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SubjectRe: [PATCH v3 14/16] ipmi: kcs bmc aspeed: Implement KCS S erIRQ configuration


On Fri, 21 May 2021, at 16:51, Zev Weiss wrote:
> On Mon, May 10, 2021 at 12:42:11AM CDT, Andrew Jeffery wrote:
> >Apply the SerIRQ ID and level/sense behaviours from the devicetree if
> >provided.
> >
> >Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> >---
> > drivers/char/ipmi/kcs_bmc_aspeed.c | 182 ++++++++++++++++++++++++++++-
> > 1 file changed, 180 insertions(+), 2 deletions(-)
> >
> >diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
> >index 8a0b1e18e945..9b81806b4dcb 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>
> >@@ -28,6 +29,22 @@
> >
> > #define KCS_CHANNEL_MAX 4
> >
> >+/*
> >+ * Field class descriptions
> >+ *
> >+ * LPCyE Enable LPC channel y
> >+ * IBFIEy Input Buffer Full IRQ Enable for LPC channel y
> >+ * IRQxEy Assert SerIRQ x for LPC channel y (Deprecated, use IDyIRQX, IRQXEy)
> >+ * IDyIRQX Use the specified 4-bit SerIRQ for LPC channel y
> >+ * SELyIRQX SerIRQ polarity for LPC channel y (low: 0, high: 1)
> >+ * IRQXEy Assert the SerIRQ specified in IDyIRQX for LPC channel y
> >+ */
> >+
> >+#define LPC_TYIRQX_LOW 0b00
> >+#define LPC_TYIRQX_HIGH 0b01
> >+#define LPC_TYIRQX_RSVD 0b10
> >+#define LPC_TYIRQX_RISING 0b11
> >+
> > #define LPC_HICR0 0x000
> > #define LPC_HICR0_LPC3E BIT(7)
> > #define LPC_HICR0_LPC2E BIT(6)
> >@@ -39,6 +56,19 @@
> > #define LPC_HICR4 0x010
> > #define LPC_HICR4_LADR12AS BIT(7)
> > #define LPC_HICR4_KCSENBL BIT(2)
> >+#define LPC_SIRQCR0 0x070
> >+/* IRQ{12,1}E1 are deprecated as of AST2600 A3 but necessary for prior chips */
> >+#define LPC_SIRQCR0_IRQ12E1 BIT(1)
> >+#define LPC_SIRQCR0_IRQ1E1 BIT(0)
> >+#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 +85,13 @@
> > #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_OBF4_AUTO_CLR BIT(1)
> >+#define LPC_HICRC_IRQXE4 BIT(0)
> > #define LPC_LADR4 0x110
> > #define LPC_IDR4 0x114
> > #define LPC_ODR4 0x118
> >@@ -62,11 +99,21 @@
> >
> > #define OBE_POLL_PERIOD (HZ / 2)
> >
> >+enum aspeed_kcs_irq_mode {
> >+ aspeed_kcs_irq_none,
> >+ aspeed_kcs_irq_serirq,
> >+};
> >+
> > struct aspeed_kcs_bmc {
> > struct kcs_bmc_device kcs_bmc;
> >
> > struct regmap *map;
> >
> >+ struct {
> >+ enum aspeed_kcs_irq_mode mode;
> >+ int id;
> >+ } upstream_irq;
> >+
> > struct {
> > spinlock_t lock;
> > bool remove;
> >@@ -103,6 +150,49 @@ static void aspeed_kcs_outb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 data)
> >
> > rc = regmap_write(priv->map, reg, data);
> > WARN(rc != 0, "regmap_write() failed: %d\n", rc);
> >+
> >+ /* Trigger the upstream IRQ on ODR writes, if enabled */
> >+
> >+ switch (reg) {
> >+ case LPC_ODR1:
> >+ case LPC_ODR2:
> >+ case LPC_ODR3:
> >+ case LPC_ODR4:
> >+ break;
> >+ default:
> >+ return;
> >+ }
> >+
> >+ if (priv->upstream_irq.mode != aspeed_kcs_irq_serirq)
> >+ return;
> >+
> >+ switch (kcs_bmc->channel) {
> >+ case 1:
> >+ switch (priv->upstream_irq.id) {
> >+ case 12:
> >+ regmap_update_bits(priv->map, LPC_SIRQCR0, LPC_SIRQCR0_IRQ12E1,
> >+ LPC_SIRQCR0_IRQ12E1);
> >+ break;
> >+ case 1:
> >+ regmap_update_bits(priv->map, LPC_SIRQCR0, LPC_SIRQCR0_IRQ1E1,
> >+ LPC_SIRQCR0_IRQ1E1);
> >+ break;
> >+ default:
> >+ break;
> >+ }
> >+ break;
> >+ case 2:
> >+ regmap_update_bits(priv->map, LPC_HICR5, LPC_HICR5_IRQXE2, LPC_HICR5_IRQXE2);
> >+ break;
> >+ case 3:
> >+ regmap_update_bits(priv->map, LPC_HICR5, LPC_HICR5_IRQXE3, LPC_HICR5_IRQXE3);
> >+ break;
> >+ case 4:
> >+ regmap_update_bits(priv->map, LPC_HICRC, LPC_HICRC_IRQXE4, 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 +251,73 @@ 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_TYIRQX_RISING;
> >+ case IRQ_TYPE_LEVEL_HIGH:
> >+ return LPC_TYIRQX_HIGH;
> >+ case IRQ_TYPE_LEVEL_LOW:
> >+ return LPC_TYIRQX_LOW;
> >+ default:
> >+ return -EINVAL;
> >+ }
> >+}
> >+
> >+static int aspeed_kcs_config_upstream_irq(struct aspeed_kcs_bmc *priv, u32 id, u32 dt_type)
> >+{
> >+ unsigned int mask, val, hw_type;
> >+
> >+ if (id > 15)
> >+ return -EINVAL;
> >+
> >+ hw_type = aspeed_kcs_map_serirq_type(dt_type);
> >+ if (hw_type < 0)
> >+ return hw_type;
> >+
> >+ priv->upstream_irq.mode = aspeed_kcs_irq_serirq;
> >+ priv->upstream_irq.id = id;
> >+
> >+ switch (priv->kcs_bmc.channel) {
> >+ case 1:
> >+ /* Needs IRQxE1 rather than (ID1IRQX, SEL1IRQX, IRQXE1) before AST2600 A3 */
>
> I'm struggling a bit with understanding this comment, and relating it to
> the code -- it sounds like "we need to do things one way on A3 and
> later, and another way on pre-A3", but then...we just break without
> doing anything at all either way. Can you clarify any further?

