381 lines
9.1 KiB
C
381 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Baylibre, SAS.
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* Author: Jerome Brunet <jbrunet@baylibre.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/mdio-mux.h>
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#include <linux/module.h>
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#include <linux/phy.h>
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#include <linux/platform_device.h>
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#define ETH_PLL_STS 0x40
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#define ETH_PLL_CTL0 0x44
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#define PLL_CTL0_LOCK_DIG BIT(30)
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#define PLL_CTL0_RST BIT(29)
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#define PLL_CTL0_EN BIT(28)
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#define PLL_CTL0_SEL BIT(23)
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#define PLL_CTL0_N GENMASK(14, 10)
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#define PLL_CTL0_M GENMASK(8, 0)
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#define PLL_LOCK_TIMEOUT 1000000
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#define PLL_MUX_NUM_PARENT 2
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#define ETH_PLL_CTL1 0x48
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#define ETH_PLL_CTL2 0x4c
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#define ETH_PLL_CTL3 0x50
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#define ETH_PLL_CTL4 0x54
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#define ETH_PLL_CTL5 0x58
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#define ETH_PLL_CTL6 0x5c
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#define ETH_PLL_CTL7 0x60
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#define ETH_PHY_CNTL0 0x80
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#define EPHY_G12A_ID 0x33010180
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#define ETH_PHY_CNTL1 0x84
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#define PHY_CNTL1_ST_MODE GENMASK(2, 0)
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#define PHY_CNTL1_ST_PHYADD GENMASK(7, 3)
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#define EPHY_DFLT_ADD 8
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#define PHY_CNTL1_MII_MODE GENMASK(15, 14)
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#define EPHY_MODE_RMII 0x1
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#define PHY_CNTL1_CLK_EN BIT(16)
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#define PHY_CNTL1_CLKFREQ BIT(17)
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#define PHY_CNTL1_PHY_ENB BIT(18)
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#define ETH_PHY_CNTL2 0x88
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#define PHY_CNTL2_USE_INTERNAL BIT(5)
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#define PHY_CNTL2_SMI_SRC_MAC BIT(6)
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#define PHY_CNTL2_RX_CLK_EPHY BIT(9)
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#define MESON_G12A_MDIO_EXTERNAL_ID 0
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#define MESON_G12A_MDIO_INTERNAL_ID 1
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struct g12a_mdio_mux {
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bool pll_is_enabled;
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void __iomem *regs;
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void *mux_handle;
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struct clk *pclk;
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struct clk *pll;
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};
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struct g12a_ephy_pll {
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void __iomem *base;
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struct clk_hw hw;
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};
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#define g12a_ephy_pll_to_dev(_hw) \
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container_of(_hw, struct g12a_ephy_pll, hw)
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static unsigned long g12a_ephy_pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
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u32 val, m, n;
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val = readl(pll->base + ETH_PLL_CTL0);
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m = FIELD_GET(PLL_CTL0_M, val);
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n = FIELD_GET(PLL_CTL0_N, val);
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return parent_rate * m / n;
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}
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static int g12a_ephy_pll_enable(struct clk_hw *hw)
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{
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struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
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u32 val = readl(pll->base + ETH_PLL_CTL0);
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/* Apply both enable an reset */
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val |= PLL_CTL0_RST | PLL_CTL0_EN;
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writel(val, pll->base + ETH_PLL_CTL0);
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/* Clear the reset to let PLL lock */
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val &= ~PLL_CTL0_RST;
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writel(val, pll->base + ETH_PLL_CTL0);
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/* Poll on the digital lock instead of the usual analog lock
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* This is done because bit 31 is unreliable on some SoC. Bit
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* 31 may indicate that the PLL is not lock eventhough the clock
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* is actually running
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*/
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return readl_poll_timeout(pll->base + ETH_PLL_CTL0, val,
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val & PLL_CTL0_LOCK_DIG, 0, PLL_LOCK_TIMEOUT);
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}
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static void g12a_ephy_pll_disable(struct clk_hw *hw)
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{
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struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
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u32 val;
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val = readl(pll->base + ETH_PLL_CTL0);
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val &= ~PLL_CTL0_EN;
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val |= PLL_CTL0_RST;
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writel(val, pll->base + ETH_PLL_CTL0);
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}
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static int g12a_ephy_pll_is_enabled(struct clk_hw *hw)
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{
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struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
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unsigned int val;
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val = readl(pll->base + ETH_PLL_CTL0);
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return (val & PLL_CTL0_LOCK_DIG) ? 1 : 0;
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}
