Changeset 08d059a in mainline

Timestamp:

2012-03-13T04:08:21Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d1714e8

Parents:

08a2007

Message:

amdm37x_gpt: Fix timer setup.

Qemu does not support advanced timer functionality, so I can't tell whether it will work as expected. The numbers look correct though.

File:

• kernel/genarch/include/drivers/amdm37x_gpt/amdm37x_gpt.h (modified) (2 diffs)

kernel/genarch/include/drivers/amdm37x_gpt/amdm37x_gpt.h

@@ -202 +202 @@
         timer->regs = (void*) km_map(ioregs, iosize, PAGE_NOT_CACHEABLE);
 
-        /* Set tldr and tccr */
-        timer->regs->tldr = 0xffffffff - 32768 / hz;
-        timer->regs->tccr = 0xffffffff - 32768 / hz;
 
         /* Set autoreload */
@@ -213 +210 @@
             (ioregs == AMDM37x_GPT2_BASE_ADDRESS) ||
             (ioregs == AMDM37x_GPT10_BASE_ADDRESS));
+        timer->regs->tldr = 0xffffffff - (32768 / hz) + 1;
+        if (timer->special_available) {
+                /* Set values for according to formula (manual p. 2733) */
+                const uint32_t tpir =
+                    ((32768 / hz + 1) * 1000000) - (32768000L * (1000 / hz));
+                const uint32_t tnir =
+                    ((32768 / hz) * 1000000) - (32768000 * (1000 / hz));
+                timer->regs->tpir = tpir;
+                timer->regs->tnir = tnir;
+        }
 
 }