mtd: add altera quadspi driver

Add Altera Generic Quad SPI Controller support. The controller
converts SPI NOR flash to parallel flash interface. So it is
not like other SPI flash, but rather like CFI flash.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

4 files changed, 318 insertions, 0 deletions

diff --git a/doc/device-tree-bindings/mtd/altera_qspi.txt b/doc/device-tree-bindings/mtd/altera_qspi.txt
new file mode 100644
index 0000000..3361ac9
--- /dev/null
+++ b/doc/device-tree-bindings/mtd/altera_qspi.txt
@@ -0,0 +1,35 @@
+Altera QUADSPI driver
+
+Required properties:
+- compatible: Should be "altr,quadspi-1.0"
+- reg: Address and length of the register set  for the device. It contains
+  the information of registers in the same order as described by reg-names
+- reg-names: Should contain the reg names
+  "avl_csr": Should contain the register configuration base address
+  "avl_mem": Should contain the data base address
+- #address-cells: Must be <1>.
+- #size-cells: Must be <0>.
+- flash device tree subnode, there must be a node with the following fields:
+	- compatible: Should contain the flash name:
+	  1. EPCS:   epcs16, epcs64, epcs128
+	  2. EPCQ:   epcq16, epcq32, epcq64, epcq128, epcq256, epcq512, epcq1024
+	  3. EPCQ-L: epcql256, epcql512, epcql1024
+	- #address-cells: please refer to /mtd/partition.txt
+	- #size-cells: please refer to /mtd/partition.txt
+	For partitions inside each flash, please refer to /mtd/partition.txt
+
+Example:
+
+	quadspi_controller_0: quadspi@0x180014a0 {
+		compatible = "altr,quadspi-1.0";
+		reg = <0x180014a0 0x00000020>,
+		      <0x14000000 0x04000000>;
+		reg-names = "avl_csr", "avl_mem";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		flash0: epcq512@0 {
+			compatible = "altr,epcq512";
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+	};
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 57e4b86..c58841e 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -19,6 +19,15 @@ config CFI_FLASH
 	  option. Visit <http://www.amd.com/products/nvd/overview/cfi.html>
 	  for more information on CFI.
 
+config ALTERA_QSPI
+	bool "Altera Generic Quad SPI Controller"
+	depends on MTD
+	help
+	  This enables access to Altera EPCQ/EPCS flash chips using the
+	  Altera Generic Quad SPI Controller. The controller converts SPI
+	  NOR flash to parallel flash interface. Please find details on the
+	  "Embedded Peripherals IP User Guide" of Altera.
+
 endmenu
 
