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Qualcomm EBI2 bindings and bus driver. 

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Merge tag 'qcom-ebi2-arm-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator into next/drivers

Pull "Qualcomm EBI2 bindings and bus driver" from Linus Walleij

* tag 'qcom-ebi2-arm-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator:
  bus: qcom: add EBI2 driver
  bus: qcom: add EBI2 device tree bindings

Acked-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Arnd Bergmann 2016-09-21 22:41:28 +02:00
parent f5f8aaf98d 335a127548
commit ea19b4cd61
4 changed files with 554 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

138
Documentation/devicetree/bindings/bus/qcom,ebi2.txt Normal file
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@ -0,0 +1,138 @@
Qualcomm External Bus Interface 2 (EBI2)
The EBI2 contains two peripheral blocks: XMEM and LCDC. The XMEM handles any
external memory (such as NAND or other memory-mapped peripherals) whereas
LCDC handles LCD displays.
As it says it connects devices to an external bus interface, meaning address
lines (up to 9 address lines so can only address 1KiB external memory space),
data lines (16 bits), OE (output enable), ADV (address valid, used on some
NOR flash memories), WE (write enable). This on top of 6 different chip selects
(CS0 thru CS5) so that in theory 6 different devices can be connected.
Apparently this bus is clocked at 64MHz. It has dedicated pins on the package
and the bus can only come out on these pins, however if some of the pins are
unused they can be left unconnected or remuxed to be used as GPIO or in some
cases other orthogonal functions as well.
Also CS1 and CS2 has -A and -B signals. Why they have that is unclear to me.
The chip selects have the following memory range assignments. This region of
memory is referred to as "Chip Peripheral SS FPB0" and is 168MB big.
Chip Select Physical address base
CS0 GPIO134 0x1a800000-0x1b000000 (8MB)
CS1 GPIO39 (A) / GPIO123 (B) 0x1b000000-0x1b800000 (8MB)
CS2 GPIO40 (A) / GPIO124 (B) 0x1b800000-0x1c000000 (8MB)
CS3 GPIO133 0x1d000000-0x25000000 (128 MB)
CS4 GPIO132 0x1c800000-0x1d000000 (8MB)
CS5 GPIO131 0x1c000000-0x1c800000 (8MB)
The APQ8060 Qualcomm Application Processor User Guide, 80-N7150-14 Rev. A,
August 6, 2012 contains some incomplete documentation of the EBI2.
FIXME: the manual mentions "write precharge cycles" and "precharge cycles".
We have not been able to figure out which bit fields these correspond to
in the hardware, or what valid values exist. The current hypothesis is that
this is something just used on the FAST chip selects and that the SLOW
chip selects are understood fully. There is also a "byte device enable"
flag somewhere for 8bit memories.
FIXME: The chipselects have SLOW and FAST configuration registers. It's a bit
unclear what this means, if they are mutually exclusive or can be used
together, or if some chip selects are hardwired to be FAST and others are SLOW
by design.
The XMEM registers are totally undocumented but could be partially decoded
because the Cypress AN49576 Antioch Westbridge apparently has suspiciously
similar register layout, see: http://www.cypress.com/file/105771/download
Required properties:
- compatible: should be one of:
"qcom,msm8660-ebi2"
"qcom,apq8060-ebi2"
- #address-cells: shoule be <2>: the first cell is the chipselect,
the second cell is the offset inside the memory range
