diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c new file mode 100644 index 000000000000..34c50987c377 --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c @@ -0,0 +1,426 @@ +/* + * Copyright (C) 2015-2017 Netronome Systems, Inc. + * + * This software is dual licensed under the GNU General License Version 2, + * June 1991 as shown in the file COPYING in the top-level directory of this + * source tree or the BSD 2-Clause License provided below. You have the + * option to license this software under the complete terms of either license. + * + * The BSD 2-Clause License: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * 2. Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +/* + * nfp_nsp.c + * Author: Jakub Kicinski <jakub.kicinski@netronome.com> + * Jason McMullan <jason.mcmullan@netronome.com> + */ + +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/firmware.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/sizes.h> +#include <linux/slab.h> + +#define NFP_SUBSYS "nfp_nsp" + +#include "nfp.h" +#include "nfp_cpp.h" + +/* Offsets relative to the CSR base */ +#define NSP_STATUS 0x00 +#define NSP_STATUS_MAGIC GENMASK_ULL(63, 48) +#define NSP_STATUS_MAJOR GENMASK_ULL(47, 44) +#define NSP_STATUS_MINOR GENMASK_ULL(43, 32) +#define NSP_STATUS_CODE GENMASK_ULL(31, 16) +#define NSP_STATUS_RESULT GENMASK_ULL(15, 8) +#define NSP_STATUS_BUSY BIT_ULL(0) + +#define NSP_COMMAND 0x08 +#define NSP_COMMAND_OPTION GENMASK_ULL(63, 32) +#define NSP_COMMAND_CODE GENMASK_ULL(31, 16) +#define NSP_COMMAND_START BIT_ULL(0) + +/* CPP address to retrieve the data from */ +#define NSP_BUFFER 0x10 +#define NSP_BUFFER_CPP GENMASK_ULL(63, 40) +#define NSP_BUFFER_PCIE GENMASK_ULL(39, 38) +#define NSP_BUFFER_ADDRESS GENMASK_ULL(37, 0) + +#define NSP_DFLT_BUFFER 0x18 + +#define NSP_DFLT_BUFFER_CONFIG 0x20 +#define NSP_DFLT_BUFFER_SIZE_MB GENMASK_ULL(7, 0) + +#define NSP_MAGIC 0xab10 +#define NSP_MAJOR 0 +#define NSP_MINOR (__MAX_SPCODE - 1) + +#define NSP_CODE_MAJOR GENMASK(15, 12) +#define NSP_CODE_MINOR GENMASK(11, 0) + +enum nfp_nsp_cmd { + SPCODE_NOOP = 0, /* No operation */ + SPCODE_SOFT_RESET = 1, /* Soft reset the NFP */ + SPCODE_FW_DEFAULT = 2, /* Load default (UNDI) FW */ + SPCODE_PHY_INIT = 3, /* Initialize the PHY */ + SPCODE_MAC_INIT = 4, /* Initialize the MAC */ + SPCODE_PHY_RXADAPT = 5, /* Re-run PHY RX Adaptation */ + SPCODE_FW_LOAD = 6, /* Load fw from buffer, len in option */ + SPCODE_ETH_RESCAN = 7, /* Rescan ETHs, write ETH_TABLE to buf */ + SPCODE_ETH_CONTROL = 8, /* Update media config from buffer */ + + __MAX_SPCODE, +}; + +struct nfp_nsp { + struct nfp_cpp *cpp; + struct nfp_resource *res; + struct { + u16 major; + u16 minor; + } ver; +}; + +static int nfp_nsp_check(struct nfp_nsp *state) +{ + struct nfp_cpp *cpp = state->cpp; + u64 nsp_status, reg; + u32 nsp_cpp; + int err; + + nsp_cpp = nfp_resource_cpp_id(state->res); + nsp_status = nfp_resource_address(state->res) + NSP_STATUS; + + err = nfp_cpp_readq(cpp, nsp_cpp, nsp_status, ®); + if (err < 0) + return err; + + if (FIELD_GET(NSP_STATUS_MAGIC, reg) != NSP_MAGIC) { + nfp_err(cpp, "Cannot detect NFP Service Processor\n"); + return -ENODEV; + } + + state->ver.major = FIELD_GET(NSP_STATUS_MAJOR, reg); + state->ver.minor = FIELD_GET(NSP_STATUS_MINOR, reg); + + if (state->ver.major != NSP_MAJOR || state->ver.minor < NSP_MINOR) { + nfp_err(cpp, "Unsupported ABI %hu.