Message-Id: <20231208224703.1603264-2-willy@infradead.org>
Date:   Fri,  8 Dec 2023 22:47:03 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-fbdev@...r.kernel.org, linux-mtd@...ts.infradead.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Richard Weinberger <richard@....at>,
        Lee Jones <lee@...nel.org>, Andy Lowe <alowe@...sta.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Alan Hourihane <alanh@...rlite.co.uk>
Subject: [PATCH 2/2] mtd: Remove support for Carillo Ranch driver

As far as anybody can tell, this product never shipped.  If it did,
it shipped in 2007 and nobody has access to one any more.  Remove the
mtd NOR driver.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 drivers/mtd/maps/Kconfig        |   7 -
 drivers/mtd/maps/Makefile       |   1 -
 drivers/mtd/maps/intel_vr_nor.c | 265 --------------------------------
 3 files changed, 273 deletions(-)
 delete mode 100644 drivers/mtd/maps/intel_vr_nor.c

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index e098ae937ce8..8a8b19874e23 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -341,13 +341,6 @@ config MTD_UCLINUX
 	help
 	  Map driver to support image based filesystems for uClinux.
 
-config MTD_INTEL_VR_NOR
-	tristate "NOR flash on Intel Vermilion Range Expansion Bus CS0"
-	depends on PCI
-	help
-	  Map driver for a NOR flash bank located on the Expansion Bus of the
-	  Intel Vermilion Range chipset.
-
 config MTD_PLATRAM
 	tristate "Map driver for platform device RAM (mtd-ram)"
 	select MTD_RAM
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 094cfb244086..a9083c888e3b 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -40,6 +40,5 @@ obj-$(CONFIG_MTD_UCLINUX)	+= uclinux.o
 obj-$(CONFIG_MTD_NETtel)	+= nettel.o
 obj-$(CONFIG_MTD_SCB2_FLASH)	+= scb2_flash.o
 obj-$(CONFIG_MTD_PLATRAM)	+= plat-ram.o
-obj-$(CONFIG_MTD_INTEL_VR_NOR)	+= intel_vr_nor.o
 obj-$(CONFIG_MTD_VMU)		+= vmu-flash.o
 obj-$(CONFIG_MTD_LANTIQ)	+= lantiq-flash.o
diff --git a/drivers/mtd/maps/intel_vr_nor.c b/drivers/mtd/maps/intel_vr_nor.c
deleted file mode 100644
index d67b845b0e89..000000000000
--- a/drivers/mtd/maps/intel_vr_nor.c
+++ /dev/null
@@ -1,265 +0,0 @@
-/*
- * drivers/mtd/maps/intel_vr_nor.c
- *
- * An MTD map driver for a NOR flash bank on the Expansion Bus of the Intel
- * Vermilion Range chipset.
- *
- * The Vermilion Range Expansion Bus supports four chip selects, each of which
- * has 64MiB of address space.  The 2nd BAR of the Expansion Bus PCI Device
- * is a 256MiB memory region containing the address spaces for all four of the
- * chip selects, with start addresses hardcoded on 64MiB boundaries.
- *
- * This map driver only supports NOR flash on chip select 0.  The buswidth
- * (either 8 bits or 16 bits) is determined by reading the Expansion Bus Timing
- * and Control Register for Chip Select 0 (EXP_TIMING_CS0).  This driver does
- * not modify the value in the EXP_TIMING_CS0 register except to enable writing
- * and disable boot acceleration.  The timing parameters in the register are
- * assumed to have been properly initialized by the BIOS.  The reset default
- * timing parameters are maximally conservative (slow), so access to the flash
- * will be slower than it should be if the BIOS has not initialized the timing
- * parameters.
