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u-boot/drivers/spi/cadence_qspi_apb.c
Pratyush Yadav 38b0852b0e spi: cadence-qspi: Add support for octal DTR flashes 
Set up opcode extension and enable/disable DTR mode based on whether the
command is DTR or not.

xSPI flashes can have a 4-byte dummy address associated with some
commands like the Read Status Register command in octal DTR mode. Since
the flash does not support sending the dummy address, we can not use
automatic write completion polling in DTR mode. Further, no write
completion polling makes it impossible to use DAC mode for DTR writes.
In that mode, the controller does not know beforehand how long a write
will be and so it can de-assert Chip Select (CS#) at any time. Once CS#
is de-assert, the flash will go into burning phase. But since the
controller does not do write completion polling, it does not know when
the flash is busy and might send in writes while the flash is not ready.

So, disable write completion polling and make writes go through indirect
mode for DTR writes and let spi-mem take care of polling the SR.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
2021-06-28 11:57:23 +05:30

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/*
* Copyright (C) 2012 Altera Corporation <www.altera.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of the Altera Corporation nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL ALTERA CORPORATION BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <common.h>
#include <log.h>
#include <asm/io.h>
#include <dma.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <wait_bit.h>
#include <spi.h>
#include <spi-mem.h>
#include <malloc.h>
#include "cadence_qspi.h"
#define CQSPI_REG_POLL_US 1 /* 1us */
#define CQSPI_REG_RETRY 10000
#define CQSPI_POLL_IDLE_RETRY 3
/* Transfer mode */
#define CQSPI_INST_TYPE_SINGLE 0
#define CQSPI_INST_TYPE_DUAL 1
#define CQSPI_INST_TYPE_QUAD 2
#define CQSPI_INST_TYPE_OCTAL 3
#define CQSPI_STIG_DATA_LEN_MAX 8
#define CQSPI_DUMMY_CLKS_PER_BYTE 8
#define CQSPI_DUMMY_CLKS_MAX 31
/****************************************************************************
* Controller's configuration and status register (offset from QSPI_BASE)
****************************************************************************/
#define CQSPI_REG_CONFIG 0x00
#define CQSPI_REG_CONFIG_ENABLE BIT(0)
#define CQSPI_REG_CONFIG_CLK_POL BIT(1)
#define CQSPI_REG_CONFIG_CLK_PHA BIT(2)
#define CQSPI_REG_CONFIG_DIRECT BIT(7)
#define CQSPI_REG_CONFIG_DECODE BIT(9)
#define CQSPI_REG_CONFIG_XIP_IMM BIT(18)
#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
#define CQSPI_REG_CONFIG_BAUD_LSB 19
#define CQSPI_REG_CONFIG_DTR_PROTO BIT(24)
#define CQSPI_REG_CONFIG_DUAL_OPCODE BIT(30)
#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_RD_DATA_CAPTURE 0x10
#define CQSPI_REG_RD_DATA_CAPTURE_BYPASS BIT(0)
#define CQSPI_REG_RD_DATA_CAPTURE_DELAY_LSB 1
#define CQSPI_REG_RD_DATA_CAPTURE_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_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_WR_COMPLETION_CTRL 0x38
#define CQSPI_REG_WR_DISABLE_AUTO_POLL BIT(14)
#define CQSPI_REG_IRQSTATUS 0x40
#define CQSPI_REG_IRQMASK 0x44
#define CQSPI_REG_INDIRECTRD 0x60
