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authorBen Dooks <ben-linux@fluff.org>2008-11-21 10:36:03 +0000
committerBen Dooks <ben-linux@fluff.org>2008-12-16 10:01:23 +0000
commitb09bcdd4c2f52b54115895c4d62ad82918f71431 (patch)
treed6e7e39a0f31c98403af4362fb97bfa9345883dc /arch/arm/plat-s3c24xx
parent44539a711217898358ae456fc0f81f5f4652abd5 (diff)
[ARM] S3C64XX: Update TCFG for new timer divider settings.
The S3C64XX series has a new TCFG divider setting to allow the clock directly through, which means that we need to update the pwm-clock code to cope with this. Add <mach/pwm-clock.h> containing the specific code to deal with the TCFG divider settings and provide any other per-arch data that the pwm-clock driver needs to function. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-s3c24xx')
-rw-r--r--arch/arm/plat-s3c24xx/include/mach/pwm-clock.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c24xx/include/mach/pwm-clock.h b/arch/arm/plat-s3c24xx/include/mach/pwm-clock.h
new file mode 100644
index 00000000000..a087de21bc2
--- /dev/null
+++ b/arch/arm/plat-s3c24xx/include/mach/pwm-clock.h
@@ -0,0 +1,55 @@
+/* linux/arch/arm/plat-s3c24xx/include/mach/pwm-clock.h
+ *
+ * Copyright 2008 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ * http://armlinux.simtec.co.uk/
+ *
+ * S3C24xx - pwm clock and timer support
+ */
+
+/**
+ * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk
+ * @cfg: The timer TCFG1 register bits shifted down to 0.
+ *
+ * Return true if the given configuration from TCFG1 is a TCLK instead
+ * any of the TDIV clocks.
+ */
+static inline int pwm_cfg_src_is_tclk(unsigned long tcfg)
+{
+ return tcfg == S3C2410_TCFG1_MUX_TCLK;
+}
+
+/**
+ * tcfg_to_divisor() - convert tcfg1 setting to a divisor
+ * @tcfg1: The tcfg1 setting, shifted down.
+ *
+ * Get the divisor value for the given tcfg1 setting. We assume the
+ * caller has already checked to see if this is not a TCLK source.
+ */
+static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
+{
+ return 1 << (1 + tcfg1);
+}
+
+/**
+ * pwm_tdiv_has_div1() - does the tdiv setting have a /1
+ *
+ * Return true if we have a /1 in the tdiv setting.
+ */
+static inline unsigned int pwm_tdiv_has_div1(void)
+{
+ return 0;
+}
+
+/**
+ * pwm_tdiv_div_bits() - calculate TCFG1 divisor value.
+ * @div: The divisor to calculate the bit information for.
+ *
+ * Turn a divisor into the necessary bit field for TCFG1.
+ */
+static inline unsigned long pwm_tdiv_div_bits(unsigned int div)
+{
+ return ilog2(div) - 1;
+}
+
+#define S3C_TCFG1_MUX_TCLK S3C2410_TCFG1_MUX_TCLK