441 lines
11 KiB
C
441 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Cortina Systems Gemini SATA bridge add-on to Faraday FTIDE010
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* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/bitops.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/delay.h>
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#include <linux/reset.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/pinctrl/consumer.h>
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#include "sata_gemini.h"
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#define DRV_NAME "gemini_sata_bridge"
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/**
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* struct sata_gemini - a state container for a Gemini SATA bridge
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* @dev: the containing device
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* @base: remapped I/O memory base
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* @muxmode: the current muxing mode
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* @ide_pins: if the device is using the plain IDE interface pins
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* @sata_bridge: if the device enables the SATA bridge
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* @sata0_reset: SATA0 reset handler
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* @sata1_reset: SATA1 reset handler
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* @sata0_pclk: SATA0 PCLK handler
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* @sata1_pclk: SATA1 PCLK handler
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*/
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struct sata_gemini {
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struct device *dev;
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void __iomem *base;
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enum gemini_muxmode muxmode;
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bool ide_pins;
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bool sata_bridge;
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struct reset_control *sata0_reset;
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struct reset_control *sata1_reset;
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struct clk *sata0_pclk;
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struct clk *sata1_pclk;
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};
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/* Miscellaneous Control Register */
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#define GEMINI_GLOBAL_MISC_CTRL 0x30
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/*
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* Values of IDE IOMUX bits in the misc control register
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*
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* Bits 26:24 are "IDE IO Select", which decides what SATA
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* adapters are connected to which of the two IDE/ATA
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* controllers in the Gemini. We can connect the two IDE blocks
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* to one SATA adapter each, both acting as master, or one IDE
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* blocks to two SATA adapters so the IDE block can act in a
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* master/slave configuration.
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*
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* We also bring out different blocks on the actual IDE
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* pins (not SATA pins) if (and only if) these are muxed in.
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*
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* 111-100 - Reserved
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* Mode 0: 000 - ata0 master <-> sata0
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* ata1 master <-> sata1
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* ata0 slave interface brought out on IDE pads
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* Mode 1: 001 - ata0 master <-> sata0
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* ata1 master <-> sata1
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* ata1 slave interface brought out on IDE pads
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* Mode 2: 010 - ata1 master <-> sata1
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* ata1 slave <-> sata0
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* ata0 master and slave interfaces brought out
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* on IDE pads
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* Mode 3: 011 - ata0 master <-> sata0
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* ata1 slave <-> sata1
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* ata1 master and slave interfaces brought out
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* on IDE pads
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*/
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#define GEMINI_IDE_IOMUX_MASK (7 << 24)
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#define GEMINI_IDE_IOMUX_MODE0 (0 << 24)
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#define GEMINI_IDE_IOMUX_MODE1 (1 << 24)
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#define GEMINI_IDE_IOMUX_MODE2 (2 << 24)
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#define GEMINI_IDE_IOMUX_MODE3 (3 << 24)
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#define GEMINI_IDE_IOMUX_SHIFT (24)
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/*
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* Registers directly controlling the PATA<->SATA adapters
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*/
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#define GEMINI_SATA_ID 0x00
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#define GEMINI_SATA_PHY_ID 0x04
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#define GEMINI_SATA0_STATUS 0x08
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#define GEMINI_SATA1_STATUS 0x0c
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#define GEMINI_SATA0_CTRL 0x18
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#define GEMINI_SATA1_CTRL 0x1c
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#define GEMINI_SATA_STATUS_BIST_DONE BIT(5)
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#define GEMINI_SATA_STATUS_BIST_OK BIT(4)
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#define GEMINI_SATA_STATUS_PHY_READY BIT(0)
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#define GEMINI_SATA_CTRL_PHY_BIST_EN BIT(14)
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#define GEMINI_SATA_CTRL_PHY_FORCE_IDLE BIT(13)
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#define GEMINI_SATA_CTRL_PHY_FORCE_READY BIT(12)
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#define GEMINI_SATA_CTRL_PHY_AFE_LOOP_EN BIT(10)
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#define GEMINI_SATA_CTRL_PHY_DIG_LOOP_EN BIT(9)
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#define GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN BIT(4)
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#define GEMINI_SATA_CTRL_ATAPI_EN BIT(3)
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#define GEMINI_SATA_CTRL_BUS_WITH_20 BIT(2)
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#define GEMINI_SATA_CTRL_SLAVE_EN BIT(1)
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#define GEMINI_SATA_CTRL_EN BIT(0)
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/*
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* There is only ever one instance of this bridge on a system,
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* so create a singleton so that the FTIDE010 instances can grab
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* a reference to it.
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*/
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static struct sata_gemini *sg_singleton;
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struct sata_gemini *gemini_sata_bridge_get(void)
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{
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if (sg_singleton)
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return sg_singleton;
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return ERR_PTR(-EPROBE_DEFER);
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}
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EXPORT_SYMBOL(gemini_sata_bridge_get);
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bool gemini_sata_bridge_enabled(struct sata_gemini *sg, bool is_ata1)
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{
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if (!sg->sata_bridge)
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return false;
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/*
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* In muxmode 2 and 3 one of the ATA controllers is
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* actually not connected to any SATA bridge.
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*/
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if ((sg->muxmode == GEMINI_MUXMODE_2) &&
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!is_ata1)
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return false;
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if ((sg->muxmode == GEMINI_MUXMODE_3) &&
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is_ata1)
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return false;
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return true;
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}
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EXPORT_SYMBOL(gemini_sata_bridge_enabled);
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enum gemini_muxmode gemini_sata_get_muxmode(struct sata_gemini *sg)
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{
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return sg->muxmode;
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}
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EXPORT_SYMBOL(gemini_sata_get_muxmode);
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static int gemini_sata_setup_bridge(struct sata_gemini *sg,
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unsigned int bridge)
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{
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unsigned long timeout = jiffies + (HZ * 1);
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bool bridge_online;
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u32 val;
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if (bridge == 0) {
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val = GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN | GEMINI_SATA_CTRL_EN;
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/* SATA0 slave mode is only used in muxmode 2 */
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if (sg->muxmode == GEMINI_MUXMODE_2)
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val |= GEMINI_SATA_CTRL_SLAVE_EN;
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writel(val, sg->base + GEMINI_SATA0_CTRL);
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} else {
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val = GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN | GEMINI_SATA_CTRL_EN;
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/* SATA1 slave mode is only used in muxmode 3 */
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if (sg->muxmode == GEMINI_MUXMODE_3)
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val |= GEMINI_SATA_CTRL_SLAVE_EN;
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writel(val, sg->base + GEMINI_SATA1_CTRL);
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}
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/* Vendor code waits 10 ms here */
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msleep(10);
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/* Wait for PHY to become ready */
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do {
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msleep(100);
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if (bridge == 0)
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val = readl(sg->base + GEMINI_SATA0_STATUS);
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else
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val = readl(sg->base + GEMINI_SATA1_STATUS);
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if (val & GEMINI_SATA_STATUS_PHY_READY)
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break;
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} while (time_before(jiffies, timeout));
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bridge_online = !!(val & GEMINI_SATA_STATUS_PHY_READY);
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dev_info(sg->dev, "SATA%d PHY %s\n", bridge,
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bridge_online ? "ready" : "not ready");
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return bridge_online ? 0: -ENODEV;
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}
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int gemini_sata_start_bridge(struct sata_gemini *sg, unsigned int bridge)
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{
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struct clk *pclk;
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int ret;
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if (bridge == 0)
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pclk = sg->sata0_pclk;
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else
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pclk = sg->sata1_pclk;
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clk_enable(pclk);
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msleep(10);
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/* Do not keep clocking a bridge that is not online */
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ret = gemini_sata_setup_bridge(sg, bridge);
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if (ret)
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clk_disable(pclk);
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return ret;
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}
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EXPORT_SYMBOL(gemini_sata_start_bridge);
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void gemini_sata_stop_bridge(struct sata_gemini *sg, unsigned int bridge)
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{
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if (bridge == 0)
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clk_disable(sg->sata0_pclk);
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else if (bridge == 1)
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clk_disable(sg->sata1_pclk);
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}
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EXPORT_SYMBOL(gemini_sata_stop_bridge);
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int gemini_sata_reset_bridge(struct sata_gemini *sg,
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unsigned int bridge)
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{
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if (bridge == 0)
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reset_control_reset(sg->sata0_reset);
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else
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reset_control_reset(sg->sata1_reset);
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msleep(10);
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return gemini_sata_setup_bridge(sg, bridge);
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}
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EXPORT_SYMBOL(gemini_sata_reset_bridge);
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static int gemini_sata_bridge_init(struct sata_gemini *sg)
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{
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struct device *dev = sg->dev;
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u32 sata_id, sata_phy_id;
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int ret;
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sg->sata0_pclk = devm_clk_get(dev, "SATA0_PCLK");
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if (IS_ERR(sg->sata0_pclk)) {
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dev_err(dev, "no SATA0 PCLK");
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return -ENODEV;
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}
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sg->sata1_pclk = devm_clk_get(dev, "SATA1_PCLK");
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if (IS_ERR(sg->sata1_pclk)) {
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dev_err(dev, "no SATA1 PCLK");
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return -ENODEV;
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}
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ret = clk_prepare_enable(sg->sata0_pclk);
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if (ret) {
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pr_err("failed to enable SATA0 PCLK\n");
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return ret;
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}
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ret = clk_prepare_enable(sg->sata1_pclk);
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if (ret) {
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pr_err("failed to enable SATA1 PCLK\n");
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clk_disable_unprepare(sg->sata0_pclk);
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return ret;
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}
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sg->sata0_reset = devm_reset_control_get_exclusive(dev, "sata0");
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if (IS_ERR(sg->sata0_reset)) {
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dev_err(dev, "no SATA0 reset controller\n");
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clk_disable_unprepare(sg->sata1_pclk);
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clk_disable_unprepare(sg->sata0_pclk);
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return PTR_ERR(sg->sata0_reset);
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}
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sg->sata1_reset = devm_reset_control_get_exclusive(dev, "sata1");
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if (IS_ERR(sg->sata1_reset)) {
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dev_err(dev, "no SATA1 reset controller\n");
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clk_disable_unprepare(sg->sata1_pclk);
