1 files changed, 99 insertions, 0 deletions

diff --git a/arch/ppc/syslib/m8xx_wdt.c b/arch/ppc/syslib/m8xx_wdt.c
new file mode 100644
index 000000000000..7838a44bfd1d
--- /dev/null
+++ b/arch/ppc/syslib/m8xx_wdt.c
@@ -0,0 +1,99 @@
+/*
+ * m8xx_wdt.c - MPC8xx watchdog driver
+ *
+ * Author: Florian Schirmer <jolt@tuxbox.org>
+ *
+ * 2002 (c) Florian Schirmer <jolt@tuxbox.org> This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/8xx_immap.h>
+#include <syslib/m8xx_wdt.h>
+
+static int wdt_timeout;
+
+void m8xx_wdt_reset(void)
+{
+        volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
+
+        imap->im_siu_conf.sc_swsr = 0x556c;     /* write magic1 */
+        imap->im_siu_conf.sc_swsr = 0xaa39;     /* write magic2 */
+}
+
+static irqreturn_t m8xx_wdt_interrupt(int irq, void *dev, struct pt_regs *regs)
+{
+        volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
+
+        m8xx_wdt_reset();
+
+        imap->im_sit.sit_piscr |= PISCR_PS;     /* clear irq */
+
+        return IRQ_HANDLED;
+}
+
+void __init m8xx_wdt_handler_install(bd_t * binfo)
+{
+        volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
+        u32 pitc;
+        u32 sypcr;
+        u32 pitrtclk;
+
+        sypcr = imap->im_siu_conf.sc_sypcr;
+
+        if (!(sypcr & 0x04)) {
+                printk(KERN_NOTICE "m8xx_wdt: wdt disabled (SYPCR: 0x%08X)\n",
+                       sypcr);
+                return;
+        }
+
+        m8xx_wdt_reset();
+
+        printk(KERN_NOTICE
+               "m8xx_wdt: active wdt found (SWTC: 0x%04X, SWP: 0x%01X)\n",
+               (sypcr >> 16), sypcr & 0x01);
+
+        wdt_timeout = (sypcr >> 16) & 0xFFFF;
+
+        if (!wdt_timeout)
+                wdt_timeout = 0xFFFF;
+
+        if (sypcr & 0x01)
+                wdt_timeout *= 2048;
+
+        /*
+         * Fire trigger if half of the wdt ticked down 
+         */
+
+        if (imap->im_sit.sit_rtcsc & RTCSC_38K)
+                pitrtclk = 9600;
+        else
+                pitrtclk = 8192;
+
+        if ((wdt_timeout) > (UINT_MAX / pitrtclk))
+                pitc = wdt_timeout / binfo->bi_intfreq * pitrtclk / 2;
+        else
+                pitc = pitrtclk * wdt_timeout / binfo->bi_intfreq / 2;
+
+        imap->im_sit.sit_pitc = pitc << 16;
+        imap->im_sit.sit_piscr =
+            (mk_int_int_mask(PIT_INTERRUPT) << 8) | PISCR_PIE | PISCR_PTE;
+
+        if (request_irq(PIT_INTERRUPT, m8xx_wdt_interrupt, 0, "watchdog", NULL))
+                panic("m8xx_wdt: could not allocate watchdog irq!");
+
+        printk(KERN_NOTICE
+               "m8xx_wdt: keep-alive trigger installed (PITC: 0x%04X)\n", pitc);
+
+        wdt_timeout /= binfo->bi_intfreq;
+}
+
+int m8xx_wdt_get_timeout(void)
+{
+        return wdt_timeout;
+}