SCx200 patches part 2/3 -- Flash driver

From: Christer Weinigel (wingel@nano-system.com)
Date: Sun Jun 30 2002 - 08:48:05 EST


This is the second part of the SCx200 patches. This patch adds
support for a flash chip connected to the DOCCS chip select.

The patch is generated against a 2.4.19-pre10 kernel with the previous
patch since it needs the header file changes.

    /Christer

diff -urw ./linux/Documentation/Configure.help.orig ./linux/Documentation/Configure.help
--- ./linux/Documentation/Configure.help.orig Sun Jun 30 14:46:24 2002
+++ ./linux/Documentation/Configure.help Sun Jun 30 14:45:59 2002
@@ -24989,6 +24989,15 @@
 
   If compiled as a module, it will be called scx200_watchdog.o.
 
+Flash device mapped with DOCCS on NatSemi SCx200
+CONFIG_MTD_SCx200_DOCFLASH
+ Enable support for a flash chip mapped using the DOCCS signal on a
+ National Semiconductor SCx200 processor.
+
+ If you don't know what to do here, say N.
+
+ If compiled as a module, it will be called scx200_docflash.o.
+
 #
 # A couple of things I keep forgetting:
 # capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet,
--- ./linux/drivers/mtd/maps/Config.in.orig Sun Jun 30 14:40:12 2002
+++ ./linux/drivers/mtd/maps/Config.in Sun Jun 30 14:40:14 2002
@@ -30,6 +30,8 @@
    dep_tristate ' JEDEC Flash device mapped on Mixcom piggyback card' CONFIG_MTD_MIXMEM $CONFIG_MTD_JEDEC
    dep_tristate ' JEDEC Flash device mapped on Octagon 5066 SBC' CONFIG_MTD_OCTAGON $CONFIG_MTD_JEDEC
    dep_tristate ' JEDEC Flash device mapped on Tempustech VMAX SBC301' CONFIG_MTD_VMAX $CONFIG_MTD_JEDEC
+ dep_tristate ' BIOS flash chip on Intel L440GX boards' CONFIG_MTD_L440GX $CONFIG_I386 $CONFIG_MTD_JEDEC
+ dep_tristate ' Flash device mapped with DOCCS on NatSemi SCx200' CONFIG_MTD_SCx200_DOCFLASH $CONFIG_MTD_CFI
    dep_tristate ' BIOS flash chip on Intel L440GX boards' CONFIG_MTD_L440GX $CONFIG_MTD_JEDECPROBE
    dep_tristate ' ROM connected to AMD766 southbridge' CONFIG_MTD_AMD766ROM $CONFIG_MTD_GEN_PROBE
    dep_tristate ' ROM connected to Intel Hub Controller 2' CONFIG_MTD_ICH2ROM $CONFIG_MTD_JEDECPROBE
diff -urw ./linux/drivers/mtd/maps/Makefile.orig ./linux/drivers/mtd/maps/Makefile
--- ./linux/drivers/mtd/maps/Makefile.orig Sun Jun 30 14:40:12 2002
+++ ./linux/drivers/mtd/maps/Makefile Sun Jun 30 14:40:14 2002
@@ -38,6 +38,7 @@
 obj-$(CONFIG_MTD_PCI) += pci.o
 obj-$(CONFIG_MTD_PB1000) += pb1xxx-flash.o
 obj-$(CONFIG_MTD_PB1500) += pb1xxx-flash.o
+obj-$(CONFIG_MTD_SCx200_DOCFLASH)+= scx200_docflash.o
 obj-$(CONFIG_MTD_AUTCPU12) += autcpu12-nvram.o
 
