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pinctrl: uniphier: support 3-bit drive strength control 

The new ARMv8 SoC, PH1-LD20, supports more fine-grained drive
strength control.  Drive strength of some pins are controlled by
3-bit width registers (8-level granularity).

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Masahiro Yamada 2016-05-31 17:05:14 +09:00 committed by Linus Walleij
parent 9eaa98a63c
commit 72e5706aa7
2 changed files with 21 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
View File

@ -94,6 +94,9 @@ static void uniphier_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
case UNIPHIER_PIN_DRV_2BIT:
drv_type = "8/12/16/20(mA)";
break;
case UNIPHIER_PIN_DRV_3BIT:
drv_type = "4/5/7/9/11/12/14/16(mA)";
break;
case UNIPHIER_PIN_DRV_FIXED4:
drv_type = "4(mA)";
break;
@ -184,6 +187,7 @@ static int uniphier_conf_pin_drive_get(struct pinctrl_dev *pctldev,
uniphier_pin_get_drv_type(pin->drv_data);
const unsigned int strength_1bit[] = {4, 8};
const unsigned int strength_2bit[] = {8, 12, 16, 20};
const unsigned int strength_3bit[] = {4, 5, 7, 9, 11, 12, 14, 16};
const unsigned int *supported_strength;
unsigned int drvctrl, reg, shift, mask, width, val;
int ret;
@ -191,12 +195,19 @@ static int uniphier_conf_pin_drive_get(struct pinctrl_dev *pctldev,
switch (type) {
case UNIPHIER_PIN_DRV_1BIT:
supported_strength = strength_1bit;
reg = UNIPHIER_PINCTRL_DRVCTRL_BASE;
width = 1;
break;
case UNIPHIER_PIN_DRV_2BIT:
supported_strength = strength_2bit;
reg = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
width = 2;
break;
case UNIPHIER_PIN_DRV_3BIT:
supported_strength = strength_3bit;
reg = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
width = 4;
break;
case UNIPHIER_PIN_DRV_FIXED4:
*strength = 4;
return 0;
@ -214,9 +225,6 @@ static int uniphier_conf_pin_drive_get(struct pinctrl_dev *pctldev,
drvctrl = uniphier_pin_get_drvctrl(pin->drv_data);
drvctrl *= width;
reg = (width == 2) ? UNIPHIER_PINCTRL_DRV2CTRL_BASE :
UNIPHIER_PINCTRL_DRVCTRL_BASE;
reg += drvctrl / 32 * 4;
shift = drvctrl % 32;
mask = (1U << width) - 1;
@ -368,18 +376,26 @@ static int uniphier_conf_pin_drive_set(struct pinctrl_dev *pctldev,
uniphier_pin_get_drv_type(pin->drv_data);
const unsigned int strength_1bit[] = {4, 8, -1};
const unsigned int strength_2bit[] = {8, 12, 16, 20, -1};
const unsigned int strength_3bit[] = {4, 5, 7, 9, 11, 12, 14, 16, -1};
const unsigned int *supported_strength;
unsigned int drvctrl, reg, shift, mask, width, val;
switch (type) {
case UNIPHIER_PIN_DRV_1BIT:
supported_strength = strength_1bit;
reg = UNIPHIER_PINCTRL_DRVCTRL_BASE;
width = 1;
break;
case UNIPHIER_PIN_DRV_2BIT:
supported_strength = strength_2bit;
reg = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
width = 2;
break;
case UNIPHIER_PIN_DRV_3BIT:
supported_strength = strength_3bit;
reg = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
width = 4;
break;
default:
dev_err(pctldev->dev,
"cannot change drive strength for pin %u (%s)\n",
@ -404,9 +420,6 @@ static int uniphier_conf_pin_drive_set(struct pinctrl_dev *pctldev,
drvctrl = uniphier_pin_get_drvctrl(pin->drv_data);
drvctrl *= width;
reg = (width == 2) ? UNIPHIER_PINCTRL_DRV2CTRL_BASE :
UNIPHIER_PINCTRL_DRVCTRL_BASE;
reg += drvctrl / 32 * 4;
shift = drvctrl % 32;
mask = (1U << width) - 1;

2
drivers/pinctrl/uniphier/pinctrl-uniphier.h
View File

@ -25,6 +25,7 @@ struct platform_device;
#define UNIPHIER_PINCTRL_LOAD_PINMUX 0x700
#define UNIPHIER_PINCTRL_DRVCTRL_BASE 0x800
#define UNIPHIER_PINCTRL_DRV2CTRL_BASE 0x900
#define UNIPHIER_PINCTRL_DRV3CTRL_BASE 0x980
#define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0xa00
#define UNIPHIER_PINCTRL_IECTRL 0xd00
@ -72,6 +73,7 @@ struct platform_device;
enum uniphier_pin_drv_type {
UNIPHIER_PIN_DRV_1BIT, /* 2 level control: 4/8 mA */
UNIPHIER_PIN_DRV_2BIT, /* 4 level control: 8/12/16/20 mA */
UNIPHIER_PIN_DRV_3BIT, /* 8 level control: 4/5/7/9/11/12/14/16 mA */
UNIPHIER_PIN_DRV_FIXED4, /* fixed to 4mA */
UNIPHIER_PIN_DRV_FIXED5, /* fixed to 5mA */
UNIPHIER_PIN_DRV_FIXED8, /* fixed to 8mA */