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