123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2019 DENX Software Engineering
- * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
- *
- * Copyright 2012 Freescale Semiconductor, Inc.
- * Copyright 2012 Linaro Ltd.
- *
- * The code contained herein is licensed under the GNU General Public
- * License. You may obtain a copy of the GNU General Public License
- * Version 2 or later at the following locations:
- *
- * http://www.opensource.org/licenses/gpl-license.html
- * http://www.gnu.org/copyleft/gpl.html
- */
- #include <common.h>
- #include <asm/io.h>
- #include <malloc.h>
- #include <clk-uclass.h>
- #include <dm/device.h>
- #include <dm/devres.h>
- #include <linux/clk-provider.h>
- #include <div64.h>
- #include <clk.h>
- #include "clk.h"
- #include <linux/err.h>
- #define UBOOT_DM_CLK_IMX_PFD "imx_clk_pfd"
- struct clk_pfd {
- struct clk clk;
- void __iomem *reg;
- u8 idx;
- };
- #define to_clk_pfd(_clk) container_of(_clk, struct clk_pfd, clk)
- #define SET 0x4
- #define CLR 0x8
- #define OTG 0xc
- static unsigned long clk_pfd_recalc_rate(struct clk *clk)
- {
- struct clk_pfd *pfd =
- to_clk_pfd(dev_get_clk_ptr(clk->dev));
- unsigned long parent_rate = clk_get_parent_rate(clk);
- u64 tmp = parent_rate;
- u8 frac = (readl(pfd->reg) >> (pfd->idx * 8)) & 0x3f;
- tmp *= 18;
- do_div(tmp, frac);
- return tmp;
- }
- static unsigned long clk_pfd_set_rate(struct clk *clk, unsigned long rate)
- {
- struct clk_pfd *pfd = to_clk_pfd(clk);
- unsigned long parent_rate = clk_get_parent_rate(clk);
- u64 tmp = parent_rate;
- u8 frac;
- tmp = tmp * 18 + rate / 2;
- do_div(tmp, rate);
- frac = tmp;
- if (frac < 12)
- frac = 12;
- else if (frac > 35)
- frac = 35;
- writel(0x3f << (pfd->idx * 8), pfd->reg + CLR);
- writel(frac << (pfd->idx * 8), pfd->reg + SET);
- return 0;
- }
- static const struct clk_ops clk_pfd_ops = {
- .get_rate = clk_pfd_recalc_rate,
- .set_rate = clk_pfd_set_rate,
- };
- struct clk *imx_clk_pfd(const char *name, const char *parent_name,
- void __iomem *reg, u8 idx)
- {
- struct clk_pfd *pfd;
- struct clk *clk;
- int ret;
- pfd = kzalloc(sizeof(*pfd), GFP_KERNEL);
- if (!pfd)
- return ERR_PTR(-ENOMEM);
- pfd->reg = reg;
- pfd->idx = idx;
- /* register the clock */
- clk = &pfd->clk;
- ret = clk_register(clk, UBOOT_DM_CLK_IMX_PFD, name, parent_name);
- if (ret) {
- kfree(pfd);
- return ERR_PTR(ret);
- }
- return clk;
- }
- U_BOOT_DRIVER(clk_pfd) = {
- .name = UBOOT_DM_CLK_IMX_PFD,
- .id = UCLASS_CLK,
- .ops = &clk_pfd_ops,
- .flags = DM_FLAG_PRE_RELOC,
- };
|