- #size-cells: should be <1>
- ranges: should be set to:
ranges = <0 0x0 0x1a800000 0x00800000>,
<1 0x0 0x1b000000 0x00800000>,
<2 0x0 0x1b800000 0x00800000>,
<3 0x0 0x1d000000 0x08000000>,
<4 0x0 0x1c800000 0x00800000>,
<5 0x0 0x1c000000 0x00800000>;
- reg: two ranges of registers: EBI2 config and XMEM config areas
- reg-names: should be "ebi2", "xmem"
- clocks: two clocks, EBI_2X and EBI
- clock-names: shoule be "ebi2x", "ebi2"
Optional subnodes:
- Nodes inside the EBI2 will be considered device nodes.
The following optional properties are properties that can be tagged onto
any device subnode. We are assuming that there can be only ONE device per
chipselect subnode, else the properties will become ambigous.
Optional properties arrays for SLOW chip selects:
- qcom,xmem-recovery-cycles: recovery cycles is the time the memory continues to
drive the data bus after OE is de-asserted, in order to avoid contention on
the data bus. They are inserted when reading one CS and switching to another
CS or read followed by write on the same CS. Valid values 0 thru 15. Minimum
value is actually 1, so a value of 0 will still yield 1 recovery cycle.
- qcom,xmem-write-hold-cycles: write hold cycles, these are extra cycles
inserted after every write minimum 1. The data out is driven from the time
WE is asserted until CS is asserted. With a hold of 1 (value = 0), the CS
stays active for 1 extra cycle etc. Valid values 0 thru 15.
- qcom,xmem-write-delta-cycles: initial latency for write cycles inserted for
the first write to a page or burst memory. Valid values 0 thru 255.
- qcom,xmem-read-delta-cycles: initial latency for read cycles inserted for the
first read to a page or burst memory. Valid values 0 thru 255.
- qcom,xmem-write-wait-cycles: number of wait cycles for every write access, 0=1
cycle. Valid values 0 thru 15.
- qcom,xmem-read-wait-cycles: number of wait cycles for every read access, 0=1
cycle. Valid values 0 thru 15.
Optional properties arrays for FAST chip selects:
- qcom,xmem-address-hold-enable: this is a boolean property stating that we
shall hold the address for an extra cycle to meet hold time requirements
with ADV assertion.
- qcom,xmem-adv-to-oe-recovery-cycles: the number of cycles elapsed before an OE
assertion, with respect to the cycle where ADV (address valid) is asserted.
2 means 2 cycles between ADV and OE. Valid values 0, 1, 2 or 3.
- qcom,xmem-read-hold-cycles: the length in cycles of the first segment of a
read transfer. For a single read trandfer this will be the time from CS
assertion to OE assertion. Valid values 0 thru 15.
Example:
ebi2@1a100000 {
compatible = "qcom,apq8060-ebi2";
#address-cells = <2>;
#size-cells = <1>;
ranges = <0 0x0 0x1a800000 0x00800000>,
<1 0x0 0x1b000000 0x00800000>,
<2 0x0 0x1b800000 0x00800000>,
<3 0x0 0x1d000000 0x08000000>,
<4 0x0 0x1c800000 0x00800000>,
<5 0x0 0x1c000000 0x00800000>;
reg = <0x1a100000 0x1000>, <0x1a110000 0x1000>;
reg-names = "ebi2", "xmem";
clocks = <&gcc EBI2_2X_CLK>, <&gcc EBI2_CLK>;
clock-names = "ebi2x", "ebi2";
/* Make sure to set up the pin control for the EBI2 */
pinctrl-names = "default";
pinctrl-0 = <&foo_ebi2_pins>;
foo-ebi2@2,0 {
compatible = "foo";
reg = <2 0x0 0x100>;
(...)
qcom,xmem-recovery-cycles = <0>;
qcom,xmem-write-hold-cycles = <3>;
qcom,xmem-write-delta-cycles = <31>;
qcom,xmem-read-delta-cycles = <28>;
qcom,xmem-write-wait-cycles = <9>;
qcom,xmem-read-wait-cycles = <9>;
};
};

