[RESEND PATCH v2 0/5] Enable CAAM on i.MX7s fix TrustZone issues

[RESEND PATCH v2 0/5] Enable CAAM on i.MX7s fix TrustZone issues

[Bryan O'Donoghue]

V2-resend:
- Patch 0005 lost in the ether - resending

V2:
- Endian detection is ok with TrustZone enabled Horia.
  Endian detection logic tested with TrustZone enabled. The register that
  this relies on though isn't affected by the lock-down in the first page.
  Assuming set of affected registers is actually just the 'deco' registers
  though there is no formal statement of that, that I am aware of.

- Moving of TrustZone work-around into u-boot
  This set actually doesn't need to deal with TrustZone at all now but, for
  the sake of consistency keeping thread title

  https://patchwork.ozlabs.org/patch/866460/
  https://patchwork.ozlabs.org/patch/866462/
  https://patchwork.ozlabs.org/patch/865890/

- Reworded endless loop fix to read a bit better

- Fixes to DTS additions - Rui

- Fixes to number of clocks declared - Rui

V1:
This patch-set enables CAAM on the i.MX7s and fixes a number of issues
identified with the CAAM driver and hardware when TrustZone mode is
enabled.

The first block of patches are simple bug-fixes, followed by a second block
of patches which are simple enabling patches for the i.MX7Solo - note we
aren't enabling for the i.MX7Dual since we don't have hardware to test that
out but it should be a 1:1 mapping for others to enable when appropriate.

The final block in this series implements a fix for using the CAAM when
OPTEE/TrustZone is enabled. The various details are logged in these
threads.

Link: https://github.com/OP-TEE/optee_os/issues/1408
Link: https://tinyurl.com/yam5gv9a
Link: https://patchwork.ozlabs.org/cover/865042

In simple terms, when TrustZone is active the first page of the CAAM
becomes inaccessible to Linux as it has a special 'TZ bit' associated with
it that software cannot toggle or even view AFAIK.

The patches here then

1. Detect when TrustZone is active
2. Detect if u-boot (or OPTEE) has already initialized the RNG

and loads the CAAM driver in a different way - skipping over the RNG
initialization that Linux now no-longer has permissions to carry out.

Should #1 be true but #2 not be true, driver loading stops (and Rui's patch
for the NULL pointer dereference fixes a cash on this path). If #2 is true
but #1 is not then it's a NOP as Linux has full permission to rewrite the
deco registers in the first page of CAAM registers.

Finally then if #1 and #2 are true, the fixes here allow the CAAM to come
up and for the RNG to be useable again.

Bryan O'Donoghue (1):
  crypto: caam: Fix endless loop when RNG is already initialized

Rui Miguel Silva (4):
  crypto: caam: Fix null dereference at error path
  crypto: caam: do not use mem and emi_slow clock for imx7x
  clk: imx7d: add CAAM clock
  ARM: dts: imx7s: add CAAM device node

 arch/arm/boot/dts/imx7s.dtsi            | 31 +++++++++++++++++++++++
 drivers/clk/imx/clk-imx7d.c             |  1 +
 drivers/crypto/caam/ctrl.c              | 45 ++++++++++++++++++++-------------
 include/dt-bindings/clock/imx7d-clock.h |  3 ++-
 4 files changed, 61 insertions(+), 19 deletions(-)

-- 
2.7.4

[RESEND PATCH v2 1/5] crypto: caam: Fix null dereference at error path

[Bryan O'Donoghue]

From: Rui Miguel Silva <rui.silva@linaro.org>

caam_remove already removes the debugfs entry, so we need to remove the one
immediately before calling caam_remove.

This fix a NULL dereference at error paths is caam_probe fail.

[bod: changed name prefix to "crypto: caam: Fix .."]
[bod: added Fixes tag]

Fixes: 67c2315def06 ("crypto: caam - add Queue Interface (QI) backend
support")

Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Cc: <stable@vger.kernel.org> # 4.12+
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
---
 drivers/crypto/caam/ctrl.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 027e121..98986d3 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -809,9 +809,6 @@ static int caam_probe(struct platform_device *pdev)
 	return 0;
 
 caam_remove:
-#ifdef CONFIG_DEBUG_FS
-	debugfs_remove_recursive(ctrlpriv->dfs_root);
-#endif
 	caam_remove(pdev);
 	return ret;
 
-- 
2.7.4

[RESEND PATCH v2 2/5] crypto: caam: Fix endless loop when RNG is already initialized

[Bryan O'Donoghue]

commit 1005bccd7a4a ("crypto: caam - enable instantiation of all RNG4 state
handles") introduces a control when incrementing ent_delay which contains
the following comment above it:

/*
 * If either SH were instantiated by somebody else
 * (e.g. u-boot) then it is assumed that the entropy
 * parameters are properly set and thus the function
 * setting these (kick_trng(...)) is skipped.
 * Also, if a handle was instantiated, do not change
 * the TRNG parameters.
 */

This is a problem observed when sec_init() has been run in u-boot and
and TrustZone is enabled. We can fix this by instantiating all rng state
handles in u-boot but, on the Kernel side we should ensure that this
non-terminating path is dealt with.

