[PATCH linux dev-4.17 3/7] irqchip: Aspeed: Add Aspeed sdhci irq driver
Ryan Chen
ryanchen.aspeed at gmail.com
Wed Jul 11 15:17:06 AEST 2018
In Aspeed SoC's sdhci have two slots and have a interrupt status and
general information in top for register. so it need a sdhci irq driver
probe defore sdhci driver probe
Signed-off-by: Ryan Chen <ryanchen.aspeed at gmail.com>
---
drivers/irqchip/Makefile | 2 +-
drivers/irqchip/irq-aspeed-sdhci-ic.c | 147 ++++++++++++++++++++++++++++++++++
include/linux/mmc/sdhci-aspeed-data.h | 28 +++++++
3 files changed, 176 insertions(+), 1 deletion(-)
create mode 100644 drivers/irqchip/irq-aspeed-sdhci-ic.c
create mode 100644 include/linux/mmc/sdhci-aspeed-data.h
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 5ed465a..579c4fb 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -78,7 +78,7 @@ obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o
obj-$(CONFIG_MVEBU_PIC) += irq-mvebu-pic.o
obj-$(CONFIG_LS_SCFG_MSI) += irq-ls-scfg-msi.o
obj-$(CONFIG_EZNPS_GIC) += irq-eznps.o
-obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o irq-aspeed-i2c-ic.o
+obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o irq-aspeed-i2c-ic.o irq-aspeed-sdhci-ic.o
obj-$(CONFIG_STM32_EXTI) += irq-stm32-exti.o
obj-$(CONFIG_QCOM_IRQ_COMBINER) += qcom-irq-combiner.o
obj-$(CONFIG_IRQ_UNIPHIER_AIDET) += irq-uniphier-aidet.o
diff --git a/drivers/irqchip/irq-aspeed-sdhci-ic.c b/drivers/irqchip/irq-aspeed-sdhci-ic.c
new file mode 100644
index 0000000..c3d9d45
--- /dev/null
+++ b/drivers/irqchip/irq-aspeed-sdhci-ic.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SDHCI IRQCHIP driver for the Aspeed SoC
+ *
+ * Copyright (C) ASPEED Technology Inc.
+ * Ryan Chen <ryan_chen at aspeedtech.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/mmc/sdhci-aspeed-data.h>
+
+#define ASPEED_SDHCI_SLOT_NUM 2
+
+static void aspeed_sdhci_irq_handler(struct irq_desc *desc)
+{
+ struct aspeed_sdhci_irq *sdhci_irq = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned long bit, status;
+ unsigned int slot_irq;
+
+ chained_irq_enter(chip, desc);
+ status = readl(sdhci_irq->regs + ASPEED_SDHCI_ISR);
+ for_each_set_bit(bit, &status, ASPEED_SDHCI_SLOT_NUM) {
+ slot_irq = irq_find_mapping(sdhci_irq->irq_domain, bit);
+ generic_handle_irq(slot_irq);
+ }
+ chained_irq_exit(chip, desc);
+}
+
+static void noop(struct irq_data *data) { }
+
+static unsigned int noop_ret(struct irq_data *data)
+{
+ return 0;
+}
+
+struct irq_chip sdhci_irq_chip = {
+ .name = "sdhci-ic",
+ .irq_startup = noop_ret,
+ .irq_shutdown = noop,
+ .irq_enable = noop,
+ .irq_disable = noop,
+ .irq_ack = noop,
+ .irq_mask = noop,
+ .irq_unmask = noop,
+ .flags = IRQCHIP_SKIP_SET_WAKE,
+};
+
+static int ast_sdhci_map_irq_domain(struct irq_domain *domain,
+ unsigned int irq, irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &sdhci_irq_chip, handle_simple_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops aspeed_sdhci_irq_domain_ops = {
