1 /* 2 * Code commons to all DaVinci SoCs. 3 * 4 * Author: Mark A. Greer <mgreer@mvista.com> 5 * 6 * 2009 (c) MontaVista Software, Inc. This file is licensed under 7 * the terms of the GNU General Public License version 2. This program 8 * is licensed "as is" without any warranty of any kind, whether express 9 * or implied. 10 */ 11 #include <linux/module.h> 12 #include <linux/io.h> 13 14 #include <asm/tlb.h> 15 #include <asm/mach/map.h> 16 17 #include <mach/common.h> 18 #include <mach/cputype.h> 19 20 struct davinci_soc_info davinci_soc_info; 21 EXPORT_SYMBOL(davinci_soc_info); 22 23 static struct davinci_id * __init davinci_get_id(u32 jtag_id) 24 { 25 int i; 26 struct davinci_id *dip; 27 u8 variant = (jtag_id & 0xf0000000) >> 28; 28 u16 part_no = (jtag_id & 0x0ffff000) >> 12; 29 30 for (i = 0, dip = davinci_soc_info.ids; i < davinci_soc_info.ids_num; 31 i++, dip++) 32 /* Don't care about the manufacturer right now */ 33 if ((dip->part_no == part_no) && (dip->variant == variant)) 34 return dip; 35 36 return NULL; 37 } 38 39 void __init davinci_common_init(struct davinci_soc_info *soc_info) 40 { 41 int ret; 42 struct davinci_id *dip; 43 44 if (!soc_info) { 45 ret = -EINVAL; 46 goto err; 47 } 48 49 memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info)); 50 51 if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0)) 52 iotable_init(davinci_soc_info.io_desc, 53 davinci_soc_info.io_desc_num); 54 55 /* 56 * Normally devicemaps_init() would flush caches and tlb after 57 * mdesc->map_io(), but we must also do it here because of the CPU 58 * revision check below. 59 */ 60 local_flush_tlb_all(); 61 flush_cache_all(); 62 63 /* 64 * We want to check CPU revision early for cpu_is_xxxx() macros. 65 * IO space mapping must be initialized before we can do that. 66 */ 67 davinci_soc_info.jtag_id = __raw_readl(davinci_soc_info.jtag_id_base); 68 69 dip = davinci_get_id(davinci_soc_info.jtag_id); 70 if (!dip) { 71 ret = -EINVAL; 72 goto err; 73 } 74 75 davinci_soc_info.cpu_id = dip->cpu_id; 76 pr_info("DaVinci %s variant 0x%x\n", dip->name, dip->variant); 77 78 return; 79 80 err: 81 pr_err("davinci_common_init: SoC Initialization failed\n"); 82 } 83