 include $(TOPDIR)/Rules.make
diff -urw ./linux/drivers/mtd/maps/scx200_docflash.c.orig ./linux/drivers/mtd/maps/scx200_docflash.c
--- ./linux/drivers/mtd/maps/scx200_docflash.c.orig Sun Jun 30 14:40:14 2002
+++ ./linux/drivers/mtd/maps/scx200_docflash.c Sun Jun 30 15:05:55 2002
@@ -0,0 +1,266 @@
+/* linux/drivers/mtd/maps/scx200_docflash.c
+
+ Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
+
+ National Semiconductor SCx200 flash mapped with DOCCS
+*/
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/pci.h>
+#include <linux/scx200.h>
+
+#define NAME "scx200_docflash"
+
+MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
+MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
+MODULE_LICENSE("GPL");
+
+/* Set this to one if you want to partition the flash */
+#define PARTITION 0
+
+MODULE_PARM(probe, "i");
+MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
+MODULE_PARM(size, "i");
+MODULE_PARM_DESC(size, "Size of the flash mapping");
+MODULE_PARM(width, "i");
+MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
+MODULE_PARM(flashtype, "s");
+MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
+
+static int probe = 0; /* Don't autoprobe */
+static unsigned size = 0x1000000; /* 16 MB the whole ISA address space */
+static unsigned width = 8; /* Default to 8 bits wide */
+static char *flashtype = "cfi_probe";
+
+static struct resource docmem = {
+ flags : IORESOURCE_MEM,
+ name : "NatSemi SCx200 DOCCS Flash",
+};
+
+static struct mtd_info *mymtd;
+
+#if PARTITION
+static struct mtd_partition partition_info[] = {
+ {
+ name: "DOCCS Boot kernel",
+ offset: 0,
+ size: 0xc0000
+ },
+ {
+ name: "DOCCS Low BIOS",
+ offset: 0xc0000,
+ size: 0x40000
+ },
+ {
+ name: "DOCCS File system",
+ offset: 0x100000,
+ size: ~0 /* calculate from flash size */
+ },
+ {
+ name: "DOCCS High BIOS",
+ offset: ~0, /* calculate from flash size */
+ size: 0x80000
+ },
+};
+#define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
+#endif
+
+static __u8 scx200_docflash_read8(struct map_info *map, unsigned long ofs)
+{
+ return __raw_readb(map->map_priv_1 + ofs);
+}
+
+static __u16 scx200_docflash_read16(struct map_info *map, unsigned long ofs)
+{
+ return __raw_readw(map->map_priv_1 + ofs);
+}
+
+static void scx200_docflash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+ memcpy_fromio(to, map->map_priv_1 + from, len);
+}
+
+static void scx200_docflash_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+ __raw_writeb(d, map->map_priv_1 + adr);
+ mb();
+}
+
+static void scx200_docflash_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+ __raw_writew(d, map->map_priv_1 + adr);
+ mb();
+}
+
+static void scx200_docflash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+ memcpy_toio(map->map_priv_1 + to, from, len);
+}
+
+static struct map_info scx200_docflash_map = {
+ name: "NatSemi SCx200 DOCCS Flash",
+ read8: scx200_docflash_read8,
+ read16: scx200_docflash_read16,
+ copy_from: scx200_docflash_copy_from,
+ write8: scx200_docflash_write8,
+ write16: scx200_docflash_write16,
+ copy_to: scx200_docflash_copy_to
+};
+
+int __init init_scx200_docflash(void)
+{
+ unsigned u;
+ unsigned base;
+ unsigned ctrl;
+ unsigned pmr;
+ struct pci_dev *bridge;
+
+ printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
+
+ if ((bridge = pci_find_device(PCI_VENDOR_ID_NS,
+ PCI_DEVICE_ID_NS_SCx200_BRIDGE,
+ NULL)) == NULL)
+ return -ENODEV;
+
+ if (!scx200_cb_probe(SCx200_CB_BASE)) {
+ printk(KERN_WARNING NAME ": no configuration block found\n");
+ return -ENODEV;
+ }
+
+ if (probe) {
+ /* Try to use the present flash mapping if any */
+ pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
+ pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
+ pmr = inl(SCx200_CB_BASE + SCx200_PMR);
+
+ if (base == 0
+ || (ctrl & 0x07000000) != 0x07000000
+ || (ctrl & 0x0007ffff) == 0)
+ return -ENODEV;
+
+ size = ((ctrl&0x1fff)<<13) + (1<<13);
+
+ for (u = size; u > 1; u >>= 1)
+ ;
+ if (u != 1)
+ return -ENODEV;
+
+ if (pmr & (1<<6))
+ width = 16;
+ else
+ width = 8;
+
+ docmem.start = base;
+ docmem.end = base + size;
+
+ if (request_resource(&iomem_resource, &docmem)) {
+ printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
+ return -ENOMEM;
+ }
+ } else {
+ for (u = size; u > 1; u >>= 1)
+ ;
+ if (u != 1) {
+ printk(KERN_ERR NAME ": invalid size for flash mapping\n");
+ return -EINVAL;
+ }
+
+ if (width != 8 && width != 16) {
+ printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
+ return -EINVAL;
+ }
+
+ if (allocate_resource(&iomem_resource, &docmem,
+ size,
+ 0x80000000, 0xffffffff,
+ size, NULL, NULL)) {
+ printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
+ return -ENOMEM;
+ }
+
+ ctrl = 0x07000000 | (size >> 13);
+
+ pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
+ pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
+ pmr = inl(SCx200_CB_BASE + SCx200_PMR);
+
+ if (width == 8) {
+ pmr &= ~(1<<6);
+ } else {
+ pmr |= (1<<6);
+ }
+ outl(pmr, SCx200_CB_BASE + SCx200_PMR);
+ }
+
+ printk(KERN_INFO NAME ": DOCCS mapped at 0x%lx-0x%lx, width %d\n",
+ docmem.start, docmem.end, width);
+
+ scx200_docflash_map.size = size;
+ if (width == 8)
+ scx200_docflash_map.buswidth = 1;
+ else
+ scx200_docflash_map.buswidth = 2;
+
+ scx200_docflash_map.map_priv_1 = (unsigned long)ioremap(docmem.start, scx200_docflash_map.size);
+ if (!scx200_docflash_map.map_priv_1) {
+ printk(KERN_ERR NAME ": failed to ioremap the flash\n");
+ release_resource(&docmem);
+ return -EIO;
+ }
+
+ mymtd = do_map_probe(flashtype, &scx200_docflash_map);
+ if (!mymtd) {
+ printk(KERN_ERR NAME ": unable to detect flash\n");
+ iounmap((void *)scx200_docflash_map.map_priv_1);
+ release_resource(&docmem);
+ return -ENXIO;
+ }
+
+ if (size < mymtd->size)
+ printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
+
+ mymtd->module = THIS_MODULE;
+
+#if PARTITION
+ partition_info[3].offset = mymtd->size-partition_info[3].size;
+ partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
+ add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
+#else
+ add_mtd_device(mymtd);
+#endif
+ return 0;
+}
+
+static void __exit cleanup_scx200_docflash(void)
+{
+ if (mymtd) {
+#if PARTITION
+ del_mtd_partitions(mymtd);
+#else
+ del_mtd_device(mymtd);
+#endif
+ map_destroy(mymtd);
+ }
+ if (scx200_docflash_map.map_priv_1) {
+ iounmap((void *)scx200_docflash_map.map_priv_1);
+ release_resource(&docmem);
+ }
+}
+
+module_init(init_scx200_docflash);
+module_exit(cleanup_scx200_docflash);
+
+/*
+ Local variables:
+ compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
+ c-basic-offset: 8
+ End:
+*/

-- 
"Just how much can I get away with and still go to heaven?"
-
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This archive was generated by hypermail 2b29 : Sun Jun 30 2002 - 22:00:14 EST