mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
3821a065f5
An spi_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Andrew F. Davis <afd@ti.com> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
/*
|
|
* rt5677-spi.c -- RT5677 ALSA SoC audio codec driver
|
|
*
|
|
* Copyright 2013 Realtek Semiconductor Corp.
|
|
* Author: Oder Chiou <oder_chiou@realtek.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/input.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/pm_qos.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/firmware.h>
|
|
|
|
#include "rt5677-spi.h"
|
|
|
|
#define RT5677_SPI_BURST_LEN 240
|
|
#define RT5677_SPI_HEADER 5
|
|
#define RT5677_SPI_FREQ 6000000
|
|
|
|
/* The AddressPhase and DataPhase of SPI commands are MSB first on the wire.
|
|
* DataPhase word size of 16-bit commands is 2 bytes.
|
|
* DataPhase word size of 32-bit commands is 4 bytes.
|
|
* DataPhase word size of burst commands is 8 bytes.
|
|
* The DSP CPU is little-endian.
|
|
*/
|
|
#define RT5677_SPI_WRITE_BURST 0x5
|
|
#define RT5677_SPI_READ_BURST 0x4
|
|
#define RT5677_SPI_WRITE_32 0x3
|
|
#define RT5677_SPI_READ_32 0x2
|
|
#define RT5677_SPI_WRITE_16 0x1
|
|
#define RT5677_SPI_READ_16 0x0
|
|
|
|
static struct spi_device *g_spi;
|
|
static DEFINE_MUTEX(spi_mutex);
|
|
|
|
/* Select a suitable transfer command for the next transfer to ensure
|
|
* the transfer address is always naturally aligned while minimizing
|
|
* the total number of transfers required.
|
|
*
|
|
* 3 transfer commands are available:
|
|
* RT5677_SPI_READ/WRITE_16: Transfer 2 bytes
|
|
* RT5677_SPI_READ/WRITE_32: Transfer 4 bytes
|
|
* RT5677_SPI_READ/WRITE_BURST: Transfer any multiples of 8 bytes
|
|
*
|
|
* For example, reading 260 bytes at 0x60030002 uses the following commands:
|
|
* 0x60030002 RT5677_SPI_READ_16 2 bytes
|
|
* 0x60030004 RT5677_SPI_READ_32 4 bytes
|
|
* 0x60030008 RT5677_SPI_READ_BURST 240 bytes
|
|
* 0x600300F8 RT5677_SPI_READ_BURST 8 bytes
|
|
* 0x60030100 RT5677_SPI_READ_32 4 bytes
|
|
* 0x60030104 RT5677_SPI_READ_16 2 bytes
|
|
*
|
|
* Input:
|
|
* @read: true for read commands; false for write commands
|
|
* @align: alignment of the next transfer address
|
|
* @remain: number of bytes remaining to transfer
|
|
*
|
|
* Output:
|
|
* @len: number of bytes to transfer with the selected command
|
|
* Returns the selected command
|
|
*/
|
|
static u8 rt5677_spi_select_cmd(bool read, u32 align, u32 remain, u32 *len)
|
|
{
|
|
u8 cmd;
|
|
|
|
if (align == 2 || align == 6 || remain == 2) {
|
|
cmd = RT5677_SPI_READ_16;
|
|
*len = 2;
|
|
} else if (align == 4 || remain <= 6) {
|
|
cmd = RT5677_SPI_READ_32;
|
|
*len = 4;
|
|
} else {
|
|
cmd = RT5677_SPI_READ_BURST;
|
|
*len = min_t(u32, remain & ~7, RT5677_SPI_BURST_LEN);
|
|
}
|
|
return read ? cmd : cmd + 1;
|
|
}
|
|
|
|
/* Copy dstlen bytes from src to dst, while reversing byte order for each word.
|
|
* If srclen < dstlen, zeros are padded.
