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author | Christian Krafft <krafft@de.ibm.com> | 2007-07-20 19:39:22 (GMT) |
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committer | Arnd Bergmann <arnd@klappe.arndb.de> | 2007-07-20 19:41:38 (GMT) |
commit | 74889e41d9a1f80928130a02af9b010673bc5ba7 (patch) | |
tree | 300feac7ceaad88b090ba385abd414281033425a /arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c | |
parent | 1e21fd5af3797a2c322e1723c69732e77aa74f48 (diff) | |
download | linux-fsl-qoriq-74889e41d9a1f80928130a02af9b010673bc5ba7.tar.xz |
[CELL] cbe_cpufreq: reorganize code
This patch reorganizes the code of the driver into three files.
Two cbe_cpufreq_pmi.c and cbe_cpufreq_pervasive.c care about hardware.
cbe_cpufreq.c contains the logic.
There is no changed behaviour, except that the PMI related function
is now located in a seperate module cbe_cpufreq_pmi. This module
will be required by cbe_cpufreq, if CONFIG_CBE_CPUFREQ_PMI has been set.
Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Diffstat (limited to 'arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c')
-rw-r--r-- | arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c b/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c new file mode 100644 index 0000000..163263b --- /dev/null +++ b/arch/powerpc/platforms/cell/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 "cbe_regs.h" +#include "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; + u64 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; +} + |