Fixes: 1005bccd7a4a ("crypto: caam - enable instantiation of all RNG4 state
handles")

Reported-by: Ryan Harkin <ryan.harkin@linaro.org>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Cc: <stable@vger.kernel.org> # 4.12+
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
---
 drivers/crypto/caam/ctrl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 98986d3..0a1e96b 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -704,7 +704,10 @@ static int caam_probe(struct platform_device *pdev)
 					 ent_delay);
 				kick_trng(pdev, ent_delay);
 				ent_delay += 400;
+			} else if (ctrlpriv->rng4_sh_init && inst_handles) {
+				ent_delay += 400;
 			}
+
 			/*
 			 * if instantiate_rng(...) fails, the loop will rerun
 			 * and the kick_trng(...) function will modfiy the
-- 
2.7.4

[RESEND PATCH v2 3/5] crypto: caam: do not use mem and emi_slow clock for imx7x

[Bryan O'Donoghue]

From: Rui Miguel Silva <rui.silva@linaro.org>

I.MX7x only use two clocks for the CAAM module, so make sure we do not try to
use the mem and the emi_slow clock when running in that imx7d and imx7s machine
type.

[bod: fixed minor trailing whitespace issue]

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
---
 drivers/crypto/caam/ctrl.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 0a1e96b..1f2dd6a 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -333,7 +333,8 @@ static int caam_remove(struct platform_device *pdev)
 
 	/* shut clocks off before finalizing shutdown */
 	clk_disable_unprepare(ctrlpriv->caam_ipg);
-	clk_disable_unprepare(ctrlpriv->caam_mem);
+	if (ctrlpriv->caam_mem)
+		clk_disable_unprepare(ctrlpriv->caam_mem);
 	clk_disable_unprepare(ctrlpriv->caam_aclk);
 	if (ctrlpriv->caam_emi_slow)
 		clk_disable_unprepare(ctrlpriv->caam_emi_slow);
@@ -462,14 +463,17 @@ static int caam_probe(struct platform_device *pdev)
 	}
 	ctrlpriv->caam_ipg = clk;
 
-	clk = caam_drv_identify_clk(&pdev->dev, "mem");
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		dev_err(&pdev->dev,
-			"can't identify CAAM mem clk: %d\n", ret);
-		return ret;
+	if (!of_machine_is_compatible("fsl,imx7d") &&
+	    !of_machine_is_compatible("fsl,imx7s")) {
+		clk = caam_drv_identify_clk(&pdev->dev, "mem");
+		if (IS_ERR(clk)) {
+			ret = PTR_ERR(clk);
+			dev_err(&pdev->dev,
+				"can't identify CAAM mem clk: %d\n", ret);
+			return ret;
+		}
+		ctrlpriv->caam_mem = clk;
 	}
-	ctrlpriv->caam_mem = clk;
 
 	clk = caam_drv_identify_clk(&pdev->dev, "aclk");
 	if (IS_ERR(clk)) {
@@ -480,7 +484,9 @@ static int caam_probe(struct platform_device *pdev)
 	}
 	ctrlpriv->caam_aclk = clk;
 
-	if (!of_machine_is_compatible("fsl,imx6ul")) {
+	if (!of_machine_is_compatible("fsl,imx6ul") &&
+	    !of_machine_is_compatible("fsl,imx7d") &&
+	    !of_machine_is_compatible("fsl,imx7s")) {
 		clk = caam_drv_identify_clk(&pdev->dev, "emi_slow");
 		if (IS_ERR(clk)) {
 			ret = PTR_ERR(clk);
@@ -497,11 +503,13 @@ static int caam_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = clk_prepare_enable(ctrlpriv->caam_mem);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
-			ret);
-		goto disable_caam_ipg;
+	if (ctrlpriv->caam_mem) {
+		ret = clk_prepare_enable(ctrlpriv->caam_mem);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
+				ret);
+			goto disable_caam_ipg;
+		}
 	}
 
 	ret = clk_prepare_enable(ctrlpriv->caam_aclk);
@@ -823,7 +831,8 @@ static int caam_probe(struct platform_device *pdev)
 disable_caam_aclk:
 	clk_disable_unprepare(ctrlpriv->caam_aclk);
 disable_caam_mem:
-	clk_disable_unprepare(ctrlpriv->caam_mem);
+	if (ctrlpriv->caam_mem)
+		clk_disable_unprepare(ctrlpriv->caam_mem);
 disable_caam_ipg:
 	clk_disable_unprepare(ctrlpriv->caam_ipg);
 	return ret;
-- 
2.7.4

[RESEND PATCH v2 4/5] clk: imx7d: add CAAM clock

[Bryan O'Donoghue]

