--- /dev/null
+/*
+ * drivers/mtd/nand/cs553x_nand.c
+ *
+ * (C) 2005, 2006 Red Hat Inc.
+ *
+ * Author: David Woodhouse <dwmw2@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Overview:
+ * This is a device driver for the NAND flash controller found on
+ * the AMD CS5535/CS5536 companion chipsets for the Geode processor.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/msr.h>
+#include <asm/io.h>
+
+#define NR_CS553X_CONTROLLERS 4
+
+/* NAND Timing MSRs */
+#define MSR_NANDF_DATA 0x5140001b /* NAND Flash Data Timing MSR */
+#define MSR_NANDF_CTL 0x5140001c /* NAND Flash Control Timing */
+#define MSR_NANDF_RSVD 0x5140001d /* Reserved */
+
+/* NAND BAR MSRs */
+#define MSR_DIVIL_LBAR_FLSH0 0x51400010 /* Flash Chip Select 0 */
+#define MSR_DIVIL_LBAR_FLSH1 0x51400011 /* Flash Chip Select 1 */
+#define MSR_DIVIL_LBAR_FLSH2 0x51400012 /* Flash Chip Select 2 */
+#define MSR_DIVIL_LBAR_FLSH3 0x51400013 /* Flash Chip Select 3 */
+ /* Each made up of... */
+#define FLSH_LBAR_EN (1ULL<<32)
+#define FLSH_NOR_NAND (1ULL<<33) /* 1 for NAND */
+#define FLSH_MEM_IO (1ULL<<34) /* 1 for MMIO */
+ /* I/O BARs have BASE_ADDR in bits 15:4, IO_MASK in 47:36 */
+ /* MMIO BARs have BASE_ADDR in bits 31:12, MEM_MASK in 63:44 */
+
+/* Pin function selection MSR (IDE vs. flash on the IDE pins) */
+#define MSR_DIVIL_BALL_OPTS 0x51400015
+#define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */
+
+/* Registers within the NAND flash controller BAR -- memory mapped */
+#define MM_NAND_DATA 0x00 /* 0 to 0x7ff, in fact */
+#define MM_NAND_CTL 0x800 /* Any even address 0x800-0x80e */
+#define MM_NAND_IO 0x801 /* Any odd address 0x801-0x80f */
+#define MM_NAND_STS 0x810
+#define MM_NAND_ECC_LSB 0x811
+#define MM_NAND_ECC_MSB 0x812
+#define MM_NAND_ECC_COL 0x813
+#define MM_NAND_LAC 0x814
+#define MM_NAND_ECC_CTL 0x815
+
+/* Registers within the NAND flash controller BAR -- I/O mapped */
+#define IO_NAND_DATA 0x00 /* 0 to 3, in fact */
+#define IO_NAND_CTL 0x04
+#define IO_NAND_IO 0x05
+#define IO_NAND_STS 0x06
+#define IO_NAND_ECC_CTL 0x08
+#define IO_NAND_ECC_LSB 0x09
+#define IO_NAND_ECC_MSB 0x0a
+#define IO_NAND_ECC_COL 0x0b
+#define IO_NAND_LAC 0x0c
+
+#define CS_NAND_CTL_DIST_EN (1<<4) /* Enable NAND Distract interrupt */
+#define CS_NAND_CTL_RDY_INT_MASK (1<<3) /* Enable RDY/BUSY# interrupt */
+#define CS_NAND_CTL_ALE (1<<2)
+#define CS_NAND_CTL_CLE (1<<1)
+#define CS_NAND_CTL_CE (1<<0) /* Keep low; 1 to reset */
+
+#define CS_NAND_STS_FLASH_RDY (1<<3)
+#define CS_NAND_CTLR_BUSY (1<<2)
+#define CS_NAND_CMD_COMP (1<<1)
+#define CS_NAND_DIST_ST (1<<0)
+
+#define CS_NAND_ECC_PARITY (1<<2)
+#define CS_NAND_ECC_CLRECC (1<<1)
+#define CS_NAND_ECC_ENECC (1<<0)
+
+static unsigned char cs553x_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ unsigned char foo = readb(this->IO_ADDR_R);
+ return foo;
+}
+
+static void cs553x_write_byte(struct mtd_info *mtd, u_char byte)
+{
+ struct nand_chip *this = mtd->priv;
+ int i = 100000;
+
+ while (i && readb(this->IO_ADDR_R + MM_NAND_STS) & CS_NAND_CTLR_BUSY) {
+ udelay(1);
+ i--;
+ }
+ writeb(byte, this->IO_ADDR_W+0x801);
+}
+
+static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+ struct nand_chip *this = mtd->priv;
+ void __iomem *mmio_base = this->IO_ADDR_R;
+
+ uint8_t old = readb(mmio_base + MM_NAND_CTL);
+
+ switch(cmd) {
+ case NAND_CTL_SETCLE:
+ old |= CS_NAND_CTL_CLE;
+ break;
+
+ case NAND_CTL_CLRCLE:
+ old &= ~CS_NAND_CTL_CLE;
+ break;
+
+ case NAND_CTL_SETALE:
+ old |= CS_NAND_CTL_ALE;
+ break;
+
+ case NAND_CTL_CLRALE:
+ old &= ~CS_NAND_CTL_ALE;
+ break;
+
+ case NAND_CTL_SETNCE:
+ old &= ~CS_NAND_CTL_CE;
+ break;
+
+ case NAND_CTL_CLRNCE:
+ old |= CS_NAND_CTL_CE;
+ break;
+ }
+ writeb(old, mmio_base + MM_NAND_CTL);
+}
+
+
