[PATCHv4 2/3] fpga: altera-cvp: Preparation for V2 parts.

thor.thayer
2019-07-31T16:40:22Z

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>
---
v2 Remove inline function declaration
Reverse Christmas Tree format for local variables
v3 Add return code check in altera_cvp_chk_error()
v4 Use min() function to determine block length
---
drivers/fpga/altera-cvp.c | 69 +++++++++++++++++++++++++++++------------------
1 file 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);

--
2.7.4