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authorLinus Torvalds <torvalds@linux-foundation.org>2009-06-15 00:42:43 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-15 00:42:43 +0400
commit2cf4d4514d5b43c1f3b64bd0ec8b9853bde8f1dc (patch)
treee35a625496acc6ac852846d40b8851186b9d1ac4 /arch/arm/plat-s3c64xx/s3c6400-clock.c
parent44b7532b8b464f606053562400719c9c21276037 (diff)
parentce53895a5d24e0ee19fb92f56c17323fb4c9ab27 (diff)
downloadlinux-2cf4d4514d5b43c1f3b64bd0ec8b9853bde8f1dc.tar.xz
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (417 commits) MAINTAINERS: EB110ATX is not ebsa110 MAINTAINERS: update Eric Miao's email address and status fb: add support of LCD display controller on pxa168/910 (base layer) [ARM] 5552/1: ep93xx get_uart_rate(): use EP93XX_SYSCON_PWRCNT and EP93XX_SYSCON_PWRCN [ARM] pxa/sharpsl_pm: zaurus needs generic pxa suspend/resume routines [ARM] 5544/1: Trust PrimeCell resource sizes [ARM] pxa/sharpsl_pm: cleanup of gpio-related code. [ARM] pxa/sharpsl_pm: drop set_irq_type calls [ARM] pxa/sharpsl_pm: merge pxa-specific code into generic one [ARM] pxa/sharpsl_pm: merge the two sharpsl_pm.c since it's now pxa specific [ARM] sa1100: remove unused collie_pm.c [ARM] pxa: fix the conflicting non-static declarations of global_gpios[] [ARM] 5550/1: Add default configure file for w90p910 platform [ARM] 5549/1: Add clock api for w90p910 platform. [ARM] 5548/1: Add gpio api for w90p910 platform [ARM] 5551/1: Add multi-function pin api for w90p910 platform. [ARM] Make ARM_VIC_NR depend on ARM_VIC [ARM] 5546/1: ARM PL022 SSP/SPI driver v3 ARM: OMAP4: SMP: Update defconfig for OMAP4430 ARM: OMAP4: SMP: Enable SMP support for OMAP4430 ...
Diffstat (limited to 'arch/arm/plat-s3c64xx/s3c6400-clock.c')
-rw-r--r--arch/arm/plat-s3c64xx/s3c6400-clock.c106
1 files changed, 105 insertions, 1 deletions
diff --git a/arch/arm/plat-s3c64xx/s3c6400-clock.c b/arch/arm/plat-s3c64xx/s3c6400-clock.c
index 05b17528041e..1debc1f9f987 100644
--- a/arch/arm/plat-s3c64xx/s3c6400-clock.c
+++ b/arch/arm/plat-s3c64xx/s3c6400-clock.c
@@ -133,6 +133,65 @@ static struct clksrc_clk clk_mout_mpll = {
.sources = &clk_src_mpll,
};
+static unsigned int armclk_mask;
+
+static unsigned long s3c64xx_clk_arm_get_rate(struct clk *clk)
+{
+ unsigned long rate = clk_get_rate(clk->parent);
+ u32 clkdiv;
+
+ /* divisor mask starts at bit0, so no need to shift */
+ clkdiv = __raw_readl(S3C_CLK_DIV0) & armclk_mask;
+
+ return rate / (clkdiv + 1);
+}
+
+static unsigned long s3c64xx_clk_arm_round_rate(struct clk *clk,
+ unsigned long rate)
+{
+ unsigned long parent = clk_get_rate(clk->parent);
+ u32 div;
+
+ if (parent < rate)
+ return rate;
+
+ div = (parent / rate) - 1;
+ if (div > armclk_mask)
+ div = armclk_mask;
+
+ return parent / (div + 1);
+}
+
+static int s3c64xx_clk_arm_set_rate(struct clk *clk, unsigned long rate)
+{
+ unsigned long parent = clk_get_rate(clk->parent);
+ u32 div;
+ u32 val;
+
+ if (rate < parent / (armclk_mask + 1))
+ return -EINVAL;
+
+ rate = clk_round_rate(clk, rate);
+ div = clk_get_rate(clk->parent) / rate;
+
+ val = __raw_readl(S3C_CLK_DIV0);
+ val &= armclk_mask;
+ val |= (div - 1);
+ __raw_writel(val, S3C_CLK_DIV0);
+
+ return 0;
+
+}
+
+static struct clk clk_arm = {
+ .name = "armclk",
+ .id = -1,
+ .parent = &clk_mout_apll.clk,
+ .get_rate = s3c64xx_clk_arm_get_rate,
+ .set_rate = s3c64xx_clk_arm_set_rate,
+ .round_rate = s3c64xx_clk_arm_round_rate,
+};
+
static unsigned long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
@@ -520,6 +579,33 @@ static struct clksrc_clk clk_irda = {
.reg_divider = S3C_CLK_DIV2,
};
+static struct clk *clkset_camif_list[] = {
+ &clk_h2,
+};
+
+static struct clk_sources clkset_camif = {
+ .sources = clkset_camif_list,
+ .nr_sources = ARRAY_SIZE(clkset_camif_list),
+};
+
+static struct clksrc_clk clk_camif = {
+ .clk = {
+ .name = "camera",
+ .id = -1,
+ .ctrlbit = S3C_CLKCON_SCLK_CAM,
+ .enable = s3c64xx_sclk_ctrl,
+ .set_parent = s3c64xx_setparent_clksrc,
+ .get_rate = s3c64xx_getrate_clksrc,
+ .set_rate = s3c64xx_setrate_clksrc,
+ .round_rate = s3c64xx_roundrate_clksrc,
+ },
+ .shift = 0,
+ .mask = 0,
+ .sources = &clkset_camif,
+ .divider_shift = S3C6400_CLKDIV0_CAM_SHIFT,
+ .reg_divider = S3C_CLK_DIV0,
+};
+
/* Clock initialisation code */
static struct clksrc_clk *init_parents[] = {
@@ -536,6 +622,7 @@ static struct clksrc_clk *init_parents[] = {
&clk_audio0,
&clk_audio1,
&clk_irda,
+ &clk_camif,
};
static void __init_or_cpufreq s3c6400_set_clksrc(struct clksrc_clk *clk)
@@ -608,6 +695,7 @@ void __init_or_cpufreq s3c6400_setup_clocks(void)
clk_fout_epll.rate = epll;
clk_fout_apll.rate = apll;
+ clk_h2.rate = hclk2;
clk_h.rate = hclk;
clk_p.rate = pclk;
clk_f.rate = fclk;
@@ -635,14 +723,30 @@ static struct clk *clks[] __initdata = {
&clk_audio0.clk,
&clk_audio1.clk,
&clk_irda.clk,
+ &clk_camif.clk,
+ &clk_arm,
};
-void __init s3c6400_register_clocks(void)
+/**
+ * s3c6400_register_clocks - register clocks for s3c6400 and above
+ * @armclk_divlimit: Divisor mask for ARMCLK
+ *
+ * Register the clocks for the S3C6400 and above SoC range, such
+ * as ARMCLK and the clocks which have divider chains attached.
+ *
+ * This call does not setup the clocks, which is left to the
+ * s3c6400_setup_clocks() call which may be needed by the cpufreq
+ * or resume code to re-set the clocks if the bootloader has changed
+ * them.
+ */
+void __init s3c6400_register_clocks(unsigned armclk_divlimit)
{
struct clk *clkp;
int ret;
int ptr;
+ armclk_mask = armclk_divlimit;
+
for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
clkp = clks[ptr];
ret = s3c24xx_register_clock(clkp);