/**
* dprc_get_obj_region() - Get region information for a specified object.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPRC object
* @obj_type; Object type as returned in dprc_get_obj()
* @obj_id: Unique object instance as returned in dprc_get_obj()
* @region_index: The specific region to query
* @region_desc: Returns the requested region descriptor
*
* Return: '0' on Success; Error code otherwise.
*/
int dprc_get_obj_region(struct fsl_mc_io *mc_io,
u32 cmd_flags,
u16 token,
char *obj_type,
int obj_id,
u8 region_index,
struct dprc_region_desc *region_desc)
{
struct fsl_mc_command cmd = { 0 };
struct dprc_cmd_get_obj_region *cmd_params;
struct dprc_rsp_get_obj_region *rsp_params;
u16 major_ver, minor_ver;
int err;
/* prepare command */
err = dprc_get_api_version(mc_io, 0,
&major_ver,
&minor_ver);
if (err)
return err;
/**
* MC API version 6.3 introduced a new field to the region
* descriptor: base_address. If the older API is in use then the base
* address is set to zero to indicate it needs to be obtained elsewhere
* (typically the device tree).
*/
if (major_ver > 6 || (major_ver == 6 && minor_ver >= 3))
cmd.header =
mc_encode_cmd_header(DPRC_CMDID_GET_OBJ_REG_V2,
cmd_flags, token);
else
cmd.header =
mc_encode_cmd_header(DPRC_CMDID_GET_OBJ_REG,
cmd_flags, token);
cmd_params = (struct dprc_cmd_get_obj_region *)cmd.params;
cmd_params->obj_id = cpu_to_le32(obj_id);
cmd_params->region_index = region_index;
strncpy(cmd_params->obj_type, obj_type, 16);
cmd_params->obj_type[15] = '\0';
/* send command to mc*/
err = mc_send_command(mc_io, &cmd);
if (err)
return err;
/* retrieve response parameters */
rsp_params = (struct dprc_rsp_get_obj_region *)cmd.params;
region_desc->base_offset = le64_to_cpu(rsp_params->base_offset);
region_desc->size = le32_to_cpu(rsp_params->size);
if (major_ver > 6 || (major_ver == 6 && minor_ver >= 3))
region_desc->base_address = le64_to_cpu(rsp_params->base_addr);
else
region_desc->base_address = 0;
return 0;
}
static int dprc_version_check(struct fsl_mc_io *mc_io, uint16_t handle)
{
int error;
uint16_t major_ver, minor_ver;
error = dprc_get_api_version(mc_io, 0,
&major_ver,
&minor_ver);
if (error < 0) {
printf("dprc_get_api_version() failed: %d\n", error);
return error;
}
if (major_ver < DPRC_VER_MAJOR || (major_ver == DPRC_VER_MAJOR &&
minor_ver < DPRC_VER_MINOR)) {
printf("DPRC version mismatch found %u.%u,",
major_ver, minor_ver);
printf("supported version is %u.%u\n",
DPRC_VER_MAJOR, DPRC_VER_MINOR);
}
return error;
}
/**
* dprc_probe - callback invoked when a DPRC is being bound to this driver
*
* @mc_dev: Pointer to fsl-mc device representing a DPRC
*
* It opens the physical DPRC in the MC.
* It scans the DPRC to discover the MC objects contained in it.
* It creates the interrupt pool for the MC bus associated with the DPRC.
* It configures the interrupts for the DPRC device itself.
*/
static int dprc_probe(struct fsl_mc_device *mc_dev)
{
int error;
size_t region_size;
struct device *parent_dev = mc_dev->dev.parent;
struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
bool mc_io_created = false;
bool msi_domain_set = false;
u16 major_ver, minor_ver;
if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
return -EINVAL;
if (WARN_ON(dev_get_msi_domain(&mc_dev->dev)))
return -EINVAL;
if (!mc_dev->mc_io) {
/*
* This is a child DPRC:
*/
if (WARN_ON(!dev_is_fsl_mc(parent_dev)))
return -EINVAL;
if (WARN_ON(mc_dev->obj_desc.region_count == 0))
return -EINVAL;
region_size = mc_dev->regions[0].end -
mc_dev->regions[0].start + 1;
error = fsl_create_mc_io(&mc_dev->dev,
mc_dev->regions[0].start,
region_size,
NULL,
FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
&mc_dev->mc_io);
if (error < 0)
return error;
mc_io_created = true;
/*
* Inherit parent MSI domain:
*/
dev_set_msi_domain(&mc_dev->dev,
dev_get_msi_domain(parent_dev));
msi_domain_set = true;
} else {
/*
* This is a root DPRC
*/
struct irq_domain *mc_msi_domain;
if (WARN_ON(dev_is_fsl_mc(parent_dev)))
return -EINVAL;
error = fsl_mc_find_msi_domain(parent_dev,
&mc_msi_domain);
if (error < 0) {
dev_warn(&mc_dev->dev,
"WARNING: MC bus without interrupt support\n");
} else {
dev_set_msi_domain(&mc_dev->dev, mc_msi_domain);
msi_domain_set = true;
}
}
error = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id,
&mc_dev->mc_handle);
if (error < 0) {
dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error);
goto error_cleanup_msi_domain;
}
error = dprc_get_attributes(mc_dev->mc_io, 0, mc_dev->mc_handle,
&mc_bus->dprc_attr);
if (error < 0) {
dev_err(&mc_dev->dev, "dprc_get_attributes() failed: %d\n",
error);
goto error_cleanup_open;
}
error = dprc_get_api_version(mc_dev->mc_io, 0,
&major_ver,
&minor_ver);
if (error < 0) {
dev_err(&mc_dev->dev, "dprc_get_api_version() failed: %d\n",
error);
goto error_cleanup_open;
}
if (major_ver < DPRC_MIN_VER_MAJOR ||
(major_ver == DPRC_MIN_VER_MAJOR &&
minor_ver < DPRC_MIN_VER_MINOR)) {
dev_err(&mc_dev->dev,
"ERROR: DPRC version %d.%d not supported\n",
major_ver, minor_ver);
error = -ENOTSUPP;
goto error_cleanup_open;
}
mutex_init(&mc_bus->scan_mutex);
/*
* Discover MC objects in DPRC object:
*/
error = dprc_scan_container(mc_dev);
if (error < 0)
goto error_cleanup_open;
/*
* Configure interrupt for the DPRC object associated with this MC bus:
*/
error = dprc_setup_irq(mc_dev);
if (error < 0)
goto error_cleanup_open;
dev_info(&mc_dev->dev, "DPRC device bound to driver");
return 0;
error_cleanup_open:
(void)dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
error_cleanup_msi_domain:
if (msi_domain_set)
dev_set_msi_domain(&mc_dev->dev, NULL);
if (mc_io_created) {
fsl_destroy_mc_io(mc_dev->mc_io);
mc_dev->mc_io = NULL;
}
return error;
}
