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![Cédric Le Goater](/assets/img/avatar_default.png)
The algorithm in the ast2500_calc_clock_config() routine suffers from integer rounding and the requested rate does not get the appropriate set of Numerator, Denumerator, Post Divider parameters. This is the case for the D2-PLL clock used by the MAC controllers in RGMII mode. The requested rated is 250MHz but a 251MHz is assigned. The easiest way to fix this problem is to introduce an array of clock settings defining the N, M, P parameters for well known frequencies used by the Aspeed SoC. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Joel Stanley <joel@jms.id.au> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
503 lines
13 KiB
C
503 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) Copyright 2016 Google, Inc
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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/io.h>
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#include <asm/arch/scu_ast2500.h>
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#include <dm/lists.h>
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#include <dt-bindings/clock/ast2500-scu.h>
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/*
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* MAC Clock Delay settings, taken from Aspeed SDK
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*/
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#define RGMII_TXCLK_ODLY 8
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#define RMII_RXCLK_IDLY 2
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/*
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* TGMII Clock Duty constants, taken from Aspeed SDK
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*/
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#define RGMII2_TXCK_DUTY 0x66
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#define RGMII1_TXCK_DUTY 0x64
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#define D2PLL_DEFAULT_RATE (250 * 1000 * 1000)
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Clock divider/multiplier configuration struct.
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* For H-PLL and M-PLL the formula is
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* (Output Frequency) = CLKIN * ((M + 1) / (N + 1)) / (P + 1)
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* M - Numerator
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* N - Denumerator
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* P - Post Divider
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* They have the same layout in their control register.
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*
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* D-PLL and D2-PLL have extra divider (OD + 1), which is not
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* yet needed and ignored by clock configurations.
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*/
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struct ast2500_div_config {
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unsigned int num;
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unsigned int denum;
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unsigned int post_div;
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};
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/*
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* Get the rate of the M-PLL clock from input clock frequency and
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* the value of the M-PLL Parameter Register.
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*/
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static ulong ast2500_get_mpll_rate(ulong clkin, u32 mpll_reg)
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{
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const ulong num = (mpll_reg & SCU_MPLL_NUM_MASK) >> SCU_MPLL_NUM_SHIFT;
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const ulong denum = (mpll_reg & SCU_MPLL_DENUM_MASK)
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>> SCU_MPLL_DENUM_SHIFT;
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const ulong post_div = (mpll_reg & SCU_MPLL_POST_MASK)
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>> SCU_MPLL_POST_SHIFT;
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return (clkin * ((num + 1) / (denum + 1))) / (post_div + 1);
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}
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/*
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* Get the rate of the H-PLL clock from input clock frequency and
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* the value of the H-PLL Parameter Register.
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*/
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static ulong ast2500_get_hpll_rate(ulong clkin, u32 hpll_reg)
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{
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const ulong num = (hpll_reg & SCU_HPLL_NUM_MASK) >> SCU_HPLL_NUM_SHIFT;
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const ulong denum = (hpll_reg & SCU_HPLL_DENUM_MASK)
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>> SCU_HPLL_DENUM_SHIFT;
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const ulong post_div = (hpll_reg & SCU_HPLL_POST_MASK)
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>> SCU_HPLL_POST_SHIFT;
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return (clkin * ((num + 1) / (denum + 1))) / (post_div + 1);
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}
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static ulong ast2500_get_clkin(struct ast2500_scu *scu)
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{
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return readl(&scu->hwstrap) & SCU_HWSTRAP_CLKIN_25MHZ
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? 25 * 1000 * 1000 : 24 * 1000 * 1000;
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}
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/**
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* Get current rate or uart clock
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*
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* @scu SCU registers
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* @uart_index UART index, 1-5
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*
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* @return current setting for uart clock rate
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*/
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static ulong ast2500_get_uart_clk_rate(struct ast2500_scu *scu, int uart_index)
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{
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/*
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* ast2500 datasheet is very confusing when it comes to UART clocks,
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* especially when CLKIN = 25 MHz. The settings are in
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* different registers and it is unclear how they interact.
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*
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* This has only been tested with default settings and CLKIN = 24 MHz.
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*/
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ulong uart_clkin;
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if (readl(&scu->misc_ctrl2) &
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(1 << (uart_index - 1 + SCU_MISC2_UARTCLK_SHIFT)))
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uart_clkin = 192 * 1000 * 1000;
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else
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uart_clkin = 24 * 1000 * 1000;
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if (readl(&scu->misc_ctrl1) & SCU_MISC_UARTCLK_DIV13)
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uart_clkin /= 13;
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return uart_clkin;
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}
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static ulong ast2500_clk_get_rate(struct clk *clk)
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{
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struct ast2500_clk_priv *priv = dev_get_priv(clk->dev);
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ulong clkin = ast2500_get_clkin(priv->scu);
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ulong rate;
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switch (clk->id) {
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case PLL_HPLL:
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case ARMCLK:
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/*
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* This ignores dynamic/static slowdown of ARMCLK and may
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* be inaccurate.
