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authorNikhil Badola <nikhil.badola@freescale.com>2014-04-15 14:44:52 +0530
committerYork Sun <yorksun@freescale.com>2014-04-22 17:58:52 -0700
commitd1c561cd546353686b28199bf9a90810805c7ada (patch)
treeef8eec407305f50ef8cdca0d1830496d6e82a5c2 /arch
parent0c12a1592c49c4fccea1df3eac9bf769aa1bd503 (diff)
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powerpc/mpc85xx: Add Differential SYSCLK config support T1040
Adds support for clock sourcing from sysclk(100MHz) for usb on T104xRDB and T1040QDS. This requires changing reference divisor and multiplication factor to derive usb clock from sysclk. Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/cpu/mpc85xx/cpu_init.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index a2b79cc..36ef232 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -39,6 +39,29 @@
DECLARE_GLOBAL_DATA_PTR;
+#ifdef CONFIG_SYS_FSL_SINGLE_SOURCE_CLK
+/*
+ * For deriving usb clock from 100MHz sysclk, reference divisor is set
+ * to a value of 5, which gives an intermediate value 20(100/5). The
+ * multiplication factor integer is set to 24, which when multiplied to
+ * above intermediate value provides clock for usb ip.
+ */
+void usb_single_source_clk_configure(struct ccsr_usb_phy *usb_phy)
+{
+ sys_info_t sysinfo;
+
+ get_sys_info(&sysinfo);
+ if (sysinfo.diff_sysclk == 1) {
+ clrbits_be32(&usb_phy->pllprg[1],
+ CONFIG_SYS_FSL_USB_PLLPRG2_MFI);
+ setbits_be32(&usb_phy->pllprg[1],
+ CONFIG_SYS_FSL_USB_PLLPRG2_REF_DIV_INTERNAL_CLK |
+ CONFIG_SYS_FSL_USB_PLLPRG2_MFI_INTERNAL_CLK |
+ CONFIG_SYS_FSL_USB_INTERNAL_SOC_CLK_EN);
+ }
+}
+#endif
+
#ifdef CONFIG_SYS_FSL_ERRATUM_A006261
void fsl_erratum_a006261_workaround(struct ccsr_usb_phy __iomem *usb_phy)
{
@@ -815,6 +838,9 @@ skip_l2:
CONFIG_SYS_FSL_USB_PLLPRG2_PHY1_CLK_EN |
CONFIG_SYS_FSL_USB_PLLPRG2_MFI |
CONFIG_SYS_FSL_USB_PLLPRG2_PLL_EN);
+#ifdef CONFIG_SYS_FSL_SINGLE_SOURCE_CLK
+ usb_single_source_clk_configure(usb_phy);
+#endif
setbits_be32(&usb_phy->port1.ctrl,
CONFIG_SYS_FSL_USB_CTRL_PHY_EN);
setbits_be32(&usb_phy->port1.drvvbuscfg,