1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TI AMx3 Wakeup M3 Remote Processor driver 4 * 5 * Copyright (C) 2014-2015 Texas Instruments, Inc. 6 * 7 * Dave Gerlach <d-gerlach@ti.com> 8 * Suman Anna <s-anna@ti.com> 9 */ 10 11 #include <linux/err.h> 12 #include <linux/interrupt.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/of_device.h> 16 #include <linux/of_address.h> 17 #include <linux/platform_device.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/remoteproc.h> 20 21 #include <linux/platform_data/wkup_m3.h> 22 23 #include "remoteproc_internal.h" 24 25 #define WKUPM3_MEM_MAX 2 26 27 /** 28 * struct wkup_m3_mem - WkupM3 internal memory structure 29 * @cpu_addr: MPU virtual address of the memory region 30 * @bus_addr: Bus address used to access the memory region 31 * @dev_addr: Device address from Wakeup M3 view 32 * @size: Size of the memory region 33 */ 34 struct wkup_m3_mem { 35 void __iomem *cpu_addr; 36 phys_addr_t bus_addr; 37 u32 dev_addr; 38 size_t size; 39 }; 40 41 /** 42 * struct wkup_m3_rproc - WkupM3 remote processor state 43 * @rproc: rproc handle 44 * @pdev: pointer to platform device 45 * @mem: WkupM3 memory information 46 */ 47 struct wkup_m3_rproc { 48 struct rproc *rproc; 49 struct platform_device *pdev; 50 struct wkup_m3_mem mem[WKUPM3_MEM_MAX]; 51 }; 52 53 static int wkup_m3_rproc_start(struct rproc *rproc) 54 { 55 struct wkup_m3_rproc *wkupm3 = rproc->priv; 56 struct platform_device *pdev = wkupm3->pdev; 57 struct device *dev = &pdev->dev; 58 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); 59 60 if (pdata->deassert_reset(pdev, pdata->reset_name)) { 61 dev_err(dev, "Unable to reset wkup_m3!\n"); 62 return -ENODEV; 63 } 64 65 return 0; 66 } 67 68 static int wkup_m3_rproc_stop(struct rproc *rproc) 69 { 70 struct wkup_m3_rproc *wkupm3 = rproc->priv; 71 struct platform_device *pdev = wkupm3->pdev; 72 struct device *dev = &pdev->dev; 73 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); 74 75 if (pdata->assert_reset(pdev, pdata->reset_name)) { 76 dev_err(dev, "Unable to assert reset of wkup_m3!\n"); 77 return -ENODEV; 78 } 79 80 return 0; 81 } 82 83 static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len) 84 { 85 struct wkup_m3_rproc *wkupm3 = rproc->priv; 86 void *va = NULL; 87 int i; 88 u32 offset; 89 90 if (len == 0) 91 return NULL; 92 93 for (i = 0; i < WKUPM3_MEM_MAX; i++) { 94 if (da >= wkupm3->mem[i].dev_addr && da + len <= 95 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) { 96 offset = da - wkupm3->mem[i].dev_addr; 97 /* __force to make sparse happy with type conversion */ 98 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset); 99 break; 100 } 101 } 102 103 return va; 104 } 105 106 static const struct rproc_ops wkup_m3_rproc_ops = { 107 .start = wkup_m3_rproc_start, 108 .stop = wkup_m3_rproc_stop, 109 .da_to_va = wkup_m3_rproc_da_to_va, 110 }; 111 112 static const struct of_device_id wkup_m3_rproc_of_match[] = { 113 { .compatible = "ti,am3352-wkup-m3", }, 114 { .compatible = "ti,am4372-wkup-m3", }, 115 {}, 116 }; 117 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match); 118 119 static int wkup_m3_rproc_probe(struct platform_device *pdev) 120 { 121 struct device *dev = &pdev->dev; 122 struct wkup_m3_platform_data *pdata = dev->platform_data; 123 /* umem always needs to be processed first */ 124 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" }; 125 struct wkup_m3_rproc *wkupm3; 126 const char *fw_name; 127 struct rproc *rproc; 128 struct resource *res; 129 const __be32 *addrp; 130 u32 l4_offset = 0; 131 u64 size; 132 int ret; 133 int i; 134 135 if (!