[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>

2 files changed, 183 insertions, 194 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 */
diff --git a/include/asm-arm/arch-pxa/mfp.h b/include/asm-arm/arch-pxa/mfp.h
index 60fbed1b2e89..02f6157396d3 100644
--- a/include/asm-arm/arch-pxa/mfp.h
+++ b/include/asm-arm/arch-pxa/mfp.h
@@ -16,9 +16,6 @@
 #ifndef __ASM_ARCH_MFP_H
 #define __ASM_ARCH_MFP_H
 
-#define MFPR_BASE       (0x40e10000)
-#define MFPR_SIZE       (PAGE_SIZE)
-
 #define mfp_to_gpio(m)  ((m) % 128)
 
 /* list of all the configurable MFP pins */
@@ -217,114 +214,21 @@ enum {
 };
 
 /*
- * 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 14d)   (bit 13d)
- *
- * 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 MFP_LPM_DRIVE_LOW       0x8
-#define MFP_LPM_DRIVE_HIGH      0x6
-#define MFP_LPM_PULL_HIGH       0x7
-#define MFP_LPM_PULL_LOW        0x9
-#define MFP_LPM_FLOAT           0x1
-#define MFP_LPM_PULL_NEITHER    0x0
-
-/*
- * The pullup and pulldown state of the MFP pin is by default determined by
- * selected alternate function. In case some buggy devices need to override
- * this default behavior,  pxa3xx_mfp_set_pull() can be invoked with one of
- * the following definition as the parameter.
- *
- * Definition       pull_sel  pullup_en  pulldown_en
- * MFP_PULL_HIGH        1         1        0
- * MFP_PULL_LOW         1         0        1
- * MFP_PULL_BOTH        1         1        1
- * MFP_PULL_NONE        1         0        0
- * MFP_PULL_DEFAULT     0         X        X
- *
- * NOTE: pxa3xx_mfp_set_pull() will modify the PULLUP_EN and PULLDOWN_EN
- * bits,  which will cause potential conflicts with the low power mode
- * setting, device drivers should take care of this
- */
-#define MFP_PULL_BOTH           (0x7u)
-#define MFP_PULL_HIGH           (0x6u)
-#define MFP_PULL_LOW            (0x5u)
-#define MFP_PULL_NONE           (0x4u)
-#define MFP_PULL_DEFAULT        (0x0u)
-
-#define MFP_AF0                 (0)
-#define MFP_AF1                 (1)
-#define MFP_AF2                 (2)
-#define MFP_AF3                 (3)
-#define MFP_AF4                 (4)
-#define MFP_AF5                 (5)
-#define MFP_AF6                 (6)
-#define MFP_AF7                 (7)
-
-#define MFP_DS01X               (0)
-#define MFP_DS02X               (1)
-#define MFP_DS03X               (2)
-#define MFP_DS04X               (3)
-#define MFP_DS06X               (4)
-#define MFP_DS08X               (5)
-#define MFP_DS10X               (6)
-#define MFP_DS12X               (7)
-
-#define MFP_EDGE_BOTH           0x3
-#define MFP_EDGE_RISE           0x2
-#define MFP_EDGE_FALL           0x1
-#define MFP_EDGE_NONE           0x0
-
-#define MFPR_AF_MASK            0x0007
-#define MFPR_DRV_MASK           0x1c00
-#define MFPR_RDH_MASK           0x0200
-#define MFPR_LPM_MASK           0xe180
-#define MFPR_PULL_MASK          0xe000
-#define MFPR_EDGE_MASK          0x0070
-
-#define MFPR_ALT_OFFSET         0
-#define MFPR_ERE_OFFSET         4
-#define MFPR_EFE_OFFSET         5
-#define MFPR_EC_OFFSET          6
-#define MFPR_SON_OFFSET         7
-#define MFPR_SD_OFFSET          8
-#define MFPR_SS_OFFSET          9
-#define MFPR_DRV_OFFSET         10
-#define MFPR_PD_OFFSET          13
-#define MFPR_PU_OFFSET          14
-#define MFPR_PS_OFFSET          15
-
-#define MFPR(af, drv, rdh, lpm, edge) \
-        (((af) & 0x7) | (((drv) & 0x7) << 10) |\
-         (((rdh) & 0x1) << 9) |\
-         (((lpm) & 0x3) << 7) |\
-         (((lpm) & 0x4) << 12)|\
-         (((lpm) & 0x8) << 10)|\
-         ((!(edge)) << 6) |\
-         (((edge) & 0x1) << 5) |\
-         (((edge) & 0x2) << 3))
-
-/*
  * a possible MFP configuration is represented by a 32-bit integer
- * bit  0..15 - MFPR value (16-bit)
- * bit 16..31 - mfp pin index (used to obtain the MFPR offset)
+ *
+ * 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
  *
  * to facilitate the definition, the following macros are provided
  *
- * MFPR_DEFAULT - default MFPR value, with
+ * MFP_CFG_DEFAULT - default MFP configuration value, with
  *                alternate function = 0,
- *                drive strength = fast 1mA (MFP_DS01X)
+ *                drive strength = fast 3mA (MFP_DS03X)
  *                low power mode = default
- *                release dalay hold = false (RDH bit)
  *                edge detection = none
  *
  * MFP_CFG      - default MFPR value with alternate function
@@ -334,104 +238,74 @@ enum {
  *                low power mode
  * MFP_CFG_X    - default MFPR value with alternate function,
  *                pin drive strength and low power mode
- *
- * use
- *
- * MFP_CFG_PIN  - to get the MFP pin index
- * MFP_CFG_VAL  - to get the corresponding MFPR value
  */
 
