mirror of
https://github.com/AsahiLinux/u-boot
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1025 lines
22 KiB
C
1025 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Compatible code for non CCF AT91 platforms.
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*
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* Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
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*
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* Author: Claudiu Beznea <claudiu.beznea@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.h>
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#include <asm/global_data.h>
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#include <dm/device_compat.h>
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#include <dm/lists.h>
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#include <dm/util.h>
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#include <mach/at91_pmc.h>
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#include <mach/at91_sfr.h>
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#include <regmap.h>
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#include <syscon.h>
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#include "pmc.h"
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DECLARE_GLOBAL_DATA_PTR;
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struct pmc_plat {
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struct at91_pmc *reg_base;
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struct regmap *regmap_sfr;
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};
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static const struct udevice_id at91_pmc_match[] = {
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{ .compatible = "atmel,at91rm9200-pmc" },
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{ .compatible = "atmel,at91sam9260-pmc" },
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{ .compatible = "atmel,at91sam9g45-pmc" },
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{ .compatible = "atmel,at91sam9n12-pmc" },
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{ .compatible = "atmel,at91sam9x5-pmc" },
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{ .compatible = "atmel,sama5d3-pmc" },
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{ .compatible = "atmel,sama5d2-pmc" },
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{}
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};
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U_BOOT_DRIVER(at91_pmc) = {
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.name = "at91-pmc",
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.id = UCLASS_SIMPLE_BUS,
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.of_match = at91_pmc_match,
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};
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static int at91_pmc_core_probe(struct udevice *dev)
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{
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struct pmc_plat *plat = dev_get_plat(dev);
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dev = dev_get_parent(dev);
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plat->reg_base = dev_read_addr_ptr(dev);
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return 0;
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}
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/**
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* at91_clk_sub_device_bind() - for the at91 clock driver
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* Recursively bind its children as clk devices.
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*
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* @return: 0 on success, or negative error code on failure
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*/
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int at91_clk_sub_device_bind(struct udevice *dev, const char *drv_name)
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{
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const void *fdt = gd->fdt_blob;
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int offset = dev_of_offset(dev);
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bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
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const char *name;
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int ret;
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for (offset = fdt_first_subnode(fdt, offset);
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offset > 0;
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offset = fdt_next_subnode(fdt, offset)) {
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if (pre_reloc_only &&
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!ofnode_pre_reloc(offset_to_ofnode(offset)))
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continue;
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/*
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* If this node has "compatible" property, this is not
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* a clock sub-node, but a normal device. skip.
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*/
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fdt_get_property(fdt, offset, "compatible", &ret);
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if (ret >= 0)
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continue;
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if (ret != -FDT_ERR_NOTFOUND)
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return ret;
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name = fdt_get_name(fdt, offset, NULL);
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if (!name)
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return -EINVAL;
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ret = device_bind_driver_to_node(dev, drv_name, name,
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offset_to_ofnode(offset), NULL);
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if (ret)
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return ret;
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}
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return 0;
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}
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int at91_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
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{
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int periph;
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if (args->args_count) {
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debug("Invalid args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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periph = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(clk->dev), "reg",
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-1);
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if (periph < 0)
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return -EINVAL;
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clk->id = periph;
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return 0;
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}
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int at91_clk_probe(struct udevice *dev)
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{
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struct udevice *dev_periph_container, *dev_pmc;
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struct pmc_plat *plat = dev_get_plat(dev);
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dev_periph_container = dev_get_parent(dev);
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dev_pmc = dev_get_parent(dev_periph_container);
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plat->reg_base = dev_read_addr_ptr(dev_pmc);
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return 0;
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}
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/* SCKC specific code. */
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static const struct udevice_id at91_sckc_match[] = {
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{ .compatible = "atmel,at91sam9x5-sckc" },
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{}
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};
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U_BOOT_DRIVER(at91_sckc) = {
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.name = "at91-sckc",
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.id = UCLASS_SIMPLE_BUS,
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.of_match = at91_sckc_match,
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};
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/* Slow clock specific code. */
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static int at91_slow_clk_enable(struct clk *clk)
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{
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return 0;
