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u-boot/drivers/clk/clk_stm32h7.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

871 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <dm/root.h>
#include <dt-bindings/clock/stm32h7-clks.h>
/* RCC CR specific definitions */
#define RCC_CR_HSION BIT(0)
#define RCC_CR_HSIRDY BIT(2)
#define RCC_CR_HSEON BIT(16)
#define RCC_CR_HSERDY BIT(17)
#define RCC_CR_HSEBYP BIT(18)
#define RCC_CR_PLL1ON BIT(24)
#define RCC_CR_PLL1RDY BIT(25)
#define RCC_CR_HSIDIV_MASK GENMASK(4, 3)
#define RCC_CR_HSIDIV_SHIFT 3
#define RCC_CFGR_SW_MASK GENMASK(2, 0)
#define RCC_CFGR_SW_HSI 0
#define RCC_CFGR_SW_CSI 1
#define RCC_CFGR_SW_HSE 2
#define RCC_CFGR_SW_PLL1 3
#define RCC_CFGR_TIMPRE BIT(15)
#define RCC_PLLCKSELR_PLLSRC_HSI 0
#define RCC_PLLCKSELR_PLLSRC_CSI 1
#define RCC_PLLCKSELR_PLLSRC_HSE 2
#define RCC_PLLCKSELR_PLLSRC_NO_CLK 3
#define RCC_PLLCKSELR_PLLSRC_MASK GENMASK(1, 0)
#define RCC_PLLCKSELR_DIVM1_SHIFT 4
#define RCC_PLLCKSELR_DIVM1_MASK GENMASK(9, 4)
#define RCC_PLL1DIVR_DIVN1_MASK GENMASK(8, 0)
#define RCC_PLL1DIVR_DIVP1_SHIFT 9
#define RCC_PLL1DIVR_DIVP1_MASK GENMASK(15, 9)
#define RCC_PLL1DIVR_DIVQ1_SHIFT 16
#define RCC_PLL1DIVR_DIVQ1_MASK GENMASK(22, 16)
#define RCC_PLL1DIVR_DIVR1_SHIFT 24
#define RCC_PLL1DIVR_DIVR1_MASK GENMASK(30, 24)
#define RCC_PLL1FRACR_FRACN1_SHIFT 3
#define RCC_PLL1FRACR_FRACN1_MASK GENMASK(15, 3)
#define RCC_PLLCFGR_PLL1RGE_SHIFT 2
#define PLL1RGE_1_2_MHZ 0
#define PLL1RGE_2_4_MHZ 1
#define PLL1RGE_4_8_MHZ 2
#define PLL1RGE_8_16_MHZ 3
#define RCC_PLLCFGR_DIVP1EN BIT(16)
#define RCC_PLLCFGR_DIVQ1EN BIT(17)
#define RCC_PLLCFGR_DIVR1EN BIT(18)
#define RCC_D1CFGR_HPRE_MASK GENMASK(3, 0)
#define RCC_D1CFGR_HPRE_DIVIDED BIT(3)
#define RCC_D1CFGR_HPRE_DIVIDER GENMASK(2, 0)
#define RCC_D1CFGR_HPRE_DIV2 8
#define RCC_D1CFGR_D1PPRE_SHIFT 4
#define RCC_D1CFGR_D1PPRE_DIVIDED BIT(6)
#define RCC_D1CFGR_D1PPRE_DIVIDER GENMASK(5, 4)
#define RCC_D1CFGR_D1CPRE_SHIFT 8
#define RCC_D1CFGR_D1CPRE_DIVIDER GENMASK(10, 8)
#define RCC_D1CFGR_D1CPRE_DIVIDED BIT(11)
#define RCC_D2CFGR_D2PPRE1_SHIFT 4
#define RCC_D2CFGR_D2PPRE1_DIVIDED BIT(6)
#define RCC_D2CFGR_D2PPRE1_DIVIDER GENMASK(5, 4)
#define RCC_D2CFGR_D2PPRE2_SHIFT 8
#define RCC_D2CFGR_D2PPRE2_DIVIDED BIT(10)
#define RCC_D2CFGR_D2PPRE2_DIVIDER GENMASK(9, 8)
#define RCC_D3CFGR_D3PPRE_SHIFT 4
#define RCC_D3CFGR_D3PPRE_DIVIDED BIT(6)
#define RCC_D3CFGR_D3PPRE_DIVIDER GENMASK(5, 4)
#define RCC_D1CCIPR_FMCSRC_MASK GENMASK(1, 0)
#define FMCSRC_HCLKD1 0
#define FMCSRC_PLL1_Q_CK 1
#define FMCSRC_PLL2_R_CK 2
#define FMCSRC_PER_CK 3
#define RCC_D1CCIPR_QSPISRC_MASK GENMASK(5, 4)
#define RCC_D1CCIPR_QSPISRC_SHIFT 4
#define QSPISRC_HCLKD1 0
#define QSPISRC_PLL1_Q_CK 1
#define QSPISRC_PLL2_R_CK 2
