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linux-sg2042/drivers/ata/sata_gemini.c

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/*
* Cortina Systems Gemini SATA bridge add-on to Faraday FTIDE010
* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/delay.h>
#include <linux/reset.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include "sata_gemini.h"
#define DRV_NAME "gemini_sata_bridge"
/**
* struct sata_gemini - a state container for a Gemini SATA bridge
* @dev: the containing device
* @base: remapped I/O memory base
* @muxmode: the current muxing mode
* @ide_pins: if the device is using the plain IDE interface pins
* @sata_bridge: if the device enables the SATA bridge
* @sata0_reset: SATA0 reset handler
* @sata1_reset: SATA1 reset handler
* @sata0_pclk: SATA0 PCLK handler
* @sata1_pclk: SATA1 PCLK handler
*/
struct sata_gemini {
struct device *dev;
void __iomem *base;
enum gemini_muxmode muxmode;
bool ide_pins;
bool sata_bridge;
struct reset_control *sata0_reset;
struct reset_control *sata1_reset;
struct clk *sata0_pclk;
struct clk *sata1_pclk;
};
/* Global IDE PAD Skew Control Register */
#define GEMINI_GLOBAL_IDE_SKEW_CTRL 0x18
#define GEMINI_IDE1_HOST_STROBE_DELAY_SHIFT 28
#define GEMINI_IDE1_DEVICE_STROBE_DELAY_SHIFT 24
#define GEMINI_IDE1_OUTPUT_IO_SKEW_SHIFT 20
#define GEMINI_IDE1_INPUT_IO_SKEW_SHIFT 16
#define GEMINI_IDE0_HOST_STROBE_DELAY_SHIFT 12
#define GEMINI_IDE0_DEVICE_STROBE_DELAY_SHIFT 8
#define GEMINI_IDE0_OUTPUT_IO_SKEW_SHIFT 4
#define GEMINI_IDE0_INPUT_IO_SKEW_SHIFT 0
/* Miscellaneous Control Register */
#define GEMINI_GLOBAL_MISC_CTRL 0x30
/*
* Values of IDE IOMUX bits in the misc control register
*
* Bits 26:24 are "IDE IO Select", which decides what SATA
* adapters are connected to which of the two IDE/ATA
* controllers in the Gemini. We can connect the two IDE blocks
* to one SATA adapter each, both acting as master, or one IDE
* blocks to two SATA adapters so the IDE block can act in a
* master/slave configuration.
*
* We also bring out different blocks on the actual IDE
* pins (not SATA pins) if (and only if) these are muxed in.
*
* 111-100 - Reserved
* Mode 0: 000 - ata0 master <-> sata0
* ata1 master <-> sata1
* ata0 slave interface brought out on IDE pads
* Mode 1: 001 - ata0 master <-> sata0
* ata1 master <-> sata1
* ata1 slave interface brought out on IDE pads
* Mode 2: 010 - ata1 master <-> sata1
* ata1 slave <-> sata0
* ata0 master and slave interfaces brought out
* on IDE pads
* Mode 3: 011 - ata0 master <-> sata0
* ata1 slave <-> sata1
* ata1 master and slave interfaces brought out
* on IDE pads
*/
#define GEMINI_IDE_IOMUX_MASK (7 << 24)
#define GEMINI_IDE_IOMUX_MODE0 (0 << 24)
#define GEMINI_IDE_IOMUX_MODE1 (1 << 24)
#define GEMINI_IDE_IOMUX_MODE2 (2 << 24)
#define GEMINI_IDE_IOMUX_MODE3 (3 << 24)
#define GEMINI_IDE_IOMUX_SHIFT (24)
#define GEMINI_IDE_PADS_ENABLE BIT(4)
#define GEMINI_PFLASH_PADS_DISABLE BIT(1)
/*
* Registers directly controlling the PATA<->SATA adapters
*/
#define GEMINI_SATA_ID 0x00
#define GEMINI_SATA_PHY_ID 0x04
#define GEMINI_SATA0_STATUS 0x08
#define GEMINI_SATA1_STATUS 0x0c
#define GEMINI_SATA0_CTRL 0x18
#define GEMINI_SATA1_CTRL 0x1c
#define GEMINI_SATA_STATUS_BIST_DONE BIT(5)
#define GEMINI_SATA_STATUS_BIST_OK BIT(4)
#define GEMINI_SATA_STATUS_PHY_READY BIT(0)
#define GEMINI_SATA_CTRL_PHY_BIST_EN BIT(14)
#define GEMINI_SATA_CTRL_PHY_FORCE_IDLE BIT(13)
#define GEMINI_SATA_CTRL_PHY_FORCE_READY BIT(12)
#define GEMINI_SATA_CTRL_PHY_AFE_LOOP_EN BIT(10)
#define GEMINI_SATA_CTRL_PHY_DIG_LOOP_EN BIT(9)
#define GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN BIT(4)
#define GEMINI_SATA_CTRL_ATAPI_EN BIT(3)
#define GEMINI_SATA_CTRL_BUS_WITH_20 BIT(2)
#define GEMINI_SATA_CTRL_SLAVE_EN BIT(1)
#define GEMINI_SATA_CTRL_EN BIT(0)
/*
* There is only ever one instance of this bridge on a system,
* so create a singleton so that the FTIDE010 instances can grab
* a reference to it.
