[PATCH 18/19] ipmi: kcs_bmc_aspeed: Implement KCS SerIRQ configuration
From: Andrew Jeffery
Date: Fri Feb 19 2021 - 09:32:15 EST
Apply the SerIRQ ID and level/sense behaviours from the devicetree if
provided.
Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
---
drivers/char/ipmi/kcs_bmc_aspeed.c | 126 +++++++++++++++++++++++++++++
1 file changed, 126 insertions(+)
diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
index 17afe9449e72..649d795a5a75 100644
--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
@@ -9,6 +9,7 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -39,6 +40,20 @@
#define LPC_HICR4 0x010
#define LPC_HICR4_LADR12AS BIT(7)
#define LPC_HICR4_KCSENBL BIT(2)
+#define LPC_SIRQCR2 0x078
+#define LPC_SIRQCR2_SEL1IRQX BIT(13)
+#define LPC_SIRQCR2_IRQXE1 BIT(12)
+#define LPC_SIRQCR2_ID1IRQX_MASK GENMASK(11, 8)
+#define LPC_SIRQCR2_ID1IRQX_SHIFT 8
+#define LPC_HICR5 0x080
+#define LPC_HICR5_ID3IRQX_MASK GENMASK(23, 20)
+#define LPC_HICR5_ID3IRQX_SHIFT 20
+#define LPC_HICR5_ID2IRQX_MASK GENMASK(19, 16)
+#define LPC_HICR5_ID2IRQX_SHIFT 16
+#define LPC_HICR5_SEL3IRQX BIT(15)
+#define LPC_HICR5_IRQXE3 BIT(14)
+#define LPC_HICR5_SEL2IRQX BIT(13)
+#define LPC_HICR5_IRQXE2 BIT(12)
#define LPC_LADR3H 0x014
#define LPC_LADR3L 0x018
#define LPC_LADR12H 0x01C
@@ -55,6 +70,17 @@
#define LPC_HICRB 0x100
#define LPC_HICRB_IBFIF4 BIT(1)
#define LPC_HICRB_LPC4E BIT(0)
+#define LPC_HICRC 0x104
+#define LPC_HICRC_ID4IRQX_MASK GENMASK(7, 4)
+#define LPC_HICRC_ID4IRQX_SHIFT 4
+#define LPC_HICRC_TY4IRQX_MASK GENMASK(3, 2)
+#define LPC_HICRC_TY4IRQX_SHIFT 2
+#define LPC_HICRC_TY4IRQX_LOW 0b00
+#define LPC_HICRC_TY4IRQX_HIGH 0b01
+#define LPC_HICRC_TY4IRQX_RSVD 0b10
+#define LPC_HICRC_TY4IRQX_RISING 0b11
+#define LPC_HICRC_OBF4_AUTO_CLR BIT(1)
+#define LPC_HICRC_IRQXE4 BIT(0)
#define LPC_LADR4 0x110
#define LPC_IDR4 0x114
#define LPC_ODR4 0x118
@@ -99,10 +125,37 @@ static u8 aspeed_kcs_inb(struct kcs_bmc_device *kcs_bmc, u32 reg)
static void aspeed_kcs_outb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 data)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
+ unsigned int ier;
int rc;
rc = regmap_write(priv->map, reg, data);
WARN(rc != 0, "regmap_write() failed: %d\n", rc);
+
+ /* Trigger the SerIRQ on ODR writes if enabled */
+ switch (kcs_bmc->channel) {
+ case 1:
+ regmap_read(priv->map, LPC_SIRQCR2, &ier);
+ if (reg == LPC_ODR1 && (ier & LPC_SIRQCR2_SEL1IRQX))
+ regmap_write(priv->map, LPC_SIRQCR2, ier | LPC_SIRQCR2_IRQXE1);
+ break;
+ case 2:
+ regmap_read(priv->map, LPC_HICR5, &ier);
+ if (reg == LPC_ODR2 && (ier & LPC_HICR5_SEL2IRQX))
+ regmap_write(priv->map, LPC_HICR5, ier | LPC_HICR5_IRQXE2);
+ break;
+ case 3:
+ regmap_read(priv->map, LPC_HICR5, &ier);
+ if (reg == LPC_ODR3 && (ier & LPC_HICR5_SEL3IRQX))
+ regmap_write(priv->map, LPC_HICR5, ier | LPC_HICR5_IRQXE3);
+ break;
+ case 4:
+ regmap_read(priv->map, LPC_HICRC, &ier);
+ if (reg == LPC_ODR4 && (ier & LPC_HICRC_ID4IRQX_MASK))
+ regmap_write(priv->map, LPC_HICRC, ier | LPC_HICRC_IRQXE4);
+ break;
+ default:
+ break;
+ }
}
static void aspeed_kcs_updateb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 mask, u8 val)
