801 lines
21 KiB
C
801 lines
21 KiB
C
/*
|
|
* SuperH MSIOF SPI Master Interface
|
|
*
|
|
* Copyright (c) 2009 Magnus Damm
|
|
*
|
|
* 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/bitmap.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
|
|
#include <linux/spi/sh_msiof.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#include <asm/unaligned.h>
|
|
|
|
|
|
struct sh_msiof_chipdata {
|
|
u16 tx_fifo_size;
|
|
u16 rx_fifo_size;
|
|
u16 master_flags;
|
|
};
|
|
|
|
struct sh_msiof_spi_priv {
|
|
void __iomem *mapbase;
|
|
struct clk *clk;
|
|
struct platform_device *pdev;
|
|
const struct sh_msiof_chipdata *chipdata;
|
|
struct sh_msiof_spi_info *info;
|
|
struct completion done;
|
|
int tx_fifo_size;
|
|
int rx_fifo_size;
|
|
};
|
|
|
|
#define TMDR1 0x00 /* Transmit Mode Register 1 */
|
|
#define TMDR2 0x04 /* Transmit Mode Register 2 */
|
|
#define TMDR3 0x08 /* Transmit Mode Register 3 */
|
|
#define RMDR1 0x10 /* Receive Mode Register 1 */
|
|
#define RMDR2 0x14 /* Receive Mode Register 2 */
|
|
#define RMDR3 0x18 /* Receive Mode Register 3 */
|
|
#define TSCR 0x20 /* Transmit Clock Select Register */
|
|
#define RSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */
|
|
#define CTR 0x28 /* Control Register */
|
|
#define FCTR 0x30 /* FIFO Control Register */
|
|
#define STR 0x40 /* Status Register */
|
|
#define IER 0x44 /* Interrupt Enable Register */
|
|
#define TDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */
|
|
#define TDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */
|
|
#define TFDR 0x50 /* Transmit FIFO Data Register */
|
|
#define RDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */
|
|
#define RDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */
|
|
#define RFDR 0x60 /* Receive FIFO Data Register */
|
|
|
|
/* TMDR1 and RMDR1 */
|
|
#define MDR1_TRMD 0x80000000 /* Transfer Mode (1 = Master mode) */
|
|
#define MDR1_SYNCMD_MASK 0x30000000 /* SYNC Mode */
|
|
#define MDR1_SYNCMD_SPI 0x20000000 /* Level mode/SPI */
|
|
#define MDR1_SYNCMD_LR 0x30000000 /* L/R mode */
|
|
#define MDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */
|
|
#define MDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */
|
|
#define MDR1_FLD_MASK 0x000000c0 /* Frame Sync Signal Interval (0-3) */
|
|
#define MDR1_FLD_SHIFT 2
|
|
#define MDR1_XXSTP 0x00000001 /* Transmission/Reception Stop on FIFO */
|
|
/* TMDR1 */
|
|
#define TMDR1_PCON 0x40000000 /* Transfer Signal Connection */
|
|
|
|
/* TMDR2 and RMDR2 */
|
|
#define MDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */
|
|
#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
|
|
#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
|
|
|
|
/* TSCR and RSCR */
|
|
#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
|
|
#define SCR_BRPS(i) (((i) - 1) << 8)
|
|
#define SCR_BRDV_MASK 0x0007 /* Baud Rate Generator's Division Ratio */
|
|
#define SCR_BRDV_DIV_2 0x0000
|
|
#define SCR_BRDV_DIV_4 0x0001
|
|
#define SCR_BRDV_DIV_8 0x0002
|
|
#define SCR_BRDV_DIV_16 0x0003
|
|
#define SCR_BRDV_DIV_32 0x0004
|
|
#define SCR_BRDV_DIV_1 0x0007
|
|
|
|
/* CTR */
|
|
#define CTR_TSCKIZ_MASK 0xc0000000 /* Transmit Clock I/O Polarity Select */
|
|
#define CTR_TSCKIZ_SCK 0x80000000 /* Disable SCK when TX disabled */
|
|
#define CTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */
|
|
#define CTR_RSCKIZ_MASK 0x30000000 /* Receive Clock Polarity Select */
|
|
