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Message-Id: <20180219081837.15482-2-mylene.josserand@bootlin.com>
Date: Mon, 19 Feb 2018 09:18:31 +0100
From: Mylène Josserand <mylene.josserand@...tlin.com>
To: maxime.ripard@...tlin.com, wens@...e.org, linux@...linux.org.uk,
robh+dt@...nel.org, mark.rutland@....com
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, clabbe.montjoie@...il.com,
thomas.petazzoni@...tlin.com, mylene.josserand@...tlin.com,
quentin.schulz@...tlin.com
Subject: [PATCH v3 1/7] ARM: sun8i: smp: Add support for A83T
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.
Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
---
arch/arm/mach-sunxi/Kconfig | 2 +-
arch/arm/mach-sunxi/mc_smp.c | 239 +++++++++++++++++++++++++++++++++++--------
2 files changed, 198 insertions(+), 43 deletions(-)
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index ce53ceaf4cc5..a0ad35c41c02 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -51,7 +51,7 @@ config MACH_SUN9I
config ARCH_SUNXI_MC_SMP
bool
depends on SMP
- default MACH_SUN9I
+ default y if MACH_SUN9I || MACH_SUN8I
select ARM_CCI400_PORT_CTRL
select ARM_CPU_SUSPEND
diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c
index 11e46c6efb90..fec592bf68b4 100644
--- a/arch/arm/mach-sunxi/mc_smp.c
+++ b/arch/arm/mach-sunxi/mc_smp.c
@@ -55,20 +55,29 @@
#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))
-#define PRCM_PWROFF_GATING_REG_CLUSTER BIT(4)
+/* The power off register for clusters are different from SUN9I and SUN8I */
+#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 *r_cpucfg_base;
static void __iomem *prcm_base;
static void __iomem *sram_b_smp_base;
@@ -157,6 +166,16 @@ 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));
@@ -180,17 +199,37 @@ 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 (of_machine_is_compatible("allwinner,sun8i-a83t")) {
+ 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);
+ if (of_machine_is_compatible("allwinner,sun8i-a83t")) {
+ 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);
@@ -212,6 +251,14 @@ static int sunxi_cluster_powerup(unsigned int cluster)
if (cluster >= SUNXI_NR_CLUSTERS)
return -EINVAL;
+ /* For A83T, assert cluster cores resets */
+ if (of_machine_is_compatible("allwinner,sun8i-a83t")) {
+ 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;
@@ -222,6 +269,16 @@ 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;
@@ -252,7 +309,10 @@ static int sunxi_cluster_powerup(unsigned int cluster)
/* clear cluster power gate */
reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster));
- reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER;
+ if (of_machine_is_compatible("allwinner,sun8i-a83t"))
+ reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I;
+ else
+ reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I;
writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster));
udelay(20);
@@ -516,7 +576,10 @@ static int sunxi_cluster_powerdown(unsigned int cluster)
/* gate cluster power */
pr_debug("%s: gate cluster power\n", __func__);
reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster));
- reg |= PRCM_PWROFF_GATING_REG_CLUSTER;
+ if (of_machine_is_compatible("allwinner,sun8i-a83t"))
+ reg |= PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I;
+ else
+ reg |= PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I;
writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster));
udelay(20);
@@ -684,37 +747,25 @@ static int __init sunxi_mc_smp_lookback(void)
return ret;
}
-static int __init sunxi_mc_smp_init(void)
+static int sun9i_dt_parsing(struct resource res)
{
- struct device_node *cpucfg_node, *sram_node, *node;
- struct resource res;
+ struct device_node *prcm_node, *cpucfg_node, *sram_node;
int ret;
- if (!of_machine_is_compatible("allwinner,sun9i-a80"))
- return -ENODEV;
-
- if (!sunxi_mc_smp_cpu_table_init())
- return -EINVAL;
-
- if (!cci_probed()) {
- pr_err("%s: CCI-400 not available\n", __func__);
- return -ENODEV;
- }
-
- node = of_find_compatible_node(NULL, NULL, "allwinner,sun9i-a80-prcm");
- if (!node) {
- pr_err("%s: PRCM not available\n", __func__);
+ prcm_node = of_find_compatible_node(NULL, NULL,
+ "allwinner,sun9i-a80-prcm");
+ if (!prcm_node)
return -ENODEV;
- }
/*
* Unfortunately we can not request the I/O region for the PRCM.
* It is shared with the PRCM clock.
