[PATCH v5 0/8] soc/tegra: fuse: Add ACPI support

[PATCH v5 0/8] soc/tegra: fuse: Add ACPI support

[Kartik]

This series of patches add ACPI support for Tegra194 and Tegra234 in
Tegra fuse and apbmisc drivers. It also adds support for Tegra241
which uses ACPI boot.

Kartik (8):
  mm/util: Introduce kmemdup_array()
  soc/tegra: fuse: Use dev_err_probe for probe failures
  soc/tegra: fuse: Refactor resource mapping
  soc/tegra: fuse: Add tegra_acpi_init_apbmisc()
  soc/tegra: fuse: Add function to add lookups
  soc/tegra: fuse: Add function to print SKU info
  soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234
  soc/tegra: fuse: Add support for Tegra241

 drivers/soc/tegra/Kconfig              |   5 ++
 drivers/soc/tegra/fuse/fuse-tegra.c    | 114 ++++++++++++++++++-------
 drivers/soc/tegra/fuse/fuse-tegra30.c  |  20 +++++
 drivers/soc/tegra/fuse/fuse.h          |   5 ++
 drivers/soc/tegra/fuse/tegra-apbmisc.c | 110 ++++++++++++++++++++----
 include/linux/string.h                 |   1 +
 include/soc/tegra/fuse.h               |   1 +
 mm/util.c                              |  17 ++++
 8 files changed, 228 insertions(+), 45 deletions(-)

---
v3 -> v4:
	* Added following patch to introduce kmemdup_array:
	  "mm/util: Introduce kmemdup_array() to duplicate an array"
	* Add "soc/tegra: fuse: Use dev_err_probe for probe failures".
v2 -> v3:
	* Minor changes in following patches:
	  soc/tegra: fuse: Add tegra_acpi_init_apbmisc()
	  soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234

v1 -> v2:
	* Used '--patience' while formatting patches.
	* Added "soc/tegra: fuse: Refactor resource mapping" to share
	  the common code between tegra_init_apbmisc() and
	  tegra_acpi_init_apbmisc() functions.
	* Dropped "soc/tegra: fuse: Add function to register nvmem"
	  as ACPI and device-tree boot are sharing the same probe.
	  So, no need to refactor the code here.
---
-- 
2.34.1

[PATCH v5 1/8] mm/util: Introduce kmemdup_array()

[Kartik]

Introduce kmemdup_array() API to duplicate `n` number of elements
from a given array. This internally uses kmemdup to allocate and duplicate
the `src` array.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v4 -> v5:
	* Simplify the implementation by just returning kmemdup(size_mul).
---
 include/linux/string.h |  1 +
 mm/util.c              | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/linux/string.h b/include/linux/string.h
index 3c920b6d609b..fcfa1062c79b 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -180,6 +180,7 @@ extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
 extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
 extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
 extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp);
+extern void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp);
 
 extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
 extern void argv_free(char **argv);
diff --git a/mm/util.c b/mm/util.c
index 6eddd891198e..8801446140d6 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -135,6 +135,23 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp)
 }
 EXPORT_SYMBOL(kmemdup);
 
+/**
+ * kmemdup_array - duplicate a given array.
+ *
+ * @src: array to duplicate.
+ * @element_size: size of each element of array.
+ * @count: number of elements to duplicate from array.
+ * @gfp: GFP mask to use.
+ *
+ * Return: duplicated array of @src or %NULL in case of error,
+ * result is physically contiguous. Use kfree() to free.
+ */
+void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp)
+{
+	return kmemdup(src, size_mul(element_size, count), gfp);
+}
+EXPORT_SYMBOL(kmemdup_array);
+
 /**
  * kvmemdup - duplicate region of memory
  *
-- 
2.34.1

[PATCH v5 2/8] soc/tegra: fuse: Use dev_err_probe for probe failures

[Kartik]

Currently, in tegra_fuse_probe() if clock/reset get fails, then the
driver prints an error if the error is not caused by -EPROBE_DEFER.
This can be improved by using dev_err_probe() instead.

