// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP2+ common Clock Management (CM) IP block functions
*
* Copyright (C) 2012 Texas Instruments, Inc.
* Paul Walmsley
*
* XXX This code should eventually be moved to a CM driver.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "cm2xxx.h"
#include "cm3xxx.h"
#include "cm33xx.h"
#include "cm44xx.h"
#include "clock.h"
/*
* cm_ll_data: function pointers to SoC-specific implementations of
* common CM functions
*/
static struct cm_ll_data null_cm_ll_data;
static const struct cm_ll_data *cm_ll_data = &null_cm_ll_data;
/* cm_base: base virtual address of the CM IP block */
struct omap_domain_base cm_base;
/* cm2_base: base virtual address of the CM2 IP block (OMAP44xx only) */
struct omap_domain_base cm2_base;
#define CM_NO_CLOCKS 0x1
#define CM_SINGLE_INSTANCE 0x2
/**
* cm_split_idlest_reg - split CM_IDLEST reg addr into its components
* @idlest_reg: CM_IDLEST* virtual address
* @prcm_inst: pointer to an s16 to return the PRCM instance offset
* @idlest_reg_id: pointer to a u8 to return the CM_IDLESTx register ID
*
* Given an absolute CM_IDLEST register address @idlest_reg, passes
* the PRCM instance offset and IDLEST register ID back to the caller
* via the @prcm_inst and @idlest_reg_id. Returns -EINVAL upon error,
* or 0 upon success. XXX This function is only needed until absolute
* register addresses are removed from the OMAP struct clk records.
*/
int cm_split_idlest_reg(struct clk_omap_reg *idlest_reg, s16 *prcm_inst,
u8 *idlest_reg_id)
{
int ret;
if (!cm_ll_data->split_idlest_reg) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return -EINVAL;
}
ret = cm_ll_data->split_idlest_reg(idlest_reg, prcm_inst,
idlest_reg_id);
*prcm_inst -= cm_base.offset;
return ret;
}
/**
* omap_cm_wait_module_ready - wait for a module to leave idle or standby
* @part: PRCM partition
* @prcm_mod: PRCM module offset
* @idlest_reg: CM_IDLESTx register
* @idlest_shift: shift of the bit in the CM_IDLEST* register to check
*
* Wait for the PRCM to indicate that the module identified by
* (@prcm_mod, @idlest_id, @idlest_shift) is clocked. Return 0 upon
* success, -EBUSY if the module doesn't enable in time, or -EINVAL if
* no per-SoC wait_module_ready() function pointer has been registered
* or if the idlest register is unknown on the SoC.
*/
int omap_cm_wait_module_ready(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift)
{
if (!cm_ll_data->wait_module_ready) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return -EINVAL;
}
return cm_ll_data->wait_module_ready(part, prcm_mod, idlest_reg,
idlest_shift);
}
/**
* omap_cm_wait_module_idle - wait for a module to enter idle or standby
* @part: PRCM partition
* @prcm_mod: PRCM module offset
* @idlest_reg: CM_IDLESTx register
* @idlest_shift: shift of the bit in the CM_IDLEST* register to check
*
* Wait for the PRCM to indicate that the module identified by
* (@prcm_mod, @idlest_id, @idlest_shift) is no longer clocked. Return
* 0 upon success, -EBUSY if the module doesn't enable in time, or
* -EINVAL if no per-SoC wait_module_idle() function pointer has been
* registered or if the idlest register is unknown on the SoC.
*/
int omap_cm_wait_module_idle(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift)
{
if (!cm_ll_data->wait_module_idle) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return -EINVAL;
}
return cm_ll_data->wait_module_idle(part, prcm_mod, idlest_reg,
idlest_shift);
}
/**
* omap_cm_module_enable - enable a module
* @mode: target mode for the module
* @part: PRCM partition
* @inst: PRCM instance
* @clkctrl_offs: CM_CLKCTRL register offset for the module
*
* Enables clocks for a module identified by (@part, @inst, @clkctrl_offs)
* making its IO space accessible. Return 0 upon success, -EINVAL if no
* per-SoC module_enable() function pointer has been registered.
*/
int omap_cm_module_enable(u8 mode, u8 part, u16 inst, u16 clkctrl_offs)
{
if (!cm_ll_data->module_enable) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return -EINVAL;
}
cm_ll_data->module_enable(mode, part, inst, clkctrl_offs);
return 0;
}
/**
* omap_cm_module_disable - disable a module
* @part: PRCM partition
* @inst: PRCM instance
* @clkctrl_offs: CM_CLKCTRL register offset for the module
*
* Disables clocks for a module identified by (@part, @inst, @clkctrl_offs)
* makings its IO space inaccessible. Return 0 upon success, -EINVAL if
* no per-SoC module_disable() function pointer has been registered.
*/
int omap_cm_module_disable(u8 part, u16 inst, u16 clkctrl_offs)
{
if (!cm_ll_data->module_disable) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return -EINVAL;
}
cm_ll_data->module_disable(part, inst, clkctrl_offs);
return 0;
}
u32 omap_cm_xlate_clkctrl(u8 part, u16 inst, u16 clkctrl_offs)
{
if (!cm_ll_data->xlate_clkctrl) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return 0;
}
return cm_ll_data->xlate_clkctrl(part, inst, clkctrl_offs);
}
/**
* cm_register - register per-SoC low-level data with the CM
* @cld: low-level per-SoC OMAP CM data & function pointers to register
*
* Register per-SoC low-level OMAP CM data and function pointers with
* the OMAP CM common interface. The caller must keep the data
* pointed to by @cld valid until it calls cm_unregister() and
* it returns successfully. Returns 0 upon success, -EINVAL if @cld
* is NULL, or -EEXIST if cm_register() has already been called
* without an intervening cm_unregister().
*/
int cm_register(const struct cm_ll_data *cld)
{
if (!cld)
return -EINVAL;
if (cm_ll_data != &null_cm_ll_data)
return -EEXIST;
cm_ll_data = cld;
return 0;
}
/**
* cm_unregister - unregister per-SoC low-level data & function pointers
* @cld: low-level per-SoC OMAP CM data & function pointers to unregister
*
* Unregister per-SoC low-level OMAP CM data and function pointers
* that were previously registered with cm_register(). The
* caller may not destroy any of the data pointed to by @cld until
* this function returns successfully. Returns 0 upon success, or
* -EINVAL if @cld is NULL or if @cld does not match the struct
* cm_ll_data * previously registered by cm_register().
*/
int cm_unregister(const struct cm_ll_data *cld)
{
if (!cld || cm_ll_data != cld)
return -EINVAL;
cm_ll_data = &null_cm_ll_data;
return 0;
}
#if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
defined(CONFIG_SOC_DRA7XX)
static struct omap_prcm_init_data cm_data __initdata = {
.index = TI_CLKM_CM,
.init = omap4_cm_init,
};
static struct omap_prcm_init_data cm2_data __initdata = {
.index = TI_CLKM_CM2,
.init = omap4_cm_init,
};
#endif
#ifdef CONFIG_ARCH_OMAP2
static struct omap_prcm_init_data omap2_prcm_data __initdata = {
.index = TI_CLKM_CM,
.init = omap2xxx_cm_init,
.flags = CM_NO_CLOCKS | CM_SINGLE_INSTANCE,
};
#endif
#ifdef CONFIG_ARCH_OMAP3
static struct omap_prcm_init_data omap3_cm_data __initdata = {
.index = TI_CLKM_CM,
.init = omap3xxx_cm_init,
.flags = CM_SINGLE_INSTANCE,
/*
* IVA2 offset is a negative value, must offset the cm_base address
