[ARM] pxa: make MFP configuration processor independent

There are two reasons for making the MFP configuration to be processor
independent, i.e. removing the relationship of configuration bits with
actual MFPR register settings:

   1. power management sometimes requires the MFP to be configured
      differently when in run mode or in low power mode

   2. for future integration of pxa{25x,27x} GPIO configurations

The modifications include:

1. introducing of processor independent MFP configuration bits, as
   defined in [include/asm-arm/arch-pxa/mfp.h]:

	bit  0.. 9 - MFP Pin Number (1024 Pins Maximum)
	bit 10..12 - Alternate Function Selection
	bit 13..15 - Drive Strength
	bit 16..18 - Low Power Mode State
	bit 19..20 - Low Power Mode Edge Detection
	bit 21..22 - Run Mode Pull State
	and so on,

2. moving the processor dependent code from mfp.h into mfp-pxa3xx.h

3. cleaning up of the MFPR bit definitions

4. mapping of processor independent MFP configuration into processor
   specific MFPR register settings is now totally encapsulated within
   pxa3xx_mfp_config()

5. using of "unsigned long" instead of invented type of "mfp_cfg_t"
   according to Documentation/CodingStyle Chapter 5, usage of this
   in platform code will be slowly removed in later patches

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 115 insertions, 0 deletions

diff --git a/include/asm-arm/arch-pxa/mfp-pxa3xx.h b/include/asm-arm/arch-pxa/mfp-pxa3xx.h
index 5da1857d5476..1f6b35c015d0 100644
--- a/include/asm-arm/arch-pxa/mfp-pxa3xx.h
+++ b/include/asm-arm/arch-pxa/mfp-pxa3xx.h
@@ -1,6 +1,69 @@
 #ifndef __ASM_ARCH_MFP_PXA3XX_H
 #define __ASM_ARCH_MFP_PXA3XX_H
 
+#define MFPR_BASE       (0x40e10000)
+#define MFPR_SIZE       (PAGE_SIZE)
+
+/* MFPR register bit definitions */
+#define MFPR_PULL_SEL           (0x1 << 15)
+#define MFPR_PULLUP_EN          (0x1 << 14)
+#define MFPR_PULLDOWN_EN        (0x1 << 13)
+#define MFPR_SLEEP_SEL          (0x1 << 9)
+#define MFPR_SLEEP_OE_N         (0x1 << 7)
+#define MFPR_EDGE_CLEAR         (0x1 << 6)
+#define MFPR_EDGE_FALL_EN       (0x1 << 5)
+#define MFPR_EDGE_RISE_EN       (0x1 << 4)
+
+#define MFPR_SLEEP_DATA(x)      ((x) << 8)
+#define MFPR_DRIVE(x)           (((x) & 0x7) << 10)
+#define MFPR_AF_SEL(x)          (((x) & 0x7) << 0)
+
+#define MFPR_EDGE_NONE          (0)
+#define MFPR_EDGE_RISE          (MFPR_EDGE_RISE_EN)
+#define MFPR_EDGE_FALL          (MFPR_EDGE_FALL_EN)
+#define MFPR_EDGE_BOTH          (MFPR_EDGE_RISE | MFPR_EDGE_FALL)
+
+/*
+ * Table that determines the low power modes outputs, with actual settings
+ * used in parentheses for don't-care values. Except for the float output,
+ * the configured driven and pulled levels match, so if there is a need for
+ * non-LPM pulled output, the same configuration could probably be used.
+ *
+ * Output value  sleep_oe_n  sleep_data  pullup_en  pulldown_en  pull_sel
+ *                 (bit 7)    (bit 8)    (bit 14)     (bit 13)   (bit 15)
+ *
+ * Input            0          X(0)        X(0)        X(0)       0
+ * Drive 0          0          0           0           X(1)       0
+ * Drive 1          0          1           X(1)        0          0
+ * Pull hi (1)      1          X(1)        1           0          0
+ * Pull lo (0)      1          X(0)        0           1          0
+ * Z (float)        1          X(0)        0           0          0
+ */
+#define MFPR_LPM_INPUT          (0)
+#define MFPR_LPM_DRIVE_LOW      (MFPR_SLEEP_DATA(0) | MFPR_PULLDOWN_EN)
+#define MFPR_LPM_DRIVE_HIGH     (MFPR_SLEEP_DATA(1) | MFPR_PULLUP_EN)
+#define MFPR_LPM_PULL_LOW       (MFPR_LPM_DRIVE_LOW  | MFPR_SLEEP_OE_N)
+#define MFPR_LPM_PULL_HIGH      (MFPR_LPM_DRIVE_HIGH | MFPR_SLEEP_OE_N)
+#define MFPR_LPM_FLOAT          (MFPR_SLEEP_OE_N)
+#define MFPR_LPM_MASK           (0xe080)
+
+/*
+ * The pullup and pulldown state of the MFP pin at run mode is by default
+ * determined by the selected alternate function. In case that some buggy
+ * devices need to override this default behavior,  the definitions below
+ * indicates the setting of corresponding MFPR bits
+ *
+ * Definition       pull_sel  pullup_en  pulldown_en
+ * MFPR_PULL_NONE       0         0        0
+ * MFPR_PULL_LOW        1         0        1
+ * MFPR_PULL_HIGH       1         1        0
+ * MFPR_PULL_BOTH       1         1        1
+ */
+#define MFPR_PULL_NONE          (0)
+#define MFPR_PULL_LOW           (MFPR_PULL_SEL | MFPR_PULLDOWN_EN)
+#define MFPR_PULL_BOTH          (MFPR_PULL_LOW | MFPR_PULLUP_EN)
+#define MFPR_PULL_HIGH          (MFPR_PULL_SEL | MFPR_PULLUP_EN)
+
 /* PXA3xx common MFP configurations - processor specific ones defined
  * in mfp-pxa300.h and mfp-pxa320.h
  */
@@ -134,4 +197,56 @@
 #define GPIO5_2_GPIO            MFP_CFG(GPIO5_2, AF0)
 #define GPIO6_2_GPIO            MFP_CFG(GPIO6_2, AF0)
 
