// SPDX-License-Identifier: GPL-2.0 /* * JZ4760 SoC CGU driver * Copyright 2018, Paul Cercueil <paul@crapouillou.net> */ #include <linux/bitops.h> #include <linux/clk-provider.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/of.h> #include <linux/clk.h> #include <dt-bindings/clock/ingenic,jz4760-cgu.h> #include "cgu.h" #include "pm.h" #define MHZ (1000 * 1000) /* * CPM registers offset address definition */ #define CGU_REG_CPCCR 0x00 #define CGU_REG_LCR 0x04 #define CGU_REG_CPPCR0 0x10 #define CGU_REG_CLKGR0 0x20 #define CGU_REG_OPCR 0x24 #define CGU_REG_CLKGR1 0x28 #define CGU_REG_CPPCR1 0x30 #define CGU_REG_USBPCR 0x3c #define CGU_REG_USBCDR 0x50 #define CGU_REG_I2SCDR 0x60 #define CGU_REG_LPCDR 0x64 #define CGU_REG_MSCCDR 0x68 #define CGU_REG_UHCCDR 0x6c #define CGU_REG_SSICDR 0x74 #define CGU_REG_CIMCDR 0x7c #define CGU_REG_GPSCDR 0x80 #define CGU_REG_PCMCDR 0x84 #define CGU_REG_GPUCDR 0x88 static const s8 pll_od_encoding[8] = { 0x0, 0x1, -1, 0x2, -1, -1, -1, 0x3, }; static const u8 jz4760_cgu_cpccr_div_table[] = { 1, 2, 3, 4, 6, 8, }; static const u8 jz4760_cgu_pll_half_div_table[] = { 2, 1, }; static void jz4760_cgu_calc_m_n_od(const struct ingenic_cgu_pll_info *pll_info, unsigned long rate, unsigned long parent_rate, unsigned int *pm, unsigned int *pn, unsigned int *pod) { unsigned int m, n, od, m_max = (1 << pll_info->m_bits) - 2; /* The frequency after the N divider must be between 1 and 50 MHz. */ n = parent_rate / (1 * MHZ); /* The N divider must be >= 2. */ n = clamp_val(n, 2, 1 << pll_info->n_bits); for (;; n >>= 1) { od = (unsigned int)-1; do { m = (rate / MHZ) * (1 << ++od) * n / (parent_rate / MHZ); } while ((m > m_max || m & 1) && (od < 4)); if (od < 4 && m >= 4 && m <= m_max) break; } *pm = m; *pn = n; *pod = 1 << od; } static const struct ingenic_cgu_clk_info jz4760_cgu_clocks[] = { /* External clocks */ [JZ4760_CLK_EXT] = { "ext", CGU_CLK_EXT }, [JZ4760_CLK_OSC32K] = { "osc32k", CGU_CLK_EXT }, /* PLLs */ [JZ4760_CLK_PLL0] = { "pll0", CGU_CLK_PLL, .parents = { JZ4760_CLK_EXT }, .pll = { .reg = CGU_REG_CPPCR0, .rate_multiplier = 1, .m_shift = 23, .m_bits = 8, .m_offset = 0, .n_shift = 18, .n_bits = 4, .n_offset = 0, .od_shift = 16, .od_bits = 2, .od_max = 8, .od_encoding = pll_od_encoding, .bypass_reg = CGU_REG_CPPCR0, .bypass_bit = 9, .enable_bit = 8, .stable_bit = 10, .calc_m_n_od = jz4760_cgu_calc_m_n_od, }, }, [JZ4760_CLK_PLL1] = { /* TODO: PLL1 can depend on PLL0 */ "pll1", CGU_CLK_PLL, .parents = { JZ4760_CLK_EXT }, .pll = { .reg = CGU_REG_CPPCR1, .rate_multiplier = 1, .m_shift = 23, .m_bits = 8, .m_offset = 0, .n_shift = 18, .n_bits = 4, .n_offset = 0, .od_shift = 16, .od_bits = 2, .od_max = 8, .od_encoding = pll_od_encoding, .bypass_bit = -1, .enable_bit = 7, .stable_bit = 6, .calc_m_n_od = jz4760_cgu_calc_m_n_od, }, }, /* Main clocks */ [JZ4760_CLK_CCLK] = { "cclk", CGU_CLK_DIV, /* * Disabling the CPU clock or any parent clocks will hang the * system; mark it critical. */ .flags = CLK_IS_CRITICAL, .parents = { JZ4760_CLK_PLL0, }, .div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, 0, jz4760_cgu_cpccr_div_table, }, }, [JZ4760_CLK_HCLK] = { "hclk", CGU_CLK_DIV, .parents = { JZ4760_CLK_PLL0, }, .div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, 0, jz4760_cgu_cpccr_div_table, }, }, [JZ4760_CLK_SCLK] = { "sclk", CGU_CLK_DIV, .parents = { JZ4760_CLK_PLL0, }, .div = { CGU_REG_CPCCR, 24, 1, 4, 22, -1, -1, 