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