130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <rte_log.h>
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#include "nfp_nfpu.h"
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#define CFG_EXP_BAR_ADDR_SZ 1
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#define CFG_EXP_BAR_MAP_TYPE 1
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#define EXP_BAR_TARGET_SHIFT 23
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#define EXP_BAR_LENGTH_SHIFT 27 /* 0=32, 1=64 bit increment */
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#define EXP_BAR_MAP_TYPE_SHIFT 29 /* Bulk BAR map */
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/* NFP target for NSP access */
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#define NFP_NSP_TARGET 7
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/*
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* This is an NFP internal address used for configuring properly an NFP
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* expansion BAR.
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*/
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#define MEM_CMD_BASE_ADDR 0x8100000000
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/* NSP interface registers */
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#define NSP_BASE (MEM_CMD_BASE_ADDR + 0x22100)
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#define NSP_STATUS 0x00
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#define NSP_COMMAND 0x08
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#define NSP_BUFFER 0x10
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#define NSP_DEFAULT_BUFFER 0x18
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#define NSP_DEFAULT_BUFFER_CFG 0x20
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#define NSP_MAGIC 0xab10
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#define NSP_STATUS_MAGIC(x) (((x) >> 48) & 0xffff)
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#define NSP_STATUS_MAJOR(x) (int)(((x) >> 44) & 0xf)
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#define NSP_STATUS_MINOR(x) (int)(((x) >> 32) & 0xfff)
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#define NSP_REG_ADDR(d, off, reg) ((uint8_t *)(d)->mem_base + (off) + (reg))
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#define NSP_REG_VAL(p) (*(uint64_t *)(p))
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/*
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* An NFP expansion BAR is configured for allowing access to a specific NFP
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* target:
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*
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* IN:
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* desc: struct with basic NSP addresses to work with
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* expbar: NFP PF expansion BAR index to configure
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* tgt: NFP target to configure access
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* addr: NFP target address
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*
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* OUT:
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* pcie_offset: NFP PCI BAR offset to work with
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*/
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static void
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nfp_nspu_mem_bar_cfg(nspu_desc_t *desc, int expbar, int tgt,
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uint64_t addr, uint64_t *pcie_offset)
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{
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uint64_t x, y, barsz;
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uint32_t *expbar_ptr;
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barsz = desc->barsz;
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/*
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* NFP CPP address to configure. This comes from NFP 6000
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* datasheet document based on Bulk mapping.
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*/
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x = (addr >> (barsz - 3)) << (21 - (40 - (barsz - 3)));
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x |= CFG_EXP_BAR_MAP_TYPE << EXP_BAR_MAP_TYPE_SHIFT;
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x |= CFG_EXP_BAR_ADDR_SZ << EXP_BAR_LENGTH_SHIFT;
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x |= tgt << EXP_BAR_TARGET_SHIFT;
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/* Getting expansion bar configuration register address */
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expbar_ptr = (uint32_t *)desc->cfg_base;
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/* Each physical PCI BAR has 8 NFP expansion BARs */
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expbar_ptr += (desc->pcie_bar * 8) + expbar;
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/* Writing to the expansion BAR register */
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*expbar_ptr = (uint32_t)x;
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/* Getting the pcie offset to work with from userspace */
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y = addr & ((uint64_t)(1 << (barsz - 3)) - 1);
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*pcie_offset = y;
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}
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/*
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* Configuring an expansion bar for accessing NSP userspace interface. This
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* function configures always the same expansion bar, which implies access to
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* previously configured NFP target is lost.
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*/
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static void
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nspu_xlate(nspu_desc_t *desc, uint64_t addr, uint64_t *pcie_offset)
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{
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nfp_nspu_mem_bar_cfg(desc, desc->exp_bar, NFP_NSP_TARGET, addr,
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pcie_offset);
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}
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int
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nfp_nsp_get_abi_version(nspu_desc_t *desc, int *major, int *minor)
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{
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uint64_t pcie_offset;
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uint64_t nsp_reg;
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nspu_xlate(desc, NSP_BASE, &pcie_offset);
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nsp_reg = NSP_REG_VAL(NSP_REG_ADDR(desc, pcie_offset, NSP_STATUS));
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if (NSP_STATUS_MAGIC(nsp_reg) != NSP_MAGIC)
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return -1;
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*major = NSP_STATUS_MAJOR(nsp_reg);
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*minor = NSP_STATUS_MINOR(nsp_reg);
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return 0;
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}
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int
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nfp_nspu_init(nspu_desc_t *desc, int nfp, int pcie_bar, size_t pcie_barsz,
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int exp_bar, void *exp_bar_cfg_base, void *exp_bar_mmap)
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{
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desc->nfp = nfp;
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desc->pcie_bar = pcie_bar;
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desc->exp_bar = exp_bar;
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desc->barsz = pcie_barsz;
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desc->cfg_base = exp_bar_cfg_base;
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desc->mem_base = exp_bar_mmap;
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return 0;
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}
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