linux-kernel - [PATCH 08/47] mtd: nand: stm_nand_bch: initialise the BCH Controller

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Message-Id: <1398938214-17847-9-git-send-email-lee.jones@linaro.org>
Date:	Thu,  1 May 2014 10:56:15 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
	kernel@...inux.com, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 08/47] mtd: nand: stm_nand_bch: initialise the BCH Controller

This call resets the ECC stats, boot-mode controller and the AFM
(Advanced Flex Mode) controller, then enables Advanced Flex Mode,
configures the DMA plugs and finally enables the NANDi controller
IRQs. All required initialisation for clean running of the driver.

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mtd/nand/stm_nand_bch.c | 56 +++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/stm_nand.h    | 20 +++++++++++++++
 2 files changed, 76 insertions(+)

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index d73568c..62a41de 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -14,6 +14,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
@@ -269,6 +270,56 @@ static void nandi_disable_interrupts(struct nandi_controller *nandi,
 	writel(val, nandi->base + NANDBCH_INT_EN);
 }
 
+static void nandi_init_bch(struct nandi_controller *nandi, int emi_bank)
+{
+	dev_dbg(nandi->dev, "%s\n", __func__);
+
+	/* Initialise BCH Controller */
+	emiss_nandi_select(STM_NANDI_BCH);
+
+	/* Reset and disable boot-mode controller */
+	writel(BOOT_CFG_RESET, nandi->base + NANDBCH_BOOTBANK_CFG);
+	udelay(1);
+	writel(0x00000000, nandi->base + NANDBCH_BOOTBANK_CFG);
+
+	/* Reset AFM controller */
+	writel(CFG_RESET, nandi->base + NANDBCH_CONTROLLER_CFG);
+	udelay(1);
+	writel(0x00000000, nandi->base + NANDBCH_CONTROLLER_CFG);
+
+	/* Set EMI Bank */
+	writel(0x1 << emi_bank, nandi->base + NANDBCH_FLEX_MUXCTRL);
+
+	/* Reset ECC stats */
+	writel(CFG_RESET_ECC_ALL, nandi->base + NANDBCH_CONTROLLER_CFG);
+	udelay(1);
+
+	/* Enable AFM */
+	writel(CFG_ENABLE_AFM, nandi->base + NANDBCH_CONTROLLER_CFG);
+
+	/* Configure Read DMA Plugs (values supplied by Validation) */
+	writel(0x00000005, nandi->dma + EMISS_NAND_RD_DMA_PAGE_SIZE);
+	writel(0x00000005, nandi->dma + EMISS_NAND_RD_DMA_MAX_OPCODE_SIZE);
+	writel(0x00000002, nandi->dma + EMISS_NAND_RD_DMA_MIN_OPCODE_SIZE);
+	writel(0x00000001, nandi->dma + EMISS_NAND_RD_DMA_MAX_CHUNK_SIZE);
+	writel(0x00000000, nandi->dma + EMISS_NAND_RD_DMA_MAX_MESSAGE_SIZE);
+
+	/* Configure Write DMA Plugs (values supplied by Validation) */
+	writel(0x00000005, nandi->dma + EMISS_NAND_WR_DMA_PAGE_SIZE);
+	writel(0x00000005, nandi->dma + EMISS_NAND_WR_DMA_MAX_OPCODE_SIZE);
+	writel(0x00000002, nandi->dma + EMISS_NAND_WR_DMA_MIN_OPCODE_SIZE);
+	writel(0x00000001, nandi->dma + EMISS_NAND_WR_DMA_MAX_CHUNK_SIZE);
+	writel(0x00000000, nandi->dma + EMISS_NAND_WR_DMA_MAX_MESSAGE_SIZE);
+
+	nandi_enable_interrupts(nandi, NAND_INT_ENABLE);
+}
+
+static void nandi_init_controller(struct nandi_controller *nandi,
+				  int emi_bank)
+{
+	nandi_init_bch(nandi, emi_bank);
+}
+
 static int remap_named_resource(struct platform_device *pdev,
 				char *name,
 				void __iomem **io_ptr)
@@ -341,6 +392,7 @@ nandi_init_resources(struct platform_device *pdev)
 static int stm_nand_bch_probe(struct platform_device *pdev)
 {
 	struct stm_plat_nand_bch_data *pdata = pdev->dev.platform_data;
+	struct stm_nand_bank_data *bank;
 	struct nandi_controller *nandi;
 
 	nandi = nandi_init_resources(pdev);
@@ -352,6 +404,10 @@ static int stm_nand_bch_probe(struct platform_device *pdev)
 	init_completion(&nandi->seq_completed);
 	init_completion(&nandi->rbn_completed);
 
+	bank = pdata->bank;
+	if (bank)
+		nandi_init_controller(nandi, bank->csn);
+
 	return 0;
 }
 
diff --git a/include/linux/mtd/stm_nand.h b/include/linux/mtd/stm_nand.h
index da2006c..99a69ca 100644
--- a/include/linux/mtd/stm_nand.h
+++ b/include/linux/mtd/stm_nand.h
@@ -17,6 +17,26 @@
 
 #include <linux/io.h>
 
+/*
+ * Board-level specification relating to a 'bank' of NAND Flash
+ */
+struct stm_nand_bank_data {
+	int			csn;
+	int			nr_partitions;
+	struct mtd_partition	*partitions;
+	unsigned int		options;
+	unsigned int		bbt_options;
+
+	struct nand_timing_spec *timing_spec;
+
+	/*
+	 * No. of IP clk cycles by which to 'relax' the timing configuration.
+	 * Required on some boards to to accommodate board-level limitations.
+	 * Used in conjunction with 'nand_timing_spec' and ONFI configuration.
+	 */
+	int			timing_relax;
+};
+
 struct stm_plat_nand_bch_data {
 	struct stm_nand_bank_data *bank;
 	enum stm_nand_bch_ecc_config bch_ecc_cfg;
-- 
1.8.3.2

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