diff options
Diffstat (limited to 'drivers/fpga/altera-cvp.c')
| -rw-r--r-- | drivers/fpga/altera-cvp.c | 718 |
1 files changed, 718 insertions, 0 deletions
diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c new file mode 100644 index 0000000000..4ffb9da537 --- /dev/null +++ b/drivers/fpga/altera-cvp.c @@ -0,0 +1,718 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * FPGA Manager Driver for Altera Arria/Cyclone/Stratix CvP + * + * Copyright (C) 2017 DENX Software Engineering + * + * Anatolij Gustschin <agust@denx.de> + * + * 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 0x0 +#define VSE_PCIE_EXT_CAP_ID_VAL 0x000b /* 16bit */ + +#define VSE_CVP_STATUS 0x1c /* 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 0x20 /* 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 0x28 /* 32bit */ +#define VSE_CVP_PROG_CTRL 0x2c /* 32bit */ +#define VSE_CVP_PROG_CTRL_CONFIG BIT(0) +#define VSE_CVP_PROG_CTRL_START_XFER BIT(1) +#define VSE_CVP_PROG_CTRL_MASK GENMASK(1, 0) + +#define VSE_UNCOR_ERR_STATUS 0x34 /* 32bit */ +#define VSE_UNCOR_ERR_CVP_CFG_ERR BIT(5) /* CVP_CONFIG_ERROR_LATCHED */ + +#define V1_VSEC_OFFSET 0x200 /* Vendor Specific Offset V1 */ +/* V2 Defines */ +#define VSE_CVP_TX_CREDITS 0x49 /* 8bit */ + +#define V2_CREDIT_TIMEOUT_US 20000 +#define V2_CHECK_CREDIT_US 10 +#define V2_POLL_TIMEOUT_US 1000000 +#define V2_USER_TIMEOUT_US 500000 + +#define V1_POLL_TIMEOUT_US 10 + +#define DRV_NAME "altera-cvp" +#define ALTERA_CVP_MGR_NAME "Altera CvP FPGA Manager" + +/* Write block sizes */ +#define ALTERA_CVP_V1_SIZE 4 +#define ALTERA_CVP_V2_SIZE 4096 + +/* Optional CvP config error status check for debugging */ +static bool altera_cvp_chkcfg; + +struct cvp_priv; + +struct altera_cvp_conf { + struct fpga_manager *mgr; + struct pci_dev *pci_dev; + void __iomem *map; + void (*write_data)(struct altera_cvp_conf *conf, + u32 data); + char mgr_name[64]; + u8 numclks; + u32 sent_packets; + u32 vsec_offset; + const struct cvp_priv *priv; +}; + +struct cvp_priv { + void (*switch_clk)(struct altera_cvp_conf *conf); + int (*clear_state)(struct altera_cvp_conf *conf); + int (*wait_credit)(struct fpga_manager *mgr, u32 blocks); + size_t block_size; + int poll_time_us; + int user_time_us; +}; + +static int altera_read_config_byte(struct altera_cvp_conf *conf, + int where, u8 *val) +{ + return pci_read_config_byte(conf->pci_dev, conf->vsec_offset + where, + val); +} + +static int altera_read_config_dword(struct altera_cvp_conf *conf, + int where, u32 *val) +{ + return pci_read_config_dword(conf->pci_dev, conf->vsec_offset + where, + val); +} + +static int altera_write_config_dword(struct altera_cvp_conf *conf, + int where, u32 val) +{ + return pci_write_config_dword(conf->pci_dev, conf->vsec_offset + where, + val); +} + +static enum fpga_mgr_states altera_cvp_state(struct fpga_manager *mgr) +{ + struct altera_cvp_conf *conf = mgr->priv; + u32 status; + + altera_read_config_dword(conf, 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, conf->vsec_offset + 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 */ + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); + val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK; + val |= 1 << VSE_CVP_MODE_CTRL_NUMCLKS_OFF; + altera_write_config_dword(conf, 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 { + altera_read_config_dword(conf, 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_chk_error(struct fpga_manager *mgr, size_t bytes) +{ + struct altera_cvp_conf *conf = mgr->priv; + u32 val; + int ret; + + /* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */ + ret = altera_read_config_dword(conf, VSE_CVP_STATUS, &val); + if (ret || (val & VSE_CVP_STATUS_CFG_ERR)) { + dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n", + bytes); + return -EPROTO; + } + return 0; +} + +/* + * CvP Version2 Functions + * Recent Intel FPGAs use a credit mechanism to throttle incoming + * bitstreams and a different method of clearing the state. + */ + +static int altera_cvp_v2_clear_state(struct altera_cvp_conf *conf) +{ + u32 val; + int ret; + + /* Clear the START_XFER and CVP_CONFIG bits */ + ret = altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); + if (ret) { + dev_err(&conf->pci_dev->dev, + "Error reading CVP Program Control Register\n"); + return