/**
* gpmi_set_timings - set GPMI timings
* @pdev: pointer to GPMI platform device
* @tm: pointer to structure &gpmi_nand_timing with new timings
*
* During initialization, GPMI uses safe sub-optimal timings, which
* can be changed after reading boot control blocks
*/
void gpmi_set_timings(struct lba_data *data, struct gpmi_nand_timing *tm)
{
u32 period_ns = 1000000 / clk_get_rate(data->clk) + 1;
u32 address_cycles, data_setup_cycles;
u32 data_hold_cycles, data_sample_cycles;
u32 busy_timeout;
u32 t0;
address_cycles = gpmi_cycles_ceil(tm->address_setup, period_ns);
data_setup_cycles = gpmi_cycles_ceil(tm->data_setup, period_ns);
data_hold_cycles = gpmi_cycles_ceil(tm->data_hold, period_ns);
data_sample_cycles = gpmi_cycles_ceil(tm->dsample_time + period_ns / 4,
period_ns / 2);
busy_timeout = gpmi_cycles_ceil(10000000 / 4096, period_ns);
t0 = BF_GPMI_TIMING0_ADDRESS_SETUP(address_cycles) |
BF_GPMI_TIMING0_DATA_SETUP(data_setup_cycles) |
BF_GPMI_TIMING0_DATA_HOLD(data_hold_cycles);
HW_GPMI_TIMING0_WR(t0);
HW_GPMI_TIMING1_WR(BF_GPMI_TIMING1_DEVICE_BUSY_TIMEOUT(busy_timeout));
#ifdef CONFIG_ARCH_STMP378X
HW_GPMI_CTRL1_CLR(BM_GPMI_CTRL1_RDN_DELAY);
HW_GPMI_CTRL1_SET(BF_GPMI_CTRL1_RDN_DELAY(data_sample_cycles));
#else
HW_GPMI_CTRL1_CLR(BM_GPMI_CTRL1_DSAMPLE_TIME);
HW_GPMI_CTRL1_SET(BF_GPMI_CTRL1_DSAMPLE_TIME(data_sample_cycles));
#endif
}
void queue_plug(struct lba_data *data)
{
clk_enable(data->clk);
if (clk <= 0)
clk = 24000; /* safe setting, some chips do not work on
speeds >= 24kHz */
clk_set_rate(data->clk, clk);
clk = clk_get_rate(data->clk);
stmp3xxx_reset_block(HW_GPMI_CTRL0_OFFSET + REGS_GPMI_BASE, 1);
/* write protection OFF */
HW_GPMI_CTRL1_SET(BM_GPMI_CTRL1_DEV_RESET);
/* IRQ polarity */
HW_GPMI_CTRL1_SET(BM_GPMI_CTRL1_ATA_IRQRDY_POLARITY);
/* ...and ECC module */
/*HW_GPMI_CTRL1_SET(bch_mode());*/
/* choose NAND mode (1 means ATA, 0 - NAND */
HW_GPMI_CTRL1_CLR(BM_GPMI_CTRL1_GPMI_MODE);
gpmi_set_timings(data, &gpmi_safe_timing);
}
void gpmi_enable_writes(bool bClearOrSet)
{
if (bClearOrSet)
{
HW_GPMI_CTRL1_SET(BM_GPMI_CTRL1_DEV_RESET);
}
else
{
HW_GPMI_CTRL1_CLR(BM_GPMI_CTRL1_DEV_RESET);
}
}
/**
* gpmi_irq - IRQ handler
*
* @irq: irq no
* @context: IRQ context, pointer to gpmi_nand_data
*/
static irqreturn_t gpmi_irq(int irq, void *context)
{
struct lba_data *data = context;
int i;
for (i = 0; i < max_chips; i++) {
if (stmp3xxx_dma_is_interrupt(data->nand[i].dma_ch)) {
stmp3xxx_dma_clear_interrupt(data->nand[i].dma_ch);
complete(&data->nand[i].done);
}
}
HW_GPMI_CTRL1_CLR(BM_GPMI_CTRL1_DEV_IRQ | BM_GPMI_CTRL1_TIMEOUT_IRQ);
return IRQ_HANDLED;
}