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129 lines
3.1 KiB
129 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ARM Integrator Logical Module bus driver |
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* Copyright (C) 2020 Linaro Ltd. |
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* Author: Linus Walleij <[email protected]> |
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* |
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* See the device tree bindings for this block for more details on the |
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* hardware. |
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*/ |
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#include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_platform.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/bitops.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/regmap.h> |
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/* All information about the connected logic modules are in here */ |
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#define INTEGRATOR_SC_DEC_OFFSET 0x10 |
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/* Base address for the expansion modules */ |
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#define INTEGRATOR_AP_EXP_BASE 0xc0000000 |
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#define INTEGRATOR_AP_EXP_STRIDE 0x10000000 |
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static int integrator_lm_populate(int num, struct device *dev) |
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{ |
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struct device_node *np = dev->of_node; |
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struct device_node *child; |
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u32 base; |
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int ret; |
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base = INTEGRATOR_AP_EXP_BASE + (num * INTEGRATOR_AP_EXP_STRIDE); |
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/* Walk over the child nodes and see what chipselects we use */ |
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for_each_available_child_of_node(np, child) { |
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struct resource res; |
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ret = of_address_to_resource(child, 0, &res); |
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if (ret) { |
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dev_info(dev, "no valid address on child\n"); |
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continue; |
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} |
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/* First populate the syscon then any devices */ |
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if (res.start == base) { |
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dev_info(dev, "populate module @0x%08x from DT\n", |
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base); |
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ret = of_platform_default_populate(child, NULL, dev); |
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if (ret) { |
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dev_err(dev, "failed to populate module\n"); |
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of_node_put(child); |
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return ret; |
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} |
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} |
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} |
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return 0; |
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} |
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static const struct of_device_id integrator_ap_syscon_match[] = { |
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{ .compatible = "arm,integrator-ap-syscon"}, |
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{ }, |
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}; |
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static int integrator_ap_lm_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *syscon; |
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static struct regmap *map; |
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u32 val; |
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int ret; |
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int i; |
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/* Look up the system controller */ |
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syscon = of_find_matching_node(NULL, integrator_ap_syscon_match); |
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if (!syscon) { |
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dev_err(dev, |
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"could not find Integrator/AP system controller\n"); |
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return -ENODEV; |
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} |
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map = syscon_node_to_regmap(syscon); |
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if (IS_ERR(map)) { |
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dev_err(dev, |
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"could not find Integrator/AP system controller\n"); |
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return PTR_ERR(map); |
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} |
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ret = regmap_read(map, INTEGRATOR_SC_DEC_OFFSET, &val); |
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if (ret) { |
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dev_err(dev, "could not read from Integrator/AP syscon\n"); |
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return ret; |
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} |
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/* Loop over the connected modules */ |
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for (i = 0; i < 4; i++) { |
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if (!(val & BIT(4 + i))) |
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continue; |
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dev_info(dev, "detected module in slot %d\n", i); |
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ret = integrator_lm_populate(i, dev); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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static const struct of_device_id integrator_ap_lm_match[] = { |
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{ .compatible = "arm,integrator-ap-lm"}, |
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{ }, |
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}; |
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static struct platform_driver integrator_ap_lm_driver = { |
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.probe = integrator_ap_lm_probe, |
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.driver = { |
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.name = "integratorap-lm", |
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.of_match_table = integrator_ap_lm_match, |
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}, |
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}; |
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module_platform_driver(integrator_ap_lm_driver); |
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MODULE_AUTHOR("Linus Walleij <[email protected]>"); |
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MODULE_DESCRIPTION("Integrator AP Logical Module driver"); |
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MODULE_LICENSE("GPL v2");
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