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Wed, 20 Sep 2017 21:27:07 -0700 (PDT) Received: by aurora.jms.id.au (sSMTP sendmail emulation); Thu, 21 Sep 2017 13:56:59 +0930 From: Joel Stanley To: Lee Jones , Michael Turquette , Stephen Boyd Subject: [PATCH v2 1/5] clk: Add clock driver for ASPEED BMC SoCs Date: Thu, 21 Sep 2017 13:56:37 +0930 Message-Id: <20170921042641.7326-2-joel@jms.id.au> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170921042641.7326-1-joel@jms.id.au> References: <20170921042641.7326-1-joel@jms.id.au> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170920_212730_606216_3E66B168 X-CRM114-Status: GOOD ( 24.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ryan Chen , Arnd Bergmann , Andrew Jeffery , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, Rick Altherr , Jeremy Kerr , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This adds the stub of a driver for the ASPEED SoCs. The clocks are defined and the static registration is set up. Signed-off-by: Joel Stanley --- drivers/clk/Kconfig | 12 +++ drivers/clk/Makefile | 1 + drivers/clk/clk-aspeed.c | 162 +++++++++++++++++++++++++++++++ include/dt-bindings/clock/aspeed-clock.h | 43 ++++++++ 4 files changed, 218 insertions(+) create mode 100644 drivers/clk/clk-aspeed.c create mode 100644 include/dt-bindings/clock/aspeed-clock.h diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 1c4e1aa6767e..9abe063ef8d2 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -142,6 +142,18 @@ config COMMON_CLK_GEMINI This driver supports the SoC clocks on the Cortina Systems Gemini platform, also known as SL3516 or CS3516. +config COMMON_CLK_ASPEED + bool "Clock driver for Aspeed BMC SoCs" + depends on ARCH_ASPEED || COMPILE_TEST + default ARCH_ASPEED + select MFD_SYSCON + select RESET_CONTROLLER + ---help--- + This driver supports the SoC clocks on the Aspeed BMC platforms. + + The G4 and G5 series, including the ast2400 and ast2500, are supported + by this driver. + config COMMON_CLK_S2MPS11 tristate "Clock driver for S2MPS1X/S5M8767 MFD" depends on MFD_SEC_CORE || COMPILE_TEST diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index c99f363826f0..575c68919d9b 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_ARCH_CLPS711X) += clk-clps711x.o obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o obj-$(CONFIG_COMMON_CLK_GEMINI) += clk-gemini.o +obj-$(CONFIG_COMMON_CLK_ASPEED) += clk-aspeed.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_CLK_HSDK) += clk-hsdk-pll.o obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c new file mode 100644 index 000000000000..824c54767009 --- /dev/null +++ b/drivers/clk/clk-aspeed.c @@ -0,0 +1,162 @@ +/* + * Copyright 2017 IBM Corporation + * + * Joel Stanley + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#define pr_fmt(fmt) "clk-aspeed: " fmt + +#include +#include +#include +#include +#include +#include + +#include + +#define ASPEED_RESET_CTRL 0x04 +#define ASPEED_CLK_SELECTION 0x08 +#define ASPEED_CLK_STOP_CTRL 0x0c +#define ASPEED_MPLL_PARAM 0x20 +#define ASPEED_HPLL_PARAM 0x24 +#define ASPEED_MISC_CTRL 0x2c +#define ASPEED_STRAP 0x70 + +/* Keeps track of all clocks */ +static struct clk_hw_onecell_data *aspeed_clk_data; + +static void __iomem *scu_base; + +/** + * struct aspeed_gate_data - Aspeed gated clocks + * @clock_idx: bit used to gate this clock in the clock register + * @reset_idx: bit used to reset this IP in the reset register. -1 if no + * reset is required when enabling the clock + * @name: the clock name + * @parent_name: the name of the parent clock + * @flags: standard clock framework flags + */ +struct aspeed_gate_data { + u8 clock_idx; + s8 reset_idx; + const char *name; + const char *parent_name; + unsigned long flags; +}; + +/** + * struct aspeed_clk_gate - Aspeed specific clk_gate structure + * @hw: handle between common and hardware-specific interfaces + * @reg: register controlling gate + * @clock_idx: bit used to gate this clock in the clock register + * @reset_idx: bit used to reset this IP in the reset register. -1 if no + * reset is required when enabling the clock + * @flags: hardware-specific flags + * @lock: register lock + * + * Some of the clocks in the Aspeed SoC must be put in reset before enabling. + * This modified version of clk_gate allows an optional reset bit to be + * specified. + */ +struct aspeed_clk_gate { + struct clk_hw hw; + struct regmap *map; + u8 clock_idx; + s8 reset_idx; + u8 flags; + spinlock_t *lock; +}; + +#define to_aspeed_clk_gate(_hw) container_of(_hw, struct aspeed_clk_gate, hw) + +/* TODO: ask Aspeed about the actual parent data */ +static const struct aspeed_gate_data aspeed_gates[] __initconst = { +/* clk rst name parent flags */ + { 0, -1, "eclk-gate", "eclk", 0 }, /* Video Engine */ + { 1, 7, "gclk-gate", NULL, 0 }, /* 2D engine */ + { 2, -1, "mclk-gate", "mpll", CLK_IS_CRITICAL }, /* SDRAM */ + { 3, 6, "vclk-gate", NULL, 0 }, /* Video Capture */ + { 4, 10, "bclk-gate", "bclk", 0 }, /* PCIe/PCI */ + { 5, -1, "dclk-gate", NULL, 0 }, /* DAC */ + { 6, -1, "refclk-gate", "clkin", CLK_IS_CRITICAL }, + { 7, 3, "usb-port2-gate", NULL, 0 }, /* USB2.0 Host port 2 */ + { 8, 5, "lclk-gate", NULL, 0 }, /* LPC */ + { 9, 15, "usb-uhci-gate", NULL, 0 }, /* USB1.1 (requires port 2 enabled) */ + { 10, 13, "d1clk-gate", NULL, 0 }, /* GFX CRT */ + /* 11: reserved */ + /* 12: reserved */ + { 13, 4, "yclk-gate", NULL, 0 }, /* HAC */ + { 14, 14, "usb-port1-gate", NULL, 0 }, /* USB2 hub/USB2 host port 1/USB1.1 dev */ + { 15, -1, "uart1clk-gate", "uart", 0 }, /* UART1 */ + { 16, -1, "uart2clk-gate", "uart", 0 }, /* UART2 */ + { 17, -1, "uart5clk-gate", "uart", 0 }, /* UART5 */ + /* 18: reserved */ + { 19, -1, "espiclk-gate", NULL, 0 }, /* eSPI */ + { 20, 11, "mac1clk-gate", "clkin", 0 }, /* MAC1 */ + { 21, 12, "mac2clk-gate", "clkin", 0 }, /* MAC2 */ + /* 22: reserved */ + /* 23: reserved */ + { 24, -1, "rsaclk-gate", NULL, 0 }, /* RSA */ + { 25, -1, "uart3clk-gate", "uart", 0 }, /* UART3 */ + { 26, -1, "uart4clk-gate", "uart", 0 }, /* UART4 */ + { 27, 16, "sdclk-gate", NULL, 0 }, /* SDIO/SD */ + { 28, -1, "lhclk-gate", "lhclk", 0 }, /* LPC master/LPC+ */ + /* 29: reserved */ + /* 30: reserved */ + /* 31: reserved */ +}; + +static void __init aspeed_cc_init(struct device_node *np) +{ + struct regmap *map; + u32 val; + int ret; + int i; + + scu_base = of_iomap(np, 0); + if (IS_ERR(scu_base)) + return; + + aspeed_clk_data = kzalloc(sizeof(*aspeed_clk_data) + + sizeof(*aspeed_clk_data->hws) * ASPEED_NUM_CLKS, + GFP_KERNEL); + if (!aspeed_clk_data) + return; + + /* + * This way all clock fetched before the platform device probes, + * except those we assign here for early use, will be deferred. + */ + for (i = 0; i < ASPEED_NUM_CLKS; i++) + aspeed_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER); + + map = syscon_node_to_regmap(np); + if (IS_ERR(map)) { + pr_err("no syscon regmap\n"); + return; + } + /* + * We check that the regmap works on this very first access, + * but as this is an MMIO-backed regmap, subsequent regmap + * access is not going to fail and we skip error checks from + * this point. + */ + ret = regmap_read(map, ASPEED_STRAP, &val); + if (ret) { + pr_err("failed to read strapping register\n"); + return; + } + + aspeed_clk_data->num = ASPEED_NUM_CLKS; + ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, aspeed_clk_data); + if (ret) + pr_err("failed to add DT provider: %d\n", ret); +}; +CLK_OF_DECLARE_DRIVER(aspeed_cc_g5, "aspeed,ast2500-scu", aspeed_cc_init); +CLK_OF_DECLARE_DRIVER(aspeed_cc_g4, "aspeed,ast2400-scu", aspeed_cc_init); diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h new file mode 100644 index 000000000000..afe06b77562d --- /dev/null +++ b/include/dt-bindings/clock/aspeed-clock.h @@ -0,0 +1,43 @@ +#ifndef DT_BINDINGS_ASPEED_CLOCK_H +#define DT_BINDINGS_ASPEED_CLOCK_H + +#define ASPEED_NUM_CLKS 34 + +#define ASPEED_CLK_HPLL 0 +#define ASPEED_CLK_AHB 1 +#define ASPEED_CLK_APB 2 +#define ASPEED_CLK_UART 3 +#define ASPEED_CLK_SDIO 4 +#define ASPEED_CLK_ECLK 5 +#define ASPEED_CLK_ECLK_MUX 6 +#define ASPEED_CLK_LHCLK 7 +#define ASPEED_CLK_MAC 8 +#define ASPEED_CLK_BCLK 9 +#define ASPEED_CLK_MPLL 10 +#define ASPEED_CLK_GATES 11 +#define ASPEED_CLK_GATE_ECLK (0 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_GCLK (1 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_MCLK (2 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_VCLK (3 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_BCLK (4 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_DCLK (5 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_REFCLK (6 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_USBPORT2CLK (7 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_LCLK (8 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_USBUHCICLK (9 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_D1CLK (10 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_YCLK (11 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_USBPORT1CLK (12 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_UART1CLK (13 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_UART2CLK (14 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_UART5CLK (15 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_ESPICLK (16 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_MAC1CLK (17 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_MAC2CLK (18 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_RSACLK (19 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_UART3CLK (20 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_UART4CLK (21 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_SDCLKCLK (22 + ASPEED_CLK_GATES) +#define ASPEED_CLK_GATE_LHCCLK (23 + ASPEED_CLK_GATES) + +#endif