diff options
Diffstat (limited to 'kernel/drivers/fpga')
| -rw-r--r-- | kernel/drivers/fpga/Kconfig | 29 | ||||
| -rw-r--r-- | kernel/drivers/fpga/Makefile | 10 | ||||
| -rw-r--r-- | kernel/drivers/fpga/fpga-mgr.c | 375 | ||||
| -rw-r--r-- | kernel/drivers/fpga/socfpga.c | 616 | ||||
| -rw-r--r-- | kernel/drivers/fpga/zynq-fpga.c | 514 |
5 files changed, 1544 insertions, 0 deletions
diff --git a/kernel/drivers/fpga/Kconfig b/kernel/drivers/fpga/Kconfig new file mode 100644 index 000000000..c9b9fdf6c --- /dev/null +++ b/kernel/drivers/fpga/Kconfig @@ -0,0 +1,29 @@ +# +# FPGA framework configuration +# + +menu "FPGA Configuration Support" + +config FPGA + tristate "FPGA Configuration Framework" + help + Say Y here if you want support for configuring FPGAs from the + kernel. The FPGA framework adds a FPGA manager class and FPGA + manager drivers. + +if FPGA + +config FPGA_MGR_SOCFPGA + tristate "Altera SOCFPGA FPGA Manager" + depends on ARCH_SOCFPGA + help + FPGA manager driver support for Altera SOCFPGA. + +config FPGA_MGR_ZYNQ_FPGA + tristate "Xilinx Zynq FPGA" + help + FPGA manager driver support for Xilinx Zynq FPGAs. + +endif # FPGA + +endmenu diff --git a/kernel/drivers/fpga/Makefile b/kernel/drivers/fpga/Makefile new file mode 100644 index 000000000..8d83fc6b1 --- /dev/null +++ b/kernel/drivers/fpga/Makefile @@ -0,0 +1,10 @@ +# +# Makefile for the fpga framework and fpga manager drivers. +# + +# Core FPGA Manager Framework +obj-$(CONFIG_FPGA) += fpga-mgr.o + +# FPGA Manager Drivers +obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o +obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o diff --git a/kernel/drivers/fpga/fpga-mgr.c b/kernel/drivers/fpga/fpga-mgr.c new file mode 100644 index 000000000..953dc9195 --- /dev/null +++ b/kernel/drivers/fpga/fpga-mgr.c @@ -0,0 +1,375 @@ +/* + * FPGA Manager Core + * + * Copyright (C) 2013-2015 Altera Corporation + * + * With code from the mailing list: + * Copyright (C) 2013 Xilinx, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/firmware.h> +#include <linux/fpga/fpga-mgr.h> +#include <linux/idr.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/mutex.h> +#include <linux/slab.h> + +static DEFINE_IDA(fpga_mgr_ida); +static struct class *fpga_mgr_class; + +/** + * fpga_mgr_buf_load - load fpga from image in buffer + * @mgr: fpga manager + * @flags: flags setting fpga confuration modes + * @buf: buffer contain fpga image + * @count: byte count of buf + * + * Step the low level fpga manager through the device-specific steps of getting + * an FPGA ready to be configured, writing the image to it, then doing whatever + * post-configuration steps necessary. This code assumes the caller got the + * mgr pointer from of_fpga_mgr_get() and checked that it is not an error code. + * + * Return: 0 on success, negative error code otherwise. + */ +int fpga_mgr_buf_load(struct fpga_manager *mgr, u32 flags, const char *buf, + size_t count) +{ + struct device *dev = &mgr->dev; + int ret; + + /* + * Call the low level driver's write_init function. This will do the + * device-specific things to get the FPGA into the state where it is + * ready to receive an FPGA image. + */ + mgr->state = FPGA_MGR_STATE_WRITE_INIT; + ret = mgr->mops->write_init(mgr, flags, buf, count); + if (ret) { + dev_err(dev, "Error preparing FPGA for writing\n"); + mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR; + return ret; + } + + /* + * Write the FPGA image to the FPGA. + */ + mgr->state = FPGA_MGR_STATE_WRITE; + ret = mgr->mops->write(mgr, buf, count); + if (ret) { + dev_err(dev, "Error while writing image data to FPGA\n"); + mgr->state = FPGA_MGR_STATE_WRITE_ERR; + return ret; + } + + /* + * After all the FPGA image has been written, do the device specific + * steps to finish and set the FPGA into operating mode. + */ + mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE; + ret = mgr->mops->write_complete(mgr, flags); + if (ret) { + dev_err(dev, "Error after writing image data to FPGA\n"); + mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE_ERR; + return ret; + } + mgr->state = FPGA_MGR_STATE_OPERATING; + + return 0; +} +EXPORT_SYMBOL_GPL(fpga_mgr_buf_load); + +/** + * fpga_mgr_firmware_load - request firmware and load to fpga + * @mgr: fpga manager + * @flags: flags setting fpga confuration modes + * @image_name: name of image file on the firmware search path + * + * Request an FPGA image using the firmware class, then write out to the FPGA. + * Update the state before each step to provide info on what step failed if + * there is a failure. This code assumes the caller got the mgr pointer + * from of_fpga_mgr_get() and checked that it is not an error code. + * + * Return: 0 on success, negative error code otherwise. + */ +int fpga_mgr_firmware_load(struct fpga_manager *mgr, u32 flags, + const char *image_name) +{ + struct device *dev = &mgr->dev; + const struct firmware *fw; + int ret; + + dev_info(dev, "writing %s to %s\n", image_name, mgr->name); + + mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ; + + ret = request_firmware(&fw, image_name, dev); + if (ret) { + mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ_ERR; + dev_err(dev, "Error requesting firmware %s\n", image_name); + return ret; + } + + ret = fpga_mgr_buf_load(mgr, flags, fw->data, fw->size); + + release_firmware(fw); + + return ret; +} +EXPORT_SYMBOL_GPL(fpga_mgr_firmware_load); + +static const char * const state_str[] = { + [FPGA_MGR_STATE_UNKNOWN] = "unknown", + [FPGA_MGR_STATE_POWER_OFF] = "power off", + [FPGA_MGR_STATE_POWER_UP] = "power up", + [FPGA_MGR_STATE_RESET] = "reset", + + /* requesting FPGA image from firmware */ + [FPGA_MGR_STATE_FIRMWARE_REQ] = "firmware request", + [FPGA_MGR_STATE_FIRMWARE_REQ_ERR] = "firmware request error", + + /* Preparing FPGA to receive image */ + [FPGA_MGR_STATE_WRITE_INIT] = "write init", + [FPGA_MGR_STATE_WRITE_INIT_ERR] = "write init error", + + /* Writing image to FPGA */ + [FPGA_MGR_STATE_WRITE] = "write", + [FPGA_MGR_STATE_WRITE_ERR] = "write error", + + /* Finishing configuration after image has been written */ + [FPGA_MGR_STATE_WRITE_COMPLETE] = "write complete", + [FPGA_MGR_STATE_WRITE_COMPLETE_ERR] = "write complete error", + + /* FPGA reports to be in normal operating mode */ + [FPGA_MGR_STATE_OPERATING] = "operating", +}; + +static ssize_t name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct fpga_manager *mgr = to_fpga_manager(dev); + + return sprintf(buf, "%s\n", mgr->name); +} + +static ssize_t state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct fpga_manager *mgr = to_fpga_manager(dev); + + return sprintf(buf, "%s\n", state_str[mgr->state]); +} + +static DEVICE_ATTR_RO(name); +static DEVICE_ATTR_RO(state); + +static struct attribute *fpga_mgr_attrs[] = { + &dev_attr_name.attr, + &dev_attr_state.attr, + NULL, +}; +ATTRIBUTE_GROUPS(fpga_mgr); + +static int fpga_mgr_of_node_match(struct device *dev, const void *data) +{ + return dev->of_node == data; +} + +/** + * of_fpga_mgr_get - get an exclusive reference to a fpga mgr + * @node: device node + * + * Given a device node, get an exclusive reference to a fpga mgr. + * + * Return: fpga manager struct or IS_ERR() condition containing error code. + */ +struct fpga_manager *of_fpga_mgr_get(struct device_node *node) +{ + struct fpga_manager *mgr; + struct device *dev; + int ret = -ENODEV; + + dev = class_find_device(fpga_mgr_class, NULL, node, + fpga_mgr_of_node_match); + if (!dev) + return ERR_PTR(-ENODEV); + + mgr = to_fpga_manager(dev); + if (!mgr) + goto err_dev; + + /* Get exclusive use of fpga manager */ + if (!mutex_trylock(&mgr->ref_mutex)) { + ret = -EBUSY; + goto err_dev; + } + + if (!try_module_get(dev->parent->driver->owner)) + goto err_ll_mod; + + return mgr; + +err_ll_mod: + mutex_unlock(&mgr->ref_mutex); +err_dev: + put_device(dev); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(of_fpga_mgr_get); + +/** + * fpga_mgr_put - release a reference to a fpga manager + * @mgr: fpga manager structure + */ +void fpga_mgr_put(struct fpga_manager *mgr) +{ + module_put(mgr->dev.parent->driver->owner); + mutex_unlock(&mgr->ref_mutex); + put_device(&mgr->dev); +} +EXPORT_SYMBOL_GPL(fpga_mgr_put); + +/** + * fpga_mgr_register - register a low level fpga manager driver + * @dev: fpga manager device from pdev + * @name: fpga manager name + * @mops: pointer to structure of fpga manager ops + * @priv: fpga manager private data + * + * Return: 0 on success, negative error code otherwise. + */ +int fpga_mgr_register(struct device *dev, const char *name, + const struct fpga_manager_ops *mops, + void *priv) +{ + struct fpga_manager *mgr; + int id, ret; + + if (!mops || !mops->write_init || !mops->write || + !mops->write_complete || !mops->state) { + dev_err(dev, "Attempt to register without fpga_manager_ops\n"); + return -EINVAL; + } + + if (!name || !strlen(name)) { + dev_err(dev, "Attempt to register with no name!\n"); + return -EINVAL; + } + + mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); + if (!mgr) + return -ENOMEM; + + id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL); + if (id < 0) { + ret = id; + goto error_kfree; + } + + mutex_init(&mgr->ref_mutex); + + mgr->name = name; + mgr->mops = mops; + mgr->priv = priv; + + /* + * Initialize framework state by requesting low level driver read state + * from device. FPGA may be in reset mode or may have been programmed + * by bootloader or EEPROM. + */ + mgr->state = mgr->mops->state(mgr); + + device_initialize(&mgr->dev); + mgr->dev.class = fpga_mgr_class; + mgr->dev.parent = dev; + mgr->dev.of_node = dev->of_node; + mgr->dev.id = id; + dev_set_drvdata(dev, mgr); + + ret = dev_set_name(&mgr->dev, "fpga%d", id); + if (ret) + goto error_device; + + ret = device_add(&mgr->dev); + if (ret) + goto error_device; + + dev_info(&mgr->dev, "%s registered\n", mgr->name); + + return 0; + +error_device: + ida_simple_remove(&fpga_mgr_ida, id); +error_kfree: + kfree(mgr); + + return ret; +} +EXPORT_SYMBOL_GPL(fpga_mgr_register); + +/** + * fpga_mgr_unregister - unregister a low level fpga manager driver + * @dev: fpga manager device from pdev + */ +void fpga_mgr_unregister(struct device *dev) +{ + struct fpga_manager *mgr = dev_get_drvdata(dev); + + dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name); + + /* + * If the low level driver provides a method for putting fpga into + * a desired state upon unregister, do it. + */ + if (mgr->mops->fpga_remove) + mgr->mops->fpga_remove(mgr); + + device_unregister(&mgr->dev); +} +EXPORT_SYMBOL_GPL(fpga_mgr_unregister); + +static void fpga_mgr_dev_release(struct device *dev) +{ + struct fpga_manager *mgr = to_fpga_manager(dev); + + ida_simple_remove(&fpga_mgr_ida, mgr->dev.id); + kfree(mgr); +} + +static int __init fpga_mgr_class_init(void) +{ + pr_info("FPGA manager framework\n"); + + fpga_mgr_class = class_create(THIS_MODULE, "fpga_manager"); + if (IS_ERR(fpga_mgr_class)) + return PTR_ERR(fpga_mgr_class); + + fpga_mgr_class->dev_groups = fpga_mgr_groups; + fpga_mgr_class->dev_release = fpga_mgr_dev_release; + + return 0; +} + +static void __exit fpga_mgr_class_exit(void) +{ + class_destroy(fpga_mgr_class); + ida_destroy(&fpga_mgr_ida); +} + +MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>"); +MODULE_DESCRIPTION("FPGA manager framework"); +MODULE_LICENSE("GPL v2"); + +subsys_initcall(fpga_mgr_class_init); +module_exit(fpga_mgr_class_exit); diff --git a/kernel/drivers/fpga/socfpga.c b/kernel/drivers/fpga/socfpga.c new file mode 100644 index 000000000..27d2ff281 --- /dev/null +++ b/kernel/drivers/fpga/socfpga.c @@ -0,0 +1,616 @@ +/* + * FPGA Manager Driver for Altera SOCFPGA + * + * Copyright (C) 2013-2015 Altera Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/fpga/fpga-mgr.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/pm.h> + +/* Register offsets */ +#define SOCFPGA_FPGMGR_STAT_OFST 0x0 +#define SOCFPGA_FPGMGR_CTL_OFST 0x4 +#define SOCFPGA_FPGMGR_DCLKCNT_OFST 0x8 +#define SOCFPGA_FPGMGR_DCLKSTAT_OFST 0xc +#define SOCFPGA_FPGMGR_GPIO_INTEN_OFST 0x830 +#define SOCFPGA_FPGMGR_GPIO_INTMSK_OFST 0x834 +#define SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST 0x838 +#define SOCFPGA_FPGMGR_GPIO_INT_POL_OFST 0x83c +#define SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST 0x840 +#define SOCFPGA_FPGMGR_GPIO_RAW_INTSTAT_OFST 0x844 +#define SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST 0x84c +#define SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST 0x850 + +/* Register bit defines */ +/* SOCFPGA_FPGMGR_STAT register mode field values */ +#define SOCFPGA_FPGMGR_STAT_POWER_UP 0x0 /*ramping*/ +#define SOCFPGA_FPGMGR_STAT_RESET 0x1 +#define SOCFPGA_FPGMGR_STAT_CFG 0x2 +#define SOCFPGA_FPGMGR_STAT_INIT 0x3 +#define SOCFPGA_FPGMGR_STAT_USER_MODE 0x4 +#define SOCFPGA_FPGMGR_STAT_UNKNOWN 0x5 +#define SOCFPGA_FPGMGR_STAT_STATE_MASK 0x7 +/* This is a flag value that doesn't really happen in this register field */ +#define SOCFPGA_FPGMGR_STAT_POWER_OFF 0x0 + +#define MSEL_PP16_FAST_NOAES_NODC 0x0 +#define MSEL_PP16_FAST_AES_NODC 0x1 +#define MSEL_PP16_FAST_AESOPT_DC 0x2 +#define MSEL_PP16_SLOW_NOAES_NODC 0x4 +#define MSEL_PP16_SLOW_AES_NODC 0x5 +#define MSEL_PP16_SLOW_AESOPT_DC 0x6 +#define MSEL_PP32_FAST_NOAES_NODC 0x8 +#define MSEL_PP32_FAST_AES_NODC 0x9 +#define MSEL_PP32_FAST_AESOPT_DC 0xa +#define MSEL_PP32_SLOW_NOAES_NODC 0xc +#define MSEL_PP32_SLOW_AES_NODC 0xd +#define MSEL_PP32_SLOW_AESOPT_DC 0xe +#define SOCFPGA_FPGMGR_STAT_MSEL_MASK 0x000000f8 +#define SOCFPGA_FPGMGR_STAT_MSEL_SHIFT 3 + +/* SOCFPGA_FPGMGR_CTL register */ +#define SOCFPGA_FPGMGR_CTL_EN 0x00000001 +#define SOCFPGA_FPGMGR_CTL_NCE 0x00000002 +#define SOCFPGA_FPGMGR_CTL_NCFGPULL 0x00000004 + +#define CDRATIO_X1 0x00000000 +#define CDRATIO_X2 0x00000040 +#define CDRATIO_X4 0x00000080 +#define CDRATIO_X8 0x000000c0 +#define SOCFPGA_FPGMGR_CTL_CDRATIO_MASK 0x000000c0 + +#define SOCFPGA_FPGMGR_CTL_AXICFGEN 0x00000100 + +#define CFGWDTH_16 0x00000000 +#define CFGWDTH_32 0x00000200 +#define SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK 0x00000200 + +/* SOCFPGA_FPGMGR_DCLKSTAT register */ +#define SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE 0x1 + +/* SOCFPGA_FPGMGR_GPIO_* registers share the same bit positions */ +#define SOCFPGA_FPGMGR_MON_NSTATUS 0x0001 +#define SOCFPGA_FPGMGR_MON_CONF_DONE 0x0002 +#define SOCFPGA_FPGMGR_MON_INIT_DONE 0x0004 +#define SOCFPGA_FPGMGR_MON_CRC_ERROR 0x0008 +#define SOCFPGA_FPGMGR_MON_CVP_CONF_DONE 0x0010 +#define SOCFPGA_FPGMGR_MON_PR_READY 0x0020 +#define SOCFPGA_FPGMGR_MON_PR_ERROR 0x0040 +#define SOCFPGA_FPGMGR_MON_PR_DONE 0x0080 +#define SOCFPGA_FPGMGR_MON_NCONFIG_PIN 0x0100 +#define SOCFPGA_FPGMGR_MON_NSTATUS_PIN 0x0200 +#define SOCFPGA_FPGMGR_MON_CONF_DONE_PIN 0x0400 +#define SOCFPGA_FPGMGR_MON_FPGA_POWER_ON 0x0800 +#define SOCFPGA_FPGMGR_MON_STATUS_MASK 0x0fff + +#define SOCFPGA_FPGMGR_NUM_SUPPLIES 3 +#define SOCFPGA_RESUME_TIMEOUT 3 + +/* In power-up order. Reverse for power-down. */ +static const char *supply_names[SOCFPGA_FPGMGR_NUM_SUPPLIES] __maybe_unused = { + "FPGA-1.5V", + "FPGA-1.1V", + "FPGA-2.5V", +}; + +struct socfpga_fpga_priv { + void __iomem *fpga_base_addr; + void __iomem *fpga_data_addr; + struct completion status_complete; + int irq; +}; + +struct cfgmgr_mode { + /* Values to set in the CTRL register */ + u32 ctrl; + + /* flag that this table entry is a valid mode */ + bool valid; +}; + +/* For SOCFPGA_FPGMGR_STAT_MSEL field */ +static struct cfgmgr_mode cfgmgr_modes[] = { + [MSEL_PP16_FAST_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 }, + [MSEL_PP16_FAST_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 }, + [MSEL_PP16_FAST_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 }, + [MSEL_PP16_SLOW_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 }, + [MSEL_PP16_SLOW_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 }, + [MSEL_PP16_SLOW_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 }, + [MSEL_PP32_FAST_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 }, + [MSEL_PP32_FAST_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 }, + [MSEL_PP32_FAST_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 }, + [MSEL_PP32_SLOW_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 }, + [MSEL_PP32_SLOW_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 }, + [MSEL_PP32_SLOW_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 }, +}; + +static u32 socfpga_fpga_readl(struct socfpga_fpga_priv *priv, u32 reg_offset) +{ + return readl(priv->fpga_base_addr + reg_offset); +} + +static void socfpga_fpga_writel(struct socfpga_fpga_priv *priv, u32 reg_offset, + u32 value) +{ + writel(value, priv->fpga_base_addr + reg_offset); +} + +static u32 socfpga_fpga_raw_readl(struct socfpga_fpga_priv *priv, + u32 reg_offset) +{ + return __raw_readl(priv->fpga_base_addr + reg_offset); +} + +static void socfpga_fpga_raw_writel(struct socfpga_fpga_priv *priv, + u32 reg_offset, u32 value) +{ + __raw_writel(value, priv->fpga_base_addr + reg_offset); +} + +static void socfpga_fpga_data_writel(struct socfpga_fpga_priv *priv, u32 value) +{ + writel(value, priv->fpga_data_addr); +} + +static inline void socfpga_fpga_set_bitsl(struct socfpga_fpga_priv *priv, + u32 offset, u32 bits) +{ + u32 val; + + val = socfpga_fpga_readl(priv, offset); + val |= bits; + socfpga_fpga_writel(priv, offset, val); +} + +static inline void socfpga_fpga_clr_bitsl(struct socfpga_fpga_priv *priv, + u32 offset, u32 bits) +{ + u32 val; + + val = socfpga_fpga_readl(priv, offset); + val &= ~bits; + socfpga_fpga_writel(priv, offset, val); +} + +static u32 socfpga_fpga_mon_status_get(struct socfpga_fpga_priv *priv) +{ + return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST) & + SOCFPGA_FPGMGR_MON_STATUS_MASK; +} + +static u32 socfpga_fpga_state_get(struct socfpga_fpga_priv *priv) +{ + u32 status = socfpga_fpga_mon_status_get(priv); + + if ((status & SOCFPGA_FPGMGR_MON_FPGA_POWER_ON) == 0) + return SOCFPGA_FPGMGR_STAT_POWER_OFF; + + return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST) & + SOCFPGA_FPGMGR_STAT_STATE_MASK; +} + +static void socfpga_fpga_clear_done_status(struct socfpga_fpga_priv *priv) +{ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST, + SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE); +} + +/* + * Set the DCLKCNT, wait for DCLKSTAT to report the count completed, and clear + * the complete status. + */ +static int socfpga_fpga_dclk_set_and_wait_clear(struct socfpga_fpga_priv *priv, + u32 count) +{ + int timeout = 2; + u32 done; + + /* Clear any existing DONE status. */ + if (socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST)) + socfpga_fpga_clear_done_status(priv); + + /* Issue the DCLK count. */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKCNT_OFST, count); + + /* Poll DCLKSTAT to see if it completed in the timeout period. */ + do { + done = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST); + if (done == SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE) { + socfpga_fpga_clear_done_status(priv); + return 0; + } + udelay(1); + } while (timeout--); + + return -ETIMEDOUT; +} + +static int socfpga_fpga_wait_for_state(struct socfpga_fpga_priv *priv, + u32 state) +{ + int timeout = 2; + + /* + * HW doesn't support an interrupt for changes in state, so poll to see + * if it matches the requested state within the timeout period. + */ + do { + if ((socfpga_fpga_state_get(priv) & state) != 0) + return 0; + msleep(20); + } while (timeout--); + + return -ETIMEDOUT; +} + +static void socfpga_fpga_enable_irqs(struct socfpga_fpga_priv *priv, u32 irqs) +{ + /* set irqs to level sensitive */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST, 0); + + /* set interrupt polarity */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INT_POL_OFST, irqs); + + /* clear irqs */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs); + + /* unmask interrupts */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTMSK_OFST, 0); + + /* enable interrupts */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, irqs); +} + +static void socfpga_fpga_disable_irqs(struct socfpga_fpga_priv *priv) +{ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0); +} + +static irqreturn_t socfpga_fpga_isr(int irq, void *dev_id) +{ + struct socfpga_fpga_priv *priv = dev_id; + u32 irqs, st; + bool conf_done, nstatus; + + /* clear irqs */ + irqs = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST); + + socfpga_fpga_raw_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs); + + st = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST); + conf_done = (st & SOCFPGA_FPGMGR_MON_CONF_DONE) != 0; + nstatus = (st & SOCFPGA_FPGMGR_MON_NSTATUS) != 0; + + /* success */ + if (conf_done && nstatus) { + /* disable irqs */ + socfpga_fpga_raw_writel(priv, + SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0); + complete(&priv->status_complete); + } + + return