mtd: nand: denali: avoid magic numbers and rename for clarification

Introduce some macros and helpers to avoid magic numbers and
rename macros/functions for clarification.

- We see '| 2' in several places.  This means Data Cycle in MAP11 mode.
  The Denali User's Guide says bit[1:0] of MAP11 is like follows:

  b'00 = Command Cycle
  b'01 = Address Cycle
  b'10 = Data Cycle

  So, this commit added DENALI_MAP11_{CMD,ADDR,DATA} macros.

- We see 'denali->flash_mem + 0x10' in several places, but 0x10 is a
  magic number.  Actually, this accesses the data port of the Host
  Data/Command Interface.  So, this commit added DENALI_HOST_DATA.
  On the other hand, 'denali->flash_mem' gets access to the address
  port, so DENALI_HOST_ADDR was also added.

- We see 'index_addr(denali, cmd, 0x1)' in denali_erase(), but 0x1
  is a magic number.  0x1 means the erase operation.  Replace 0x1
  with DENALI_ERASE.

- Rename index_addr() to denali_host_write() for clarification

- Denali User's Guide says MAP{00,01,10,11} for access mode.  Match
  the macros with terminology in the IP document.

- Rename struct members as follows:
  flash_bank   -> active_bank    (currently selected bank)
  flash_reg    -> reg            (base address of registers)
  flash_mem    -> host           (base address of host interface)
  devnum       -> devs_per_cs    (devices connected in parallel)
  bbtskipbytes -> oob_skip_bytes (number of bytes to skip in OOB)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/denali.h

@@ -303,18 +303,13 @@
 #define     CHNL_ACTIVE__CHANNEL2			BIT(2)
 #define     CHNL_ACTIVE__CHANNEL3			BIT(3)
 
-#define MODE_00    0x00000000
-#define MODE_01    0x04000000
-#define MODE_10    0x08000000
-#define MODE_11    0x0C000000
-
 struct denali_nand_info {
 	struct nand_chip nand;
 	unsigned long clk_x_rate;	/* bus interface clock rate */
-	int flash_bank; /* currently selected chip */
+	int active_bank;		/* currently selected bank */
 	struct device *dev;
-	void __iomem *flash_reg;	/* Register Interface */
-	void __iomem *flash_mem;	/* Host Data/Command Interface */
+	void __iomem *reg;		/* Register Interface */
+	void __iomem *host;		/* Host Data/Command Interface */
 
 	/* elements used by ISR */
 	struct completion complete;
@@ -326,8 +321,8 @@ struct denali_nand_info {
 	void *buf;
 	dma_addr_t dma_addr;
 	int dma_avail;
-	int devnum;	/* represent how many nands connected */
-	int bbtskipbytes;
+	int devs_per_cs;		/* devices connected in parallel */
+	int oob_skip_bytes;
 	int max_banks;
 	unsigned int revision;
 	unsigned int caps;

drivers/mtd/nand/denali_dt.c

@@ -104,14 +104,14 @@ static int denali_dt_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "denali_reg");
-	denali->flash_reg = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(denali->flash_reg))
-		return PTR_ERR(denali->flash_reg);
+	denali->reg = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(denali->reg))
+		return PTR_ERR(denali->reg);
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
-	denali->flash_mem = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(denali->flash_mem))
-		return PTR_ERR(denali->flash_mem);
+	denali->host = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(denali->host))
+		return PTR_ERR(denali->host);
 
 	dt->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dt->clk)) {

drivers/mtd/nand/denali_pci.c

@@ -78,14 +78,14 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		return ret;
 	}
 
-	denali->flash_reg = ioremap_nocache(csr_base, csr_len);
-	if (!denali->flash_reg) {
+	denali->reg = ioremap_nocache(csr_base, csr_len);
+	if (!denali->reg) {
 		dev_err(&dev->dev, "Spectra: Unable to remap memory region\n");
 		return -ENOMEM;
 	}
 
-	denali->flash_mem = ioremap_nocache(mem_base, mem_len);
-	if (!denali->flash_mem) {
+	denali->host = ioremap_nocache(mem_base, mem_len);
+	if (!denali->host) {
 		dev_err(&dev->dev, "Spectra: ioremap_nocache failed!");
 		ret = -ENOMEM;
 		goto failed_remap_reg;
@@ -100,9 +100,9 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	return 0;
 
 failed_remap_mem:
-	iounmap(denali->flash_mem);
+	iounmap(denali->host);
 failed_remap_reg:
-	iounmap(denali->flash_reg);
+	iounmap(denali->reg);
 	return ret;
 }
 
@@ -112,8 +112,8 @@ static void denali_pci_remove(struct pci_dev *dev)
 	struct denali_nand_info *denali = pci_get_drvdata(dev);
 
 	denali_remove(denali);
-	iounmap(denali->flash_reg);
-	iounmap(denali->flash_mem);
+	iounmap(denali->reg);
+	iounmap(denali->host);
 }
 
 static struct pci_driver denali_pci_driver = {