Adds mmc_rpmb_route_frames() to route RPMB data frames from/to an
external entity.
Tested-by: Igor Opaniuk <igor.opan...@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklan...@linaro.org>
---
drivers/mmc/rpmb.c | 160 +++++++++++++++++++++++++++++++++++++++++++++
include/mmc.h | 2 +
2 files changed, 162 insertions(+)
diff --git a/drivers/mmc/rpmb.c b/drivers/mmc/rpmb.c
index dfbdb0deb107..908f19208955 100644
--- a/drivers/mmc/rpmb.c
+++ b/drivers/mmc/rpmb.c
@@ -321,3 +321,163 @@ int mmc_rpmb_write(struct mmc *mmc, void *addr, unsigned
short blk,
}
return i;
}
+
+static int send_write_mult_block(struct mmc *mmc, const struct s_rpmb *frm,
+ unsigned short cnt)
+{
+ struct mmc_cmd cmd = {
+ .cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK,
+ .resp_type = MMC_RSP_R1b,
+ };
+ struct mmc_data data = {
+ .src = (const void *)frm,
+ .blocks = cnt,
+ .blocksize = sizeof(*frm),
+ .flags = MMC_DATA_WRITE,
+ };
+
+ return mmc_send_cmd(mmc, &cmd, &data);
+}
+
+static int send_read_mult_block(struct mmc *mmc, struct s_rpmb *frm,
+ unsigned short cnt)
+{
+ struct mmc_cmd cmd = {
+ .cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK,
+ .resp_type = MMC_RSP_R1,
+ };
+ struct mmc_data data = {
+ .dest = (void *)frm,
+ .blocks = cnt,
+ .blocksize = sizeof(*frm),
+ .flags = MMC_DATA_READ,
+ };
+
+ return mmc_send_cmd(mmc, &cmd, &data);
+}
+
+static int rpmb_route_write_req(struct mmc *mmc, struct s_rpmb *req,
+ unsigned short req_cnt, struct s_rpmb *rsp,
+ unsigned short rsp_cnt)
+{
+ int ret;
+
+ /*
+ * Send the write request.
+ */
+ ret = mmc_set_blockcount(mmc, req_cnt, true);
+ if (ret)
+ return ret;
+
+ ret = send_write_mult_block(mmc, req, req_cnt);
+ if (ret)
+ return ret;
+
+ /*
+ * Read the result of the request.
+ */
+ ret = mmc_set_blockcount(mmc, 1, false);
+ if (ret)
+ return ret;
+
+ memset(rsp, 0, sizeof(*rsp));
+ rsp->request = cpu_to_be16(RPMB_REQ_STATUS);
+ ret = send_write_mult_block(mmc, rsp, 1);
+ if (ret)
+ return ret;
+
+ ret = mmc_set_blockcount(mmc, 1, false);
+ if (ret)
+ return ret;
+
+ return send_read_mult_block(mmc, rsp, 1);
+}
+
+static int rpmb_route_read_req(struct mmc *mmc, struct s_rpmb *req,
+ unsigned short req_cnt, struct s_rpmb *rsp,
+ unsigned short rsp_cnt)
+{
+ int ret;
+
+ /*
+ * Send the read request.
+ */
+ ret = mmc_set_blockcount(mmc, 1, false);
+ if (ret)
+ return ret;
+
+ ret = send_write_mult_block(mmc, req, 1);
+ if (ret)
+ return ret;
+
+ /*
+ * Read the result of the request.
+ */
+
+ ret = mmc_set_blockcount(mmc, rsp_cnt, false);
+ if (ret)
+ return ret;
+
+ return send_read_mult_block(mmc, rsp, rsp_cnt);
+}
+
+static int rpmb_route_frames(struct mmc *mmc, struct s_rpmb *req,
+ unsigned short req_cnt, struct s_rpmb *rsp,
+ unsigned short rsp_cnt)
+{
+ unsigned short n;
+
+ /*
+ * If multiple request frames are provided, make sure that all are
+ * of the same type.
+ */
+ for (n = 1; n < req_cnt; n++)
+ if (req[n].request != req->request)
+ return -EINVAL;
+
+ switch (be16_to_cpu(req->request)) {
+ case RPMB_REQ_KEY:
+ if (req_cnt != 1 || rsp_cnt != 1)
+ return -EINVAL;
+ return rpmb_route_write_req(mmc, req, req_cnt, rsp, rsp_cnt);
+
+ case RPMB_REQ_WRITE_DATA:
+ if (!req_cnt || rsp_cnt != 1)
+ return -EINVAL;
+ return rpmb_route_write_req(mmc, req, req_cnt, rsp, rsp_cnt);
+
+ case RPMB_REQ_WCOUNTER:
+ if (req_cnt != 1 || rsp_cnt != 1)
+ return -EINVAL;
+ return rpmb_route_read_req(mmc, req, req_cnt, rsp, rsp_cnt);
+
+ case RPMB_REQ_READ_DATA:
+ if (req_cnt != 1 || !req_cnt)
+ return -EINVAL;
+ return rpmb_route_read_req(mmc, req, req_cnt, rsp, rsp_cnt);
+
+ default:
+ debug("Unsupported message type: %d\n",
+ be16_to_cpu(req->request));
+ return -EINVAL;
+ }
+}
+
+int mmc_rpmb_route_frames(struct mmc *mmc, void *req, unsigned long reqlen,
+ void *rsp, unsigned long rsplen)
+{
+ /*
+ * Whoever crafted the data supplied to this function knows how to
+ * format the PRMB frames and which response is expected. If
+ * there's some unexpected mismatch it's more helpful to report an
+ * error immediately than trying to guess what was the intention
+ * and possibly just delay an eventual error which will be harder
+ * to track down.
+ */
+
+ if (reqlen % sizeof(struct s_rpmb) || rsplen % sizeof(struct s_rpmb))
+ return -EINVAL;
+
+ return rpmb_route_frames(mmc, req, reqlen / sizeof(struct s_rpmb),
+ rsp, rsplen / sizeof(struct s_rpmb));
+}
diff --git a/include/mmc.h b/include/mmc.h
index df4255b828a7..d6e02af4edea 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -748,6 +748,8 @@ int mmc_rpmb_read(struct mmc *mmc, void *addr, unsigned
short blk,
unsigned short cnt, unsigned char *key);
int mmc_rpmb_write(struct mmc *mmc, void *addr, unsigned short blk,
unsigned short cnt, unsigned char *key);
+int mmc_rpmb_route_frames(struct mmc *mmc, void *req, unsigned long reqlen,
+ void *rsp, unsigned long rsplen);
#ifdef CONFIG_CMD_BKOPS_ENABLE
int mmc_set_bkops_enable(struct mmc *mmc);
#endif
--
2.17.1
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