0, jz4760_cgu_cpccr_div_table, }, }, [JZ4760_CLK_H2CLK] = { "h2clk", CGU_CLK_DIV, .parents = { JZ4760_CLK_PLL0, }, .div = { CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1, 0, jz4760_cgu_cpccr_div_table, }, }, [JZ4760_CLK_MCLK] = { "mclk", CGU_CLK_DIV, /* * Disabling MCLK or its parents will render DRAM * inaccessible; mark it critical. */ .flags = CLK_IS_CRITICAL, .parents = { JZ4760_CLK_PLL0, }, .div = { CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, 0, jz4760_cgu_cpccr_div_table, }, }, [JZ4760_CLK_PCLK] = { "pclk", CGU_CLK_DIV, .parents = { JZ4760_CLK_PLL0, }, .div = { CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, 0, jz4760_cgu_cpccr_div_table, }, }, /* Divided clocks */ [JZ4760_CLK_PLL0_HALF] = { "pll0_half", CGU_CLK_DIV, .parents = { JZ4760_CLK_PLL0 }, .div = { CGU_REG_CPCCR, 21, 1, 1, 22, -1, -1, 0, jz4760_cgu_pll_half_div_table, }, }, /* Those divided clocks can connect to PLL0 or PLL1 */ [JZ4760_CLK_UHC] = { "uhc", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1, }, .mux = { CGU_REG_UHCCDR, 31, 1 }, .div = { CGU_REG_UHCCDR, 0, 1, 4, -1, -1, -1 }, .gate = { CGU_REG_CLKGR0, 24 }, }, [JZ4760_CLK_GPU] = { "gpu", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1, }, .mux = { CGU_REG_GPUCDR, 31, 1 }, .div = { CGU_REG_GPUCDR, 0, 1, 3, -1, -1, -1 }, .gate = { CGU_REG_CLKGR1, 9 }, }, [JZ4760_CLK_LPCLK_DIV] = { "lpclk_div", CGU_CLK_DIV | CGU_CLK_MUX, .parents = { JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1, }, .mux = { CGU_REG_LPCDR, 29, 1 }, .div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 }, }, [JZ4760_CLK_TVE] = { "tve", CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_LPCLK_DIV, JZ4760_CLK_EXT, }, .mux = { CGU_REG_LPCDR, 31, 1 }, .gate = { CGU_REG_CLKGR0, 27 }, }, [JZ4760_CLK_LPCLK] = { "lpclk", CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_LPCLK_DIV, JZ4760_CLK_TVE, }, .mux = { CGU_REG_LPCDR, 30, 1 }, .gate = { CGU_REG_CLKGR0, 28 }, }, [JZ4760_CLK_GPS] = { "gps", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1, }, .mux = { CGU_REG_GPSCDR, 31, 1 }, .div = { CGU_REG_GPSCDR, 0, 1, 4, -1, -1, -1 }, .gate = { CGU_REG_CLKGR0, 22 }, }, /* Those divided clocks can connect to EXT, PLL0 or PLL1 */ [JZ4760_CLK_PCM] = { "pcm", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_EXT, -1, JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1 }, .mux = { CGU_REG_PCMCDR, 30, 2 }, .div = { CGU_REG_PCMCDR, 0, 1, 9, -1, -1, -1, BIT(0) }, .gate = { CGU_REG_CLKGR1, 8 }, }, [JZ4760_CLK_I2S] = { "i2s", CGU_CLK_DIV | CGU_CLK_MUX, .parents = { JZ4760_CLK_EXT, -1, JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1 }, .mux = { CGU_REG_I2SCDR, 30, 2 }, .div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1, BIT(0) }, }, [JZ4760_CLK_OTG] = { "usb", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX, .parents = { JZ4760_CLK_EXT, -1, JZ4760_CLK_PLL0_HALF, JZ4760_CLK_PLL1 }, .mux = { CGU_REG_USBCDR, 30, 2 }, .div = { CGU_REG_USBCDR, 0, 1, 8, -1, -1, -1 }, .gate = { CGU_REG_CLKGR0, 2 }, }, /* Those divided clocks can connect to EXT or PLL0 */ [JZ4760_CLK_MMC_MUX] = { "mmc_mux", CGU_CLK_MUX | CGU_CLK_DIV, .parents = { JZ4760_CLK_EXT, JZ4760_CLK_PLL0_HALF, }, .mux = { CGU_REG_MSCCDR, 31, 1 }, .div = { CGU_REG_MSCCDR, 0, 1, 6, -1, -1, -1, BIT(0) }, }, [JZ4760_CLK_SSI_MUX] = { "ssi_mux", CGU_CLK_DIV | CGU_CLK_MUX, .parents = { JZ4760_CLK_EXT, JZ4760_CLK_PLL0_HALF, }, .mux = { CGU_REG_SSICDR, 31, 1 }, .div = { CGU_REG_SSICDR, 0, 1, 6, -1, -1, -1, BIT(0) }, }, /* These divided clock can connect to PLL0 only */ [JZ4760_CLK_CIM] = { "cim", CGU_CLK_DIV | CGU_CLK_GATE, .parents = { JZ4760_CLK_PLL0_HALF }, .div = { CGU_REG_CIMCDR, 0, 1, 8, -1, -1, -1 }, .gate = { CGU_REG_CLKGR0, 26 }, }, /* Gate-only clocks */ [JZ4760_CLK_SSI0] = { "ssi0", CGU_CLK_GATE, .parents = { JZ4760_CLK_SSI_MUX, }, .gate = { CGU_REG_CLKGR0, 4 }, }, [JZ4760_CLK_SSI1] = { "ssi1", CGU_CLK_GATE, .parents = { JZ4760_CLK_SSI_MUX, }, .gate = { CGU_REG_CLKGR0, 19 }, }, [JZ4760_CLK_SSI2] = { "ssi2", CGU_CLK_GATE, .parents = { JZ4760_CLK_SSI_MUX, }, .gate = { CGU_REG_CLKGR0, 20 }, }, [JZ4760_CLK_DMA] = { "dma", CGU_CLK_GATE, .parents = { JZ4760_CLK_H2CLK, }, .gate = { CGU_REG_CLKGR0, 21 }, }, [JZ4760_CLK_MDMA] = { "mdma", CGU_CLK_GATE, .parents = { JZ4760_CLK_HCLK, }, .gate = { CGU_REG_CLKGR0, 25 }, }, [JZ4760_CLK_BDMA] = { "bdma", CGU_CLK_GATE, .parents = { JZ4760_CLK_HCLK, }, .gate = { CGU_REG_CLKGR1, 0 }, }, [JZ4760_CLK_I2C0] = { "i2c0", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 5 }, }, [JZ4760_CLK_I2C1] = { "i2c1", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 6 }, }, [JZ4760_CLK_UART0] = { "uart0", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 15 }, }, [JZ4760_CLK_UART1] = { "uart1", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 16 }, }, [JZ4760_CLK_UART2] = { "uart2", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 17 }, }, [JZ4760_CLK_UART3] = { "uart3", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 18 }, }, [JZ4760_CLK_IPU] = { "ipu", CGU_CLK_GATE, .parents = { JZ4760_CLK_HCLK, }, .gate = { CGU_REG_CLKGR0, 29 }, }, [JZ4760_CLK_ADC] = { "adc", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 14 }, }, [JZ4760_CLK_AIC] = { "aic", CGU_CLK_GATE, .parents = { JZ4760_CLK_EXT, }, .gate = { CGU_REG_CLKGR0, 8 }, }, [JZ4760_CLK_VPU] = { "vpu", CGU_CLK_GATE, .parents = { JZ4760_CLK_HCLK, }, .gate = { CGU_REG_LCR, 30, false, 150 }, }, [JZ4760_CLK_MMC0] = { "mmc0", CGU_CLK_GATE, .parents = { JZ4760_CLK_MMC_MUX, }, .gate = { CGU_REG_CLKGR0, 3 }, }, [JZ4760_CLK_MMC1] = { "mmc1", CGU_CLK_GATE, .parents = { JZ4760_CLK_MMC_MUX, }, .gate = { CGU_REG_CLKGR0, 11 }, }, [JZ4760_CLK_MMC2] = { "mmc2", CGU_CLK_GATE, .parents = { JZ4760_CLK_MMC_MUX, }, .gate = { CGU_REG_CLKGR0, 12 }, }, [JZ4760_CLK_UHC_PHY] = { "uhc_phy", CGU_CLK_GATE, .parents = { JZ4760_CLK_UHC, }, .gate = { CGU_REG_OPCR, 5 }, }, [JZ4760_CLK_OTG_PHY] = { "usb_phy", CGU_CLK_GATE, .parents = { JZ4760_CLK_OTG }, .gate = { CGU_REG_OPCR, 7, true, 50 }, }, /* Custom clocks */ [JZ4760_CLK_EXT512] = { "ext/512", CGU_CLK_FIXDIV, .parents = { JZ4760_CLK_EXT }, .fixdiv = { 512 }, }, [JZ4760_CLK_RTC] = { "rtc", CGU_CLK_MUX, .parents = { JZ4760_CLK_EXT512, JZ4760_CLK_OSC32K, }, .mux = { CGU_REG_OPCR, 2, 1}, }, }; static void __init jz4760_cgu_init(struct device_node *np) { struct ingenic_cgu *cgu; int retval; cgu = ingenic_cgu_new(jz4760_cgu_clocks, ARRAY_SIZE(jz4760_cgu_clocks), np); if (!cgu) { pr_err("%s: failed to initialise CGU\n", __func__); return; } retval = ingenic_cgu_register_clocks(cgu); if (retval) pr_err("%s: failed to register CGU Clocks\n", __func__); ingenic_cgu_register_syscore_ops(cgu); } /* We only probe via devicetree, no need for a platform driver */ CLK_OF_DECLARE_DRIVER(jz4760_cgu, "ingenic,jz4760-cgu", jz4760_cgu_init); /* JZ4760B has some small differences, but we don't implement them. */ CLK_OF_DECLARE_DRIVER(jz4760b_cgu, "ingenic,jz4760b-cgu", jz4760_cgu_init);