/*
* FPGA Manager Driver for Altera Arria/Cyclone/Stratix CvP
*
* Copyright (C) 2017 DENX Software Engineering
*
* Anatolij Gustschin <agust@denx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Manage Altera FPGA firmware using PCIe CvP.
* Firmware must be in binary "rbf" format.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sizes.h>
#define CVP_BAR 0 /* BAR used for data transfer in memory mode */
#define CVP_DUMMY_WR 244 /* dummy writes to clear CvP state machine */
#define TIMEOUT_US 2000 /* CVP STATUS timeout for USERMODE polling */
/* Vendor Specific Extended Capability Registers */
#define VSE_PCIE_EXT_CAP_ID 0x200
#define VSE_PCIE_EXT_CAP_ID_VAL 0x000b /* 16bit */
#define VSE_CVP_STATUS 0x21c /* 32bit */
#define VSE_CVP_STATUS_CFG_RDY BIT(18) /* CVP_CONFIG_READY */
#define VSE_CVP_STATUS_CFG_ERR BIT(19) /* CVP_CONFIG_ERROR */
#define VSE_CVP_STATUS_CVP_EN BIT(20) /* ctrl block is enabling CVP */
#define VSE_CVP_STATUS_USERMODE BIT(21) /* USERMODE */
#define VSE_CVP_STATUS_CFG_DONE BIT(23) /* CVP_CONFIG_DONE */
#define VSE_CVP_STATUS_PLD_CLK_IN_USE BIT(24) /* PLD_CLK_IN_USE */
#define VSE_CVP_MODE_CTRL 0x220 /* 32bit */
#define VSE_CVP_MODE_CTRL_CVP_MODE BIT(0) /* CVP (1) or normal mode (0) */
#define VSE_CVP_MODE_CTRL_HIP_CLK_SEL BIT(1) /* PMA (1) or fabric clock (0) */
#define VSE_CVP_MODE_CTRL_NUMCLKS_OFF 8 /* NUMCLKS bits offset */
#define VSE_CVP_MODE_CTRL_NUMCLKS_MASK GENMASK(15, 8)
#define VSE_CVP_DATA 0x228 /* 32bit */
#define VSE_CVP_PROG_CTRL 0x22c /* 32bit */
#define VSE_CVP_PROG_CTRL_CONFIG BIT(0)
#define VSE_CVP_PROG_CTRL_START_XFER BIT(1)
#define VSE_UNCOR_ERR_STATUS 0x234 /* 32bit */
#define VSE_UNCOR_ERR_CVP_CFG_ERR BIT(5) /* CVP_CONFIG_ERROR_LATCHED */
#define DRV_NAME "altera-cvp"
#define ALTERA_CVP_MGR_NAME "Altera CvP FPGA Manager"
/* Optional CvP config error status check for debugging */
static bool altera_cvp_chkcfg;
struct altera_cvp_conf {
struct fpga_manager *mgr;
struct pci_dev *pci_dev;
void __iomem *map;
void (*write_data)(struct altera_cvp_conf *, u32);
char mgr_name[64];
u8 numclks;
};
static enum fpga_mgr_states altera_cvp_state(struct fpga_manager *mgr)
{
struct altera_cvp_conf *conf = mgr->priv;
u32 status;
pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &status);
if (status & VSE_CVP_STATUS_CFG_DONE)
return FPGA_MGR_STATE_OPERATING;
if (status & VSE_CVP_STATUS_CVP_EN)
return FPGA_MGR_STATE_POWER_UP;
return FPGA_MGR_STATE_UNKNOWN;
}
static void altera_cvp_write_data_iomem(struct altera_cvp_conf *conf, u32 val)
{
writel(val, conf->map);
}
static void altera_cvp_write_data_config(struct altera_cvp_conf *conf, u32 val)
{
pci_write_config_dword(conf->pci_dev, VSE_CVP_DATA, val);
}
/* switches between CvP clock and internal clock */
static void altera_cvp_dummy_write(struct altera_cvp_conf *conf)
{
unsigned int i;
u32 val;
/* set 1 CVP clock cycle for every CVP Data Register Write */
pci_read_config_dword(conf->pci_dev, VSE_CVP_MODE_CTRL, &val);
val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK;
val |= 1 << VSE_CVP_MODE_CTRL_NUMCLKS_OFF;
pci_write_config_dword(conf->pci_dev, VSE_CVP_MODE_CTRL, val);
for (i = 0; i < CVP_DUMMY_WR; i++)
conf->write_data(conf, 0); /* dummy data, could be any value */
}
static int altera_cvp_wait_status(struct altera_cvp_conf *conf, u32 status_mask,
u32 status_val, int timeout_us)
{
unsigned int retries;
u32 val;
retries = timeout_us / 10;
if (timeout_us % 10)
retries++;
do {
pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &val);
if ((val & status_mask) == status_val)
return 0;
/* use small usleep value to re-check and break early */
