From 02c1c37f66b15cf54cabf71b1e51b0658996c10f Mon Sep 17 00:00:00 2001 From: Nicolas Ferre Date: Mon, 19 Aug 2019 17:12:19 +0200 Subject: [PATCH 1/4] ARM: at91: Documentation: update the sama5d3 and armv7m datasheets Update SAMA5D3 and SAM E70/S70/V70/V71 Family SoC Datasheets. URL are updated in Microchip documentation. Signed-off-by: Nicolas Ferre Link: https://lore.kernel.org/r/20190819151219.19727-1-nicolas.ferre@microchip.com Signed-off-by: Alexandre Belloni --- Documentation/arm/microchip.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Documentation/arm/microchip.rst b/Documentation/arm/microchip.rst index c9a44c98e868..1adf53dfc494 100644 --- a/Documentation/arm/microchip.rst +++ b/Documentation/arm/microchip.rst @@ -103,7 +103,7 @@ the Microchip website: http://www.microchip.com. * Datasheet - http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet.pdf + http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet_B.pdf * ARM Cortex-A5 + NEON based SoCs - sama5d4 family @@ -167,7 +167,7 @@ the Microchip website: http://www.microchip.com. * Datasheet - http://ww1.microchip.com/downloads/en/DeviceDoc/60001527A.pdf + http://ww1.microchip.com/downloads/en/DeviceDoc/SAM-E70-S70-V70-V71-Family-Data-Sheet-DS60001527D.pdf Linux kernel information From dbbf98392af6e2cf3673908c1388ca1ae915c8bb Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Fri, 6 Sep 2019 15:06:41 +0000 Subject: [PATCH 2/4] memory: atmel-ebi: move NUM_CS definition inside EBI driver The total number of EBI CS lines is described by the EBI controller and not by the Matrix. Move the definition for the number of CS inside EBI driver. Signed-off-by: Tudor Ambarus Link: https://lore.kernel.org/r/20190906150632.19039-1-tudor.ambarus@microchip.com Signed-off-by: Alexandre Belloni --- drivers/memory/atmel-ebi.c | 6 ++++-- include/linux/mfd/syscon/atmel-matrix.h | 1 - 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c index 0322df9dc249..8515196c2b03 100644 --- a/drivers/memory/atmel-ebi.c +++ b/drivers/memory/atmel-ebi.c @@ -19,6 +19,8 @@ #include #include +#define AT91_EBI_NUM_CS 8 + struct atmel_ebi_dev_config { int cs; struct atmel_smc_cs_conf smcconf; @@ -314,7 +316,7 @@ static int atmel_ebi_dev_setup(struct atmel_ebi *ebi, struct device_node *np, if (ret) return ret; - if (cs >= AT91_MATRIX_EBI_NUM_CS || + if (cs >= AT91_EBI_NUM_CS || !(ebi->caps->available_cs & BIT(cs))) { dev_err(dev, "invalid reg property in %pOF\n", np); return -EINVAL; @@ -344,7 +346,7 @@ static int atmel_ebi_dev_setup(struct atmel_ebi *ebi, struct device_node *np, apply = true; i = 0; - for_each_set_bit(cs, &cslines, AT91_MATRIX_EBI_NUM_CS) { + for_each_set_bit(cs, &cslines, AT91_EBI_NUM_CS) { ebid->configs[i].cs = cs; if (apply) { diff --git a/include/linux/mfd/syscon/atmel-matrix.h b/include/linux/mfd/syscon/atmel-matrix.h index f61cd127a852..20c25665216a 100644 --- a/include/linux/mfd/syscon/atmel-matrix.h +++ b/include/linux/mfd/syscon/atmel-matrix.h @@ -106,7 +106,6 @@ #define AT91_MATRIX_DDR_IOSR BIT(18) #define AT91_MATRIX_NFD0_SELECT BIT(24) #define AT91_MATRIX_DDR_MP_EN BIT(25) -#define AT91_MATRIX_EBI_NUM_CS 8 #define AT91_MATRIX_USBPUCR_PUON BIT(30) From 5db3fb404af55df9d0a26bd3314bc6cd3fe9f5d6 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Fri, 6 Sep 2019 15:15:28 +0000 Subject: [PATCH 3/4] memory: atmel-ebi: switch to SPDX license identifiers Adopt the SPDX license identifiers to ease license compliance management. Signed-off-by: Tudor Ambarus Link: https://lore.kernel.org/r/20190906151519.19442-1-tudor.ambarus@microchip.com Signed-off-by: Alexandre Belloni --- drivers/memory/atmel-ebi.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c index 8515196c2b03..14386d0b5f57 100644 --- a/drivers/memory/atmel-ebi.c +++ b/drivers/memory/atmel-ebi.