",
+ ctl_status_2.s.ap_64ad ? "64" : "32");
+
+ if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
+ union cvmx_pci_cnt_reg cnt_reg_start;
+ union cvmx_pci_cnt_reg cnt_reg_end;
+ unsigned long cycles, pci_clock;
+
+ cnt_reg_start.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
+ cycles = read_c0_cvmcount();
+ udelay(1000);
+ cnt_reg_end.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
+ cycles = read_c0_cvmcount() - cycles;
+ pci_clock = (cnt_reg_end.s.pcicnt - cnt_reg_start.s.pcicnt) /
+ (cycles / (mips_hpt_frequency / 1000000));
+ pr_notice("PCI Clock: %lu MHz\n", pci_clock);
+ }
+
+ /*
+ * TDOMC must be set to one in PCI mode. TDOMC should be set to 4
+ * in PCI-X mode to allow four oustanding splits. Otherwise,
+ * should not change from its reset value. Don't write PCI_CFG19
+ * in PCI mode (0x82000001 reset value), write it to 0x82000004
+ * after PCI-X mode is known. MRBCI,MDWE,MDRE -> must be zero.
+ * MRBCM -> must be one.
+ */
+ if (ctl_status_2.s.ap_pcix) {
+ cfg19.u32 = 0;
+ /*
+ * Target Delayed/Split request outstanding maximum
+ * count. [1..31] and 0=32. NOTE: If the user
+ * programs these bits beyond the Designed Maximum
+ * outstanding count, then the designed maximum table
+ * depth will be used instead. No additional
+ * Deferred/Split transactions will be accepted if
+ * this outstanding maximum count is
+ * reached. Furthermore, no additional deferred/split
+ * transactions will be accepted if the I/O delay/ I/O
+ * Split Request outstanding maximum is reached.
+ */
+ cfg19.s.tdomc = 4;
+ /*
+ * Master Deferred Read Request Outstanding Max Count
+ * (PCI only). CR4C[26:24] Max SAC cycles MAX DAC
+ * cycles 000 8 4 001 1 0 010 2 1 011 3 1 100 4 2 101
+ * 5 2 110 6 3 111 7 3 For example, if these bits are
+ * programmed to 100, the core can support 2 DAC
+ * cycles, 4 SAC cycles or a combination of 1 DAC and
+ * 2 SAC cycles. NOTE: For the PCI-X maximum
+ * outstanding split transactions, refer to
+ * CRE0[22:20].
+ */
+ cfg19.s.mdrrmc = 2;
+ /*
+ * Master Request (Memory Read) Byte Count/Byte Enable
+ * select. 0 = Byte Enables valid. In PCI mode, a
+ * burst transaction cannot be performed using Memory
+ * Read command=4?h6. 1 = DWORD Byte Count valid
+ * (default). In PCI Mode, the memory read byte
+ * enables are automatically generated by the
+ * core. Note: N3 Master Request transaction sizes are
+ * always determined through the
+ * am_attr[<35:32>|<7:0>] field.
+ */
+ cfg19.s.mrbcm = 1;
+ octeon_npi_write32(CVMX_NPI_PCI_CFG19, cfg19.u32);
+ }
+
+
+ cfg01.u32 = 0;
+ cfg01.s.msae = 1; /* Memory Space Access Enable */
+ cfg01.s.me = 1; /* Master Enable */
+ cfg01.s.pee = 1; /* PERR# Enable */
+ cfg01.s.see = 1; /* System Error Enable */
+ cfg01.s.fbbe = 1; /* Fast Back to Back Transaction Enable */
+
+ octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+
+#ifdef USE_OCTEON_INTERNAL_ARBITER
+ /*
+ * When OCTEON is a PCI host, most systems will use OCTEON's
+ * internal arbiter, so must enable it before any PCI/PCI-X
+ * traffic can occur.
+ */
+ {
+ union cvmx_npi_pci_int_arb_cfg pci_int_arb_cfg;
+
+ pci_int_arb_cfg.u64 = 0;
+ pci_int_arb_cfg.s.en = 1; /* Internal arbiter enable */
+ cvmx_write_csr(CVMX_NPI_PCI_INT_ARB_CFG, pci_int_arb_cfg.u64);
+ }
+#endif /* USE_OCTEON_INTERNAL_ARBITER */
+
+ /*
+ * Preferrably written to 1 to set MLTD. [RDSATI,TRTAE,
+ * TWTAE,TMAE,DPPMR -> must be zero. TILT -> must not be set to
+ * 1..7.
+ */
+ cfg16.u32 = 0;
+ cfg16.s.mltd = 1; /* Master Latency Timer Disable */
+ octeon_npi_write32(CVMX_NPI_PCI_CFG16, cfg16.u32);
+
+ /*
+ * Should be written to 0x4ff00. MTTV -> must be zero.
+ * FLUSH -> must be 1. MRV -> should be 0xFF.
+ */
+ cfg22.u32 = 0;
+ /* Master Retry Value [1..255] and 0=infinite */
+ cfg22.s.mrv = 0xff;
+ /*
+ * AM_DO_FLUSH_I control NOTE: This bit MUST BE ONE for proper
+ * N3K operation.
+ */
+ cfg22.s.flush = 1;
+ octeon_npi_write32(CVMX_NPI_PCI_CFG22, cfg22.u32);
+
+ /*
+ * MOST Indicates the maximum number of outstanding splits (in -1
+ * notation) when OCTEON is in PCI-X mode. PCI-X performance is
+ * affected by the MOST selection. Should generally be written
+ * with one of 0x3be807, 0x2be807, 0x1be807, or 0x0be807,
+ * depending on the desired MOST of 3, 2, 1, or 0, respectively.