 source "drivers/mtd/nand/Kconfig"
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index c23c0c1..7f018a4 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -11,6 +11,7 @@ endif
 obj-$(CONFIG_MTD) += mtd-uclass.o
 obj-$(CONFIG_MTD_PARTITIONS) += mtdpart.o
 obj-$(CONFIG_MTD_CONCAT) += mtdconcat.o
+obj-$(CONFIG_ALTERA_QSPI) += altera_qspi.o
 obj-$(CONFIG_HAS_DATAFLASH) += at45.o
 obj-$(CONFIG_FLASH_CFI_DRIVER) += cfi_flash.o
 obj-$(CONFIG_FLASH_CFI_MTD) += cfi_mtd.o
diff --git a/drivers/mtd/altera_qspi.c b/drivers/mtd/altera_qspi.c
new file mode 100644
index 0000000..1826dc8
--- /dev/null
+++ b/drivers/mtd/altera_qspi.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdt_support.h>
+#include <flash.h>
+#include <mtd.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * The QUADSPI_MEM_OP register is used to do memory protect and erase operations
+ */
+#define QUADSPI_MEM_OP_BULK_ERASE		0x00000001
+#define QUADSPI_MEM_OP_SECTOR_ERASE		0x00000002
+#define QUADSPI_MEM_OP_SECTOR_PROTECT		0x00000003
+
+/*
+ * The QUADSPI_ISR register is used to determine whether an invalid write or
+ * erase operation trigerred an interrupt
+ */
+#define QUADSPI_ISR_ILLEGAL_ERASE		BIT(0)
+#define QUADSPI_ISR_ILLEGAL_WRITE		BIT(1)
+
+struct altera_qspi_regs {
+	u32	rd_status;
+	u32	rd_sid;
+	u32	rd_rdid;
+	u32	mem_op;
+	u32	isr;
+	u32	imr;
+	u32	chip_select;
+};
+
+struct altera_qspi_platdata {
+	struct altera_qspi_regs *regs;
+	void *base;
+	unsigned long size;
+};
+
+flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];	/* FLASH chips info */
+
+void flash_print_info(flash_info_t *info)
+{
+	printf("Altera QSPI flash  Size: %ld MB in %d Sectors\n",
+	       info->size >> 20, info->sector_count);
+}
+
+int flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+	struct mtd_info *mtd = info->mtd;
+	struct erase_info instr;
+	int ret;
+
+	memset(&instr, 0, sizeof(instr));
+	instr.addr = mtd->erasesize * s_first;
+	instr.len = mtd->erasesize * (s_last + 1 - s_first);
+	ret = mtd_erase(mtd, &instr);
+	if (ret)
+		return ERR_NOT_ERASED;
+
+	return 0;
+}
+
+int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+	struct mtd_info *mtd = info->mtd;
+	struct udevice *dev = mtd->dev;
+	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
+	ulong base = (ulong)pdata->base;
+	loff_t to = addr - base;
+	size_t retlen;
+	int ret;
+
+	ret = mtd_write(mtd, to, cnt, &retlen, src);
+	if (ret)
+		return ERR_NOT_ERASED;
+
+	return 0;
+}
+
+unsigned long flash_init(void)
+{
+	struct udevice *dev;
+
+	/* probe every MTD device */
+	for (uclass_first_device(UCLASS_MTD, &dev);
+	     dev;
+	     uclass_next_device(&dev)) {
+	}
+
+	return flash_info[0].size;
+}
+
+static int altera_qspi_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+	struct udevice *dev = mtd->dev;
+	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
+	struct altera_qspi_regs *regs = pdata->regs;
+	size_t addr = instr->addr;
+	size_t len = instr->len;
+	size_t end = addr + len;
+	u32 sect;
+	u32 stat;
+
+	instr->state = MTD_ERASING;
+	addr &= ~(mtd->erasesize - 1); /* get lower aligned address */
+	while (addr < end) {
+		sect = addr / mtd->erasesize;
+		sect <<= 8;
+		sect |= QUADSPI_MEM_OP_SECTOR_ERASE;
+		debug("erase %08x\n", sect);
+		writel(sect, &regs->mem_op);
+		stat = readl(&regs->isr);
+		if (stat & QUADSPI_ISR_ILLEGAL_ERASE) {
+			/* erase failed, sector might be protected */
+			debug("erase %08x fail %x\n", sect, stat);
+			writel(stat, &regs->isr); /* clear isr */
+			instr->state = MTD_ERASE_FAILED;
+			return -EIO;
+		}
+		addr += mtd->erasesize;
+	}
+	instr->state = MTD_ERASE_DONE;
+	mtd_erase_callback(instr);
+
+	return 0;
+}
+
+static int altera_qspi_read(struct mtd_info *mtd, loff_t from, size_t len,
+			    size_t *retlen, u_char *buf)
+{
+	struct udevice *dev = mtd->dev;
+	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
+
+	memcpy_fromio(buf, pdata->base + from, len);
+	*retlen = len;
+
+	return 0;
+}
+
+static int altera_qspi_write(struct mtd_info *mtd, loff_t to, size_t len,
+			     size_t *retlen, const u_char *buf)
+{
+	struct udevice *dev = mtd->dev;
+	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
+	struct altera_qspi_regs *regs = pdata->regs;
+	u32 stat;
+
+	memcpy_toio(pdata->base + to, buf, len);
+	/* check whether write triggered a illegal write interrupt */
+	stat = readl(&regs->isr);
+	if (stat & QUADSPI_ISR_ILLEGAL_WRITE) {
+		/* write failed, sector might be protected */
+		debug("write fail %x\n", stat);
+		writel(stat, &regs->isr); /* clear isr */
+		return -EIO;
+	}
+	*retlen = len;
+
+	return 0;
+}
+
+static void altera_qspi_sync(struct mtd_info *mtd)
+{
+}
+
+static int altera_qspi_probe(struct udevice *dev)
+{
+	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
+	struct altera_qspi_regs *regs = pdata->regs;
+	unsigned long base = (unsigned long)pdata->base;
+	struct mtd_info *mtd;
+	flash_info_t *flash = &flash_info[0];
+	u32 rdid;
+	int i;
+
+	rdid = readl(&regs->rd_rdid);
+	debug("rdid %x\n", rdid);
+
+	mtd = dev_get_uclass_priv(dev);
+	mtd->dev = dev;
+	mtd->name		= "nor0";
+	mtd->type		= MTD_NORFLASH;
+	mtd->flags		= MTD_CAP_NORFLASH;
+	mtd->size		= 1 << ((rdid & 0xff) - 6);
+	mtd->writesize		= 1;
+	mtd->writebufsize	= mtd->writesize;
+	mtd->_erase		= altera_qspi_erase;
+	mtd->_read		= altera_qspi_read;
+	mtd->_write		= altera_qspi_write;
+	mtd->_sync		= altera_qspi_sync;
+	mtd->numeraseregions = 0;
+	mtd->erasesize = 0x10000;
+	if (add_mtd_device(mtd))
+		return -ENOMEM;
+
+	flash->mtd = mtd;
+	flash->size = mtd->size;
+	flash->sector_count = mtd->size / mtd->erasesize;
+	flash->flash_id = rdid;
+	flash->start[0] = base;
+	for (i = 1; i < flash->sector_count; i++)
+		flash->start[i] = flash->start[i - 1] + mtd->erasesize;
+	gd->bd->bi_flashstart = base;
+
+	return 0;
+}
+
+static int altera_qspi_ofdata_to_platdata(struct udevice *dev)
+{
+	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
+	void *blob = (void *)gd->fdt_blob;
+	int node = dev->of_offset;
+	const char *list, *end;
+	const fdt32_t *cell;
+	void *base;
+	unsigned long addr, size;
+	int parent, addrc, sizec;
+	int len, idx;
+
+	/*
+	 * decode regs. there are multiple reg tuples, and they need to
+	 * match with reg-names.
+	 */
+	parent = fdt_parent_offset(blob, node);
+	of_bus_default_count_cells(blob, parent, &addrc, &sizec);
+	list = fdt_getprop(blob, node, "reg-names", &len);
+	if (!list)
+		return -ENOENT;
+	end = list + len;
+	cell = fdt_getprop(blob, node, "reg", &len);
+	if (!cell)
+		return -ENOENT;
+	idx = 0;
+	while (list < end) {
+		addr = fdt_translate_address((void *)blob,
+					     node, cell + idx);
+		size = fdt_addr_to_cpu(cell[idx + addrc]);
+		base = ioremap(addr, size);
+		len = strlen(list);
+		if (strcmp(list, "avl_csr") == 0) {
+			pdata->regs = base;
+		} else if (strcmp(list, "avl_mem") == 0) {
+			pdata->base = base;
+			pdata->size = size;
+		}
+		idx += addrc + sizec;
+		list += (len + 1);
+	}
+
+	return 0;
+}
+
+static const struct udevice_id altera_qspi_ids[] = {
+	{ .compatible = "altr,quadspi-1.0" },
+	{}
+};
+
+U_BOOT_DRIVER(altera_qspi) = {
+	.name	= "altera_qspi",
+	.id	= UCLASS_MTD,
+	.of_match = altera_qspi_ids,
+	.ofdata_to_platdata = altera_qspi_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct altera_qspi_platdata),
+	.probe	= altera_qspi_probe,
+};