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a=ed25519-sha256; t=1711980406; l=15843; i=j.neuschaefer@gmx.net; s=20240329; h=from:subject:message-id; bh=UPeEaga1J3UrtecMXMiI+BuPgg+EO1dTix3uUSMxUtA=; b=WSr9LGfIK22yrApFcMZvTG0JH8tV6sMSVGdbwVtKVJ9QZ8RA4qHhxrYSJN2PaO2fx3YpuF/XO /cBcuDVkjPnDpN9FXHaz7dQ7WhtFPkEvJC2py+HKDb+SUz6+7Yn0ed/ X-Developer-Key: i=j.neuschaefer@gmx.net; a=ed25519; pk=NIe0bK42wNaX/C4bi6ezm7NJK0IQE+8MKBm7igFMIS4= X-Provags-ID: V03:K1:O6tSXg1bixJjYBYRYi42XYA09hwB8IB03c3mYeKX8fc8XfNvsex tNG772Q5u5+wfidPfRzWO/mlCq5saxC5NXx9n7pbZ1BgXMitC159TK3ovN/y8tcpqEqbj3c KkBe9et1+81/mvsvh9Req4D4PFIo4/sJ3T9C43SKDiWXhNdI+HRw7FbEGHxbfzPe3QGUKhU 0CibwgA+QRVaFL9htwdsw== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:1QDU1+ubDig=;RdBSZG0T/5J0cErCtK6JklE/hTq BAHKVJL/3DJl7efBgBv7dqF1W+1bFalBF62wjLuiUXnczoc4TuCWr8XGgWJSeNuJgFbidhDwn 4gsg2rmzQ/MnRRyxuu6sZVue68OcKw2Mj+PPbzxdhbHLXZhpkbQIpQ6bUTlwwQkmDkPONrCd7 zsWfW6tkdJjF1MuCImvE4G/9rXv3VEFuIhcEOL4Kk7UxupiaQoHGwxt8qXpqNHJDwHR9oLVRw MPC2GwxF3qBUpJreiRq/CNsdTBCoO8qXSqA8Ad7xMvIAqZryID0cS4zZE2gMNk6oV8kXfWytU k/5JwadxMZ1OyTIn9UCtdbRl75gSSSfIZtuS3TAj3OeYc693Vx6DT1K92/STwkXlGc0ntHSQ1 dHsMwV3RhkKfqAOg3bnISO4z0Lx29nmgM+n2oIEs4j3MK8H0yHKw6rgQHpTnAiWJlpPxluS9S y0YRIswprzazxsjVFO8sohOmYIQ0fbiybu8HJH001nXpQJmjc3u7sdxAyApw5MHyr8A93eTbs hpaa6oX5ljsJBVMV9B5LzazX7um/Gua4vkyI70IA3Ap4s59642ZXL3RLX/Iuc8EyVc2uo1fzY HbGZGrBOlHkd4oNiwlIjKnlRz8lxWDNBBcUQNpSHYiUWvWuBiZt5GMY19c9KdNe73EQMtVpZZ DKRgZu1j1NdM37wpdEci64pYgTCvM0wM+3+QrlDaAj+57nHx0iQ/LTKBzdAkqRnhzaVgn08JG u2oPTGkQ2Fme94SrjOkqHWiallb2AJzDMDr0sQ5PtiB33eeXrc4PUHojs817h90SA1P3vHXVQ kTDDehTnjO5AWJyuAPZV3PZGB/dxLAKhBz4uii87dMJFGXs2pkvZ4gZRktzoI4ZQ70 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , Conor Dooley , Philipp Zabel , Stephen Boyd , Michael Turquette , linux-kernel@vger.kernel.org, =?utf-8?q?Jonathan_Neusch=C3=A4fer?= , Joel Stanley , Krzysztof Kozlowski Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" This driver implements the following features w.r.t. the clock and reset controller in the WPCM450 SoC: - It calculates the rates for all clocks managed by the clock controller - It leaves the clock tree mostly unchanged, except that it enables/ disables clock gates based on usage. - It exposes the reset lines managed by the controller using the Generic Reset Controller subsystem NOTE: If the driver and the corresponding devicetree node are present, the driver will disable "unused" clocks. This is problem until the clock relations are properly declared in the devicetree (in a later patch). Until then, the clk_ignore_unused kernel parameter can be used as a workaround. Signed-off-by: Jonathan Neuschäfer Reviewed-by: Joel Stanley --- I have considered converting this driver to a platform driver instead of using CLK_OF_DECLARE, because platform drivers are generally the way forward. However, the timer-npcm7xx driver used on the same platform requires is initialized with TIMER_OF_DECLARE and thus requires the clocks to be available earlier than a platform driver can provide them. v11: - no changes v10: - select RESET_{CONTROLLER,SIMPLE} from CLK_WPCM450 instead of messing with the 'default' statement v9: - Apply comments made by Stephen Boyd - Move to drivers/clk/nuvoton/ directory - Update SPDX license identifier from GPL-2.0 to