IRQ_HANDLED; +} + +static int socfpga_fpga_wait_for_config_done(struct socfpga_fpga_priv *priv) +{ + int timeout, ret = 0; + + socfpga_fpga_disable_irqs(priv); + init_completion(&priv->status_complete); + socfpga_fpga_enable_irqs(priv, SOCFPGA_FPGMGR_MON_CONF_DONE); + + timeout = wait_for_completion_interruptible_timeout( + &priv->status_complete, + msecs_to_jiffies(10)); + if (timeout == 0) + ret = -ETIMEDOUT; + + socfpga_fpga_disable_irqs(priv); + return ret; +} + +static int socfpga_fpga_cfg_mode_get(struct socfpga_fpga_priv *priv) +{ + u32 msel; + + msel = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST); + msel &= SOCFPGA_FPGMGR_STAT_MSEL_MASK; + msel >>= SOCFPGA_FPGMGR_STAT_MSEL_SHIFT; + + /* Check that this MSEL setting is supported */ + if ((msel >= ARRAY_SIZE(cfgmgr_modes)) || !cfgmgr_modes[msel].valid) + return -EINVAL; + + return msel; +} + +static int socfpga_fpga_cfg_mode_set(struct socfpga_fpga_priv *priv) +{ + u32 ctrl_reg; + int mode; + + /* get value from MSEL pins */ + mode = socfpga_fpga_cfg_mode_get(priv); + if (mode < 0) + return mode; + + /* Adjust CTRL for the CDRATIO */ + ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST); + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CDRATIO_MASK; + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK; + ctrl_reg |= cfgmgr_modes[mode].ctrl; + + /* Set NCE to 0. */ + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCE; + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg); + + return 0; +} + +static int socfpga_fpga_reset(struct fpga_manager *mgr) +{ + struct socfpga_fpga_priv *priv = mgr->priv; + u32 ctrl_reg, status; + int ret; + + /* + * Step 1: + * - Set CTRL.CFGWDTH, CTRL.CDRATIO to match cfg mode + * - Set CTRL.NCE to 0 + */ + ret = socfpga_fpga_cfg_mode_set(priv); + if (ret) + return ret; + + /* Step 2: Set CTRL.EN to 1 */ + socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST, + SOCFPGA_FPGMGR_CTL_EN); + + /* Step 3: Set CTRL.NCONFIGPULL to 1 to put FPGA in reset */ + ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST); + ctrl_reg |= SOCFPGA_FPGMGR_CTL_NCFGPULL; + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg); + + /* Step 4: Wait for STATUS.MODE to report FPGA is in reset phase */ + status = socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_RESET); + + /* Step 5: Set CONTROL.NCONFIGPULL to 0 to release FPGA from reset */ + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCFGPULL; + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg); + + /* Timeout waiting for reset */ + if (status) + return -ETIMEDOUT; + + return 0; +} + +/* + * Prepare the FPGA to receive the configuration data. + */ +static int socfpga_fpga_ops_configure_init(struct fpga_manager *mgr, u32 flags, + const char *buf, size_t count) +{ + struct socfpga_fpga_priv *priv = mgr->priv; + int ret; + + if (flags & FPGA_MGR_PARTIAL_RECONFIG) { + dev_err(&mgr->dev, "Partial reconfiguration not supported.\n"); + return -EINVAL; + } + /* Steps 1 - 5: Reset the FPGA */ + ret = socfpga_fpga_reset(mgr); + if (ret) + return ret; + + /* Step 6: Wait for FPGA to enter configuration phase */ + if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_CFG)) + return -ETIMEDOUT; + + /* Step 7: Clear nSTATUS interrupt */ + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, + SOCFPGA_FPGMGR_MON_NSTATUS); + + /* Step 8: Set CTRL.AXICFGEN to 1 to enable transfer of config data */ + socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST, + SOCFPGA_FPGMGR_CTL_AXICFGEN); + + return 0; +} + +/* + * Step 9: write data to the FPGA data register + */ +static int socfpga_fpga_ops_configure_write(struct fpga_manager *mgr, + const char *buf, size_t count) +{ + struct socfpga_fpga_priv *priv = mgr->priv; + u32 *buffer_32 = (u32 *)buf; + size_t i = 0; + + if (count <= 0) + return -EINVAL; + + /* Write out the complete 32-bit chunks. */ + while (count >= sizeof(u32)) { + socfpga_fpga_data_writel(priv, buffer_32[i++]); + count -= sizeof(u32); + } + + /* Write out remaining non 32-bit chunks. */ + switch (count) { + case 3: + socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x00ffffff); + break; + case 2: + socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x0000ffff); + break; + case 1: + socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x000000ff); + break; + case 0: + break; + default: + /* This will never happen. */ + return -EFAULT; + } + + return 0; +} + +static int socfpga_fpga_ops_configure_complete(struct fpga_manager *mgr, + u32 flags) +{ + struct socfpga_fpga_priv *priv = mgr->priv; + u32 status; + + /* + * Step 10: + * - Observe CONF_DONE and nSTATUS (active low) + * - if CONF_DONE = 1 and nSTATUS = 1, configuration was successful + * - if CONF_DONE = 0 and nSTATUS = 0, configuration failed + */ + status = socfpga_fpga_wait_for_config_done(priv); + if (status) + return status; + + /* Step 11: Clear CTRL.AXICFGEN to disable transfer of config data */ + socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST, + SOCFPGA_FPGMGR_CTL_AXICFGEN); + + /* + * Step 12: + * - Write 4 to DCLKCNT + * - Wait for STATUS.DCNTDONE = 1 + * - Clear W1C bit in STATUS.DCNTDONE + */ + if (socfpga_fpga_dclk_set_and_wait_clear(priv, 4)) + return -ETIMEDOUT; + + /* Step 13: Wait for STATUS.MODE to report USER MODE */ + if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_USER_MODE)) + return -ETIMEDOUT; + + /* Step 14: Set CTRL.EN to 0 */ + socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST, + SOCFPGA_FPGMGR_CTL_EN); + + return 0; +} + +/* Translate state register values to FPGA framework state */ +static const enum fpga_mgr_states socfpga_state_to_framework_state[] = { + [SOCFPGA_FPGMGR_STAT_POWER_OFF] = FPGA_MGR_STATE_POWER_OFF, + [SOCFPGA_FPGMGR_STAT_RESET] = FPGA_MGR_STATE_RESET, + [SOCFPGA_FPGMGR_STAT_CFG] = FPGA_MGR_STATE_WRITE_INIT, + [SOCFPGA_FPGMGR_STAT_INIT] = FPGA_MGR_STATE_WRITE_INIT, + [SOCFPGA_FPGMGR_STAT_USER_MODE] = FPGA_MGR_STATE_OPERATING, + [SOCFPGA_FPGMGR_STAT_UNKNOWN] = FPGA_MGR_STATE_UNKNOWN, +}; + +static enum fpga_mgr_states socfpga_fpga_ops_state(struct fpga_manager *mgr) +{ + struct socfpga_fpga_priv *priv = mgr->priv; + enum fpga_mgr_states ret; + u32 state; + + state = socfpga_fpga_state_get(priv); + + if (state < ARRAY_SIZE(socfpga_state_to_framework_state)) + ret = socfpga_state_to_framework_state[state]; + else + ret = FPGA_MGR_STATE_UNKNOWN; + + return ret; +} + +static const struct fpga_manager_ops socfpga_fpga_ops = { + .state = socfpga_fpga_ops_state, + .write_init = socfpga_fpga_ops_configure_init, + .write = socfpga_fpga_ops_configure_write, + .write_complete = socfpga_fpga_ops_configure_complete, +}; + +static int socfpga_fpga_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct socfpga_fpga_priv *priv; + struct resource *res; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->fpga_base_addr = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->fpga_base_addr)) + return PTR_ERR(priv->fpga_base_addr); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + priv->fpga_data_addr = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->fpga_data_addr)) + return PTR_ERR(priv->fpga_data_addr); + + priv->irq = platform_get_irq(pdev, 0); + if (priv->irq < 0) + return priv->irq; + + ret = devm_request_irq(dev, priv->irq, socfpga_fpga_isr, 0, + dev_name(dev), priv); + if (ret) + return ret; + + return fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager", + &socfpga_fpga_ops, priv); +} + +static int socfpga_fpga_remove(struct platform_device *pdev) +{ + fpga_mgr_unregister(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id socfpga_fpga_of_match[] = { + { .compatible = "altr,socfpga-fpga-mgr", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, socfpga_fpga_of_match); +#endif + +static struct platform_driver socfpga_fpga_driver = { + .probe = socfpga_fpga_probe, + .remove = socfpga_fpga_remove, + .driver = { + .name = "socfpga_fpga_manager", + .of_match_table = of_match_ptr(socfpga_fpga_of_match), + }, +}; + +module_platform_driver(socfpga_fpga_driver); + +MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>"); +MODULE_DESCRIPTION("Altera SOCFPGA FPGA Manager"); +MODULE_LICENSE("GPL v2"); diff --git a/kernel/drivers/fpga/zynq-fpga.c b/kernel/drivers/fpga/zynq-fpga.c new file mode 100644 index 000000000..c2fb4120b --- /dev/null +++ b/kernel/drivers/fpga/zynq-fpga.c @@ -0,0 +1,514 @@ +/* + * Copyright (c) 2011-2015 Xilinx Inc. + * Copyright (c) 2015, National Instruments Corp. + * + * FPGA Manager Driver for Xilinx Zynq, heavily based on xdevcfg driver + * in their vendor tree. + * + * 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. + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/fpga/fpga-mgr.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/mfd/syscon.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/pm.h> +#include <linux/regmap.h> +#include <linux/string.h> + +/* Offsets into SLCR regmap */ + +/* FPGA Software Reset Control */ +#define SLCR_FPGA_RST_CTRL_OFFSET 0x240 +/* Level Shifters Enable */ +#define SLCR_LVL_SHFTR_EN_OFFSET 0x900 + +/* Constant Definitions */ + +/* Control Register */ +#define CTRL_OFFSET 0x00 +/* Lock Register */ +#define LOCK_OFFSET 0x04 +/* Interrupt Status Register */ +#define INT_STS_OFFSET 0x0c +/* Interrupt Mask Register */ +#define INT_MASK_OFFSET 0x10 +/* Status Register */ +#define STATUS_OFFSET 0x14 +/* DMA Source Address Register */ +#define DMA_SRC_ADDR_OFFSET 0x18 +/* DMA Destination Address Reg */ +#define DMA_DST_ADDR_OFFSET 0x1c +/* DMA Source Transfer Length */ +#define DMA_SRC_LEN_OFFSET 0x20 +/* DMA Destination Transfer */ +#define DMA_DEST_LEN_OFFSET 0x24 +/* Unlock Register */ +#define UNLOCK_OFFSET 0x34 +/* Misc. Control Register */ +#define MCTRL_OFFSET 0x80 + +/* Control Register Bit definitions */ + +/* Signal to reset FPGA */ +#define CTRL_PCFG_PROG_B_MASK BIT(30) +/* Enable PCAP for PR */ +#define CTRL_PCAP_PR_MASK BIT(27) +/* Enable PCAP */ +#define CTRL_PCAP_MODE_MASK BIT(26) + +/* Miscellaneous Control Register bit definitions */ +/* Internal PCAP loopback */ +#define MCTRL_PCAP_LPBK_MASK BIT(4) + +/* Status register bit definitions */ + +/* FPGA init status */ +#define STATUS_DMA_Q_F BIT(31) +#define STATUS_PCFG_INIT_MASK BIT(4) + +/* Interrupt Status/Mask Register Bit definitions */ +/* DMA command done */ +#define IXR_DMA_DONE_MASK BIT(13) +/* DMA and PCAP cmd done */ +#define