7
drivers/bus/Kconfig
View File

@ -108,6 +108,13 @@ config OMAP_OCP2SCP
OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
OCP2SCP.
config QCOM_EBI2
bool "Qualcomm External Bus Interface 2 (EBI2)"
help
Say y here to enable support for the Qualcomm External Bus
Interface 2, which can be used to connect things like NAND Flash,
SRAM, ethernet adapters, FPGAs and LCD displays.
config SIMPLE_PM_BUS
bool "Simple Power-Managed Bus Driver"
depends on OF && PM

1
drivers/bus/Makefile
View File

@ -15,6 +15,7 @@ obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o
obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o
obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
obj-$(CONFIG_QCOM_EBI2) += qcom-ebi2.o
obj-$(CONFIG_SUNXI_RSB) += sunxi-rsb.o
obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o
obj-$(CONFIG_TEGRA_ACONNECT) += tegra-aconnect.o

408
drivers/bus/qcom-ebi2.c Normal file
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@ -0,0 +1,408 @@
/*
* Qualcomm External Bus Interface 2 (EBI2) driver
* an older version of the Qualcomm Parallel Interface Controller (QPIC)
*
* Copyright (C) 2016 Linaro Ltd.
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* See the device tree bindings for this block for more details on the
* hardware.
*/
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
/*
* CS0, CS1, CS4 and CS5 are two bits wide, CS2 and CS3 are one bit.
*/
#define EBI2_CS0_ENABLE_MASK BIT(0)|BIT(1)
#define EBI2_CS1_ENABLE_MASK BIT(2)|BIT(3)
#define EBI2_CS2_ENABLE_MASK BIT(4)
#define EBI2_CS3_ENABLE_MASK BIT(5)
#define EBI2_CS4_ENABLE_MASK BIT(6)|BIT(7)
#define EBI2_CS5_ENABLE_MASK BIT(8)|BIT(9)
#define EBI2_CSN_MASK GENMASK(9, 0)
#define EBI2_XMEM_CFG 0x0000 /* Power management etc */
/*
* SLOW CSn CFG
*
* Bits 31-28: RECOVERY recovery cycles (0 = 1, 1 = 2 etc) this is the time the
* memory continues to drive the data bus after OE is de-asserted.
* Inserted when reading one CS and switching to another CS or read
* followed by write on the same CS. Valid values 0 thru 15.
* Bits 27-24: WR_HOLD write hold cycles, these are extra cycles inserted after
* every write minimum 1. The data out is driven from the time WE is
* asserted until CS is asserted. With a hold of 1, the CS stays
* active for 1 extra cycle etc. Valid values 0 thru 15.
* Bits 23-16: WR_DELTA initial latency for write cycles inserted for the first
* write to a page or burst memory
* Bits 15-8: RD_DELTA initial latency for read cycles inserted for the first
* read to a page or burst memory
* Bits 7-4: WR_WAIT number of wait cycles for every write access, 0=1 cycle
* so 1 thru 16 cycles.
* Bits 3-0: RD_WAIT number of wait cycles for every read access, 0=1 cycle
* so 1 thru 16 cycles.
*/
#define EBI2_XMEM_CS0_SLOW_CFG 0x0008
#define EBI2_XMEM_CS1_SLOW_CFG 0x000C
#define EBI2_XMEM_CS2_SLOW_CFG 0x0010
#define EBI2_XMEM_CS3_SLOW_CFG 0x0014
#define EBI2_XMEM_CS4_SLOW_CFG 0x0018
#define EBI2_XMEM_CS5_SLOW_CFG 0x001C
#define EBI2_XMEM_RECOVERY_SHIFT 28
#define EBI2_XMEM_WR_HOLD_SHIFT 24
#define EBI2_XMEM_WR_DELTA_SHIFT 16
#define EBI2_XMEM_RD_DELTA_SHIFT 8
#define EBI2_XMEM_WR_WAIT_SHIFT 4
#define EBI2_XMEM_RD_WAIT_SHIFT 0
/*
* FAST CSn CFG
* Bits 31-28: ?
* Bits 27-24: RD_HOLD: the length in cycles of the first segment of a read
* transfer. For a single read trandfer this will be the time
* from CS assertion to OE assertion.
* Bits 18-24: ?
* Bits 17-16: ADV_OE_RECOVERY, the number of cycles elapsed before an OE
* assertion, with respect to the cycle where ADV is asserted.
