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linux_dsm_epyc7002/drivers/mtd/nand/xway_nand.c
Boris Brezillon d4092d76a4 mtd: nand: Rename nand.h into rawnand.h 
We are planning to share more code between different NAND based
devices (SPI NAND, OneNAND and raw NANDs), but before doing that
we need to move the existing include/linux/mtd/nand.h file into
include/linux/mtd/rawnand.h so we can later create a nand.h header
containing all common structure and function prototypes.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Peter Pan <peterpandong@micron.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Acked-by: Wenyou Yang <wenyou.yang@microchip.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Han Xu <han.xu@nxp.com>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-By: Harvey Hunt <harveyhuntnexus@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Krzysztof Halasa <khalasa@piap.pl>
2017-08-13 10:11:49 +02:00

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/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Copyright © 2012 John Crispin <john@phrozen.org>
* Copyright © 2016 Hauke Mehrtens <hauke@hauke-m.de>
*/
#include <linux/mtd/rawnand.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
#include <lantiq_soc.h>
/* nand registers */
#define EBU_ADDSEL1 0x24
#define EBU_NAND_CON 0xB0
#define EBU_NAND_WAIT 0xB4
#define NAND_WAIT_RD BIT(0) /* NAND flash status output */
#define NAND_WAIT_WR_C BIT(3) /* NAND Write/Read complete */
#define EBU_NAND_ECC0 0xB8
#define EBU_NAND_ECC_AC 0xBC
/*
* nand commands
* The pins of the NAND chip are selected based on the address bits of the
* "register" read and write. There are no special registers, but an
* address range and the lower address bits are used to activate the
* correct line. For example when the bit (1 << 2) is set in the address
* the ALE pin will be activated.
*/
#define NAND_CMD_ALE BIT(2) /* address latch enable */
#define NAND_CMD_CLE BIT(3) /* command latch enable */
#define NAND_CMD_CS BIT(4) /* chip select */
#define NAND_CMD_SE BIT(5) /* spare area access latch */
#define NAND_CMD_WP BIT(6) /* write protect */
#define NAND_WRITE_CMD (NAND_CMD_CS | NAND_CMD_CLE)
#define NAND_WRITE_ADDR (NAND_CMD_CS | NAND_CMD_ALE)
#define NAND_WRITE_DATA (NAND_CMD_CS)
#define NAND_READ_DATA (NAND_CMD_CS)
/* we need to tel the ebu which addr we mapped the nand to */
#define ADDSEL1_MASK(x) (x << 4)
#define ADDSEL1_REGEN 1
/* we need to tell the EBU that we have nand attached and set it up properly */
#define BUSCON1_SETUP (1 << 22)
#define BUSCON1_BCGEN_RES (0x3 << 12)
#define BUSCON1_WAITWRC2 (2 << 8)
#define BUSCON1_WAITRDC2 (2 << 6)
#define BUSCON1_HOLDC1 (1 << 4)
#define BUSCON1_RECOVC1 (1 << 2)
#define BUSCON1_CMULT4 1
#define NAND_CON_CE (1 << 20)
#define NAND_CON_OUT_CS1 (1 << 10)
#define NAND_CON_IN_CS1 (1 << 8)
#define NAND_CON_PRE_P (1 << 7)
#define NAND_CON_WP_P (1 << 6)
#define NAND_CON_SE_P (1 << 5)
#define NAND_CON_CS_P (1 << 4)
#define NAND_CON_CSMUX (1 << 1)
#define NAND_CON_NANDM 1
struct xway_nand_data {
struct nand_chip chip;
unsigned long csflags;
void __iomem *nandaddr;
};
static u8 xway_readb(struct mtd_info *mtd, int op)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct xway_nand_data *data = nand_get_controller_data(chip);
return readb(data->nandaddr + op);
}
static void xway_writeb(struct mtd_info *mtd, int op, u8 value)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct xway_nand_data *data = nand_get_controller_data(chip);
writeb(value, data->nandaddr + op);
}
static void xway_select_chip(struct mtd_info *mtd, int select)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct xway_nand_data *data = nand_get_controller_data(chip);
switch (select) {
case -1:
ltq_ebu_w32_mask(NAND_CON_CE, 0, EBU_NAND_CON);
ltq_ebu_w32_mask(NAND_CON_NANDM, 0, EBU_NAND_CON);
spin_unlock_irqrestore(&ebu_lock, data->csflags);
break;
case 0:
spin_lock_irqsave(&ebu_lock, data->csflags);
ltq_ebu_w32_mask(0, NAND_CON_NANDM, EBU_NAND_CON);
ltq_ebu_w32_mask(0, NAND_CON_CE, EBU_NAND_CON);
break;
default:
BUG();
}
}
static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
xway_writeb(mtd, NAND_WRITE_CMD, cmd);
else if (ctrl & NAND_ALE)
xway_writeb(mtd, NAND_WRITE_ADDR, cmd);
while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
;
}
static int xway_dev_ready(struct mtd_info *mtd)
{
return ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_RD;
}
static unsigned char xway_read_byte(struct mtd_info *mtd)
{
return xway_readb(mtd, NAND_READ_DATA);
}
static void xway_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
buf[i] = xway_readb(mtd, NAND_WRITE_DATA);
}
static void xway_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
xway_writeb(mtd, NAND_WRITE_DATA, buf[i]);
}
/*
* Probe for the NAND device.
