On Fri, Jun 23, 2023 at 07:48:03PM +0530, Komal Bajaj wrote: > For some of the Qualcomm SoC's, it is possible that > some of the fuse regions or entire qfprom region is > protected from non-secure access. In such situations, > linux will have to use secure calls to read the region. Linux > With that motivation, add secure qfprom driver. Ensuring > the address to read is word aligned since our secure I/O > only supports word size I/O. What do you mean with this last sentence? I don't see anything in your patch demanding this. Perhaps just drop this sentence? > > Signed-off-by: Komal Bajaj <quic_kbajaj@xxxxxxxxxxx> > --- > drivers/nvmem/Kconfig | 12 ++++ > drivers/nvmem/Makefile | 2 + > drivers/nvmem/sec-qfprom.c | 116 +++++++++++++++++++++++++++++++++++++ > 3 files changed, 130 insertions(+) > create mode 100644 drivers/nvmem/sec-qfprom.c > > diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig > index b291b27048c7..2b0dd73d899e 100644 > --- a/drivers/nvmem/Kconfig > +++ b/drivers/nvmem/Kconfig > @@ -216,6 +216,18 @@ config NVMEM_QCOM_QFPROM > This driver can also be built as a module. If so, the module > will be called nvmem_qfprom. > > +config NVMEM_QCOM_SEC_QFPROM > + tristate "QCOM SECURE QFPROM Support" > + depends on ARCH_QCOM || COMPILE_TEST > + depends on HAS_IOMEM > + select QCOM_SCM > + help > + Say y here to enable secure QFPROM support. The secure QFPROM provides access > + functions for QFPROM data to rest of the drivers via nvmem interface. > + > + This driver can also be built as a module. If so, the module will be called > + nvmem_sec_qfprom. > + > config NVMEM_RAVE_SP_EEPROM > tristate "Rave SP EEPROM Support" > depends on RAVE_SP_CORE > diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile > index f82431ec8aef..4b4bf5880488 100644 > --- a/drivers/nvmem/Makefile > +++ b/drivers/nvmem/Makefile > @@ -44,6 +44,8 @@ obj-$(CONFIG_NVMEM_NINTENDO_OTP) += nvmem-nintendo-otp.o > nvmem-nintendo-otp-y := nintendo-otp.o > obj-$(CONFIG_NVMEM_QCOM_QFPROM) += nvmem_qfprom.o > nvmem_qfprom-y := qfprom.o > +obj-$(CONFIG_NVMEM_QCOM_SEC_QFPROM) += nvmem_sec_qfprom.o > +nvmem_sec_qfprom-y := sec-qfprom.o > obj-$(CONFIG_NVMEM_RAVE_SP_EEPROM) += nvmem-rave-sp-eeprom.o > nvmem-rave-sp-eeprom-y := rave-sp-eeprom.o > obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o > diff --git a/drivers/nvmem/sec-qfprom.c b/drivers/nvmem/sec-qfprom.c > new file mode 100644 > index 000000000000..47b2c71593dd > --- /dev/null > +++ b/drivers/nvmem/sec-qfprom.c > @@ -0,0 +1,116 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved. > + */ > + > +#include <linux/clk.h> Please review your include list, this and a few others doesn't seem to be used. > +#include <linux/device.h> > +#include <linux/firmware/qcom/qcom_scm.h> > +#include <linux/io.h> > +#include <linux/iopoll.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/mod_devicetable.h> > +#include <linux/nvmem-provider.h> > +#include <linux/platform_device.h> > +#include <linux/pm_domain.h> > +#include <linux/pm_runtime.h> > +#include <linux/property.h> > +#include <linux/regulator/consumer.h> > + > + > +/** > + * struct sec_sec_qfprom_priv - structure holding secure qfprom attributes > + * > + * @qfpseccorrected: iomapped memory space for secure qfprom corrected address space. > + * @dev: qfprom device structure. > + */ > +struct sec_qfprom_priv { There no risk of confusion here, so please drop the "_priv" suffix. > + phys_addr_t qfpseccorrected; Same thing here, so "base" or "addr" would suffice. > + struct device *dev; > +}; > + > +static int sec_qfprom_reg_read(void *context, unsigned int reg, void *_val, size_t bytes) > +{ > + struct sec_qfprom_priv *priv = context; > + u8 *val = _val; > + u8 *tmp; > + u32 read_val; > + unsigned int i; > + > + for (i = 0; i < bytes; i++, reg++) { > + if (i == 0 || reg % 4 == 0) { > + if (qcom_scm_io_readl(priv->qfpseccorrected + (reg & ~3), &read_val)) { > + dev_err(priv->dev, "Couldn't access fuse register\n"); > + return -EINVAL; > + } > + tmp = (u8 *)&read_val; > + } > + > + val[i] = tmp[reg & 3]; > + } > + > + return 0; > +} > + > +static void sec_qfprom_runtime_disable(void *data) > +{ > + pm_runtime_disable(data); > +} > + > +static int sec_qfprom_probe(struct platform_device *pdev) > +{ > + struct nvmem_config econfig = { > + .name = "sec-qfprom", > + .stride = 1, > + .word_size = 1, > + .id = NVMEM_DEVID_AUTO, > + .reg_read = sec_qfprom_reg_read, > + }; > + struct device *dev = &pdev->dev; > + struct resource *res; > + struct nvmem_device *nvmem; > + struct sec_qfprom_priv *priv; > + int ret; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + priv->qfpseccorrected = res->start; > + if (!priv->qfpseccorrected) > + return -ENOMEM; > + > + econfig.size = resource_size(res); > + econfig.dev = dev; > + econfig.priv = priv; > + > + priv->dev = dev; > + > + pm_runtime_enable(dev); > + ret = devm_add_action_or_reset(dev, sec_qfprom_runtime_disable, dev); > + if (ret) > + return ret; Please use devm_pm_runtime_enable(). > + > + nvmem = devm_nvmem_register(dev, &econfig); > + > + return PTR_ERR_OR_ZERO(nvmem); > +} > + > +static const struct of_device_id sec_qfprom_of_match[] = { > + { .compatible = "qcom,sec-qfprom",}, > + {/* sentinel */}, > +}; > +MODULE_DEVICE_TABLE(of, sec_qfprom_of_match); > + > +static struct platform_driver qfprom_driver = { > + .probe = sec_qfprom_probe, > + .driver = { > + .name = "qcom,sec_qfprom", No comma here please, qcom_sec_qfprom. > + .of_match_table = sec_qfprom_of_match, > + }, > +}; > +module_platform_driver(qfprom_driver); > +MODULE_DESCRIPTION("Qualcomm Secure QFPROM driver"); > +MODULE_LICENSE("GPL v2"); Please change this to "GPL". Regards, Bjorn