summaryrefslogtreecommitdiff
path: root/arch/frv/kernel/sysctl.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/frv/kernel/sysctl.c')
-rw-r--r--arch/frv/kernel/sysctl.c221
1 files changed, 221 insertions, 0 deletions
diff --git a/arch/frv/kernel/sysctl.c b/arch/frv/kernel/sysctl.c
new file mode 100644
index 000000000..f4dfae2c7
--- /dev/null
+++ b/arch/frv/kernel/sysctl.c
@@ -0,0 +1,221 @@
+/* sysctl.c: implementation of /proc/sys files relating to FRV specifically
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.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 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+
+static const char frv_cache_wback[] = "wback";
+static const char frv_cache_wthru[] = "wthru";
+
+static void frv_change_dcache_mode(unsigned long newmode)
+{
+ unsigned long flags, hsr0;
+
+ local_irq_save(flags);
+
+ hsr0 = __get_HSR(0);
+ hsr0 &= ~HSR0_DCE;
+ __set_HSR(0, hsr0);
+
+ asm volatile(" dcef @(gr0,gr0),#1 \n"
+ " membar \n"
+ : : : "memory"
+ );
+
+ hsr0 = (hsr0 & ~HSR0_CBM) | newmode;
+ __set_HSR(0, hsr0);
+ hsr0 |= HSR0_DCE;
+ __set_HSR(0, hsr0);
+
+ local_irq_restore(flags);
+
+ //printk("HSR0 now %08lx\n", hsr0);
+}
+
+/*****************************************************************************/
+/*
+ * handle requests to dynamically switch the write caching mode delivered by /proc
+ */
+static int procctl_frv_cachemode(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ unsigned long hsr0;
+ char buff[8];
+ int len;
+
+ len = *lenp;
+
+ if (write) {
+ /* potential state change */
+ if (len <= 1 || len > sizeof(buff) - 1)
+ return -EINVAL;
+
+ if (copy_from_user(buff, buffer, len) != 0)
+ return -EFAULT;
+
+ if (buff[len - 1] == '\n')
+ buff[len - 1] = '\0';
+ else
+ buff[len] = '\0';
+
+ if (strcmp(buff, frv_cache_wback) == 0) {
+ /* switch dcache into write-back mode */
+ frv_change_dcache_mode(HSR0_CBM_COPY_BACK);
+ return 0;
+ }
+
+ if (strcmp(buff, frv_cache_wthru) == 0) {
+ /* switch dcache into write-through mode */
+ frv_change_dcache_mode(HSR0_CBM_WRITE_THRU);
+ return 0;
+ }
+
+ return -EINVAL;
+ }
+
+ /* read the state */
+ if (*ppos > 0) {
+ *lenp = 0;
+ return 0;
+ }
+
+ hsr0 = __get_HSR(0);
+ switch (hsr0 & HSR0_CBM) {
+ case HSR0_CBM_WRITE_THRU:
+ memcpy(buff, frv_cache_wthru, sizeof(frv_cache_wthru) - 1);
+ buff[sizeof(frv_cache_wthru) - 1] = '\n';
+ len = sizeof(frv_cache_wthru);
+ break;
+ default:
+ memcpy(buff, frv_cache_wback, sizeof(frv_cache_wback) - 1);
+ buff[sizeof(frv_cache_wback) - 1] = '\n';
+ len = sizeof(frv_cache_wback);
+ break;
+ }
+
+ if (len > *lenp)
+ len = *lenp;
+
+ if (copy_to_user(buffer, buff, len) != 0)
+ return -EFAULT;
+
+ *lenp = len;
+ *ppos = len;
+ return 0;
+
+} /* end procctl_frv_cachemode() */
+
+/*****************************************************************************/
+/*
+ * permit the mm_struct the nominated process is using have its MMU context ID pinned
+ */
+#ifdef CONFIG_MMU
+static int procctl_frv_pin_cxnr(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ pid_t pid;
+ char buff[16], *p;
+ int len;
+
+ len = *lenp;
+
+ if (write) {
+ /* potential state change */
+ if (len <= 1 || len > sizeof(buff) - 1)
+ return -EINVAL;
+
+ if (copy_from_user(buff, buffer, len) != 0)
+ return -EFAULT;
+
+ if (buff[len - 1] == '\n')
+ buff[len - 1] = '\0';
+ else
+ buff[len] = '\0';
+
+ pid = simple_strtoul(buff, &p, 10);
+ if (*p)
+ return -EINVAL;
+
+ return cxn_pin_by_pid(pid);
+ }
+
+ /* read the currently pinned CXN */
+ if (*ppos > 0) {
+ *lenp = 0;
+ return 0;
+ }
+
+ len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned);
+ if (len > *lenp)
+ len = *lenp;
+
+ if (copy_to_user(buffer, buff, len) != 0)
+ return -EFAULT;
+
+ *lenp = len;
+ *ppos = len;
+ return 0;
+
+} /* end procctl_frv_pin_cxnr() */
+#endif
+
+/*
+ * FR-V specific sysctls
+ */
+static struct ctl_table frv_table[] =
+{
+ {
+ .procname = "cache-mode",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0644,
+ .proc_handler = procctl_frv_cachemode,
+ },
+#ifdef CONFIG_MMU
+ {
+ .procname = "pin-cxnr",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0644,
+ .proc_handler = procctl_frv_pin_cxnr
+ },
+#endif
+ {}
+};
+
+/*
+ * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
+ * when all the PM interfaces exist nicely.
+ */
+static struct ctl_table frv_dir_table[] =
+{
+ {
+ .procname = "frv",
+ .mode = 0555,
+ .child = frv_table
+ },
+ {}
+};
+
+/*
+ * Initialize power interface
+ */
+static int __init frv_sysctl_init(void)
+{
+ register_sysctl_table(frv_dir_table);
+ return 0;
+}
+
+__initcall(frv_sysctl_init);