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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Copyright (C) 2018 SiFive, Inc.
* Wesley Terpstra
* Paul Walmsley
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* The FU540 PRCI implements clock and reset control for the SiFive
* FU540-C000 chip. This driver assumes that it has sole control
* over all PRCI resources.
*
* This driver is based on the PRCI driver written by Wesley Terpstra.
*
* Refer, commit 999529edf517ed75b56659d456d221b2ee56bb60 of:
* https://github.com/riscv/riscv-linux
*
* References:
* - SiFive FU540-C000 manual v1p0, Chapter 7 "Clocking and Reset"
*/
#include <asm/io.h>
#include <clk-uclass.h>
#include <clk.h>
#include <common.h>
#include <div64.h>
#include <dm.h>
#include <errno.h>
#include <linux/math64.h>
#include <dt-bindings/clk/sifive-fu540-prci.h>
#include "analogbits-wrpll-cln28hpc.h"
/*
* EXPECTED_CLK_PARENT_COUNT: how many parent clocks this driver expects:
* hfclk and rtcclk
*/
#define EXPECTED_CLK_PARENT_COUNT 2
/*
* Register offsets and bitmasks
*/
/* COREPLLCFG0 */
#define PRCI_COREPLLCFG0_OFFSET 0x4
#define PRCI_COREPLLCFG0_DIVR_SHIFT 0
#define PRCI_COREPLLCFG0_DIVR_MASK (0x3f << PRCI_COREPLLCFG0_DIVR_SHIFT)
#define PRCI_COREPLLCFG0_DIVF_SHIFT 6
#define PRCI_COREPLLCFG0_DIVF_MASK (0x1ff << PRCI_COREPLLCFG0_DIVF_SHIFT)
#define PRCI_COREPLLCFG0_DIVQ_SHIFT 15
#define PRCI_COREPLLCFG0_DIVQ_MASK (0x7 << PRCI_COREPLLCFG0_DIVQ_SHIFT)
#define PRCI_COREPLLCFG0_RANGE_SHIFT 18
#define PRCI_COREPLLCFG0_RANGE_MASK (0x7 << PRCI_COREPLLCFG0_RANGE_SHIFT)
#define PRCI_COREPLLCFG0_BYPASS_SHIFT 24
#define PRCI_COREPLLCFG0_BYPASS_MASK (0x1 << PRCI_COREPLLCFG0_BYPASS_SHIFT)
#define PRCI_COREPLLCFG0_FSE_SHIFT 25
#define PRCI_COREPLLCFG0_FSE_MASK (0x1 << PRCI_COREPLLCFG0_FSE_SHIFT)
#define PRCI_COREPLLCFG0_LOCK_SHIFT 31
#define PRCI_COREPLLCFG0_LOCK_MASK (0x1 << PRCI_COREPLLCFG0_LOCK_SHIFT)
/* DDRPLLCFG0 */
#define PRCI_DDRPLLCFG0_OFFSET 0xc
#define PRCI_DDRPLLCFG0_DIVR_SHIFT 0
#define PRCI_DDRPLLCFG0_DIVR_MASK (0x3f << PRCI_DDRPLLCFG0_DIVR_SHIFT)
#define PRCI_DDRPLLCFG0_DIVF_SHIFT 6
#define PRCI_DDRPLLCFG0_DIVF_MASK (0x1ff << PRCI_DDRPLLCFG0_DIVF_SHIFT)
#define PRCI_DDRPLLCFG0_DIVQ_SHIFT 15
#define PRCI_DDRPLLCFG0_DIVQ_MASK (0x7 << PRCI_DDRPLLCFG0_DIVQ_SHIFT)
#define PRCI_DDRPLLCFG0_RANGE_SHIFT 18
#define PRCI_DDRPLLCFG0_RANGE_MASK (0x7 << PRCI_DDRPLLCFG0_RANGE_SHIFT)
#define PRCI_DDRPLLCFG0_BYPASS_SHIFT 24
#define PRCI_DDRPLLCFG0_BYPASS_MASK (0x1 << PRCI_DDRPLLCFG0_BYPASS_SHIFT)
#define PRCI_DDRPLLCFG0_FSE_SHIFT 25
#define PRCI_DDRPLLCFG0_FSE_MASK (0x1 << PRCI_DDRPLLCFG0_FSE_SHIFT)
#define PRCI_DDRPLLCFG0_LOCK_SHIFT 31
#define PRCI_DDRPLLCFG0_LOCK_MASK (0x1 << PRCI_DDRPLLCFG0_LOCK_SHIFT)
/* DDRPLLCFG1 */
