Julien Massot | 285892a | 2021-12-07 17:58:29 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (C) IoT.bzh 2021 |
| 4 | */ |
| 5 | |
| 6 | #include <linux/limits.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/of_device.h> |
| 9 | #include <linux/of_reserved_mem.h> |
| 10 | #include <linux/pm_runtime.h> |
| 11 | #include <linux/remoteproc.h> |
| 12 | #include <linux/reset.h> |
| 13 | #include <linux/soc/renesas/rcar-rst.h> |
| 14 | |
| 15 | #include "remoteproc_internal.h" |
| 16 | |
| 17 | struct rcar_rproc { |
| 18 | struct reset_control *rst; |
| 19 | }; |
| 20 | |
| 21 | static int rcar_rproc_mem_alloc(struct rproc *rproc, |
| 22 | struct rproc_mem_entry *mem) |
| 23 | { |
| 24 | struct device *dev = &rproc->dev; |
| 25 | void *va; |
| 26 | |
| 27 | dev_dbg(dev, "map memory: %pa+%zx\n", &mem->dma, mem->len); |
| 28 | va = ioremap_wc(mem->dma, mem->len); |
| 29 | if (!va) { |
| 30 | dev_err(dev, "Unable to map memory region: %pa+%zx\n", |
| 31 | &mem->dma, mem->len); |
| 32 | return -ENOMEM; |
| 33 | } |
| 34 | |
| 35 | /* Update memory entry va */ |
| 36 | mem->va = va; |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static int rcar_rproc_mem_release(struct rproc *rproc, |
| 42 | struct rproc_mem_entry *mem) |
| 43 | { |
| 44 | dev_dbg(&rproc->dev, "unmap memory: %pa\n", &mem->dma); |
| 45 | iounmap(mem->va); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int rcar_rproc_prepare(struct rproc *rproc) |
| 51 | { |
| 52 | struct device *dev = rproc->dev.parent; |
| 53 | struct device_node *np = dev->of_node; |
| 54 | struct of_phandle_iterator it; |
| 55 | struct rproc_mem_entry *mem; |
| 56 | struct reserved_mem *rmem; |
| 57 | u32 da; |
| 58 | |
| 59 | /* Register associated reserved memory regions */ |
| 60 | of_phandle_iterator_init(&it, np, "memory-region", NULL, 0); |
| 61 | while (of_phandle_iterator_next(&it) == 0) { |
| 62 | |
| 63 | rmem = of_reserved_mem_lookup(it.node); |
| 64 | if (!rmem) { |
| 65 | dev_err(&rproc->dev, |
| 66 | "unable to acquire memory-region\n"); |
| 67 | return -EINVAL; |
| 68 | } |
| 69 | |
| 70 | if (rmem->base > U32_MAX) |
| 71 | return -EINVAL; |
| 72 | |
| 73 | /* No need to translate pa to da, R-Car use same map */ |
| 74 | da = rmem->base; |
| 75 | mem = rproc_mem_entry_init(dev, NULL, |
| 76 | rmem->base, |
| 77 | rmem->size, da, |
| 78 | rcar_rproc_mem_alloc, |
| 79 | rcar_rproc_mem_release, |
| 80 | it.node->name); |
| 81 | |
| 82 | if (!mem) |
| 83 | return -ENOMEM; |
| 84 | |
| 85 | rproc_add_carveout(rproc, mem); |
| 86 | } |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static int rcar_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw) |
| 92 | { |
| 93 | int ret; |
| 94 | |
| 95 | ret = rproc_elf_load_rsc_table(rproc, fw); |
| 96 | if (ret) |
| 97 | dev_info(&rproc->dev, "No resource table in elf\n"); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int rcar_rproc_start(struct rproc *rproc) |
| 103 | { |
| 104 | struct rcar_rproc *priv = rproc->priv; |
| 105 | int err; |
| 106 | |
| 107 | if (!rproc->bootaddr) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | err = rcar_rst_set_rproc_boot_addr(rproc->bootaddr); |
| 111 | if (err) { |
| 112 | dev_err(&rproc->dev, "failed to set rproc boot addr\n"); |
| 113 | return err; |
| 114 | } |
| 115 | |
| 116 | err = reset_control_deassert(priv->rst); |
| 117 | if (err) |
| 118 | dev_err(&rproc->dev, "failed to deassert reset\n"); |
| 119 | |
