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Diffstat (limited to 'drivers/mtd/nand/raw/cs553x_nand.c')
-rw-r--r--drivers/mtd/nand/raw/cs553x_nand.c427
1 files changed, 427 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/cs553x_nand.c b/drivers/mtd/nand/raw/cs553x_nand.c
new file mode 100644
index 000000000..282203deb
--- /dev/null
+++ b/drivers/mtd/nand/raw/cs553x_nand.c
@@ -0,0 +1,427 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (C) 2005, 2006 Red Hat Inc.
+ *
+ * Author: David Woodhouse <dwmw2@infradead.org>
+ * Tom Sylla <tom.sylla@amd.com>
+ *
+ * Overview:
+ * This is a device driver for the NAND flash controller found on
+ * the AMD CS5535/CS5536 companion chipsets for the Geode processor.
+ * mtd-id for command line partitioning is cs553x_nand_cs[0-3]
+ * where 0-3 reflects the chip select for NAND.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+#include <linux/iopoll.h>
+
+#include <asm/msr.h>
+
+#define NR_CS553X_CONTROLLERS 4
+
+#define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */
+#define CAP_CS5535 0x2df000ULL
+#define CAP_CS5536 0x5df500ULL
+
+/* 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)
+
+struct cs553x_nand_controller {
+ struct nand_controller base;
+ struct nand_chip chip;
+ void __iomem *mmio;
+};
+
+static struct cs553x_nand_controller *
+to_cs553x(struct nand_controller *controller)
+{
+ return container_of(controller, struct cs553x_nand_controller, base);
+}
+
+static int cs553x_write_ctrl_byte(struct cs553x_nand_controller *cs553x,
+ u32 ctl, u8 data)
+{
+ u8 status;
+ int ret;
+
+ writeb(ctl, cs553x->mmio + MM_NAND_CTL);
+ writeb(data, cs553x->mmio + MM_NAND_IO);
+ ret = readb_poll_timeout_atomic(cs553x->mmio + MM_NAND_STS, status,
+ !(status & CS_NAND_CTLR_BUSY), 1,
+ 100000);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void cs553x_data_in(struct cs553x_nand_controller *cs553x, void *buf,
+ unsigned int len)
+{
+ writeb(0, cs553x->mmio + MM_NAND_CTL);
+ while (unlikely(len > 0x800)) {
+ memcpy_fromio(buf, cs553x->mmio, 0x800);
+ buf += 0x800;
+ len -= 0x800;
+ }
+ memcpy_fromio(buf, cs553x->mmio, len);
+}
+
+static void cs553x_data_out(struct cs553x_nand_controller *cs553x,
+ const void *buf, unsigned int len)
+{
+ writeb(0, cs553x->mmio + MM_NAND_CTL);
+ while (unlikely(len > 0x800)) {
+ memcpy_toio(cs553x->mmio, buf, 0x800);
+ buf += 0x800;
+ len -= 0x800;
+ }
+ memcpy_toio(cs553x->mmio, buf, len);
+}
+
+static int cs553x_wait_ready(struct cs553x_nand_controller *cs553x,
+ unsigned int timeout_ms)
+{
+ u8 mask = CS_NAND_CTLR_BUSY | CS_NAND_STS_FLASH_RDY;
+ u8 status;
+
+ return readb_poll_timeout(cs553x->mmio + MM_NAND_STS, status,
+ (status & mask) == CS_NAND_STS_FLASH_RDY, 100,
+ timeout_ms * 1000);
+}
+
+static int cs553x_exec_instr(struct cs553x_nand_controller *cs553x,
+ const struct nand_op_instr *instr)
+{
+ unsigned int i;
+ int ret = 0;
+
+ switch (instr->type) {
+ case NAND_OP_CMD_INSTR:
+ ret = cs553x_write_ctrl_byte(cs553x, CS_NAND_CTL_CLE,
+ instr->ctx.cmd.opcode);
+ break;
+
+ case NAND_OP_ADDR_INSTR:
+ for (i = 0; i < instr->ctx.addr.naddrs; i++) {
+ ret = cs553x_write_ctrl_byte(cs553x, CS_NAND_CTL_ALE,
+ instr->ctx.addr.addrs[i]);
+ if (ret)
+ break;
+ }
+ break;
+
+ case NAND_OP_DATA_IN_INSTR:
+ cs553x_data_in(cs553x, instr->ctx.data.buf.in,
+ instr->ctx.data.len);
+ break;
+
+ case NAND_OP_DATA_OUT_INSTR:
+ cs553x_data_out(cs553x, instr->ctx.data.buf.out,
+ instr->ctx.data.len);
+ break;
+
+ case NAND_OP_WAITRDY_INSTR:
+ ret = cs553x_wait_ready(cs553x, instr->ctx.waitrdy.timeout_ms);
+ break;
+ }
+
+ if (instr->delay_ns)
+ ndelay(instr->delay_ns);
+
+ return ret;
+}
+
+static int cs553x_exec_op(struct nand_chip *this,
+ const struct nand_operation *op,
+ bool check_only)
+{
+ struct cs553x_nand_controller *cs553x = to_cs553x(this->controller);
+ unsigned int i;
+ int ret;
+
+ if (check_only)
+ return true;
+
+ /* De-assert the CE pin */
+ writeb(0, cs553x->mmio + MM_NAND_CTL);
+ for (i = 0; i < op->ninstrs; i++) {
+ ret = cs553x_exec_instr(cs553x, &op->instrs[i]);
+ if (ret)
+ break;
+ }
+
+ /* Re-assert the CE pin. */
+ writeb(CS_NAND_CTL_CE, cs553x->mmio + MM_NAND_CTL);
+
+ return ret;
+}
+
+static void cs_enable_hwecc(struct nand_chip *this, int mode)
+{
+ struct cs553x_nand_controller *cs553x = to_cs553x(this->controller);