#define PRCI_DDRPLLCFG1_OFFSET 0x10
#define PRCI_DDRPLLCFG1_CKE_SHIFT 24
#define PRCI_DDRPLLCFG1_CKE_MASK (0x1 << PRCI_DDRPLLCFG1_CKE_SHIFT)
/* GEMGXLPLLCFG0 */
#define PRCI_GEMGXLPLLCFG0_OFFSET 0x1c
#define PRCI_GEMGXLPLLCFG0_DIVR_SHIFT 0
#define PRCI_GEMGXLPLLCFG0_DIVR_MASK \
(0x3f << PRCI_GEMGXLPLLCFG0_DIVR_SHIFT)
#define PRCI_GEMGXLPLLCFG0_DIVF_SHIFT 6
#define PRCI_GEMGXLPLLCFG0_DIVF_MASK \
(0x1ff << PRCI_GEMGXLPLLCFG0_DIVF_SHIFT)
#define PRCI_GEMGXLPLLCFG0_DIVQ_SHIFT 15
#define PRCI_GEMGXLPLLCFG0_DIVQ_MASK (0x7 << PRCI_GEMGXLPLLCFG0_DIVQ_SHIFT)
#define PRCI_GEMGXLPLLCFG0_RANGE_SHIFT 18
#define PRCI_GEMGXLPLLCFG0_RANGE_MASK \
(0x7 << PRCI_GEMGXLPLLCFG0_RANGE_SHIFT)
#define PRCI_GEMGXLPLLCFG0_BYPASS_SHIFT 24
#define PRCI_GEMGXLPLLCFG0_BYPASS_MASK \
(0x1 << PRCI_GEMGXLPLLCFG0_BYPASS_SHIFT)
#define PRCI_GEMGXLPLLCFG0_FSE_SHIFT 25
#define PRCI_GEMGXLPLLCFG0_FSE_MASK \
(0x1 << PRCI_GEMGXLPLLCFG0_FSE_SHIFT)
#define PRCI_GEMGXLPLLCFG0_LOCK_SHIFT 31
#define PRCI_GEMGXLPLLCFG0_LOCK_MASK (0x1 << PRCI_GEMGXLPLLCFG0_LOCK_SHIFT)
/* GEMGXLPLLCFG1 */
#define PRCI_GEMGXLPLLCFG1_OFFSET 0x20
#define PRCI_GEMGXLPLLCFG1_CKE_SHIFT 24
#define PRCI_GEMGXLPLLCFG1_CKE_MASK (0x1 << PRCI_GEMGXLPLLCFG1_CKE_SHIFT)
/* CORECLKSEL */
#define PRCI_CORECLKSEL_OFFSET 0x24
#define PRCI_CORECLKSEL_CORECLKSEL_SHIFT 0
#define PRCI_CORECLKSEL_CORECLKSEL_MASK \
(0x1 << PRCI_CORECLKSEL_CORECLKSEL_SHIFT)
/* DEVICESRESETREG */
#define PRCI_DEVICESRESETREG_OFFSET 0x28
#define PRCI_DEVICESRESETREG_DDR_CTRL_RST_N_SHIFT 0
#define PRCI_DEVICESRESETREG_DDR_CTRL_RST_N_MASK \
(0x1 << PRCI_DEVICESRESETREG_DDR_CTRL_RST_N_SHIFT)
#define PRCI_DEVICESRESETREG_DDR_AXI_RST_N_SHIFT 1
#define PRCI_DEVICESRESETREG_DDR_AXI_RST_N_MASK \
(0x1 << PRCI_DEVICESRESETREG_DDR_AXI_RST_N_SHIFT)
#define PRCI_DEVICESRESETREG_DDR_AHB_RST_N_SHIFT 2
#define PRCI_DEVICESRESETREG_DDR_AHB_RST_N_MASK \
(0x1 << PRCI_DEVICESRESETREG_DDR_AHB_RST_N_SHIFT)
#define PRCI_DEVICESRESETREG_DDR_PHY_RST_N_SHIFT 3
#define PRCI_DEVICESRESETREG_DDR_PHY_RST_N_MASK \
(0x1 << PRCI_DEVICESRESETREG_DDR_PHY_RST_N_SHIFT)
#define PRCI_DEVICESRESETREG_GEMGXL_RST_N_SHIFT 5
#define PRCI_DEVICESRESETREG_GEMGXL_RST_N_MASK \
(0x1 << PRCI_DEVICESRESETREG_GEMGXL_RST_N_SHIFT)
/* CLKMUXSTATUSREG */
#define PRCI_CLKMUXSTATUSREG_OFFSET 0x2c
#define PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_SHIFT 1
#define PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_MASK \
(0x1 << PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_SHIFT)
/*
* Private structures
*/
/**
* struct __prci_data - per-device-instance data
* @va: base virtual address of the PRCI IP block
* @parent: parent clk instance
*
* PRCI per-device instance data
*/
struct __prci_data {
void *base;
struct clk parent;
};
/**