#define CTR_RSCKIZ_SCK 0x20000000 /* Must match CTR_TSCKIZ_SCK */
|
|
#define CTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */
|
|
#define CTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */
|
|
#define CTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */
|
|
#define CTR_TXDIZ_MASK 0x00c00000 /* Pin Output When TX is Disabled */
|
|
#define CTR_TXDIZ_LOW 0x00000000 /* 0 */
|
|
#define CTR_TXDIZ_HIGH 0x00400000 /* 1 */
|
|
#define CTR_TXDIZ_HIZ 0x00800000 /* High-impedance */
|
|
#define CTR_TSCKE 0x00008000 /* Transmit Serial Clock Output Enable */
|
|
#define CTR_TFSE 0x00004000 /* Transmit Frame Sync Signal Output Enable */
|
|
#define CTR_TXE 0x00000200 /* Transmit Enable */
|
|
#define CTR_RXE 0x00000100 /* Receive Enable */
|
|
|
|
/* STR and IER */
|
|
#define STR_TEOF 0x00800000 /* Frame Transmission End */
|
|
#define STR_REOF 0x00000080 /* Frame Reception End */
|
|
|
|
|
|
static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
|
|
{
|
|
switch (reg_offs) {
|
|
case TSCR:
|
|
case RSCR:
|
|
return ioread16(p->mapbase + reg_offs);
|
|
default:
|
|
return ioread32(p->mapbase + reg_offs);
|
|
}
|
|
}
|
|
|
|
static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
|
|
u32 value)
|
|
{
|
|
switch (reg_offs) {
|
|
case TSCR:
|
|
case RSCR:
|
|
iowrite16(value, p->mapbase + reg_offs);
|
|
break;
|
|
default:
|
|
iowrite32(value, p->mapbase + reg_offs);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
|
|
u32 clr, u32 set)
|
|
{
|
|
u32 mask = clr | set;
|
|
u32 data;
|
|
int k;
|
|
|
|
data = sh_msiof_read(p, CTR);
|
|
data &= ~clr;
|
|
data |= set;
|
|
sh_msiof_write(p, CTR, data);
|
|
|
|
for (k = 100; k > 0; k--) {
|
|
if ((sh_msiof_read(p, CTR) & mask) == set)
|
|
break;
|
|
|
|
udelay(10);
|
|
}
|
|
|
|
return k > 0 ? 0 : -ETIMEDOUT;
|
|
}
|
|
|
|
static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
|
|
{
|
|
struct sh_msiof_spi_priv *p = data;
|
|
|
|
/* just disable the interrupt and wake up */
|
|
sh_msiof_write(p, IER, 0);
|
|
complete(&p->done);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct {
|
|
unsigned short div;
|
|
unsigned short scr;
|
|
} const sh_msiof_spi_clk_table[] = {
|
|
{ 1, SCR_BRPS( 1) | SCR_BRDV_DIV_1 },
|
|
{ 2, SCR_BRPS( 1) | SCR_BRDV_DIV_2 },
|
|
{ 4, SCR_BRPS( 1) | SCR_BRDV_DIV_4 },
|
|
{ 8, SCR_BRPS( 1) | SCR_BRDV_DIV_8 },
|
|
{ 16, SCR_BRPS( 1) | SCR_BRDV_DIV_16 },
|
|
{ 32, SCR_BRPS( 1) | SCR_BRDV_DIV_32 },
|
|
{ 64, SCR_BRPS(32) | SCR_BRDV_DIV_2 },
|
|
{ 128, SCR_BRPS(32) | SCR_BRDV_DIV_4 },
|
|
{ 256, SCR_BRPS(32) | SCR_BRDV_DIV_8 },
|
|
{ 512, SCR_BRPS(32) | SCR_BRDV_DIV_16 },
|
|
{ 1024, SCR_BRPS(32) | SCR_BRDV_DIV_32 },
|
|
};
|
|
|
|
static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
|
|
unsigned long parent_rate, u32 spi_hz)
|
|
{
|
|
unsigned long div = 1024;
|
|
size_t k;
|
|
|
|
if (!WARN_ON(!spi_hz || !parent_rate))
|
|
div = DIV_ROUND_UP(parent_rate, spi_hz);
|
|
|
|
/* TODO: make more fine grained */
|
|
|
|
for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) {
|
|
if (sh_msiof_spi_clk_table[k].div >= div)
|
|
break;
|
|
}
|
|
|
|
k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
|
|
|
|
sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
|
|
if (!(p->chipdata->master_flags & SPI_MASTER_MUST_TX))
|
|
sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
|
|
}
|
|
|
|
static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
|
|
u32 cpol, u32 cpha,
|
|
