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Diffstat (limited to 'arch/arm/mach-pxa/mfp.c')
-rw-r--r--arch/arm/mach-pxa/mfp.c261
1 files changed, 136 insertions, 125 deletions
diff --git a/arch/arm/mach-pxa/mfp.c b/arch/arm/mach-pxa/mfp.c
index 436f96574964..ec1b2d8f61c4 100644
--- a/arch/arm/mach-pxa/mfp.c
+++ b/arch/arm/mach-pxa/mfp.c
@@ -17,9 +17,11 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/sysdev.h>
#include <asm/hardware.h>
#include <asm/arch/mfp.h>
+#include <asm/arch/mfp-pxa3xx.h>
/* mfp_spin_lock is used to ensure that MFP register configuration
* (most likely a read-modify-write operation) is atomic, and that
@@ -28,43 +30,110 @@
static DEFINE_SPINLOCK(mfp_spin_lock);
static void __iomem *mfpr_mmio_base = (void __iomem *)&__REG(MFPR_BASE);
+
+struct pxa3xx_mfp_pin {
+ unsigned long config; /* -1 for not configured */
+ unsigned long mfpr_off; /* MFPRxx Register offset */
+ unsigned long mfpr_run; /* Run-Mode Register Value */
+ unsigned long mfpr_lpm; /* Low Power Mode Register Value */
+};
+
static struct pxa3xx_mfp_pin mfp_table[MFP_PIN_MAX];
+/* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */
+const static unsigned long mfpr_lpm[] = {
+ MFPR_LPM_INPUT,
+ MFPR_LPM_DRIVE_LOW,
+ MFPR_LPM_DRIVE_HIGH,
+ MFPR_LPM_PULL_LOW,
+ MFPR_LPM_PULL_HIGH,
+ MFPR_LPM_FLOAT,
+};
+
+/* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */
+const static unsigned long mfpr_pull[] = {
+ MFPR_PULL_NONE,
+ MFPR_PULL_LOW,
+ MFPR_PULL_HIGH,
+ MFPR_PULL_BOTH,
+};
+
+/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */
+const static unsigned long mfpr_edge[] = {
+ MFPR_EDGE_NONE,
+ MFPR_EDGE_RISE,
+ MFPR_EDGE_FALL,
+ MFPR_EDGE_BOTH,
+};
+
#define mfpr_readl(off) \
__raw_readl(mfpr_mmio_base + (off))
#define mfpr_writel(off, val) \
__raw_writel(val, mfpr_mmio_base + (off))
+#define mfp_configured(p) ((p)->config != -1)
+
/*
* perform a read-back of any MFPR register to make sure the
* previous writings are finished
*/
#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + 0)
-static inline void __mfp_config(int pin, unsigned long val)
+static inline void __mfp_config_run(struct pxa3xx_mfp_pin *p)
{
- unsigned long off = mfp_table[pin].mfpr_off;
+ if (mfp_configured(p))
+ mfpr_writel(p->mfpr_off, p->mfpr_run);
+}
- mfp_table[pin].mfpr_val = val;
- mfpr_writel(off, val);
+static inline void __mfp_config_lpm(struct pxa3xx_mfp_pin *p)
+{
+ if (mfp_configured(p)) {
+ unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR;
+ if (mfpr_clr != p->mfpr_run)
+ mfpr_writel(p->mfpr_off, mfpr_clr);
+ if (p->mfpr_lpm != mfpr_clr)
+ mfpr_writel(p->mfpr_off, p->mfpr_lpm);
+ }
}
-void pxa3xx_mfp_config(mfp_cfg_t *mfp_cfgs, int num)
+void pxa3xx_mfp_config(unsigned long *mfp_cfgs, int num)
{
- int i, pin;
- unsigned long val, flags;
- mfp_cfg_t *mfp_cfg = mfp_cfgs;
+ unsigned long flags;
+ int i;
spin_lock_irqsave(&mfp_spin_lock, flags);
- for (i = 0; i < num; i++, mfp_cfg++) {
- pin = MFP_CFG_PIN(*mfp_cfg);
- val = MFP_CFG_VAL(*mfp_cfg);
+ for (i = 0; i < num; i++, mfp_cfgs++) {
+ unsigned long tmp, c = *mfp_cfgs;
+ struct pxa3xx_mfp_pin *p;
