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17cb4b8f32
These functions are part of the Linux 4.6 sync. They are being added before the main sync patch in order to make it easier to address the issue across all NAND drivers (many/most of which do not closely track their Linux counterparts) separately from other merge issues. Signed-off-by: Scott Wood <oss@buserror.net>
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
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* (C) Copyright 2006
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* KwikByte <kb9200_dev@kwikbyte.com>
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*
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* (C) Copyright 2009
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* Matthias Kaehlcke <matthias@kaehlcke.net>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/AT91RM9200.h>
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#include <asm/arch/hardware.h>
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#include <nand.h>
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/*
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* hardware specific access to control-lines
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*/
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#define MASK_ALE (1 << 22) /* our ALE is A22 */
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#define MASK_CLE (1 << 21) /* our CLE is A21 */
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#define KB9202_NAND_NCE (1 << 28) /* EN* on D28 */
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#define KB9202_NAND_BUSY (1 << 29) /* RB* on D29 */
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#define KB9202_SMC2_NWS (1 << 2)
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#define KB9202_SMC2_TDF (1 << 8)
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#define KB9202_SMC2_RWSETUP (1 << 24)
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#define KB9202_SMC2_RWHOLD (1 << 29)
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/*
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* Board-specific function to access device control signals
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*/
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static void kb9202_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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struct nand_chip *this = mtd_to_nand(mtd);
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if (ctrl & NAND_CTRL_CHANGE) {
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ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
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/* clear ALE and CLE bits */
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IO_ADDR_W &= ~(MASK_ALE | MASK_CLE);
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if (ctrl & NAND_CLE)
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IO_ADDR_W |= MASK_CLE;
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if (ctrl & NAND_ALE)
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IO_ADDR_W |= MASK_ALE;
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this->IO_ADDR_W = (void *) IO_ADDR_W;
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if (ctrl & NAND_NCE)
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writel(KB9202_NAND_NCE, AT91C_PIOC_CODR);
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else
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writel(KB9202_NAND_NCE, AT91C_PIOC_SODR);
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}
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if (cmd != NAND_CMD_NONE)
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writeb(cmd, this->IO_ADDR_W);
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}
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/*
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* Board-specific function to access the device ready signal.
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*/
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static int kb9202_nand_ready(struct mtd_info *mtd)
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{
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return readl(AT91C_PIOC_PDSR) & KB9202_NAND_BUSY;
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}
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/*
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* Board-specific NAND init. Copied from include/linux/mtd/nand.h for reference.
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*
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* struct nand_chip - NAND Private Flash Chip Data
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* @IO_ADDR_R: [BOARDSPECIFIC] address to read the 8 I/O lines of the flash device
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* @IO_ADDR_W: [BOARDSPECIFIC] address to write the 8 I/O lines of the flash device
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* @hwcontrol: [BOARDSPECIFIC] hardwarespecific function for accesing control-lines
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* @dev_ready: [BOARDSPECIFIC] hardwarespecific function for accesing device ready/busy line
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* If set to NULL no access to ready/busy is available and the ready/busy information
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* is read from the chip status register
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* @enable_hwecc: [BOARDSPECIFIC] function to enable (reset) hardware ecc generator. Must only
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* be provided if a hardware ECC is available
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* @eccmode: [BOARDSPECIFIC] mode of ecc, see defines
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* @chip_delay: [BOARDSPECIFIC] chip dependent delay for transfering data from array to read regs (tR)
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* @options: [BOARDSPECIFIC] various chip options. They can partly be set to inform nand_scan about
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* special functionality. See the defines for further explanation
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*/
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/*
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* This routine initializes controller and GPIOs.
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*/
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int board_nand_init(struct nand_chip *nand)
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{
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unsigned int value;
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nand->ecc.mode = NAND_ECC_SOFT;
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nand->cmd_ctrl = kb9202_nand_hwcontrol;
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nand->dev_ready = kb9202_nand_ready;
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/* in case running outside of bootloader */
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writel(1 << AT91C_ID_PIOC, AT91C_PMC_PCER);
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/* setup nand flash access (allow ample margin) */
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/* 4 wait states, 1 setup, 1 hold, 1 float for 8-bit device */
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writel(AT91C_SMC2_WSEN | KB9202_SMC2_NWS | KB9202_SMC2_TDF |
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AT91C_SMC2_DBW_8 | KB9202_SMC2_RWSETUP | KB9202_SMC2_RWHOLD,
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AT91C_SMC_CSR3);
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/* enable internal NAND controller */
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value = readl(AT91C_EBI_CSA);
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value |= AT91C_EBI_CS3A_SMC_SmartMedia;
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writel(value, AT91C_EBI_CSA);
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/* enable SMOE/SMWE */
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writel(AT91C_PC1_BFRDY_SMOE | AT91C_PC3_BFBAA_SMWE, AT91C_PIOC_ASR);
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writel(AT91C_PC1_BFRDY_SMOE | AT91C_PC3_BFBAA_SMWE, AT91C_PIOC_PDR);
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writel(AT91C_PC1_BFRDY_SMOE | AT91C_PC3_BFBAA_SMWE, AT91C_PIOC_OER);
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/* set NCE to high */
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writel(KB9202_NAND_NCE, AT91C_PIOC_SODR);
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/* disable output on pin connected to the busy line of the NAND */
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writel(KB9202_NAND_BUSY, AT91C_PIOC_ODR);
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/* enable the PIO to control NCE and BUSY */
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writel(KB9202_NAND_NCE | KB9202_NAND_BUSY, AT91C_PIOC_PER);
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/* enable output for NCE */
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writel(KB9202_NAND_NCE, AT91C_PIOC_OER);
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return (0);
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}
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