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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 1e94b46f73cedcebbff73799203f3266c5b28d90 / . / drivers / clk / clk-hsdk-cgu.c
blob: 85074f1b86e8720b6d6778fda4a67ca441d46266 [file] [log] [blame]
/*
* 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 <log.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <asm/arcregs.h>
#include <linux/printk.h>
#include <dt-bindings/clock/snps,hsdk-cgu.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_TUN|----------->
* | |-->|CGU_TUN_IDIV_ROM|----------->
* | |-->|CGU_TUN_IDIV_PWM|----------->
* |
* | -----------
* |-->| DDR PLL |
* -----------
* |
* |---------------------------->
*
* ------------------
* | 27.00 MHz xtal |
* ------------------
* |
* | ------------
* |-->| HDMI PLL |
* ------------
* |
* |-->|CGU_HDMI_IDIV_APB|------>
*/
#define CGU_ARC_IDIV 0x080
#define CGU_TUN_IDIV_TUN 0x380
#define CGU_TUN_IDIV_ROM 0x390
#define CGU_TUN_IDIV_PWM 0x3A0
#define CGU_TUN_IDIV_TIMER 0x3B0
#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 MIN_PLL_RATE 100000000 /* 100 MHz */
#define PARENT_RATE_33 33333333 /* fixed clock - xtal */
#define PARENT_RATE_27 27000000 /* fixed clock - xtal */
#define CGU_MAX_CLOCKS 27
#define MAX_FREQ_VARIATIONS 6
struct hsdk_idiv_cfg {
const u32 oft;
const u8 val[MAX_FREQ_VARIATIONS];
};
struct hsdk_div_full_cfg {
const u32 clk_rate[MAX_FREQ_VARIATIONS];
const u32 pll_rate[MAX_FREQ_VARIATIONS];
const struct hsdk_idiv_cfg idiv[];
};
static const struct hsdk_div_full_cfg hsdk_4xd_tun_clk_cfg = {
{ 25000000, 50000000, 75000000, 100000000, 125000000, 150000000 },
{ 600000000, 600000000, 600000000, 600000000, 750000000, 600000000 }, {
{ CGU_TUN_IDIV_TUN, { 24, 12, 8, 6, 6, 4 } },
{ CGU_TUN_IDIV_ROM, { 4, 4, 4, 4, 5, 4 } },
{ CGU_TUN_IDIV_PWM, { 8, 8, 8, 8, 10, 8 } },
{ CGU_TUN_IDIV_TIMER, { 12, 12, 12, 12, 15, 12 } },
{ /* last one */ }
}
};
static const struct hsdk_div_full_cfg hsdk_tun_clk_cfg = {
{ 25000000, 50000000, 75000000, 100000000, 125000000, 150000000 },
{ 600000000, 600000000, 600000000, 600000000, 750000000, 600000000 }, {
{ CGU_TUN_IDIV_TUN, { 24, 12, 8, 6, 6, 4 } },
{ CGU_TUN_IDIV_ROM, { 4, 4, 4, 4, 5, 4 } },
{ CGU_TUN_IDIV_PWM, { 8, 8, 8, 8, 10, 8 } },
{ /* last one */ }
}
};
static const struct hsdk_div_full_cfg axi_clk_cfg = {
{ 200000000, 400000000, 600000000, 800000000 },
{ 800000000, 800000000, 600000000, 800000000 }, {
{ CGU_SYS_IDIV_APB, { 4, 4, 3, 4 } }, /* APB */
{ CGU_SYS_IDIV_AXI, { 4, 2, 1, 1 } }, /* AXI */
{ CGU_SYS_IDIV_ETH, { 2, 2, 2, 2 } }, /* ETH */
{ CGU_SYS_IDIV_USB, { 2, 2, 2, 2 } }, /* USB */
{ CGU_SYS_IDIV_SDIO, { 2, 2, 2, 2 } }, /* SDIO */
{ CGU_SYS_IDIV_HDMI, { 2, 2, 2, 2 } }, /* HDMI */
{ CGU_SYS_IDIV_GFX_CORE, { 1, 1, 1, 1 } }, /* GPU-CORE */
{ CGU_SYS_IDIV_GFX_DMA, { 2, 2, 2, 2 } }, /* GPU-DMA */
{ CGU_SYS_IDIV_GFX_CFG, { 4, 4, 3, 4 } }, /* GPU-CFG */
{ CGU_SYS_IDIV_DMAC_CORE,{ 2, 2, 2, 2 } }, /* DMAC-CORE */
{ CGU_SYS_IDIV_DMAC_CFG, { 4, 4, 3, 4 } }, /* DMAC-CFG */
{ CGU_SYS_IDIV_SDIO_REF, { 8, 8, 6, 8 } }, /* SDIO-REF */
{ CGU_SYS_IDIV_SPI_REF, { 24, 24, 18, 24 } }, /* SPI-REF */
{ CGU_SYS_IDIV_I2C_REF, { 4, 4, 3, 4 } }, /* I2C-REF */
{ CGU_SYS_IDIV_UART_REF, { 24, 24, 18, 24 } }, /* UART-REF */
{ CGU_SYS_IDIV_EBI_REF, { 16, 16, 12, 16 } }, /* EBI-REF */
{ /* last one */ }
}
};
struct hsdk_pll_cfg {
const u32 rate;
const u8 idiv;
const u8 fbdiv;
const u8 odiv;
const u8 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 },
{ 750000000, 1, 44, 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_domain {
/* PLLs registers */
void __iomem *pll_regs;
/* PLLs special registers */
void __iomem *spec_regs;
/* PLLs devdata */
const struct hsdk_pll_devdata *pll;
/* Dividers registers */
void __iomem *idiv_regs;
};
struct hsdk_cgu_clk {
const struct cgu_clk_map *map;
/* CGU block register */
void __iomem *cgu_regs;
/* CREG block register */
void __iomem *creg_regs;
/* The domain we are working with */
struct hsdk_cgu_domain curr_domain;
};
struct hsdk_pll_devdata {
const u32 parent_rate;
const struct hsdk_pll_cfg *const pll_cfg;
