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![Ivan Bornyakov](/assets/img/avatar_default.png)
Add support to the FPGA manager for programming Lattice ECP5 FPGA over slave SPI sysCONFIG interface. sysCONFIG interface core functionality is separate from both ECP5 and SPI specifics, so support for other FPGAs with different port types can be added in the future. Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru> Acked-by: Xu Yilun <yilun.xu@intel.com> Link: https://lore.kernel.org/r/20221025053947.2737-2-i.bornyakov@metrotek.ru [yilun.xu@intel.com: remove redundant blank line after kmemdup] Signed-off-by: Xu Yilun <yilun.xu@intel.com>
397 lines
8.7 KiB
C
397 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Lattice FPGA sysCONFIG interface functions independent of port type.
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*/
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#include <linux/delay.h>
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#include <linux/fpga/fpga-mgr.h>
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#include <linux/gpio/consumer.h>
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#include <linux/iopoll.h>
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#include "lattice-sysconfig.h"
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static int sysconfig_cmd_write(struct sysconfig_priv *priv, const void *buf,
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size_t buf_len)
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{
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return priv->command_transfer(priv, buf, buf_len, NULL, 0);
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}
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static int sysconfig_cmd_read(struct sysconfig_priv *priv, const void *tx_buf,
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size_t tx_len, void *rx_buf, size_t rx_len)
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{
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return priv->command_transfer(priv, tx_buf, tx_len, rx_buf, rx_len);
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}
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static int sysconfig_read_busy(struct sysconfig_priv *priv)
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{
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const u8 lsc_check_busy[] = SYSCONFIG_LSC_CHECK_BUSY;
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u8 busy;
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int ret;
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ret = sysconfig_cmd_read(priv, lsc_check_busy, sizeof(lsc_check_busy),
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&busy, sizeof(busy));
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return ret ? : busy;
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}
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static int sysconfig_poll_busy(struct sysconfig_priv *priv)
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{
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int ret, busy;
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ret = read_poll_timeout(sysconfig_read_busy, busy, busy <= 0,
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SYSCONFIG_POLL_INTERVAL_US,
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SYSCONFIG_POLL_BUSY_TIMEOUT_US, false, priv);
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return ret ? : busy;
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}
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static int sysconfig_read_status(struct sysconfig_priv *priv, u32 *status)
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{
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const u8 lsc_read_status[] = SYSCONFIG_LSC_READ_STATUS;
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__be32 device_status;
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int ret;
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ret = sysconfig_cmd_read(priv, lsc_read_status, sizeof(lsc_read_status),
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&device_status, sizeof(device_status));
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if (ret)
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return ret;
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*status = be32_to_cpu(device_status);
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return 0;
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}
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static int sysconfig_poll_status(struct sysconfig_priv *priv, u32 *status)
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{
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int ret = sysconfig_poll_busy(priv);
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if (ret)
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return ret;
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return sysconfig_read_status(priv, status);
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}
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static int sysconfig_poll_gpio(struct gpio_desc *gpio, bool is_active)
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{
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int ret, val;
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ret = read_poll_timeout(gpiod_get_value, val,
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val < 0 || !!val == is_active,
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SYSCONFIG_POLL_INTERVAL_US,
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SYSCONFIG_POLL_GPIO_TIMEOUT_US, false, gpio);
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if (val < 0)
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return val;
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return ret;
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}
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static int sysconfig_gpio_refresh(struct sysconfig_priv *priv)
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{
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struct gpio_desc *program = priv->program;
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struct gpio_desc *init = priv->init;
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struct gpio_desc *done = priv->done;
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int ret;
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/* Enter init mode */
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gpiod_set_value(program, 1);
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ret = sysconfig_poll_gpio(init, true);
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if (!ret)
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ret = sysconfig_poll_gpio(done, false);
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if (ret)
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return ret;
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/* Enter program mode */
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gpiod_set_value(program, 0);
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return sysconfig_poll_gpio(init, false);
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}
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static int sysconfig_lsc_refresh(struct sysconfig_priv *priv)
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{
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static const u8 lsc_refresh[] = SYSCONFIG_LSC_REFRESH;
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int ret;
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ret = sysconfig_cmd_write(priv, lsc_refresh, sizeof(lsc_refresh));
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if (ret)
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return ret;
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usleep_range(4000, 8000);
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return 0;
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}
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static int sysconfig_refresh(struct sysconfig_priv *priv)
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{
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struct gpio_desc *program = priv->program;
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struct gpio_desc *init = priv->init;
