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 #include <linux/etherdevice.h> 14 #include <linux/davinci_emac.h> 15 #include <linux/dma-mapping.h> 16 17 #include <asm/tlb.h> 18 #include <asm/mach/map.h> 19 20 #include <mach/common.h> 21 #include <mach/cputype.h> 22 23 struct davinci_soc_info davinci_soc_info; 24 EXPORT_SYMBOL(davinci_soc_info); 25 26 void __iomem *davinci_intc_base; 27 int davinci_intc_type; 28 29 static int __init davinci_init_id(struct davinci_soc_info *soc_info) 30 { 31 int i; 32 struct davinci_id *dip; 33 u8 variant; 34 u16 part_no; 35 void __iomem *base; 36 37 base = ioremap(soc_info->jtag_id_reg, SZ_4K); 38 if (!base) { 39 pr_err("Unable to map JTAG ID register\n"); 40 return -ENOMEM; 41 } 42 43 soc_info->jtag_id = __raw_readl(base); 44 iounmap(base); 45 46 variant = (soc_info->jtag_id & 0xf0000000) >> 28; 47 part_no = (soc_info->jtag_id & 0x0ffff000) >> 12; 48 49 for (i = 0, dip = soc_info->ids; i < soc_info->ids_num; 50 i++, dip++) 51 /* Don't care about the manufacturer right now */ 52 if ((dip->part_no == part_no) && (dip->variant == variant)) { 53 soc_info->cpu_id = dip->cpu_id; 54 pr_info("DaVinci %s variant 0x%x\n", dip->name, 55 dip->variant); 56 return 0; 57 } 58 59 pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id); 60 return -EINVAL; 61 } 62 63 void __init davinci_common_init(const struct davinci_soc_info *soc_info) 64 { 65 int ret; 66 67 if (!soc_info) { 68 ret = -EINVAL; 69 goto err; 70 } 71 72 memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info)); 73 74 if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0)) 75 iotable_init(davinci_soc_info.io_desc, 76 davinci_soc_info.io_desc_num); 77 78 /* 79 * Normally devicemaps_init() would flush caches and tlb after 80 * mdesc->map_io(), but we must also do it here because of the CPU 81 * revision check below. 82 */ 83 local_flush_tlb_all(); 84 flush_cache_all(); 85 86 /* 87 * We want to check CPU revision early for cpu_is_xxxx() macros. 88 * IO space mapping must be initialized before we can do that. 89 */ 90 ret = davinci_init_id(&davinci_soc_info); 91 if (ret < 0) 92 goto err; 93 94 95 return; 96 97 err: 98 panic("davinci_common_init: SoC Initialization failed\n"); 99 } 100 101 void __init davinci_init_late(void) 102 { 103 davinci_cpufreq_init(); 104 } 105