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Date: Fri, 16 Sep 2022 21:27:45 +0300
From: Ivan Bornyakov <i.bornyakov@...rotek.ru>
To: Xu Yilun <yilun.xu@...el.com>
Cc: mdf@...nel.org, hao.wu@...el.com, trix@...hat.com, dg@...ix.com,
j.zink@...gutronix.de, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, linux-fpga@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel@...gutronix.de, system@...rotek.ru
Subject: Re: [PATCH v11 1/2] fpga: lattice-sysconfig-spi: add Lattice
sysCONFIG FPGA manager
On Sat, Sep 17, 2022 at 01:10:28AM +0800, Xu Yilun wrote:
> On 2022-09-13 at 16:07:13 +0300, Ivan Bornyakov wrote:
> > Add support to the FPGA manager for programming Lattice ECP5 and MachXO2
> > FPGAs over slave SPI sysCONFIG interface.
> >
> > Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
> > ---
> > drivers/fpga/Kconfig | 7 +
> > drivers/fpga/Makefile | 3 +
> > drivers/fpga/sysconfig-spi.c | 210 ++++++++++++++
> > drivers/fpga/sysconfig.c | 528 +++++++++++++++++++++++++++++++++++
> > drivers/fpga/sysconfig.h | 62 ++++
> > 5 files changed, 810 insertions(+)
> > create mode 100644 drivers/fpga/sysconfig-spi.c
> > create mode 100644 drivers/fpga/sysconfig.c
> > create mode 100644 drivers/fpga/sysconfig.h
> >
> > diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> > index 6c416955da53..991d9d976dca 100644
> > --- a/drivers/fpga/Kconfig
> > +++ b/drivers/fpga/Kconfig
> > @@ -263,4 +263,11 @@ config FPGA_MGR_MICROCHIP_SPI
> > programming over slave SPI interface with .dat formatted
> > bitstream image.
> >
> > +config FPGA_MGR_LATTICE_SPI
> > + tristate "Lattice sysCONFIG SPI FPGA manager"
> > + depends on SPI
> > + help
> > + FPGA manager driver support for Lattice FPGAs programming over slave
> > + SPI sysCONFIG interface.
> > +
> > endif # FPGA
> > diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> > index 42ae8b58abce..70e5f58d0c10 100644
> > --- a/drivers/fpga/Makefile
> > +++ b/drivers/fpga/Makefile
> > @@ -20,9 +20,12 @@ obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o
> > obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA) += zynqmp-fpga.o
> > obj-$(CONFIG_FPGA_MGR_VERSAL_FPGA) += versal-fpga.o
> > obj-$(CONFIG_FPGA_MGR_MICROCHIP_SPI) += microchip-spi.o
> > +obj-$(CONFIG_FPGA_MGR_LATTICE_SPI) += lattice-sysconfig-spi.o
> > obj-$(CONFIG_ALTERA_PR_IP_CORE) += altera-pr-ip-core.o
> > obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT) += altera-pr-ip-core-plat.o
> >
> > +lattice-sysconfig-spi-objs := sysconfig-spi.o sysconfig.o
>
> What's your plan if sysconfig-i2c is to be added?
>
> There are many examples in kernel actually, is it better like the
> following:
>
> obj-$(CONFIG_FPGA_MGR_LATTICE_SYSCONFIG) += lattice-sysconfig.o
> obj-$(CONFIG_LATTICE_SYSCONFIG_SPI) += lattice-sysconfig-spi.o
>
I was thinking of:
obj-$(CONFIG_FPGA_MGR_LATTICE_I2C) += lattice-sysconfig-i2c.o
lattice-sysconfig-i2c-objs := sysconfig-i2c.o sysconfig.o
> > +
> > # FPGA Secure Update Drivers
> > obj-$(CONFIG_FPGA_M10_BMC_SEC_UPDATE) += intel-m10-bmc-sec-update.o
> >
> > diff --git a/drivers/fpga/sysconfig-spi.c b/drivers/fpga/sysconfig-spi.c
> > new file mode 100644
> > index 000000000000..e2c71bc3b674
> > --- /dev/null
> > +++ b/drivers/fpga/sysconfig-spi.c
> > @@ -0,0 +1,210 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Lattice FPGA programming over slave SPI sysCONFIG interface.
