| Message ID | 1440063743-22838-2-git-send-email-thierry.reding@gmail.com |
|---|---|
| State | Accepted |
| Delegated to: | Tom Warren |
| Headers | show |
On 08/20/2015 03:42 AM, Thierry Reding wrote: > From: Thierry Reding <treding@nvidia.com> > > On currently supported SoCs, clk_m always runs at the same frequency as > the oscillator input. However newer SoC generations such as Tegra210 no > longer have that restriction. Prepare for that by separating clk_m from > the oscillator clock and allow SoC code to override the clk_m rate. > diff --git a/arch/arm/include/asm/arch-tegra114/clock-tables.h b/arch/arm/include/asm/arch-tegra114/clock-tables.h > index d8fa0e1d2cee..3f910f5ae8b9 100644 > --- a/arch/arm/include/asm/arch-tegra114/clock-tables.h > +++ b/arch/arm/include/asm/arch-tegra114/clock-tables.h > @@ -38,6 +38,7 @@ enum clock_id { > /* These are the base clocks (inputs to the Tegra SOC) */ > CLOCK_ID_32KHZ, > CLOCK_ID_OSC, > + CLOCK_ID_CLK_M, > > CLOCK_ID_COUNT, /* number of PLLs */ > CLOCK_ID_DISPLAY2, /* placeholder */ clock.h contains the following: /* Number of PLL-based clocks (i.e. not OSC or 32KHz) */ #define CLOCK_ID_PLL_COUNT (CLOCK_ID_COUNT - 2) ... which would need to be updated. Related, see internal bug number 1676978 to see if any of the other gotchas there affect this patch.
diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h index d570d7f134a8..eb07c4a07522 100644 --- a/arch/arm/include/asm/arch-tegra/clock.h +++ b/arch/arm/include/asm/arch-tegra/clock.h @@ -44,6 +44,9 @@ enum { /* return the current oscillator clock frequency */ enum clock_osc_freq clock_get_osc_freq(void); +/* return the clk_m frequency */ +unsigned int clk_m_get_rate(unsigned int parent_rate); + /** * Start PLL using the provided configuration parameters. * diff --git a/arch/arm/include/asm/arch-tegra114/clock-tables.h b/arch/arm/include/asm/arch-tegra114/clock-tables.h index d8fa0e1d2cee..3f910f5ae8b9 100644 --- a/arch/arm/include/asm/arch-tegra114/clock-tables.h +++ b/arch/arm/include/asm/arch-tegra114/clock-tables.h @@ -38,6 +38,7 @@ enum clock_id { /* These are the base clocks (inputs to the Tegra SOC) */ CLOCK_ID_32KHZ, CLOCK_ID_OSC, + CLOCK_ID_CLK_M, CLOCK_ID_COUNT, /* number of PLLs */ CLOCK_ID_DISPLAY2, /* placeholder */ diff --git a/arch/arm/include/asm/arch-tegra124/clock-tables.h b/arch/arm/include/asm/arch-tegra124/clock-tables.h index 3c67e72afe89..9466b4ffb33e 100644 --- a/arch/arm/include/asm/arch-tegra124/clock-tables.h +++ b/arch/arm/include/asm/arch-tegra124/clock-tables.h @@ -30,6 +30,7 @@ enum clock_id { /* These are the base clocks (inputs to the Tegra SoC) */ CLOCK_ID_32KHZ, CLOCK_ID_OSC, + CLOCK_ID_CLK_M, CLOCK_ID_COUNT, /* number of PLLs */ diff --git a/arch/arm/include/asm/arch-tegra20/clock-tables.h b/arch/arm/include/asm/arch-tegra20/clock-tables.h index 894be088cde2..812e8760d0cd 100644 --- a/arch/arm/include/asm/arch-tegra20/clock-tables.h +++ b/arch/arm/include/asm/arch-tegra20/clock-tables.h @@ -29,6 +29,7 @@ enum clock_id { /* These are the base clocks (inputs to the Tegra SOC) */ CLOCK_ID_32KHZ, CLOCK_ID_OSC, + CLOCK_ID_CLK_M, CLOCK_ID_COUNT, /* number of clocks */ CLOCK_ID_NONE = -1, diff --git a/arch/arm/include/asm/arch-tegra210/clock-tables.h b/arch/arm/include/asm/arch-tegra210/clock-tables.h index 175040dae618..a612485d8e23 100644 --- a/arch/arm/include/asm/arch-tegra210/clock-tables.h +++ b/arch/arm/include/asm/arch-tegra210/clock-tables.h @@ -30,6 +30,7 @@ enum clock_id { /* These are the base clocks (inputs to the Tegra SoC) */ CLOCK_ID_32KHZ, CLOCK_ID_OSC, + CLOCK_ID_CLK_M, CLOCK_ID_COUNT, /* number of PLLs */ diff --git a/arch/arm/include/asm/arch-tegra30/clock-tables.h b/arch/arm/include/asm/arch-tegra30/clock-tables.h index cb619f1f2d61..f7c7af80faaf 100644 --- a/arch/arm/include/asm/arch-tegra30/clock-tables.h +++ b/arch/arm/include/asm/arch-tegra30/clock-tables.h @@ -38,6 +38,7 @@ enum clock_id { /* These are the base clocks (inputs to the Tegra SOC) */ CLOCK_ID_32KHZ, CLOCK_ID_OSC, + CLOCK_ID_CLK_M, CLOCK_ID_COUNT, /* number of PLLs */ CLOCK_ID_DISPLAY2, /* Tegra3, placeholder */ diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index f9dfcd04115a..41e7de95a2e3 100644 --- a/arch/arm/mach-tegra/clock.c +++ b/arch/arm/mach-tegra/clock.c @@ -461,6 +461,11 @@ void reset_cmplx_set_enable(int cpu, int which, int reset) writel(mask, &clkrst->crc_cpu_cmplx_clr); } +unsigned int __weak clk_m_get_rate(unsigned int parent_rate) +{ + return parent_rate; +} + unsigned clock_get_rate(enum clock_id clkid) { struct clk_pll *pll; @@ -472,6 +477,9 @@ unsigned clock_get_rate(enum clock_id clkid) if (clkid == CLOCK_ID_OSC) return parent_rate; + if (clkid == CLOCK_ID_CLK_M) + return clk_m_get_rate(parent_rate); + pll = get_pll(clkid); if (!pll) return 0; @@ -613,8 +621,10 @@ void clock_init(void) pll_rate[CLOCK_ID_XCPU] = clock_get_rate(CLOCK_ID_XCPU); pll_rate[CLOCK_ID_SFROM32KHZ] = 32768; pll_rate[CLOCK_ID_OSC] = clock_get_rate(CLOCK_ID_OSC); + pll_rate[CLOCK_ID_CLK_M] = clock_get_rate(CLOCK_ID_CLK_M); debug("Osc = %d\n", pll_rate[CLOCK_ID_OSC]); + debug("CLKM = %d\n", pll_rate[CLOCK_ID_CLK_M]); debug("PLLC = %d\n", pll_rate[CLOCK_ID_CGENERAL]); debug("PLLM = %d\n", pll_rate[CLOCK_ID_MEMORY]); debug("PLLP = %d\n", pll_rate[CLOCK_ID_PERIPH]); diff --git a/arch/arm/mach-tegra/tegra210/clock.c b/arch/arm/mach-tegra/tegra210/clock.c index 830a33ffc938..146bb6453a19 100644 --- a/arch/arm/mach-tegra/tegra210/clock.c +++ b/arch/arm/mach-tegra/tegra210/clock.c @@ -998,6 +998,17 @@ void clock_early_init(void) udelay(2); } +unsigned int clk_m_get_rate(unsigned parent_rate) +{ + struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; + u32 value, div; + + value = readl(&clkrst->crc_spare_reg0); + div = ((value >> 2) & 0x3) + 1; + + return parent_rate / div; +} + void arch_timer_init(void) { struct sysctr_ctlr *sysctr = (struct sysctr_ctlr *)NV_PA_TSC_BASE;