So, return dev_err_probe() if clock/reset get fails.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index a2c28f493a75..98805885158e 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -131,13 +131,8 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 	fuse->phys = res->start;
 
 	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
-	if (IS_ERR(fuse->clk)) {
-		if (PTR_ERR(fuse->clk) != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
-				PTR_ERR(fuse->clk));
-
-		return PTR_ERR(fuse->clk);
-	}
+	if (IS_ERR(fuse->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->clk), "failed to get FUSE clock\n");
 
 	platform_set_drvdata(pdev, fuse);
 	fuse->dev = &pdev->dev;
@@ -179,12 +174,8 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 	}
 
 	fuse->rst = devm_reset_control_get_optional(&pdev->dev, "fuse");
-	if (IS_ERR(fuse->rst)) {
-		err = PTR_ERR(fuse->rst);
-		dev_err(&pdev->dev, "failed to get FUSE reset: %pe\n",
-			fuse->rst);
-		return err;
-	}
+	if (IS_ERR(fuse->rst))
+		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->rst), "failed to get FUSE reset\n");
 
 	/*
 	 * FUSE clock is enabled at a boot time, hence this resume/suspend
-- 
2.34.1

[PATCH v5 3/8] soc/tegra: fuse: Refactor resource mapping

[Kartik]

To prepare for adding ACPI support to the tegra-apbmisc driver,
relocate the code responsible for mapping memory resources from
the function ‘tegra_init_apbmisc’ to the function
‘tegra_init_apbmisc_resources.’ This adjustment will allow the
code to be shared between ‘tegra_init_apbmisc’ and the upcoming
‘tegra_acpi_init_apbmisc’ function.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
 drivers/soc/tegra/fuse/tegra-apbmisc.c | 37 +++++++++++++++-----------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index da970f3dbf35..06c1b3a2c7ec 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -160,9 +160,28 @@ void __init tegra_init_revision(void)
 	tegra_sku_info.platform = tegra_get_platform();
 }
 
-void __init tegra_init_apbmisc(void)
+static void tegra_init_apbmisc_resources(struct resource *apbmisc,
+					 struct resource *straps)
 {
 	void __iomem *strapping_base;
+
+	apbmisc_base = ioremap(apbmisc->start, resource_size(apbmisc));
+	if (apbmisc_base)
+		chipid = readl_relaxed(apbmisc_base + 4);
+	else
+		pr_err("failed to map APBMISC registers\n");
+
+	strapping_base = ioremap(straps->start, resource_size(straps));
+	if (strapping_base) {
+		strapping = readl_relaxed(strapping_base);
+		iounmap(strapping_base);
+	} else {
+		pr_err("failed to map strapping options registers\n");
+	}
+}
+
+void __init tegra_init_apbmisc(void)
+{
 	struct resource apbmisc, straps;
 	struct device_node *np;
 
@@ -219,21 +238,7 @@ void __init tegra_init_apbmisc(void)
 		}
 	}
 
-	apbmisc_base = ioremap(apbmisc.start, resource_size(&apbmisc));
-	if (!apbmisc_base) {
-		pr_err("failed to map APBMISC registers\n");
-	} else {
-		chipid = readl_relaxed(apbmisc_base + 4);
-	}
-
-	strapping_base = ioremap(straps.start, resource_size(&straps));
-	if (!strapping_base) {
-		pr_err("failed to map strapping options registers\n");
-	} else {
-		strapping = readl_relaxed(strapping_base);
-		iounmap(strapping_base);
-	}
-
+	tegra_init_apbmisc_resources(&apbmisc, &straps);
 	long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
 
 put:
-- 
2.34.1

[PATCH v5 4/8] soc/tegra: fuse: Add tegra_acpi_init_apbmisc()

[Kartik]

In preparation to ACPI support in Tegra fuse driver add function
tegra_acpi_init_apbmisc() to initialize tegra-apbmisc driver.
Also, document the reason of calling tegra_init_apbmisc() at early init.