const int (*const 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 = {
.parent_rate = PARENT_RATE_33,
.pll_cfg = asdt_pll_cfg,
.update_rate = hsdk_pll_core_update_rate,
};
static const struct hsdk_pll_devdata sdt_pll_dat = {
.parent_rate = PARENT_RATE_33,
.pll_cfg = asdt_pll_cfg,
.update_rate = hsdk_pll_comm_update_rate,
};
static const struct hsdk_pll_devdata hdmi_pll_dat = {
.parent_rate = PARENT_RATE_27,
.pll_cfg = hdmi_pll_cfg,
.update_rate = hsdk_pll_comm_update_rate,
};
static ulong idiv_set(struct clk *, ulong);
static ulong cpu_clk_set(struct clk *, ulong);
static ulong axi_clk_set(struct clk *, ulong);
static ulong tun_hsdk_set(struct clk *, ulong);
static ulong tun_h4xd_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 cgu_clk_map {
const u32 cgu_pll_oft;
const u32 cgu_div_oft;
const struct hsdk_pll_devdata *const pll_devdata;
const ulong (*const get_rate)(struct clk *clk);
const ulong (*const set_rate)(struct clk *clk, ulong rate);
const int (*const disable)(struct clk *clk);
};
static const struct cgu_clk_map hsdk_clk_map[] = {
[CLK_ARC_PLL] = { CGU_ARC_PLL, 0, &core_pll_dat, pll_get, pll_set, NULL },
[CLK_ARC] = { CGU_ARC_PLL, CGU_ARC_IDIV, &core_pll_dat, idiv_get, cpu_clk_set, idiv_off },
[CLK_DDR_PLL] = { CGU_DDR_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
[CLK_SYS_PLL] = { CGU_SYS_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
[CLK_SYS_APB] = { CGU_SYS_PLL, CGU_SYS_IDIV_APB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_AXI] = { CGU_SYS_PLL, CGU_SYS_IDIV_AXI, &sdt_pll_dat, idiv_get, axi_clk_set, idiv_off },
[CLK_SYS_ETH] = { CGU_SYS_PLL, CGU_SYS_IDIV_ETH, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_USB] = { CGU_SYS_PLL, CGU_SYS_IDIV_USB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_SDIO] = { CGU_SYS_PLL, CGU_SYS_IDIV_SDIO, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_HDMI] = { CGU_SYS_PLL, CGU_SYS_IDIV_HDMI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_GFX_CORE] = { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_GFX_DMA] = { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_DMA, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_GFX_CFG] = { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_DMAC_CORE] = { CGU_SYS_PLL, CGU_SYS_IDIV_DMAC_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_DMAC_CFG] = { CGU_SYS_PLL, CGU_SYS_IDIV_DMAC_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_SDIO_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_SDIO_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_SPI_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_SPI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_I2C_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_I2C_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_UART_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_UART_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_EBI_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_EBI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_TUN_PLL] = { CGU_TUN_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
[CLK_TUN_TUN] = { CGU_TUN_PLL, CGU_TUN_IDIV_TUN, &sdt_pll_dat, idiv_get, tun_hsdk_set, idiv_off },
[CLK_TUN_ROM] = { CGU_TUN_PLL, CGU_TUN_IDIV_ROM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_TUN_PWM] = { CGU_TUN_PLL, CGU_TUN_IDIV_PWM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_TUN_TIMER] = { /* missing in HSDK */ },
[CLK_HDMI_PLL] = { CGU_HDMI_PLL, 0, &hdmi_pll_dat, pll_get, pll_set, NULL },
[CLK_HDMI] = { CGU_HDMI_PLL, CGU_HDMI_IDIV_APB, &hdmi_pll_dat, idiv_get, idiv_set, idiv_off }
};
static const struct cgu_clk_map hsdk_4xd_clk_map[] = {
[CLK_ARC_PLL] = { CGU_ARC_PLL, 0, &core_pll_dat, pll_get, pll_set, NULL },
[CLK_ARC] = { CGU_ARC_PLL, CGU_ARC_IDIV, &core_pll_dat, idiv_get, cpu_clk_set, idiv_off },
[CLK_DDR_PLL] = { CGU_DDR_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
[CLK_SYS_PLL] = { CGU_SYS_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
