The A80 is a big.LITTLE SoC with 1 cluster of 4 Cortex-A7s and 1 cluster of 4 Cortex-A15s.
This patch adds support to bring up the second cluster and thus all cores using the common MCPM code. Core/cluster power down has not been implemented, thus CPU hotplugging and big.LITTLE switcher is not supported. Signed-off-by: Chen-Yu Tsai <w...@csie.org> --- arch/arm/mach-sunxi/Kconfig | 8 + arch/arm/mach-sunxi/Makefile | 1 + arch/arm/mach-sunxi/mcpm.c | 370 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 379 insertions(+) create mode 100644 arch/arm/mach-sunxi/mcpm.c diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig index 81502b90dd91..8c596cfb4039 100644 --- a/arch/arm/mach-sunxi/Kconfig +++ b/arch/arm/mach-sunxi/Kconfig @@ -45,4 +45,12 @@ config MACH_SUN9I default ARCH_SUNXI select ARM_GIC +config SUN9I_A80_MCPM + bool "Allwinner A80 Multi-Cluster PM support" + depends on MCPM && MACH_SUN9I + select ARM_CCI400_PORT_CTRL + help + This is needed to provide CPU and cluster power management + on Allwinner A80 implementing big.LITTLE. + endif diff --git a/arch/arm/mach-sunxi/Makefile b/arch/arm/mach-sunxi/Makefile index 27b168f121a1..e8558912c714 100644 --- a/arch/arm/mach-sunxi/Makefile +++ b/arch/arm/mach-sunxi/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_ARCH_SUNXI) += sunxi.o obj-$(CONFIG_SMP) += platsmp.o +obj-$(CONFIG_SUN9I_A80_MCPM) += mcpm.o diff --git a/arch/arm/mach-sunxi/mcpm.c b/arch/arm/mach-sunxi/mcpm.c new file mode 100644 index 000000000000..cf9cbf268d29 --- /dev/null +++ b/arch/arm/mach-sunxi/mcpm.c @@ -0,0 +1,370 @@ +/* + * Copyright (c) 2015 Chen-Yu Tsai + * + * Chen-Yu Tsai <w...@csie.org> + * + * arch/arm/mach-sunxi/mcpm.c + * + * Based on arch/arm/mach-exynos/mcpm-exynos.c and Allwinner code + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/arm-cci.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/of_address.h> + +#include <asm/cputype.h> +#include <asm/cp15.h> +#include <asm/mcpm.h> + +#define SUNXI_CPUS_PER_CLUSTER 4 +#define SUNXI_NR_CLUSTERS 2 + +#define SUN9I_A80_A15_CLUSTER 1 + +#define CPUCFG_CX_CTRL_REG0(c) (0x10 * (c)) +#define CPUCFG_CX_CTRL_REG0_L1_RST_DISABLE(n) BIT(n) +#define CPUCFG_CX_CTRL_REG0_L1_RST_DISABLE_ALL 0xf +#define CPUCFG_CX_CTRL_REG0_L2_RST_DISABLE_A7 BIT(4) +#define CPUCFG_CX_CTRL_REG0_L2_RST_DISABLE_A15 BIT(0) +#define CPUCFG_CX_CTRL_REG1(c) (0x10 * (c) + 0x4) +#define CPUCFG_CX_CTRL_REG1_ACINACTM BIT(0) +#define CPUCFG_CX_RST_CTRL(c) (0x80 + 0x4 * (c)) +#define CPUCFG_CX_RST_CTRL_DBG_SOC_RST BIT(24) +#define CPUCFG_CX_RST_CTRL_ETM_RST(n) BIT(20 + (n)) +#define CPUCFG_CX_RST_CTRL_ETM_RST_ALL (0xf << 20) +#define CPUCFG_CX_RST_CTRL_DBG_RST(n) BIT(16 + (n)) +#define CPUCFG_CX_RST_CTRL_DBG_RST_ALL (0xf << 16) +#define CPUCFG_CX_RST_CTRL_H_RST BIT(12) +#define CPUCFG_CX_RST_CTRL_L2_RST BIT(8) +#define CPUCFG_CX_RST_CTRL_CX_RST(n) BIT(4 + (n)) +#define CPUCFG_CX_RST_CTRL_CORE_RST(n) BIT(n) + +#define PRCM_CPU_PO_RST_CTRL(c) (0x4 + 0x4 * (c)) +#define PRCM_CPU_PO_RST_CTRL_CORE(n) BIT(n) +#define PRCM_CPU_PO_RST_CTRL_CORE_ALL 0xf +#define PRCM_PWROFF_GATING_REG(c) (0x100 + 0x4 * (c)) +#define