mtd: physmap_of: add a hook for Versatile write protection
In order to support device tree probing of Versatile NOR flash chips, there must be a way to add the VPP (write protection) enable/disable callback. The register in question is in the system controllers of these machines. Apart from this quirk, the ARM flash chips are standard CFI flash chips from various vendors. Additionally, the Integrator/AP require you to set up the external bus interface (EBI) to allow writes to the chip select where the flash memory is connected. Solve this by looking for the arm,versatile-flash compatible string in the flash device tree node. In the driver, add a special hook to check for the various Versatile syscons and register a callback for .set_vpp() if this compatible is present. Provide a special Kconfig entry for the addon hook so it will not be compiled in if the Versatile boards are not supported. Stubs in the header file make sure the impact will be zero on other platforms. (Compilers optimze this out.) With this patch, a large slew of ARM board file code can be removed. Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij
parent
9735a22799
commit
b0afd44bc1
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@ -74,6 +74,16 @@ config MTD_PHYSMAP_OF
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physically into the CPU's memory. The mapping description here is
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taken from OF device tree.
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config MTD_PHYSMAP_OF_VERSATILE
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bool "Support ARM Versatile physmap OF"
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depends on MTD_PHYSMAP_OF
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depends on MFD_SYSCON
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default y if (ARCH_INTEGRATOR || ARCH_VERSATILE || REALVIEW_DT)
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help
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This provides some extra DT physmap parsing for the ARM Versatile
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platforms, basically to add a VPP (write protection) callback so
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the flash can be taken out of write protection.
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config MTD_PMC_MSP_EVM
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tristate "CFI Flash device mapped on PMC-Sierra MSP"
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depends on PMC_MSP && MTD_CFI
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@ -18,6 +18,7 @@ obj-$(CONFIG_MTD_TSUNAMI) += tsunami_flash.o
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obj-$(CONFIG_MTD_PXA2XX) += pxa2xx-flash.o
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obj-$(CONFIG_MTD_PHYSMAP) += physmap.o
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obj-$(CONFIG_MTD_PHYSMAP_OF) += physmap_of.o
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obj-$(CONFIG_MTD_PHYSMAP_OF_VERSATILE) += physmap_of_versatile.o
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obj-$(CONFIG_MTD_PISMO) += pismo.o
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obj-$(CONFIG_MTD_PMC_MSP_EVM) += pmcmsp-flash.o
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obj-$(CONFIG_MTD_PCMCIA) += pcmciamtd.o
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@ -24,6 +24,7 @@
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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#include "physmap_of_versatile.h"
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struct of_flash_list {
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struct mtd_info *mtd;
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@ -240,6 +241,11 @@ static int of_flash_probe(struct platform_device *dev)
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info->list[i].map.size = res_size;
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info->list[i].map.bankwidth = be32_to_cpup(width);
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info->list[i].map.device_node = dp;
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err = of_flash_probe_versatile(dev, dp, &info->list[i].map);
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if (err) {
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dev_err(&dev->dev, "Can't probe Versatile VPP\n");
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return err;
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}
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err = -ENOMEM;
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info->list[i].map.virt = ioremap(info->list[i].map.phys,
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@ -0,0 +1,253 @@
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/*
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* Versatile OF physmap driver add-on
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*
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* Copyright (c) 2016, Linaro Limited
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/mtd/map.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/bitops.h>
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#include "physmap_of_versatile.h"
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static struct regmap *syscon_regmap;
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enum versatile_flashprot {
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INTEGRATOR_AP_FLASHPROT,
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INTEGRATOR_CP_FLASHPROT,
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VERSATILE_FLASHPROT,
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REALVIEW_FLASHPROT,
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};
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static const struct of_device_id syscon_match[] = {
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{
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.compatible = "arm,integrator-ap-syscon",
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.data = (void *)INTEGRATOR_AP_FLASHPROT,
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},
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{
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.compatible = "arm,integrator-cp-syscon",
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.data = (void *)INTEGRATOR_CP_FLASHPROT,
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},
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{
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.compatible = "arm,core-module-versatile",
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.data = (void *)VERSATILE_FLASHPROT,
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},
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{
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.compatible = "arm,realview-eb-syscon",
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.data = (void *)REALVIEW_FLASHPROT,
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},
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{
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.compatible = "arm,realview-pb1176-syscon",
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.data = (void *)REALVIEW_FLASHPROT,
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},
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{
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.compatible = "arm,realview-pb11mp-syscon",
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.data = (void *)REALVIEW_FLASHPROT,
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},
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{
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.compatible = "arm,realview-pba8-syscon",
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.data = (void *)REALVIEW_FLASHPROT,
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},
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{
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.compatible = "arm,realview-pbx-syscon",
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.data = (void *)REALVIEW_FLASHPROT,
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},
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{},
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};
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/*
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* Flash protection handling for the Integrator/AP
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*/
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#define INTEGRATOR_SC_CTRLS_OFFSET 0x08
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#define INTEGRATOR_SC_CTRLC_OFFSET 0x0C
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#define INTEGRATOR_SC_CTRL_FLVPPEN BIT(1)
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#define INTEGRATOR_SC_CTRL_FLWP BIT(2)
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#define INTEGRATOR_EBI_CSR1_OFFSET 0x04
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/* The manual says bit 2, the code says bit 3, trust the code */
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#define INTEGRATOR_EBI_WRITE_ENABLE BIT(3)
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#define INTEGRATOR_EBI_LOCK_OFFSET 0x20
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#define INTEGRATOR_EBI_LOCK_VAL 0xA05F
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static const struct of_device_id ebi_match[] = {
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{ .compatible = "arm,external-bus-interface"},
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{ },
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};
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static int ap_flash_init(struct platform_device *pdev)
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{
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struct device_node *ebi;
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static void __iomem *ebi_base;
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u32 val;
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int ret;
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/* Look up the EBI */
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ebi = of_find_matching_node(NULL, ebi_match);
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if (!ebi) {
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return -ENODEV;
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}
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ebi_base = of_iomap(ebi, 0);
