![Colin Ian King](/assets/img/avatar_default.png)
Checking for ret < 0 is redundant because a previous check on ret being non-zero already handles the ret < 0 case. Remove the redundant code. Found by CoverityScan, CID#1398863, CID#1398864 Signed-off-by: Colin Ian King <colin.king@canonical.com> Reviewed-by: Richard Weinberger <richard@nod.at> Acked-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
1304 lines
33 KiB
C
1304 lines
33 KiB
C
/*
|
|
* Driver for Cadence QSPI Controller
|
|
*
|
|
* Copyright Altera Corporation (C) 2012-2014. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <linux/clk.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/mtd/spi-nor.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/timer.h>
|
|
|
|
#define CQSPI_NAME "cadence-qspi"
|
|
#define CQSPI_MAX_CHIPSELECT 16
|
|
|
|
struct cqspi_st;
|
|
|
|
struct cqspi_flash_pdata {
|
|
struct spi_nor nor;
|
|
struct cqspi_st *cqspi;
|
|
u32 clk_rate;
|
|
u32 read_delay;
|
|
u32 tshsl_ns;
|
|
u32 tsd2d_ns;
|
|
u32 tchsh_ns;
|
|
u32 tslch_ns;
|
|
u8 inst_width;
|
|
u8 addr_width;
|
|
u8 data_width;
|
|
u8 cs;
|
|
bool registered;
|
|
};
|
|
|
|
struct cqspi_st {
|
|
struct platform_device *pdev;
|
|
|
|
struct clk *clk;
|
|
unsigned int sclk;
|
|
|
|
void __iomem *iobase;
|
|
void __iomem *ahb_base;
|
|
struct completion transfer_complete;
|
|
struct mutex bus_mutex;
|
|
|
|
int current_cs;
|
|
int current_page_size;
|
|
int current_erase_size;
|
|
int current_addr_width;
|
|
unsigned long master_ref_clk_hz;
|
|
bool is_decoded_cs;
|
|
u32 fifo_depth;
|
|
u32 fifo_width;
|
|
u32 trigger_address;
|
|
struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
|
|
};
|
|
|
|
/* Operation timeout value */
|
|
#define CQSPI_TIMEOUT_MS 500
|
|
#define CQSPI_READ_TIMEOUT_MS 10
|
|
|
|
/* Instruction type */
|
|
#define CQSPI_INST_TYPE_SINGLE 0
|
|
#define CQSPI_INST_TYPE_DUAL 1
|
|
#define CQSPI_INST_TYPE_QUAD 2
|
|
|
|
#define CQSPI_DUMMY_CLKS_PER_BYTE 8
|
|
#define CQSPI_DUMMY_BYTES_MAX 4
|
|
#define CQSPI_DUMMY_CLKS_MAX 31
|
|
|
|
#define CQSPI_STIG_DATA_LEN_MAX 8
|
|
|
|
/* Register map */
|
|
#define CQSPI_REG_CONFIG 0x00
|
|
#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0)
|
|
#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9)
|
|
#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
|
|
#define CQSPI_REG_CONFIG_DMA_MASK BIT(15)
|
|
#define CQSPI_REG_CONFIG_BAUD_LSB 19
|
|
#define CQSPI_REG_CONFIG_IDLE_LSB 31
|
|
#define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF
|
|
#define CQSPI_REG_CONFIG_BAUD_MASK 0xF
|
|
|
|
#define CQSPI_REG_RD_INSTR 0x04
|
|
#define CQSPI_REG_RD_INSTR_OPCODE_LSB 0
|
|
#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8
|
|
#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12
|
|
#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16
|
|
#define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20
|
|
#define CQSPI_REG_RD_INSTR_DUMMY_LSB 24
|
|
#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3
|
|
#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3
|
|
#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3
|
|
#define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F
|
|
|
|
#define CQSPI_REG_WR_INSTR 0x08
|
|
#define CQSPI_REG_WR_INSTR_OPCODE_LSB 0
|
|
#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12
|
|
#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16
|
|
|
|
#define CQSPI_REG_DELAY 0x0C
|
|
#define CQSPI_REG_DELAY_TSLCH_LSB 0
|
|
#define CQSPI_REG_DELAY_TCHSH_LSB 8
|
|
#define CQSPI_REG_DELAY_TSD2D_LSB 16
|
|
#define CQSPI_REG_DELAY_TSHSL_LSB 24
|
|
#define CQSPI_REG_DELAY_TSLCH_MASK 0xFF
|
|
#define CQSPI_REG_DELAY_TCHSH_MASK 0xFF
|
|
#define CQSPI_REG_DELAY_TSD2D_MASK 0xFF
|
|
#define CQSPI_REG_DELAY_TSHSL_MASK 0xFF
|
|
|
|
#define CQSPI_REG_READCAPTURE 0x10
|
|
#define CQSPI_REG_READCAPTURE_BYPASS_LSB 0
|
|
#define CQSPI_REG_READCAPTURE_DELAY_LSB 1
|
|
#define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF
|
|
|
|
#define CQSPI_REG_SIZE 0x14
|
|
#define CQSPI_REG_SIZE_ADDRESS_LSB 0
|
|
#define CQSPI_REG_SIZE_PAGE_LSB 4
|
|
#define CQSPI_REG_SIZE_BLOCK_LSB 16
|
|
#define CQSPI_REG_SIZE_ADDRESS_MASK 0xF
|
|
#define CQSPI_REG_SIZE_PAGE_MASK 0xFFF
|
|
#define CQSPI_REG_SIZE_BLOCK_MASK 0x3F
|
|
|
|
#define CQSPI_REG_SRAMPARTITION 0x18
|
|
#define CQSPI_REG_INDIRECTTRIGGER 0x1C
|
|
|
|
#define CQSPI_REG_DMA 0x20
|
|
#define CQSPI_REG_DMA_SINGLE_LSB 0
|
|
#define CQSPI_REG_DMA_BURST_LSB 8
|
|
#define CQSPI_REG_DMA_SINGLE_MASK 0xFF
|
|
#define CQSPI_REG_DMA_BURST_MASK 0xFF
|
|
|
|
#define CQSPI_REG_REMAP 0x24
|
|
#define CQSPI_REG_MODE_BIT 0x28
|
|
|
|
#define CQSPI_REG_SDRAMLEVEL 0x2C
|
|
#define CQSPI_REG_SDRAMLEVEL_RD_LSB 0
|
|
#define CQSPI_REG_SDRAMLEVEL_WR_LSB 16
|
|