PRCM_PWROFF_GATING_REG_CLUSTER BIT(4) +#define PRCM_PWROFF_GATING_REG_CORE(n) BIT(n) +#define PRCM_PWR_SWITCH_REG(c, cpu) (0x140 + 0x10 * (c) + 0x4 * (cpu)) +#define PRCM_CPU_SOFT_ENTRY_REG 0x164 + +static void __iomem *cpucfg_base; +static void __iomem *prcm_base; + +static int sunxi_cpu_power_switch_set(unsigned int cpu, unsigned int cluster, + bool enable) +{ + u32 reg; + + /* control sequence from Allwinner A80 user manual v1.2 PRCM section */ + reg = readl(prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + if (enable) { + if (reg == 0x00) { + pr_debug("power clamp for cluster %u cpu %u already open", + cluster, cpu); + return 0; + } + + writel(0xff, prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + udelay(10); + writel(0xfe, prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + udelay(10); + writel(0xf8, prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + udelay(10); + writel(0xf0, prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + udelay(10); + writel(0x00, prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + udelay(10); + } else { + writel(0xff, prcm_base + PRCM_PWR_SWITCH_REG(cluster, cpu)); + udelay(10); + } + + return 0; +} + +static int sunxi_cpu_powerup(unsigned int cpu, unsigned int cluster) +{ + u32 reg; + + pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster); + if (cpu >= SUNXI_CPUS_PER_CLUSTER || cluster >= SUNXI_NR_CLUSTERS) + return -EINVAL; + + /* assert processor power-on reset */ + reg = readl(prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + reg &= ~PRCM_CPU_PO_RST_CTRL_CORE(cpu); + writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + + /* Cortex-A7: hold L1 reset disable signal low */ + if (!(of_machine_is_compatible("allwinner,sun9i-a80") && + cluster == SUN9I_A80_A15_CLUSTER)) { + reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG0(cluster)); + reg &= ~CPUCFG_CX_CTRL_REG0_L1_RST_DISABLE(cpu); + writel(reg, cpucfg_base + CPUCFG_CX_CTRL_REG0(cluster)); + } + + /* assert processor related resets */ + reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + reg &= ~CPUCFG_CX_RST_CTRL_DBG_RST(cpu); + + /* + * Allwinner code also asserts resets for NEON on A15. According + * to ARM manuals, asserting power-on reset is sufficient. + */ + if (!(of_machine_is_compatible("allwinner,sun9i-a80") && + cluster == SUN9I_A80_A15_CLUSTER)) { + reg &= ~CPUCFG_CX_RST_CTRL_ETM_RST(cpu); + } + writel(reg, cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + + /* open power switch */ + sunxi_cpu_power_switch_set(cpu, cluster, true); + + /* clear processor power gate */ + reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster)); + reg &= ~PRCM_PWROFF_GATING_REG_CORE(cpu); + writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster)); + udelay(20); + + /* de-assert processor power-on reset */ + reg = readl(prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + reg |= PRCM_CPU_PO_RST_CTRL_CORE(cpu); + writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + + /* de-assert all processor resets */ + reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + reg |= CPUCFG_CX_RST_CTRL_DBG_RST(cpu); + reg |= CPUCFG_CX_RST_CTRL_CORE_RST(cpu); + if (!