#define QSPISRC_PER_CK 3
#define PWR_CR3 0x0c
#define PWR_CR3_SCUEN BIT(2)
#define PWR_D3CR 0x18
#define PWR_D3CR_VOS_MASK GENMASK(15, 14)
#define PWR_D3CR_VOS_SHIFT 14
#define VOS_SCALE_3 1
#define VOS_SCALE_2 2
#define VOS_SCALE_1 3
#define PWR_D3CR_VOSREADY BIT(13)
struct stm32_rcc_regs {
u32 cr; /* 0x00 Source Control Register */
u32 icscr; /* 0x04 Internal Clock Source Calibration Register */
u32 crrcr; /* 0x08 Clock Recovery RC Register */
u32 reserved1; /* 0x0c reserved */
u32 cfgr; /* 0x10 Clock Configuration Register */
u32 reserved2; /* 0x14 reserved */
u32 d1cfgr; /* 0x18 Domain 1 Clock Configuration Register */
u32 d2cfgr; /* 0x1c Domain 2 Clock Configuration Register */
u32 d3cfgr; /* 0x20 Domain 3 Clock Configuration Register */
u32 reserved3; /* 0x24 reserved */
u32 pllckselr; /* 0x28 PLLs Clock Source Selection Register */
u32 pllcfgr; /* 0x2c PLLs Configuration Register */
u32 pll1divr; /* 0x30 PLL1 Dividers Configuration Register */
u32 pll1fracr; /* 0x34 PLL1 Fractional Divider Register */
u32 pll2divr; /* 0x38 PLL2 Dividers Configuration Register */
u32 pll2fracr; /* 0x3c PLL2 Fractional Divider Register */
u32 pll3divr; /* 0x40 PLL3 Dividers Configuration Register */
u32 pll3fracr; /* 0x44 PLL3 Fractional Divider Register */
u32 reserved4; /* 0x48 reserved */
u32 d1ccipr; /* 0x4c Domain 1 Kernel Clock Configuration Register */
u32 d2ccip1r; /* 0x50 Domain 2 Kernel Clock Configuration Register */
u32 d2ccip2r; /* 0x54 Domain 2 Kernel Clock Configuration Register */
u32 d3ccipr; /* 0x58 Domain 3 Kernel Clock Configuration Register */
u32 reserved5; /* 0x5c reserved */
u32 cier; /* 0x60 Clock Source Interrupt Enable Register */
u32 cifr; /* 0x64 Clock Source Interrupt Flag Register */
u32 cicr; /* 0x68 Clock Source Interrupt Clear Register */
u32 reserved6; /* 0x6c reserved */
u32 bdcr; /* 0x70 Backup Domain Control Register */
u32 csr; /* 0x74 Clock Control and Status Register */
u32 reserved7; /* 0x78 reserved */
u32 ahb3rstr; /* 0x7c AHB3 Peripheral Reset Register */
u32 ahb1rstr; /* 0x80 AHB1 Peripheral Reset Register */
u32 ahb2rstr; /* 0x84 AHB2 Peripheral Reset Register */
u32 ahb4rstr; /* 0x88 AHB4 Peripheral Reset Register */
u32 apb3rstr; /* 0x8c APB3 Peripheral Reset Register */
u32 apb1lrstr; /* 0x90 APB1 low Peripheral Reset Register */
u32 apb1hrstr; /* 0x94 APB1 high Peripheral Reset Register */
u32 apb2rstr; /* 0x98 APB2 Clock Register */
u32 apb4rstr; /* 0x9c APB4 Clock Register */
u32 gcr; /* 0xa0 Global Control Register */
u32 reserved8; /* 0xa4 reserved */
u32 d3amr; /* 0xa8 D3 Autonomous mode Register */
u32 reserved9[9];/* 0xac to 0xcc reserved */
u32 rsr; /* 0xd0 Reset Status Register */
u32 ahb3enr; /* 0xd4 AHB3 Clock Register */
