Messages in this thread Patch in this message | | | From | Andreas Färber <> | Subject | [RFC 02/11] soc: Add Realtek chip info driver for RTD1195 and RTD1295 | Date | Sun, 3 Nov 2019 02:36:36 +0100 |
| |
Add a soc bus driver to print chip model and revision details.
Revisions from downstream drivers/soc/realtek/rtd{119x,129x}/rtk_chip.c.
Signed-off-by: Andreas Färber <afaerber@suse.de> --- Naming: What to call the family vs. soc_id? drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/realtek/Kconfig | 13 ++++ drivers/soc/realtek/Makefile | 2 + drivers/soc/realtek/chip.c | 164 +++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 181 insertions(+) create mode 100644 drivers/soc/realtek/Kconfig create mode 100644 drivers/soc/realtek/Makefile create mode 100644 drivers/soc/realtek/chip.c
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 833e04a7835c..06ae9d97321c 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -11,6 +11,7 @@ source "drivers/soc/imx/Kconfig" source "drivers/soc/ixp4xx/Kconfig" source "drivers/soc/mediatek/Kconfig" source "drivers/soc/qcom/Kconfig" +source "drivers/soc/realtek/Kconfig" source "drivers/soc/renesas/Kconfig" source "drivers/soc/rockchip/Kconfig" source "drivers/soc/samsung/Kconfig" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 2ec355003524..1d55d838a342 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_SOC_XWAY) += lantiq/ obj-y += mediatek/ obj-y += amlogic/ obj-y += qcom/ +obj-y += realtek/ obj-y += renesas/ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ obj-$(CONFIG_SOC_SAMSUNG) += samsung/ diff --git a/drivers/soc/realtek/Kconfig b/drivers/soc/realtek/Kconfig new file mode 100644 index 000000000000..be75c1889c61 --- /dev/null +++ b/drivers/soc/realtek/Kconfig @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-or-later +if ARCH_REALTEK || COMPILE_TEST + +config REALTEK_SOC + tristate "Realtek chip info" + default ARCH_REALTEK + select SOC_BUS + help + Say 'y' here to enable support for SoC info on Realtek RTD1195 and + RTD1295 SoC families. + If unsure, say 'n'. + +endif diff --git a/drivers/soc/realtek/Makefile b/drivers/soc/realtek/Makefile new file mode 100644 index 000000000000..49900273905b --- /dev/null +++ b/drivers/soc/realtek/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-or-later +obj-$(CONFIG_REALTEK_SOC) += chip.o diff --git a/drivers/soc/realtek/chip.c b/drivers/soc/realtek/chip.c new file mode 100644 index 000000000000..9d13422e9936 --- /dev/null +++ b/drivers/soc/realtek/chip.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Realtek System-on-Chip info + * + * Copyright (c) 2017-2019 Andreas Färber + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/sys_soc.h> + +#define REG_CHIP_ID 0x0 +#define REG_CHIP_REV 0x4 + +struct rtd_soc_revision { + const char *name; + u32 chip_rev; +}; + +static const struct rtd_soc_revision rtd1195_revisions[] = { + { "A", 0x00000000 }, + { "B", 0x00010000 }, + { "C", 0x00020000 }, + { "D", 0x00030000 }, + { } +}; + +static const struct rtd_soc_revision rtd1295_revisions[] = { + { "A00", 0x00000000 }, + { "A01", 0x00010000 }, + { "B00", 0x00020000 }, + { "B01", 0x00030000 }, + { } +}; + +struct rtd_soc { + u32 chip_id; + const char *family; + const char *(*get_name)(struct device *dev, const struct rtd_soc *s); + const struct rtd_soc_revision *revisions; + const char *codename; +}; + +static const char *default_name(struct device *dev, const struct rtd_soc *s) +{ + return s->family; +} + +static const struct rtd_soc rtd_soc_families[] = { + { 0x00006329, "RTD1195", default_name, rtd1195_revisions, "Phoenix" }, + { 0x00006421, "RTD1295", default_name, rtd1295_revisions, "Kylin" }, +}; + +static const struct rtd_soc *rtd_soc_by_chip_id(u32 chip_id) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(rtd_soc_families); i++) { + const struct rtd_soc *family = &rtd_soc_families[i]; + + if (family->chip_id == chip_id) + return family; + } + return NULL; +} + +static const char *rtd_soc_rev(const struct rtd_soc *family, u32 chip_rev) +{ + if (family) { + const struct rtd_soc_revision *rev = family->revisions; + + while (rev && rev->name) { + if (rev->chip_rev == chip_rev) + return rev->name; + rev++; + } + } + return "unknown"; +} + +static int rtd_soc_probe(struct platform_device *pdev) +{ + const struct rtd_soc *s; + struct soc_device_attribute *soc_dev_attr; + struct soc_device *soc_dev; + struct device_node *node; + void __iomem *base; + u32 chip_id, chip_rev; + + base = of_iomap(pdev->dev.of_node, 0); + if (!base) + return -ENODEV; + + soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); + if (!soc_dev_attr) + return -ENOMEM; + + chip_id = readl_relaxed(base + REG_CHIP_ID); + chip_rev = readl_relaxed(base + REG_CHIP_REV); + + node = of_find_node_by_path("/"); + of_property_read_string(node, "model", &soc_dev_attr->machine); + of_node_put(node); + + s = rtd_soc_by_chip_id(chip_id); + + soc_dev_attr->family = kasprintf(GFP_KERNEL, "Realtek %s", + (s && s->codename) ? s->codename : + ((s && s->family) ? s->family : "Digital Home Center")); + + if (likely(s && s->get_name)) + soc_dev_attr->soc_id = s->get_name(&pdev->dev, s); + else + soc_dev_attr->soc_id = "unknown"; + + soc_dev_attr->revision = rtd_soc_rev(s, chip_rev); + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) { + kfree(soc_dev_attr->family); + kfree(soc_dev_attr); + return PTR_ERR(soc_dev); + } + + platform_set_drvdata(pdev, soc_dev); + + dev_info(soc_device_to_device(soc_dev), + "%s %s (0x%08x) rev %s (0x%08x) detected\n", + soc_dev_attr->family, soc_dev_attr->soc_id, chip_id, + soc_dev_attr->revision, chip_rev); + + return 0; +} + +static int rtd_soc_remove(struct platform_device *pdev) +{ + struct soc_device *soc_dev = platform_get_drvdata(pdev); + + soc_device_unregister(soc_dev); + + return 0; +} + +static const struct of_device_id rtd_soc_dt_ids[] = { + { .compatible = "realtek,rtd1195-chip" }, + { } +}; + +static struct platform_driver rtd_soc_driver = { + .probe = rtd_soc_probe, + .remove = rtd_soc_remove, + .driver = { + .name = "rtd1195-soc", + .of_match_table = rtd_soc_dt_ids, + }, +}; +module_platform_driver(rtd_soc_driver); + +MODULE_DESCRIPTION("Realtek SoC identification"); +MODULE_LICENSE("GPL"); -- 2.16.4
| |