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: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: linux-gpio@vger.kernel.org Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
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@ -21,16 +21,21 @@
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include "core.h"
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#include "sh_pfc.h"
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/*
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* All pins assigned to GPIO bank 3 can be used for SD interfaces in
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* which case they support both 3.3V and 1.8V signalling.
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*/
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#define CPU_ALL_PORT(fn, sfx) \
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PORT_GP_32(0, fn, sfx), \
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PORT_GP_30(1, fn, sfx), \
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PORT_GP_30(2, fn, sfx), \
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PORT_GP_32(3, fn, sfx), \
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PORT_GP_CFG_32(3, fn, sfx, SH_PFC_PIN_CFG_IO_VOLTAGE), \
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PORT_GP_32(4, fn, sfx), \
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PORT_GP_32(5, fn, sfx)
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@ -4691,6 +4696,47 @@ static const char * const vin3_groups[] = {
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"vin3_clk",
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};
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#define IOCTRL6 0x8c
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static int r8a7790_get_io_voltage(struct sh_pfc *pfc, unsigned int pin)
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{
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u32 data, mask;
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if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31), "invalid pin %#x", pin))
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return -EINVAL;
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data = ioread32(pfc->windows->virt + IOCTRL6),
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/* Bits in IOCTRL6 are numbered in opposite order to pins */
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mask = 0x80000000 >> (pin & 0x1f);
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return (data & mask) ? 3300 : 1800;
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}
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static int r8a7790_set_io_voltage(struct sh_pfc *pfc, unsigned int pin, u16 mV)
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{
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u32 data, mask;
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if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31), "invalid pin %#x", pin))
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return -EINVAL;
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if (mV != 1800 && mV != 3300)
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return -EINVAL;
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data = ioread32(pfc->windows->virt + IOCTRL6);
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/* Bits in IOCTRL6 are numbered in opposite order to pins */
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mask = 0x80000000 >> (pin & 0x1f);
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if (mV == 3300)
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data |= mask;
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else
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data &= ~mask;
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iowrite32(~data, pfc->windows->virt); /* unlock reg */
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iowrite32(data, pfc->windows->virt + IOCTRL6);
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return 0;
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}
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static const struct sh_pfc_function pinmux_functions[] = {
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SH_PFC_FUNCTION(audio_clk),
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SH_PFC_FUNCTION(avb),
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@ -5690,8 +5736,14 @@ static const struct pinmux_cfg_reg pinmux_config_regs[] = {
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{ },
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};
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static const struct sh_pfc_soc_operations pinmux_ops = {
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.get_io_voltage = r8a7790_get_io_voltage,
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.set_io_voltage = r8a7790_set_io_voltage,
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};
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const struct sh_pfc_soc_info r8a7790_pinmux_info = {
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.name = "r8a77900_pfc",
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.ops = &pinmux_ops,
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.unlock_reg = 0xe6060000, /* PMMR */
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.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },
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