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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/clk/berlin/berlin2-pll.c
2 * Copyright (c) 2014 Marvell Technology Group Ltd.
4 * Alexandre Belloni <alexandre.belloni@free-electrons.com>
5 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/clk-provider.h>
21 #include <linux/kernel.h>
23 #include <linux/of_address.h>
24 #include <linux/slab.h>
25 #include <asm/div64.h>
27 #include "berlin2-div.h"
28 #include "berlin2-pll.h"
33 struct berlin2_pll_map map
;
36 #define to_berlin2_pll(hw) container_of(hw, struct berlin2_pll, hw)
38 #define SPLL_CTRL0 0x00
39 #define SPLL_CTRL1 0x04
40 #define SPLL_CTRL2 0x08
41 #define SPLL_CTRL3 0x0c
42 #define SPLL_CTRL4 0x10
44 #define FBDIV_MASK 0x1ff
45 #define RFDIV_MASK 0x1f
46 #define DIVSEL_MASK 0xf
49 * The output frequency formula for the pll is:
50 * clkout = fbdiv / refdiv * parent / vcodiv
53 berlin2_pll_recalc_rate(struct clk_hw
*hw
, unsigned long parent_rate
)
55 struct berlin2_pll
*pll
= to_berlin2_pll(hw
);
56 struct berlin2_pll_map
*map
= &pll
->map
;
57 u32 val
, fbdiv
, rfdiv
, vcodivsel
, vcodiv
;
58 u64 rate
= parent_rate
;
60 val
= readl_relaxed(pll
->base
+ SPLL_CTRL0
);
61 fbdiv
= (val
>> map
->fbdiv_shift
) & FBDIV_MASK
;
62 rfdiv
= (val
>> map
->rfdiv_shift
) & RFDIV_MASK
;
64 pr_warn("%s has zero rfdiv\n", __clk_get_name(hw
->clk
));
68 val
= readl_relaxed(pll
->base
+ SPLL_CTRL1
);
69 vcodivsel
= (val
>> map
->divsel_shift
) & DIVSEL_MASK
;
70 vcodiv
= map
->vcodiv
[vcodivsel
];
72 pr_warn("%s has zero vcodiv (index %d)\n",
73 __clk_get_name(hw
->clk
), vcodivsel
);
77 rate
*= fbdiv
* map
->mult
;
78 do_div(rate
, rfdiv
* vcodiv
);
80 return (unsigned long)rate
;
83 static const struct clk_ops berlin2_pll_ops
= {
84 .recalc_rate
= berlin2_pll_recalc_rate
,
88 berlin2_pll_register(const struct berlin2_pll_map
*map
,
89 void __iomem
*base
, const char *name
,
90 const char *parent_name
, unsigned long flags
)
92 struct clk_init_data init
;
93 struct berlin2_pll
*pll
;
95 pll
= kzalloc(sizeof(*pll
), GFP_KERNEL
);
97 return ERR_PTR(-ENOMEM
);
99 /* copy pll_map to allow __initconst */
100 memcpy(&pll
->map
, map
, sizeof(*map
));
102 pll
->hw
.init
= &init
;
104 init
.ops
= &berlin2_pll_ops
;
105 init
.parent_names
= &parent_name
;
106 init
.num_parents
= 1;
109 return clk_register(NULL
, &pll
->hw
);