1 /* 2 * Copyright (c) 2015, Christoph Hellwig. 3 */ 4 #include <linux/memblock.h> 5 #include <linux/platform_device.h> 6 #include <linux/slab.h> 7 #include <asm/e820.h> 8 #include <asm/page_types.h> 9 #include <asm/setup.h> 10 11 static __init void register_pmem_device(struct resource *res) 12 { 13 struct platform_device *pdev; 14 int error; 15 16 pdev = platform_device_alloc("pmem", PLATFORM_DEVID_AUTO); 17 if (!pdev) 18 return; 19 20 error = platform_device_add_resources(pdev, res, 1); 21 if (error) 22 goto out_put_pdev; 23 24 error = platform_device_add(pdev); 25 if (error) 26 goto out_put_pdev; 27 return; 28 29 out_put_pdev: 30 dev_warn(&pdev->dev, "failed to add 'pmem' (persistent memory) device!\n"); 31 platform_device_put(pdev); 32 } 33 34 static __init int register_pmem_devices(void) 35 { 36 int i; 37 38 for (i = 0; i < e820.nr_map; i++) { 39 struct e820entry *ei = &e820.map[i]; 40 41 if (ei->type == E820_PRAM) { 42 struct resource res = { 43 .flags = IORESOURCE_MEM, 44 .start = ei->addr, 45 .end = ei->addr + ei->size - 1, 46 }; 47 register_pmem_device(&res); 48 } 49 } 50 51 return 0; 52 } 53 device_initcall(register_pmem_devices); 54