Note that function tegra_acpi_init_apbmisc() is not placed in the __init
section, because it will be called during probe.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v2 -> v3:
	* Fix build warnings seen when CONFIG_ACPI is disabled by moving
	  tegra_init_apbmisc table inside #ifdef CONFIG_ACPI block.

v1 -> v2:
	* Update ACPI ID table 'tegra_init_apbmisc'.
	* Add comment to document the reason to call tegra_init_apbmisc
	  at early init.
	* Fix an issue where acpi_dev_free_resource_list() and
	* acpi_dev_put() were not called if
	  acpi_dev_get_memory_resources() returned 1.
	* Update logic to fetch memory resources in
	  tegra_acpi_init_apbmisc().
	* Fix build errors seen when CONFIG_ACPI is disabled.
---
 drivers/soc/tegra/fuse/fuse.h          |  1 +
 drivers/soc/tegra/fuse/tegra-apbmisc.c | 72 ++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h
index 90f23be73894..a41e9f85281a 100644
--- a/drivers/soc/tegra/fuse/fuse.h
+++ b/drivers/soc/tegra/fuse/fuse.h
@@ -69,6 +69,7 @@ struct tegra_fuse {
 
 void tegra_init_revision(void);
 void tegra_init_apbmisc(void);
+void tegra_acpi_init_apbmisc(void);
 
 u32 __init tegra_fuse_read_spare(unsigned int spare);
 u32 __init tegra_fuse_read_early(unsigned int offset);
diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index 06c1b3a2c7ec..e2ca93de6c1f 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -3,9 +3,11 @@
  * Copyright (c) 2014-2023, NVIDIA CORPORATION.  All rights reserved.
  */
 
+#include <linux/acpi.h>
 #include <linux/export.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 
@@ -180,6 +182,12 @@ static void tegra_init_apbmisc_resources(struct resource *apbmisc,
 	}
 }
 
+/**
+ * tegra_init_apbmisc - Initializes Tegra APBMISC and Strapping registers.
+ *
+ * This is called during early init as some of the old 32-bit ARM code needs
+ * information from the APBMISC registers very early during boot.
+ */
 void __init tegra_init_apbmisc(void)
 {
 	struct resource apbmisc, straps;
@@ -244,3 +252,67 @@ void __init tegra_init_apbmisc(void)
 put:
 	of_node_put(np);
 }
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id apbmisc_acpi_match[] = {
+	{ "NVDA2010" },
+	{ /* sentinel */ }
+};
+
+void tegra_acpi_init_apbmisc(void)
+{
+	struct resource *resources[2] = { NULL };
+	struct resource_entry *rentry, *tmp;
+	struct acpi_device *adev = NULL;
+	struct list_head resource_list;
+	int rcount = 0;
+	int ret;
+
+	adev = acpi_dev_get_first_match_dev(apbmisc_acpi_match[0].id, NULL, -1);
+	if (!adev)
+		return;
+
+	INIT_LIST_HEAD(&resource_list);
+
+	ret = acpi_dev_get_memory_resources(adev, &resource_list);
+	if (ret < 0) {
+		pr_err("failed to get APBMISC memory resources");
+		goto out_put_acpi_dev;
+	}
+
+	/*
+	 * Get required memory resources.
+	 *
+	 * resources[0]: apbmisc.
+	 * resources[1]: straps.
+	 */
+	resource_list_for_each_entry_safe(rentry, tmp, &resource_list) {
+		if (rcount >= ARRAY_SIZE(resources))
+			break;
+
+		resources[rcount++] = rentry->res;
+	}
+
+	if (!resources[0]) {
+		pr_err("failed to get APBMISC registers\n");
+		goto out_free_resource_list;
+	}
+
+	if (!resources[1]) {
+		pr_err("failed to get strapping options registers\n");
+		goto out_free_resource_list;
+	}
+
+	tegra_init_apbmisc_resources(resources[0], resources[1]);
+
+out_free_resource_list:
+	acpi_dev_free_resource_list(&resource_list);
+
+out_put_acpi_dev:
+	acpi_dev_put(adev);
+}
+#else
+void tegra_acpi_init_apbmisc(void)
+{
+}
+#endif
-- 
2.34.1

[PATCH v5 5/8] soc/tegra: fuse: Add function to add lookups

[Kartik]

Add helper function tegra_fuse_add_lookups() to register Tegra fuse
nvmem lookups. So, this can be shared between tegra_fuse_init() and
ACPI probe, which is to be introduced later.

