diff options
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/bus/Makefile | 2 | ||||
| -rw-r--r-- | drivers/bus/arm-integrator-lm.c | 128 |
3 files changed, 138 insertions, 1 deletions
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index c16268c53831..2d73d4b6c9a6 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -20,6 +20,15 @@ config ARM_CCI400_PORT_CTRL Low level power management driver for CCI400 cache coherent interconnect for ARM platforms. +config ARM_INTEGRATOR_LM + bool "ARM Integrator Logic Module bus" + depends on HAS_IOMEM + depends on ARCH_INTEGRATOR || COMPILE_TEST + default ARCH_INTEGRATOR + help + Say y here to enable support for the ARM Logic Module bus + found on the ARM Integrator AP (Application Platform) + config BRCMSTB_GISB_ARB bool "Broadcom STB GISB bus arbiter" depends on ARM || ARM64 || MIPS diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index 05f32cd694a4..97552b427f12 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -5,7 +5,7 @@ # Interconnect bus drivers for ARM platforms obj-$(CONFIG_ARM_CCI) += arm-cci.o - +obj-$(CONFIG_ARM_INTEGRATOR_LM) += arm-integrator-lm.o obj-$(CONFIG_HISILICON_LPC) += hisi_lpc.o obj-$(CONFIG_BRCMSTB_GISB_ARB) += brcmstb_gisb.o obj-$(CONFIG_MOXTET) += moxtet.o diff --git a/drivers/bus/arm-integrator-lm.c b/drivers/bus/arm-integrator-lm.c new file mode 100644 index 000000000000..669ea7e1f92e --- /dev/null +++ b/drivers/bus/arm-integrator-lm.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ARM Integrator Logical Module bus driver + * Copyright (C) 2020 Linaro Ltd. + * Author: Linus Walleij <linus.walleij@linaro.org> + * + * See the device tree bindings for this block for more details on the + * hardware. + */ + +#include <linux/module.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/bitops.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> + +/* All information about the connected logic modules are in here */ +#define INTEGRATOR_SC_DEC_OFFSET 0x10 + +/* Base address for the expansion modules */ +#define INTEGRATOR_AP_EXP_BASE 0xc0000000 +#define INTEGRATOR_AP_EXP_STRIDE 0x10000000 + +static int integrator_lm_populate(int num, struct device *dev) +{ + struct device_node *np = dev->of_node; + struct device_node *child; + u32 base; + int ret; + + base = INTEGRATOR_AP_EXP_BASE + (num * INTEGRATOR_AP_EXP_STRIDE); + + /* Walk over the child nodes and see what chipselects we use */ + for_each_available_child_of_node(np, child) { + struct resource res; + + ret = of_address_to_resource(child, 0, &res); + if (ret) { + dev_info(dev, "no valid address on child\n"); + continue; + } + + /* First populate the syscon then any devices */ + if (res.start == base) { + dev_info(dev, "populate module @0x%08x from DT\n", + base); + ret = of_platform_default_populate(child, NULL, dev); + if (ret) { + dev_err(dev, "failed to populate module\n"); + return ret; + } + } + } + + return 0; +} + +static const struct of_device_id integrator_ap_syscon_match[] = { + { .compatible = "arm,integrator-ap-syscon"}, + { }, +}; + +static int integrator_ap_lm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *syscon; + static struct regmap *map; + u32 val; + int ret; + int i; + + /* Look up the system controller */ + syscon = of_find_matching_node(NULL, integrator_ap_syscon_match); + if (IS_ERR(syscon)) { + dev_err(dev, + "could not find Integrator/AP system controller\n"); + return PTR_ERR(syscon); + } + map = syscon_node_to_regmap(syscon); + if (IS_ERR(map)) { + dev_err(dev, + "could not find Integrator/AP system controller\n"); + return PTR_ERR(map); + } + + ret = regmap_read(map, INTEGRATOR_SC_DEC_OFFSET, &val); + if (ret) { + dev_err(dev, "could not read from Integrator/AP syscon\n"); + return ret; + } + + /* Loop over the connected modules */ + for (i = 0; i < 4; i++) { + if (!(val & BIT(4 + i))) + continue; + + dev_info(dev, "detected module in slot %d\n", i); + ret = integrator_lm_populate(i, dev); + if (ret) + return ret; + } + + return 0; +} + +static const struct of_device_id integrator_ap_lm_match[] = { + { .compatible = "arm,integrator-ap-lm"}, + { }, +}; + +static struct platform_driver integrator_ap_lm_driver = { + .probe = integrator_ap_lm_probe, + .driver = { + .name = "integratorap-lm", + .of_match_table = integrator_ap_lm_match, + }, +}; +module_platform_driver(integrator_ap_lm_driver); +MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); +MODULE_DESCRIPTION("Integrator AP Logical Module driver"); +MODULE_LICENSE("GPL v2"); |