linux-imx
Public
Source
committed 2874c5fd284x
pr_warn("You're using the deprecated elanfreq command line option. Use elanfreq.max_freq instead, please!\n");// SPDX-License-Identifier: GPL-2.0-or-later/* * elanfreq: cpufreq driver for the AMD ELAN family * * (c) Copyright 2002 Robert Schwebel <r.schwebel@pengutronix.de> * * Parts of this code are (c) Sven Geggus <sven@geggus.net> * * All Rights Reserved. * * 2002-02-13: - initial revision for 2.4.18-pre9 by Robert Schwebel *//* Chip Setup and Control Index Register *//* Chip Setup and Control Data Register *//* Module parameter */static int max_freq;struct s_elan_multiplier { int clock; /* frequency in kHz */ int val40h; /* PMU Force Mode register */ int val80h; /* CPU Clock Speed Register */};/* * It is important that the frequencies * are listed in ascending order here! */static struct s_elan_multiplier elan_multiplier[] = { {1000, 0x02, 0x18}, {2000, 0x02, 0x10}, {4000, 0x02, 0x08}, {8000, 0x00, 0x00}, {16000, 0x00, 0x02}, {33000, 0x00, 0x04}, {66000, 0x01, 0x04}, {99000, 0x01, 0x05}};static struct cpufreq_frequency_table elanfreq_table[] = { {0, 0, 1000}, {0, 1, 2000}, {0, 2, 4000}, {0, 3, 8000}, {0, 4, 16000}, {0, 5, 33000}, {0, 6, 66000}, {0, 7, 99000}, {0, 0, CPUFREQ_TABLE_END},};/** * elanfreq_get_cpu_frequency: determine current cpu speed * * Finds out at which frequency the CPU of the Elan SOC runs * at the moment. Frequencies from 1 to 33 MHz are generated * the normal way, 66 and 99 MHz are called "Hyperspeed Mode" * and have the rest of the chip running with 33 MHz. */static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu){ u8 clockspeed_reg; /* Clock Speed Register */ local_irq_disable(); outb_p(0x80, REG_CSCIR); clockspeed_reg = inb_p(REG_CSCDR); local_irq_enable(); if ((clockspeed_reg & 0xE0) == 0xE0) return 0; /* Are we in CPU clock multiplied mode (66/99 MHz)? */ if ((clockspeed_reg & 0xE0) == 0xC0) { if ((clockspeed_reg & 0x01) == 0) return 66000;