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-rw-r--r--drivers/fpga/dfl-afu-region.c1
-rw-r--r--drivers/fpga/dfl-afu.h2
-rw-r--r--drivers/fpga/dfl-fme-perf.c2
-rw-r--r--drivers/fpga/dfl-fme-pr.c4
-rw-r--r--drivers/fpga/dfl-fme-pr.h2
-rw-r--r--drivers/fpga/dfl.c4
-rw-r--r--drivers/fpga/dfl.h2
-rw-r--r--drivers/fpga/fpga-bridge.c11
-rw-r--r--drivers/fpga/microchip-spi.c145
9 files changed, 95 insertions, 78 deletions
diff --git a/drivers/fpga/dfl-afu-region.c b/drivers/fpga/dfl-afu-region.c
index 0804b7a0c298..2e7b41629406 100644
--- a/drivers/fpga/dfl-afu-region.c
+++ b/drivers/fpga/dfl-afu-region.c
@@ -39,6 +39,7 @@ static struct dfl_afu_mmio_region *get_region_by_index(struct dfl_afu *afu,
/**
* afu_mmio_region_add - add a mmio region to given feature dev.
*
+ * @pdata: afu platform device's pdata.
* @region_index: region index.
* @region_size: region size.
* @phys: region's physical address of this region.
diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h
index e5020e2b1f3d..674e9772f0ea 100644
--- a/drivers/fpga/dfl-afu.h
+++ b/drivers/fpga/dfl-afu.h
@@ -41,7 +41,7 @@ struct dfl_afu_mmio_region {
};
/**
- * struct fpga_afu_dma_region - afu DMA region data structure
+ * struct dfl_afu_dma_region - afu DMA region data structure
*
* @user_addr: region userspace virtual address.
* @length: region length.
diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c
index 587c82be12f7..7422d2bc6f37 100644
--- a/drivers/fpga/dfl-fme-perf.c
+++ b/drivers/fpga/dfl-fme-perf.c
@@ -141,7 +141,7 @@
* @fab_port_id: used to indicate current working mode of fabric counters.
* @fab_lock: lock to protect fabric counters working mode.
* @cpu: active CPU to which the PMU is bound for accesses.
- * @cpuhp_node: node for CPU hotplug notifier link.
+ * @node: node for CPU hotplug notifier link.
* @cpuhp_state: state for CPU hotplug notification;
*/
struct fme_perf_priv {
diff --git a/drivers/fpga/dfl-fme-pr.c b/drivers/fpga/dfl-fme-pr.c
index d61ce9a18879..cdcf6dea4cc9 100644
--- a/drivers/fpga/dfl-fme-pr.c
+++ b/drivers/fpga/dfl-fme-pr.c
@@ -164,7 +164,7 @@ free_exit:
/**
* dfl_fme_create_mgr - create fpga mgr platform device as child device
- *
+ * @feature: sub feature info
* @pdata: fme platform_device's pdata
*
* Return: mgr platform device if successful, and error code otherwise.
@@ -273,7 +273,7 @@ static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
}
/**
- * dfl_fme_destroy_bridge - destroy all fpga bridge platform device
+ * dfl_fme_destroy_bridges - destroy all fpga bridge platform device
* @pdata: fme platform device's pdata
*/
static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
diff --git a/drivers/fpga/dfl-fme-pr.h b/drivers/fpga/dfl-fme-pr.h
index 096a699089d3..761f80f63312 100644
--- a/drivers/fpga/dfl-fme-pr.h
+++ b/drivers/fpga/dfl-fme-pr.h
@@ -58,7 +58,7 @@ struct dfl_fme_bridge {
};
/**
- * struct dfl_fme_bridge_pdata - platform data for FME bridge platform device.
+ * struct dfl_fme_br_pdata - platform data for FME bridge platform device.
*
* @cdev: container device.
* @port_id: port id.
