@@ -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",
@@ -113,41 +109,41 @@ 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.
*/
- r.bus_width = (r.bus_width / 8) - 1;
+ r->bus_width = (r->bus_width / 8) - 1;
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",
@@ -156,28 +152,38 @@ 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_BIT |
- r.badr_skew << ARMADA_BADR_SKEW_BIT |
- r.rd_hold << ARMADA_RD_HOLD_BIT |
- r.acc_next << ARMADA_ACC_NEXT_BIT |
- r.rd_setup << ARMADA_RD_SETUP_BIT |
- r.acc_first << ARMADA_ACC_FIRST_BIT |
- r.turn_off;
+ value = r->bus_width << ARMADA_DEV_WIDTH_BIT |
+ r->badr_skew << ARMADA_BADR_SKEW_BIT |
+ r->rd_hold << ARMADA_RD_HOLD_BIT |
+ r->acc_next << ARMADA_ACC_NEXT_BIT |
+ r->rd_setup << ARMADA_RD_SETUP_BIT |
+ r->acc_first << ARMADA_ACC_FIRST_BIT |
+ r->turn_off;
dev_dbg(devbus->dev, "read parameters register 0x%p = 0x%x\n",
devbus->base + ARMADA_READ_PARAM_OFFSET,
@@ -186,24 +192,24 @@ 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_BIT |
- w.wr_low << ARMADA_WR_LOW_BIT |
- w.wr_high << ARMADA_WR_HIGH_BIT |
- w.ale_wr;
+ value = w->sync_enable << ARMADA_SYNC_ENABLE_BIT |
+ w->wr_low << ARMADA_WR_LOW_BIT |
+ w->wr_high << ARMADA_WR_HIGH_BIT |
+ 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;
@@ -233,11 +239,17 @@ 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
The mvebu-devbus driver currently only supports the Armada 370/XP family, but it can also cover the Orion5x family. However, the Orion5x family has a different organization of the registers. Therefore, in preparation to the introduction of Orion5x support, we separate into two functions the code that 1/ retrieves the timing parameters from the Device Tree and 2/ applies those timings parameters into the hardware registers. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> --- drivers/memory/mvebu-devbus.c | 82 +++++++++++++++++++++++++------------------ 1 file changed, 47 insertions(+), 35 deletions(-)