diff options
Diffstat (limited to 'arch/arm/mach-omap2/clock24xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/clock24xx.c | 539 |
1 files changed, 0 insertions, 539 deletions
diff --git a/arch/arm/mach-omap2/clock24xx.c b/arch/arm/mach-omap2/clock24xx.c deleted file mode 100644 index aa567876651..00000000000 --- a/arch/arm/mach-omap2/clock24xx.c +++ /dev/null @@ -1,539 +0,0 @@ -/* - * linux/arch/arm/mach-omap2/clock.c - * - * Copyright (C) 2005-2008 Texas Instruments, Inc. - * Copyright (C) 2004-2008 Nokia Corporation - * - * Contacts: - * Richard Woodruff <r-woodruff2@ti.com> - * Paul Walmsley - * - * Based on earlier work by Tuukka Tikkanen, Tony Lindgren, - * Gordon McNutt and RidgeRun, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#undef DEBUG - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/device.h> -#include <linux/list.h> -#include <linux/errno.h> -#include <linux/delay.h> -#include <linux/clk.h> - -#include <linux/io.h> -#include <linux/cpufreq.h> - -#include <asm/arch/clock.h> -#include <asm/arch/sram.h> -#include <asm/div64.h> -#include <asm/bitops.h> - -#include "memory.h" -#include "clock.h" -#include "clock24xx.h" -#include "prm.h" -#include "prm-regbits-24xx.h" -#include "cm.h" -#include "cm-regbits-24xx.h" - -/* CM_CLKEN_PLL.EN_{54,96}M_PLL options (24XX) */ -#define EN_APLL_STOPPED 0 -#define EN_APLL_LOCKED 3 - -/* CM_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */ -#define APLLS_CLKIN_19_2MHZ 0 -#define APLLS_CLKIN_13MHZ 2 -#define APLLS_CLKIN_12MHZ 3 - -/* #define DOWN_VARIABLE_DPLL 1 */ /* Experimental */ - -static struct prcm_config *curr_prcm_set; -static struct clk *vclk; -static struct clk *sclk; - -/*------------------------------------------------------------------------- - * Omap24xx specific clock functions - *-------------------------------------------------------------------------*/ - -/* This actually returns the rate of core_ck, not dpll_ck. */ -static u32 omap2_get_dpll_rate_24xx(struct clk *tclk) -{ - long long dpll_clk; - u8 amult; - - dpll_clk = omap2_get_dpll_rate(tclk); - - amult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - amult &= OMAP24XX_CORE_CLK_SRC_MASK; - dpll_clk *= amult; - - return dpll_clk; -} - -static int omap2_enable_osc_ck(struct clk *clk) -{ - u32 pcc; - - pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL); - - __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, - OMAP24XX_PRCM_CLKSRC_CTRL); - - return 0; -} - -static void omap2_disable_osc_ck(struct clk *clk) -{ - u32 pcc; - - pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL); - - __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, - OMAP24XX_PRCM_CLKSRC_CTRL); -} - -#ifdef OLD_CK -/* Recalculate SYST_CLK */ -static void omap2_sys_clk_recalc(struct clk * clk) -{ - u32 div = PRCM_CLKSRC_CTRL; - div &= (1 << 7) | (1 << 6); /* Test if ext clk divided by 1 or 2 */ - div >>= clk->rate_offset; - clk->rate = (clk->parent->rate / div); - propagate_rate(clk); -} -#endif /* OLD_CK */ - -/* Enable an APLL if off */ -static int omap2_clk_fixed_enable(struct clk *clk) -{ - u32 cval, apll_mask; - - apll_mask = EN_APLL_LOCKED << clk->enable_bit; - - cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN); - - if ((cval & apll_mask) == apll_mask) - return 0; /* apll already enabled */ - - cval &= ~apll_mask; - cval |= apll_mask; - cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN); - - if (clk == &apll96_ck) - cval = OMAP24XX_ST_96M_APLL; - else if (clk == &apll54_ck) - cval = OMAP24XX_ST_54M_APLL; - - omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval, - clk->name); - - /* - * REVISIT: Should we return an error code if omap2_wait_clock_ready() - * fails? - */ - return 0; -} - -/* Stop APLL */ -static void omap2_clk_fixed_disable(struct clk *clk) -{ - u32 cval; - - cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN); - cval &= ~(EN_APLL_LOCKED << clk->enable_bit); - cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN); -} - -/* - * Uses the current prcm set to tell if a rate is valid. - * You can go slower, but not faster within a given rate set. - */ -long omap2_dpllcore_round_rate(unsigned long target_rate) -{ - u32 high, low, core_clk_src; - - core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK; - - if (core_clk_src == CORE_CLK_SRC_DPLL) { /* DPLL clockout */ - high = curr_prcm_set->dpll_speed * 2; - low = curr_prcm_set->dpll_speed; - } else { /* DPLL clockout x 2 */ - high = curr_prcm_set->dpll_speed; - low = curr_prcm_set->dpll_speed / 2; - } - -#ifdef DOWN_VARIABLE_DPLL - if (target_rate > high) - return high; - else - return target_rate; -#else - if (target_rate > low) - return high; - else - return low; -#endif - -} - -static void omap2_dpllcore_recalc(struct clk *clk) -{ - clk->rate = omap2_get_dpll_rate_24xx(clk); - - propagate_rate(clk); -} - -static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate) -{ - u32 cur_rate, low, mult, div, valid_rate, done_rate; - u32 bypass = 0; - struct prcm_config tmpset; - const struct dpll_data *dd; - unsigned long flags; - int ret = -EINVAL; - - local_irq_save(flags); - cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck); - mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - mult &= OMAP24XX_CORE_CLK_SRC_MASK; - - if ((rate == (cur_rate / 2)) && (mult == 2)) { - omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1); - } else if ((rate == (cur_rate * 2)) && (mult == 1)) { - omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); - } else if (rate != cur_rate) { - valid_rate = omap2_dpllcore_round_rate(rate); - if (valid_rate != rate) - goto dpll_exit; - - if (mult == 1) - low = curr_prcm_set->dpll_speed; - else - low = curr_prcm_set->dpll_speed / 2; - - dd = clk->dpll_data; - if (!dd) - goto dpll_exit; - - tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg); - tmpset.cm_clksel1_pll &= ~(dd->mult_mask | - dd->div1_mask); - div = ((curr_prcm_set->xtal_speed / 1000000) - 1); - tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK; - if (rate > low) { - tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2; - mult = ((rate / 2) / 1000000); - done_rate = CORE_CLK_SRC_DPLL_X2; - } else { - tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL; - mult = (rate / 1000000); - done_rate = CORE_CLK_SRC_DPLL; - } - tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask)); - tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask)); - - /* Worst case */ - tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS; - - if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */ - bypass = 1; - - omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); /* For init_mem */ - - /* Force dll lock mode */ - omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr, - bypass); - - /* Errata: ret dll entry state */ - omap2_init_memory_params(omap2_dll_force_needed()); - omap2_reprogram_sdrc(done_rate, 0); - } - omap2_dpllcore_recalc(&dpll_ck); - ret = 0; - -dpll_exit: - local_irq_restore(flags); - return(ret); -} - -/** - * omap2_table_mpu_recalc - just return the MPU speed - * @clk: virt_prcm_set struct clk - * - * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set. - */ -static void omap2_table_mpu_recalc(struct clk *clk) -{ - clk->rate = curr_prcm_set->mpu_speed; -} - -/* - * Look for a rate equal or less than the target rate given a configuration set. - * - * What's not entirely clear is "which" field represents the key field. - * Some might argue L3-DDR, others ARM, others IVA. This code is simple and - * just uses the ARM rates. - */ -static long omap2_round_to_table_rate(struct clk *clk, unsigned long rate) -{ - struct prcm_config *ptr; - long highest_rate; - - if (clk != &virt_prcm_set) - return -EINVAL; - - highest_rate = -EINVAL; - - for (ptr = rate_table; ptr->mpu_speed; ptr++) { - if (!(ptr->flags & cpu_mask)) - continue; - if (ptr->xtal_speed != sys_ck.rate) - continue; - - highest_rate = ptr->mpu_speed; - - /* Can check only after xtal frequency check */ - if (ptr->mpu_speed <= rate) - break; - } - return highest_rate; -} - -/* Sets basic clocks based on the specified rate */ -static int omap2_select_table_rate(struct clk *clk, unsigned long rate) -{ - u32 cur_rate, done_rate, bypass = 0, tmp; - struct prcm_config *prcm; - unsigned long found_speed = 0; - unsigned long flags; - - if (clk != &virt_prcm_set) - return -EINVAL; - - for (prcm = rate_table; prcm->mpu_speed; prcm++) { - if (!(prcm->flags & cpu_mask)) - continue; - - if (prcm->xtal_speed != sys_ck.rate) - continue; - - if (prcm->mpu_speed <= rate) { - found_speed = prcm->mpu_speed; - break; - } - } - - if (!found_speed) { - printk(KERN_INFO "Could not set MPU rate to %luMHz\n", - rate / 1000000); - return -EINVAL; - } - - curr_prcm_set = prcm; - cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck); - - if (prcm->dpll_speed == cur_rate / 2) { - omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1); - } else if (prcm->dpll_speed == cur_rate * 2) { - omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); - } else if (prcm->dpll_speed != cur_rate) { - local_irq_save(flags); - - if (prcm->dpll_speed == prcm->xtal_speed) - bypass = 1; - - if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) == - CORE_CLK_SRC_DPLL_X2) - done_rate = CORE_CLK_SRC_DPLL_X2; - else - done_rate = CORE_CLK_SRC_DPLL; - - /* MPU divider */ - cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL); - - /* dsp + iva1 div(2420), iva2.1(2430) */ - cm_write_mod_reg(prcm->cm_clksel_dsp, - OMAP24XX_DSP_MOD, CM_CLKSEL); - - cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL); - - /* Major subsystem dividers */ - tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK; - cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD, CM_CLKSEL1); - if (cpu_is_omap2430()) - cm_write_mod_reg(prcm->cm_clksel_mdm, - OMAP2430_MDM_MOD, CM_CLKSEL); - - /* x2 to enter init_mem */ - omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); - - omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr, - bypass); - - omap2_init_memory_params(omap2_dll_force_needed()); - omap2_reprogram_sdrc(done_rate, 0); - - local_irq_restore(flags); - } - omap2_dpllcore_recalc(&dpll_ck); - - return 0; -} - -static struct clk_functions omap2_clk_functions = { - .clk_enable = omap2_clk_enable, - .clk_disable = omap2_clk_disable, - .clk_round_rate = omap2_clk_round_rate, - .clk_set_rate = omap2_clk_set_rate, - .clk_set_parent = omap2_clk_set_parent, - .clk_disable_unused = omap2_clk_disable_unused, -}; - -static u32 omap2_get_apll_clkin(void) -{ - u32 aplls, sclk = 0; - - aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1); - aplls &= OMAP24XX_APLLS_CLKIN_MASK; - aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT; - - if (aplls == APLLS_CLKIN_19_2MHZ) - sclk = 19200000; - else if (aplls == APLLS_CLKIN_13MHZ) - sclk = 13000000; - else if (aplls == APLLS_CLKIN_12MHZ) - sclk = 12000000; - - return sclk; -} - -static u32 omap2_get_sysclkdiv(void) -{ - u32 div; - - div = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL); - div &= OMAP_SYSCLKDIV_MASK; - div >>= OMAP_SYSCLKDIV_SHIFT; - - return div; -} - -static void omap2_osc_clk_recalc(struct clk *clk) -{ - clk->rate = omap2_get_apll_clkin() * omap2_get_sysclkdiv(); - propagate_rate(clk); -} - -static void omap2_sys_clk_recalc(struct clk *clk) -{ - clk->rate = clk->parent->rate / omap2_get_sysclkdiv(); - propagate_rate(clk); -} - -/* - * Set clocks for bypass mode for reboot to work. - */ -void omap2_clk_prepare_for_reboot(void) -{ - u32 rate; - - if (vclk == NULL || sclk == NULL) - return; - - rate = clk_get_rate(sclk); - clk_set_rate(vclk, rate); -} - -/* - * Switch the MPU rate if specified on cmdline. - * We cannot do this early until cmdline is parsed. - */ -static int __init omap2_clk_arch_init(void) -{ - if (!mpurate) - return -EINVAL; - - if (omap2_select_table_rate(&virt_prcm_set, mpurate)) - printk(KERN_ERR "Could not find matching MPU rate\n"); - - recalculate_root_clocks(); - - printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): " - "%ld.%01ld/%ld/%ld MHz\n", - (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10, - (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ; - - return 0; -} -arch_initcall(omap2_clk_arch_init); - -int __init omap2_clk_init(void) -{ - struct prcm_config *prcm; - struct clk **clkp; - u32 clkrate; - - if (cpu_is_omap242x()) - cpu_mask = RATE_IN_242X; - else if (cpu_is_omap2430()) - cpu_mask = RATE_IN_243X; - - clk_init(&omap2_clk_functions); - - omap2_osc_clk_recalc(&osc_ck); - omap2_sys_clk_recalc(&sys_ck); - - for (clkp = onchip_24xx_clks; - clkp < onchip_24xx_clks + ARRAY_SIZE(onchip_24xx_clks); - clkp++) { - - if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) { - clk_register(*clkp); - continue; - } - - if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) { - clk_register(*clkp); - continue; - } - } - - /* Check the MPU rate set by bootloader */ - clkrate = omap2_get_dpll_rate_24xx(&dpll_ck); - for (prcm = rate_table; prcm->mpu_speed; prcm++) { - if (!(prcm->flags & cpu_mask)) - continue; - if (prcm->xtal_speed != sys_ck.rate) - continue; - if (prcm->dpll_speed <= clkrate) - break; - } - curr_prcm_set = prcm; - - recalculate_root_clocks(); - - printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): " - "%ld.%01ld/%ld/%ld MHz\n", - (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10, - (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ; - - /* - * Only enable those clocks we will need, let the drivers - * enable other clocks as necessary - */ - clk_enable_init_clocks(); - - /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */ - vclk = clk_get(NULL, "virt_prcm_set"); - sclk = clk_get(NULL, "sys_ck"); - - return 0; -} |