forked from Minki/linux
69872e93d9
This patch makes it easier to identify SoC init failures by panicing when SoC init fails. Without successful SoC init, the kernel eventually fails when attempt is made to access the clocks. Also, an error is printed when JTAG ID match fails to make it easier to identify failures due to SoC rev changes. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
111 lines
2.7 KiB
C
111 lines
2.7 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 <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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#include <mach/emac.h>
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#include "clock.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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void __iomem *davinci_intc_base;
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int davinci_intc_type;
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void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context)
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{
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char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
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off_t offset = (off_t)context;
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/* Read MAC addr from EEPROM */
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if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
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pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
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}
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static struct davinci_id * __init davinci_get_id(u32 jtag_id)
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{
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int i;
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struct davinci_id *dip;
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u8 variant = (jtag_id & 0xf0000000) >> 28;
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u16 part_no = (jtag_id & 0x0ffff000) >> 12;
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for (i = 0, dip = davinci_soc_info.ids; i < davinci_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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return dip;
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return NULL;
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}
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void __init davinci_common_init(struct davinci_soc_info *soc_info)
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{
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int ret;
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struct davinci_id *dip;
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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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davinci_soc_info.jtag_id = __raw_readl(davinci_soc_info.jtag_id_base);
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dip = davinci_get_id(davinci_soc_info.jtag_id);
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if (!dip) {
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ret = -EINVAL;
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pr_err("Unknown DaVinci JTAG ID 0x%x\n",
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davinci_soc_info.jtag_id);
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goto err;
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}
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davinci_soc_info.cpu_id = dip->cpu_id;
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pr_info("DaVinci %s variant 0x%x\n", dip->name, dip->variant);
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if (davinci_soc_info.cpu_clks) {
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ret = davinci_clk_init(davinci_soc_info.cpu_clks);
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if (ret != 0)
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goto err;
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}
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davinci_intc_base = davinci_soc_info.intc_base;
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davinci_intc_type = davinci_soc_info.intc_type;
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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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