diff options
Diffstat (limited to 'drivers/clk/ingenic/jz4760-cgu.c')
| -rw-r--r-- | drivers/clk/ingenic/jz4760-cgu.c | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/drivers/clk/ingenic/jz4760-cgu.c b/drivers/clk/ingenic/jz4760-cgu.c new file mode 100644 index 000000000..e407f00bd --- /dev/null +++ b/drivers/clk/ingenic/jz4760-cgu.c @@ -0,0 +1,446 @@ +// 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) - 1; + + /* 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); + + rate /= MHZ; + parent_rate /= MHZ; + + for (m = m_max; m >= m_max && n >= 2; n--) { + m = rate * n / parent_rate; + od = m & 1; + m <<= od; + } + + *pm = m; + *pn = n + 1; + *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); |