*/
static struct sata_gemini *sg_singleton;
struct sata_gemini *gemini_sata_bridge_get(void)
{
if (sg_singleton)
return sg_singleton;
return ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL(gemini_sata_bridge_get);
bool gemini_sata_bridge_enabled(struct sata_gemini *sg, bool is_ata1)
{
if (!sg->sata_bridge)
return false;
/*
* In muxmode 2 and 3 one of the ATA controllers is
* actually not connected to any SATA bridge.
*/
if ((sg->muxmode == GEMINI_MUXMODE_2) &&
!is_ata1)
return false;
if ((sg->muxmode == GEMINI_MUXMODE_3) &&
is_ata1)
return false;
return true;
}
EXPORT_SYMBOL(gemini_sata_bridge_enabled);
enum gemini_muxmode gemini_sata_get_muxmode(struct sata_gemini *sg)
{
return sg->muxmode;
}
EXPORT_SYMBOL(gemini_sata_get_muxmode);
static int gemini_sata_setup_bridge(struct sata_gemini *sg,
unsigned int bridge)
{
unsigned long timeout = jiffies + (HZ * 1);
bool bridge_online;
u32 val;
if (bridge == 0) {
val = GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN | GEMINI_SATA_CTRL_EN;
/* SATA0 slave mode is only used in muxmode 2 */
if (sg->muxmode == GEMINI_MUXMODE_2)
val |= GEMINI_SATA_CTRL_SLAVE_EN;
writel(val, sg->base + GEMINI_SATA0_CTRL);
} else {
val = GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN | GEMINI_SATA_CTRL_EN;
/* SATA1 slave mode is only used in muxmode 3 */
if (sg->muxmode == GEMINI_MUXMODE_3)
val |= GEMINI_SATA_CTRL_SLAVE_EN;
writel(val, sg->base + GEMINI_SATA1_CTRL);
}
/* Vendor code waits 10 ms here */
msleep(10);
/* Wait for PHY to become ready */
do {
msleep(100);
if (bridge == 0)
val = readl(sg->base + GEMINI_SATA0_STATUS);
else
val = readl(sg->base + GEMINI_SATA1_STATUS);
if (val & GEMINI_SATA_STATUS_PHY_READY)
break;
} while (time_before(jiffies, timeout));
bridge_online = !!(val & GEMINI_SATA_STATUS_PHY_READY);
dev_info(sg->dev, "SATA%d PHY %s\n", bridge,
bridge_online ? "ready" : "not ready");
return bridge_online ? 0: -ENODEV;
}
int gemini_sata_start_bridge(struct sata_gemini *sg, unsigned int bridge)
{
struct clk *pclk;
int ret;
if (bridge == 0)
pclk = sg->sata0_pclk;
else
pclk = sg->sata1_pclk;
clk_enable(pclk);
msleep(10);
/* Do not keep clocking a bridge that is not online */
ret = gemini_sata_setup_bridge(sg, bridge);
if (ret)
clk_disable(pclk);
return ret;
}
EXPORT_SYMBOL(gemini_sata_start_bridge);
void gemini_sata_stop_bridge(struct sata_gemini *sg, unsigned int bridge)
{
if (bridge == 0)
clk_disable(sg->sata0_pclk);
else if (bridge == 1)
clk_disable(sg->sata1_pclk);
}
EXPORT_SYMBOL(gemini_sata_stop_bridge);
int gemini_sata_reset_bridge(struct sata_gemini *sg,
unsigned int bridge)
{
if (bridge == 0)
reset_control_reset(sg->sata0_reset);
else
reset_control_reset(sg->sata1_reset);
msleep(10);
return gemini_sata_setup_bridge(sg, bridge);
}
EXPORT_SYMBOL(gemini_sata_reset_bridge);
static int gemini_sata_bridge_init(struct sata_gemini *sg)
{
struct device *dev = sg->dev;
u32 sata_id, sata_phy_id;
int ret;
sg->sata0_pclk = devm_clk_get(dev, "SATA0_PCLK");
if (IS_ERR(sg->sata0_pclk)) {
dev_err(dev, "no SATA0 PCLK");
return -ENODEV;
}
sg->sata1_pclk = devm_clk_get(dev, "SATA1_PCLK");
if (IS_ERR(sg->sata1_pclk)) {
dev_err(dev, "no SATA1 PCLK");
return -ENODEV;
}
ret = clk_prepare_enable(sg->sata0_pclk);
if (ret) {
pr_err("failed to enable SATA0 PCLK\n");
return ret;
}
ret = clk_prepare_enable(sg->sata1_pclk);
if (ret) {
pr_err("failed to enable SATA1 PCLK\n");
clk_disable_unprepare(sg->sata0_pclk);
return ret;
}
sg->sata0_reset = devm_reset_control_get(dev, "sata0");
if (IS_ERR(sg->sata0_reset)) {
dev_err(dev, "no SATA0 reset controller\n");