@@ -161,6 +214,66 @@ static void aspeed_kcs_set_address(struct kcs_bmc_device *kcs_bmc, u16 addr)
}
}
+static inline int aspeed_kcs_map_serirq_type(u32 dt_type)
+{
+ switch (dt_type) {
+ case IRQ_TYPE_EDGE_RISING:
+ return LPC_HICRC_TY4IRQX_RISING;
+ case IRQ_TYPE_LEVEL_HIGH:
+ return LPC_HICRC_TY4IRQX_HIGH;
+ case IRQ_TYPE_LEVEL_LOW:
+ return LPC_HICRC_TY4IRQX_LOW;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int aspeed_kcs_config_serirq(struct aspeed_kcs_bmc *priv, u32 id, u32 dt_type)
+{
+ unsigned int mask, val;
+
+ if (id > 15)
+ return -EINVAL;
+
+ switch (priv->kcs_bmc.channel) {
+ case 1:
+ mask = LPC_SIRQCR2_SEL1IRQX | LPC_SIRQCR2_ID1IRQX_MASK;
+ val = LPC_SIRQCR2_SEL1IRQX | (id << LPC_SIRQCR2_ID1IRQX_SHIFT);
+ regmap_update_bits(priv->map, LPC_SIRQCR2, mask, val);
+ break;
+ case 2:
+ mask = LPC_HICR5_SEL2IRQX | LPC_HICR5_ID2IRQX_MASK;
+ val = LPC_HICR5_SEL2IRQX | (id << LPC_HICR5_ID2IRQX_SHIFT);
+ regmap_update_bits(priv->map, LPC_HICR5, mask, val);
+ break;
+ case 3:
+ mask = LPC_HICR5_SEL3IRQX | LPC_HICR5_ID3IRQX_MASK;
+ val = LPC_HICR5_SEL3IRQX | (id << LPC_HICR5_ID3IRQX_SHIFT);
+ regmap_update_bits(priv->map, LPC_HICR5, mask, val);
+ break;
+ case 4:
+ {
+ unsigned int hw_type;
+
+ hw_type = aspeed_kcs_map_serirq_type(dt_type);
+ if (hw_type < 0)
+ return hw_type;
+
+ mask = LPC_HICRC_ID4IRQX_MASK | LPC_HICRC_TY4IRQX_MASK | LPC_HICRC_OBF4_AUTO_CLR;
+ val = (id << LPC_HICRC_ID4IRQX_SHIFT) | (hw_type << LPC_HICRC_TY4IRQX_SHIFT);
+ regmap_update_bits(priv->map, LPC_HICRC, mask, val);
+ break;
+ }
+ default:
+ dev_warn(priv->kcs_bmc.dev,
+ "SerIRQ configuration not supported on KCS channel %d\n",
+ priv->kcs_bmc.channel);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static void aspeed_kcs_enable_channel(struct kcs_bmc_device *kcs_bmc, bool enable)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
@@ -371,6 +484,8 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
struct aspeed_kcs_bmc *priv;
struct device_node *np;
int rc, channel, addr;
+ bool have_serirq;
+ u32 serirq[2];
np = pdev->dev.of_node->parent;
if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&
@@ -379,6 +494,7 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "unsupported LPC device binding\n");
return -ENODEV;
}
+
ops = of_device_get_match_data(&pdev->dev);
if (!ops)
return -EINVAL;
@@ -391,6 +507,12 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
if (addr < 0)
return addr;
+ rc = of_property_read_u32_array(pdev->dev.of_node, "aspeed,lpc-interrupts", serirq, 2);
+ if ((rc && rc != -EINVAL))
+ return -EINVAL;
+
+ have_serirq = !rc;
+
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -413,6 +535,9 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
aspeed_kcs_set_address(kcs_bmc, addr);
+ if (have_serirq)
+ aspeed_kcs_config_serirq(priv, serirq[0], serirq[1]);
+
rc = aspeed_kcs_config_irq(kcs_bmc, pdev);
if (rc)
return rc;
@@ -482,4 +607,5 @@ module_platform_driver(ast_kcs_bmc_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Haiyue Wang <haiyue.wang@xxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Andrew Jeffery <andrew@xxxxxxxx>");
MODULE_DESCRIPTION("Aspeed device interface to the KCS BMC device");
--
2.27.0