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Commit 08b3c894 authored by John Crispin's avatar John Crispin Committed by Ralf Baechle
Browse files

MIPS: lantiq: Disable xbar fpi burst mode 



Signed-off-by: default avatarJohn Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11458/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9eb8c69e

arch/mips/lantiq/xway/sysctrl.c

+41 −0
Original line number Diff line number Diff line
@@ -145,7 +145,15 @@ static u32 pmu_clk_cr_b[] = { 
#define pmu_w32(x, y)	ltq_w32((x), pmu_membase + (y))

#define pmu_r32(x)	ltq_r32(pmu_membase + (x))



#define XBAR_ALWAYS_LAST	0x430

#define XBAR_FPI_BURST_EN	BIT(1)

#define XBAR_AHB_BURST_EN	BIT(2)



#define xbar_w32(x, y)	ltq_w32((x), ltq_xbar_membase + (y))

#define xbar_r32(x)	ltq_r32(ltq_xbar_membase + (x))



static void __iomem *pmu_membase;

static void __iomem *ltq_xbar_membase;

void __iomem *ltq_cgu_membase;

void __iomem *ltq_ebu_membase;
@@ -285,6 +293,16 @@ static void pci_ext_disable(struct clk *clk) 
	ltq_cgu_w32((1 << 31) | (1 << 30), pcicr);

}



static void xbar_fpi_burst_disable(void)

{

	u32 reg;



	/* bit 1 as 1 --burst; bit 1 as 0 -- single */

	reg = xbar_r32(XBAR_ALWAYS_LAST);

	reg &= ~XBAR_FPI_BURST_EN;

	xbar_w32(reg, XBAR_ALWAYS_LAST);

}



/* enable a clockout source */

static int clkout_enable(struct clk *clk)

{
@@ -441,6 +459,26 @@ void __init ltq_soc_init(void) 
	if (!pmu_membase || !ltq_cgu_membase || !ltq_ebu_membase)

		panic("Failed to remap core resources");



	if (of_machine_is_compatible("lantiq,vr9")) {

		struct resource res_xbar;

		struct device_node *np_xbar =

				of_find_compatible_node(NULL, NULL,

							"lantiq,xbar-xway");



		if (!np_xbar)

			panic("Failed to load xbar nodes from devicetree");

		if (of_address_to_resource(np_pmu, 0, &res_xbar))

			panic("Failed to get xbar resources");

		if (request_mem_region(res_xbar.start, resource_size(&res_xbar),

			res_xbar.name) < 0)

			panic("Failed to get xbar resources");



		ltq_xbar_membase = ioremap_nocache(res_xbar.start,

						   resource_size(&res_xbar));

		if (!ltq_xbar_membase)

			panic("Failed to remap xbar resources");

	}



	/* make sure to unprotect the memory region where flash is located */

	ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
@@ -567,4 +605,7 @@ void __init ltq_soc_init(void) 
		clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE);

		clkdev_add_pmu("1e100400.serial", NULL, 1, 0, PMU_ASC0);

	}



	if (of_machine_is_compatible("lantiq,vr9"))

		xbar_fpi_burst_disable();

}