Use kmemdup_array to duplicate fuse->soc->lookups.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v3 -> v4:
	* Use kmemdup_array to duplicate fuse->soc->lookups.
	* Return err at the end of tegra_fuse_probe to remove
	  redundant code.
v1 -> v2:
	* Use size_mul to calculate lookups array size.
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index 98805885158e..c91194612a9a 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -113,6 +113,18 @@ static void tegra_fuse_restore(void *base)
 	fuse->clk = NULL;
 }
 
+static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
+{
+	fuse->lookups = kmemdup_array(fuse->soc->lookups, sizeof(*fuse->lookups),
+				      fuse->soc->num_lookups, GFP_KERNEL);
+	if (!fuse->lookups)
+		return -ENOMEM;
+
+	nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
+
+	return 0;
+}
+
 static int tegra_fuse_probe(struct platform_device *pdev)
 {
 	void __iomem *base = fuse->base;
@@ -398,6 +410,7 @@ static int __init tegra_init_fuse(void)
 	const struct of_device_id *match;
 	struct device_node *np;
 	struct resource regs;
+	int err;
 
 	tegra_init_apbmisc();
 
@@ -495,15 +508,11 @@ static int __init tegra_init_fuse(void)
 	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
 		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
 
-	if (fuse->soc->lookups) {
-		size_t size = sizeof(*fuse->lookups) * fuse->soc->num_lookups;
+	err = tegra_fuse_add_lookups(fuse);
+	if (err)
+		pr_err("failed to add FUSE lookups\n");
 
-		fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
-		if (fuse->lookups)
-			nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
-	}
-
-	return 0;
+	return err;
 }
 early_initcall(tegra_init_fuse);
 
-- 
2.34.1

[PATCH v5 6/8] soc/tegra: fuse: Add function to print SKU info

[Kartik]

Add helper function tegra_fuse_print_sku_info() to print Tegra SKU
information. So, it can be shared between tegra_fuse_init() and
ACPI probe which is to be introduced later.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v1 -> v2:
	* Renamed tegra_fuse_pr_sku_info() as
	  tegra_fuse_print_sku_info().
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index c91194612a9a..9bab758a60f2 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -113,6 +113,16 @@ static void tegra_fuse_restore(void *base)
 	fuse->clk = NULL;
 }
 
+static void tegra_fuse_print_sku_info(struct tegra_sku_info *tegra_sku_info)
+{
+	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
+		tegra_revision_name[tegra_sku_info->revision],
+		tegra_sku_info->sku_id, tegra_sku_info->cpu_process_id,
+		tegra_sku_info->soc_process_id);
+	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
+		tegra_sku_info->cpu_speedo_id, tegra_sku_info->soc_speedo_id);
+}
+
 static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
 {
 	fuse->lookups = kmemdup_array(fuse->soc->lookups, sizeof(*fuse->lookups),
@@ -501,12 +511,7 @@ static int __init tegra_init_fuse(void)
 
 	fuse->soc->init(fuse);
 
-	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
-		tegra_revision_name[tegra_sku_info.revision],
-		tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id,
-		tegra_sku_info.soc_process_id);
-	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
-		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
+	tegra_fuse_print_sku_info(&tegra_sku_info);
 
 	err = tegra_fuse_add_lookups(fuse);
 	if (err)
-- 
2.34.1

[PATCH v5 7/8] soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234

[Kartik]

Add ACPI support for Tegra194 & Tegra243 SoC's. This requires
following modifications to the probe when ACPI boot is used:
 - Initialize soc data.
 - Add nvmem lookups.
 - Register soc device.
 - use devm_clk_get_optional() instead of devm_clk_get() to get
   fuse->clk, as fuse clocks are not required when using ACPI boot.

