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dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Received: by mail.gandi.net (Postfix) with ESMTPSA id 1763C1C000B; Wed, 10 Apr 2024 17:12:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1712769156; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=F3BqGEUn2EmB2IwhPjvDlmPWipGAcZkNTnmyUxCGE3o=; b=OeQYQyurEe0wdA5JCyKiAcgm5pO40eJaXH/qaEO9RX2B/L8ZFHAkqALehBajIFWoCWVebX 0y46BqtA5Y+BwJN/JrQq5PDyF3tkyPusKCkIgG2FbbYWOsByzg0gFSDmPCPVlKJJFuIdX+ 3sg7ViUfBGoQ83zbiWbbg6ZBDUT+wrGv80aN28SXPpFGLxQfR1smJGl3hWsG+8baH8aGuz mavVkFhtSmrnsEN/5E9nz+BSC17SH9ixXf8aB128wG9phDjKzOpyFQJmU/8sI1u6Y31IcH 81baQYS3o+YMrp5grvs6u/ZAPJEtWddZUf28CRAF4gsQK2RWEZqG6mX+ux3zZw== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Wed, 10 Apr 2024 19:12:34 +0200 Subject: [PATCH 05/11] clk: eyeq: add driver Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240410-mbly-olb-v1-5-335e496d7be3@bootlin.com> References: <20240410-mbly-olb-v1-0-335e496d7be3@bootlin.com> In-Reply-To: <20240410-mbly-olb-v1-0-335e496d7be3@bootlin.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Turquette , Stephen Boyd , Philipp Zabel , Linus Walleij Cc: linux-mips@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, Vladimir Kondratiev , Gregory CLEMENT , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.13.0 X-GND-Sasl: theo.lebrun@bootlin.com Add Mobileye EyeQ5, EyeQ6L and EyeQ6H clock controller driver. It is both a platform driver and a hook onto of_clk_init() used for clocks required early (GIC timer, UARTs). For some compatible, it is both at the same time. eqc_init() initialises early PLLs and stores clock array in a static linked list. It marks other clocks as deferred. eqc_probe() retrieves the clock array and adds all remaining clocks. It exposes read-only PLLs derived from the main crystal on board. It also exposes another type of clocks: divider clocks. They always have even divisors and have one PLL as parent. Signed-off-by: Théo Lebrun --- MAINTAINERS | 1 + drivers/clk/Kconfig | 11 + drivers/clk/Makefile | 1 + drivers/clk/clk-eyeq.c | 644 +++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 657 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 42553da10be9..33168ebf3cc5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14932,6 +14932,7 @@ F: Documentation/devicetree/bindings/soc/mobileye/ F: arch/mips/boot/dts/mobileye/ F: arch/mips/configs/eyeq5_defconfig F: arch/mips/mobileye/board-epm5.its.S +F: drivers/clk/clk-eyeq5.c F: include/dt-bindings/clock/mobileye,eyeq5-clk.h MODULE SUPPORT diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 50af5fc7f570..1eb6e70977a3 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -218,6 +218,17 @@ config COMMON_CLK_EN7523 This driver provides the fixed clocks and gates present on Airoha ARM silicon. +config COMMON_CLK_EYEQ + bool "Clock driver for the Mobileye EyeQ platform" + depends on OF || COMPILE_TEST + depends on MACH_EYEQ5 || MACH_EYEQ6H || COMPILE_TEST + default MACH_EYEQ5 || MACH_EYEQ6H + help + This driver provides clocks found on Mobileye EyeQ5, EyeQ6L and Eye6H + SoCs. Controllers