add binding and code for clock tree initialization from device tree
Signed-off-by: Patrick Delaunay patrick.delaunay@st.com ---
Changes in v2: None
doc/device-tree-bindings/clock/st,stm32mp1.txt | 226 ++++++++++ drivers/clk/clk_stm32mp1.c | 576 +++++++++++++++++++++++++ include/dt-bindings/clock/stm32mp1-clksrc.h | 284 ++++++++++++ 3 files changed, 1086 insertions(+) create mode 100644 doc/device-tree-bindings/clock/st,stm32mp1.txt create mode 100644 include/dt-bindings/clock/stm32mp1-clksrc.h
diff --git a/doc/device-tree-bindings/clock/st,stm32mp1.txt b/doc/device-tree-bindings/clock/st,stm32mp1.txt new file mode 100644 index 0000000..c29d90f --- /dev/null +++ b/doc/device-tree-bindings/clock/st,stm32mp1.txt @@ -0,0 +1,226 @@ +STMicroelectronics STM32MP1 clock tree initialization +===================================================== + +The STM32MP clock tree initialization is based on device tree information +for RCC IP and on fixed clocks. + +------------------------------- +RCC CLOCK = st,stm32mp1-rcc-clk +------------------------------- + +The RCC IP is both a reset and a clock controller but this documentation only +describes the fields added for clock tree initialization which are not present +in Linux binding. + +Please refer to ../mfd/st,stm32-rcc.txt for all the other properties common +with Linux. + +Required properties: + +- compatible: Should be "st,stm32mp1-rcc-clk" + +- st,clksrc : The clock source in this order + + for STM32MP15x: 9 clock sources are requested + MPU AXI MCU PLL12 PLL3 PLL4 RTC MCO1 MCO2 + + with value equals to RCC clock specifier as defined in + dt-bindings/clock/stm32mp1-clksrc.h: CLK_<NAME>_<SOURCE> + +- st,clkdiv : The div parameters in this order + for STM32MP15x: 11 dividers value are requested + MPU AXI MCU APB1 APB2 APB3 APB4 APB5 RTC MCO1 MCO2 + + with DIV coding defined in RCC associated register RCC_xxxDIVR + + most the case, it is: + 0x0: not divided + 0x1: division by 2 + 0x2: division by 4 + 0x3: division by 8 + ... + + but for RTC MCO1 MCO2, the coding is different: + 0x0: not divided + 0x1: division by 2 + 0x2: division by 3 + 0x3: division by 4 + ... + +Optional Properties: +- st,pll + PLL children node for PLL1 to PLL4 : (see ref manual for details) + with associated index 0 to 3 (st,pll@0 to st,pll@4) + PLLx is off when the associated node is absent + + - Sub-nodes: + + - cfg: The parameters for PLL configuration in this order: + DIVM DIVN DIVP DIVQ DIVR Output + + with DIV value as defined in RCC spec: + 0x0: bypass (division by 1) + 0x1: division by 2 + 0x2: division by 3 + 0x3: division by 4 + ... + + and Output = bitfield for each output value = 1:ON/0:OFF + BIT(0) => output P : DIVPEN + BIT(1) => output Q : DIVQEN + BIT(2) => output R : DIVREN + NB : macro PQR(p,q,r) can be used to build this value + with p,p,r = 0 or 1 + + - frac : Fractional part of the multiplication factor + (optional, PLL is in integer mode when absent) + + - csg : Clock Spreading Generator (optional) + with parameters in this order: + MOD_PER INC_STEP SSCG_MODE + + * MOD_PER: Modulation Period Adjustment + * INC_STEP: Modulation Depth Adjustment + * SSCG_MODE: Spread spectrum clock generator mode + you can use associated defines from stm32mp1-clksrc.h + * SSCG_MODE_CENTER_SPREAD = 0 + * SSCG_MODE_DOWN_SPREAD = 1 + + +- st,pkcs : used to configure the peripherals kernel clock selection + containing a list of peripheral kernel clock source identifier as defined + in the file dt-bindings/clock/stm32mp1-clksrc.h + + Example: + + rcc: rcc@50000000 { + compatible = "syscon", "simple-mfd"; + + reg = <0x50000000 0x1000>; + + rcc_clk: rcc-clk@50000000 { + #clock-cells = <1>; + compatible = "st,stm32mp1-rcc-clk"; + + st,clksrc = < CLK_MPU_PLL1P + CLK_AXI_PLL2P + CLK_MCU_HSI + CLK_PLL12_HSE + CLK_PLL3_HSE + CLK_PLL4_HSE + CLK_RTC_HSE + CLK_MCO1_DISABLED + CLK_MCO2_DISABLED + >; + + st,clkdiv = < + 1 /*MPU*/ + 0 /*AXI*/ + 0 /*MCU*/ + 1 /*APB1*/ + 1 /*APB2*/ + 1 /*APB3*/ + 1 /*APB4*/ + 5 /*APB5*/ + 23 /*RTC*/ + 0 /*MCO1*/ + 0 /*MCO2*/ + >; + + st,pll@0 { + cfg = < 1 53 0 0 0 1 >; + frac = < 0x810 >; + }; + st,pll@1 { + cfg = < 1 43 1 0 0 PQR(0,1,1)>; + csg = <10 20 1>; + }; + st,pll@2 { + cfg = < 2 85 3 13 3 0>; + csg = <10 20 SSCG_MODE_CENTER_SPREAD>; + }; + st,pll@3 { + cfg = < 2 78 4 7 9 3>; + }; + st,pkcs = < + CLK_STGEN_HSE + CLK_CKPER_HSI + CLK_USBPHY_PLL2P + CLK_DSI_PLL2Q + >; + }; + }; + +-------------------------- +other clocks = fixed-clock +-------------------------- +The clock tree is also based on 5 fixed-clock in clocks node +used to define the state of associated ST32MP1 oscillators: +- clk-lsi +- clk-lse +- clk-hsi +- clk-hse +- clk-csi + +At boot the clock tree initialization will +- enable the oscillator present in device tree +- disable HSI oscillator if the node is absent (always activated by bootrom) + +Optional properties : + +a) for external oscillator: "clk-lse", "clk-hse" + + 3 optional fields are managed + - "st,bypass" Configure the oscillator bypass mode (HSEBYP, LSEBYP) + - "st,css" Activate the clock security system (HSECSSON, LSECSSON) + - "st,drive" (only for LSE) value of the drive for the oscillator + (see LSEDRV_ define in the file dt-bindings/clock/stm32mp1-clksrc.h) + + Example board file: + + / { + clocks { + clk_hse: clk-hse { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <64000000>; + st,bypass; + }; + + clk_lse: clk-lse { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <32768>; + st,css; + st,drive = <LSEDRV_LOWEST>; + }; + }; + +b) for internal oscillator: "clk-hsi" + + internally HSI clock is fixed to 64MHz for STM32MP157 soc + in device tree clk-hsi is the clock after HSIDIV (ck_hsi in RCC doc) + So this clock frequency is used to compute the expected HSI_DIV + for the clock tree initialisation + + ex: for HSIDIV = /1 + + / { + clocks { + clk_hsi: clk-hsi { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <64000000>; + }; + }; + + ex: for HSIDIV = /2 + + / { + clocks { + clk_hsi: clk-hsi { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <32000000>; + }; + }; diff --git a/drivers/clk/clk_stm32mp1.c b/drivers/clk/clk_stm32mp1.c index 0ea2035..55b0f79 100644 --- a/drivers/clk/clk_stm32mp1.c +++ b/drivers/clk/clk_stm32mp1.c @@ -12,10 +12,21 @@ #include <spl.h> #include <syscon.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <dt-bindings/clock/stm32mp1-clks.h> +#include <dt-bindings/clock/stm32mp1-clksrc.h> + +#if !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD) +/* activate clock tree initialization in the driver */ +#define STM32MP1_CLOCK_TREE_INIT +#endif
#define MAX_HSI_HZ 64000000
+/* TIMEOUT */ +#define TIMEOUT_200MS 200000 +#define TIMEOUT_1S 1000000 + /* RCC registers */ #define RCC_OCENSETR 0x0C #define RCC_OCENCLRR 0x10 @@ -1079,6 +1090,565 @@ static ulong stm32mp1_clk_get_rate(struct clk *clk) return rate; }
+#ifdef STM32MP1_CLOCK_TREE_INIT +static void stm32mp1_ls_osc_set(int enable, fdt_addr_t rcc, u32 offset, + u32 mask_on) +{ + u32 address = rcc + offset; + + if (enable) + setbits_le32(address, mask_on); + else + clrbits_le32(address, mask_on); +} + +static void stm32mp1_hs_ocs_set(int enable, fdt_addr_t rcc, u32 mask_on) +{ + if (enable) + setbits_le32(rcc + RCC_OCENSETR, mask_on); + else + setbits_le32(rcc + RCC_OCENCLRR, mask_on); +} + +static int stm32mp1_osc_wait(int enable, fdt_addr_t rcc, u32 offset, + u32 mask_rdy) +{ + u32 mask_test = 0; + u32 address = rcc + offset; + u32 val; + int ret; + + if (enable) + mask_test = mask_rdy; + + ret = readl_poll_timeout(address, val, + (val & mask_rdy) == mask_test, + TIMEOUT_1S); + + if (ret) + pr_err("OSC %x @ %x timeout for enable=%d : 0x%x\n", + mask_rdy, address, enable, readl(address)); + + return ret; +} + +static void stm32mp1_lse_enable(fdt_addr_t rcc, int bypass, int lsedrv) +{ + u32 value; + + if (bypass) + setbits_le32(rcc + RCC_BDCR, RCC_BDCR_LSEBYP); + + /* + * warning: not recommended to switch directly from "high drive" + * to "medium low drive", and vice-versa. + */ + value = (readl(rcc + RCC_BDCR) & RCC_BDCR_LSEDRV_MASK) + >> RCC_BDCR_LSEDRV_SHIFT; + + while (value != lsedrv) { + if (value > lsedrv) + value--; + else + value++; + + clrsetbits_le32(rcc + RCC_BDCR, + RCC_BDCR_LSEDRV_MASK, + value << RCC_BDCR_LSEDRV_SHIFT); + } + + stm32mp1_ls_osc_set(1, rcc, RCC_BDCR, RCC_BDCR_LSEON); +} + +static void stm32mp1_lse_wait(fdt_addr_t rcc) +{ + stm32mp1_osc_wait(1, rcc, RCC_BDCR, RCC_BDCR_LSERDY); +} + +static void stm32mp1_lsi_set(fdt_addr_t rcc, int enable) +{ + stm32mp1_ls_osc_set(enable, rcc, RCC_RDLSICR, RCC_RDLSICR_LSION); + stm32mp1_osc_wait(enable, rcc, RCC_RDLSICR, RCC_RDLSICR_LSIRDY); +} + +static void stm32mp1_hse_enable(fdt_addr_t rcc, int bypass, int css) +{ + if (bypass) + setbits_le32(rcc + RCC_OCENSETR, RCC_OCENR_HSEBYP); + + stm32mp1_hs_ocs_set(1, rcc, RCC_OCENR_HSEON); + stm32mp1_osc_wait(1, rcc, RCC_OCRDYR, RCC_OCRDYR_HSERDY); + + if (css) + setbits_le32(rcc + RCC_OCENSETR, RCC_OCENR_HSECSSON); +} + +static void stm32mp1_csi_set(fdt_addr_t rcc, int enable) +{ + stm32mp1_ls_osc_set(enable, rcc, RCC_OCENSETR, RCC_OCENR_CSION); + stm32mp1_osc_wait(enable, rcc, RCC_OCRDYR, RCC_OCRDYR_CSIRDY); +} + +static void stm32mp1_hsi_set(fdt_addr_t rcc, int enable) +{ + stm32mp1_hs_ocs_set(enable, rcc, RCC_OCENR_HSION); + stm32mp1_osc_wait(enable, rcc, RCC_OCRDYR, RCC_OCRDYR_HSIRDY); +} + +static int stm32mp1_set_hsidiv(fdt_addr_t rcc, u8 hsidiv) +{ + u32 address = rcc + RCC_OCRDYR; + u32 val; + int ret; + + clrsetbits_le32(rcc + RCC_HSICFGR, + RCC_HSICFGR_HSIDIV_MASK, + RCC_HSICFGR_HSIDIV_MASK & hsidiv); + + ret = readl_poll_timeout(address, val, + val & RCC_OCRDYR_HSIDIVRDY, + TIMEOUT_200MS); + if (ret) + pr_err("HSIDIV failed @ 0x%x: 0x%x\n", + address, readl(address)); + + return ret; +} + +static int stm32mp1_hsidiv(fdt_addr_t rcc, ulong hsifreq) +{ + u8 hsidiv; + u32 hsidivfreq = MAX_HSI_HZ; + + for (hsidiv = 0; hsidiv < 4; hsidiv++, + hsidivfreq = hsidivfreq / 2) + if (hsidivfreq == hsifreq) + break; + + if (hsidiv == 4) { + pr_err("clk-hsi frequency invalid"); + return -1; + } + + if (hsidiv > 0) + return stm32mp1_set_hsidiv(rcc, hsidiv); + + return 0; +} + +static void pll_start(struct stm32mp1_clk_priv *priv, int pll_id) +{ + const struct stm32mp1_clk_pll *pll = priv->data->pll; + + writel(RCC_PLLNCR_PLLON, priv->base + pll[pll_id].pllxcr); +} + +static int pll_output(struct stm32mp1_clk_priv *priv, int pll_id, int output) +{ + const struct stm32mp1_clk_pll *pll = priv->data->pll; + u32 pllxcr = priv->base + pll[pll_id].pllxcr; + u32 val; + int ret; + + ret = readl_poll_timeout(pllxcr, val, val & RCC_PLLNCR_PLLRDY, + TIMEOUT_200MS); + + if (ret) { + pr_err("PLL%d start failed @ 0x%x: 0x%x\n", + pll_id, pllxcr, readl(pllxcr)); + return ret; + } + + /* start the requested output */ + setbits_le32(pllxcr, output << RCC_PLLNCR_DIVEN_SHIFT); + + return 0; +} + +static int pll_stop(struct stm32mp1_clk_priv *priv, int pll_id) +{ + const struct stm32mp1_clk_pll *pll = priv->data->pll; + u32 pllxcr = priv->base + pll[pll_id].pllxcr; + u32 val; + + /* stop all output */ + clrbits_le32(pllxcr, + RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | RCC_PLLNCR_DIVREN); + + /* stop PLL */ + clrbits_le32(pllxcr, RCC_PLLNCR_PLLON); + + /* wait PLL stopped */ + return readl_poll_timeout(pllxcr, val, (val & RCC_PLLNCR_PLLRDY) == 0, + TIMEOUT_200MS); +} + +static void pll_config_output(struct