-typedef uint32_t mfp_cfg_t;
-
-#define MFP_CFG_PIN(mfp_cfg)    (((mfp_cfg) >> 16) & 0xffff)
-#define MFP_CFG_VAL(mfp_cfg)    ((mfp_cfg) & 0xffff)
-
-/*
- * MFP register defaults to
- *   drive strength fast 3mA (010'b)
- *   edge detection logic disabled
- *   alternate function 0
- */
-#define MFPR_DEFAULT    (0x0840)
+typedef unsigned long mfp_cfg_t;
+
+#define MFP_PIN(x)              ((x) & 0x3ff)
+
+#define MFP_AF0                 (0x0 << 10)
+#define MFP_AF1                 (0x1 << 10)
+#define MFP_AF2                 (0x2 << 10)
+#define MFP_AF3                 (0x3 << 10)
+#define MFP_AF4                 (0x4 << 10)
+#define MFP_AF5                 (0x5 << 10)
+#define MFP_AF6                 (0x6 << 10)
+#define MFP_AF7                 (0x7 << 10)
+#define MFP_AF_MASK             (0x7 << 10)
+#define MFP_AF(x)               (((x) >> 10) & 0x7)
+
+#define MFP_DS01X               (0x0 << 13)
+#define MFP_DS02X               (0x1 << 13)
+#define MFP_DS03X               (0x2 << 13)
+#define MFP_DS04X               (0x3 << 13)
+#define MFP_DS06X               (0x4 << 13)
+#define MFP_DS08X               (0x5 << 13)
+#define MFP_DS10X               (0x6 << 13)
+#define MFP_DS13X               (0x7 << 13)
+#define MFP_DS_MASK             (0x7 << 13)
+#define MFP_DS(x)               (((x) >> 13) & 0x7)
+
+#define MFP_LPM_INPUT           (0x0 << 16)
+#define MFP_LPM_DRIVE_LOW       (0x1 << 16)
+#define MFP_LPM_DRIVE_HIGH      (0x2 << 16)
+#define MFP_LPM_PULL_LOW        (0x3 << 16)
+#define MFP_LPM_PULL_HIGH       (0x4 << 16)
+#define MFP_LPM_FLOAT           (0x5 << 16)
+#define MFP_LPM_STATE_MASK      (0x7 << 16)
+#define MFP_LPM_STATE(x)        (((x) >> 16) & 0x7)
+
+#define MFP_LPM_EDGE_NONE       (0x0 << 19)
+#define MFP_LPM_EDGE_RISE       (0x1 << 19)
+#define MFP_LPM_EDGE_FALL       (0x2 << 19)
+#define MFP_LPM_EDGE_BOTH       (0x3 << 19)
+#define MFP_LPM_EDGE_MASK       (0x3 << 19)
+#define MFP_LPM_EDGE(x)         (((x) >> 19) & 0x3)
+
+#define MFP_PULL_NONE           (0x0 << 21)
+#define MFP_PULL_LOW            (0x1 << 21)
+#define MFP_PULL_HIGH           (0x2 << 21)
+#define MFP_PULL_BOTH           (0x3 << 21)
+#define MFP_PULL_MASK           (0x3 << 21)
+#define MFP_PULL(x)             (((x) >> 21) & 0x3)
+
+#define MFP_CFG_DEFAULT         (MFP_AF0 | MFP_DS03X | MFP_LPM_INPUT |\
+                                 MFP_LPM_EDGE_NONE | MFP_PULL_NONE)
 
