forked from luck/tmp_suning_uos_patched
582563074a
In the current mailbox driver, the mailbox internal pointer for callback can be directly manipulated by the Users, so a second User can easily corrupt the first user's callback pointer. The initial effort to correct this issue can be referred here: https://patchwork.kernel.org/patch/107520/ Along with fixing the above stated issue, this patch adds the flexibility option to register notifications from multiple readers to the events received on a mailbox instance. The discussion regarding this can be referred here. http://www.mail-archive.com/linux-omap@vger.kernel.org/msg30671.html Signed-off-by: Hari Kanigeri <h-kanigeri2@ti.com> Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com> Acked-by: Hiroshi Doyu <hiroshi.doyu@nokia.com>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* mailbox.h */
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#ifndef MAILBOX_H
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#define MAILBOX_H
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/kfifo.h>
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typedef u32 mbox_msg_t;
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struct omap_mbox;
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typedef int __bitwise omap_mbox_irq_t;
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#define IRQ_TX ((__force omap_mbox_irq_t) 1)
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#define IRQ_RX ((__force omap_mbox_irq_t) 2)
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typedef int __bitwise omap_mbox_type_t;
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#define OMAP_MBOX_TYPE1 ((__force omap_mbox_type_t) 1)
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#define OMAP_MBOX_TYPE2 ((__force omap_mbox_type_t) 2)
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struct omap_mbox_ops {
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omap_mbox_type_t type;
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int (*startup)(struct omap_mbox *mbox);
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void (*shutdown)(struct omap_mbox *mbox);
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/* fifo */
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mbox_msg_t (*fifo_read)(struct omap_mbox *mbox);
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void (*fifo_write)(struct omap_mbox *mbox, mbox_msg_t msg);
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int (*fifo_empty)(struct omap_mbox *mbox);
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int (*fifo_full)(struct omap_mbox *mbox);
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/* irq */
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void (*enable_irq)(struct omap_mbox *mbox,
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omap_mbox_irq_t irq);
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void (*disable_irq)(struct omap_mbox *mbox,
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omap_mbox_irq_t irq);
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void (*ack_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
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int (*is_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
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/* ctx */
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void (*save_ctx)(struct omap_mbox *mbox);
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void (*restore_ctx)(struct omap_mbox *mbox);
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};
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struct omap_mbox_queue {
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spinlock_t lock;
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struct kfifo fifo;
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struct work_struct work;
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struct tasklet_struct tasklet;
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struct omap_mbox *mbox;
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bool full;
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};
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struct omap_mbox {
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char *name;
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unsigned int irq;
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struct omap_mbox_queue *txq, *rxq;
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struct omap_mbox_ops *ops;
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struct device *dev;
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void *priv;
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int use_count;
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struct blocking_notifier_head notifier;
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};
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int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
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void omap_mbox_init_seq(struct omap_mbox *);
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struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
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void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
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int omap_mbox_register(struct device *parent, struct omap_mbox **);
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int omap_mbox_unregister(void);
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static inline void omap_mbox_save_ctx(struct omap_mbox *mbox)
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{
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if (!mbox->ops->save_ctx) {
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dev_err(mbox->dev, "%s:\tno save\n", __func__);
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return;
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}
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mbox->ops->save_ctx(mbox);
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}
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static inline void omap_mbox_restore_ctx(struct omap_mbox *mbox)
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{
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if (!mbox->ops->restore_ctx) {
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dev_err(mbox->dev, "%s:\tno restore\n", __func__);
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return;
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}
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mbox->ops->restore_ctx(mbox);
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}
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static inline void omap_mbox_enable_irq(struct omap_mbox *mbox,
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omap_mbox_irq_t irq)
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{
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mbox->ops->enable_irq(mbox, irq);
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}
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static inline void omap_mbox_disable_irq(struct omap_mbox *mbox,
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omap_mbox_irq_t irq)
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{
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mbox->ops->disable_irq(mbox, irq);
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}
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#endif /* MAILBOX_H */
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