drivers/clk/ti/clk-33xx.c - arm/linux-arm-legacy - Git at Google

 /*
  * AM33XX Clock init
  *
  * Copyright (C) 2013 Texas Instruments, Inc
  *     Tero Kristo (t-kristo@ti.com)
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/clk-provider.h>
 #include <linux/clk/ti.h>

 static struct ti_dt_clk am33xx_clks[] = {
 	DT_CLK(NULL, "clk_32768_ck", "clk_32768_ck"),
 	DT_CLK(NULL, "clk_rc32k_ck", "clk_rc32k_ck"),
 	DT_CLK(NULL, "virt_19200000_ck", "virt_19200000_ck"),
 	DT_CLK(NULL, "virt_24000000_ck", "virt_24000000_ck"),
 	DT_CLK(NULL, "virt_25000000_ck", "virt_25000000_ck"),
 	DT_CLK(NULL, "virt_26000000_ck", "virt_26000000_ck"),
 	DT_CLK(NULL, "sys_clkin_ck", "sys_clkin_ck"),
 	DT_CLK(NULL, "tclkin_ck", "tclkin_ck"),
 	DT_CLK(NULL, "dpll_core_ck", "dpll_core_ck"),
 	DT_CLK(NULL, "dpll_core_x2_ck", "dpll_core_x2_ck"),
 	DT_CLK(NULL, "dpll_core_m4_ck", "dpll_core_m4_ck"),
 	DT_CLK(NULL, "dpll_core_m5_ck", "dpll_core_m5_ck"),
 	DT_CLK(NULL, "dpll_core_m6_ck", "dpll_core_m6_ck"),
 	DT_CLK(NULL, "dpll_mpu_ck", "dpll_mpu_ck"),
 	DT_CLK("cpu0", NULL, "dpll_mpu_ck"),
 	DT_CLK(NULL, "dpll_mpu_m2_ck", "dpll_mpu_m2_ck"),
 	DT_CLK(NULL, "dpll_ddr_ck", "dpll_ddr_ck"),
 	DT_CLK(NULL, "dpll_ddr_m2_ck", "dpll_ddr_m2_ck"),
 	DT_CLK(NULL, "dpll_ddr_m2_div2_ck", "dpll_ddr_m2_div2_ck"),
 	DT_CLK(NULL, "dpll_disp_ck", "dpll_disp_ck"),
 	DT_CLK(NULL, "dpll_disp_m2_ck", "dpll_disp_m2_ck"),
 	DT_CLK(NULL, "dpll_per_ck", "dpll_per_ck"),
 	DT_CLK(NULL, "dpll_per_m2_ck", "dpll_per_m2_ck"),
 	DT_CLK(NULL, "dpll_per_m2_div4_wkupdm_ck", "dpll_per_m2_div4_wkupdm_ck"),
 	DT_CLK(NULL, "dpll_per_m2_div4_ck", "dpll_per_m2_div4_ck"),
 	DT_CLK(NULL, "adc_tsc_fck", "adc_tsc_fck"),
 	DT_CLK(NULL, "cefuse_fck", "cefuse_fck"),
 	DT_CLK(NULL, "clkdiv32k_ck", "clkdiv32k_ck"),
 	DT_CLK(NULL, "clkdiv32k_ick", "clkdiv32k_ick"),
 	DT_CLK(NULL, "dcan0_fck", "dcan0_fck"),
 	DT_CLK("481cc000.d_can", NULL, "dcan0_fck"),
 	DT_CLK(NULL, "dcan1_fck", "dcan1_fck"),
 	DT_CLK("481d0000.d_can", NULL, "dcan1_fck"),
 	DT_CLK(NULL, "pruss_ocp_gclk", "pruss_ocp_gclk"),
 	DT_CLK(NULL, "mcasp0_fck", "mcasp0_fck"),
 	DT_CLK(NULL, "mcasp1_fck", "mcasp1_fck"),
 	DT_CLK(NULL, "mmu_fck", "mmu_fck"),
 	DT_CLK(NULL, "smartreflex0_fck", "smartreflex0_fck"),
 	DT_CLK(NULL, "smartreflex1_fck", "smartreflex1_fck"),