#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF
|
|
#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF
|
|
|
|
#define CQSPI_REG_IRQSTATUS 0x40
|
|
#define CQSPI_REG_IRQMASK 0x44
|
|
|
|
#define CQSPI_REG_INDIRECTRD 0x60
|
|
#define CQSPI_REG_INDIRECTRD_START_MASK BIT(0)
|
|
#define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1)
|
|
#define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5)
|
|
|
|
#define CQSPI_REG_INDIRECTRDWATERMARK 0x64
|
|
#define CQSPI_REG_INDIRECTRDSTARTADDR 0x68
|
|
#define CQSPI_REG_INDIRECTRDBYTES 0x6C
|
|
|
|
#define CQSPI_REG_CMDCTRL 0x90
|
|
#define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0)
|
|
#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1)
|
|
#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12
|
|
#define CQSPI_REG_CMDCTRL_WR_EN_LSB 15
|
|
#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16
|
|
#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19
|
|
#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20
|
|
#define CQSPI_REG_CMDCTRL_RD_EN_LSB 23
|
|
#define CQSPI_REG_CMDCTRL_OPCODE_LSB 24
|
|
#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7
|
|
#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3
|
|
#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7
|
|
|
|
#define CQSPI_REG_INDIRECTWR 0x70
|
|
#define CQSPI_REG_INDIRECTWR_START_MASK BIT(0)
|
|
#define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1)
|
|
#define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5)
|
|
|
|
#define CQSPI_REG_INDIRECTWRWATERMARK 0x74
|
|
#define CQSPI_REG_INDIRECTWRSTARTADDR 0x78
|
|
#define CQSPI_REG_INDIRECTWRBYTES 0x7C
|
|
|
|
#define CQSPI_REG_CMDADDRESS 0x94
|
|
#define CQSPI_REG_CMDREADDATALOWER 0xA0
|
|
#define CQSPI_REG_CMDREADDATAUPPER 0xA4
|
|
#define CQSPI_REG_CMDWRITEDATALOWER 0xA8
|
|
#define CQSPI_REG_CMDWRITEDATAUPPER 0xAC
|
|
|
|
/* Interrupt status bits */
|
|
#define CQSPI_REG_IRQ_MODE_ERR BIT(0)
|
|
#define CQSPI_REG_IRQ_UNDERFLOW BIT(1)
|
|
#define CQSPI_REG_IRQ_IND_COMP BIT(2)
|
|
#define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3)
|
|
#define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4)
|
|
#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5)
|
|
#define CQSPI_REG_IRQ_WATERMARK BIT(6)
|
|
#define CQSPI_REG_IRQ_IND_SRAM_FULL BIT(12)
|
|
|
|
#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \
|
|
CQSPI_REG_IRQ_IND_SRAM_FULL | \
|
|
CQSPI_REG_IRQ_IND_COMP)
|
|
|
|
#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \
|
|
CQSPI_REG_IRQ_WATERMARK | \
|
|
CQSPI_REG_IRQ_UNDERFLOW)
|
|
|
|
#define CQSPI_IRQ_STATUS_MASK 0x1FFFF
|
|
|
|
static int cqspi_wait_for_bit(void __iomem *reg, const u32 mask, bool clear)
|
|
{
|
|
unsigned long end = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS);
|
|
u32 val;
|
|
|
|
while (1) {
|
|
val = readl(reg);
|
|
if (clear)
|
|
val = ~val;
|
|
val &= mask;
|
|
|
|
if (val == mask)
|
|
return 0;
|
|
|
|
if (time_after(jiffies, end))
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
static bool cqspi_is_idle(struct cqspi_st *cqspi)
|
|
{
|
|
u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
|
|
|
|
return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB);
|
|
}
|
|
|
|
static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi)
|
|
{
|
|
u32 reg = readl(cqspi->iobase + CQSPI_REG_SDRAMLEVEL);
|
|
|
|
reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB;
|
|
return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
|
|
}
|
|
|
|
static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
|
|
{
|
|
struct cqspi_st *cqspi = dev;
|
|
unsigned int irq_status;
|
|
|
|
/* Read interrupt status */
|
|
irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS);
|
|
|
|
/* Clear interrupt */
|
|
writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS);
|
|
|
|
irq_status &= CQSPI_IRQ_MASK_RD | CQSPI_IRQ_MASK_WR;
|
|
|
|
if (irq_status)
|
|
complete(&cqspi->transfer_complete);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static unsigned int cqspi_calc_rdreg(struct spi_nor *nor, const u8 opcode)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
u32 rdreg = 0;
|
|
|
|
rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB;
|
|
rdreg |= f_pdata->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB;
|
|
rdreg |= f_pdata->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
|
|
|
|
return rdreg;
|
|
}
|
|
|
|
static int cqspi_wait_idle(struct cqspi_st *cqspi)
|
|
{
|
|
const unsigned int poll_idle_retry = 3;
|
|
unsigned int count = 0;
|
|
unsigned long timeout;
|
|
|
|
timeout = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS);
|
|
while (1) {
|
|
/*
|
|
* Read few times in succession to ensure the controller
|
|
* is indeed idle, that is, the bit does not transition
|
|
* low again.
