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/*
* System controller support for Armada 370, 375 and XP platforms.
*
* Copyright (C) 2012 Marvell
*
* Lior Amsalem <alior@marvell.com>
* Gregory CLEMENT <gregory.clement@free-electrons.com>
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*
* The Armada 370, 375 and Armada XP SoCs have a range of
* miscellaneous registers, that do not belong to a particular device,
* but rather provide system-level features. This basic
* system-controller driver provides a device tree binding for those
* registers, and implements utility functions offering various
* features related to those registers.
*
* For now, the feature set is limited to restarting the platform by a
* soft-reset, but it might be extended in the future.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/reboot.h>
#include "common.h"
#include "mvebu-soc-id.h"
#include "pmsu.h"
#define ARMADA_375_CRYPT0_ENG_TARGET 41
#define ARMADA_375_CRYPT0_ENG_ATTR 1
static void __iomem *system_controller_base;
static phys_addr_t system_controller_phys_base;
struct mvebu_system_controller {
u32 rstoutn_mask_offset;
u32 system_soft_reset_offset;
u32 rstoutn_mask_reset_out_en;
u32 system_soft_reset;
u32 resume_boot_addr;
u32 dev_id;
u32 rev_id;
};
static struct mvebu_system_controller *mvebu_sc;
static const struct mvebu_system_controller armada_370_xp_system_controller = {
.rstoutn_mask_offset = 0x60,
.system_soft_reset_offset = 0x64,
.rstoutn_mask_reset_out_en = 0x1,
.system_soft_reset = 0x1,
.dev_id = 0x38,
.rev_id = 0x3c,
};
static const struct mvebu_system_controller armada_375_system_controller = {
.rstoutn_mask_offset = 0x54,
.system_soft_reset_offset = 0x58,
.rstoutn_mask_reset_out_en = 0x1,
.system_soft_reset = 0x1,
.resume_boot_addr = 0xd4,
.dev_id = 0x38,
.rev_id = 0x3c,
};
static const struct mvebu_system_controller orion_system_controller = {
.rstoutn_mask_offset = 0x108,
.system_soft_reset_offset = 0x10c,
.rstoutn_mask_reset_out_en = 0x4,
.system_soft_reset = 0x1,
};
static const struct of_device_id of_system_controller_table[] = {
{
.compatible = "marvell,orion-system-controller",
.data = (void *) &orion_system_controller,
}, {
.compatible = "marvell,armada-370-xp-system-controller",
.data = (void *) &armada_370_xp_system_controller,
}, {
.compatible = "marvell,armada-375-system-controller",
.data = (void *) &armada_375_system_controller,
},
{ /* end of list */ },
};
void mvebu_restart(enum reboot_mode mode, const char *cmd)
{
if (!system_controller_base) {
pr_err("Cannot restart, system-controller not available: check the device tree\n");
} else {
/*
* Enable soft reset to assert RSTOUTn.
*/
writel(mvebu_sc->rstoutn_mask_reset_out_en,
system_controller_base +
mvebu_sc->rstoutn_mask_offset);
/*
* Assert soft reset.
*/
writel(mvebu_sc->system_soft_reset,
system_controller_base +
mvebu_sc->system_soft_reset_offset);
}
while (1)
;
}
int mvebu_system_controller_get_soc_id(u32 *dev, u32 *rev)
{
if (of_machine_is_compatible("marvell,armada380") &&
system_controller_base) {
*dev = readl(system_controller_base + mvebu_sc->dev_id) >> 16;
*rev = (readl(system_controller_base + mvebu_sc->rev_id) >> 8)
& 0xF;
return 0;
} else
return -ENODEV;
}
#if defined(CONFIG_SMP) && defined(CONFIG_MACH_MVEBU_V7)
static void mvebu_armada375_smp_wa_init(void)
{
u32 dev, rev;
phys_addr_t resume_addr_reg;
if (mvebu_get_soc_id(&dev, &rev) != 0)
return;
if (rev != ARMADA_375_Z1_REV)
return;
resume_addr_reg = system_controller_phys_base +
mvebu_sc->resume_boot_addr;
mvebu_setup_boot_addr_wa(ARMADA_375_CRYPT0_ENG_TARGET,
ARMADA_375_CRYPT0_ENG_ATTR,
resume_addr_reg);
}
void mvebu_system_controller_set_cpu_boot_addr(void *boot_addr)
{
BUG_ON(system_controller_base == NULL);
BUG_ON(mvebu_sc->resume_boot_addr == 0);
if (of_machine_is_compatible("marvell,armada375"))
mvebu_armada375_smp_wa_init();
writel(__pa_symbol(boot_addr), system_controller_base +
mvebu_sc->resume_boot_addr);
}
#endif
static int __init mvebu_system_controller_init(void)
{
const struct of_device_id *match;
struct device_node *np;
np = of_find_matching_node_and_match(NULL, of_system_controller_table,
&match);
if (np) {
struct resource res;
system_controller_base = of_iomap(np, 0);
of_address_to_resource(np, 0, &res);
system_controller_phys_base = res.start;
mvebu_sc = (struct mvebu_system_controller *)match->data;
of_node_put(np);
}
return 0;
}
early_initcall(mvebu_system_controller_init);
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