|
|
*/
|
|
static void rt5677_spi_reverse(u8 *dst, u32 dstlen, const u8 *src, u32 srclen)
|
|
{
|
|
u32 w, i, si;
|
|
u32 word_size = min_t(u32, dstlen, 8);
|
|
|
|
for (w = 0; w < dstlen; w += word_size) {
|
|
for (i = 0; i < word_size; i++) {
|
|
si = w + word_size - i - 1;
|
|
dst[w + i] = si < srclen ? src[si] : 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Read DSP address space using SPI. addr and len have to be 2-byte aligned. */
|
|
int rt5677_spi_read(u32 addr, void *rxbuf, size_t len)
|
|
{
|
|
u32 offset;
|
|
int status = 0;
|
|
struct spi_transfer t[2];
|
|
struct spi_message m;
|
|
/* +4 bytes is for the DummyPhase following the AddressPhase */
|
|
u8 header[RT5677_SPI_HEADER + 4];
|
|
u8 body[RT5677_SPI_BURST_LEN];
|
|
u8 spi_cmd;
|
|
u8 *cb = rxbuf;
|
|
|
|
if (!g_spi)
|
|
return -ENODEV;
|
|
|
|
if ((addr & 1) || (len & 1)) {
|
|
dev_err(&g_spi->dev, "Bad read align 0x%x(%zu)\n", addr, len);
|
|
return -EACCES;
|
|
}
|
|
|
|
memset(t, 0, sizeof(t));
|
|
t[0].tx_buf = header;
|
|
t[0].len = sizeof(header);
|
|
t[0].speed_hz = RT5677_SPI_FREQ;
|
|
t[1].rx_buf = body;
|
|
t[1].speed_hz = RT5677_SPI_FREQ;
|
|
spi_message_init_with_transfers(&m, t, ARRAY_SIZE(t));
|
|
|
|
for (offset = 0; offset < len; offset += t[1].len) {
|
|
spi_cmd = rt5677_spi_select_cmd(true, (addr + offset) & 7,
|
|
len - offset, &t[1].len);
|
|
|
|
/* Construct SPI message header */
|
|
header[0] = spi_cmd;
|
|
header[1] = ((addr + offset) & 0xff000000) >> 24;
|
|
header[2] = ((addr + offset) & 0x00ff0000) >> 16;
|
|
header[3] = ((addr + offset) & 0x0000ff00) >> 8;
|
|
header[4] = ((addr + offset) & 0x000000ff) >> 0;
|
|
|
|
mutex_lock(&spi_mutex);
|
|
status |= spi_sync(g_spi, &m);
|
|
mutex_unlock(&spi_mutex);
|
|
|
|
/* Copy data back to caller buffer */
|
|
rt5677_spi_reverse(cb + offset, t[1].len, body, t[1].len);
|
|
}
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt5677_spi_read);
|
|
|
|
/* Write DSP address space using SPI. addr has to be 2-byte aligned.
|
|
* If len is not 2-byte aligned, an extra byte of zero is written at the end
|
|
* as padding.
|
|
*/
|
|
int rt5677_spi_write(u32 addr, const void *txbuf, size_t len)
|
|
{
|
|
u32 offset, len_with_pad = len;
|
|
int status = 0;
|
|
struct spi_transfer t;
|
|
struct spi_message m;
|
|
/* +1 byte is for the DummyPhase following the DataPhase */
|
|
u8 buf[RT5677_SPI_HEADER + RT5677_SPI_BURST_LEN + 1];
|
|
u8 *body = buf + RT5677_SPI_HEADER;
|
|
u8 spi_cmd;
|
|
const u8 *cb = txbuf;
|
|
|
|
if (!g_spi)
|
|
return -ENODEV;
|
|
|
|
if (addr & 1) {
|
|
dev_err(&g_spi->dev, "Bad write align 0x%x(%zu)\n", addr, len);
|
|
return -EACCES;
|
|
}
|
|
|
|
if (len & 1)
|
|
len_with_pad = len + 1;
|
|
|
|
memset(&t, 0, sizeof(t));
|
|
t.tx_buf = buf;
|
|
t.speed_hz = RT5677_SPI_FREQ;
|
|
spi_message_init_with_transfers(&m, &t, 1);
|
|
|
|
for (offset = 0; offset < len_with_pad;) {
|
|
spi_cmd = rt5677_spi_select_cmd(false, (addr + offset) & 7,
|
|
len_with_pad - offset, &t.len);
|
|
|
|
/* Construct SPI message header */
|
|
buf[0] = spi_cmd;
|
|
buf[1] = ((addr + offset) & 0xff000000) >> 24;
|
|
buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
|
|
buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
|
|
buf[4] = ((addr + offset) & 0x000000ff) >> 0;
|
|
|
|
/* Fetch data from caller buffer */
|
|
rt5677_spi_reverse(body, t.len, cb + offset, len - offset);
|
|
offset += t.len;
|
|
t.len += RT5677_SPI_HEADER + 1;
|
|
|
|
mutex_lock(&spi_mutex);
|
|
status |= spi_sync(g_spi, &m);
|
|
mutex_unlock(&spi_mutex);
|
|
}
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt5677_spi_write);
|
|
|
|
int rt5677_spi_write_firmware(u32 addr, const struct firmware *fw)
|
|
{
|
|
return rt5677_spi_write(addr, fw->data, fw->size);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt5677_spi_write_firmware);
|
|
|
|
static int rt5677_spi_probe(struct spi_device *spi)
|
|
{
|
|
g_spi = spi;
|
|
return 0;
|
|
}
|
|
|
|
static struct spi_driver rt5677_spi_driver = {
|
|
.driver = {
|
|
.name = "rt5677",
|
|
},
|
|
.probe = rt5677_spi_probe,
|
|
};
|
|
module_spi_driver(rt5677_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("ASoC RT5677 SPI driver");
|
|
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
|
|
MODULE_LICENSE("GPL v2");
|