mirror of
https://github.com/AsahiLinux/u-boot
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e96e2132f9
This adds a helper function for clk_get_by_name in cases where the clock is optional. Hopefully this helps point driver writers in the right direction. Also convert some existing users. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Simon Glass <sjg@chromium.org> Link: https://lore.kernel.org/r/20220115205247.566210-2-seanga2@gmail.com
502 lines
12 KiB
C
502 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Weidmüller Interface GmbH & Co. KG
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* Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
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*
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* Copyright (C) 2013 Soren Brinkmann <soren.brinkmann@xilinx.com>
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* Copyright (C) 2013 Xilinx, Inc. All rights reserved.
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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 <log.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 <errno.h>
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#include <asm/io.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/sys_proto.h>
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/* Register bitfield defines */
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#define PLLCTRL_FBDIV_MASK 0x7f000
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#define PLLCTRL_FBDIV_SHIFT 12
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#define PLLCTRL_BPFORCE_MASK (1 << 4)
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#define PLLCTRL_PWRDWN_MASK 2
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#define PLLCTRL_PWRDWN_SHIFT 1
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#define PLLCTRL_RESET_MASK 1
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#define PLLCTRL_RESET_SHIFT 0
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#define ZYNQ_CLK_MAXDIV 0x3f
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#define CLK_CTRL_DIV1_SHIFT 20
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#define CLK_CTRL_DIV1_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV1_SHIFT)
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#define CLK_CTRL_DIV0_SHIFT 8
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#define CLK_CTRL_DIV0_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV0_SHIFT)
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#define CLK_CTRL_SRCSEL_SHIFT 4
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#define CLK_CTRL_SRCSEL_MASK (0x3 << CLK_CTRL_SRCSEL_SHIFT)
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#define CLK_CTRL_DIV2X_SHIFT 26
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#define CLK_CTRL_DIV2X_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV2X_SHIFT)
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#define CLK_CTRL_DIV3X_SHIFT 20
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#define CLK_CTRL_DIV3X_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV3X_SHIFT)
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DECLARE_GLOBAL_DATA_PTR;
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#ifndef CONFIG_SPL_BUILD
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enum zynq_clk_rclk {mio_clk, emio_clk};
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#endif
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struct zynq_clk_priv {
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ulong ps_clk_freq;
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#ifndef CONFIG_SPL_BUILD
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struct clk gem_emio_clk[2];
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#endif
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};
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static void *zynq_clk_get_register(enum zynq_clk id)
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{
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switch (id) {
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case armpll_clk:
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return &slcr_base->arm_pll_ctrl;
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case ddrpll_clk:
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return &slcr_base->ddr_pll_ctrl;
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case iopll_clk:
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return &slcr_base->io_pll_ctrl;
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case lqspi_clk:
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return &slcr_base->lqspi_clk_ctrl;
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case smc_clk:
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return &slcr_base->smc_clk_ctrl;
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case pcap_clk:
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return &slcr_base->pcap_clk_ctrl;
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case sdio0_clk ... sdio1_clk:
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return &slcr_base->sdio_clk_ctrl;
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case uart0_clk ... uart1_clk:
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return &slcr_base->uart_clk_ctrl;
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case spi0_clk ... spi1_clk:
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return &slcr_base->spi_clk_ctrl;
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#ifndef CONFIG_SPL_BUILD
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case dci_clk:
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return &slcr_base->dci_clk_ctrl;
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case gem0_clk:
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return &slcr_base->gem0_clk_ctrl;
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case gem1_clk:
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return &slcr_base->gem1_clk_ctrl;
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case fclk0_clk:
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return &slcr_base->fpga0_clk_ctrl;
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case fclk1_clk:
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return &slcr_base->fpga1_clk_ctrl;
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case fclk2_clk:
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return &slcr_base->fpga2_clk_ctrl;
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case fclk3_clk:
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return &slcr_base->fpga3_clk_ctrl;
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case can0_clk ... can1_clk:
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return &slcr_base->can_clk_ctrl;
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case dbg_trc_clk ... dbg_apb_clk:
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/* fall through */
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#endif
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default:
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return &slcr_base->dbg_clk_ctrl;
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}
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}
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static enum zynq_clk zynq_clk_get_cpu_pll(u32 clk_ctrl)
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{
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u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
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switch (srcsel) {
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case 2:
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return ddrpll_clk;
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case 3:
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return iopll_clk;
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case 0 ... 1:
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default:
