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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>
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018 Microhip / Atmel Corporation
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* Wenyou.Yang <wenyou.yang@microchip.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/device.h>
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#include <linux/io.h>
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#include <mach/at91_pmc.h>
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#include "pmc.h"
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DECLARE_GLOBAL_DATA_PTR;
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#define AT91_USB_CLK_SOURCE_MAX 2
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#define AT91_USB_CLK_MAX_DIV 15
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struct at91_usb_clk_priv {
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u32 num_clksource;
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};
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static ulong at91_usb_clk_get_rate(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 source;
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u32 tmp, usbdiv;
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u8 source_index;
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int ret;
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tmp = readl(&pmc->pcr);
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source_index = (tmp >> AT91_PMC_USB_USBS_OFFSET) &
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AT91_PMC_USB_USBS_MASK;
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usbdiv = (tmp >> AT91_PMC_USB_DIV_OFFSET) & AT91_PMC_USB_DIV_MASK;
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ret = clk_get_by_index(clk->dev, source_index, &source);
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if (ret)
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return 0;
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return clk_get_rate(&source) / (usbdiv + 1);
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}
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static ulong at91_usb_clk_set_rate(struct clk *clk, ulong rate)
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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 at91_usb_clk_priv *priv = dev_get_priv(clk->dev);
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struct clk source, best_source;
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ulong tmp_rate, best_rate = rate, source_rate;
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int tmp_diff, best_diff = -1;
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u32 div, best_div = 0;
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u8 best_source_index = 0;
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u8 i;
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u32 tmp;
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int ret;
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for (i = 0; i < priv->num_clksource; i++) {
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ret = clk_get_by_index(clk->dev, i, &source);
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if (ret)
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return ret;
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source_rate = clk_get_rate(&source);
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if (IS_ERR_VALUE(source_rate))
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return source_rate;
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for (div = 1; div < AT91_USB_CLK_MAX_DIV + 2; div++) {
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tmp_rate = DIV_ROUND_CLOSEST(source_rate, div);
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tmp_diff = abs(rate - tmp_rate);
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if (best_diff < 0 || best_diff > tmp_diff) {
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best_rate = tmp_rate;
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best_diff = tmp_diff;
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best_div = div - 1;
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best_source = source;
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best_source_index = i;
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}
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if (!best_diff || tmp_rate < rate)
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break;
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}
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if (!best_diff)
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break;
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}
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debug("AT91 USB: best sourc: %s, best_rate = %ld, best_div = %d\n",
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best_source.dev->name, best_rate, best_div);
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ret = clk_enable(&best_source);
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if (ret)
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return ret;
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tmp = AT91_PMC_USB_USBS_(best_source_index) |
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AT91_PMC_USB_DIV_(best_div);
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writel(tmp, &pmc->usb);
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return 0;
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}
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static struct clk_ops at91_usb_clk_ops = {
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.get_rate = at91_usb_clk_get_rate,
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.set_rate = at91_usb_clk_set_rate,
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};
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static int at91_usb_clk_ofdata_to_platdata(struct udevice *dev)
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{
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struct at91_usb_clk_priv *priv = dev_get_priv(dev);
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u32 cells[AT91_USB_CLK_SOURCE_MAX];
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u32 num_clksource;
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num_clksource = fdtdec_get_int_array_count(gd->fdt_blob,
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dev_of_offset(dev),
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"clocks", cells,
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AT91_USB_CLK_SOURCE_MAX);
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if (!num_clksource)
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return -1;
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priv->num_clksource = num_clksource;
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return 0;
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}
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static int at91_usb_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 at91_usb_clk_match[] = {
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{ .compatible = "atmel,at91sam9x5-clk-usb" },
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{}
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};
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U_BOOT_DRIVER(at91_usb_clk) = {
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.name = "at91-usb-clk",
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.id = UCLASS_CLK,
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.of_match = at91_usb_clk_match,
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.probe = at91_usb_clk_probe,
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.ofdata_to_platdata = at91_usb_clk_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct at91_usb_clk_priv),
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.platdata_auto_alloc_size = sizeof(struct pmc_platdata),
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.ops = &at91_usb_clk_ops,
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};
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