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*/
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rate = ast2500_get_hpll_rate(clkin,
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readl(&priv->scu->h_pll_param));
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break;
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case MCLK_DDR:
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rate = ast2500_get_mpll_rate(clkin,
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readl(&priv->scu->m_pll_param));
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break;
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case BCLK_PCLK:
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{
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ulong apb_div = 4 + 4 * ((readl(&priv->scu->clk_sel1)
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& SCU_PCLK_DIV_MASK)
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>> SCU_PCLK_DIV_SHIFT);
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rate = ast2500_get_hpll_rate(clkin,
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readl(&priv->
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scu->h_pll_param));
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rate = rate / apb_div;
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}
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break;
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case PCLK_UART1:
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rate = ast2500_get_uart_clk_rate(priv->scu, 1);
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break;
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case PCLK_UART2:
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rate = ast2500_get_uart_clk_rate(priv->scu, 2);
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break;
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case PCLK_UART3:
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rate = ast2500_get_uart_clk_rate(priv->scu, 3);
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break;
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case PCLK_UART4:
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rate = ast2500_get_uart_clk_rate(priv->scu, 4);
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break;
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case PCLK_UART5:
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rate = ast2500_get_uart_clk_rate(priv->scu, 5);
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break;
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default:
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return -ENOENT;
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}
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return rate;
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}
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struct ast2500_clock_config {
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ulong input_rate;
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ulong rate;
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struct ast2500_div_config cfg;
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};
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static const struct ast2500_clock_config ast2500_clock_config_defaults[] = {
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{ 24000000, 250000000, { .num = 124, .denum = 1, .post_div = 5 } },
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};
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static bool ast2500_get_clock_config_default(ulong input_rate,
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ulong requested_rate,
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struct ast2500_div_config *cfg)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ast2500_clock_config_defaults); i++) {
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const struct ast2500_clock_config *default_cfg =
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&ast2500_clock_config_defaults[i];
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if (default_cfg->input_rate == input_rate &&
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default_cfg->rate == requested_rate) {
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*cfg = default_cfg->cfg;
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return true;
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}
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}
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return false;
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}
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/*
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* @input_rate - the rate of input clock in Hz
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* @requested_rate - desired output rate in Hz
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* @div - this is an IN/OUT parameter, at input all fields of the config
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* need to be set to their maximum allowed values.
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* The result (the best config we could find), would also be returned
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* in this structure.
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*
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* @return The clock rate, when the resulting div_config is used.
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*/
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static ulong ast2500_calc_clock_config(ulong input_rate, ulong requested_rate,
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struct ast2500_div_config *cfg)
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{
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/*
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* The assumption is that kHz precision is good enough and
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* also enough to avoid overflow when multiplying.
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*/
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const ulong input_rate_khz = input_rate / 1000;
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const ulong rate_khz = requested_rate / 1000;
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const struct ast2500_div_config max_vals = *cfg;
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struct ast2500_div_config it = { 0, 0, 0 };
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ulong delta = rate_khz;
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ulong new_rate_khz = 0;
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/*
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* Look for a well known frequency first.
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*/
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if (ast2500_get_clock_config_default(input_rate, requested_rate, cfg))
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return requested_rate;
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for (; it.denum <= max_vals.denum; ++it.denum) {
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for (it.post_div = 0; it.post_div <= max_vals.post_div;
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++it.post_div) {
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it.num = (rate_khz * (it.post_div + 1) / input_rate_khz)
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* (it.denum + 1);
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if (it.num > max_vals.num)
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continue;
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new_rate_khz = (input_rate_khz
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* ((it.num + 1) / (it.denum + 1)))
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/ (it.post_div + 1);
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/* Keep the rate below requested one. */
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if (new_rate_khz > rate_khz)
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continue;
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if (new_rate_khz - rate_khz < delta) {
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delta = new_rate_khz - rate_khz;
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*cfg = it;
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if (delta == 0)
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return new_rate_khz * 1000;
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}
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}
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}
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return new_rate_khz * 1000;
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}
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static ulong ast2500_configure_ddr(struct ast2500_scu *scu, ulong rate)
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{
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ulong clkin = ast2500_get_clkin(scu);