* by this to get it to positive side on the iomap
*/
.offset = -OMAP3430_IVA2_MOD,
};
#endif
#if defined(CONFIG_SOC_AM33XX) || defined(CONFIG_SOC_TI81XX)
static struct omap_prcm_init_data am3_prcm_data __initdata = {
.index = TI_CLKM_CM,
.flags = CM_NO_CLOCKS | CM_SINGLE_INSTANCE,
.init = am33xx_cm_init,
};
#endif
#ifdef CONFIG_SOC_AM43XX
static struct omap_prcm_init_data am4_prcm_data __initdata = {
.index = TI_CLKM_CM,
.flags = CM_NO_CLOCKS | CM_SINGLE_INSTANCE,
.init = omap4_cm_init,
};
#endif
static const struct of_device_id omap_cm_dt_match_table[] __initconst = {
#ifdef CONFIG_ARCH_OMAP2
{ .compatible = "ti,omap2-prcm", .data = &omap2_prcm_data },
#endif
#ifdef CONFIG_ARCH_OMAP3
{ .compatible = "ti,omap3-cm", .data = &omap3_cm_data },
#endif
#ifdef CONFIG_ARCH_OMAP4
{ .compatible = "ti,omap4-cm1", .data = &cm_data },
{ .compatible = "ti,omap4-cm2", .data = &cm2_data },
#endif
#ifdef CONFIG_SOC_OMAP5
{ .compatible = "ti,omap5-cm-core-aon", .data = &cm_data },
{ .compatible = "ti,omap5-cm-core", .data = &cm2_data },
#endif
#ifdef CONFIG_SOC_DRA7XX
{ .compatible = "ti,dra7-cm-core-aon", .data = &cm_data },
{ .compatible = "ti,dra7-cm-core", .data = &cm2_data },
#endif
#ifdef CONFIG_SOC_AM33XX
{ .compatible = "ti,am3-prcm", .data = &am3_prcm_data },
#endif
#ifdef CONFIG_SOC_AM43XX
{ .compatible = "ti,am4-prcm", .data = &am4_prcm_data },
#endif
#ifdef CONFIG_SOC_TI81XX
{ .compatible = "ti,dm814-prcm", .data = &am3_prcm_data },
{ .compatible = "ti,dm816-prcm", .data = &am3_prcm_data },
#endif
{ }
};
/**
* omap2_cm_base_init - initialize iomappings for the CM drivers
*
* Detects and initializes the iomappings for the CM driver, based
* on the DT data. Returns 0 in success, negative error value
* otherwise.
*/
int __init omap2_cm_base_init(void)
{
struct device_node *np;
const struct of_device_id *match;
struct omap_prcm_init_data *data;
struct resource res;
int ret;
struct omap_domain_base *mem = NULL;
for_each_matching_node_and_match(np, omap_cm_dt_match_table, &match) {
data = (struct omap_prcm_init_data *)match->data;
ret = of_address_to_resource(np, 0, &res);
if (ret) {
of_node_put(np);
return ret;
}
if (data->index == TI_CLKM_CM)
mem = &cm_base;
if (data->index == TI_CLKM_CM2)
mem = &cm2_base;
data->mem = ioremap(res.start, resource_size(&res));
if (mem) {
mem->pa = res.start + data->offset;
mem->va = data->mem + data->offset;
mem->offset = data->offset;
}
data->np = np;
if (data->init && (data->flags & CM_SINGLE_INSTANCE ||
(cm_base.va && cm2_base.va)))
data->init(data);
}
return 0;
}
/**
* omap_cm_init - low level init for the CM drivers
*
* Initializes the low level clock infrastructure for CM drivers.
* Returns 0 in success, negative error value in failure.
*/
int __init omap_cm_init(void)
{
struct device_node *np;
const struct of_device_id *match;
const struct omap_prcm_init_data *data;
int ret;
for_each_matching_node_and_match(np, omap_cm_dt_match_table, &match) {
data = match->data;
if (data->flags & CM_NO_CLOCKS)
continue;
ret = omap2_clk_provider_init(np, data->index, NULL, data->mem);
if (ret) {
of_node_put(np);
return ret;
}
}
return 0;
}
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