1 /* 2 * TI AMx3 Wakeup M3 Remote Processor driver 3 * 4 * Copyright (C) 2014-2015 Texas Instruments, Inc. 5 * 6 * Dave Gerlach <d-gerlach@ti.com> 7 * Suman Anna <s-anna@ti.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * version 2 as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/err.h> 20 #include <linux/interrupt.h> 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/of_device.h> 24 #include <linux/of_address.h> 25 #include <linux/platform_device.h> 26 #include <linux/pm_runtime.h> 27 #include <linux/remoteproc.h> 28 29 #include <linux/platform_data/wkup_m3.h> 30 31 #include "remoteproc_internal.h" 32 33 #define WKUPM3_MEM_MAX 2 34 35 /** 36 * struct wkup_m3_mem - WkupM3 internal memory structure 37 * @cpu_addr: MPU virtual address of the memory region 38 * @bus_addr: Bus address used to access the memory region 39 * @dev_addr: Device address from Wakeup M3 view 40 * @size: Size of the memory region 41 */ 42 struct wkup_m3_mem { 43 void __iomem *cpu_addr; 44 phys_addr_t bus_addr; 45 u32 dev_addr; 46 size_t size; 47 }; 48 49 /** 50 * struct wkup_m3_rproc - WkupM3 remote processor state 51 * @rproc: rproc handle 52 * @pdev: pointer to platform device 53 * @mem: WkupM3 memory information 54 */ 55 struct wkup_m3_rproc { 56 struct rproc *rproc; 57 struct platform_device *pdev; 58 struct wkup_m3_mem mem[WKUPM3_MEM_MAX]; 59 }; 60 61 static int wkup_m3_rproc_start(struct rproc *rproc) 62 { 63 struct wkup_m3_rproc *wkupm3 = rproc->priv; 64 struct platform_device *pdev = wkupm3->pdev; 65 struct device *dev = &pdev->dev; 66 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); 67 68 if (pdata->deassert_reset(pdev, pdata->reset_name)) { 69 dev_err(dev, "Unable to reset wkup_m3!\n"); 70 return -ENODEV; 71 } 72 73 return 0; 74 } 75 76 static int wkup_m3_rproc_stop(struct rproc *rproc) 77 { 78 struct wkup_m3_rproc *wkupm3 = rproc->priv; 79 struct platform_device *pdev = wkupm3->pdev; 80 struct device *dev = &pdev->dev; 81 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); 82 83 if (pdata->assert_reset(pdev, pdata->reset_name)) { 84 dev_err(dev, "Unable to assert reset of wkup_m3!\n"); 85 return -ENODEV; 86 } 87 88 return 0; 89 } 90 91 static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len) 92 { 93 struct wkup_m3_rproc *wkupm3 = rproc->priv; 94 void *va = NULL; 95 int i; 96 u32 offset; 97 98 if (len <= 0) 99 return NULL; 100 101 for (i = 0; i < WKUPM3_MEM_MAX; i++) { 102 if (da >= wkupm3->mem[i].dev_addr && da + len <= 103 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) { 104 offset = da - wkupm3->mem[i].dev_addr; 105 /* __force to make sparse happy with type conversion */ 106 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset); 107 break; 108 } 109 } 110 111 return va; 112 } 113 114 static struct rproc_ops wkup_m3_rproc_ops = { 115 .start = wkup_m3_rproc_start, 116 .stop = wkup_m3_rproc_stop, 117 .da_to_va = wkup_m3_rproc_da_to_va, 118 }; 119 120 static const struct of_device_id wkup_m3_rproc_of_match[] = { 121 { .compatible = "ti,am3352-wkup-m3", }, 122 { .compatible = "ti,am4372-wkup-m3", }, 123 {}, 124 }; 125 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match); 126 127 static int wkup_m3_rproc_probe(struct platform_device *pdev) 128 { 129 struct device *dev = &pdev->dev; 130 struct wkup_m3_platform_data *pdata = dev->platform_data; 131 /* umem always needs to be processed first */ 132 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" }; 133 struct wkup_m3_rproc *wkupm3; 134 const char *fw_name; 135 struct rproc *rproc; 136 struct resource *res; 137 const __be32 *addrp; 138 u32 l4_offset = 0; 139 u64 size; 140 int ret; 141 int i; 142 143 if (!