|
|
*/
|
|
if (cqspi_is_idle(cqspi))
|
|
count++;
|
|
else
|
|
count = 0;
|
|
|
|
if (count >= poll_idle_retry)
|
|
return 0;
|
|
|
|
if (time_after(jiffies, timeout)) {
|
|
/* Timeout, in busy mode. */
|
|
dev_err(&cqspi->pdev->dev,
|
|
"QSPI is still busy after %dms timeout.\n",
|
|
CQSPI_TIMEOUT_MS);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
cpu_relax();
|
|
}
|
|
}
|
|
|
|
static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
|
|
{
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
int ret;
|
|
|
|
/* Write the CMDCTRL without start execution. */
|
|
writel(reg, reg_base + CQSPI_REG_CMDCTRL);
|
|
/* Start execute */
|
|
reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK;
|
|
writel(reg, reg_base + CQSPI_REG_CMDCTRL);
|
|
|
|
/* Polling for completion. */
|
|
ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_CMDCTRL,
|
|
CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1);
|
|
if (ret) {
|
|
dev_err(&cqspi->pdev->dev,
|
|
"Flash command execution timed out.\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Polling QSPI idle status. */
|
|
return cqspi_wait_idle(cqspi);
|
|
}
|
|
|
|
static int cqspi_command_read(struct spi_nor *nor,
|
|
const u8 *txbuf, const unsigned n_tx,
|
|
u8 *rxbuf, const unsigned n_rx)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int rdreg;
|
|
unsigned int reg;
|
|
unsigned int read_len;
|
|
int status;
|
|
|
|
if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
|
|
dev_err(nor->dev, "Invalid input argument, len %d rxbuf 0x%p\n",
|
|
n_rx, rxbuf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
|
|
|
|
rdreg = cqspi_calc_rdreg(nor, txbuf[0]);
|
|
writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);
|
|
|
|
reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
|
|
|
|
/* 0 means 1 byte. */
|
|
reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
|
|
<< CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
|
|
status = cqspi_exec_flash_cmd(cqspi, reg);
|
|
if (status)
|
|
return status;
|
|
|
|
reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
|
|
|
|
/* Put the read value into rx_buf */
|
|
read_len = (n_rx > 4) ? 4 : n_rx;
|
|
memcpy(rxbuf, ®, read_len);
|
|
rxbuf += read_len;
|
|
|
|
if (n_rx > 4) {
|
|
reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
|
|
|
|
read_len = n_rx - read_len;
|
|
memcpy(rxbuf, ®, read_len);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
|
|
const u8 *txbuf, const unsigned n_tx)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int reg;
|
|
unsigned int data;
|
|
int ret;
|
|
|
|
if (n_tx > 4 || (n_tx && !txbuf)) {
|
|
dev_err(nor->dev,
|
|
"Invalid input argument, cmdlen %d txbuf 0x%p\n",
|
|
n_tx, txbuf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
|
|
if (n_tx) {
|
|
reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
|
|
reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
|
|
<< CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
|
|
data = 0;
|
|
memcpy(&data, txbuf, n_tx);
|
|
writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
|
|
}
|
|
|
|
ret = cqspi_exec_flash_cmd(cqspi, reg);
|
|
return ret;
|
|
}
|
|
|
|
static int cqspi_command_write_addr(struct spi_nor *nor,
|
|
const u8 opcode, const unsigned int addr)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int reg;
|
|
|
|
reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
|
|
reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
|
|
reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
|
|
<< CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
|
|
|
|
writel(addr, reg_base + CQSPI_REG_CMDADDRESS);
|
|
|
|
return cqspi_exec_flash_cmd(cqspi, reg);
|
|
}
|
|
|
|
static int cqspi_indirect_read_setup(struct spi_nor *nor,
|
|
const unsigned int from_addr)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int dummy_clk = 0;
|
|
unsigned int reg;
|
|
|
|
writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
|
|
|
|
reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
|
|
reg |= cqspi_calc_rdreg(nor, nor->read_opcode);
|
|
|
|
/* Setup dummy clock cycles */
|
|
dummy_clk = nor->read_dummy;
|
|
if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
|
|
dummy_clk = CQSPI_DUMMY_CLKS_MAX;
|
|
|
|
if (dummy_clk / 8) {
|
|
reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
|
|
/* Set mode bits high to ensure chip doesn't enter XIP */
