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This is a set of patches removing the board file code 

for Versatile flash handling and instead moving it over
 to the device tree and a special add-on file.
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Merge tag 'versatile-flash-for-arm-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator into next/drivers

Merge "move Versatile flash protection to the device tree" from Linus Walleij:

This is a set of patches removing the board file code
for Versatile flash handling and instead moving it over
to the device tree and a special add-on file.

* tag 'versatile-flash-for-arm-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator:
  ARM: integrator: move flash registration to device tree
  ARM: versatile: move flash registration to the device tree
  mtd: augment the "arm,versatile-flash" bindings
  mtd: physmap_of: add a hook for Versatile write protection

Acked-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Arnd Bergmann 2016-04-25 23:41:01 +02:00
parent a961bf24ba 91011a7605
commit 26a8eb59e0
11 changed files with 310 additions and 164 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
Documentation/devicetree/bindings/mtd/arm-versatile.txt
View File

@ -1,8 +1,26 @@
Flash device on ARM Versatile board
These flash chips are found in the ARM reference designs like Integrator,
Versatile, RealView, Versatile Express etc.
They are regular CFI compatible (Intel or AMD extended) flash chips with
some special write protect/VPP bits that can be controlled by the machine's
system controller.
Required properties:
- compatible : must be "arm,versatile-flash";
- compatible : must be "arm,versatile-flash", "cfi-flash";
- reg : memory address for the flash chip
- bank-width : width in bytes of flash interface.
For the rest of the properties, see mtd-physmap.txt.
The device tree may optionally contain sub-nodes describing partitions of the
address space. See partition.txt for more detail.
Example:
flash@34000000 {
compatible = "arm,versatile-flash", "cfi-flash";
reg = <0x34000000 0x4000000>;
bank-width = <4>;
};

3
arch/arm/boot/dts/integrator.dtsi
View File

@ -52,8 +52,9 @@
};
flash@24000000 {
compatible = "cfi-flash";
compatible = "arm,versatile-flash", "cfi-flash";
reg = <0x24000000 0x02000000>;
bank-width = <4>;
};
fpga {

5
arch/arm/boot/dts/versatile-ab.dts
View File

@ -119,8 +119,9 @@
};
flash@34000000 {
compatible = "arm,versatile-flash";
reg = <0x34000000 0x4000000>;
/* 64 MiB NOR flash in non-interleaved chips */
compatible = "arm,versatile-flash", "cfi-flash";
reg = <0x34000000 0x04000000>;
bank-width = <4>;
};

62
arch/arm/mach-integrator/integrator_ap.c
View File

@ -29,7 +29,6 @@
#include <linux/amba/kmi.h>
#include <linux/io.h>
#include <linux/irqchip.h>
#include <linux/mtd/physmap.h>
#include <linux/platform_data/clk-integrator.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
@ -146,65 +145,6 @@ static int __init irq_syscore_init(void)
device_initcall(irq_syscore_init);
/*
* Flash handling.
*/
static int ap_flash_init(struct platform_device *dev)
{
u32 tmp;
writel(INTEGRATOR_SC_CTRL_nFLVPPEN | INTEGRATOR_SC_CTRL_nFLWP,
ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
tmp = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET) |
INTEGRATOR_EBI_WRITE_ENABLE;
writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
if (!(readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET)
& INTEGRATOR_EBI_WRITE_ENABLE)) {
writel(0xa05f, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
}
return 0;
}
static void ap_flash_exit(struct platform_device *dev)
{
u32 tmp;
writel(INTEGRATOR_SC_CTRL_nFLVPPEN | INTEGRATOR_SC_CTRL_nFLWP,
ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
tmp = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET) &
~INTEGRATOR_EBI_WRITE_ENABLE;
writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
if (readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET) &
INTEGRATOR_EBI_WRITE_ENABLE) {
writel(0xa05f, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
}
}
static void ap_flash_set_vpp(struct platform_device *pdev, int on)
{
if (on)
writel(INTEGRATOR_SC_CTRL_nFLVPPEN,
ap_syscon_base + INTEGRATOR_SC_CTRLS_OFFSET);
else
writel(INTEGRATOR_SC_CTRL_nFLVPPEN,
ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
}
static struct physmap_flash_data ap_flash_data = {
.width = 4,
.init = ap_flash_init,
.exit = ap_flash_exit,
.set_vpp = ap_flash_set_vpp,
};
/*
* For the PL010 found in the Integrator/AP some of the UART control is
* implemented in the system controller and accessed using a callback
@ -266,8 +206,6 @@ static struct of_dev_auxdata ap_auxdata_lookup[] __initdata = {
"kmi0", NULL),
OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,
"kmi1", NULL),
OF_DEV_AUXDATA("cfi-flash", INTEGRATOR_FLASH_BASE,
"physmap-flash", &ap_flash_data),
{ /* sentinel */ },
};