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}
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static ulong at91_slow_clk_get_rate(struct clk *clk)
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{
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return CONFIG_SYS_AT91_SLOW_CLOCK;
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}
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static struct clk_ops at91_slow_clk_ops = {
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.enable = at91_slow_clk_enable,
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.get_rate = at91_slow_clk_get_rate,
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};
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static const struct udevice_id at91_slow_clk_match[] = {
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{ .compatible = "atmel,at91sam9x5-clk-slow" },
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{}
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};
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U_BOOT_DRIVER(at91_slow_clk) = {
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.name = "at91-slow-clk",
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.id = UCLASS_CLK,
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.of_match = at91_slow_clk_match,
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.ops = &at91_slow_clk_ops,
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};
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/* Master clock specific code. */
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static ulong at91_master_clk_get_rate(struct clk *clk)
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{
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return gd->arch.mck_rate_hz;
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}
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static struct clk_ops at91_master_clk_ops = {
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.get_rate = at91_master_clk_get_rate,
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};
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static const struct udevice_id at91_master_clk_match[] = {
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{ .compatible = "atmel,at91rm9200-clk-master" },
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{ .compatible = "atmel,at91sam9x5-clk-master" },
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{}
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};
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U_BOOT_DRIVER(at91_master_clk) = {
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.name = "at91-master-clk",
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.id = UCLASS_CLK,
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.of_match = at91_master_clk_match,
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.ops = &at91_master_clk_ops,
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};
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/* Main osc clock specific code. */
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static int main_osc_clk_enable(struct clk *clk)
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{
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struct pmc_plat *plat = dev_get_plat(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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if (readl(&pmc->sr) & AT91_PMC_MOSCSELS)
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return 0;
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return -EINVAL;
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}
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static ulong main_osc_clk_get_rate(struct clk *clk)
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{
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return gd->arch.main_clk_rate_hz;
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}
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static struct clk_ops main_osc_clk_ops = {
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.enable = main_osc_clk_enable,
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.get_rate = main_osc_clk_get_rate,
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};
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static int main_osc_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 main_osc_clk_match[] = {
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{ .compatible = "atmel,at91sam9x5-clk-main" },
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{}
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};
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U_BOOT_DRIVER(at91sam9x5_main_osc_clk) = {
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.name = "at91sam9x5-main-osc-clk",
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.id = UCLASS_CLK,
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.of_match = main_osc_clk_match,
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.probe = main_osc_clk_probe,
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.plat_auto = sizeof(struct pmc_plat),
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.ops = &main_osc_clk_ops,
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};
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/* PLLA clock specific code. */
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static int plla_clk_enable(struct clk *clk)
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{
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struct pmc_plat *plat = dev_get_plat(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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if (readl(&pmc->sr) & AT91_PMC_LOCKA)
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return 0;
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return -EINVAL;
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}
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static ulong plla_clk_get_rate(struct clk *clk)
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{
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return gd->arch.plla_rate_hz;
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}
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static struct clk_ops plla_clk_ops = {
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.enable = plla_clk_enable,
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.get_rate = plla_clk_get_rate,
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};
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static int plla_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 plla_clk_match[] = {
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{ .compatible = "atmel,sama5d3-clk-pll" },
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{}
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};
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U_BOOT_DRIVER(at91_plla_clk) = {
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.name = "at91-plla-clk",
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.id = UCLASS_CLK,
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.of_match = plla_clk_match,
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.probe = plla_clk_probe,
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.plat_auto = sizeof(struct pmc_plat),
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.ops = &plla_clk_ops,
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};
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/* PLLA DIV clock specific code. */
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static int at91_plladiv_clk_enable(struct clk *clk)
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{
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return 0;
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}
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static ulong at91_plladiv_clk_get_rate(struct clk *clk)
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{
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struct pmc_plat *plat = dev_get_plat(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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struct clk source;
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ulong clk_rate;
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int ret;
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ret = clk_get_by_index(clk->dev, 0, &source);
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if (ret)
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return -EINVAL;
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clk_rate = clk_get_rate(&source);
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if (readl(&pmc->mckr) & AT91_PMC_MCKR_PLLADIV_2)
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clk_rate /= 2;
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return clk_rate;
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}
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static ulong at91_plladiv_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct pmc_plat *plat = dev_get_plat(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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struct clk source;