#define CQSPI_REG_INDIRECTRD_START BIT(0)
#define CQSPI_REG_INDIRECTRD_CANCEL BIT(1)
#define CQSPI_REG_INDIRECTRD_INPROGRESS BIT(2)
#define CQSPI_REG_INDIRECTRD_DONE 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 BIT(0)
#define CQSPI_REG_CMDCTRL_INPROGRESS BIT(1)
#define CQSPI_REG_CMDCTRL_DUMMY_LSB 7
#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_DUMMY_MASK 0x1F
#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_CMDCTRL_OPCODE_MASK 0xFF
#define CQSPI_REG_INDIRECTWR 0x70
#define CQSPI_REG_INDIRECTWR_START BIT(0)
#define CQSPI_REG_INDIRECTWR_CANCEL BIT(1)
#define CQSPI_REG_INDIRECTWR_INPROGRESS BIT(2)
#define CQSPI_REG_INDIRECTWR_DONE 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
#define CQSPI_REG_OP_EXT_LOWER 0xE0
#define CQSPI_REG_OP_EXT_READ_LSB 24
#define CQSPI_REG_OP_EXT_WRITE_LSB 16
#define CQSPI_REG_OP_EXT_STIG_LSB 0
#define CQSPI_REG_IS_IDLE(base) \
((readl(base + CQSPI_REG_CONFIG) >> \
CQSPI_REG_CONFIG_IDLE_LSB) & 0x1)
#define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \
(((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \
CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK)
#define CQSPI_GET_WR_SRAM_LEVEL(reg_base) \
(((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \
CQSPI_REG_SDRAMLEVEL_WR_LSB) & CQSPI_REG_SDRAMLEVEL_WR_MASK)
void cadence_qspi_apb_controller_enable(void *reg_base)
{
unsigned int reg;
reg = readl(reg_base + CQSPI_REG_CONFIG);
reg |= CQSPI_REG_CONFIG_ENABLE;
writel(reg, reg_base + CQSPI_REG_CONFIG);
}
void cadence_qspi_apb_controller_disable(void *reg_base)
{
unsigned int reg;
reg = readl(reg_base + CQSPI_REG_CONFIG);
reg &= ~CQSPI_REG_CONFIG_ENABLE;
writel(reg, reg_base + CQSPI_REG_CONFIG);
}
void cadence_qspi_apb_dac_mode_enable(void *reg_base)
{
unsigned int reg;
reg = readl(reg_base + CQSPI_REG_CONFIG);
reg |= CQSPI_REG_CONFIG_DIRECT;
writel(reg, reg_base + CQSPI_REG_CONFIG);
}
static unsigned int cadence_qspi_calc_dummy(const struct spi_mem_op *op,
bool dtr)
{
unsigned int dummy_clk;
dummy_clk = op->dummy.nbytes * (8 / op->dummy.buswidth);
if (dtr)
dummy_clk /= 2;
return dummy_clk;
}
static u32 cadence_qspi_calc_rdreg(struct cadence_spi_plat *plat)
{
u32 rdreg = 0;
rdreg |= plat->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB;
rdreg |= plat->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB;
rdreg |= plat->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
return rdreg;
}
static int cadence_qspi_buswidth_to_inst_type(u8 buswidth)
{
switch (buswidth) {
case 0:
case 1:
return CQSPI_INST_TYPE_SINGLE;
case 2:
return CQSPI_INST_TYPE_DUAL;
case 4:
return CQSPI_INST_TYPE_QUAD;
case 8:
return CQSPI_INST_TYPE_OCTAL;
default:
return -ENOTSUPP;
}
}
static int cadence_qspi_set_protocol(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
int ret;
plat->dtr = op->data.dtr && op->cmd.dtr && op->addr.dtr;
ret = cadence_qspi_buswidth_to_inst_type(op->cmd.buswidth);
if (ret < 0)
return ret;
plat->inst_width = ret;
ret = cadence_qspi_buswidth_to_inst_type(op->addr.buswidth);
if (ret < 0)
return ret;
plat->addr_width = ret;
ret = cadence_qspi_buswidth_to_inst_type(op->data.buswidth);
if (ret < 0)
return ret;
plat->data_width = ret;
return 0;
}
