u-boot/drivers/clk/mvebu/armada-37xx-periph.c
Marek Behún 3d9c1d5dda clk: armada-37xx: Set DM_FLAG_PRE_RELOC
Setting DM_FLAG_PRE_RELOC for Armada 3720 clock drivers (TBG and
peripheral clocks) makes it possible for serial driver to retrieve clock
rates via clk API.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-07-08 16:40:52 +02:00

630 lines
14 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Marvell Armada 37xx SoC Peripheral clocks
*
* Marek Behun <marek.behun@nic.cz>
*
* Based on Linux driver by:
* Gregory CLEMENT <gregory.clement@free-electrons.com>
*/
#include <common.h>
#include <malloc.h>
#include <clk-uclass.h>
#include <clk.h>
#include <dm.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#define TBG_SEL 0x0
#define DIV_SEL0 0x4
#define DIV_SEL1 0x8
#define DIV_SEL2 0xC
#define CLK_SEL 0x10
#define CLK_DIS 0x14
enum a37xx_periph_parent {
TBG_A_P = 0,
TBG_B_P = 1,
TBG_A_S = 2,
TBG_B_S = 3,
MAX_TBG_PARENTS = 4,
XTAL = 4,
MAX_PARENTS = 5,
};
static const struct {
const char *name;
enum a37xx_periph_parent parent;
} a37xx_periph_parent_names[] = {
{ "TBG-A-P", TBG_A_P },
{ "TBG-B-P", TBG_B_P },
{ "TBG-A-S", TBG_A_S },
{ "TBG-B-S", TBG_B_S },
{ "xtal", XTAL },
};
struct clk_periph;
struct a37xx_periphclk {
void __iomem *reg;
ulong parents[MAX_PARENTS];
const struct clk_periph *clks;
bool clk_has_periph_parent[16];
int clk_parent[16];
int count;
};
struct clk_div_table {
u32 div;
u32 val;
};
struct clk_periph {
const char *name;
const char *parent_name;
u32 disable_bit;
int mux_shift;
const struct clk_div_table *div_table[2];
s32 div_reg_off[2];
u32 div_mask[2];
int div_shift[2];
unsigned can_gate : 1;
unsigned can_mux : 1;
unsigned dividers : 2;
};
static const struct clk_div_table div_table1[] = {
{ 1, 1 },
{ 2, 2 },
{ 0, 0 },
};
static const struct clk_div_table div_table2[] = {
{ 2, 0 },
{ 4, 1 },
{ 0, 0 },
};
static const struct clk_div_table div_table6[] = {
{ 1, 1 },
{ 2, 2 },
{ 3, 3 },
{ 4, 4 },
{ 5, 5 },
{ 6, 6 },
{ 0, 0 },
};
#define CLK_FULL_DD(_n, _d, _mux, _r0, _r1, _s0, _s1) \
{ \
.name = #_n, \
.disable_bit = BIT(_d), \
.mux_shift = _mux, \
.div_table[0] = div_table6, \
.div_table[1] = div_table6, \
.div_reg_off[0] = _r0, \
.div_reg_off[1] = _r1, \
.div_shift[0] = _s0, \
.div_shift[1] = _s1, \
.div_mask[0] = 7, \
.div_mask[1] = 7, \
.can_gate = 1, \
.can_mux = 1, \
.dividers = 2, \
}
#define CLK_FULL(_n, _d, _mux, _r, _s, _m, _t) \
{ \
.name = #_n, \
.disable_bit = BIT(_d), \
.mux_shift = _mux, \
.div_table[0] = _t, \
.div_reg_off[0] = _r, \
.div_shift[0] = _s, \
.div_mask[0] = _m, \
.can_gate = 1, \
.can_mux = 1, \
.dividers = 1, \
}
#define CLK_GATE_DIV(_n, _d, _r, _s, _m, _t, _p) \
{ \
.name = #_n, \
.parent_name = _p, \
.disable_bit = BIT(_d), \
.div_table[0] = _t, \