> > + */
> > +
> > +#include <linux/of_device.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#include "sysconfig.h"
> > +
> > +struct sysconfig_spi_fpga_priv {
> > + const struct sysconfig_fpga_priv *fpga_priv;
> > + u32 max_speed_hz;
> > +};
> > +
> > +static const struct sysconfig_spi_fpga_priv ecp5_spi_data = {
> > + .fpga_priv = &ecp5_data,
> > + .max_speed_hz = 60000000,
> > +};
> > +
> > +static const struct sysconfig_spi_fpga_priv machxo2_spi_data = {
> > + .fpga_priv = &machxo2_data,
> > + .max_speed_hz = 66000000,
> > +};
> > +
> > +static int sysconfig_spi_cmd_write(struct sysconfig_priv *priv,
> > + const void *tx_buf, size_t tx_len)
> > +{
> > + struct spi_device *spi = to_spi_device(priv->dev);
> > +
> > + if (!spi)
> > + return -ENODEV;
>
> Any reason to check it everytime? The driver should make sure it is
> properly initialized on probe, is it?
>
Actually, no.
> > +
> > + return spi_write(spi, tx_buf, tx_len);
> > +}
> > +
> > +static int sysconfig_spi_cmd_write_with_data(struct sysconfig_priv *priv,
> > + const void *cmd, size_t cmd_len,
> > + const void *data, size_t data_len)
>
> I think the 2 write callbacks could be combined and named
> sysconfig_spi_cmd_write()
>
sysconfig_spi_cmd_write_with_data() is only needed for paged bitstream
write. The reason to have a separate write_with_data() was to simplify
calling of write() of every other commands.
> > +{
> > + struct spi_device *spi = to_spi_device(priv->dev);
> > + struct spi_transfer xfers[2] = {
> > + {
> > + .tx_buf = cmd,
> > + .len = cmd_len,
> > + }, {
> > + .tx_buf = data,
> > + .len = data_len,
> > + },
> > + };
> > +
> > + if (!spi)
> > + return -ENODEV;
> > +
> > + return spi_sync_transfer(spi, xfers, 2);
> > +}
> > +
> > +static int sysconfig_spi_cmd_write_then_read(struct sysconfig_priv *priv,
> > + const void *tx_buf, size_t tx_len,
> > + void *rx_buf, size_t rx_len)
>
> Maybe just sysconfig_spi_cmd_read(), No matter write or read data, command word
> should always be TXed first, so no need to say write here.
>
As you wish. I have no strong feelings for namings. cmd_write() and
cmd_write_then_read() was named so to mimic spi_write() and
spi_write_then_read() namings.
> > +{
> > + struct spi_device *spi = to_spi_device(priv->dev);
> > +
> > + if (!spi)
> > + return -ENODEV;
> > +
> > + return spi_write_then_read(spi, tx_buf, tx_len, rx_buf, rx_len);
> > +}
> > +
> > +static int sysconfig_spi_lsc_burst_init(struct sysconfig_priv *priv)
>
> Is it better sysconfig_spi_bitstream_burst_init?
Sure, why not
>
> By the way, what is LSC & ISC?
>
I don't know. Commands naming is from datasheet FPGA-TN-02039-2.0, but,
sadly, datasheet don't provide definitions for these acronyms.
> > +{
> > + const u8 lsc_bitstream_burst[] = SYSCONFIG_LSC_BITSTREAM_BURST;
> > + struct spi_device *spi = to_spi_device(priv->dev);
> > + struct spi_transfer xfer = {
> > + .tx_buf = lsc_bitstream_burst,
> > + .len = sizeof(lsc_bitstream_burst),
> > + .cs_change = 1,
>
> I'm not sure what's the effect to have cs_change on last transfer, is it to
> last cs active to the next message?
>
Yes, you are correct.
> > + };
> > + struct spi_message msg;
> > + int ret;
> > +
> > + if (!spi)
> > + return -ENODEV;
> > +
> > + spi_message_init_with_transfers(&msg, &xfer, 1);
> > +
> > + /*
> > + * Lock SPI bus for exclusive usage until FPGA programming is done.
> > + * SPI bus will be released in sysconfig_spi_lsc_burst_complete().
> > + */
> > + spi_bus_lock(spi->controller);
> > +
> > + ret = spi_sync_locked(spi, &msg);
> > + if (ret)
> > + spi_bus_unlock(spi->controller);
> > +
> > + return ret;
> > +}
> > +
> > +static int sysconfig_spi_bitstream_burst_write(struct sysconfig_priv *priv,
> > + const char *buf, size_t count)
>
> Why 'count', is 'len' better, to aligned with previous callbacks.