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clk_disable_unprepare(sg->sata0_pclk);
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return PTR_ERR(sg->sata1_reset);
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}
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sata_id = readl(sg->base + GEMINI_SATA_ID);
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sata_phy_id = readl(sg->base + GEMINI_SATA_PHY_ID);
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sg->sata_bridge = true;
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clk_disable(sg->sata0_pclk);
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clk_disable(sg->sata1_pclk);
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dev_info(dev, "SATA ID %08x, PHY ID: %08x\n", sata_id, sata_phy_id);
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return 0;
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}
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static int gemini_setup_ide_pins(struct device *dev)
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{
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struct pinctrl *p;
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struct pinctrl_state *ide_state;
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int ret;
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p = devm_pinctrl_get(dev);
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if (IS_ERR(p))
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return PTR_ERR(p);
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ide_state = pinctrl_lookup_state(p, "ide");
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if (IS_ERR(ide_state))
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return PTR_ERR(ide_state);
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ret = pinctrl_select_state(p, ide_state);
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if (ret) {
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dev_err(dev, "could not select IDE state\n");
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return ret;
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}
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return 0;
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}
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static int gemini_sata_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct sata_gemini *sg;
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struct regmap *map;
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struct resource *res;
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enum gemini_muxmode muxmode;
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u32 gmode;
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u32 gmask;
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int ret;
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sg = devm_kzalloc(dev, sizeof(*sg), GFP_KERNEL);
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if (!sg)
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return -ENOMEM;
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sg->dev = dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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sg->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(sg->base))
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return PTR_ERR(sg->base);
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map = syscon_regmap_lookup_by_phandle(np, "syscon");
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if (IS_ERR(map)) {
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dev_err(dev, "no global syscon\n");
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return PTR_ERR(map);
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}
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/* Set up the SATA bridge if need be */
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if (of_property_read_bool(np, "cortina,gemini-enable-sata-bridge")) {
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ret = gemini_sata_bridge_init(sg);
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if (ret)
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return ret;
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}
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if (of_property_read_bool(np, "cortina,gemini-enable-ide-pins"))
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sg->ide_pins = true;
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if (!sg->sata_bridge && !sg->ide_pins) {
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dev_err(dev, "neither SATA bridge or IDE output enabled\n");
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ret = -EINVAL;
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goto out_unprep_clk;
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}
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ret = of_property_read_u32(np, "cortina,gemini-ata-muxmode", &muxmode);
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if (ret) {
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dev_err(dev, "could not parse ATA muxmode\n");
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goto out_unprep_clk;
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}
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if (muxmode > GEMINI_MUXMODE_3) {
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dev_err(dev, "illegal muxmode %d\n", muxmode);
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ret = -EINVAL;
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goto out_unprep_clk;
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}
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sg->muxmode = muxmode;
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gmask = GEMINI_IDE_IOMUX_MASK;
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gmode = (muxmode << GEMINI_IDE_IOMUX_SHIFT);
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ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, gmask, gmode);
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if (ret) {
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dev_err(dev, "unable to set up IDE muxing\n");
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ret = -ENODEV;
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goto out_unprep_clk;
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}
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/*
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* Route out the IDE pins if desired.
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* This is done by looking up a special pin control state called
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* "ide" that will route out the IDE pins.
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*/
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if (sg->ide_pins) {
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ret = gemini_setup_ide_pins(dev);
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if (ret)
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return ret;
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}
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dev_info(dev, "set up the Gemini IDE/SATA nexus\n");
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platform_set_drvdata(pdev, sg);
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sg_singleton = sg;
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return 0;
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out_unprep_clk:
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if (sg->sata_bridge) {
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clk_unprepare(sg->sata1_pclk);
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clk_unprepare(sg->sata0_pclk);
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}
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return ret;
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}
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static int gemini_sata_remove(struct platform_device *pdev)
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{
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struct sata_gemini *sg = platform_get_drvdata(pdev);
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if (sg->sata_bridge) {
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clk_unprepare(sg->sata1_pclk);
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clk_unprepare(sg->sata0_pclk);
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}
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sg_singleton = NULL;
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return 0;
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}
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static const struct of_device_id gemini_sata_of_match[] = {
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{
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.compatible = "cortina,gemini-sata-bridge",
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},
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{},
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};
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static struct platform_driver gemini_sata_driver = {
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.driver = {
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.name = DRV_NAME,
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.of_match_table = of_match_ptr(gemini_sata_of_match),
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},
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.probe = gemini_sata_probe,
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.remove = gemini_sata_remove,
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};
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module_platform_driver(gemini_sata_driver);
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MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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