*/
static int xway_nand_probe(struct platform_device *pdev)
{
struct xway_nand_data *data;
struct mtd_info *mtd;
struct resource *res;
int err;
u32 cs;
u32 cs_flag = 0;
/* Allocate memory for the device structure (and zero it) */
data = devm_kzalloc(&pdev->dev, sizeof(struct xway_nand_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->nandaddr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->nandaddr))
return PTR_ERR(data->nandaddr);
nand_set_flash_node(&data->chip, pdev->dev.of_node);
mtd = nand_to_mtd(&data->chip);
mtd->dev.parent = &pdev->dev;
data->chip.cmd_ctrl = xway_cmd_ctrl;
data->chip.dev_ready = xway_dev_ready;
data->chip.select_chip = xway_select_chip;
data->chip.write_buf = xway_write_buf;
data->chip.read_buf = xway_read_buf;
data->chip.read_byte = xway_read_byte;
data->chip.chip_delay = 30;
data->chip.ecc.mode = NAND_ECC_SOFT;
data->chip.ecc.algo = NAND_ECC_HAMMING;
platform_set_drvdata(pdev, data);
nand_set_controller_data(&data->chip, data);
/* load our CS from the DT. Either we find a valid 1 or default to 0 */
err = of_property_read_u32(pdev->dev.of_node, "lantiq,cs", &cs);
if (!err && cs == 1)
cs_flag = NAND_CON_IN_CS1 | NAND_CON_OUT_CS1;
/* setup the EBU to run in NAND mode on our base addr */
ltq_ebu_w32(CPHYSADDR(data->nandaddr)
| ADDSEL1_MASK(3) | ADDSEL1_REGEN, EBU_ADDSEL1);
ltq_ebu_w32(BUSCON1_SETUP | BUSCON1_BCGEN_RES | BUSCON1_WAITWRC2
| BUSCON1_WAITRDC2 | BUSCON1_HOLDC1 | BUSCON1_RECOVC1
| BUSCON1_CMULT4, LTQ_EBU_BUSCON1);
ltq_ebu_w32(NAND_CON_NANDM | NAND_CON_CSMUX | NAND_CON_CS_P
| NAND_CON_SE_P | NAND_CON_WP_P | NAND_CON_PRE_P
| cs_flag, EBU_NAND_CON);
/* Scan to find existence of the device */
err = nand_scan(mtd, 1);
if (err)
return err;
err = mtd_device_register(mtd, NULL, 0);
if (err)
nand_release(mtd);
return err;
}
/*
* Remove a NAND device.
*/
static int xway_nand_remove(struct platform_device *pdev)
{
struct xway_nand_data *data = platform_get_drvdata(pdev);
nand_release(nand_to_mtd(&data->chip));
return 0;
}
static const struct of_device_id xway_nand_match[] = {
{ .compatible = "lantiq,nand-xway" },
{},
};
static struct platform_driver xway_nand_driver = {
.probe = xway_nand_probe,
.remove = xway_nand_remove,
.driver = {
.name = "lantiq,nand-xway",
.of_match_table = xway_nand_match,
},
};
builtin_platform_driver(xway_nand_driver);
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