diff options
Diffstat (limited to 'drivers/clk/at91/clk-utmi.c')
-rw-r--r-- | drivers/clk/at91/clk-utmi.c | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c deleted file mode 100644 index 18af0bfeaa..0000000000 --- a/drivers/clk/at91/clk-utmi.c +++ /dev/null @@ -1,142 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright (C) 2016 Atmel Corporation - * Wenyou.Yang <wenyou.yang@atmel.com> - */ - -#include <common.h> -#include <clk-uclass.h> -#include <dm.h> -#include <syscon.h> -#include <linux/io.h> -#include <mach/at91_pmc.h> -#include <mach/at91_sfr.h> -#include "pmc.h" - -/* - * The purpose of this clock is to generate a 480 MHz signal. A different - * rate can't be configured. - */ -#define UTMI_RATE 480000000 - -static int utmi_clk_enable(struct clk *clk) -{ - struct pmc_platdata *plat = dev_get_platdata(clk->dev); - struct at91_pmc *pmc = plat->reg_base; - struct clk clk_dev; - ulong clk_rate; - u32 utmi_ref_clk_freq; - u32 tmp; - int err; - int timeout = 2000000; - - if (readl(&pmc->sr) & AT91_PMC_LOCKU) - return 0; - - /* - * If mainck rate is different from 12 MHz, we have to configure the - * FREQ field of the SFR_UTMICKTRIM register to generate properly - * the utmi clock. - */ - err = clk_get_by_index(clk->dev, 0, &clk_dev); - if (err) - return -EINVAL; - - clk_rate = clk_get_rate(&clk_dev); - switch (clk_rate) { - case 12000000: - utmi_ref_clk_freq = 0; - break; - case 16000000: - utmi_ref_clk_freq = 1; - break; - case 24000000: - utmi_ref_clk_freq = 2; - break; - /* - * Not supported on SAMA5D2 but it's not an issue since MAINCK - * maximum value is 24 MHz. - */ - case 48000000: - utmi_ref_clk_freq = 3; - break; - default: - printf("UTMICK: unsupported mainck rate\n"); - return -EINVAL; - } - - if (plat->regmap_sfr) { - err = regmap_read(plat->regmap_sfr, AT91_SFR_UTMICKTRIM, &tmp); - if (err) - return -EINVAL; - - tmp &= ~AT91_UTMICKTRIM_FREQ; - tmp |= utmi_ref_clk_freq; - err = regmap_write(plat->regmap_sfr, AT91_SFR_UTMICKTRIM, tmp); - if (err) - return -EINVAL; - } else if (utmi_ref_clk_freq) { - printf("UTMICK: sfr node required\n"); - return -EINVAL; - } - - tmp = readl(&pmc->uckr); - tmp |= AT91_PMC_UPLLEN | - AT91_PMC_UPLLCOUNT | - AT91_PMC_BIASEN; - writel(tmp, &pmc->uckr); - - while ((--timeout) && !(readl(&pmc->sr) & AT91_PMC_LOCKU)) - ; - if (!timeout) { - printf("UTMICK: timeout waiting for UPLL lock\n"); - return -ETIMEDOUT; - } - - return 0; -} - -static ulong utmi_clk_get_rate(struct clk *clk) -{ - /* UTMI clk rate is fixed. */ - return UTMI_RATE; -} - -static struct clk_ops utmi_clk_ops = { - .enable = utmi_clk_enable, - .get_rate = utmi_clk_get_rate, -}; - -static int utmi_clk_ofdata_to_platdata(struct udevice *dev) -{ - struct pmc_platdata *plat = dev_get_platdata(dev); - struct udevice *syscon; - - uclass_get_device_by_phandle(UCLASS_SYSCON, dev, - "regmap-sfr", &syscon); - - if (syscon) - plat->regmap_sfr = syscon_get_regmap(syscon); - - return 0; -} - -static int utmi_clk_probe(struct udevice *dev) -{ - return at91_pmc_core_probe(dev); -} - -static const struct udevice_id utmi_clk_match[] = { - { .compatible = "atmel,at91sam9x5-clk-utmi" }, - {} -}; - -U_BOOT_DRIVER(at91sam9x5_utmi_clk) = { - .name = "at91sam9x5-utmi-clk", - .id = UCLASS_CLK, - .of_match = utmi_clk_match, - .probe = utmi_clk_probe, - .ofdata_to_platdata = utmi_clk_ofdata_to_platdata, - .platdata_auto_alloc_size = sizeof(struct pmc_platdata), - .ops = &utmi_clk_ops, -}; |