 	DT_CLK(NULL, "sha0_fck", "sha0_fck"),
 	DT_CLK(NULL, "aes0_fck", "aes0_fck"),
 	DT_CLK(NULL, "rng_fck", "rng_fck"),
 	DT_CLK(NULL, "timer1_fck", "timer1_fck"),
 	DT_CLK(NULL, "timer2_fck", "timer2_fck"),
 	DT_CLK(NULL, "timer3_fck", "timer3_fck"),
 	DT_CLK(NULL, "timer4_fck", "timer4_fck"),
 	DT_CLK(NULL, "timer5_fck", "timer5_fck"),
 	DT_CLK(NULL, "timer6_fck", "timer6_fck"),
 	DT_CLK(NULL, "timer7_fck", "timer7_fck"),
 	DT_CLK(NULL, "usbotg_fck", "usbotg_fck"),
 	DT_CLK(NULL, "ieee5000_fck", "ieee5000_fck"),
 	DT_CLK(NULL, "wdt1_fck", "wdt1_fck"),
 	DT_CLK(NULL, "l4_rtc_gclk", "l4_rtc_gclk"),
 	DT_CLK(NULL, "l3_gclk", "l3_gclk"),
 	DT_CLK(NULL, "dpll_core_m4_div2_ck", "dpll_core_m4_div2_ck"),
 	DT_CLK(NULL, "l4hs_gclk", "l4hs_gclk"),
 	DT_CLK(NULL, "l3s_gclk", "l3s_gclk"),
 	DT_CLK(NULL, "l4fw_gclk", "l4fw_gclk"),
 	DT_CLK(NULL, "l4ls_gclk", "l4ls_gclk"),
 	DT_CLK(NULL, "clk_24mhz", "clk_24mhz"),
 	DT_CLK(NULL, "sysclk_div_ck", "sysclk_div_ck"),
 	DT_CLK(NULL, "cpsw_125mhz_gclk", "cpsw_125mhz_gclk"),
 	DT_CLK(NULL, "cpsw_cpts_rft_clk", "cpsw_cpts_rft_clk"),
 	DT_CLK(NULL, "gpio0_dbclk_mux_ck", "gpio0_dbclk_mux_ck"),
 	DT_CLK(NULL, "gpio0_dbclk", "gpio0_dbclk"),
 	DT_CLK(NULL, "gpio1_dbclk", "gpio1_dbclk"),
 	DT_CLK(NULL, "gpio2_dbclk", "gpio2_dbclk"),
 	DT_CLK(NULL, "gpio3_dbclk", "gpio3_dbclk"),
 	DT_CLK(NULL, "lcd_gclk", "lcd_gclk"),
 	DT_CLK(NULL, "mmc_clk", "mmc_clk"),
 	DT_CLK(NULL, "gfx_fclk_clksel_ck", "gfx_fclk_clksel_ck"),
 	DT_CLK(NULL, "gfx_fck_div_ck", "gfx_fck_div_ck"),
 	DT_CLK(NULL, "sysclkout_pre_ck", "sysclkout_pre_ck"),
 	DT_CLK(NULL, "clkout2_div_ck", "clkout2_div_ck"),
 	DT_CLK(NULL, "timer_32k_ck", "clkdiv32k_ick"),
 	DT_CLK(NULL, "timer_sys_ck", "sys_clkin_ck"),
 	DT_CLK(NULL, "dbg_sysclk_ck", "dbg_sysclk_ck"),
 	DT_CLK(NULL, "dbg_clka_ck", "dbg_clka_ck"),
 	DT_CLK(NULL, "stm_pmd_clock_mux_ck", "stm_pmd_clock_mux_ck"),
 	DT_CLK(NULL, "trace_pmd_clk_mux_ck", "trace_pmd_clk_mux_ck"),
 	DT_CLK(NULL, "stm_clk_div_ck", "stm_clk_div_ck"),
 	DT_CLK(NULL, "trace_clk_div_ck", "trace_clk_div_ck"),
 	DT_CLK(NULL, "clkout2_ck", "clkout2_ck"),
 	DT_CLK("48300200.ehrpwm", "tbclk", "ehrpwm0_tbclk"),
 	DT_CLK("48302200.ehrpwm", "tbclk", "ehrpwm1_tbclk"),
 	DT_CLK("48304200.ehrpwm", "tbclk", "ehrpwm2_tbclk"),
 	{ .node_name = NULL },
 };