usleep_range(10, 11);
} while (--retries);
return -ETIMEDOUT;
}
static int altera_cvp_teardown(struct fpga_manager *mgr,
struct fpga_image_info *info)
{
struct altera_cvp_conf *conf = mgr->priv;
struct pci_dev *pdev = conf->pci_dev;
int ret;
u32 val;
/* STEP 12 - reset START_XFER bit */
pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val);
val &= ~VSE_CVP_PROG_CTRL_START_XFER;
pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
/* STEP 13 - reset CVP_CONFIG bit */
val &= ~VSE_CVP_PROG_CTRL_CONFIG;
pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
/*
* STEP 14
* - set CVP_NUMCLKS to 1 and then issue CVP_DUMMY_WR dummy
* writes to the HIP
*/
altera_cvp_dummy_write(conf); /* from CVP clock to internal clock */
/* STEP 15 - poll CVP_CONFIG_READY bit for 0 with 10us timeout */
ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 0, 10);
if (ret)
dev_err(&mgr->dev, "CFG_RDY == 0 timeout\n");
return ret;
}
static int altera_cvp_write_init(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *buf, size_t count)
{
struct altera_cvp_conf *conf = mgr->priv;
struct pci_dev *pdev = conf->pci_dev;
u32 iflags, val;
int ret;
iflags = info ? info->flags : 0;
if (iflags & FPGA_MGR_PARTIAL_RECONFIG) {
dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
return -EINVAL;
}
/* Determine allowed clock to data ratio */
if (iflags & FPGA_MGR_COMPRESSED_BITSTREAM)
conf->numclks = 8; /* ratio for all compressed images */
else if (iflags & FPGA_MGR_ENCRYPTED_BITSTREAM)
conf->numclks = 4; /* for uncompressed and encrypted images */
else
conf->numclks = 1; /* for uncompressed and unencrypted images */
/* STEP 1 - read CVP status and check CVP_EN flag */
pci_read_config_dword(pdev, VSE_CVP_STATUS, &val);
if (!(val & VSE_CVP_STATUS_CVP_EN)) {
dev_err(&mgr->dev, "CVP mode off: 0x%04x\n", val);
return -ENODEV;
}
if (val & VSE_CVP_STATUS_CFG_RDY) {
dev_warn(&mgr->dev, "CvP already started, teardown first\n");
ret = altera_cvp_teardown(mgr, info);
if (ret)
return ret;
}
/*
* STEP 2
* - set HIP_CLK_SEL and CVP_MODE (must be set in the order mentioned)
*/
/* switch from fabric to PMA clock */
pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
val |= VSE_CVP_MODE_CTRL_HIP_CLK_SEL;
pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
/* set CVP mode */
pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
val |= VSE_CVP_MODE_CTRL_CVP_MODE;
pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
/*
* STEP 3
* - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP
*/
altera_cvp_dummy_write(conf);
/* STEP 4 - set CVP_CONFIG bit */
pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val);
/* request control block to begin transfer using CVP */
val |= VSE_CVP_PROG_CTRL_CONFIG;
pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
/* STEP 5 - poll CVP_CONFIG READY for 1 with 10us timeout */
ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY,
VSE_CVP_STATUS_CFG_RDY, 10);
if (ret) {
dev_warn(&mgr->dev, "CFG_RDY == 1 timeout\n");
return ret;
}
/*
* STEP 6
* - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP
*/
altera_cvp_dummy_write(conf);
/* STEP 7 - set START_XFER */
pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val);
val |= VSE_CVP_PROG_CTRL_START_XFER;
pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
/* STEP 8 - start transfer (set CVP_NUMCLKS for bitstream) */
pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK;
val |= conf->numclks << VSE_CVP_MODE_CTRL_NUMCLKS_OFF;
pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
return 0;
}
static inline int altera_cvp_chk_error(struct fpga_manager *mgr, size_t bytes)