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ulong parent_rate;
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int ret;
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ret = clk_get_by_index(clk->dev, 0, &source);
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if (ret)
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return -EINVAL;
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parent_rate = clk_get_rate(&source);
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if ((parent_rate != rate) && ((parent_rate) / 2 != rate))
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return -EINVAL;
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if (parent_rate != rate) {
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writel((readl(&pmc->mckr) | AT91_PMC_MCKR_PLLADIV_2),
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&pmc->mckr);
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}
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return 0;
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}
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static struct clk_ops at91_plladiv_clk_ops = {
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.enable = at91_plladiv_clk_enable,
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.get_rate = at91_plladiv_clk_get_rate,
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.set_rate = at91_plladiv_clk_set_rate,
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};
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static int at91_plladiv_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_plladiv_clk_match[] = {
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{ .compatible = "atmel,at91sam9x5-clk-plldiv" },
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{}
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};
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U_BOOT_DRIVER(at91_plladiv_clk) = {
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.name = "at91-plladiv-clk",
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.id = UCLASS_CLK,
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.of_match = at91_plladiv_clk_match,
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.probe = at91_plladiv_clk_probe,
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.plat_auto = sizeof(struct pmc_plat),
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.ops = &at91_plladiv_clk_ops,
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};
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/* System clock specific code. */
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#define SYSTEM_MAX_ID 31
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/**
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* at91_system_clk_bind() - for the system clock driver
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* Recursively bind its children as clk devices.
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*
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* @return: 0 on success, or negative error code on failure
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*/
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static int at91_system_clk_bind(struct udevice *dev)
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{
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return at91_clk_sub_device_bind(dev, "system-clk");
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}
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static const struct udevice_id at91_system_clk_match[] = {
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{ .compatible = "atmel,at91rm9200-clk-system" },
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{}
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};
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U_BOOT_DRIVER(at91_system_clk) = {
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.name = "at91-system-clk",
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.id = UCLASS_MISC,
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.of_match = at91_system_clk_match,
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.bind = at91_system_clk_bind,
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};
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static inline int is_pck(int id)
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{
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return (id >= 8) && (id <= 15);
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}
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static ulong system_clk_get_rate(struct clk *clk)
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{
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struct clk clk_dev;
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int ret;
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ret = clk_get_by_index(clk->dev, 0, &clk_dev);
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if (ret)
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return -EINVAL;
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return clk_get_rate(&clk_dev);
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}
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static ulong system_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct clk clk_dev;
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int ret;
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ret = clk_get_by_index(clk->dev, 0, &clk_dev);
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if (ret)
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return -EINVAL;
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return clk_set_rate(&clk_dev, rate);
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}
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static int system_clk_enable(struct clk *clk)
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{
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struct pmc_plat *plat = dev_get_plat(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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u32 mask;
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if (clk->id > SYSTEM_MAX_ID)
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return -EINVAL;
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mask = BIT(clk->id);
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writel(mask, &pmc->scer);
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/**
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* For the programmable clocks the Ready status in the PMC
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* status register should be checked after enabling.
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* For other clocks this is unnecessary.
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*/
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if (!is_pck(clk->id))
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return 0;
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while (!(readl(&pmc->sr) & mask))
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;
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return 0;
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}
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static struct clk_ops system_clk_ops = {
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.of_xlate = at91_clk_of_xlate,
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.get_rate = system_clk_get_rate,
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.set_rate = system_clk_set_rate,
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.enable = system_clk_enable,
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};
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U_BOOT_DRIVER(system_clk) = {
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.name = "system-clk",
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.id = UCLASS_CLK,
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.probe = at91_clk_probe,
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.plat_auto = sizeof(struct pmc_plat),
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.ops = &system_clk_ops,
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};
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/* Peripheral clock specific code. */
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#define PERIPHERAL_ID_MIN 2
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#define PERIPHERAL_ID_MAX 31
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#define PERIPHERAL_MASK(id) (1 << ((id) & PERIPHERAL_ID_MAX))
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enum periph_clk_type {
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CLK_PERIPH_AT91RM9200 = 0,
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CLK_PERIPH_AT91SAM9X5,
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};
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/**
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* sam9x5_periph_clk_bind() - for the periph clock driver
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* Recursively bind its children as clk devices.
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*
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* @return: 0 on success, or negative error code on failure
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*/
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static int sam9x5_periph_clk_bind(struct udevice *dev)
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{
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return at91_clk_sub_device_bind(dev, "periph-clk");
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}
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static const struct udevice_id sam9x5_periph_clk_match[] = {
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{
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.compatible = "atmel,at91rm9200-clk-peripheral",
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.data = CLK_PERIPH_AT91RM9200,
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},
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{
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.compatible = "atmel,at91sam9x5-clk-peripheral",
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.data = CLK_PERIPH_AT91SAM9X5,
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},
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{}
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};
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U_BOOT_DRIVER(sam9x5_periph_clk) = {
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.name = "sam9x5-periph-clk",
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.id = UCLASS_MISC,
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.of_match = sam9x5_periph_clk_match,
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.bind = sam9x5_periph_clk_bind,
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};
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static int periph_clk_enable(struct clk *clk)
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{
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struct pmc_plat *plat = dev_get_plat(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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enum periph_clk_type clk_type;
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void *addr;
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if (clk->id < PERIPHERAL_ID_MIN)
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return -1;
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clk_type = dev_get_driver_data(dev_get_parent(clk->dev));
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if (clk_type == CLK_PERIPH_AT91RM9200) {
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addr = &pmc->pcer;
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if (clk->id > PERIPHERAL_ID_MAX)
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addr = &pmc->pcer1;
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setbits_le32(addr, PERIPHERAL_MASK(clk->id));
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} else {
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writel(clk->id & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
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setbits_le32(&pmc->pcr,
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AT91_PMC_PCR_CMD_WRITE | AT91_PMC_PCR_EN);
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}
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return 0;
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}
