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https://github.com/AsahiLinux/u-boot
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14b7fba31f
Add memory clock manager driver for N5X. Provides memory clock initialization and enable functions. Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2021 Intel Corporation <www.intel.com>
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*/
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#include <common.h>
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#include <asm/arch/clock_manager.h>
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#include <asm/global_data.h>
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#include <asm/io.h>
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#include "clk-mem-n5x.h"
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#include <clk-uclass.h>
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#include <dm.h>
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#include <dm/lists.h>
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#include <dm/util.h>
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#include <dt-bindings/clock/n5x-clock.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct socfpga_mem_clk_plat {
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void __iomem *regs;
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};
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void clk_mem_wait_for_lock(struct socfpga_mem_clk_plat *plat, u32 mask)
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{
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u32 inter_val;
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u32 retry = 0;
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do {
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inter_val = CM_REG_READL(plat, MEMCLKMGR_STAT) & mask;
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/* Wait for stable lock */
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if (inter_val == mask)
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retry++;
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else
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retry = 0;
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if (retry >= 10)
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return;
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} while (1);
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}
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/*
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* function to write the bypass register which requires a poll of the
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* busy bit
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*/
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void clk_mem_write_bypass_mempll(struct socfpga_mem_clk_plat *plat, u32 val)
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{
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CM_REG_WRITEL(plat, val, MEMCLKMGR_MEMPLL_BYPASS);
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}
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/*
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* Setup clocks while making no assumptions about previous state of the clocks.
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*/
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static void clk_mem_basic_init(struct udevice *dev,
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const struct cm_config * const cfg)
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{
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struct socfpga_mem_clk_plat *plat = dev_get_plat(dev);
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if (!cfg)
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return;
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/* Put PLLs in bypass */
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clk_mem_write_bypass_mempll(plat, MEMCLKMGR_BYPASS_MEMPLL_ALL);
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/* Put PLLs in Reset */
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CM_REG_SETBITS(plat, MEMCLKMGR_MEMPLL_PLLCTRL,
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MEMCLKMGR_PLLCTRL_BYPASS_MASK);
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/* setup mem PLL */
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CM_REG_WRITEL(plat, cfg->mem_memdiv, MEMCLKMGR_MEMPLL_MEMDIV);
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CM_REG_WRITEL(plat, cfg->mem_pllglob, MEMCLKMGR_MEMPLL_PLLGLOB);
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CM_REG_WRITEL(plat, cfg->mem_plldiv, MEMCLKMGR_MEMPLL_PLLDIV);
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CM_REG_WRITEL(plat, cfg->mem_plloutdiv, MEMCLKMGR_MEMPLL_PLLOUTDIV);
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/* Take PLL out of reset and power up */
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CM_REG_CLRBITS(plat, MEMCLKMGR_MEMPLL_PLLCTRL,
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MEMCLKMGR_PLLCTRL_BYPASS_MASK);
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}
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static int socfpga_mem_clk_enable(struct clk *clk)
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{
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const struct cm_config *cm_default_cfg = cm_get_default_config();
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struct socfpga_mem_clk_plat *plat = dev_get_plat(clk->dev);
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clk_mem_basic_init(clk->dev, cm_default_cfg);
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clk_mem_wait_for_lock(plat, MEMCLKMGR_STAT_ALLPLL_LOCKED_MASK);
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CM_REG_WRITEL(plat, CM_REG_READL(plat, MEMCLKMGR_MEMPLL_PLLGLOB) |
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MEMCLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK,
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MEMCLKMGR_MEMPLL_PLLGLOB);
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/* Take all PLLs out of bypass */
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clk_mem_write_bypass_mempll(plat, 0);
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/* Clear the loss of lock bits (write 1 to clear) */
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CM_REG_CLRBITS(plat, MEMCLKMGR_INTRCLR,
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MEMCLKMGR_INTER_MEMPLLLOST_MASK);
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/* Take all ping pong counters out of reset */
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CM_REG_CLRBITS(plat, MEMCLKMGR_MEMPLL_EXTCNTRST,
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MEMCLKMGR_EXTCNTRST_ALLCNTRST);
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return 0;
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}
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static int socfpga_mem_clk_of_to_plat(struct udevice *dev)
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{
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struct socfpga_mem_clk_plat *plat = dev_get_plat(dev);
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fdt_addr_t addr;
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addr = devfdt_get_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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plat->regs = (void __iomem *)addr;
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return 0;
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}
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static struct clk_ops socfpga_mem_clk_ops = {
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.enable = socfpga_mem_clk_enable
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};
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static const struct udevice_id socfpga_mem_clk_match[] = {
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{ .compatible = "intel,n5x-mem-clkmgr" },
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{}
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};
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U_BOOT_DRIVER(socfpga_n5x_mem_clk) = {
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.name = "mem-clk-n5x",
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.id = UCLASS_CLK,
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.of_match = socfpga_mem_clk_match,
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.ops = &socfpga_mem_clk_ops,
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.of_to_plat = socfpga_mem_clk_of_to_plat,
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.plat_auto = sizeof(struct socfpga_mem_clk_plat),
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};
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