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c73b9099da
OMAP1 still uses its own implementation of standard clock API defined in include/linux/clk.h. Internals of that implementation are not visible outside OMAP1 directory. As a consequence, device drivers are not able to register clocks potentially provided by peripheral devices. Drop OMAP1 implementation of the clock API and enable common clock framework. Modify the remaining low level code to be compatible with clock provider API and register the clocks with CCF. Move initialisation of clocks to omap1_timer_init() to avoid memory allocation issues at early setup phase from where omap1_init_early() is called. Register the clocks after initialization of clock I/O registers, local clock pointers used by OMAP1 clock ops, and local .rate fields of clocks with no local implementation of .recalc ops, so CCF structures are populated with correct data during clock registration. Instead of enabling some of the registered clocks, flag them for CCF as critical. Introduce .is_enabled op using code that verifies hardware status of clock enablement, split out from implementation of .disable_unused op, so the latter is actually called by CCF for not requested but hardware enabled clocks. Add .round_rate ops where missing so .set_rate ops are called by CCF as expected. Since CCF allows parallel execution of .enable/.disable and .set_rate ops, protect registers shared among those groups of ops from concurrent access with spinlocks. Drop local debugfs support in favor of that provided by CCF. v2: flag tc2_ck as CLK_IS_CRITICAL (Aaro) v3: rebase on top of soc/omap1-multiplatform-5.18, - drop no longer needed includes from arch/arm/mach-omap1/io.c Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
195 lines
6.6 KiB
C
195 lines
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mach-omap1/clock.h
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*
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* Copyright (C) 2004 - 2005, 2009 Nokia corporation
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* Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
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* Based on clocks.h by Tony Lindgren, Gordon McNutt and RidgeRun, Inc
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*/
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#ifndef __ARCH_ARM_MACH_OMAP1_CLOCK_H
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#define __ARCH_ARM_MACH_OMAP1_CLOCK_H
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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struct module;
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struct omap1_clk;
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struct omap_clk {
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u16 cpu;
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struct clk_lookup lk;
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};
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#define CLK(dev, con, ck, cp) \
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{ \
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.cpu = cp, \
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.lk = { \
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.dev_id = dev, \
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.con_id = con, \
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.clk_hw = ck, \
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}, \
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}
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/* Platform flags for the clkdev-OMAP integration code */
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#define CK_310 (1 << 0)
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#define CK_7XX (1 << 1) /* 7xx, 850 */
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#define CK_1510 (1 << 2)
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#define CK_16XX (1 << 3) /* 16xx, 17xx, 5912 */
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#define CK_1710 (1 << 4) /* 1710 extra for rate selection */
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/**
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* struct clkops - some clock function pointers
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* @enable: fn ptr that enables the current clock in hardware
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* @disable: fn ptr that enables the current clock in hardware
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* @allow_idle: fn ptr that enables autoidle for the current clock in hardware
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*/
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struct clkops {
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int (*enable)(struct omap1_clk *clk);
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void (*disable)(struct omap1_clk *clk);
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};
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/*
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* struct clk.flags possibilities
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*
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* XXX document the rest of the clock flags here
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*/
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#define ENABLE_REG_32BIT (1 << 0) /* Use 32-bit access */
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#define CLOCK_IDLE_CONTROL (1 << 1)
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#define CLOCK_NO_IDLE_PARENT (1 << 2)
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/**
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* struct omap1_clk - OMAP1 struct clk
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* @hw: struct clk_hw for common clock framework integration
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* @ops: struct clkops * for this clock
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* @rate: current clock rate
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* @enable_reg: register to write to enable the clock (see @enable_bit)
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* @recalc: fn ptr that returns the clock's current rate
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* @set_rate: fn ptr that can change the clock's current rate
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* @round_rate: fn ptr that can round the clock's current rate
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* @init: fn ptr to do clock-specific initialization
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* @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg)
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* @fixed_div: when > 0, this clock's rate is its parent's rate / @fixed_div
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* @flags: see "struct clk.flags possibilities" above
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* @rate_offset: bitshift for rate selection bitfield (OMAP1 only)
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*/
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struct omap1_clk {
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struct clk_hw hw;
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const struct clkops *ops;
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unsigned long rate;
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void __iomem *enable_reg;
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unsigned long (*recalc)(struct omap1_clk *clk, unsigned long rate);
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int (*set_rate)(struct omap1_clk *clk, unsigned long rate,
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unsigned long p_rate);
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long (*round_rate)(struct omap1_clk *clk, unsigned long rate,
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unsigned long *p_rate);
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int (*init)(struct omap1_clk *clk);
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u8 enable_bit;
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u8 fixed_div;
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u8 flags;
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u8 rate_offset;
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};