live in shared register regions called OLB. Driver + provides read-only PLLs, derived from the main crystal clock (which + must be constant). It also exposes some divider clocks. + config COMMON_CLK_FSL_FLEXSPI tristate "Clock driver for FlexSPI on Layerscape SoCs" depends on ARCH_LAYERSCAPE || COMPILE_TEST diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 14fa8d4ecc1f..52de92309aa8 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -32,6 +32,7 @@ obj-$(CONFIG_ARCH_CLPS711X) += clk-clps711x.o obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o obj-$(CONFIG_ARCH_SPARX5) += clk-sparx5.o obj-$(CONFIG_COMMON_CLK_EN7523) += clk-en7523.o +obj-$(CONFIG_COMMON_CLK_EYEQ) += clk-eyeq.o obj-$(CONFIG_COMMON_CLK_FIXED_MMIO) += clk-fixed-mmio.o obj-$(CONFIG_COMMON_CLK_FSL_FLEXSPI) += clk-fsl-flexspi.o obj-$(CONFIG_COMMON_CLK_FSL_SAI) += clk-fsl-sai.o diff --git a/drivers/clk/clk-eyeq.c b/drivers/clk/clk-eyeq.c new file mode 100644 index 000000000000..bb2535010ae6 --- /dev/null +++ b/drivers/clk/clk-eyeq.c @@ -0,0 +1,644 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PLL clock driver for the Mobileye EyeQ5, EyeQ6L and EyeQ6H platforms. + * + * This controller handles read-only PLLs, all derived from the same main + * crystal clock. It also exposes divider clocks, those are children to PLLs. + * Parent clock is expected to be constant. This driver's registers live in + * a shared region called OLB. Some PLLs are initialised early by of_clk_init(). + * + * We use eqc_ as prefix, as-in "EyeQ Clock", but way shorter. + * + * Copyright (C) 2024 Mobileye Vision Technologies Ltd. + */ + +#define pr_fmt(fmt) "clk-eyeq: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define EQC_MAX_DIV_COUNT 4 + +/* In frac mode, it enables fractional noise canceling DAC. Else, no function. */ +#define PCSR0_DAC_EN BIT(0) +/* Fractional or integer mode */ +#define PCSR0_DSM_EN BIT(1) +#define PCSR0_PLL_EN BIT(2) +/* All clocks output held at 0 */ +#define PCSR0_FOUTPOSTDIV_EN BIT(3) +#define PCSR0_POST_DIV1 GENMASK(6, 4) +#define PCSR0_POST_DIV2 GENMASK(9, 7) +#define PCSR0_REF_DIV GENMASK(15, 10) +#define PCSR0_INTIN GENMASK(27, 16) +#define PCSR0_BYPASS BIT(28) +/* Bits 30..29 are reserved */ +#define PCSR0_PLL_LOCKED BIT(31) + +#define PCSR1_RESET BIT(0) +#define PCSR1_SSGC_DIV GENMASK(4, 1) +/* Spread amplitude (% = 0.1 * SPREAD[4:0]) */ +#define PCSR1_SPREAD GENMASK(9, 5) +#define PCSR1_DIS_SSCG BIT(10) +/* Down-spread or center-spread */ +#define PCSR1_DOWN_SPREAD BIT(11) +#define PCSR1_FRAC_IN GENMASK(31, 12) + +/* + * Driver might register clock provider from eqc_init() if PLLs are required + * early (before platform bus is ready). Store struct eqc_priv inside linked + * list to pass clock provider from eqc_init() to eqc_probe() and register + * remaining clocks from platform device probe. + * + * Clock provider is NOT created by eqc_init() if no early clock is required. + * Store as linked list because EyeQ6H has multiple clock controller instances. + * Matching is done based on devicetree node pointer. + */ +static DEFINE_SPINLOCK(eqc_list_slock); +static LIST_HEAD(eqc_list); + +struct