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USB: OTG: msm: Configure PHY Analog and Digital voltage domains
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Signed-off-by: Anji jonnala <anjir@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Anji jonnala authored and Greg Kroah-Hartman committed May 7, 2011
1 parent d860852 commit 11aa5c4
Showing 1 changed file with 189 additions and 0 deletions.
189 changes: 189 additions & 0 deletions drivers/usb/otg/msm_otg.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,13 +38,179 @@
#include <linux/usb/hcd.h>
#include <linux/usb/msm_hsusb.h>
#include <linux/usb/msm_hsusb_hw.h>
#include <linux/regulator/consumer.h>

#include <mach/clk.h>

#define MSM_USB_BASE (motg->regs)
#define DRIVER_NAME "msm_otg"

#define ULPI_IO_TIMEOUT_USEC (10 * 1000)

#define USB_PHY_3P3_VOL_MIN 3050000 /* uV */
#define USB_PHY_3P3_VOL_MAX 3300000 /* uV */
#define USB_PHY_3P3_HPM_LOAD 50000 /* uA */
#define USB_PHY_3P3_LPM_LOAD 4000 /* uA */

#define USB_PHY_1P8_VOL_MIN 1800000 /* uV */
#define USB_PHY_1P8_VOL_MAX 1800000 /* uV */
#define USB_PHY_1P8_HPM_LOAD 50000 /* uA */
#define USB_PHY_1P8_LPM_LOAD 4000 /* uA */

#define USB_PHY_VDD_DIG_VOL_MIN 1000000 /* uV */
#define USB_PHY_VDD_DIG_VOL_MAX 1320000 /* uV */

static struct regulator *hsusb_3p3;
static struct regulator *hsusb_1p8;
static struct regulator *hsusb_vddcx;

static int msm_hsusb_init_vddcx(struct msm_otg *motg, int init)
{
int ret = 0;

if (init) {
hsusb_vddcx = regulator_get(motg->otg.dev, "HSUSB_VDDCX");
if (IS_ERR(hsusb_vddcx)) {
dev_err(motg->otg.dev, "unable to get hsusb vddcx\n");
return PTR_ERR(hsusb_vddcx);
}

ret = regulator_set_voltage(hsusb_vddcx,
USB_PHY_VDD_DIG_VOL_MIN,
USB_PHY_VDD_DIG_VOL_MAX);
if (ret) {
dev_err(motg->otg.dev, "unable to set the voltage "
"for hsusb vddcx\n");
regulator_put(hsusb_vddcx);
return ret;
}

ret = regulator_enable(hsusb_vddcx);
if (ret) {
dev_err(motg->otg.dev, "unable to enable hsusb vddcx\n");
regulator_put(hsusb_vddcx);
}
} else {
ret = regulator_set_voltage(hsusb_vddcx, 0,
USB_PHY_VDD_DIG_VOL_MIN);
if (ret) {
dev_err(motg->otg.dev, "unable to set the voltage "
"for hsusb vddcx\n");
return ret;
}
ret = regulator_disable(hsusb_vddcx);
if (ret)
dev_err(motg->otg.dev, "unable to disable hsusb vddcx\n");

regulator_put(hsusb_vddcx);
}

return ret;
}

static int msm_hsusb_ldo_init(struct msm_otg *motg, int init)
{
int rc = 0;

if (init) {
hsusb_3p3 = regulator_get(motg->otg.dev, "HSUSB_3p3");
if (IS_ERR(hsusb_3p3)) {
dev_err(motg->otg.dev, "unable to get hsusb 3p3\n");
return PTR_ERR(hsusb_3p3);
}

rc = regulator_set_voltage(hsusb_3p3, USB_PHY_3P3_VOL_MIN,
USB_PHY_3P3_VOL_MAX);
if (rc) {
dev_err(motg->otg.dev, "unable to set voltage level "
"for hsusb 3p3\n");
goto put_3p3;
}
rc = regulator_enable(hsusb_3p3);
if (rc) {
dev_err(motg->otg.dev, "unable to enable the hsusb 3p3\n");
goto put_3p3;
}
hsusb_1p8 = regulator_get(motg->otg.dev, "HSUSB_1p8");
if (IS_ERR(hsusb_1p8)) {
dev_err(motg->otg.dev, "unable to get hsusb 1p8\n");
rc = PTR_ERR(hsusb_1p8);
goto disable_3p3;
}
rc = regulator_set_voltage(hsusb_1p8, USB_PHY_1P8_VOL_MIN,
USB_PHY_1P8_VOL_MAX);
if (rc) {
dev_err(motg->otg.dev, "unable to set voltage level "
"for hsusb 1p8\n");
goto put_1p8;
}
rc = regulator_enable(hsusb_1p8);
if (rc) {
dev_err(motg->otg.dev, "unable to enable the hsusb 1p8\n");
goto put_1p8;
}