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 0a4227bc9462..b010f0a83a78 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -46,7 +46,7 @@ static const char *dfl_pdata_key_strings[DFL_ID_MAX] = {
};
/**
- * dfl_dev_info - dfl feature device information.
+ * struct dfl_dev_info - dfl feature device information.
* @name: name string of the feature platform device.
* @dfh_id: id value in Device Feature Header (DFH) register by DFL spec.
* @id: idr id of the feature dev.
@@ -68,7 +68,7 @@ static struct dfl_dev_info dfl_devs[] = {
};
/**
- * dfl_chardev_info - chardev information of dfl feature device
+ * struct dfl_chardev_info - chardev information of dfl feature device
* @name: nmae string of the char device.
* @devt: devt of the char device.
*/
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 20eaddce6988..1d724a28f00a 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -267,7 +267,7 @@ struct dfl_feature_irq_ctx {
*
* @dev: ptr to pdev of the feature device which has the sub feature.
* @id: sub feature id.
- * @revision: revisition of the instance of a feature.
+ * @revision: revision of this sub feature.
* @resource_index: each sub feature has one mmio resource for its registers.
* this index is used to find its mmio resource from the
* feature dev (platform device)'s resources.
diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
index 727704431f61..5cd40acab5bf 100644
--- a/drivers/fpga/fpga-bridge.c
+++ b/drivers/fpga/fpga-bridge.c
@@ -293,12 +293,15 @@ static ssize_t state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fpga_bridge *bridge = to_fpga_bridge(dev);
- int enable = 1;
+ int state = 1;
- if (bridge->br_ops && bridge->br_ops->enable_show)
- enable = bridge->br_ops->enable_show(bridge);
+ if (bridge->br_ops && bridge->br_ops->enable_show) {
+ state = bridge->br_ops->enable_show(bridge);
+ if (state < 0)
+ return state;
+ }
- return sprintf(buf, "%s\n", enable ? "enabled" : "disabled");
+ return sysfs_emit(buf, "%s\n", state ? "enabled" : "disabled");
}
static DEVICE_ATTR_RO(name);
diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c
index 7436976ea904..d6070e7f5205 100644
--- a/drivers/fpga/microchip-spi.c
+++ b/drivers/fpga/microchip-spi.c
@@ -6,6 +6,7 @@
#include <asm/unaligned.h>
#include <linux/delay.h>
#include <linux/fpga/fpga-mgr.h>
+#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
@@ -33,7 +34,7 @@
#define MPF_BITS_PER_COMPONENT_SIZE 22
-#define MPF_STATUS_POLL_RETRIES 10000
+#define MPF_STATUS_POLL_TIMEOUT (2 * USEC_PER_SEC)
#define MPF_STATUS_BUSY BIT(0)
#define MPF_STATUS_READY BIT(1)
#define MPF_STATUS_SPI_VIOLATION BIT(2)
@@ -42,46 +43,55 @@
struct mpf_priv {
struct spi_device *spi;
bool program_mode;
+ u8 tx __aligned(ARCH_KMALLOC_MINALIGN);
+ u8 rx;
};
-static int mpf_read_status(struct spi_device *spi)
+static int mpf_read_status(struct mpf_priv *priv)
{
- u8 status = 0, status_command = MPF_SPI_READ_STATUS;
- struct spi_transfer xfers[2] = { 0 };
- int ret;
-
/*
* HW status is returned on MISO in the first byte after CS went
* active. However, first reading can be inadequate, so we submit
* two identical SPI transfers and use result of the later one.