*/
- prcm_base = of_iomap(node, 0);
- of_node_put(node);
+ prcm_base = of_iomap(prcm_node, 0);
+ of_node_put(prcm_node);
if (!prcm_base) {
pr_err("%s: failed to map PRCM registers\n", __func__);
+ iounmap(prcm_base);
return -ENOMEM;
}
@@ -748,35 +799,88 @@ static int __init sunxi_mc_smp_init(void)
goto err_put_sram_node;
}
- /* Configure CCI-400 for boot cluster */
- ret = sunxi_mc_smp_lookback();
- if (ret) {
- pr_err("%s: failed to configure boot cluster: %d\n",
- __func__, ret);
- goto err_unmap_release_secure_sram;
- }
+ r_cpucfg_base = NULL;
/* We don't need the CPUCFG and SRAM device nodes anymore */
of_node_put(cpucfg_node);
of_node_put(sram_node);
- /* Set the hardware entry point address */
- writel(__pa_symbol(sunxi_mc_smp_secondary_startup),
- prcm_base + PRCM_CPU_SOFT_ENTRY_REG);
-
- /* Actually enable multi cluster SMP */
- smp_set_ops(&sunxi_mc_smp_smp_ops);
-
- pr_info("sunxi multi cluster SMP support installed\n");
-
return 0;
-err_unmap_release_secure_sram:
- iounmap(sram_b_smp_base);
- of_address_to_resource(sram_node, 0, &res);
+err_unmap_release_cpucfg:
+ iounmap(cpucfg_base);
+ of_address_to_resource(cpucfg_node, 0, &res);
release_mem_region(res.start, resource_size(&res));
err_put_sram_node:
of_node_put(sram_node);
+err_put_cpucfg_node:
+ of_node_put(cpucfg_node);
+err_unmap_prcm:
+ iounmap(prcm_base);
+
+ return ret;
+}
+
+static int sun8i_dt_parsing(struct resource res)
+{
+ struct device_node *node, *cpucfg_node;
+ int ret;
+
+ node = of_find_compatible_node(NULL, NULL,
+ "allwinner,sun8i-a83t-prcm");
+ if (!node)
+ return -ENODEV;
+
+ /*
+ * Unfortunately we can not request the I/O region for the PRCM.
+ * It is shared with the PRCM clock.
+ */
+ 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;
+ }
+
+ cpucfg_node = of_find_compatible_node(NULL, NULL,
+ "allwinner,sun8i-a83t-cpucfg");
+ if (!cpucfg_node) {
+ ret = -ENODEV;
+ pr_err("%s: CPUCFG not available\n", __func__);
+ goto err_unmap_prcm;
+ }
+
+ cpucfg_base = of_io_request_and_map(cpucfg_node, 0, "sunxi-mc-smp");
+ if (IS_ERR(cpucfg_base)) {
+ ret = PTR_ERR(cpucfg_base);
+ pr_err("%s: failed to map CPUCFG registers: %d\n",
+ __func__, ret);
+ goto err_put_cpucfg_node;
+ }
+
+ node = of_find_compatible_node(NULL, NULL,
+ "allwinner,sun8i-a83t-r-cpucfg");
+ if (!node) {
+ ret = -ENODEV;
+ goto err_unmap_release_cpucfg;
+ }
+
+ r_cpucfg_base = of_iomap(node, 0);
+ if (!r_cpucfg_base) {
+ pr_err("%s: failed to map R-CPUCFG registers\n",
+ __func__);
+ ret = -ENOMEM;
+ goto err_put_node;
+ }
+
+ /* We don't need the CPUCFG device node anymore */
+ of_node_put(cpucfg_node);
+ of_node_put(node);
+
+ return 0;
+err_put_node:
+ of_node_put(node);
err_unmap_release_cpucfg:
iounmap(cpucfg_base);
of_address_to_resource(cpucfg_node, 0, &res);
@@ -785,6 +889,57 @@ static int __init sunxi_mc_smp_init(void)
of_node_put(cpucfg_node);
err_unmap_prcm:
iounmap(prcm_base);
+
+ return ret;
+}
+
+static int __init sunxi_mc_smp_init(void)
+{
+ struct resource res;
+ int ret;
+
+ if (!of_machine_is_compatible("allwinner,sun9i-a80") &&
+ !of_machine_is_compatible("allwinner,sun8i-a83t"))
+ return -ENODEV;
+
+ if (!sunxi_mc_smp_cpu_table_init())
+ return -EINVAL;
+
+ if (!cci_probed()) {
+ pr_err("%s: CCI-400 not available\n", __func__);
+ return -ENODEV;
+ }
+
+ if (of_machine_is_compatible("allwinner,sun9i-a80"))
+ ret = sun9i_dt_parsing(res);
+ else
+ ret = sun8i_dt_parsing(res);
+ if (ret) {
+ pr_err("%s: failed to parse DT: %d\n", __func__, ret);
+ return ret;
+ }
+
+ /* Configure CCI-400 for boot cluster */
+ ret = sunxi_mc_smp_lookback();
+ if (ret) {
+ pr_err("%s: failed to configure boot cluster: %d\n",
+ __func__, ret);
+ return ret; /* MYMY: Need to handle this error case */
+ }
+
+ /* Set the hardware entry point address */
+ if (of_machine_is_compatible("allwinner,sun9i-a80"))
+ writel(__pa_symbol(sunxi_mc_smp_secondary_startup),
+ prcm_base + PRCM_CPU_SOFT_ENTRY_REG);
+ else
+ writel(__pa_symbol(sunxi_mc_smp_secondary_startup),
+ r_cpucfg_base + R_CPUCFG_CPU_SOFT_ENTRY_REG);
+
+ /* Actually enable multi cluster SMP */
+ smp_set_ops(&sunxi_mc_smp_smp_ops);
+
+ pr_info("sunxi multi cluster SMP support installed\n");
+
return ret;
}
--
2.11.0
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