|
|
writel(0xFF, reg_base + CQSPI_REG_MODE_BIT);
|
|
|
|
/* Need to subtract the mode byte (8 clocks). */
|
|
if (f_pdata->inst_width != CQSPI_INST_TYPE_QUAD)
|
|
dummy_clk -= 8;
|
|
|
|
if (dummy_clk)
|
|
reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
|
|
<< CQSPI_REG_RD_INSTR_DUMMY_LSB;
|
|
}
|
|
|
|
writel(reg, reg_base + CQSPI_REG_RD_INSTR);
|
|
|
|
/* Set address width */
|
|
reg = readl(reg_base + CQSPI_REG_SIZE);
|
|
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
|
|
reg |= (nor->addr_width - 1);
|
|
writel(reg, reg_base + CQSPI_REG_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static int cqspi_indirect_read_execute(struct spi_nor *nor,
|
|
u8 *rxbuf, const unsigned n_rx)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
void __iomem *ahb_base = cqspi->ahb_base;
|
|
unsigned int remaining = n_rx;
|
|
unsigned int bytes_to_read = 0;
|
|
int ret = 0;
|
|
|
|
writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
|
|
|
|
/* Clear all interrupts. */
|
|
writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
|
|
|
|
writel(CQSPI_IRQ_MASK_RD, reg_base + CQSPI_REG_IRQMASK);
|
|
|
|
reinit_completion(&cqspi->transfer_complete);
|
|
writel(CQSPI_REG_INDIRECTRD_START_MASK,
|
|
reg_base + CQSPI_REG_INDIRECTRD);
|
|
|
|
while (remaining > 0) {
|
|
ret = wait_for_completion_timeout(&cqspi->transfer_complete,
|
|
msecs_to_jiffies
|
|
(CQSPI_READ_TIMEOUT_MS));
|
|
|
|
bytes_to_read = cqspi_get_rd_sram_level(cqspi);
|
|
|
|
if (!ret && bytes_to_read == 0) {
|
|
dev_err(nor->dev, "Indirect read timeout, no bytes\n");
|
|
ret = -ETIMEDOUT;
|
|
goto failrd;
|
|
}
|
|
|
|
while (bytes_to_read != 0) {
|
|
bytes_to_read *= cqspi->fifo_width;
|
|
bytes_to_read = bytes_to_read > remaining ?
|
|
remaining : bytes_to_read;
|
|
ioread32_rep(ahb_base, rxbuf,
|
|
DIV_ROUND_UP(bytes_to_read, 4));
|
|
rxbuf += bytes_to_read;
|
|
remaining -= bytes_to_read;
|
|
bytes_to_read = cqspi_get_rd_sram_level(cqspi);
|
|
}
|
|
|
|
if (remaining > 0)
|
|
reinit_completion(&cqspi->transfer_complete);
|
|
}
|
|
|
|
/* Check indirect done status */
|
|
ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD,
|
|
CQSPI_REG_INDIRECTRD_DONE_MASK, 0);
|
|
if (ret) {
|
|
dev_err(nor->dev,
|
|
"Indirect read completion error (%i)\n", ret);
|
|
goto failrd;
|
|
}
|
|
|
|
/* Disable interrupt */
|
|
writel(0, reg_base + CQSPI_REG_IRQMASK);
|
|
|
|
/* Clear indirect completion status */
|
|
writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD);
|
|
|
|
return 0;
|
|
|
|
failrd:
|
|
/* Disable interrupt */
|
|
writel(0, reg_base + CQSPI_REG_IRQMASK);
|
|
|
|
/* Cancel the indirect read */
|
|
writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
|
|
reg_base + CQSPI_REG_INDIRECTRD);
|
|
return ret;
|
|
}
|
|
|
|
static int cqspi_indirect_write_setup(struct spi_nor *nor,
|
|
const unsigned int to_addr)
|
|
{
|
|
unsigned int reg;
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
|
|
/* Set opcode. */
|
|
reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
|
|
writel(reg, reg_base + CQSPI_REG_WR_INSTR);
|
|
reg = cqspi_calc_rdreg(nor, nor->program_opcode);
|
|
writel(reg, reg_base + CQSPI_REG_RD_INSTR);
|
|
|
|
writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
|
|
|
|
reg = readl(reg_base + CQSPI_REG_SIZE);
|
|
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
|
|
reg |= (nor->addr_width - 1);
|
|
writel(reg, reg_base + CQSPI_REG_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static int cqspi_indirect_write_execute(struct spi_nor *nor,
|
|
const u8 *txbuf, const unsigned n_tx)
|
|
{
|
|
const unsigned int page_size = nor->page_size;
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int remaining = n_tx;
|
|
unsigned int write_bytes;
|
|
int ret;
|
|
|
|
writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
|
|
|
|
/* Clear all interrupts. */
|
|
writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
|
|
|
|
writel(CQSPI_IRQ_MASK_WR, reg_base + CQSPI_REG_IRQMASK);
|
|
|
|
reinit_completion(&cqspi->transfer_complete);
|
|
writel(CQSPI_REG_INDIRECTWR_START_MASK,
|
|
reg_base + CQSPI_REG_INDIRECTWR);
|
|
|
|
while (remaining > 0) {
|
|
write_bytes = remaining > page_size ? page_size : remaining;
|
|
iowrite32_rep(cqspi->ahb_base, txbuf,
|
|
DIV_ROUND_UP(write_bytes, 4));
|
|
|
|
