diff options
Diffstat (limited to 'arch/arm/mach-versatile/dcscb.c')
| -rw-r--r-- | arch/arm/mach-versatile/dcscb.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/arch/arm/mach-versatile/dcscb.c b/arch/arm/mach-versatile/dcscb.c deleted file mode 100644 index d8797350996d..000000000000 --- a/arch/arm/mach-versatile/dcscb.c +++ /dev/null @@ -1,173 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * dcscb.c - Dual Cluster System Configuration Block - * - * Created by: Nicolas Pitre, May 2012 - * Copyright: (C) 2012-2013 Linaro Limited - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/io.h> -#include <linux/errno.h> -#include <linux/of_address.h> -#include <linux/vexpress.h> -#include <linux/arm-cci.h> - -#include <asm/mcpm.h> -#include <asm/proc-fns.h> -#include <asm/cacheflush.h> -#include <asm/cputype.h> -#include <asm/cp15.h> - -#include "vexpress.h" - -#define RST_HOLD0 0x0 -#define RST_HOLD1 0x4 -#define SYS_SWRESET 0x8 -#define RST_STAT0 0xc -#define RST_STAT1 0x10 -#define EAG_CFG_R 0x20 -#define EAG_CFG_W 0x24 -#define KFC_CFG_R 0x28 -#define KFC_CFG_W 0x2c -#define DCS_CFG_R 0x30 - -static void __iomem *dcscb_base; -static int dcscb_allcpus_mask[2]; - -static int dcscb_cpu_powerup(unsigned int cpu, unsigned int cluster) -{ - unsigned int rst_hold, cpumask = (1 << cpu); - - pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster); - if (cluster >= 2 || !(cpumask & dcscb_allcpus_mask[cluster])) - return -EINVAL; - - rst_hold = readl_relaxed(dcscb_base + RST_HOLD0 + cluster * 4); - rst_hold &= ~(cpumask | (cpumask << 4)); - writel_relaxed(rst_hold, dcscb_base + RST_HOLD0 + cluster * 4); - return 0; -} - -static int dcscb_cluster_powerup(unsigned int cluster) -{ - unsigned int rst_hold; - - pr_debug("%s: cluster %u\n", __func__, cluster); - if (cluster >= 2) - return -EINVAL; - - /* remove cluster reset and add individual CPU's reset */ - rst_hold = readl_relaxed(dcscb_base + RST_HOLD0 + cluster * 4); - rst_hold &= ~(1 << 8); - rst_hold |= dcscb_allcpus_mask[cluster]; - writel_relaxed(rst_hold, dcscb_base + RST_HOLD0 + cluster * 4); - return 0; -} - -static void dcscb_cpu_powerdown_prepare(unsigned int cpu, unsigned int cluster) -{ - unsigned int rst_hold; - - pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster); - BUG_ON(cluster >= 2 || !((1 << cpu) & dcscb_allcpus_mask[cluster])); - - rst_hold = readl_relaxed(dcscb_base + RST_HOLD0 + cluster * 4); - rst_hold |= (1 << cpu); - writel_relaxed(rst_hold, dcscb_base + RST_HOLD0 + cluster * 4); -} - -static void dcscb_cluster_powerdown_prepare(unsigned int cluster) -{ - unsigned int rst_hold; - - pr_debug("%s: cluster %u\n", __func__, cluster); - BUG_ON(cluster >= 2); - - rst_hold = readl_relaxed(dcscb_base + RST_HOLD0 + cluster * 4); - rst_hold |= (1 << 8); - writel_relaxed(rst_hold, dcscb_base + RST_HOLD0 + cluster * 4); -} - -static void dcscb_cpu_cache_disable(void) -{ - /* Disable and flush the local CPU cache. */ - v7_exit_coherency_flush(louis); -} - -static void dcscb_cluster_cache_disable(void) -{ - /* Flush all cache levels for this cluster. */ - v7_exit_coherency_flush(all); - - /* - * A full outer cache flush could be needed at this point - * on platforms with such a cache, depending on where the - * outer cache sits. In some cases the notion of a "last - * cluster standing" would need to be implemented if the - * outer cache is shared across clusters. In any case, when - * the outer cache needs flushing, there is no concurrent - * access to the cache controller to worry about and no - * special locking besides what is already provided by the - * MCPM state machinery is needed. - */ - - /* - * Disable cluster-level coherency by masking - * incoming snoops and DVM messages: - */ - cci_disable_port_by_cpu(read_cpuid_mpidr()); -} - -static const struct mcpm_platform_ops dcscb_power_ops = { - .cpu_powerup = dcscb_cpu_powerup, - .cluster_powerup = dcscb_cluster_powerup, - .cpu_powerdown_prepare = dcscb_cpu_powerdown_prepare, - .cluster_powerdown_prepare = dcscb_cluster_powerdown_prepare, - .cpu_cache_disable = dcscb_cpu_cache_disable, - .cluster_cache_disable = dcscb_cluster_cache_disable, -}; - -extern void dcscb_power_up_setup(unsigned int affinity_level); - -static int __init dcscb_init(void) -{ - struct device_node *node; - unsigned int cfg; - int ret; - - if (!cci_probed()) - return -ENODEV; - - node = of_find_compatible_node(NULL, NULL, "arm,rtsm,dcscb"); - if (!node) - return -ENODEV; - dcscb_base = of_iomap(node, 0); - of_node_put(node); - if (!dcscb_base) - return -EADDRNOTAVAIL; - cfg = readl_relaxed(dcscb_base + DCS_CFG_R); - dcscb_allcpus_mask[0] = (1 << (((cfg >> 16) >> (0 << 2)) & 0xf)) - 1; - dcscb_allcpus_mask[1] = (1 << (((cfg >> 16) >> (1 << 2)) & 0xf)) - 1; - - ret = mcpm_platform_register(&dcscb_power_ops); - if (!ret) - ret = mcpm_sync_init(dcscb_power_up_setup); - if (ret) { - iounmap(dcscb_base); - return ret; - } - - pr_info("VExpress DCSCB support installed\n"); - - /* - * Future entries into the kernel can now go - * through the cluster entry vectors. - */ - vexpress_flags_set(__pa_symbol(mcpm_entry_point)); - - return 0; -} - -early_initcall(dcscb_init); |