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static int g12a_ephy_pll_init(struct clk_hw *hw)
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{
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struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
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/* Apply PLL HW settings */
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writel(0x29c0040a, pll->base + ETH_PLL_CTL0);
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writel(0x927e0000, pll->base + ETH_PLL_CTL1);
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writel(0xac5f49e5, pll->base + ETH_PLL_CTL2);
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writel(0x00000000, pll->base + ETH_PLL_CTL3);
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writel(0x00000000, pll->base + ETH_PLL_CTL4);
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writel(0x20200000, pll->base + ETH_PLL_CTL5);
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writel(0x0000c002, pll->base + ETH_PLL_CTL6);
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writel(0x00000023, pll->base + ETH_PLL_CTL7);
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return 0;
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}
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static const struct clk_ops g12a_ephy_pll_ops = {
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.recalc_rate = g12a_ephy_pll_recalc_rate,
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.is_enabled = g12a_ephy_pll_is_enabled,
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.enable = g12a_ephy_pll_enable,
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.disable = g12a_ephy_pll_disable,
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.init = g12a_ephy_pll_init,
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};
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static int g12a_enable_internal_mdio(struct g12a_mdio_mux *priv)
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{
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int ret;
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/* Enable the phy clock */
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if (!priv->pll_is_enabled) {
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ret = clk_prepare_enable(priv->pll);
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if (ret)
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return ret;
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}
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priv->pll_is_enabled = true;
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/* Initialize ephy control */
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writel(EPHY_G12A_ID, priv->regs + ETH_PHY_CNTL0);
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writel(FIELD_PREP(PHY_CNTL1_ST_MODE, 3) |
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FIELD_PREP(PHY_CNTL1_ST_PHYADD, EPHY_DFLT_ADD) |
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FIELD_PREP(PHY_CNTL1_MII_MODE, EPHY_MODE_RMII) |
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PHY_CNTL1_CLK_EN |
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PHY_CNTL1_CLKFREQ |
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PHY_CNTL1_PHY_ENB,
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priv->regs + ETH_PHY_CNTL1);
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writel(PHY_CNTL2_USE_INTERNAL |
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PHY_CNTL2_SMI_SRC_MAC |
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PHY_CNTL2_RX_CLK_EPHY,
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priv->regs + ETH_PHY_CNTL2);
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return 0;
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}
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static int g12a_enable_external_mdio(struct g12a_mdio_mux *priv)
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{
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/* Reset the mdio bus mux */
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writel_relaxed(0x0, priv->regs + ETH_PHY_CNTL2);
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/* Disable the phy clock if enabled */
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if (priv->pll_is_enabled) {
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clk_disable_unprepare(priv->pll);
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priv->pll_is_enabled = false;
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}
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return 0;
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}
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static int g12a_mdio_switch_fn(int current_child, int desired_child,
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void *data)
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{
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struct g12a_mdio_mux *priv = dev_get_drvdata(data);
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if (current_child == desired_child)
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return 0;
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switch (desired_child) {
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case MESON_G12A_MDIO_EXTERNAL_ID:
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return g12a_enable_external_mdio(priv);
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case MESON_G12A_MDIO_INTERNAL_ID:
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return g12a_enable_internal_mdio(priv);
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default:
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return -EINVAL;
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}
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}
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static const struct of_device_id g12a_mdio_mux_match[] = {
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{ .compatible = "amlogic,g12a-mdio-mux", },
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{},
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};
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MODULE_DEVICE_TABLE(of, g12a_mdio_mux_match);
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static int g12a_ephy_glue_clk_register(struct device *dev)
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{
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struct g12a_mdio_mux *priv = dev_get_drvdata(dev);
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const char *parent_names[PLL_MUX_NUM_PARENT];
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struct clk_init_data init;
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struct g12a_ephy_pll *pll;
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struct clk_mux *mux;
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struct clk *clk;
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char *name;
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int i;
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/* get the mux parents */
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for (i = 0; i < PLL_MUX_NUM_PARENT; i++) {
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char in_name[8];
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snprintf(in_name, sizeof(in_name), "clkin%d", i);
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clk = devm_clk_get(dev, in_name);
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if (IS_ERR(clk)) {
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if (PTR_ERR(clk) != -EPROBE_DEFER)
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dev_err(dev, "Missing clock %s\n", in_name);
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return PTR_ERR(clk);
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}