ret = wait_for_completion_timeout(&cqspi->transfer_complete,
|
|
msecs_to_jiffies
|
|
(CQSPI_TIMEOUT_MS));
|
|
if (!ret) {
|
|
dev_err(nor->dev, "Indirect write timeout\n");
|
|
ret = -ETIMEDOUT;
|
|
goto failwr;
|
|
}
|
|
|
|
txbuf += write_bytes;
|
|
remaining -= write_bytes;
|
|
|
|
if (remaining > 0)
|
|
reinit_completion(&cqspi->transfer_complete);
|
|
}
|
|
|
|
/* Check indirect done status */
|
|
ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR,
|
|
CQSPI_REG_INDIRECTWR_DONE_MASK, 0);
|
|
if (ret) {
|
|
dev_err(nor->dev,
|
|
"Indirect write completion error (%i)\n", ret);
|
|
goto failwr;
|
|
}
|
|
|
|
/* Disable interrupt. */
|
|
writel(0, reg_base + CQSPI_REG_IRQMASK);
|
|
|
|
/* Clear indirect completion status */
|
|
writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR);
|
|
|
|
cqspi_wait_idle(cqspi);
|
|
|
|
return 0;
|
|
|
|
failwr:
|
|
/* Disable interrupt. */
|
|
writel(0, reg_base + CQSPI_REG_IRQMASK);
|
|
|
|
/* Cancel the indirect write */
|
|
writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
|
|
reg_base + CQSPI_REG_INDIRECTWR);
|
|
return ret;
|
|
}
|
|
|
|
static void cqspi_chipselect(struct spi_nor *nor)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int chip_select = f_pdata->cs;
|
|
unsigned int reg;
|
|
|
|
reg = readl(reg_base + CQSPI_REG_CONFIG);
|
|
if (cqspi->is_decoded_cs) {
|
|
reg |= CQSPI_REG_CONFIG_DECODE_MASK;
|
|
} else {
|
|
reg &= ~CQSPI_REG_CONFIG_DECODE_MASK;
|
|
|
|
/* Convert CS if without decoder.
|
|
* CS0 to 4b'1110
|
|
* CS1 to 4b'1101
|
|
* CS2 to 4b'1011
|
|
* CS3 to 4b'0111
|
|
*/
|
|
chip_select = 0xF & ~(1 << chip_select);
|
|
}
|
|
|
|
reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK
|
|
<< CQSPI_REG_CONFIG_CHIPSELECT_LSB);
|
|
reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK)
|
|
<< CQSPI_REG_CONFIG_CHIPSELECT_LSB;
|
|
writel(reg, reg_base + CQSPI_REG_CONFIG);
|
|
}
|
|
|
|
static void cqspi_configure_cs_and_sizes(struct spi_nor *nor)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *iobase = cqspi->iobase;
|
|
unsigned int reg;
|
|
|
|
/* configure page size and block size. */
|
|
reg = readl(iobase + CQSPI_REG_SIZE);
|
|
reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
|
|
reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
|
|
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
|
|
reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB);
|
|
reg |= (ilog2(nor->mtd.erasesize) << CQSPI_REG_SIZE_BLOCK_LSB);
|
|
reg |= (nor->addr_width - 1);
|
|
writel(reg, iobase + CQSPI_REG_SIZE);
|
|
|
|
/* configure the chip select */
|
|
cqspi_chipselect(nor);
|
|
|
|
/* Store the new configuration of the controller */
|
|
cqspi->current_page_size = nor->page_size;
|
|
cqspi->current_erase_size = nor->mtd.erasesize;
|
|
cqspi->current_addr_width = nor->addr_width;
|
|
}
|
|
|
|
static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz,
|
|
const unsigned int ns_val)
|
|
{
|
|
unsigned int ticks;
|
|
|
|
ticks = ref_clk_hz / 1000; /* kHz */
|
|
ticks = DIV_ROUND_UP(ticks * ns_val, 1000000);
|
|
|
|
return ticks;
|
|
}
|
|
|
|
static void cqspi_delay(struct spi_nor *nor)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
void __iomem *iobase = cqspi->iobase;
|
|
const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
|
|
unsigned int tshsl, tchsh, tslch, tsd2d;
|
|
unsigned int reg;
|
|
unsigned int tsclk;
|
|
|
|
/* calculate the number of ref ticks for one sclk tick */
|
|
tsclk = DIV_ROUND_UP(ref_clk_hz, cqspi->sclk);
|
|
|
|
tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns);
|
|
/* this particular value must be at least one sclk */
|
|
if (tshsl < tsclk)
|
|
tshsl = tsclk;
|
|
|
|
tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns);
|
|
tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns);
|
|
tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns);
|
|
|
|
reg = (tshsl & CQSPI_REG_DELAY_TSHSL_MASK)
|
|
<< CQSPI_REG_DELAY_TSHSL_LSB;
|
|
reg |= (tchsh & CQSPI_REG_DELAY_TCHSH_MASK)
|
|
<< CQSPI_REG_DELAY_TCHSH_LSB;
|
|
reg |= (tslch & CQSPI_REG_DELAY_TSLCH_MASK)
|
|
<< CQSPI_REG_DELAY_TSLCH_LSB;
|
|
reg |= (tsd2d & CQSPI_REG_DELAY_TSD2D_MASK)
|
|
<< CQSPI_REG_DELAY_TSD2D_LSB;
|
|
writel(reg, iobase + CQSPI_REG_DELAY);
|
|
}
|
|
|
|
static void cqspi_config_baudrate_div(struct cqspi_st *cqspi)
|
|
{
|
|