%hu\n", + state->ver.major, state->ver.minor); + return -EINVAL; + } + + if (reg & NSP_STATUS_BUSY) { + nfp_err(cpp, "Service processor busy!\n"); + return -EBUSY; + } + + return 0; +} + +/** + * nfp_nsp_open() - Prepare for communication and lock the NSP resource. + * @cpp: NFP CPP Handle + */ +struct nfp_nsp *nfp_nsp_open(struct nfp_cpp *cpp) +{ + struct nfp_resource *res; + struct nfp_nsp *state; + int err; + + res = nfp_resource_acquire(cpp, NFP_RESOURCE_NSP); + if (IS_ERR(res)) + return (void *)res; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) { + nfp_resource_release(res); + return ERR_PTR(-ENOMEM); + } + state->cpp = cpp; + state->res = res; + + err = nfp_nsp_check(state); + if (err) { + nfp_nsp_close(state); + return ERR_PTR(err); + } + + return state; +} + +/** + * nfp_nsp_close() - Clean up and unlock the NSP resource. + * @state: NFP SP state + */ +void nfp_nsp_close(struct nfp_nsp *state) +{ + nfp_resource_release(state->res); + kfree(state); +} + +u16 nfp_nsp_get_abi_ver_major(struct nfp_nsp *state) +{ + return state->ver.major; +} + +u16 nfp_nsp_get_abi_ver_minor(struct nfp_nsp *state) +{ + return state->ver.minor; +} + +static int +nfp_nsp_wait_reg(struct nfp_cpp *cpp, u64 *reg, + u32 nsp_cpp, u64 addr, u64 mask, u64 val) +{ + const unsigned long wait_until = jiffies + 30 * HZ; + int err; + + for (;;) { + const unsigned long start_time = jiffies; + + err = nfp_cpp_readq(cpp, nsp_cpp, addr, reg); + if (err < 0) + return err; + + if ((*reg & mask) == val) + return 0; + + err = msleep_interruptible(100); + if (err) + return err; + + if (time_after(start_time, wait_until)) + return -ETIMEDOUT; + } +} + +/** + * nfp_nsp_command() - Execute a command on the NFP Service Processor + * @state: NFP SP state + * @code: NFP SP Command Code + * @option: NFP SP Command Argument + * @buff_cpp: NFP SP Buffer CPP Address info + * @buff_addr: NFP SP Buffer Host address + * + * Return: 0 for success with no result + * + * 1..255 for NSP completion with a result code + * + * -EAGAIN if the NSP is not yet present + * -ENODEV if the NSP is not a supported model + * -EBUSY if the NSP is stuck + * -EINTR if interrupted while waiting for completion + * -ETIMEDOUT if the NSP took longer than 30 seconds to complete + */ +static int nfp_nsp_command(struct nfp_nsp *state, u16 code, u32 option, + u32 buff_cpp, u64 buff_addr) +{ + u64 reg, nsp_base, nsp_buffer, nsp_status, nsp_command; + struct nfp_cpp *cpp = state->cpp; + u32 nsp_cpp; + int err; + + nsp_cpp = nfp_resource_cpp_id(state->res); + nsp_base = nfp_resource_address(state->res); + nsp_status = nsp_base + NSP_STATUS; + nsp_command = nsp_base + NSP_COMMAND; + nsp_buffer = nsp_base + NSP_BUFFER; + + err = nfp_nsp_check(state); + if (err) + return err; + + if (!FIELD_FIT(NSP_BUFFER_CPP, buff_cpp >> 8) || + !FIELD_FIT(NSP_BUFFER_ADDRESS, buff_addr)) { + nfp_err(cpp, "Host buffer out of reach %08x %016llx\n", + buff_cpp, buff_addr); + return -EINVAL; + } + + err = nfp_cpp_writeq(cpp, nsp_cpp, nsp_buffer, + FIELD_PREP(NSP_BUFFER_CPP, buff_cpp >> 8) | + FIELD_PREP(NSP_BUFFER_ADDRESS, buff_addr)); + if (err < 0) + return err; + + err = nfp_cpp_writeq(cpp, nsp_cpp, nsp_command, + FIELD_PREP(NSP_COMMAND_OPTION, option) | + FIELD_PREP(NSP_COMMAND_CODE, code) | + FIELD_PREP(NSP_COMMAND_START, 1)); + if (err < 0) + return err; + + /* Wait for NSP_COMMAND_START to go to 0 */ + err = nfp_nsp_wait_reg(cpp, ®, + nsp_cpp, nsp_command, NSP_COMMAND_START, 