| Message ID | 20230422220240.322572-3-j.neuschaefer@gmx.net (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Nuvoton WPCM450 clock and reset driver | expand |
On Sat, 22 Apr 2023 at 22:05, Jonathan Neuschäfer <j.neuschaefer@gmx.net> wrote: > > 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 <j.neuschaefer@gmx.net> Reviewed-by: Joel Stanley <joel@jms.id.au> > --- > > v7: > - 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: > - https://lore.kernel.org/lkml/20220610072141.347795-6-j.neuschaefer@gmx.net/ > - Fix reset controller initialization > > v3: > - https://lore.kernel.org/lkml/20220508194333.2170161-7-j.neuschaefer@gmx.net/ > - Change reference clock name from "refclk" to "ref" > - Remove unused variable in return path of wpcm450_clk_register_pll > - Remove unused divisor tables > > v2: > - https://lore.kernel.org/lkml/20220429172030.398011-7-j.neuschaefer@gmx.net/ > - no changes > --- > drivers/clk/Makefile | 1 + > drivers/clk/clk-wpcm450.c | 374 ++++++++++++++++++++++++++++++++++++++ > drivers/reset/Kconfig | 2 +- > 3 files changed, 376 insertions(+), 1 deletion(-) > create mode 100644 drivers/clk/clk-wpcm450.c > > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile > index e3ca0d058a256..b58352d4d615d 100644 > --- a/drivers/clk/Makefile > +++ b/drivers/clk/Makefile > @@ -75,6 +75,7 @@ obj-$(CONFIG_COMMON_CLK_RS9_PCIE) += clk-renesas-pcie.o > obj-$(CONFIG_COMMON_CLK_VC5) += clk-versaclock5.o > obj-$(CONFIG_COMMON_CLK_VC7) += clk-versaclock7.o > obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o > +obj-$(CONFIG_ARCH_WPCM450) += clk-wpcm450.o > obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o > > # please keep this section sorted lexicographically by directory path name > diff --git a/drivers/clk/clk-wpcm450.c b/drivers/clk/clk-wpcm450.c > new file mode 100644 > index 0000000000000..6f6d8a1ea3484 > --- /dev/null > +++ b/drivers/clk/clk-wpcm450.c > @@ -0,0 +1,374 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Nuvoton WPCM450 clock and reset controller driver. > + * > + * Copyright (C) 2022 Jonathan Neuschäfer <j.neuschaefer@gmx.net> > + */ > + > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > + > +#include <linux/bitfield.h> > +#include <linux/clk-provider.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/reset-controller.h> > +#include <linux/reset/reset-simple.h> > +#include <linux/slab.h> > + > +#include <dt-bindings/clock/nuvoton,wpcm450-clk.h> > + > +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) { > + pr_err("%s: parent rate is zero", __func__); > + 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(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 = clk_hw_register(NULL, &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", { .name = "ref" }, REG_PLLCON0, 0 }, > + { "pll1", { .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[] = { > + { .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 *clk_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(clk_np, 0); > + if (!clk_base) { > + pr_err("%pOFP: failed to map registers\n", clk_np); > + of_node_put(clk_np); > + return; > + } > + of_node_put(clk_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(clk_base + data->reg, data->name, > + &data->parent, data->flags); > + if (IS_ERR(hw)) { > + pr_info("Failed to register PLL: %pe", 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(clk_np, of_clk_hw_onecell_get, clk_data); > + if (ret) > + pr_err("Failed to add DT provider: %d\n", 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 = clk_np; > + reset->membase = clk_base + REG_IPSRST; > + ret = reset_controller_register(&reset->rcdev); > + if (ret) > + pr_err("Failed to register reset controller: %d\n", ret); > + > + of_node_put(clk_np); > +} > + > +CLK_OF_DECLARE(wpcm450_clk_init, "nuvoton,wpcm450-clk", wpcm450_clk_init); > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig > index 2a52c990d4fec..16e111d213560 100644 > --- a/drivers/reset/Kconfig > +++ b/drivers/reset/Kconfig > @@ -208,7 +208,7 @@ config RESET_SCMI > > config RESET_SIMPLE > bool "Simple Reset Controller Driver" if COMPILE_TEST || EXPERT > - default ARCH_ASPEED || ARCH_BCMBCA || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || (ARCH_INTEL_SOCFPGA && ARM64) || ARCH_SUNXI || ARC > + default ARCH_ASPEED || ARCH_BCMBCA || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || (ARCH_INTEL_SOCFPGA && ARM64) || ARCH_SUNXI || ARC || ARCH_WPCM450 > depends on HAS_IOMEM > help > This enables a simple reset controller driver for reset lines that > -- > 2.39.2 >