const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
u32 reg, div;
|
|
|
|
/* Recalculate the baudrate divisor based on QSPI specification. */
|
|
div = DIV_ROUND_UP(ref_clk_hz, 2 * cqspi->sclk) - 1;
|
|
|
|
reg = readl(reg_base + CQSPI_REG_CONFIG);
|
|
reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
|
|
reg |= (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
|
|
writel(reg, reg_base + CQSPI_REG_CONFIG);
|
|
}
|
|
|
|
static void cqspi_readdata_capture(struct cqspi_st *cqspi,
|
|
const unsigned int bypass,
|
|
const unsigned int delay)
|
|
{
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int reg;
|
|
|
|
reg = readl(reg_base + CQSPI_REG_READCAPTURE);
|
|
|
|
if (bypass)
|
|
reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
|
|
else
|
|
reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
|
|
|
|
reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK
|
|
<< CQSPI_REG_READCAPTURE_DELAY_LSB);
|
|
|
|
reg |= (delay & CQSPI_REG_READCAPTURE_DELAY_MASK)
|
|
<< CQSPI_REG_READCAPTURE_DELAY_LSB;
|
|
|
|
writel(reg, reg_base + CQSPI_REG_READCAPTURE);
|
|
}
|
|
|
|
static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable)
|
|
{
|
|
void __iomem *reg_base = cqspi->iobase;
|
|
unsigned int reg;
|
|
|
|
reg = readl(reg_base + CQSPI_REG_CONFIG);
|
|
|
|
if (enable)
|
|
reg |= CQSPI_REG_CONFIG_ENABLE_MASK;
|
|
else
|
|
reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK;
|
|
|
|
writel(reg, reg_base + CQSPI_REG_CONFIG);
|
|
}
|
|
|
|
static void cqspi_configure(struct spi_nor *nor)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
const unsigned int sclk = f_pdata->clk_rate;
|
|
int switch_cs = (cqspi->current_cs != f_pdata->cs);
|
|
int switch_ck = (cqspi->sclk != sclk);
|
|
|
|
if ((cqspi->current_page_size != nor->page_size) ||
|
|
(cqspi->current_erase_size != nor->mtd.erasesize) ||
|
|
(cqspi->current_addr_width != nor->addr_width))
|
|
switch_cs = 1;
|
|
|
|
if (switch_cs || switch_ck)
|
|
cqspi_controller_enable(cqspi, 0);
|
|
|
|
/* Switch chip select. */
|
|
if (switch_cs) {
|
|
cqspi->current_cs = f_pdata->cs;
|
|
cqspi_configure_cs_and_sizes(nor);
|
|
}
|
|
|
|
/* Setup baudrate divisor and delays */
|
|
if (switch_ck) {
|
|
cqspi->sclk = sclk;
|
|
cqspi_config_baudrate_div(cqspi);
|
|
cqspi_delay(nor);
|
|
cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay);
|
|
}
|
|
|
|
if (switch_cs || switch_ck)
|
|
cqspi_controller_enable(cqspi, 1);
|
|
}
|
|
|
|
static int cqspi_set_protocol(struct spi_nor *nor, const int read)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
|
|
f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE;
|
|
f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE;
|
|
f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
|
|
|
|
if (read) {
|
|
switch (nor->flash_read) {
|
|
case SPI_NOR_NORMAL:
|
|
case SPI_NOR_FAST:
|
|
f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
|
|
break;
|
|
case SPI_NOR_DUAL:
|
|
f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
|
|
break;
|
|
case SPI_NOR_QUAD:
|
|
f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
cqspi_configure(nor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
|
|
size_t len, const u_char *buf)
|
|
{
|
|
int ret;
|
|
|
|
ret = cqspi_set_protocol(nor, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = cqspi_indirect_write_setup(nor, to);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = cqspi_indirect_write_execute(nor, buf, len);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t cqspi_read(struct spi_nor *nor, loff_t from,
|
|
size_t len, u_char *buf)
|
|
{
|
|
int ret;
|
|
|
|
ret = cqspi_set_protocol(nor, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = cqspi_indirect_read_setup(nor, from);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = cqspi_indirect_read_execute(nor, buf, len);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int cqspi_erase(struct spi_nor *nor, loff_t offs)
|
|
{
|
|
int ret;
|
|
|
|
ret = cqspi_set_protocol(nor, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Send write enable, then erase commands. */
|
|
ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Set up command buffer. */
|
|
ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
|
|
mutex_lock(&cqspi->bus_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cqspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
