diff options
Diffstat (limited to 'arch/mips/kernel/csrc-powertv.c')
| -rw-r--r-- | arch/mips/kernel/csrc-powertv.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/arch/mips/kernel/csrc-powertv.c b/arch/mips/kernel/csrc-powertv.c deleted file mode 100644 index abd99ea911ae..000000000000 --- a/arch/mips/kernel/csrc-powertv.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * Copyright (C) 2008 Scientific-Atlanta, 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ -/* - * The file comes from kernel/csrc-r4k.c - */ -#include <linux/clocksource.h> -#include <linux/init.h> - -#include <asm/time.h> /* Not included in linux/time.h */ - -#include <asm/mach-powertv/asic_regs.h> -#include "powertv-clock.h" - -/* MIPS PLL Register Definitions */ -#define PLL_GET_M(x) (((x) >> 8) & 0x000000FF) -#define PLL_GET_N(x) (((x) >> 16) & 0x000000FF) -#define PLL_GET_P(x) (((x) >> 24) & 0x00000007) - -/* - * returns: Clock frequency in kHz - */ -unsigned int __init mips_get_pll_freq(void) -{ - unsigned int pll_reg, m, n, p; - unsigned int fin = 54000; /* Base frequency in kHz */ - unsigned int fout; - - /* Read PLL register setting */ - pll_reg = asic_read(mips_pll_setup); - m = PLL_GET_M(pll_reg); - n = PLL_GET_N(pll_reg); - p = PLL_GET_P(pll_reg); - pr_info("MIPS PLL Register:0x%x M=%d N=%d P=%d\n", pll_reg, m, n, p); - - /* Calculate clock frequency = (2 * N * 54MHz) / (M * (2**P)) */ - fout = ((2 * n * fin) / (m * (0x01 << p))); - - pr_info("MIPS Clock Freq=%d kHz\n", fout); - - return fout; -} - -static cycle_t c0_hpt_read(struct clocksource *cs) -{ - return read_c0_count(); -} - -static struct clocksource clocksource_mips = { - .name = "powertv-counter", - .read = c0_hpt_read, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -static void __init powertv_c0_hpt_clocksource_init(void) -{ - unsigned int pll_freq = mips_get_pll_freq(); - - pr_info("CPU frequency %d.%02d MHz\n", pll_freq / 1000, - (pll_freq % 1000) * 100 / 1000); - - mips_hpt_frequency = pll_freq / 2 * 1000; - - clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000; - - clocksource_register_hz(&clocksource_mips, mips_hpt_frequency); -} - -/** - * struct tim_c - free running counter - * @hi: High 16 bits of the counter - * @lo: Low 32 bits of the counter - * - * Lays out the structure of the free running counter in memory. This counter - * increments at a rate of 27 MHz/8 on all platforms. - */ -struct tim_c { - unsigned int hi; - unsigned int lo; -}; - -static struct tim_c *tim_c; - -static cycle_t tim_c_read(struct clocksource *cs) -{ - unsigned int hi; - unsigned int next_hi; - unsigned int lo; - - hi = readl(&tim_c->hi); - - for (;;) { - lo = readl(&tim_c->lo); - next_hi = readl(&tim_c->hi); - if (next_hi == hi) - break; - hi = next_hi; - } - -pr_crit("%s: read %llx\n", __func__, ((u64) hi << 32) | lo); - return ((u64) hi << 32) | lo; -} - -#define TIM_C_SIZE 48 /* # bits in the timer */ - -static struct clocksource clocksource_tim_c = { - .name = "powertv-tim_c", - .read = tim_c_read, - .mask = CLOCKSOURCE_MASK(TIM_C_SIZE), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -/** - * powertv_tim_c_clocksource_init - set up a clock source for the TIM_C clock - * - * We know that TIM_C counts at 27 MHz/8, so each cycle corresponds to - * 1 / (27,000,000/8) seconds. - */ -static void __init powertv_tim_c_clocksource_init(void) -{ - const unsigned long counts_per_second = 27000000 / 8; - - clocksource_tim_c.rating = 200; - - clocksource_register_hz(&clocksource_tim_c, counts_per_second); - tim_c = (struct tim_c *) asic_reg_addr(tim_ch); -} - -/** - powertv_clocksource_init - initialize all clocksources - */ -void __init powertv_clocksource_init(void) -{ - powertv_c0_hpt_clocksource_init(); - powertv_tim_c_clocksource_init(); -} |