GPL-2.0-only - Rename clk_np variable to np - Use of_clk_hw_register - Refer to clock parents by .fw_name v8: - https://lore.kernel.org/lkml/20230428190226.1304326-3-j.neuschaefer@gmx.net/ - Use %pe format specifier throughout the driver, as suggested by Philipp Zabel - Add Joel's R-b v7: - https://lore.kernel.org/lkml/20230422220240.322572-3-j.neuschaefer@gmx.net/ - Simplify error handling by not deallocating resources v6: - Enable RESET_SIMPLE based on ARCH_WPCM450, not ARCH_NPCM, as suggested by Tomer Maimon v5: - https://lore.kernel.org/lkml/20221104161850.2889894-6-j.neuschaefer@gmx.net/ - Switch to using clk_parent_data v4: - Fix reset controller initialization v3: - Change reference clock name from "refclk" to "ref" - Remove unused variable in return path of wpcm450_clk_register_pll - Remove unused divisor tables v2: - no changes --- drivers/clk/Makefile | 2 +- drivers/clk/nuvoton/Kconfig | 10 +- drivers/clk/nuvoton/Makefile | 1 + drivers/clk/nuvoton/clk-wpcm450.c | 372 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 383 insertions(+), 2 deletions(-) -- 2.43.0 diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 14fa8d4ecc1fbe..cdeb2ecf3a8e99 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -107,7 +107,7 @@ endif obj-y += mstar/ obj-y += mvebu/ obj-$(CONFIG_ARCH_MXS) += mxs/ -obj-$(CONFIG_ARCH_MA35) += nuvoton/ +obj-y += nuvoton/ obj-$(CONFIG_COMMON_CLK_NXP) += nxp/ obj-$(CONFIG_COMMON_CLK_PISTACHIO) += pistachio/ obj-$(CONFIG_COMMON_CLK_PXA) += pxa/ diff --git a/drivers/clk/nuvoton/Kconfig b/drivers/clk/nuvoton/Kconfig index fe4b7f62f46704..908881654b2e91 100644 --- a/drivers/clk/nuvoton/Kconfig +++ b/drivers/clk/nuvoton/Kconfig @@ -3,7 +3,7 @@ config COMMON_CLK_NUVOTON bool "Nuvoton clock controller common support" - depends on ARCH_MA35 || COMPILE_TEST + depends on ARCH_MA35 || ARCH_NPCM || COMPILE_TEST default y help Say y here to enable common clock controller for Nuvoton platforms. @@ -16,4 +16,12 @@ config CLK_MA35D1 help Build the clock controller driver for MA35D1 SoC. +config CLK_WPCM450 + bool "Nuvoton WPCM450 clock/reset controller support" + default y + select RESET_CONTROLLER + select RESET_SIMPLE + help + Build the clock and reset controller driver for the WPCM450 SoC. + endif diff --git a/drivers/clk/nuvoton/Makefile b/drivers/clk/nuvoton/Makefile index c3c59dd9f2aaab..b130f0d3889ca0 100644 --- a/drivers/clk/nuvoton/Makefile +++ b/drivers/clk/nuvoton/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_MA35D1) += clk-ma35d1.o obj-$(CONFIG_CLK_MA35D1) += clk-ma35d1-divider.o obj-$(CONFIG_CLK_MA35D1) += clk-ma35d1-pll.o +obj-$(CONFIG_CLK_WPCM450) += clk-wpcm450.o diff --git a/drivers/clk/nuvoton/clk-wpcm450.c b/drivers/clk/nuvoton/clk-wpcm450.c new file mode 100644 index 00000000000000..9100c4b8a56483 --- /dev/null +++ b/drivers/clk/nuvoton/clk-wpcm450.c @@ -0,0 +1,372 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Nuvoton WPCM450 clock and reset controller driver. + * + * Copyright (C) 2022 Jonathan Neuschäfer + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +struct wpcm450_clk_pll { + struct clk_hw hw; + void __iomem *pllcon; + u8 flags; +}; + +#define to_wpcm450_clk_pll(_hw) container_of(_hw, struct wpcm450_clk_pll, hw) + +#define PLLCON_FBDV GENMASK(24, 16) +#define PLLCON_PRST