| Message ID | 20231016053411.3380-5-kkartik@nvidia.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | soc/tegra: fuse: Add ACPI support | expand |
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
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
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
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(+)