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u-boot/drivers/clk/clk-hsdk-cgu.c
Eugeniy Paltsev e80dac0ab8 ARC: clk: introduce HSDK CGU clock driver 
Synopsys HSDK clock controller generates and supplies clocks to various
controllers and peripherals within the SoC.

Each clock has assigned identifier and client device tree nodes can use
this identifier to specify the clock which they consume. All available
clocks are defined as preprocessor macros in the
dt-bindings/clock/snps,hsdk-cgu.h header and can be used in device
tree sources.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2017-12-11 11:36:23 +03:00

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/*
* Synopsys HSDK SDP CGU clock driver
*
* Copyright (C) 2017 Synopsys
* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <common.h>
#include <clk-uclass.h>
#include <div64.h>
#include <dm.h>
#include <linux/io.h>
/*
* Synopsys ARC HSDK clock tree.
*
* ------------------
* | 33.33 MHz xtal |
* ------------------
* |
* | -----------
* |-->| ARC PLL |
* | -----------
* | |
* | |-->|CGU_ARC_IDIV|----------->
* | |-->|CREG_CORE_IF_DIV|------->
* |
* | --------------
* |-->| SYSTEM PLL |
* | --------------
* | |
* | |-->|CGU_SYS_IDIV_APB|------->
* | |-->|CGU_SYS_IDIV_AXI|------->
* | |-->|CGU_SYS_IDIV_*|--------->
* | |-->|CGU_SYS_IDIV_EBI_REF|--->
* |
* | --------------
* |-->| TUNNEL PLL |
* | --------------
* | |
* | |-->|CGU_TUN_IDIV|----------->
* |
* | ------------
* |-->| HDMI PLL |
* | ------------
* | |
* | |-->|CGU_HDMI_IDIV_APB|------>
* |
* | -----------
* |-->| DDR PLL |
* -----------
* |
* |---------------------------->
*/
DECLARE_GLOBAL_DATA_PTR;
#define CGU_ARC_IDIV 0x080
#define CGU_TUN_IDIV 0x380
#define CGU_HDMI_IDIV_APB 0x480
#define CGU_SYS_IDIV_APB 0x180
#define CGU_SYS_IDIV_AXI 0x190
#define CGU_SYS_IDIV_ETH 0x1A0
#define CGU_SYS_IDIV_USB 0x1B0
#define CGU_SYS_IDIV_SDIO 0x1C0
#define CGU_SYS_IDIV_HDMI 0x1D0
#define CGU_SYS_IDIV_GFX_CORE 0x1E0
#define CGU_SYS_IDIV_GFX_DMA 0x1F0
#define CGU_SYS_IDIV_GFX_CFG 0x200
#define CGU_SYS_IDIV_DMAC_CORE 0x210
#define CGU_SYS_IDIV_DMAC_CFG 0x220
#define CGU_SYS_IDIV_SDIO_REF 0x230
#define CGU_SYS_IDIV_SPI_REF 0x240
#define CGU_SYS_IDIV_I2C_REF 0x250
#define CGU_SYS_IDIV_UART_REF 0x260
#define CGU_SYS_IDIV_EBI_REF 0x270
#define CGU_IDIV_MASK 0xFF /* All idiv have 8 significant bits */
#define CGU_ARC_PLL 0x0
#define CGU_SYS_PLL 0x10
#define CGU_DDR_PLL 0x20
#define CGU_TUN_PLL 0x30
#define CGU_HDMI_PLL 0x40
#define CGU_PLL_CTRL 0x000 /* ARC PLL control register */
#define CGU_PLL_STATUS 0x004 /* ARC PLL status register */
#define CGU_PLL_FMEAS 0x008 /* ARC PLL frequency measurement register */
#define CGU_PLL_MON 0x00C /* ARC PLL monitor register */
#define CGU_PLL_CTRL_ODIV_SHIFT 2
#define CGU_PLL_CTRL_IDIV_SHIFT 4
#define CGU_PLL_CTRL_FBDIV_SHIFT 9
#define CGU_PLL_CTRL_BAND_SHIFT 20
#define CGU_PLL_CTRL_ODIV_MASK GENMASK(3, CGU_PLL_CTRL_ODIV_SHIFT)
#define CGU_PLL_CTRL_IDIV_MASK GENMASK(8, CGU_PLL_CTRL_IDIV_SHIFT)
#define CGU_PLL_CTRL_FBDIV_MASK GENMASK(15, CGU_PLL_CTRL_FBDIV_SHIFT)
#define CGU_PLL_CTRL_PD BIT(0)
#define CGU_PLL_CTRL_BYPASS BIT(1)
#define CGU_PLL_STATUS_LOCK BIT(0)
#define CGU_PLL_STATUS_ERR BIT(1)
#define HSDK_PLL_MAX_LOCK_TIME 100 /* 100 us */
#define CREG_CORE_IF_DIV 0x000 /* ARC CORE interface divider */
#define CORE_IF_CLK_THRESHOLD_HZ 500000000
#define CREG_CORE_IF_CLK_DIV_1 0x0
#define CREG_CORE_IF_CLK_DIV_2 0x1
#define PARENT_RATE 33333333 /* fixed clock - xtal */
#define CGU_MAX_CLOCKS 24
struct hsdk_pll_cfg {
u32 rate;
u32 idiv;
u32 fbdiv;
u32 odiv;
u32 band;
};
static const struct hsdk_pll_cfg asdt_pll_cfg[] = {
{ 100000000, 0, 11, 3, 0 },
{ 125000000, 0, 14, 3, 0 },