(of_machine_is_compatible("allwinner,sun9i-a80") && + cluster == SUN9I_A80_A15_CLUSTER)) { + reg |= CPUCFG_CX_RST_CTRL_ETM_RST(cpu); + } else { + reg |= CPUCFG_CX_RST_CTRL_CX_RST(cpu); /* NEON */ + } + writel(reg, cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + + return 0; +} + +static int sunxi_cluster_powerup(unsigned int cluster) +{ + u32 reg; + + pr_debug("%s: cluster %u\n", __func__, cluster); + if (cluster >= SUNXI_NR_CLUSTERS) + return -EINVAL; + + /* assert ACINACTM */ + reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG1(cluster)); + reg |= CPUCFG_CX_CTRL_REG1_ACINACTM; + writel(reg, cpucfg_base + CPUCFG_CX_CTRL_REG1(cluster)); + + /* assert cluster processor power-on resets */ + reg = readl(prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + reg &= ~PRCM_CPU_PO_RST_CTRL_CORE_ALL; + writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + + /* assert cluster resets */ + reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + reg &= ~CPUCFG_CX_RST_CTRL_DBG_SOC_RST; + reg &= ~CPUCFG_CX_RST_CTRL_DBG_RST_ALL; + reg &= ~CPUCFG_CX_RST_CTRL_H_RST; + reg &= ~CPUCFG_CX_RST_CTRL_L2_RST; + + /* + * Allwinner code also asserts resets for NEON on A15. According + * to ARM manuals, asserting power-on reset is sufficient. + */ + if (!(of_machine_is_compatible("allwinner,sun9i-a80") && + cluster == SUN9I_A80_A15_CLUSTER)) { + reg &= ~CPUCFG_CX_RST_CTRL_ETM_RST_ALL; + } + writel(reg, cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + + /* hold L1/L2 reset disable signals low */ + reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG0(cluster)); + if (of_machine_is_compatible("allwinner,sun9i-a80") && + cluster == SUN9I_A80_A15_CLUSTER) { + /* Cortex-A15: hold L2RSTDISABLE low */ + reg &= ~CPUCFG_CX_CTRL_REG0_L2_RST_DISABLE_A15; + } else { + /* Cortex-A7: hold L1RSTDISABLE and L2RSTDISABLE low */ + reg &= ~CPUCFG_CX_CTRL_REG0_L1_RST_DISABLE_ALL; + reg &= ~CPUCFG_CX_CTRL_REG0_L2_RST_DISABLE_A7; + } + writel(reg, cpucfg_base + CPUCFG_CX_CTRL_REG0(cluster)); + + /* clear cluster power gate */ + reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster)); + reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER; + writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster)); + udelay(20); + + /* de-assert cluster resets */ + reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + reg |= CPUCFG_CX_RST_CTRL_DBG_SOC_RST; + reg |= CPUCFG_CX_RST_CTRL_H_RST; + reg |= CPUCFG_CX_RST_CTRL_L2_RST; + writel(reg, cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + + /* de-assert ACINACTM */ + reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG1(cluster)); + reg &= ~CPUCFG_CX_CTRL_REG1_ACINACTM; + writel(reg, cpucfg_base + CPUCFG_CX_CTRL_REG1(cluster)); + + return 0; +} + +static void sunxi_cpu_cache_disable(void) +{ + /* Disable and flush the local CPU cache. */ + v7_exit_coherency_flush(louis); +} + +static void sunxi_cluster_cache_disable(void) +{ + if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A15) { + /* + * On the Cortex-A15 we need to disable + * L2 prefetching before flushing the cache. + */ + asm