return 0;
}

regulator_disable(hsusb_1p8);
put_1p8:
regulator_put(hsusb_1p8);
disable_3p3:
regulator_disable(hsusb_3p3);
put_3p3:
regulator_put(hsusb_3p3);
return rc;
}

static int msm_hsusb_ldo_set_mode(int on)
{
int ret = 0;

if (!hsusb_1p8 || IS_ERR(hsusb_1p8)) {
pr_err("%s: HSUSB_1p8 is not initialized\n", __func__);
return -ENODEV;
}

if (!hsusb_3p3 || IS_ERR(hsusb_3p3)) {
pr_err("%s: HSUSB_3p3 is not initialized\n", __func__);
return -ENODEV;
}

if (on) {
ret = regulator_set_optimum_mode(hsusb_1p8,
USB_PHY_1P8_HPM_LOAD);
if (ret < 0) {
pr_err("%s: Unable to set HPM of the regulator "
"HSUSB_1p8\n", __func__);
return ret;
}
ret = regulator_set_optimum_mode(hsusb_3p3,
USB_PHY_3P3_HPM_LOAD);
if (ret < 0) {
pr_err("%s: Unable to set HPM of the regulator "
"HSUSB_3p3\n", __func__);
regulator_set_optimum_mode(hsusb_1p8,
USB_PHY_1P8_LPM_LOAD);
return ret;
}
} else {
ret = regulator_set_optimum_mode(hsusb_1p8,
USB_PHY_1P8_LPM_LOAD);
if (ret < 0)
pr_err("%s: Unable to set LPM of the regulator "
"HSUSB_1p8\n", __func__);
ret = regulator_set_optimum_mode(hsusb_3p3,
USB_PHY_3P3_LPM_LOAD);
if (ret < 0)
pr_err("%s: Unable to set LPM of the regulator "
"HSUSB_3p3\n", __func__);
}

pr_debug("reg (%s)\n", on ? "HPM" : "LPM");
return ret < 0 ? ret : 0;
}

static int ulpi_read(struct otg_transceiver *otg, u32 reg)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
Expand Down Expand Up @@ -1297,6 +1463,24 @@ static int __init msm_otg_probe(struct platform_device *pdev)

clk_enable(motg->clk);
clk_enable(motg->pclk);

ret = msm_hsusb_init_vddcx(motg, 1);
if (ret) {
dev_err(&pdev->dev, "hsusb vddcx configuration failed\n");
goto free_regs;
}

ret = msm_hsusb_ldo_init(motg, 1);
if (ret) {
dev_err(&pdev->dev, "hsusb vreg configuration failed\n");
goto vddcx_exit;
}
ret = msm_hsusb_ldo_set_mode(1);
if (ret) {
dev_err(&pdev->dev, "hsusb vreg enable failed\n");
goto ldo_exit;
}

if (motg->core_clk)
clk_enable(motg->core_clk);

Expand Down Expand Up @@ -1345,6 +1529,10 @@ static int __init msm_otg_probe(struct platform_device *pdev)
disable_clks:
clk_disable(motg->pclk);
clk_disable(motg->clk);
ldo_exit:
msm_hsusb_ldo_init(motg, 0);
vddcx_exit:
msm_hsusb_init_vddcx(motg, 0);
free_regs:
iounmap(motg->regs);
put_core_clk:
Expand Down Expand Up @@ -1410,6 +1598,7 @@ static int __devexit msm_otg_remove(struct platform_device *pdev)
clk_disable(motg->pclk_src);
clk_put(motg->pclk_src);
}
msm_hsusb_ldo_init(motg, 0);

iounmap(motg->regs);
pm_runtime_set_suspended(&pdev->dev);
Expand Down

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