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Message-Id: <1499374158-12388-4-git-send-email-agust@denx.de>
Date: Thu, 6 Jul 2017 22:49:18 +0200
From: Anatolij Gustschin <agust@...x.de>
To: Lee Jones <lee.jones@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>,
Alan Tull <atull@...nel.org>
Cc: Moritz Fischer <moritz.fischer@...us.com>,
linux-gpio@...r.kernel.org, linux-fpga@...r.kernel.org,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] fpga manager: Add FT232H driver for Altera FPP
Add FPGA manager driver for loading Altera FPGAs via fast
passive parallel (FPP) interface using FTDI FT232H chip.
Signed-off-by: Anatolij Gustschin <agust@...x.de>
---
drivers/fpga/Kconfig | 7 +
drivers/fpga/Makefile | 1 +
drivers/fpga/ftdi-fifo-fpp.c | 569 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 577 insertions(+)
create mode 100644 drivers/fpga/ftdi-fifo-fpp.c
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index ad5448f..3ccc7a8 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -38,6 +38,13 @@ config FPGA_MGR_ALTERA_PS_SPI
FPGA manager driver support for Altera Arria/Cyclone/Stratix
using the passive serial interface over SPI.
+config FPGA_MGR_FTDI_FIFO_FPP
+ tristate "Altera FPP over FT232H FIFO"
+ depends on MFD_FTDI_FT232H
+ help
+ FPGA manager driver support for Altera fast passive parallel
+ interface (FPP) over FT232H FT245 FIFO.
+
config FPGA_MGR_SOCFPGA
tristate "Altera SOCFPGA FPGA Manager"
depends on ARCH_SOCFPGA || COMPILE_TEST
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index e09895f..66821c2 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_FPGA) += fpga-mgr.o
# FPGA Manager Drivers
obj-$(CONFIG_FPGA_MGR_ALTERA_CVP) += altera-cvp.o
obj-$(CONFIG_FPGA_MGR_ALTERA_PS_SPI) += altera-ps-spi.o
+obj-$(CONFIG_FPGA_MGR_FTDI_FIFO_FPP) += ftdi-fifo-fpp.o
obj-$(CONFIG_FPGA_MGR_ICE40_SPI) += ice40-spi.o
obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o
obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10) += socfpga-a10.o
diff --git a/drivers/fpga/ftdi-fifo-fpp.c b/drivers/fpga/ftdi-fifo-fpp.c
new file mode 100644
index 0000000..3981390
--- /dev/null
+++ b/drivers/fpga/ftdi-fifo-fpp.c
@@ -0,0 +1,569 @@
+/*
+ * Altera FPGA firmware upload via FPP using FT232H Bitbang/FT245-FIFO.
+ *
+ * Copyright (C) 2017 DENX Software Engineering
+ * Anatolij Gustschin <agust@...x.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/machine.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ftdi/ftdi.h>
+#include <linux/usb.h>
+
+#define BULK_OUT_BUF_SZ SZ_256K
+#define MAX_RETRIES 10
+
+/*
+ * With logic of CPLD we can write the state of nConfig pin and
+ * read back the state of some pins (conf_done, init_done, nStatus).
+ * Status header and bit assignment in data register on CPLD.