Hah! You're struggling because it doesn't make any sense, the code's gone missing :/ I'll fix that up.

Unfortunately due to hardware/firmware limitations I wasn't able to test channel 1.

>
> >+ break;
> >+ case 2:
> >+ if (!(hw_type == LPC_TYIRQX_LOW || hw_type == LPC_TYIRQX_HIGH))
> >+ return -EINVAL;
> >+
> >+ mask = LPC_HICR5_SEL2IRQX | LPC_HICR5_ID2IRQX_MASK;
> >+ val = (id << LPC_HICR5_ID2IRQX_SHIFT);
> >+ val |= (hw_type == LPC_TYIRQX_HIGH) ? LPC_HICR5_SEL2IRQX : 0;
> >+ regmap_update_bits(priv->map, LPC_HICR5, mask, val);
> >+
> >+ break;
> >+ case 3:
> >+ if (!(hw_type == LPC_TYIRQX_LOW || hw_type == LPC_TYIRQX_HIGH))
> >+ return -EINVAL;
> >+
> >+ mask = LPC_HICR5_SEL3IRQX | LPC_HICR5_ID3IRQX_MASK;
> >+ val = (id << LPC_HICR5_ID3IRQX_SHIFT);
> >+ val |= (hw_type == LPC_TYIRQX_HIGH) ? LPC_HICR5_SEL3IRQX : 0;
> >+ regmap_update_bits(priv->map, LPC_HICR5, mask, val);
> >+
> >+ break;
> >+ case 4:
> >+ 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);
> >@@ -262,7 +419,7 @@ static irqreturn_t aspeed_kcs_irq(int irq, void *arg)
> > return kcs_bmc_handle_event(kcs_bmc);
> > }
> >
> >-static int aspeed_kcs_config_irq(struct kcs_bmc_device *kcs_bmc,
> >+static int aspeed_kcs_config_downstream_irq(struct kcs_bmc_device *kcs_bmc,
> > struct platform_device *pdev)
> > {
> > struct device *dev = &pdev->dev;
> >@@ -366,6 +523,8 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
> > struct aspeed_kcs_bmc *priv;
> > struct device_node *np;
> > int rc, channel, addr;
> >+ bool have_upstream_irq;
> >+ u32 upstream_irq[2];
> >
> > np = pdev->dev.of_node->parent;
> > if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&
> >@@ -374,6 +533,7 @@ 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;
> >@@ -386,6 +546,13 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
> > if (addr < 0)
> > return addr;
> >
> >+ np = pdev->dev.of_node;
> >+ rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", upstream_irq, 2);
> >+ if ((rc && rc != -EINVAL))
>
> I think we could probably get by with slightly fewer parens here...

Yeah, not sure what happened there :)

Andrew

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