ret; + } + + val &= ~VSE_CVP_PROG_CTRL_MASK; + ret = altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); + if (ret) { + dev_err(&conf->pci_dev->dev, + "Error writing CVP Program Control Register\n"); + return ret; + } + + return altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 0, + conf->priv->poll_time_us); +} + +static int altera_cvp_v2_wait_for_credit(struct fpga_manager *mgr, + u32 blocks) +{ + u32 timeout = V2_CREDIT_TIMEOUT_US / V2_CHECK_CREDIT_US; + struct altera_cvp_conf *conf = mgr->priv; + int ret; + u8 val; + + do { + ret = altera_read_config_byte(conf, VSE_CVP_TX_CREDITS, &val); + if (ret) { + dev_err(&conf->pci_dev->dev, + "Error reading CVP Credit Register\n"); + return ret; + } + + /* Return if there is space in FIFO */ + if (val - (u8)conf->sent_packets) + return 0; + + ret = altera_cvp_chk_error(mgr, blocks * ALTERA_CVP_V2_SIZE); + if (ret) { + dev_err(&conf->pci_dev->dev, + "CE Bit error credit reg[0x%x]:sent[0x%x]\n", + val, conf->sent_packets); + return -EAGAIN; + } + + /* Limit the check credit byte traffic */ + usleep_range(V2_CHECK_CREDIT_US, V2_CHECK_CREDIT_US + 1); + } while (timeout--); + + dev_err(&conf->pci_dev->dev, "Timeout waiting for credit\n"); + return -ETIMEDOUT; +} + +static int altera_cvp_send_block(struct altera_cvp_conf *conf, + const u32 *data, size_t len) +{ + u32 mask, words = len / sizeof(u32); + int i, remainder; + + for (i = 0; i < words; i++) + conf->write_data(conf, *data++); + + /* write up to 3 trailing bytes, if any */ + remainder = len % sizeof(u32); + if (remainder) { + mask = BIT(remainder * 8) - 1; + if (mask) + conf->write_data(conf, *data & mask); + } + + return 0; +} + +static int altera_cvp_teardown(struct fpga_manager *mgr, + struct fpga_image_info *info) +{ + struct altera_cvp_conf *conf = mgr->priv; + int ret; + u32 val; + + /* STEP 12 - reset START_XFER bit */ + altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); + val &= ~VSE_CVP_PROG_CTRL_START_XFER; + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); + + /* STEP 13 - reset CVP_CONFIG bit */ + val &= ~VSE_CVP_PROG_CTRL_CONFIG; + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); + + /* + * STEP 14 + * - set CVP_NUMCLKS to 1 and then issue CVP_DUMMY_WR dummy + * writes to the HIP + */ + if (conf->priv->switch_clk) + conf->priv->switch_clk(conf); + + /* STEP 15 - poll CVP_CONFIG_READY bit for 0 with 10us timeout */ + ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 0, + conf->priv->poll_time_us); + 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; + 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 */ + altera_read_config_dword(conf, 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, tear down 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 */ + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); + val |= VSE_CVP_MODE_CTRL_HIP_CLK_SEL; + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); + + /* set CVP mode */ + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); + val |= VSE_CVP_MODE_CTRL_CVP_MODE; + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); + + /* + * STEP 3 + * - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP + */ + if (conf->priv->switch_clk) + conf->priv->switch_clk(conf); + + if (conf->priv->clear_state) { + ret = conf->priv->clear_state(conf); + if (ret) { + dev_err(&mgr->dev, "Problem clearing out state\n"); + return ret; + } + } + + conf->sent_packets = 0; + + /* STEP 4 - set CVP_CONFIG bit */ + altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); + /* request control block to begin transfer using CVP */ + val |= VSE_CVP_PROG_CTRL_CONFIG; + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); + + /* STEP 5 - poll CVP_CONFIG READY for 1 with timeout */ + ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, + VSE_CVP_STATUS_CFG_RDY, + conf->priv->poll_time_us); + 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 + */ + if (conf->priv->switch_clk) + conf->priv->switch_clk(conf); + + if (altera_cvp_chkcfg) { + ret = altera_cvp_chk_error(mgr, 0); + if (ret) { + dev_warn(&mgr->dev, "CFG_RDY == 1 timeout\n"); + return ret; + } + } + + /* STEP 7 - set START_XFER */ + altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); + val |= VSE_CVP_PROG_CTRL_START_XFER; + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); + + /* STEP 