+ int pin, af, drv, lpm, edge, pull;
+ pin = MFP_PIN(c);
BUG_ON(pin >= MFP_PIN_MAX);
-
- __mfp_config(pin, val);
+ p = &mfp_table[pin];
+
+ af = MFP_AF(c);
+ drv = MFP_DS(c);
+ lpm = MFP_LPM_STATE(c);
+ edge = MFP_LPM_EDGE(c);
+ pull = MFP_PULL(c);
+
+ /* run-mode pull settings will conflict with MFPR bits of
+ * low power mode state, calculate mfpr_run and mfpr_lpm
+ * individually if pull != MFP_PULL_NONE
+ */
+ tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv);
+
+ if (likely(pull == MFP_PULL_NONE)) {
+ p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge];
+ p->mfpr_lpm = p->mfpr_run;
+ } else {
+ p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge];
+ p->mfpr_run = tmp | mfpr_pull[pull];
+ }
+
+ p->config = c; __mfp_config_run(p);
}
mfpr_sync();
@@ -96,140 +165,82 @@ void pxa3xx_mfp_write(int mfp, unsigned long val)
spin_unlock_irqrestore(&mfp_spin_lock, flags);
}
-void pxa3xx_mfp_set_afds(int mfp, int af, int ds)
-{
- uint32_t mfpr_off, mfpr_val;
- unsigned long flags;
-
- BUG_ON(mfp >= MFP_PIN_MAX);
-
- spin_lock_irqsave(&mfp_spin_lock, flags);
- mfpr_off = mfp_table[mfp].mfpr_off;
-
- mfpr_val = mfpr_readl(mfpr_off);
- mfpr_val &= ~(MFPR_AF_MASK | MFPR_DRV_MASK);
- mfpr_val |= (((af & 0x7) << MFPR_ALT_OFFSET) |
- ((ds & 0x7) << MFPR_DRV_OFFSET));
-
- mfpr_writel(mfpr_off, mfpr_val);
- mfpr_sync();
-
- spin_unlock_irqrestore(&mfp_spin_lock, flags);
-}
-
-void pxa3xx_mfp_set_rdh(int mfp, int rdh)
+void __init pxa3xx_mfp_init_addr(struct pxa3xx_mfp_addr_map *map)
{
- uint32_t mfpr_off, mfpr_val;
- unsigned long flags;
-
- BUG_ON(mfp >= MFP_PIN_MAX);
+ struct pxa3xx_mfp_addr_map *p;
+ unsigned long offset, flags;
+ int i;
spin_lock_irqsave(&mfp_spin_lock, flags);
- mfpr_off = mfp_table[mfp].mfpr_off;
-
- mfpr_val = mfpr_readl(mfpr_off);
- mfpr_val &= ~MFPR_RDH_MASK;
-
- if (likely(rdh))
- mfpr_val |= (1u << MFPR_SS_OFFSET);
+ for (p = map; p->start != MFP_PIN_INVALID; p++) {
+ offset = p->offset;
+ i = p->start;
- mfpr_writel(mfpr_off, mfpr_val);
- mfpr_sync();
+ do {
+ mfp_table[i].mfpr_off = offset;
+ mfp_table[i].mfpr_run = 0;
+ mfp_table[i].mfpr_lpm = 0;
+ offset += 4; i++;
+ } while ((i <= p->end) && (p->end != -1));
+ }
spin_unlock_irqrestore(&mfp_spin_lock, flags);
}
-void pxa3xx_mfp_set_lpm(int mfp, int lpm)
+void __init pxa3xx_init_mfp(void)
{
- uint32_t mfpr_off, mfpr_val;
- unsigned long flags;
-
- BUG_ON(mfp >= MFP_PIN_MAX);
-
- spin_lock_irqsave(&mfp_spin_lock, flags);
-
- mfpr_off = mfp_table[mfp].mfpr_off;
- mfpr_val = mfpr_readl(mfpr_off);
- mfpr_val &= ~MFPR_LPM_MASK;
-
- if (lpm & 0x1) mfpr_val |= 1u << MFPR_SON_OFFSET;
- if (lpm & 0x2) mfpr_val |= 1u << MFPR_SD_OFFSET;
- if (lpm & 0x4) mfpr_val |= 1u << MFPR_PU_OFFSET;
- if (lpm & 0x8) mfpr_val |= 1u << MFPR_PD_OFFSET;
- if (lpm &0x10) mfpr_val |= 1u << MFPR_PS_OFFSET;
-
- mfpr_writel(mfpr_off, mfpr_val);
- mfpr_sync();
+ int i;
- spin_unlock_irqrestore(&mfp_spin_lock, flags);
+ for (i = 0; i < ARRAY_SIZE(mfp_table); i++)
+ mfp_table[i].config = -1;
}
-void pxa3xx_mfp_set_pull(int mfp, int pull)
+#ifdef CONFIG_PM
+/*
+ * Configure the MFPs appropriately for suspend/resume.