+ */
+#define INPUT_HEADER_0 0xA5
+#define INPUT_HEADER_1 0x5A
+#define IN_CONF_DONE BIT(0)
+#define IN_INIT_DONE BIT(1)
+#define OUT_NCONFIG BIT(0)
+#define OUT_RESET_N BIT(1)
+
+struct fpp_mgr_ops {
+ int (*write_init)(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *buf, size_t count);
+ int (*write)(struct fpga_manager *mgr, const char *buf, size_t count);
+ int (*write_complete)(struct fpga_manager *mgr,
+ struct fpga_image_info *info);
+};
+
+struct fpp_fpga_mgr_priv {
+ struct platform_device *pdev;
+ struct fpga_manager *mgr;
+ struct fpp_mgr_ops *ops;
+ struct gpio_chip *gpiochip;
+ struct gpiod_lookup_table *lookup;
+ struct gpio_desc *nconfig;
+ struct gpio_desc *conf_done;
+ char cfg_mode[8];
+ u8 out_data_port;
+ int index;
+ void *bulk_buf;
+ char usb_dev_id[32];
+ char fpga_mgr_name[64];
+};
+
+static int fpp_fpga_mgr_set_data_port(struct fpp_fpga_mgr_priv *priv,
+ u8 bitmask, u8 value)
+{
+ struct device *dev = &priv->pdev->dev;
+ struct bulk_desc desc;
+ u8 *data;
+ int ret;
+
+ /*
+ * With CPLD connected (in FT245 FIFO mode) we use ACBUS8&9
+ * pins to switch between data and command mode:
+ * ACBUS8&9 == 0, 0 --> normal mode (data communication)
+ * ACBUS8&9 == 1, 0 --> command mode
+ */
+ gpiod_set_raw_value_cansleep(priv->nconfig, 1);
+ gpiod_set_raw_value_cansleep(priv->conf_done, 0);
+ msleep(50);
+
+ /* Write commands to CPLD */
+ ret = ftdi_set_bitmode(priv->pdev, 0x00, BITMODE_SYNCFF);
+ if (ret)
+ return ret;
+
+ if (value)
+ priv->out_data_port |= bitmask;
+ else
+ priv->out_data_port &= ~bitmask;
+
+ data = priv->bulk_buf;
+ *data = priv->out_data_port;
+
+ desc.dir_out = true;
+ desc.act_len = 0;
+ desc.len = 1;
+ desc.data = data;
+ desc.timeout = FTDI_USB_WRITE_TIMEOUT;
+
+ ret = ftdi_bulk_xfer(priv->pdev, &desc);
+ if (ret) {
+ dev_err(dev, "Writing in SYNCFF mode failed: %d\n", ret);
+ return ret;
+ }
+
+ msleep(50);
+ /* Switch back to data mode with ACBUS8&9 back to low */
+ gpiod_set_raw_value_cansleep(priv->nconfig, 0);
+ gpiod_set_raw_value_cansleep(priv->conf_done, 0);
+ msleep(50);
+
+ return 0;
+}
+
+static int fpp_fpga_mgr_bitbang_write_init(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *buf, size_t count)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+ struct device *dev = &priv->pdev->dev;
+ int retries = MAX_RETRIES;
+ int ret;
+
+ gpiod_set_value_cansleep(priv->nconfig, 0);
+ msleep(50);
+ gpiod_set_value_cansleep(priv->nconfig, 1);
+ msleep(50);
+ gpiod_set_value_cansleep(priv->nconfig, 0);
+
+ /* Wait for CONF_DONE to get low */
+ do {
+ msleep(50);
+
+ ret = gpiod_get_value_cansleep(priv->conf_done);
+ if (ret < 0) {
+ dev_err(dev, "Failed to get CONF_DONE pin: %d\n", ret);
+ return ret;
+ }
+
+ if (!ret)
+ break;
+ } while (--retries > 0);
+
+ if (!retries) {
+ dev_warn(dev, "CONF_DONE low wait timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ ret = ftdi_set_bitmode(priv->pdev, 0xff, BITMODE_BITBANG);
+ if (ret < 0)
+ return ret;
+
+ /* Set max. working baud rate (for hardware without CPLD) */
+ return ftdi_set_baudrate(priv->pdev, 700000);
+}
+
+static int fpp_fpga_mgr_bitbang_write(struct fpga_manager *mgr,
+ const char *buf, size_t count)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+ struct bulk_desc desc;
+ size_t blk_sz;
+ int ret;
+
+ desc.data = priv->bulk_buf;
+ desc.dir_out = true;
+ desc.timeout = FTDI_USB_WRITE_TIMEOUT;
+
+ while (count) {
