summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/cell/pervasive.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/powerpc/platforms/cell/pervasive.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/pervasive.c')
-rw-r--r--arch/powerpc/platforms/cell/pervasive.c125
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 000000000..58d967ee3
--- /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;
+}