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 --- Dependency on patch http://patchwork.ozlabs.org/patch/339164/ Changes for v2: - Changed patch heading
arch/powerpc/cpu/mpc85xx/cpu_init.c | 26 ++++++++++++++++++++++++++ include/fsl_usb.h | 5 +++++ 2 files changed, 31 insertions(+)
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c index 81aeadd..0e11a0b 100644 --- a/arch/powerpc/cpu/mpc85xx/cpu_init.c +++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c @@ -36,6 +36,29 @@
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) { @@ -716,6 +739,9 @@ 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, diff --git a/include/fsl_usb.h b/include/fsl_usb.h index 8b63cdd..1a6c9c1 100644 --- a/include/fsl_usb.h +++ b/include/fsl_usb.h @@ -48,6 +48,11 @@ struct ccsr_usb_phy { #define CONFIG_SYS_FSL_USB_PLLPRG2_PHY2_CLK_EN (1 << 0) #define CONFIG_SYS_FSL_USB_PLLPRG2_PHY1_CLK_EN (1 << 1) #define CONFIG_SYS_FSL_USB_PLLPRG2_FRAC_LPF_EN (1 << 13) +#ifdef CONFIG_SYS_FSL_SINGLE_SOURCE_CLK +#define CONFIG_SYS_FSL_USB_PLLPRG2_REF_DIV_INTERNAL_CLK (5 << 4) +#define CONFIG_SYS_FSL_USB_PLLPRG2_MFI_INTERNAL_CLK (6 << 16) +#define CONFIG_SYS_FSL_USB_INTERNAL_SOC_CLK_EN (1 << 20) +#endif #define CONFIG_SYS_FSL_USB_PLLPRG2_REF_DIV (1 << 4) #define CONFIG_SYS_FSL_USB_PLLPRG2_MFI (5 << 16) #define CONFIG_SYS_FSL_USB_PLLPRG2_PLL_EN (1 << 21)