simple SPI controller implementation on PXA2xx SSP port

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+/*
+ * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef CIRRUS_H_
+#define CIRRUS_H_
+
+#include <linux/list.h>
+#include <linux/spi.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+
+#define READ_CMD 0x21
+#define WRITE_CMD 0x20
+#define TO_MAP(x) ((x & 0x7f) | 0x80)
+#define MAX_POOL_NAME_SIZE 64
+
+struct cirrus_message_pool {
+};
+
+struct cirrus_notification {
+};
+
+struct cirrus_pooled_message {
+};
+
+inline void _cirrus_setup_async(struct spi_message *message, 
+     void (*chip_callback)(void *context), 
+     void (*user_callback)(int length))
+{
+};
+
+inline void *__cirrus_pool_alloc(struct cirrus_message_pool *pool)
+{
+ return NULL; 
+}
+
+inline void __cirrus_pool_free(struct cirrus_message_pool *pool, void* ptr)
+{
+}
+
+inline struct spi_message *_cirrus_alloc_read(struct cirrus_message_pool *pool, 
+       u8 address, 
+       const char* buffer, 
+       size_t length)
+{
+ return NULL;
+}
+
+inline struct spi_message *_cirrus_alloc_write(struct cirrus_message_pool *pool,
+       u8 address, 
+       unsigned char* buffer, 
+       unsigned int length)
+{
+ return NULL;
+}
+
+inline void _cirrus_free(struct cirrus_message_pool *pool, 
+    struct spi_message* message)
+{
+}
+
+inline struct cirrus_message_pool *_cirrus_create_pool(const char* name, 
+       size_t pool_size, 
+       size_t max_message_size)
+{
+ return NULL;
+}
+
+inline void _cirrus_release_pool(struct cirrus_message_pool *pool)
+{
+}
+
+inline ssize_t _cirrus_read_sync(struct device *dev, u8 address, 
+     const char *buffer, size_t length)
+{
+ u8 map_buffer[] = { WRITE_CMD, TO_MAP(address) };
+ u8 read_cmd_buffer[] = { READ_CMD };
+ struct spi_transfer transfers[3];
+ struct spi_message message;
+ 
+ transfers[0].tx_buf = map_buffer;
+ transfers[0].rx_buf = NULL;
+ transfers[0].len = ARRAY_SIZE(map_buffer);
+ transfers[0].cs_change = 0;
+ transfers[0].delay_usecs = 0;
+
+ transfers[1].tx_buf = read_cmd_buffer;
+ transfers[1].rx_buf = NULL;
+ transfers[1].len = ARRAY_SIZE(read_cmd_buffer);
+ transfers[1].cs_change = 1;
+ transfers[1].delay_usecs = 0;
+ 
+ transfers[2].tx_buf = NULL;
+ transfers[2].rx_buf = (void *)buffer;
+ transfers[2].len = length;
+ transfers[2].cs_change = 0;
+ transfers[2].delay_usecs = 0;
+
+ message.transfers = transfers;
+ message.n_transfer = ARRAY_SIZE(transfers);
+
+ spi_sync(to_spi_device(dev), &message);
+ 
+ return message.status < 0 ? message.status : message.actual_length;
+}
+
+inline int _cirrus_write_sync(struct device *dev, u8 address, 
+    const unsigned char *buffer, 
+    unsigned int length)
+{
+ u8 map_buffer[] = { WRITE_CMD, TO_MAP(address) };
+ struct spi_transfer transfers[2];
+ struct spi_message message;
+ 
+ transfers[0].tx_buf = map_buffer,
+ transfers[0].rx_buf = NULL;
+ transfers[0].len = ARRAY_SIZE(map_buffer),
+ transfers[0].cs_change = 1;
+ transfers[0].delay_usecs = 0;
+ 
+ transfers[1].tx_buf = (unsigned char *)buffer,
+ transfers[1].rx_buf = NULL;
+ transfers[1].len = length,
+ transfers[1].cs_change = 0;
+ transfers[1].delay_usecs = 0;
+
+ message.transfers = transfers;
+ message.n_transfer = ARRAY_SIZE(transfers);
+
+ spi_sync(to_spi_device(dev), &message);
+ 
+ return message.status < 0 ? message.status : message.actual_length;
+}
+
+inline int _cirrus_read_register_sync(struct device* dev, u8 address)
+{
+ u8 map_buffer[] = { WRITE_CMD, TO_MAP(address) };
+ u8 read_buffer[] = { READ_CMD, 0 };
+ struct spi_transfer transfers[2];
+ struct spi_message message;
+ int status;
+ 
+ transfers[0].tx_buf = map_buffer,
+ transfers[0].rx_buf = NULL;
+ transfers[0].len = ARRAY_SIZE(map_buffer),
+ transfers[0].cs_change = 1;
+ transfers[0].delay_usecs = 0;
+
+ transfers[1].tx_buf = read_buffer,
+ transfers[1].rx_buf = read_buffer,
+ transfers[1].len = ARRAY_SIZE(read_buffer),
+ transfers[1].cs_change = 0;
+ transfers[1].delay_usecs = 0;
+
+ message.transfers = transfers;
+ message.n_transfer = ARRAY_SIZE(transfers);
+ 
+ status = spi_sync(to_spi_device(dev), &message);
+ if (status < 0)
+  return status;
+ 
+ return message.status < 0 ? message.status : read_buffer[1];
+}
+
+inline int _cirrus_write_register_sync(struct device* dev, u8 address, u8 data)
+{
+ u8 write_buffer[] = { WRITE_CMD, TO_MAP(address), data };
+ struct spi_transfer transfers[1];
+ struct spi_message message;
+
+ transfers[0].tx_buf = write_buffer,
+ transfers[0].rx_buf = NULL;
+ transfers[0].len = ARRAY_SIZE(write_buffer),
+ transfers[0].cs_change = 0;
+ transfers[0].delay_usecs = 0;
+
+ message.transfers = transfers;
+ message.n_transfer = ARRAY_SIZE(transfers);
+ 
+ spi_sync(to_spi_device(dev), &message);
+ 
+ return message.status;
+}
+
+#endif /*CIRRUS_H_*/

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