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parent_names[i] = __clk_get_name(clk);
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}
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/* create the input mux */
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mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
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if (!mux)
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return -ENOMEM;
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name = kasprintf(GFP_KERNEL, "%s#mux", dev_name(dev));
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if (!name)
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return -ENOMEM;
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init.name = name;
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init.ops = &clk_mux_ro_ops;
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init.flags = 0;
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init.parent_names = parent_names;
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init.num_parents = PLL_MUX_NUM_PARENT;
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mux->reg = priv->regs + ETH_PLL_CTL0;
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mux->shift = __ffs(PLL_CTL0_SEL);
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mux->mask = PLL_CTL0_SEL >> mux->shift;
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mux->hw.init = &init;
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clk = devm_clk_register(dev, &mux->hw);
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kfree(name);
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if (IS_ERR(clk)) {
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dev_err(dev, "failed to register input mux\n");
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return PTR_ERR(clk);
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}
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/* create the pll */
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pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
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if (!pll)
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return -ENOMEM;
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name = kasprintf(GFP_KERNEL, "%s#pll", dev_name(dev));
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if (!name)
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return -ENOMEM;
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init.name = name;
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init.ops = &g12a_ephy_pll_ops;
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init.flags = 0;
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parent_names[0] = __clk_get_name(clk);
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init.parent_names = parent_names;
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init.num_parents = 1;
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pll->base = priv->regs;
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pll->hw.init = &init;
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clk = devm_clk_register(dev, &pll->hw);
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kfree(name);
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if (IS_ERR(clk)) {
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dev_err(dev, "failed to register input mux\n");
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return PTR_ERR(clk);
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}
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priv->pll = clk;
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return 0;
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}
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static int g12a_mdio_mux_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct g12a_mdio_mux *priv;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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priv->regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(priv->regs))
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return PTR_ERR(priv->regs);
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priv->pclk = devm_clk_get(dev, "pclk");
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if (IS_ERR(priv->pclk)) {
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ret = PTR_ERR(priv->pclk);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "failed to get peripheral clock\n");
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return ret;
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}
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/* Make sure the device registers are clocked */
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ret = clk_prepare_enable(priv->pclk);
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if (ret) {
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dev_err(dev, "failed to enable peripheral clock");
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return ret;
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}
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/* Register PLL in CCF */
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ret = g12a_ephy_glue_clk_register(dev);
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if (ret)
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goto err;
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ret = mdio_mux_init(dev, dev->of_node, g12a_mdio_switch_fn,
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&priv->mux_handle, dev, NULL);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "mdio multiplexer init failed: %d", ret);
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goto err;
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}
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return 0;
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err:
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clk_disable_unprepare(priv->pclk);
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return ret;
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}
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static int g12a_mdio_mux_remove(struct platform_device *pdev)
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{
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struct g12a_mdio_mux *priv = platform_get_drvdata(pdev);
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mdio_mux_uninit(priv->mux_handle);
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if (priv->pll_is_enabled)
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clk_disable_unprepare(priv->pll);
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clk_disable_unprepare(priv->pclk);
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return 0;
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}
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static struct platform_driver g12a_mdio_mux_driver = {
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.probe = g12a_mdio_mux_probe,
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.remove = g12a_mdio_mux_remove,
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.driver = {
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.name = "g12a-mdio_mux",
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.of_match_table = g12a_mdio_mux_match,
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},
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};
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module_platform_driver(g12a_mdio_mux_driver);
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MODULE_DESCRIPTION("Amlogic G12a MDIO multiplexer driver");
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MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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