Also, drop '__init' keyword for tegra_soc_device_register() as this is also
used by tegra_fuse_probe() and use dev_err_probe() wherever applicable.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v4 -> v5:
	* Fix build warnings seen with tegra_fuse_acpi_match when
	  CONFIG_ACPI is disabled.
v3 -> v4:
	* Use dev_fwnode() to dereference the fwnode.
	* Add MODULE_DEVICE_TABLE for tegra_fuse_acpi_match.
	* Moved tegra_fuse_acpi_match above tegra_fuse_driver i.e.,
	  close to the user of tegra_fuse_acpi_match.
	* Moved the improvements made to fuse clk/rst get error handling
	  to separate patch.
	* Moved ACPI related initialization after fuse->base is
	  initialized in tegra_fuse_probe(), as this triggers a warning
	  in tegra_fuse_read_early() which is called from
	  fuse->soc->init().
v2 -> v3:
	* Updated commit message to specify changes related to inclusion
	  of dev_err_probe().

v1 -> v2:
	* Updated ACPI ID table 'tegra_fuse_acpi_match'.
	* Removed ',' after "{ /* sentinel */ }" in
	  'tegra_fuse_acpi_match'.
	* Using same probe for ACPI and device-tree boot.
	* Added code for required initialization when ACPI boot is used.
	* Make clocks optional for ACPI.
	* Use dev_err_probe() wherever applicable.
	* Check if clock has been initialized only when device-tree
	  boot is used.
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 50 +++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index 9bab758a60f2..daf39f0e6d93 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -3,11 +3,13 @@
  * Copyright (c) 2013-2023, NVIDIA CORPORATION.  All rights reserved.
  */
 
+#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/kobject.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/mod_devicetable.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/nvmem-provider.h>
 #include <linux/of.h>
@@ -152,6 +154,37 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 		return PTR_ERR(fuse->base);
 	fuse->phys = res->start;
 
+	/* Initialize the soc data and lookups if using ACPI boot. */
+	if (is_acpi_node(dev_fwnode(&pdev->dev)) && !fuse->soc) {
+		u8 chip;
+
+		tegra_acpi_init_apbmisc();
+
+		chip = tegra_get_chip_id();
+		switch (chip) {
+#if defined(CONFIG_ARCH_TEGRA_194_SOC)
+		case TEGRA194:
+			fuse->soc = &tegra194_fuse_soc;
+			break;
+#endif
+#if defined(CONFIG_ARCH_TEGRA_234_SOC)
+		case TEGRA234:
+			fuse->soc = &tegra234_fuse_soc;
+			break;
+#endif
+		default:
+			return dev_err_probe(&pdev->dev, -EINVAL, "Unsupported SoC: %02x\n", chip);
+		}
+
+		fuse->soc->init(fuse);
+		tegra_fuse_print_sku_info(&tegra_sku_info);
+		tegra_soc_device_register();
+
+		err = tegra_fuse_add_lookups(fuse);
+		if (err)
+			return dev_err_probe(&pdev->dev, err, "failed to add FUSE lookups\n");
+	}
+
 	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
 	if (IS_ERR(fuse->clk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(fuse->clk), "failed to get FUSE clock\n");
@@ -275,10 +308,17 @@ static const struct dev_pm_ops tegra_fuse_pm = {
 	SET_SYSTEM_SLEEP_PM_OPS(tegra_fuse_suspend, tegra_fuse_resume)
 };
 