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if (!ebi_base)
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return -ENODEV;
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/* Clear VPP and write protection bits */
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ret = regmap_write(syscon_regmap,
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INTEGRATOR_SC_CTRLC_OFFSET,
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INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP);
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if (ret)
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dev_err(&pdev->dev, "error clearing Integrator VPP/WP\n");
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/* Unlock the EBI */
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writel(INTEGRATOR_EBI_LOCK_VAL, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
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/* Enable write cycles on the EBI, CSR1 (flash) */
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val = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
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val |= INTEGRATOR_EBI_WRITE_ENABLE;
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writel(val, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
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/* Lock the EBI again */
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writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
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iounmap(ebi_base);
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return 0;
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}
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static void ap_flash_set_vpp(struct map_info *map, int on)
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{
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int ret;
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if (on) {
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ret = regmap_write(syscon_regmap,
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INTEGRATOR_SC_CTRLS_OFFSET,
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INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP);
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if (ret)
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pr_err("error enabling AP VPP\n");
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} else {
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ret = regmap_write(syscon_regmap,
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INTEGRATOR_SC_CTRLC_OFFSET,
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INTEGRATOR_SC_CTRL_FLVPPEN | INTEGRATOR_SC_CTRL_FLWP);
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if (ret)
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pr_err("error disabling AP VPP\n");
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}
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}
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/*
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* Flash protection handling for the Integrator/CP
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*/
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#define INTCP_FLASHPROG_OFFSET 0x04
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#define CINTEGRATOR_FLVPPEN BIT(0)
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#define CINTEGRATOR_FLWREN BIT(1)
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#define CINTEGRATOR_FLMASK BIT(0)|BIT(1)
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static void cp_flash_set_vpp(struct map_info *map, int on)
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{
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int ret;
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if (on) {
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ret = regmap_update_bits(syscon_regmap,
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INTCP_FLASHPROG_OFFSET,
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CINTEGRATOR_FLMASK,
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CINTEGRATOR_FLVPPEN | CINTEGRATOR_FLWREN);
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if (ret)
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pr_err("error setting CP VPP\n");
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} else {
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ret = regmap_update_bits(syscon_regmap,
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INTCP_FLASHPROG_OFFSET,
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CINTEGRATOR_FLMASK,
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0);
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if (ret)
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pr_err("error setting CP VPP\n");
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}
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}
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/*
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* Flash protection handling for the Versatiles and RealViews
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*/
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#define VERSATILE_SYS_FLASH_OFFSET 0x4C
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static void versatile_flash_set_vpp(struct map_info *map, int on)
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{
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int ret;
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ret = regmap_update_bits(syscon_regmap, VERSATILE_SYS_FLASH_OFFSET,
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0x01, !!on);
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if (ret)
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pr_err("error setting Versatile VPP\n");
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}
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int of_flash_probe_versatile(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map)
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{
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struct device_node *sysnp;
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const struct of_device_id *devid;
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struct regmap *rmap;
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static enum versatile_flashprot versatile_flashprot;
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int ret;
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/* Not all flash chips use this protection line */
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if (!of_device_is_compatible(np, "arm,versatile-flash"))
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return 0;
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/* For first chip probed, look up the syscon regmap */
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if (!syscon_regmap) {
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sysnp = of_find_matching_node_and_match(NULL,
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syscon_match,
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&devid);
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if (!sysnp)
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return -ENODEV;
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versatile_flashprot = (enum versatile_flashprot)devid->data;
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rmap = syscon_node_to_regmap(sysnp);
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if (IS_ERR(rmap))
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return PTR_ERR(rmap);
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syscon_regmap = rmap;
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}
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switch (versatile_flashprot) {
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case INTEGRATOR_AP_FLASHPROT:
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ret = ap_flash_init(pdev);
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if (ret)
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return ret;
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map->set_vpp = ap_flash_set_vpp;
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dev_info(&pdev->dev, "Integrator/AP flash protection\n");
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break;
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case INTEGRATOR_CP_FLASHPROT:
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map->set_vpp = cp_flash_set_vpp;
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dev_info(&pdev->dev, "Integrator/CP flash protection\n");
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break;
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case VERSATILE_FLASHPROT:
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case REALVIEW_FLASHPROT:
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map->set_vpp = versatile_flash_set_vpp;
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dev_info(&pdev->dev, "versatile/realview flash protection\n");
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break;
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default:
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dev_info(&pdev->dev, "device marked as Versatile flash "
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"but no system controller was found\n");
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break;
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}
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return 0;
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}
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@ -0,0 +1,16 @@
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#include <linux/of.h>
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#include <linux/mtd/map.h>
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#ifdef CONFIG_MTD_PHYSMAP_OF_VERSATILE
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int of_flash_probe_versatile(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map);
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#else
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static inline
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int of_flash_probe_versatile(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map)
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{
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return 0;
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}
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#endif
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