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u32 mpll_reg;
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struct ast2500_div_config div_cfg = {
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.num = (SCU_MPLL_NUM_MASK >> SCU_MPLL_NUM_SHIFT),
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.denum = (SCU_MPLL_DENUM_MASK >> SCU_MPLL_DENUM_SHIFT),
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.post_div = (SCU_MPLL_POST_MASK >> SCU_MPLL_POST_SHIFT),
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};
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ast2500_calc_clock_config(clkin, rate, &div_cfg);
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mpll_reg = readl(&scu->m_pll_param);
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mpll_reg &= ~(SCU_MPLL_POST_MASK | SCU_MPLL_NUM_MASK
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| SCU_MPLL_DENUM_MASK);
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mpll_reg |= (div_cfg.post_div << SCU_MPLL_POST_SHIFT)
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| (div_cfg.num << SCU_MPLL_NUM_SHIFT)
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| (div_cfg.denum << SCU_MPLL_DENUM_SHIFT);
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ast_scu_unlock(scu);
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writel(mpll_reg, &scu->m_pll_param);
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ast_scu_lock(scu);
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return ast2500_get_mpll_rate(clkin, mpll_reg);
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}
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static ulong ast2500_configure_mac(struct ast2500_scu *scu, int index)
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{
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ulong clkin = ast2500_get_clkin(scu);
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ulong hpll_rate = ast2500_get_hpll_rate(clkin,
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readl(&scu->h_pll_param));
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ulong required_rate;
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u32 hwstrap;
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u32 divisor;
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u32 reset_bit;
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u32 clkstop_bit;
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/*
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* According to data sheet, for 10/100 mode the MAC clock frequency
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* should be at least 25MHz and for 1000 mode at least 100MHz
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*/
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hwstrap = readl(&scu->hwstrap);
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if (hwstrap & (SCU_HWSTRAP_MAC1_RGMII | SCU_HWSTRAP_MAC2_RGMII))
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required_rate = 100 * 1000 * 1000;
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else
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required_rate = 25 * 1000 * 1000;
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divisor = hpll_rate / required_rate;
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if (divisor < 4) {
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/* Clock can't run fast enough, but let's try anyway */
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debug("MAC clock too slow\n");
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divisor = 4;
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} else if (divisor > 16) {
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/* Can't slow down the clock enough, but let's try anyway */
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debug("MAC clock too fast\n");
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divisor = 16;
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}
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switch (index) {
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case 1:
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reset_bit = SCU_SYSRESET_MAC1;
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clkstop_bit = SCU_CLKSTOP_MAC1;
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break;
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case 2:
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reset_bit = SCU_SYSRESET_MAC2;
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clkstop_bit = SCU_CLKSTOP_MAC2;
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break;
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default:
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return -EINVAL;
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}
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ast_scu_unlock(scu);
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clrsetbits_le32(&scu->clk_sel1, SCU_MACCLK_MASK,
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((divisor - 2) / 2) << SCU_MACCLK_SHIFT);
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/*
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* Disable MAC, start its clock and re-enable it.
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* The procedure and the delays (100us & 10ms) are
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* specified in the datasheet.
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*/
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setbits_le32(&scu->sysreset_ctrl1, reset_bit);
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udelay(100);
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clrbits_le32(&scu->clk_stop_ctrl1, clkstop_bit);
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mdelay(10);
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clrbits_le32(&scu->sysreset_ctrl1, reset_bit);
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writel((RGMII2_TXCK_DUTY << SCU_CLKDUTY_RGMII2TXCK_SHIFT)
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| (RGMII1_TXCK_DUTY << SCU_CLKDUTY_RGMII1TXCK_SHIFT),
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&scu->clk_duty_sel);
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ast_scu_lock(scu);
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return required_rate;
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}
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static ulong ast2500_configure_d2pll(struct ast2500_scu *scu, ulong rate)
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{
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/*
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* The values and the meaning of the next three
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* parameters are undocumented. Taken from Aspeed SDK.
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*
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* TODO(clg@kaod.org): the SIP and SIC values depend on the
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* Numerator value
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*/
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const u32 d2_pll_ext_param = 0x2c;
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const u32 d2_pll_sip = 0x11;
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const u32 d2_pll_sic = 0x18;
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u32 clk_delay_settings =
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(RMII_RXCLK_IDLY << SCU_MICDS_MAC1RMII_RDLY_SHIFT)
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| (RMII_RXCLK_IDLY << SCU_MICDS_MAC2RMII_RDLY_SHIFT)
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| (RGMII_TXCLK_ODLY << SCU_MICDS_MAC1RGMII_TXDLY_SHIFT)
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| (RGMII_TXCLK_ODLY << SCU_MICDS_MAC2RGMII_TXDLY_SHIFT);
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struct ast2500_div_config div_cfg = {
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.num = SCU_D2PLL_NUM_MASK >> SCU_D2PLL_NUM_SHIFT,
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.denum = SCU_D2PLL_DENUM_MASK >> SCU_D2PLL_DENUM_SHIFT,
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.post_div = SCU_D2PLL_POST_MASK >> SCU_D2PLL_POST_SHIFT,
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};
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ulong clkin = ast2500_get_clkin(scu);
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ulong new_rate;
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ast_scu_unlock(scu);
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writel((d2_pll_ext_param << SCU_D2PLL_EXT1_PARAM_SHIFT)
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| SCU_D2PLL_EXT1_OFF
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| SCU_D2PLL_EXT1_RESET, &scu->d2_pll_ext_param[0]);
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/*
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* Select USB2.0 port1 PHY clock as a clock source for GCRT.
