102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* Code commons to all DaVinci SoCs.
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*
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* Author: Mark A. Greer <mgreer@mvista.com>
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*
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* 2009 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/etherdevice.h>
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#include <linux/davinci_emac.h>
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#include <linux/dma-mapping.h>
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#include <asm/tlb.h>
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#include <asm/mach/map.h>
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#include <mach/common.h>
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#include <mach/cputype.h>
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struct davinci_soc_info davinci_soc_info;
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EXPORT_SYMBOL(davinci_soc_info);
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static int __init davinci_init_id(struct davinci_soc_info *soc_info)
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{
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int i;
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struct davinci_id *dip;
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u8 variant;
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u16 part_no;
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void __iomem *base;
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base = ioremap(soc_info->jtag_id_reg, SZ_4K);
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if (!base) {
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pr_err("Unable to map JTAG ID register\n");
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return -ENOMEM;
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}
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soc_info->jtag_id = __raw_readl(base);
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iounmap(base);
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variant = (soc_info->jtag_id & 0xf0000000) >> 28;
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part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
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for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
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i++, dip++)
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/* Don't care about the manufacturer right now */
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if ((dip->part_no == part_no) && (dip->variant == variant)) {
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soc_info->cpu_id = dip->cpu_id;
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pr_info("DaVinci %s variant 0x%x\n", dip->name,
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dip->variant);
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return 0;
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}
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pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
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return -EINVAL;
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}
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void __init davinci_common_init(const struct davinci_soc_info *soc_info)
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{
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int ret;
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if (!soc_info) {
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ret = -EINVAL;
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goto err;
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}
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memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
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if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
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iotable_init(davinci_soc_info.io_desc,
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davinci_soc_info.io_desc_num);
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/*
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* Normally devicemaps_init() would flush caches and tlb after
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* mdesc->map_io(), but we must also do it here because of the CPU
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* revision check below.
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*/
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local_flush_tlb_all();
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flush_cache_all();
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/*
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* We want to check CPU revision early for cpu_is_xxxx() macros.
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* IO space mapping must be initialized before we can do that.
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*/
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ret = davinci_init_id(&davinci_soc_info);
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if (ret < 0)
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goto err;
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return;
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err:
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panic("davinci_common_init: SoC Initialization failed\n");
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}
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void __init davinci_init_late(void)
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{
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davinci_cpufreq_init();
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}
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