mx5: change usb clock source from pll3 to pll2
For power management reasons, pll2 should be used to source the USBOH3
clock for mx51. PLL3 can be completely gated off when USB is not used.
This patch applies to 2.6.34-rc7.
Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx5/clock-mx51.c b/arch/arm/mach-mx5/clock-mx51.c
index dcca330..566cfda 100644
--- a/arch/arm/mach-mx5/clock-mx51.c
+++ b/arch/arm/mach-mx5/clock-mx51.c
@@ -36,6 +36,7 @@
static struct clk periph_apm_clk;
static struct clk ahb_clk;
static struct clk ipg_clk;
+static struct clk usboh3_clk;
#define MAX_DPLL_WAIT_TRIES 1000 /* 1000 * udelay(1) = 1ms */
@@ -569,6 +570,35 @@
return 0;
}
+static unsigned long clk_usboh3_get_rate(struct clk *clk)
+{
+ u32 reg, prediv, podf;
+ unsigned long parent_rate;
+
+ parent_rate = clk_get_rate(clk->parent);
+
+ reg = __raw_readl(MXC_CCM_CSCDR1);
+ prediv = ((reg & MXC_CCM_CSCDR1_USBOH3_CLK_PRED_MASK) >>
+ MXC_CCM_CSCDR1_USBOH3_CLK_PRED_OFFSET) + 1;
+ podf = ((reg & MXC_CCM_CSCDR1_USBOH3_CLK_PODF_MASK) >>
+ MXC_CCM_CSCDR1_USBOH3_CLK_PODF_OFFSET) + 1;
+
+ return parent_rate / (prediv * podf);
+}
+
+static int _clk_usboh3_set_parent(struct clk *clk, struct clk *parent)
+{
+ u32 reg, mux;
+
+ mux = _get_mux(parent, &pll1_sw_clk, &pll2_sw_clk, &pll3_sw_clk,
+ &lp_apm_clk);
+ reg = __raw_readl(MXC_CCM_CSCMR1) & ~MXC_CCM_CSCMR1_USBOH3_CLK_SEL_MASK;
+ reg |= mux << MXC_CCM_CSCMR1_USBOH3_CLK_SEL_OFFSET;
+ __raw_writel(reg, MXC_CCM_CSCMR1);
+
+ return 0;
+}
+
static unsigned long get_high_reference_clock_rate(struct clk *clk)
{
return external_high_reference;
@@ -690,6 +720,12 @@
.set_parent = _clk_uart_set_parent,
};
+static struct clk usboh3_clk = {
+ .parent = &pll2_sw_clk,
+ .get_rate = clk_usboh3_get_rate,
+ .set_parent = _clk_usboh3_set_parent,
+};
+
static struct clk ahb_max_clk = {
.parent = &ahb_clk,
.enable_reg = MXC_CCM_CCGR0,
@@ -761,10 +797,6 @@
DEFINE_CLOCK(gpt_ipg_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG10_OFFSET,
NULL, NULL, &ipg_clk, NULL);
-/* USB */
-DEFINE_CLOCK(usboh3_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG14_OFFSET,
- NULL, NULL, &pll3_sw_clk, NULL);
-
/* FEC */
DEFINE_CLOCK(fec_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG12_OFFSET,
NULL, NULL, &ipg_clk, NULL);
@@ -826,6 +858,9 @@
clk_enable(&cpu_clk);
clk_enable(&main_bus_clk);
+ /* set the usboh3_clk parent to pll2_sw_clk */
+ clk_set_parent(&usboh3_clk, &pll2_sw_clk);
+
/* System timer */
mxc_timer_init(&gpt_clk, MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR),
MX51_MXC_INT_GPT);