82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
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* Copyright (C) 2013
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <io.h>
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#include <of.h>
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#include <of_address.h>
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#include <linux/clk.h>
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/*
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* Marvell MVEBU SoC id and revision can be read from any PCIe
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* controller port.
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*/
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u16 soc_devid;
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EXPORT_SYMBOL(soc_devid);
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u16 soc_revid;
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EXPORT_SYMBOL(soc_revid);
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static const struct of_device_id mvebu_pcie_of_ids[] = {
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{ .compatible = "marvell,armada-xp-pcie", },
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{ .compatible = "marvell,armada-370-pcie", },
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{ .compatible = "marvell,dove-pcie" },
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{ .compatible = "marvell,kirkwood-pcie" },
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{ },
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};
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#define PCIE_VEN_DEV_ID 0x000
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#define PCIE_REV_ID 0x008
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#define REV_ID_MASK 0xff
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static int mvebu_soc_id_init(void)
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{
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struct device_node *np, *cnp;
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struct clk *clk;
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void __iomem *base;
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np = of_find_matching_node(NULL, mvebu_pcie_of_ids);
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if (!np)
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return -ENODEV;
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for_each_child_of_node(np, cnp) {
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base = of_iomap(cnp, 0);
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if (!base)
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continue;
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clk = of_clk_get(cnp, 0);
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if (IS_ERR(clk))
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continue;
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clk_enable(clk);
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soc_devid = readl(base + PCIE_VEN_DEV_ID) >> 16;
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soc_revid = readl(base + PCIE_REV_ID) & REV_ID_MASK;
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clk_disable(clk);
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break;
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}
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if (!soc_devid) {
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pr_err("Unable to read SoC id from PCIe ports\n");
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return -EINVAL;
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}
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pr_info("SoC: Marvell %04x rev %d\n", soc_devid, soc_revid);
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return 0;
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}
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postcore_initcall(mvebu_soc_id_init);
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