From mboxrd@z Thu Jan 1 00:00:00 1970 From: emilio@elopez.com.ar (=?UTF-8?q?Emilio=20L=C3=B3pez?=) Date: Wed, 27 Mar 2013 18:20:37 -0300 Subject: [PATCH v2 1/7] clk: sunxi: Add support for AXI, AHB, APB0 and APB1 gates In-Reply-To: <1364419243-18446-1-git-send-email-emilio@elopez.com.ar> References: <1363962042-29536-1-git-send-email-emilio@elopez.com.ar> <1364419243-18446-1-git-send-email-emilio@elopez.com.ar> Message-ID: <1364419243-18446-2-git-send-email-emilio@elopez.com.ar> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patchset adds DT support for all the AXI, AHB, APB0 and APB1 gates present on sunxi SoCs. Signed-off-by: Emilio L?pez --- Changes from v1: - renamed compatibles to sun4i - renamed TWI -> I2C - added note about gate availability on sun5i Documentation/devicetree/bindings/clock/sunxi.txt | 109 +++++++++++++++++++++- drivers/clk/sunxi/clk-sunxi.c | 88 +++++++++++++++++ 2 files changed, 196 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt index 20b8479..729f524 100644 --- a/Documentation/devicetree/bindings/clock/sunxi.txt +++ b/Documentation/devicetree/bindings/clock/sunxi.txt @@ -10,15 +10,23 @@ Required properties: "allwinner,sun4i-pll1-clk" - for the main PLL clock "allwinner,sun4i-cpu-clk" - for the CPU multiplexer clock "allwinner,sun4i-axi-clk" - for the AXI clock + "allwinner,sun4i-axi-gates-clk" - for the AXI gates "allwinner,sun4i-ahb-clk" - for the AHB clock + "allwinner,sun4i-ahb-gates-clk" - for the AHB gates "allwinner,sun4i-apb0-clk" - for the APB0 clock + "allwinner,sun4i-apb0-gates-clk" - for the APB0 gates "allwinner,sun4i-apb1-clk" - for the APB1 clock "allwinner,sun4i-apb1-mux-clk" - for the APB1 clock muxing + "allwinner,sun4i-apb1-gates-clk" - for the APB1 gates Required properties for all clocks: - reg : shall be the control register address for the clock. - clocks : shall be the input parent clock(s) phandle for the clock -- #clock-cells : from common clock binding; shall be set to 0. +- #clock-cells : from common clock binding; shall be set to 0 except for + "allwinner,sun4i-*-gates-clk" where it shall be set to 1 + +Additionally, "allwinner,sun4i-*-gates-clk" clocks require: +- clock-output-names : the corresponding gate names that the clock controls For example: @@ -42,3 +50,102 @@ cpu: cpu at 01c20054 { reg = <0x01c20054 0x4>; clocks = <&osc32k>, <&osc24M>, <&pll1>; }; + + + +Gate clock outputs + +The "allwinner,sun4i-*-gates-clk" clocks provide several gatable outputs; +their corresponding offsets as present on sun4i are listed below. Note that +some of these gates are not present on sun5i. + + * AXI gates ("allwinner,sun4i-axi-gates-clk") + + DRAM 0 + + * AHB gates ("allwinner,sun4i-ahb-gates-clk") + + USB0 0 + EHCI0 1 + OHCI0 2* + EHCI1 3 + OHCI1 4* + SS 5 + DMA 6 + BIST 7 + MMC0 8 + MMC1 9 + MMC2 10 + MMC3 11 + MS 12** + NAND 13 + SDRAM 14 + + ACE 16 + EMAC 17 + TS 18 + + SPI0 20 + SPI1 21 + SPI2 22 + SPI3 23 + PATA 24 + SATA 25** + GPS 26* + + VE 32 + TVD 33 + TVE0 34 + TVE1 35 + LCD0 36 + LCD1 37 + + CSI0 40 + CSI1 41 + + HDMI 43 + DE_BE0 44 + DE_BE1 45 + DE_FE0 46 + DE_FE1 47 + + MP 50 + + MALI400 52 + + * APB0 gates ("allwinner,sun4i-apb0-gates-clk") + + CODEC 0 + SPDIF 1* + AC97 2 + IIS 3 + + PIO 5 + IR0 6 + IR1 7 + + KEYPAD 10 + + * APB1 gates ("allwinner,sun4i-apb1-gates-clk") + + I2C0 0 + I2C1 1 + I2C2 2 + + CAN 4 + SCR 