1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * OMAP2/3 interface clock control |
4 | * |
5 | * Copyright (C) 2011 Nokia Corporation |
6 | * Paul Walmsley |
7 | */ |
8 | #undef DEBUG |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/clk-provider.h> |
12 | #include <linux/io.h> |
13 | #include <linux/clk/ti.h> |
14 | |
15 | #include "clock.h" |
16 | |
17 | /* Register offsets */ |
18 | #define OMAP24XX_CM_FCLKEN2 0x04 |
19 | #define CM_AUTOIDLE 0x30 |
20 | #define CM_ICLKEN 0x10 |
21 | #define CM_IDLEST 0x20 |
22 | |
23 | #define OMAP24XX_CM_IDLEST_VAL 0 |
24 | |
25 | /* Private functions */ |
26 | |
27 | /* XXX */ |
28 | void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk) |
29 | { |
30 | u32 v; |
31 | struct clk_omap_reg r; |
32 | |
33 | memcpy(&r, &clk->enable_reg, sizeof(r)); |
34 | r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN); |
35 | |
36 | v = ti_clk_ll_ops->clk_readl(&r); |
37 | v |= (1 << clk->enable_bit); |
38 | ti_clk_ll_ops->clk_writel(v, &r); |
39 | } |
40 | |
41 | /* XXX */ |
42 | void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk) |
43 | { |
44 | u32 v; |
45 | struct clk_omap_reg r; |
46 | |
47 | memcpy(&r, &clk->enable_reg, sizeof(r)); |
48 | |
49 | r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN); |
50 | |
51 | v = ti_clk_ll_ops->clk_readl(&r); |
52 | v &= ~(1 << clk->enable_bit); |
53 | ti_clk_ll_ops->clk_writel(v, &r); |
54 | } |
55 | |
56 | /** |
57 | * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS |
58 | * @clk: struct clk * being enabled |
59 | * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into |
60 | * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into |
61 | * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator |
62 | * |
63 | * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the |
64 | * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function |
65 | * passes back the correct CM_IDLEST register address for I2CHS |
66 | * modules. No return value. |
67 | */ |
68 | static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk, |
69 | struct clk_omap_reg *idlest_reg, |
70 | u8 *idlest_bit, |
71 | u8 *idlest_val) |
72 | { |
73 | memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg)); |
74 | idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST); |
75 | *idlest_bit = clk->enable_bit; |
76 | *idlest_val = OMAP24XX_CM_IDLEST_VAL; |
77 | } |
78 | |
79 | /* Public data */ |
80 | |
81 | const struct clk_hw_omap_ops clkhwops_iclk = { |
82 | .allow_idle = omap2_clkt_iclk_allow_idle, |
83 | .deny_idle = omap2_clkt_iclk_deny_idle, |
84 | }; |
85 | |
86 | const struct clk_hw_omap_ops clkhwops_iclk_wait = { |
87 | .allow_idle = omap2_clkt_iclk_allow_idle, |
88 | .deny_idle = omap2_clkt_iclk_deny_idle, |
89 | .find_idlest = omap2_clk_dflt_find_idlest, |
90 | .find_companion = omap2_clk_dflt_find_companion, |
91 | }; |
92 | |
93 | /* 2430 I2CHS has non-standard IDLEST register */ |
94 | const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = { |
95 | .find_idlest = omap2430_clk_i2chs_find_idlest, |
96 | .find_companion = omap2_clk_dflt_find_companion, |
97 | }; |
98 | |