(pdata && pdata->deassert_reset && pdata->assert_reset && 144 pdata->reset_name)) { 145 dev_err(dev, "Platform data missing!\n"); 146 return -ENODEV; 147 } 148 149 ret = of_property_read_string(dev->of_node, "ti,pm-firmware", 150 &fw_name); 151 if (ret) { 152 dev_err(dev, "No firmware filename given\n"); 153 return -ENODEV; 154 } 155 156 pm_runtime_enable(&pdev->dev); 157 ret = pm_runtime_get_sync(&pdev->dev); 158 if (ret < 0) { 159 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n"); 160 goto err; 161 } 162 163 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops, 164 fw_name, sizeof(*wkupm3)); 165 if (!rproc) { 166 ret = -ENOMEM; 167 goto err; 168 } 169 170 wkupm3 = rproc->priv; 171 wkupm3->rproc = rproc; 172 wkupm3->pdev = pdev; 173 174 for (i = 0; i < ARRAY_SIZE(mem_names); i++) { 175 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 176 mem_names[i]); 177 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res); 178 if (IS_ERR(wkupm3->mem[i].cpu_addr)) { 179 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n", 180 i); 181 ret = PTR_ERR(wkupm3->mem[i].cpu_addr); 182 goto err; 183 } 184 wkupm3->mem[i].bus_addr = res->start; 185 wkupm3->mem[i].size = resource_size(res); 186 addrp = of_get_address(dev->of_node, i, &size, NULL); 187 /* 188 * The wkupm3 has umem at address 0 in its view, so the device 189 * addresses for each memory region is computed as a relative 190 * offset of the bus address for umem, and therefore needs to be 191 * processed first. 192 */ 193 if (!strcmp(mem_names[i], "umem")) 194 l4_offset = be32_to_cpu(*addrp); 195 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset; 196 } 197 198 dev_set_drvdata(dev, rproc); 199 200 ret = rproc_add(rproc); 201 if (ret) { 202 dev_err(dev, "rproc_add failed\n"); 203 goto err_put_rproc; 204 } 205 206 return 0; 207 208 err_put_rproc: 209 rproc_put(rproc); 210 err: 211 pm_runtime_put_noidle(dev); 212 pm_runtime_disable(dev); 213 return ret; 214 } 215 216 static int wkup_m3_rproc_remove(struct platform_device *pdev) 217 { 218 struct rproc *rproc = platform_get_drvdata(pdev); 219 220 rproc_del(rproc); 221 rproc_put(rproc); 222 pm_runtime_put_sync(&pdev->dev); 223 pm_runtime_disable(&pdev->dev); 224 225 return 0; 226 } 227 228 #ifdef CONFIG_PM 229 static int wkup_m3_rpm_suspend(struct device *dev) 230 { 231 return -EBUSY; 232 } 233 234 static int wkup_m3_rpm_resume(struct device *dev) 235 { 236 return 0; 237 } 238 #endif 239 240 static const struct dev_pm_ops wkup_m3_rproc_pm_ops = { 241 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL) 242 }; 243 244 static struct platform_driver wkup_m3_rproc_driver = { 245 .probe = wkup_m3_rproc_probe, 246 .remove = wkup_m3_rproc_remove, 247 .driver = { 248 .name = "wkup_m3_rproc", 249 .of_match_table = wkup_m3_rproc_of_match, 250 .pm = &wkup_m3_rproc_pm_ops, 251 }, 252 }; 253 254 module_platform_driver(wkup_m3_rproc_driver); 255 256 MODULE_LICENSE("GPL v2"); 257 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver"); 258 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>"); 259