* 2 means 2 cycles between ADV and OE. Values 0, 1, 2 or 3.
* Bits 5: ADDR_HOLD_ENA, The address is held for an extra cycle to meet
* hold time requirements with ADV assertion.
*
* The manual mentions "write precharge cycles" and "precharge cycles".
* We have not been able to figure out which bit fields these correspond to
* in the hardware, or what valid values exist. The current hypothesis is that
* this is something just used on the FAST chip selects. There is also a "byte
* device enable" flag somewhere for 8bit memories.
*/
#define EBI2_XMEM_CS0_FAST_CFG 0x0028
#define EBI2_XMEM_CS1_FAST_CFG 0x002C
#define EBI2_XMEM_CS2_FAST_CFG 0x0030
#define EBI2_XMEM_CS3_FAST_CFG 0x0034
#define EBI2_XMEM_CS4_FAST_CFG 0x0038
#define EBI2_XMEM_CS5_FAST_CFG 0x003C
#define EBI2_XMEM_RD_HOLD_SHIFT 24
#define EBI2_XMEM_ADV_OE_RECOVERY_SHIFT 16
#define EBI2_XMEM_ADDR_HOLD_ENA_SHIFT 5
/**
* struct cs_data - struct with info on a chipselect setting
* @enable_mask: mask to enable the chipselect in the EBI2 config
* @slow_cfg0: offset to XMEMC slow CS config
* @fast_cfg1: offset to XMEMC fast CS config
*/
struct cs_data {
u32 enable_mask;
u16 slow_cfg;
u16 fast_cfg;
};
static const struct cs_data cs_info[] = {
{
/* CS0 */
.enable_mask = EBI2_CS0_ENABLE_MASK,
.slow_cfg = EBI2_XMEM_CS0_SLOW_CFG,
.fast_cfg = EBI2_XMEM_CS0_FAST_CFG,
},
{
/* CS1 */
.enable_mask = EBI2_CS1_ENABLE_MASK,
.slow_cfg = EBI2_XMEM_CS1_SLOW_CFG,
.fast_cfg = EBI2_XMEM_CS1_FAST_CFG,
},
{
/* CS2 */
.enable_mask = EBI2_CS2_ENABLE_MASK,
.slow_cfg = EBI2_XMEM_CS2_SLOW_CFG,
.fast_cfg = EBI2_XMEM_CS2_FAST_CFG,
},
{
/* CS3 */
.enable_mask = EBI2_CS3_ENABLE_MASK,
.slow_cfg = EBI2_XMEM_CS3_SLOW_CFG,
.fast_cfg = EBI2_XMEM_CS3_FAST_CFG,
},
{
/* CS4 */
.enable_mask = EBI2_CS4_ENABLE_MASK,
.slow_cfg = EBI2_XMEM_CS4_SLOW_CFG,
.fast_cfg = EBI2_XMEM_CS4_FAST_CFG,
},
{
/* CS5 */
.enable_mask = EBI2_CS5_ENABLE_MASK,
.slow_cfg = EBI2_XMEM_CS5_SLOW_CFG,
.fast_cfg = EBI2_XMEM_CS5_FAST_CFG,
},
};
/**
* struct ebi2_xmem_prop - describes an XMEM config property
* @prop: the device tree binding name
* @max: maximum value for the property
* @slowreg: true if this property is in the SLOW CS config register
* else it is assumed to be in the FAST config register
* @shift: the bit field start in the SLOW or FAST register for this
* property
*/
struct ebi2_xmem_prop {
const char *prop;
u32 max;
bool slowreg;
u16 shift;
};
static const struct ebi2_xmem_prop xmem_props[] = {
{
.prop = "qcom,xmem-recovery-cycles",
.max = 15,
.slowreg = true,
.shift = EBI2_XMEM_RECOVERY_SHIFT,
},
{
.prop = "qcom,xmem-write-hold-cycles",
.max = 15,
.slowreg = true,
.shift = EBI2_XMEM_WR_HOLD_SHIFT,
},
{
.prop = "qcom,xmem-write-delta-cycles",
.max = 255,
.slowreg = true,
.shift = EBI2_XMEM_WR_DELTA_SHIFT,
},
{
.prop = "qcom,xmem-read-delta-cycles",
.max = 255,
.slowreg = true,
.shift = EBI2_XMEM_RD_DELTA_SHIFT,
},
{
.prop = "qcom,xmem-write-wait-cycles",
.max = 15,
.slowreg = true,
.shift = EBI2_XMEM_WR_WAIT_SHIFT,
},
{
.prop = "qcom,xmem-read-wait-cycles",
.max = 15,
.slowreg = true,
.shift = EBI2_XMEM_RD_WAIT_SHIFT,
},
{
.prop = "qcom,xmem-address-hold-enable",
.max = 1, /* boolean prop */
.slowreg = false,
.shift = EBI2_XMEM_ADDR_HOLD_ENA_SHIFT,
},
{
.prop = "qcom,xmem-adv-to-oe-recovery-cycles",
.max = 3,
.slowreg = false,
.shift = EBI2_XMEM_ADV_OE_RECOVERY_SHIFT,
},
{
.prop = "qcom,xmem-read-hold-cycles",
.max = 15,
.slowreg = false,
.shift = EBI2_XMEM_RD_HOLD_SHIFT,
},
};
static void qcom_ebi2_setup_chipselect(struct device_node *np,
struct device *dev,
void __iomem *ebi2_base,
void __iomem *ebi2_xmem,
u32 csindex)