u32 ahb1enr; /* 0xd8 AHB1 Clock Register */
u32 ahb2enr; /* 0xdc AHB2 Clock Register */
u32 ahb4enr; /* 0xe0 AHB4 Clock Register */
u32 apb3enr; /* 0xe4 APB3 Clock Register */
u32 apb1lenr; /* 0xe8 APB1 low Clock Register */
u32 apb1henr; /* 0xec APB1 high Clock Register */
u32 apb2enr; /* 0xf0 APB2 Clock Register */
u32 apb4enr; /* 0xf4 APB4 Clock Register */
};
#define RCC_AHB3ENR offsetof(struct stm32_rcc_regs, ahb3enr)
#define RCC_AHB1ENR offsetof(struct stm32_rcc_regs, ahb1enr)
#define RCC_AHB2ENR offsetof(struct stm32_rcc_regs, ahb2enr)
#define RCC_AHB4ENR offsetof(struct stm32_rcc_regs, ahb4enr)
#define RCC_APB3ENR offsetof(struct stm32_rcc_regs, apb3enr)
#define RCC_APB1LENR offsetof(struct stm32_rcc_regs, apb1lenr)
#define RCC_APB1HENR offsetof(struct stm32_rcc_regs, apb1henr)
#define RCC_APB2ENR offsetof(struct stm32_rcc_regs, apb2enr)
#define RCC_APB4ENR offsetof(struct stm32_rcc_regs, apb4enr)
struct clk_cfg {
u32 gate_offset;
u8 gate_bit_idx;
const char *name;
};
/*
* the way all these entries are sorted in this array could seem
* unlogical, but we are dependant of kernel DT_bindings,
* where clocks are separate in 2 banks, peripheral clocks and
* kernel clocks.
*/
static const struct clk_cfg clk_map[] = {
{RCC_AHB3ENR, 31, "d1sram1"}, /* peripheral clocks */
{RCC_AHB3ENR, 30, "itcm"},
{RCC_AHB3ENR, 29, "dtcm2"},
{RCC_AHB3ENR, 28, "dtcm1"},
{RCC_AHB3ENR, 8, "flitf"},
{RCC_AHB3ENR, 5, "jpgdec"},
{RCC_AHB3ENR, 4, "dma2d"},
{RCC_AHB3ENR, 0, "mdma"},
{RCC_AHB1ENR, 28, "usb2ulpi"},
{RCC_AHB1ENR, 17, "eth1rx"},
{RCC_AHB1ENR, 16, "eth1tx"},
{RCC_AHB1ENR, 15, "eth1mac"},
{RCC_AHB1ENR, 14, "art"},
{RCC_AHB1ENR, 26, "usb1ulpi"},
{RCC_AHB1ENR, 1, "dma2"},
{RCC_AHB1ENR, 0, "dma1"},
{RCC_AHB2ENR, 31, "d2sram3"},
{RCC_AHB2ENR, 30, "d2sram2"},
{RCC_AHB2ENR, 29, "d2sram1"},
{RCC_AHB2ENR, 5, "hash"},
{RCC_AHB2ENR, 4, "crypt"},
{RCC_AHB2ENR, 0, "camitf"},
{RCC_AHB4ENR, 28, "bkpram"},
{RCC_AHB4ENR, 25, "hsem"},
{RCC_AHB4ENR, 21, "bdma"},
{RCC_AHB4ENR, 19, "crc"},
{RCC_AHB4ENR, 10, "gpiok"},
{RCC_AHB4ENR, 9, "gpioj"},
{RCC_AHB4ENR, 8, "gpioi"},
{RCC_AHB4ENR, 7, "gpioh"},
{RCC_AHB4ENR, 6, "gpiog"},
{RCC_AHB4ENR, 5, "gpiof"},
{RCC_AHB4ENR, 4, "gpioe"},
{RCC_AHB4ENR, 3, "gpiod"},
{RCC_AHB4ENR, 2, "gpioc"},
{RCC_AHB4ENR, 1, "gpiob"},
{RCC_AHB4ENR, 0, "gpioa"},
{RCC_APB3ENR, 6, "wwdg1"},
{RCC_APB1LENR, 29, "dac12"},
{RCC_APB1LENR, 11, "wwdg2"},
{RCC_APB1LENR, 8, "tim14"},
{RCC_APB1LENR, 7, "tim13"},
{RCC_APB1LENR, 6, "tim12"},
{RCC_APB1LENR, 5, "tim7"},
{RCC_APB1LENR, 4, "tim6"},
{RCC_APB1LENR, 3, "tim5"},
{RCC_APB1LENR, 2, "tim4"},
{RCC_APB1LENR, 1, "tim3"},
{RCC_APB1LENR, 0, "tim2"},
{RCC_APB1HENR, 5, "mdios"},
{RCC_APB1HENR, 4, "opamp"},
{RCC_APB1HENR, 1, "crs"},
{RCC_APB2ENR, 18, "tim17"},
{RCC_APB2ENR, 17, "tim16"},