.div_reg_off[0] = _r, \
.div_shift[0] = _s, \
.div_mask[0] = _m, \
.can_gate = 1, \
.dividers = 1, \
}
#define CLK_GATE(_n, _d, _p) \
{ \
.name = #_n, \
.parent_name = _p, \
.disable_bit = BIT(_d), \
.can_gate = 1, \
}
#define CLK_MUX_DIV(_n, _mux, _r, _s, _m, _t) \
{ \
.name = #_n, \
.mux_shift = _mux, \
.div_table[0] = _t, \
.div_reg_off[0] = _r, \
.div_shift[0] = _s, \
.div_mask[0] = _m, \
.can_mux = 1, \
.dividers = 1, \
}
#define CLK_MUX_DD(_n, _mux, _r0, _r1, _s0, _s1) \
{ \
.name = #_n, \
.mux_shift = _mux, \
.div_table[0] = div_table6, \
.div_table[1] = div_table6, \
.div_reg_off[0] = _r0, \
.div_reg_off[1] = _r1, \
.div_shift[0] = _s0, \
.div_shift[1] = _s1, \
.div_mask[0] = 7, \
.div_mask[1] = 7, \
.can_mux = 1, \
.dividers = 2, \
}
/* NB periph clocks */
static const struct clk_periph clks_nb[] = {
CLK_FULL_DD(mmc, 2, 0, DIV_SEL2, DIV_SEL2, 16, 13),
CLK_FULL_DD(sata_host, 3, 2, DIV_SEL2, DIV_SEL2, 10, 7),
CLK_FULL_DD(sec_at, 6, 4, DIV_SEL1, DIV_SEL1, 3, 0),
CLK_FULL_DD(sec_dap, 7, 6, DIV_SEL1, DIV_SEL1, 9, 6),
CLK_FULL_DD(tscem, 8, 8, DIV_SEL1, DIV_SEL1, 15, 12),
CLK_FULL(tscem_tmx, 10, 10, DIV_SEL1, 18, 7, div_table6),
CLK_GATE(avs, 11, "xtal"),
CLK_FULL_DD(sqf, 12, 12, DIV_SEL1, DIV_SEL1, 27, 24),
CLK_FULL_DD(pwm, 13, 14, DIV_SEL0, DIV_SEL0, 3, 0),
CLK_GATE(i2c_2, 16, "xtal"),
CLK_GATE(i2c_1, 17, "xtal"),
CLK_GATE_DIV(ddr_phy, 19, DIV_SEL0, 18, 1, div_table2, "TBG-A-S"),
CLK_FULL_DD(ddr_fclk, 21, 16, DIV_SEL0, DIV_SEL0, 15, 12),
CLK_FULL(trace, 22, 18, DIV_SEL0, 20, 7, div_table6),
CLK_FULL(counter, 23, 20, DIV_SEL0, 23, 7, div_table6),
CLK_FULL_DD(eip97, 24, 24, DIV_SEL2, DIV_SEL2, 22, 19),
CLK_MUX_DIV(cpu, 22, DIV_SEL0, 28, 7, div_table6),
{ },
};
/* SB periph clocks */
static const struct clk_periph clks_sb[] = {
CLK_MUX_DD(gbe_50, 6, DIV_SEL2, DIV_SEL2, 6, 9),
CLK_MUX_DD(gbe_core, 8, DIV_SEL1, DIV_SEL1, 18, 21),
CLK_MUX_DD(gbe_125, 10, DIV_SEL1, DIV_SEL1, 6, 9),
CLK_GATE(gbe1_50, 0, "gbe_50"),
CLK_GATE(gbe0_50, 1, "gbe_50"),
CLK_GATE(gbe1_125, 2, "gbe_125"),
CLK_GATE(gbe0_125, 3, "gbe_125"),
CLK_GATE_DIV(gbe1_core, 4, DIV_SEL1, 13, 1, div_table1, "gbe_core"),
CLK_GATE_DIV(gbe0_core, 5, DIV_SEL1, 14, 1, div_table1, "gbe_core"),
CLK_GATE_DIV(gbe_bm, 12, DIV_SEL1, 0, 1, div_table1, "gbe_core"),
CLK_FULL_DD(sdio, 11, 14, DIV_SEL0, DIV_SEL0, 3, 6),
CLK_FULL_DD(usb32_usb2_sys, 16, 16, DIV_SEL0, DIV_SEL0, 9, 12),
CLK_FULL_DD(usb32_ss_sys, 17, 18, DIV_SEL0, DIV_SEL0, 15, 18),
{ },
};
static int get_mux(struct a37xx_periphclk *priv, int shift)
{
return (readl(priv->reg + TBG_SEL) >> shift) & 3;
}
static void set_mux(struct a37xx_periphclk *priv, int shift, int val)
{
u32 reg;
reg = readl(priv->reg + TBG_SEL);
reg &= ~(3 << shift);
reg |= (val & 3) << shift;
writel(reg, priv->reg + TBG_SEL);
