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memory: mvebu-devbus: split functions

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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>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Link: https://lkml.kernel.org/r/1398202002-28530-8-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thomas Petazzoni 2014-04-22 23:26:11 +02:00 committed by Jason Cooper
parent 8a33692ee8
commit 30bd30b603
1 changed files with 51 additions and 39 deletions
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90
drivers/memory/mvebu-devbus.c
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@ -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