1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Code commons to all DaVinci SoCs. 4 * 5 * Author: Mark A. Greer <mgreer@mvista.com> 6 * 7 * 2009 (c) MontaVista Software, Inc. 8 */ 9 #include <linux/module.h> 10 #include <linux/io.h> 11 #include <linux/etherdevice.h> 12 #include <linux/davinci_emac.h> 13 #include <linux/dma-mapping.h> 14 15 #include <asm/tlb.h> 16 #include <asm/mach/map.h> 17 18 #include "common.h" 19 #include "cputype.h" 20 21 struct davinci_soc_info davinci_soc_info; 22 EXPORT_SYMBOL(davinci_soc_info); 23 24 static int __init davinci_init_id(struct davinci_soc_info *soc_info) 25 { 26 int i; 27 struct davinci_id *dip; 28 u8 variant; 29 u16 part_no; 30 void __iomem *base; 31 32 base = ioremap(soc_info->jtag_id_reg, SZ_4K); 33 if (!base) { 34 pr_err("Unable to map JTAG ID register\n"); 35 return -ENOMEM; 36 } 37 38 soc_info->jtag_id = __raw_readl(base); 39 iounmap(base); 40 41 variant = (soc_info->jtag_id & 0xf0000000) >> 28; 42 part_no = (soc_info->jtag_id & 0x0ffff000) >> 12; 43 44 for (i = 0, dip = soc_info->ids; i < soc_info->ids_num; 45 i++, dip++) 46 /* Don't care about the manufacturer right now */ 47 if ((dip->part_no == part_no) && (dip->variant == variant)) { 48 soc_info->cpu_id = dip->cpu_id; 49 pr_info("DaVinci %s variant 0x%x\n", dip->name, 50 dip->variant); 51 return 0; 52 } 53 54 pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id); 55 return -EINVAL; 56 } 57 58 void __init davinci_common_init(const struct davinci_soc_info *soc_info) 59 { 60 int ret; 61 62 if (!soc_info) { 63 ret = -EINVAL; 64 goto err; 65 } 66 67 memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info)); 68 69 if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0)) 70 iotable_init(davinci_soc_info.io_desc, 71 davinci_soc_info.io_desc_num); 72 73 /* 74 * Normally devicemaps_init() would flush caches and tlb after 75 * mdesc->map_io(), but we must also do it here because of the CPU 76 * revision check below. 77 */ 78 local_flush_tlb_all(); 79 flush_cache_all(); 80 81 /* 82 * We want to check CPU revision early for cpu_is_xxxx() macros. 83 * IO space mapping must be initialized before we can do that. 84 */ 85 ret = davinci_init_id(&davinci_soc_info); 86 if (ret < 0) 87 goto err; 88 89 90 return; 91 92 err: 93 panic("davinci_common_init: SoC Initialization failed\n"); 94 } 95 96 void __init davinci_init_late(void) 97 { 98 davinci_cpufreq_init(); 99 } 100