diff options
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/meson/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/clk/meson/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/meson/g12a.c | 315 |
3 files changed, 324 insertions, 0 deletions
diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig index 2419a30dcb..994b44ad7a 100644 --- a/drivers/clk/meson/Kconfig +++ b/drivers/clk/meson/Kconfig @@ -13,3 +13,11 @@ config CLK_MESON_AXG help Enable clock support for the Amlogic AXG SoC family, such as the A113X/D + +config CLK_MESON_G12A + bool "Enable clock support for Amlogic G12A" + depends on CLK && ARCH_MESON + default MESON_G12A + help + Enable clock support for the Amlogic G12A SoC family, such as + the S905X/D2 diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index 47a5ad588e..c873d6976f 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -5,4 +5,5 @@ obj-$(CONFIG_CLK_MESON_GX) += gxbb.o obj-$(CONFIG_CLK_MESON_AXG) += axg.o +obj-$(CONFIG_CLK_MESON_G12A) += g12a.o diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c new file mode 100644 index 0000000000..fedc9eb7dd --- /dev/null +++ b/drivers/clk/meson/g12a.c @@ -0,0 +1,315 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 - Beniamino Galvani <b.galvani@gmail.com> + * (C) Copyright 2018 - BayLibre, SAS + * Author: Neil Armstrong <narmstrong@baylibre.com> + */ + +#include <common.h> +#include <asm/arch/clock-g12a.h> +#include <asm/io.h> +#include <clk-uclass.h> +#include <dm.h> +#include <regmap.h> +#include <syscon.h> +#include <div64.h> +#include <dt-bindings/clock/g12a-clkc.h> +#include "clk_meson.h" + +#define XTAL_RATE 24000000 + +struct meson_clk { + struct regmap *map; +}; + +static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id); + +#define NUM_CLKS 178 + +static struct meson_gate gates[NUM_CLKS] = { + /* Everything Else (EE) domain gates */ + MESON_GATE(CLKID_SPICC0, HHI_GCLK_MPEG0, 8), + MESON_GATE(CLKID_I2C, HHI_GCLK_MPEG0, 9), + MESON_GATE(CLKID_UART0, HHI_GCLK_MPEG0, 13), + MESON_GATE(CLKID_SPICC1, HHI_GCLK_MPEG0, 14), + MESON_GATE(CLKID_SD_EMMC_B, HHI_GCLK_MPEG0, 25), + MESON_GATE(CLKID_SD_EMMC_C, HHI_GCLK_MPEG0, 26), + MESON_GATE(CLKID_ETH, HHI_GCLK_MPEG1, 3), + MESON_GATE(CLKID_UART1, HHI_GCLK_MPEG1, 16), + + /* Peripheral Gates */ + MESON_GATE(CLKID_SD_EMMC_B_CLK0, HHI_SD_EMMC_CLK_CNTL, 23), + MESON_GATE(CLKID_SD_EMMC_C_CLK0, HHI_NAND_CLK_CNTL, 7), +}; + +static int meson_set_gate(struct clk *clk, bool on) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + struct meson_gate *gate; + + if (clk->id >= ARRAY_SIZE(gates)) + return -ENOENT; + + gate = &gates[clk->id]; + + if (gate->reg == 0) + return 0; + + regmap_update_bits(priv->map, gate->reg, + BIT(gate->bit), on ? BIT(gate->bit) : 0); + + return 0; +} + +static int meson_clk_enable(struct clk *clk) +{ + return meson_set_gate(clk, true); +} + +static int meson_clk_disable(struct clk *clk) +{ + return meson_set_gate(clk, false); +} + +static unsigned long meson_clk81_get_rate(struct clk *clk) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + unsigned long parent_rate; + uint reg; + int parents[] = { + -1, + -1, + CLKID_FCLK_DIV7, + CLKID_MPLL1, + CLKID_MPLL2, + CLKID_FCLK_DIV4, + CLKID_FCLK_DIV3, + CLKID_FCLK_DIV5 + }; + + /* mux */ + regmap_read(priv->map, HHI_MPEG_CLK_CNTL, ®); + reg = (reg >> 12) & 7; + + switch (reg) { + case 0: + parent_rate = XTAL_RATE; + break; + case 1: + return -ENOENT; + default: + parent_rate = meson_clk_get_rate_by_id(clk, parents[reg]); + } + + /* divider */ + regmap_read(priv->map, HHI_MPEG_CLK_CNTL, ®); + reg = reg & ((1 << 7) - 1); + + return parent_rate / reg; +} + +static long mpll_rate_from_params(unsigned long parent_rate, + unsigned long sdm, + unsigned long n2) +{ + unsigned long divisor = (SDM_DEN * n2) + sdm; + + if (n2 < N2_MIN) + return -EINVAL; + + return DIV_ROUND_UP_ULL((u64)parent_rate * SDM_DEN, divisor); +} + +static struct parm meson_mpll0_parm[2] = { + {HHI_MPLL_CNTL1, 0, 14}, /* psdm */ + {HHI_MPLL_CNTL1, 20, 9}, /* pn2 */ +}; + +static struct parm meson_mpll1_parm[2] = { + {HHI_MPLL_CNTL3, 0, 14}, /* psdm */ + {HHI_MPLL_CNTL3, 20, 9}, /* pn2 */ +}; + +static struct parm meson_mpll2_parm[2] = { + {HHI_MPLL_CNTL5, 0, 14}, /* psdm */ + {HHI_MPLL_CNTL5, 20, 9}, /* pn2 */ +}; + +/* + * MultiPhase