mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Atmel Corporation
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* Wenyou.Yang <wenyou.yang@atmel.com>
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <syscon.h>
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#include <linux/io.h>
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#include <mach/at91_pmc.h>
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#include <mach/sama5_sfr.h>
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#include "pmc.h"
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/*
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* The purpose of this clock is to generate a 480 MHz signal. A different
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* rate can't be configured.
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*/
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#define UTMI_RATE 480000000
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static int utmi_clk_enable(struct clk *clk)
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{
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struct pmc_platdata *plat = dev_get_platdata(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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struct clk clk_dev;
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ulong clk_rate;
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u32 utmi_ref_clk_freq;
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u32 tmp;
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int err;
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if (readl(&pmc->sr) & AT91_PMC_LOCKU)
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return 0;
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/*
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* If mainck rate is different from 12 MHz, we have to configure the
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* FREQ field of the SFR_UTMICKTRIM register to generate properly
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* the utmi clock.
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*/
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err = clk_get_by_index(clk->dev, 0, &clk_dev);
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if (err)
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return -EINVAL;
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clk_rate = clk_get_rate(&clk_dev);
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switch (clk_rate) {
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case 12000000:
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utmi_ref_clk_freq = 0;
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break;
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case 16000000:
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utmi_ref_clk_freq = 1;
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break;
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case 24000000:
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utmi_ref_clk_freq = 2;
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break;
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/*
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* Not supported on SAMA5D2 but it's not an issue since MAINCK
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* maximum value is 24 MHz.
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*/
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case 48000000:
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utmi_ref_clk_freq = 3;
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break;
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default:
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printf("UTMICK: unsupported mainck rate\n");
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return -EINVAL;
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}
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if (plat->regmap_sfr) {
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err = regmap_read(plat->regmap_sfr, AT91_SFR_UTMICKTRIM, &tmp);
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if (err)
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return -EINVAL;
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tmp &= ~AT91_UTMICKTRIM_FREQ;
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tmp |= utmi_ref_clk_freq;
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err = regmap_write(plat->regmap_sfr, AT91_SFR_UTMICKTRIM, tmp);
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if (err)
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return -EINVAL;
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} else if (utmi_ref_clk_freq) {
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printf("UTMICK: sfr node required\n");
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return -EINVAL;
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}
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tmp = readl(&pmc->uckr);
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tmp |= AT91_PMC_UPLLEN |
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AT91_PMC_UPLLCOUNT |
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AT91_PMC_BIASEN;
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writel(tmp, &pmc->uckr);
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while (!(readl(&pmc->sr) & AT91_PMC_LOCKU))
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;
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return 0;
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}
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static ulong utmi_clk_get_rate(struct clk *clk)
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{
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/* UTMI clk rate is fixed. */
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return UTMI_RATE;
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}
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static struct clk_ops utmi_clk_ops = {
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.enable = utmi_clk_enable,
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.get_rate = utmi_clk_get_rate,
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};
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static int utmi_clk_ofdata_to_platdata(struct udevice *dev)
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{
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struct pmc_platdata *plat = dev_get_platdata(dev);
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struct udevice *syscon;
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uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
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"regmap-sfr", &syscon);
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if (syscon)
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plat->regmap_sfr = syscon_get_regmap(syscon);
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return 0;
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}
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static int utmi_clk_probe(struct udevice *dev)
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{
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return at91_pmc_core_probe(dev);
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}
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static const struct udevice_id utmi_clk_match[] = {
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{ .compatible = "atmel,at91sam9x5-clk-utmi" },
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{}
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};
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U_BOOT_DRIVER(at91sam9x5_utmi_clk) = {
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.name = "at91sam9x5-utmi-clk",
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.id = UCLASS_CLK,
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.of_match = utmi_clk_match,
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.probe = utmi_clk_probe,
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.ofdata_to_platdata = utmi_clk_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct pmc_platdata),
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.ops = &utmi_clk_ops,
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};
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