>
OK
> > +{
> > + struct spi_device *spi = to_spi_device(priv->dev);
> > + struct spi_transfer xfer = {
> > + .tx_buf = buf,
> > + .len = count,
> > + .cs_change = 1,
> > + };
> > + struct spi_message msg;
> > +
> > + if (!spi)
> > + return -ENODEV;
> > +
> > + spi_message_init_with_transfers(&msg, &xfer, 1);
> > +
> > + return spi_sync_locked(spi, &msg);
> > +}
> > +
> > +static int sysconfig_spi_lsc_burst_complete(struct sysconfig_priv *priv)
>
> sysconfig_spi_bitstream_burst_complete?
>
OK
> > +{
> > + struct spi_device *spi = to_spi_device(priv->dev);
> > +
> > + if (!spi)
> > + return -ENODEV;
> > +
> > + /* Bitstream burst write is done, release SPI bus */
> > + spi_bus_unlock(spi->controller);
> > +
> > + /* Toggle CS to finish bitstream write */
> > + return spi_write(spi, NULL, 0);
> > +}
> > +
> > +static int sysconfig_spi_probe(struct spi_device *spi)
> > +{
> > + const struct sysconfig_spi_fpga_priv *spi_fpga_priv;
> > + const struct spi_device_id *dev_id;
> > + struct device *dev = &spi->dev;
> > + struct sysconfig_priv *priv;
> > +
> > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + spi_fpga_priv = of_device_get_match_data(dev);
> > + if (!spi_fpga_priv) {
> > + dev_id = spi_get_device_id(spi);
> > + if (!dev_id)
> > + return -ENODEV;
> > +
> > + spi_fpga_priv = (const struct sysconfig_spi_fpga_priv *)dev_id->driver_data;
> > + }
> > +
> > + if (!spi_fpga_priv)
> > + return -EINVAL;
> > +
> > + if (spi->max_speed_hz > spi_fpga_priv->max_speed_hz) {
> > + dev_err(dev, "SPI speed %u is too high, maximum speed is %u\n",
> > + spi->max_speed_hz, spi_fpga_priv->max_speed_hz);
> > + return -EINVAL;
> > + }
> > +
> > + priv->dev = dev;
> > + priv->fpga_priv = spi_fpga_priv->fpga_priv;
> > + priv->command_write = sysconfig_spi_cmd_write;
> > + priv->command_write_with_data = sysconfig_spi_cmd_write_with_data;
> > + priv->command_write_then_read = sysconfig_spi_cmd_write_then_read;
> > + priv->bitstream_burst_write_init = sysconfig_spi_lsc_burst_init;
> > + priv->bitstream_burst_write = sysconfig_spi_bitstream_burst_write;
> > + priv->bitstream_burst_write_complete = sysconfig_spi_lsc_burst_complete;
> > +
> > + return sysconfig_probe(priv);
> > +}
> > +
> > +static const struct spi_device_id sysconfig_spi_ids[] = {
> > + {
> > + .name = "sysconfig-ecp5",
> > + .driver_data = (kernel_ulong_t)&ecp5_spi_data,
> > + }, {
> > + .name = "sysconfig-machxo2",
> > + .driver_data = (kernel_ulong_t)&machxo2_spi_data,
> > + }, {},
> > +};
> > +MODULE_DEVICE_TABLE(spi, sysconfig_spi_ids);
> > +
> > +#if IS_ENABLED(CONFIG_OF)
> > +static const struct of_device_id sysconfig_of_ids[] = {
> > + {
> > + .compatible = "lattice,sysconfig-ecp5",
> > + .data = &ecp5_spi_data,
> > + }, {
> > + .compatible = "lattice,sysconfig-machxo2",
> > + .data = &machxo2_spi_data,
> > + }, {},
> > +};
> > +MODULE_DEVICE_TABLE(of, sysconfig_of_ids);
> > +#endif /* IS_ENABLED(CONFIG_OF) */
> > +
> > +static struct spi_driver lattice_sysconfig_driver = {
> > + .probe = sysconfig_spi_probe,
> > + .id_table = sysconfig_spi_ids,
> > + .driver = {
> > + .name = "lattice_sysconfig_spi_fpga_mgr",
> > + .of_match_table = of_match_ptr(sysconfig_of_ids),
> > + },
> > +};
> > +
> > +module_spi_driver(lattice_sysconfig_driver);
> > +
> > +MODULE_DESCRIPTION("Lattice sysCONFIG Slave SPI FPGA Manager");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/fpga/sysconfig.c b/drivers/fpga/sysconfig.c
> > new file mode 100644
> > index 000000000000..af697203ed5d
> > --- /dev/null
> > +++ b/drivers/fpga/sysconfig.c
> > @@ -0,0 +1,528 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Lattice FPGA sysCONFIG interface functions independent of port type.