* struct __prci_wrpll_data - WRPLL configuration and integration data
* @c: WRPLL current configuration record
* @bypass: fn ptr to code to bypass the WRPLL (if applicable; else NULL)
* @no_bypass: fn ptr to code to not bypass the WRPLL (if applicable; else NULL)
* @cfg0_offs: WRPLL CFG0 register offset (in bytes) from the PRCI base address
*
* @bypass and @no_bypass are used for WRPLL instances that contain a separate
* external glitchless clock mux downstream from the PLL. The WRPLL internal
* bypass mux is not glitchless.
*/
struct __prci_wrpll_data {
struct analogbits_wrpll_cfg c;
void (*bypass)(struct __prci_data *pd);
void (*no_bypass)(struct __prci_data *pd);
u8 cfg0_offs;
};
struct __prci_clock;
struct __prci_clock_ops {
int (*set_rate)(struct __prci_clock *pc,
unsigned long rate,
unsigned long parent_rate);
unsigned long (*round_rate)(struct __prci_clock *pc,
unsigned long rate,
unsigned long *parent_rate);
unsigned long (*recalc_rate)(struct __prci_clock *pc,
unsigned long parent_rate);
};
/**
* struct __prci_clock - describes a clock device managed by PRCI
* @name: user-readable clock name string - should match the manual
* @parent_name: parent name for this clock
* @ops: struct clk_ops for the Linux clock framework to use for control
* @hw: Linux-private clock data
* @pwd: WRPLL-specific data, associated with this clock (if not NULL)
* @pd: PRCI-specific data associated with this clock (if not NULL)
*
* PRCI clock data. Used by the PRCI driver to register PRCI-provided
* clocks to the Linux clock infrastructure.
*/
struct __prci_clock {
const char *name;
const char *parent_name;
const struct __prci_clock_ops *ops;
struct __prci_wrpll_data *pwd;
struct __prci_data *pd;
};
/*
* Private functions
*/
/**
* __prci_readl() - read from a PRCI register
* @pd: PRCI context
* @offs: register offset to read from (in bytes, from PRCI base address)
*
* Read the register located at offset @offs from the base virtual
* address of the PRCI register target described by @pd, and return
* the value to the caller.
*
* Context: Any context.
*
* Return: the contents of the register described by @pd and @offs.
*/
static u32 __prci_readl(struct __prci_data *pd, u32 offs)
{
return readl(pd->base + offs);
}
static void __prci_writel(u32 v, u32 offs, struct __prci_data *pd)
{
return writel(v, pd->base + offs);
}
/* WRPLL-related private functions */
/**
* __prci_wrpll_unpack() - unpack WRPLL configuration registers into parameters
* @c: ptr to a struct analogbits_wrpll_cfg record to write config into
* @r: value read from the PRCI PLL configuration register
*
* Given a value @r read from an FU540 PRCI PLL configuration register,
* split it into fields and populate it into the WRPLL configuration record
* pointed to by @c.