 static const char *enable_init_clks[] = {
 	"dpll_ddr_m2_ck",
 	"dpll_mpu_m2_ck",
 	"l3_gclk",
 	"l4hs_gclk",
 	"l4fw_gclk",
 	"l4ls_gclk",
 	/* Required for external peripherals like, Audio codecs */
 	"clkout2_ck",
 };

 int __init am33xx_dt_clk_init(void)
 {
 	struct clk *clk1, *clk2;

 	ti_dt_clocks_register(am33xx_clks);

 	omap2_clk_disable_autoidle_all();

 	omap2_clk_enable_init_clocks(enable_init_clks,
 				     ARRAY_SIZE(enable_init_clks));

 	/* TRM ERRATA: Timer 3 & 6 default parent (TCLKIN) may not be always
 	 *    physically present, in such a case HWMOD enabling of
 	 *    clock would be failure with default parent. And timer
 	 *    probe thinks clock is already enabled, this leads to
 	 *    crash upon accessing timer 3 & 6 registers in probe.
 	 *    Fix by setting parent of both these timers to master
 	 *    oscillator clock.
 	 */

 	clk1 = clk_get_sys(NULL, "sys_clkin_ck");
 	clk2 = clk_get_sys(NULL, "timer3_fck");
 	clk_set_parent(clk2, clk1);

 	clk2 = clk_get_sys(NULL, "timer6_fck");
 	clk_set_parent(clk2, clk1);
 	/*
 	 * The On-Chip 32K RC Osc clock is not an accurate clock-source as per
 	 * the design/spec, so as a result, for example, timer which supposed
 	 * to get expired @60Sec, but will expire somewhere ~@40Sec, which is
 	 * not expected by any use-case, so change WDT1 clock source to PRCM
 	 * 32KHz clock.
 	 */
 	clk1 = clk_get_sys(NULL, "wdt1_fck");
 	clk2 = clk_get_sys(NULL, "clkdiv32k_ick");
 	clk_set_parent(clk1, clk2);

 	return 0;
 }
	/*
	* AM33XX Clock init
	*
	* Copyright (C) 2013 Texas Instruments, Inc
	* Tero Kristo (t-kristo@ti.com)
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/list.h>
	#include <linux/clk-provider.h>
	#include <linux/clk/ti.h>

