From 50a9d37efdfa502fafe48a1de604cd5d84a0d5e9 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sat, 27 Aug 2011 20:08:14 +0200
Subject: [PATCH 37/70] MIPS: lantiq: add xway nand driver
This patch adds a nand driver for XWAY SoCs. The patch makes use of the
plat_nand driver. As with the EBU NOR driver merged in 3.0, we have the
endianess swap problem on read. To workaround this problem we make the
read_byte() callback available via the plat_nand driver causing the nand
layer to do byte reads.
Signed-off-by: John Crispin <blogic@openwrt.org>
TODO : memory ranges
cs lines
plat dev
ebu2 and not ebu1 ?
---
.../mips/include/asm/mach-lantiq/xway/lantiq_soc.h | 2 +
arch/mips/lantiq/xway/Makefile | 2 +-
arch/mips/lantiq/xway/devices.h | 1 +
arch/mips/lantiq/xway/nand.c | 216 ++++++++++++++++++++
drivers/mtd/nand/plat_nand.c | 1 +
include/linux/mtd/nand.h | 1 +
6 files changed, 222 insertions(+), 1 deletions(-)
create mode 100644 arch/mips/lantiq/xway/nand.c
--- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
+++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
@@ -145,6 +145,8 @@
/* register access macros for EBU and CGU */
#define ltq_ebu_w32(x, y) ltq_w32((x), ltq_ebu_membase + (y))
#define ltq_ebu_r32(x) ltq_r32(ltq_ebu_membase + (x))
+#define ltq_ebu_w32_mask(x, y, z) \
+ ltq_w32_mask(x, y, ltq_ebu_membase + (z))
#define ltq_cgu_w32(x, y) ltq_w32((x), ltq_cgu_membase + (y))
#define ltq_cgu_r32(x) ltq_r32(ltq_cgu_membase + (x))
--- a/arch/mips/lantiq/xway/Makefile
+++ b/arch/mips/lantiq/xway/Makefile
@@ -1,4 +1,4 @@
-obj-y := sysctrl.o reset.o gpio.o gpio_stp.o gpio_ebu.o devices.o dma.o clk.o prom.o
+obj-y := sysctrl.o reset.o gpio.o gpio_stp.o gpio_ebu.o devices.o dma.o clk.o prom.o nand.o
obj-$(CONFIG_LANTIQ_MACH_EASY50712) += mach-easy50712.o
obj-$(CONFIG_LANTIQ_MACH_EASY50601) += mach-easy50601.o
--- a/arch/mips/lantiq/xway/devices.h
+++ b/arch/mips/lantiq/xway/devices.h
@@ -16,5 +16,6 @@ extern void ltq_register_gpio(void);
extern void ltq_register_gpio_stp(void);
extern void ltq_register_ase_asc(void);
extern void ltq_register_etop(struct ltq_eth_data *eth);
+extern void xway_register_nand(struct mtd_partition *parts, int count);
#endif
--- /dev/null
+++ b/arch/mips/lantiq/xway/nand.c
@@ -0,0 +1,216 @@
+/*
+ * 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 (C) 2010 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/mtd/physmap.h>
+#include <linux/mtd/nand.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <lantiq_soc.h>
+#include <lantiq_irq.h>
+#include <lantiq_platform.h>
+
+#include "devices.h"
+
+/* nand registers */
+#define LTQ_EBU_NAND_WAIT 0xB4
+#define LTQ_EBU_NAND_ECC0 0xB8
+#define LTQ_EBU_NAND_ECC_AC 0xBC
+#define LTQ_EBU_NAND_CON 0xB0
+#define LTQ_EBU_ADDSEL1 0x24
+
+/* gpio definitions */
+#define PIN_ALE 13
+#define PIN_CLE 24
+#define PIN_CS1 23
+#define PIN_RDY 48 /* NFLASH_READY */
+#define PIN_RD 49 /* NFLASH_READ_N */
+
+#define NAND_CMD_ALE (1 << 2)
+#define NAND_CMD_CLE (1 << 3)
+#define NAND_CMD_CS (1 << 4)
+#define NAND_WRITE_CMD_RESET 0xff
+#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)
+#define NAND_WAIT_WR_C (1 << 3)
+#define NAND_WAIT_RD (0x1)
+
+#define ADDSEL1_MASK(x) (x << 4)
+#define ADDSEL1_REGEN 1
+#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_NANDM 1
+#define NAND_CON_CSMUX (1 << 1)
+#define NAND_CON_CS_P (1 << 4)
+#define NAND_CON_SE_P (1 << 5)
+#define NAND_CON_WP_P (1 << 6)
+#define NAND_CON_PRE_P (1 << 7)
+#define NAND_CON_IN_CS0 0
+#define NAND_CON_OUT_CS0 0
+#define NAND_CON_IN_CS1 (1 << 8)
+#define NAND_CON_OUT_CS1 (1 << 10)
+#define NAND_CON_CE (1 << 20)
+
+#define NAND_BASE_ADDRESS (KSEG1 | 0x14000000)
+
+static const char *part_probes[] = { "cmdlinepart", NULL };
+
+static void xway_select_chip(struct mtd_info *mtd, int chip)
+{
+ switch (chip) {
+ case -1:
+ ltq_ebu_w32_mask(NAND_CON_CE, 0, LTQ_EBU_NAND_CON);
+ ltq_ebu_w32_mask(NAND_CON_NANDM, 0, LTQ_EBU_NAND_CON);
+ break;
+ case 0:
+ ltq_ebu_w32_mask(0, NAND_CON_NANDM, LTQ_EBU_NAND_CON);
+ ltq_ebu_w32_mask(0, NAND_CON_CE, LTQ_EBU_NAND_CON);
