// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Universal Flash Storage Host controller Platform bus based glue driver
* Copyright ( C ) 2011 - 2013 Samsung India Software Operations
*
* Authors :
* Santosh Yaraganavi < santosh . sy @ samsung . com >
* Vinayak Holikatti < h . vinayak @ samsung . com >
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <ufs/ufshcd.h>
#include "ufshcd-pltfrm.h"
#include <ufs/unipro.h>
#define UFSHCD_DEFAULT_LANES_PER_DIRECTION 2
static int ufshcd_parse_clock_info(struct ufs_hba *hba)
{
int ret = 0 ;
int cnt;
int i;
struct device *dev = hba->dev;
struct device_node *np = dev->of_node;
const char *name;
u32 *clkfreq = NULL;
struct ufs_clk_info *clki;
ssize_t sz = 0 ;
if (!np)
goto out;
cnt = of_property_count_strings(np, "clock-names" );
if (!cnt || (cnt == -EINVAL)) {
dev_info(dev, "%s: Unable to find clocks, assuming enabled\n" ,
__func__);
} else if (cnt < 0 ) {
dev_err(dev, "%s: count clock strings failed, err %d\n" ,
__func__, cnt);
ret = cnt;
}
if (cnt <= 0 )
goto out;
sz = of_property_count_u32_elems(np, "freq-table-hz" );
if (sz <= 0 ) {
dev_info(dev, "freq-table-hz property not specified\n" );
goto out;
}
if (sz != 2 * cnt) {
dev_err(dev, "%s len mismatch\n" , "freq-table-hz" );
ret = -EINVAL;
goto out;
}
clkfreq = devm_kcalloc(dev, sz, sizeof (*clkfreq),
GFP_KERNEL);
if (!clkfreq) {
ret = -ENOMEM;
goto out;
}
ret = of_property_read_u32_array(np, "freq-table-hz" ,
clkfreq, sz);
if (ret && (ret != -EINVAL)) {
dev_err(dev, "%s: error reading array %d\n" ,
"freq-table-hz" , ret);
return ret;
}
for (i = 0 ; i < sz; i += 2 ) {
ret = of_property_read_string_index(np, "clock-names" , i/2 ,
&name);
if (ret)
goto out;
clki = devm_kzalloc(dev, sizeof (*clki), GFP_KERNEL);
if (!clki) {
ret = -ENOMEM;
goto out;
}
clki->min_freq = clkfreq[i];
clki->max_freq = clkfreq[i+1 ];
clki->name = devm_kstrdup(dev, name, GFP_KERNEL);
if (!clki->name) {
ret = -ENOMEM;
goto out;
}
if (!strcmp(name, "ref_clk" ))
clki->keep_link_active = true ;
dev_dbg(dev, "%s: min %u max %u name %s\n" , "freq-table-hz" ,
clki->min_freq, clki->max_freq, clki->name);
list_add_tail(&clki->list, &hba->clk_list_head);
}
out:
return ret;
}
static bool phandle_exists(const struct device_node *np,
const char *phandle_name, int index)
{
struct device_node *parse_np = of_parse_phandle(np, phandle_name, index);
if (parse_np)
of_node_put(parse_np);
return parse_np != NULL;
}
#define MAX_PROP_SIZE 32
int ufshcd_populate_vreg(struct device *dev, const char *name,
struct ufs_vreg **out_vreg, bool skip_current)
{
char prop_name[MAX_PROP_SIZE];
struct ufs_vreg *vreg = NULL;
struct device_node *np = dev->of_node;
if (!np) {
dev_err(dev, "%s: non DT initialization\n" , __func__);
goto out;
}
snprintf(prop_name, MAX_PROP_SIZE, "%s-supply" , name);
if (!phandle_exists(np, prop_name, 0 )) {
dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n" ,
__func__, prop_name);
goto out;
}
vreg = devm_kzalloc(dev, sizeof (*vreg), GFP_KERNEL);
if (!vreg)
return -ENOMEM;
vreg->name = devm_kstrdup(dev, name, GFP_KERNEL);
if (!vreg->name)
return -ENOMEM;
if (skip_current) {
vreg->max_uA = 0 ;
goto out;
}
snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp" , name);
if (of_property_read_u32(np, prop_name, &vreg->max_uA)) {
dev_info(dev, "%s: unable to find %s\n" , __func__, prop_name);
vreg->max_uA = 0 ;
}
out:
*out_vreg = vreg;
return 0 ;
}
EXPORT_SYMBOL_GPL(ufshcd_populate_vreg);
/**
* ufshcd_parse_regulator_info - get regulator info from device tree
* @ hba : per adapter instance
*
* Get regulator info from device tree for vcc , vccq , vccq2 power supplies .