*
* The COREPLLCFG0 macros are used below, but the other *PLLCFG0 macros
* have the same register layout.
*
* Context: Any context.
*/
static void __prci_wrpll_unpack(struct analogbits_wrpll_cfg *c, u32 r)
{
u32 v;
v = r & PRCI_COREPLLCFG0_DIVR_MASK;
v >>= PRCI_COREPLLCFG0_DIVR_SHIFT;
c->divr = v;
v = r & PRCI_COREPLLCFG0_DIVF_MASK;
v >>= PRCI_COREPLLCFG0_DIVF_SHIFT;
c->divf = v;
v = r & PRCI_COREPLLCFG0_DIVQ_MASK;
v >>= PRCI_COREPLLCFG0_DIVQ_SHIFT;
c->divq = v;
v = r & PRCI_COREPLLCFG0_RANGE_MASK;
v >>= PRCI_COREPLLCFG0_RANGE_SHIFT;
c->range = v;
c->flags &= (WRPLL_FLAGS_INT_FEEDBACK_MASK |
WRPLL_FLAGS_EXT_FEEDBACK_MASK);
if (r & PRCI_COREPLLCFG0_FSE_MASK)
c->flags |= WRPLL_FLAGS_INT_FEEDBACK_MASK;
else
c->flags |= WRPLL_FLAGS_EXT_FEEDBACK_MASK;
}
/**
* __prci_wrpll_pack() - pack PLL configuration parameters into a register value
* @c: pointer to a struct analogbits_wrpll_cfg record containing the PLL's cfg
*
* Using a set of WRPLL configuration values pointed to by @c,
* assemble a PRCI PLL configuration register value, and return it to
* the caller.
*
* Context: Any context. Caller must ensure that the contents of the
* record pointed to by @c do not change during the execution
* of this function.
*
* Returns: a value suitable for writing into a PRCI PLL configuration
* register
*/
static u32 __prci_wrpll_pack(struct analogbits_wrpll_cfg *c)
{
u32 r = 0;
r |= c->divr << PRCI_COREPLLCFG0_DIVR_SHIFT;
r |= c->divf << PRCI_COREPLLCFG0_DIVF_SHIFT;
r |= c->divq << PRCI_COREPLLCFG0_DIVQ_SHIFT;
r |= c->range << PRCI_COREPLLCFG0_RANGE_SHIFT;
if (c->flags & WRPLL_FLAGS_INT_FEEDBACK_MASK)
r |= PRCI_COREPLLCFG0_FSE_MASK;
return r;
}
/**
* __prci_wrpll_read_cfg() - read the WRPLL configuration from the PRCI
* @pd: PRCI context
* @pwd: PRCI WRPLL metadata
*
* Read the current configuration of the PLL identified by @pwd from
* the PRCI identified by @pd, and store it into the local configuration
* cache in @pwd.
*
* Context: Any context. Caller must prevent the records pointed to by
* @pd and @pwd from changing during execution.
*/
static void __prci_wrpll_read_cfg(struct __prci_data *pd,
struct __prci_wrpll_data *pwd)
{
__prci_wrpll_unpack(&pwd->c, __prci_readl(pd, pwd->cfg0_offs));
}
/**
* __prci_wrpll_write_cfg() - write WRPLL configuration into the PRCI
* @pd: PRCI context
* @pwd: PRCI WRPLL metadata
* @c: WRPLL configuration record to write
*
* Write the WRPLL configuration described by @c into the WRPLL
* configuration register identified by @pwd in the PRCI instance
* described by @c. Make a cached copy of the WRPLL's current
* configuration so it can be used by other code.
*
* Context: Any context. Caller must prevent the records pointed to by
* @pd and @pwd from changing during execution.
