xburst: add support for 3.3

SVN-Revision: 31902

1 files changed, 417 insertions, 0 deletions

diff --git a/target/linux/xburst/patches-3.3/0006-MTD-NAND-JZ4740-Multi-bank-support-with-autodetectio.patch b/target/linux/xburst/patches-3.3/0006-MTD-NAND-JZ4740-Multi-bank-support-with-autodetectio.patch
new file mode 100644
index 0000000000..4110147974
--- /dev/null
+++ b/target/linux/xburst/patches-3.3/0006-MTD-NAND-JZ4740-Multi-bank-support-with-autodetectio.patch
@@ -0,0 +1,417 @@
+From d5814bdb661d3dac61422f8f69e459be884c9a9d Mon Sep 17 00:00:00 2001
+From: Maarten ter Huurne <maarten@treewalker.org>
+Date: Tue, 2 Aug 2011 10:49:28 +0200
+Subject: [PATCH 06/21] MTD: NAND: JZ4740: Multi-bank support with
+ autodetection
+
+The platform data can now specify which external memory banks to probe
+for NAND chips, and in which order. Banks that contain a NAND are used
+and the other banks are freed.
+
+Squashed version of development done in jz-2.6.38 branch.
+Original patch by Lars-Peter Clausen with some bug fixes from me.
+Thanks to Paul Cercueil for the initial autodetection patch.
+---
+ arch/mips/include/asm/mach-jz4740/jz4740_nand.h |    4 +
+ arch/mips/jz4740/platform.c                     |   20 ++-
+ drivers/mtd/nand/jz4740_nand.c                  |  228 +++++++++++++++++++----
+ 3 files changed, 215 insertions(+), 37 deletions(-)
+
+--- a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
++++ b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
+@@ -19,6 +19,8 @@
+ #include <linux/mtd/nand.h>
+ #include <linux/mtd/partitions.h>
+ 
++#define JZ_NAND_NUM_BANKS 4
++
+ struct jz_nand_platform_data {
+ 	int			num_partitions;
+ 	struct mtd_partition	*partitions;
+@@ -27,6 +29,8 @@ struct jz_nand_platform_data {
+ 
+ 	unsigned int busy_gpio;
+ 
++	unsigned char banks[JZ_NAND_NUM_BANKS];
++
+ 	void (*ident_callback)(struct platform_device *, struct nand_chip *,
+ 				struct mtd_partition **, int *num_partitions);
+ };
+--- a/arch/mips/jz4740/platform.c
++++ b/arch/mips/jz4740/platform.c
+@@ -157,11 +157,29 @@ static struct resource jz4740_nand_resou
+ 		.flags	= IORESOURCE_MEM,
+ 	},
+ 	{
+-		.name	= "bank",
++		.name	= "bank1",
+ 		.start	= 0x18000000,
+ 		.end	= 0x180C0000 - 1,
+ 		.flags = IORESOURCE_MEM,
+ 	},
++	{
++		.name	= "bank2",
++		.start	= 0x14000000,
++		.end	= 0x140C0000 - 1,
++		.flags = IORESOURCE_MEM,
++	},
++	{
++		.name	= "bank3",
++		.start	= 0x0C000000,
++		.end	= 0x0C0C0000 - 1,
++		.flags = IORESOURCE_MEM,
++	},
++	{
++		.name	= "bank4",
++		.start	= 0x08000000,
++		.end	= 0x080C0000 - 1,
++		.flags = IORESOURCE_MEM,
++	},
+ };
+ 
+ struct platform_device jz4740_nand_device = {
+--- a/drivers/mtd/nand/jz4740_nand.c
++++ b/drivers/mtd/nand/jz4740_nand.c
+@@ -52,9 +52,10 @@
+ 
+ #define JZ_NAND_CTRL_ENABLE_CHIP(x) BIT((x) << 1)
+ #define JZ_NAND_CTRL_ASSERT_CHIP(x) BIT(((x) << 1) + 1)
++#define JZ_NAND_CTRL_ASSERT_CHIP_MASK 0xaa
+ 
+-#define JZ_NAND_MEM_ADDR_OFFSET 0x10000
+ #define JZ_NAND_MEM_CMD_OFFSET 0x08000
++#define JZ_NAND_MEM_ADDR_OFFSET 0x10000
+ 
+ struct jz_nand {
+ 	struct mtd_info mtd;
+@@ -62,8 +63,11 @@ struct jz_nand {
+ 	void __iomem *base;
+ 	struct resource *mem;
+ 
+-	void __iomem *bank_base;
+-	struct resource *bank_mem;
++	unsigned char banks[JZ_NAND_NUM_BANKS];
++	void __iomem *bank_base[JZ_NAND_NUM_BANKS];
++	struct resource *bank_mem[JZ_NAND_NUM_BANKS];
++
++	int selected_bank;
+ 
+ 	struct jz_nand_platform_data *pdata;
