On Thu, 15 Nov 2018 at 16:12, Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> wrote: > > From: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> > > Exynos SoCs have Chipid, for identification of product IDs and SoC > revisions. This patch intends to provide initialization code for all > these functionalities, at the same time it provides some sysfs entries > for accessing these information to user-space. > > This driver uses existing binding for exynos-chipid. > > Changes by Bartlomiej: > - fixed return values on errors > - removed bogus kfree_const() > - added missing Exynos4210 EVT0 id > - converted code to use EXYNOS_MASK define > - fixed np use after of_node_put() > - fixed too early use of dev_info() > - made driver fail for unknown SoC-s > - added SPDX tag > - updated Copyrights > > Cc: Grant Likely <grant.likely@xxxxxxxxxxxx> > Cc: Rob Herring <robh+dt@xxxxxxxxxx> > Cc: Linus Walleij <linus.walleij@xxxxxxxxxx> > Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> > [m.szyprowski: for suggestion and code snippet of product_id_to_soc_id] > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > --- > drivers/soc/samsung/Kconfig | 5 ++ > drivers/soc/samsung/Makefile | 1 + > drivers/soc/samsung/exynos-chipid.c | 111 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 117 insertions(+) > create mode 100644 drivers/soc/samsung/exynos-chipid.c > > diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig > index 2186285..2905f52 100644 > --- a/drivers/soc/samsung/Kconfig > +++ b/drivers/soc/samsung/Kconfig > @@ -7,6 +7,11 @@ menuconfig SOC_SAMSUNG > > if SOC_SAMSUNG > > +config EXYNOS_CHIPID > + bool "Exynos Chipid controller driver" if COMPILE_TEST > + depends on ARCH_EXYNOS || COMPILE_TEST > + select SOC_BUS > + > config EXYNOS_PMU > bool "Exynos PMU controller driver" if COMPILE_TEST > depends on ARCH_EXYNOS || ((ARM || ARM64) && COMPILE_TEST) > diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile > index 29f294b..c2a8fbc 100644 > --- a/drivers/soc/samsung/Makefile > +++ b/drivers/soc/samsung/Makefile > @@ -1,4 +1,5 @@ > # SPDX-License-Identifier: GPL-2.0 > +obj-$(CONFIG_EXYNOS_CHIPID) += exynos-chipid.o > obj-$(CONFIG_EXYNOS_PMU) += exynos-pmu.o > > obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS) += exynos3250-pmu.o exynos4-pmu.o \ > diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c > new file mode 100644 > index 0000000..5cb0188 > --- /dev/null > +++ b/drivers/soc/samsung/exynos-chipid.c > @@ -0,0 +1,111 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2018 Samsung Electronics Co., Ltd. > + * http://www.samsung.com/ > + * > + * EXYNOS - CHIP ID support > + * Author: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> > + * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > + */ > + > +#include <linux/io.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> I think both platform headers are not used here. Best regards, Krzysztof > +#include <linux/slab.h> > +#include <linux/sys_soc.h> > + > +#define EXYNOS_SUBREV_MASK (0xF << 4) > +#define EXYNOS_MAINREV_MASK (0xF << 0) > +#define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | EXYNOS_MAINREV_MASK) > +#define EXYNOS_MASK 0xFFFFF000 > + > +static const struct exynos_soc_id { > + const char *name; > + unsigned int id; > +} soc_ids[] = { > + { "EXYNOS3250", 0xE3472000 }, > + { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */ > + { "EXYNOS4210", 0x43210000 }, > + { "EXYNOS4212", 0x43220000 }, > + { "EXYNOS4412", 0xE4412000 }, > + { "EXYNOS5250", 0x43520000 }, > + { "EXYNOS5260", 0xE5260000 }, > + { "EXYNOS5410", 0xE5410000 }, > + { "EXYNOS5420", 0xE5420000 }, > + { "EXYNOS5440", 0xE5440000 }, > + { "EXYNOS5800", 0xE5422000 }, > + { "EXYNOS7420", 0xE7420000 }, > + { "EXYNOS5433", 0xE5433000 }, > +}; > + > +static const char * __init product_id_to_soc_id(unsigned int product_id) > +{ > + int i; > + > + for (i = 0; i < ARRAY_SIZE(soc_ids); i++) > + if ((product_id & EXYNOS_MASK) == soc_ids[i].id) > + return soc_ids[i].name; > + return NULL; > +} > + > +int __init exynos_chipid_early_init(void) > +{ > + struct soc_device_attribute *soc_dev_attr; > + void __iomem *exynos_chipid_base; > + struct soc_device *soc_dev; > + struct device_node *root; > + struct device_node *np; > + u32 product_id; > + u32 revision; > + > + /* look up for chipid node */ > + np = of_find_compatible_node(NULL, NULL, "samsung,exynos4210-chipid"); > + if (!np) > + return -ENODEV; > + > + exynos_chipid_base = of_iomap(np, 0); > + of_node_put(np); > + > + if (!exynos_chipid_base) { > + pr_err("Failed to map SoC chipid\n"); > + return -ENXIO; > + } > + > + product_id = readl_relaxed(exynos_chipid_base); > + revision = product_id & EXYNOS_REV_MASK; > + iounmap(exynos_chipid_base); > + > + soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); > + if (!soc_dev_attr) > + return -ENOMEM; > + > + soc_dev_attr->family = "Samsung Exynos"; > + > + root = of_find_node_by_path("/"); > + of_property_read_string(root, "model", &soc_dev_attr->machine); > + of_node_put(root); > + > + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision); > + soc_dev_attr->soc_id = product_id_to_soc_id(product_id); > + if (!soc_dev_attr->soc_id) { > + pr_err("Unknown SoC\n"); > + return -ENODEV; > + } > + > + /* please note that the actual registration will be deferred */ > + soc_dev = soc_device_register(soc_dev_attr); > + if (IS_ERR(soc_dev)) { > + kfree(soc_dev_attr->revision); > + kfree(soc_dev_attr); > + return PTR_ERR(soc_dev); > + } > + > + /* it is too early to use dev_info() here (soc_dev is NULL) */ > + pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", > + soc_dev_attr->soc_id, product_id, revision); > + > + return 0; > +} > +early_initcall(exynos_chipid_early_init); > -- > 1.9.1 >
