// SPDX-License-Identifier: GPL-2.0
/*
* FPGA Manager Driver for FPGA Management Engine (FME)
*
* Copyright (C) 2017-2018 Intel Corporation, Inc.
*
* Authors:
* Kang Luwei <[email protected]>
* Xiao Guangrong <[email protected]>
* Wu Hao <[email protected]>
* Joseph Grecco <[email protected]>
* Enno Luebbers <[email protected]>
* Tim Whisonant <[email protected]>
* Ananda Ravuri <[email protected]>
* Christopher Rauer <[email protected]>
* Henry Mitchel <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/iopoll.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/fpga/fpga-mgr.h>
#include "dfl-fme-pr.h"
/* FME Partial Reconfiguration Sub Feature Register Set */
#define FME_PR_DFH 0x0
#define FME_PR_CTRL 0x8
#define FME_PR_STS 0x10
#define FME_PR_DATA 0x18
#define FME_PR_ERR 0x20
#define FME_PR_INTFC_ID_L 0xA8
#define FME_PR_INTFC_ID_H 0xB0
/* FME PR Control Register Bitfield */
#define FME_PR_CTRL_PR_RST BIT_ULL(0) /* Reset PR engine */
#define FME_PR_CTRL_PR_RSTACK BIT_ULL(4) /* Ack for PR engine reset */
#define FME_PR_CTRL_PR_RGN_ID GENMASK_ULL(9, 7) /* PR Region ID */
#define FME_PR_CTRL_PR_START BIT_ULL(12) /* Start to request PR service */
#define FME_PR_CTRL_PR_COMPLETE BIT_ULL(13) /* PR data push completion */
/* FME PR Status Register Bitfield */
/* Number of available entries in HW queue inside the PR engine. */
#define FME_PR_STS_PR_CREDIT GENMASK_ULL(8, 0)
#define FME_PR_STS_PR_STS BIT_ULL(16) /* PR operation status */
#define FME_PR_STS_PR_STS_IDLE 0
#define FME_PR_STS_PR_CTRLR_STS GENMASK_ULL(22, 20) /* Controller status */
#define FME_PR_STS_PR_HOST_STS GENMASK_ULL(27, 24) /* PR host status */
/* FME PR Data Register Bitfield */
/* PR data from the raw-binary file. */
#define FME_PR_DATA_PR_DATA_RAW GENMASK_ULL(32, 0)
/* FME PR Error Register */
/* PR Operation errors detected. */
#define FME_PR_ERR_OPERATION_ERR BIT_ULL(0)
/* CRC error detected. */
#define FME_PR_ERR_CRC_ERR BIT_ULL(1)
/* Incompatible PR bitstream detected. */
#define FME_PR_ERR_INCOMPATIBLE_BS BIT_ULL(2)
/* PR data push protocol violated. */
#define FME_PR_ERR_PROTOCOL_ERR BIT_ULL(3)
/* PR data fifo overflow error detected */
#define FME_PR_ERR_FIFO_OVERFLOW BIT_ULL(4)
#define PR_WAIT_TIMEOUT 8000000
#define PR_HOST_STATUS_IDLE 0
struct fme_mgr_priv {
void __iomem *ioaddr;
u64 pr_error;
};
static u64 pr_error_to_mgr_status(u64 err)
{
u64 status = 0;
if (err & FME_PR_ERR_OPERATION_ERR)
status |= FPGA_MGR_STATUS_OPERATION_ERR;
if (err & FME_PR_ERR_CRC_ERR)
status |= FPGA_MGR_STATUS_CRC_ERR;
if (err & FME_PR_ERR_INCOMPATIBLE_BS)
status |= FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR;
if (err & FME_PR_ERR_PROTOCOL_ERR)
status |= FPGA_MGR_STATUS_IP_PROTOCOL_ERR;
if (err & FME_PR_ERR_FIFO_OVERFLOW)