| 120 | return err; |
| 121 | } |
| 122 | |
| 123 | static int rcar_rproc_stop(struct rproc *rproc) |
| 124 | { |
| 125 | struct rcar_rproc *priv = rproc->priv; |
| 126 | int err; |
| 127 | |
| 128 | err = reset_control_assert(priv->rst); |
| 129 | if (err) |
| 130 | dev_err(&rproc->dev, "failed to assert reset\n"); |
| 131 | |
| 132 | return err; |
| 133 | } |
| 134 | |
| 135 | static struct rproc_ops rcar_rproc_ops = { |
| 136 | .prepare = rcar_rproc_prepare, |
| 137 | .start = rcar_rproc_start, |
| 138 | .stop = rcar_rproc_stop, |
| 139 | .load = rproc_elf_load_segments, |
| 140 | .parse_fw = rcar_rproc_parse_fw, |
| 141 | .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table, |
| 142 | .sanity_check = rproc_elf_sanity_check, |
| 143 | .get_boot_addr = rproc_elf_get_boot_addr, |
| 144 | |
| 145 | }; |
| 146 | |
| 147 | static int rcar_rproc_probe(struct platform_device *pdev) |
| 148 | { |
| 149 | struct device *dev = &pdev->dev; |
| 150 | struct device_node *np = dev->of_node; |
| 151 | struct rcar_rproc *priv; |
| 152 | struct rproc *rproc; |
| 153 | int ret; |
| 154 | |
| 155 | rproc = devm_rproc_alloc(dev, np->name, &rcar_rproc_ops, |
| 156 | NULL, sizeof(*priv)); |
| 157 | if (!rproc) |
| 158 | return -ENOMEM; |
| 159 | |
| 160 | priv = rproc->priv; |
| 161 | |
| 162 | priv->rst = devm_reset_control_get_exclusive(dev, NULL); |
| 163 | if (IS_ERR(priv->rst)) { |
| 164 | ret = PTR_ERR(priv->rst); |
| 165 | dev_err_probe(dev, ret, "fail to acquire rproc reset\n"); |
Julien Massot | ba63586 | 2021-12-16 17:07:21 +0100 | [diff] [blame] | 166 | return ret; |
Julien Massot | 285892a | 2021-12-07 17:58:29 +0100 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | pm_runtime_enable(dev); |
Julien Massot | b022960 | 2021-12-16 17:06:53 +0100 | [diff] [blame] | 170 | ret = pm_runtime_resume_and_get(dev); |
Julien Massot | 285892a | 2021-12-07 17:58:29 +0100 | [diff] [blame] | 171 | if (ret) { |
| 172 | dev_err(dev, "failed to power up\n"); |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | dev_set_drvdata(dev, rproc); |
| 177 | |
| 178 | /* Manually start the rproc */ |
| 179 | rproc->auto_boot = false; |
| 180 | |
| 181 | ret = devm_rproc_add(dev, rproc); |
| 182 | if (ret) { |
| 183 | dev_err(dev, "rproc_add failed\n"); |
| 184 | goto pm_disable; |
| 185 | } |
| 186 | |
| 187 | return 0; |
| 188 | |
| 189 | pm_disable: |
| 190 | pm_runtime_disable(dev); |
| 191 | |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | static int rcar_rproc_remove(struct platform_device *pdev) |
| 196 | { |
| 197 | struct device *dev = &pdev->dev; |
| 198 | |
| 199 | pm_runtime_disable(dev); |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static const struct of_device_id rcar_rproc_of_match[] = { |
| 205 | { .compatible = "renesas,rcar-cr7" }, |
| 206 | {}, |
| 207 | }; |
| 208 | |
| 209 | MODULE_DEVICE_TABLE(of, rcar_rproc_of_match); |
| 210 | |
| 211 | static struct platform_driver rcar_rproc_driver = { |
| 212 | .probe = rcar_rproc_probe, |
| 213 | .remove = rcar_rproc_remove, |
| 214 | .driver = { |
| 215 | .name = "rcar-rproc", |
| 216 | .of_match_table = rcar_rproc_of_match, |
| 217 | }, |
| 218 | }; |
| 219 | |
| 220 | module_platform_driver(rcar_rproc_driver); |
| 221 | |
| 222 | MODULE_LICENSE("GPL v2"); |
| 223 | MODULE_DESCRIPTION("Renesas R-Car Gen3 remote processor control driver"); |
| 224 | MODULE_AUTHOR("Julien Massot <julien.massot@iot.bzh>"); |