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/fpga/fpga-mgr.h>
> > +#include <linux/gpio/consumer.h>
> > +
> > +#include "sysconfig.h"
> > +
> > +const struct sysconfig_fpga_priv ecp5_data = {
> > + .isc_enable_operand = 0x00,
> > + .burst_write = true,
> > + .internal_flash = false,
>
> Sorry, we still have gaps here.
> Machxo2 reprograming can be splitted to 2 steps, flash reprograming &
> FPGA reconfiguration from flash,
Keep in mind that, according to MachXO2 docs, ISC_ENABLE, ISC_ERASE and
LSC_INIT_ADDR commands still needs to be issued for writing internal
flash.
> and now I think it is not a good idea
> to include the 2 steps in an FPGA manager. Flash reprograming is actually
> not the job for FPGA manager, it could be done by other existing
> interfaces. And I also don't want to support it in this new driver. FPGA
> reconfiguration from flash, as we discussed previously, could be a
> FPGA manager feature, but could be considered later.
>
> In another word, only to implement FPGA reconfiguration from bitstream
> file, we don't even need to support machxo2 now.
>
Ok, I don't mind to drop MachXO2 support, I can't test it anyway.
> For this sysconfig_fpga_priv, isc_enable_operand & internal_flash are
> not need here, they are for flash reprograming actually. burst_write
> is the only concern, any finding about whether page write works?
>
No, I didn't succeed in paged write to SRAM on ECP5.
> Thanks,
> Yilun
>
> > +};
> > +
> > +const struct sysconfig_fpga_priv machxo2_data = {
> > + .isc_enable_operand = 0x08,
> > + .burst_write = false,
> > + .internal_flash = true,
> > +};
> > +
> > +static int sysconfig_cmd_write(struct sysconfig_priv *priv, const void *buf,
> > + size_t buf_len)
> > +{
> > + return priv->command_write(priv, buf, buf_len);
> > +}
> > +
> > +static int sysconfig_cmd_write_with_data(struct sysconfig_priv *priv,
> > + const void *cmd, size_t cmd_len,
> > + const void *data, size_t data_len)
> > +{
> > + return priv->command_write_with_data(priv, cmd, cmd_len, data, data_len);
> > +}
> > +
> > +static int sysconfig_cmd_write_then_read(struct sysconfig_priv *priv,
> > + const void *tx_buf, size_t tx_len,
> > + void *rx_buf, size_t rx_len)
> > +{
> > + return priv->command_write_then_read(priv, tx_buf, tx_len, rx_buf, rx_len);
> > +}
> > +
> > +static int sysconfig_read_busy(struct sysconfig_priv *priv)
> > +{
> > + const u8 lsc_check_busy[] = SYSCONFIG_LSC_CHECK_BUSY;
> > + u8 busy;
> > + int ret;
> > +
> > + ret = sysconfig_cmd_write_then_read(priv, lsc_check_busy,
> > + sizeof(lsc_check_busy),
> > + &busy, sizeof(busy));
> > +
> > + return ret ? : busy;
> > +}
> > +
> > +static int sysconfig_poll_busy(struct sysconfig_priv *priv)
> > +{
> > + size_t retries = SYSCONFIG_POLL_RETRIES;
> > + int ret;
> > +
> > + while (retries--) {
> > + ret = sysconfig_read_busy(priv);
> > + if (ret <= 0)
> > + return ret;
> > +
> > + usleep_range(SYSCONFIG_POLL_INTERVAL_US,
> > + SYSCONFIG_POLL_INTERVAL_US * 2);
> > + }
> > +
> > + return -EBUSY;
> > +}
> > +
> > +static int sysconfig_read_status(struct sysconfig_priv *priv, u32 *status)
> > +{
> > + const u8 lsc_read_status[] = SYSCONFIG_LSC_READ_STATUS;
> > + __be32 device_status;
> > + int ret;
> > +
> > + ret = sysconfig_cmd_write_then_read(priv, lsc_read_status,
> > + sizeof(lsc_read_status),
> > + &device_status,
> > + sizeof(device_status));
> > + if (ret)
> > + return ret;
> > +
> > + *status = be32_to_cpu(device_status);
> > +
> > + return 0;
> > +}
> > +
> > +static int sysconfig_poll_status(struct sysconfig_priv *priv, u32 *status)