*/
static void __prci_wrpll_write_cfg(struct __prci_data *pd,
struct __prci_wrpll_data *pwd,
struct analogbits_wrpll_cfg *c)
{
__prci_writel(__prci_wrpll_pack(c), pwd->cfg0_offs, pd);
memcpy(&pwd->c, c, sizeof(struct analogbits_wrpll_cfg));
}
/* Core clock mux control */
/**
* __prci_coreclksel_use_hfclk() - switch the CORECLK mux to output HFCLK
* @pd: struct __prci_data * for the PRCI containing the CORECLK mux reg
*
* Switch the CORECLK mux to the HFCLK input source; return once complete.
*
* Context: Any context. Caller must prevent concurrent changes to the
* PRCI_CORECLKSEL_OFFSET register.
*/
static void __prci_coreclksel_use_hfclk(struct __prci_data *pd)
{
u32 r;
r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);
r |= PRCI_CORECLKSEL_CORECLKSEL_MASK;
__prci_writel(r, PRCI_CORECLKSEL_OFFSET, pd);
r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET); /* barrier */
}
/**
* __prci_coreclksel_use_corepll() - switch the CORECLK mux to output COREPLL
* @pd: struct __prci_data * for the PRCI containing the CORECLK mux reg
*
* Switch the CORECLK mux to the PLL output clock; return once complete.
*
* Context: Any context. Caller must prevent concurrent changes to the
* PRCI_CORECLKSEL_OFFSET register.
*/
static void __prci_coreclksel_use_corepll(struct __prci_data *pd)
{
u32 r;
r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);
r &= ~PRCI_CORECLKSEL_CORECLKSEL_MASK;
__prci_writel(r, PRCI_CORECLKSEL_OFFSET, pd);
r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET); /* barrier */
}
static unsigned long sifive_fu540_prci_wrpll_recalc_rate(
struct __prci_clock *pc,
unsigned long parent_rate)
{
struct __prci_wrpll_data *pwd = pc->pwd;
return analogbits_wrpll_calc_output_rate(&pwd->c, parent_rate);
}
static unsigned long sifive_fu540_prci_wrpll_round_rate(
struct __prci_clock *pc,
unsigned long rate,
unsigned long *parent_rate)
{
struct __prci_wrpll_data *pwd = pc->pwd;
struct analogbits_wrpll_cfg c;
memcpy(&c, &pwd->c, sizeof(c));
analogbits_wrpll_configure_for_rate(&c, rate, *parent_rate);
return analogbits_wrpll_calc_output_rate(&c, *parent_rate);
}
static int sifive_fu540_prci_wrpll_set_rate(struct __prci_clock *pc,
unsigned long rate,
unsigned long parent_rate)
{
struct __prci_wrpll_data *pwd = pc->pwd;
struct __prci_data *pd = pc->pd;
int r;
r = analogbits_wrpll_configure_for_rate(&pwd->c, rate, parent_rate);
if (r)
return -ERANGE;
if (pwd->bypass)
pwd->bypass(pd);
__prci_wrpll_write_cfg(pd, pwd, &pwd->c);
udelay(analogbits_wrpll_calc_max_lock_us(&pwd->c));
if (pwd->no_bypass)
pwd->no_bypass(pd);
return 0;
}
static const struct __prci_clock_ops sifive_fu540_prci_wrpll_clk_ops = {
.set_rate = sifive_fu540_prci_wrpll_set_rate,
.round_rate = sifive_fu540_prci_wrpll_round_rate,
.recalc_rate = sifive_fu540_prci_wrpll_recalc_rate,
};
static const struct __prci_clock_ops sifive_fu540_prci_wrpll_ro_clk_ops = {
.recalc_rate = sifive_fu540_prci_wrpll_recalc_rate,
};
/* TLCLKSEL clock integration */
static unsigned long sifive_fu540_prci_tlclksel_recalc_rate(
struct __prci_clock *pc,
unsigned long parent_rate)
