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Commit f3c221f6 authored by Eliad Peller's avatar Eliad Peller Committed by Emmanuel Grumbach
Browse files

iwlwifi: mvm: add debugfs for prph reg read/write 



Allow reading/writing prph registers.

The address is set in the first argument
of the write operation. second argument
is optional and can be used for writing.

e.g.
echo '0xA01234 0x99' > /sys/kernel/debug/ieee80211/phy0/iwlwifi/iwlmvm/prph_reg
will write 0x99 into reg 0xA01234

cat /sys/kernel/debug/ieee80211/phy0/iwlwifi/iwlmvm/prph_reg
will show its current value (probably 0x99)

Signed-off-by: default avatarEliad Peller <eliadx.peller@intel.com>
Reviewed-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
parent 63f7535d

drivers/net/wireless/iwlwifi/mvm/debugfs.c

+44 −0
Original line number Diff line number Diff line
@@ -907,6 +907,49 @@ static ssize_t iwl_dbgfs_d0i3_refs_write(struct iwl_mvm *mvm, char *buf, 
#define MVM_DEBUGFS_ADD_FILE(name, parent, mode) \

	MVM_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode)



static ssize_t

iwl_dbgfs_prph_reg_read(struct file *file,

			char __user *user_buf,

			size_t count, loff_t *ppos)

{

	struct iwl_mvm *mvm = file->private_data;

	int pos = 0;

	char buf[32];

	const size_t bufsz = sizeof(buf);



	if (!mvm->dbgfs_prph_reg_addr)

		return -EINVAL;



	pos += scnprintf(buf + pos, bufsz - pos, "Reg 0x%x: (0x%x)\n",

		mvm->dbgfs_prph_reg_addr,

		iwl_read_prph(mvm->trans, mvm->dbgfs_prph_reg_addr));



	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);

}



static ssize_t

iwl_dbgfs_prph_reg_write(struct iwl_mvm *mvm, char *buf,

			 size_t count, loff_t *ppos)

{

	u8 args;

	u32 value;



	args = sscanf(buf, "%i %i", &mvm->dbgfs_prph_reg_addr, &value);

	/* if we only want to set the reg address - nothing more to do */

	if (args == 1)

		goto out;



	/* otherwise, make sure we have both address and value */

	if (args != 2)

		return -EINVAL;



	iwl_write_prph(mvm->trans, mvm->dbgfs_prph_reg_addr, value);

out:

	return count;

}



MVM_DEBUGFS_READ_WRITE_FILE_OPS(prph_reg, 64);



/* Device wide debugfs entries */

MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush, 16);

MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain, 8);
@@ -951,6 +994,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir) 
	MVM_DEBUGFS_ADD_FILE(fw_nmi, mvm->debugfs_dir, S_IWUSR);

	MVM_DEBUGFS_ADD_FILE(scan_ant_rxchain, mvm->debugfs_dir,

			     S_IWUSR | S_IRUSR);

	MVM_DEBUGFS_ADD_FILE(prph_reg, mvm->debugfs_dir, S_IWUSR | S_IRUSR);

	MVM_DEBUGFS_ADD_FILE(d0i3_refs, mvm->debugfs_dir, S_IRUSR | S_IWUSR);



#ifdef CONFIG_IWLWIFI_BCAST_FILTERING

drivers/net/wireless/iwlwifi/mvm/mvm.h

+1 −0
Original line number Diff line number Diff line
@@ -518,6 +518,7 @@ struct iwl_mvm { 
#ifdef CONFIG_IWLWIFI_DEBUGFS

	struct dentry *debugfs_dir;

	u32 dbgfs_sram_offset, dbgfs_sram_len;

	u32 dbgfs_prph_reg_addr;

	bool disable_power_off;

	bool disable_power_off_d3;