stm32mp1_clk_priv *priv, + int pll_id, u32 *pllcfg) +{ + const struct stm32mp1_clk_pll *pll = priv->data->pll; + fdt_addr_t rcc = priv->base; + u32 value; + + value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT) + & RCC_PLLNCFGR2_DIVP_MASK; + value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT) + & RCC_PLLNCFGR2_DIVQ_MASK; + value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT) + & RCC_PLLNCFGR2_DIVR_MASK; + writel(value, rcc + pll[pll_id].pllxcfgr2); +} + +static int pll_config(struct stm32mp1_clk_priv *priv, int pll_id, + u32 *pllcfg, u32 fracv) +{ + const struct stm32mp1_clk_pll *pll = priv->data->pll; + fdt_addr_t rcc = priv->base; + enum stm32mp1_plltype type = pll[pll_id].plltype; + int src; + ulong refclk; + u8 ifrge = 0; + u32 value; + + src = readl(priv->base + pll[pll_id].rckxselr) & RCC_SELR_SRC_MASK; + + refclk = stm32mp1_clk_get_fixed(priv, pll[pll_id].refclk[src]) / + (pllcfg[PLLCFG_M] + 1); + + if (refclk < (stm32mp1_pll[type].refclk_min * 1000000) || + refclk > (stm32mp1_pll[type].refclk_max * 1000000)) { + debug("invalid refclk = %x\n", (u32)refclk); + return -EINVAL; + } + if (type == PLL_800 && refclk >= 8000000) + ifrge = 1; + + value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT) + & RCC_PLLNCFGR1_DIVN_MASK; + value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT) + & RCC_PLLNCFGR1_DIVM_MASK; + value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT) + & RCC_PLLNCFGR1_IFRGE_MASK; + writel(value, rcc + pll[pll_id].pllxcfgr1); + + /* fractional configuration: load sigma-delta modulator (SDM) */ + + /* Write into FRACV the new fractional value , and FRACLE to 0 */ + writel(fracv << RCC_PLLNFRACR_FRACV_SHIFT, + rcc + pll[pll_id].pllxfracr); + + /* Write FRACLE to 1 : FRACV value is loaded into the SDM */ + setbits_le32(rcc + pll[pll_id].pllxfracr, + RCC_PLLNFRACR_FRACLE); + + pll_config_output(priv, pll_id, pllcfg); + + return 0; +} + +static void pll_csg(struct stm32mp1_clk_priv *priv, int pll_id, u32 *csg) +{ + const struct stm32mp1_clk_pll *pll = priv->data->pll; + u32 pllxcsg; + + pllxcsg = ((csg[PLLCSG_MOD_PER] << RCC_PLLNCSGR_MOD_PER_SHIFT) & + RCC_PLLNCSGR_MOD_PER_MASK) | + ((csg[PLLCSG_INC_STEP] << RCC_PLLNCSGR_INC_STEP_SHIFT) & + RCC_PLLNCSGR_INC_STEP_MASK) | + ((csg[PLLCSG_SSCG_MODE] << RCC_PLLNCSGR_SSCG_MODE_SHIFT) & + RCC_PLLNCSGR_SSCG_MODE_MASK); + + writel(pllxcsg, priv->base + pll[pll_id].pllxcsgr); +} + +static int set_clksrc(struct stm32mp1_clk_priv *priv, unsigned int clksrc) +{ + u32 address = priv->base + (clksrc >> 4); + u32 val; + int ret; + + clrsetbits_le32(address, RCC_SELR_SRC_MASK, clksrc & RCC_SELR_SRC_MASK); + ret = readl_poll_timeout(address, val, val & RCC_SELR_SRCRDY, + TIMEOUT_200MS); + if (ret) + pr_err("CLKSRC %x start failed @ 0x%x: 0x%x\n", + clksrc, address, readl(address)); + + return ret; +} + +static int set_clkdiv(unsigned int clkdiv, u32 address) +{ + u32 val; + int ret; + + clrsetbits_le32(address, RCC_DIVR_DIV_MASK, clkdiv & RCC_DIVR_DIV_MASK); + ret = readl_poll_timeout(address, val, val & RCC_DIVR_DIVRDY, + TIMEOUT_200MS); + if (ret) + pr_err("CLKDIV %x start failed @ 0x%x: 0x%x\n", + clkdiv, address, readl(address)); + + return ret; +} + +static void stm32mp1_mco_csg(struct stm32mp1_clk_priv *priv, + u32 clksrc, u32 clkdiv) +{ + u32 address = priv->base + (clksrc >> 4); + + /* + * binding clksrc : bit15-4 offset + * bit3: disable + * bit2-0: MCOSEL[2:0] + */ + if (clksrc & 0x8) { + clrbits_le32(address, RCC_MCOCFG_MCOON); + } else { + clrsetbits_le32(address, + RCC_MCOCFG_MCOSRC_MASK, + clksrc & RCC_MCOCFG_MCOSRC_MASK); + clrsetbits_le32(address, + RCC_MCOCFG_MCODIV_MASK, + clkdiv << RCC_MCOCFG_MCODIV_SHIFT); + setbits_le32(address, RCC_MCOCFG_MCOON); + } +} + +static void set_rtcsrc(struct stm32mp1_clk_priv *priv, + unsigned int clksrc, + int lse_css) +{ + u32 address = priv->base + RCC_BDCR; + + if (readl(address) & RCC_BDCR_RTCCKEN) + goto skip_rtc; + + if (clksrc == CLK_RTC_DISABLED) + goto skip_rtc; + + clrsetbits_le32(address, + RCC_BDCR_RTCSRC_MASK, + clksrc << RCC_BDCR_RTCSRC_SHIFT); + + setbits_le32(address, RCC_BDCR_RTCCKEN); + +skip_rtc: + if (lse_css) + setbits_le32(address, RCC_BDCR_LSECSSON); +} + +static void pkcs_config(struct stm32mp1_clk_priv *priv, u32 pkcs) +{ + u32 address = priv->base + ((pkcs >> 4) & 0xFFF); + u32 value = pkcs & 0xF; + u32 mask = 0xF; + + if (pkcs & BIT(31)) { + mask <<= 4; + value <<= 4; + } + clrsetbits_le32(address, mask, value); +} + +static int stm32mp1_clktree(struct udevice *dev) +{ + struct stm32mp1_clk_priv *priv = dev_get_priv(dev); + fdt_addr_t rcc = priv->base; + unsigned int clksrc[CLKSRC_NB]; + unsigned int clkdiv[CLKDIV_NB]; + unsigned int pllcfg[_PLL_NB][PLLCFG_NB]; + ofnode plloff[_PLL_NB]; + int ret; + int i, len; + int lse_css = 0; + const u32 *pkcs_cell; + + /* check mandatory field */ + ret = dev_read_u32_array(dev, "st,clksrc", clksrc, CLKSRC_NB); + if (ret < 0) { + debug("field st,clksrc invalid: error %d\n", ret); + return -FDT_ERR_NOTFOUND; + } + + ret = dev_read_u32_array(dev, "st,clkdiv", clkdiv, CLKDIV_NB); + if (ret < 0) { + debug("field st,clkdiv invalid: error %d\n", ret); + return -FDT_ERR_NOTFOUND; + } + + /* check mandatory field in each pll */ + for (i = 0; i < _PLL_NB; i++) { + char name[12]; + + sprintf(name, "st,pll@%d", i); + plloff[i] = dev_read_subnode(dev, name); + if (!ofnode_valid(plloff[i])) + continue; + ret = ofnode_read_u32_array(plloff[i], "cfg", + pllcfg[i], PLLCFG_NB); + if (ret < 0) { + debug("field cfg invalid: error %d\n", ret); + return -FDT_ERR_NOTFOUND; + } + } + + debug("configuration MCO\n"); + stm32mp1_mco_csg(priv, clksrc[CLKSRC_MCO1], clkdiv[CLKDIV_MCO1]); + stm32mp1_mco_csg(priv, clksrc[CLKSRC_MCO2], clkdiv[CLKDIV_MCO2]); + + debug("switch ON osillator\n"); + /* + * switch ON oscillator found in device-tree, + * HSI already ON after bootrom + */ + if (priv->osc[_LSI]) + stm32mp1_lsi_set(rcc, 1); + + if (priv->osc[_LSE]) { + int bypass; + int lsedrv; + struct udevice *dev = priv->osc_dev[_LSE]; + + bypass = dev_read_bool(dev, "st,bypass"); + lse_css = dev_read_bool(dev, "st,css"); + lsedrv = dev_read_u32_default(dev, "st,drive", + LSEDRV_MEDIUM_HIGH); + + stm32mp1_lse_enable(rcc, bypass, lsedrv); + } + + if (priv->osc[_HSE]) { + int bypass, css; + struct udevice *dev = priv->osc_dev[_HSE]; + + bypass = dev_read_bool(dev, "st,bypass"); + css = dev_read_bool(dev, "st,css"); + + stm32mp1_hse_enable(rcc, bypass, css); + } + /* CSI is mandatory for automatic I/O compensation (SYSCFG_CMPCR) + * => switch on CSI even if node is not present in device tree + */ + stm32mp1_csi_set(rcc, 1); + + /* come back to HSI */ + debug("come back to HSI\n"); + set_clksrc(priv, CLK_MPU_HSI); + set_clksrc(priv, CLK_AXI_HSI); + set_clksrc(priv, CLK_MCU_HSI); + + debug("pll stop\n"); + for (i = 0; i < _PLL_NB; i++) + pll_stop(priv, i); + + /* configure HSIDIV */ + debug("configure HSIDIV\n"); + if (priv->osc[_HSI]) + stm32mp1_hsidiv(rcc, priv->osc[_HSI]); + + /* select DIV */ + debug("select DIV\n"); + /* no ready bit when MPUSRC != CLK_MPU_PLL1P_DIV, MPUDIV is disabled */ + writel(clkdiv[CLKDIV_MPU] & RCC_DIVR_DIV_MASK, rcc + RCC_MPCKDIVR); + set_clkdiv(clkdiv[CLKDIV_AXI], rcc + RCC_AXIDIVR); + set_clkdiv(clkdiv[CLKDIV_APB4], rcc + RCC_APB4DIVR); + set_clkdiv(clkdiv[CLKDIV_APB5], rcc + RCC_APB5DIVR); + set_clkdiv(clkdiv[CLKDIV_MCU], rcc + RCC_MCUDIVR); + set_clkdiv(clkdiv[CLKDIV_APB1], rcc + RCC_APB1DIVR); + set_clkdiv(clkdiv[CLKDIV_APB2], rcc + RCC_APB2DIVR); + set_clkdiv(clkdiv[CLKDIV_APB3], rcc + RCC_APB3DIVR); + + /* no ready bit for