1f36e789aSThor Thayer // SPDX-License-Identifier: GPL-2.0
2f36e789aSThor Thayer /*
3f36e789aSThor Thayer * Copyright (C) 2018-2019, Intel Corporation.
4f36e789aSThor Thayer * Copyright (C) 2012 Freescale Semiconductor, Inc.
5f36e789aSThor Thayer * Copyright (C) 2012 Linaro Ltd.
6f36e789aSThor Thayer *
7f36e789aSThor Thayer * Based on syscon driver.
8f36e789aSThor Thayer */
9f36e789aSThor Thayer
10f36e789aSThor Thayer #include <linux/arm-smccc.h>
11f36e789aSThor Thayer #include <linux/err.h>
12f36e789aSThor Thayer #include <linux/io.h>
13f36e789aSThor Thayer #include <linux/mfd/altera-sysmgr.h>
14f36e789aSThor Thayer #include <linux/mfd/syscon.h>
15f36e789aSThor Thayer #include <linux/module.h>
16f36e789aSThor Thayer #include <linux/of.h>
17dc0c386eSRob Herring #include <linux/platform_device.h>
18f36e789aSThor Thayer #include <linux/regmap.h>
19f36e789aSThor Thayer #include <linux/slab.h>
20f36e789aSThor Thayer
21f36e789aSThor Thayer /**
22f36e789aSThor Thayer * struct altr_sysmgr - Altera SOCFPGA System Manager
23f36e789aSThor Thayer * @regmap: the regmap used for System Manager accesses.
24f36e789aSThor Thayer */
25f36e789aSThor Thayer struct altr_sysmgr {
26f36e789aSThor Thayer struct regmap *regmap;
27f36e789aSThor Thayer };
28f36e789aSThor Thayer
29f36e789aSThor Thayer static struct platform_driver altr_sysmgr_driver;
30f36e789aSThor Thayer
31f36e789aSThor Thayer /**
32f36e789aSThor Thayer * s10_protected_reg_write
33f36e789aSThor Thayer * Write to a protected SMC register.
34f36e789aSThor Thayer * @base: Base address of System Manager
35f36e789aSThor Thayer * @reg: Address offset of register
36f36e789aSThor Thayer * @val: Value to write
37f36e789aSThor Thayer * Return: INTEL_SIP_SMC_STATUS_OK (0) on success
38f36e789aSThor Thayer * INTEL_SIP_SMC_REG_ERROR on error
39f36e789aSThor Thayer * INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported
40f36e789aSThor Thayer */
s10_protected_reg_write(void * base,unsigned int reg,unsigned int val)41f36e789aSThor Thayer static int s10_protected_reg_write(void *base,
42f36e789aSThor Thayer unsigned int reg, unsigned int val)
43f36e789aSThor Thayer {
44f36e789aSThor Thayer struct arm_smccc_res result;
45f36e789aSThor Thayer unsigned long sysmgr_base = (unsigned long)base;
46f36e789aSThor Thayer
47f36e789aSThor Thayer arm_smccc_smc(INTEL_SIP_SMC_REG_WRITE, sysmgr_base + reg,
48f36e789aSThor Thayer val, 0, 0, 0, 0, 0, &result);
49f36e789aSThor Thayer
50f36e789aSThor Thayer return (int)result.a0;
51f36e789aSThor Thayer }
52f36e789aSThor Thayer
53f36e789aSThor Thayer /**
54f36e789aSThor Thayer * s10_protected_reg_read
55f36e789aSThor Thayer * Read the status of a protected SMC register
56f36e789aSThor Thayer * @base: Base address of System Manager.
57f36e789aSThor Thayer * @reg: Address of register
58f36e789aSThor Thayer * @val: Value read.
