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ARM: OMAP2+: tusb6010: generic timing calculation
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Generic gpmc timing calculation helper is available now, use
it instead of custom timing calculation.

Signed-off-by: Afzal Mohammed <afzal@ti.com>
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Afzal Mohammed committed Nov 9, 2012
1 parent ac2d9ae commit 47acde1
Showing 1 changed file with 44 additions and 138 deletions.
182 changes: 44 additions & 138 deletions arch/arm/mach-omap2/usb-tusb6010.c
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Original file line number Diff line number Diff line change
Expand Up @@ -27,182 +27,88 @@ static u8 async_cs, sync_cs;
static unsigned refclk_psec;


/* t2_ps, when quantized to fclk units, must happen no earlier than
* the clock after after t1_NS.
*
* Return a possibly updated value of t2_ps, converted to nsec.
*/
static unsigned
next_clk(unsigned t1_NS, unsigned t2_ps, unsigned fclk_ps)
{
unsigned t1_ps = t1_NS * 1000;
unsigned t1_f, t2_f;

if ((t1_ps + fclk_ps) < t2_ps)
return t2_ps / 1000;

t1_f = (t1_ps + fclk_ps - 1) / fclk_ps;
t2_f = (t2_ps + fclk_ps - 1) / fclk_ps;

if (t1_f >= t2_f)
t2_f = t1_f + 1;

return (t2_f * fclk_ps) / 1000;
}

/* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */

static int tusb_set_async_mode(unsigned sysclk_ps, unsigned fclk_ps)
static int tusb_set_async_mode(unsigned sysclk_ps)
{
struct gpmc_device_timings dev_t;
struct gpmc_timings t;
unsigned t_acsnh_advnh = sysclk_ps + 3000;
unsigned tmp;

memset(&t, 0, sizeof(t));

/* CS_ON = t_acsnh_acsnl */
t.cs_on = 8;
/* ADV_ON = t_acsnh_advnh - t_advn */
t.adv_on = next_clk(t.cs_on, t_acsnh_advnh - 7000, fclk_ps);

/*
* READ ... from omap2420 TRM fig 12-13
*/

/* ADV_RD_OFF = t_acsnh_advnh */
t.adv_rd_off = next_clk(t.adv_on, t_acsnh_advnh, fclk_ps);

/* OE_ON = t_acsnh_advnh + t_advn_oen (then wait for nRDY) */
t.oe_on = next_clk(t.adv_on, t_acsnh_advnh + 1000, fclk_ps);

/* ACCESS = counters continue only after nRDY */
tmp = t.oe_on * 1000 + 300;
t.access = next_clk(t.oe_on, tmp, fclk_ps);

/* OE_OFF = after data gets sampled */
tmp = t.access * 1000;
t.oe_off = next_clk(t.access, tmp, fclk_ps);

t.cs_rd_off = t.oe_off;

tmp = t.cs_rd_off * 1000 + 7000 /* t_acsn_rdy_z */;
t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

/*
* WRITE ... from omap2420 TRM fig 12-15
*/

/* ADV_WR_OFF = t_acsnh_advnh */
t.adv_wr_off = t.adv_rd_off;
memset(&dev_t, 0, sizeof(dev_t));

/* WE_ON = t_acsnh_advnh + t_advn_wen (then wait for nRDY) */
t.we_on = next_clk(t.adv_wr_off, t_acsnh_advnh + 1000, fclk_ps);
dev_t.mux = true;

/* WE_OFF = after data gets sampled */
tmp = t.we_on * 1000 + 300;
t.we_off = next_clk(t.we_on, tmp, fclk_ps);
dev_t.t_ceasu = 8 * 1000;
dev_t.t_avdasu = t_acsnh_advnh - 7000;
dev_t.t_ce_avd = 1000;
dev_t.t_avdp_r = t_acsnh_advnh;
dev_t.t_oeasu = t_acsnh_advnh + 1000;
dev_t.t_oe = 300;
dev_t.t_cez_r = 7000;
dev_t.t_cez_w = dev_t.t_cez_r;
dev_t.t_avdp_w = t_acsnh_advnh;
dev_t.t_weasu = t_acsnh_advnh + 1000;
dev_t.t_wpl = 300;
dev_t.cyc_aavdh_we = 1;

t.cs_wr_off = t.we_off;

tmp = t.cs_wr_off * 1000 + 7000 /* t_acsn_rdy_z */;
t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);
gpmc_calc_timings(&t, &dev_t);

return gpmc_cs_set_timings(async_cs, &t);
}

static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
static int tusb_set_sync_mode(unsigned sysclk_ps)
{
struct gpmc_device_timings dev_t;
struct gpmc_timings t;
unsigned t_scsnh_advnh = sysclk_ps + 3000;
unsigned tmp;

memset(&t, 0, sizeof(t));
t.cs_on = 8;

/* ADV_ON = t_acsnh_advnh - t_advn */
t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);

/* GPMC_CLK rate = fclk rate / div */
t.sync_clk = 11100 /* 11.1 nsec */;
tmp = (t.sync_clk + fclk_ps - 1) / fclk_ps;
if (tmp > 4)
return -ERANGE;
if (tmp == 0)
tmp = 1;
t.page_burst_access = (fclk_ps * tmp) / 1000;

/*
* READ ... based on omap2420 TRM fig 12-19, 12-20
*/

/* ADV_RD_OFF = t_scsnh_advnh */
t.adv_rd_off = next_clk(t.adv_on, t_scsnh_advnh, fclk_ps);

/* OE_ON = t_scsnh_advnh + t_advn_oen * fclk_ps (then wait for nRDY) */
tmp = (t.adv_rd_off * 1000) + (3 * fclk_ps);
t.oe_on = next_clk(t.adv_on, tmp, fclk_ps);

/* ACCESS = number of clock cycles after t_adv_eon */
tmp = (t.oe_on * 1000) + (5 * fclk_ps);
t.access = next_clk(t.oe_on, tmp, fclk_ps);

/* OE_OFF = after data gets sampled */
tmp = (t.access * 1000) + (1 * fclk_ps);
t.oe_off = next_clk(t.access, tmp, fclk_ps);

t.cs_rd_off = t.oe_off;

tmp = t.cs_rd_off * 1000 + 7000 /* t_scsn_rdy_z */;
t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

/*
* WRITE ... based on omap2420 TRM fig 12-21
*/

/* ADV_WR_OFF = t_scsnh_advnh */
t.adv_wr_off = t.adv_rd_off;

/* WE_ON = t_scsnh_advnh + t_advn_wen * fclk_ps (then wait for nRDY) */
tmp = (t.adv_wr_off * 1000) + (3 * fclk_ps);
t.we_on = next_clk(t.adv_wr_off, tmp, fclk_ps);

/* WE_OFF = number of clock cycles after t_adv_wen */
tmp = (t.we_on * 1000) + (6 * fclk_ps);
t.we_off = next_clk(t.we_on, tmp, fclk_ps);

t.cs_wr_off = t.we_off;

tmp = t.cs_wr_off * 1000 + 7000 /* t_scsn_rdy_z */;
t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

t.clk_activation = gpmc_ticks_to_ns(1);
memset(&dev_t, 0, sizeof(dev_t));

dev_t.mux = true;
dev_t.sync_read = true;
dev_t.sync_write = true;

dev_t.clk = 11100;
dev_t.t_bacc = 1000;
dev_t.t_ces = 1000;
dev_t.t_ceasu = 8 * 1000;
dev_t.t_avdasu = t_scsnh_advnh - 7000;
dev_t.t_ce_avd = 1000;
dev_t.t_avdp_r = t_scsnh_advnh;
dev_t.cyc_aavdh_oe = 3;
dev_t.cyc_oe = 5;
dev_t.t_ce_rdyz = 7000;
dev_t.t_avdp_w = t_scsnh_advnh;
dev_t.cyc_aavdh_we = 3;
dev_t.cyc_wpl = 6;
dev_t.t_ce_rdyz = 7000;

gpmc_calc_timings(&t, &dev_t);

return gpmc_cs_set_timings(sync_cs, &t);
}

extern unsigned long gpmc_get_fclk_period(void);

/* tusb driver calls this when it changes the chip's clocking */
int tusb6010_platform_retime(unsigned is_refclk)
{
static const char error[] =
KERN_ERR "tusb6010 %s retime error %d\n";

unsigned fclk_ps = gpmc_get_fclk_period();
unsigned sysclk_ps;
int status;

if (!refclk_psec || fclk_ps == 0)
if (!refclk_psec)
return -ENODEV;

sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;

status = tusb_set_async_mode(sysclk_ps, fclk_ps);
status = tusb_set_async_mode(sysclk_ps);
if (status < 0) {
printk(error, "async", status);
goto done;
}
status = tusb_set_sync_mode(sysclk_ps, fclk_ps);
status = tusb_set_sync_mode(sysclk_ps);
if (status < 0)
printk(error, "sync", status);
done:
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