mx51: fix usb clock support

Current code doesn't really enable the usb clocks so if they're disabled
when booting linux, the kernel/machine will hang as soon as someone is trying
to read a usb register

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 43 insertions, 2 deletions

diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
index 9fc65bbc9d77..2f9eae213094 100644
--- a/arch/arm/mach-mx5/clock-mx51-mx53.c
+++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
@@ -954,6 +954,41 @@ static struct clk usboh3_clk = {
         .parent = &pll2_sw_clk,
         .get_rate = clk_usboh3_get_rate,
         .set_parent = clk_usboh3_set_parent,
+        .enable = _clk_ccgr_enable,
+        .disable = _clk_ccgr_disable,
+        .enable_reg = MXC_CCM_CCGR2,
+        .enable_shift = MXC_CCM_CCGRx_CG14_OFFSET,
+};
+
+static struct clk usb_ahb_clk = {
+        .parent = &ipg_clk,
+        .enable = _clk_ccgr_enable,
+        .disable = _clk_ccgr_disable,
+        .enable_reg = MXC_CCM_CCGR2,
+        .enable_shift = MXC_CCM_CCGRx_CG13_OFFSET,
+};
+
+static int clk_usb_phy1_set_parent(struct clk *clk, struct clk *parent)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_CSCMR1) & ~MXC_CCM_CSCMR1_USB_PHY_CLK_SEL;
+
+        if (parent == &pll3_sw_clk)
+                reg |= 1 << MXC_CCM_CSCMR1_USB_PHY_CLK_SEL_OFFSET;
+
+        __raw_writel(reg, MXC_CCM_CSCMR1);
+
+        return 0;
+}
+
+static struct clk usb_phy1_clk = {
+        .parent = &pll3_sw_clk,
+        .set_parent = clk_usb_phy1_set_parent,
+        .enable = _clk_ccgr_enable,
+        .enable_reg = MXC_CCM_CCGR2,
+        .enable_shift = MXC_CCM_CCGRx_CG0_OFFSET,
+        .disable = _clk_ccgr_disable,
 };
 
 /* eCSPI */
@@ -1094,9 +1129,12 @@ static struct clk_lookup mx51_lookups[] = {
         _REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
         _REGISTER_CLOCK("imx-i2c.2", NULL, hsi2c_clk)
         _REGISTER_CLOCK("mxc-ehci.0", "usb", usboh3_clk)
-        _REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", ahb_clk)
+        _REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", usb_ahb_clk)
+        _REGISTER_CLOCK("mxc-ehci.0", "usb_phy1", usb_phy1_clk)
         _REGISTER_CLOCK("mxc-ehci.1", "usb", usboh3_clk)
-        _REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", ahb_clk)
+        _REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", usb_ahb_clk)
+        _REGISTER_CLOCK("mxc-ehci.2", "usb", usboh3_clk)
+        _REGISTER_CLOCK("mxc-ehci.2", "usb_ahb", usb_ahb_clk)
         _REGISTER_CLOCK("fsl-usb2-udc", "usb", usboh3_clk)
         _REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", ahb_clk)
         _REGISTER_CLOCK("imx-keypad.0", NULL, kpp_clk)
@@ -1170,6 +1208,9 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
         mx51_revision();
         clk_disable(&iim_clk);
 
+        /* move usb_phy_clk to 24MHz */
+        clk_set_parent(&usb_phy1_clk, &osc_clk);
+
         /* set the usboh3_clk parent to pll2_sw_clk */
         clk_set_parent(&usboh3_clk, &pll2_sw_clk);