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