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#define to_omap1_clk(_hw) container_of(_hw, struct omap1_clk, hw)
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void propagate_rate(struct omap1_clk *clk);
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unsigned long followparent_recalc(struct omap1_clk *clk, unsigned long p_rate);
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unsigned long omap_fixed_divisor_recalc(struct omap1_clk *clk, unsigned long p_rate);
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extern struct omap1_clk dummy_ck;
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int omap1_clk_init(void);
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void omap1_clk_late_init(void);
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unsigned long omap1_ckctl_recalc(struct omap1_clk *clk, unsigned long p_rate);
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long omap1_round_sossi_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate);
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int omap1_set_sossi_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate);
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unsigned long omap1_sossi_recalc(struct omap1_clk *clk, unsigned long p_rate);
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unsigned long omap1_ckctl_recalc_dsp_domain(struct omap1_clk *clk, unsigned long p_rate);
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int omap1_clk_set_rate_dsp_domain(struct omap1_clk *clk, unsigned long rate,
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unsigned long p_rate);
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long omap1_round_uart_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate);
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int omap1_set_uart_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate);
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unsigned long omap1_uart_recalc(struct omap1_clk *clk, unsigned long p_rate);
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int omap1_set_ext_clk_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate);
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long omap1_round_ext_clk_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate);
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int omap1_init_ext_clk(struct omap1_clk *clk);
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int omap1_select_table_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate);
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long omap1_round_to_table_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate);
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int omap1_clk_set_rate_ckctl_arm(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate);
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long omap1_clk_round_rate_ckctl_arm(struct omap1_clk *clk, unsigned long rate,
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unsigned long *p_rate);
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struct uart_clk {
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struct omap1_clk clk;
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unsigned long sysc_addr;
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};
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/* Provide a method for preventing idling some ARM IDLECT clocks */
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struct arm_idlect1_clk {
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struct omap1_clk clk;
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unsigned long no_idle_count;
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__u8 idlect_shift;
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};
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/* ARM_CKCTL bit shifts */
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#define CKCTL_PERDIV_OFFSET 0
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#define CKCTL_LCDDIV_OFFSET 2
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#define CKCTL_ARMDIV_OFFSET 4
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#define CKCTL_DSPDIV_OFFSET 6
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#define CKCTL_TCDIV_OFFSET 8
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#define CKCTL_DSPMMUDIV_OFFSET 10
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/*#define ARM_TIMXO 12*/
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#define EN_DSPCK 13
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/*#define ARM_INTHCK_SEL 14*/ /* Divide-by-2 for mpu inth_ck */
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/* DSP_CKCTL bit shifts */
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#define CKCTL_DSPPERDIV_OFFSET 0
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/* ARM_IDLECT2 bit shifts */
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#define EN_WDTCK 0
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#define EN_XORPCK 1
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#define EN_PERCK 2
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#define EN_LCDCK 3
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#define EN_LBCK 4 /* Not on 1610/1710 */
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/*#define EN_HSABCK 5*/
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#define EN_APICK 6
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#define EN_TIMCK 7
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#define DMACK_REQ 8
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#define EN_GPIOCK 9 /* Not on 1610/1710 */
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/*#define EN_LBFREECK 10*/
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#define EN_CKOUT_ARM 11
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/* ARM_IDLECT3 bit shifts */
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#define EN_OCPI_CK 0
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#define EN_TC1_CK 2
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#define EN_TC2_CK 4
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/* DSP_IDLECT2 bit shifts (0,1,2 are same as for ARM_IDLECT2) */
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#define EN_DSPTIMCK 5
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/* Various register defines for clock controls scattered around OMAP chip */
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#define SDW_MCLK_INV_BIT 2 /* In ULPD_CLKC_CTRL */
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#define USB_MCLK_EN_BIT 4 /* In ULPD_CLKC_CTRL */
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#define USB_HOST_HHC_UHOST_EN 9 /* In MOD_CONF_CTRL_0 */
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#define SWD_ULPD_PLL_CLK_REQ 1 /* In SWD_CLK_DIV_CTRL_SEL */
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#define COM_ULPD_PLL_CLK_REQ 1 /* In COM_CLK_DIV_CTRL_SEL */
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#define SWD_CLK_DIV_CTRL_SEL 0xfffe0874
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#define COM_CLK_DIV_CTRL_SEL 0xfffe0878
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#define SOFT_REQ_REG 0xfffe0834
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#define SOFT_REQ_REG2 0xfffe0880
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extern __u32 arm_idlect1_mask;
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extern struct omap1_clk *api_ck_p, *ck_dpll1_p, *ck_ref_p;
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extern const struct clkops clkops_dspck;
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extern const struct clkops clkops_uart_16xx;
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extern const struct clkops clkops_generic;
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/* used for passing SoC type to omap1_{select,round_to}_table_rate() */
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extern u32 cpu_mask;
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extern const struct clk_ops omap1_clk_null_ops;
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extern const struct clk_ops omap1_clk_gate_ops;
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extern const struct clk_ops omap1_clk_rate_ops;
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extern const struct clk_ops omap1_clk_full_ops;
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#endif
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