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linux/drivers/fpga/dfl-fme-mgr.c
Russ Weight 4ba0b2c294 fpga: mgr: Use standard dev_release for class driver 
The FPGA manager class driver data structure is being treated as a
managed resource instead of using the standard dev_release call-back
function to release the class data structure. This change removes
the managed resource code for the freeing of the class data structure
and combines the create() and register() functions into a single
register() or register_full() function.

The register_full() function accepts an info data structure to provide
flexibility in passing optional parameters. The register() function
supports the current parameter list for users that don't require the
use of optional parameters.

The devm_fpga_mgr_register() function is retained, and the
devm_fpga_mgr_register_full() function is added.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
2021-11-28 13:59:13 -08:00

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// SPDX-License-Identifier: GPL-2.0
/*
* FPGA Manager Driver for FPGA Management Engine (FME)
*
* Copyright (C) 2017-2018 Intel Corporation, Inc.
*
* Authors:
* Kang Luwei <luwei.kang@intel.com>
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
* Wu Hao <hao.wu@intel.com>
* Joseph Grecco <joe.grecco@intel.com>
* Enno Luebbers <enno.luebbers@intel.com>
* Tim Whisonant <tim.whisonant@intel.com>
* Ananda Ravuri <ananda.ravuri@intel.com>
* Christopher Rauer <christopher.rauer@intel.com>
* Henry Mitchel <henry.mitchel@intel.com>
*/
#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;
struct resource *res;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (pdata->ioaddr)
priv->ioaddr = pdata->ioaddr;
if (!priv->ioaddr) {
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->ioaddr = devm_ioremap_resource(dev, res);
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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