{RCC_APB2ENR, 16, "tim15"},
{RCC_APB2ENR, 1, "tim8"},
{RCC_APB2ENR, 0, "tim1"},
{RCC_APB4ENR, 26, "tmpsens"},
{RCC_APB4ENR, 16, "rtcapb"},
{RCC_APB4ENR, 15, "vref"},
{RCC_APB4ENR, 14, "comp12"},
{RCC_APB4ENR, 1, "syscfg"},
{RCC_AHB3ENR, 16, "sdmmc1"}, /* kernel clocks */
{RCC_AHB3ENR, 14, "quadspi"},
{RCC_AHB3ENR, 12, "fmc"},
{RCC_AHB1ENR, 27, "usb2otg"},
{RCC_AHB1ENR, 25, "usb1otg"},
{RCC_AHB1ENR, 5, "adc12"},
{RCC_AHB2ENR, 9, "sdmmc2"},
{RCC_AHB2ENR, 6, "rng"},
{RCC_AHB4ENR, 24, "adc3"},
{RCC_APB3ENR, 4, "dsi"},
{RCC_APB3ENR, 3, "ltdc"},
{RCC_APB1LENR, 31, "usart8"},
{RCC_APB1LENR, 30, "usart7"},
{RCC_APB1LENR, 27, "hdmicec"},
{RCC_APB1LENR, 23, "i2c3"},
{RCC_APB1LENR, 22, "i2c2"},
{RCC_APB1LENR, 21, "i2c1"},
{RCC_APB1LENR, 20, "uart5"},
{RCC_APB1LENR, 19, "uart4"},
{RCC_APB1LENR, 18, "usart3"},
{RCC_APB1LENR, 17, "usart2"},
{RCC_APB1LENR, 16, "spdifrx"},
{RCC_APB1LENR, 15, "spi3"},
{RCC_APB1LENR, 14, "spi2"},
{RCC_APB1LENR, 9, "lptim1"},
{RCC_APB1HENR, 8, "fdcan"},
{RCC_APB1HENR, 2, "swp"},
{RCC_APB2ENR, 29, "hrtim"},
{RCC_APB2ENR, 28, "dfsdm1"},
{RCC_APB2ENR, 24, "sai3"},
{RCC_APB2ENR, 23, "sai2"},
{RCC_APB2ENR, 22, "sai1"},
{RCC_APB2ENR, 20, "spi5"},
{RCC_APB2ENR, 13, "spi4"},
{RCC_APB2ENR, 12, "spi1"},
{RCC_APB2ENR, 5, "usart6"},
{RCC_APB2ENR, 4, "usart1"},
{RCC_APB4ENR, 21, "sai4a"},
{RCC_APB4ENR, 21, "sai4b"},
{RCC_APB4ENR, 12, "lptim5"},
{RCC_APB4ENR, 11, "lptim4"},
{RCC_APB4ENR, 10, "lptim3"},
{RCC_APB4ENR, 9, "lptim2"},
{RCC_APB4ENR, 7, "i2c4"},
{RCC_APB4ENR, 5, "spi6"},
{RCC_APB4ENR, 3, "lpuart1"},
};
struct stm32_clk {
struct stm32_rcc_regs *rcc_base;
struct regmap *pwr_regmap;
};
struct pll_psc {
u8 divm;
u16 divn;
u8 divp;
u8 divq;
u8 divr;
};
/*
* OSC_HSE = 25 MHz
* VCO = 500MHz
* pll1_p = 250MHz / pll1_q = 250MHz pll1_r = 250Mhz
*/
struct pll_psc sys_pll_psc = {
.divm = 4,
.divn = 80,
.divp = 2,
.divq = 2,
.divr = 2,
};
enum apb {
APB1,
APB2,
};
int configure_clocks(struct udevice *dev)
{
struct stm32_clk *priv = dev_get_priv(dev);
struct stm32_rcc_regs *regs = priv->rcc_base;
uint8_t *pwr_base = (uint8_t *)regmap_get_range(priv->pwr_regmap, 0);
uint32_t pllckselr = 0;
uint32_t pll1divr = 0;
uint32_t pllcfgr = 0;
/* Switch on HSI */
setbits_le32(&regs->cr, RCC_CR_HSION);
while (!(readl(&regs->cr) & RCC_CR_HSIRDY))
;
/* Reset CFGR, now HSI is the default system clock */
writel(0, &regs->cfgr);
/* Set all kernel domain clock registers to reset value*/
writel(0x0, &regs->d1ccipr);
writel(0x0, &regs->d2ccip1r);
writel(0x0, &regs->d2ccip2r);
/* Set voltage scaling at scale 1 (1,15 - 1,26 Volts) */
clrsetbits_le32(pwr_base + PWR_D3CR, PWR_D3CR_VOS_MASK,
VOS_SCALE_1 << PWR_D3CR_VOS_SHIFT);
/* Lock supply configuration update */
clrbits_le32(pwr_base + PWR_CR3, PWR_CR3_SCUEN);