- *
- * Author: Andy Lowe <alowe@...sta.com>
- *
- * 2006 (c) MontaVista Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/pci.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/map.h>
-#include <linux/mtd/partitions.h>
-#include <linux/mtd/cfi.h>
-#include <linux/mtd/flashchip.h>
-
-#define DRV_NAME "vr_nor"
-
-struct vr_nor_mtd {
-	void __iomem *csr_base;
-	struct map_info map;
-	struct mtd_info *info;
-	struct pci_dev *dev;
-};
-
-/* Expansion Bus Configuration and Status Registers are in BAR 0 */
-#define EXP_CSR_MBAR 0
-/* Expansion Bus Memory Window is BAR 1 */
-#define EXP_WIN_MBAR 1
-/* Maximum address space for Chip Select 0 is 64MiB */
-#define CS0_SIZE 0x04000000
-/* Chip Select 0 is at offset 0 in the Memory Window */
-#define CS0_START 0x0
-/* Chip Select 0 Timing Register is at offset 0 in CSR */
-#define EXP_TIMING_CS0 0x00
-#define TIMING_CS_EN		(1 << 31)	/* Chip Select Enable */
-#define TIMING_BOOT_ACCEL_DIS	(1 <<  8)	/* Boot Acceleration Disable */
-#define TIMING_WR_EN		(1 <<  1)	/* Write Enable */
-#define TIMING_BYTE_EN		(1 <<  0)	/* 8-bit vs 16-bit bus */
-#define TIMING_MASK		0x3FFF0000
-
-static void vr_nor_destroy_partitions(struct vr_nor_mtd *p)
-{
-	mtd_device_unregister(p->info);
-}
-
-static int vr_nor_init_partitions(struct vr_nor_mtd *p)
-{
-	/* register the flash bank */
-	/* partition the flash bank */
-	return mtd_device_register(p->info, NULL, 0);
-}
-
-static void vr_nor_destroy_mtd_setup(struct vr_nor_mtd *p)
-{
-	map_destroy(p->info);
-}
-
-static int vr_nor_mtd_setup(struct vr_nor_mtd *p)
-{
-	static const char * const probe_types[] =
-	    { "cfi_probe", "jedec_probe", NULL };
-	const char * const *type;
-
-	for (type = probe_types; !p->info && *type; type++)
-		p->info = do_map_probe(*type, &p->map);
-	if (!p->info)
-		return -ENODEV;
-
-	p->info->dev.parent = &p->dev->dev;
-
-	return 0;
-}
-
-static void vr_nor_destroy_maps(struct vr_nor_mtd *p)
-{
-	unsigned int exp_timing_cs0;
-
-	/* write-protect the flash bank */
-	exp_timing_cs0 = readl(p->csr_base + EXP_TIMING_CS0);
-	exp_timing_cs0 &= ~TIMING_WR_EN;
-	writel(exp_timing_cs0, p->csr_base + EXP_TIMING_CS0);
-
-	/* unmap the flash window */
-	iounmap(p->map.virt);
-
-	/* unmap the csr window */
-	iounmap(p->csr_base);
-}
-
-/*
- * Initialize the map_info structure and map the flash.
- * Returns 0 on success, nonzero otherwise.