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return armpll_clk;
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}
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}
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static enum zynq_clk zynq_clk_get_peripheral_pll(u32 clk_ctrl)
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{
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u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
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switch (srcsel) {
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case 2:
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return armpll_clk;
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case 3:
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return ddrpll_clk;
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case 0 ... 1:
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default:
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return iopll_clk;
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}
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}
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static ulong zynq_clk_get_pll_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
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{
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u32 clk_ctrl, reset, pwrdwn, mul, bypass;
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clk_ctrl = readl(zynq_clk_get_register(id));
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reset = (clk_ctrl & PLLCTRL_RESET_MASK) >> PLLCTRL_RESET_SHIFT;
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pwrdwn = (clk_ctrl & PLLCTRL_PWRDWN_MASK) >> PLLCTRL_PWRDWN_SHIFT;
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if (reset || pwrdwn)
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return 0;
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bypass = clk_ctrl & PLLCTRL_BPFORCE_MASK;
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if (bypass)
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mul = 1;
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else
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mul = (clk_ctrl & PLLCTRL_FBDIV_MASK) >> PLLCTRL_FBDIV_SHIFT;
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return priv->ps_clk_freq * mul;
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}
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#ifndef CONFIG_SPL_BUILD
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static enum zynq_clk_rclk zynq_clk_get_gem_rclk(enum zynq_clk id)
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{
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u32 clk_ctrl, srcsel;
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if (id == gem0_clk)
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clk_ctrl = readl(&slcr_base->gem0_rclk_ctrl);
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else
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clk_ctrl = readl(&slcr_base->gem1_rclk_ctrl);
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srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
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if (srcsel)
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return emio_clk;
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else
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return mio_clk;
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}
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#endif
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static ulong zynq_clk_get_cpu_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
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{
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u32 clk_621, clk_ctrl, div;
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enum zynq_clk pll;
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clk_ctrl = readl(&slcr_base->arm_clk_ctrl);
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div = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
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switch (id) {
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case cpu_1x_clk:
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div *= 2;
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/* fall through */
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case cpu_2x_clk:
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clk_621 = readl(&slcr_base->clk_621_true) & 1;
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div *= 2 + clk_621;
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break;
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case cpu_3or2x_clk:
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div *= 2;
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/* fall through */
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case cpu_6or4x_clk:
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break;
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default:
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return 0;
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}
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pll = zynq_clk_get_cpu_pll(clk_ctrl);
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return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, pll), div);
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}
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#ifndef CONFIG_SPL_BUILD
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static ulong zynq_clk_get_ddr2x_rate(struct zynq_clk_priv *priv)
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{
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u32 clk_ctrl, div;
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clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);
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div = (clk_ctrl & CLK_CTRL_DIV2X_MASK) >> CLK_CTRL_DIV2X_SHIFT;
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return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
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}
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#endif
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static ulong zynq_clk_get_ddr3x_rate(struct zynq_clk_priv *priv)
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{
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u32 clk_ctrl, div;
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clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);
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div = (clk_ctrl & CLK_CTRL_DIV3X_MASK) >> CLK_CTRL_DIV3X_SHIFT;
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return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
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}
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#ifndef CONFIG_SPL_BUILD
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static ulong zynq_clk_get_dci_rate(struct zynq_clk_priv *priv)
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{
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u32 clk_ctrl, div0, div1;
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clk_ctrl = readl(&slcr_base->dci_clk_ctrl);
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div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
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div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
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return DIV_ROUND_CLOSEST(DIV_ROUND_CLOSEST(
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zynq_clk_get_pll_rate(priv, ddrpll_clk), div0), div1);
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}
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#endif
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static ulong zynq_clk_get_peripheral_rate(struct zynq_clk_priv *priv,
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enum zynq_clk id, bool two_divs)