{ 133000000, 0, 15, 3, 0 },
{ 150000000, 0, 17, 3, 0 },
{ 200000000, 1, 47, 3, 0 },
{ 233000000, 1, 27, 2, 0 },
{ 300000000, 1, 35, 2, 0 },
{ 333000000, 1, 39, 2, 0 },
{ 400000000, 1, 47, 2, 0 },
{ 500000000, 0, 14, 1, 0 },
{ 600000000, 0, 17, 1, 0 },
{ 700000000, 0, 20, 1, 0 },
{ 800000000, 0, 23, 1, 0 },
{ 900000000, 1, 26, 0, 0 },
{ 1000000000, 1, 29, 0, 0 },
{ 1100000000, 1, 32, 0, 0 },
{ 1200000000, 1, 35, 0, 0 },
{ 1300000000, 1, 38, 0, 0 },
{ 1400000000, 1, 41, 0, 0 },
{ 1500000000, 1, 44, 0, 0 },
{ 1600000000, 1, 47, 0, 0 },
{}
};
static const struct hsdk_pll_cfg hdmi_pll_cfg[] = {
{ 297000000, 0, 21, 2, 0 },
{ 540000000, 0, 19, 1, 0 },
{ 594000000, 0, 21, 1, 0 },
{}
};
struct hsdk_cgu_clk {
/* CGU block register */
void __iomem *cgu_regs;
/* CREG block register */
void __iomem *creg_regs;
/* PLLs registers */
void __iomem *regs;
/* PLLs special registers */
void __iomem *spec_regs;
/* PLLs devdata */
const struct hsdk_pll_devdata *pll_devdata;
/* Dividers registers */
void __iomem *idiv_regs;
};
struct hsdk_pll_devdata {
const struct hsdk_pll_cfg *pll_cfg;
int (*update_rate)(struct hsdk_cgu_clk *clk, unsigned long rate,
const struct hsdk_pll_cfg *cfg);
};
static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *, unsigned long,
const struct hsdk_pll_cfg *);
static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *, unsigned long,
const struct hsdk_pll_cfg *);
static const struct hsdk_pll_devdata core_pll_dat = {
.pll_cfg = asdt_pll_cfg,
.update_rate = hsdk_pll_core_update_rate,
};
static const struct hsdk_pll_devdata sdt_pll_dat = {
.pll_cfg = asdt_pll_cfg,
.update_rate = hsdk_pll_comm_update_rate,
};
static const struct hsdk_pll_devdata hdmi_pll_dat = {
.pll_cfg = hdmi_pll_cfg,
.update_rate = hsdk_pll_comm_update_rate,
};
static ulong idiv_set(struct clk *, ulong);
static ulong idiv_get(struct clk *);
static int idiv_off(struct clk *);
static ulong pll_set(struct clk *, ulong);
static ulong pll_get(struct clk *);
struct hsdk_cgu_clock_map {
u32 cgu_pll_oft;
u32 creg_div_oft;
u32 cgu_div_oft;
const struct hsdk_pll_devdata *pll_devdata;
ulong (*get_rate)(struct clk *clk);
ulong (*set_rate)(struct clk *clk, ulong rate);
int (*disable)(struct clk *clk);
};
static const struct hsdk_cgu_clock_map clock_map[] = {
{ CGU_ARC_PLL, 0, 0, &core_pll_dat, pll_get, pll_set, NULL },
{ CGU_ARC_PLL, 0, CGU_ARC_IDIV, &core_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_DDR_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
{ CGU_SYS_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_APB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_AXI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_ETH, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_USB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_SDIO, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_HDMI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_DMA, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_DMAC_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_DMAC_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_SDIO_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_SPI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_I2C_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_UART_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_SYS_PLL, 0, CGU_SYS_IDIV_EBI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_TUN_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
{ CGU_TUN_PLL, 0, CGU_TUN_IDIV, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
{ CGU_HDMI_PLL, 0, 0, &hdmi_pll_dat, pll_get, pll_set, NULL },
{ CGU_HDMI_PLL, 0, CGU_HDMI_IDIV_APB, &hdmi_pll_dat, idiv_get, idiv_set, idiv_off }
};