- */
-static int vr_nor_init_maps(struct vr_nor_mtd *p)
-{
-	unsigned long csr_phys, csr_len;
-	unsigned long win_phys, win_len;
-	unsigned int exp_timing_cs0;
-	int err;
-
-	csr_phys = pci_resource_start(p->dev, EXP_CSR_MBAR);
-	csr_len = pci_resource_len(p->dev, EXP_CSR_MBAR);
-	win_phys = pci_resource_start(p->dev, EXP_WIN_MBAR);
-	win_len = pci_resource_len(p->dev, EXP_WIN_MBAR);
-
-	if (!csr_phys || !csr_len || !win_phys || !win_len)
-		return -ENODEV;
-
-	if (win_len < (CS0_START + CS0_SIZE))
-		return -ENXIO;
-
-	p->csr_base = ioremap(csr_phys, csr_len);
-	if (!p->csr_base)
-		return -ENOMEM;
-
-	exp_timing_cs0 = readl(p->csr_base + EXP_TIMING_CS0);
-	if (!(exp_timing_cs0 & TIMING_CS_EN)) {
-		dev_warn(&p->dev->dev, "Expansion Bus Chip Select 0 "
-		       "is disabled.\n");
-		err = -ENODEV;
-		goto release;
-	}
-	if ((exp_timing_cs0 & TIMING_MASK) == TIMING_MASK) {
-		dev_warn(&p->dev->dev, "Expansion Bus Chip Select 0 "
-		       "is configured for maximally slow access times.\n");
-	}
-	p->map.name = DRV_NAME;
-	p->map.bankwidth = (exp_timing_cs0 & TIMING_BYTE_EN) ? 1 : 2;
-	p->map.phys = win_phys + CS0_START;
-	p->map.size = CS0_SIZE;
-	p->map.virt = ioremap(p->map.phys, p->map.size);
-	if (!p->map.virt) {
-		err = -ENOMEM;
-		goto release;
-	}
-	simple_map_init(&p->map);
-
-	/* Enable writes to flash bank */
-	exp_timing_cs0 |= TIMING_BOOT_ACCEL_DIS | TIMING_WR_EN;
-	writel(exp_timing_cs0, p->csr_base + EXP_TIMING_CS0);
-
-	return 0;
-
-      release:
-	iounmap(p->csr_base);
-	return err;
-}
-
-static const struct pci_device_id vr_nor_pci_ids[] = {
-	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x500D)},
-	{0,}
-};
-
-static void vr_nor_pci_remove(struct pci_dev *dev)
-{
-	struct vr_nor_mtd *p = pci_get_drvdata(dev);
-
-	vr_nor_destroy_partitions(p);
-	vr_nor_destroy_mtd_setup(p);
-	vr_nor_destroy_maps(p);
-	kfree(p);
-	pci_release_regions(dev);
-	pci_disable_device(dev);
-}
-
-static int vr_nor_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
-{
-	struct vr_nor_mtd *p = NULL;
-	unsigned int exp_timing_cs0;
-	int err;
-
-	err = pci_enable_device(dev);
-	if (err)
-		goto out;
-
-	err = pci_request_regions(dev, DRV_NAME);
-	if (err)
-		goto disable_dev;
-
-	p = kzalloc(sizeof(*p), GFP_KERNEL);
-	err = -ENOMEM;
-	if (!p)
-		goto release;
-
-	p->dev = dev;
-
-	err = vr_nor_init_maps(p);
-	if (err)
-		goto release;
-
-	err = vr_nor_mtd_setup(p);
-	if (err)
-		goto destroy_maps;
-
-	err = vr_nor_init_partitions(p);
-	if (err)
-		goto destroy_mtd_setup;
-
-	pci_set_drvdata(dev, p);
-
-	return 0;
-
-      destroy_mtd_setup:
-	map_destroy(p->info);
-
-      destroy_maps:
-	/* write-protect the flash bank */
-	exp_timing_cs0 = readl(p->csr_base + EXP_TIMING_CS0);
-	exp_timing_cs0 &= ~TIMING_WR_EN;
-	writel(exp_timing_cs0, p->csr_base + EXP_TIMING_CS0);
-
-	/* unmap the flash window */
-	iounmap(p->map.virt);
-
-	/* unmap the csr window */
-	iounmap(p->csr_base);
-
-      release:
-	kfree(p);
-	pci_release_regions(dev);
-
-      disable_dev:
-	pci_disable_device(dev);
-
-      out:
-	return err;
-}
-
-static struct pci_driver vr_nor_pci_driver = {
-	.name = DRV_NAME,
-	.probe = vr_nor_pci_probe,
-	.remove = vr_nor_pci_remove,
-	.id_table = vr_nor_pci_ids,
-};
-
-module_pci_driver(vr_nor_pci_driver);
-
-MODULE_AUTHOR("Andy Lowe");
-MODULE_DESCRIPTION("MTD map driver for NOR flash on Intel Vermilion Range");
-MODULE_LICENSE("GPL");
-MODULE_DEVICE_TABLE(pci, vr_nor_pci_ids);
-- 
2.42.0

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