|
|
{
|
|
struct cqspi_flash_pdata *f_pdata = nor->priv;
|
|
struct cqspi_st *cqspi = f_pdata->cqspi;
|
|
|
|
mutex_unlock(&cqspi->bus_mutex);
|
|
}
|
|
|
|
static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
|
|
{
|
|
int ret;
|
|
|
|
ret = cqspi_set_protocol(nor, 0);
|
|
if (!ret)
|
|
ret = cqspi_command_read(nor, &opcode, 1, buf, len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
|
|
{
|
|
int ret;
|
|
|
|
ret = cqspi_set_protocol(nor, 0);
|
|
if (!ret)
|
|
ret = cqspi_command_write(nor, opcode, buf, len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
|
|
struct cqspi_flash_pdata *f_pdata,
|
|
struct device_node *np)
|
|
{
|
|
if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) {
|
|
dev_err(&pdev->dev, "couldn't determine read-delay\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) {
|
|
dev_err(&pdev->dev, "couldn't determine tshsl-ns\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) {
|
|
dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) {
|
|
dev_err(&pdev->dev, "couldn't determine tchsh-ns\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) {
|
|
dev_err(&pdev->dev, "couldn't determine tslch-ns\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) {
|
|
dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cqspi_of_get_pdata(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct cqspi_st *cqspi = platform_get_drvdata(pdev);
|
|
|
|
cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs");
|
|
|
|
if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) {
|
|
dev_err(&pdev->dev, "couldn't determine fifo-depth\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) {
|
|
dev_err(&pdev->dev, "couldn't determine fifo-width\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "cdns,trigger-address",
|
|
&cqspi->trigger_address)) {
|
|
dev_err(&pdev->dev, "couldn't determine trigger-address\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cqspi_controller_init(struct cqspi_st *cqspi)
|
|
{
|
|
cqspi_controller_enable(cqspi, 0);
|
|
|
|
/* Configure the remap address register, no remap */
|
|
writel(0, cqspi->iobase + CQSPI_REG_REMAP);
|
|
|
|
/* Disable all interrupts. */
|
|
writel(0, cqspi->iobase + CQSPI_REG_IRQMASK);
|
|
|
|
/* Configure the SRAM split to 1:1 . */
|
|
writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION);
|
|
|
|
/* Load indirect trigger address. */
|
|
writel(cqspi->trigger_address,
|
|
cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER);
|
|
|
|
/* Program read watermark -- 1/2 of the FIFO. */
|
|
writel(cqspi->fifo_depth * cqspi->fifo_width / 2,
|
|
cqspi->iobase + CQSPI_REG_INDIRECTRDWATERMARK);
|
|
/* Program write watermark -- 1/8 of the FIFO. */
|
|
writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
|
|
cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);
|
|
|
|
cqspi_controller_enable(cqspi, 1);
|
|
}
|
|
|
|
static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
|
|
{
|
|
struct platform_device *pdev = cqspi->pdev;
|
|
struct device *dev = &pdev->dev;
|
|
struct cqspi_flash_pdata *f_pdata;
|
|
struct spi_nor *nor;
|
|
struct mtd_info *mtd;
|
|
unsigned int cs;
|
|
int i, ret;
|
|
|
|
/* Get flash device data */
|
|
for_each_available_child_of_node(dev->of_node, np) {
|
|
ret = of_property_read_u32(np, "reg", &cs);
|
|
if (ret) {
|
|
dev_err(dev, "Couldn't determine chip select.\n");
|
|
goto err;
|
|
}
|
|
|
|
if (cs >= CQSPI_MAX_CHIPSELECT) {
|
|
ret = -EINVAL;
|
|
dev_err(dev, "Chip select %d out of range.\n", cs);
|
|
goto err;
|
|
}
|
|
|
|
f_pdata = &cqspi->f_pdata[cs];
|
|
f_pdata->cqspi = cqspi;
|
|
f_pdata->cs = cs;
|
|
|
|
ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np);
|
|
if (ret)
|
|
goto err;
|
|
|
|
nor = &f_pdata->nor;
|
|
mtd = &nor->mtd;
|
|
|
|
mtd->priv = nor;
|
|
|
|
nor->dev = dev;
|
|
spi_nor_set_flash_node(nor, np);
|
|
nor->priv = f_pdata;
|
|
|
|
nor->read_reg = cqspi_read_reg;
|
|
nor->write_reg = cqspi_write_reg;
|
|
nor->read = cqspi_read;
|
|
nor->write = cqspi_write;
|
|
nor->erase = cqspi_erase;
|
|
nor->prepare = cqspi_prep;
|
|
nor->unprepare = cqspi_unprep;
|
|
|
|
mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d",
|
|
dev_name(dev), cs);
|
|
if (!mtd->name) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = mtd_device_register(mtd, NULL, 0);
|
|
if (ret)
|
|
goto err;
|
|
|