/* Return 1 if idle, otherwise return 0 (busy). */
static unsigned int cadence_qspi_wait_idle(void *reg_base)
{
unsigned int start, count = 0;
/* timeout in unit of ms */
unsigned int timeout = 5000;
start = get_timer(0);
for ( ; get_timer(start) < timeout ; ) {
if (CQSPI_REG_IS_IDLE(reg_base))
count++;
else
count = 0;
/*
* Ensure the QSPI controller is in true idle state after
* reading back the same idle status consecutively
*/
if (count >= CQSPI_POLL_IDLE_RETRY)
return 1;
}
/* Timeout, still in busy mode. */
printf("QSPI: QSPI is still busy after poll for %d times.\n",
CQSPI_REG_RETRY);
return 0;
}
void cadence_qspi_apb_readdata_capture(void *reg_base,
unsigned int bypass, unsigned int delay)
{
unsigned int reg;
cadence_qspi_apb_controller_disable(reg_base);
reg = readl(reg_base + CQSPI_REG_RD_DATA_CAPTURE);
if (bypass)
reg |= CQSPI_REG_RD_DATA_CAPTURE_BYPASS;
else
reg &= ~CQSPI_REG_RD_DATA_CAPTURE_BYPASS;
reg &= ~(CQSPI_REG_RD_DATA_CAPTURE_DELAY_MASK
<< CQSPI_REG_RD_DATA_CAPTURE_DELAY_LSB);
reg |= (delay & CQSPI_REG_RD_DATA_CAPTURE_DELAY_MASK)
<< CQSPI_REG_RD_DATA_CAPTURE_DELAY_LSB;
writel(reg, reg_base + CQSPI_REG_RD_DATA_CAPTURE);
cadence_qspi_apb_controller_enable(reg_base);
}
void cadence_qspi_apb_config_baudrate_div(void *reg_base,
unsigned int ref_clk_hz, unsigned int sclk_hz)
{
unsigned int reg;
unsigned int div;
cadence_qspi_apb_controller_disable(reg_base);
reg = readl(reg_base + CQSPI_REG_CONFIG);
reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
/*
* The baud_div field in the config reg is 4 bits, and the ref clock is
* divided by 2 * (baud_div + 1). Round up the divider to ensure the
* SPI clock rate is less than or equal to the requested clock rate.
*/
div = DIV_ROUND_UP(ref_clk_hz, sclk_hz * 2) - 1;
/* ensure the baud rate doesn't exceed the max value */
if (div > CQSPI_REG_CONFIG_BAUD_MASK)
div = CQSPI_REG_CONFIG_BAUD_MASK;
debug("%s: ref_clk %dHz sclk %dHz Div 0x%x, actual %dHz\n", __func__,
ref_clk_hz, sclk_hz, div, ref_clk_hz / (2 * (div + 1)));
reg |= (div << CQSPI_REG_CONFIG_BAUD_LSB);
writel(reg, reg_base + CQSPI_REG_CONFIG);
cadence_qspi_apb_controller_enable(reg_base);
}
void cadence_qspi_apb_set_clk_mode(void *reg_base, uint mode)
{
unsigned int reg;
cadence_qspi_apb_controller_disable(reg_base);
reg = readl(reg_base + CQSPI_REG_CONFIG);
reg &= ~(CQSPI_REG_CONFIG_CLK_POL | CQSPI_REG_CONFIG_CLK_PHA);
if (mode & SPI_CPOL)
reg |= CQSPI_REG_CONFIG_CLK_POL;
if (mode & SPI_CPHA)
reg |= CQSPI_REG_CONFIG_CLK_PHA;
writel(reg, reg_base + CQSPI_REG_CONFIG);
cadence_qspi_apb_controller_enable(reg_base);
}
void cadence_qspi_apb_chipselect(void *reg_base,
unsigned int chip_select, unsigned int decoder_enable)
{
unsigned int reg;
cadence_qspi_apb_controller_disable(reg_base);
debug("%s : chipselect %d decode %d\n", __func__, chip_select,
decoder_enable);
reg = readl(reg_base + CQSPI_REG_CONFIG);
/* docoder */
if (decoder_enable) {
reg |= CQSPI_REG_CONFIG_DECODE;
} else {
reg &= ~CQSPI_REG_CONFIG_DECODE;
/* 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);
cadence_qspi_apb_controller_enable(reg_base);
}
void cadence_qspi_apb_delay(void *reg_base,
unsigned int ref_clk, unsigned int sclk_hz,
unsigned int tshsl_ns, unsigned int tsd2d_ns,