while (!(readl(pwr_base + PWR_D3CR) & PWR_D3CR_VOSREADY))
;
/* disable HSE to configure it */
clrbits_le32(&regs->cr, RCC_CR_HSEON);
while ((readl(&regs->cr) & RCC_CR_HSERDY))
;
/* clear HSE bypass and set it ON */
clrbits_le32(&regs->cr, RCC_CR_HSEBYP);
/* Switch on HSE */
setbits_le32(&regs->cr, RCC_CR_HSEON);
while (!(readl(&regs->cr) & RCC_CR_HSERDY))
;
/* pll setup, disable it */
clrbits_le32(&regs->cr, RCC_CR_PLL1ON);
while ((readl(&regs->cr) & RCC_CR_PLL1RDY))
;
/* Select HSE as PLL clock source */
pllckselr |= RCC_PLLCKSELR_PLLSRC_HSE;
pllckselr |= sys_pll_psc.divm << RCC_PLLCKSELR_DIVM1_SHIFT;
writel(pllckselr, &regs->pllckselr);
pll1divr |= (sys_pll_psc.divr - 1) << RCC_PLL1DIVR_DIVR1_SHIFT;
pll1divr |= (sys_pll_psc.divq - 1) << RCC_PLL1DIVR_DIVQ1_SHIFT;
pll1divr |= (sys_pll_psc.divp - 1) << RCC_PLL1DIVR_DIVP1_SHIFT;
pll1divr |= (sys_pll_psc.divn - 1);
writel(pll1divr, &regs->pll1divr);
pllcfgr |= PLL1RGE_4_8_MHZ << RCC_PLLCFGR_PLL1RGE_SHIFT;
pllcfgr |= RCC_PLLCFGR_DIVP1EN;
pllcfgr |= RCC_PLLCFGR_DIVQ1EN;
pllcfgr |= RCC_PLLCFGR_DIVR1EN;
writel(pllcfgr, &regs->pllcfgr);
/* pll setup, enable it */
setbits_le32(&regs->cr, RCC_CR_PLL1ON);
/* set HPRE (/2) DI clk --> 125MHz */
clrsetbits_le32(&regs->d1cfgr, RCC_D1CFGR_HPRE_MASK,
RCC_D1CFGR_HPRE_DIV2);
/* select PLL1 as system clock source (sys_ck)*/
clrsetbits_le32(&regs->cfgr, RCC_CFGR_SW_MASK, RCC_CFGR_SW_PLL1);
while ((readl(&regs->cfgr) & RCC_CFGR_SW_MASK) != RCC_CFGR_SW_PLL1)
;
/* sdram: use pll1_q as fmc_k clk */
clrsetbits_le32(&regs->d1ccipr, RCC_D1CCIPR_FMCSRC_MASK,
FMCSRC_PLL1_Q_CK);
return 0;
}
static u32 stm32_get_HSI_divider(struct stm32_rcc_regs *regs)
{
u32 divider;
/* get HSI divider value */
divider = readl(&regs->cr) & RCC_CR_HSIDIV_MASK;
divider = divider >> RCC_CR_HSIDIV_SHIFT;
return divider;
};
enum pllsrc {
HSE,
LSE,
HSI,
CSI,
I2S,
TIMER,
PLLSRC_NB,
};
static const char * const pllsrc_name[PLLSRC_NB] = {
[HSE] = "clk-hse",
[LSE] = "clk-lse",
[HSI] = "clk-hsi",
[CSI] = "clk-csi",
[I2S] = "clk-i2s",
[TIMER] = "timer-clk"
};
static ulong stm32_get_rate(struct stm32_rcc_regs *regs, enum pllsrc pllsrc)
{
struct clk clk;
struct udevice *fixed_clock_dev = NULL;
u32 divider;
int ret;
const char *name = pllsrc_name[pllsrc];
debug("%s name %s\n", __func__, name);
clk.id = 0;
ret = uclass_get_device_by_name(UCLASS_CLK, name, &fixed_clock_dev);
if (ret) {
pr_err("Can't find clk %s (%d)", name, ret);
return 0;
}
ret = clk_request(fixed_clock_dev, &clk);
if (ret) {
pr_err("Can't request %s clk (%d)", name, ret);
return 0;
}
divider = 0;
if (pllsrc == HSI)
divider = stm32_get_HSI_divider(regs);
debug("%s divider %d rate %ld\n", __func__,
divider, clk_get_rate(&clk));
return clk_get_rate(&clk) >> divider;
};
enum pll1_output {
PLL1_P_CK,