+static const struct acpi_device_id __maybe_unused tegra_fuse_acpi_match[] = {
+	{ "NVDA200F" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(acpi, tegra_fuse_acpi_match);
+
 static struct platform_driver tegra_fuse_driver = {
 	.driver = {
 		.name = "tegra-fuse",
 		.of_match_table = tegra_fuse_match,
+		.acpi_match_table = ACPI_PTR(tegra_fuse_acpi_match),
 		.pm = &tegra_fuse_pm,
 		.suppress_bind_attrs = true,
 	},
@@ -300,7 +340,13 @@ u32 __init tegra_fuse_read_early(unsigned int offset)
 
 int tegra_fuse_readl(unsigned long offset, u32 *value)
 {
-	if (!fuse->read || !fuse->clk)
+	/*
+	 * Wait for fuse->clk to be initialized if device-tree boot is used.
+	 */
+	if (is_of_node(dev_fwnode(fuse->dev)) && !fuse->clk)
+		return -EPROBE_DEFER;
+
+	if (!fuse->read)
 		return -EPROBE_DEFER;
 
 	if (IS_ERR(fuse->clk))
@@ -383,7 +429,7 @@ const struct attribute_group tegra194_soc_attr_group = {
 };
 #endif
 
-struct device * __init tegra_soc_device_register(void)
+struct device *tegra_soc_device_register(void)
 {
 	struct soc_device_attribute *attr;
 	struct soc_device *dev;
-- 
2.34.1

[PATCH v5 8/8] soc/tegra: fuse: Add support for Tegra241

[Kartik]

Add support for Tegra241 which use ACPI boot.

Signed-off-by: Kartik <kkartik@nvidia.com>
---
v1 -> v2:
	* Removed few entries from tegra241_fuse_soc which were
	  initilized as NULL or 0.
---
 drivers/soc/tegra/Kconfig              |  5 +++++
 drivers/soc/tegra/fuse/fuse-tegra.c    |  5 +++++
 drivers/soc/tegra/fuse/fuse-tegra30.c  | 20 ++++++++++++++++++++
 drivers/soc/tegra/fuse/fuse.h          |  4 ++++
 drivers/soc/tegra/fuse/tegra-apbmisc.c |  1 +
 include/soc/tegra/fuse.h               |  1 +
 6 files changed, 36 insertions(+)

diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
index f16beeabaa92..33512558af9f 100644
--- a/drivers/soc/tegra/Kconfig
+++ b/drivers/soc/tegra/Kconfig
@@ -133,6 +133,11 @@ config ARCH_TEGRA_234_SOC
 	help
 	  Enable support for the NVIDIA Tegra234 SoC.
 
+config ARCH_TEGRA_241_SOC
+	bool "NVIDIA Tegra241 SoC"
+	help
+	  Enable support for the NVIDIA Tegra241 SoC.
+
 endif
 endif
 
diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index daf39f0e6d93..eac95946c425 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -171,6 +171,11 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 		case TEGRA234:
 			fuse->soc = &tegra234_fuse_soc;
 			break;
+#endif
+#if defined(CONFIG_ARCH_TEGRA_241_SOC)
+		case TEGRA241:
+			fuse->soc = &tegra241_fuse_soc;
+			break;
 #endif
 		default:
 			return dev_err_probe(&pdev->dev, -EINVAL, "Unsupported SoC: %02x\n", chip);
diff --git a/drivers/soc/tegra/fuse/fuse-tegra30.c b/drivers/soc/tegra/fuse/fuse-tegra30.c
index e94d46372a63..2070d36c510d 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra30.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra30.c
@@ -678,3 +678,23 @@ const struct tegra_fuse_soc tegra234_fuse_soc = {
 	.clk_suspend_on = false,
 };
 #endif
+
+#if defined(CONFIG_ARCH_TEGRA_241_SOC)
+static const struct tegra_fuse_info tegra241_fuse_info = {
+	.read = tegra30_fuse_read,
+	.size = 0x16008,
+	.spare = 0xcf0,
+};
+
+static const struct nvmem_keepout tegra241_fuse_keepouts[] = {
+	{ .start = 0xc, .end = 0x1600c }
+};
+
+const struct tegra_fuse_soc tegra241_fuse_soc = {
+	.init = tegra30_fuse_init,
+	.info = &tegra241_fuse_info,
+	.keepouts = tegra241_fuse_keepouts,
+	.num_keepouts = ARRAY_SIZE(tegra241_fuse_keepouts),
+	.soc_attr_group = &tegra194_soc_attr_group,
+};
+#endif
diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h
index a41e9f85281a..f3b705327c20 100644
--- a/drivers/soc/tegra/fuse/fuse.h
+++ b/drivers/soc/tegra/fuse/fuse.h
@@ -136,4 +136,8 @@ extern const struct tegra_fuse_soc tegra194_fuse_soc;
 extern const struct tegra_fuse_soc tegra234_fuse_soc;
 #endif
 