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struct gpio_desc *done = priv->done;
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if (program && init && done)
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return sysconfig_gpio_refresh(priv);
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return sysconfig_lsc_refresh(priv);
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}
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static int sysconfig_isc_enable(struct sysconfig_priv *priv)
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{
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u8 isc_enable[] = SYSCONFIG_ISC_ENABLE;
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u32 status;
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int ret;
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ret = sysconfig_cmd_write(priv, isc_enable, sizeof(isc_enable));
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if (ret)
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return ret;
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ret = sysconfig_poll_status(priv, &status);
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if (ret)
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return ret;
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if (status & SYSCONFIG_STATUS_FAIL)
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return -EFAULT;
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return 0;
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}
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static int sysconfig_isc_erase(struct sysconfig_priv *priv)
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{
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u8 isc_erase[] = SYSCONFIG_ISC_ERASE;
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u32 status;
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int ret;
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ret = sysconfig_cmd_write(priv, isc_erase, sizeof(isc_erase));
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if (ret)
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return ret;
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ret = sysconfig_poll_status(priv, &status);
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if (ret)
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return ret;
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if (status & SYSCONFIG_STATUS_FAIL)
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return -EFAULT;
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return 0;
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}
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static int sysconfig_isc_init(struct sysconfig_priv *priv)
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{
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int ret = sysconfig_isc_enable(priv);
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if (ret)
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return ret;
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return sysconfig_isc_erase(priv);
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}
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static int sysconfig_lsc_init_addr(struct sysconfig_priv *priv)
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{
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const u8 lsc_init_addr[] = SYSCONFIG_LSC_INIT_ADDR;
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return sysconfig_cmd_write(priv, lsc_init_addr, sizeof(lsc_init_addr));
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}
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static int sysconfig_burst_write_init(struct sysconfig_priv *priv)
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{
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return priv->bitstream_burst_write_init(priv);
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}
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static int sysconfig_burst_write_complete(struct sysconfig_priv *priv)
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{
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return priv->bitstream_burst_write_complete(priv);
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}
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static int sysconfig_bitstream_burst_write(struct sysconfig_priv *priv,
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const char *buf, size_t count)
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{
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int ret = priv->bitstream_burst_write(priv, buf, count);
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if (ret)
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sysconfig_burst_write_complete(priv);
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return ret;
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}
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static int sysconfig_isc_disable(struct sysconfig_priv *priv)
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{
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const u8 isc_disable[] = SYSCONFIG_ISC_DISABLE;
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return sysconfig_cmd_write(priv, isc_disable, sizeof(isc_disable));
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}
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static void sysconfig_cleanup(struct sysconfig_priv *priv)
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{
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sysconfig_isc_erase(priv);
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sysconfig_refresh(priv);
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}
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static int sysconfig_isc_finish(struct sysconfig_priv *priv)
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{
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struct gpio_desc *done_gpio = priv->done;
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u32 status;
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int ret;
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if (done_gpio) {
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ret = sysconfig_isc_disable(priv);
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if (ret)
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return ret;
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return sysconfig_poll_gpio(done_gpio, true);
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}
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ret = sysconfig_poll_status(priv, &status);
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if (ret)
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return ret;
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if ((status & SYSCONFIG_STATUS_DONE) &&
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!(status & SYSCONFIG_STATUS_BUSY) &&
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!(status & SYSCONFIG_STATUS_ERR))
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return sysconfig_isc_disable(priv);
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return -EFAULT;
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}
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static enum fpga_mgr_states sysconfig_ops_state(struct fpga_manager *mgr)
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{
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struct sysconfig_priv *priv = mgr->priv;
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struct gpio_desc *done = priv->done;
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u32 status;
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int ret;
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if (done && (gpiod_get_value(done) > 0))
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return FPGA_MGR_STATE_OPERATING;
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ret = sysconfig_read_status(priv, &status);
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if (!ret && (status & SYSCONFIG_STATUS_DONE))
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return FPGA_MGR_STATE_OPERATING;
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return FPGA_MGR_STATE_UNKNOWN;