+ .map = ast_sdhci_map_irq_domain,
+};
+
+static int irq_aspeed_sdhci_probe(struct platform_device *pdev)
+{
+ struct aspeed_sdhci_irq *sdhci_irq;
+ struct clk *sdclk;
+
+ sdhci_irq = kzalloc(sizeof(*sdhci_irq), GFP_KERNEL);
+ if (!sdhci_irq)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, sdhci_irq);
+ //node->data = sdhci_irq;
+ pdev->dev.of_node->data = sdhci_irq;
+
+ sdhci_irq->regs = of_iomap(pdev->dev.of_node, 0);
+ if (IS_ERR(sdhci_irq->regs))
+ return PTR_ERR(sdhci_irq->regs);
+
+ sdclk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(sdclk)) {
+ dev_err(&pdev->dev, "no sdclk clock defined\n");
+ return PTR_ERR(sdclk);
+ }
+
+ clk_prepare_enable(sdclk);
+
+ sdhci_irq->parent_irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (sdhci_irq->parent_irq < 0)
+ return sdhci_irq->parent_irq;
+
+ sdhci_irq->irq_domain = irq_domain_add_linear(
+ pdev->dev.of_node, ASPEED_SDHCI_SLOT_NUM,
+ &aspeed_sdhci_irq_domain_ops, NULL);
+ if (!sdhci_irq->irq_domain)
+ return -ENOMEM;
+
+ sdhci_irq->irq_domain->name = "aspeed-sdhci-irq";
+
+ irq_set_chained_handler_and_data(sdhci_irq->parent_irq,
+ aspeed_sdhci_irq_handler, sdhci_irq);
+
+ pr_info("sdhci irq controller registered, irq %d\n", sdhci_irq->parent_irq);
+
+ return 0;
+}
+
+static const struct of_device_id irq_aspeed_sdhci_dt_ids[] = {
+ { .compatible = "aspeed,aspeed-sdhci-irq", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, irq_aspeed_sdhci_dt_ids);
+
+static struct platform_driver irq_aspeed_sdhci_device_driver = {
+ .probe = irq_aspeed_sdhci_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = irq_aspeed_sdhci_dt_ids,
+ }
+};
+
+static int __init irq_aspeed_sdhci_init(void)
+{
+ return platform_driver_register(&irq_aspeed_sdhci_device_driver);
+}
+core_initcall(irq_aspeed_sdhci_init);
+
+MODULE_AUTHOR("Ryan Chen");
+MODULE_DESCRIPTION("ASPEED SOC SDHCI IRQ Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mmc/sdhci-aspeed-data.h b/include/linux/mmc/sdhci-aspeed-data.h
new file mode 100644
index 0000000..fba2bf2
--- /dev/null
+++ b/include/linux/mmc/sdhci-aspeed-data.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_MMC_SDHCI_ASPEED_DATA_H
+#define LINUX_MMC_SDHCI_ASPEED_DATA_H
+
+#include <linux/io.h>
+
+#define ASPEED_SDHCI_INFO 0x00
+#define ASPEED_SDHCI_S1MMC8 BIT(25)
+#define ASPEED_SDHCI_S0MMC8 BIT(24)
+#define ASPEED_SDHCI_BLOCK 0x04
+#define ASPEED_SDHCI_CTRL 0xF0
+#define ASPEED_SDHCI_ISR 0xFC
+
+struct aspeed_sdhci_irq {
+ void __iomem *regs;
+ int parent_irq;
+ struct irq_domain *irq_domain;
+};
+
+static inline void aspeed_sdhci_set_8bit_mode(struct aspeed_sdhci_irq *sdhci_irq, int mode)
+{
+ if (mode)
+ writel(ASPEED_SDHCI_S0MMC8 | readl(sdhci_irq->regs), sdhci_irq->regs);
+ else
+ writel(~ASPEED_SDHCI_S0MMC8 & readl(sdhci_irq->regs), sdhci_irq->regs);
+}
+
+#endif
--
2.7.4
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