}
static ulong periph_clk_get_rate(struct a37xx_periphclk *priv, int id);
static ulong get_parent_rate(struct a37xx_periphclk *priv, int id)
{
const struct clk_periph *clk = &priv->clks[id];
ulong res;
if (clk->can_mux) {
/* parent is one of TBG clocks */
int tbg = get_mux(priv, clk->mux_shift);
res = priv->parents[tbg];
} else if (priv->clk_has_periph_parent[id]) {
/* parent is one of other periph clocks */
if (priv->clk_parent[id] >= priv->count)
return -EINVAL;
res = periph_clk_get_rate(priv, priv->clk_parent[id]);
} else {
/* otherwise parent is one of TBGs or XTAL */
if (priv->clk_parent[id] >= MAX_PARENTS)
return -EINVAL;
res = priv->parents[priv->clk_parent[id]];
}
return res;
}
static ulong get_div(struct a37xx_periphclk *priv,
const struct clk_periph *clk, int idx)
{
const struct clk_div_table *i;
u32 reg;
reg = readl(priv->reg + clk->div_reg_off[idx]);
reg = (reg >> clk->div_shift[idx]) & clk->div_mask[idx];
/* find divisor for register value val */
for (i = clk->div_table[idx]; i && i->div != 0; ++i)
if (i->val == reg)
return i->div;
return 0;
}
static void set_div_val(struct a37xx_periphclk *priv,
const struct clk_periph *clk, int idx, int val)
{
u32 reg;
reg = readl(priv->reg + clk->div_reg_off[idx]);
reg &= ~(clk->div_mask[idx] << clk->div_shift[idx]);
reg |= (val & clk->div_mask[idx]) << clk->div_shift[idx];
writel(reg, priv->reg + clk->div_reg_off[idx]);
}
static ulong periph_clk_get_rate(struct a37xx_periphclk *priv, int id)
{
const struct clk_periph *clk = &priv->clks[id];
ulong rate, div;
int i;
rate = get_parent_rate(priv, id);
if (rate == -EINVAL)
return -EINVAL;
/* divide the parent rate by dividers */
div = 1;
for (i = 0; i < clk->dividers; ++i)
div *= get_div(priv, clk, i);
if (!div)
return 0;
return DIV_ROUND_UP(rate, div);
}
static ulong armada_37xx_periph_clk_get_rate(struct clk *clk)
{
struct a37xx_periphclk *priv = dev_get_priv(clk->dev);
if (clk->id >= priv->count)
return -EINVAL;
return periph_clk_get_rate(priv, clk->id);
}
static int periph_clk_enable(struct clk *clk, int enable)
{
struct a37xx_periphclk *priv = dev_get_priv(clk->dev);
const struct clk_periph *periph_clk = &priv->clks[clk->id];
if (clk->id >= priv->count)
return -EINVAL;
if (!periph_clk->can_gate)
return -EINVAL;
if (enable)
clrbits_le32(priv->reg + CLK_DIS, periph_clk->disable_bit);
else
setbits_le32(priv->reg + CLK_DIS, periph_clk->disable_bit);
return 0;
}
static int armada_37xx_periph_clk_enable(struct clk *clk)
{
return periph_clk_enable(clk, 1);
}
static int armada_37xx_periph_clk_disable(struct clk *clk)
{
return periph_clk_enable(clk, 0);
}
#define diff(a, b) abs((long)(a) - (long)(b))
static ulong find_best_div(const struct clk_div_table *t0,
const struct clk_div_table *t1, ulong parent_rate,