RTC */ + writel(clkdiv[CLKDIV_RTC] & RCC_DIVR_DIV_MASK, rcc + RCC_RTCDIVR); + + /* configure PLLs source */ + debug("configure PLLs source\n"); + set_clksrc(priv, clksrc[CLKSRC_PLL12]); + set_clksrc(priv, clksrc[CLKSRC_PLL3]); + set_clksrc(priv, clksrc[CLKSRC_PLL4]); + + /* configure and start PLLs */ + debug("configure PLLs\n"); + for (i = 0; i < _PLL_NB; i++) { + u32 fracv; + u32 csg[PLLCSG_NB]; + + debug("configure PLL %d @ %d\n", i, + ofnode_to_offset(plloff[i])); + if (!ofnode_valid(plloff[i])) + continue; + + fracv = ofnode_read_u32_default(plloff[i], "frac", 0); + pll_config(priv, i, pllcfg[i], fracv); + ret = ofnode_read_u32_array(plloff[i], "csg", csg, PLLCSG_NB); + if (!ret) { + pll_csg(priv, i, csg); + } else if (ret != -FDT_ERR_NOTFOUND) { + debug("invalid csg node for pll@%d res=%d\n", i, ret); + return ret; + } + pll_start(priv, i); + } + + /* wait and start PLLs ouptut when ready */ + for (i = 0; i < _PLL_NB; i++) { + if (!ofnode_valid(plloff[i])) + continue; + debug("output PLL %d\n", i); + pll_output(priv, i, pllcfg[i][PLLCFG_O]); + } + + /* wait LSE ready before to use it */ + if (priv->osc[_LSE]) + stm32mp1_lse_wait(rcc); + + /* configure with expected clock source */ + debug("CLKSRC\n"); + set_clksrc(priv, clksrc[CLKSRC_MPU]); + set_clksrc(priv, clksrc[CLKSRC_AXI]); + set_clksrc(priv, clksrc[CLKSRC_MCU]); + set_rtcsrc(priv, clksrc[CLKSRC_RTC], lse_css); + + /* configure PKCK */ + debug("PKCK\n"); + pkcs_cell = dev_read_prop(dev, "st,pkcs", &len); + if (pkcs_cell) { + bool ckper_disabled = false; + + for (i = 0; i < len / sizeof(u32); i++) { + u32 pkcs = (u32)fdt32_to_cpu(pkcs_cell[i]); + + if (pkcs == CLK_CKPER_DISABLED) { + ckper_disabled = true; + continue; + } + pkcs_config(priv, pkcs); + } + /* CKPER is source for some peripheral clock + * (FMC-NAND / QPSI-NOR) and switching source is allowed + * only if previous clock is still ON + * => deactivated CKPER only after switching clock + */ + if (ckper_disabled) + pkcs_config(priv, CLK_CKPER_DISABLED); + } + + debug("oscillator off\n"); + /* switch OFF HSI if not found in device-tree */ + if (!priv->osc[_HSI]) + stm32mp1_hsi_set(rcc, 0); + + /* Software Self-Refresh mode (SSR) during DDR initilialization */ + clrsetbits_le32(priv->base + RCC_DDRITFCR, + RCC_DDRITFCR_DDRCKMOD_MASK, + RCC_DDRITFCR_DDRCKMOD_SSR << + RCC_DDRITFCR_DDRCKMOD_SHIFT); + + return 0; +} +#endif /* STM32MP1_CLOCK_TREE_INIT */ + static void stm32mp1_osc_clk_init(const char *name, struct stm32mp1_clk_priv *priv, int index) @@ -1133,6 +1703,12 @@ static int stm32mp1_clk_probe(struct udevice *dev)
stm32mp1_osc_init(dev);
+#ifdef STM32MP1_CLOCK_TREE_INIT + /* clock tree init is done only one time, before relocation */ + if (!(gd->flags & GD_FLG_RELOC)) + result = stm32mp1_clktree(dev); +#endif + return result; }
diff --git a/include/dt-bindings/clock/stm32mp1-clksrc.h b/include/dt-bindings/clock/stm32mp1-clksrc.h new file mode 100644 index 0000000..19fd959 --- /dev/null +++ b/include/dt-bindings/clock/stm32mp1-clksrc.h @@ -0,0 +1,284 @@ +/* + * Copyright (C) 2018, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause + */ + +#ifndef _DT_BINDINGS_CLOCK_STM32MP1_CLKSRC_H_ +#define _DT_BINDINGS_CLOCK_STM32MP1_CLKSRC_H_ + +/* PLL output is enable when x=1, with x=p,q or r */ +#define PQR(p, q, r) (((p) & 1) | (((q) & 1) << 1) | (((r) & 1) << 2)) + +/* st,clksrc: mandatory clock source */ + +#define CLK_MPU_HSI 0x00000200 +#define CLK_MPU_HSE 0x00000201 +#define CLK_MPU_PLL1P 0x00000202 +#define CLK_MPU_PLL1P_DIV 0x00000203 + +#define CLK_AXI_HSI 0x00000240 +#define CLK_AXI_HSE 0x00000241 +#define CLK_AXI_PLL2P 0x00000242 + +#define CLK_MCU_HSI 0x00000480 +#define CLK_MCU_HSE 0x00000481 +#define CLK_MCU_CSI 0x00000482 +#define CLK_MCU_PLL3P 0x00000483 + +#define CLK_PLL12_HSI 0x00000280 +#define CLK_PLL12_HSE 0x00000281 + +#define CLK_PLL3_HSI 0x00008200 +#define CLK_PLL3_HSE 0x00008201 +#define CLK_PLL3_CSI 0x00008202 + +#define CLK_PLL4_HSI 0x00008240 +#define CLK_PLL4_HSE 0x00008241 +#define CLK_PLL4_CSI 0x00008242 +#define CLK_PLL4_I2SCKIN 0x00008243 + +#define CLK_RTC_DISABLED 0x00001400 +#define CLK_RTC_LSE 0x00001401 +#define CLK_RTC_LSI 0x00001402 +#define CLK_RTC_HSE 0x00001403 + +#define CLK_MCO1_HSI 0x00008000 +#define CLK_MCO1_HSE 0x00008001 +#define CLK_MCO1_CSI 0x00008002 +#define CLK_MCO1_LSI 0x00008003 +#define CLK_MCO1_LSE 0x00008004 +#define CLK_MCO1_DISABLED 0x0000800F + +#define CLK_MCO2_MPU 0x00008040 +#define CLK_MCO2_AXI 0x00008041 +#define CLK_MCO2_MCU 0x00008042 +#define CLK_MCO2_PLL4P 0x00008043 +#define CLK_MCO2_HSE 0x00008044 +#define CLK_MCO2_HSI 0x00008045 +#define CLK_MCO2_DISABLED 0x0000804F + +/* st,pkcs: peripheral kernel clock source */ + +#define CLK_I2C12_PCLK1 0x00008C00 +#define CLK_I2C12_PLL4R 0x00008C01 +#define CLK_I2C12_HSI 0x00008C02 +#define CLK_I2C12_CSI 0x00008C03 +#define CLK_I2C12_DISABLED 0x00008C07 + +#define CLK_I2C35_PCLK1 0x00008C40 +#define CLK_I2C35_PLL4R 0x00008C41 +#define CLK_I2C35_HSI 0x00008C42 +#define CLK_I2C35_CSI 0x00008C43 +#define CLK_I2C35_DISABLED 0x00008C47 + +#define CLK_I2C46_PCLK5 0x00000C00 +#define CLK_I2C46_PLL3Q 0x00000C01 +#define CLK_I2C46_HSI 0x00000C02 +#define CLK_I2C46_CSI 0x00000C03 +#define CLK_I2C46_DISABLED 0x00000C07 + +#define CLK_SAI1_PLL4Q 0x00008C80 +#define CLK_SAI1_PLL3Q 0x00008C81 +#define CLK_SAI1_I2SCKIN 0x00008C82 +#define CLK_SAI1_CKPER 0x00008C83 +#define CLK_SAI1_PLL3R 0x00008C84 +#define CLK_SAI1_DISABLED 0x00008C87 + +#define CLK_SAI2_PLL4Q 0x00008CC0 +#define CLK_SAI2_PLL3Q 0x00008CC1 +#define CLK_SAI2_I2SCKIN 0x00008CC2 +#define CLK_SAI2_CKPER 0x00008CC3 +#define CLK_SAI2_SPDIF 0x00008CC4 +#define CLK_SAI2_PLL3R 0x00008CC5 +#define CLK_SAI2_DISABLED 0x00008CC7 + +#define CLK_SAI3_PLL4Q 0x00008D00 +#define CLK_SAI3_PLL3Q 0x00008D01 +#define CLK_SAI3_I2SCKIN 0x00008D02 +#define CLK_SAI3_CKPER 0x00008D03 +#define CLK_SAI3_PLL3R 0x00008D04 +#define CLK_SAI3_DISABLED 0x00008D07 + +#define CLK_SAI4_PLL4Q 0x00008D40 +#define CLK_SAI4_PLL3Q 0x00008D41 +#define CLK_SAI4_I2SCKIN 0x00008D42 +#define CLK_SAI4_CKPER 0x00008D43 +#define CLK_SAI4_PLL3R 0x00008D44 +#define CLK_SAI4_DISABLED 0x00008D47 + +#define CLK_SPI2S1_PLL4P 0x00008D80 +#define CLK_SPI2S1_PLL3Q 0x00008D81 +#define CLK_SPI2S1_I2SCKIN 0x00008D82 +#define CLK_SPI2S1_CKPER 0x00008D83 +#define CLK_SPI2S1_PLL3R 0x00008D84 +#define CLK_SPI2S1_DISABLED 0x00008D87 + +#define CLK_SPI2S23_PLL4P 0x00008DC0 +#define CLK_SPI2S23_PLL3Q 0x00008DC1 +#define CLK_SPI2S23_I2SCKIN 0x00008DC2 +#define CLK_SPI2S23_CKPER 0x00008DC3 +#define CLK_SPI2S23_PLL3R 0x00008DC4 +#define CLK_SPI2S23_DISABLED 0x00008DC7 + +#define CLK_SPI45_PCLK2 0x00008E00 +#define CLK_SPI45_PLL4Q 0x00008E01 +#define CLK_SPI45_HSI 0x00008E02 +#define CLK_SPI45_CSI 0x00008E03 +#define CLK_SPI45_HSE 0x00008E04 +#define CLK_SPI45_DISABLED 0x00008E07 + +#define CLK_SPI6_PCLK5 0x00000C40 +#define CLK_SPI6_PLL4Q 0x00000C41 +#define CLK_SPI6_HSI 0x00000C42 +#define CLK_SPI6_CSI 0x00000C43 +#define CLK_SPI6_HSE 0x00000C44 +#define CLK_SPI6_PLL3Q 0x00000C45 +#define CLK_SPI6_DISABLED 0x00000C47 + +#define CLK_UART6_PCLK2 0x00008E40 +#define CLK_UART6_PLL4Q 0x00008E41 +#define CLK_UART6_HSI 0x00008E42 +#define CLK_UART6_CSI 0x00008E43 +#define CLK_UART6_HSE 0x00008E44 +#define CLK_UART6_DISABLED 0x00008E47 + +#define CLK_UART24_PCLK1 0x00008E80 +#define CLK_UART24_PLL4Q 0x00008E81 +#define CLK_UART24_HSI 0x00008E82 +#define CLK_UART24_CSI 0x00008E83 +#define CLK_UART24_HSE 0x00008E84 +#define CLK_UART24_DISABLED 0x00008E87 + +#define CLK_UART35_PCLK1 0x00008EC0 +#define CLK_UART35_PLL4Q 0x00008EC1 +#define CLK_UART35_HSI 0x00008EC2 +#define CLK_UART35_CSI 0x00008EC3 +#define CLK_UART35_HSE 0x00008EC4 +#define CLK_UART35_DISABLED 0x00008EC7 + +#define CLK_UART78_PCLK1 0x00008F00 +#define CLK_UART78_PLL4Q 0x00008F01 +#define CLK_UART78_HSI 0x00008F02 +#define CLK_UART78_CSI 0x00008F03 +#define CLK_UART78_HSE 0x00008F04 +#define CLK_UART78_DISABLED 0x00008F07 + +#define CLK_UART1_PCLK5 0x00000C80 +#define CLK_UART1_PLL3Q 0x00000C81 +#define CLK_UART1_HSI 0x00000C82 +#define CLK_UART1_CSI 0x00000C83 +#define CLK_UART1_PLL4Q 0x00000C84 +#define CLK_UART1_HSE 0x00000C85 +#define CLK_UART1_DISABLED 0x00000C87 + +#define CLK_SDMMC12_HCLK6 0x00008F40 +#define CLK_SDMMC12_PLL3R 0x00008F41 +#define CLK_SDMMC12_PLL4P 0x00008F42 +#define CLK_SDMMC12_HSI 0x00008F43 +#define CLK_SDMMC12_DISABLED 0x00008F47 + +#define CLK_SDMMC3_HCLK2 0x00008F80 +#define CLK_SDMMC3_PLL3R 0x00008F81 +#define CLK_SDMMC3_PLL4P 0x00008F82 +#define CLK_SDMMC3_HSI 0x00008F83 +#define CLK_SDMMC3_DISABLED 0x00008F87 + +#define CLK_ETH_PLL4P 0x00008FC0 +#define CLK_ETH_PLL3Q 0x00008FC1 +#define CLK_ETH_DISABLED 0x00008FC3 + +#define CLK_QSPI_ACLK 0x00009000 +#define CLK_QSPI_PLL3R 0x00009001 +#define CLK_QSPI_PLL4P 0x00009002 +#define CLK_QSPI_CKPER 0x00009003 + +#define CLK_FMC_ACLK 0x00009040 +#define CLK_FMC_PLL3R 0x00009041 +#define CLK_FMC_PLL4P 0x00009042 +#define CLK_FMC_CKPER 0x00009043 + +#define CLK_FDCAN_HSE 0x000090C0 +#define CLK_FDCAN_PLL3Q 0x000090C1 +#define CLK_FDCAN_PLL4Q 0x000090C2 +#define CLK_FDCAN_PLL4R 0x000090C3 + +#define CLK_SPDIF_PLL4P 0x00009140 +#define CLK_SPDIF_PLL3Q 0x00009141 +#define CLK_SPDIF_HSI 0x00009142 +#define CLK_SPDIF_DISABLED 0x00009143 + +#define CLK_CEC_LSE 0x00009180 +#define CLK_CEC_LSI 0x00009181 +#define CLK_CEC_CSI_DIV122 0x00009182 +#define CLK_CEC_DISABLED 0x00009183 + +#define CLK_USBPHY_HSE 0x000091C0 +#define CLK_USBPHY_PLL4R 0x000091C1 +#define CLK_USBPHY_HSE_DIV2 0x000091C2 +#define CLK_USBPHY_DISABLED 0x000091C3 + +#define CLK_USBO_PLL4R 0x800091C0 +#define CLK_USBO_USBPHY 0x800091C1 + +#define CLK_RNG1_CSI 0x00000CC0 +#define CLK_RNG1_PLL4R 0x00000CC1 +#define CLK_RNG1_LSE 0x00000CC2 +#define CLK_RNG1_LSI 0x00000CC3 + +#define CLK_RNG2_CSI 0x00009200 +#define CLK_RNG2_PLL4R 0x00009201 +#define CLK_RNG2_LSE 0x00009202 +#define CLK_RNG2_LSI 0x00009203 + +#define CLK_CKPER_HSI 0x00000D00 +#define CLK_CKPER_CSI 0x00000D01 +#define CLK_CKPER_HSE 0x00000D02 +#define CLK_CKPER_DISABLED 0x00000D03 + +#define CLK_STGEN_HSI 0x00000D40 +#define CLK_STGEN_HSE 0x00000D41 +#define CLK_STGEN_DISABLED 0x00000D43 + +#define CLK_DSI_DSIPLL 0x00009240 +#define CLK_DSI_PLL4P 0x00009241 + +#define CLK_ADC_PLL4R 0x00009280 +#define CLK_ADC_CKPER 0x00009281 +#define CLK_ADC_PLL3Q 0x00009282 +#define CLK_ADC_DISABLED 0x00009283 + +#define CLK_LPTIM45_PCLK3 0x000092C0 +#define CLK_LPTIM45_PLL4P 0x000092C1 +#define CLK_LPTIM45_PLL3Q 0x000092C2 +#define CLK_LPTIM45_LSE 0x000092C3 +#define CLK_LPTIM45_LSI 0x000092C4 +#define CLK_LPTIM45_CKPER 0x000092C5 +#define CLK_LPTIM45_DISABLED 0x000092C7 + +#define CLK_LPTIM23_PCLK3 0x00009300 +#define CLK_LPTIM23_PLL4Q 0x00009301 +#define CLK_LPTIM23_CKPER 0x00009302 +#define CLK_LPTIM23_LSE 0x00009303 +#define CLK_LPTIM23_LSI 0x00009304 +#define CLK_LPTIM23_DISABLED 0x00009307 + +#define CLK_LPTIM1_PCLK1 0x00009340 +#define CLK_LPTIM1_PLL4P 0x00009341 +#define CLK_LPTIM1_PLL3Q 0x00009342 +#define CLK_LPTIM1_LSE 0x00009343 +#define CLK_LPTIM1_LSI 0x00009344 +#define CLK_LPTIM1_CKPER 0x00009345 +#define CLK_LPTIM1_DISABLED 0x00009347 + +/* define for st,pll /csg */ +#define SSCG_MODE_CENTER_SPREAD 0 +#define SSCG_MODE_DOWN_SPREAD 1 + +/* define for st,drive */ +#define LSEDRV_LOWEST 0 +#define LSEDRV_MEDIUM_LOW 1 +#define LSEDRV_MEDIUM_HIGH 2 +#define LSEDRV_HIGHEST 3 + +#endif