eqc_pll { + unsigned int index; + const char *name; + u32 reg64; +}; + +/* + * Divider clock. Divider is 2*(v+1), with v the register value. + * Min divider is 2, max is 2*(2^width). + */ +struct eqc_div { + unsigned int index; + const char *name; + unsigned int parent; + const char *resource_name; + u8 shift; + u8 width; +}; + +struct eqc_match_data { + unsigned int early_pll_count; + const struct eqc_pll *early_plls; + + unsigned int pll_count; + const struct eqc_pll *plls; + + unsigned int div_count; + const struct eqc_div *divs; +}; + +struct eqc_priv { + struct clk_hw_onecell_data *cells; + const struct eqc_match_data *data; + void __iomem *base_plls; + struct device_node *np; + struct list_head list; +}; + +static int eqc_pll_parse_registers(u32 r0, u32 r1, unsigned long *mult, + unsigned long *div, unsigned long *acc) +{ + if (r0 & PCSR0_BYPASS) { + *mult = 1; + *div = 1; + *acc = 0; + return 0; + } + + if (!(r0 & PCSR0_PLL_LOCKED)) + return -EINVAL; + + *mult = FIELD_GET(PCSR0_INTIN, r0); + *div = FIELD_GET(PCSR0_REF_DIV, r0); + if (r0 & PCSR0_FOUTPOSTDIV_EN) + *div *= FIELD_GET(PCSR0_POST_DIV1, r0) * FIELD_GET(PCSR0_POST_DIV2, r0); + + /* Fractional mode, in 2^20 (0x100000) parts. */ + if (r0 & PCSR0_DSM_EN) { + *div *= 0x100000; + *mult = *mult * 0x100000 + FIELD_GET(PCSR1_FRAC_IN, r1); + } + + if (!*mult || !*div) + return -EINVAL; + + /* Spread spectrum. */ + if (!(r1 & (PCSR1_RESET | PCSR1_DIS_SSCG))) { + /* + * Spread is 1/1000 parts of frequency, accuracy is half of + * that. To get accuracy, convert to ppb (parts per billion). + */ + u32 spread = FIELD_GET(PCSR1_SPREAD, r1); + + *acc = spread * 500000; + if (r1 & PCSR1_DOWN_SPREAD) { + /* + * Downspreading: the central frequency is half a + * spread lower. + */ + *mult *= 2000 - spread; + *div *= 2000; + } + } else { + *acc = 0; + } + + return 0; +} + +static unsigned int eqc_compute_clock_count(const struct eqc_match_data *data) +{ + unsigned int i, nb_clks = 0; + + for (i = 0; i < data->early_pll_count; i++) + if (data->early_plls[i].index >= nb_clks) + nb_clks = data->early_plls[i].index + 1; + for (i = 0; i < data->pll_count; i++) + if (data->plls[i].index >= nb_clks) + nb_clks = data->plls[i].index + 1; + for (i = 0; i < data->div_count; i++) + if (data->divs[i].index >= nb_clks) + nb_clks = data->divs[i].index + 1; + + /* We expect the biggest clock index to be 1 below the clock count. */ + WARN_ON(nb_clks != data->early_pll_count + data->pll_count + data->div_count); + + return nb_clks; +} + +static int eqc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + void __iomem *div_resources[EQC_MAX_DIV_COUNT]; + struct device_node *np = dev->of_node; + const struct eqc_match_data *data; + struct eqc_priv *priv = NULL; + struct clk_hw *hw; + unsigned int i; + + data = device_get_match_data(dev); + if (!data) + return -ENODEV; + + if (data->early_pll_count) { + /* Device got inited early. Retrieve clock provider from list. */ + struct eqc_priv *entry; + + spin_lock(&eqc_list_slock); + list_for_each_entry(entry, &eqc_list, list) { + if (entry->np == np) { + priv = entry; + break; + } + } + spin_unlock(&eqc_list_slock); + + if (!priv) + return -ENODEV; + } else { + /* Device did NOT get init early. Do it now. */ + unsigned int nb_clks; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->np = np; + priv->data = data; + + nb_clks = eqc_compute_clock_count(data); + priv->cells = devm_kzalloc(dev, struct_size(priv->cells, hws, nb_clks), + GFP_KERNEL); + if (!priv->cells) + return -ENOMEM; + + priv->cells->num = nb_clks; + + /* + * We expect named resources if divider clocks are present. + * Else, we only expect one resource. + */ + if (data->div_count) + priv->base_plls = devm_platform_ioremap_resource_byname(pdev, "plls"); + else + priv->base_plls = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base_plls)) + return PTR_ERR(priv->base_plls); + } + + for (i = 0; i < data->pll_count; i++) { + const struct eqc_pll *pll = &data->plls[i]; + unsigned long mult, div, acc; + u32 r0, r1; + u64 val; + int ret; + + val = readq(priv->base_plls + pll->reg64); + r0 = val; + r1 = val >> 32; + + ret = eqc_pll_parse_registers(r0, r1, &mult, &div, &acc); + if (ret) { + dev_warn(dev, "failed parsing state of %s\n", pll->name); + priv->cells->hws[pll->index] = ERR_PTR(ret); + continue; + } + + hw = clk_hw_register_fixed_factor_with_accuracy_fwname(dev, + dev->of_node, pll->name, "ref", 0, mult, div, acc); + priv->cells->hws[pll->index] = hw; + if (IS_ERR(hw)) + dev_warn(dev, "failed registering %s: %pe\n", pll->name, hw); + } + + BUG_ON(ARRAY_SIZE(div_resources) < data->div_count); + + for (i = 0; i < data->div_count; i++) { + const struct eqc_div *div = &data->divs[i]; + void __iomem *base = NULL; + struct clk_hw *parent; + unsigned int j; + + /* + * Multiple divider clocks can request the same resource. Store + * resource pointers during probe(). For each divider clock, + * check if previous clocks referenced the same resource name. + * + * See EQ6HC_SOUTH_DIV_OSPI_REF and EQ6HC_SOUTH_DIV_OSPI_SYS. + */ + for (j = 0; j < i; j++) { + if (strcmp(data->divs[j].resource_name, div->resource_name) == 0) { + base = div_resources[j]; + break; + } + } + + /* Resource is first encountered. */ + if (!base) { + base = devm_platform_ioremap_resource_byname(pdev, div->resource_name); + if (IS_ERR(base)) { + dev_warn(dev, "failed to iomap resource for %s\n", div->name); + priv->cells->hws[div->index] = base; + continue; + } + } + + div_resources[i] = base; + + parent = priv->cells->hws[div->parent]; + hw = clk_hw_register_divider_table_parent_hw(dev, div->name, + parent, 0, base, div->shift, div->width, + CLK_DIVIDER_EVEN_INTEGERS, NULL, NULL); + priv->cells->hws[div->index] = hw; + if (IS_ERR(hw)) + dev_warn(dev, "failed registering %s: %pe\n", + div->name, hw); + } + + /* Clock provider has not been registered by eqc_init(). Do it now. */ + if (data->early_pll_count == 0) { + /* When providing a single clock, require no cell. */ + if (priv->cells->num == 1) + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, + priv->cells->hws); + else + return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, + priv->cells); + } + + return 0; +} + +/* Required early for GIC timer (pll-cpu) and UARTs (pll-per). */ +static const struct eqc_pll eqc_eyeq5_early_plls[] = { + { .index = EQ5C_PLL_CPU, .name = "pll-cpu", .reg64 = 0x00, }, + { .index = EQ5C_PLL_PER, .name = "pll-per", .reg64 = 0x30, }, +}; + +static const struct eqc_pll eqc_eyeq5_plls[] = { + { .index = EQ5C_PLL_VMP, .name = "pll-vmp", .reg64 = 0x08, }, + { .index = EQ5C_PLL_PMA, .name = "pll-pma", .reg64 = 0x10, }, + { .index = EQ5C_PLL_VDI, .name = "pll-vdi", .reg64 = 0x18, }, + { .index = EQ5C_PLL_DDR0, .name = "pll-ddr0", .reg64 = 0x20, }, + { .index = EQ5C_PLL_PCI, .name = "pll-pci", .reg64 = 0x28, }, + { .index = EQ5C_PLL_PMAC, .name = "pll-pmac", .reg64 = 0x38, }, + { .index = EQ5C_PLL_MPC, .name = "pll-mpc", .reg64 = 0x40, }, + { .index = EQ5C_PLL_DDR1, .name = "pll-ddr1", .reg64 = 0x48, }, +}; + +static const struct eqc_div eqc_eyeq5_divs[] = { + { + .index = EQ5C_DIV_OSPI, + .name = "div-ospi", + .parent = EQ5C_PLL_PER, + .resource_name = "ospi", + .shift = 0, + .width = 4, + }, +}; + +static const struct eqc_match_data eqc_eyeq5_match_data = { + .early_pll_count = ARRAY_SIZE(eqc_eyeq5_early_plls), + .early_plls = eqc_eyeq5_early_plls, + + .pll_count = ARRAY_SIZE(eqc_eyeq5_plls), + .plls = eqc_eyeq5_plls, + + .div_count = ARRAY_SIZE(eqc_eyeq5_divs), + .divs = eqc_eyeq5_divs, +}; + +static const struct eqc_pll eqc_eyeq6l_plls[] = { + { .index = EQ6LC_PLL_DDR, .name = "pll-ddr", .reg64 = 0x2C }, + { .index = EQ6LC_PLL_CPU, .name = "pll-cpu", .reg64 = 0x34 }, /* also acc */ + { .index = EQ6LC_PLL_PER, .name = "pll-per", .reg64 = 0x3C }, + { .index = EQ6LC_PLL_VDI, .name = "pll-vdi", .reg64 = 0x44 }, +}; + +static const struct eqc_match_data eqc_eyeq6l_match_data = { + .pll_count = ARRAY_SIZE(eqc_eyeq6l_plls), + .plls = eqc_eyeq6l_plls, +}; + +/* Required early for GIC timer. */ +static const struct eqc_pll eqc_eyeq6h_central_early_plls[] = { + { .index = 0, .name = "pll-cpu", .reg64 = 0x00 }, +}; + +static const struct eqc_match_data eqc_eyeq6h_central_match_data = { + .early_pll_count = ARRAY_SIZE(eqc_eyeq6h_central_early_plls), + .early_plls = eqc_eyeq6h_central_early_plls, +}; + +/* Required early for UART. */ +static const struct eqc_pll eqc_eyeq6h_west_early_plls[] = { + { .index = 0, .name = "pll-west", .reg64 = 0x00 }, +}; + +static const struct eqc_match_data eqc_eyeq6h_west_match_data = { + .early_pll_count = ARRAY_SIZE(eqc_eyeq6h_west_early_plls), + .early_plls = eqc_eyeq6h_west_early_plls, +}; + +static const struct eqc_pll eqc_eyeq6h_east_plls[] = { + { .index = 0, .name = "pll-east", .reg64 = 0x00 }, +}; + +static const struct eqc_match_data eqc_eyeq6h_east_match_data = { + .pll_count = ARRAY_SIZE(eqc_eyeq6h_east_plls), + .plls = eqc_eyeq6h_east_plls, +}; + +static const struct eqc_pll eqc_eyeq6h_south_plls[] = { + { .index = EQ6HC_SOUTH_PLL_VDI, .name = "pll-vdi", .reg64 = 0x00 }, + { .index = EQ6HC_SOUTH_PLL_PCIE, .name = "pll-pcie", .reg64 = 0x08 }, + { .index = EQ6HC_SOUTH_PLL_PER, .name = "pll-per", .reg64 = 0x10 }, + { .index = EQ6HC_SOUTH_PLL_ISP, .name = "pll-isp", .reg64 = 0x18 }, +}; + +static const struct eqc_div eqc_eyeq6h_south_divs[] = { + { + .index = EQ6HC_SOUTH_DIV_EMMC, + .name = "div-emmc", + .parent = EQ6HC_SOUTH_PLL_PER, + .resource_name = "emmc", + .shift = 4, + .width = 4, + }, + { + .index = EQ6HC_SOUTH_DIV_OSPI_REF, + .name = "div-ospi-ref", + .parent = EQ6HC_SOUTH_PLL_PER, + .resource_name = "ospi", + .shift = 4, + .width = 4, + }, + { + .index = EQ6HC_SOUTH_DIV_OSPI_SYS, + .name = "div-ospi-sys", + .parent = EQ6HC_SOUTH_PLL_PER, + .resource_name = "ospi", + .shift = 8, + .width = 1, + }, + { + .index = EQ6HC_SOUTH_DIV_TSU, + .name = "div-tsu", + .parent = EQ6HC_SOUTH_PLL_PCIE, + .resource_name = "tsu", + .shift = 4, + .width = 8, + }, +}; + +static const struct eqc_match_data eqc_eyeq6h_south_match_data = { + .pll_count = ARRAY_SIZE(eqc_eyeq6h_south_plls), + .plls = eqc_eyeq6h_south_plls, + + .div_count = ARRAY_SIZE(eqc_eyeq6h_south_divs), + .divs = eqc_eyeq6h_south_divs, +}; + +static const struct eqc_pll eqc_eyeq6h_ddr0_plls[] = { + { .index = 0, .name = "pll-ddr0", .reg64 = 0x00 }, +}; + +static const struct eqc_match_data eqc_eyeq6h_ddr0_match_data = { + .pll_count = ARRAY_SIZE(eqc_eyeq6h_ddr0_plls), + .plls = eqc_eyeq6h_ddr0_plls, +}; + +static const struct eqc_pll eqc_eyeq6h_ddr1_plls[] = { + { .index = 0, .name = "pll-ddr1", .reg64 = 0x00 }, +}; + +static const struct eqc_match_data eqc_eyeq6h_ddr1_match_data = { + .pll_count = ARRAY_SIZE(eqc_eyeq6h_ddr1_plls), + .plls = eqc_eyeq6h_ddr1_plls, +}; + +static const struct eqc_pll eqc_eyeq6h_acc_plls[] = { + { .index = EQ6HC_ACC_PLL_XNN, .name = "pll-xnn", .reg64 = 0x00 }, + { .index = EQ6HC_ACC_PLL_VMP, .name = "pll-vmp", .reg64 = 0x10 }, + { .index = EQ6HC_ACC_PLL_PMA, .name = "pll-pma", .reg64 = 0x1C }, + { .index = EQ6HC_ACC_PLL_MPC, .name = "pll-mpc", .reg64 = 0x28 }, + { .index = EQ6HC_ACC_PLL_NOC, .name = "pll-noc", .reg64 = 0x30 }, +}; + +static const struct eqc_match_data eqc_eyeq6h_acc_match_data = { + .pll_count = ARRAY_SIZE(eqc_eyeq6h_acc_plls), + .plls = eqc_eyeq6h_acc_plls, +}; + +static const struct of_device_id eqc_match_table[] = { + { .compatible = "mobileye,eyeq5-clk", .data = &eqc_eyeq5_match_data }, + { .compatible = "mobileye,eyeq6l-clk", .data = &eqc_eyeq6l_match_data }, + { .compatible = "mobileye,eyeq6h-central-clk", .data = &eqc_eyeq6h_central_match_data }, + { .compatible = "mobileye,eyeq6h-west-clk", .data = &eqc_eyeq6h_west_match_data }, + { .compatible = "mobileye,eyeq6h-east-clk", .data = &eqc_eyeq6h_east_match_data }, + { .compatible = "mobileye,eyeq6h-south-clk", .data = &eqc_eyeq6h_south_match_data }, + { .compatible = "mobileye,eyeq6h-ddr0-clk", .data = &eqc_eyeq6h_ddr0_match_data }, + { .compatible = "mobileye,eyeq6h-ddr1-clk", .data = &eqc_eyeq6h_ddr1_match_data }, + { .compatible = "mobileye,eyeq6h-acc-clk", .data = &eqc_eyeq6h_acc_match_data }, + {} +}; +MODULE_DEVICE_TABLE(of, eqc_match_table); + +static struct platform_driver eqc_driver = { + .probe = eqc_probe, + .driver = { + .name = "clk-eyeq", + .of_match_table = eqc_match_table, + }, +}; +builtin_platform_driver(eqc_driver); + +static void __init eqc_init(struct device_node *np) +{ + const struct eqc_match_data *data; + unsigned int nb_clks = 