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authorSimon Horman <horms+renesas@verge.net.au>2016-09-12 09:36:34 +0200
committerGeert Uytterhoeven <geert+renesas@glider.be>2016-09-14 09:26:49 +0200
commit0e1396f101da63c1ea3a1868d6e549f3ca20dd5b (patch)
tree18deda33eef59300c1d07901d014f25265f58cea /drivers/pinctrl
parent9a6caa13f85e8ed7f2079acd8fe01a8d11ab3413 (diff)
downloadlinux-0e1396f101da63c1ea3a1868d6e549f3ca20dd5b.tar.bz2
pinctrl: sh-pfc: r8a7791: Implement voltage switching for SDHI
All the SHDIs can operate with either 3.3V or 1.8V signals, depending on negotiation with the card. Based on work by Wolfram Sang for the r8a7790. Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/sh-pfc/pfc-r8a7791.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a7791.c b/drivers/pinctrl/sh-pfc/pfc-r8a7791.c
index 0c1a60c9a844..7ca37c3019ab 100644
--- a/drivers/pinctrl/sh-pfc/pfc-r8a7791.c
+++ b/drivers/pinctrl/sh-pfc/pfc-r8a7791.c
@@ -13,6 +13,10 @@
#include "sh_pfc.h"
+/*
+ * Pins 0-23 assigned to GPIO bank 6 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_26(1, fn, sfx), \
@@ -20,7 +24,15 @@
PORT_GP_32(3, fn, sfx), \
PORT_GP_32(4, fn, sfx), \
PORT_GP_32(5, fn, sfx), \
- PORT_GP_32(6, fn, sfx), \
+ PORT_GP_CFG_24(6, fn, sfx, SH_PFC_PIN_CFG_IO_VOLTAGE), \
+ PORT_GP_1(6, 24, fn, sfx), \
+ PORT_GP_1(6, 25, fn, sfx), \
+ PORT_GP_1(6, 26, fn, sfx), \
+ PORT_GP_1(6, 27, fn, sfx), \
+ PORT_GP_1(6, 28, fn, sfx), \
+ PORT_GP_1(6, 29, fn, sfx), \
+ PORT_GP_1(6, 30, fn, sfx), \
+ PORT_GP_1(6, 31, fn, sfx), \
PORT_GP_26(7, fn, sfx)
enum {
@@ -6404,9 +6416,24 @@ static const struct pinmux_cfg_reg pinmux_config_regs[] = {
{ },
};
+static int r8a7791_pin_to_pocctrl(struct sh_pfc *pfc, unsigned int pin, u32 *pocctrl)
+{
+ if (pin < RCAR_GP_PIN(6, 0) || pin > RCAR_GP_PIN(6, 23))
+ return -EINVAL;
+
+ *pocctrl = 0xe606008c;
+
+ return 31 - (pin & 0x1f);
+}
+
+static const struct sh_pfc_soc_operations r8a7791_pinmux_ops = {
+ .pin_to_pocctrl = r8a7791_pin_to_pocctrl,
+};
+
#ifdef CONFIG_PINCTRL_PFC_R8A7791
const struct sh_pfc_soc_info r8a7791_pinmux_info = {
.name = "r8a77910_pfc",
+ .ops = &r8a7791_pinmux_ops,
.unlock_reg = 0xe6060000, /* PMMR */
.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },