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alistair23-linux/include/linux/mtd/sh_flctl.h
Arnd Bergmann 1873315fb1 mtd: sh_flctl: pass FIFO as physical address 
By convention, the FIFO address we pass using dmaengine_slave_config
is a physical address in the form that is understood by the DMA
engine, as a dma_addr_t, phys_addr_t or resource_size_t.

The sh_flctl driver however passes a virtual __iomem address that
gets cast to dma_addr_t in the slave driver. This happens to work
on shmobile because that platform sets up an identity mapping for
its MMIO regions, but such code is not portable to other platforms,
and prevents us from ever changing the platform mapping or reusing
the driver on other architectures like ARM64 that might not have the
mapping.

We also get a warning about a type mismatch for the case that
dma_addr_t is wider than a pointer, i.e. when CONFIG_LPAE is set:

drivers/mtd/nand/sh_flctl.c: In function 'flctl_setup_dma':
drivers/mtd/nand/sh_flctl.c:163:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  cfg.dst_addr = (dma_addr_t)FLDTFIFO(flctl);

This changes the driver to instead pass the physical address of
the FIFO that is extracted from the MMIO resource, making the
code more portable and avoiding the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2015-12-18 18:27:13 -08:00

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/*
* SuperH FLCTL nand controller
*
* Copyright © 2008 Renesas Solutions Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __SH_FLCTL_H__
#define __SH_FLCTL_H__
#include <linux/completion.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/pm_qos.h>
/* FLCTL registers */
#define FLCMNCR(f) (f->reg + 0x0)
#define FLCMDCR(f) (f->reg + 0x4)
#define FLCMCDR(f) (f->reg + 0x8)
#define FLADR(f) (f->reg + 0xC)
#define FLADR2(f) (f->reg + 0x3C)
#define FLDATAR(f) (f->reg + 0x10)
#define FLDTCNTR(f) (f->reg + 0x14)
#define FLINTDMACR(f) (f->reg + 0x18)
#define FLBSYTMR(f) (f->reg + 0x1C)
#define FLBSYCNT(f) (f->reg + 0x20)
#define FLDTFIFO(f) (f->reg + 0x24)
#define FLECFIFO(f) (f->reg + 0x28)
#define FLTRCR(f) (f->reg + 0x2C)
#define FLHOLDCR(f) (f->reg + 0x38)
#define FL4ECCRESULT0(f) (f->reg + 0x80)
#define FL4ECCRESULT1(f) (f->reg + 0x84)
#define FL4ECCRESULT2(f) (f->reg + 0x88)
#define FL4ECCRESULT3(f) (f->reg + 0x8C)
#define FL4ECCCR(f) (f->reg + 0x90)
#define FL4ECCCNT(f) (f->reg + 0x94)
#define FLERRADR(f) (f->reg + 0x98)
/* FLCMNCR control bits */
#define _4ECCCNTEN (0x1 << 24)
#define _4ECCEN (0x1 << 23)
#define _4ECCCORRECT (0x1 << 22)
#define SHBUSSEL (0x1 << 20)
#define SEL_16BIT (0x1 << 19)
#define SNAND_E (0x1 << 18) /* SNAND (0=512 1=2048)*/
#define QTSEL_E (0x1 << 17)
#define ENDIAN (0x1 << 16) /* 1 = little endian */
#define FCKSEL_E (0x1 << 15)
#define ACM_SACCES_MODE (0x01 << 10)
#define NANWF_E (0x1 << 9)
#define SE_D (0x1 << 8) /* Spare area disable */
#define CE1_ENABLE (0x1 << 4) /* Chip Enable 1 */
#define CE0_ENABLE (0x1 << 3) /* Chip Enable 0 */
#define TYPESEL_SET (0x1 << 0)
/*
* Clock settings using the PULSEx registers from FLCMNCR
*
* Some hardware uses bits called PULSEx instead of FCKSEL_E and QTSEL_E
* to control the clock divider used between the High-Speed Peripheral Clock
* and the FLCTL internal clock. If so, use CLK_8_BIT_xxx for connecting 8 bit
* and CLK_16_BIT_xxx for connecting 16 bit bus bandwith NAND chips. For the 16
* bit version the divider is seperate for the pulse width of high and low
* signals.
*/
#define PULSE3 (0x1 << 27)
#define PULSE2 (0x1 << 17)
#define PULSE1 (0x1 << 15)
#define PULSE0 (0x1 << 9)