+ blk_sz = min_t(size_t, count, BULK_OUT_BUF_SZ);
+ memcpy(priv->bulk_buf, buf, blk_sz);
+ desc.act_len = 0;
+ desc.len = blk_sz;
+ ret = ftdi_bulk_xfer(priv->pdev, &desc);
+ if (ret < 0)
+ return ret;
+
+ buf += desc.act_len;
+ count -= desc.act_len;
+ }
+
+ return 0;
+}
+
+static int fpp_fpga_mgr_bitbang_write_complete(struct fpga_manager *mgr,
+ struct fpga_image_info *info)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+ struct device *dev = &priv->pdev->dev;
+ int retries = MAX_RETRIES;
+ int ret;
+
+ /* Wait for CONF_DONE to get high */
+ do {
+ msleep(50);
+
+ ret = gpiod_get_value_cansleep(priv->conf_done);
+ if (ret < 0)
+ return ret;
+
+ if (ret)
+ break;
+ } while (--retries > 0);
+
+ if (!retries) {
+ dev_warn(dev, "CONF_DONE wait timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ ftdi_disable_bitbang(priv->pdev);
+
+ return 0;
+}
+
+static inline bool status_hdr_is_valid(u8 *buf)
+{
+ return buf[0] == INPUT_HEADER_0 && buf[1] == INPUT_HEADER_1;
+}
+
+static int fpp_fpga_mgr_ft245_fifo_write_init(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *buf, size_t count)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+ struct device *dev = &priv->pdev->dev;
+ u8 *inbuf = priv->bulk_buf;
+ int retries = MAX_RETRIES;
+ int ret;
+
+ gpiod_direction_output_raw(priv->conf_done, 0);
+
+ /* Set/reset nConfig via commands to CPLD */
+ ret = fpp_fpga_mgr_set_data_port(priv, OUT_NCONFIG, 1);
+ if (ret)
+ return ret;
+ ret = fpp_fpga_mgr_set_data_port(priv, OUT_NCONFIG, 0);
+ if (ret)
+ return ret;
+ ret = fpp_fpga_mgr_set_data_port(priv, OUT_NCONFIG, 1);
+ if (ret)
+ return ret;
+
+ /* In FT245 FIFO mode we need sync FIFO mode to talk to FPGA */
+ ret = ftdi_set_bitmode(priv->pdev, 0xff, BITMODE_SYNCFF);
+ if (ret)
+ return ret;
+
+ /* Wait until FPGA is ready for loading (conf_done zero) or timeout */
+ do {
+ ret = ftdi_read_data(priv->pdev, inbuf, 64);
+ if (ret < 0) {
+ dev_err(dev, "Can't read status data: %d\n", ret);
+ return ret;
+ }
+
+ /* Check input buffer header and conf_done status */
+ if (status_hdr_is_valid(inbuf) &&
+ (inbuf[2] & IN_CONF_DONE) == 0)
+ break;
+
+ msleep(100); /* CPLD sends status every 100ms */
+ } while (--retries > 0);
+
+ if (!retries) {
+ dev_warn(dev, "CONF_DONE wait timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ /* Configure for max. baud rate (3MHz * 4 in bitbang mode) */
+ return ftdi_set_baudrate(priv->pdev, 3000000);
+}
+
+static int fpp_fpga_mgr_ft245_fifo_write(struct fpga_manager *mgr,
+ const char *buf, size_t count)
+{
+ return fpp_fpga_mgr_bitbang_write(mgr, buf, count);
+}
+
+static int fpp_fpga_mgr_ft245_fifo_write_complete(struct fpga_manager *mgr,
+ struct fpga_image_info *info)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+ struct device *dev = &priv->pdev->dev;
+ u8 *inbuf = priv->bulk_buf;
+ int retries = MAX_RETRIES;
+ int ret;
+ u8 mask;
+
+ mask = IN_CONF_DONE | IN_INIT_DONE;
+
+ do {
+ ret = ftdi_read_data(priv->pdev, inbuf, 64);
+ if (ret < 0) {
+ dev_err(dev, "Can't read status data: %d\n", ret);
+ return ret;
+ }
+
+ if (status_hdr_is_valid(inbuf) && (inbuf[2] & mask) == mask)
+ break;
+
+ msleep(100);
+ } while (--retries > 0);
+
+ if (!retries) {
+ dev_warn(dev, "INIT_DONE wait timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ /* Release Reset_n, keep nCONFIG high, too! */
+ return fpp_fpga_mgr_set_data_port(priv, OUT_NCONFIG | OUT_RESET_N, 1);
+}
+
