summaryrefslogtreecommitdiff
path: root/drivers/fpga
diff options
context:
space:
mode:
authorThor Thayer <thor.thayer@linux.intel.com>2019-08-19 23:48:07 +0300
committerMoritz Fischer <mdf@kernel.org>2019-08-24 21:38:27 +0300
commitd2083d040a95b923a217377dd51c27d57eecf5e6 (patch)
tree4639d928110ba2bd1ed0a3fbe1fdb2470080134e /drivers/fpga
parenteb12511f0d47b4da58cc9fc1e93362081fa3331b (diff)
downloadlinux-d2083d040a95b923a217377dd51c27d57eecf5e6.tar.xz
fpga: altera-cvp: Preparation for V2 parts.
In preparation for adding newer V2 parts that use a FIFO, reorganize altera_cvp_chk_error() and change the write function to block based. V2 parts have a block size matching the FIFO while older V1 parts write a 32 bit word at a time. Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com> Signed-off-by: Moritz Fischer <mdf@kernel.org>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/altera-cvp.c69
1 files changed, 43 insertions, 26 deletions
diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c
index 9df2073331cb..3b8386fd32e7 100644
--- a/drivers/fpga/altera-cvp.c
+++ b/drivers/fpga/altera-cvp.c
@@ -143,6 +143,42 @@ static int altera_cvp_wait_status(struct altera_cvp_conf *conf, u32 status_mask,
return -ETIMEDOUT;
}
+static int altera_cvp_chk_error(struct fpga_manager *mgr, size_t bytes)
+{
+ struct altera_cvp_conf *conf = mgr->priv;
+ u32 val;
+ int ret;
+
+ /* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */
+ ret = altera_read_config_dword(conf, VSE_CVP_STATUS, &val);
+ if (ret || (val & VSE_CVP_STATUS_CFG_ERR)) {
+ dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n",
+ bytes);
+ return -EPROTO;
+ }
+ return 0;
+}
+
+static int altera_cvp_send_block(struct altera_cvp_conf *conf,
+ const u32 *data, size_t len)
+{
+ u32 mask, words = len / sizeof(u32);
+ int i, remainder;
+
+ for (i = 0; i < words; i++)
+ conf->write_data(conf, *data++);
+
+ /* write up to 3 trailing bytes, if any */
+ remainder = len % sizeof(u32);
+ if (remainder) {
+ mask = BIT(remainder * 8) - 1;
+ if (mask)
+ conf->write_data(conf, *data & mask);
+ }
+
+ return 0;
+}
+
static int altera_cvp_teardown(struct fpga_manager *mgr,
struct fpga_image_info *info)
{
@@ -265,39 +301,25 @@ static int altera_cvp_write_init(struct fpga_manager *mgr,
return 0;
}
-static inline int altera_cvp_chk_error(struct fpga_manager *mgr, size_t bytes)
-{
- struct altera_cvp_conf *conf = mgr->priv;
- u32 val;
-
- /* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */
- altera_read_config_dword(conf, VSE_CVP_STATUS, &val);
- if (val & VSE_CVP_STATUS_CFG_ERR) {
- dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n",
- bytes);
- return -EPROTO;
- }
- return 0;
-}
-
static int altera_cvp_write(struct fpga_manager *mgr, const char *buf,
size_t count)
{
struct altera_cvp_conf *conf = mgr->priv;
+ size_t done, remaining, len;
const u32 *data;
- size_t done, remaining;
int status = 0;
- u32 mask;
/* STEP 9 - write 32-bit data from RBF file to CVP data register */
data = (u32 *)buf;
remaining = count;
done = 0;
- while (remaining >= 4) {
- conf->write_data(conf, *data++);
- done += 4;
- remaining -= 4;
+ while (remaining) {
+ len = min(sizeof(u32), remaining);
+ altera_cvp_send_block(conf, data, len);
+ data++;
+ done += len;
+ remaining -= len;
/*
* STEP 10 (optional) and STEP 11
@@ -315,11 +337,6 @@ static int altera_cvp_write(struct fpga_manager *mgr, const char *buf,
}
}
- /* write up to 3 trailing bytes, if any */
- mask = BIT(remaining * 8) - 1;
- if (mask)
- conf->write_data(conf, *data & mask);
-
if (altera_cvp_chkcfg)
status = altera_cvp_chk_error(mgr, count);