Locked Loops are outputs from a PLL with additional frequency + * scaling capabilities. MPLL rates are calculated as: + * + * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384) + */ +static ulong meson_mpll_get_rate(struct clk *clk, unsigned long id) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + struct parm *psdm, *pn2; + unsigned long sdm, n2; + unsigned long parent_rate; + uint reg; + + switch (id) { + case CLKID_MPLL0: + psdm = &meson_mpll0_parm[0]; + pn2 = &meson_mpll0_parm[1]; + break; + case CLKID_MPLL1: + psdm = &meson_mpll1_parm[0]; + pn2 = &meson_mpll1_parm[1]; + break; + case CLKID_MPLL2: + psdm = &meson_mpll2_parm[0]; + pn2 = &meson_mpll2_parm[1]; + break; + default: + return -ENOENT; + } + + parent_rate = meson_clk_get_rate_by_id(clk, CLKID_FIXED_PLL); + if (IS_ERR_VALUE(parent_rate)) + return parent_rate; + + regmap_read(priv->map, psdm->reg_off, ®); + sdm = PARM_GET(psdm->width, psdm->shift, reg); + + regmap_read(priv->map, pn2->reg_off, ®); + n2 = PARM_GET(pn2->width, pn2->shift, reg); + + return mpll_rate_from_params(parent_rate, sdm, n2); +} + +static struct parm meson_fixed_pll_parm[3] = { + {HHI_FIX_PLL_CNTL0, 0, 8}, /* pm */ + {HHI_FIX_PLL_CNTL0, 10, 5}, /* pn */ + {HHI_FIX_PLL_CNTL0, 16, 2}, /* pod */ +}; + +static struct parm meson_sys_pll_parm[3] = { + {HHI_SYS_PLL_CNTL0, 0, 8}, /* pm */ + {HHI_SYS_PLL_CNTL0, 10, 5}, /* pn */ + {HHI_SYS_PLL_CNTL0, 16, 2}, /* pod */ +}; + +static ulong meson_pll_get_rate(struct clk *clk, unsigned long id) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + struct parm *pm, *pn, *pod; + unsigned long parent_rate_mhz = XTAL_RATE / 1000000; + u16 n, m, od; + uint reg; + + /* + * FIXME: Between the unit conversion and the missing frac, we know + * rate will be slightly off ... + */ + + switch (id) { + case CLKID_FIXED_PLL: + pm = &meson_fixed_pll_parm[0]; + pn = &meson_fixed_pll_parm[1]; + pod = &meson_fixed_pll_parm[2]; + break; + case CLKID_SYS_PLL: + pm = &meson_sys_pll_parm[0]; + pn = &meson_sys_pll_parm[1]; + pod = &meson_sys_pll_parm[2]; + break; + default: + return -ENOENT; + } + + regmap_read(priv->map, pn->reg_off, ®); + n = PARM_GET(pn->width, pn->shift, reg); + + regmap_read(priv->map, pm->reg_off, ®); + m = PARM_GET(pm->width, pm->shift, reg); + + regmap_read(priv->map, pod->reg_off, ®); + od = PARM_GET(pod->width, pod->shift, reg); + + return ((parent_rate_mhz * m / n) >> od) * 1000000; +} + +static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id) +{ + ulong rate; + + switch (id) { + case CLKID_FIXED_PLL: + case CLKID_SYS_PLL: + rate = meson_pll_get_rate(clk, id); + break; + case CLKID_FCLK_DIV2: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 2; + break; + case CLKID_FCLK_DIV3: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 3; + break; + case CLKID_FCLK_DIV4: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 4; + break; + case CLKID_FCLK_DIV5: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 5; + break; + case CLKID_FCLK_DIV7: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 7; + break; + case CLKID_MPLL0: + case CLKID_MPLL1: + case CLKID_MPLL2: + rate = meson_mpll_get_rate(clk, id); + break; + case CLKID_CLK81: + rate = meson_clk81_get_rate(clk); + break; + default: + if (gates[id].reg != 0) { + /* a clock gate */ + rate = meson_clk81_get_rate(clk); + break; + } + return -ENOENT; + } + + debug("clock %lu has rate %lu\n", id, rate); + return rate; +} + +static ulong meson_clk_get_rate(struct clk *clk) +{ + return meson_clk_get_rate_by_id(clk, clk->id); +} + +static int meson_clk_probe(struct udevice *dev) +{ + struct meson_clk *priv = dev_get_priv(dev); + + priv->map = syscon_node_to_regmap(dev_get_parent(dev)->node); + if (IS_ERR(priv->map)) + return PTR_ERR(priv->map); + + debug("meson-clk-g12a: probed\n"); + + return 0; +} + +static struct clk_ops meson_clk_ops = { + .disable = meson_clk_disable, + .enable = meson_clk_enable, + .get_rate = meson_clk_get_rate, +}; + +static const struct udevice_id meson_clk_ids[] = { + { .compatible = "amlogic,g12a-clkc" }, + { } +}; + +U_BOOT_DRIVER(meson_clk_g12a) = { + .name = "meson_clk_g12a", + .id = UCLASS_CLK, + .of_match = meson_clk_ids, + .priv_auto_alloc_size = sizeof(struct meson_clk), + .ops = &meson_clk_ops, + .probe = meson_clk_probe, +}; |