+ * FIXME: this should probably depend on which system state we're
+ * entering - for instance, we might not want to place MFP pins in
+ * a pull-down mode if they're an active low chip select, and we're
+ * just entering standby.
+ */
+static int pxa3xx_mfp_suspend(struct sys_device *d, pm_message_t state)
{
- uint32_t mfpr_off, mfpr_val;
- unsigned long flags;
-
- BUG_ON(mfp >= MFP_PIN_MAX);
-
- spin_lock_irqsave(&mfp_spin_lock, flags);
+ int pin;
- mfpr_off = mfp_table[mfp].mfpr_off;
- mfpr_val = mfpr_readl(mfpr_off);
- mfpr_val &= ~MFPR_PULL_MASK;
- mfpr_val |= ((pull & 0x7u) << MFPR_PD_OFFSET);
-
- mfpr_writel(mfpr_off, mfpr_val);
- mfpr_sync();
-
- spin_unlock_irqrestore(&mfp_spin_lock, flags);
+ for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++) {
+ struct pxa3xx_mfp_pin *p = &mfp_table[pin];
+ __mfp_config_lpm(p);
+ }
+ return 0;
}
-void pxa3xx_mfp_set_edge(int mfp, int edge)
+static int pxa3xx_mfp_resume(struct sys_device *d)
{
- uint32_t mfpr_off, mfpr_val;
- unsigned long flags;
-
- BUG_ON(mfp >= MFP_PIN_MAX);
-
- spin_lock_irqsave(&mfp_spin_lock, flags);
-
- mfpr_off = mfp_table[mfp].mfpr_off;
- mfpr_val = mfpr_readl(mfpr_off);
-
- mfpr_val &= ~MFPR_EDGE_MASK;
- mfpr_val |= (edge & 0x3u) << MFPR_ERE_OFFSET;
- mfpr_val |= (!edge & 0x1) << MFPR_EC_OFFSET;
+ int pin;
- mfpr_writel(mfpr_off, mfpr_val);
- mfpr_sync();
-
- spin_unlock_irqrestore(&mfp_spin_lock, flags);
+ for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++) {
+ struct pxa3xx_mfp_pin *p = &mfp_table[pin];
+ __mfp_config_run(p);
+ }
+ return 0;
}
-void __init pxa3xx_mfp_init_addr(struct pxa3xx_mfp_addr_map *map)
-{
- struct pxa3xx_mfp_addr_map *p;
- unsigned long offset, flags;
- int i;
-
- spin_lock_irqsave(&mfp_spin_lock, flags);
-
- for (p = map; p->start != MFP_PIN_INVALID; p++) {
- offset = p->offset;
- i = p->start;
-
- do {
- mfp_table[i].mfpr_off = offset;
- mfp_table[i].mfpr_val = 0;
- offset += 4; i++;
- } while ((i <= p->end) && (p->end != -1));
- }
+static struct sysdev_class mfp_sysclass = {
+ set_kset_name("mfp"),
+ .suspend = pxa3xx_mfp_suspend,
+ .resume = pxa3xx_mfp_resume,
+};
- spin_unlock_irqrestore(&mfp_spin_lock, flags);
-}
+static struct sys_device mfp_device = {
+ .id = 0,
+ .cls = &mfp_sysclass,
+};
-void __init pxa3xx_init_mfp(void)
+static int __init mfp_init_devicefs(void)
{
- memset(mfp_table, 0, sizeof(mfp_table));
+ sysdev_class_register(&mfp_sysclass);
+ return sysdev_register(&mfp_device);
}
+device_initcall(mfp_init_devicefs);
+#endif