	static struct ti_dt_clk am33xx_clks[] = {
	DT_CLK(NULL, "clk_32768_ck", "clk_32768_ck"),
	DT_CLK(NULL, "clk_rc32k_ck", "clk_rc32k_ck"),
	DT_CLK(NULL, "virt_19200000_ck", "virt_19200000_ck"),
	DT_CLK(NULL, "virt_24000000_ck", "virt_24000000_ck"),
	DT_CLK(NULL, "virt_25000000_ck", "virt_25000000_ck"),
	DT_CLK(NULL, "virt_26000000_ck", "virt_26000000_ck"),
	DT_CLK(NULL, "sys_clkin_ck", "sys_clkin_ck"),
	DT_CLK(NULL, "tclkin_ck", "tclkin_ck"),
	DT_CLK(NULL, "dpll_core_ck", "dpll_core_ck"),
	DT_CLK(NULL, "dpll_core_x2_ck", "dpll_core_x2_ck"),
	DT_CLK(NULL, "dpll_core_m4_ck", "dpll_core_m4_ck"),
	DT_CLK(NULL, "dpll_core_m5_ck", "dpll_core_m5_ck"),
	DT_CLK(NULL, "dpll_core_m6_ck", "dpll_core_m6_ck"),
	DT_CLK(NULL, "dpll_mpu_ck", "dpll_mpu_ck"),
	DT_CLK("cpu0", NULL, "dpll_mpu_ck"),
	DT_CLK(NULL, "dpll_mpu_m2_ck", "dpll_mpu_m2_ck"),
	DT_CLK(NULL, "dpll_ddr_ck", "dpll_ddr_ck"),
	DT_CLK(NULL, "dpll_ddr_m2_ck", "dpll_ddr_m2_ck"),
	DT_CLK(NULL, "dpll_ddr_m2_div2_ck", "dpll_ddr_m2_div2_ck"),
	DT_CLK(NULL, "dpll_disp_ck", "dpll_disp_ck"),
	DT_CLK(NULL, "dpll_disp_m2_ck", "dpll_disp_m2_ck"),
	DT_CLK(NULL, "dpll_per_ck", "dpll_per_ck"),
	DT_CLK(NULL, "dpll_per_m2_ck", "dpll_per_m2_ck"),
	DT_CLK(NULL, "dpll_per_m2_div4_wkupdm_ck", "dpll_per_m2_div4_wkupdm_ck"),
	DT_CLK(NULL, "dpll_per_m2_div4_ck", "dpll_per_m2_div4_ck"),
	DT_CLK(NULL, "adc_tsc_fck", "adc_tsc_fck"),
	DT_CLK(NULL, "cefuse_fck", "cefuse_fck"),
	DT_CLK(NULL, "clkdiv32k_ck", "clkdiv32k_ck"),
	DT_CLK(NULL, "clkdiv32k_ick", "clkdiv32k_ick"),
	DT_CLK(NULL, "dcan0_fck", "dcan0_fck"),
	DT_CLK("481cc000.d_can", NULL, "dcan0_fck"),
	DT_CLK(NULL, "dcan1_fck", "dcan1_fck"),
	DT_CLK("481d0000.d_can", NULL, "dcan1_fck"),
	DT_CLK(NULL, "pruss_ocp_gclk", "pruss_ocp_gclk"),
	DT_CLK(NULL, "mcasp0_fck", "mcasp0_fck"),
	DT_CLK(NULL, "mcasp1_fck", "mcasp1_fck"),
	DT_CLK(NULL, "mmu_fck", "mmu_fck"),
	DT_CLK(NULL, "smartreflex0_fck", "smartreflex0_fck"),
	DT_CLK(NULL, "smartreflex1_fck", "smartreflex1_fck"),
	DT_CLK(NULL, "sha0_fck", "sha0_fck"),
	DT_CLK(NULL, "aes0_fck", "aes0_fck"),
	DT_CLK(NULL, "rng_fck", "rng_fck"),
	DT_CLK(NULL, "timer1_fck", "timer1_fck"),
	DT_CLK(NULL, "timer2_fck", "timer2_fck"),
	DT_CLK(NULL, "timer3_fck", "timer3_fck"),
	DT_CLK(NULL, "timer4_fck", "timer4_fck"),
	DT_CLK(NULL, "timer5_fck", "timer5_fck"),
	DT_CLK(NULL, "timer6_fck", "timer6_fck"),
	DT_CLK(NULL, "timer7_fck", "timer7_fck"),
	DT_CLK(NULL, "usbotg_fck", "usbotg_fck"),
	DT_CLK(NULL, "ieee5000_fck", "ieee5000_fck"),
	DT_CLK(NULL, "wdt1_fck", "wdt1_fck"),
	DT_CLK(NULL, "l4_rtc_gclk", "l4_rtc_gclk"),
	DT_CLK(NULL, "l3_gclk", "l3_gclk"),
	DT_CLK(NULL, "dpll_core_m4_div2_ck", "dpll_core_m4_div2_ck"),
	DT_CLK(NULL, "l4hs_gclk", "l4hs_gclk"),
	DT_CLK(NULL, "l3s_gclk", "l3s_gclk"),
	DT_CLK(NULL, "l4fw_gclk", "l4fw_gclk"),
	DT_CLK(NULL, "l4ls_gclk", "l4ls_gclk"),
	DT_CLK(NULL, "clk_24mhz", "clk_24mhz"),
	DT_CLK(NULL, "sysclk_div_ck", "sysclk_div_ck"),
	DT_CLK(NULL, "cpsw_125mhz_gclk", "cpsw_125mhz_gclk"),
	DT_CLK(NULL, "cpsw_cpts_rft_clk", "cpsw_cpts_rft_clk"),
	DT_CLK(NULL, "gpio0_dbclk_mux_ck", "gpio0_dbclk_mux_ck"),
	DT_CLK(NULL, "gpio0_dbclk", "gpio0_dbclk"),
	DT_CLK(NULL, "gpio1_dbclk", "gpio1_dbclk"),
	DT_CLK(NULL, "gpio2_dbclk", "gpio2_dbclk"),
	DT_CLK(NULL, "gpio3_dbclk", "gpio3_dbclk"),
	DT_CLK(NULL, "lcd_gclk", "lcd_gclk"),
	DT_CLK(NULL, "mmc_clk", "mmc_clk"),
	DT_CLK(NULL, "gfx_fclk_clksel_ck", "gfx_fclk_clksel_ck"),
	DT_CLK(NULL, "gfx_fck_div_ck", "gfx_fck_div_ck"),
	DT_CLK(NULL, "sysclkout_pre_ck", "sysclkout_pre_ck"),
	DT_CLK(NULL, "clkout2_div_ck", "clkout2_div_ck"),
	DT_CLK(NULL, "timer_32k_ck", "clkdiv32k_ick"),
	DT_CLK(NULL, "timer_sys_ck", "sys_clkin_ck"),
	DT_CLK(NULL, "dbg_sysclk_ck", "dbg_sysclk_ck"),
	DT_CLK(NULL, "dbg_clka_ck", "dbg_clka_ck"),
	DT_CLK(NULL, "stm_pmd_clock_mux_ck", "stm_pmd_clock_mux_ck"),
	DT_CLK(NULL, "trace_pmd_clk_mux_ck", "trace_pmd_clk_mux_ck"),
	DT_CLK(NULL, "stm_clk_div_ck", "stm_clk_div_ck"),
	DT_CLK(NULL, "trace_clk_div_ck", "trace_clk_div_ck"),
	DT_CLK(NULL, "clkout2_ck", "clkout2_ck"),
	DT_CLK("48300200.ehrpwm", "tbclk", "ehrpwm0_tbclk"),
	DT_CLK("48302200.ehrpwm", "tbclk", "ehrpwm1_tbclk"),
	DT_CLK("48304200.ehrpwm", "tbclk", "ehrpwm2_tbclk"),
	{ .node_name = NULL },
	};