+ /* reset the nand chip */
+ while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
+ ;
+ ltq_w32(NAND_WRITE_CMD_RESET,
+ ((u32 *) (NAND_BASE_ADDRESS | NAND_WRITE_CMD)));
+ break;
+ default:
+ BUG();
+ }
+}
+
+static void xway_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
+{
+ struct nand_chip *this = mtd->priv;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ if (ctrl & NAND_CLE)
+ this->IO_ADDR_W = (void __iomem *)
+ (NAND_BASE_ADDRESS | NAND_WRITE_CMD);
+ else if (ctrl & NAND_ALE)
+ this->IO_ADDR_W = (void __iomem *)
+ (NAND_BASE_ADDRESS | NAND_WRITE_ADDR);
+ }
+
+ if (data != NAND_CMD_NONE) {
+ *(volatile u8*) ((u32) this->IO_ADDR_W) = data;
+ while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
+ ;
+ }
+}
+
+static int xway_dev_ready(struct mtd_info *mtd)
+{
+ return ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_RD;
+}
+
+void nand_write(unsigned int addr, unsigned int val)
+{
+ ltq_w32(val, ((u32 *) (NAND_BASE_ADDRESS | addr)));
+ while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
+ ;
+}
+
+unsigned char xway_read_byte(struct mtd_info *mtd)
+{
+ return ltq_r8((void __iomem *)(NAND_BASE_ADDRESS | (NAND_READ_DATA)));
+}
+
+static void xway_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ {
+ unsigned char res8 = ltq_r8((void __iomem *)(NAND_BASE_ADDRESS | (NAND_READ_DATA)));
+ buf[i] = res8;
+ }
+}
+
+static void xway_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ {
+ ltq_w8(buf[i], ((u32*)(NAND_BASE_ADDRESS | (NAND_WRITE_DATA))));
+ while((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0);
+ }
+}
+
+int xway_probe(struct platform_device *pdev)
+{
+ /* might need this later ?
+ ltq_gpio_request(PIN_CS1, 2, 1, "NAND_CS1");
+ */
+ ltq_gpio_request(&pdev->dev, PIN_CLE, 2, 1, "NAND_CLE");
+ ltq_gpio_request(&pdev->dev, PIN_ALE, 2, 1, "NAND_ALE");
+ if (ltq_is_ar9() || ltq_is_vr9()) {
+ ltq_gpio_request(&pdev->dev, PIN_RDY, 2, 0, "NAND_BSY");
+ ltq_gpio_request(&pdev->dev, PIN_RD, 2, 1, "NAND_RD");
+ }
+
+ ltq_ebu_w32((NAND_BASE_ADDRESS & 0x1fffff00)
+ | ADDSEL1_MASK(3) | ADDSEL1_REGEN, LTQ_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
+ | NAND_CON_IN_CS0 | NAND_CON_OUT_CS0, LTQ_EBU_NAND_CON);
+
+ ltq_w32(NAND_WRITE_CMD_RESET,
+ ((u32 *) (NAND_BASE_ADDRESS | NAND_WRITE_CMD)));
+ while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
+ ;
+
+ return 0;
+}
+
+static struct platform_nand_data falcon_flash_nand_data = {
+ .chip = {
+ .nr_chips = 1,
+ .chip_delay = 30,
+ .part_probe_types = part_probes,
+ },
+ .ctrl = {
+ .probe = xway_probe,
+ .cmd_ctrl = xway_cmd_ctrl,
+ .dev_ready = xway_dev_ready,
+ .select_chip = xway_select_chip,
+ .read_byte = xway_read_byte,
+ .read_buf = xway_read_buf,
+ .write_buf = xway_write_buf,
+ }
+};
+
+static struct resource ltq_nand_res =
+ MEM_RES("nand", 0x14000000, 0x7ffffff);
+
+static struct platform_device ltq_flash_nand = {
+ .name = "gen_nand",
+ .id = -1,
+ .num_resources = 1,
+ .resource = <q_nand_res,
+ .dev = {
+ .platform_data = &falcon_flash_nand_data,
+ },
+};
+
+void __init xway_register_nand(struct mtd_partition *parts, int count)
+{
+ falcon_flash_nand_data.chip.partitions = parts;
+ falcon_flash_nand_data.chip.nr_partitions = count;
+ platform_device_register(<q_flash_nand);
+}
--- a/drivers/mtd/nand/plat_nand.c
+++ b/drivers/mtd/nand/plat_nand.c
@@ -75,6 +75,7 @@ static int __devinit plat_nand_probe(str
data->chip.select_chip = pdata->ctrl.select_chip;
data->chip.write_buf = pdata->ctrl.write_buf;
data->chip.read_buf = pdata->ctrl.read_buf;
+ data->chip.read_byte = pdata->ctrl.read_byte;
data->chip.chip_delay = pdata->chip.chip_delay;
data->chip.options |= pdata->chip.options;
data->chip.bbt_options |= pdata->chip.bbt_options;
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -652,6 +652,7 @@ struct platform_nand_ctrl {
void (*cmd_ctrl)(struct mtd_info *mtd, int dat, unsigned int ctrl);
void (*write_buf)(struct mtd_info *mtd, const uint8_t *buf, int len);
void (*read_buf)(struct mtd_info *mtd, uint8_t *buf, int len);
+ unsigned char (*read_byte)(struct mtd_info *mtd);
void *priv;
};