+#ifdef CONFIG_ARCH_TEGRA_241_SOC
+extern const struct tegra_fuse_soc tegra241_fuse_soc;
+#endif
+
 #endif
diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index e2ca93de6c1f..c72bdb3e4e2c 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -64,6 +64,7 @@ bool tegra_is_silicon(void)
 	switch (tegra_get_chip_id()) {
 	case TEGRA194:
 	case TEGRA234:
+	case TEGRA241:
 	case TEGRA264:
 		if (tegra_get_platform() == 0)
 			return true;
diff --git a/include/soc/tegra/fuse.h b/include/soc/tegra/fuse.h
index 3a513be50243..8f421b9f7585 100644
--- a/include/soc/tegra/fuse.h
+++ b/include/soc/tegra/fuse.h
@@ -17,6 +17,7 @@
 #define TEGRA186	0x18
 #define TEGRA194	0x19
 #define TEGRA234	0x23
+#define TEGRA241	0x24
 #define TEGRA264	0x26
 
 #define TEGRA_FUSE_SKU_CALIB_0	0xf0
-- 
2.34.1

Re: [PATCH v5 4/8] soc/tegra: fuse: Add tegra_acpi_init_apbmisc()

[Christophe JAILLET]

Le 16/10/2023 à 07:34, Kartik a écrit :
> In preparation to ACPI support in Tegra fuse driver add function
> tegra_acpi_init_apbmisc() to initialize tegra-apbmisc driver.
> Also, document the reason of calling tegra_init_apbmisc() at early init.
> 
> Note that function tegra_acpi_init_apbmisc() is not placed in the __init
> section, because it will be called during probe.
> 
> Signed-off-by: Kartik <kkartik-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
> v2 -> v3:
> 	* Fix build warnings seen when CONFIG_ACPI is disabled by moving
> 	  tegra_init_apbmisc table inside #ifdef CONFIG_ACPI block.
> 
> v1 -> v2:
> 	* Update ACPI ID table 'tegra_init_apbmisc'.
> 	* Add comment to document the reason to call tegra_init_apbmisc
> 	  at early init.
> 	* Fix an issue where acpi_dev_free_resource_list() and
> 	* acpi_dev_put() were not called if
> 	  acpi_dev_get_memory_resources() returned 1.
> 	* Update logic to fetch memory resources in
> 	  tegra_acpi_init_apbmisc().
> 	* Fix build errors seen when CONFIG_ACPI is disabled.
> ---
>   drivers/soc/tegra/fuse/fuse.h          |  1 +
>   drivers/soc/tegra/fuse/tegra-apbmisc.c | 72 ++++++++++++++++++++++++++
>   2 files changed, 73 insertions(+)
> 
> diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h
> index 90f23be73894..a41e9f85281a 100644
> --- a/drivers/soc/tegra/fuse/fuse.h
> +++ b/drivers/soc/tegra/fuse/fuse.h
> @@ -69,6 +69,7 @@ struct tegra_fuse {
>   
>   void tegra_init_revision(void);
>   void tegra_init_apbmisc(void);
> +void tegra_acpi_init_apbmisc(void);
>   
>   u32 __init tegra_fuse_read_spare(unsigned int spare);
>   u32 __init tegra_fuse_read_early(unsigned int offset);
> diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
> index 06c1b3a2c7ec..e2ca93de6c1f 100644
> --- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
> +++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
> @@ -3,9 +3,11 @@
>    * Copyright (c) 2014-2023, NVIDIA CORPORATION.  All rights reserved.
>    */
>   
> +#include <linux/acpi.h>
>   #include <linux/export.h>
>   #include <linux/io.h>
>   #include <linux/kernel.h>
> +#include <linux/mod_devicetable.h>
>   #include <linux/of.h>
>   #include <linux/of_address.h>
>   
> @@ -180,6 +182,12 @@ static void tegra_init_apbmisc_resources(struct resource *apbmisc,
>   	}
>   }
>   
> +/**
> + * tegra_init_apbmisc - Initializes Tegra APBMISC and Strapping registers.
> + *
> + * This is called during early init as some of the old 32-bit ARM code needs
> + * information from the APBMISC registers very early during boot.
> + */
>   void __init tegra_init_apbmisc(void)
>   {
>   	struct resource apbmisc, straps;
> @@ -244,3 +252,67 @@ void __init tegra_init_apbmisc(void)
>   put:
>   	of_node_put(np);
>   }
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id apbmisc_acpi_match[] = {
> +	{ "NVDA2010" },
> +	{ /* sentinel */ }
> +};
> +
> +void tegra_acpi_init_apbmisc(void)
> +{
> +	struct resource *resources[2] = { NULL };
> +	struct resource_entry *rentry, *tmp;
> +	struct acpi_device *adev = NULL;
> +	struct list_head resource_list;
> +	int rcount = 0;
> +	int ret;
> +
> +	adev = acpi_dev_get_first_match_dev(apbmisc_acpi_match[0].id, NULL, -1);
> +	if (!adev)
> +		return;
> +
> +	INIT_LIST_HEAD(&resource_list);
> +
> +	ret = acpi_dev_get_memory_resources(adev, &resource_list);
> +	if (ret < 0) {
> +		pr_err("failed to get APBMISC memory resources");
> +		goto out_put_acpi_dev;
> +	}
> +
> +	/*
> +	 * Get required memory resources.
> +	 *
> +	 * resources[0]: apbmisc.
> +	 * resources[1]: straps.
> +	 */
> +	resource_list_for_each_entry_safe(rentry, tmp, &resource_list) {