(pdata && pdata->deassert_reset && pdata->assert_reset && 136 pdata->reset_name)) { 137 dev_err(dev, "Platform data missing!\n"); 138 return -ENODEV; 139 } 140 141 ret = of_property_read_string(dev->of_node, "ti,pm-firmware", 142 &fw_name); 143 if (ret) { 144 dev_err(dev, "No firmware filename given\n"); 145 return -ENODEV; 146 } 147 148 pm_runtime_enable(&pdev->dev); 149 ret = pm_runtime_get_sync(&pdev->dev); 150 if (ret < 0) { 151 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n"); 152 goto err; 153 } 154 155 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops, 156 fw_name, sizeof(*wkupm3)); 157 if (!rproc) { 158 ret = -ENOMEM; 159 goto err; 160 } 161 162 rproc->auto_boot = false; 163 164 wkupm3 = rproc->priv; 165 wkupm3->rproc = rproc; 166 wkupm3->pdev = pdev; 167 168 for (i = 0; i < ARRAY_SIZE(mem_names); i++) { 169 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 170 mem_names[i]); 171 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res); 172 if (IS_ERR(wkupm3->mem[i].cpu_addr)) { 173 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n", 174 i); 175 ret = PTR_ERR(wkupm3->mem[i].cpu_addr); 176 goto err; 177 } 178 wkupm3->mem[i].bus_addr = res->start; 179 wkupm3->mem[i].size = resource_size(res); 180 addrp = of_get_address(dev->of_node, i, &size, NULL); 181 /* 182 * The wkupm3 has umem at address 0 in its view, so the device 183 * addresses for each memory region is computed as a relative 184 * offset of the bus address for umem, and therefore needs to be 185 * processed first. 186 */ 187 if (!strcmp(mem_names[i], "umem")) 188 l4_offset = be32_to_cpu(*addrp); 189 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset; 190 } 191 192 dev_set_drvdata(dev, rproc); 193 194 ret = rproc_add(rproc); 195 if (ret) { 196 dev_err(dev, "rproc_add failed\n"); 197 goto err_put_rproc; 198 } 199 200 return 0; 201 202 err_put_rproc: 203 rproc_free(rproc); 204 err: 205 pm_runtime_put_noidle(dev); 206 pm_runtime_disable(dev); 207 return ret; 208 } 209 210 static int wkup_m3_rproc_remove(struct platform_device *pdev) 211 { 212 struct rproc *rproc = platform_get_drvdata(pdev); 213 214 rproc_del(rproc); 215 rproc_free(rproc); 216 pm_runtime_put_sync(&pdev->dev); 217 pm_runtime_disable(&pdev->dev); 218 219 return 0; 220 } 221 222 #ifdef CONFIG_PM 223 static int wkup_m3_rpm_suspend(struct device *dev) 224 { 225 return -EBUSY; 226 } 227 228 static int wkup_m3_rpm_resume(struct device *dev) 229 { 230 return 0; 231 } 232 #endif 233 234 static const struct dev_pm_ops wkup_m3_rproc_pm_ops = { 235 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL) 236 }; 237 238 static struct platform_driver wkup_m3_rproc_driver = { 239 .probe = wkup_m3_rproc_probe, 240 .remove = wkup_m3_rproc_remove, 241 .driver = { 242 .name = "wkup_m3_rproc", 243 .of_match_table = wkup_m3_rproc_of_match, 244 .pm = &wkup_m3_rproc_pm_ops, 245 }, 246 }; 247 248 module_platform_driver(wkup_m3_rproc_driver); 249 250 MODULE_LICENSE("GPL v2"); 251 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver"); 252 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>"); 253