8 - start transfer (set CVP_NUMCLKS for bitstream) */ + if (conf->priv->switch_clk) { + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); + val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK; + val |= conf->numclks << VSE_CVP_MODE_CTRL_NUMCLKS_OFF; + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); + } + return 0; +} + +static int altera_cvp_write(struct fpga_manager *mgr, const char *buf, + size_t count) +{ + struct altera_cvp_conf *conf = mgr->priv; + size_t done, remaining, len; + const u32 *data; + int status = 0; + + /* STEP 9 - write 32-bit data from RBF file to CVP data register */ + data = (u32 *)buf; + remaining = count; + done = 0; + + while (remaining) { + /* Use credit throttling if available */ + if (conf->priv->wait_credit) { + status = conf->priv->wait_credit(mgr, done); + if (status) { + dev_err(&conf->pci_dev->dev, + "Wait Credit ERR: 0x%x\n", status); + return status; + } + } + + len = min(conf->priv->block_size, remaining); + altera_cvp_send_block(conf, data, len); + data += len / sizeof(u32); + done += len; + remaining -= len; + conf->sent_packets++; + + /* + * 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; + } + } + + 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; + u32 mask, val; + int ret; + + ret = altera_cvp_teardown(mgr, info); + if (ret) + return ret; + + /* STEP 16 - check CVP_CONFIG_ERROR_LATCHED bit */ + altera_read_config_dword(conf, 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 */ + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); + val &= ~VSE_CVP_MODE_CTRL_HIP_CLK_SEL; + val &= ~VSE_CVP_MODE_CTRL_CVP_MODE; + altera_write_config_dword(conf, 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, + conf->priv->user_time_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 const struct cvp_priv cvp_priv_v1 = { + .switch_clk = altera_cvp_dummy_write, + .block_size = ALTERA_CVP_V1_SIZE, + .poll_time_us = V1_POLL_TIMEOUT_US, + .user_time_us = TIMEOUT_US, +}; + +static const struct cvp_priv cvp_priv_v2 = { + .clear_state = altera_cvp_v2_clear_state, + .wait_credit = altera_cvp_v2_wait_for_credit, + .block_size = ALTERA_CVP_V2_SIZE, + .poll_time_us = V2_POLL_TIMEOUT_US, + .user_time_us = V2_USER_TIMEOUT_US, +}; + +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; + int ret, offset; + u16 cmd, val; + u32 regval; + + /* Discover the Vendor Specific Offset for this device */ + offset = pci_find_next_ext_capability(pdev, 0, PCI_EXT_CAP_ID_VNDR); + if (!offset) { + dev_err(&pdev->dev, "No Vendor Specific Offset.\n"); + return -ENODEV; + } + + /* + * 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, offset + 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; + } + + pci_read_config_dword(pdev, offset + VSE_CVP_STATUS, ®val); + if (!(regval & VSE_CVP_STATUS_CVP_EN)) { + dev_err(&pdev->dev, + "CVP is disabled for this device: CVP_STATUS Reg 0x%x\n", + regval); + return -ENODEV; + } + + conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL); + if (!conf) + return -ENOMEM; + + conf->vsec_offset = offset; + + /* + * 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; + + if (conf->vsec_offset == V1_VSEC_OFFSET) + conf->priv = &cvp_priv_v1; + else + conf->priv = &cvp_priv_v2; + + 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_register(&pdev->dev, conf->mgr_name, + &altera_cvp_ops, conf); + if (IS_ERR(mgr)) { + ret = PTR_ERR(mgr); + goto err_unmap; + } + + pci_set_drvdata(pdev, mgr); + + return 0; + +err_unmap: + if (conf->map) + 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; + + fpga_mgr_unregister(mgr); + if (conf->map) + 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); +} + +static int __init altera_cvp_init(void) +{ + int ret; + + ret = pci_register_driver(&altera_cvp_driver); + if (ret) + return ret; + + ret = driver_create_file(&altera_cvp_driver.driver, + &driver_attr_chkcfg); + if (ret) + pr_warn("Can't create sysfs chkcfg file\n"); + + return 0; +} + +static void __exit altera_cvp_exit(void) +{ + driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg); + pci_unregister_driver(&altera_cvp_driver); +} + +module_init(altera_cvp_init); +module_exit(altera_cvp_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>"); +MODULE_DESCRIPTION("Module to load Altera FPGA over CvP"); |