status |= FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR;
return status;
}
static u64 fme_mgr_pr_error_handle(void __iomem *fme_pr)
{
u64 pr_status, pr_error;
pr_status = readq(fme_pr + FME_PR_STS);
if (!(pr_status & FME_PR_STS_PR_STS))
return 0;
pr_error = readq(fme_pr + FME_PR_ERR);
writeq(pr_error, fme_pr + FME_PR_ERR);
return pr_error;
}
static int fme_mgr_write_init(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *buf, size_t count)
{
struct device *dev = &mgr->dev;
struct fme_mgr_priv *priv = mgr->priv;
void __iomem *fme_pr = priv->ioaddr;
u64 pr_ctrl, pr_status;
if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
dev_err(dev, "only supports partial reconfiguration.\n");
return -EINVAL;
}
dev_dbg(dev, "resetting PR before initiated PR\n");
pr_ctrl = readq(fme_pr + FME_PR_CTRL);
pr_ctrl |= FME_PR_CTRL_PR_RST;
writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
if (readq_poll_timeout(fme_pr + FME_PR_CTRL, pr_ctrl,
pr_ctrl & FME_PR_CTRL_PR_RSTACK, 1,
PR_WAIT_TIMEOUT)) {
dev_err(dev, "PR Reset ACK timeout\n");
return -ETIMEDOUT;
}
pr_ctrl = readq(fme_pr + FME_PR_CTRL);
pr_ctrl &= ~FME_PR_CTRL_PR_RST;
writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
dev_dbg(dev,
"waiting for PR resource in HW to be initialized and ready\n");
if (readq_poll_timeout(fme_pr + FME_PR_STS, pr_status,
(pr_status & FME_PR_STS_PR_STS) ==
FME_PR_STS_PR_STS_IDLE, 1, PR_WAIT_TIMEOUT)) {
dev_err(dev, "PR Status timeout\n");
priv->pr_error = fme_mgr_pr_error_handle(fme_pr);
return -ETIMEDOUT;
}
dev_dbg(dev, "check and clear previous PR error\n");
priv->pr_error = fme_mgr_pr_error_handle(fme_pr);
if (priv->pr_error)
dev_dbg(dev, "previous PR error detected %llx\n",
(unsigned long long)priv->pr_error);
dev_dbg(dev, "set PR port ID\n");
pr_ctrl = readq(fme_pr + FME_PR_CTRL);
pr_ctrl &= ~FME_PR_CTRL_PR_RGN_ID;
pr_ctrl |= FIELD_PREP(FME_PR_CTRL_PR_RGN_ID, info->region_id);
writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
return 0;
}
static int fme_mgr_write(struct fpga_manager *mgr,
const char *buf, size_t count)
{
struct device *dev = &mgr->dev;
struct fme_mgr_priv *priv = mgr->priv;
void __iomem *fme_pr = priv->ioaddr;
u64 pr_ctrl, pr_status, pr_data;
int delay = 0, pr_credit, i = 0;
dev_dbg(dev, "start request\n");
pr_ctrl = readq(fme_pr + FME_PR_CTRL);
pr_ctrl |= FME_PR_CTRL_PR_START;
writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
dev_dbg(dev, "pushing data from bitstream to HW\n");
/*
* driver can push data to PR hardware using PR_DATA register once HW
* has enough pr_credit (> 1), pr_credit reduces one for every 32bit
* pr data write to PR_DATA register. If pr_credit <= 1, driver needs
* to wait for enough pr_credit from hardware by polling.