[CLK_SYS_APB] = { CGU_SYS_PLL, CGU_SYS_IDIV_APB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_AXI] = { CGU_SYS_PLL, CGU_SYS_IDIV_AXI, &sdt_pll_dat, idiv_get, axi_clk_set, idiv_off },
[CLK_SYS_ETH] = { CGU_SYS_PLL, CGU_SYS_IDIV_ETH, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_USB] = { CGU_SYS_PLL, CGU_SYS_IDIV_USB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_SDIO] = { CGU_SYS_PLL, CGU_SYS_IDIV_SDIO, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_HDMI] = { CGU_SYS_PLL, CGU_SYS_IDIV_HDMI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_GFX_CORE] = { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_GFX_DMA] = { /* missing in HSDK-4xD */ },
[CLK_SYS_GFX_CFG] = { /* missing in HSDK-4xD */ },
[CLK_SYS_DMAC_CORE] = { CGU_SYS_PLL, CGU_SYS_IDIV_DMAC_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_DMAC_CFG] = { CGU_SYS_PLL, CGU_SYS_IDIV_DMAC_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_SDIO_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_SDIO_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_SPI_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_SPI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_I2C_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_I2C_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_UART_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_UART_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_SYS_EBI_REF] = { CGU_SYS_PLL, CGU_SYS_IDIV_EBI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_TUN_PLL] = { CGU_TUN_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
[CLK_TUN_TUN] = { CGU_TUN_PLL, CGU_TUN_IDIV_TUN, &sdt_pll_dat, idiv_get, tun_h4xd_set, idiv_off },
[CLK_TUN_ROM] = { CGU_TUN_PLL, CGU_TUN_IDIV_ROM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_TUN_PWM] = { CGU_TUN_PLL, CGU_TUN_IDIV_PWM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_TUN_TIMER] = { CGU_TUN_PLL, CGU_TUN_IDIV_TIMER, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
[CLK_HDMI_PLL] = { CGU_HDMI_PLL, 0, &hdmi_pll_dat, pll_get, pll_set, NULL },
[CLK_HDMI] = { CGU_HDMI_PLL, 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->curr_domain.idiv_regs);
}
static inline u32 hsdk_idiv_read(struct hsdk_cgu_clk *clk)
{
return ioread32(clk->curr_domain.idiv_regs);
}
static inline void hsdk_pll_write(struct hsdk_cgu_clk *clk, u32 reg, u32 val)
{
iowrite32(val, clk->curr_domain.pll_regs + reg);
}
static inline u32 hsdk_pll_read(struct hsdk_cgu_clk *clk, u32 reg)
{
return ioread32(clk->curr_domain.pll_regs + reg);
}
static inline void hsdk_pll_spcwrite(struct hsdk_cgu_clk *clk, u32 reg, u32 val)
{
iowrite32(val, clk->curr_domain.spec_regs + reg);
}
static inline u32 hsdk_pll_spcread(struct hsdk_cgu_clk *clk, u32 reg)
{
return ioread32(clk->curr_domain.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 |= (u32)cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT;
val |= (u32)cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT;
val |= (u32)cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT;
val |= (u32)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);
u32 parent_rate = clk->curr_domain.pll->parent_rate;
val = hsdk_pll_read(clk, CGU_PLL_CTRL);
pr_debug("current configurarion: %#x\n", val);
/* Check if PLL is bypassed */
if (val & CGU_PLL_CTRL_BYPASS)
return parent_rate;
/* Check if PLL is disabled */
if (val & CGU_PLL_CTRL_PD)
return 0;
/* 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->curr_domain.pll->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_devdata *pll = clk->curr_domain.pll;
const struct hsdk_pll_cfg *pll_cfg = pll->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 pll->update_rate(clk, best_rate, &pll_cfg[i]);
pr_err("invalid rate=%ld Hz, parent_rate=%d Hz\n", best_rate,
pll->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;
}
/* Special behavior: wen we set this clock we set both idiv and pll */
static ulong cpu_clk_set(struct clk *sclk, ulong rate)
{
ulong ret;
ret = pll_set(sclk, rate);
idiv_set(sclk, rate);
return ret;
}
/*
* Special behavior:
* when we set these clocks we set both PLL and all idiv dividers related to
* this PLL domain.