Nit: Is the 'safe' version really needed here?

CJ

> +		if (rcount >= ARRAY_SIZE(resources))
> +			break;
> +
> +		resources[rcount++] = rentry->res;
> +	}
> +
> +	if (!resources[0]) {
> +		pr_err("failed to get APBMISC registers\n");
> +		goto out_free_resource_list;
> +	}
> +
> +	if (!resources[1]) {
> +		pr_err("failed to get strapping options registers\n");
> +		goto out_free_resource_list;
> +	}
> +
> +	tegra_init_apbmisc_resources(resources[0], resources[1]);
> +
> +out_free_resource_list:
> +	acpi_dev_free_resource_list(&resource_list);
> +
> +out_put_acpi_dev:
> +	acpi_dev_put(adev);
> +}
> +#else
> +void tegra_acpi_init_apbmisc(void)
> +{
> +}
> +#endif

Re: [PATCH v5 4/8] soc/tegra: fuse: Add tegra_acpi_init_apbmisc()

[Kartik]

On Mon, 2023-10-16 at 07:41 +0200, Christophe JAILLET wrote:
> > +	/*
> > +	 * Get required memory resources.
> > +	 *
> > +	 * resources[0]: apbmisc.
> > +	 * resources[1]: straps.
> > +	 */
> > +	resource_list_for_each_entry_safe(rentry, tmp, &resource_list) {
> 
> Nit: Is the 'safe' version really needed here?
> 
> CJ

No, it seems like the safe version is not required. We do not expect any
modifications to resource_list here.

I've updated this in v6.

Thanks and Regards,
Kartik

Re: [PATCH v5 1/8] mm/util: Introduce kmemdup_array()

[Kees Cook]

On Mon, Oct 16, 2023 at 11:04:04AM +0530, Kartik wrote:
> Introduce kmemdup_array() API to duplicate `n` number of elements
> from a given array. This internally uses kmemdup to allocate and duplicate
> the `src` array.
> 
> Signed-off-by: Kartik <kkartik@nvidia.com>

Acked-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook