diff options
Diffstat (limited to 'arch/arm/mach-omap2/clock34xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/clock34xx.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c new file mode 100644 index 000000000000..b42bdd6079a5 --- /dev/null +++ b/arch/arm/mach-omap2/clock34xx.c @@ -0,0 +1,235 @@ +/* + * OMAP3-specific clock framework functions + * + * Copyright (C) 2007 Texas Instruments, Inc. + * Copyright (C) 2007 Nokia Corporation + * + * Written by Paul Walmsley + * + * Parts of this code are based on code written by + * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu + * + * 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 <asm/arch/clock.h> +#include <asm/arch/sram.h> +#include <asm/div64.h> +#include <asm/bitops.h> + +#include "memory.h" +#include "clock.h" +#include "clock34xx.h" +#include "prm.h" +#include "prm-regbits-34xx.h" +#include "cm.h" +#include "cm-regbits-34xx.h" + +/* CM_CLKEN_PLL*.EN* bit values */ +#define DPLL_LOCKED 0x7 + +/** + * omap3_dpll_recalc - recalculate DPLL rate + * @clk: DPLL struct clk + * + * Recalculate and propagate the DPLL rate. + */ +static void omap3_dpll_recalc(struct clk *clk) +{ + clk->rate = omap2_get_dpll_rate(clk); + + propagate_rate(clk); +} + +/** + * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate + * @clk: DPLL output struct clk + * + * Using parent clock DPLL data, look up DPLL state. If locked, set our + * rate to the dpll_clk * 2; otherwise, just use dpll_clk. + */ +static void omap3_clkoutx2_recalc(struct clk *clk) +{ + const struct dpll_data *dd; + u32 v; + struct clk *pclk; + + /* Walk up the parents of clk, looking for a DPLL */ + pclk = clk->parent; + while (pclk && !pclk->dpll_data) + pclk = pclk->parent; + + /* clk does not have a DPLL as a parent? */ + WARN_ON(!pclk); + + dd = pclk->dpll_data; + + WARN_ON(!dd->control_reg || !dd->enable_mask); + + v = __raw_readl(dd->control_reg) & dd->enable_mask; + v >>= __ffs(dd->enable_mask); + if (v != DPLL_LOCKED) + clk->rate = clk->parent->rate; + else + clk->rate = clk->parent->rate * 2; + + if (clk->flags & RATE_PROPAGATES) + propagate_rate(clk); +} + +/* + * As it is structured now, this will prevent an OMAP2/3 multiboot + * kernel from compiling. This will need further attention. + */ +#if defined(CONFIG_ARCH_OMAP3) + +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, +}; + +/* + * Set clocks for bypass mode for reboot to work. + */ +void omap2_clk_prepare_for_reboot(void) +{ + /* REVISIT: Not ready for 343x */ +#if 0 + u32 rate; + + if (vclk == NULL || sclk == NULL) + return; + + rate = clk_get_rate(sclk); + clk_set_rate(vclk, rate); +#endif +} + +/* REVISIT: Move this init stuff out into clock.c */ + +/* + * 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; + + /* REVISIT: not yet ready for 343x */ +#if 0 + if (omap2_select_table_rate(&virt_prcm_set, mpurate)) + printk(KERN_ERR "Could not find matching MPU rate\n"); +#endif + + recalculate_root_clocks(); + + printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): " + "%ld.%01ld/%ld/%ld MHz\n", + (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10, + (core_ck.rate / 1000000), (dpll1_fck.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; */ + u32 cpu_clkflg; + + /* REVISIT: Ultimately this will be used for multiboot */ +#if 0 + if (cpu_is_omap242x()) { + cpu_mask = RATE_IN_242X; + cpu_clkflg = CLOCK_IN_OMAP242X; + clkp = onchip_24xx_clks; + } else if (cpu_is_omap2430()) { + cpu_mask = RATE_IN_243X; + cpu_clkflg = CLOCK_IN_OMAP243X; + clkp = onchip_24xx_clks; + } +#endif + if (cpu_is_omap34xx()) { + cpu_mask = RATE_IN_343X; + cpu_clkflg = CLOCK_IN_OMAP343X; + clkp = onchip_34xx_clks; + + /* + * Update this if there are further clock changes between ES2 + * and production parts + */ + if (is_sil_rev_equal_to(OMAP3430_REV_ES1_0)) { + /* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */ + cpu_clkflg |= CLOCK_IN_OMAP3430ES1; + } else { + cpu_mask |= RATE_IN_3430ES2; + cpu_clkflg |= CLOCK_IN_OMAP3430ES2; + } + } + + clk_init(&omap2_clk_functions); + + for (clkp = onchip_34xx_clks; + clkp < onchip_34xx_clks + ARRAY_SIZE(onchip_34xx_clks); + clkp++) { + if ((*clkp)->flags & cpu_clkflg) + clk_register(*clkp); + } + + /* REVISIT: Not yet ready for OMAP3 */ +#if 0 + /* 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; +#endif + + recalculate_root_clocks(); + + printk(KERN_INFO "Clocking rate (Crystal/DPLL/ARM core): " + "%ld.%01ld/%ld/%ld MHz\n", + (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10, + (core_ck.rate / 1000000), (arm_fck.rate / 1000000)); + + /* + * Only enable those clocks we will need, let the drivers + * enable other clocks as necessary + */ + clk_enable_init_clocks(); + + /* Avoid sleeping during omap2_clk_prepare_for_reboot() */ + /* REVISIT: not yet ready for 343x */ +#if 0 + vclk = clk_get(NULL, "virt_prcm_set"); + sclk = clk_get(NULL, "sys_ck"); +#endif + return 0; +} + +#endif |