cfi_flash: convert to driver model

Convert cfi flash to driver model.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 89 insertions, 0 deletions

diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 23dff48f08..57e4b867bc 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -8,6 +8,17 @@ config MTD
 	  flash, RAM and similar chips, often used for solid state file
 	  systems on embedded devices.
 
+config CFI_FLASH
+	bool "Enable Driver Model for CFI Flash driver"
+	depends on MTD
+	help
+	  The Common Flash Interface specification was developed by Intel,
+	  AMD and other flash manufactures. It provides a universal method
+	  for probing the capabilities of flash devices. If you wish to
+	  support any device that is CFI-compliant, you need to enable this
+	  option. Visit <http://www.amd.com/products/nvd/overview/cfi.html>
+	  for more information on CFI.
+
 endmenu
 
 source "drivers/mtd/nand/Kconfig"
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index fc7a878d59..e3cb59887c 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -18,6 +18,9 @@
 /* #define DEBUG	*/
 
 #include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdt_support.h>
 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/byteorder.h>
@@ -47,6 +50,8 @@
  * reading and writing ... (yes there is such a Hardware).
  */
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static uint flash_offset_cfi[2] = { FLASH_OFFSET_CFI, FLASH_OFFSET_CFI_ALT };
 #ifdef CONFIG_FLASH_CFI_MTD
 static uint flash_verbose = 1;
@@ -87,10 +92,36 @@ static u16 cfi_flash_config_reg(int i)
 int cfi_flash_num_flash_banks = CONFIG_SYS_MAX_FLASH_BANKS_DETECT;
 #endif
 
+#ifdef CONFIG_CFI_FLASH /* for driver model */
+static void cfi_flash_init_dm(void)
+{
+	struct udevice *dev;
+
+	cfi_flash_num_flash_banks = 0;
+	/*
+	 * The uclass_first_device() will probe the first device and
+	 * uclass_next_device() will probe the rest if they exist. So
+	 * that cfi_flash_probe() will get called assigning the base
+	 * addresses that are available.
+	 */
+	for (uclass_first_device(UCLASS_MTD, &dev);
+	     dev;
+	     uclass_next_device(&dev)) {
+	}
+}
+
+static phys_addr_t cfi_flash_base[CFI_MAX_FLASH_BANKS];
+
+phys_addr_t cfi_flash_bank_addr(int i)
+{
+	return cfi_flash_base[i];
+}
+#else
 __weak phys_addr_t cfi_flash_bank_addr(int i)
 {
 	return ((phys_addr_t [])CONFIG_SYS_FLASH_BANKS_LIST)[i];
 }
+#endif
 
 __weak unsigned long cfi_flash_bank_size(int i)
 {
@@ -2322,6 +2353,10 @@ unsigned long flash_init (void)
 	getenv_f("unlock", s, sizeof(s));
 #endif
 
+#ifdef CONFIG_CFI_FLASH /* for driver model */
+	cfi_flash_init_dm();
+#endif
+
 	/* Init: no FLASHes known */
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;
@@ -2398,3 +2433,46 @@ unsigned long flash_init (void)
 
 	return (size);
 }
+
+#ifdef CONFIG_CFI_FLASH /* for driver model */
+static int cfi_flash_probe(struct udevice *dev)
+{
+	void *blob = (void *)gd->fdt_blob;
+	int node = dev->of_offset;
+	const fdt32_t *cell;
+	phys_addr_t addr;
+	int parent, addrc, sizec;
+	int len, idx;
+
+	parent = fdt_parent_offset(blob, node);
+	of_bus_default_count_cells(blob, parent, &addrc, &sizec);
+	/* decode regs, there may be multiple reg tuples. */
+	cell = fdt_getprop(blob, node, "reg", &len);
+	if (!cell)
+		return -ENOENT;
+	idx = 0;
+	len /= sizeof(fdt32_t);
+	while (idx < len) {
+		addr = fdt_translate_address((void *)blob,
+					     node, cell + idx);
+		cfi_flash_base[cfi_flash_num_flash_banks++] = addr;
+		idx += addrc + sizec;
+	}
+	gd->bd->bi_flashstart = cfi_flash_base[0];
+
+	return 0;
+}
+
+static const struct udevice_id cfi_flash_ids[] = {
+	{ .compatible = "cfi-flash" },
+	{ .compatible = "jedec-flash" },
+	{}
+};
+
+U_BOOT_DRIVER(cfi_flash) = {
+	.name	= "cfi_flash",
+	.id	= UCLASS_MTD,
+	.of_match = cfi_flash_ids,
+	.probe = cfi_flash_probe,
+};
+#endif /* CONFIG_CFI_FLASH */