PLL1_Q_CK,
PLL1_R_CK,
};
static u32 stm32_get_PLL1_rate(struct stm32_rcc_regs *regs,
enum pll1_output output)
{
ulong pllsrc = 0;
u32 divm1, divn1, divp1, divq1, divr1, fracn1;
ulong vco, rate;
/* get the PLLSRC */
switch (readl(&regs->pllckselr) & RCC_PLLCKSELR_PLLSRC_MASK) {
case RCC_PLLCKSELR_PLLSRC_HSI:
pllsrc = stm32_get_rate(regs, HSI);
break;
case RCC_PLLCKSELR_PLLSRC_CSI:
pllsrc = stm32_get_rate(regs, CSI);
break;
case RCC_PLLCKSELR_PLLSRC_HSE:
pllsrc = stm32_get_rate(regs, HSE);
break;
case RCC_PLLCKSELR_PLLSRC_NO_CLK:
/* shouldn't happen */
pr_err("wrong value for RCC_PLLCKSELR register\n");
pllsrc = 0;
break;
}
/* pllsrc = 0 ? no need to go ahead */
if (!pllsrc)
return pllsrc;
/* get divm1, divp1, divn1 and divr1 */
divm1 = readl(&regs->pllckselr) & RCC_PLLCKSELR_DIVM1_MASK;
divm1 = divm1 >> RCC_PLLCKSELR_DIVM1_SHIFT;
divn1 = (readl(&regs->pll1divr) & RCC_PLL1DIVR_DIVN1_MASK) + 1;
divp1 = readl(&regs->pll1divr) & RCC_PLL1DIVR_DIVP1_MASK;
divp1 = (divp1 >> RCC_PLL1DIVR_DIVP1_SHIFT) + 1;
divq1 = readl(&regs->pll1divr) & RCC_PLL1DIVR_DIVQ1_MASK;
divq1 = (divq1 >> RCC_PLL1DIVR_DIVQ1_SHIFT) + 1;
divr1 = readl(&regs->pll1divr) & RCC_PLL1DIVR_DIVR1_MASK;
divr1 = (divr1 >> RCC_PLL1DIVR_DIVR1_SHIFT) + 1;
fracn1 = readl(&regs->pll1fracr) & RCC_PLL1DIVR_DIVR1_MASK;
fracn1 = fracn1 & RCC_PLL1DIVR_DIVR1_SHIFT;
vco = (pllsrc / divm1) * divn1;
rate = (pllsrc * fracn1) / (divm1 * 8192);
debug("%s divm1 = %d divn1 = %d divp1 = %d divq1 = %d divr1 = %d\n",
__func__, divm1, divn1, divp1, divq1, divr1);
debug("%s fracn1 = %d vco = %ld rate = %ld\n",
__func__, fracn1, vco, rate);
switch (output) {
case PLL1_P_CK:
return (vco + rate) / divp1;
break;
case PLL1_Q_CK:
return (vco + rate) / divq1;
break;
case PLL1_R_CK:
return (vco + rate) / divr1;
break;
}
return -EINVAL;
}
static u32 stm32_get_apb_psc(struct stm32_rcc_regs *regs, enum apb apb)
{
u16 prescaler_table[8] = {2, 4, 8, 16, 64, 128, 256, 512};
u32 d2cfgr = readl(&regs->d2cfgr);
if (apb == APB1) {
if (d2cfgr & RCC_D2CFGR_D2PPRE1_DIVIDED)
/* get D2 domain APB1 prescaler */
return prescaler_table[
((d2cfgr & RCC_D2CFGR_D2PPRE1_DIVIDER)
>> RCC_D2CFGR_D2PPRE1_SHIFT)];
} else { /* APB2 */
if (d2cfgr & RCC_D2CFGR_D2PPRE2_DIVIDED)
/* get D2 domain APB2 prescaler */
return prescaler_table[
((d2cfgr & RCC_D2CFGR_D2PPRE2_DIVIDER)
>> RCC_D2CFGR_D2PPRE2_SHIFT)];
}
return 1;
};
static u32 stm32_get_timer_rate(struct stm32_clk *priv, u32 sysclk,
enum apb apb)
{
struct stm32_rcc_regs *regs = priv->rcc_base;
u32 psc = stm32_get_apb_psc(regs, apb);
if (readl(&regs->cfgr) & RCC_CFGR_TIMPRE)
/*
* if APB prescaler is configured to a
* division factor of 1, 2 or 4
*/
switch (psc) {
case 1:
case 2:
case 4:
return sysclk;
case 8:
return sysclk / 2;
case 16:
return sysclk / 4;
default:
pr_err("unexpected prescaler value (%d)\n", psc);
return 0;
}
else
switch (psc) {
case 1:
return sysclk;
case 2:
case 4:
case 8:
case 16:
return sysclk / psc;
default:
pr_err("unexpected prescaler value (%d)\n", psc);
return 0;
}
};
static ulong stm32_clk_get_rate(struct clk *clk)
{
struct stm32_clk *priv = dev_get_priv(clk->dev);
struct stm32_rcc_regs *regs = priv->rcc_base;
ulong sysclk = 0;
u32 gate_offset;
u32 d1cfgr, d3cfgr;
/* prescaler table lookups for clock computation */
u16 prescaler_table[8] = {2, 4, 8, 16, 64, 128, 256, 512};
u8 source, idx;
/*
* get system clock (sys_ck) source
* can be HSI_CK, CSI_CK, HSE_CK or pll1_p_ck
*/
source = readl(&regs->cfgr) & RCC_CFGR_SW_MASK;
switch (source) {
case RCC_CFGR_SW_PLL1:
sysclk = stm32_get_PLL1_rate(regs, PLL1_P_CK);
break;
case RCC_CFGR_SW_HSE:
sysclk = stm32_get_rate(regs, HSE);
break;
case RCC_CFGR_SW_CSI:
sysclk = stm32_get_rate(regs, CSI);
break;
case RCC_CFGR_SW_HSI:
sysclk = stm32_get_rate(regs, HSI);
break;
}
/* sysclk = 0 ? no need to go ahead */
if (!sysclk)
return sysclk;
debug("%s system clock: source = %d freq = %ld\n",
__func__, source, sysclk);
d1cfgr = readl(&regs->d1cfgr);
if (d1cfgr & RCC_D1CFGR_D1CPRE_DIVIDED) {
/* get D1 domain Core prescaler */
idx = (d1cfgr & RCC_D1CFGR_D1CPRE_DIVIDER) >>
RCC_D1CFGR_D1CPRE_SHIFT;
sysclk = sysclk / prescaler_table[idx];
}
if (d1cfgr & RCC_D1CFGR_HPRE_DIVIDED) {
/* get D1 domain AHB prescaler */
idx = d1cfgr & RCC_D1CFGR_HPRE_DIVIDER;
sysclk = sysclk / prescaler_table[idx];
}
gate_offset = clk_map[clk->id].gate_offset;
debug("%s clk->id=%ld gate_offset=0x%x sysclk=%ld\n",
__func__, clk->id, gate_offset, sysclk);
switch (gate_offset) {
case RCC_AHB3ENR:
case RCC_AHB1ENR:
case RCC_AHB2ENR:
case RCC_AHB4ENR:
return sysclk;
break;
case RCC_APB3ENR:
if (d1cfgr & RCC_D1CFGR_D1PPRE_DIVIDED) {
/* get D1 domain APB3 prescaler */
idx = (d1cfgr & RCC_D1CFGR_D1PPRE_DIVIDER) >>
RCC_D1CFGR_D1PPRE_SHIFT;
sysclk = sysclk / prescaler_table[idx];
}
debug("%s system clock: freq after APB3 prescaler = %ld\n",
__func__, sysclk);
return sysclk;
break;
case RCC_APB4ENR:
d3cfgr = readl(&regs->d3cfgr);
if (d3cfgr & RCC_D3CFGR_D3PPRE_DIVIDED) {
/* get D3 domain APB4 prescaler */
idx = (d3cfgr & RCC_D3CFGR_D3PPRE_DIVIDER) >>
RCC_D3CFGR_D3PPRE_SHIFT;
sysclk = sysclk / prescaler_table[idx];
}
debug("%s system clock: freq after APB4 prescaler = %ld\n",
__func__, sysclk);
return sysclk;
break;
case RCC_APB1LENR:
case RCC_APB1HENR:
/* special case for GPT timers */
switch (clk->id) {
case TIM14_CK:
case TIM13_CK:
case TIM12_CK:
case TIM7_CK:
case TIM6_CK:
case TIM5_CK:
case TIM4_CK:
case TIM3_CK:
case TIM2_CK:
return stm32_get_timer_rate(priv, sysclk, APB1);
}
debug("%s system clock: freq after APB1 prescaler = %ld\n",