+static enum fpga_mgr_states fpp_fpga_mgr_state(struct fpga_manager *mgr)
+{
+ return FPGA_MGR_STATE_UNKNOWN;
+}
+
+static int fpp_fpga_mgr_write_init(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *buf, size_t count)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+
+ if (info && info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
+ dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
+ return -EINVAL;
+ }
+
+ if (priv->ops->write_init)
+ return priv->ops->write_init(mgr, info, buf, count);
+
+ return -ENODEV;
+}
+
+static int fpp_fpga_mgr_write(struct fpga_manager *mgr, const char *buf,
+ size_t count)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+
+ if (priv->ops->write)
+ return priv->ops->write(mgr, buf, count);
+
+ return -ENODEV;
+}
+
+static int fpp_fpga_mgr_write_complete(struct fpga_manager *mgr,
+ struct fpga_image_info *info)
+{
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+
+ if (priv->ops->write_complete)
+ return priv->ops->write_complete(mgr, info);
+
+ return -ENODEV;
+}
+
+static struct fpp_mgr_ops fpp_mgr_bitbang_ops = {
+ .write_init = fpp_fpga_mgr_bitbang_write_init,
+ .write = fpp_fpga_mgr_bitbang_write,
+ .write_complete = fpp_fpga_mgr_bitbang_write_complete,
+};
+
+static struct fpp_mgr_ops fpp_mgr_ft245_fifo_ops = {
+ .write_init = fpp_fpga_mgr_ft245_fifo_write_init,
+ .write = fpp_fpga_mgr_ft245_fifo_write,
+ .write_complete = fpp_fpga_mgr_ft245_fifo_write_complete,
+};
+
+static const struct fpga_manager_ops fpp_fpga_mgr_ops = {
+ .state = fpp_fpga_mgr_state,
+ .write_init = fpp_fpga_mgr_write_init,
+ .write = fpp_fpga_mgr_write,
+ .write_complete = fpp_fpga_mgr_write_complete,
+};
+
+static ssize_t show_cfg_mode(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct fpga_manager *mgr = platform_get_drvdata(pdev);
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", priv->cfg_mode);
+}
+
+static ssize_t store_cfg_mode(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct fpga_manager *mgr = platform_get_drvdata(pdev);
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+
+ if (!count || count > sizeof(priv->cfg_mode))
+ return -EINVAL;
+
+ if (!strncmp(buf, "fifo", 4)) {
+ strncpy(priv->cfg_mode, buf, sizeof(priv->cfg_mode));
+ priv->cfg_mode[4] = 0;
+ priv->ops = &fpp_mgr_ft245_fifo_ops;
+ gpiod_direction_output_raw(priv->conf_done, 0);
+ } else if (!strncmp(buf, "bitbang", 7)) {
+ strncpy(priv->cfg_mode, buf, sizeof(priv->cfg_mode));
+ priv->cfg_mode[7] = 0;
+ priv->ops = &fpp_mgr_bitbang_ops;
+ gpiod_direction_input(priv->conf_done);
+ } else {
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static DEVICE_ATTR(cfg_mode, 0664, show_cfg_mode, store_cfg_mode);
+
+static int gpiochip_match_mfd_parent(struct gpio_chip *chip, void *data)
+{
+ struct device *gpiodev = chip->parent;
+ struct device *dev = data;
+
+ if (gpiodev->parent == dev)
+ return 1;
+ return 0;
+}
+
+static struct gpio_chip *find_gpiochip_by_parent(struct device *dev)
+{
+ return gpiochip_find((void *)dev, gpiochip_match_mfd_parent);
+}
+
+static int fpp_fpga_mgr_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct fpp_fpga_mgr_priv *priv;
+ struct gpiod_lookup_table *lookup;
+ int lookup_size, ret;
+ unsigned int i, gpios = 0;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ ret = sscanf(dev_name(dev->parent), "%s", priv->usb_dev_id);
+ if (ret != 1) {
+ dev_err(dev, "Can't get parent device name: %d\n", ret);
+ return -ENODEV;
