This adds the Microwatt specific bits, including interrupt support. Signed-off-by: Anton Blanchard <an...@ozlabs.org> --- .../devicetree/bindings/ipmi/ibt-bmc.txt | 1 + drivers/char/ipmi/Kconfig | 8 ++- drivers/char/ipmi/bt-bmc.c | 69 +++++++++++++++++++ 3 files changed, 75 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/ipmi/ibt-bmc.txt b/Documentation/devicetree/bindings/ipmi/ibt-bmc.txt index 78ee716a950e..1b661daf0193 100644 --- a/Documentation/devicetree/bindings/ipmi/ibt-bmc.txt +++ b/Documentation/devicetree/bindings/ipmi/ibt-bmc.txt @@ -9,6 +9,7 @@ Required properties: - compatible : should be one of "aspeed,ast2400-ibt-bmc" "aspeed,ast2500-ibt-bmc" + "ibm,microwatt-ibt-bmc" - reg: physical address and size of the registers Optional properties: diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig index 8b2f0f675e5f..079302f4eef2 100644 --- a/drivers/char/ipmi/Kconfig +++ b/drivers/char/ipmi/Kconfig @@ -152,13 +152,15 @@ config IPMI_KCS_BMC_SERIO called kcs_bmc_serio. config BT_IPMI_BMC - depends on ARCH_ASPEED || COMPILE_TEST + depends on ARCH_ASPEED || PPC_MICROWATT || COMPILE_TEST depends on REGMAP && REGMAP_MMIO && MFD_SYSCON tristate "BT IPMI bmc driver" help Provides a driver for the BT (Block Transfer) IPMI interface - found on Aspeed SOCs (AST2400 and AST2500). The driver - implements the BMC side of the BT interface. + found on Aspeed SOCs (AST2400 and AST2500) as well as the OpenPOWER + LPC peripheral macro at + <https://github.com/OpenPOWERFoundation/lpcperipheral> + The driver implements the BMC side of the BT interface. config IPMB_DEVICE_INTERFACE tristate 'IPMB Interface handler' diff --git a/drivers/char/ipmi/bt-bmc.c b/drivers/char/ipmi/bt-bmc.c index b48e04405ac4..24327b57c60b 100644 --- a/drivers/char/ipmi/bt-bmc.c +++ b/drivers/char/ipmi/bt-bmc.c @@ -41,6 +41,11 @@ #define BT_CR2_IRQ_HBUSY 0x40 #define ASPEED_BT_CR3 0xc +#define MICROWATT_IRQ_MASK 0x0 +#define MICROWATT_IRQ_STATUS 0x4 +#define IRQ_HOST_TO_BMC_ATTN 0x1 +#define IRQ_HOST_NOT_BUSY 0x2 + #define BT_CTRL 0x10 #define BT_CTRL_B_BUSY 0x80 #define BT_CTRL_H_BUSY 0x40 @@ -395,6 +400,27 @@ static irqreturn_t aspeed_bt_bmc_irq(int irq, void *arg) return IRQ_HANDLED; } +static irqreturn_t microwatt_bt_bmc_irq(int irq, void *arg) +{ + struct bt_bmc *bt_bmc = arg; + u32 reg; + int rc; + + rc = regmap_read(bt_bmc->map, bt_bmc->offset + MICROWATT_IRQ_STATUS, ®); + if (rc) + return IRQ_NONE; + + /* Interrupt wasn't something we knew about */ + if (!(reg & (IRQ_HOST_TO_BMC_ATTN | IRQ_HOST_NOT_BUSY))) + return IRQ_NONE; + + /* ack all pending IRQs */ + regmap_write(bt_bmc->map, bt_bmc->offset + MICROWATT_IRQ_STATUS, 0); + + wake_up(&bt_bmc->queue); + return IRQ_HANDLED; +} + static int aspeed_bt_bmc_config_irq(struct bt_bmc *bt_bmc, struct platform_device *pdev) { @@ -446,6 +472,48 @@ static const struct bt_bmc_ops aspeed_bt_bmc_ops = { .enable_bt = aspeed_enable_bt, }; +static int microwatt_bt_bmc_config_irq(struct bt_bmc *bt_bmc, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int rc; + + bt_bmc->irq = platform_get_irq_optional(pdev, 0); + if (bt_bmc->irq < 0) + return bt_bmc->irq; + + rc = devm_request_irq(dev, bt_bmc->irq, microwatt_bt_bmc_irq, IRQF_SHARED, + DEVICE_NAME, bt_bmc); + if (rc < 0) { + dev_warn(dev, "Unable to request IRQ %d\n", bt_bmc->irq); + bt_bmc->irq = rc; + return rc; + } + + /* + * Configure the hardware to give us an interrupt whenever the H2B + * bit is set or the HBUSY bit is cleared. + * + * H2B will be asserted when the bmc has data for us; HBUSY + * will be cleared (along with B2H) when we can write the next + * message to the BT buffer + */ + rc = regmap_update_bits(bt_bmc->map, bt_bmc->offset + MICROWATT_IRQ_MASK, + (IRQ_HOST_TO_BMC_ATTN | IRQ_HOST_NOT_BUSY), + (IRQ_HOST_TO_BMC_ATTN | IRQ_HOST_NOT_BUSY)); + + return rc; +} + +static void microwatt_enable_bt(struct bt_bmc *bt_bmc) +{ +} + +static const struct bt_bmc_ops microwatt_bt_bmc_ops = { + .config_irq = microwatt_bt_bmc_config_irq, + .enable_bt = microwatt_enable_bt, +}; + static int bt_bmc_probe(struct platform_device *pdev) { struct bt_bmc *bt_bmc; @@ -530,6 +598,7 @@ static int bt_bmc_remove(struct platform_device *pdev) static const struct of_device_id bt_bmc_match[] = { { .compatible = "aspeed,ast2400-ibt-bmc", .data = &aspeed_bt_bmc_ops }, { .compatible = "aspeed,ast2500-ibt-bmc", .data = &aspeed_bt_bmc_ops }, + { .compatible = "ibm,microwatt-ibt-bmc", .data = µwatt_bt_bmc_ops }, { }, }; -- 2.31.1