mfd: Add atmel-hlcdc driver

The HLCDC IP available on some Atmel SoCs (i.e. at91sam9n12, at91sam9x5
family or sama5d3 family) exposes 2 subdevices:
- a display controller (controlled by a DRM driver)
- a PWM chip

The MFD device provides a regmap and several clocks (those connected
to this hardware block) to its subdevices.

This way concurrent accesses to the iomem range are handled by the regmap
framework, and each subdevice can safely access HLCDC registers.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Anthony Harivel <anthony.harivel@emtrion.de>
Tested-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/include/linux/mfd/atmel-hlcdc.h b/include/linux/mfd/atmel-hlcdc.h
new file mode 100644
index 000000000000..1279ab1644b5
--- /dev/null
+++ b/include/linux/mfd/atmel-hlcdc.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_MFD_HLCDC_H
+#define __LINUX_MFD_HLCDC_H
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+
+#define ATMEL_HLCDC_CFG(i)              ((i) * 0x4)
+#define ATMEL_HLCDC_SIG_CFG             LCDCFG(5)
+#define ATMEL_HLCDC_HSPOL               BIT(0)
+#define ATMEL_HLCDC_VSPOL               BIT(1)
+#define ATMEL_HLCDC_VSPDLYS             BIT(2)
+#define ATMEL_HLCDC_VSPDLYE             BIT(3)
+#define ATMEL_HLCDC_DISPPOL             BIT(4)
+#define ATMEL_HLCDC_DITHER              BIT(6)
+#define ATMEL_HLCDC_DISPDLY             BIT(7)
+#define ATMEL_HLCDC_MODE_MASK           GENMASK(9, 8)
+#define ATMEL_HLCDC_PP                  BIT(10)
+#define ATMEL_HLCDC_VSPSU               BIT(12)
+#define ATMEL_HLCDC_VSPHO               BIT(13)
+#define ATMEL_HLCDC_GUARDTIME_MASK      GENMASK(20, 16)
+
+#define ATMEL_HLCDC_EN                  0x20
+#define ATMEL_HLCDC_DIS                 0x24
+#define ATMEL_HLCDC_SR                  0x28
+#define ATMEL_HLCDC_IER                 0x2c
+#define ATMEL_HLCDC_IDR                 0x30
+#define ATMEL_HLCDC_IMR                 0x34
+#define ATMEL_HLCDC_ISR                 0x38
+
+#define ATMEL_HLCDC_CLKPOL              BIT(0)
+#define ATMEL_HLCDC_CLKSEL              BIT(2)
+#define ATMEL_HLCDC_CLKPWMSEL           BIT(3)
+#define ATMEL_HLCDC_CGDIS(i)            BIT(8 + (i))
+#define ATMEL_HLCDC_CLKDIV_SHFT         16
+#define ATMEL_HLCDC_CLKDIV_MASK         GENMASK(23, 16)
+#define ATMEL_HLCDC_CLKDIV(div)         ((div - 2) << ATMEL_HLCDC_CLKDIV_SHFT)
+
+#define ATMEL_HLCDC_PIXEL_CLK           BIT(0)
+#define ATMEL_HLCDC_SYNC                BIT(1)
+#define ATMEL_HLCDC_DISP                BIT(2)
+#define ATMEL_HLCDC_PWM                 BIT(3)
+#define ATMEL_HLCDC_SIP                 BIT(4)
+
+#define ATMEL_HLCDC_SOF                 BIT(0)
+#define ATMEL_HLCDC_SYNCDIS             BIT(1)
+#define ATMEL_HLCDC_FIFOERR             BIT(4)
+#define ATMEL_HLCDC_LAYER_STATUS(x)     BIT((x) + 8)
+
+/**
+ * Structure shared by the MFD device and its subdevices.
+ *
+ * @regmap: register map used to access HLCDC IP registers
+ * @periph_clk: the hlcdc peripheral clock
+ * @sys_clk: the hlcdc system clock
+ * @slow_clk: the system slow clk
+ * @irq: the hlcdc irq
+ */
+struct atmel_hlcdc {
+        struct regmap *regmap;
+        struct clk *periph_clk;
+        struct clk *sys_clk;
+        struct clk *slow_clk;
+        int irq;
+};
+
+#endif /* __LINUX_MFD_HLCDC_H */