+ }
+
+ /* Use unique USB bus/port in FPGA manager name */
+ snprintf(priv->fpga_mgr_name, sizeof(priv->fpga_mgr_name),
+ "ftdi-fpp-fpga-mgr %s", priv->usb_dev_id);
+
+ priv->gpiochip = find_gpiochip_by_parent(dev->parent);
+ if (!priv->gpiochip) {
+ dev_err(dev, "Defer probing FTDI CBUS gpiochip\n");
+ return -EPROBE_DEFER;
+ }
+
+ lookup_size = sizeof(*lookup) + 2 * sizeof(struct gpiod_lookup);
+ lookup = devm_kzalloc(dev, lookup_size, GFP_KERNEL);
+ if (!lookup)
+ return -ENOMEM;
+
+ lookup->dev_id = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+ if (!lookup->dev_id)
+ return -ENOMEM;
+
+ /* Does GPIO controller provide needed ACBUS8 and ACBUS9 pins? */
+ for (i = 0; i < priv->gpiochip->ngpio; i++) {
+ if (!priv->gpiochip->names[i])
+ continue;
+ if (!strncmp(priv->gpiochip->names[i], "ACBUS8", 6)) {
+ lookup->table[0].chip_hwnum = i;
+ gpios++;
+ }
+ if (!strncmp(priv->gpiochip->names[i], "ACBUS9", 6)) {
+ lookup->table[1].chip_hwnum = i;
+ gpios++;
+ }
+ }
+
+ if (gpios < 2) {
+ dev_err(dev, "Missing control GPIOs\n");
+ return -ENODEV;
+ }
+
+ lookup->table[0].chip_label = priv->gpiochip->label;
+ lookup->table[0].con_id = "nconfig";
+ lookup->table[0].flags = GPIO_ACTIVE_LOW;
+ lookup->table[1].chip_label = priv->gpiochip->label;
+ lookup->table[1].con_id = "conf_done";
+ lookup->table[1].flags = GPIO_ACTIVE_HIGH;
+
+ priv->lookup = lookup;
+ gpiod_add_lookup_table(priv->lookup);
+
+ priv->pdev = pdev;
+ priv->ops = &fpp_mgr_ft245_fifo_ops;
+ strncpy(priv->cfg_mode, "fifo", sizeof(priv->cfg_mode));
+
+ priv->nconfig = gpiod_get(dev, "nconfig", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->nconfig)) {
+ ret = PTR_ERR(priv->nconfig);
+ dev_err(dev, "Failed to get nconfig gpio: %d\n", ret);
+ goto err_cfg0;
+ }
+
+ priv->conf_done = gpiod_get(dev, "conf_done", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->conf_done)) {
+ ret = PTR_ERR(priv->conf_done);
+ dev_err(dev, "Failed to get conf_done gpio: %d\n", ret);
+ goto err_cfg1;
+ }
+
+ priv->bulk_buf = devm_kmalloc(dev, BULK_OUT_BUF_SZ,
+ GFP_KERNEL | GFP_DMA32);
+ if (!priv->bulk_buf) {
+ ret = -ENOMEM;
+ goto err_cfg2;
+ }
+
+ ret = fpga_mgr_register(dev, priv->fpga_mgr_name,
+ &fpp_fpga_mgr_ops, priv);
+ if (ret)
+ goto err_cfg2;
+
+ ret = device_create_file(dev, &dev_attr_cfg_mode);
+ if (ret)
+ dev_warn(dev, "Can't create cfg_mode interface %d\n", ret);
+
+ return 0;
+
+err_cfg2:
+ gpiod_put(priv->conf_done);
+err_cfg1:
+ gpiod_put(priv->nconfig);
+err_cfg0:
+ gpiod_remove_lookup_table(priv->lookup);
+ return ret;
+}
+
+static int fpp_fpga_mgr_remove(struct platform_device *pdev)
+{
+ struct fpga_manager *mgr = platform_get_drvdata(pdev);
+ struct fpp_fpga_mgr_priv *priv = mgr->priv;
+
+ device_remove_file(&pdev->dev, &dev_attr_cfg_mode);
+ fpga_mgr_unregister(&pdev->dev);
+ gpiod_put(priv->conf_done);
+ gpiod_put(priv->nconfig);
+ gpiod_remove_lookup_table(priv->lookup);
+ return 0;
+}
+
+static struct platform_driver fpp_fpga_mgr_driver = {
+ .driver.name = "ftdi-fifo-fpp-mgr",
+ .probe = fpp_fpga_mgr_probe,
+ .remove = fpp_fpga_mgr_remove,
+};
+
+module_platform_driver(fpp_fpga_mgr_driver);
+
+MODULE_ALIAS("platform:ftdi-fifo-fpp-mgr");
+MODULE_AUTHOR("Anatolij Gustschin <agust@...x.de>");
+MODULE_DESCRIPTION("FT232H Bitbang/FT245-FIFO FPP FPGA Manager Driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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