51
arch/arm/mach-integrator/integrator_cp.c
View File

@ -23,7 +23,6 @@
#include <linux/io.h>
#include <linux/irqchip.h>
#include <linux/gfp.h>
#include <linux/mtd/physmap.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
@ -43,14 +42,8 @@
/* Base address to the CP controller */
static void __iomem *intcp_con_base;
#define INTCP_PA_FLASH_BASE 0x24000000
#define INTCP_PA_CLCD_BASE 0xc0000000
#define INTCP_FLASHPROG 0x04
#define CINTEGRATOR_FLASHPROG_FLVPPEN (1 << 0)
#define CINTEGRATOR_FLASHPROG_FLWREN (1 << 1)
/*
* Logical Physical
* f1000000 10000000 Core module registers
@ -107,48 +100,6 @@ static void __init intcp_map_io(void)
iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
}
/*
* Flash handling.
*/
static int intcp_flash_init(struct platform_device *dev)
{
u32 val;
val = readl(intcp_con_base + INTCP_FLASHPROG);
val |= CINTEGRATOR_FLASHPROG_FLWREN;
writel(val, intcp_con_base + INTCP_FLASHPROG);
return 0;
}
static void intcp_flash_exit(struct platform_device *dev)
{
u32 val;
val = readl(intcp_con_base + INTCP_FLASHPROG);
val &= ~(CINTEGRATOR_FLASHPROG_FLVPPEN|CINTEGRATOR_FLASHPROG_FLWREN);
writel(val, intcp_con_base + INTCP_FLASHPROG);
}
static void intcp_flash_set_vpp(struct platform_device *pdev, int on)
{
u32 val;
val = readl(intcp_con_base + INTCP_FLASHPROG);
if (on)
val |= CINTEGRATOR_FLASHPROG_FLVPPEN;
else
val &= ~CINTEGRATOR_FLASHPROG_FLVPPEN;
writel(val, intcp_con_base + INTCP_FLASHPROG);
}
static struct physmap_flash_data intcp_flash_data = {
.width = 4,
.init = intcp_flash_init,
.exit = intcp_flash_exit,
.set_vpp = intcp_flash_set_vpp,
};
/*
* It seems that the card insertion interrupt remains active after
* we've acknowledged it. We therefore ignore the interrupt, and
@ -260,8 +211,6 @@ static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
"aaci", &mmc_data),
OF_DEV_AUXDATA("arm,primecell", INTCP_PA_CLCD_BASE,
"clcd", &clcd_data),
OF_DEV_AUXDATA("cfi-flash", INTCP_PA_FLASH_BASE,
"physmap-flash", &intcp_flash_data),
{ /* sentinel */ },
};

