clk-44xx.c now contains the clock init functionality for omap4, including DT clock registration and adding of static clkdev entries.
Signed-off-by: Tero Kristo <[email protected]> --- drivers/clk/omap/clk-44xx.c | 118 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) create mode 100644 drivers/clk/omap/clk-44xx.c diff --git a/drivers/clk/omap/clk-44xx.c b/drivers/clk/omap/clk-44xx.c new file mode 100644 index 0000000..cc12134 --- /dev/null +++ b/drivers/clk/omap/clk-44xx.c @@ -0,0 +1,118 @@ +/* + * OMAP4 Clock data + * + * Copyright (C) 2009-2012 Texas Instruments, Inc. + * Copyright (C) 2009-2010 Nokia Corporation + * + * Paul Walmsley ([email protected]) + * Rajendra Nayak ([email protected]) + * Benoit Cousson ([email protected]) + * Mike Turquette ([email protected]) + * + * 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. + * + * XXX Some of the ES1 clocks have been removed/changed; once support + * is added for discriminating clocks by ES level, these should be added back + * in. + * + * XXX All of the remaining MODULEMODE clock nodes should be removed + * once the drivers are updated to use pm_runtime or to use the appropriate + * upstream clock node for rate/parent selection. + */ + +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/clk-private.h> +#include <linux/clkdev.h> +#include <linux/io.h> +#include <linux/clk/omap.h> + +/* + * OMAP4 ABE DPLL default frequency. In OMAP4460 TRM version V, section + * "3.6.3.2.3 CM1_ABE Clock Generator" states that the "DPLL_ABE_X2_CLK + * must be set to 196.608 MHz" and hence, the DPLL locked frequency is + * half of this value. + */ +#define OMAP4_DPLL_ABE_DEFFREQ 98304000 + +/* + * OMAP4 USB DPLL default frequency. In OMAP4430 TRM version V, section + * "3.6.3.9.5 DPLL_USB Preferred Settings" shows that the preferred + * locked frequency for the USB DPLL is 960MHz. + */ +#define OMAP4_DPLL_USB_DEFFREQ 960000000 + +static struct omap_dt_clk omap44xx_clks[] = { + DT_CLK("smp_twd", NULL, "mpu_periphclk"), + DT_CLK("omapdss_dss", "ick", "dss_fck"), + DT_CLK("usbhs_omap", "fs_fck", "usb_host_fs_fck"), + DT_CLK("usbhs_omap", "hs_fck", "usb_host_hs_fck"), + DT_CLK("usbhs_omap", "usbtll_ick", "usb_tll_hs_ick"), + DT_CLK("usbhs_tll", "usbtll_ick", "usb_tll_hs_ick"), + DT_CLK(NULL, "timer_32k_ck", "sys_32k_ck"), + /* TODO: Remove "omap_timer.X" aliases once DT migration is complete */ + DT_CLK("omap_timer.1", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.2", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.3", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.4", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.9", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.10", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.11", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("omap_timer.5", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("omap_timer.6", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("omap_timer.7", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("omap_timer.8", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("4a318000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("48032000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("48034000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("48036000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("4803e000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("48086000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("48088000.timer", "timer_sys_ck", "sys_clkin_ck"), + DT_CLK("40138000.timer", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("4013a000.timer", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("4013c000.timer", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK("4013e000.timer", "timer_sys_ck", "syc_clk_div_ck"), + DT_CLK(NULL, "cpufreq_ck", "dpll_mpu_ck"), +}; + +int __init omap4xxx_clk_init(void) +{ + int rc; + struct clk *abe_dpll_ref, *abe_dpll, *sys_32k_ck, *usb_dpll; + + /* FIXME register clocks from DT first */ + dt_omap_clk_init(); + + omap_dt_clocks_register(omap44xx_clks, ARRAY_SIZE(omap44xx_clks)); + + omap2_clk_disable_autoidle_all(); + + /* + * On OMAP4460 the ABE DPLL fails to turn on if in idle low-power + * state when turning the ABE clock domain. Workaround this by + * locking the ABE DPLL on boot. + * Lock the ABE DPLL in any case to avoid issues with audio. + */ + abe_dpll_ref = clk_get_sys(NULL, "abe_dpll_refclk_mux_ck"); + sys_32k_ck = clk_get_sys(NULL, "sys_32k_ck"); + rc = clk_set_parent(abe_dpll_ref, sys_32k_ck); + abe_dpll = clk_get_sys(NULL, "dpll_abe_ck"); + if (!rc) + rc = clk_set_rate(abe_dpll, OMAP4_DPLL_ABE_DEFFREQ); + if (rc) + pr_err("%s: failed to configure ABE DPLL!\n", __func__); + + /* + * Lock USB DPLL on OMAP4 devices so that the L3INIT power + * domain can transition to retention state when not in use. + */ + usb_dpll = clk_get_sys(NULL, "dpll_usb_ck"); + rc = clk_set_rate(usb_dpll, OMAP4_DPLL_USB_DEFFREQ); + if (rc) + pr_err("%s: failed to configure USB DPLL!\n", __func__); + + return 0; +} -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