* If any of the supplies are not defined it is assumed that they are always - on
* and hence return zero . If the property is defined but parsing is failed
* then return corresponding error .
*
* Return : 0 upon success ; < 0 upon failure .
*/
static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
{
int err;
struct device *dev = hba->dev;
struct ufs_vreg_info *info = &hba->vreg_info;
err = ufshcd_populate_vreg(dev, "vdd-hba" , &info->vdd_hba, true );
if (err)
goto out;
err = ufshcd_populate_vreg(dev, "vcc" , &info->vcc, false );
if (err)
goto out;
err = ufshcd_populate_vreg(dev, "vccq" , &info->vccq, false );
if (err)
goto out;
err = ufshcd_populate_vreg(dev, "vccq2" , &info->vccq2, false );
out:
return err;
}
static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba)
{
struct device *dev = hba->dev;
int ret;
ret = of_property_read_u32(dev->of_node, "lanes-per-direction" ,
&hba->lanes_per_direction);
if (ret) {
dev_dbg(hba->dev,
"%s: failed to read lanes-per-direction, ret=%d\n" ,
__func__, ret);
hba->lanes_per_direction = UFSHCD_DEFAULT_LANES_PER_DIRECTION;
}
}
/**
* ufshcd_parse_clock_min_max_freq - Parse MIN and MAX clocks freq
* @ hba : per adapter instance
*
* This function parses MIN and MAX frequencies of all clocks required
* by the host drivers .
*
* Returns 0 for success and non - zero for failure
*/
static int ufshcd_parse_clock_min_max_freq(struct ufs_hba *hba)
{
struct list_head *head = &hba->clk_list_head;
struct ufs_clk_info *clki;
struct dev_pm_opp *opp;
unsigned long freq;
u8 idx = 0 ;
list_for_each_entry(clki, head, list) {
if (!clki->name)
continue ;
clki->clk = devm_clk_get(hba->dev, clki->name);
if (IS_ERR(clki->clk))
continue ;
/* Find Max Freq */
freq = ULONG_MAX;
opp = dev_pm_opp_find_freq_floor_indexed(hba->dev, &freq, idx);
if (IS_ERR(opp)) {
dev_err(hba->dev, "Failed to find OPP for MAX frequency\n" );
return PTR_ERR(opp);
}
clki->max_freq = dev_pm_opp_get_freq_indexed(opp, idx);
dev_pm_opp_put(opp);
/* Find Min Freq */
freq = 0 ;
opp = dev_pm_opp_find_freq_ceil_indexed(hba->dev, &freq, idx);
if (IS_ERR(opp)) {
dev_err(hba->dev, "Failed to find OPP for MIN frequency\n" );
return PTR_ERR(opp);
}
clki->min_freq = dev_pm_opp_get_freq_indexed(opp, idx++);
dev_pm_opp_put(opp);
}
return 0 ;
}
static int ufshcd_parse_operating_points(struct ufs_hba *hba)
{
struct device *dev = hba->dev;
struct device_node *np = dev->of_node;
struct dev_pm_opp_config config = {};
struct ufs_clk_info *clki;
const char **clk_names;
int cnt, i, ret;
if (!of_property_present(np, "operating-points-v2" ))
return 0 ;
if (of_property_present(np, "freq-table-hz" )) {
dev_err(dev, "%s: operating-points and freq-table-hz are incompatible\n" ,
__func__);
return -EINVAL;
}
cnt = of_property_count_strings(np, "clock-names" );
if (cnt <= 0 ) {
dev_err(dev, "%s: Missing clock-names\n" , __func__);
return -ENODEV;
}
/* OPP expects clk_names to be NULL terminated */
clk_names = devm_kcalloc(dev, cnt + 1 , sizeof (*clk_names), GFP_KERNEL);
if (!clk_names)
return -ENOMEM;
/*
* We still need to get reference to all clocks as the UFS core uses
* them separately .
*/
for (i = 0 ; i < cnt; i++) {
ret = of_property_read_string_index(np, "clock-names" , i,
&clk_names[i]);
if (ret)
return ret;
clki = devm_kzalloc(dev, sizeof (*clki), GFP_KERNEL);
if (!clki)
return -ENOMEM;
clki->name = devm_kstrdup(dev, clk_names[i], GFP_KERNEL);
if (!clki->name)
return -ENOMEM;
if (!strcmp(clk_names[i], "ref_clk" ))
clki->keep_link_active = true ;
list_add_tail(&clki->list, &hba->clk_list_head);
}
config.clk_names = clk_names,
config.config_clks = ufshcd_opp_config_clks;
ret = devm_pm_opp_set_config(dev, &config);
if (ret)
return ret;
ret = devm_pm_opp_of_add_table(dev);
if (ret) {
dev_err(dev, "Failed to add OPP table: %d\n" , ret);
return ret;
}
ret = ufshcd_parse_clock_min_max_freq(hba);
if (ret)
return ret;
hba->use_pm_opp = true ;
return 0 ;
}
/**
* ufshcd_negotiate_pwr_params - find power mode settings that are supported by
* both the controller and the device
* @ host_params : pointer to host parameters
* @ dev_max : pointer to device attributes
* @ agreed_pwr : returned agreed attributes
*
* Return : 0 on success , non - zero value on failure .
*/
int ufshcd_negotiate_pwr_params(const struct ufs_host_params *host_params,
const struct ufs_pa_layer_attr *dev_max,
struct ufs_pa_layer_attr *agreed_pwr)
{
int min_host_gear;
int min_dev_gear;
bool is_dev_sup_hs = false ;
bool is_host_max_hs = false ;
if (dev_max->pwr_rx == FAST_MODE)
is_dev_sup_hs = true ;
if (host_params->desired_working_mode == UFS_HS_MODE) {
is_host_max_hs = true ;
min_host_gear = min_t(u32, host_params->hs_rx_gear,
host_params->hs_tx_gear);
} else {
min_host_gear = min_t(u32, host_params->pwm_rx_gear,
host_params->pwm_tx_gear);
}
/*
* device doesn ' t support HS but host_params - > desired_working_mode is HS ,
* thus device and host_params don ' t agree
*/
if (!is_dev_sup_hs && is_host_max_hs) {
pr_info("%s: device doesn't support HS\n" ,
__func__);
return -ENOTSUPP;
} else if (is_dev_sup_hs && is_host_max_hs) {
/*
* since device supports HS , it supports FAST_MODE .
* since host_params - > desired_working_mode is also HS
* then final decision ( FAST / FASTAUTO ) is done according
* to pltfrm_params as it is the restricting factor
*/
agreed_pwr->pwr_rx = host_params->rx_pwr_hs;
agreed_pwr->pwr_tx = agreed_pwr->pwr_rx;
} else {
/*
* here host_params - > desired_working_mode is PWM .
* it doesn ' t matter whether device supports HS or PWM ,
* in both cases host_params - > desired_working_mode will
* determine the mode
*/
agreed_pwr->pwr_rx = host_params->rx_pwr_pwm;
agreed_pwr->pwr_tx = agreed_pwr->pwr_rx;
}
/*
* we would like tx to work in the minimum number of lanes
* between device capability and vendor preferences .
* the same decision will be made for rx
*/
agreed_pwr->lane_tx = min_t(u32, dev_max->lane_tx,
host_params->tx_lanes);
agreed_pwr->lane_rx = min_t(u32, dev_max->lane_rx,
host_params->rx_lanes);
/* device maximum gear is the minimum between device rx and tx gears */
min_dev_gear = min_t(u32, dev_max->gear_rx, dev_max->gear_tx);
/*
* if both device capabilities and vendor pre - defined preferences are
* both HS or both PWM then set the minimum gear to be the chosen
* working gear .
