ACPI: EC: Simplify acpi_hw_low_level*() with inb()/outb().

Simplify acpi_hw_low_level_xxx() functions to inb() and outb().

Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 45 insertions, 79 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 0f232e719daf..ae05e8c11480 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -72,7 +72,7 @@ enum {
 
 enum {
         EC_INTR = 1,    /* Output buffer full */
-        EC_POLL,                /* Input buffer empty */
+        EC_POLL,        /* Input buffer empty */
 };
 
 static int acpi_ec_remove(struct acpi_device *device, int type);
@@ -91,22 +91,20 @@ static struct acpi_driver acpi_ec_driver = {
                 .stop = acpi_ec_stop,
                 },
 };
+
+/* If we find an EC via the ECDT, we need to keep a ptr to its context */
 struct acpi_ec {
         acpi_handle handle;
         unsigned long uid;
         unsigned long gpe_bit;
-        struct acpi_generic_address status_addr;
-        struct acpi_generic_address command_addr;
-        struct acpi_generic_address data_addr;
+        unsigned long command_addr;
+        unsigned long data_addr;
         unsigned long global_lock;
         struct semaphore sem;
         unsigned int expect_event;
         atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
         wait_queue_head_t wait;
-};
-
-/* If we find an EC via the ECDT, we need to keep a ptr to its context */
-static struct acpi_ec *ec_ecdt;
+} *ec_ecdt;
 
 /* External interfaces use first EC only, so remember */
 static struct acpi_device *first_ec;
@@ -116,34 +114,28 @@ static int acpi_ec_mode = EC_INTR;
                              Transaction Management
    -------------------------------------------------------------------------- */
 
-static u32 acpi_ec_read_status(struct acpi_ec *ec)
+static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
 {
-        u32 status = 0;
-
-        acpi_hw_low_level_read(8, &status, &ec->status_addr);
-        return status;
+        return inb(ec->command_addr);
 }
 
-static u32 acpi_ec_read_data(struct acpi_ec *ec)
+static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
 {
-        u32 data = 0;
-
-        acpi_hw_low_level_read(8, &data, &ec->data_addr);
-        return data;
+        return inb(ec->data_addr);
 }
 
-static void acpi_ec_write_cmd(struct acpi_ec *ec, u32 command)
+static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
 {
-        acpi_hw_low_level_write(8, command, &ec->command_addr);
+        outb(command, ec->command_addr);
 }
 
-static void acpi_ec_write_data(struct acpi_ec *ec, u32 data)
+static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
 {
-        acpi_hw_low_level_write(8, data, &ec->data_addr);
+        outb(data, ec->data_addr);
 }
 
-static int acpi_ec_check_status(u32 status, u8 event) {
-
+static int acpi_ec_check_status(u8 status, u8 event)
+{
         switch (event) {
         case ACPI_EC_EVENT_OBF_1:
                 if (status & ACPI_EC_FLAG_OBF)
@@ -201,8 +193,8 @@ static int acpi_ec_wait(struct acpi_ec *ec, u8 event)
  */
 int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
 {
-        u32 tmp = 0;
-        u32 status = 0;
+        u8 tmp = 0;
+        u8 status = 0;
 
 
         status = acpi_ec_read_status(ec);
@@ -227,7 +219,7 @@ int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
 
 int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
 {
-        u32 status = 0;
+        u8 status = 0;
 
 
         status = acpi_ec_read_status(ec);
@@ -268,14 +260,11 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
         }
 
         for (; rdata_len > 0; rdata_len --) {
-                u32 d;
-
                 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
                 if (result)
                         return result;
 
-                d = acpi_ec_read_data(ec);
-                *(rdata++) = (u8) d;
+                *(rdata++) = acpi_ec_read_data(ec);
         }
 
         return 0;
@@ -320,7 +309,7 @@ end:
         return status;
 }
 
-static int acpi_ec_read(struct acpi_ec *ec, u8 address, u32 * data)
+static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data)
 {
         int result;
         u8 d;
@@ -330,6 +319,7 @@ static int acpi_ec_read(struct acpi_ec *ec, u8 address, u32 * data)
         *data = d;
         return result;
 }
+
 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
 {
         u8 wdata[2] = { address, data };
@@ -340,11 +330,11 @@ static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
 /*
  * Externally callable EC access functions. For now, assume 1 EC only
  */
-int ec_read(u8 addr, u8 * val)
+int ec_read(u8 addr, u8 *val)
 {
         struct acpi_ec *ec;
         int err;
-        u32 temp_data;
+        u8 temp_data;
 
         if (!first_ec)
                 return -ENODEV;
@@ -394,7 +384,7 @@ extern int ec_transaction(u8 command,
                                    wdata_len, rdata, rdata_len);
 }
 
-static int acpi_ec_query(struct acpi_ec *ec, u32 * data)
+static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
 {
         int result;
         u8 d;
@@ -431,14 +421,10 @@ struct acpi_ec_query_data {
 static void acpi_ec_gpe_query(void *ec_cxt)
 {
         struct acpi_ec *ec = (struct acpi_ec *)ec_cxt;
-        u32 value = 0;
-        static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
-        const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
-                '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
-        };
-
+        u8 value = 0;
+        static char object_name[8];
 
-        if (!ec_cxt)
+        if (!ec)
                 goto end;
 
         value = acpi_ec_read_status(ec);
@@ -449,8 +435,7 @@ static void acpi_ec_gpe_query(void *ec_cxt)
         if (acpi_ec_query(ec, &value))
                 goto end;
 