Hi Jonathan, On Sun, Apr 23, 2023 at 12:02:40AM +0200, Jonathan Neuschäfer wrote: > 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 <j.neuschaefer@gmx.net> [...] > diff --git a/drivers/clk/clk-wpcm450.c b/drivers/clk/clk-wpcm450.c > new file mode 100644 > index 0000000000000..6f6d8a1ea3484 > --- /dev/null > +++ b/drivers/clk/clk-wpcm450.c > @@ -0,0 +1,374 @@ [...] > +static void __init wpcm450_clk_init(struct device_node *clk_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; [...] > + // 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 = clk_np; > + reset->membase = clk_base + REG_IPSRST; > + ret = reset_controller_register(&reset->rcdev); > + if (ret) > + pr_err("Failed to register reset controller: %d\n", ret); You could use %pe for consistency. regards Philipp
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index e3ca0d058a256..b58352d4d615d 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -75,6 +75,7 @@ obj-$(CONFIG_COMMON_CLK_RS9_PCIE) += clk-renesas-pcie.o obj-$(CONFIG_COMMON_CLK_VC5) += clk-versaclock5.o obj-$(CONFIG_COMMON_CLK_VC7) += clk-versaclock7.o obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o +obj-$(CONFIG_ARCH_WPCM450) += clk-wpcm450.o obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o # please keep this section sorted lexicographically by directory path name diff --git a/drivers/clk/clk-wpcm450.c b/drivers/clk/clk-wpcm450.c new file mode 100644 index 0000000000000..6f6d8a1ea3484 --- /dev/null +++ b/drivers/clk/clk-wpcm450.c @@ -0,0 +1,374 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton WPCM450 clock and reset controller driver. + * + * Copyright (C) 2022 Jonathan Neuschäfer <j.neuschaefer@gmx.net> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/bitfield.h> +#include <linux/clk-provider.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/reset-controller.h> +#include <linux/reset/reset-simple.h> +#include <linux/slab.h> + +#include <dt-bindings/clock/nuvoton,wpcm450-clk.h> + +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) { + pr_err("%s: parent rate is zero", __func__); + 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(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 = clk_hw_register(NULL, &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", { .name = "ref" }, REG_PLLCON0, 0 }, + { "pll1", { .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[] = { + { .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 *clk_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(clk_np, 0); + if (!clk_base) { + pr_err("%pOFP: failed to map registers\n", clk_np); + of_node_put(clk_np); + return; + } + of_node_put(clk_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(clk_base + data->reg, data->name, + &data->parent, data->flags); + if (IS_ERR(hw)) { + pr_info("Failed to register PLL: %pe", 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(clk_np, of_clk_hw_onecell_get, clk_data); + if (ret) + pr_err("Failed to add DT provider: %d\n", 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 = clk_np; + reset->membase = clk_base + REG_IPSRST; + ret = reset_controller_register(&reset->rcdev); + if (ret) + pr_err("Failed to register reset controller: %d\n", ret); + + of_node_put(clk_np); +} + +CLK_OF_DECLARE(wpcm450_clk_init, "nuvoton,wpcm450-clk", wpcm450_clk_init); diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 2a52c990d4fec..16e111d213560 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -208,7 +208,7 @@ config RESET_SCMI config RESET_SIMPLE bool "Simple Reset Controller Driver" if COMPILE_TEST || EXPERT - default ARCH_ASPEED || ARCH_BCMBCA || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || (ARCH_INTEL_SOCFPGA && ARM64) || ARCH_SUNXI || ARC + default ARCH_ASPEED || ARCH_BCMBCA || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || (ARCH_INTEL_SOCFPGA && ARM64) || ARCH_SUNXI || ARC || ARCH_WPCM450 depends on HAS_IOMEM help This enables a simple reset controller driver for reset lines that
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 <j.neuschaefer@gmx.net> --- v7: - 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: - https://lore.kernel.org/lkml/20220610072141.347795-6-j.neuschaefer@gmx.net/ - Fix reset controller initialization v3: - https://lore.kernel.org/lkml/20220508194333.2170161-7-j.neuschaefer@gmx.net/ - Change reference clock name from "refclk" to "ref" - Remove unused variable in return path of wpcm450_clk_register_pll - Remove unused divisor tables v2: - https://lore.kernel.org/lkml/20220429172030.398011-7-j.neuschaefer@gmx.net/ - no changes --- drivers/clk/Makefile | 1 + drivers/clk/clk-wpcm450.c | 374 ++++++++++++++++++++++++++++++++++++++ drivers/reset/Kconfig | 2 +- 3 files changed, 376 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/clk-wpcm450.c -- 2.39.2