ulong req_rate, int *v0, int *v1)
{
const struct clk_div_table *i, *j;
ulong rate, best_rate = 0;
for (i = t0; i && i->div; ++i) {
for (j = t1; j && j->div; ++j) {
rate = DIV_ROUND_UP(parent_rate, i->div * j->div);
if (!best_rate ||
diff(rate, req_rate) < diff(best_rate, req_rate)) {
best_rate = rate;
*v0 = i->val;
*v1 = j->val;
}
}
}
return best_rate;
}
static ulong armada_37xx_periph_clk_set_rate(struct clk *clk, ulong req_rate)
{
struct a37xx_periphclk *priv = dev_get_priv(clk->dev);
const struct clk_periph *periph_clk = &priv->clks[clk->id];
ulong rate, old_rate, parent_rate;
int div_val0 = 0, div_val1 = 0;
const struct clk_div_table *t1;
static const struct clk_div_table empty_table[2] = {
{ 1, 0 },
{ 0, 0 }
};
if (clk->id > priv->count)
return -EINVAL;
old_rate = periph_clk_get_rate(priv, clk->id);
if (old_rate == -EINVAL)
return -EINVAL;
if (old_rate == req_rate)
return old_rate;
if (!periph_clk->can_gate || !periph_clk->dividers)
return -EINVAL;
parent_rate = get_parent_rate(priv, clk->id);
if (parent_rate == -EINVAL)
return -EINVAL;
t1 = empty_table;
if (periph_clk->dividers > 1)
t1 = periph_clk->div_table[1];
rate = find_best_div(periph_clk->div_table[0], t1, parent_rate,
req_rate, &div_val0, &div_val1);
periph_clk_enable(clk, 0);
set_div_val(priv, periph_clk, 0, div_val0);
if (periph_clk->dividers > 1)
set_div_val(priv, periph_clk, 1, div_val1);
periph_clk_enable(clk, 1);
return rate;
}
static int armada_37xx_periph_clk_set_parent(struct clk *clk,
struct clk *parent)
{
struct a37xx_periphclk *priv = dev_get_priv(clk->dev);
const struct clk_periph *periph_clk = &priv->clks[clk->id];
struct clk check_parent;
int ret;
/* We also check if parent is our TBG clock */
if (clk->id > priv->count || parent->id >= MAX_TBG_PARENTS)
return -EINVAL;
if (!periph_clk->can_mux || !periph_clk->can_gate)
return -EINVAL;
ret = clk_get_by_index(clk->dev, 0, &check_parent);
if (ret < 0)
return ret;
if (parent->dev != check_parent.dev)
ret = -EINVAL;
clk_free(&check_parent);
if (ret < 0)
return ret;
periph_clk_enable(clk, 0);
set_mux(priv, periph_clk->mux_shift, parent->id);
periph_clk_enable(clk, 1);
return 0;
}
#if defined(CONFIG_CMD_CLK) && defined(CONFIG_CLK_ARMADA_3720)
static int armada_37xx_periph_clk_dump(struct udevice *dev)
{
struct a37xx_periphclk *priv = dev_get_priv(dev);
const struct clk_periph *clks;
int i;
if (!priv)
return -ENODEV;
clks = priv->clks;
for (i = 0; i < priv->count; ++i)
printf(" %s at %lu Hz\n", clks[i].name,
periph_clk_get_rate(priv, i));
printf("\n");
return 0;
}
static int clk_dump(const char *name, int (*func)(struct udevice *))
{
struct udevice *dev;
if (uclass_get_device_by_name(UCLASS_CLK, name, &dev)) {
printf("Cannot find device %s\n", name);
return -ENODEV;