volatile( + "mcr p15, 1, %0, c15, c0, 3\n" + "isb\n" + "dsb" + : : "r" (0x400)); + } + + /* Flush all cache levels for this cluster. */ + v7_exit_coherency_flush(all); + + /* Are we supposed to wait for STANDBYWFIL2? */ + + /* + * 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 sunxi_power_ops = { + .cpu_powerup = sunxi_cpu_powerup, + .cluster_powerup = sunxi_cluster_powerup, + .cpu_cache_disable = sunxi_cpu_cache_disable, + .cluster_cache_disable = sunxi_cluster_cache_disable, +}; + +/* + * Enable cluster-level coherency, in preparation for turning on the MMU. + * + * Also enable regional clock gating and L2 data latency settings for + * Cortex-A15. + */ +static void __naked sunxi_power_up_setup(unsigned int affinity_level) +{ + asm volatile ( + "mrc p15, 0, r1, c0, c0, 0\n" + "movw r2, #" __stringify(ARM_CPU_PART_MASK & 0xffff) "\n" + "movt r2, #" __stringify(ARM_CPU_PART_MASK >> 16) "\n" + "and r1, r1, r2\n" + "movw r2, #" __stringify(ARM_CPU_PART_CORTEX_A15 & 0xffff) "\n" + "movt r2, #" __stringify(ARM_CPU_PART_CORTEX_A15 >> 16) "\n" + "cmp r1, r2\n" + "bne not_a15\n" + + /* L2CTRL: Enable CPU regional clock gates */ + "mrc p15, 1, r1, c15, c0, 4\n" + "orr r1, r1, #(0x1<<31)\n" + "mcr p15, 1, r1, c15, c0, 4\n" + + /* L2ACTLR */ + "mrc p15, 1, r1, c15, c0, 0\n" + /* Enable L2, GIC, and Timer regional clock gates */ + "orr r1, r1, #(0x1<<26)\n" + /* Disable clean/evict from being pushed to external */ + "orr r1, r1, #(0x1<<3)\n" + "mcr p15, 1, r1, c15, c0, 0\n" + + /* L2 data RAM latency */ + "mrc p15, 1, r1, c9, c0, 2\n" + "bic r1, r1, #(0x7<<0)\n" + "orr r1, r1, #(0x3<<0)\n" + "mcr p15, 1, r1, c9, c0, 2\n" + "not_a15:\n" + + "cmp r0, #1\n" + "bxne lr\n" + "b cci_enable_port_for_self" + ); +} + +static void sunxi_mcpm_setup_entry_point(void) +{ + __raw_writel(virt_to_phys(mcpm_entry_point), + prcm_base + PRCM_CPU_SOFT_ENTRY_REG); +} + +static int __init sunxi_mcpm_init(void) +{ + struct device_node *node; + int ret; + + if (!of_machine_is_compatible("allwinner,sun9i-a80")) + return -ENODEV; + + if (!cci_probed()) + return -ENODEV; + + node = of_find_compatible_node(NULL, NULL, + "allwinner,sun9i-a80-cpucfg"); + if (!node) + return -ENODEV; + + cpucfg_base = of_iomap(node, 0); + of_node_put(node); + if (!cpucfg_base) { + pr_err("%s: failed to map CPUCFG registers\n", __func__); + return -ENOMEM; + } + + node = of_find_compatible_node(NULL, NULL, + "allwinner,sun9i-a80-prcm"); + if (!node) + return -ENODEV; + + prcm_base = of_iomap(node, 0); + of_node_put(node); + if (!prcm_base) { + pr_err("%s: failed to map PRCM registers\n", __func__); + iounmap(prcm_base); + return -ENOMEM; + } + + ret = mcpm_platform_register(&sunxi_power_ops); + if (!ret) + ret = mcpm_sync_init(sunxi_power_up_setup); + /* turn on the CCI */ + if (!ret) + ret = mcpm_loopback(sunxi_cluster_cache_disable); + if (ret) { + iounmap(cpucfg_base); + iounmap(prcm_base); + return ret; + } + + mcpm_smp_set_ops(); + + pr_info("sunxi MCPM support installed\n"); + + sunxi_mcpm_setup_entry_point(); + + return ret; +} + +early_initcall(sunxi_mcpm_init); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/