59f36e789aSThor Thayer * Return: INTEL_SIP_SMC_STATUS_OK (0) on success
60f36e789aSThor Thayer * INTEL_SIP_SMC_REG_ERROR on error
61f36e789aSThor Thayer * INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported
62f36e789aSThor Thayer */
s10_protected_reg_read(void * base,unsigned int reg,unsigned int * val)63f36e789aSThor Thayer static int s10_protected_reg_read(void *base,
64f36e789aSThor Thayer unsigned int reg, unsigned int *val)
65f36e789aSThor Thayer {
66f36e789aSThor Thayer struct arm_smccc_res result;
67f36e789aSThor Thayer unsigned long sysmgr_base = (unsigned long)base;
68f36e789aSThor Thayer
69f36e789aSThor Thayer arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sysmgr_base + reg,
70f36e789aSThor Thayer 0, 0, 0, 0, 0, 0, &result);
71f36e789aSThor Thayer
72f36e789aSThor Thayer *val = (unsigned int)result.a1;
73f36e789aSThor Thayer
74f36e789aSThor Thayer return (int)result.a0;
75f36e789aSThor Thayer }
76f36e789aSThor Thayer
77f36e789aSThor Thayer static struct regmap_config altr_sysmgr_regmap_cfg = {
78f36e789aSThor Thayer .name = "altr_sysmgr",
79f36e789aSThor Thayer .reg_bits = 32,
80f36e789aSThor Thayer .reg_stride = 4,
81f36e789aSThor Thayer .val_bits = 32,
82f36e789aSThor Thayer .fast_io = true,
83f36e789aSThor Thayer .use_single_read = true,
84f36e789aSThor Thayer .use_single_write = true,
85f36e789aSThor Thayer };
86f36e789aSThor Thayer
87f36e789aSThor Thayer /**
88f36e789aSThor Thayer * altr_sysmgr_regmap_lookup_by_phandle
89f36e789aSThor Thayer * Find the sysmgr previous configured in probe() and return regmap property.
90f36e789aSThor Thayer * Return: regmap if found or error if not found.
910824c889SLee Jones *
920824c889SLee Jones * @np: Pointer to device's Device Tree node
930824c889SLee Jones * @property: Device Tree property name which references the sysmgr
94f36e789aSThor Thayer */
altr_sysmgr_regmap_lookup_by_phandle(struct device_node * np,const char * property)95f36e789aSThor Thayer struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np,
96f36e789aSThor Thayer const char *property)
97f36e789aSThor Thayer {
98f36e789aSThor Thayer struct device *dev;
99f36e789aSThor Thayer struct altr_sysmgr *sysmgr;
100f36e789aSThor Thayer struct device_node *sysmgr_np;
101f36e789aSThor Thayer
102f36e789aSThor Thayer if (property)
103f36e789aSThor Thayer sysmgr_np = of_parse_phandle(np, property, 0);
104f36e789aSThor Thayer else
105f36e789aSThor Thayer sysmgr_np = np;
106f36e789aSThor Thayer
107f36e789aSThor Thayer if (!sysmgr_np)
108f36e789aSThor Thayer return ERR_PTR(-ENODEV);
109f36e789aSThor Thayer
110cfba5de9SSuzuki K Poulose dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver,
111cfba5de9SSuzuki K Poulose (void *)sysmgr_np);
112*18421148SPeter Griffin if (property)
113f36e789aSThor Thayer of_node_put(sysmgr_np);
114*18421148SPeter Griffin
115f36e789aSThor Thayer if (!dev)
116f36e789aSThor Thayer return ERR_PTR(-EPROBE_DEFER);
117f36e789aSThor Thayer
118f36e789aSThor Thayer sysmgr = dev_get_drvdata(dev);
119f36e789aSThor Thayer
120f36e789aSThor Thayer return sysmgr->regmap;
121f36e789aSThor Thayer }
122f36e789aSThor Thayer EXPORT_SYMBOL_GPL(altr_sysmgr_regmap_lookup_by_phandle);
123f36e789aSThor Thayer
sysmgr_probe(struct platform_device * pdev)124f36e789aSThor Thayer static int sysmgr_probe(struct platform_device *pdev)
125f36e789aSThor Thayer {
126f36e789aSThor Thayer struct altr_sysmgr *sysmgr;
127f36e789aSThor Thayer struct regmap *regmap;
128f36e789aSThor Thayer struct resource *res;