 #define MFP_CFG(pin, af)                \
-        ((MFP_PIN_##pin << 16) | MFPR_DEFAULT | (MFP_##af))
+        ((MFP_CFG_DEFAULT & ~MFP_AF_MASK) |\
+         (MFP_PIN(MFP_PIN_##pin) | MFP_##af))
 
 #define MFP_CFG_DRV(pin, af, drv)       \
-        ((MFP_PIN_##pin << 16) | (MFPR_DEFAULT & ~MFPR_DRV_MASK) |\
-         ((MFP_##drv) << 10) | (MFP_##af))
+        ((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_DS_MASK)) |\
+         (MFP_PIN(MFP_PIN_##pin) | MFP_##af | MFP_##drv))
 
 #define MFP_CFG_LPM(pin, af, lpm)       \
-        ((MFP_PIN_##pin << 16) | (MFPR_DEFAULT & ~MFPR_LPM_MASK) |\
-         (((MFP_LPM_##lpm) & 0x3) << 7)  |\
-         (((MFP_LPM_##lpm) & 0x4) << 12) |\
-         (((MFP_LPM_##lpm) & 0x8) << 10) |\
-         (MFP_##af))
+        ((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_LPM_STATE_MASK)) |\
+         (MFP_PIN(MFP_PIN_##pin) | MFP_##af | MFP_LPM_##lpm))
 
 #define MFP_CFG_X(pin, af, drv, lpm)    \
-        ((MFP_PIN_##pin << 16) |\
-         (MFPR_DEFAULT & ~(MFPR_DRV_MASK | MFPR_LPM_MASK)) |\
-         ((MFP_##drv) << 10) | (MFP_##af) |\
-         (((MFP_LPM_##lpm) & 0x3) << 7)  |\
-         (((MFP_LPM_##lpm) & 0x4) << 12) |\
-         (((MFP_LPM_##lpm) & 0x8) << 10))
-
-/*
- * 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 }
-
-struct pxa3xx_mfp_pin {
-        unsigned long   mfpr_off;       /* MFPRxx register offset */
-        unsigned long   mfpr_val;       /* MFPRxx register value */
-};
-
-/*
- * 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(mfp_cfg_t *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);
+        ((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_DS_MASK | MFP_LPM_STATE_MASK)) |\
+         (MFP_PIN(MFP_PIN_##pin) | MFP_##af | MFP_##drv | MFP_LPM_##lpm))
 
 #endif /* __ASM_ARCH_MFP_H */