Blackfin arch: cleanup and promote the general purpose timers api to a core blackfin component

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

2 files changed, 251 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
index 8aeb6066b19b..8a4cfb293b27 100644
--- a/arch/blackfin/kernel/Makefile
+++ b/arch/blackfin/kernel/Makefile
@@ -9,6 +9,7 @@ obj-y := \
         sys_bfin.o time.o traps.o irqchip.o dma-mapping.o flat.o \
         fixed_code.o cplbinit.o cacheinit.o reboot.o bfin_gpio.o
 
+obj-$(CONFIG_BFIN_GPTIMERS)          += gptimers.o
 obj-$(CONFIG_MODULES)                += module.o
 obj-$(CONFIG_BFIN_DMA_5XX)           += bfin_dma_5xx.o
 obj-$(CONFIG_DUAL_CORE_TEST_MODULE)  += dualcore_test.o
diff --git a/arch/blackfin/kernel/gptimers.c b/arch/blackfin/kernel/gptimers.c
new file mode 100644
index 000000000000..cb7ba9bfc79c
--- /dev/null
+++ b/arch/blackfin/kernel/gptimers.c
@@ -0,0 +1,250 @@
+/*
+ * bfin_gptimers.c - derived from bf53x_timers.c
+ *  Driver for General Purpose Timer functions on the Blackfin processor
+ *
+ *  Copyright (C) 2005 John DeHority
+ *  Copyright (C) 2006 Hella Aglaia GmbH (awe@aglaia-gmbh.de)
+ *
+ * Licensed under the GPLv2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/blackfin.h>
+#include <asm/gptimers.h>
+
+#ifdef DEBUG
+# define tassert(expr)
+#else
+# define tassert(expr) \
+        if (!(expr)) \
+                printk(KERN_DEBUG "%s:%s:%i: Assertion failed: " #expr "\n", \
+                        __FILE__, __func__, __LINE__);
+#endif
+
+#define BFIN_TIMER_NUM_GROUP  (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)
+
+typedef struct {
+        uint16_t config;
+        uint16_t __pad;
+        uint32_t counter;
+        uint32_t period;
+        uint32_t width;
+} GPTIMER_timer_regs;
+
+typedef struct {
+        uint16_t enable;
+        uint16_t __pad0;
+        uint16_t disable;
+        uint16_t __pad1;
+        uint32_t status;
+} GPTIMER_group_regs;
+
+static volatile GPTIMER_timer_regs *const timer_regs[MAX_BLACKFIN_GPTIMERS] =
+{
+        (GPTIMER_timer_regs *)TIMER0_CONFIG,
+        (GPTIMER_timer_regs *)TIMER1_CONFIG,
+        (GPTIMER_timer_regs *)TIMER2_CONFIG,
+#if (MAX_BLACKFIN_GPTIMERS > 3)
+        (GPTIMER_timer_regs *)TIMER3_CONFIG,
+        (GPTIMER_timer_regs *)TIMER4_CONFIG,
+        (GPTIMER_timer_regs *)TIMER5_CONFIG,
+        (GPTIMER_timer_regs *)TIMER6_CONFIG,
+        (GPTIMER_timer_regs *)TIMER7_CONFIG,
+#endif
+#if (MAX_BLACKFIN_GPTIMERS > 8)
+        (GPTIMER_timer_regs *)TIMER8_CONFIG,
+        (GPTIMER_timer_regs *)TIMER9_CONFIG,
+        (GPTIMER_timer_regs *)TIMER10_CONFIG,
+        (GPTIMER_timer_regs *)TIMER11_CONFIG,
+#endif
+};
+
+static volatile GPTIMER_group_regs *const group_regs[BFIN_TIMER_NUM_GROUP] =
+{
+        (GPTIMER_group_regs *)TIMER0_GROUP_REG,
+#if (MAX_BLACKFIN_GPTIMERS > 8)
+        (GPTIMER_group_regs *)TIMER8_GROUP_REG,
+#endif
+};
+
+static uint32_t const dis_mask[MAX_BLACKFIN_GPTIMERS] =
+{
+        TIMER_STATUS_TRUN0,
+        TIMER_STATUS_TRUN1,
+        TIMER_STATUS_TRUN2,
+#if (MAX_BLACKFIN_GPTIMERS > 3)
+        TIMER_STATUS_TRUN3,
+        TIMER_STATUS_TRUN4,
+        TIMER_STATUS_TRUN5,
+        TIMER_STATUS_TRUN6,
+        TIMER_STATUS_TRUN7,
+#endif
+#if (MAX_BLACKFIN_GPTIMERS > 8)
+        TIMER_STATUS_TRUN8,
+        TIMER_STATUS_TRUN9,
+        TIMER_STATUS_TRUN10,
+        TIMER_STATUS_TRUN11,
+#endif
+};
+
+static uint32_t const irq_mask[MAX_BLACKFIN_GPTIMERS] =
+{
+        TIMER_STATUS_TIMIL0,
+        TIMER_STATUS_TIMIL1,
+        TIMER_STATUS_TIMIL2,
+#if (MAX_BLACKFIN_GPTIMERS > 3)
+        TIMER_STATUS_TIMIL3,
+        TIMER_STATUS_TIMIL4,
+        TIMER_STATUS_TIMIL5,
+        TIMER_STATUS_TIMIL6,
+        TIMER_STATUS_TIMIL7,
+#endif
+#if (MAX_BLACKFIN_GPTIMERS > 8)
+        TIMER_STATUS_TIMIL8,
+        TIMER_STATUS_TIMIL9,
