diff options
Diffstat (limited to 'arch/arm/mach-omap2/clock2xxx.c')
| -rw-r--r-- | arch/arm/mach-omap2/clock2xxx.c | 599 |
1 files changed, 23 insertions, 576 deletions
diff --git a/arch/arm/mach-omap2/clock2xxx.c b/arch/arm/mach-omap2/clock2xxx.c index 5420356eb40..80bb0f0e92e 100644 --- a/arch/arm/mach-omap2/clock2xxx.c +++ b/arch/arm/mach-omap2/clock2xxx.c @@ -1,15 +1,15 @@ /* - * linux/arch/arm/mach-omap2/clock.c + * clock2xxx.c - OMAP2xxx-specific clock integration code * - * Copyright (C) 2005-2008 Texas Instruments, Inc. - * Copyright (C) 2004-2008 Nokia Corporation + * Copyright (C) 2005-2008 Texas Instruments, Inc. + * Copyright (C) 2004-2010 Nokia Corporation * - * Contacts: - * Richard Woodruff <r-woodruff2@ti.com> - * Paul Walmsley + * Contacts: + * Richard Woodruff <r-woodruff2@ti.com> + * Paul Walmsley * - * Based on earlier work by Tuukka Tikkanen, Tony Lindgren, - * Gordon McNutt and RidgeRun, Inc. + * 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 @@ -17,568 +17,28 @@ */ #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 <linux/bitops.h> #include <plat/clock.h> -#include <plat/sram.h> -#include <plat/prcm.h> -#include <plat/clkdev_omap.h> -#include <asm/div64.h> -#include <asm/clkdev.h> -#include <plat/sdrc.h> #include "clock.h" #include "clock2xxx.h" -#include "opp2xxx.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 */ - -const struct prcm_config *curr_prcm_set; -const struct prcm_config *rate_table; - struct clk *vclk, *sclk, *dclk; -void __iomem *prcm_clksrc_ctrl; - -/*------------------------------------------------------------------------- - * Omap24xx specific clock functions - *-------------------------------------------------------------------------*/ - -/** - * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS - * @clk: struct clk * being enabled - * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into - * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into - * - * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the - * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function - * passes back the correct CM_IDLEST register address for I2CHS - * modules. No return value. - */ -static void omap2430_clk_i2chs_find_idlest(struct clk *clk, - void __iomem **idlest_reg, - u8 *idlest_bit) -{ - *idlest_reg = OMAP_CM_REGADDR(CORE_MOD, CM_IDLEST); - *idlest_bit = clk->enable_bit; -} - -/* 2430 I2CHS has non-standard IDLEST register */ -const struct clkops clkops_omap2430_i2chs_wait = { - .enable = omap2_dflt_clk_enable, - .disable = omap2_dflt_clk_disable, - .find_idlest = omap2430_clk_i2chs_find_idlest, - .find_companion = omap2_clk_dflt_find_companion, -}; - -/** - * omap2xxx_clk_get_core_rate - return the CORE_CLK rate - * @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck") - * - * Returns the CORE_CLK rate. CORE_CLK can have one of three rate - * sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz - * (the latter is unusual). This currently should be called with - * struct clk *dpll_ck, which is a composite clock of dpll_ck and - * core_ck. - */ -unsigned long omap2xxx_clk_get_core_rate(struct clk *clk) -{ - long long core_clk; - u32 v; - - core_clk = omap2_get_dpll_rate(clk); - - v = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - v &= OMAP24XX_CORE_CLK_SRC_MASK; - - if (v == CORE_CLK_SRC_32K) - core_clk = 32768; - else - core_clk *= v; - - return core_clk; -} - -static int omap2_enable_osc_ck(struct clk *clk) -{ - u32 pcc; - - pcc = __raw_readl(prcm_clksrc_ctrl); - - __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl); - - return 0; -} - -static void omap2_disable_osc_ck(struct clk *clk) -{ - u32 pcc; - - pcc = __raw_readl(prcm_clksrc_ctrl); - - __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl); -} - -const struct clkops clkops_oscck = { - .enable = omap2_enable_osc_ck, - .disable = omap2_disable_osc_ck, -}; - -#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_apll_enable(struct clk *clk, u32 status_mask) -{ - 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); - - omap2_cm_wait_idlest(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), status_mask, - clk->name); - - /* - * REVISIT: Should we return an error code if omap2_wait_clock_ready() - * fails? - */ - return 0; -} - -static int omap2_clk_apll96_enable(struct clk *clk) -{ - return omap2_clk_apll_enable(clk, OMAP24XX_ST_96M_APLL); -} - -static int omap2_clk_apll54_enable(struct clk *clk) -{ - return omap2_clk_apll_enable(clk, OMAP24XX_ST_54M_APLL); -} - -/* Stop APLL */ -static void omap2_clk_apll_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); -} - -const struct clkops clkops_apll96 = { - .enable = omap2_clk_apll96_enable, - .disable = omap2_clk_apll_disable, -}; - -const struct clkops clkops_apll54 = { - .enable = omap2_clk_apll54_enable, - .disable = omap2_clk_apll_disable, -}; - -/* - * 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 - -} - -unsigned long omap2_dpllcore_recalc(struct clk *clk) -{ - return omap2xxx_clk_get_core_rate(clk); -} - -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; - - cur_rate = omap2xxx_clk_get_core_rate(dclk); - mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - mult &= OMAP24XX_CORE_CLK_SRC_MASK; - - if ((rate == (cur_rate / 2)) && (mult == 2)) { - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1); - } else if ((rate == (cur_rate * 2)) && (mult == 1)) { - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); - } else if (rate != cur_rate) { - valid_rate = omap2_dpllcore_round_rate(rate); - if (valid_rate != rate) - return -EINVAL; - - if (mult == 1) - low = curr_prcm_set->dpll_speed; - else - low = curr_prcm_set->dpll_speed / 2; - - dd = clk->dpll_data; - if (!dd) - return -EINVAL; - - 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; - - /* For omap2xxx_sdrc_init_params() */ - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); - - /* Force dll lock mode */ - omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr, - bypass); - - /* Errata: ret dll entry state */ - omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked()); - omap2xxx_sdrc_reprogram(done_rate, 0); - } - - return 0; -} - -/** - * 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. - */ -unsigned long omap2_table_mpu_recalc(struct clk *clk) -{ - return 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. - */ -long omap2_round_to_table_rate(struct clk *clk, unsigned long rate) -{ - const struct prcm_config *ptr; - long highest_rate; - long sys_ck_rate; - - sys_ck_rate = clk_get_rate(sclk); - - 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 */ -int omap2_select_table_rate(struct clk *clk, unsigned long rate) -{ - u32 cur_rate, done_rate, bypass = 0, tmp; - const struct prcm_config *prcm; - unsigned long found_speed = 0; - unsigned long flags; - long sys_ck_rate; - - sys_ck_rate = clk_get_rate(sclk); - - 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 = omap2xxx_clk_get_core_rate(dclk); - - if (prcm->dpll_speed == cur_rate / 2) { - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1); - } else if (prcm->dpll_speed == cur_rate * 2) { - omap2xxx_sdrc_reprogram(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 omap2xxx_sdrc_init_params() */ - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); - - omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr, - bypass); - - omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked()); - omap2xxx_sdrc_reprogram(done_rate, 0); - - local_irq_restore(flags); - } - - return 0; -} - -#ifdef CONFIG_CPU_FREQ /* - * Walk PRCM rate table and fillout cpufreq freq_table - * XXX This should be replaced by an OPP layer in the near future + * Omap24xx specific clock functions */ -static struct cpufreq_frequency_table *freq_table; - -void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table) -{ - const struct prcm_config *prcm; - long sys_ck_rate; - int i = 0; - int tbl_sz = 0; - - sys_ck_rate = clk_get_rate(sclk); - - for (prcm = rate_table; prcm->mpu_speed; prcm++) { - if (!(prcm->flags & cpu_mask)) - continue; - if (prcm->xtal_speed != sys_ck_rate) - continue; - - /* don't put bypass rates in table */ - if (prcm->dpll_speed == prcm->xtal_speed) - continue; - - tbl_sz++; - } - - /* - * XXX Ensure that we're doing what CPUFreq expects for this error - * case and the following one - */ - if (tbl_sz == 0) { - pr_warning("%s: no matching entries in rate_table\n", - __func__); - return; - } - - /* Include the CPUFREQ_TABLE_END terminator entry */ - tbl_sz++; - - freq_table = kzalloc(sizeof(struct cpufreq_frequency_table) * tbl_sz, - GFP_ATOMIC); - if (!freq_table) { - pr_err("%s: could not kzalloc frequency table\n", __func__); - return; - } - - for (prcm = rate_table; prcm->mpu_speed; prcm++) { - if (!(prcm->flags & cpu_mask)) - continue; - if (prcm->xtal_speed != sys_ck_rate) - continue; - - /* don't put bypass rates in table */ - if (prcm->dpll_speed == prcm->xtal_speed) - continue; - - freq_table[i].index = i; - freq_table[i].frequency = prcm->mpu_speed / 1000; - i++; - } - - freq_table[i].index = i; - freq_table[i].frequency = CPUFREQ_TABLE_END; - - *table = &freq_table[0]; -} - -void omap2_clk_exit_cpufreq_table(struct cpufreq_frequency_table **table) -{ - kfree(freq_table); -} - -#endif - -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, -#ifdef CONFIG_CPU_FREQ - .clk_init_cpufreq_table = omap2_clk_init_cpufreq_table, - .clk_exit_cpufreq_table = omap2_clk_exit_cpufreq_table, -#endif -}; - -static u32 omap2_get_apll_clkin(void) -{ - u32 aplls, srate = 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) - srate = 19200000; - else if (aplls == APLLS_CLKIN_13MHZ) - srate = 13000000; - else if (aplls == APLLS_CLKIN_12MHZ) - srate = 12000000; - - return srate; -} - -static u32 omap2_get_sysclkdiv(void) -{ - u32 div; - - div = __raw_readl(prcm_clksrc_ctrl); - div &= OMAP_SYSCLKDIV_MASK; - div >>= OMAP_SYSCLKDIV_SHIFT; - - return div; -} - -unsigned long omap2_osc_clk_recalc(struct clk *clk) -{ - return omap2_get_apll_clkin() * omap2_get_sysclkdiv(); -} - -unsigned long omap2_sys_clk_recalc(struct clk *clk) -{ - return clk->parent->rate / omap2_get_sysclkdiv(); -} /* * Set clocks for bypass mode for reboot to work. */ -void omap2_clk_prepare_for_reboot(void) +void omap2xxx_clk_prepare_for_reboot(void) { u32 rate; @@ -590,37 +50,24 @@ void omap2_clk_prepare_for_reboot(void) } /* - * Switch the MPU rate if specified on cmdline. - * We cannot do this early until cmdline is parsed. + * Switch the MPU rate if specified on cmdline. We cannot do this + * early until cmdline is parsed. XXX This should be removed from the + * clock code and handled by the OPP layer code in the near future. */ -static int __init omap2_clk_arch_init(void) +static int __init omap2xxx_clk_arch_init(void) { - struct clk *virt_prcm_set, *sys_ck, *dpll_ck, *mpu_ck; - unsigned long sys_ck_rate; + int ret; - if (!mpurate) - return -EINVAL; + if (!cpu_is_omap24xx()) + return 0; - virt_prcm_set = clk_get(NULL, "virt_prcm_set"); - sys_ck = clk_get(NULL, "sys_ck"); - dpll_ck = clk_get(NULL, "dpll_ck"); - mpu_ck = clk_get(NULL, "mpu_ck"); + ret = omap2_clk_switch_mpurate_at_boot("virt_prcm_set"); + if (!ret) + omap2_clk_print_new_rates("sys_ck", "dpll_ck", "mpu_ck"); - if (clk_set_rate(virt_prcm_set, mpurate)) - printk(KERN_ERR "Could not find matching MPU rate\n"); - - recalculate_root_clocks(); - - sys_ck_rate = clk_get_rate(sys_ck); - - pr_info("Switched to new clocking rate (Crystal/DPLL/MPU): " - "%ld.%01ld/%ld/%ld MHz\n", - (sys_ck_rate / 1000000), (sys_ck_rate / 100000) % 10, - (clk_get_rate(dpll_ck) / 1000000), - (clk_get_rate(mpu_ck) / 1000000)); - - return 0; + return ret; } -arch_initcall(omap2_clk_arch_init); + +arch_initcall(omap2xxx_clk_arch_init); |