#define CLK_8B_0_5 PULSE1
#define CLK_8B_1 0x0
#define CLK_8B_1_5 (PULSE1 | PULSE2)
#define CLK_8B_2 PULSE0
#define CLK_8B_3 (PULSE0 | PULSE1 | PULSE2)
#define CLK_8B_4 (PULSE0 | PULSE2)
#define CLK_16B_6L_2H PULSE0
#define CLK_16B_9L_3H (PULSE0 | PULSE1 | PULSE2)
#define CLK_16B_12L_4H (PULSE0 | PULSE2)
/* FLCMDCR control bits */
#define ADRCNT2_E (0x1 << 31) /* 5byte address enable */
#define ADRMD_E (0x1 << 26) /* Sector address access */
#define CDSRC_E (0x1 << 25) /* Data buffer selection */
#define DOSR_E (0x1 << 24) /* Status read check */
#define SELRW (0x1 << 21) /* 0:read 1:write */
#define DOADR_E (0x1 << 20) /* Address stage execute */
#define ADRCNT_1 (0x00 << 18) /* Address data bytes: 1byte */
#define ADRCNT_2 (0x01 << 18) /* Address data bytes: 2byte */
#define ADRCNT_3 (0x02 << 18) /* Address data bytes: 3byte */
#define ADRCNT_4 (0x03 << 18) /* Address data bytes: 4byte */
#define DOCMD2_E (0x1 << 17) /* 2nd cmd stage execute */
#define DOCMD1_E (0x1 << 16) /* 1st cmd stage execute */
/* FLINTDMACR control bits */
#define ESTERINTE (0x1 << 24) /* ECC error interrupt enable */
#define AC1CLR (0x1 << 19) /* ECC FIFO clear */
#define AC0CLR (0x1 << 18) /* Data FIFO clear */
#define DREQ0EN (0x1 << 16) /* FLDTFIFODMA Request Enable */
#define ECERB (0x1 << 9) /* ECC error */
#define STERB (0x1 << 8) /* Status error */
#define STERINTE (0x1 << 4) /* Status error enable */
/* FLTRCR control bits */
#define TRSTRT (0x1 << 0) /* translation start */
#define TREND (0x1 << 1) /* translation end */
/*
* FLHOLDCR control bits
*
* HOLDEN: Bus Occupancy Enable (inverted)
* Enable this bit when the external bus might be used in between transfers.
* If not set and the bus gets used by other modules, a deadlock occurs.
*/
#define HOLDEN (0x1 << 0)
/* FL4ECCCR control bits */
#define _4ECCFA (0x1 << 2) /* 4 symbols correct fault */
#define _4ECCEND (0x1 << 1) /* 4 symbols end */
#define _4ECCEXST (0x1 << 0) /* 4 symbols exist */
#define LOOP_TIMEOUT_MAX 0x00010000
enum flctl_ecc_res_t {
FL_SUCCESS,
FL_REPAIRABLE,
FL_ERROR,
FL_TIMEOUT
};
struct dma_chan;
struct sh_flctl {
struct nand_chip chip;
struct platform_device *pdev;
struct dev_pm_qos_request pm_qos;
void __iomem *reg;
resource_size_t fifo;
uint8_t done_buff[2048 + 64]; /* max size 2048 + 64 */
int read_bytes;
unsigned int index;
int seqin_column; /* column in SEQIN cmd */
int seqin_page_addr; /* page_addr in SEQIN cmd */
uint32_t seqin_read_cmd; /* read cmd in SEQIN cmd */
int erase1_page_addr; /* page_addr in ERASE1 cmd */
uint32_t erase_ADRCNT; /* bits of FLCMDCR in ERASE1 cmd */
uint32_t rw_ADRCNT; /* bits of FLCMDCR in READ WRITE cmd */
uint32_t flcmncr_base; /* base value of FLCMNCR */
uint32_t flintdmacr_base; /* irq enable bits */
unsigned page_size:1; /* NAND page size (0 = 512, 1 = 2048) */
unsigned hwecc:1; /* Hardware ECC (0 = disabled, 1 = enabled) */
unsigned holden:1; /* Hardware has FLHOLDCR and HOLDEN is set */
unsigned qos_request:1; /* QoS request to prevent deep power shutdown */
/* DMA related objects */
struct dma_chan *chan_fifo0_rx;
struct dma_chan *chan_fifo0_tx;
struct completion dma_complete;
};
struct sh_flctl_platform_data {
struct mtd_partition *parts;
int nr_parts;
unsigned long flcmncr_val;
unsigned has_hwecc:1;
unsigned use_holden:1;
unsigned int slave_id_fifo0_tx;
unsigned int slave_id_fifo0_rx;
};
static inline struct sh_flctl *mtd_to_flctl(struct mtd_info *mtdinfo)
{
return container_of(mtd_to_nand(mtdinfo), struct sh_flctl, chip);
}
#endif /* __SH_FLCTL_H__ */
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