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Message-Id: <20230302062055.1564514-3-meenakshi.aggarwal@nxp.com>
Date: Thu, 2 Mar 2023 11:50:55 +0530
From: meenakshi.aggarwal@....com
To: horia.geanta@....com, V.sethi@....com, pankaj.gupta@....com,
gaurav.jain@....com, herbert@...dor.apana.org.au,
davem@...emloft.net, linux-crypto@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Meenakshi Aggarwal <meenakshi.aggarwal@....com>
Subject: [PATCH 2/2] crypto: caam - OP-TEE firmware support
From: Horia Geantă <horia.geanta@....com>
caam driver needs to be aware of OP-TEE f/w presence, since some things
are done differently:
1. there is no access to controller's register page (note however that
some registers are aliased in job rings' register pages)
2 Due to this, MCFGR[PS] cannot be read and driver assumes
MCFGR[PS] = b'0 - engine using 32-bit address pointers.
This is in sync with the fact that:
-all i.MX SoCs currently use MCFGR[PS] = b'0
-only i.MX OP-TEE use cases don't allow access to controller register page
Signed-off-by: Horia Geantă <horia.geanta@....com>
Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@....com>
---
drivers/crypto/caam/ctrl.c | 24 ++++++++++++++++++++++--
drivers/crypto/caam/debugfs.c | 3 +++
drivers/crypto/caam/intern.h | 3 ++-
3 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index be9724d05d01..5a6cd63742a4 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -633,6 +633,7 @@ static int caam_probe(struct platform_device *pdev)
int pg_size;
int BLOCK_OFFSET = 0;
bool pr_support = false;
+ bool reg_access = true;
ctrlpriv = devm_kzalloc(&pdev->dev, sizeof(*ctrlpriv), GFP_KERNEL);
if (!ctrlpriv)
@@ -646,6 +647,17 @@ static int caam_probe(struct platform_device *pdev)
caam_imx = (bool)imx_soc_match;
if (imx_soc_match) {
+ /*
+ * Until Layerscape and i.MX OP-TEE get in sync,
+ * only i.MX OP-TEE use cases disallow access to
+ * caam page 0 (controller) registers.
+ */
+ np = of_find_compatible_node(NULL, NULL, "linaro,optee-tz");
+ ctrlpriv->optee_en = !!np;
+ of_node_put(np);
+
+ reg_access = ctrlpriv->optee_en;
+
if (!imx_soc_match->data) {
dev_err(dev, "No clock data provided for i.MX SoC");
return -EINVAL;
@@ -696,7 +708,8 @@ static int caam_probe(struct platform_device *pdev)
caam_little_end = !(bool)(rd_reg32(&perfmon->status) &
(CSTA_PLEND | CSTA_ALT_PLEND));
comp_params = rd_reg32(&perfmon->comp_parms_ms);
- if (comp_params & CTPR_MS_PS && rd_reg32(&ctrl->mcr) & MCFGR_LONG_PTR)
+ if (reg_access && comp_params & CTPR_MS_PS &&
+ rd_reg32(&ctrl->mcr) & MCFGR_LONG_PTR)
caam_ptr_sz = sizeof(u64);
else
caam_ptr_sz = sizeof(u32);
@@ -761,6 +774,9 @@ static int caam_probe(struct platform_device *pdev)
}
#endif
+ if (!reg_access)
+ goto set_dma_mask;
+
/*
* Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
* long pointers in master configuration register.
@@ -799,7 +815,7 @@ static int caam_probe(struct platform_device *pdev)
clrsetbits_32(&ctrl->jrstart, 0, JRSTART_JR0_START |
JRSTART_JR1_START | JRSTART_JR2_START |
JRSTART_JR3_START);
-
+set_dma_mask:
ret = dma_set_mask_and_coherent(dev, caam_get_dma_mask(dev));
if (ret) {
dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
@@ -842,6 +858,9 @@ static int caam_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ if (!reg_access)
+ goto report_live;
+
comp_params = rd_reg32(&ctrl->perfmon.comp_parms_ls);
ctrlpriv->blob_present = !!(comp_params & CTPR_LS_BLOB);
@@ -945,6 +964,7 @@ static int caam_probe(struct platform_device *pdev)
/* NOTE: RTIC detection ought to go here, around Si time */
+report_live:
caam_id = (u64)rd_reg32(&perfmon->caam_id_ms) << 32 |
(u64)rd_reg32(&perfmon->caam_id_ls);
diff --git a/drivers/crypto/caam/debugfs.c b/drivers/crypto/caam/debugfs.c
index 73fe8530c0d6..42081224f568 100644
--- a/drivers/crypto/caam/debugfs.c
+++ b/drivers/crypto/caam/debugfs.c
@@ -76,6 +76,9 @@ void caam_debugfs_init(struct caam_drv_private *ctrlpriv,
debugfs_create_file("fault_status", 0444, ctrlpriv->ctl,
&perfmon->status, &caam_fops_u32_ro);
+ if (ctrlpriv->optee_en)
+ return;
+
/* Internal covering keys (useful in non-secure mode only) */
ctrlpriv->ctl_kek_wrap.data = (__force void *)&ctrlpriv->ctrl->kek[0];
ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h
index 572cf66c887a..efe2bc2f1103 100644
--- a/drivers/crypto/caam/intern.h
+++ b/drivers/crypto/caam/intern.h
@@ -4,7 +4,7 @@
* Private/internal definitions between modules
*
* Copyright 2008-2011 Freescale Semiconductor, Inc.
- * Copyright 2019 NXP
+ * Copyright 2019, 2023 NXP
*/
#ifndef INTERN_H
@@ -94,6 +94,7 @@ struct caam_drv_private {
u8 qi_present; /* Nonzero if QI present in device */
u8 blob_present; /* Nonzero if BLOB support present in device */
u8 mc_en; /* Nonzero if MC f/w is active */
+ u8 optee_en; /* Nonzero if OP-TEE f/w is active */
int secvio_irq; /* Security violation interrupt number */
int virt_en; /* Virtualization enabled in CAAM */
int era; /* CAAM Era (internal HW revision) */
--
2.25.1
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