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}
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static int sysconfig_ops_write_init(struct fpga_manager *mgr,
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struct fpga_image_info *info,
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const char *buf, size_t count)
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{
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struct sysconfig_priv *priv = mgr->priv;
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struct device *dev = &mgr->dev;
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int ret;
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if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
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dev_err(dev, "Partial reconfiguration is not supported\n");
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return -EOPNOTSUPP;
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}
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/* Enter program mode */
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ret = sysconfig_refresh(priv);
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if (ret) {
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dev_err(dev, "Failed to go to program mode\n");
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return ret;
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}
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/* Enter ISC mode */
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ret = sysconfig_isc_init(priv);
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if (ret) {
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dev_err(dev, "Failed to go to ISC mode\n");
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return ret;
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}
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/* Initialize the Address Shift Register */
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ret = sysconfig_lsc_init_addr(priv);
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if (ret) {
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dev_err(dev,
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"Failed to initialize the Address Shift Register\n");
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return ret;
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}
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/* Prepare for bitstream burst write */
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ret = sysconfig_burst_write_init(priv);
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if (ret)
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dev_err(dev, "Failed to prepare for bitstream burst write\n");
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return ret;
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}
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static int sysconfig_ops_write(struct fpga_manager *mgr, const char *buf,
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size_t count)
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{
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return sysconfig_bitstream_burst_write(mgr->priv, buf, count);
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}
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static int sysconfig_ops_write_complete(struct fpga_manager *mgr,
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struct fpga_image_info *info)
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{
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struct sysconfig_priv *priv = mgr->priv;
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struct device *dev = &mgr->dev;
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int ret;
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ret = sysconfig_burst_write_complete(priv);
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if (!ret)
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ret = sysconfig_poll_busy(priv);
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if (ret) {
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dev_err(dev, "Error while waiting bitstream write to finish\n");
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goto fail;
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}
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ret = sysconfig_isc_finish(priv);
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fail:
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if (ret)
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sysconfig_cleanup(priv);
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return ret;
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}
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static const struct fpga_manager_ops sysconfig_fpga_mgr_ops = {
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.state = sysconfig_ops_state,
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.write_init = sysconfig_ops_write_init,
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.write = sysconfig_ops_write,
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.write_complete = sysconfig_ops_write_complete,
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};
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int sysconfig_probe(struct sysconfig_priv *priv)
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{
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struct gpio_desc *program, *init, *done;
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struct device *dev = priv->dev;
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struct fpga_manager *mgr;
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if (!dev)
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return -ENODEV;
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if (!priv->command_transfer ||
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!priv->bitstream_burst_write_init ||
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!priv->bitstream_burst_write ||
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!priv->bitstream_burst_write_complete) {
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dev_err(dev, "Essential callback is missing\n");
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return -EINVAL;
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}
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program = devm_gpiod_get_optional(dev, "program", GPIOD_OUT_LOW);
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if (IS_ERR(program))
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return dev_err_probe(dev, PTR_ERR(program),
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"Failed to get PROGRAM GPIO\n");
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init = devm_gpiod_get_optional(dev, "init", GPIOD_IN);
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if (IS_ERR(init))
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return dev_err_probe(dev, PTR_ERR(init),
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"Failed to get INIT GPIO\n");
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done = devm_gpiod_get_optional(dev, "done", GPIOD_IN);
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if (IS_ERR(done))
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return dev_err_probe(dev, PTR_ERR(done),
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"Failed to get DONE GPIO\n");
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priv->program = program;
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priv->init = init;
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priv->done = done;
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mgr = devm_fpga_mgr_register(dev, "Lattice sysCONFIG FPGA Manager",
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&sysconfig_fpga_mgr_ops, priv);
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return PTR_ERR_OR_ZERO(mgr);
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}
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EXPORT_SYMBOL(sysconfig_probe);
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MODULE_DESCRIPTION("Lattice sysCONFIG FPGA Manager Core");
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MODULE_LICENSE("GPL");
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