129f36e789aSThor Thayer struct regmap_config sysmgr_config = altr_sysmgr_regmap_cfg;
130f36e789aSThor Thayer struct device *dev = &pdev->dev;
131f36e789aSThor Thayer struct device_node *np = dev->of_node;
132d9ca7801SLee Jones void __iomem *base;
133f36e789aSThor Thayer
134f36e789aSThor Thayer sysmgr = devm_kzalloc(dev, sizeof(*sysmgr), GFP_KERNEL);
135f36e789aSThor Thayer if (!sysmgr)
136f36e789aSThor Thayer return -ENOMEM;
137f36e789aSThor Thayer
138f36e789aSThor Thayer res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
139f36e789aSThor Thayer if (!res)
140f36e789aSThor Thayer return -ENOENT;
141f36e789aSThor Thayer
142f36e789aSThor Thayer sysmgr_config.max_register = resource_size(res) -
143f36e789aSThor Thayer sysmgr_config.reg_stride;
144f36e789aSThor Thayer if (of_device_is_compatible(np, "altr,sys-mgr-s10")) {
145f36e789aSThor Thayer sysmgr_config.reg_read = s10_protected_reg_read;
146f36e789aSThor Thayer sysmgr_config.reg_write = s10_protected_reg_write;
147f36e789aSThor Thayer
148d9ca7801SLee Jones /* Need physical address for SMCC call */
149b0b5b16bSArnd Bergmann regmap = devm_regmap_init(dev, NULL,
150b0b5b16bSArnd Bergmann (void *)(uintptr_t)res->start,
151f36e789aSThor Thayer &sysmgr_config);
152f36e789aSThor Thayer } else {
153d9ca7801SLee Jones base = devm_ioremap(dev, res->start, resource_size(res));
154d9ca7801SLee Jones if (!base)
155f36e789aSThor Thayer return -ENOMEM;
156f36e789aSThor Thayer
157fae2570dSKai Song sysmgr_config.max_register = resource_size(res) - 4;
158d9ca7801SLee Jones regmap = devm_regmap_init_mmio(dev, base, &sysmgr_config);
159f36e789aSThor Thayer }
160f36e789aSThor Thayer
161f36e789aSThor Thayer if (IS_ERR(regmap)) {
162f36e789aSThor Thayer pr_err("regmap init failed\n");
163f36e789aSThor Thayer return PTR_ERR(regmap);
164f36e789aSThor Thayer }
165f36e789aSThor Thayer
166f36e789aSThor Thayer sysmgr->regmap = regmap;
167f36e789aSThor Thayer
168f36e789aSThor Thayer platform_set_drvdata(pdev, sysmgr);
169f36e789aSThor Thayer
170f36e789aSThor Thayer return 0;
171f36e789aSThor Thayer }
172f36e789aSThor Thayer
173f36e789aSThor Thayer static const struct of_device_id altr_sysmgr_of_match[] = {
174f36e789aSThor Thayer { .compatible = "altr,sys-mgr" },
175f36e789aSThor Thayer { .compatible = "altr,sys-mgr-s10" },
176f36e789aSThor Thayer {},
177f36e789aSThor Thayer };
178f36e789aSThor Thayer MODULE_DEVICE_TABLE(of, altr_sysmgr_of_match);
179f36e789aSThor Thayer
180f36e789aSThor Thayer static struct platform_driver altr_sysmgr_driver = {
181f36e789aSThor Thayer .probe = sysmgr_probe,
182f36e789aSThor Thayer .driver = {
183f36e789aSThor Thayer .name = "altr,system_manager",
184f36e789aSThor Thayer .of_match_table = altr_sysmgr_of_match,
185f36e789aSThor Thayer },
186f36e789aSThor Thayer };
187f36e789aSThor Thayer
altr_sysmgr_init(void)188f36e789aSThor Thayer static int __init altr_sysmgr_init(void)
189f36e789aSThor Thayer {
190f36e789aSThor Thayer return platform_driver_register(&altr_sysmgr_driver);
191f36e789aSThor Thayer }
192f36e789aSThor Thayer core_initcall(altr_sysmgr_init);
193f36e789aSThor Thayer
altr_sysmgr_exit(void)194f36e789aSThor Thayer static void __exit altr_sysmgr_exit(void)
195f36e789aSThor Thayer {
196f36e789aSThor Thayer platform_driver_unregister(&altr_sysmgr_driver);
197f36e789aSThor Thayer }
198f36e789aSThor Thayer module_exit(altr_sysmgr_exit);
199f36e789aSThor Thayer
200f36e789aSThor Thayer MODULE_AUTHOR("Thor Thayer <>");
201f36e789aSThor Thayer MODULE_DESCRIPTION("SOCFPGA System Manager driver");
202