static inline void hsdk_idiv_write(struct hsdk_cgu_clk *clk, u32 val)
{
iowrite32(val, clk->idiv_regs);
}
static inline u32 hsdk_idiv_read(struct hsdk_cgu_clk *clk)
{
return ioread32(clk->idiv_regs);
}
static inline void hsdk_pll_write(struct hsdk_cgu_clk *clk, u32 reg, u32 val)
{
iowrite32(val, clk->regs + reg);
}
static inline u32 hsdk_pll_read(struct hsdk_cgu_clk *clk, u32 reg)
{
return ioread32(clk->regs + reg);
}
static inline void hsdk_pll_spcwrite(struct hsdk_cgu_clk *clk, u32 reg, u32 val)
{
iowrite32(val, clk->spec_regs + reg);
}
static inline u32 hsdk_pll_spcread(struct hsdk_cgu_clk *clk, u32 reg)
{
return ioread32(clk->spec_regs + reg);
}
static inline void hsdk_pll_set_cfg(struct hsdk_cgu_clk *clk,
const struct hsdk_pll_cfg *cfg)
{
u32 val = 0;
/* Powerdown and Bypass bits should be cleared */
val |= cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT;
val |= cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT;
val |= cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT;
val |= cfg->band << CGU_PLL_CTRL_BAND_SHIFT;
pr_debug("write configurarion: %#x\n", val);
hsdk_pll_write(clk, CGU_PLL_CTRL, val);
}
static inline bool hsdk_pll_is_locked(struct hsdk_cgu_clk *clk)
{
return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_LOCK);
}
static inline bool hsdk_pll_is_err(struct hsdk_cgu_clk *clk)
{
return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_ERR);
}
static ulong pll_get(struct clk *sclk)
{
u32 val;
u64 rate;
u32 idiv, fbdiv, odiv;
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
val = hsdk_pll_read(clk, CGU_PLL_CTRL);
pr_debug("current configurarion: %#x\n", val);
/* Check if PLL is disabled */
if (val & CGU_PLL_CTRL_PD)
return 0;
/* Check if PLL is bypassed */
if (val & CGU_PLL_CTRL_BYPASS)
return PARENT_RATE;
/* input divider = reg.idiv + 1 */
idiv = 1 + ((val & CGU_PLL_CTRL_IDIV_MASK) >> CGU_PLL_CTRL_IDIV_SHIFT);
/* fb divider = 2*(reg.fbdiv + 1) */
fbdiv = 2 * (1 + ((val & CGU_PLL_CTRL_FBDIV_MASK) >> CGU_PLL_CTRL_FBDIV_SHIFT));
/* output divider = 2^(reg.odiv) */
odiv = 1 << ((val & CGU_PLL_CTRL_ODIV_MASK) >> CGU_PLL_CTRL_ODIV_SHIFT);
rate = (u64)PARENT_RATE * fbdiv;
do_div(rate, idiv * odiv);
return rate;
}
static unsigned long hsdk_pll_round_rate(struct clk *sclk, unsigned long rate)
{
int i;
unsigned long best_rate;
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg;
if (pll_cfg[0].rate == 0)
return -EINVAL;
best_rate = pll_cfg[0].rate;
for (i = 1; pll_cfg[i].rate != 0; i++) {
if (abs(rate - pll_cfg[i].rate) < abs(rate - best_rate))
best_rate = pll_cfg[i].rate;
}
pr_debug("chosen best rate: %lu\n", best_rate);
return best_rate;
}
static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *clk,
unsigned long rate,
const struct hsdk_pll_cfg *cfg)
{
hsdk_pll_set_cfg(clk, cfg);
/*
* Wait until CGU relocks and check error status.
* If after timeout CGU is unlocked yet return error.
*/
udelay(HSDK_PLL_MAX_LOCK_TIME);
if (!hsdk_pll_is_locked(clk))
return -ETIMEDOUT;
if (hsdk_pll_is_err(clk))
return -EINVAL;
return 0;
}
static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *clk,
unsigned long rate,
const struct hsdk_pll_cfg *cfg)
{
/*
* When core clock exceeds 500MHz, the divider for the interface
* clock must be programmed to div-by-2.
*/
if (rate > CORE_IF_CLK_THRESHOLD_HZ)
hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_2);
hsdk_pll_set_cfg(clk, cfg);
/*
* Wait until CGU relocks and check error status.
* If after timeout CGU is unlocked yet return error.
*/
udelay(HSDK_PLL_MAX_LOCK_TIME);
if (!hsdk_pll_is_locked(clk))
return -ETIMEDOUT;
if (hsdk_pll_is_err(clk))
return -EINVAL;
/*
* Program divider to div-by-1 if we succesfuly set core clock below
* 500MHz threshold.