u32 tx_hi_z, u32 lsb_first, u32 cs_high)
|
|
{
|
|
u32 tmp;
|
|
int edge;
|
|
|
|
/*
|
|
* CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
|
|
* 0 0 10 10 1 1
|
|
* 0 1 10 10 0 0
|
|
* 1 0 11 11 0 0
|
|
* 1 1 11 11 1 1
|
|
*/
|
|
sh_msiof_write(p, FCTR, 0);
|
|
|
|
tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
|
|
tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
|
|
tmp |= lsb_first << MDR1_BITLSB_SHIFT;
|
|
sh_msiof_write(p, TMDR1, tmp | MDR1_TRMD | TMDR1_PCON);
|
|
if (p->chipdata->master_flags & SPI_MASTER_MUST_TX) {
|
|
/* These bits are reserved if RX needs TX */
|
|
tmp &= ~0x0000ffff;
|
|
}
|
|
sh_msiof_write(p, RMDR1, tmp);
|
|
|
|
tmp = 0;
|
|
tmp |= CTR_TSCKIZ_SCK | cpol << CTR_TSCKIZ_POL_SHIFT;
|
|
tmp |= CTR_RSCKIZ_SCK | cpol << CTR_RSCKIZ_POL_SHIFT;
|
|
|
|
edge = cpol ^ !cpha;
|
|
|
|
tmp |= edge << CTR_TEDG_SHIFT;
|
|
tmp |= edge << CTR_REDG_SHIFT;
|
|
tmp |= tx_hi_z ? CTR_TXDIZ_HIZ : CTR_TXDIZ_LOW;
|
|
sh_msiof_write(p, CTR, tmp);
|
|
}
|
|
|
|
static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, void *rx_buf,
|
|
u32 bits, u32 words)
|
|
{
|
|
u32 dr2 = MDR2_BITLEN1(bits) | MDR2_WDLEN1(words);
|
|
|
|
if (tx_buf || (p->chipdata->master_flags & SPI_MASTER_MUST_TX))
|
|
sh_msiof_write(p, TMDR2, dr2);
|
|
else
|
|
sh_msiof_write(p, TMDR2, dr2 | MDR2_GRPMASK1);
|
|
|
|
if (rx_buf)
|
|
sh_msiof_write(p, RMDR2, dr2);
|
|
|
|
sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
|
|
}
|
|
|
|
static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
|
|
{
|
|
sh_msiof_write(p, STR, sh_msiof_read(p, STR));
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u8 *buf_8 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, buf_8[k] << fs);
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u16 *buf_16 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, buf_16[k] << fs);
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u16 *buf_16 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u32 *buf_32 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, buf_32[k] << fs);
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u32 *buf_32 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u32 *buf_32 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
|
|
}
|
|
|
|
static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
|
|
const void *tx_buf, int words, int fs)
|
|
{
|
|
const u32 *buf_32 = tx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u8 *buf_8 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u16 *buf_16 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u16 *buf_16 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u32 *buf_32 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u32 *buf_32 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u32 *buf_32 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
|
|
}
|
|
|
|
static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
|
|
void *rx_buf, int words, int fs)
|
|
{
|
|
u32 *buf_32 = rx_buf;
|
|
int k;
|
|
|
|
for (k = 0; k < words; k++)
|
|
put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
|
|
}
|
|
|
|
static int sh_msiof_spi_setup(struct spi_device *spi)
|
|
{
|
|
struct device_node *np = spi->master->dev.of_node;
|
|
struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
|
|
|
|
if (!np) {
|
|
/*
|
|
* Use spi->controller_data for CS (same strategy as spi_gpio),
|
|
* if any. otherwise let HW control CS
|
|
*/
|
|
spi->cs_gpio = (uintptr_t)spi->controller_data;
