[PATCH 7/8] x86/platform/UV: Initialize PCH GPP_D_0 NMI Pin to be NMI source

[Mike Travis <travis@sgi.com>]

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The initialize PCH NMI I/O function is separate and may be moved to BIOS
for security reasons.  This function detects whether the PCH NMI config
has already been done and if not, it will then initialize the PCH here.

Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Dimitri Sivanich <sivanich@hpe.com>
Reviewed-by: Russ Anderson <rja@hpe.com>
---
 arch/x86/platform/uv/uv_nmi.c |  128 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)

--- linux.orig/arch/x86/platform/uv/uv_nmi.c
+++ linux/arch/x86/platform/uv/uv_nmi.c
@@ -71,6 +71,7 @@ EXPORT_PER_CPU_SYMBOL_GPL(uv_cpu_nmi);
 static int *pch_base;
 #define	NMI_CONTROL_PORT	0x70
 #define	NMI_DUMMY_PORT		0x71
+#define	PAD_OWN_GPP_D_0		0x2c
 #define	GPI_NMI_STS_GPP_D_0	0x164
 #define	GPI_NMI_ENA_GPP_D_0	0x174
 #define	STS_GPP_D_0_MASK	0x1
@@ -161,6 +162,9 @@ static bool uv_pch_intr_enable = true;
 static bool uv_pch_intr_now_enabled;
 module_param_named(pch_intr_enable, uv_pch_intr_enable, bool, 0644);
 
+static bool uv_pch_init_enable = true;
+module_param_named(pch_init_enable, uv_pch_init_enable, bool, 0644);
+
 static int uv_nmi_debug;
 module_param_named(debug, uv_nmi_debug, int, 0644);
 
@@ -309,6 +313,127 @@ static void uv_nmi_setup_hubless_intr(vo
 		uv_pch_intr_now_enabled ? "enabled" : "disabled");
 }
 
+static struct init_nmi {
+	unsigned int	offset;
+	unsigned int	mask;
+	unsigned int	data;
+} init_nmi[] = {
+	{	/* HOSTSW_OWN_GPP_D_0 */
+	.offset = 0x84,
+	.mask = 0x1,
+	.data = 0x0,	/* ACPI Mode */
+	},
+
+/* clear status */
+	{	/* GPI_INT_STS_GPP_D_0 */
+	.offset = 0x104,
+	.mask = 0x0,
+	.data = 0x1,	/* Clear Status */
+	},
+	{	/* GPI_GPE_STS_GPP_D_0 */
+	.offset = 0x124,
+	.mask = 0x0,
+	.data = 0x1,	/* Clear Status */
+	},
+	{	/* GPI_SMI_STS_GPP_D_0 */
+	.offset = 0x144,
+	.mask = 0x0,
+	.data = 0x1,	/* Clear Status */
+	},
+	{	/* GPI_NMI_STS_GPP_D_0 */
+	.offset = 0x164,
+	.mask = 0x0,
+	.data = 0x1,	/* Clear Status */
+	},
+
+/* disable interrupts */
+	{	/* GPI_INT_EN_GPP_D_0 */
+	.offset = 0x114,
+	.mask = 0x1,
+	.data = 0x0,	/* disable interrupt generation */
+	},
+	{	/* GPI_GPE_EN_GPP_D_0 */
+	.offset = 0x134,
+	.mask = 0x1,
+	.data = 0x0,	/* disable interrupt generation */
+	},
+	{	/* GPI_SMI_EN_GPP_D_0 */
+	.offset = 0x154,
+	.mask = 0x1,
+	.data = 0x0,	/* disable interrupt generation */
+	},
+	{	/* GPI_NMI_EN_GPP_D_0 */
+	.offset = 0x174,
+	.mask = 0x1,
+	.data = 0x0,	/* disable interrupt generation */
+	},
+
+/* setup GPP_D_0 Pad Config */
+	{	/* PAD_CFG_DW0_GPP_D_0 */
+	.offset = 0x4c0,
+	.mask = 0xffffffff,
+	.data = 0x82020100,
+/*
+ *  31:30 Pad Reset Config (PADRSTCFG): = 2h  # PLTRST# (default)
+ *
+ *  29    RX Pad State Select (RXPADSTSEL): = 0 # Raw RX pad state directly
+ *                                                from RX buffer (default)
+ *
+ *  28    RX Raw Override to '1' (RXRAW1): = 0 # No Override
+ *
+ *  26:25 RX Level/Edge Configuration (RXEVCFG):
+ *      = 0h # Level
+ *      = 1h # Edge
+ *
+ *  23    RX Invert (RXINV): = 0 # No Inversion (signal active high)
+ *
+ *  20    GPIO Input Route IOxAPIC (GPIROUTIOXAPIC):
+ * = 0 # Routing does not cause peripheral IRQ...
+ *     # (we want an NMI not an IRQ)
+ *
+ *  19    GPIO Input Route SCI (GPIROUTSCI): = 0 # Routing does not cause SCI.
+ *  18    GPIO Input Route SMI (GPIROUTSMI): = 0 # Routing does not cause SMI.
+ *  17    GPIO Input Route NMI (GPIROUTNMI): = 1 # Routing can cause NMI.
+ *
+ *  11:10 Pad Mode (PMODE1/0): = 0h = GPIO control the Pad.
+ *   9    GPIO RX Disable (GPIORXDIS):
+ * = 0 # Enable the input buffer (active low enable)
+ *
+ *   8    GPIO TX Disable (GPIOTXDIS):
+ * = 1 # Disable the output buffer; i.e. Hi-Z
+ *
+ *   1 GPIO RX State (GPIORXSTATE): This is the current internal RX pad state..
+ *   0 GPIO TX State (GPIOTXSTATE):
+ * = 0 # (Leave at default)
+ */
+	},
+
+/* Pad Config DW1 */
+	{	/* PAD_CFG_DW1_GPP_D_0 */
+	.offset = 0x4c4,
+	.mask = 0x3c00,
+	.data = 0,	/* Termination = none (default) */
+	},
+};
+
+static void uv_init_hubless_pch_d0(void)
+{
+	int i, read;
+
+	read = *PCH_PCR_GPIO_ADDRESS(PAD_OWN_GPP_D_0);
+	if (read != 0) {
+		pr_info("UV: Hubless NMI already configured\n");
+		return;
+	}
+
+	nmi_debug("UV: Initializing UV Hubless NMI on PCH\n");
+	for (i = 0; i < ARRAY_SIZE(init_nmi); i++) {
+		uv_init_hubless_pch_io(init_nmi[i].offset,
+					init_nmi[i].mask,
+					init_nmi[i].data);
+	}
+}
+
 static int uv_nmi_test_hubless(struct uv_hub_nmi_s *hub_nmi)
 {
 	int *pstat = PCH_PCR_GPIO_ADDRESS(GPI_NMI_STS_GPP_D_0);
@@ -939,6 +1064,9 @@ void __init uv_nmi_setup_hubless(void)
 	nmi_debug("UV: PCH base:%p from 0x%lx, GPP_D_0\n",
 		pch_base, PCH_PCR_GPIO_1_BASE);
 
+	if (uv_pch_init_enable)
+		uv_init_hubless_pch_d0();
+
 	uv_init_hubless_pch_io(GPI_NMI_ENA_GPP_D_0,
 				STS_GPP_D_0_MASK, STS_GPP_D_0_MASK);
 

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