IXR_D_P_DONE_MASK BIT(12) + /* FPGA programmed */ +#define IXR_PCFG_DONE_MASK BIT(2) +#define IXR_ERROR_FLAGS_MASK 0x00F0F860 +#define IXR_ALL_MASK 0xF8F7F87F + +/* Miscellaneous constant values */ + +/* Invalid DMA addr */ +#define DMA_INVALID_ADDRESS GENMASK(31, 0) +/* Used to unlock the dev */ +#define UNLOCK_MASK 0x757bdf0d +/* Timeout for DMA to complete */ +#define DMA_DONE_TIMEOUT msecs_to_jiffies(1000) +/* Timeout for polling reset bits */ +#define INIT_POLL_TIMEOUT 2500000 +/* Delay for polling reset bits */ +#define INIT_POLL_DELAY 20 + +/* Masks for controlling stuff in SLCR */ +/* Disable all Level shifters */ +#define LVL_SHFTR_DISABLE_ALL_MASK 0x0 +/* Enable Level shifters from PS to PL */ +#define LVL_SHFTR_ENABLE_PS_TO_PL 0xa +/* Enable Level shifters from PL to PS */ +#define LVL_SHFTR_ENABLE_PL_TO_PS 0xf +/* Enable global resets */ +#define FPGA_RST_ALL_MASK 0xf +/* Disable global resets */ +#define FPGA_RST_NONE_MASK 0x0 + +struct zynq_fpga_priv { + struct device *dev; + int irq; + struct clk *clk; + + void __iomem *io_base; + struct regmap *slcr; + + struct completion dma_done; +}; + +static inline void zynq_fpga_write(struct zynq_fpga_priv *priv, u32 offset, + u32 val) +{ + writel(val, priv->io_base + offset); +} + +static inline u32 zynq_fpga_read(const struct zynq_fpga_priv *priv, + u32 offset) +{ + return readl(priv->io_base + offset); +} + +#define zynq_fpga_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \ + readl_poll_timeout(priv->io_base + addr, val, cond, sleep_us, \ + timeout_us) + +static void zynq_fpga_mask_irqs(struct zynq_fpga_priv *priv) +{ + u32 intr_mask; + + intr_mask = zynq_fpga_read(priv, INT_MASK_OFFSET); + zynq_fpga_write(priv, INT_MASK_OFFSET, + intr_mask | IXR_DMA_DONE_MASK | IXR_ERROR_FLAGS_MASK); +} + +static void zynq_fpga_unmask_irqs(struct zynq_fpga_priv *priv) +{ + u32 intr_mask; + + intr_mask = zynq_fpga_read(priv, INT_MASK_OFFSET); + zynq_fpga_write(priv, INT_MASK_OFFSET, + intr_mask + & ~(IXR_D_P_DONE_MASK | IXR_ERROR_FLAGS_MASK)); +} + +static irqreturn_t zynq_fpga_isr(int irq, void *data) +{ + struct zynq_fpga_priv *priv = data; + + /* disable DMA and error IRQs */ + zynq_fpga_mask_irqs(priv); + + complete(&priv->dma_done); + + return IRQ_HANDLED; +} + +static int zynq_fpga_ops_write_init(struct fpga_manager *mgr, u32 flags, + const char *buf, size_t count) +{ + struct zynq_fpga_priv *priv; + u32 ctrl, status; + int err; + + priv = mgr->priv; + + err = clk_enable(priv->clk); + if (err) + return err; + + /* don't globally reset PL if we're doing partial reconfig */ + if (!(flags & FPGA_MGR_PARTIAL_RECONFIG)) { + /* assert AXI interface resets */ + regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET, + FPGA_RST_ALL_MASK); + + /* disable all level shifters */ + regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET, + LVL_SHFTR_DISABLE_ALL_MASK); + /* enable level shifters from PS to PL */ + regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET, + LVL_SHFTR_ENABLE_PS_TO_PL); + + /* create a rising edge on PCFG_INIT. PCFG_INIT follows + * PCFG_PROG_B, so we need to poll it after setting PCFG_PROG_B + * to make sure the rising edge actually happens. + * Note: PCFG_PROG_B is low active, sequence as described in + * UG585 v1.10 page 211 + */ + ctrl = zynq_fpga_read(priv, CTRL_OFFSET); + ctrl |= CTRL_PCFG_PROG_B_MASK; + + zynq_fpga_write(priv, CTRL_OFFSET, ctrl); + + err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status, + status & STATUS_PCFG_INIT_MASK, + INIT_POLL_DELAY, + INIT_POLL_TIMEOUT); + if (err) { + dev_err(priv->dev, "Timeout waiting for PCFG_INIT"); + goto out_err; + } + + ctrl = zynq_fpga_read(priv, CTRL_OFFSET); + ctrl &= ~CTRL_PCFG_PROG_B_MASK; + + zynq_fpga_write(priv, CTRL_OFFSET, ctrl); + + err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status, + !(status & STATUS_PCFG_INIT_MASK), + INIT_POLL_DELAY, + INIT_POLL_TIMEOUT); + if (err) { + dev_err(priv->dev, "Timeout waiting for !PCFG_INIT"); + goto out_err; + } + + ctrl = zynq_fpga_read(priv, CTRL_OFFSET); + ctrl |= CTRL_PCFG_PROG_B_MASK; + + zynq_fpga_write(priv, CTRL_OFFSET, ctrl); + + err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status, + status & STATUS_PCFG_INIT_MASK, + INIT_POLL_DELAY, + INIT_POLL_TIMEOUT); + if (err) { + dev_err(priv->dev, "Timeout waiting for PCFG_INIT"); + goto out_err; + } + } + + /* set configuration register with following options: + * - enable PCAP interface + * - set throughput for maximum speed + * - set CPU in user mode + */ + ctrl = zynq_fpga_read(priv, CTRL_OFFSET); + zynq_fpga_write(priv, CTRL_OFFSET, + (CTRL_PCAP_PR_MASK | CTRL_PCAP_MODE_MASK | ctrl)); + + /* check that we have room in the command queue */ + status = zynq_fpga_read(priv, STATUS_OFFSET); + if (status & STATUS_DMA_Q_F) { + dev_err(priv->dev, "DMA command queue full"); + err = -EBUSY; + goto out_err; + } + + /* ensure internal PCAP loopback is disabled */ + ctrl = zynq_fpga_read(priv, MCTRL_OFFSET); + zynq_fpga_write(priv, MCTRL_OFFSET, (~MCTRL_PCAP_LPBK_MASK & ctrl)); + + clk_disable(priv->clk); + + return 0; + +out_err: + clk_disable(priv->clk); + + return err; +} + +static int zynq_fpga_ops_write(struct fpga_manager *mgr, + const char *buf, size_t