|
|
}
|
|
|
|
/* Configure pins before deasserting CS */
|
|
sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
|
|
!!(spi->mode & SPI_CPHA),
|
|
!!(spi->mode & SPI_3WIRE),
|
|
!!(spi->mode & SPI_LSB_FIRST),
|
|
!!(spi->mode & SPI_CS_HIGH));
|
|
|
|
if (spi->cs_gpio >= 0)
|
|
gpio_set_value(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sh_msiof_prepare_message(struct spi_master *master,
|
|
struct spi_message *msg)
|
|
{
|
|
struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
|
|
const struct spi_device *spi = msg->spi;
|
|
|
|
/* Configure pins before asserting CS */
|
|
sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
|
|
!!(spi->mode & SPI_CPHA),
|
|
!!(spi->mode & SPI_3WIRE),
|
|
!!(spi->mode & SPI_LSB_FIRST),
|
|
!!(spi->mode & SPI_CS_HIGH));
|
|
return 0;
|
|
}
|
|
|
|
static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
|
|
void (*tx_fifo)(struct sh_msiof_spi_priv *,
|
|
const void *, int, int),
|
|
void (*rx_fifo)(struct sh_msiof_spi_priv *,
|
|
void *, int, int),
|
|
const void *tx_buf, void *rx_buf,
|
|
int words, int bits)
|
|
{
|
|
int fifo_shift;
|
|
int ret;
|
|
|
|
/* limit maximum word transfer to rx/tx fifo size */
|
|
if (tx_buf)
|
|
words = min_t(int, words, p->tx_fifo_size);
|
|
if (rx_buf)
|
|
words = min_t(int, words, p->rx_fifo_size);
|
|
|
|
/* the fifo contents need shifting */
|
|
fifo_shift = 32 - bits;
|
|
|
|
/* setup msiof transfer mode registers */
|
|
sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
|
|
|
|
/* write tx fifo */
|
|
if (tx_buf)
|
|
tx_fifo(p, tx_buf, words, fifo_shift);
|
|
|
|
/* setup clock and rx/tx signals */
|
|
ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
|
|
if (rx_buf)
|
|
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
|
|
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
|
|
|
|
/* start by setting frame bit */
|
|
reinit_completion(&p->done);
|
|
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
|
|
if (ret) {
|
|
dev_err(&p->pdev->dev, "failed to start hardware\n");
|
|
goto err;
|
|
}
|
|
|
|
/* wait for tx fifo to be emptied / rx fifo to be filled */
|
|
wait_for_completion(&p->done);
|
|
|
|
/* read rx fifo */
|
|
if (rx_buf)
|
|
rx_fifo(p, rx_buf, words, fifo_shift);
|
|
|
|
/* clear status bits */
|
|
sh_msiof_reset_str(p);
|
|
|
|
/* shut down frame, rx/tx and clock signals */
|
|
ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
|
|
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
|
|
if (rx_buf)
|
|
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
|
|
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
|
|
if (ret) {
|
|
dev_err(&p->pdev->dev, "failed to shut down hardware\n");
|
|
goto err;
|
|
}
|
|
|
|
return words;
|
|
|
|
err:
|
|
sh_msiof_write(p, IER, 0);
|
|
return ret;
|
|
}
|
|
|
|
static int sh_msiof_transfer_one(struct spi_master *master,
|
|
struct spi_device *spi,
|
|
struct spi_transfer *t)
|
|
{
|
|
struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
|
|
void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
|
|
void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
|
|
int bits;
|
|
int bytes_per_word;
|
|
int bytes_done;
|
|
int words;
|
|
int n;
|
|
bool swab;
|
|
|
|
bits = t->bits_per_word;
|
|
|
|
if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
|
|
bits = 32;
|
|
swab = true;
|
|
} else {
|
|
swab = false;
|
|
}
|
|
|
|
/* setup bytes per word and fifo read/write functions */