47
arch/arm/mach-versatile/versatile_dt.c
View File

@ -32,7 +32,6 @@
#include <linux/amba/clcd.h>
#include <linux/platform_data/video-clcd-versatile.h>
#include <linux/amba/mmci.h>
#include <linux/mtd/physmap.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@ -41,12 +40,6 @@
#define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000)
#define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n))
/*
* Memory definitions
*/
#define VERSATILE_FLASH_BASE 0x34000000
#define VERSATILE_FLASH_SIZE SZ_64M
/*
* ------------------------------------------------------------------------
* Versatile Registers
@ -54,14 +47,8 @@
*/
#define VERSATILE_SYS_PCICTL_OFFSET 0x44
#define VERSATILE_SYS_MCI_OFFSET 0x48
#define VERSATILE_SYS_FLASH_OFFSET 0x4C
#define VERSATILE_SYS_CLCD_OFFSET 0x50
/*
* VERSATILE_SYS_FLASH
*/
#define VERSATILE_FLASHPROG_FLVPPEN (1 << 0) /* Enable writing to flash */
/*
* VERSATILE peripheral addresses
*/
@ -86,39 +73,6 @@
static void __iomem *versatile_sys_base;
static void __iomem *versatile_ib2_ctrl;
static void versatile_flash_set_vpp(struct platform_device *pdev, int on)
{
u32 val;
val = readl(versatile_sys_base + VERSATILE_SYS_FLASH_OFFSET);
if (on)
val |= VERSATILE_FLASHPROG_FLVPPEN;
else
val &= ~VERSATILE_FLASHPROG_FLVPPEN;
writel(val, versatile_sys_base + VERSATILE_SYS_FLASH_OFFSET);
}
static struct physmap_flash_data versatile_flash_data = {
.width = 4,
.set_vpp = versatile_flash_set_vpp,
};
static struct resource versatile_flash_resource = {
.start = VERSATILE_FLASH_BASE,
.end = VERSATILE_FLASH_BASE + VERSATILE_FLASH_SIZE - 1,
.flags = IORESOURCE_MEM,
};
struct platform_device versatile_flash_device = {
.name = "physmap-flash",
.id = 0,
.dev = {
.platform_data = &versatile_flash_data,
},
.num_resources = 1,
.resource = &versatile_flash_resource,
};
unsigned int mmc_status(struct device *dev)
{
struct amba_device *adev = container_of(dev, struct amba_device, dev);
@ -390,7 +344,6 @@ static void __init versatile_dt_init(void)
versatile_dt_pci_init();
platform_device_register(&versatile_flash_device);
of_platform_populate(NULL, of_default_bus_match_table,
versatile_auxdata_lookup, NULL);
}

10
drivers/mtd/maps/Kconfig
View File

@ -74,6 +74,16 @@ config MTD_PHYSMAP_OF
physically into the CPU's memory. The mapping description here is
taken from OF device tree.
config MTD_PHYSMAP_OF_VERSATILE
bool "Support ARM Versatile physmap OF"
depends on MTD_PHYSMAP_OF
depends on MFD_SYSCON
default y if (ARCH_INTEGRATOR || ARCH_VERSATILE || REALVIEW_DT)
help
This provides some extra DT physmap parsing for the ARM Versatile
platforms, basically to add a VPP (write protection) callback so
the flash can be taken out of write protection.
config MTD_PMC_MSP_EVM
tristate "CFI Flash device mapped on PMC-Sierra MSP"
depends on PMC_MSP && MTD_CFI

1
drivers/mtd/maps/Makefile
View File

@ -18,6 +18,7 @@ obj-$(CONFIG_MTD_TSUNAMI) += tsunami_flash.o
obj-$(CONFIG_MTD_PXA2XX) += pxa2xx-flash.o
obj-$(CONFIG_MTD_PHYSMAP) += physmap.o
obj-$(CONFIG_MTD_PHYSMAP_OF) += physmap_of.o
obj-$(CONFIG_MTD_PHYSMAP_OF_VERSATILE) += physmap_of_versatile.o
obj-$(CONFIG_MTD_PISMO) += pismo.o
obj-$(CONFIG_MTD_PMC_MSP_EVM) += pmcmsp-flash.o
obj-$(CONFIG_MTD_PCMCIA) += pcmciamtd.o

