caif-u5500: CAIF shared memory mailbox interface

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 129 insertions, 0 deletions

diff --git a/drivers/net/caif/caif_shm_u5500.c b/drivers/net/caif/caif_shm_u5500.c
new file mode 100644
index 000000000000..1cd90da86f13
--- /dev/null
+++ b/drivers/net/caif/caif_shm_u5500.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
+ * Author:  Amarnath Revanna / amarnath.bangalore.revanna@stericsson.com
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":" __func__ "():" fmt
+
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <mach/mbox.h>
+#include <net/caif/caif_shm.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CAIF Shared Memory protocol driver");
+
+#define MAX_SHM_INSTANCES       1
+
+enum {
+        MBX_ACC0,
+        MBX_ACC1,
+        MBX_DSP
+};
+
+static struct shmdev_layer shmdev_lyr[MAX_SHM_INSTANCES];
+
+static unsigned int shm_start;
+static unsigned int shm_size;
+
+module_param(shm_size, uint  , 0440);
+MODULE_PARM_DESC(shm_total_size, "Start of SHM shared memory");
+
+module_param(shm_start, uint  , 0440);
+MODULE_PARM_DESC(shm_total_start, "Total Size of SHM shared memory");
+
+static int shmdev_send_msg(u32 dev_id, u32 mbx_msg)
+{
+        /* Always block until msg is written successfully */
+        mbox_send(shmdev_lyr[dev_id].hmbx, mbx_msg, true);
+        return 0;
+}
+
+static int shmdev_mbx_setup(void *pshmdrv_cb, struct shmdev_layer *pshm_dev,
+                                                         void *pshm_drv)
+{
+        /*
+         * For UX5500, we have only 1 SHM instance which uses MBX0
+         * for communication with the peer modem
+         */
+        pshm_dev->hmbx = mbox_setup(MBX_ACC0, pshmdrv_cb, pshm_drv);
+
+        if (!pshm_dev->hmbx)
+                return -ENODEV;
+        else
+                return 0;
+}
+
+static int __init caif_shmdev_init(void)
+{
+        int i, result;
+
+        /* Loop is currently overkill, there is only one instance */
+        for (i = 0; i < MAX_SHM_INSTANCES; i++) {
+
+                shmdev_lyr[i].shm_base_addr = shm_start;
+                shmdev_lyr[i].shm_total_sz = shm_size;
+
+                if (((char *)shmdev_lyr[i].shm_base_addr == NULL)
+                               || (shmdev_lyr[i].shm_total_sz <= 0))    {
+                        pr_warn("ERROR,"
+                                "Shared memory Address and/or Size incorrect"
+                                ", Bailing out ...\n");
+                        result = -EINVAL;
+                        goto clean;
+                }
+
+                pr_info("SHM AREA (instance %d) STARTS"
+                        " AT %p\n", i, (char *)shmdev_lyr[i].shm_base_addr);
+
+                shmdev_lyr[i].shm_id = i;
+                shmdev_lyr[i].pshmdev_mbxsend = shmdev_send_msg;
+                shmdev_lyr[i].pshmdev_mbxsetup = shmdev_mbx_setup;
+
+                /*
+                 * Finally, CAIF core module is called with details in place:
+                 * 1. SHM base address
+                 * 2. SHM size
+                 * 3. MBX handle
+                 */
+                result = caif_shmcore_probe(&shmdev_lyr[i]);
+                if (result) {
+                        pr_warn("ERROR[%d],"
+                                "Could not probe SHM core (instance %d)"
+                                " Bailing out ...\n", result, i);
+                        goto clean;
+                }
+        }
+
+        return 0;
+
+clean:
+        /*
+         * For now, we assume that even if one instance of SHM fails, we bail
+         * out of the driver support completely. For this, we need to release
+         * any memory allocated and unregister any instance of SHM net device.
+         */
+        for (i = 0; i < MAX_SHM_INSTANCES; i++) {
+                if (shmdev_lyr[i].pshm_netdev)
+                        unregister_netdev(shmdev_lyr[i].pshm_netdev);
+        }
+        return result;
+}
+
+static void __exit caif_shmdev_exit(void)
+{
+        int i;
+
+        for (i = 0; i < MAX_SHM_INSTANCES; i++) {
+                caif_shmcore_remove(shmdev_lyr[i].pshm_netdev);
+                kfree((void *)shmdev_lyr[i].shm_base_addr);
+        }
+
+}
+
+module_init(caif_shmdev_init);
+module_exit(caif_shmdev_exit);