From: Ye Li ye.li@nxp.com
The normal target frequency for ULP A7 core is 500Mhz, but now ROM set the core frequency to 413Mhz. So change it to 500Mhz in u-boot.
Signed-off-by: Ye Li ye.li@nxp.com Signed-off-by: Peng Fan peng.fan@nxp.com --- arch/arm/include/asm/arch-mx7ulp/scg.h | 1 + arch/arm/mach-imx/mx7ulp/clock.c | 2 ++ arch/arm/mach-imx/mx7ulp/scg.c | 41 ++++++++++++++++++++++++++++++++++ 3 files changed, 44 insertions(+)
diff --git a/arch/arm/include/asm/arch-mx7ulp/scg.h b/arch/arm/include/asm/arch-mx7ulp/scg.h index f1fae010da..531d8f3a95 100644 --- a/arch/arm/include/asm/arch-mx7ulp/scg.h +++ b/arch/arm/include/asm/arch-mx7ulp/scg.h @@ -337,5 +337,6 @@ void scg_a7_nicclk_init(void); void scg_a7_sys_clk_sel(enum scg_sys_src clk); void scg_a7_info(void); void scg_a7_soscdiv_init(void); +void scg_a7_init_core_clk(void);
#endif diff --git a/arch/arm/mach-imx/mx7ulp/clock.c b/arch/arm/mach-imx/mx7ulp/clock.c index 6d6697ad99..65d7fcfa39 100644 --- a/arch/arm/mach-imx/mx7ulp/clock.c +++ b/arch/arm/mach-imx/mx7ulp/clock.c @@ -300,6 +300,8 @@ void clock_init(void)
scg_a7_soscdiv_init();
+ scg_a7_init_core_clk(); + /* APLL PFD1 = 270Mhz, PFD2=345.6Mhz, PFD3=800Mhz */ scg_enable_pll_pfd(SCG_APLL_PFD1_CLK, 35); scg_enable_pll_pfd(SCG_APLL_PFD2_CLK, 28); diff --git a/arch/arm/mach-imx/mx7ulp/scg.c b/arch/arm/mach-imx/mx7ulp/scg.c index a28a2bc81b..0d31352c77 100644 --- a/arch/arm/mach-imx/mx7ulp/scg.c +++ b/arch/arm/mach-imx/mx7ulp/scg.c @@ -1091,3 +1091,44 @@ void scg_a7_info(void) debug("SCG RCCR Value: 0x%x\n", readl(&scg1_regs->rccr)); debug("SCG Clock Status: 0x%x\n", readl(&scg1_regs->csr)); } + +void scg_a7_init_core_clk(void) +{ + u32 val = 0; + + /* + * The normal target frequency for ULP B0 is 500Mhz, + * but ROM set it to 413Mhz, need to change SPLL PFD0 FRAC + */ + if (soc_rev() >= CHIP_REV_2_0) { + /* Switch RCCR SCG to SOSC, firstly check the SOSC is valid */ + if ((readl(&scg1_regs->sosccsr) & SCG_SOSC_CSR_SOSCVLD_MASK)) { + val = readl(&scg1_regs->rccr); + val &= (~SCG_CCR_SCS_MASK); + val |= ((SCG_SCS_SYS_OSC) << SCG_CCR_SCS_SHIFT); + writel(val, &scg1_regs->rccr); + + /* Switch the PLLS to SPLL clk */ + val = readl(&scg1_regs->spllcfg); + val &= ~SCG_PLL_CFG_PLLSEL_MASK; + writel(val, &scg1_regs->spllcfg); + + /* + * Re-configure PFD0 to 19, + * A7 SPLL(528MHz) * 18 / 19 = 500MHz + */ + scg_enable_pll_pfd(SCG_SPLL_PFD0_CLK, 19); + + /* Switch the PLLS to SPLL PFD0 */ + val = readl(&scg1_regs->spllcfg); + val |= SCG_PLL_CFG_PLLSEL_MASK; + writel(val, &scg1_regs->spllcfg); + + /* Set RCCR SCG to SPLL clk out */ + val = readl(&scg1_regs->rccr); + val &= (~SCG_CCR_SCS_MASK); + val |= ((SCG_SCS_SYS_PLL) << SCG_CCR_SCS_SHIFT); + writel(val, &scg1_regs->rccr); + } + } +}