irqchip: st: Supply new driver for STi based devices
authorLee Jones <lee.jones@linaro.org>
Wed, 18 Feb 2015 15:13:58 +0000 (15:13 +0000)
committerJason Cooper <jason@lakedaemon.net>
Tue, 3 Mar 2015 19:48:53 +0000 (19:48 +0000)
This driver is used to enable System Configuration Register controlled
External, CTI (Core Sight), PMU (Performance Management), and PL310 L2
Cache IRQs prior to use.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lkml.kernel.org/r/1424272444-16230-3-git-send-email-lee.jones@linaro.org
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
drivers/irqchip/Kconfig
drivers/irqchip/Makefile
drivers/irqchip/irq-st.c [new file with mode: 0644]

index cc79d2a5a8c212999ccc71da19f019ea5bf30210..c8d260e33a90d340cdb0a98d23eb1d289ba86160 100644 (file)
@@ -110,6 +110,13 @@ config RENESAS_IRQC
        bool
        select IRQ_DOMAIN
 
+config ST_IRQCHIP
+       bool
+       select REGMAP
+       select MFD_SYSCON
+       help
+         Enables SysCfg Controlled IRQs on STi based platforms.
+
 config TB10X_IRQC
        bool
        select IRQ_DOMAIN
index 42965d2476bbb03cb7d7caf66980b6caa360a16c..9bb4fd191e946e38af05af71ce010680cd3fb419 100644 (file)
@@ -33,6 +33,7 @@ obj-$(CONFIG_RENESAS_IRQC)            += irq-renesas-irqc.o
 obj-$(CONFIG_VERSATILE_FPGA_IRQ)       += irq-versatile-fpga.o
 obj-$(CONFIG_ARCH_NSPIRE)              += irq-zevio.o
 obj-$(CONFIG_ARCH_VT8500)              += irq-vt8500.o
+obj-$(CONFIG_ST_IRQCHIP)               += irq-st.o
 obj-$(CONFIG_TB10X_IRQC)               += irq-tb10x.o
 obj-$(CONFIG_XTENSA)                   += irq-xtensa-pic.o
 obj-$(CONFIG_XTENSA_MX)                        += irq-xtensa-mx.o
diff --git a/drivers/irqchip/irq-st.c b/drivers/irqchip/irq-st.c
new file mode 100644 (file)
index 0000000..9af48a8
--- /dev/null
@@ -0,0 +1,206 @@
+/*
+ *  Copyright (C) 2014 STMicroelectronics – All Rights Reserved
+ *
+ *  Author: Lee Jones <lee.jones@linaro.org>
+ *
+ *  This is a re-write of Christophe Kerello's PMU driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <dt-bindings/interrupt-controller/irq-st.h>
+#include <linux/err.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define STIH415_SYSCFG_642             0x0a8
+#define STIH416_SYSCFG_7543            0x87c
+#define STIH407_SYSCFG_5102            0x198
+#define STID127_SYSCFG_734             0x088
+
+#define ST_A9_IRQ_MASK                 0x001FFFFF
+#define ST_A9_IRQ_MAX_CHANS            2
+
+#define ST_A9_IRQ_EN_CTI_0             BIT(0)
+#define ST_A9_IRQ_EN_CTI_1             BIT(1)
+#define ST_A9_IRQ_EN_PMU_0             BIT(2)
+#define ST_A9_IRQ_EN_PMU_1             BIT(3)
+#define ST_A9_IRQ_EN_PL310_L2          BIT(4)
+#define ST_A9_IRQ_EN_EXT_0             BIT(5)
+#define ST_A9_IRQ_EN_EXT_1             BIT(6)
+#define ST_A9_IRQ_EN_EXT_2             BIT(7)
+
+#define ST_A9_FIQ_N_SEL(dev, chan)     (dev << (8  + (chan * 3)))
+#define ST_A9_IRQ_N_SEL(dev, chan)     (dev << (14 + (chan * 3)))
+#define ST_A9_EXTIRQ_INV_SEL(dev)      (dev << 20)
+
+struct st_irq_syscfg {
+       struct regmap *regmap;
+       unsigned int syscfg;
+       unsigned int config;
+       bool ext_inverted;
+};
+
+static const struct of_device_id st_irq_syscfg_match[] = {
+       {
+               .compatible = "st,stih415-irq-syscfg",
+               .data = (void *)STIH415_SYSCFG_642,
+       },
+       {
+               .compatible = "st,stih416-irq-syscfg",
+               .data = (void *)STIH416_SYSCFG_7543,
+       },
+       {
+               .compatible = "st,stih407-irq-syscfg",
+               .data = (void *)STIH407_SYSCFG_5102,
+       },
+       {
+               .compatible = "st,stid127-irq-syscfg",
+               .data = (void *)STID127_SYSCFG_734,
+       },
+       {}
+};
+
+static int st_irq_xlate(struct platform_device *pdev,
+                       int device, int channel, bool irq)
+{
+       struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
+
+       /* Set the device enable bit. */
+       switch (device) {
+       case ST_IRQ_SYSCFG_EXT_0:
+               ddata->config |= ST_A9_IRQ_EN_EXT_0;
+               break;
+       case ST_IRQ_SYSCFG_EXT_1:
+               ddata->config |= ST_A9_IRQ_EN_EXT_1;
+               break;
+       case ST_IRQ_SYSCFG_EXT_2:
+               ddata->config |= ST_A9_IRQ_EN_EXT_2;
+               break;
+       case ST_IRQ_SYSCFG_CTI_0:
+               ddata->config |= ST_A9_IRQ_EN_CTI_0;
+               break;
+       case ST_IRQ_SYSCFG_CTI_1:
+               ddata->config |= ST_A9_IRQ_EN_CTI_1;
+               break;
+       case ST_IRQ_SYSCFG_PMU_0:
+               ddata->config |= ST_A9_IRQ_EN_PMU_0;
+               break;
+       case ST_IRQ_SYSCFG_PMU_1:
+               ddata->config |= ST_A9_IRQ_EN_PMU_1;
+               break;
+       case ST_IRQ_SYSCFG_pl310_L2:
+               ddata->config |= ST_A9_IRQ_EN_PL310_L2;
+               break;
+       case ST_IRQ_SYSCFG_DISABLED:
+               return 0;
+       default:
+               dev_err(&pdev->dev, "Unrecognised device %d\n", device);
+               return -EINVAL;
+       }
+
+       /* Select IRQ/FIQ channel for device. */
+       ddata->config |= irq ?
+               ST_A9_IRQ_N_SEL(device, channel) :
+               ST_A9_FIQ_N_SEL(device, channel);
+
+       return 0;
+}
+
+static int st_irq_syscfg_enable(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+       struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
+       int channels, ret, i;
+       u32 device, invert;
+
+       channels = of_property_count_u32_elems(np, "st,irq-device");
+       if (channels != ST_A9_IRQ_MAX_CHANS) {
+               dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
+               return -EINVAL;
+       }
+
+       channels = of_property_count_u32_elems(np, "st,fiq-device");
+       if (channels != ST_A9_IRQ_MAX_CHANS) {
+               dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
+               return -EINVAL;
+       }
+
+       for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
+               of_property_read_u32_index(np, "st,irq-device", i, &device);
+
+               ret = st_irq_xlate(pdev, device, i, true);
+               if (ret)
+                       return ret;
+
+               of_property_read_u32_index(np, "st,fiq-device", i, &device);
+
+               ret = st_irq_xlate(pdev, device, i, false);
+               if (ret)
+                       return ret;
+       }
+
+       /* External IRQs may be inverted. */
+       of_property_read_u32(np, "st,invert-ext", &invert);
+       ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
+
+       return regmap_update_bits(ddata->regmap, ddata->syscfg,
+                                 ST_A9_IRQ_MASK, ddata->config);
+}
+
+static int st_irq_syscfg_probe(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+       const struct of_device_id *match;
+       struct st_irq_syscfg *ddata;
+
+       ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+       if (!ddata)
+               return -ENOMEM;
+
+       match = of_match_device(st_irq_syscfg_match, &pdev->dev);
+       if (!match)
+               return -ENODEV;
+
+       ddata->syscfg = (unsigned int)match->data;
+
+       ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
+       if (IS_ERR(ddata->regmap)) {
+               dev_err(&pdev->dev, "syscfg phandle missing\n");
+               return PTR_ERR(ddata->regmap);
+       }
+
+       dev_set_drvdata(&pdev->dev, ddata);
+
+       return st_irq_syscfg_enable(pdev);
+}
+
+static int st_irq_syscfg_resume(struct device *dev)
+{
+       struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
+
+       return regmap_update_bits(ddata->regmap, ddata->syscfg,
+                                 ST_A9_IRQ_MASK, ddata->config);
+}
+
+static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
+
+static struct platform_driver st_irq_syscfg_driver = {
+       .driver = {
+               .name = "st_irq_syscfg",
+               .pm = &st_irq_syscfg_pm_ops,
+               .of_match_table = st_irq_syscfg_match,
+       },
+       .probe = st_irq_syscfg_probe,
+};
+
+static int __init st_irq_syscfg_init(void)
+{
+       return platform_driver_register(&st_irq_syscfg_driver);
+}
+core_initcall(st_irq_syscfg_init);