+ */
+ cfg56.u32 = 0;
+ cfg56.s.pxcid = 7; /* RO - PCI-X Capability ID */
+ cfg56.s.ncp = 0xe8; /* RO - Next Capability Pointer */
+ cfg56.s.dpere = 1; /* Data Parity Error Recovery Enable */
+ cfg56.s.roe = 1; /* Relaxed Ordering Enable */
+ cfg56.s.mmbc = 1; /* Maximum Memory Byte Count
+ [0=512B,1=1024B,2=2048B,3=4096B] */
+ cfg56.s.most = 3; /* Maximum outstanding Split transactions [0=1
+ .. 7=32] */
+
+ octeon_npi_write32(CVMX_NPI_PCI_CFG56, cfg56.u32);
+
+ /*
+ * Affects PCI performance when OCTEON services reads to its
+ * BAR1/BAR2. Refer to Section 10.6.1. The recommended values are
+ * 0x22, 0x33, and 0x33 for PCI_READ_CMD_6, PCI_READ_CMD_C, and
+ * PCI_READ_CMD_E, respectively. Unfortunately due to errata DDR-700,
+ * these values need to be changed so they won't possibly prefetch off
+ * of the end of memory if PCI is DMAing a buffer at the end of
+ * memory. Note that these values differ from their reset values.
+ */
+ octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_6, 0x21);
+ octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_C, 0x31);
+ octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_E, 0x31);
+}
+
+
+/*
+ * Initialize the Octeon PCI controller
+ */
+static int __init octeon_pci_setup(void)
+{
+ union cvmx_npi_mem_access_subidx mem_access;
+ int index;
+
+ /* Only these chips have PCI */
+ if (octeon_has_feature(OCTEON_FEATURE_PCIE))
+ return 0;
+
+ /* Point pcibios_map_irq() to the PCI version of it */
+ octeon_pcibios_map_irq = octeon_pci_pcibios_map_irq;
+
+ /* Only use the big bars on chips that support it */
+ if (OCTEON_IS_MODEL(OCTEON_CN31XX) ||
+ OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2) ||
+ OCTEON_IS_MODEL(OCTEON_CN38XX_PASS1))
+ octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_SMALL;
+ else
+ octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_BIG;
+
+ /* PCI I/O and PCI MEM values */
+ set_io_port_base(OCTEON_PCI_IOSPACE_BASE);
+ ioport_resource.start = 0;
+ ioport_resource.end = OCTEON_PCI_IOSPACE_SIZE - 1;
+ if (!octeon_is_pci_host()) {
+ pr_notice("Not in host mode, PCI Controller not initialized\n");
+ return 0;
+ }
+
+ pr_notice("%s Octeon big bar support\n",
+ (octeon_dma_bar_type ==
+ OCTEON_DMA_BAR_TYPE_BIG) ? "Enabling" : "Disabling");
+
+ octeon_pci_initialize();
+
+ mem_access.u64 = 0;
+ mem_access.s.esr = 1; /* Endian-Swap on read. */
+ mem_access.s.esw = 1; /* Endian-Swap on write. */
+ mem_access.s.nsr = 0; /* No-Snoop on read. */
+ mem_access.s.nsw = 0; /* No-Snoop on write. */
+ mem_access.s.ror = 0; /* Relax Read on read. */
+ mem_access.s.row = 0; /* Relax Order on write. */
+ mem_access.s.ba = 0; /* PCI Address bits [63:36]. */
+ cvmx_write_csr(CVMX_NPI_MEM_ACCESS_SUBID3, mem_access.u64);
+
+ /*
+ * Remap the Octeon BAR 2 above all 32 bit devices
+ * (0x8000000000ul). This is done here so it is remapped
+ * before the readl()'s below. We don't want BAR2 overlapping
+ * with BAR0/BAR1 during these reads.
+ */
+ octeon_npi_write32(CVMX_NPI_PCI_CFG08, 0);
+ octeon_npi_write32(CVMX_NPI_PCI_CFG09, 0x80);
+
+ /* Disable the BAR1 movable mappings */
+ for (index = 0; index < 32; index++)
+ octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 0);
+
+ if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
+ /* Remap the Octeon BAR 0 to 0-2GB */
+ octeon_npi_write32(CVMX_NPI_PCI_CFG04, 0);
+ octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);
+
+ /*
+ * Remap the Octeon BAR 1 to map 2GB-4GB (minus the
+ * BAR 1 hole).
+ */
+ octeon_npi_write32(CVMX_NPI_PCI_CFG06, 2ul << 30);
+ octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);
+
+ /* Devices go after BAR1 */
+ octeon_pci_mem_resource.start =
+ OCTEON_PCI_MEMSPACE_OFFSET + (4ul << 30) -
+ (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
+ octeon_pci_mem_resource.end =
+ octeon_pci_mem_resource.start + (1ul << 30);
+ } else {
+ /* Remap the Octeon BAR 0 to map 128MB-(128MB+4KB) */
+ octeon_npi_write32(CVMX_NPI_PCI_CFG04, 128ul << 20);
+ octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);
+
+ /* Remap the Octeon BAR 1 to map 0-128MB */
+ octeon_npi_write32(CVMX_NPI_PCI_CFG06, 0);
+ octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);
+
+ /* Devices go after BAR0 */
+ octeon_pci_mem_resource.start =
+ OCTEON_PCI_MEMSPACE_OFFSET + (128ul << 20) +
+ (4ul << 10);
+ octeon_pci_mem_resource.end =
+ octeon_pci_mem_resource.start + (1ul << 30);
+ }
+
+ register_pci_controller(&octeon_pci_controller);
+
+ /*
+ * Clear any errors that might be pending from before the bus
+ * was setup properly.
+ */
+ cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1);
+ return 0;
+}
+
+arch_initcall(octeon_pci_setup);