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linux/drivers/ata/sata_gemini.c
Linus Walleij d872ced29d ata: sata_gemini: Introduce explicit IDE pin control 
The IDE pins are managed by the pin controller, if we want to
use these, we need to ask the pin controller to explicitly enable
them as by default, these pins are used for other business and
most users just rely on the SATA bridge.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
2017-08-11 10:32:09 -07:00

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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 <linux/pinctrl/consumer.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;
};
/* 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)
/*
* 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_exclusive(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_exclusive(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_setup_ide_pins(struct device *dev)
{
struct pinctrl *p;
struct pinctrl_state *ide_state;
int ret;
p = devm_pinctrl_get(dev);
if (IS_ERR(p))
return PTR_ERR(p);
ide_state = pinctrl_lookup_state(p, "ide");
if (IS_ERR(ide_state))
return PTR_ERR(ide_state);
ret = pinctrl_select_state(p, ide_state);
if (ret) {
dev_err(dev, "could not select IDE state\n");
return ret;
}
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;
struct regmap *map;
struct resource *res;
enum gemini_muxmode muxmode;
u32 gmode;
u32 gmask;
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);
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;
}
/*
* Route out the IDE pins if desired.
* This is done by looking up a special pin control state called
* "ide" that will route out the IDE pins.
*/
if (sg->ide_pins) {
ret = gemini_setup_ide_pins(dev);
if (ret)
return ret;
}
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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