> > +{
> > + int ret = sysconfig_poll_busy(priv);
> > +
> > + if (ret)
> > + return ret;
> > +
> > + return sysconfig_read_status(priv, status);
> > +}
> > +
> > +static int sysconfig_poll_gpio(struct gpio_desc *gpio, bool is_active)
> > +{
> > + size_t retries = SYSCONFIG_POLL_RETRIES;
> > + int value;
> > +
> > + while (retries--) {
> > + value = gpiod_get_value(gpio);
> > + if (value < 0)
> > + return value;
> > +
> > + if ((is_active && value) || (!is_active && !value))
> > + return 0;
> > + }
> > +
> > + return -ETIMEDOUT;
> > +}
> > +
> > +static int sysconfig_gpio_refresh(struct sysconfig_priv *priv)
> > +{
> > + struct gpio_desc *program = priv->program;
> > + struct gpio_desc *init = priv->init;
> > + struct gpio_desc *done = priv->done;
> > + int ret;
> > +
> > + /* Enter init mode */
> > + gpiod_set_value(program, 1);
> > +
> > + ret = sysconfig_poll_gpio(init, true);
> > + if (!ret)
> > + ret = sysconfig_poll_gpio(done, false);
> > +
> > + if (ret)
> > + return ret;
> > +
> > + /* Enter program mode */
> > + gpiod_set_value(program, 0);
> > +
> > + return sysconfig_poll_gpio(init, false);
> > +}
> > +
> > +static int sysconfig_lsc_refresh(struct sysconfig_priv *priv)
> > +{
> > + static const u8 lsc_refresh[] = SYSCONFIG_LSC_REFRESH;
> > + int ret;
> > +
> > + ret = sysconfig_cmd_write(priv, lsc_refresh, sizeof(lsc_refresh));
> > + if (ret)
> > + return ret;
> > +
> > + usleep_range(4000, 8000);
> > +
> > + return 0;
> > +}
> > +
> > +static int sysconfig_refresh(struct sysconfig_priv *priv)
> > +{
> > + struct gpio_desc *program = priv->program;
> > + struct gpio_desc *init = priv->init;
> > + struct gpio_desc *done = priv->done;
> > +
> > + if (program && init && done)
> > + return sysconfig_gpio_refresh(priv);
> > +
> > + return sysconfig_lsc_refresh(priv);
> > +}
> > +
> > +static int sysconfig_isc_enable(struct sysconfig_priv *priv)
> > +{
> > + const struct sysconfig_fpga_priv *fpga_priv = priv->fpga_priv;
> > + u8 isc_enable[] = SYSCONFIG_ISC_ENABLE;
> > + u32 status;
> > + int ret;
> > +
> > + isc_enable[1] = fpga_priv->isc_enable_operand;
> > +
> > + ret = sysconfig_cmd_write(priv, isc_enable, sizeof(isc_enable));
> > + if (ret)
> > + return ret;
> > +
> > + ret = sysconfig_poll_status(priv, &status);
> > + if (ret || (status & SYSCONFIG_STATUS_FAIL))
> > + return ret ? : -EFAULT;
> > +
> > + return 0;
> > +}
> > +
> > +static int sysconfig_isc_erase(struct sysconfig_priv *priv)
> > +{
> > + const struct sysconfig_fpga_priv *fpga_priv = priv->fpga_priv;
> > + u8 isc_erase[] = SYSCONFIG_ISC_ERASE;
> > + u32 status;
> > + int ret;
> > +
> > + isc_erase[1] = SYSCONFIG_ISC_ERASE_SRAM;
> > +
> > + if (fpga_priv->internal_flash)
> > + isc_erase[1] |= SYSCONFIG_ISC_ERASE_FLASH;
> > +
> > + ret = sysconfig_cmd_write(priv, isc_erase, sizeof(isc_erase));
> > + if (ret)
> > + return ret;
> > +
> > + ret = sysconfig_poll_status(priv, &status);
> > + if (ret || (status & SYSCONFIG_STATUS_FAIL))
> > + return ret ? : -EFAULT;
> > +
> > + return 0;
> > +}
> > +
> > +static int sysconfig_isc_init(struct sysconfig_priv *priv)
> > +{
> > + int ret = sysconfig_isc_enable(priv);
> > +
> > + if (ret)
> > + return ret;
> > +
> > + return sysconfig_isc_erase(priv);
> > +}
> > +
> > +static int sysconfig_lsc_init_addr(struct sysconfig_priv *priv)
> > +{
> > + const u8 lsc_init_addr[] = SYSCONFIG_LSC_INIT_ADDR;
> > +
> > + return sysconfig_cmd_write(priv, lsc_init_addr, sizeof(lsc_init_addr));
> > +}
> > +
> > +static int sysconfig_burst_write_init(struct sysconfig_priv *priv)
