diff options
Diffstat (limited to 'arch/arm/mach-omap2/clock3xxx.c')
| -rw-r--r-- | arch/arm/mach-omap2/clock3xxx.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock3xxx.c b/arch/arm/mach-omap2/clock3xxx.c new file mode 100644 index 000000000000..d142457cd041 --- /dev/null +++ b/arch/arm/mach-omap2/clock3xxx.c @@ -0,0 +1,145 @@ +/* + * OMAP3-specific clock framework functions + * + * Copyright (C) 2007-2008 Texas Instruments, Inc. + * Copyright (C) 2007-2010 Nokia Corporation + * + * Paul Walmsley + * Jouni Högander + * + * 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/kernel.h> +#include <linux/errno.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/err.h> + +#include <plat/cpu.h> +#include <plat/clock.h> + +#include "clock.h" +#include "clock3xxx.h" +#include "prm.h" +#include "prm-regbits-34xx.h" +#include "cm.h" +#include "cm-regbits-34xx.h" + +/* + * DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks + * that are sourced by DPLL5, and both of these require this clock + * to be at 120 MHz for proper operation. + */ +#define DPLL5_FREQ_FOR_USBHOST 120000000 + +/* needed by omap3_core_dpll_m2_set_rate() */ +struct clk *sdrc_ick_p, *arm_fck_p; + +int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate) +{ + /* + * According to the 12-5 CDP code from TI, "Limitation 2.5" + * on 3430ES1 prevents us from changing DPLL multipliers or dividers + * on DPLL4. + */ + if (omap_rev() == OMAP3430_REV_ES1_0) { + pr_err("clock: DPLL4 cannot change rate due to " + "silicon 'Limitation 2.5' on 3430ES1.\n"); + return -EINVAL; + } + + return omap3_noncore_dpll_set_rate(clk, rate); +} + +void __init omap3_clk_lock_dpll5(void) +{ + struct clk *dpll5_clk; + struct clk *dpll5_m2_clk; + + dpll5_clk = clk_get(NULL, "dpll5_ck"); + clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST); + clk_enable(dpll5_clk); + + /* Enable autoidle to allow it to enter low power bypass */ + omap3_dpll_allow_idle(dpll5_clk); + + /* Program dpll5_m2_clk divider for no division */ + dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck"); + clk_enable(dpll5_m2_clk); + clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST); + + clk_disable(dpll5_m2_clk); + clk_disable(dpll5_clk); + return; +} + +/* Common clock code */ + +/* 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 omap3xxx_clk_arch_init(void) +{ + struct clk *osc_sys_ck, *dpll1_ck, *arm_fck, *core_ck; + unsigned long osc_sys_rate; + bool err = 0; + + if (!cpu_is_omap34xx()) + return 0; + + if (!mpurate) + return -EINVAL; + + /* XXX test these for success */ + dpll1_ck = clk_get(NULL, "dpll1_ck"); + if (WARN(IS_ERR(dpll1_ck), "Failed to get dpll1_ck.\n")) + err = 1; + + arm_fck = clk_get(NULL, "arm_fck"); + if (WARN(IS_ERR(arm_fck), "Failed to get arm_fck.\n")) + err = 1; + + core_ck = clk_get(NULL, "core_ck"); + if (WARN(IS_ERR(core_ck), "Failed to get core_ck.\n")) + err = 1; + + osc_sys_ck = clk_get(NULL, "osc_sys_ck"); + if (WARN(IS_ERR(osc_sys_ck), "Failed to get osc_sys_ck.\n")) + err = 1; + + if (err) + return -ENOENT; + + /* REVISIT: not yet ready for 343x */ + if (clk_set_rate(dpll1_ck, mpurate)) + printk(KERN_ERR "*** Unable to set MPU rate\n"); + + recalculate_root_clocks(); + + osc_sys_rate = clk_get_rate(osc_sys_ck); + + pr_info("Switched to new clocking rate (Crystal/Core/MPU): " + "%ld.%01ld/%ld/%ld MHz\n", + (osc_sys_rate / 1000000), + ((osc_sys_rate / 100000) % 10), + (clk_get_rate(core_ck) / 1000000), + (clk_get_rate(arm_fck) / 1000000)); + + calibrate_delay(); + + return 0; +} +arch_initcall(omap3xxx_clk_arch_init); + + |