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static ulong periph_get_rate(struct clk *clk)
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{
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struct udevice *dev;
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struct clk clk_dev;
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ulong clk_rate;
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int ret;
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|
|
dev = dev_get_parent(clk->dev);
|
|
|
|
ret = clk_get_by_index(dev, 0, &clk_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
clk_rate = clk_get_rate(&clk_dev);
|
|
|
|
clk_free(&clk_dev);
|
|
|
|
return clk_rate;
|
|
}
|
|
|
|
static struct clk_ops periph_clk_ops = {
|
|
.of_xlate = at91_clk_of_xlate,
|
|
.enable = periph_clk_enable,
|
|
.get_rate = periph_get_rate,
|
|
};
|
|
|
|
U_BOOT_DRIVER(clk_periph) = {
|
|
.name = "periph-clk",
|
|
.id = UCLASS_CLK,
|
|
.plat_auto = sizeof(struct pmc_plat),
|
|
.probe = at91_clk_probe,
|
|
.ops = &periph_clk_ops,
|
|
};
|
|
|
|
/* UTMI clock specific code. */
|
|
#ifdef CONFIG_AT91_UTMI
|
|
|
|
/*
|
|
* 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_plat *plat = dev_get_plat(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_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct pmc_plat *plat = dev_get_plat(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,
|
|
.of_to_plat = utmi_clk_of_to_plat,
|
|
.plat_auto = sizeof(struct pmc_plat),
|
|
.ops = &utmi_clk_ops,
|
|
};
|
|
|
|
#endif /* CONFIG_AT91_UTMI */
|
|
|
|
/* H32MX clock specific code. */
|
|
#ifdef CONFIG_AT91_H32MX
|
|
|
|
#define H32MX_MAX_FREQ 90000000
|
|
|
|
static ulong sama5d4_h32mx_clk_get_rate(struct clk *clk)
|
|
{
|
|
struct pmc_plat *plat = dev_get_plat(clk->dev);
|
|
struct at91_pmc *pmc = plat->reg_base;
|
|
ulong rate = gd->arch.mck_rate_hz;
|
|
|
|
if (readl(&pmc->mckr) & AT91_PMC_MCKR_H32MXDIV)
|
|
rate /= 2;
|
|
|
|
if (rate > H32MX_MAX_FREQ)
|
|
dev_dbg(clk->dev, "H32MX clock is too fast\n");
|
|
|
|
return rate;
|
|
}
|
|
|
|
static struct clk_ops sama5d4_h32mx_clk_ops = {
|
|
.get_rate = sama5d4_h32mx_clk_get_rate,
|
|
};
|
|
|
|
static int sama5d4_h32mx_clk_probe(struct udevice *dev)
|
|
{
|
|
return at91_pmc_core_probe(dev);
|
|
}
|
|
|
|
static const struct udevice_id sama5d4_h32mx_clk_match[] = {
|
|
{ .compatible = "atmel,sama5d4-clk-h32mx" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(sama5d4_h32mx_clk) = {
|
|
.name = "sama5d4-h32mx-clk",
|
|
.id = UCLASS_CLK,
|
|
.of_match = sama5d4_h32mx_clk_match,
|
|
.probe = sama5d4_h32mx_clk_probe,
|
|
.plat_auto = sizeof(struct pmc_plat),
|
|
.ops = &sama5d4_h32mx_clk_ops,
|
|
};
|
|
|
|
#endif /* CONFIG_AT91_H32MX */
|
|
|
|
/* Generic clock specific code. */
|
|
#ifdef CONFIG_AT91_GENERIC_CLK
|
|
|
|
#define GENERATED_SOURCE_MAX 6
|
|
#define GENERATED_MAX_DIV 255
|
|
|
|
/**
|
|
* generated_clk_bind() - for the generated clock driver
|
|
* Recursively bind its children as clk devices.
|
|
*
|
|
* @return: 0 on success, or negative error code on failure
|
|
*/
|
|
static int generated_clk_bind(struct udevice *dev)
|
|
{
|
|
return at91_clk_sub_device_bind(dev, "generic-clk");
|
|
}
|
|
|
|
static const struct udevice_id generated_clk_match[] = {
|
|
{ .compatible = "atmel,sama5d2-clk-generated" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(generated_clk) = {
|
|
.name = "generated-clk",
|
|
.id = UCLASS_MISC,
|
|
.of_match = generated_clk_match,
|
|
.bind = generated_clk_bind,
|
|
};
|
|
|
|
struct generic_clk_priv {
|
|