{
struct altera_cvp_conf *conf = mgr->priv;
u32 val;
/* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */
pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &val);
if (val & VSE_CVP_STATUS_CFG_ERR) {
dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n",
bytes);
return -EPROTO;
}
return 0;
}
static int altera_cvp_write(struct fpga_manager *mgr, const char *buf,
size_t count)
{
struct altera_cvp_conf *conf = mgr->priv;
const u32 *data;
size_t done, remaining;
int status = 0;
u32 mask;
/* STEP 9 - write 32-bit data from RBF file to CVP data register */
data = (u32 *)buf;
remaining = count;
done = 0;
while (remaining >= 4) {
conf->write_data(conf, *data++);
done += 4;
remaining -= 4;
/*
* STEP 10 (optional) and STEP 11
* - check error flag
* - loop until data transfer completed
* Config images can be huge (more than 40 MiB), so
* only check after a new 4k data block has been written.
* This reduces the number of checks and speeds up the
* configuration process.
*/
if (altera_cvp_chkcfg && !(done % SZ_4K)) {
status = altera_cvp_chk_error(mgr, done);
if (status < 0)
return status;
}
}
/* write up to 3 trailing bytes, if any */
mask = BIT(remaining * 8) - 1;
if (mask)
conf->write_data(conf, *data & mask);
if (altera_cvp_chkcfg)
status = altera_cvp_chk_error(mgr, count);
return status;
}
static int altera_cvp_write_complete(struct fpga_manager *mgr,
struct fpga_image_info *info)
{
struct altera_cvp_conf *conf = mgr->priv;
struct pci_dev *pdev = conf->pci_dev;
int ret;
u32 mask;
u32 val;
ret = altera_cvp_teardown(mgr, info);
if (ret)
return ret;
/* STEP 16 - check CVP_CONFIG_ERROR_LATCHED bit */
pci_read_config_dword(pdev, VSE_UNCOR_ERR_STATUS, &val);
if (val & VSE_UNCOR_ERR_CVP_CFG_ERR) {
dev_err(&mgr->dev, "detected CVP_CONFIG_ERROR_LATCHED!\n");
return -EPROTO;
}
/* STEP 17 - reset CVP_MODE and HIP_CLK_SEL bit */
pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
val &= ~VSE_CVP_MODE_CTRL_HIP_CLK_SEL;
val &= ~VSE_CVP_MODE_CTRL_CVP_MODE;
pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
/* STEP 18 - poll PLD_CLK_IN_USE and USER_MODE bits */
mask = VSE_CVP_STATUS_PLD_CLK_IN_USE | VSE_CVP_STATUS_USERMODE;
ret = altera_cvp_wait_status(conf, mask, mask, TIMEOUT_US);
if (ret)
dev_err(&mgr->dev, "PLD_CLK_IN_USE|USERMODE timeout\n");
return ret;
}
static const struct fpga_manager_ops altera_cvp_ops = {
.state = altera_cvp_state,
.write_init = altera_cvp_write_init,
.write = altera_cvp_write,
.write_complete = altera_cvp_write_complete,
};
static ssize_t chkcfg_show(struct device_driver *dev, char *buf)
{
return snprintf(buf, 3, "%d\n", altera_cvp_chkcfg);
}
static ssize_t chkcfg_store(struct device_driver *drv, const char *buf,
size_t count)
{
int ret;
ret = kstrtobool(buf, &altera_cvp_chkcfg);
if (ret)
return ret;
return count;
}
static DRIVER_ATTR_RW(chkcfg);
static int altera_cvp_probe(struct pci_dev *pdev,
const struct pci_device_id *dev_id);
static void altera_cvp_remove(struct pci_dev *pdev);
static struct pci_device_id altera_cvp_id_tbl[] = {
{ PCI_VDEVICE(ALTERA, PCI_ANY_ID) },
{ }
};
MODULE_DEVICE_TABLE(pci, altera_cvp_id_tbl);
static struct pci_driver altera_cvp_driver = {
.name = DRV_NAME,
.id_table = altera_cvp_id_tbl,
.probe = altera_cvp_probe,
.remove = altera_cvp_remove,
};
static int altera_cvp_probe(struct pci_dev *pdev,
const struct pci_device_id *dev_id)
{
struct altera_cvp_conf *conf;
struct fpga_manager *mgr;
u16 cmd, val;
int ret;
/*
* First check if this is the expected FPGA device. PCI config
* space access works without enabling the PCI device, memory
* space access is enabled further down.