|
|
if (bits <= 8) {
|
|
bytes_per_word = 1;
|
|
tx_fifo = sh_msiof_spi_write_fifo_8;
|
|
rx_fifo = sh_msiof_spi_read_fifo_8;
|
|
} else if (bits <= 16) {
|
|
bytes_per_word = 2;
|
|
if ((unsigned long)t->tx_buf & 0x01)
|
|
tx_fifo = sh_msiof_spi_write_fifo_16u;
|
|
else
|
|
tx_fifo = sh_msiof_spi_write_fifo_16;
|
|
|
|
if ((unsigned long)t->rx_buf & 0x01)
|
|
rx_fifo = sh_msiof_spi_read_fifo_16u;
|
|
else
|
|
rx_fifo = sh_msiof_spi_read_fifo_16;
|
|
} else if (swab) {
|
|
bytes_per_word = 4;
|
|
if ((unsigned long)t->tx_buf & 0x03)
|
|
tx_fifo = sh_msiof_spi_write_fifo_s32u;
|
|
else
|
|
tx_fifo = sh_msiof_spi_write_fifo_s32;
|
|
|
|
if ((unsigned long)t->rx_buf & 0x03)
|
|
rx_fifo = sh_msiof_spi_read_fifo_s32u;
|
|
else
|
|
rx_fifo = sh_msiof_spi_read_fifo_s32;
|
|
} else {
|
|
bytes_per_word = 4;
|
|
if ((unsigned long)t->tx_buf & 0x03)
|
|
tx_fifo = sh_msiof_spi_write_fifo_32u;
|
|
else
|
|
tx_fifo = sh_msiof_spi_write_fifo_32;
|
|
|
|
if ((unsigned long)t->rx_buf & 0x03)
|
|
rx_fifo = sh_msiof_spi_read_fifo_32u;
|
|
else
|
|
rx_fifo = sh_msiof_spi_read_fifo_32;
|
|
}
|
|
|
|
/* setup clocks (clock already enabled in chipselect()) */
|
|
sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
|
|
|
|
/* transfer in fifo sized chunks */
|
|
words = t->len / bytes_per_word;
|
|
bytes_done = 0;
|
|
|
|
while (bytes_done < t->len) {
|
|
void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
|
|
const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
|
|
n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
|
|
tx_buf,
|
|
rx_buf,
|
|
words, bits);
|
|
if (n < 0)
|
|
break;
|
|
|
|
bytes_done += n * bytes_per_word;
|
|
words -= n;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct sh_msiof_chipdata sh_data = {
|
|
.tx_fifo_size = 64,
|
|
.rx_fifo_size = 64,
|
|
.master_flags = 0,
|
|
};
|
|
|
|
static const struct sh_msiof_chipdata r8a779x_data = {
|
|
.tx_fifo_size = 64,
|
|
.rx_fifo_size = 256,
|
|
.master_flags = SPI_MASTER_MUST_TX,
|
|
};
|
|
|
|
static const struct of_device_id sh_msiof_match[] = {
|
|
{ .compatible = "renesas,sh-msiof", .data = &sh_data },
|
|
{ .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
|
|
{ .compatible = "renesas,msiof-r8a7790", .data = &r8a779x_data },
|
|
{ .compatible = "renesas,msiof-r8a7791", .data = &r8a779x_data },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sh_msiof_match);
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
|
|
{
|
|
struct sh_msiof_spi_info *info;
|
|
struct device_node *np = dev->of_node;
|
|
u32 num_cs = 1;
|
|
|
|
info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
|
|
if (!info) {
|
|
dev_err(dev, "failed to allocate setup data\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Parse the MSIOF properties */
|
|
of_property_read_u32(np, "num-cs", &num_cs);
|
|
of_property_read_u32(np, "renesas,tx-fifo-size",
|
|
&info->tx_fifo_override);
|
|
of_property_read_u32(np, "renesas,rx-fifo-size",
|
|
&info->rx_fifo_override);
|
|
|
|
info->num_chipselect = num_cs;
|
|
|
|
return info;
|
|
}
|
|
#else
|
|
static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int sh_msiof_spi_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *r;
|
|
struct spi_master *master;
|
|
const struct of_device_id *of_id;
|
|
struct sh_msiof_spi_priv *p;
|
|
int i;
|
|
int ret;
|
|
|
|
master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
|
|
if (master == NULL) {
|
|