__func__, sysclk);
return (sysclk / stm32_get_apb_psc(regs, APB1));
break;
case RCC_APB2ENR:
/* special case for timers */
switch (clk->id) {
case TIM17_CK:
case TIM16_CK:
case TIM15_CK:
case TIM8_CK:
case TIM1_CK:
return stm32_get_timer_rate(priv, sysclk, APB2);
}
debug("%s system clock: freq after APB2 prescaler = %ld\n",
__func__, sysclk);
return (sysclk / stm32_get_apb_psc(regs, APB2));
break;
default:
pr_err("unexpected gate_offset value (0x%x)\n", gate_offset);
return -EINVAL;
break;
}
}
static int stm32_clk_enable(struct clk *clk)
{
struct stm32_clk *priv = dev_get_priv(clk->dev);
struct stm32_rcc_regs *regs = priv->rcc_base;
u32 gate_offset;
u32 gate_bit_index;
unsigned long clk_id = clk->id;
gate_offset = clk_map[clk_id].gate_offset;
gate_bit_index = clk_map[clk_id].gate_bit_idx;
debug("%s: clkid=%ld gate offset=0x%x bit_index=%d name=%s\n",
__func__, clk->id, gate_offset, gate_bit_index,
clk_map[clk_id].name);
setbits_le32(&regs->cr + (gate_offset / 4), BIT(gate_bit_index));
return 0;
}
static int stm32_clk_probe(struct udevice *dev)
{
struct stm32_clk *priv = dev_get_priv(dev);
struct udevice *syscon;
fdt_addr_t addr;
int err;
addr = dev_read_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->rcc_base = (struct stm32_rcc_regs *)addr;
/* get corresponding syscon phandle */
err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
"st,syscfg", &syscon);
if (err) {
pr_err("unable to find syscon device\n");
return err;
}
priv->pwr_regmap = syscon_get_regmap(syscon);
if (!priv->pwr_regmap) {
pr_err("unable to find regmap\n");
return -ENODEV;
}
configure_clocks(dev);
return 0;
}
static int stm32_clk_of_xlate(struct clk *clk,
struct ofnode_phandle_args *args)
{
if (args->args_count != 1) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
if (args->args_count) {
clk->id = args->args[0];
/*
* this computation convert DT clock index which is used to
* point into 2 separate clock arrays (peripheral and kernel
* clocks bank) (see include/dt-bindings/clock/stm32h7-clks.h)
* into index to point into only one array where peripheral
* and kernel clocks are consecutive
*/
if (clk->id >= KERN_BANK) {
clk->id -= KERN_BANK;
clk->id += LAST_PERIF_BANK - PERIF_BANK + 1;
} else {
clk->id -= PERIF_BANK;
}
} else {
clk->id = 0;
}
debug("%s clk->id %ld\n", __func__, clk->id);
return 0;
}
static struct clk_ops stm32_clk_ops = {
.of_xlate = stm32_clk_of_xlate,
.enable = stm32_clk_enable,
.get_rate = stm32_clk_get_rate,
};
U_BOOT_DRIVER(stm32h7_clk) = {
.name = "stm32h7_rcc_clock",
.id = UCLASS_CLK,
.ops = &stm32_clk_ops,
.probe = stm32_clk_probe,
.priv_auto_alloc_size = sizeof(struct stm32_clk),
.flags = DM_FLAG_PRE_RELOC,
};
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