*/
static ulong common_div_clk_set(struct clk *sclk, ulong rate,
const struct hsdk_div_full_cfg *cfg)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
ulong pll_rate;
int i, freq_idx = -1;
ulong ret = 0;
pll_rate = pll_get(sclk);
for (i = 0; i < MAX_FREQ_VARIATIONS; i++) {
/* unused freq variations are filled with 0 */
if (!cfg->clk_rate[i])
break;
if (cfg->clk_rate[i] == rate) {
freq_idx = i;
break;
}
}
if (freq_idx < 0) {
pr_err("clk: invalid rate=%ld Hz\n", rate);
return -EINVAL;
}
/* configure PLL before dividers */
if (cfg->pll_rate[freq_idx] < pll_rate)
ret = pll_set(sclk, cfg->pll_rate[freq_idx]);
/* configure SYS dividers */
for (i = 0; cfg->idiv[i].oft != 0; i++) {
clk->curr_domain.idiv_regs = clk->cgu_regs + cfg->idiv[i].oft;
hsdk_idiv_write(clk, cfg->idiv[i].val[freq_idx]);
}
/* configure PLL after dividers */
if (cfg->pll_rate[freq_idx] >= pll_rate)
ret = pll_set(sclk, cfg->pll_rate[freq_idx]);
return ret;
}
static ulong axi_clk_set(struct clk *sclk, ulong rate)
{
return common_div_clk_set(sclk, rate, &axi_clk_cfg);
}
static ulong tun_hsdk_set(struct clk *sclk, ulong rate)
{
return common_div_clk_set(sclk, rate, &hsdk_tun_clk_cfg);
}
static ulong tun_h4xd_set(struct clk *sclk, ulong rate)
{
return common_div_clk_set(sclk, rate, &hsdk_4xd_tun_clk_cfg);
}
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 Hz, parent_rate=%ld Hz, 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 Hz, parent_rate=%ld Hz, 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;
/* clocks missing in current map have their entry zeroed */
if (!clk->map[sclk->id].pll_devdata)
return -EINVAL;
clk->curr_domain.pll = clk->map[sclk->id].pll_devdata;
clk->curr_domain.pll_regs = clk->cgu_regs + clk->map[sclk->id].cgu_pll_oft;
clk->curr_domain.spec_regs = clk->creg_regs;
clk->curr_domain.idiv_regs = clk->cgu_regs + clk->map[sclk->id].cgu_div_oft;
return 0;
}
static ulong hsdk_cgu_get_rate(struct clk *sclk)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
if (hsdk_prepare_clock_tree_branch(sclk))
return -EINVAL;
return clk->map[sclk->id].get_rate(sclk);
}
static ulong hsdk_cgu_set_rate(struct clk *sclk, ulong rate)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
if (hsdk_prepare_clock_tree_branch(sclk))
return -EINVAL;
if (clk->map[sclk->id].set_rate)
return clk->map[sclk->id].set_rate(sclk, rate);
return -EINVAL;
}
static int hsdk_cgu_disable(struct clk *sclk)
{
struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
if (hsdk_prepare_clock_tree_branch(sclk))
return -EINVAL;
if (clk->map[sclk->id].disable)
return clk->map[sclk->id].disable(sclk);
return -EINVAL;
}
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 *hsdk_clk = dev_get_priv(dev);
BUILD_BUG_ON(ARRAY_SIZE(hsdk_clk_map) != CGU_MAX_CLOCKS);
BUILD_BUG_ON(ARRAY_SIZE(hsdk_4xd_clk_map) != CGU_MAX_CLOCKS);
/* Choose which clock map to use in runtime */
if ((read_aux_reg(ARC_AUX_IDENTITY) & 0xFF) == 0x52)
hsdk_clk->map = hsdk_clk_map;
else
hsdk_clk->map = hsdk_4xd_clk_map;
hsdk_clk->cgu_regs = devfdt_get_addr_index_ptr(dev, 0);
if (!hsdk_clk->cgu_regs)
return -EINVAL;
hsdk_clk->creg_regs = devfdt_get_addr_index_ptr(dev, 1);
if (!hsdk_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,
.priv_auto = sizeof(struct hsdk_cgu_clk),
.ops = &hsdk_cgu_ops,
};