1 files changed, 159 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf548/cpu.c b/arch/blackfin/mach-bf548/cpu.c
new file mode 100644
index 000000000000..4298a3ccfbfc
--- /dev/null
+++ b/arch/blackfin/mach-bf548/cpu.c
@@ -0,0 +1,159 @@
+/*
+ * File:         arch/blackfin/mach-bf548/cpu.c
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:  clock scaling for the bf54x
+ *
+ * Modified:
+ *               Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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 of the License, 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <asm/dpmc.h>
+#include <linux/fs.h>
+#include <asm/bfin-global.h>
+
+/* CONFIG_CLKIN_HZ=25000000 */
+#define VCO5 (CONFIG_CLKIN_HZ*45)
+#define VCO4 (CONFIG_CLKIN_HZ*36)
+#define VCO3 (CONFIG_CLKIN_HZ*27)
+#define VCO2 (CONFIG_CLKIN_HZ*18)
+#define VCO1 (CONFIG_CLKIN_HZ*9)
+#define VCO(x) VCO##x
+
+#define MFREQ(x) {VCO(x),VCO(x)/4},{VCO(x),VCO(x)/2},{VCO(x),VCO(x)}
+/* frequency */
+static struct cpufreq_frequency_table bf548_freq_table[] = {
+        MFREQ(1),
+        MFREQ(3),
+        {VCO4, VCO4 / 2}, {VCO4, VCO4},
+        MFREQ(5),
+        {0, CPUFREQ_TABLE_END},
+};
+
+/*
+ * dpmc_fops->ioctl()
+ * static int dpmc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+ */
+static int bf548_getfreq(unsigned int cpu)
+{
+        unsigned long cclk_mhz;
+
+        /* The driver only support single cpu */
+        if (cpu == 0)
+                dpmc_fops.ioctl(NULL, NULL, IOCTL_GET_CORECLOCK, &cclk_mhz);
+        else
+                cclk_mhz = -1;
+
+        return cclk_mhz;
+}
+
+static int bf548_target(struct cpufreq_policy *policy,
+                            unsigned int target_freq, unsigned int relation)
+{
+        unsigned long cclk_mhz;
+        unsigned long vco_mhz;
+        unsigned long flags;
+        unsigned int index;
+        struct cpufreq_freqs freqs;
+
+        if (cpufreq_frequency_table_target(policy, bf548_freq_table, target_freq, relation, &index))
+                return -EINVAL;
+
+        cclk_mhz = bf548_freq_table[index].frequency;
+        vco_mhz = bf548_freq_table[index].index;
+
+        dpmc_fops.ioctl(NULL, NULL, IOCTL_CHANGE_FREQUENCY, &vco_mhz);
+        freqs.old = bf548_getfreq(0);
+        freqs.new = cclk_mhz;
+        freqs.cpu = 0;
+
+        pr_debug("cclk begin change to cclk %d,vco=%d,index=%d,target=%d,oldfreq=%d\n",
+                 cclk_mhz, vco_mhz, index, target_freq, freqs.old);
+
+        cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+        local_irq_save(flags);
+        dpmc_fops.ioctl(NULL, NULL, IOCTL_SET_CCLK, &cclk_mhz);
+        local_irq_restore(flags);
+        cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+        vco_mhz = get_vco();
+        cclk_mhz = get_cclk();
+        return 0;
+}
+
+/* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
+ * this platform, anyway.
+ */
+static int bf548_verify_speed(struct cpufreq_policy *policy)
+{
+        return cpufreq_frequency_table_verify(policy, &bf548_freq_table);
+}
+
+static int __init __bf548_cpu_init(struct cpufreq_policy *policy)
+{
+        if (policy->cpu != 0)
+                return -EINVAL;
+
+        policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
+
+        policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+        /*Now ,only support one cpu */
+        policy->cur = bf548_getfreq(0);
+        cpufreq_frequency_table_get_attr(bf548_freq_table, policy->cpu);
+        return cpufreq_frequency_table_cpuinfo(policy, bf548_freq_table);
+}
+
+static struct freq_attr *bf548_freq_attr[] = {
+        &cpufreq_freq_attr_scaling_available_freqs,
+        NULL,
+};
+
+static struct cpufreq_driver bf548_driver = {
+        .verify = bf548_verify_speed,
+        .target = bf548_target,
+        .get = bf548_getfreq,
+        .init = __bf548_cpu_init,
+        .name = "bf548",
+        .owner = THIS_MODULE,
+        .attr = bf548_freq_attr,
+};
+
+static int __init bf548_cpu_init(void)
+{
+        return cpufreq_register_driver(&bf548_driver);
+}
+
+static void __exit bf548_cpu_exit(void)
+{
+        cpufreq_unregister_driver(&bf548_driver);
+}
+
+MODULE_AUTHOR("Mickael Kang");
+MODULE_DESCRIPTION("cpufreq driver for BF548 CPU");
+MODULE_LICENSE("GPL");
+
+module_init(bf548_cpu_init);
+module_exit(bf548_cpu_exit);