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{
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enum zynq_clk pll;
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u32 clk_ctrl, div0;
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u32 div1 = 1;
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clk_ctrl = readl(zynq_clk_get_register(id));
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div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
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if (!div0)
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div0 = 1;
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#ifndef CONFIG_SPL_BUILD
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if (two_divs) {
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div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
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if (!div1)
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div1 = 1;
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}
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#endif
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pll = zynq_clk_get_peripheral_pll(clk_ctrl);
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return
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DIV_ROUND_CLOSEST(
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DIV_ROUND_CLOSEST(
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zynq_clk_get_pll_rate(priv, pll), div0),
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div1);
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}
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#ifndef CONFIG_SPL_BUILD
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static ulong zynq_clk_get_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
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{
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struct clk *parent;
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if (zynq_clk_get_gem_rclk(id) == mio_clk)
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return zynq_clk_get_peripheral_rate(priv, id, true);
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parent = &priv->gem_emio_clk[id - gem0_clk];
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if (parent->dev)
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return clk_get_rate(parent);
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debug("%s: gem%d emio rx clock source unknown\n", __func__,
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id - gem0_clk);
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return -ENOSYS;
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}
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static unsigned long zynq_clk_calc_peripheral_two_divs(ulong rate,
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ulong pll_rate,
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u32 *div0, u32 *div1)
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{
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long new_err, best_err = (long)(~0UL >> 1);
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ulong new_rate, best_rate = 0;
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u32 d0, d1;
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for (d0 = 1; d0 <= ZYNQ_CLK_MAXDIV; d0++) {
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for (d1 = 1; d1 <= ZYNQ_CLK_MAXDIV >> 1; d1++) {
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new_rate = DIV_ROUND_CLOSEST(
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DIV_ROUND_CLOSEST(pll_rate, d0), d1);
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new_err = abs(new_rate - rate);
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if (new_err < best_err) {
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*div0 = d0;
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*div1 = d1;
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best_err = new_err;
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best_rate = new_rate;
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}
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}
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}
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return best_rate;
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}
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static ulong zynq_clk_set_peripheral_rate(struct zynq_clk_priv *priv,
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enum zynq_clk id, ulong rate,
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bool two_divs)
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{
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enum zynq_clk pll;
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u32 clk_ctrl, div0 = 0, div1 = 0;
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ulong pll_rate, new_rate;
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u32 *reg;
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reg = zynq_clk_get_register(id);
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clk_ctrl = readl(reg);
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pll = zynq_clk_get_peripheral_pll(clk_ctrl);
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pll_rate = zynq_clk_get_pll_rate(priv, pll);
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clk_ctrl &= ~CLK_CTRL_DIV0_MASK;
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if (two_divs) {
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clk_ctrl &= ~CLK_CTRL_DIV1_MASK;
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new_rate = zynq_clk_calc_peripheral_two_divs(rate, pll_rate,
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&div0, &div1);
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clk_ctrl |= div1 << CLK_CTRL_DIV1_SHIFT;
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} else {
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div0 = DIV_ROUND_CLOSEST(pll_rate, rate);
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if (div0 > ZYNQ_CLK_MAXDIV)
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div0 = ZYNQ_CLK_MAXDIV;
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new_rate = DIV_ROUND_CLOSEST(rate, div0);
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}
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clk_ctrl |= div0 << CLK_CTRL_DIV0_SHIFT;
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zynq_slcr_unlock();
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writel(clk_ctrl, reg);
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zynq_slcr_lock();
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return new_rate;
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}
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static ulong zynq_clk_set_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id,
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ulong rate)
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{
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struct clk *parent;
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if (zynq_clk_get_gem_rclk(id) == mio_clk)
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return zynq_clk_set_peripheral_rate(priv, id, rate, true);
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parent = &priv->gem_emio_clk[id - gem0_clk];
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if (parent->dev)
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return clk_set_rate(parent, rate);
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debug("%s: gem%d emio rx clock source unknown\n", __func__,
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id - gem0_clk);
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return -ENOSYS;
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}
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#endif
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#ifndef CONFIG_SPL_BUILD