+/*
+ * each MFP pin will have a MFPR register, since the offset of the
+ * register varies between processors, the processor specific code
+ * should initialize the pin offsets by pxa3xx_mfp_init_addr()
+ *
+ * pxa3xx_mfp_init_addr - accepts a table of "pxa3xx_mfp_addr_map"
+ * structure, which represents a range of MFP pins from "start" to
+ * "end", with the offset begining at "offset", to define a single
+ * pin, let "end" = -1
+ *
+ * use
+ *
+ * MFP_ADDR_X() to define a range of pins
+ * MFP_ADDR()   to define a single pin
+ * MFP_ADDR_END to signal the end of pin offset definitions
+ */
+struct pxa3xx_mfp_addr_map {
+        unsigned int    start;
+        unsigned int    end;
+        unsigned long   offset;
+};
+
+#define MFP_ADDR_X(start, end, offset) \
+        { MFP_PIN_##start, MFP_PIN_##end, offset }
+
+#define MFP_ADDR(pin, offset) \
+        { MFP_PIN_##pin, -1, offset }
+
+#define MFP_ADDR_END    { MFP_PIN_INVALID, 0 }
+
+/*
+ * pxa3xx_mfp_read()/pxa3xx_mfp_write() - for direct read/write access
+ * to the MFPR register
+ */
+unsigned long pxa3xx_mfp_read(int mfp);
+void pxa3xx_mfp_write(int mfp, unsigned long mfpr_val);
+
+/*
+ * pxa3xx_mfp_config - configure the MFPR registers
+ *
+ * used by board specific initialization code
+ */
+void pxa3xx_mfp_config(unsigned long *mfp_cfgs, int num);
+
+/*
+ * pxa3xx_mfp_init_addr() - initialize the mapping between mfp pin
+ * index and MFPR register offset
+ *
+ * used by processor specific code
+ */
+void __init pxa3xx_mfp_init_addr(struct pxa3xx_mfp_addr_map *);
+void __init pxa3xx_init_mfp(void);
 #endif /* __ASM_ARCH_MFP_PXA3XX_H */