Merge remote-tracking branch 'spi/topic/sh-msiof' into spi-next

This commit is contained in:
Mark Brown 2015-02-08 11:16:43 +08:00
commit 81306d53da
3 changed files with 84 additions and 25 deletions

View File

@ -30,6 +30,22 @@ Optional properties:
specifiers, one for transmission, and one for
reception.
- dma-names : Must contain a list of two DMA names, "tx" and "rx".
- renesas,dtdl : delay sync signal (setup) in transmit mode.
Must contain one of the following values:
0 (no bit delay)
50 (0.5-clock-cycle delay)
100 (1-clock-cycle delay)
150 (1.5-clock-cycle delay)
200 (2-clock-cycle delay)
- renesas,syncdl : delay sync signal (hold) in transmit mode.
Must contain one of the following values:
0 (no bit delay)
50 (0.5-clock-cycle delay)
100 (1-clock-cycle delay)
150 (1.5-clock-cycle delay)
200 (2-clock-cycle delay)
300 (3-clock-cycle delay)
Optional properties, deprecated for soctype-specific bindings:
- renesas,tx-fifo-size : Overrides the default tx fifo size given in words

View File

@ -82,6 +82,8 @@ struct sh_msiof_spi_priv {
#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_DTDL_SHIFT 20 /* Data Pin Bit Delay for MSIOF_SYNC */
#define MDR1_SYNCDL_SHIFT 16 /* Frame Sync Signal Timing Delay */
#define MDR1_FLD_MASK 0x0000000c /* Frame Sync Signal Interval (0-3) */
#define MDR1_FLD_SHIFT 2
#define MDR1_XXSTP 0x00000001 /* Transmission/Reception Stop on FIFO */
@ -241,42 +243,80 @@ static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
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 },
unsigned short brdv;
} const sh_msiof_spi_div_table[] = {
{ 1, SCR_BRDV_DIV_1 },
{ 2, SCR_BRDV_DIV_2 },
{ 4, SCR_BRDV_DIV_4 },
{ 8, SCR_BRDV_DIV_8 },
{ 16, SCR_BRDV_DIV_16 },
{ 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;
u32 brps, scr;
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)
for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_div_table); k++) {
brps = DIV_ROUND_UP(div, sh_msiof_spi_div_table[k].div);
if (brps <= 32) /* max of brdv is 32 */
break;
}
k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_div_table) - 1);
sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
scr = sh_msiof_spi_div_table[k].brdv | SCR_BRPS(brps);
sh_msiof_write(p, TSCR, scr);
if (!(p->chipdata->master_flags & SPI_MASTER_MUST_TX))
sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
sh_msiof_write(p, RSCR, scr);
}
static u32 sh_msiof_get_delay_bit(u32 dtdl_or_syncdl)
{
/*
* DTDL/SYNCDL bit : p->info->dtdl or p->info->syncdl
* b'000 : 0
* b'001 : 100
* b'010 : 200
* b'011 (SYNCDL only) : 300
* b'101 : 50
* b'110 : 150
*/
if (dtdl_or_syncdl % 100)
return dtdl_or_syncdl / 100 + 5;
else
return dtdl_or_syncdl / 100;
}
static u32 sh_msiof_spi_get_dtdl_and_syncdl(struct sh_msiof_spi_priv *p)
{
u32 val;
if (!p->info)
return 0;
/* check if DTDL and SYNCDL is allowed value */
if (p->info->dtdl > 200 || p->info->syncdl > 300) {
dev_warn(&p->pdev->dev, "DTDL or SYNCDL is too large\n");
return 0;
}
/* check if the sum of DTDL and SYNCDL becomes an integer value */
if ((p->info->dtdl + p->info->syncdl) % 100) {
dev_warn(&p->pdev->dev, "the sum of DTDL/SYNCDL is not good\n");
return 0;
}
val = sh_msiof_get_delay_bit(p->info->dtdl) << MDR1_DTDL_SHIFT;
val |= sh_msiof_get_delay_bit(p->info->syncdl) << MDR1_SYNCDL_SHIFT;
return val;
}
static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
@ -296,6 +336,7 @@ static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
tmp |= lsb_first << MDR1_BITLSB_SHIFT;
tmp |= sh_msiof_spi_get_dtdl_and_syncdl(p);
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 */
@ -501,7 +542,7 @@ static int sh_msiof_spi_setup(struct spi_device *spi)
gpio_set_value(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
pm_runtime_put_sync(&p->pdev->dev);
pm_runtime_put(&p->pdev->dev);
return 0;
}
@ -595,8 +636,7 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
}
/* wait for tx fifo to be emptied / rx fifo to be filled */
ret = wait_for_completion_timeout(&p->done, HZ);
if (!ret) {
if (!wait_for_completion_timeout(&p->done, HZ)) {
dev_err(&p->pdev->dev, "PIO timeout\n");
ret = -ETIMEDOUT;
goto stop_reset;
@ -706,8 +746,7 @@ static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
}
/* wait for tx fifo to be emptied / rx fifo to be filled */
ret = wait_for_completion_timeout(&p->done, HZ);
if (!ret) {
if (!wait_for_completion_timeout(&p->done, HZ)) {
dev_err(&p->pdev->dev, "DMA timeout\n");
ret = -ETIMEDOUT;
goto stop_reset;
@ -957,6 +996,8 @@ static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
&info->tx_fifo_override);
of_property_read_u32(np, "renesas,rx-fifo-size",
&info->rx_fifo_override);
of_property_read_u32(np, "renesas,dtdl", &info->dtdl);
of_property_read_u32(np, "renesas,syncdl", &info->syncdl);
info->num_chipselect = num_cs;

View File

@ -7,6 +7,8 @@ struct sh_msiof_spi_info {
u16 num_chipselect;
unsigned int dma_tx_id;
unsigned int dma_rx_id;
u32 dtdl;
u32 syncdl;
};
#endif /* __SPI_SH_MSIOF_H__ */