diff options
Diffstat (limited to 'kernel/arch/arm/mach-mvebu/system-controller.c')
| -rw-r--r-- | kernel/arch/arm/mach-mvebu/system-controller.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-mvebu/system-controller.c b/kernel/arch/arm/mach-mvebu/system-controller.c new file mode 100644 index 000000000..c6c132acd --- /dev/null +++ b/kernel/arch/arm/mach-mvebu/system-controller.c @@ -0,0 +1,180 @@ +/* + * 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) +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(virt_to_phys(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); |