u32 num_parents;
|
|
};
|
|
|
|
static ulong generic_clk_get_rate(struct clk *clk)
|
|
{
|
|
struct pmc_plat *plat = dev_get_plat(clk->dev);
|
|
struct at91_pmc *pmc = plat->reg_base;
|
|
struct clk parent;
|
|
ulong clk_rate;
|
|
u32 tmp, gckdiv;
|
|
u8 clock_source, parent_index;
|
|
int ret;
|
|
|
|
writel(clk->id & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
|
|
tmp = readl(&pmc->pcr);
|
|
clock_source = (tmp >> AT91_PMC_PCR_GCKCSS_OFFSET) &
|
|
AT91_PMC_PCR_GCKCSS_MASK;
|
|
gckdiv = (tmp >> AT91_PMC_PCR_GCKDIV_OFFSET) & AT91_PMC_PCR_GCKDIV_MASK;
|
|
|
|
parent_index = clock_source - 1;
|
|
ret = clk_get_by_index(dev_get_parent(clk->dev), parent_index, &parent);
|
|
if (ret)
|
|
return 0;
|
|
|
|
clk_rate = clk_get_rate(&parent) / (gckdiv + 1);
|
|
|
|
clk_free(&parent);
|
|
|
|
return clk_rate;
|
|
}
|
|
|
|
static ulong generic_clk_set_rate(struct clk *clk, ulong rate)
|
|
{
|
|
struct pmc_plat *plat = dev_get_plat(clk->dev);
|
|
struct at91_pmc *pmc = plat->reg_base;
|
|
struct generic_clk_priv *priv = dev_get_priv(clk->dev);
|
|
struct clk parent, best_parent;
|
|
ulong tmp_rate, best_rate = rate, parent_rate;
|
|
int tmp_diff, best_diff = -1;
|
|
u32 div, best_div = 0;
|
|
u8 best_parent_index, best_clock_source = 0;
|
|
u8 i;
|
|
u32 tmp;
|
|
int ret;
|
|
|
|
for (i = 0; i < priv->num_parents; i++) {
|
|
ret = clk_get_by_index(dev_get_parent(clk->dev), i, &parent);
|
|
if (ret)
|
|
return ret;
|
|
|
|
parent_rate = clk_get_rate(&parent);
|
|
if (IS_ERR_VALUE(parent_rate))
|
|
return parent_rate;
|
|
|
|
for (div = 1; div < GENERATED_MAX_DIV + 2; div++) {
|
|
tmp_rate = DIV_ROUND_CLOSEST(parent_rate, div);
|
|
tmp_diff = abs(rate - tmp_rate);
|
|
|
|
if (best_diff < 0 || best_diff > tmp_diff) {
|
|
best_rate = tmp_rate;
|
|
best_diff = tmp_diff;
|
|
|
|
best_div = div - 1;
|
|
best_parent = parent;
|
|
best_parent_index = i;
|
|
best_clock_source = best_parent_index + 1;
|
|
}
|
|
|
|
if (!best_diff || tmp_rate < rate)
|
|
break;
|
|
}
|
|
|
|
if (!best_diff)
|
|
break;
|
|
}
|
|
|
|
debug("GCK: best parent: %s, best_rate = %ld, best_div = %d\n",
|
|
best_parent.dev->name, best_rate, best_div);
|
|
|
|
ret = clk_enable(&best_parent);
|
|
if (ret)
|
|
return ret;
|
|
|
|
writel(clk->id & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
|
|
tmp = readl(&pmc->pcr);
|
|
tmp &= ~(AT91_PMC_PCR_GCKDIV | AT91_PMC_PCR_GCKCSS);
|
|
tmp |= AT91_PMC_PCR_GCKCSS_(best_clock_source) |
|
|
AT91_PMC_PCR_CMD_WRITE |
|
|
AT91_PMC_PCR_GCKDIV_(best_div) |
|
|
AT91_PMC_PCR_GCKEN;
|
|
writel(tmp, &pmc->pcr);
|
|
|
|
while (!(readl(&pmc->sr) & AT91_PMC_GCKRDY))
|
|
;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct clk_ops generic_clk_ops = {
|
|
.of_xlate = at91_clk_of_xlate,
|
|
.get_rate = generic_clk_get_rate,
|
|
.set_rate = generic_clk_set_rate,
|
|
};
|
|
|
|
static int generic_clk_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct generic_clk_priv *priv = dev_get_priv(dev);
|
|
u32 cells[GENERATED_SOURCE_MAX];
|
|
u32 num_parents;
|
|
|
|
num_parents = fdtdec_get_int_array_count(gd->fdt_blob,
|
|
dev_of_offset(dev_get_parent(dev)), "clocks", cells,
|
|
GENERATED_SOURCE_MAX);
|
|
|
|
if (!num_parents)
|
|
return -1;
|
|
|
|
priv->num_parents = num_parents;
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(generic_clk) = {
|
|
.name = "generic-clk",
|
|
.id = UCLASS_CLK,
|
|
.probe = at91_clk_probe,
|
|
.of_to_plat = generic_clk_of_to_plat,
|
|
.priv_auto = sizeof(struct generic_clk_priv),
|
|
.plat_auto = sizeof(struct pmc_plat),
|
|
.ops = &generic_clk_ops,
|
|
