[PATCH v3 6/8] ARM: rockchip: add support smp for rk3036

Xing Zheng
2015-09-29T02:15:12Z

The rk3036 is dual-core soc, we can use this patch to enable cpu1
enter boot secondary, and hotplug(online/offline).

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---

Changes in v3: None

arch/arm/mach-rockchip/platsmp.c | 142 ++++++++++++++++++++++++++++++++++++++
1 file changed, 142 insertions(+)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 3e7a4b7..7864bf3 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -34,6 +34,8 @@

static void __iomem *scu_base_addr;
static void __iomem *sram_base_addr;
+static void __iomem *cru_base_addr;
+
static int ncores;

#define PMU_PWRDN_CON 0x08
@@ -41,6 +43,8 @@ static int ncores;

#define PMU_PWRDN_SCU 4

+#define RK3036_SOFTRST_CON(x) ((x) * 0x4 + 0x110)
+
static struct regmap *pmu;

static int pmu_power_domain_is_on(int pd)
@@ -350,3 +354,141 @@ static struct smp_operations rockchip_smp_ops __initdata = {
};

CPU_METHOD_OF_DECLARE(rk3066_smp, "rockchip,rk3066-smp", &rockchip_smp_ops);
+
+/* for RK3036 */
+
+static int rk3036_set_power_domain(int pd, bool on)
+{
+ struct reset_control *rstc = rockchip_get_core_reset(pd);
+ u32 val;
+
+ /* there are 2cpus on rk3036 soc, we just need to be care cpu1 */
+ if (pd != 1)
+ return 0;
+
+ if (IS_ERR(rstc) && read_cpuid_part() != ARM_CPU_PART_CORTEX_A9) {
+ pr_err("%s: could not get reset control for core %d\n",
+ __func__, pd);
+ return PTR_ERR(rstc);
+ }
+
+ /*
+ * We need to soft reset the cpu when we turn off the cpu power domain,
+ * or else the active processors might be stalled when the individual
+ * processor is powered down.
+ */
+ if (!IS_ERR(rstc) && !on)
+ reset_control_assert(rstc);
+
+ val = (on) ? 0 : 1;
+ val = (val << pd) | BIT(pd + 16);
+ writel_relaxed(val, cru_base_addr + RK3036_SOFTRST_CON(0));
+
+ dsb();
+
+ if (!IS_ERR(rstc)) {
+ if (on)
+ reset_control_deassert(rstc);
+ reset_control_put(rstc);
+ }
+
+ return 0;
+}
+
+static void __init rk3036_smp_prepare_cpus(unsigned int max_cpus)
+{
+ struct device_node *node;
+ unsigned int l2ctlr;
+ unsigned int i, cpu;
+
+ /* get cru_base_addr */
+ node = of_find_compatible_node(NULL, NULL, "rockchip,rk3036-cru");
+ if (!node) {
+ pr_err("%s: could not find cru dt node\n", __func__);
+ return;
+ }
+
+ cru_base_addr = of_iomap(node, 0);
+ if (!cru_base_addr) {
+ pr_err("%s: could not map cru registers\n", __func__);
+ return;
+ }
+
+ /* get sram_base_addr */
+ node = of_find_compatible_node(NULL, NULL, "rockchip,rk3036-smp-sram");
+ if (!node) {
+ pr_err("%s: could not find sram dt node\n", __func__);
+ return;
+ }
+
+ sram_base_addr = of_iomap(node, 0);
+ if (!sram_base_addr) {
+ pr_err("%s: could not map sram registers\n", __func__);
+ return;
+ }
+
+ /* get ncores */
+ asm ("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr));
+ ncores = ((l2ctlr >> 24) & 0x3) + 1;
+ cpu = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 0);
+
+ /* Make sure that all cores except the first are really off */
+ for (i = 1; i < ncores; i++)
+ rk3036_set_power_domain(0 + i, false);
+}
+
+static int rk3036_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ if (cpu >= ncores) {
+ pr_err("%s: cpu %d outside maximum number of cpus %d\n",
+ __func__, cpu, ncores);
+ return -ENXIO;
+ }
+
+ /* start the core */
+ rk3036_set_power_domain(0 + cpu, true);
+
+ /*
+ * We need to wait a moment after soft reset CPUx on rk3036,
+ * otherwise, CPUx will startup failed.
+ */
+ udelay(10);
+ writel(virt_to_phys(secondary_startup), sram_base_addr + 8);
+ writel(0xDEADBEAF, sram_base_addr + 4);
+ dsb_sev();
+
+ return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int rk3066_cpu_kill(unsigned int cpu)
+{
+ /*
+ * We need a delay here to ensure that the dying CPU can finish
+ * executing v7_coherency_exit() and reach the WFI/WFE state
+ * prior to having the power domain disabled.
+ */
+ mdelay(1);
+
+ rk3036_set_power_domain(0 + cpu, false);
+
+ return 1;
+}
+
+static void rk3066_cpu_die(unsigned int cpu)
+{
+ v7_exit_coherency_flush(louis);
+ while (1)
+ cpu_do_idle();
+}
+#endif
+
+static struct smp_operations rk3036_smp_ops __initdata = {
+ .smp_prepare_cpus = rk3036_smp_prepare_cpus,
+ .smp_boot_secondary = rk3036_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_kill = rk3066_cpu_kill,
+ .cpu_die = rk3066_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(rk3036_smp, "rockchip,rk3036-smp", &rk3036_smp_ops);
--
1.7.9.5