*/
- xfers[0].tx_buf = &status_command;
- xfers[1].tx_buf = &status_command;
- xfers[0].rx_buf = &status;
- xfers[1].rx_buf = &status;
- xfers[0].len = 1;
- xfers[1].len = 1;
- xfers[0].cs_change = 1;
+ struct spi_transfer xfers[2] = {
+ {
+ .tx_buf = &priv->tx,
+ .rx_buf = &priv->rx,
+ .len = 1,
+ .cs_change = 1,
+ }, {
+ .tx_buf = &priv->tx,
+ .rx_buf = &priv->rx,
+ .len = 1,
+ },
+ };
+ u8 status;
+ int ret;
- ret = spi_sync_transfer(spi, xfers, 2);
+ priv->tx = MPF_SPI_READ_STATUS;
+
+ ret = spi_sync_transfer(priv->spi, xfers, 2);
+ if (ret)
+ return ret;
+
+ status = priv->rx;
if ((status & MPF_STATUS_SPI_VIOLATION) ||
(status & MPF_STATUS_SPI_ERROR))
- ret = -EIO;
+ return -EIO;
- return ret ? : status;
+ return status;
}
static enum fpga_mgr_states mpf_ops_state(struct fpga_manager *mgr)
{
struct mpf_priv *priv = mgr->priv;
- struct spi_device *spi;
bool program_mode;
int status;
- spi = priv->spi;
program_mode = priv->program_mode;
- status = mpf_read_status(spi);
+ status = mpf_read_status(priv);
if (!program_mode && !status)
return FPGA_MGR_STATE_OPERATING;
@@ -185,52 +195,53 @@ static int mpf_ops_parse_header(struct fpga_manager *mgr,
return 0;
}
-/* Poll HW status until busy bit is cleared and mask bits are set. */
-static int mpf_poll_status(struct spi_device *spi, u8 mask)
+static int mpf_poll_status(struct mpf_priv *priv, u8 mask)
{
- int status, retries = MPF_STATUS_POLL_RETRIES;
-
- while (retries--) {
- status = mpf_read_status(spi);
- if (status < 0)
- return status;
+ int ret, status;
- if (status & MPF_STATUS_BUSY)
- continue;
-
- if (!mask || (status & mask))
- return status;
- }
+ /*
+ * Busy poll HW status. Polling stops if any of the following
+ * conditions are met:
+ * - timeout is reached
+ * - mpf_read_status() returns an error
+ * - busy bit is cleared AND mask bits are set
+ */
+ ret = read_poll_timeout(mpf_read_status, status,
+ (status < 0) ||
+ ((status & (MPF_STATUS_BUSY | mask)) == mask),
+ 0, MPF_STATUS_POLL_TIMEOUT, false, priv);
+ if (ret < 0)
+ return ret;
- return -EBUSY;
+ return status;
}
-static int mpf_spi_write(struct spi_device *spi, const void *buf, size_t buf_size)
+static int mpf_spi_write(struct mpf_priv *priv, const void *buf, size_t buf_size)
{
- int status = mpf_poll_status(spi, 0);
+ int status = mpf_poll_status(priv, 0);
if (status < 0)
return status;
- return spi_write(spi, buf, buf_size);
+ return spi_write_then_read(priv->spi, buf, buf_size, NULL, 0);
}
-static int mpf_spi_write_then_read(struct spi_device *spi,
+static int mpf_spi_write_then_read(struct mpf_priv *priv,
const void *txbuf, size_t txbuf_size,
void *rxbuf, size_t rxbuf_size)
{
const u8 read_command[] = { MPF_SPI_READ_DATA };
int ret;
- ret = mpf_spi_write(spi, txbuf, txbuf_size);
+ ret = mpf_spi_write(priv, txbuf, txbuf_size);
if (ret)
return ret;
- ret = mpf_poll_status(spi, MPF_STATUS_READY);
+ ret = mpf_poll_status(priv, MPF_STATUS_READY);
if (ret < 0)
return ret;
- return spi_write_then_read(spi, read_command, sizeof(read_command),
+ return spi_write_then_read(priv->spi, read_command, sizeof(read_command),
rxbuf, rxbuf_size);
}
