Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 125 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/pervasive.c b/arch/powerpc/platforms/cell/pervasive.c
new file mode 100644
index 0000000000..58d967ee38
--- /dev/null
+++ b/arch/powerpc/platforms/cell/pervasive.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * CBE Pervasive Monitor and Debug
+ *
+ * (C) Copyright IBM Corporation 2005
+ *
+ * Authors: Maximino Aguilar (maguilar@us.ibm.com)
+ *          Michael N. Day (mnday@us.ibm.com)
+ */
+
+#undef DEBUG
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/percpu.h>
+#include <linux/types.h>
+#include <linux/kallsyms.h>
+#include <linux/pgtable.h>
+
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/reg.h>
+#include <asm/cell-regs.h>
+#include <asm/cpu_has_feature.h>
+
+#include "pervasive.h"
+#include "ras.h"
+
+static void cbe_power_save(void)
+{
+	unsigned long ctrl, thread_switch_control;
+
+	/* Ensure our interrupt state is properly tracked */
+	if (!prep_irq_for_idle())
+		return;
+
+	ctrl = mfspr(SPRN_CTRLF);
+
+	/* Enable DEC and EE interrupt request */
+	thread_switch_control  = mfspr(SPRN_TSC_CELL);
+	thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;
+
+	switch (ctrl & CTRL_CT) {
+	case CTRL_CT0:
+		thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
+		break;
+	case CTRL_CT1:
+		thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
+		break;
+	default:
+		printk(KERN_WARNING "%s: unknown configuration\n",
+			__func__);
+		break;
+	}
+	mtspr(SPRN_TSC_CELL, thread_switch_control);
+
+	/*
+	 * go into low thread priority, medium priority will be
+	 * restored for us after wake-up.
+	 */
+	HMT_low();
+
+	/*
+	 * atomically disable thread execution and runlatch.
+	 * External and Decrementer exceptions are still handled when the
+	 * thread is disabled but now enter in cbe_system_reset_exception()
+	 */
+	ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
+	mtspr(SPRN_CTRLT, ctrl);
+
+	/* Re-enable interrupts in MSR */
+	__hard_irq_enable();
+}
+
+static int cbe_system_reset_exception(struct pt_regs *regs)
+{
+	switch (regs->msr & SRR1_WAKEMASK) {
+	case SRR1_WAKEDEC:
+		set_dec(1);
+		break;
+	case SRR1_WAKEEE:
+		/*
+		 * Handle these when interrupts get re-enabled and we take
+		 * them as regular exceptions. We are in an NMI context
+		 * and can't handle these here.
+		 */
+		break;
+	case SRR1_WAKEMT:
+		return cbe_sysreset_hack();
+#ifdef CONFIG_CBE_RAS
+	case SRR1_WAKESYSERR:
+		cbe_system_error_exception(regs);
+		break;
+	case SRR1_WAKETHERM:
+		cbe_thermal_exception(regs);
+		break;
+#endif /* CONFIG_CBE_RAS */
+	default:
+		/* do system reset */
+		return 0;
+	}
+	/* everything handled */
+	return 1;
+}
+
+void __init cbe_pervasive_init(void)
+{
+	int cpu;
+
+	if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
+		return;
+
+	for_each_possible_cpu(cpu) {
+		struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu);
+		if (!regs)
+			continue;
+
+		 /* Enable Pause(0) control bit */
+		out_be64(&regs->pmcr, in_be64(&regs->pmcr) |
+					    CBE_PMD_PAUSE_ZERO_CONTROL);
+	}
+
+	ppc_md.power_save = cbe_power_save;
+	ppc_md.system_reset_exception = cbe_system_reset_exception;
+}