linux-kernel - [PATCH v3 2/2] crypto: caam

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Date:   Wed,  5 Apr 2023 11:07:52 +0200
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 v3 2/2] crypto: caam - OP-TEE firmware support

From: Horia GeantA <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 GeantA <horia.geanta@....com>
Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@....com>
---
 drivers/crypto/caam/ctrl.c    | 23 ++++++++++++++++++++++-
 drivers/crypto/caam/debugfs.c |  3 +++
 drivers/crypto/caam/intern.h  |  1 +
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index de1f0acdb712..9c5a035e1b96 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.
@@ -800,6 +816,7 @@ static int caam_probe(struct platform_device *pdev)
 			      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 +859,9 @@ static int caam_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	if (!reg_access)
+		goto report_live;
+
 	comp_params = rd_reg32(&perfmon->comp_parms_ls);
 	ctrlpriv->blob_present = !!(comp_params & CTPR_LS_BLOB);
 
@@ -944,6 +964,7 @@ static int caam_probe(struct platform_device *pdev)
 		clrsetbits_32(&ctrl->scfgr, 0, SCFGR_RDBENABLE);
 	}
 
+report_live:
 	/* NOTE: RTIC detection ought to go here, around Si time */
 
 	caam_id = (u64)rd_reg32(&perfmon->caam_id_ms) << 32 |
diff --git a/drivers/crypto/caam/debugfs.c b/drivers/crypto/caam/debugfs.c
index b2ef2273298d..6358d3cabf57 100644
--- a/drivers/crypto/caam/debugfs.c
+++ b/drivers/crypto/caam/debugfs.c
@@ -77,6 +77,9 @@ 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..86ed1b91c22d 100644
--- a/drivers/crypto/caam/intern.h
+++ b/drivers/crypto/caam/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