dev_err(&pdev->dev, "failed to allocate spi master\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
p = spi_master_get_devdata(master);
|
|
|
|
platform_set_drvdata(pdev, p);
|
|
|
|
of_id = of_match_device(sh_msiof_match, &pdev->dev);
|
|
if (of_id) {
|
|
p->chipdata = of_id->data;
|
|
p->info = sh_msiof_spi_parse_dt(&pdev->dev);
|
|
} else {
|
|
p->chipdata = (const void *)pdev->id_entry->driver_data;
|
|
p->info = dev_get_platdata(&pdev->dev);
|
|
}
|
|
|
|
if (!p->info) {
|
|
dev_err(&pdev->dev, "failed to obtain device info\n");
|
|
ret = -ENXIO;
|
|
goto err1;
|
|
}
|
|
|
|
init_completion(&p->done);
|
|
|
|
p->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(p->clk)) {
|
|
dev_err(&pdev->dev, "cannot get clock\n");
|
|
ret = PTR_ERR(p->clk);
|
|
goto err1;
|
|
}
|
|
|
|
i = platform_get_irq(pdev, 0);
|
|
if (i < 0) {
|
|
dev_err(&pdev->dev, "cannot get platform IRQ\n");
|
|
ret = -ENOENT;
|
|
goto err1;
|
|
}
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
p->mapbase = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(p->mapbase)) {
|
|
ret = PTR_ERR(p->mapbase);
|
|
goto err1;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0,
|
|
dev_name(&pdev->dev), p);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "unable to request irq\n");
|
|
goto err1;
|
|
}
|
|
|
|
p->pdev = pdev;
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
/* Platform data may override FIFO sizes */
|
|
p->tx_fifo_size = p->chipdata->tx_fifo_size;
|
|
p->rx_fifo_size = p->chipdata->rx_fifo_size;
|
|
if (p->info->tx_fifo_override)
|
|
p->tx_fifo_size = p->info->tx_fifo_override;
|
|
if (p->info->rx_fifo_override)
|
|
p->rx_fifo_size = p->info->rx_fifo_override;
|
|
|
|
/* init master code */
|
|
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
|
|
master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
|
|
master->flags = p->chipdata->master_flags;
|
|
master->bus_num = pdev->id;
|
|
master->dev.of_node = pdev->dev.of_node;
|
|
master->num_chipselect = p->info->num_chipselect;
|
|
master->setup = sh_msiof_spi_setup;
|
|
master->prepare_message = sh_msiof_prepare_message;
|
|
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
|
|
master->auto_runtime_pm = true;
|
|
master->transfer_one = sh_msiof_transfer_one;
|
|
|
|
ret = devm_spi_register_master(&pdev->dev, master);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "spi_register_master error.\n");
|
|
goto err2;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err2:
|
|
pm_runtime_disable(&pdev->dev);
|
|
err1:
|
|
spi_master_put(master);
|
|
return ret;
|
|
}
|
|
|
|
static int sh_msiof_spi_remove(struct platform_device *pdev)
|
|
{
|
|
pm_runtime_disable(&pdev->dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_device_id spi_driver_ids[] = {
|
|
{ "spi_sh_msiof", (kernel_ulong_t)&sh_data },
|
|
{ "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
|
|
{ "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, spi_driver_ids);
|
|
|
|
static struct platform_driver sh_msiof_spi_drv = {
|
|
.probe = sh_msiof_spi_probe,
|
|
.remove = sh_msiof_spi_remove,
|
|
.id_table = spi_driver_ids,
|
|
.driver = {
|
|
.name = "spi_sh_msiof",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(sh_msiof_match),
|
|
},
|
|
};
|
|
module_platform_driver(sh_msiof_spi_drv);
|
|
|
|
MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
|
|
MODULE_AUTHOR("Magnus Damm");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:spi_sh_msiof");
|