* if one is PWM and one is HS then the one that is PWM get to decide
* what is the gear , as it is the one that also decided previously what
* pwr the device will be configured to .
*/
if ((is_dev_sup_hs && is_host_max_hs) ||
(!is_dev_sup_hs && !is_host_max_hs)) {
agreed_pwr->gear_rx =
min_t(u32, min_dev_gear, min_host_gear);
} else if (!is_dev_sup_hs) {
agreed_pwr->gear_rx = min_dev_gear;
} else {
agreed_pwr->gear_rx = min_host_gear;
}
agreed_pwr->gear_tx = agreed_pwr->gear_rx;
agreed_pwr->hs_rate = host_params->hs_rate;
return 0 ;
}
EXPORT_SYMBOL_GPL(ufshcd_negotiate_pwr_params);
void ufshcd_init_host_params(struct ufs_host_params *host_params)
{
*host_params = (struct ufs_host_params){
.tx_lanes = UFS_LANE_2,
.rx_lanes = UFS_LANE_2,
.hs_rx_gear = UFS_HS_G3,
.hs_tx_gear = UFS_HS_G3,
.pwm_rx_gear = UFS_PWM_G4,
.pwm_tx_gear = UFS_PWM_G4,
.rx_pwr_pwm = SLOW_MODE,
.tx_pwr_pwm = SLOW_MODE,
.rx_pwr_hs = FAST_MODE,
.tx_pwr_hs = FAST_MODE,
.hs_rate = PA_HS_MODE_B,
.desired_working_mode = UFS_HS_MODE,
};
}
EXPORT_SYMBOL_GPL(ufshcd_init_host_params);
/**
* ufshcd_pltfrm_init - probe routine of the driver
* @ pdev : pointer to Platform device handle
* @ vops : pointer to variant ops
*
* Return : 0 on success , non - zero value on failure .
*/
int ufshcd_pltfrm_init(struct platform_device *pdev,
const struct ufs_hba_variant_ops *vops)
{
struct ufs_hba *hba;
void __iomem *mmio_base;
int irq, err;
struct device *dev = &pdev->dev;
mmio_base = devm_platform_ioremap_resource(pdev, 0 );
if (IS_ERR(mmio_base))
return PTR_ERR(mmio_base);
irq = platform_get_irq(pdev, 0 );
if (irq < 0 )
return irq;
err = ufshcd_alloc_host(dev, &hba);
if (err) {
dev_err(dev, "Allocation failed\n" );
return err;
}
hba->vops = vops;
err = ufshcd_parse_clock_info(hba);
if (err) {
dev_err(dev, "%s: clock parse failed %d\n" ,
__func__, err);
return err;
}
err = ufshcd_parse_regulator_info(hba);
if (err) {
dev_err(dev, "%s: regulator init failed %d\n" ,
__func__, err);
return err;
}
ufshcd_init_lanes_per_dir(hba);
err = ufshcd_parse_operating_points(hba);
if (err) {
dev_err(dev, "%s: OPP parse failed %d\n" , __func__, err);
return err;
}
err = ufshcd_init(hba, mmio_base, irq);
if (err) {
dev_err_probe(dev, err, "Initialization failed with error %d\n" ,
err);
return err;
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0 ;
}
EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init);
/**
* ufshcd_pltfrm_remove - Remove ufshcd platform
* @ pdev : pointer to Platform device handle
*/
void ufshcd_pltfrm_remove(struct platform_device *pdev)
{
struct ufs_hba *hba = platform_get_drvdata(pdev);
pm_runtime_get_sync(&pdev->dev);
ufshcd_remove(hba);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
}
EXPORT_SYMBOL_GPL(ufshcd_pltfrm_remove);
MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>" );
MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>" );
MODULE_DESCRIPTION("UFS host controller Platform bus based glue driver" );
MODULE_LICENSE("GPL" );
Messung V0.5 in Prozent C=97 H=97 G=96
¤ Dauer der Verarbeitung: 0.18 Sekunden
(vorverarbeitet am 2026-09-28)
¤
*© Formatika GbR, Deutschland