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static ulong zynq_clk_get_rate(struct clk *clk)
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{
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struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
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enum zynq_clk id = clk->id;
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bool two_divs = false;
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switch (id) {
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case armpll_clk ... iopll_clk:
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return zynq_clk_get_pll_rate(priv, id);
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case cpu_6or4x_clk ... cpu_1x_clk:
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return zynq_clk_get_cpu_rate(priv, id);
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case ddr2x_clk:
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return zynq_clk_get_ddr2x_rate(priv);
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case ddr3x_clk:
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return zynq_clk_get_ddr3x_rate(priv);
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case dci_clk:
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return zynq_clk_get_dci_rate(priv);
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case gem0_clk ... gem1_clk:
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return zynq_clk_get_gem_rate(priv, id);
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case fclk0_clk ... can1_clk:
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two_divs = true;
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/* fall through */
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case dbg_trc_clk ... dbg_apb_clk:
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case lqspi_clk ... pcap_clk:
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case sdio0_clk ... spi1_clk:
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return zynq_clk_get_peripheral_rate(priv, id, two_divs);
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case dma_clk:
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return zynq_clk_get_cpu_rate(priv, cpu_2x_clk);
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case usb0_aper_clk ... swdt_clk:
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return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
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default:
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return -ENXIO;
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}
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}
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static ulong zynq_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
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enum zynq_clk id = clk->id;
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bool two_divs = false;
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switch (id) {
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case gem0_clk ... gem1_clk:
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return zynq_clk_set_gem_rate(priv, id, rate);
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case fclk0_clk ... can1_clk:
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two_divs = true;
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/* fall through */
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case lqspi_clk ... pcap_clk:
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case sdio0_clk ... spi1_clk:
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case dbg_trc_clk ... dbg_apb_clk:
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return zynq_clk_set_peripheral_rate(priv, id, rate, two_divs);
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default:
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return -ENXIO;
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}
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}
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#else
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static ulong zynq_clk_get_rate(struct clk *clk)
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{
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struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
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enum zynq_clk id = clk->id;
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switch (id) {
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case cpu_6or4x_clk ... cpu_1x_clk:
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return zynq_clk_get_cpu_rate(priv, id);
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case ddr3x_clk:
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return zynq_clk_get_ddr3x_rate(priv);
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case lqspi_clk ... pcap_clk:
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case sdio0_clk ... spi1_clk:
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return zynq_clk_get_peripheral_rate(priv, id, 0);
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case i2c0_aper_clk ... i2c1_aper_clk:
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return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
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default:
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return -ENXIO;
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}
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}
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#endif
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static int dummy_enable(struct clk *clk)
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{
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/*
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* Add implementation but by default all clocks are enabled
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* after power up which is only one supported case now.
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*/
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return 0;
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}
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static struct clk_ops zynq_clk_ops = {
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.get_rate = zynq_clk_get_rate,
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#ifndef CONFIG_SPL_BUILD
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.set_rate = zynq_clk_set_rate,
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#endif
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.enable = dummy_enable,
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};
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static int zynq_clk_probe(struct udevice *dev)
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{
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struct zynq_clk_priv *priv = dev_get_priv(dev);
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#ifndef CONFIG_SPL_BUILD
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unsigned int i;
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char name[16];
|
|
int ret;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
sprintf(name, "gem%d_emio_clk", i);
|
|
ret = clk_get_by_name_optional(dev, name,
|
|
&priv->gem_emio_clk[i]);
|
|
if (ret) {
|
|
dev_err(dev, "failed to get %s clock\n", name);
|
|
return ret;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
priv->ps_clk_freq = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
|
|
"ps-clk-frequency", 33333333UL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id zynq_clk_ids[] = {
|
|
{ .compatible = "xlnx,ps7-clkc"},
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(zynq_clk) = {
|
|
.name = "zynq_clk",
|
|
.id = UCLASS_CLK,
|
|
.of_match = zynq_clk_ids,
|
|
.ops = &zynq_clk_ops,
|
|
.priv_auto = sizeof(struct zynq_clk_priv),
|
|
.probe = zynq_clk_probe,
|
|
};
|