0; + struct eqc_priv *priv; + unsigned int i; + int ret; + + data = of_match_node(eqc_match_table, np)->data; + + /* No reason to early init this clock provider. Do it at probe. */ + if (data->early_pll_count == 0) + return; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) { + ret = -ENOMEM; + goto err; + } + + priv->np = np; + priv->data = data; + + nb_clks = eqc_compute_clock_count(data); + priv->cells = kzalloc(struct_size(priv->cells, hws, nb_clks), GFP_KERNEL); + if (!priv->cells) { + ret = -ENOMEM; + goto err; + } + + priv->cells->num = nb_clks; + + /* + * Mark non-early clocks as deferred; they'll be registered at platform + * device probe. + */ + for (i = 0; i < data->pll_count; i++) + priv->cells->hws[data->plls[i].index] = ERR_PTR(-EPROBE_DEFER); + for (i = 0; i < data->div_count; i++) + priv->cells->hws[data->divs[i].index] = ERR_PTR(-EPROBE_DEFER); + + /* + * We expect named resources if divider clocks are present. + * Else, we only expect one resource. + */ + if (data->div_count) + ret = of_property_match_string(np, "reg-names", "plls"); + else + ret = 0; + if (ret < 0) + goto err; + + priv->base_plls = of_iomap(np, ret); + if (!priv->base_plls) { + ret = -ENODEV; + goto err; + } + + for (i = 0; i < data->early_pll_count; i++) { + const struct eqc_pll *pll = &data->early_plls[i]; + unsigned long mult, div, acc; + struct clk_hw *hw; + u32 r0, r1; + u64 val; + + val = readq(priv->base_plls + pll->reg64); + r0 = val; + r1 = val >> 32; + + ret = eqc_pll_parse_registers(r0, r1, &mult, &div, &acc); + if (ret) { + pr_err("failed parsing state of %s\n", pll->name); + goto err; + } + + hw = clk_hw_register_fixed_factor_with_accuracy_fwname(NULL, + np, pll->name, "ref", 0, mult, div, acc); + priv->cells->hws[pll->index] = hw; + if (IS_ERR(hw)) { + pr_err("failed registering %s: %pe\n", pll->name, hw); + ret = PTR_ERR(hw); + goto err; + } + } + + /* When providing a single clock, require no cell. */ + if (nb_clks == 1) + ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, priv->cells->hws); + else + ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, priv->cells); + if (ret) { + pr_err("failed registering clk provider: %d\n", ret); + goto err; + } + + spin_lock(&eqc_list_slock); + list_add_tail(&priv->list, &eqc_list); + spin_unlock(&eqc_list_slock); + + return; + +err: + /* + * We are doomed. The system will not be able to boot. + * + * Let's still try to be good citizens by freeing resources and print + * a last error message that might help debugging. + */ + + if (priv && priv->cells) { + of_clk_del_provider(np); + + for (i = 0; i < data->early_pll_count; i++) { + const struct eqc_pll *pll = &data->early_plls[i]; + struct clk_hw *hw = priv->cells->hws[pll->index]; + + if (!IS_ERR_OR_NULL(hw)) + clk_hw_unregister_fixed_factor(hw); + } + + kfree(priv->cells); + } + + kfree(priv); + + pr_err("failed clk init: %d\n", ret); +} + +CLK_OF_DECLARE_DRIVER(eqc_eyeq5, "mobileye,eyeq5-clk", eqc_init); +CLK_OF_DECLARE_DRIVER(eqc_eyeq6h_central, "mobileye,eyeq6h-central-clk", eqc_init); +CLK_OF_DECLARE_DRIVER(eqc_eyeq6h_west, "mobileye,eyeq6h-west-clk", eqc_init);