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240 lines
5.6 KiB
240 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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 <[email protected]> |
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*/ |
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#include <linux/export.h> |
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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-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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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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