0); + if (err) { + nfp_err(cpp, "Error %d waiting for code 0x%04x to start\n", + err, code); + return err; + } + + /* Wait for NSP_STATUS_BUSY to go to 0 */ + err = nfp_nsp_wait_reg(cpp, ®, + nsp_cpp, nsp_status, NSP_STATUS_BUSY, 0); + if (err) { + nfp_err(cpp, "Error %d waiting for code 0x%04x to complete\n", + err, code); + return err; + } + + err = FIELD_GET(NSP_STATUS_RESULT, reg); + if (err) { + nfp_warn(cpp, "Result (error) code set: %d command: %d\n", + -err, code); + return -err; + } + + err = nfp_cpp_readq(cpp, nsp_cpp, nsp_command, ®); + if (err < 0) + return err; + + return FIELD_GET(NSP_COMMAND_OPTION, reg); +} + +static int nfp_nsp_command_buf(struct nfp_nsp *nsp, u16 code, u32 option, + const void *in_buf, unsigned int in_size, + void *out_buf, unsigned int out_size) +{ + struct nfp_cpp *cpp = nsp->cpp; + unsigned int max_size; + u64 reg, cpp_buf; + int ret, err; + u32 cpp_id; + + if (nsp->ver.minor < 13) { + nfp_err(cpp, "NSP: Code 0x%04x with buffer not supported (ABI %hu.%hu)\n", + code, nsp->ver.major, nsp->ver.minor); + return -EOPNOTSUPP; + } + + err = nfp_cpp_readq(cpp, nfp_resource_cpp_id(nsp->res), + nfp_resource_address(nsp->res) + + NSP_DFLT_BUFFER_CONFIG, + ®); + if (err < 0) + return err; + + max_size = max(in_size, out_size); + if (FIELD_GET(NSP_DFLT_BUFFER_SIZE_MB, reg) * SZ_1M < max_size) { + nfp_err(cpp, "NSP: default buffer too small for command 0x%04x (%llu < %u)\n", + code, FIELD_GET(NSP_DFLT_BUFFER_SIZE_MB, reg) * SZ_1M, + max_size); + return -EINVAL; + } + + err = nfp_cpp_readq(cpp, nfp_resource_cpp_id(nsp->res), + nfp_resource_address(nsp->res) + + NSP_DFLT_BUFFER, + ®); + if (err < 0) + return err; + + cpp_id = FIELD_GET(NSP_BUFFER_CPP, reg) << 8; + cpp_buf = FIELD_GET(NSP_BUFFER_ADDRESS, reg); + + if (in_buf && in_size) { + err = nfp_cpp_write(cpp, cpp_id, cpp_buf, in_buf, in_size); + if (err < 0) + return err; + } + + ret = nfp_nsp_command(nsp, code, option, cpp_id, cpp_buf); + if (ret < 0) + return ret; + + if (out_buf && out_size) { + err = nfp_cpp_read(cpp, cpp_id, cpp_buf, out_buf, out_size); + if (err < 0) + return err; + } + + return ret; +} + +int nfp_nsp_wait(struct nfp_nsp *state) +{ + const unsigned long wait_until = jiffies + 30 * HZ; + int err; + + nfp_dbg(state->cpp, "Waiting for NSP to respond (30 sec max).\n"); + + for (;;) { + const unsigned long start_time = jiffies; + + err = nfp_nsp_command(state, SPCODE_NOOP, 0, 0, 0); + if (err != -EAGAIN) + break; + + err = msleep_interruptible(100); + if (err) + break; + + if (time_after(start_time, wait_until)) { + err = -ETIMEDOUT; + break; + } + } + if (err) + nfp_err(state->cpp, "NSP failed to respond %d\n", err); + + return err; +} + +int nfp_nsp_device_soft_reset(struct nfp_nsp *state) +{ + int err; + + err = nfp_nsp_command(state, SPCODE_SOFT_RESET, 0, 0, 0); + + nfp_nffw_cache_flush(state->cpp); + + return err; +} + +int nfp_nsp_load_fw(struct nfp_nsp *state, const struct firmware *fw) +{ + return nfp_nsp_command_buf(state, SPCODE_FW_LOAD, fw->size, fw->data, + fw->size, NULL, 0); +} + +int nfp_nsp_read_eth_table(struct nfp_nsp *state, void *buf, unsigned int size) +{ + return nfp_nsp_command_buf(state, SPCODE_ETH_RESCAN, size, NULL, 0, + buf, size); +} + +int nfp_nsp_write_eth_table(struct nfp_nsp *state, + const void *buf, unsigned int size) +{ + return nfp_nsp_command_buf(state, SPCODE_ETH_CONTROL, size, buf, size, + NULL, 0); +} |