diff options
| -rw-r--r-- | drivers/net/caif/caif_shm_u5500.c | 129 |
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 00000000000..1cd90da86f1 --- /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); |