> > +{
> > + if (priv->bitstream_burst_write_init)
> > + return priv->bitstream_burst_write_init(priv);
> > +
> > + return 0;
> > +}
> > +
> > +static int sysconfig_burst_write_complete(struct sysconfig_priv *priv)
> > +{
> > + if (priv->bitstream_burst_write_complete)
> > + return priv->bitstream_burst_write_complete(priv);
> > +
> > + return 0;
> > +}
> > +
> > +static int sysconfig_bitstream_burst_write(struct sysconfig_priv *priv,
> > + const char *buf, size_t count)
> > +{
> > + int ret;
> > +
> > + if (priv->bitstream_burst_write)
> > + ret = priv->bitstream_burst_write(priv, buf, count);
> > + else
> > + ret = -EOPNOTSUPP;
> > +
> > + if (ret)
> > + sysconfig_burst_write_complete(priv);
> > +
> > + return ret;
> > +}
> > +
> > +static int sysconfig_bitstream_paged_write(struct sysconfig_priv *priv,
> > + const char *buf, size_t count)
> > +{
> > + const u8 lsc_progincr[] = SYSCONFIG_LSC_PROG_INCR_NV;
> > + size_t i;
> > + int ret;
> > +
> > + if (count % SYSCONFIG_PAGE_SIZE)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < count; i += SYSCONFIG_PAGE_SIZE) {
> > + ret = sysconfig_cmd_write_with_data(priv, lsc_progincr,
> > + sizeof(lsc_progincr),
> > + buf + i, SYSCONFIG_PAGE_SIZE);
> > + if (!ret)
> > + ret = sysconfig_poll_busy(priv);
> > +
> > + if (ret)
> > + break;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int sysconfig_isc_prog_done(struct sysconfig_priv *priv)
> > +{
> > + const u8 isc_prog_done[] = SYSCONFIG_ISC_PROGRAM_DONE;
> > + u32 status;
> > + int ret;
> > +
> > + ret = sysconfig_cmd_write(priv, isc_prog_done, sizeof(isc_prog_done));
> > + if (ret)
> > + return ret;
> > +
> > + ret = sysconfig_poll_status(priv, &status);
> > + if (ret)
> > + return ret;
> > +
> > + if (status & SYSCONFIG_STATUS_DONE)
> > + return 0;
> > +
> > + return -EFAULT;
> > +}
> > +
> > +static int sysconfig_isc_disable(struct sysconfig_priv *priv)
> > +{
> > + const u8 isc_disable[] = SYSCONFIG_ISC_DISABLE;
> > +
> > + return sysconfig_cmd_write(priv, isc_disable, sizeof(isc_disable));
> > +}
> > +
> > +static void sysconfig_cleanup(struct sysconfig_priv *priv)
> > +{
> > + sysconfig_isc_erase(priv);
> > + sysconfig_refresh(priv);
> > +}
> > +
> > +static int sysconfig_isc_finish(struct sysconfig_priv *priv)
> > +{
> > + const struct sysconfig_fpga_priv *fpga_priv = priv->fpga_priv;
> > + int ret, retries = SYSCONFIG_REFRESH_RETRIES;
> > + struct gpio_desc *done_gpio = priv->done;
> > + u32 status;
> > +
> > + if (done_gpio) {
> > + ret = sysconfig_isc_disable(priv);
> > + if (ret)
> > + return ret;
> > +
> > + return sysconfig_poll_gpio(done_gpio, true);
> > + }
> > +
> > + while (retries--) {
> > + ret = sysconfig_poll_status(priv, &status);
> > + if (ret)
> > + break;
> > +
> > + if ((status & SYSCONFIG_STATUS_DONE) &&
> > + !(status & SYSCONFIG_STATUS_BUSY) &&
> > + !(status & SYSCONFIG_STATUS_ERR)) {
> > + return sysconfig_isc_disable(priv);
> > + }
> > +
> > + if (fpga_priv->internal_flash) {
> > + ret = sysconfig_refresh(priv);
> > + if (ret)
> > + break;
> > + }
> > + }
> > +
> > + return -EFAULT;
> > +}
> > +
> > +static enum fpga_mgr_states sysconfig_ops_state(struct fpga_manager *mgr)
> > +{
> > + struct sysconfig_priv *priv = mgr->priv;
> > + struct gpio_desc *done = priv->done;
> > + u32 status;
> > + int ret;
> > +
> > + if (done && (gpiod_get_value(done) > 0))
> > + return FPGA_MGR_STATE_OPERATING;
> > +
> > + ret = sysconfig_read_status(priv, &status);
> > + if (!ret && (status & SYSCONFIG_STATUS_DONE))
> > + return FPGA_MGR_STATE_OPERATING;
> > +