From: Rui Miguel Silva <rui.silva@linaro.org>

Add CAAM clock so that we could use the Cryptographic Acceleration and
Assurance Module (CAAM) hardware block.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
---
 drivers/clk/imx/clk-imx7d.c             | 1 +
 include/dt-bindings/clock/imx7d-clock.h | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c
index 80dc211..52ab096 100644
--- a/drivers/clk/imx/clk-imx7d.c
+++ b/drivers/clk/imx/clk-imx7d.c
@@ -795,6 +795,7 @@ static void __init imx7d_clocks_init(struct device_node *ccm_node)
 	clks[IMX7D_DRAM_PHYM_ALT_ROOT_CLK] = imx_clk_gate4("dram_phym_alt_root_clk", "dram_phym_alt_post_div", base + 0x4130, 0);
 	clks[IMX7D_DRAM_ALT_ROOT_CLK] = imx_clk_gate4("dram_alt_root_clk", "dram_alt_post_div", base + 0x4130, 0);
 	clks[IMX7D_OCOTP_CLK] = imx_clk_gate4("ocotp_clk", "ipg_root_clk", base + 0x4230, 0);
+	clks[IMX7D_CAAM_CLK] = imx_clk_gate4("caam_clk", "ipg_root_clk", base + 0x4240, 0);
 	clks[IMX7D_USB_HSIC_ROOT_CLK] = imx_clk_gate4("usb_hsic_root_clk", "usb_hsic_post_div", base + 0x4420, 0);
 	clks[IMX7D_SDMA_CORE_CLK] = imx_clk_gate4("sdma_root_clk", "ahb_root_clk", base + 0x4480, 0);
 	clks[IMX7D_PCIE_CTRL_ROOT_CLK] = imx_clk_gate4("pcie_ctrl_root_clk", "pcie_ctrl_post_div", base + 0x4600, 0);
diff --git a/include/dt-bindings/clock/imx7d-clock.h b/include/dt-bindings/clock/imx7d-clock.h
index e2f99ae..2bc5618 100644
--- a/include/dt-bindings/clock/imx7d-clock.h
+++ b/include/dt-bindings/clock/imx7d-clock.h
@@ -452,5 +452,6 @@
 #define IMX7D_OCOTP_CLK			439
 #define IMX7D_NAND_RAWNAND_CLK		440
 #define IMX7D_NAND_USDHC_BUS_RAWNAND_CLK 441
-#define IMX7D_CLK_END			442
+#define IMX7D_CAAM_CLK			442
+#define IMX7D_CLK_END			443
 #endif /* __DT_BINDINGS_CLOCK_IMX7D_H */
-- 
2.7.4

[RESEND PATCH v2 5/5] ARM: dts: imx7s: add CAAM device node

[Bryan O'Donoghue]

From: Rui Miguel Silva <rui.silva@linaro.org>

Add CAAM device node to the i.MX7s device tree.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
---
 arch/arm/boot/dts/imx7s.dtsi | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi
index 82ad26e..e38c159 100644
--- a/arch/arm/boot/dts/imx7s.dtsi
+++ b/arch/arm/boot/dts/imx7s.dtsi
@@ -805,6 +805,37 @@
 				status = "disabled";
 			};
 
+			crypto: caam@30900000 {
+				compatible = "fsl,sec-v4.0";
+				fsl,sec-era = <4>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				reg = <0x30900000 0x40000>;
+				ranges = <0 0x30900000 0x40000>;
+				interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&clks IMX7D_CAAM_CLK>,
+					 <&clks IMX7D_AHB_CHANNEL_ROOT_CLK>;
+				clock-names = "ipg", "aclk";
+
+				sec_jr0: jr0@1000 {
+					compatible = "fsl,sec-v4.0-job-ring";
+					reg = <0x1000 0x1000>;
+					interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				sec_jr1: jr1@2000 {
+					compatible = "fsl,sec-v4.0-job-ring";
+					reg = <0x2000 0x1000>;
+					interrupts = <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				sec_jr2: jr1@3000 {
+					compatible = "fsl,sec-v4.0-job-ring";
+					reg = <0x3000 0x1000>;
+					interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH>;
+				};
+			};
+
 			flexcan1: can@30a00000 {
 				compatible = "fsl,imx7d-flexcan", "fsl,imx6q-flexcan";
 				reg = <0x30a00000 0x10000>;
-- 
2.7.4

Re: [RESEND PATCH v2 0/5] Enable CAAM on i.MX7s fix TrustZone issues

[Fabio Estevam]

Hi Bryan,

On Fri, Jan 26, 2018 at 5:04 PM, Bryan O'Donoghue
<pure.logic@nexus-software.ie> wrote:

> Bryan O'Donoghue (1):
>   crypto: caam: Fix endless loop when RNG is already initialized
>
> Rui Miguel Silva (4):
>   crypto: caam: Fix null dereference at error path
>   crypto: caam: do not use mem and emi_slow clock for imx7x

Thanks for your series!

>   clk: imx7d: add CAAM clock

This one should be posted to the clock driver maintainers.

>   ARM: dts: imx7s: add CAAM device node

This one should be posted to the i.MX arch maintainers.