From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755044AbeDCGVL (ORCPT ); Tue, 3 Apr 2018 02:21:11 -0400 Received: from mail.bootlin.com ([62.4.15.54]:34678 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755024AbeDCGVJ (ORCPT ); Tue, 3 Apr 2018 02:21:09 -0400 From: =?UTF-8?q?Myl=C3=A8ne=20Josserand?= To: linux@armlinux.org.uk, maxime.ripard@bootlin.com, wens@csie.org, marc.zyngier@arm.com, mark.rutland@arm.com, robh+dt@kernel.org Cc: devicetree@vger.kernel.org, clabbe.montjoie@gmail.com, quentin.schulz@bootlin.com, thomas.petazzoni@bootlin.com, mylene.josserand@bootlin.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 12/13] ARM: sun8i: smp: Add support for A83T Date: Tue, 3 Apr 2018 08:18:35 +0200 Message-Id: <20180403061836.3926-13-mylene.josserand@bootlin.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180403061836.3926-1-mylene.josserand@bootlin.com> References: <20180403061836.3926-1-mylene.josserand@bootlin.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add the support for A83T. A83T SoC has an additional register than A80 to handle CPU configurations: R_CPUS_CFG. Information about the register comes from Allwinner's BSP driver. An important difference is the Power Off Gating register for clusters which is BIT(4) in case of SUN9I-A80 and BIT(0) in case of SUN8I-A83T. There is also a bit swap between sun8i-a83t and sun9i-a80 that must be handled. Signed-off-by: Mylène Josserand --- arch/arm/mach-sunxi/mc_smp.c | 120 +++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 117 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c index 468a6c46bfc9..72e497dc43ac 100644 --- a/arch/arm/mach-sunxi/mc_smp.c +++ b/arch/arm/mach-sunxi/mc_smp.c @@ -55,22 +55,31 @@ #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 CPUCFG_CX_RST_CTRL_CORE_RST_ALL (0xf << 0) #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)) +/* The power off register for clusters are different from a80 and a83t */ +#define PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I BIT(0) #define PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I 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 +/* R_CPUCFG registers, specific to SUN8I */ +#define R_CPUCFG_CLUSTER_PO_RST_CTRL(c) (0x30 + (c) * 0x4) +#define R_CPUCFG_CLUSTER_PO_RST_CTRL_CORE(n) BIT(n) +#define R_CPUCFG_CPU_SOFT_ENTRY_REG 0x01a4 + #define CPU0_SUPPORT_HOTPLUG_MAGIC0 0xFA50392F #define CPU0_SUPPORT_HOTPLUG_MAGIC1 0x790DCA3A static void __iomem *cpucfg_base; static void __iomem *prcm_base; static void __iomem *sram_b_smp_base; +static void __iomem *r_cpucfg_base; static int index; /* @@ -81,6 +90,7 @@ struct sunxi_mc_smp_nodes { struct device_node *prcm_node; struct device_node *cpucfg_node; struct device_node *sram_node; + struct device_node *r_cpucfg_node; }; /* This structure holds SoC-specific bits tied to an enable-method string. */ @@ -94,6 +104,7 @@ extern void sunxi_mc_smp_secondary_startup(void); extern void sunxi_mc_smp_resume(void); static int __init sun9i_a80_get_smp_nodes(struct sunxi_mc_smp_nodes *nodes); +static int __init sun8i_a83t_get_smp_nodes(struct sunxi_mc_smp_nodes *nodes); static const struct sunxi_mc_smp_data sunxi_mc_smp_data[] __initconst = { { @@ -101,6 +112,11 @@ static const struct sunxi_mc_smp_data sunxi_mc_smp_data[] __initconst = { .get_smp_nodes = sun9i_a80_get_smp_nodes, .is_sun9i = true, }, + { + .enable_method = "allwinner,sun8i-a83t-smp", + .get_smp_nodes = sun8i_a83t_get_smp_nodes, + .is_sun9i = false, + }, }; static bool sunxi_core_is_cortex_a15(unsigned int core, unsigned int cluster) @@ -188,6 +204,16 @@ static int sunxi_cpu_powerup(unsigned int cpu, unsigned int cluster) reg &= ~PRCM_CPU_PO_RST_CTRL_CORE(cpu); writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + if (r_cpucfg_base) { + /* assert cpu power-on reset */ + reg = readl(r_cpucfg_base + + R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster)); + reg &= ~(R_CPUCFG_CLUSTER_PO_RST_CTRL_CORE(cpu)); + writel(reg, r_cpucfg_base + + R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster)); + udelay(10); + } + /* Cortex-A7: hold L1 reset disable signal low */ if (!sunxi_core_is_cortex_a15(cpu, cluster)) { reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG0(cluster)); @@ -211,17 +237,38 @@ static int sunxi_cpu_powerup(unsigned int cpu, unsigned int cluster) /* open power switch */ sunxi_cpu_power_switch_set(cpu, cluster, true); + /* Handle A83T bit swap */ + if (!sunxi_mc_smp_data[index].is_sun9i) { + if (cpu == 0) + cpu = 4; + } + /* 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); + /* Handle A83T bit swap */ + if (!sunxi_mc_smp_data[index].is_sun9i) { + if (cpu == 4) + cpu = 0; + } + /* 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)); + if (r_cpucfg_base) { + reg = readl(r_cpucfg_base + + R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster)); + reg |= R_CPUCFG_CLUSTER_PO_RST_CTRL_CORE(cpu); + writel(reg, r_cpucfg_base + + R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster)); + udelay(10); + } + /* de-assert all processor resets */ reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); reg |= CPUCFG_CX_RST_CTRL_DBG_RST(cpu); @@ -243,6 +290,14 @@ static int sunxi_cluster_powerup(unsigned int cluster) if (cluster >= SUNXI_NR_CLUSTERS) return -EINVAL; + /* For A83T, assert cluster cores resets */ + if (!sunxi_mc_smp_data[index].is_sun9i) { + reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + reg &= ~CPUCFG_CX_RST_CTRL_CORE_RST_ALL; /* Core Reset */ + writel(reg, cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); + udelay(10); + } + /* assert ACINACTM */ reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG1(cluster)); reg |= CPUCFG_CX_CTRL_REG1_ACINACTM; @@ -253,6 +308,16 @@ static int sunxi_cluster_powerup(unsigned int cluster) reg &= ~PRCM_CPU_PO_RST_CTRL_CORE_ALL; writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster)); + /* assert cluster cores resets */ + if (r_cpucfg_base) { + reg = readl(r_cpucfg_base + + R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster)); + reg &= ~CPUCFG_CX_RST_CTRL_CORE_RST_ALL; + writel(reg, r_cpucfg_base + + R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster)); + udelay(10); + } + /* assert cluster resets */ reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster)); reg &= ~CPUCFG_CX_RST_CTRL_DBG_SOC_RST; @@ -285,6 +350,8 @@ static int sunxi_cluster_powerup(unsigned int cluster) reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster)); if (sunxi_mc_smp_data[index].is_sun9i) reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I; + else + reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I; writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster)); udelay(20); @@ -483,6 +550,8 @@ static int sunxi_cluster_powerdown(unsigned int cluster) reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster)); if (sunxi_mc_smp_data[index].is_sun9i) reg |= PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I; + else + reg |= PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I; writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster)); udelay(20); @@ -564,8 +633,12 @@ static int sunxi_mc_smp_cpu_kill(unsigned int l_cpu) return !ret; } -static bool sunxi_mc_smp_cpu_can_disable(unsigned int __unused) +static bool sunxi_mc_smp_cpu_can_disable(unsigned int cpu) { + /* CPU0 hotplug handled only for sun9i-a80 */ + if (!sunxi_mc_smp_data[index].is_sun9i) + if (cpu == 0) + return false; return true; } #endif @@ -645,6 +718,7 @@ static void __init sunxi_mc_smp_put_nodes(struct sunxi_mc_smp_nodes *nodes) of_node_put(nodes->prcm_node); of_node_put(nodes->cpucfg_node); of_node_put(nodes->sram_node); + of_node_put(nodes->r_cpucfg_node); memset(nodes, 0, sizeof(*nodes)); } @@ -674,6 +748,32 @@ static int __init sun9i_a80_get_smp_nodes(struct sunxi_mc_smp_nodes *nodes) return 0; } +static int __init sun8i_a83t_get_smp_nodes(struct sunxi_mc_smp_nodes *nodes) +{ + nodes->prcm_node = of_find_compatible_node(NULL, NULL, + "allwinner,sun8i-a83t-r-ccu"); + if (!nodes->prcm_node) { + pr_err("%s: PRCM not available\n", __func__); + return -ENODEV; + } + + nodes->cpucfg_node = of_find_compatible_node(NULL, NULL, + "allwinner,sun8i-a83t-cpucfg"); + if (!nodes->cpucfg_node) { + pr_err("%s: CPUCFG not available\n", __func__); + return -ENODEV; + } + + nodes->r_cpucfg_node = of_find_compatible_node(NULL, NULL, + "allwinner,sun8i-a83t-r-cpucfg"); + if (!nodes->r_cpucfg_node) { + pr_err("%s: RCPUCFG not available\n", __func__); + return -ENODEV; + } + + return 0; +} + static int __init sunxi_mc_smp_init(void) { struct sunxi_mc_smp_nodes nodes = { 0 }; @@ -752,6 +852,15 @@ static int __init sunxi_mc_smp_init(void) pr_err("%s: failed to map secure SRAM\n", __func__); goto err_unmap_release_cpucfg; } + } else { + r_cpucfg_base = of_io_request_and_map(nodes.r_cpucfg_node, + 0, "sunxi-mc-smp"); + if (IS_ERR(r_cpucfg_base)) { + ret = PTR_ERR(r_cpucfg_base); + pr_err("%s: failed to map R-CPUCFG registers\n", + __func__); + goto err_unmap_release_cpucfg; + } } /* Configure CCI-400 for boot cluster */ @@ -759,7 +868,7 @@ static int __init sunxi_mc_smp_init(void) if (ret) { pr_err("%s: failed to configure boot cluster: %d\n", __func__, ret); - goto err_unmap_release_secure_sram; + goto err_unmap_release_sram_rcpucfg; } /* We don't need the device nodes anymore */ @@ -768,6 +877,8 @@ static int __init sunxi_mc_smp_init(void) /* Set the hardware entry point address */ if (sunxi_mc_smp_data[index].is_sun9i) addr = prcm_base + PRCM_CPU_SOFT_ENTRY_REG; + else + addr = r_cpucfg_base + R_CPUCFG_CPU_SOFT_ENTRY_REG; writel(__pa_symbol(sunxi_mc_smp_secondary_startup), addr); /* Actually enable multi cluster SMP */ @@ -777,10 +888,13 @@ static int __init sunxi_mc_smp_init(void) return 0; -err_unmap_release_secure_sram: +err_unmap_release_sram_rcpucfg: if (sunxi_mc_smp_data[index].is_sun9i) { iounmap(sram_b_smp_base); of_address_to_resource(nodes.sram_node, 0, &res); + } else { + iounmap(r_cpucfg_base); + of_address_to_resource(nodes.r_cpucfg_node, 0, &res); } release_mem_region(res.start, resource_size(&res)); err_unmap_release_cpucfg: -- 2.11.0