*/
if (rate <= CORE_IF_CLK_THRESHOLD_HZ)
hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_1);
return 0;
}
static ulong pll_set(struct clk *sclk, ulong rate)
{
int i;
unsigned long best_rate;
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg;
best_rate = hsdk_pll_round_rate(sclk, rate);
for (i = 0; pll_cfg[i].rate != 0; i++) {
if (pll_cfg[i].rate == best_rate) {
return clk->pll_devdata->update_rate(clk, best_rate,
&pll_cfg[i]);
}
}
pr_err("invalid rate=%ld, parent_rate=%d\n", best_rate, PARENT_RATE);
return -EINVAL;
}
static int idiv_off(struct clk *sclk)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
hsdk_idiv_write(clk, 0);
return 0;
}
static ulong idiv_get(struct clk *sclk)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
ulong parent_rate = pll_get(sclk);
u32 div_factor = hsdk_idiv_read(clk);
div_factor &= CGU_IDIV_MASK;
pr_debug("current configurarion: %#x (%d)\n", div_factor, div_factor);
if (div_factor == 0)
return 0;
return parent_rate / div_factor;
}
static ulong idiv_set(struct clk *sclk, ulong rate)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
ulong parent_rate = pll_get(sclk);
u32 div_factor;
div_factor = parent_rate / rate;
if (abs(rate - parent_rate / (div_factor + 1)) <=
abs(rate - parent_rate / div_factor)) {
div_factor += 1;
}
if (div_factor & ~CGU_IDIV_MASK) {
pr_err("invalid rate=%ld, parent_rate=%ld, div=%d: max divider valie is%d\n",
rate, parent_rate, div_factor, CGU_IDIV_MASK);
div_factor = CGU_IDIV_MASK;
}
if (div_factor == 0) {
pr_err("invalid rate=%ld, parent_rate=%ld, div=%d: min divider valie is 1\n",
rate, parent_rate, div_factor);
div_factor = 1;
}
hsdk_idiv_write(clk, div_factor);
return 0;
}
static int hsdk_prepare_clock_tree_branch(struct clk *sclk)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
if (sclk->id >= CGU_MAX_CLOCKS)
return -EINVAL;
clk->pll_devdata = clock_map[sclk->id].pll_devdata;
clk->regs = clk->cgu_regs + clock_map[sclk->id].cgu_pll_oft;
clk->spec_regs = clk->creg_regs + clock_map[sclk->id].creg_div_oft;
clk->idiv_regs = clk->cgu_regs + clock_map[sclk->id].cgu_div_oft;
return 0;
}
static ulong hsdk_cgu_get_rate(struct clk *sclk)
{
if (hsdk_prepare_clock_tree_branch(sclk))
return -EINVAL;
return clock_map[sclk->id].get_rate(sclk);
}
static ulong hsdk_cgu_set_rate(struct clk *sclk, ulong rate)
{
if (hsdk_prepare_clock_tree_branch(sclk))
return -EINVAL;
return clock_map[sclk->id].set_rate(sclk, rate);
}
static int hsdk_cgu_disable(struct clk *sclk)
{
if (hsdk_prepare_clock_tree_branch(sclk))
return -EINVAL;
if (clock_map[sclk->id].disable)
return clock_map[sclk->id].disable(sclk);
return -ENOTSUPP;
}
static const struct clk_ops hsdk_cgu_ops = {
.set_rate = hsdk_cgu_set_rate,
.get_rate = hsdk_cgu_get_rate,
.disable = hsdk_cgu_disable,
};
static int hsdk_cgu_clk_probe(struct udevice *dev)
{
struct hsdk_cgu_clk *pll_clk = dev_get_priv(dev);
BUILD_BUG_ON(ARRAY_SIZE(clock_map) != CGU_MAX_CLOCKS);
pll_clk->cgu_regs = (void __iomem *)devfdt_get_addr_index(dev, 0);
if (!pll_clk->cgu_regs)
return -EINVAL;
pll_clk->creg_regs = (void __iomem *)devfdt_get_addr_index(dev, 1);
if (!pll_clk->creg_regs)
return -EINVAL;
return 0;
}
static const struct udevice_id hsdk_cgu_clk_id[] = {
{ .compatible = "snps,hsdk-cgu-clock" },
{ }
};
U_BOOT_DRIVER(hsdk_cgu_clk) = {
.name = "hsdk-cgu-clk",
.id = UCLASS_CLK,
.of_match = hsdk_cgu_clk_id,
.probe = hsdk_cgu_clk_probe,
.platdata_auto_alloc_size = sizeof(struct hsdk_cgu_clk),
.ops = &hsdk_cgu_ops,
};
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