+static int cs553x_device_ready(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ void __iomem *mmio_base = this->IO_ADDR_R;
+ unsigned char foo = readb(mmio_base + MM_NAND_STS);
+
+ return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY);
+}
+
+static struct mtd_info *cs553x_mtd[4];
+
+static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
+{
+ int err = 0;
+ struct nand_chip *this;
+ struct mtd_info *new_mtd;
+
+ printk(KERN_NOTICE "Probing CS553x NAND controller CS#%d at %sIO 0x%08lx\n", cs, mmio?"MM":"P", adr);
+
+ if (!mmio) {
+ printk(KERN_NOTICE "PIO mode not yet implemented for CS553X NAND controller\n");
+ return -ENXIO;
+ }
+
+ /* Allocate memory for MTD device structure and private data */
+ new_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), GFP_KERNEL);
+ if (!new_mtd) {
+ printk(KERN_WARNING "Unable to allocate CS553X NAND MTD device structure.\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* Get pointer to private data */
+ this = (struct nand_chip *) (&new_mtd[1]);
+
+ /* Initialize structures */
+ memset((char *) new_mtd, 0, sizeof(struct mtd_info));
+ memset((char *) this, 0, sizeof(struct nand_chip));
+
+ /* Link the private data with the MTD structure */
+ new_mtd->priv = this;
+
+ /* map physical address */
+ this->IO_ADDR_R = this->IO_ADDR_W = ioremap(adr, 4096);
+ if (!this->IO_ADDR_R) {
+ printk(KERN_WARNING "ioremap cs553x NAND @0x%08lx failed\n", adr);
+ err = -EIO;
+ goto out_mtd;
+ }
+
+ this->hwcontrol = cs553x_hwcontrol;
+ this->dev_ready = cs553x_device_ready;
+ this->read_byte = cs553x_read_byte;
+ this->write_byte = cs553x_write_byte;
+
+ /* 20 us command delay time */
+ this->chip_delay = 20;
+ this->eccmode = NAND_ECC_SOFT;
+
+ /* Enable the following for a flash based bad block table */
+ // this->options = NAND_USE_FLASH_BBT;
+
+ /* Scan to find existance of the device */
+ if (nand_scan (new_mtd, 1)) {
+ err = -ENXIO;
+ goto out_ior;
+ }
+
+ cs553x_mtd[cs] = new_mtd;
+ goto out;
+
+out_ior:
+ iounmap((void *)this->IO_ADDR_R);
+out_mtd:
+ kfree (new_mtd);
+out:
+ return err;
+}
+
+int __init cs553x_init(void)
+{
+ int err = -ENXIO;
+ int i;
+ uint64_t val;
+
+ /* Check whether we actually have a CS5535 or CS5536 */
+ if (!pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, NULL) &&
+ !pci_find_device(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA, NULL))
+ return -ENXIO;
+
+ rdmsrl(MSR_DIVIL_BALL_OPTS, val);
+ if (val & 1) {
+ printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n");
+ return -ENXIO;
+ }
+
+ for (i=0; i<NR_CS553X_CONTROLLERS; i++) {
+ rdmsrl(MSR_DIVIL_LBAR_FLSH0+i, val);
+
+ if ((val & (FLSH_LBAR_EN|FLSH_NOR_NAND)) == (FLSH_LBAR_EN|FLSH_NOR_NAND))
+ err = cs553x_init_one(i, !!(val & FLSH_MEM_IO), val & 0xFFFFFFFF);
+ }
+
+ /* Register all devices together here. This means we can easily hack it to
+ do mtdconcat etc. if we want to. */
+ for (i=0; i<NR_CS553X_CONTROLLERS; i++) {
+ if (cs553x_mtd[i]) {
+ add_mtd_device(cs553x_mtd[i]);
+
+ /* If any devices registered, return success. Else the last error. */
+ err = 0;
+ }
+ }
+
+ return err;
+}
+module_init(cs553x_init);
+
+static void __exit cs553x_cleanup (void)
+{
+ int i;
+
+ for (i=0; i<NR_CS553X_CONTROLLERS; i++) {
+ struct mtd_info *mtd = cs553x_mtd[i];
+ struct nand_chip *this;
+ void __iomem *mmio_base;
+
+ if (!mtd)
+ break;
+
+ this = cs553x_mtd[i]->priv;
+ mmio_base = this->IO_ADDR_R;
+
+ /* Release resources, unregister device */
+ nand_release (cs553x_mtd[i]);
+ cs553x_mtd[i] = NULL;
+
+ /* unmap physical adress */
+ iounmap(mmio_base);
+
+ /* Free the MTD device structure */
+ kfree (mtd);
+ }
+}
+module_exit(cs553x_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip");
projects / linux-2.6 / commitdiff