}
return func(dev);
}
int armada_37xx_tbg_clk_dump(struct udevice *);
int soc_clk_dump(void)
{
printf(" xtal at %u000000 Hz\n\n", get_ref_clk());
if (clk_dump("tbg@13200", armada_37xx_tbg_clk_dump))
return 1;
if (clk_dump("nb-periph-clk@13000",
armada_37xx_periph_clk_dump))
return 1;
if (clk_dump("sb-periph-clk@18000",
armada_37xx_periph_clk_dump))
return 1;
return 0;
}
#endif
static int armada_37xx_periph_clk_probe(struct udevice *dev)
{
struct a37xx_periphclk *priv = dev_get_priv(dev);
const struct clk_periph *clks;
int ret, i;
clks = (const struct clk_periph *)dev_get_driver_data(dev);
if (!clks)
return -ENODEV;
priv->reg = dev_read_addr_ptr(dev);
if (!priv->reg) {
dev_err(dev, "no io address\n");
return -ENODEV;
}
/* count clk_periph nodes */
priv->count = 0;
while (clks[priv->count].name)
priv->count++;
priv->clks = clks;
/* assign parent IDs to nodes which have non-NULL parent_name */
for (i = 0; i < priv->count; ++i) {
int j;
if (!clks[i].parent_name)
continue;
/* first try if parent_name is one of TBGs or XTAL */
for (j = 0; j < MAX_PARENTS; ++j)
if (!strcmp(clks[i].parent_name,
a37xx_periph_parent_names[j].name))
break;
if (j < MAX_PARENTS) {
priv->clk_has_periph_parent[i] = false;
priv->clk_parent[i] =
a37xx_periph_parent_names[j].parent;
continue;
}
/* else parent_name should be one of other periph clocks */
for (j = 0; j < priv->count; ++j) {
if (!strcmp(clks[i].parent_name, clks[j].name))
break;
}
if (j < priv->count) {
priv->clk_has_periph_parent[i] = true;
priv->clk_parent[i] = j;
continue;
}
dev_err(dev, "undefined parent %s\n", clks[i].parent_name);
return -EINVAL;
}
for (i = 0; i < MAX_PARENTS; ++i) {
struct clk clk;
if (i == XTAL) {
priv->parents[i] = get_ref_clk() * 1000000;
continue;
}
ret = clk_get_by_index(dev, i, &clk);
if (ret) {
dev_err(dev, "one of parent clocks (%i) missing: %i\n",
i, ret);
return -ENODEV;
}
priv->parents[i] = clk_get_rate(&clk);
clk_free(&clk);
}
return 0;
}
static const struct clk_ops armada_37xx_periph_clk_ops = {
.get_rate = armada_37xx_periph_clk_get_rate,
.set_rate = armada_37xx_periph_clk_set_rate,
.set_parent = armada_37xx_periph_clk_set_parent,
.enable = armada_37xx_periph_clk_enable,
.disable = armada_37xx_periph_clk_disable,
};
static const struct udevice_id armada_37xx_periph_clk_ids[] = {
{
.compatible = "marvell,armada-3700-periph-clock-nb",
.data = (ulong)clks_nb,
},
{
.compatible = "marvell,armada-3700-periph-clock-sb",
.data = (ulong)clks_sb,
},
{}
};
U_BOOT_DRIVER(armada_37xx_periph_clk) = {
.name = "armada_37xx_periph_clk",
.id = UCLASS_CLK,
.of_match = armada_37xx_periph_clk_ids,
.ops = &armada_37xx_periph_clk_ops,
.priv_auto = sizeof(struct a37xx_periphclk),
.probe = armada_37xx_periph_clk_probe,
.flags = DM_FLAG_PRE_RELOC,
};