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 #include <linux/platform_data/davinci-cpufreq.h> 15 16 #include <asm/tlb.h> 17 #include <asm/mach/map.h> 18 19 #include "common.h" 20 #include "cputype.h" 21 22 struct davinci_soc_info davinci_soc_info; 23 EXPORT_SYMBOL(davinci_soc_info); 24 25 static int __init davinci_init_id(struct davinci_soc_info *soc_info) 26 { 27 int i; 28 struct davinci_id *dip; 29 u8 variant; 30 u16 part_no; 31 void __iomem *base; 32 33 base = ioremap(soc_info->jtag_id_reg, SZ_4K); 34 if (!base) { 35 pr_err("Unable to map JTAG ID register\n"); 36 return -ENOMEM; 37 } 38 39 soc_info->jtag_id = __raw_readl(base); 40 iounmap(base); 41 42 variant = (soc_info->jtag_id & 0xf0000000) >> 28; 43 part_no = (soc_info->jtag_id & 0x0ffff000) >> 12; 44 45 for (i = 0, dip = soc_info->ids; i < soc_info->ids_num; 46 i++, dip++) 47 /* Don't care about the manufacturer right now */ 48 if ((dip->part_no == part_no) && (dip->variant == variant)) { 49 soc_info->cpu_id = dip->cpu_id; 50 pr_info("DaVinci %s variant 0x%x\n", dip->name, 51 dip->variant); 52 return 0; 53 } 54 55 pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id); 56 return -EINVAL; 57 } 58 59 void __init davinci_common_init(const struct davinci_soc_info *soc_info) 60 { 61 int ret; 62 63 if (!soc_info) { 64 ret = -EINVAL; 65 goto err; 66 } 67 68 memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info)); 69 70 if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0)) 71 iotable_init(davinci_soc_info.io_desc, 72 davinci_soc_info.io_desc_num); 73 74 /* 75 * Normally devicemaps_init() would flush caches and tlb after 76 * mdesc->map_io(), but we must also do it here because of the CPU 77 * revision check below. 78 */ 79 local_flush_tlb_all(); 80 flush_cache_all(); 81 82 /* 83 * We want to check CPU revision early for cpu_is_xxxx() macros. 84 * IO space mapping must be initialized before we can do that. 85 */ 86 ret = davinci_init_id(&davinci_soc_info); 87 if (ret < 0) 88 goto err; 89 90 91 return; 92 93 err: 94 panic("davinci_common_init: SoC Initialization failed\n"); 95 } 96 97 void __init davinci_init_late(void) 98 { 99 davinci_cpufreq_init(); 100 } 101