+ 	bool is_reading;
+@@ -74,26 +78,50 @@ static inline struct jz_nand *mtd_to_jz_
+ 	return container_of(mtd, struct jz_nand, mtd);
+ }
+ 
++static void jz_nand_select_chip(struct mtd_info *mtd, int chipnr)
++{
++	struct jz_nand *nand = mtd_to_jz_nand(mtd);
++	struct nand_chip *chip = mtd->priv;
++	uint32_t ctrl;
++	int banknr;
++
++	ctrl = readl(nand->base + JZ_REG_NAND_CTRL);
++	ctrl &= ~JZ_NAND_CTRL_ASSERT_CHIP_MASK;
++
++	if (chipnr == -1) {
++		banknr = -1;
++	} else {
++		banknr = nand->banks[chipnr] - 1;
++		chip->IO_ADDR_R = nand->bank_base[banknr];
++		chip->IO_ADDR_W = nand->bank_base[banknr];
++	}
++	writel(ctrl, nand->base + JZ_REG_NAND_CTRL);
++
++	nand->selected_bank = banknr;
++}
++
+ static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
+ {
+ 	struct jz_nand *nand = mtd_to_jz_nand(mtd);
+ 	struct nand_chip *chip = mtd->priv;
+ 	uint32_t reg;
++	void __iomem *bank_base = nand->bank_base[nand->selected_bank];
++
++	BUG_ON(nand->selected_bank < 0);
+ 
+ 	if (ctrl & NAND_CTRL_CHANGE) {
+ 		BUG_ON((ctrl & NAND_ALE) && (ctrl & NAND_CLE));
+ 		if (ctrl & NAND_ALE)
+-			chip->IO_ADDR_W = nand->bank_base + JZ_NAND_MEM_ADDR_OFFSET;
++			bank_base += JZ_NAND_MEM_ADDR_OFFSET;
+ 		else if (ctrl & NAND_CLE)
+-			chip->IO_ADDR_W = nand->bank_base + JZ_NAND_MEM_CMD_OFFSET;
+-		else
+-			chip->IO_ADDR_W = nand->bank_base;
++			bank_base += JZ_NAND_MEM_CMD_OFFSET;
++		chip->IO_ADDR_W = bank_base;
+ 
+ 		reg = readl(nand->base + JZ_REG_NAND_CTRL);
+ 		if (ctrl & NAND_NCE)
+-			reg |= JZ_NAND_CTRL_ASSERT_CHIP(0);
++			reg |= JZ_NAND_CTRL_ASSERT_CHIP(nand->selected_bank);
+ 		else
+-			reg &= ~JZ_NAND_CTRL_ASSERT_CHIP(0);
++			reg &= ~JZ_NAND_CTRL_ASSERT_CHIP(nand->selected_bank);
+ 		writel(reg, nand->base + JZ_REG_NAND_CTRL);
+ 	}
+ 	if (dat != NAND_CMD_NONE)
+@@ -252,7 +280,7 @@ static int jz_nand_correct_ecc_rs(struct
+ }
+ 
+ static int jz_nand_ioremap_resource(struct platform_device *pdev,
+-	const char *name, struct resource **res, void __iomem **base)
++	const char *name, struct resource **res, void *__iomem *base)
+ {
+ 	int ret;
+ 
+@@ -288,6 +316,90 @@ err:
+ 	return ret;
+ }
+ 
++static inline void jz_nand_iounmap_resource(struct resource *res, void __iomem *base)
++{
++	iounmap(base);
++	release_mem_region(res->start, resource_size(res));
++}
++
++static int __devinit jz_nand_detect_bank(struct platform_device *pdev, struct jz_nand *nand, unsigned char bank, size_t chipnr, uint8_t *nand_maf_id, uint8_t *nand_dev_id) {
++	int ret;
++	int gpio;
++	char gpio_name[9];
++	char res_name[6];
++	uint32_t ctrl;
++	struct mtd_info *mtd = &nand->mtd;
++	struct nand_chip *chip = &nand->chip;
++
++	/* Request GPIO port. */
++	gpio = JZ_GPIO_MEM_CS0 + bank - 1;
++	sprintf(gpio_name, "NAND CS%d", bank);
++	ret = gpio_request(gpio, gpio_name);
++	if (ret) {
++		dev_warn(&pdev->dev,
++			"Failed to request %s gpio %d: %d\n",
++			gpio_name, gpio, ret);
++		goto notfound_gpio;
++	}
++
++	/* Request I/O resource. */
++	sprintf(res_name, "bank%d", bank);
++	ret = jz_nand_ioremap_resource(pdev, res_name,
++					&nand->bank_mem[bank - 1],
++					&nand->bank_base[bank - 1]);
++	if (ret)
++		goto notfound_resource;
++
++	/* Enable chip in bank. */
++	jz_gpio_set_function(gpio, JZ_GPIO_FUNC_MEM_CS0);
++	ctrl = readl(nand->base + JZ_REG_NAND_CTRL);
++	ctrl |= JZ_NAND_CTRL_ENABLE_CHIP(bank - 1);
++	writel(ctrl, nand->base + JZ_REG_NAND_CTRL);
++
++	if (chipnr == 0) {
