[PATCH v7 3/4] irqchip:create irq domain for each mbigen device
From: MaJun
Date: Wed Oct 21 2015 - 02:10:24 EST
From: Ma Jun <majun258@xxxxxxxxxx>
For peripheral devices which connect to mbigen,mbigen is a interrupt
controller. So, we create irq domain for each mbigen device and add
mbigen irq domain into irq hierarchy structure.
Signed-off-by: Ma Jun <majun258@xxxxxxxxxx>
---
drivers/irqchip/irq-mbigen.c | 160 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 160 insertions(+), 0 deletions(-)
diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index f18132f..a0bbc2d 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -16,27 +16,172 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
#include <linux/module.h>
+#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+/* Interrupt numbers per mbigen node supported */
+#define IRQS_PER_MBIGEN_NODE 128
+
+/* 16 irqs (Pin0-pin15) are reserved for each mbigen chip */
+#define RESERVED_IRQ_PER_MBIGEN_CHIP 16
+
+/**
+ * In mbigen vector register
+ * bit[21:12]: event id value
+ * bit[11:0]: device id
+ */
+#define IRQ_EVENT_ID_SHIFT 12
+#define IRQ_EVENT_ID_MASK 0x3ff
+
+/* register range of each mbigen node */
+#define MBIGEN_NODE_OFFSET 0x1000
+
+/* offset of vector register in mbigen node */
+#define REG_MBIGEN_VEC_OFFSET 0x200
+
/**
* struct mbigen_device - holds the information of mbigen device.
*
* @pdev: pointer to the platform device structure of mbigen chip.
* @base: mapped address of this mbigen chip.
+ * @domain: pointer to the irq domain
*/
struct mbigen_device {
struct platform_device *pdev;
void __iomem *base;
+ struct irq_domain *domain;
+};
+
+/**
+ * struct mbigen_irq_data - private data of each irq
+ *
+ * @base: mapped address of mbigen chip
+ * @reg_vec: addr offset of interrupt vector register.
+ */
+struct mbigen_irq_data {
+ void __iomem *base;
+ unsigned int reg_vec;
+};
+
+static inline int get_mbigen_vec_reg(u32 nid, u32 offset)
+{
+ return (offset * 4) + nid * MBIGEN_NODE_OFFSET
+ + REG_MBIGEN_VEC_OFFSET;
+}
+
+
+static struct irq_chip mbigen_irq_chip = {
+ .name = "mbigen-v2",
+};
+
+static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+ struct mbigen_irq_data *mgn_irq_data = irq_get_chip_data(desc->irq);
+ u32 val;
+
+ val = readl_relaxed(mgn_irq_data->reg_vec + mgn_irq_data->base);
+
+ val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT);
+ val |= (msg->data << IRQ_EVENT_ID_SHIFT);
+
+ writel_relaxed(val, mgn_irq_data->reg_vec + mgn_irq_data->base);
+}
+
+static struct mbigen_irq_data *set_mbigen_irq_data(int hwirq)
+{
+ struct mbigen_irq_data *datap;
+ unsigned int nid, pin_offset;
+
+ datap = kzalloc(sizeof(*datap), GFP_KERNEL);
+ if (!datap)
+ return NULL;
+
+ /* get the mbigen node number */
+ nid = (hwirq - RESERVED_IRQ_PER_MBIGEN_CHIP) / IRQS_PER_MBIGEN_NODE + 1;
+
+ pin_offset = (hwirq - RESERVED_IRQ_PER_MBIGEN_CHIP)
+ % IRQS_PER_MBIGEN_NODE;
+
+ datap->reg_vec = get_mbigen_vec_reg(nid, pin_offset);
+
+ return datap;
+}
+
+static int mbigen_domain_translate(struct irq_domain *d,
+ struct irq_fwspec *fwspec,
+ unsigned long *hwirq,
+ unsigned int *type)
+{
+ if (is_of_node(fwspec->fwnode)) {
+ if (fwspec->param_count != 2)
+ return -EINVAL;
+
+ *hwirq = fwspec->param[0];
+ *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int mbigen_irq_domain_alloc(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs,
+ void *args)
+{
+ struct irq_fwspec *fwspec = args;
+ irq_hw_number_t hwirq = fwspec->param[0];
+ struct mbigen_device *mgn_chip;
+ struct mbigen_irq_data *mgn_irq_data;
+ int i, err;
+
+ err = platform_msi_domain_alloc(domain, virq, nr_irqs);
+ if (err)
+ return err;
+
+ /* set related information of this irq */
+ mgn_irq_data = set_mbigen_irq_data(hwirq);
+ if (!mgn_irq_data)
+ return err;
+
+ mgn_chip = platform_msi_get_host_data(domain);
+ mgn_irq_data->base = mgn_chip->base;
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+ &mbigen_irq_chip, mgn_irq_data);
+
+ return 0;
+}
+
+static void mbigen_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+ struct mbigen_irq_data *mgn_irq_data = irq_data_get_irq_chip_data(d);
+
+ kfree(mgn_irq_data);
+ irq_domain_free_irqs_common(domain, virq, nr_irqs);
+}
+
+static struct irq_domain_ops mbigen_domain_ops = {
+ .translate = mbigen_domain_translate,
+ .alloc = mbigen_irq_domain_alloc,
+ .free = mbigen_domain_free,
};
static int mbigen_device_probe(struct platform_device *pdev)
{
struct mbigen_device *mgn_chip;
+ struct irq_domain *domain;
+ u32 num_msis;
mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
if (!mgn_chip)
@@ -45,6 +190,20 @@ static int mbigen_device_probe(struct platform_device *pdev)
mgn_chip->pdev = pdev;
mgn_chip->base = of_iomap(pdev->dev.of_node, 0);
+ /* If there is no "num-msi" property, assume 64... */
+ if (of_property_read_u32(pdev->dev.of_node, "num-msis", &num_msis) < 0)
+ num_msis = 64;
+
+ domain = platform_msi_create_device_domain(&pdev->dev, num_msis,
+ mbigen_write_msg,
+ &mbigen_domain_ops,
+ mgn_chip);
+
+ if (!domain)
+ return -ENOMEM;
+
+ mgn_chip->domain = domain;
+
platform_set_drvdata(pdev, mgn_chip);
return 0;
@@ -54,6 +213,7 @@ static int mbigen_device_remove(struct platform_device *pdev)
{
struct mbigen_device *mgn_chip = platform_get_drvdata(pdev);
+ irq_domain_remove(mgn_chip->domain);
iounmap(mgn_chip->base);
return 0;
--
1.7.1
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