	static const char *enable_init_clks[] = {
	"dpll_ddr_m2_ck",
	"dpll_mpu_m2_ck",
	"l3_gclk",
	"l4hs_gclk",
	"l4fw_gclk",
	"l4ls_gclk",
	/* Required for external peripherals like, Audio codecs */
	"clkout2_ck",
	};

	int __init am33xx_dt_clk_init(void)
	{
	struct clk clk1, clk2;

	ti_dt_clocks_register(am33xx_clks);

	omap2_clk_disable_autoidle_all();

	omap2_clk_enable_init_clocks(enable_init_clks,
	ARRAY_SIZE(enable_init_clks));

	/* TRM ERRATA: Timer 3 & 6 default parent (TCLKIN) may not be always
	* physically present, in such a case HWMOD enabling of
	* clock would be failure with default parent. And timer
	* probe thinks clock is already enabled, this leads to
	* crash upon accessing timer 3 & 6 registers in probe.
	* Fix by setting parent of both these timers to master
	* oscillator clock.
	*/

	clk1 = clk_get_sys(NULL, "sys_clkin_ck");
	clk2 = clk_get_sys(NULL, "timer3_fck");
	clk_set_parent(clk2, clk1);

	clk2 = clk_get_sys(NULL, "timer6_fck");
	clk_set_parent(clk2, clk1);
	/*
	* The On-Chip 32K RC Osc clock is not an accurate clock-source as per
	* the design/spec, so as a result, for example, timer which supposed
	* to get expired @60Sec, but will expire somewhere ~@40Sec, which is
	* not expected by any use-case, so change WDT1 clock source to PRCM
	* 32KHz clock.
	*/
	clk1 = clk_get_sys(NULL, "wdt1_fck");
	clk2 = clk_get_sys(NULL, "clkdiv32k_ick");
	clk_set_parent(clk1, clk2);

	return 0;
	}