| /* |
| * 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); |