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* This would disconnect it from D2-PLL.
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*/
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clrsetbits_le32(&scu->misc_ctrl1, SCU_MISC_D2PLL_OFF,
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SCU_MISC_GCRT_USB20CLK);
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new_rate = ast2500_calc_clock_config(clkin, rate, &div_cfg);
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writel((d2_pll_sip << SCU_D2PLL_SIP_SHIFT)
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| (d2_pll_sic << SCU_D2PLL_SIC_SHIFT)
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| (div_cfg.num << SCU_D2PLL_NUM_SHIFT)
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| (div_cfg.denum << SCU_D2PLL_DENUM_SHIFT)
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| (div_cfg.post_div << SCU_D2PLL_POST_SHIFT),
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&scu->d2_pll_param);
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clrbits_le32(&scu->d2_pll_ext_param[0],
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SCU_D2PLL_EXT1_OFF | SCU_D2PLL_EXT1_RESET);
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clrsetbits_le32(&scu->misc_ctrl2,
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SCU_MISC2_RGMII_HPLL | SCU_MISC2_RMII_MPLL
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| SCU_MISC2_RGMII_CLKDIV_MASK |
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SCU_MISC2_RMII_CLKDIV_MASK,
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(4 << SCU_MISC2_RMII_CLKDIV_SHIFT));
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writel(clk_delay_settings | SCU_MICDS_RGMIIPLL, &scu->mac_clk_delay);
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writel(clk_delay_settings, &scu->mac_clk_delay_100M);
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writel(clk_delay_settings, &scu->mac_clk_delay_10M);
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ast_scu_lock(scu);
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return new_rate;
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}
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static ulong ast2500_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct ast2500_clk_priv *priv = dev_get_priv(clk->dev);
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ulong new_rate;
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switch (clk->id) {
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case PLL_MPLL:
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case MCLK_DDR:
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new_rate = ast2500_configure_ddr(priv->scu, rate);
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break;
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case PLL_D2PLL:
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new_rate = ast2500_configure_d2pll(priv->scu, rate);
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break;
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default:
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return -ENOENT;
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}
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return new_rate;
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}
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static int ast2500_clk_enable(struct clk *clk)
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{
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struct ast2500_clk_priv *priv = dev_get_priv(clk->dev);
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switch (clk->id) {
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/*
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* For MAC clocks the clock rate is
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* configured based on whether RGMII or RMII mode has been selected
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* through hardware strapping.
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*/
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case PCLK_MAC1:
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ast2500_configure_mac(priv->scu, 1);
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break;
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case PCLK_MAC2:
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ast2500_configure_mac(priv->scu, 2);
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break;
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case PLL_D2PLL:
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ast2500_configure_d2pll(priv->scu, D2PLL_DEFAULT_RATE);
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break;
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default:
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return -ENOENT;
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}
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return 0;
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}
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struct clk_ops ast2500_clk_ops = {
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.get_rate = ast2500_clk_get_rate,
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.set_rate = ast2500_clk_set_rate,
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.enable = ast2500_clk_enable,
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};
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static int ast2500_clk_probe(struct udevice *dev)
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|
{
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|
struct ast2500_clk_priv *priv = dev_get_priv(dev);
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|
|
|
priv->scu = devfdt_get_addr_ptr(dev);
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|
if (IS_ERR(priv->scu))
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return PTR_ERR(priv->scu);
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|
|
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return 0;
|
|
}
|
|
|
|
static int ast2500_clk_bind(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
|
|
/* The reset driver does not have a device node, so bind it here */
|
|
ret = device_bind_driver(gd->dm_root, "ast_sysreset", "reset", &dev);
|
|
if (ret)
|
|
debug("Warning: No reset driver: ret=%d\n", ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id ast2500_clk_ids[] = {
|
|
{ .compatible = "aspeed,ast2500-scu" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(aspeed_ast2500_scu) = {
|
|
.name = "aspeed_ast2500_scu",
|
|
.id = UCLASS_CLK,
|
|
.of_match = ast2500_clk_ids,
|
|
.priv_auto_alloc_size = sizeof(struct ast2500_clk_priv),
|
|
.ops = &ast2500_clk_ops,
|
|
.bind = ast2500_clk_bind,
|
|
.probe = ast2500_clk_probe,
|
|
};
|