diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.12/105-clk-sunxi_mod0.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.12/105-clk-sunxi_mod0.patch | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.12/105-clk-sunxi_mod0.patch b/target/linux/sunxi/patches-3.12/105-clk-sunxi_mod0.patch new file mode 100644 index 0000000000..bbb8057f7c --- /dev/null +++ b/target/linux/sunxi/patches-3.12/105-clk-sunxi_mod0.patch @@ -0,0 +1,121 @@ +From 3473e6acea4bd01ba2b334628970390207f9f4fd Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Emilio=20L=C3=B3pez?= <emilio@elopez.com.ar> +Date: Tue, 21 May 2013 21:25:05 -0300 +Subject: [PATCH] clk: sunxi: mod0 support +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This commit implements support for the "module 0" type of clocks, as +used by MMC, IR, NAND, SATA and other components. + +Signed-off-by: Emilio López <emilio@elopez.com.ar> +--- + Documentation/devicetree/bindings/clock/sunxi.txt | 1 + + drivers/clk/sunxi/clk-sunxi.c | 57 +++++++++++++++++++++++ + 2 files changed, 58 insertions(+) + +diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt +index 773f3ae..ff3f61c 100644 +--- a/Documentation/devicetree/bindings/clock/sunxi.txt ++++ b/Documentation/devicetree/bindings/clock/sunxi.txt +@@ -35,6 +35,7 @@ Required properties: + "allwinner,sun7i-a20-apb1-gates-clk" - for the APB1 gates on A20 + "allwinner,sun6i-a31-apb2-div-clk" - for the APB2 gates on A31 + "allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31 ++ "allwinner,sun4i-mod0-clk" - for the module 0 family of clocks + + Required properties for all clocks: + - reg : shall be the control register address for the clock. +diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c +index 6947ba9..96c01b2 100644 +--- a/drivers/clk/sunxi/clk-sunxi.c ++++ b/drivers/clk/sunxi/clk-sunxi.c +@@ -287,6 +287,47 @@ static void sun4i_get_apb1_factors(u32 *freq, u32 parent_rate, + + + /** ++ * sun4i_get_mod0_factors() - calculates m, n factors for MOD0-style clocks ++ * MMC rate is calculated as follows ++ * rate = (parent_rate >> p) / (m + 1); ++ */ ++ ++static void sun4i_get_mod0_factors(u32 *freq, u32 parent_rate, ++ u8 *n, u8 *k, u8 *m, u8 *p) ++{ ++ u8 div, calcm, calcp; ++ ++ /* These clocks can only divide, so we will never be able to achieve ++ * frequencies higher than the parent frequency */ ++ if (*freq > parent_rate) ++ *freq = parent_rate; ++ ++ div = parent_rate / *freq; ++ ++ if (div < 16) ++ calcp = 0; ++ else if (div / 2 < 16) ++ calcp = 1; ++ else if (div / 4 < 16) ++ calcp = 2; ++ else ++ calcp = 3; ++ ++ calcm = DIV_ROUND_UP(div, 1 << calcp); ++ ++ *freq = (parent_rate >> calcp) / calcm; ++ ++ /* we were called to round the frequency, we can now return */ ++ if (n == NULL) ++ return; ++ ++ *m = calcm - 1; ++ *p = calcp; ++} ++ ++ ++ ++/** + * sunxi_factors_clk_setup() - Setup function for factor clocks + */ + +@@ -333,6 +374,14 @@ struct factors_data { + .pwidth = 2, + }; + ++/* user manual says "n" but it's really "p" */ ++static struct clk_factors_config sun4i_mod0_config = { ++ .mshift = 0, ++ .mwidth = 4, ++ .pshift = 16, ++ .pwidth = 2, ++}; ++ + static const struct factors_data sun4i_pll1_data __initconst = { + .enable = 31, + .table = &sun4i_pll1_config, +@@ -356,6 +405,13 @@ struct factors_data { + .getter = sun4i_get_apb1_factors, + }; + ++static const struct factors_data sun4i_mod0_data __initconst = { ++ .enable = 31, ++ .mux = 24, ++ .table = &sun4i_mod0_config, ++ .getter = sun4i_get_mod0_factors, ++}; ++ + static struct clk * __init sunxi_factors_clk_setup(struct device_node *node, + const struct factors_data *data) + { +@@ -779,6 +835,7 @@ static void __init sunxi_divs_clk_setup(struct device_node *node, + {.compatible = "allwinner,sun4i-pll1-clk", .data = &sun4i_pll1_data,}, + {.compatible = "allwinner,sun6i-a31-pll1-clk", .data = &sun6i_a31_pll1_data,}, + {.compatible = "allwinner,sun4i-apb1-clk", .data = &sun4i_apb1_data,}, ++ {.compatible = "allwinner,sun4i-mod0-clk", .data = &sun4i_mod0_data,}, + {} + }; + +-- +1.8.4 + |