On 2022-12-23 at 17:28:50 +0530, Nava kishore Manne wrote: > Adds status interface for zynqmp-fpga, It's a read only interface > which allows the user to get the Programmable Logic(PL) configuration > status. > > Usage: > To read the Programmable Logic(PL) configuration status > cat /sys/class/fpga_manager/<fpga>/device/status > > Signed-off-by: Nava kishore Manne <nava.kishore.manne@xxxxxxx> > --- > Changes for v2: > - Updated status messages handling logic as suggested by Xu Yilun. > > Changes for v3: > - Updated status interface handling logic (Restrict the status > interface to the device-specific instead of handled by the core) > as suggested by Xu Yilun. > > Changes for v4: > - Limit the error strings to one word for each as suggested by > Xu Yilun Please fix the comments from Greg, https://lore.kernel.org/all/Y0fYjyXrMEo6M76k@xxxxxxxxx/ > > drivers/fpga/zynqmp-fpga.c | 87 ++++++++++++++++++++++++++++++++++++++ > 1 file changed, 87 insertions(+) > > diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c > index c60f20949c47..81d3e18527ee 100644 > --- a/drivers/fpga/zynqmp-fpga.c > +++ b/drivers/fpga/zynqmp-fpga.c > @@ -15,6 +15,37 @@ > /* Constant Definitions */ > #define IXR_FPGA_DONE_MASK BIT(3) > > +/* Error Register */ > +#define IXR_FPGA_ERR_CRC_ERR BIT(0) > +#define IXR_FPGA_ERR_SECURITY_ERR BIT(16) > + > +/* Signal Status Register */ > +#define IXR_FPGA_END_OF_STARTUP BIT(4) > +#define IXR_FPGA_GST_CFG_B BIT(5) > +#define IXR_FPGA_INIT_B_INTERNAL BIT(11) > +#define IXR_FPGA_DONE_INTERNAL_SIGNAL BIT(13) > + > +/* FPGA error status. */ > +enum { > + ZYNQMP_FPGA_STATUS_CRC_ERR, > + ZYNQMP_FPGA_STATUS_SECURITY_ERR, > + ZYNQMP_FPGA_STATUS_DEVICE_INIT_ERR, > + ZYNQMP_FPGA_STATUS_SIGNAL_ERR, > + ZYNQMP_FPGA_STATUS_HIGH_Z_STATE_ERR, > + ZYNQMP_FPGA_STATUS_EOS_ERR, > + ZYNQMP_FPGA_MGR_STATUS_FIRMWARE_REQ_ERR, > +}; > + > +static const char * const zynqmp_fpga_error_statuses[] = { > + [ZYNQMP_FPGA_STATUS_CRC_ERR] = "CRC-Error", > + [ZYNQMP_FPGA_STATUS_SECURITY_ERR] = "Security-Error", > + [ZYNQMP_FPGA_STATUS_DEVICE_INIT_ERR] = "Initialization-Error", > + [ZYNQMP_FPGA_STATUS_SIGNAL_ERR] = "Internal-Signal-Error", > + [ZYNQMP_FPGA_STATUS_HIGH_Z_STATE_ERR] = "I/Os-High-Z-state", > + [ZYNQMP_FPGA_STATUS_EOS_ERR] = "Sequence-Error", > + [ZYNQMP_FPGA_MGR_STATUS_FIRMWARE_REQ_ERR] = "Firmware-Error", > +}; > + > /** > * struct zynqmp_fpga_priv - Private data structure > * @dev: Device data structure > @@ -77,6 +108,54 @@ static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr) > return FPGA_MGR_STATE_UNKNOWN; > } > > +static ssize_t status_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + unsigned long status = 0; > + ssize_t len = 0; > + u32 reg_val; > + int ret; > + u8 i; > + > + ret = zynqmp_pm_fpga_get_config_status(®_val); > + if (!ret) { > + if (reg_val & IXR_FPGA_ERR_CRC_ERR) > + status |= ZYNQMP_FPGA_STATUS_CRC_ERR; > + if (reg_val & IXR_FPGA_ERR_SECURITY_ERR) > + status |= ZYNQMP_FPGA_STATUS_SECURITY_ERR; > + if (!(reg_val & IXR_FPGA_INIT_B_INTERNAL)) > + status |= ZYNQMP_FPGA_STATUS_DEVICE_INIT_ERR; > + if (!(reg_val & IXR_FPGA_DONE_INTERNAL_SIGNAL)) > + status |= ZYNQMP_FPGA_STATUS_SIGNAL_ERR; > + if (!(reg_val & IXR_FPGA_GST_CFG_B)) > + status |= ZYNQMP_FPGA_STATUS_HIGH_Z_STATE_ERR; > + if (!(reg_val & IXR_FPGA_END_OF_STARTUP)) > + status |= ZYNQMP_FPGA_STATUS_EOS_ERR; > + } else { > + status = ZYNQMP_FPGA_MGR_STATUS_FIRMWARE_REQ_ERR; > + } > + > + for_each_set_bit(i, &status, ARRAY_SIZE(zynqmp_fpga_error_statuses)) > + len += sysfs_emit_at(buf, len, "%s ", > + zynqmp_fpga_error_statuses[i]); > + > + if (len) > + buf[len - 1] = '\n'; > + > + return len; > +} > + > +static DEVICE_ATTR_RO(status); > + > +static struct attribute *zynqmp_fpga_device_attrs[] = { > + &dev_attr_status.attr, > + NULL, > +}; > + > +static const struct attribute_group zynqmp_fpga_attr_group = { > + .attrs = zynqmp_fpga_device_attrs, > +}; > + > static const struct fpga_manager_ops zynqmp_fpga_ops = { > .state = zynqmp_fpga_ops_state, > .write_init = zynqmp_fpga_ops_write_init, > @@ -88,6 +167,7 @@ static int zynqmp_fpga_probe(struct platform_device *pdev) > struct device *dev = &pdev->dev; > struct zynqmp_fpga_priv *priv; > struct fpga_manager *mgr; > + int ret; > > priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > if (!priv) > @@ -95,6 +175,13 @@ static int zynqmp_fpga_probe(struct platform_device *pdev) > > priv->dev = dev; > > + /* Add the device attributes */ > + ret = sysfs_create_group(&dev->kobj, &zynqmp_fpga_attr_group); > + if (ret) { > + dev_err(dev, "Error creating sysfs files\n"); > + return ret; > + } > + > mgr = devm_fpga_mgr_register(dev, "Xilinx ZynqMP FPGA Manager", > &zynqmp_fpga_ops, priv); > return PTR_ERR_OR_ZERO(mgr); > -- > 2.25.1 >