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* * EBI driver for Atmel chips * inspired by the fsl weim bus driver * * Copyright (C) 2013 Jean-Jacques Hiblot - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. */ #include From c3277f8ee8cdadf011b8390dfdb4c44ecfaa1a7a Mon Sep 17 00:00:00 2001 From: Kamel Bouhara Date: Fri, 4 Oct 2019 17:18:02 +0200 Subject: [PATCH 4/4] soc: at91: Add Atmel SFR SN (Serial Number) support Add support to read SFR's read-only registers providing the SoC Serial Numbers (SN0+SN1) to userspace. ~ # hexdump -n 8 -e'"%d\n"' /sys/bus/nvmem/devices/atmel-sfr0/nvmem 959527243 371539274 Signed-off-by: Kamel Bouhara Tested-by: Tudor Ambarus Reviewed-by: Tudor Ambarus Link: https://lore.kernel.org/r/20191004151802.21793-1-kamel.bouhara@bootlin.com Signed-off-by: Alexandre Belloni --- drivers/soc/atmel/Kconfig | 11 +++++ drivers/soc/atmel/Makefile | 1 + drivers/soc/atmel/sfr.c | 99 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 111 insertions(+) create mode 100644 drivers/soc/atmel/sfr.c diff --git a/drivers/soc/atmel/Kconfig b/drivers/soc/atmel/Kconfig index 05528139b023..50caf6db9c0e 100644 --- a/drivers/soc/atmel/Kconfig +++ b/drivers/soc/atmel/Kconfig @@ -5,3 +5,14 @@ config AT91_SOC_ID default ARCH_AT91 help Include support for the SoC bus on the Atmel ARM SoCs. + +config AT91_SOC_SFR + tristate "Special Function Registers support" + depends on ARCH_AT91 || COMPILE_TEST + help + This is a driver for the Special Function Registers available on + Atmel SAMA5Dx SoCs, providing access to specific aspects of the + integrated memory, bridge implementations, processor etc. + + This driver can also be built as a module. If so, the module + will be called sfr. diff --git a/drivers/soc/atmel/Makefile b/drivers/soc/atmel/Makefile index 7ca355d10553..d849a897cd77 100644 --- a/drivers/soc/atmel/Makefile +++ b/drivers/soc/atmel/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_AT91_SOC_ID) += soc.o +obj-$(CONFIG_AT91_SOC_SFR) += sfr.o diff --git a/drivers/soc/atmel/sfr.c b/drivers/soc/atmel/sfr.c new file mode 100644 index 000000000000..0525eef49d1a --- /dev/null +++ b/drivers/soc/atmel/sfr.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sfr.c - driver for special function registers + * + * Copyright (C) 2019 Bootlin. + * + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#define SFR_SN0 0x4c +#define SFR_SN_SIZE 8 + +struct atmel_sfr_priv { + struct regmap *regmap; +}; + +static int atmel_sfr_read(void *context, unsigned int offset, + void *buf, size_t bytes) +{ + struct atmel_sfr_priv *priv = context; + + return regmap_bulk_read(priv->regmap, SFR_SN0 + offset, + buf, bytes / 4); +} + +static struct nvmem_config atmel_sfr_nvmem_config = { + .name = "atmel-sfr", + .read_only = true, + .word_size = 4, + .stride = 4, + .size = SFR_SN_SIZE, + .reg_read = atmel_sfr_read, +}; + +static int atmel_sfr_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct nvmem_device *nvmem; + struct atmel_sfr_priv *priv; + u8 sn[SFR_SN_SIZE]; + int ret; + + priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->regmap = syscon_node_to_regmap(np); + if (IS_ERR(priv->regmap)) { + dev_err(dev, "cannot get parent's regmap\n"); + return PTR_ERR(priv->regmap); + } + + atmel_sfr_nvmem_config.dev = dev; + atmel_sfr_nvmem_config.priv = priv; + + nvmem = devm_nvmem_register(dev, &atmel_sfr_nvmem_config); + if (IS_ERR(nvmem)) { + dev_err(dev, "error registering nvmem config\n"); + return PTR_ERR(nvmem); + } + + ret = atmel_sfr_read(priv, 0, sn, SFR_SN_SIZE); + if (ret == 0) + add_device_randomness(sn, SFR_SN_SIZE); + + return ret; +} + +static const struct of_device_id atmel_sfr_dt_ids[] = { + { + .compatible = "atmel,sama5d2-sfr", + }, { + .compatible = "atmel,sama5d4-sfr", + }, { + /* sentinel */ + }, +}; +MODULE_DEVICE_TABLE(of, atmel_sfr_dt_ids); + +static struct platform_driver atmel_sfr_driver = { + .probe = atmel_sfr_probe, + .driver = { + .name = "atmel-sfr", + .of_match_table = atmel_sfr_dt_ids, + }, +}; +module_platform_driver(atmel_sfr_driver); + +MODULE_AUTHOR("Kamel Bouhara "); +MODULE_DESCRIPTION("Atmel SFR SN driver for SAMA5D2/4 SoC family"); +MODULE_LICENSE("GPL v2");