+        TIMER_STATUS_TIMIL10,
+        TIMER_STATUS_TIMIL11,
+#endif
+};
+
+void set_gptimer_pwidth(int timer_id, uint32_t value)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        timer_regs[timer_id]->width = value;
+        SSYNC();
+}
+EXPORT_SYMBOL(set_gptimer_pwidth);
+
+uint32_t get_gptimer_pwidth(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        return timer_regs[timer_id]->width;
+}
+EXPORT_SYMBOL(get_gptimer_pwidth);
+
+void set_gptimer_period(int timer_id, uint32_t period)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        timer_regs[timer_id]->period = period;
+        SSYNC();
+}
+EXPORT_SYMBOL(set_gptimer_period);
+
+uint32_t get_gptimer_period(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        return timer_regs[timer_id]->period;
+}
+EXPORT_SYMBOL(get_gptimer_period);
+
+uint32_t get_gptimer_count(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        return timer_regs[timer_id]->counter;
+}
+EXPORT_SYMBOL(get_gptimer_count);
+
+uint32_t get_gptimer_status(int group)
+{
+        tassert(group < BFIN_TIMER_NUM_GROUP);
+        return group_regs[group]->status;
+}
+EXPORT_SYMBOL(get_gptimer_status);
+
+void set_gptimer_status(int group, uint32_t value)
+{
+        tassert(group < BFIN_TIMER_NUM_GROUP);
+        group_regs[group]->status = value;
+        SSYNC();
+}
+EXPORT_SYMBOL(set_gptimer_status);
+
+uint16_t get_gptimer_intr(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & irq_mask[timer_id]) ? 1 : 0;
+}
+EXPORT_SYMBOL(get_gptimer_intr);
+
+void clear_gptimer_intr(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        group_regs[BFIN_TIMER_OCTET(timer_id)]->status = irq_mask[timer_id];
+}
+EXPORT_SYMBOL(clear_gptimer_intr);
+
+void set_gptimer_config(int timer_id, uint16_t config)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        timer_regs[timer_id]->config = config;
+        SSYNC();
+}
+EXPORT_SYMBOL(set_gptimer_config);
+
+uint16_t get_gptimer_config(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        return timer_regs[timer_id]->config;
+}
+EXPORT_SYMBOL(get_gptimer_config);
+
+void enable_gptimers(uint16_t mask)
+{
+        int i;
+        tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
+        for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
+                group_regs[i]->enable = mask & 0xFF;
+                mask >>= 8;
+        }
+        SSYNC();
+}
+EXPORT_SYMBOL(enable_gptimers);
+
+void disable_gptimers(uint16_t mask)
+{
+        int i;
+        uint16_t m = mask;
+        tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
+        for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
+                group_regs[i]->disable = m & 0xFF;
+                m >>= 8;
+        }
+        for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
+                if (mask & (1 << i))
+                        group_regs[BFIN_TIMER_OCTET(i)]->status |= dis_mask[i];
+        SSYNC();
+}
+EXPORT_SYMBOL(disable_gptimers);
+
+void set_gptimer_pulse_hi(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        timer_regs[timer_id]->config |= TIMER_PULSE_HI;
+        SSYNC();
+}
+EXPORT_SYMBOL(set_gptimer_pulse_hi);
+
+void clear_gptimer_pulse_hi(int timer_id)
+{
+        tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
+        timer_regs[timer_id]->config &= ~TIMER_PULSE_HI;
+        SSYNC();
+}
+EXPORT_SYMBOL(clear_gptimer_pulse_hi);
+
+uint16_t get_enabled_gptimers(void)
+{
+        int i;
+        uint16_t result = 0;
+        for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
+                result |= (group_regs[i]->enable << (i << 3));
+        return result;
+}
+EXPORT_SYMBOL(get_enabled_gptimers);
+
+MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
+MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
+MODULE_LICENSE("GPL");