6
drivers/mtd/maps/physmap_of.c
View File

@ -24,6 +24,7 @@
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include "physmap_of_versatile.h"
struct of_flash_list {
struct mtd_info *mtd;
@ -240,6 +241,11 @@ static int of_flash_probe(struct platform_device *dev)
info->list[i].map.size = res_size;
info->list[i].map.bankwidth = be32_to_cpup(width);
info->list[i].map.device_node = dp;
err = of_flash_probe_versatile(dev, dp, &info->list[i].map);
if (err) {
dev_err(&dev->dev, "Can't probe Versatile VPP\n");
return err;
}
err = -ENOMEM;
info->list[i].map.virt = ioremap(info->list[i].map.phys,

253
drivers/mtd/maps/physmap_of_versatile.c Normal file
View File

@ -0,0 +1,253 @@
/*
* Versatile OF physmap driver add-on
*
* Copyright (c) 2016, Linaro Limited
* 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 as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/mtd/map.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/bitops.h>
#include "physmap_of_versatile.h"
static struct regmap *syscon_regmap;
enum versatile_flashprot {
INTEGRATOR_AP_FLASHPROT,
INTEGRATOR_CP_FLASHPROT,
VERSATILE_FLASHPROT,
REALVIEW_FLASHPROT,
};
static const struct of_device_id syscon_match[] = {
{
.compatible = "arm,integrator-ap-syscon",
.data = (void *)INTEGRATOR_AP_FLASHPROT,
},
{
.compatible = "arm,integrator-cp-syscon",
.data = (void *)INTEGRATOR_CP_FLASHPROT,
},
{
.compatible = "arm,core-module-versatile",
.data = (void *)VERSATILE_FLASHPROT,
},
{
.compatible = "arm,realview-eb-syscon",
.data = (void *)REALVIEW_FLASHPROT,
},
{
.compatible = "arm,realview-pb1176-syscon",
.data = (void *)REALVIEW_FLASHPROT,
},
{
.compatible = "arm,realview-pb11mp-syscon",
.data = (void *)REALVIEW_FLASHPROT,
},
{
.compatible = "arm,realview-pba8-syscon",
.data = (void *)REALVIEW_FLASHPROT,
},
{
.compatible = "arm,realview-pbx-syscon",
.data = (void *)REALVIEW_FLASHPROT,
},
{},
};
/*
* Flash protection handling for the Integrator/AP
*/
#define INTEGRATOR_SC_CTRLS_OFFSET 0x08
#define INTEGRATOR_SC_CTRLC_OFFSET 0x0C
#define INTEGRATOR_SC_CTRL_FLVPPEN BIT(1)
#define INTEGRATOR_SC_CTRL_FLWP BIT(2)
#define INTEGRATOR_EBI_CSR1_OFFSET 0x04
/* The manual says bit 2, the code says bit 3, trust the code */
#define INTEGRATOR_EBI_WRITE_ENABLE BIT(3)
#define INTEGRATOR_EBI_LOCK_OFFSET 0x20
#define INTEGRATOR_EBI_LOCK_VAL 0xA05F
static const struct of_device_id ebi_match[] = {
{ .compatible = "arm,external-bus-interface"},
{ },
};
static int ap_flash_init(struct platform_device *pdev)
{
struct device_node *ebi;
static void __iomem *ebi_base;
u32 val;
int ret;
/* Look up the EBI */
ebi = of_find_matching_node(NULL, ebi_match);
if (!ebi) {
return -ENODEV;
}
ebi_base = of_iomap(ebi, 0);
if (!ebi_base)
return -ENODEV;
/* Clear VPP and write protection bits */
ret = regmap_write(syscon_regmap,
INTEGRATOR_SC_CTRLC_OFFSET,
INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP);
if (ret)
dev_err(&pdev->dev, "error clearing Integrator VPP/WP\n");
/* Unlock the EBI */
writel(INTEGRATOR_EBI_LOCK_VAL, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
/* Enable write cycles on the EBI, CSR1 (flash) */
val = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
val |= INTEGRATOR_EBI_WRITE_ENABLE;
writel(val, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