*/
pci_read_config_word(pdev, VSE_PCIE_EXT_CAP_ID, &val);
if (val != VSE_PCIE_EXT_CAP_ID_VAL) {
dev_err(&pdev->dev, "Wrong EXT_CAP_ID value 0x%x\n", val);
return -ENODEV;
}
conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL);
if (!conf)
return -ENOMEM;
/*
* Enable memory BAR access. We cannot use pci_enable_device() here
* because it will make the driver unusable with FPGA devices that
* have additional big IOMEM resources (e.g. 4GiB BARs) on 32-bit
* platform. Such BARs will not have an assigned address range and
* pci_enable_device() will fail, complaining about not claimed BAR,
* even if the concerned BAR is not needed for FPGA configuration
* at all. Thus, enable the device via PCI config space command.
*/
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
if (!(cmd & PCI_COMMAND_MEMORY)) {
cmd |= PCI_COMMAND_MEMORY;
pci_write_config_word(pdev, PCI_COMMAND, cmd);
}
ret = pci_request_region(pdev, CVP_BAR, "CVP");
if (ret) {
dev_err(&pdev->dev, "Requesting CVP BAR region failed\n");
goto err_disable;
}
conf->pci_dev = pdev;
conf->write_data = altera_cvp_write_data_iomem;
conf->map = pci_iomap(pdev, CVP_BAR, 0);
if (!conf->map) {
dev_warn(&pdev->dev, "Mapping CVP BAR failed\n");
conf->write_data = altera_cvp_write_data_config;
}
snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s @%s",
ALTERA_CVP_MGR_NAME, pci_name(pdev));
mgr = fpga_mgr_create(&pdev->dev, conf->mgr_name,
&altera_cvp_ops, conf);
if (!mgr) {
ret = -ENOMEM;
goto err_unmap;
}
pci_set_drvdata(pdev, mgr);
ret = fpga_mgr_register(mgr);
if (ret) {
fpga_mgr_free(mgr);
goto err_unmap;
}
ret = driver_create_file(&altera_cvp_driver.driver,
&driver_attr_chkcfg);
if (ret) {
dev_err(&pdev->dev, "Can't create sysfs chkcfg file\n");
fpga_mgr_unregister(mgr);
goto err_unmap;
}
return 0;
err_unmap:
pci_iounmap(pdev, conf->map);
pci_release_region(pdev, CVP_BAR);
err_disable:
cmd &= ~PCI_COMMAND_MEMORY;
pci_write_config_word(pdev, PCI_COMMAND, cmd);
return ret;
}
static void altera_cvp_remove(struct pci_dev *pdev)
{
struct fpga_manager *mgr = pci_get_drvdata(pdev);
struct altera_cvp_conf *conf = mgr->priv;
u16 cmd;
driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg);
fpga_mgr_unregister(mgr);
pci_iounmap(pdev, conf->map);
pci_release_region(pdev, CVP_BAR);
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
cmd &= ~PCI_COMMAND_MEMORY;
pci_write_config_word(pdev, PCI_COMMAND, cmd);
}
module_pci_driver(altera_cvp_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");
MODULE_DESCRIPTION("Module to load Altera FPGA over CvP");
