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memory: mvebu-devbus: add Orion5x support

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This commit adds support for the Orion5x family of Marvell processors
into the mvebu-devbus driver. It differs from the already supported
Armada 370/XP by:

 * Having a single register (instead of two) for doing all the timing
   configuration.

 * Having a few less timing configuration parameters.

For this reason, a separate compatible string "marvell,orion-devbus"
is introduced.

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/1398202002-28530-9-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 23:26:12 +02:00 committed by Jason Cooper
parent 30bd30b603
commit c4ec7430c3
2 changed files with 104 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
Documentation/devicetree/bindings/memory-controllers/mvebu-devbus.txt
View File

@ -6,10 +6,11 @@ The actual devices are instantiated from the child nodes of a Device Bus node.
Required properties:
- compatible: Currently only Armada 370/XP SoC are supported,
with this compatible string:
- compatible: Armada 370/XP SoC are supported using the
"marvell,mvebu-devbus" compatible string.
marvell,mvebu-devbus
Orion5x SoC are supported using the
"marvell,orion-devbus" compatible string.
- reg: A resource specifier for the register space.
This is the base address of a chip select within
@ -22,7 +23,7 @@ Required properties:
integer values for each chip-select line in use:
0 <physical address of mapping> <size>
Mandatory timing properties for child nodes:
Timing properties for child nodes:
Read parameters:
@ -30,21 +31,26 @@ Read parameters:
drive the AD bus after the completion of a device read.
This prevents contentions on the Device Bus after a read
cycle from a slow device.
Mandatory.
- devbus,bus-width: Defines the bus width (e.g. <16>)
- devbus,bus-width: Defines the bus width, in bits (e.g. <16>).
Mandatory.
- devbus,badr-skew-ps: Defines the time delay from from A[2:0] toggle,
to read data sample. This parameter is useful for
synchronous pipelined devices, where the address
precedes the read data by one or two cycles.
Mandatory.
- devbus,acc-first-ps: Defines the time delay from the negation of
ALE[0] to the cycle that the first read data is sampled
by the controller.
Mandatory.
- devbus,acc-next-ps: Defines the time delay between the cycle that
samples data N and the cycle that samples data N+1
(in burst accesses).
Mandatory.
- devbus,rd-setup-ps: Defines the time delay between DEV_CSn assertion to
DEV_OEn assertion. If set to 0 (default),
@ -52,6 +58,8 @@ Read parameters:
This parameter has no affect on <acc-first-ps> parameter
(no affect on first data sample). Set <rd-setup-ps>
to a value smaller than <acc-first-ps>.
Mandatory for "marvell,mvebu-devbus"
compatible string, ignored otherwise.
- devbus,rd-hold-ps: Defines the time between the last data sample to the
de-assertion of DEV_CSn. If set to 0 (default),
@ -62,16 +70,20 @@ Read parameters:
last data sampled. Also this parameter has no
affect on <turn-off-ps> parameter.
Set <rd-hold-ps> to a value smaller than <turn-off-ps>.
Mandatory for "marvell,mvebu-devbus"
compatible string, ignored otherwise.
Write parameters:
- devbus,ale-wr-ps: Defines the time delay from the ALE[0] negation cycle
to the DEV_WEn assertion.
Mandatory.
- devbus,wr-low-ps: Defines the time during which DEV_WEn is active.
A[2:0] and Data are kept valid as long as DEV_WEn
is active. This parameter defines the setup time of
address and data to DEV_WEn rise.
Mandatory.
- devbus,wr-high-ps: Defines the time during which DEV_WEn is kept
inactive (high) between data beats of a burst write.
@ -79,10 +91,13 @@ Write parameters:
<wr-high-ps> - <tick> ps.
This parameter defines the hold time of address and
data after DEV_WEn rise.
Mandatory.
- devbus,sync-enable: Synchronous device enable.
1: True
0: False
Mandatory for "marvell,mvebu-devbus" compatible
string, ignored otherwise.
An example for an Armada XP GP board, with a 16 MiB NOR device as child
is showed below. Note that the Device Bus driver is in charge of allocating

103
drivers/memory/mvebu-devbus.c
View File

@ -2,7 +2,7 @@
* Marvell EBU SoC Device Bus Controller
* (memory controller for NOR/NAND/SRAM/FPGA devices)
*
* Copyright (C) 2013 Marvell
* Copyright (C) 2013-2014 Marvell
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -44,6 +44,34 @@
#define ARMADA_READ_PARAM_OFFSET 0x0
#define ARMADA_WRITE_PARAM_OFFSET 0x4
#define ORION_RESERVED (0x2 << 30)
#define ORION_BADR_SKEW_SHIFT 28
#define ORION_WR_HIGH_EXT_BIT BIT(27)
#define ORION_WR_HIGH_EXT_MASK 0x8
#define ORION_WR_LOW_EXT_BIT BIT(26)
#define ORION_WR_LOW_EXT_MASK 0x8
#define ORION_ALE_WR_EXT_BIT BIT(25)
#define ORION_ALE_WR_EXT_MASK 0x8
#define ORION_ACC_NEXT_EXT_BIT BIT(24)
#define ORION_ACC_NEXT_EXT_MASK 0x10
#define ORION_ACC_FIRST_EXT_BIT BIT(23)
#define ORION_ACC_FIRST_EXT_MASK 0x10
#define ORION_TURN_OFF_EXT_BIT BIT(22)
#define ORION_TURN_OFF_EXT_MASK 0x8
#define ORION_DEV_WIDTH_SHIFT 20
#define ORION_WR_HIGH_SHIFT 17
#define ORION_WR_HIGH_MASK 0x7
#define ORION_WR_LOW_SHIFT 14
#define ORION_WR_LOW_MASK 0x7
#define ORION_ALE_WR_SHIFT 11
#define ORION_ALE_WR_MASK 0x7
#define ORION_ACC_NEXT_SHIFT 7
#define ORION_ACC_NEXT_MASK 0xF
#define ORION_ACC_FIRST_SHIFT 3
#define ORION_ACC_FIRST_MASK 0xF
#define ORION_TURN_OFF_SHIFT 0
#define ORION_TURN_OFF_MASK 0x7
struct devbus_read_params {
u32 bus_width;
u32 badr_skew;
@ -96,7 +124,6 @@ static int devbus_get_timing_params(struct devbus *devbus,
{
int err;
/* Get read timings */
err = of_property_read_u32(node, "devbus,bus-width", &r->bus_width);
if (err < 0) {
dev_err(devbus->dev,
@ -138,24 +165,25 @@ static int devbus_get_timing_params(struct devbus *devbus,
if (err < 0)
return err;
err = get_timing_param_ps(devbus, node, "devbus,rd-setup-ps",
&r->rd_setup);
if (err < 0)
return err;
if (of_device_is_compatible(devbus->dev->of_node, "marvell,mvebu-devbus")) {
err = get_timing_param_ps(devbus, node, "devbus,rd-setup-ps",
&r->rd_setup);
if (err < 0)
return err;
err = get_timing_param_ps(devbus, node, "devbus,rd-hold-ps",
&r->rd_hold);
if (err < 0)
return err;
err = get_timing_param_ps(devbus, node, "devbus,rd-hold-ps",
&r->rd_hold);
if (err < 0)
return err;
/* Get write timings */
err = of_property_read_u32(node, "devbus,sync-enable",
&w->sync_enable);
if (err < 0) {
dev_err(devbus->dev,
"%s has no 'devbus,sync-enable' property\n",
node->full_name);
return err;
err = of_property_read_u32(node, "devbus,sync-enable",
&w->sync_enable);
if (err < 0) {
dev_err(devbus->dev,
"%s has no 'devbus,sync-enable' property\n",
node->full_name);
return err;
}
}
err = get_timing_param_ps(devbus, node, "devbus,ale-wr-ps",
@ -176,6 +204,39 @@ static int devbus_get_timing_params(struct devbus *devbus,
return 0;
}
static void devbus_orion_set_timing_params(struct devbus *devbus,
struct device_node *node,
struct devbus_read_params *r,
struct devbus_write_params *w)
{
u32 value;
/*
* The hardware designers found it would be a good idea to
* split most of the values in the register into two fields:
* one containing all the low-order bits, and another one
* containing just the high-order bit. For all of those
* fields, we have to split the value into these two parts.
*/
value = (r->turn_off & ORION_TURN_OFF_MASK) << ORION_TURN_OFF_SHIFT |
(r->acc_first & ORION_ACC_FIRST_MASK) << ORION_ACC_FIRST_SHIFT |
(r->acc_next & ORION_ACC_NEXT_MASK) << ORION_ACC_NEXT_SHIFT |
(w->ale_wr & ORION_ALE_WR_MASK) << ORION_ALE_WR_SHIFT |
(w->wr_low & ORION_WR_LOW_MASK) << ORION_WR_LOW_SHIFT |
(w->wr_high & ORION_WR_HIGH_MASK) << ORION_WR_HIGH_SHIFT |
r->bus_width << ORION_DEV_WIDTH_SHIFT |
((r->turn_off & ORION_TURN_OFF_EXT_MASK) ? ORION_TURN_OFF_EXT_BIT : 0) |
((r->acc_first & ORION_ACC_FIRST_EXT_MASK) ? ORION_ACC_FIRST_EXT_BIT : 0) |
((r->acc_next & ORION_ACC_NEXT_EXT_MASK) ? ORION_ACC_NEXT_EXT_BIT : 0) |
((w->ale_wr & ORION_ALE_WR_EXT_MASK) ? ORION_ALE_WR_EXT_BIT : 0) |
((w->wr_low & ORION_WR_LOW_EXT_MASK) ? ORION_WR_LOW_EXT_BIT : 0) |
((w->wr_high & ORION_WR_HIGH_EXT_MASK) ? ORION_WR_HIGH_EXT_BIT : 0) |
(r->badr_skew << ORION_BADR_SKEW_SHIFT) |
ORION_RESERVED;
writel(value, devbus->base);
}
static void devbus_armada_set_timing_params(struct devbus *devbus,
struct device_node *node,
struct devbus_read_params *r,
@ -255,7 +316,10 @@ static int mvebu_devbus_probe(struct platform_device *pdev)
return err;
/* Set the new timing parameters */
devbus_armada_set_timing_params(devbus, node, &r, &w);
if (of_device_is_compatible(node, "marvell,orion-devbus"))
devbus_orion_set_timing_params(devbus, node, &r, &w);
else
devbus_armada_set_timing_params(devbus, node, &r, &w);
/*
* We need to create a child device explicitly from here to
@ -271,6 +335,7 @@ static int mvebu_devbus_probe(struct platform_device *pdev)
static const struct of_device_id mvebu_devbus_of_match[] = {
{ .compatible = "marvell,mvebu-devbus" },
{ .compatible = "marvell,orion-devbus" },
{},
};
MODULE_DEVICE_TABLE(of, mvebu_devbus_of_match);