};
|
|
|
|
#endif /* CONFIG_AT91_GENERIC_CLK */
|
|
|
|
/* USB clock specific code. */
|
|
#ifdef CONFIG_AT91_USB_CLK
|
|
|
|
#define AT91_USB_CLK_SOURCE_MAX 2
|
|
#define AT91_USB_CLK_MAX_DIV 15
|
|
|
|
struct at91_usb_clk_priv {
|
|
u32 num_clksource;
|
|
};
|
|
|
|
static ulong at91_usb_clk_get_rate(struct clk *clk)
|
|
{
|
|
struct pmc_plat *plat = dev_get_plat(clk->dev);
|
|
struct at91_pmc *pmc = plat->reg_base;
|
|
struct clk source;
|
|
u32 tmp, usbdiv;
|
|
u8 source_index;
|
|
int ret;
|
|
|
|
tmp = readl(&pmc->pcr);
|
|
source_index = (tmp >> AT91_PMC_USB_USBS_OFFSET) &
|
|
AT91_PMC_USB_USBS_MASK;
|
|
usbdiv = (tmp >> AT91_PMC_USB_DIV_OFFSET) & AT91_PMC_USB_DIV_MASK;
|
|
|
|
ret = clk_get_by_index(clk->dev, source_index, &source);
|
|
if (ret)
|
|
return 0;
|
|
|
|
return clk_get_rate(&source) / (usbdiv + 1);
|
|
}
|
|
|
|
static ulong at91_usb_clk_set_rate(struct clk *clk, ulong rate)
|
|
{
|
|
struct pmc_plat *plat = dev_get_plat(clk->dev);
|
|
struct at91_pmc *pmc = plat->reg_base;
|
|
struct at91_usb_clk_priv *priv = dev_get_priv(clk->dev);
|
|
struct clk source, best_source;
|
|
ulong tmp_rate, best_rate = rate, source_rate;
|
|
int tmp_diff, best_diff = -1;
|
|
u32 div, best_div = 0;
|
|
u8 best_source_index = 0;
|
|
u8 i;
|
|
u32 tmp;
|
|
int ret;
|
|
|
|
for (i = 0; i < priv->num_clksource; i++) {
|
|
ret = clk_get_by_index(clk->dev, i, &source);
|
|
if (ret)
|
|
return ret;
|
|
|
|
source_rate = clk_get_rate(&source);
|
|
if (IS_ERR_VALUE(source_rate))
|
|
return source_rate;
|
|
|
|
for (div = 1; div < AT91_USB_CLK_MAX_DIV + 2; div++) {
|
|
tmp_rate = DIV_ROUND_CLOSEST(source_rate, div);
|
|
tmp_diff = abs(rate - tmp_rate);
|
|
|
|
if (best_diff < 0 || best_diff > tmp_diff) {
|
|
best_rate = tmp_rate;
|
|
best_diff = tmp_diff;
|
|
|
|
best_div = div - 1;
|
|
best_source = source;
|
|
best_source_index = i;
|
|
}
|
|
|
|
if (!best_diff || tmp_rate < rate)
|
|
break;
|
|
}
|
|
|
|
if (!best_diff)
|
|
break;
|
|
}
|
|
|
|
debug("AT91 USB: best sourc: %s, best_rate = %ld, best_div = %d\n",
|
|
best_source.dev->name, best_rate, best_div);
|
|
|
|
ret = clk_enable(&best_source);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tmp = AT91_PMC_USB_USBS_(best_source_index) |
|
|
AT91_PMC_USB_DIV_(best_div);
|
|
writel(tmp, &pmc->usb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct clk_ops at91_usb_clk_ops = {
|
|
.get_rate = at91_usb_clk_get_rate,
|
|
.set_rate = at91_usb_clk_set_rate,
|
|
};
|
|
|
|
static int at91_usb_clk_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct at91_usb_clk_priv *priv = dev_get_priv(dev);
|
|
u32 cells[AT91_USB_CLK_SOURCE_MAX];
|
|
u32 num_clksource;
|
|
|
|
num_clksource = fdtdec_get_int_array_count(gd->fdt_blob,
|
|
dev_of_offset(dev),
|
|
"clocks", cells,
|
|
AT91_USB_CLK_SOURCE_MAX);
|
|
|
|
if (!num_clksource)
|
|
return -1;
|
|
|
|
priv->num_clksource = num_clksource;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int at91_usb_clk_probe(struct udevice *dev)
|
|
{
|
|
return at91_pmc_core_probe(dev);
|
|
}
|
|
|
|
static const struct udevice_id at91_usb_clk_match[] = {
|
|
{ .compatible = "atmel,at91sam9x5-clk-usb" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(at91_usb_clk) = {
|
|
.name = "at91-usb-clk",
|
|
.id = UCLASS_CLK,
|
|
.of_match = at91_usb_clk_match,
|
|
.probe = at91_usb_clk_probe,
|
|
.of_to_plat = at91_usb_clk_of_to_plat,
|
|
.priv_auto = sizeof(struct at91_usb_clk_priv),
|
|
.plat_auto = sizeof(struct pmc_plat),
|
|
.ops = &at91_usb_clk_ops,
|
|
};
|
|
|
|
#endif /* CONFIG_AT91_USB_CLK */
|