Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / cpufreq / ppc_cbe_cpufreq_pervasive.c

diff --git a/kernel/drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c b/kernel/drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c
new file mode 100644 (file)
index 0000000..84d2f2c
--- /dev/null
+++ b/kernel/drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c
@@ -0,0 +1,115 @@
+/*
+ * pervasive backend for the cbe_cpufreq driver
+ *
+ * This driver makes use of the pervasive unit to
+ * engage the desired frequency.
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <asm/machdep.h>
+#include <asm/hw_irq.h>
+#include <asm/cell-regs.h>
+
+#include "ppc_cbe_cpufreq.h"
+
+/* to write to MIC register */
+static u64 MIC_Slow_Fast_Timer_table[] = {
+       [0 ... 7] = 0x007fc00000000000ull,
+};
+
+/* more values for the MIC */
+static u64 MIC_Slow_Next_Timer_table[] = {
+       0x0000240000000000ull,
+       0x0000268000000000ull,
+       0x000029C000000000ull,
+       0x00002D0000000000ull,
+       0x0000300000000000ull,
+       0x0000334000000000ull,
+       0x000039C000000000ull,
+       0x00003FC000000000ull,
+};
+
+
+int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode)
+{
+       struct cbe_pmd_regs __iomem *pmd_regs;
+       struct cbe_mic_tm_regs __iomem *mic_tm_regs;
+       unsigned long flags;
+       u64 value;
+#ifdef DEBUG
+       long time;
+#endif
+
+       local_irq_save(flags);
+
+       mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
+       pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+
+#ifdef DEBUG
+       time = jiffies;
+#endif
+
+       out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
+       out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
+
+       out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
+       out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
+
+       value = in_be64(&pmd_regs->pmcr);
+       /* set bits to zero */
+       value &= 0xFFFFFFFFFFFFFFF8ull;
+       /* set bits to next pmode */
+       value |= pmode;
+
+       out_be64(&pmd_regs->pmcr, value);
+
+#ifdef DEBUG
+       /* wait until new pmode appears in status register */
+       value = in_be64(&pmd_regs->pmsr) & 0x07;
+       while (value != pmode) {
+               cpu_relax();
+               value = in_be64(&pmd_regs->pmsr) & 0x07;
+       }
+
+       time = jiffies  - time;
+       time = jiffies_to_msecs(time);
+       pr_debug("had to wait %lu ms for a transition using " \
+                "pervasive unit\n", time);
+#endif
+       local_irq_restore(flags);
+
+       return 0;
+}
+
+
+int cbe_cpufreq_get_pmode(int cpu)
+{
+       int ret;
+       struct cbe_pmd_regs __iomem *pmd_regs;
+
+       pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+       ret = in_be64(&pmd_regs->pmsr) & 0x07;
+
+       return ret;
+}
+