{
const struct cs_data *csd;
u32 slowcfg, fastcfg;
u32 val;
int ret;
int i;
csd = &cs_info[csindex];
val = readl(ebi2_base);
val |= csd->enable_mask;
writel(val, ebi2_base);
dev_dbg(dev, "enabled CS%u\n", csindex);
/* Next set up the XMEMC */
slowcfg = 0;
fastcfg = 0;
for (i = 0; i < ARRAY_SIZE(xmem_props); i++) {
const struct ebi2_xmem_prop *xp = &xmem_props[i];
/* All are regular u32 values */
ret = of_property_read_u32(np, xp->prop, &val);
if (ret) {
dev_dbg(dev, "could not read %s for CS%d\n",
xp->prop, csindex);
continue;
}
/* First check boolean props */
if (xp->max == 1 && val) {
if (xp->slowreg)
slowcfg |= BIT(xp->shift);
else
fastcfg |= BIT(xp->shift);
dev_dbg(dev, "set %s flag\n", xp->prop);
continue;
}
/* We're dealing with an u32 */
if (val > xp->max) {
dev_err(dev,
"too high value for %s: %u, capped at %u\n",
xp->prop, val, xp->max);
val = xp->max;
}
if (xp->slowreg)
slowcfg |= (val << xp->shift);
else
fastcfg |= (val << xp->shift);
dev_dbg(dev, "set %s to %u\n", xp->prop, val);
}
dev_info(dev, "CS%u: SLOW CFG 0x%08x, FAST CFG 0x%08x\n",
csindex, slowcfg, fastcfg);
if (slowcfg)
writel(slowcfg, ebi2_xmem + csd->slow_cfg);
if (fastcfg)
writel(fastcfg, ebi2_xmem + csd->fast_cfg);
}
static int qcom_ebi2_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
struct device *dev = &pdev->dev;
struct resource *res;
void __iomem *ebi2_base;
void __iomem *ebi2_xmem;
struct clk *ebi2xclk;
struct clk *ebi2clk;
bool have_children = false;
u32 val;
int ret;
ebi2xclk = devm_clk_get(dev, "ebi2x");
if (IS_ERR(ebi2xclk))
return PTR_ERR(ebi2xclk);
ret = clk_prepare_enable(ebi2xclk);
if (ret) {
dev_err(dev, "could not enable EBI2X clk (%d)\n", ret);
return ret;
}
ebi2clk = devm_clk_get(dev, "ebi2");
if (IS_ERR(ebi2clk)) {
ret = PTR_ERR(ebi2clk);
goto err_disable_2x_clk;
}
ret = clk_prepare_enable(ebi2clk);
if (ret) {
dev_err(dev, "could not enable EBI2 clk\n");
goto err_disable_2x_clk;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ebi2_base = devm_ioremap_resource(dev, res);
if (IS_ERR(ebi2_base)) {
ret = PTR_ERR(ebi2_base);
goto err_disable_clk;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
ebi2_xmem = devm_ioremap_resource(dev, res);
if (IS_ERR(ebi2_xmem)) {
ret = PTR_ERR(ebi2_xmem);
goto err_disable_clk;
}
/* Allegedly this turns the power save mode off */
writel(0UL, ebi2_xmem + EBI2_XMEM_CFG);
/* Disable all chipselects */
val = readl(ebi2_base);
val &= ~EBI2_CSN_MASK;
writel(val, ebi2_base);
/* Walk over the child nodes and see what chipselects we use */
for_each_available_child_of_node(np, child) {
u32 csindex;
/* Figure out the chipselect */
ret = of_property_read_u32(child, "reg", &csindex);
if (ret)
return ret;
if (csindex > 5) {
dev_err(dev,
"invalid chipselect %u, we only support 0-5\n",
csindex);
continue;
}
qcom_ebi2_setup_chipselect(child,
dev,
ebi2_base,
ebi2_xmem,
csindex);
/* We have at least one child */
have_children = true;
}
if (have_children)
return of_platform_default_populate(np, NULL, dev);
return 0;
err_disable_clk:
clk_disable_unprepare(ebi2clk);
err_disable_2x_clk:
clk_disable_unprepare(ebi2xclk);
return ret;
}
static const struct of_device_id qcom_ebi2_of_match[] = {
{ .compatible = "qcom,msm8660-ebi2", },
{ .compatible = "qcom,apq8060-ebi2", },
{ }
};
static struct platform_driver qcom_ebi2_driver = {
.probe = qcom_ebi2_probe,
.driver = {
.name = "qcom-ebi2",
.of_match_table = qcom_ebi2_of_match,
},
};
module_platform_driver(qcom_ebi2_driver);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("Qualcomm EBI2 driver");
MODULE_LICENSE("GPL");