> > + return FPGA_MGR_STATE_UNKNOWN;
> > +}
> > +
> > +static int sysconfig_ops_write_init(struct fpga_manager *mgr,
> > + struct fpga_image_info *info,
> > + const char *buf, size_t count)
> > +{
> > + const struct sysconfig_fpga_priv *fpga_priv;
> > + struct sysconfig_priv *priv;
> > + struct device *dev;
> > + int ret;
> > +
> > + dev = &mgr->dev;
> > + priv = mgr->priv;
> > + fpga_priv = priv->fpga_priv;
> > +
> > + if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
> > + dev_err(dev, "Partial reconfiguration is not supported\n");
> > + return -EOPNOTSUPP;
> > + }
> > +
> > + if (!fpga_priv->internal_flash) {
> > + /* Write directly to SRAM */
> > + ret = sysconfig_refresh(priv);
> > + if (ret) {
> > + dev_err(dev, "Failed to go to program mode\n");
> > + return ret;
> > + }
> > + }
> > +
> > + /* Enter ISC mode */
> > + ret = sysconfig_isc_init(priv);
> > + if (ret) {
> > + dev_err(dev, "Failed to go to ISC mode\n");
> > + return ret;
> > + }
> > +
> > + /* Initialize the Address Shift Register */
> > + ret = sysconfig_lsc_init_addr(priv);
> > + if (ret) {
> > + dev_err(dev,
> > + "Failed to initialize the Address Shift Register\n");
> > + return ret;
> > + }
> > +
> > + if (fpga_priv->burst_write) {
> > + /* Prepare for bitstream burst write */
> > + ret = sysconfig_burst_write_init(priv);
> > + if (ret)
> > + dev_err(dev,
> > + "Failed to prepare for bitstream burst write\n");
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int sysconfig_ops_write(struct fpga_manager *mgr, const char *buf,
> > + size_t count)
> > +{
> > + const struct sysconfig_fpga_priv *fpga_priv;
> > + struct sysconfig_priv *priv;
> > +
> > + priv = mgr->priv;
> > + fpga_priv = priv->fpga_priv;
> > +
> > + if (fpga_priv->burst_write)
> > + return sysconfig_bitstream_burst_write(priv, buf, count);
> > +
> > + return sysconfig_bitstream_paged_write(priv, buf, count);
> > +}
> > +
> > +static int sysconfig_ops_write_complete(struct fpga_manager *mgr,
> > + struct fpga_image_info *info)
> > +{
> > + const struct sysconfig_fpga_priv *fpga_priv;
> > + struct sysconfig_priv *priv;
> > + struct device *dev;
> > + int ret;
> > +
> > + dev = &mgr->dev;
> > + priv = mgr->priv;
> > + fpga_priv = priv->fpga_priv;
> > +
> > + if (fpga_priv->burst_write) {
> > + ret = sysconfig_burst_write_complete(priv);
> > + if (!ret)
> > + ret = sysconfig_poll_busy(priv);
> > +
> > + if (ret) {
> > + dev_err(dev,
> > + "Error while waiting bitstream write to finish\n");
> > + goto fail;
> > + }
> > + }
> > +
> > + if (fpga_priv->internal_flash) {
> > + ret = sysconfig_isc_prog_done(priv);
> > + if (!ret)
> > + ret = sysconfig_refresh(priv);
> > +
> > + if (ret) {
> > + dev_err(dev, "Failed to enable Self-Download Mode\n");
> > + goto fail;
> > + }
> > + }
> > +
> > + ret = sysconfig_isc_finish(priv);
> > +
> > +fail:
> > + if (ret)
> > + sysconfig_cleanup(priv);
> > +
> > + return ret;
> > +}
> > +
> > +static const struct fpga_manager_ops sysconfig_fpga_mgr_ops = {
> > + .state = sysconfig_ops_state,
> > + .write_init = sysconfig_ops_write_init,
> > + .write = sysconfig_ops_write,
> > + .write_complete = sysconfig_ops_write_complete,
> > +};
> > +
> > +int sysconfig_probe(struct sysconfig_priv *priv)
> > +{
> > + struct gpio_desc *program, *init, *done;
> > + struct device *dev = priv->dev;
> > + struct fpga_manager *mgr;
> > + int ret;
> > +
> > + if (!dev)
> > + return -ENODEV;
> > +
> > + program = devm_gpiod_get_optional(dev, "program", GPIOD_OUT_LOW);
> > + if (IS_ERR(program)) {
> > + ret = PTR_ERR(program);
