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authorJohn Crispin <blogic@openwrt.org>2015-11-05 03:56:23 +0100
committerRalf Baechle <ralf@linux-mips.org>2015-11-11 08:38:24 +0100
commit08b3c894e56580b8ed3e601212a25bda974c3cc2 (patch)
tree925ec1e00898411c4e729ee661c1823791a24de8
parent9eb8c69e0b00d5e7970a682454180780b6a3d020 (diff)
downloadop-kernel-dev-08b3c894e56580b8ed3e601212a25bda974c3cc2.zip
op-kernel-dev-08b3c894e56580b8ed3e601212a25bda974c3cc2.tar.gz
MIPS: lantiq: Disable xbar fpi burst mode
Signed-off-by: John Crispin <blogic@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11458/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/lantiq/xway/sysctrl.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c
index 7b3a014..80554e8 100644
--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -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();
}
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