Differential D24207 Diff 69938 sys/arm/xilinx/zy7_slcr.c

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sys/arm/xilinx/zy7_slcr.c

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	/* Override cgem_set_refclk() in gigabit ethernet driver			/* Override cgem_set_refclk() in gigabit ethernet driver
	* (sys/dev/cadence/if_cgem.c). This function is called to			* (sys/dev/cadence/if_cgem.c). This function is called to
	* request a change in the gem's reference clock speed.			* request a change in the gem's reference clock speed.
	*/			*/
	int			int
	cgem_set_ref_clk(int unit, int frequency)			cgem_set_ref_clk(int unit, int frequency)
	{			{
	struct zy7_slcr_softc *sc = zy7_slcr_softc_p;			struct zy7_slcr_softc *sc = zy7_slcr_softc_p;
				int clk_reg_val, base_frequency;
	int div0, div1;			int div0, div1;

	if (!sc)			if (!sc)
	return (-1);			return (-1);

				clk_reg_val = RD4(sc, unit ? ZY7_SLCR_GEM1_CLK_CTRL :
				ZY7_SLCR_GEM0_CLK_CTRL);
				switch (clk_reg_val & ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_MASK) {
				case ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_EMIO_CLK:
				/* Do not touch clock divisors if clock is from EMIO. */
				return (0);
				case ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_ARM_PLL:
				base_frequency = arm_pll_frequency;
				break;
				case ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_DDR_PLL:
				base_frequency = ddr_pll_frequency;
				break;
				case ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_IO_PLL:
				default:
				base_frequency = io_pll_frequency;
				break;
				}

	/* Find suitable divisor pairs. Round result to nearest khz			/* Find suitable divisor pairs. Round result to nearest khz
	* to test for match.			* to test for match.
	*/			*/
	for (div1 = 1; div1 <= ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MAX; div1++) {			for (div1 = 1; div1 <= ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MAX; div1++) {
	div0 = (io_pll_frequency + div1 * frequency / 2) /			div0 = (base_frequency + div1 * frequency / 2) /
	div1 / frequency;			div1 / frequency;
	if (div0 > 0 && div0 <= ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_MAX &&			if (div0 > 0 && div0 <= ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_MAX &&
	((io_pll_frequency / div0 / div1) + 500) / 1000 ==			((base_frequency / div0 / div1) + 500) / 1000 ==
	(frequency + 500) / 1000)			(frequency + 500) / 1000)
	break;			break;
	}			}

	if (div1 > ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MAX)			if (div1 > ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MAX)
	return (-1);			return (-1);

	ZSLCR_LOCK(sc);			ZSLCR_LOCK(sc);

	/* Unlock SLCR registers. */			/* Unlock SLCR registers. */
	zy7_slcr_unlock(sc);			zy7_slcr_unlock(sc);

	/* Modify GEM reference clock. */			/* Modify GEM reference clock divisors. */
				clk_reg_val &= ~(ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_MASK \|
				ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_MASK);
	WR4(sc, unit ? ZY7_SLCR_GEM1_CLK_CTRL : ZY7_SLCR_GEM0_CLK_CTRL,			WR4(sc, unit ? ZY7_SLCR_GEM1_CLK_CTRL : ZY7_SLCR_GEM0_CLK_CTRL,
	(div1 << ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_SHIFT) \|			clk_reg_val \| (div1 << ZY7_SLCR_GEM_CLK_CTRL_DIVISOR1_SHIFT) \|
	(div0 << ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_SHIFT) \|			(div0 << ZY7_SLCR_GEM_CLK_CTRL_DIVISOR_SHIFT));
	ZY7_SLCR_GEM_CLK_CTRL_SRCSEL_IO_PLL \|
	ZY7_SLCR_GEM_CLK_CTRL_CLKACT);

	/* Lock SLCR registers. */			/* Lock SLCR registers. */
	zy7_slcr_lock(sc);			zy7_slcr_lock(sc);

	ZSLCR_UNLOCK(sc);			ZSLCR_UNLOCK(sc);

	return (0);			return (0);
	}			}
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