> > + dev_err(dev, "Failed to get PROGRAM GPIO: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + init = devm_gpiod_get_optional(dev, "init", GPIOD_IN);
> > + if (IS_ERR(init)) {
> > + ret = PTR_ERR(init);
> > + dev_err(dev, "Failed to get INIT GPIO: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + done = devm_gpiod_get_optional(dev, "done", GPIOD_IN);
> > + if (IS_ERR(done)) {
> > + ret = PTR_ERR(done);
> > + dev_err(dev, "Failed to get DONE GPIO: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + priv->program = program;
> > + priv->init = init;
> > + priv->done = done;
> > +
> > + mgr = devm_fpga_mgr_register(dev, "Lattice sysCONFIG FPGA Manager",
> > + &sysconfig_fpga_mgr_ops, priv);
> > +
> > + return PTR_ERR_OR_ZERO(mgr);
> > +}
> > diff --git a/drivers/fpga/sysconfig.h b/drivers/fpga/sysconfig.h
> > new file mode 100644
> > index 000000000000..decb0958ee51
> > --- /dev/null
> > +++ b/drivers/fpga/sysconfig.h
> > @@ -0,0 +1,62 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef __LATTICE_SYSCONFIG_H
> > +#define __LATTICE_SYSCONFIG_H
> > +
> > +#define SYSCONFIG_ISC_ENABLE {0xC6, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_ISC_DISABLE {0x26, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_ISC_ERASE {0x0E, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_ISC_PROGRAM_DONE {0x5E, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_LSC_READ_STATUS {0x3C, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_LSC_CHECK_BUSY {0xF0, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_LSC_REFRESH {0x79, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_LSC_INIT_ADDR {0x46, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_LSC_BITSTREAM_BURST {0x7a, 0x00, 0x00, 0x00}
> > +#define SYSCONFIG_LSC_PROG_INCR_NV {0x70, 0x00, 0x00, 0x01}
> > +
> > +#define SYSCONFIG_ISC_ERASE_SRAM BIT(0)
> > +#define SYSCONFIG_ISC_ERASE_FLASH BIT(2)
> > +
> > +#define SYSCONFIG_STATUS_DONE BIT(8)
> > +#define SYSCONFIG_STATUS_BUSY BIT(12)
> > +#define SYSCONFIG_STATUS_FAIL BIT(13)
> > +#define SYSCONFIG_STATUS_ERR (BIT(23) | BIT(24) | BIT(25))
> > +
> > +#define SYSCONFIG_REFRESH_RETRIES 16
> > +#define SYSCONFIG_POLL_RETRIES 1000000
> > +#define SYSCONFIG_POLL_INTERVAL_US 30
> > +
> > +#define SYSCONFIG_PAGE_SIZE 16
> > +
> > +struct sysconfig_fpga_priv {
> > + u8 isc_enable_operand;
> > + bool burst_write;
> > + bool internal_flash;
> > +};
> > +
> > +extern const struct sysconfig_fpga_priv ecp5_data;
> > +extern const struct sysconfig_fpga_priv machxo2_data;
> > +
> > +struct sysconfig_priv {
> > + const struct sysconfig_fpga_priv *fpga_priv;
> > + struct gpio_desc *program;
> > + struct gpio_desc *init;
> > + struct gpio_desc *done;
> > + struct device *dev;
> > + int (*command_write)(struct sysconfig_priv *priv,
> > + const void *tx_buf, size_t tx_len);
> > + int (*command_write_with_data)(struct sysconfig_priv *priv,
> > + const void *cmd_buf, size_t cmd_len,
> > + const void *data_buf, size_t data_len);
> > + int (*command_write_then_read)(struct sysconfig_priv *priv,
> > + const void *tx_buf, size_t tx_len,
> > + void *rx_buf, size_t rx_len);
> > + int (*bitstream_burst_write_init)(struct sysconfig_priv *priv);
> > + int (*bitstream_burst_write)(struct sysconfig_priv *priv,
> > + const char *tx_buf, size_t tx_len);
> > + int (*bitstream_burst_write_complete)(struct sysconfig_priv *priv);
> > +};
> > +
> > +int sysconfig_probe(struct sysconfig_priv *priv);
> > +
> > +#endif /* __LATTICE_SYSCONFIG_H */
> > --
> > 2.37.3
> >
> >
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