@@ -242,7 +253,6 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
const u8 isc_en_command[] = { MPF_SPI_ISC_ENABLE };
struct mpf_priv *priv = mgr->priv;
struct device *dev = &mgr->dev;
- struct spi_device *spi;
u32 isc_ret = 0;
int ret;
@@ -251,9 +261,7 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
return -EOPNOTSUPP;
}
- spi = priv->spi;
-
- ret = mpf_spi_write_then_read(spi, isc_en_command, sizeof(isc_en_command),
+ ret = mpf_spi_write_then_read(priv, isc_en_command, sizeof(isc_en_command),
&isc_ret, sizeof(isc_ret));
if (ret || isc_ret) {
dev_err(dev, "Failed to enable ISC: spi_ret %d, isc_ret %u\n",
@@ -261,7 +269,7 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
return -EFAULT;
}
- ret = mpf_spi_write(spi, program_mode, sizeof(program_mode));
+ ret = mpf_spi_write(priv, program_mode, sizeof(program_mode));
if (ret) {
dev_err(dev, "Failed to enter program mode: %d\n", ret);
return ret;
@@ -272,13 +280,32 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
return 0;
}
+static int mpf_spi_frame_write(struct mpf_priv *priv, const char *buf)
+{
+ struct spi_transfer xfers[2] = {
+ {
+ .tx_buf = &priv->tx,
+ .len = 1,
+ }, {
+ .tx_buf = buf,
+ .len = MPF_SPI_FRAME_SIZE,
+ },
+ };
+ int ret;
+
+ ret = mpf_poll_status(priv, 0);
+ if (ret < 0)
+ return ret;
+
+ priv->tx = MPF_SPI_FRAME;
+
+ return spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
+}
+
static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
{
- u8 spi_frame_command[] = { MPF_SPI_FRAME };
- struct spi_transfer xfers[2] = { 0 };
struct mpf_priv *priv = mgr->priv;
struct device *dev = &mgr->dev;
- struct spi_device *spi;
int ret, i;
if (count % MPF_SPI_FRAME_SIZE) {
@@ -287,19 +314,8 @@ static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count
return -EINVAL;
}
- spi = priv->spi;
-
- xfers[0].tx_buf = spi_frame_command;
- xfers[0].len = sizeof(spi_frame_command);
-
for (i = 0; i < count / MPF_SPI_FRAME_SIZE; i++) {
- xfers[1].tx_buf = buf + i * MPF_SPI_FRAME_SIZE;
- xfers[1].len = MPF_SPI_FRAME_SIZE;
-
- ret = mpf_poll_status(spi, 0);
- if (ret >= 0)
- ret = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers));
-
+ ret = mpf_spi_frame_write(priv, buf + i * MPF_SPI_FRAME_SIZE);
if (ret) {
dev_err(dev, "Failed to write bitstream frame %d/%zu\n",
i, count / MPF_SPI_FRAME_SIZE);
@@ -317,12 +333,9 @@ static int mpf_ops_write_complete(struct fpga_manager *mgr,
const u8 release_command[] = { MPF_SPI_RELEASE };
struct mpf_priv *priv = mgr->priv;
struct device *dev = &mgr->dev;
- struct spi_device *spi;
int ret;
- spi = priv->spi;
-
- ret = mpf_spi_write(spi, isc_dis_command, sizeof(isc_dis_command));
+ ret = mpf_spi_write(priv, isc_dis_command, sizeof(isc_dis_command));
if (ret) {
dev_err(dev, "Failed to disable ISC: %d\n", ret);
return ret;
@@ -330,7 +343,7 @@ static int mpf_ops_write_complete(struct fpga_manager *mgr,
usleep_range(1000, 2000);
- ret = mpf_spi_write(spi, release_command, sizeof(release_command));
+ ret = mpf_spi_write(priv, release_command, sizeof(release_command));
if (ret) {
dev_err(dev, "Failed to exit program mode: %d\n", ret);
return ret;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 09:25:12 +0100