{
struct __prci_data *pd = pc->pd;
u32 v;
u8 div;
v = __prci_readl(pd, PRCI_CLKMUXSTATUSREG_OFFSET);
v &= PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_MASK;
div = v ? 1 : 2;
return div_u64(parent_rate, div);
}
static const struct __prci_clock_ops sifive_fu540_prci_tlclksel_clk_ops = {
.recalc_rate = sifive_fu540_prci_tlclksel_recalc_rate,
};
/*
* PRCI integration data for each WRPLL instance
*/
static struct __prci_wrpll_data __prci_corepll_data = {
.cfg0_offs = PRCI_COREPLLCFG0_OFFSET,
.bypass = __prci_coreclksel_use_hfclk,
.no_bypass = __prci_coreclksel_use_corepll,
};
static struct __prci_wrpll_data __prci_ddrpll_data = {
.cfg0_offs = PRCI_DDRPLLCFG0_OFFSET,
};
static struct __prci_wrpll_data __prci_gemgxlpll_data = {
.cfg0_offs = PRCI_GEMGXLPLLCFG0_OFFSET,
};
/*
* List of clock controls provided by the PRCI
*/
static struct __prci_clock __prci_init_clocks[] = {
[PRCI_CLK_COREPLL] = {
.name = "corepll",
.parent_name = "hfclk",
.ops = &sifive_fu540_prci_wrpll_clk_ops,
.pwd = &__prci_corepll_data,
},
[PRCI_CLK_DDRPLL] = {
.name = "ddrpll",
.parent_name = "hfclk",
.ops = &sifive_fu540_prci_wrpll_ro_clk_ops,
.pwd = &__prci_ddrpll_data,
},
[PRCI_CLK_GEMGXLPLL] = {
.name = "gemgxlpll",
.parent_name = "hfclk",
.ops = &sifive_fu540_prci_wrpll_clk_ops,
.pwd = &__prci_gemgxlpll_data,
},
[PRCI_CLK_TLCLK] = {
.name = "tlclk",
.parent_name = "corepll",
.ops = &sifive_fu540_prci_tlclksel_clk_ops,
},
};
static ulong sifive_fu540_prci_get_rate(struct clk *clk)
{
struct __prci_clock *pc;
if (ARRAY_SIZE(__prci_init_clocks) <= clk->id)
return -ENXIO;
pc = &__prci_init_clocks[clk->id];
if (!pc->pd || !pc->ops->recalc_rate)
return -ENXIO;
return pc->ops->recalc_rate(pc, clk_get_rate(&pc->pd->parent));
}
static ulong sifive_fu540_prci_set_rate(struct clk *clk, ulong rate)
{
int err;
struct __prci_clock *pc;
if (ARRAY_SIZE(__prci_init_clocks) <= clk->id)
return -ENXIO;
pc = &__prci_init_clocks[clk->id];
if (!pc->pd || !pc->ops->set_rate)
return -ENXIO;
err = pc->ops->set_rate(pc, rate, clk_get_rate(&pc->pd->parent));
if (err)
return err;
return rate;
}
static int sifive_fu540_prci_probe(struct udevice *dev)
{
int i, err;
struct __prci_clock *pc;
struct __prci_data *pd = dev_get_priv(dev);
pd->base = (void *)dev_read_addr(dev);
if (IS_ERR(pd->base))
return PTR_ERR(pd->base);
err = clk_get_by_index(dev, 0, &pd->parent);
if (err)
return err;
for (i = 0; i < ARRAY_SIZE(__prci_init_clocks); ++i) {
pc = &__prci_init_clocks[i];
pc->pd = pd;
if (pc->pwd)
__prci_wrpll_read_cfg(pd, pc->pwd);
}
return 0;
}
static struct clk_ops sifive_fu540_prci_ops = {
.set_rate = sifive_fu540_prci_set_rate,
.get_rate = sifive_fu540_prci_get_rate,
};
static const struct udevice_id sifive_fu540_prci_ids[] = {
{ .compatible = "sifive,fu540-c000-prci0" },
{ .compatible = "sifive,aloeprci0" },
{ }
};
U_BOOT_DRIVER(sifive_fu540_prci) = {
.name = "sifive-fu540-prci",
.id = UCLASS_CLK,
.of_match = sifive_fu540_prci_ids,
.probe = sifive_fu540_prci_probe,
.ops = &sifive_fu540_prci_ops,
.priv_auto_alloc_size = sizeof(struct __prci_data),
};