|
f_pdata->registered = true;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++)
|
|
if (cqspi->f_pdata[i].registered)
|
|
mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd);
|
|
return ret;
|
|
}
|
|
|
|
static int cqspi_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct device *dev = &pdev->dev;
|
|
struct cqspi_st *cqspi;
|
|
struct resource *res;
|
|
struct resource *res_ahb;
|
|
int ret;
|
|
int irq;
|
|
|
|
cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL);
|
|
if (!cqspi)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&cqspi->bus_mutex);
|
|
cqspi->pdev = pdev;
|
|
platform_set_drvdata(pdev, cqspi);
|
|
|
|
/* Obtain configuration from OF. */
|
|
ret = cqspi_of_get_pdata(pdev);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot get mandatory OF data.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Obtain QSPI clock. */
|
|
cqspi->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(cqspi->clk)) {
|
|
dev_err(dev, "Cannot claim QSPI clock.\n");
|
|
return PTR_ERR(cqspi->clk);
|
|
}
|
|
|
|
/* Obtain and remap controller address. */
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
cqspi->iobase = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(cqspi->iobase)) {
|
|
dev_err(dev, "Cannot remap controller address.\n");
|
|
return PTR_ERR(cqspi->iobase);
|
|
}
|
|
|
|
/* Obtain and remap AHB address. */
|
|
res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb);
|
|
if (IS_ERR(cqspi->ahb_base)) {
|
|
dev_err(dev, "Cannot remap AHB address.\n");
|
|
return PTR_ERR(cqspi->ahb_base);
|
|
}
|
|
|
|
init_completion(&cqspi->transfer_complete);
|
|
|
|
/* Obtain IRQ line. */
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(dev, "Cannot obtain IRQ.\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
ret = clk_prepare_enable(cqspi->clk);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot enable QSPI clock.\n");
|
|
return ret;
|
|
}
|
|
|
|
cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
|
|
|
|
ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
|
|
pdev->name, cqspi);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot request IRQ.\n");
|
|
goto probe_irq_failed;
|
|
}
|
|
|
|
cqspi_wait_idle(cqspi);
|
|
cqspi_controller_init(cqspi);
|
|
cqspi->current_cs = -1;
|
|
cqspi->sclk = 0;
|
|
|
|
ret = cqspi_setup_flash(cqspi, np);
|
|
if (ret) {
|
|
dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret);
|
|
goto probe_setup_failed;
|
|
}
|
|
|
|
return ret;
|
|
probe_irq_failed:
|
|
cqspi_controller_enable(cqspi, 0);
|
|
probe_setup_failed:
|
|
clk_disable_unprepare(cqspi->clk);
|
|
return ret;
|
|
}
|
|
|
|
static int cqspi_remove(struct platform_device *pdev)
|
|
{
|
|
struct cqspi_st *cqspi = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++)
|
|
if (cqspi->f_pdata[i].registered)
|
|
mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd);
|
|
|
|
cqspi_controller_enable(cqspi, 0);
|
|
|
|
clk_disable_unprepare(cqspi->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int cqspi_suspend(struct device *dev)
|
|
{
|
|
struct cqspi_st *cqspi = dev_get_drvdata(dev);
|
|
|
|
cqspi_controller_enable(cqspi, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int cqspi_resume(struct device *dev)
|
|
{
|
|
struct cqspi_st *cqspi = dev_get_drvdata(dev);
|
|
|
|
cqspi_controller_enable(cqspi, 1);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops cqspi__dev_pm_ops = {
|
|
.suspend = cqspi_suspend,
|
|
.resume = cqspi_resume,
|
|
};
|
|
|
|
#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops)
|
|
#else
|
|
#define CQSPI_DEV_PM_OPS NULL
|
|
#endif
|
|
|
|
static struct of_device_id const cqspi_dt_ids[] = {
|
|
{.compatible = "cdns,qspi-nor",},
|
|
{ /* end of table */ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, cqspi_dt_ids);
|
|
|
|
static struct platform_driver cqspi_platform_driver = {
|
|
.probe = cqspi_probe,
|
|
.remove = cqspi_remove,
|
|
.driver = {
|
|
.name = CQSPI_NAME,
|
|
.pm = CQSPI_DEV_PM_OPS,
|
|
.of_match_table = cqspi_dt_ids,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(cqspi_platform_driver);
|
|
|
|
MODULE_DESCRIPTION("Cadence QSPI Controller Driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" CQSPI_NAME);
|
|
MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
|
|
MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>");
|