BIT(13) +#define PLLCON_PWDEN BIT(12) +#define PLLCON_OTDV GENMASK(10, 8) +#define PLLCON_INDV GENMASK(5, 0) + +static unsigned long wpcm450_clk_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct wpcm450_clk_pll *pll = to_wpcm450_clk_pll(hw); + unsigned long fbdv, indv, otdv; + u64 rate; + u32 pllcon; + + if (parent_rate == 0) + return 0; + + pllcon = readl_relaxed(pll->pllcon); + + indv = FIELD_GET(PLLCON_INDV, pllcon) + 1; + fbdv = FIELD_GET(PLLCON_FBDV, pllcon) + 1; + otdv = FIELD_GET(PLLCON_OTDV, pllcon) + 1; + + rate = (u64)parent_rate * fbdv; + do_div(rate, indv * otdv); + + return rate; +} + +static int wpcm450_clk_pll_is_enabled(struct clk_hw *hw) +{ + struct wpcm450_clk_pll *pll = to_wpcm450_clk_pll(hw); + u32 pllcon; + + pllcon = readl_relaxed(pll->pllcon); + + return !(pllcon & PLLCON_PRST); +} + +static void wpcm450_clk_pll_disable(struct clk_hw *hw) +{ + struct wpcm450_clk_pll *pll = to_wpcm450_clk_pll(hw); + u32 pllcon; + + pllcon = readl_relaxed(pll->pllcon); + pllcon |= PLLCON_PRST | PLLCON_PWDEN; + writel(pllcon, pll->pllcon); +} + +static const struct clk_ops wpcm450_clk_pll_ops = { + .recalc_rate = wpcm450_clk_pll_recalc_rate, + .is_enabled = wpcm450_clk_pll_is_enabled, + .disable = wpcm450_clk_pll_disable +}; + +static struct clk_hw * +wpcm450_clk_register_pll(struct device_node *np, void __iomem *pllcon, const char *name, + const struct clk_parent_data *parent, unsigned long flags) +{ + struct wpcm450_clk_pll *pll; + struct clk_init_data init = {}; + int ret; + + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (!pll) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &wpcm450_clk_pll_ops; + init.parent_data = parent; + init.num_parents = 1; + init.flags = flags; + + pll->pllcon = pllcon; + pll->hw.init = &init; + + ret = of_clk_hw_register(np, &pll->hw); + if (ret) { + kfree(pll); + return ERR_PTR(ret); + } + + return &pll->hw; +} + +#define REG_CLKEN 0x00 +#define REG_CLKSEL 0x04 +#define REG_CLKDIV 0x08 +#define REG_PLLCON0 0x0c +#define REG_PLLCON1 0x10 +#define REG_PMCON 0x14 +#define REG_IRQWAKECON 0x18 +#define REG_IRQWAKEFLAG 0x1c +#define REG_IPSRST 0x20 + +struct wpcm450_pll_data { + const char *name; + struct clk_parent_data parent; + unsigned int reg; + unsigned long flags; +}; + +static const struct wpcm450_pll_data pll_data[] = { + { "pll0", { .fw_name = "ref" }, REG_PLLCON0, 0 }, + { "pll1", { .fw_name = "ref" }, REG_PLLCON1, 0 }, +}; + +struct wpcm450_clksel_data { + const char *name; + const struct clk_parent_data *parents; + unsigned int num_parents; + const u32 *table; + int shift; + int width; + int index; + unsigned long flags; +}; + +static const u32 parent_table[] = { 0, 1, 2 }; + +static const struct clk_parent_data default_parents[] = { + { .name = "pll0" }, + { .name = "pll1" }, + { .name = "ref" }, +}; + +static const struct clk_parent_data huart_parents[] = { + { .fw_name = "ref" }, + { .name = "refdiv2" }, +}; + +static const struct wpcm450_clksel_data clksel_data[] = { + { "cpusel", default_parents, ARRAY_SIZE(default_parents), + parent_table, 0, 2, -1, CLK_IS_CRITICAL }, + { "clkout", default_parents, ARRAY_SIZE(default_parents), + parent_table, 2, 2, -1, 0 }, + { "usbphy", default_parents, ARRAY_SIZE(default_parents), + parent_table, 6, 2, -1, 0 }, + { "uartsel", default_parents, ARRAY_SIZE(default_parents), + parent_table, 8, 2, WPCM450_CLK_USBPHY, 0 }, + { "huartsel", huart_parents, ARRAY_SIZE(huart_parents), + parent_table, 10, 1, -1, 0 }, +}; + +static const struct clk_div_table div_fixed2[] = { + { .val = 0, .div = 2 }, + { } +}; + +struct wpcm450_clkdiv_data { + const char *name; + struct clk_parent_data parent; + int div_flags; + const struct clk_div_table *table; + int shift; + int width; + unsigned long flags; +}; + +static struct wpcm450_clkdiv_data clkdiv_data_early[] = { + { "refdiv2", { .name = "ref" }, 0, div_fixed2, 0, 0 }, +}; + +static const struct wpcm450_clkdiv_data clkdiv_data[] = { + { "cpu", { .name = "cpusel" }, 0, div_fixed2, 0, 0, CLK_IS_CRITICAL }, + { "adcdiv", { .name = "ref" }, CLK_DIVIDER_POWER_OF_TWO, NULL, 28, 2, 0 }, + { "apb", { .name = "ahb" }, CLK_DIVIDER_POWER_OF_TWO, NULL, 26, 2, 0 }, + { "ahb", { .name = "cpu" }, CLK_DIVIDER_POWER_OF_TWO, NULL, 24, 2, 0 }, + { "uart", { .name = "uartsel" }, 0, NULL, 16, 4, 0 }, + { "ahb3", { .name = "ahb" }, CLK_DIVIDER_POWER_OF_TWO, NULL, 8, 2, 0 }, +}; + +struct wpcm450_clken_data { + const char *name; + struct clk_parent_data parent; + int bitnum; + unsigned long flags; +}; + +static const struct wpcm450_clken_data clken_data[] = { + { "fiu", { .name = "ahb3" }, WPCM450_CLK_FIU, 0 }, + { "xbus", { .name = "ahb3" }, WPCM450_CLK_XBUS, 0 }, + { "kcs", { .name = "apb" }, WPCM450_CLK_KCS, 0 }, + { "shm", { .name = "ahb3" }, WPCM450_CLK_SHM, 0 }, + { "usb1", { .name = "ahb" }, WPCM450_CLK_USB1, 0 }, + { "emc0", { .name = "ahb" }, WPCM450_CLK_EMC0, 0 }, + { "emc1", { .name = "ahb" }, WPCM450_CLK_EMC1, 0 }, + { "usb0", { .name = "ahb" }, WPCM450_CLK_USB0, 0 }, + { "peci", { .name = "apb" }, WPCM450_CLK_PECI, 0 }, + { "aes", { .name = "apb" }, WPCM450_CLK_AES, 0 }, + { "uart0", { .name = "uart" }, WPCM450_CLK_UART0, 0 }, + { "uart1", { .name = "uart" }, WPCM450_CLK_UART1, 0 }, + { "smb2", { .name = "apb" }, WPCM450_CLK_SMB2, 0 }, + { "smb3", { .name = "apb" }, WPCM450_CLK_SMB3, 0 }, + { "smb4", { .name = "apb" }, WPCM450_CLK_SMB4, 0 }, + { "smb5", { .name = "apb" }, WPCM450_CLK_SMB5, 0 }, + { "huart", { .name = "huartsel" }, WPCM450_CLK_HUART, 0 }, + { "pwm", { .name = "apb" }, WPCM450_CLK_PWM, 0 }, + { "timer0", { .name = "refdiv2" }, WPCM450_CLK_TIMER0, 0 }, + { "timer1", { .name = "refdiv2" }, WPCM450_CLK_TIMER1, 0 }, + { "timer2", { .name = "refdiv2" }, WPCM450_CLK_TIMER2, 0 }, + { "timer3", { .name = "refdiv2" }, WPCM450_CLK_TIMER3, 0 }, + { "timer4", { .name = "refdiv2" }, WPCM450_CLK_TIMER4, 0 }, + { "mft0", { .name = "apb" }, WPCM450_CLK_MFT0, 0 }, + { "mft1", { .name = "apb" }, WPCM450_CLK_MFT1, 0 }, + { "wdt", { .name = "refdiv2" }, WPCM450_CLK_WDT, 0 }, + { "adc", { .name = "adcdiv" }, WPCM450_CLK_ADC, 0 }, + { "sdio", { .name = "ahb" }, WPCM450_CLK_SDIO, 0 }, + { "sspi", { .name = "apb" }, WPCM450_CLK_SSPI, 0 }, + { "smb0", { .name = "apb" }, WPCM450_CLK_SMB0, 0 }, + { "smb1", { .name = "apb" }, WPCM450_CLK_SMB1, 0 }, +}; + +static DEFINE_SPINLOCK(wpcm450_clk_lock); + +/* + * NOTE: Error handling is very rudimentary here. If the clock driver initial- + * ization fails, the system is probably in bigger trouble than what is caused + * by a few leaked resources. + */ + +static void __init wpcm450_clk_init(struct device_node *np) +{ + struct clk_hw_onecell_data *clk_data; + static struct clk_hw **hws; + static struct clk_hw *hw; + void __iomem *clk_base; + int i, ret; + struct reset_simple_data *reset; + + clk_base = of_iomap(np, 0); + if (!clk_base) { + pr_err("%pOFP: failed to map registers\n", np); + of_node_put(np); + return; + } + of_node_put(np); + + clk_data = kzalloc(struct_size(clk_data, hws, WPCM450_NUM_CLKS), GFP_KERNEL); + if (!clk_data) + return; + + clk_data->num = WPCM450_NUM_CLKS; + hws = clk_data->hws; + + for (i = 0; i < WPCM450_NUM_CLKS; i++) + hws[i] = ERR_PTR(-ENOENT); + + /* PLLs */ + for (i = 0; i < ARRAY_SIZE(pll_data); i++) { + const struct wpcm450_pll_data *data = &pll_data[i]; + + hw = wpcm450_clk_register_pll(np, clk_base + data->reg, data->name, + &data->parent, data->flags); + if (IS_ERR(hw)) { + pr_info("Failed to register PLL: %pe\n", hw); + return; + } + } + + /* Early divisors (REF/2) */ + for (i = 0; i < ARRAY_SIZE(clkdiv_data_early); i++) { + const struct wpcm450_clkdiv_data *data = &clkdiv_data_early[i]; + + hw = clk_hw_register_divider_table_parent_data(NULL, data->name, &data->parent, + data->flags, clk_base + REG_CLKDIV, + data->shift, data->width, + data->div_flags, data->table, + &wpcm450_clk_lock); + if (IS_ERR(hw)) { + pr_err("Failed to register div table: %pe\n", hw); + return; + } + } + + /* Selects/muxes */ + for (i = 0; i < ARRAY_SIZE(clksel_data); i++) { + const struct wpcm450_clksel_data *data = &clksel_data[i]; + + hw = clk_hw_register_mux_parent_data(NULL, data->name, data->parents, + data->num_parents, data->flags, + clk_base + REG_CLKSEL, data->shift, + data->width, 0, + &wpcm450_clk_lock); + if (IS_ERR(hw)) { + pr_err("Failed to register mux: %pe\n", hw); + return; + } + if (data->index >= 0) + clk_data->hws[data->index] = hw; + } + + /* Divisors */ + for (i = 0; i < ARRAY_SIZE(clkdiv_data); i++) { + const struct wpcm450_clkdiv_data *data = &clkdiv_data[i]; + + hw = clk_hw_register_divider_table_parent_data(NULL, data->name, &data->parent, + data->flags, clk_base + REG_CLKDIV, + data->shift, data->width, + data->div_flags, data->table, + &wpcm450_clk_lock); + if (IS_ERR(hw)) { + pr_err("Failed to register divider: %pe\n", hw); + return; + } + } + + /* Enables/gates */ + for (i = 0; i < ARRAY_SIZE(clken_data); i++) { + const struct wpcm450_clken_data *data = &clken_data[i]; + + hw = clk_hw_register_gate_parent_data(NULL, data->name, &data->parent, data->flags, + clk_base + REG_CLKEN, data->bitnum, + data->flags, &wpcm450_clk_lock); + if (IS_ERR(hw)) { + pr_err("Failed to register gate: %pe\n", hw); + return; + } + clk_data->hws[data->bitnum] = hw; + } + + ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_data); + if (ret) + pr_err("Failed to add DT provider: %pe\n", ERR_PTR(ret)); + + /* Reset controller */ + reset = kzalloc(sizeof(*reset), GFP_KERNEL); + if (!reset) + return; + reset->rcdev.owner = THIS_MODULE; + reset->rcdev.nr_resets = WPCM450_NUM_RESETS; + reset->rcdev.ops = &reset_simple_ops; + reset->rcdev.of_node = np; + reset->membase = clk_base + REG_IPSRST; + ret = reset_controller_register(&reset->rcdev); + if (ret) + pr_err("Failed to register reset controller: %pe\n", ERR_PTR(ret)); + + of_node_put(np); +} + +CLK_OF_DECLARE(wpcm450_clk_init, "nuvoton,wpcm450-clk", wpcm450_clk_init);