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Commit 60d8fcef authored by Wolfram Sang's avatar Wolfram Sang Committed by Geert Uytterhoeven
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pinctrl: sh-pfc: r8a7790: Implement voltage switching for SDHI 



All the SHDIs can operate with either 3.3V or 1.8V signals, depending
on negotiation with the card.

Implement the {get,set}_io_voltage operations and set the related
capability flag for the associated pins.

Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent f55532a0

drivers/pinctrl/sh-pfc/pfc-r8a7790.c

+53 −1
Original line number Diff line number Diff line
@@ -21,16 +21,21 @@ 
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */



#include <linux/io.h>

#include <linux/kernel.h>



#include "core.h"

#include "sh_pfc.h"



/*

 * All pins assigned to GPIO bank 3 can be used for SD interfaces in

 * which case they support both 3.3V and 1.8V signalling.

 */

#define CPU_ALL_PORT(fn, sfx)						\

	PORT_GP_32(0, fn, sfx),						\

	PORT_GP_30(1, fn, sfx),						\

	PORT_GP_30(2, fn, sfx),						\

	PORT_GP_32(3, fn, sfx),						\

	PORT_GP_CFG_32(3, fn, sfx, SH_PFC_PIN_CFG_IO_VOLTAGE),		\

	PORT_GP_32(4, fn, sfx),						\

	PORT_GP_32(5, fn, sfx)
@@ -4691,6 +4696,47 @@ static const char * const vin3_groups[] = { 
	"vin3_clk",

};



#define IOCTRL6 0x8c



static int r8a7790_get_io_voltage(struct sh_pfc *pfc, unsigned int pin)

{

	u32 data, mask;



	if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31), "invalid pin %#x", pin))

		return -EINVAL;



	data = ioread32(pfc->windows->virt + IOCTRL6),

	/* Bits in IOCTRL6 are numbered in opposite order to pins */

	mask = 0x80000000 >> (pin & 0x1f);



	return (data & mask) ? 3300 : 1800;

}



static int r8a7790_set_io_voltage(struct sh_pfc *pfc, unsigned int pin, u16 mV)

{

	u32 data, mask;



	if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31), "invalid pin %#x", pin))

		return -EINVAL;



	if (mV != 1800 && mV != 3300)

		return -EINVAL;



	data = ioread32(pfc->windows->virt + IOCTRL6);

	/* Bits in IOCTRL6 are numbered in opposite order to pins */

	mask = 0x80000000 >> (pin & 0x1f);



	if (mV == 3300)

		data |= mask;

	else

		data &= ~mask;



	iowrite32(~data, pfc->windows->virt); /* unlock reg */

	iowrite32(data, pfc->windows->virt + IOCTRL6);



	return 0;

}



static const struct sh_pfc_function pinmux_functions[] = {

	SH_PFC_FUNCTION(audio_clk),

	SH_PFC_FUNCTION(avb),
@@ -5690,8 +5736,14 @@ static const struct pinmux_cfg_reg pinmux_config_regs[] = { 
	{ },

};



static const struct sh_pfc_soc_operations pinmux_ops = {

	.get_io_voltage = r8a7790_get_io_voltage,

	.set_io_voltage = r8a7790_set_io_voltage,

};



const struct sh_pfc_soc_info r8a7790_pinmux_info = {

	.name = "r8a77900_pfc",

	.ops = &pinmux_ops,

	.unlock_reg = 0xe6060000, /* PMMR */



	.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },