diff options
Diffstat (limited to 'drivers/memory/mvebu-devbus.c')
| -rw-r--r-- | drivers/memory/mvebu-devbus.c | 90 |
1 files changed, 51 insertions, 39 deletions
diff --git a/drivers/memory/mvebu-devbus.c b/drivers/memory/mvebu-devbus.c index 0f196b36cc3e..5dc9c6360943 100644 --- a/drivers/memory/mvebu-devbus.c +++ b/drivers/memory/mvebu-devbus.c @@ -89,19 +89,15 @@ static int get_timing_param_ps(struct devbus *devbus, return 0; } -static int devbus_set_timing_params(struct devbus *devbus, - struct device_node *node) +static int devbus_get_timing_params(struct devbus *devbus, + struct device_node *node, + struct devbus_read_params *r, + struct devbus_write_params *w) { - struct devbus_read_params r; - struct devbus_write_params w; - u32 value; int err; - dev_dbg(devbus->dev, "Setting timing parameter, tick is %lu ps\n", - devbus->tick_ps); - /* Get read timings */ - err = of_property_read_u32(node, "devbus,bus-width", &r.bus_width); + err = of_property_read_u32(node, "devbus,bus-width", &r->bus_width); if (err < 0) { dev_err(devbus->dev, "%s has no 'devbus,bus-width' property\n", @@ -113,48 +109,48 @@ static int devbus_set_timing_params(struct devbus *devbus, * The bus width is encoded into the register as 0 for 8 bits, * and 1 for 16 bits, so we do the necessary conversion here. */ - if (r.bus_width == 8) - r.bus_width = 0; - else if (r.bus_width == 16) - r.bus_width = 1; + if (r->bus_width == 8) + r->bus_width = 0; + else if (r->bus_width == 16) + r->bus_width = 1; else { - dev_err(devbus->dev, "invalid bus width %d\n", r.bus_width); + dev_err(devbus->dev, "invalid bus width %d\n", r->bus_width); return -EINVAL; } err = get_timing_param_ps(devbus, node, "devbus,badr-skew-ps", - &r.badr_skew); + &r->badr_skew); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,turn-off-ps", - &r.turn_off); + &r->turn_off); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,acc-first-ps", - &r.acc_first); + &r->acc_first); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,acc-next-ps", - &r.acc_next); + &r->acc_next); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,rd-setup-ps", - &r.rd_setup); + &r->rd_setup); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,rd-hold-ps", - &r.rd_hold); + &r->rd_hold); if (err < 0) return err; /* Get write timings */ err = of_property_read_u32(node, "devbus,sync-enable", - &w.sync_enable); + &w->sync_enable); if (err < 0) { dev_err(devbus->dev, "%s has no 'devbus,sync-enable' property\n", @@ -163,28 +159,38 @@ static int devbus_set_timing_params(struct devbus *devbus, } err = get_timing_param_ps(devbus, node, "devbus,ale-wr-ps", - &w.ale_wr); + &w->ale_wr); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,wr-low-ps", - &w.wr_low); + &w->wr_low); if (err < 0) return err; err = get_timing_param_ps(devbus, node, "devbus,wr-high-ps", - &w.wr_high); + &w->wr_high); if (err < 0) return err; + return 0; +} + +static void devbus_armada_set_timing_params(struct devbus *devbus, + struct device_node *node, + struct devbus_read_params *r, + struct devbus_write_params *w) +{ + u32 value; + /* Set read timings */ - value = r.bus_width << ARMADA_DEV_WIDTH_SHIFT | - r.badr_skew << ARMADA_BADR_SKEW_SHIFT | - r.rd_hold << ARMADA_RD_HOLD_SHIFT | - r.acc_next << ARMADA_ACC_NEXT_SHIFT | - r.rd_setup << ARMADA_RD_SETUP_SHIFT | - r.acc_first << ARMADA_ACC_FIRST_SHIFT | - r.turn_off; + value = r->bus_width << ARMADA_DEV_WIDTH_SHIFT | + r->badr_skew << ARMADA_BADR_SKEW_SHIFT | + r->rd_hold << ARMADA_RD_HOLD_SHIFT | + r->acc_next << ARMADA_ACC_NEXT_SHIFT | + r->rd_setup << ARMADA_RD_SETUP_SHIFT | + r->acc_first << ARMADA_ACC_FIRST_SHIFT | + r->turn_off; dev_dbg(devbus->dev, "read parameters register 0x%p = 0x%x\n", devbus->base + ARMADA_READ_PARAM_OFFSET, @@ -193,24 +199,24 @@ static int devbus_set_timing_params(struct devbus *devbus, writel(value, devbus->base + ARMADA_READ_PARAM_OFFSET); /* Set write timings */ - value = w.sync_enable << ARMADA_SYNC_ENABLE_SHIFT | - w.wr_low << ARMADA_WR_LOW_SHIFT | - w.wr_high << ARMADA_WR_HIGH_SHIFT | - w.ale_wr; + value = w->sync_enable << ARMADA_SYNC_ENABLE_SHIFT | + w->wr_low << ARMADA_WR_LOW_SHIFT | + w->wr_high << ARMADA_WR_HIGH_SHIFT | + w->ale_wr; dev_dbg(devbus->dev, "write parameters register: 0x%p = 0x%x\n", devbus->base + ARMADA_WRITE_PARAM_OFFSET, value); writel(value, devbus->base + ARMADA_WRITE_PARAM_OFFSET); - - return 0; } static int mvebu_devbus_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *node = pdev->dev.of_node; + struct devbus_read_params r; + struct devbus_write_params w; struct devbus *devbus; struct resource *res; struct clk *clk; @@ -240,11 +246,17 @@ static int mvebu_devbus_probe(struct platform_device *pdev) rate = clk_get_rate(clk) / 1000; devbus->tick_ps = 1000000000 / rate; - /* Read the device tree node and set the new timing parameters */ - err = devbus_set_timing_params(devbus, node); + dev_dbg(devbus->dev, "Setting timing parameter, tick is %lu ps\n", + devbus->tick_ps); + + /* Read the Device Tree node */ + err = devbus_get_timing_params(devbus, node, &r, &w); if (err < 0) return err; + /* Set the new timing parameters */ + devbus_armada_set_timing_params(devbus, node, &r, &w); + /* * We need to create a child device explicitly from here to * guarantee that the child will be probed after the timing |