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 #include "clock.h" 21 22 struct davinci_soc_info davinci_soc_info; 23 EXPORT_SYMBOL(davinci_soc_info); 24 25 static struct davinci_id * __init davinci_get_id(u32 jtag_id) 26 { 27 int i; 28 struct davinci_id *dip; 29 u8 variant = (jtag_id & 0xf0000000) >> 28; 30 u16 part_no = (jtag_id & 0x0ffff000) >> 12; 31 32 for (i = 0, dip = davinci_soc_info.ids; i < davinci_soc_info.ids_num; 33 i++, dip++) 34 /* Don't care about the manufacturer right now */ 35 if ((dip->part_no == part_no) && (dip->variant == variant)) 36 return dip; 37 38 return NULL; 39 } 40 41 void __init davinci_common_init(struct davinci_soc_info *soc_info) 42 { 43 int ret; 44 struct davinci_id *dip; 45 46 if (!soc_info) { 47 ret = -EINVAL; 48 goto err; 49 } 50 51 memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info)); 52 53 if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0)) 54 iotable_init(davinci_soc_info.io_desc, 55 davinci_soc_info.io_desc_num); 56 57 /* 58 * Normally devicemaps_init() would flush caches and tlb after 59 * mdesc->map_io(), but we must also do it here because of the CPU 60 * revision check below. 61 */ 62 local_flush_tlb_all(); 63 flush_cache_all(); 64 65 /* 66 * We want to check CPU revision early for cpu_is_xxxx() macros. 67 * IO space mapping must be initialized before we can do that. 68 */ 69 davinci_soc_info.jtag_id = __raw_readl(davinci_soc_info.jtag_id_base); 70 71 dip = davinci_get_id(davinci_soc_info.jtag_id); 72 if (!dip) { 73 ret = -EINVAL; 74 goto err; 75 } 76 77 davinci_soc_info.cpu_id = dip->cpu_id; 78 pr_info("DaVinci %s variant 0x%x\n", dip->name, dip->variant); 79 80 if (davinci_soc_info.cpu_clks) { 81 ret = davinci_clk_init(davinci_soc_info.cpu_clks); 82 83 if (ret != 0) 84 goto err; 85 } 86 87 return; 88 89 err: 90 pr_err("davinci_common_init: SoC Initialization failed\n"); 91 } 92