*/
pr_status = readq(fme_pr + FME_PR_STS);
pr_credit = FIELD_GET(FME_PR_STS_PR_CREDIT, pr_status);
while (count > 0) {
while (pr_credit <= 1) {
if (delay++ > PR_WAIT_TIMEOUT) {
dev_err(dev, "PR_CREDIT timeout\n");
return -ETIMEDOUT;
}
udelay(1);
pr_status = readq(fme_pr + FME_PR_STS);
pr_credit = FIELD_GET(FME_PR_STS_PR_CREDIT, pr_status);
}
if (count < 4) {
dev_err(dev, "Invalid PR bitstream size\n");
return -EINVAL;
}
pr_data = 0;
pr_data |= FIELD_PREP(FME_PR_DATA_PR_DATA_RAW,
*(((u32 *)buf) + i));
writeq(pr_data, fme_pr + FME_PR_DATA);
count -= 4;
pr_credit--;
i++;
}
return 0;
}
static int fme_mgr_write_complete(struct fpga_manager *mgr,
struct fpga_image_info *info)
{
struct device *dev = &mgr->dev;
struct fme_mgr_priv *priv = mgr->priv;
void __iomem *fme_pr = priv->ioaddr;
u64 pr_ctrl;
pr_ctrl = readq(fme_pr + FME_PR_CTRL);
pr_ctrl |= FME_PR_CTRL_PR_COMPLETE;
writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
dev_dbg(dev, "green bitstream push complete\n");
dev_dbg(dev, "waiting for HW to release PR resource\n");
if (readq_poll_timeout(fme_pr + FME_PR_CTRL, pr_ctrl,
!(pr_ctrl & FME_PR_CTRL_PR_START), 1,
PR_WAIT_TIMEOUT)) {
dev_err(dev, "PR Completion ACK timeout.\n");
return -ETIMEDOUT;
}
dev_dbg(dev, "PR operation complete, checking status\n");
priv->pr_error = fme_mgr_pr_error_handle(fme_pr);
if (priv->pr_error) {
dev_dbg(dev, "PR error detected %llx\n",
(unsigned long long)priv->pr_error);
return -EIO;
}
dev_dbg(dev, "PR done successfully\n");
return 0;
}
static u64 fme_mgr_status(struct fpga_manager *mgr)
{
struct fme_mgr_priv *priv = mgr->priv;
return pr_error_to_mgr_status(priv->pr_error);
}
static const struct fpga_manager_ops fme_mgr_ops = {
.write_init = fme_mgr_write_init,
.write = fme_mgr_write,
.write_complete = fme_mgr_write_complete,
.status = fme_mgr_status,
};
static void fme_mgr_get_compat_id(void __iomem *fme_pr,
struct fpga_compat_id *id)
{
id->id_l = readq(fme_pr + FME_PR_INTFC_ID_L);
id->id_h = readq(fme_pr + FME_PR_INTFC_ID_H);
}
static int fme_mgr_probe(struct platform_device *pdev)
{
struct dfl_fme_mgr_pdata *pdata = dev_get_platdata(&pdev->dev);
struct fpga_manager_info info = { 0 };
struct device *dev = &pdev->dev;
struct fme_mgr_priv *priv;
struct fpga_manager *mgr;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (pdata->ioaddr)
priv->ioaddr = pdata->ioaddr;
if (!priv->ioaddr) {
priv->ioaddr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->ioaddr))
return PTR_ERR(priv->ioaddr);
}
info.name = "DFL FME FPGA Manager";
info.mops = &fme_mgr_ops;
info.priv = priv;
info.compat_id = devm_kzalloc(dev, sizeof(*info.compat_id), GFP_KERNEL);
if (!info.compat_id)
return -ENOMEM;
fme_mgr_get_compat_id(priv->ioaddr, info.compat_id);
mgr = devm_fpga_mgr_register_full(dev, &info);
return PTR_ERR_OR_ZERO(mgr);
}
static struct platform_driver fme_mgr_driver = {
.driver = {
.name = DFL_FPGA_FME_MGR,
},
.probe = fme_mgr_probe,
};
module_platform_driver(fme_mgr_driver);
MODULE_DESCRIPTION("FPGA Manager for DFL FPGA Management Engine");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:dfl-fme-mgr");
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