pinctrl: add pinctrl-mxs support

Add pinctrl support for Freescale MXS SoCs, i.MX23 and i.MX28.
The driver supports device tree probe only.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-mxs.h b/drivers/pinctrl/pinctrl-mxs.h
new file mode 100644
index 00000000000..fdd88d0bae2
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-mxs.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#ifndef __PINCTRL_MXS_H
+#define __PINCTRL_MXS_H
+
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#define SET     0x4
+#define CLR     0x8
+#define TOG     0xc
+
+#define MXS_PINCTRL_PIN(pin)    PINCTRL_PIN(pin, #pin)
+#define PINID(bank, pin)        ((bank) * 32 + (pin))
+
+/*
+ * pinmux-id bit field definitions
+ *
+ * bank:        15..12  (4)
+ * pin:         11..4   (8)
+ * muxsel:      3..0    (4)
+ */
+#define MUXID_TO_PINID(m)       PINID((m) >> 12 & 0xf, (m) >> 4 & 0xff)
+#define MUXID_TO_MUXSEL(m)      ((m) & 0xf)
+
+#define PINID_TO_BANK(p)        ((p) >> 5)
+#define PINID_TO_PIN(p)         ((p) % 32)
+
+/*
+ * pin config bit field definitions
+ *
+ * pull-up:     6..5    (2)
+ * voltage:     4..3    (2)
+ * mA:          2..0    (3)
+ *
+ * MSB of each field is presence bit for the config.
+ */
+#define PULL_PRESENT            (1 << 6)
+#define PULL_SHIFT              5
+#define VOL_PRESENT             (1 << 4)
+#define VOL_SHIFT               3
+#define MA_PRESENT              (1 << 2)
+#define MA_SHIFT                0
+#define CONFIG_TO_PULL(c)       ((c) >> PULL_SHIFT & 0x1)
+#define CONFIG_TO_VOL(c)        ((c) >> VOL_SHIFT & 0x1)
+#define CONFIG_TO_MA(c)         ((c) >> MA_SHIFT & 0x3)
+
+struct mxs_function {
+        const char *name;
+        const char **groups;
+        unsigned ngroups;
+};
+
+struct mxs_group {
+        const char *name;
+        unsigned int *pins;
+        unsigned npins;
+        u8 *muxsel;
+        u8 config;
+};
+
+struct mxs_regs {
+        u16 muxsel;
+        u16 drive;
+        u16 pull;
+};
+
+struct mxs_pinctrl_soc_data {
+        const struct mxs_regs *regs;
+        const struct pinctrl_pin_desc *pins;
+        unsigned npins;
+        struct mxs_function *functions;
+        unsigned nfunctions;
+        struct mxs_group *groups;
+        unsigned ngroups;
+};
+
+int mxs_pinctrl_probe(struct platform_device *pdev,
+                      struct mxs_pinctrl_soc_data *soc);
+int mxs_pinctrl_remove(struct platform_device *pdev);
+
+#endif /* __PINCTRL_MXS_H */