++		/* Detect first chip. */
++		ret = nand_scan_ident(mtd, 1, NULL);
++		if (ret)
++			goto notfound_id;
++
++		/* Retrieve the IDs from the first chip. */
++		chip->select_chip(mtd, 0);
++		chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
++		chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
++		*nand_maf_id = chip->read_byte(mtd);
++		*nand_dev_id = chip->read_byte(mtd);
++	} else {
++		/* Detect additional chip. */
++		chip->select_chip(mtd, chipnr);
++		chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
++		chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
++		if (*nand_maf_id != chip->read_byte(mtd)
++		 || *nand_dev_id != chip->read_byte(mtd)) {
++			ret = -ENODEV;
++			goto notfound_id;
++		}
++
++		/* Update size of the MTD. */
++		chip->numchips++;
++		mtd->size += chip->chipsize;
++	}
++
++	dev_info(&pdev->dev, "Found chip %i on bank %i\n", chipnr, bank);
++	return 0;
++
++notfound_id:
++	dev_info(&pdev->dev, "No chip found on bank %i\n", bank);
++	ctrl &= ~(JZ_NAND_CTRL_ENABLE_CHIP(bank - 1));
++	writel(ctrl, nand->base + JZ_REG_NAND_CTRL);
++	jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE);
++	jz_nand_iounmap_resource(nand->bank_mem[bank - 1],
++				 nand->bank_base[bank - 1]);
++notfound_resource:
++	gpio_free(gpio);
++notfound_gpio:
++	return ret;
++}
++
+ static int __devinit jz_nand_probe(struct platform_device *pdev)
+ {
+ 	int ret;
+@@ -295,6 +407,8 @@ static int __devinit jz_nand_probe(struc
+ 	struct nand_chip *chip;
+ 	struct mtd_info *mtd;
+ 	struct jz_nand_platform_data *pdata = pdev->dev.platform_data;
++	size_t chipnr, bank_idx;
++	uint8_t nand_maf_id = 0, nand_dev_id = 0;
+ 
+ 	nand = kzalloc(sizeof(*nand), GFP_KERNEL);
+ 	if (!nand) {
+@@ -305,10 +419,6 @@ static int __devinit jz_nand_probe(struc
+ 	ret = jz_nand_ioremap_resource(pdev, "mmio", &nand->mem, &nand->base);
+ 	if (ret)
+ 		goto err_free;
+-	ret = jz_nand_ioremap_resource(pdev, "bank", &nand->bank_mem,
+-			&nand->bank_base);
+-	if (ret)
+-		goto err_iounmap_mmio;
+ 
+ 	if (pdata && gpio_is_valid(pdata->busy_gpio)) {
+ 		ret = gpio_request(pdata->busy_gpio, "NAND busy pin");
+@@ -316,7 +426,7 @@ static int __devinit jz_nand_probe(struc
+ 			dev_err(&pdev->dev,
+ 				"Failed to request busy gpio %d: %d\n",
+ 				pdata->busy_gpio, ret);
+-			goto err_iounmap_mem;
++			goto err_iounmap_mmio;
+ 		}
+ 	}
+ 
+@@ -338,22 +448,51 @@ static int __devinit jz_nand_probe(struc
+ 
+ 	chip->chip_delay = 50;
+ 	chip->cmd_ctrl = jz_nand_cmd_ctrl;
++	chip->select_chip = jz_nand_select_chip;
+ 
+ 	if (pdata && gpio_is_valid(pdata->busy_gpio))
+ 		chip->dev_ready = jz_nand_dev_ready;
+ 
+-	chip->IO_ADDR_R = nand->bank_base;
+-	chip->IO_ADDR_W = nand->bank_base;
+-
+ 	nand->pdata = pdata;
+ 	platform_set_drvdata(pdev, nand);
+ 
+-	writel(JZ_NAND_CTRL_ENABLE_CHIP(0), nand->base + JZ_REG_NAND_CTRL);
+-
+-	ret = nand_scan_ident(mtd, 1, NULL);
+-	if (ret) {
+-		dev_err(&pdev->dev,  "Failed to scan nand\n");
+-		goto err_gpio_free;
++	/* We are going to autodetect NAND chips in the banks specified in the
++	 * platform data. Although nand_scan_ident() can detect multiple chips,
++	 * it requires those chips to be numbered consecuitively, which is not
++	 * always the case for external memory banks. And a fixed chip-to-bank
++	 * mapping is not practical either, since for example Dingoo units
++	 * produced at different times have NAND chips in different banks.
++	 */
++	chipnr = 0;
++	for (bank_idx = 0; bank_idx < JZ_NAND_NUM_BANKS; bank_idx++) {
++		unsigned char bank;
++
++		/* If there is no platform data, look for NAND in bank 1,
++		 * which is the most likely bank since it is the only one
++		 * that can be booted from.
++		 */
++		bank = pdata ? pdata->banks[bank_idx] : bank_idx ^ 1;
++		if (bank == 0)
++			break;
++		if (bank > JZ_NAND_NUM_BANKS) {
++			dev_warn(&pdev->dev,
++				"Skipping non-existing bank: %d\n", bank);
++			continue;
++		}
++		/* The detection routine will directly or indirectly call
++		 * jz_nand_select_chip(), so nand->banks has to contain the
++		 * bank we're checking.
++		 */
++		nand->banks[chipnr] = bank;
++		if (jz_nand_detect_bank(pdev, nand, bank, chipnr,
++					&nand_maf_id, &nand_dev_id) == 0)
++			chipnr++;
++		else
++			nand->banks[chipnr] = 0;
++	}
++	if (chipnr == 0) {
++		dev_err(&pdev->dev, "No NAND chips found\n");
++		goto err_gpio_busy;
+ 	}
+ 
+ 	if (pdata && pdata->ident_callback) {
+@@ -363,8 +502,8 @@ static int __devinit jz_nand_probe(struc
+ 
+ 	ret = nand_scan_tail(mtd);
+ 	if (ret) {
+-		dev_err(&pdev->dev,  "Failed to scan nand\n");
+-		goto err_gpio_free;
++		dev_err(&pdev->dev,  "Failed to scan NAND\n");
++		goto err_unclaim_banks;
+ 	}
+ 
+ 	ret = mtd_device_parse_register(mtd, NULL, 0,
+@@ -381,14 +520,21 @@ static int __devinit jz_nand_probe(struc
+ 	return 0;
+ 
+ err_nand_release:
+-	nand_release(&nand->mtd);
+-err_gpio_free:
++	nand_release(mtd);
++err_unclaim_banks:
++	while (chipnr--) {
++		unsigned char bank = nand->banks[chipnr];
++		gpio_free(JZ_GPIO_MEM_CS0 + bank - 1);
++		jz_nand_iounmap_resource(nand->bank_mem[bank - 1],
++					 nand->bank_base[bank - 1]);
++	}
++	writel(0, nand->base + JZ_REG_NAND_CTRL);
++err_gpio_busy:
++	if (pdata && gpio_is_valid(pdata->busy_gpio))
++		gpio_free(pdata->busy_gpio);
+ 	platform_set_drvdata(pdev, NULL);
+-	gpio_free(pdata->busy_gpio);
+-err_iounmap_mem:
+-	iounmap(nand->bank_base);
+ err_iounmap_mmio:
+-	iounmap(nand->base);
++	jz_nand_iounmap_resource(nand->mem, nand->base);
+ err_free:
+ 	kfree(nand);
+ 	return ret;
+@@ -397,16 +543,26 @@ err_free:
+ static int __devexit jz_nand_remove(struct platform_device *pdev)
+ {
+ 	struct jz_nand *nand = platform_get_drvdata(pdev);
++	struct jz_nand_platform_data *pdata = pdev->dev.platform_data;
++	size_t i;
+ 
+ 	nand_release(&nand->mtd);
+ 
+ 	/* Deassert and disable all chips */
+ 	writel(0, nand->base + JZ_REG_NAND_CTRL);
+ 
+-	iounmap(nand->bank_base);
+-	release_mem_region(nand->bank_mem->start, resource_size(nand->bank_mem));
+-	iounmap(nand->base);
+-	release_mem_region(nand->mem->start, resource_size(nand->mem));
++	for (i = 0; i < JZ_NAND_NUM_BANKS; ++i) {
++		unsigned char bank = nand->banks[i];
++		if (bank != 0) {
++			jz_nand_iounmap_resource(nand->bank_mem[bank - 1],
++						 nand->bank_base[bank - 1]);
++			gpio_free(JZ_GPIO_MEM_CS0 + bank - 1);
++		}
++	}
++	if (pdata && gpio_is_valid(pdata->busy_gpio))
++		gpio_free(pdata->busy_gpio);
++
++	jz_nand_iounmap_resource(nand->mem, nand->base);
+ 
+ 	platform_set_drvdata(pdev, NULL);
+ 	kfree(nand);