| /* |
| * Marvell 88E6xxx Address Translation Unit (ATU) support |
| * |
| * Copyright (c) 2008 Marvell Semiconductor |
| * Copyright (c) 2017 Savoir-faire Linux, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include "mv88e6xxx.h" |
| #include "global1.h" |
| |
| /* Offset 0x0A: ATU Control Register */ |
| |
| int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip, |
| unsigned int msecs) |
| { |
| const unsigned int coeff = chip->info->age_time_coeff; |
| const unsigned int min = 0x01 * coeff; |
| const unsigned int max = 0xff * coeff; |
| u8 age_time; |
| u16 val; |
| int err; |
| |
| if (msecs < min || msecs > max) |
| return -ERANGE; |
| |
| /* Round to nearest multiple of coeff */ |
| age_time = (msecs + coeff / 2) / coeff; |
| |
| err = mv88e6xxx_g1_read(chip, GLOBAL_ATU_CONTROL, &val); |
| if (err) |
| return err; |
| |
| /* AgeTime is 11:4 bits */ |
| val &= ~0xff0; |
| val |= age_time << 4; |
| |
| return mv88e6xxx_g1_write(chip, GLOBAL_ATU_CONTROL, val); |
| } |