count) +{ + struct zynq_fpga_priv *priv; + int err; + char *kbuf; + size_t in_count; + dma_addr_t dma_addr; + u32 transfer_length; + u32 intr_status; + + in_count = count; + priv = mgr->priv; + + kbuf = dma_alloc_coherent(priv->dev, count, &dma_addr, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + memcpy(kbuf, buf, count); + + /* enable clock */ + err = clk_enable(priv->clk); + if (err) + goto out_free; + + zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK); + + reinit_completion(&priv->dma_done); + + /* enable DMA and error IRQs */ + zynq_fpga_unmask_irqs(priv); + + /* the +1 in the src addr is used to hold off on DMA_DONE IRQ + * until both AXI and PCAP are done ... + */ + zynq_fpga_write(priv, DMA_SRC_ADDR_OFFSET, (u32)(dma_addr) + 1); + zynq_fpga_write(priv, DMA_DST_ADDR_OFFSET, (u32)DMA_INVALID_ADDRESS); + + /* convert #bytes to #words */ + transfer_length = (count + 3) / 4; + + zynq_fpga_write(priv, DMA_SRC_LEN_OFFSET, transfer_length); + zynq_fpga_write(priv, DMA_DEST_LEN_OFFSET, 0); + + wait_for_completion(&priv->dma_done); + + intr_status = zynq_fpga_read(priv, INT_STS_OFFSET); + zynq_fpga_write(priv, INT_STS_OFFSET, intr_status); + + if (!((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) { + dev_err(priv->dev, "Error configuring FPGA"); + err = -EFAULT; + } + + clk_disable(priv->clk); + +out_free: + dma_free_coherent(priv->dev, in_count, kbuf, dma_addr); + + return err; +} + +static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr, u32 flags) +{ + struct zynq_fpga_priv *priv = mgr->priv; + int err; + u32 intr_status; + + err = clk_enable(priv->clk); + if (err) + return err; + + err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status, + intr_status & IXR_PCFG_DONE_MASK, + INIT_POLL_DELAY, + INIT_POLL_TIMEOUT); + + clk_disable(priv->clk); + + if (err) + return err; + + /* for the partial reconfig case we didn't touch the level shifters */ + if (!(flags & FPGA_MGR_PARTIAL_RECONFIG)) { + /* enable level shifters from PL to PS */ + regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET, + LVL_SHFTR_ENABLE_PL_TO_PS); + + /* deassert AXI interface resets */ + regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET, + FPGA_RST_NONE_MASK); + } + + return 0; +} + +static enum fpga_mgr_states zynq_fpga_ops_state(struct fpga_manager *mgr) +{ + int err; + u32 intr_status; + struct zynq_fpga_priv *priv; + + priv = mgr->priv; + + err = clk_enable(priv->clk); + if (err) + return FPGA_MGR_STATE_UNKNOWN; + + intr_status = zynq_fpga_read(priv, INT_STS_OFFSET); + clk_disable(priv->clk); + + if (intr_status & IXR_PCFG_DONE_MASK) + return FPGA_MGR_STATE_OPERATING; + + return FPGA_MGR_STATE_UNKNOWN; +} + +static const struct fpga_manager_ops zynq_fpga_ops = { + .state = zynq_fpga_ops_state, + .write_init = zynq_fpga_ops_write_init, + .write = zynq_fpga_ops_write, + .write_complete = zynq_fpga_ops_write_complete, +}; + +static int zynq_fpga_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct zynq_fpga_priv *priv; + struct resource *res; + int err; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->io_base = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->io_base)) + return PTR_ERR(priv->io_base); + + priv->slcr = syscon_regmap_lookup_by_phandle(dev->of_node, + "syscon"); + if (IS_ERR(priv->slcr)) { + dev_err(dev, "unable to get zynq-slcr regmap"); + return PTR_ERR(priv->slcr); + } + + init_completion(&priv->dma_done); + + priv->irq = platform_get_irq(pdev, 0); + if (priv->irq < 0) { + dev_err(dev, "No IRQ available"); + return priv->irq; + } + + err = devm_request_irq(dev, priv->irq, zynq_fpga_isr, 0, + dev_name(dev), priv); + if (err) { + dev_err(dev, "unable to request IRQ"); + return err; + } + + priv->clk = devm_clk_get(dev, "ref_clk"); + if (IS_ERR(priv->clk)) { + dev_err(dev, "input clock not found"); + return PTR_ERR(priv->clk); + } + + err = clk_prepare_enable(priv->clk); + if (err) { + dev_err(dev, "unable to enable clock"); + return err; + } + + /* unlock the device */ + zynq_fpga_write(priv, UNLOCK_OFFSET, UNLOCK_MASK); + + clk_disable(priv->clk); + + err = fpga_mgr_register(dev, "Xilinx Zynq FPGA Manager", + &zynq_fpga_ops, priv); + if (err) { + dev_err(dev, "unable to register FPGA manager"); + clk_unprepare(priv->clk); + return err; + } + + return 0; +} + +static int zynq_fpga_remove(struct platform_device *pdev) +{ + struct zynq_fpga_priv *priv; + struct fpga_manager *mgr; + + mgr = platform_get_drvdata(pdev); + priv = mgr->priv; + + fpga_mgr_unregister(&pdev->dev); + + clk_unprepare(priv->clk); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id zynq_fpga_of_match[] = { + { .compatible = "xlnx,zynq-devcfg-1.0", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, zynq_fpga_of_match); +#endif + +static struct platform_driver zynq_fpga_driver = { + .probe = zynq_fpga_probe, + .remove = zynq_fpga_remove, + .driver = { + .name = "zynq_fpga_manager", + .of_match_table = of_match_ptr(zynq_fpga_of_match), + }, +}; + +module_platform_driver(zynq_fpga_driver); + +MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>"); +MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>"); +MODULE_DESCRIPTION("Xilinx Zynq FPGA Manager"); +MODULE_LICENSE("GPL v2"); |