5 + PS20 6 + PS21 7 + + UART0 16 + UART1 17 + UART2 18 + UART3 19 + UART4 20 + UART5 21 + UART6 22 + UART7 23 + +Notation: + [*]: The datasheet didn't mention these, but they are present on AW code + [**]: The datasheet had this marked as "NC" but they are used on AW code diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c index d528a24..244de90 100644 --- a/drivers/clk/sunxi/clk-sunxi.c +++ b/drivers/clk/sunxi/clk-sunxi.c @@ -302,6 +302,82 @@ static void __init sunxi_divider_clk_setup(struct device_node *node, } + +/** + * sunxi_gates_clk_setup() - Setup function for leaf gates on clocks + */ + +#define SUNXI_GATES_MAX_SIZE 64 + +struct gates_data { + DECLARE_BITMAP(mask, SUNXI_GATES_MAX_SIZE); +}; + +static const __initconst struct gates_data axi_gates_data = { + .mask = {1}, +}; + +static const __initconst struct gates_data ahb_gates_data = { + .mask = {0x7F77FFF, 0x14FB3F}, +}; + +static const __initconst struct gates_data apb0_gates_data = { + .mask = {0x4EF}, +}; + +static const __initconst struct gates_data apb1_gates_data = { + .mask = {0xFF00F7}, +}; + +static void __init sunxi_gates_clk_setup(struct device_node *node, + struct gates_data *data) +{ + struct clk_onecell_data *clk_data; + const char *clk_parent; + const char *clk_name; + void *reg; + int qty; + int i = 0; + int j = 0; + int ignore; + + reg = of_iomap(node, 0); + + clk_parent = of_clk_get_parent_name(node, 0); + + /* Worst-case size approximation and memory allocation */ + qty = find_last_bit(data->mask, SUNXI_GATES_MAX_SIZE); + clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL); + if (!clk_data) + return; + clk_data->clks = kzalloc((qty+1) * sizeof(struct clk *), GFP_KERNEL); + if (!clk_data->clks) { + kfree(clk_data); + return; + } + + for_each_set_bit(i, data->mask, SUNXI_GATES_MAX_SIZE) { + of_property_read_string_index(node, "clock-output-names", + j, &clk_name); + + /* No driver claims this clock, but it should remain gated */ + ignore = !strcmp("ahb_sdram", clk_name) ? CLK_IGNORE_UNUSED : 0; + + clk_data->clks[i] = clk_register_gate(NULL, clk_name, + clk_parent, ignore, + reg + 4 * (i/32), i % 32, + 0, &clk_lock); + WARN_ON(IS_ERR(clk_data->clks[i])); + + j++; + } + + /* Adjust to the real max */ + clk_data->clk_num = i; + + of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); +} + /* Matches for of_clk_init */ static const __initconst struct of_device_id clk_match[] = { {.compatible = "fixed-clock", .data = of_fixed_clk_setup,}, @@ -331,6 +407,15 @@ static const __initconst struct of_device_id clk_mux_match[] = { {} }; +/* Matches for gate clocks */ +static const __initconst struct of_device_id clk_gates_match[] = { + {.compatible = "allwinner,sun4i-axi-gates-clk", .data = &axi_gates_data,}, + {.compatible = "allwinner,sun4i-ahb-gates-clk", .data = &ahb_gates_data,}, + {.compatible = "allwinner,sun4i-apb0-gates-clk", .data = &apb0_gates_data,}, + {.compatible = "allwinner,sun4i-apb1-gates-clk", .data = &apb1_gates_data,}, + {} +}; + static void __init of_sunxi_table_clock_setup(const struct of_device_id *clk_match, void *function) { @@ -359,4 +444,7 @@ void __init sunxi_init_clocks(void) /* Register mux clocks */ of_sunxi_table_clock_setup(clk_mux_match, sunxi_mux_clk_setup); + + /* Register gate clocks */ + of_sunxi_table_clock_setup(clk_gates_match, sunxi_gates_clk_setup); } -- 1.8.2