clk_disable_unprepare(sg->sata1_pclk);
clk_disable_unprepare(sg->sata0_pclk);
return PTR_ERR(sg->sata0_reset);
}
sg->sata1_reset = devm_reset_control_get(dev, "sata1");
if (IS_ERR(sg->sata1_reset)) {
dev_err(dev, "no SATA1 reset controller\n");
clk_disable_unprepare(sg->sata1_pclk);
clk_disable_unprepare(sg->sata0_pclk);
return PTR_ERR(sg->sata1_reset);
}
sata_id = readl(sg->base + GEMINI_SATA_ID);
sata_phy_id = readl(sg->base + GEMINI_SATA_PHY_ID);
sg->sata_bridge = true;
clk_disable(sg->sata0_pclk);
clk_disable(sg->sata1_pclk);
dev_info(dev, "SATA ID %08x, PHY ID: %08x\n", sata_id, sata_phy_id);
return 0;
}
static int gemini_sata_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct sata_gemini *sg;
static struct regmap *map;
struct resource *res;
enum gemini_muxmode muxmode;
u32 gmode;
u32 gmask;
u32 val;
int ret;
sg = devm_kzalloc(dev, sizeof(*sg), GFP_KERNEL);
if (!sg)
return -ENOMEM;
sg->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
sg->base = devm_ioremap_resource(dev, res);
if (IS_ERR(sg->base))
return PTR_ERR(sg->base);
map = syscon_regmap_lookup_by_phandle(np, "syscon");
if (IS_ERR(map)) {
dev_err(dev, "no global syscon\n");
return PTR_ERR(map);
}
/* Set up the SATA bridge if need be */
if (of_property_read_bool(np, "cortina,gemini-enable-sata-bridge")) {
ret = gemini_sata_bridge_init(sg);
if (ret)
return ret;
}
if (of_property_read_bool(np, "cortina,gemini-enable-ide-pins"))
sg->ide_pins = true;
if (!sg->sata_bridge && !sg->ide_pins) {
dev_err(dev, "neither SATA bridge or IDE output enabled\n");
ret = -EINVAL;
goto out_unprep_clk;
}
ret = of_property_read_u32(np, "cortina,gemini-ata-muxmode", &muxmode);
if (ret) {
dev_err(dev, "could not parse ATA muxmode\n");
goto out_unprep_clk;
}
if (muxmode > GEMINI_MUXMODE_3) {
dev_err(dev, "illegal muxmode %d\n", muxmode);
ret = -EINVAL;
goto out_unprep_clk;
}
sg->muxmode = muxmode;
gmask = GEMINI_IDE_IOMUX_MASK;
gmode = (muxmode << GEMINI_IDE_IOMUX_SHIFT);
/*
* If we mux out the IDE, parallel flash must be disabled.
* SATA0 and SATA1 have dedicated pins and may coexist with
* parallel flash.
*/
if (sg->ide_pins)
gmode |= GEMINI_IDE_PADS_ENABLE | GEMINI_PFLASH_PADS_DISABLE;
else
gmask |= GEMINI_IDE_PADS_ENABLE;
ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, gmask, gmode);
if (ret) {
dev_err(dev, "unable to set up IDE muxing\n");
ret = -ENODEV;
goto out_unprep_clk;
}
/* FIXME: add more elaborate IDE skew control handling */
if (sg->ide_pins) {
ret = regmap_read(map, GEMINI_GLOBAL_IDE_SKEW_CTRL, &val);
if (ret) {
dev_err(dev, "cannot read IDE skew control register\n");
return ret;
}
dev_info(dev, "IDE skew control: %08x\n", val);
}
dev_info(dev, "set up the Gemini IDE/SATA nexus\n");
platform_set_drvdata(pdev, sg);
sg_singleton = sg;
return 0;
out_unprep_clk:
if (sg->sata_bridge) {
clk_unprepare(sg->sata1_pclk);
clk_unprepare(sg->sata0_pclk);
}
return ret;
}
static int gemini_sata_remove(struct platform_device *pdev)
{
struct sata_gemini *sg = platform_get_drvdata(pdev);
if (sg->sata_bridge) {
clk_unprepare(sg->sata1_pclk);
clk_unprepare(sg->sata0_pclk);
}
sg_singleton = NULL;
return 0;
}
static const struct of_device_id gemini_sata_of_match[] = {
{
.compatible = "cortina,gemini-sata-bridge",
},
{},
};
static struct platform_driver gemini_sata_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(gemini_sata_of_match),
},
.probe = gemini_sata_probe,
.remove = gemini_sata_remove,
};
module_platform_driver(gemini_sata_driver);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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