/* Lock the EBI again */
writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
iounmap(ebi_base);
return 0;
}
static void ap_flash_set_vpp(struct map_info *map, int on)
{
int ret;
if (on) {
ret = regmap_write(syscon_regmap,
INTEGRATOR_SC_CTRLS_OFFSET,
INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP);
if (ret)
pr_err("error enabling AP VPP\n");
} else {
ret = regmap_write(syscon_regmap,
INTEGRATOR_SC_CTRLC_OFFSET,
INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP);
if (ret)
pr_err("error disabling AP VPP\n");
}
}
/*
* Flash protection handling for the Integrator/CP
*/
#define INTCP_FLASHPROG_OFFSET 0x04
#define CINTEGRATOR_FLVPPEN BIT(0)
#define CINTEGRATOR_FLWREN BIT(1)
#define CINTEGRATOR_FLMASK BIT(0)|BIT(1)
static void cp_flash_set_vpp(struct map_info *map, int on)
{
int ret;
if (on) {
ret = regmap_update_bits(syscon_regmap,
INTCP_FLASHPROG_OFFSET,
CINTEGRATOR_FLMASK,
CINTEGRATOR_FLVPPEN | CINTEGRATOR_FLWREN);
if (ret)
pr_err("error setting CP VPP\n");
} else {
ret = regmap_update_bits(syscon_regmap,
INTCP_FLASHPROG_OFFSET,
CINTEGRATOR_FLMASK,
0);
if (ret)
pr_err("error setting CP VPP\n");
}
}
/*
* Flash protection handling for the Versatiles and RealViews
*/
#define VERSATILE_SYS_FLASH_OFFSET 0x4C
static void versatile_flash_set_vpp(struct map_info *map, int on)
{
int ret;
ret = regmap_update_bits(syscon_regmap, VERSATILE_SYS_FLASH_OFFSET,
0x01, !!on);
if (ret)
pr_err("error setting Versatile VPP\n");
}
int of_flash_probe_versatile(struct platform_device *pdev,
struct device_node *np,
struct map_info *map)
{
struct device_node *sysnp;
const struct of_device_id *devid;
struct regmap *rmap;
static enum versatile_flashprot versatile_flashprot;
int ret;
/* Not all flash chips use this protection line */
if (!of_device_is_compatible(np, "arm,versatile-flash"))
return 0;
/* For first chip probed, look up the syscon regmap */
if (!syscon_regmap) {
sysnp = of_find_matching_node_and_match(NULL,
syscon_match,
&devid);
if (!sysnp)
return -ENODEV;
versatile_flashprot = (enum versatile_flashprot)devid->data;
rmap = syscon_node_to_regmap(sysnp);
if (IS_ERR(rmap))
return PTR_ERR(rmap);
syscon_regmap = rmap;
}
switch (versatile_flashprot) {
case INTEGRATOR_AP_FLASHPROT:
ret = ap_flash_init(pdev);
if (ret)
return ret;
map->set_vpp = ap_flash_set_vpp;
dev_info(&pdev->dev, "Integrator/AP flash protection\n");
break;
case INTEGRATOR_CP_FLASHPROT:
map->set_vpp = cp_flash_set_vpp;
dev_info(&pdev->dev, "Integrator/CP flash protection\n");
break;
case VERSATILE_FLASHPROT:
case REALVIEW_FLASHPROT:
map->set_vpp = versatile_flash_set_vpp;
dev_info(&pdev->dev, "versatile/realview flash protection\n");
break;
default:
dev_info(&pdev->dev, "device marked as Versatile flash "
"but no system controller was found\n");
break;
}
return 0;
}

16
drivers/mtd/maps/physmap_of_versatile.h Normal file
View File

@ -0,0 +1,16 @@
#include <linux/of.h>
#include <linux/mtd/map.h>
#ifdef CONFIG_MTD_PHYSMAP_OF_VERSATILE
int of_flash_probe_versatile(struct platform_device *pdev,
struct device_node *np,
struct map_info *map);
#else
static inline
int of_flash_probe_versatile(struct platform_device *pdev,
struct device_node *np,
struct map_info *map)
{
return 0;
}
#endif