-        object_name[2] = hex[((value >> 4) & 0x0F)];
-        object_name[3] = hex[(value & 0x0F)];
+        snprintf(object_name, 8, "_Q%2.2X", value);
 
         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name));
 
@@ -463,8 +448,7 @@ static void acpi_ec_gpe_query(void *ec_cxt)
 static u32 acpi_ec_gpe_handler(void *data)
 {
         acpi_status status = AE_OK;
-        u32 value;
-        u8 exec_mode;
+        u8 value;
         struct acpi_ec *ec = (struct acpi_ec *)data;
 
         acpi_clear_gpe(NULL, ec->gpe_bit, ACPI_ISR);
@@ -475,13 +459,10 @@ static u32 acpi_ec_gpe_handler(void *data)
                         ec->expect_event = 0;
                         wake_up(&ec->wait);
                 }
-                exec_mode = OSL_EC_BURST_HANDLER;
-        } else {
-                exec_mode = OSL_EC_POLL_HANDLER;
         }
 
         if (value & ACPI_EC_FLAG_SCI) {
-                status = acpi_os_execute(exec_mode, acpi_ec_gpe_query, ec);
+                status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec);
                 return status == AE_OK ?
                     ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
         }
@@ -535,7 +516,7 @@ acpi_ec_space_handler(u32 function,
         switch (function) {
         case ACPI_READ:
                 temp = 0;
-                result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
+                result = acpi_ec_read(ec, (u8) address, (u8 *) &temp);
                 break;
         case ACPI_WRITE:
                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
@@ -595,8 +576,8 @@ static int acpi_ec_read_info(struct seq_file *seq, void *offset)
         seq_printf(seq, "gpe bit:                 0x%02x\n",
                    (u32) ec->gpe_bit);
         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
-                   (u32) ec->status_addr.address,
-                   (u32) ec->data_addr.address);
+                   (u32) ec->command_addr,
+                   (u32) ec->data_addr);
         seq_printf(seq, "use global lock:         %s\n",
                    ec->global_lock ? "yes" : "no");
         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
@@ -752,7 +733,6 @@ static acpi_status
 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
 {
         struct acpi_ec *ec = (struct acpi_ec *)context;
-        struct acpi_generic_address *addr;
 
         if (resource->type != ACPI_RESOURCE_TYPE_IO) {
                 return AE_OK;
@@ -763,19 +743,14 @@ acpi_ec_io_ports(struct acpi_resource *resource, void *context)
          * the second address region returned is the status/command
          * port.
          */
-        if (ec->data_addr.register_bit_width == 0) {
-                addr = &ec->data_addr;
-        } else if (ec->command_addr.register_bit_width == 0) {
-                addr = &ec->command_addr;
+        if (ec->data_addr == 0) {
+                ec->data_addr = resource->data.io.minimum;
+        } else if (ec->command_addr == 0) {
+                ec->command_addr = resource->data.io.minimum;
         } else {
                 return AE_CTRL_TERMINATE;
         }
 
-        addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
-        addr->register_bit_width = 8;
-        addr->register_bit_offset = 0;
-        addr->address = resource->data.io.minimum;
-
         return AE_OK;
 }
 
@@ -798,19 +773,14 @@ static int acpi_ec_start(struct acpi_device *device)
          */
         status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
                                      acpi_ec_io_ports, ec);
-        if (ACPI_FAILURE(status)
-            || ec->command_addr.register_bit_width == 0) {
+        if (ACPI_FAILURE(status) || ec->command_addr == 0) {
                 ACPI_EXCEPTION((AE_INFO, status,
                                 "Error getting I/O port addresses"));
                 return -ENODEV;
         }
 
-        ec->status_addr = ec->command_addr;
-
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x",
-                          (u32) ec->gpe_bit,
-                          (u32) ec->command_addr.address,
-                          (u32) ec->data_addr.address));
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
+                          ec->gpe_bit, ec->command_addr, ec->data_addr));
 
         /*
          * Install GPE handler
@@ -877,7 +847,6 @@ acpi_fake_ecdt_callback(acpi_handle handle,
                                      acpi_ec_io_ports, ec_ecdt);
         if (ACPI_FAILURE(status))
                 return status;
-        ec_ecdt->status_addr = ec_ecdt->command_addr;
 
         ec_ecdt->uid = -1;
         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
@@ -890,10 +859,8 @@ acpi_fake_ecdt_callback(acpi_handle handle,
         ec_ecdt->global_lock = TRUE;
         ec_ecdt->handle = handle;
 
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02x, ports=0x%2x, 0x%2x",
-               (u32) ec_ecdt->gpe_bit,
-               (u32) ec_ecdt->command_addr.address,
-               (u32) ec_ecdt->data_addr.address));
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
+               ec_ecdt->gpe_bit, ec_ecdt->command_addr, ec_ecdt->data_addr));
 
         return AE_CTRL_TERMINATE;
 }
@@ -961,9 +928,8 @@ static int __init acpi_ec_get_real_ecdt(void)
         if (acpi_ec_mode == EC_INTR) {
                 init_waitqueue_head(&ec_ecdt->wait);
         }
-        ec_ecdt->command_addr = ecdt_ptr->ec_control;
-        ec_ecdt->status_addr = ecdt_ptr->ec_control;
-        ec_ecdt->data_addr = ecdt_ptr->ec_data;
+        ec_ecdt->command_addr = ecdt_ptr->ec_control.address;
+        ec_ecdt->data_addr = ecdt_ptr->ec_data.address;
         ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
         /* use the GL just to be safe */
         ec_ecdt->global_lock = TRUE;