+
+ writeb(0x07, cs553x->mmio + MM_NAND_ECC_CTL);
+}
+
+static int cs_calculate_ecc(struct nand_chip *this, const u_char *dat,
+ u_char *ecc_code)
+{
+ struct cs553x_nand_controller *cs553x = to_cs553x(this->controller);
+ uint32_t ecc;
+
+ ecc = readl(cs553x->mmio + MM_NAND_STS);
+
+ ecc_code[1] = ecc >> 8;
+ ecc_code[0] = ecc >> 16;
+ ecc_code[2] = ecc >> 24;
+ return 0;
+}
+
+static struct cs553x_nand_controller *controllers[4];
+
+static int cs553x_attach_chip(struct nand_chip *chip)
+{
+ if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST)
+ return 0;
+
+ chip->ecc.size = 256;
+ chip->ecc.bytes = 3;
+ chip->ecc.hwctl = cs_enable_hwecc;
+ chip->ecc.calculate = cs_calculate_ecc;
+ chip->ecc.correct = nand_correct_data;
+ chip->ecc.strength = 1;
+
+ return 0;
+}
+
+static const struct nand_controller_ops cs553x_nand_controller_ops = {
+ .exec_op = cs553x_exec_op,
+ .attach_chip = cs553x_attach_chip,
+};
+
+static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
+{
+ struct cs553x_nand_controller *controller;
+ int err = 0;
+ struct nand_chip *this;
+ struct mtd_info *new_mtd;
+
+ pr_notice("Probing CS553x NAND controller CS#%d at %sIO 0x%08lx\n",
+ cs, mmio ? "MM" : "P", adr);
+
+ if (!mmio) {
+ pr_notice("PIO mode not yet implemented for CS553X NAND controller\n");
+ return -ENXIO;
+ }
+
+ /* Allocate memory for MTD device structure and private data */
+ controller = kzalloc(sizeof(*controller), GFP_KERNEL);
+ if (!controller) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ this = &controller->chip;
+ nand_controller_init(&controller->base);
+ controller->base.ops = &cs553x_nand_controller_ops;
+ this->controller = &controller->base;
+ new_mtd = nand_to_mtd(this);
+
+ /* Link the private data with the MTD structure */
+ new_mtd->owner = THIS_MODULE;
+
+ /* map physical address */
+ controller->mmio = ioremap(adr, 4096);
+ if (!controller->mmio) {
+ pr_warn("ioremap cs553x NAND @0x%08lx failed\n", adr);
+ err = -EIO;
+ goto out_mtd;
+ }
+
+ /* Enable the following for a flash based bad block table */
+ this->bbt_options = NAND_BBT_USE_FLASH;
+
+ new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs);
+ if (!new_mtd->name) {
+ err = -ENOMEM;
+ goto out_ior;
+ }
+
+ /* Scan to find existence of the device */
+ err = nand_scan(this, 1);
+ if (err)
+ goto out_free;
+
+ controllers[cs] = controller;
+ goto out;
+
+out_free:
+ kfree(new_mtd->name);
+out_ior:
+ iounmap(controller->mmio);
+out_mtd:
+ kfree(controller);
+out:
+ return err;
+}
+
+static int is_geode(void)
+{
+ /* These are the CPUs which will have a CS553[56] companion chip */
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+ boot_cpu_data.x86 == 5 &&
+ boot_cpu_data.x86_model == 10)
+ return 1; /* Geode LX */
+
+ if ((boot_cpu_data.x86_vendor == X86_VENDOR_NSC ||
+ boot_cpu_data.x86_vendor == X86_VENDOR_CYRIX) &&
+ boot_cpu_data.x86 == 5 &&
+ boot_cpu_data.x86_model == 5)
+ return 1; /* Geode GX (née GX2) */
+
+ return 0;
+}
+
+static int __init cs553x_init(void)
+{
+ int err = -ENXIO;
+ int i;
+ uint64_t val;
+
+ /* If the CPU isn't a Geode GX or LX, abort */
+ if (!is_geode())
+ return -ENXIO;
+
+ /* If it doesn't have the CS553[56], abort */
+ rdmsrl(MSR_DIVIL_GLD_CAP, val);
+ val &= ~0xFFULL;
+ if (val != CAP_CS5535 && val != CAP_CS5536)
+ return -ENXIO;
+
+ /* If it doesn't have the NAND controller enabled, abort */
+ rdmsrl(MSR_DIVIL_BALL_OPTS, val);
+ if (val & PIN_OPT_IDE) {
+ pr_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 (controllers[i]) {
+ /* If any devices registered, return success. Else the last error. */
+ mtd_device_register(nand_to_mtd(&controllers[i]->chip),
+ NULL, 0);
+ 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 cs553x_nand_controller *controller = controllers[i];
+ struct nand_chip *this = &controller->chip;
+ struct mtd_info *mtd = nand_to_mtd(this);
+ int ret;
+
+ if (!mtd)
+ continue;
+
+ /* Release resources, unregister device */
+ ret = mtd_device_unregister(mtd);
+ WARN_ON(ret);
+ nand_cleanup(this);
+ kfree(mtd->name);
+ controllers[i] = NULL;
+
+ /* unmap physical address */
+ iounmap(controller->mmio);
+
+ /* Free the MTD device structure */
+ kfree(controller);
+ }
+}
+
+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");