unsigned int tchsh_ns, unsigned int tslch_ns)
{
unsigned int ref_clk_ns;
unsigned int sclk_ns;
unsigned int tshsl, tchsh, tslch, tsd2d;
unsigned int reg;
cadence_qspi_apb_controller_disable(reg_base);
/* Convert to ns. */
ref_clk_ns = DIV_ROUND_UP(1000000000, ref_clk);
/* Convert to ns. */
sclk_ns = DIV_ROUND_UP(1000000000, sclk_hz);
/* The controller adds additional delay to that programmed in the reg */
if (tshsl_ns >= sclk_ns + ref_clk_ns)
tshsl_ns -= sclk_ns + ref_clk_ns;
if (tchsh_ns >= sclk_ns + 3 * ref_clk_ns)
tchsh_ns -= sclk_ns + 3 * ref_clk_ns;
tshsl = DIV_ROUND_UP(tshsl_ns, ref_clk_ns);
tchsh = DIV_ROUND_UP(tchsh_ns, ref_clk_ns);
tslch = DIV_ROUND_UP(tslch_ns, ref_clk_ns);
tsd2d = DIV_ROUND_UP(tsd2d_ns, ref_clk_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, reg_base + CQSPI_REG_DELAY);
cadence_qspi_apb_controller_enable(reg_base);
}
void cadence_qspi_apb_controller_init(struct cadence_spi_plat *plat)
{
unsigned reg;
cadence_qspi_apb_controller_disable(plat->regbase);
/* Configure the device size and address bytes */
reg = readl(plat->regbase + CQSPI_REG_SIZE);
/* Clear the previous value */
reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
reg |= (plat->page_size << CQSPI_REG_SIZE_PAGE_LSB);
reg |= (plat->block_size << CQSPI_REG_SIZE_BLOCK_LSB);
writel(reg, plat->regbase + CQSPI_REG_SIZE);
/* Configure the remap address register, no remap */
writel(0, plat->regbase + CQSPI_REG_REMAP);
/* Indirect mode configurations */
writel(plat->fifo_depth / 2, plat->regbase + CQSPI_REG_SRAMPARTITION);
/* Disable all interrupts */
writel(0, plat->regbase + CQSPI_REG_IRQMASK);
cadence_qspi_apb_controller_enable(plat->regbase);
}
static int cadence_qspi_apb_exec_flash_cmd(void *reg_base,
unsigned int reg)
{
unsigned int retry = CQSPI_REG_RETRY;
/* Write the CMDCTRL without start execution. */
writel(reg, reg_base + CQSPI_REG_CMDCTRL);
/* Start execute */
reg |= CQSPI_REG_CMDCTRL_EXECUTE;
writel(reg, reg_base + CQSPI_REG_CMDCTRL);
while (retry--) {
reg = readl(reg_base + CQSPI_REG_CMDCTRL);
if ((reg & CQSPI_REG_CMDCTRL_INPROGRESS) == 0)
break;
udelay(1);
}
if (!retry) {
printf("QSPI: flash command execution timeout\n");
return -EIO;
}
/* Polling QSPI idle status. */
if (!cadence_qspi_wait_idle(reg_base))
return -EIO;
return 0;
}
static int cadence_qspi_setup_opcode_ext(struct cadence_spi_plat *plat,
const struct spi_mem_op *op,
unsigned int shift)
{
unsigned int reg;
u8 ext;
if (op->cmd.nbytes != 2)
return -EINVAL;
/* Opcode extension is the LSB. */
ext = op->cmd.opcode & 0xff;
reg = readl(plat->regbase + CQSPI_REG_OP_EXT_LOWER);
reg &= ~(0xff << shift);
reg |= ext << shift;
writel(reg, plat->regbase + CQSPI_REG_OP_EXT_LOWER);
return 0;
}
static int cadence_qspi_enable_dtr(struct cadence_spi_plat *plat,
const struct spi_mem_op *op,
unsigned int shift,
bool enable)
{
unsigned int reg;
int ret;
reg = readl(plat->regbase + CQSPI_REG_CONFIG);
if (enable) {
reg |= CQSPI_REG_CONFIG_DTR_PROTO;
reg |= CQSPI_REG_CONFIG_DUAL_OPCODE;
/* Set up command opcode extension. */
ret = cadence_qspi_setup_opcode_ext(plat, op, shift);
if (ret)
return ret;
} else {
reg &= ~CQSPI_REG_CONFIG_DTR_PROTO;
reg &= ~CQSPI_REG_CONFIG_DUAL_OPCODE;
}
writel(reg, plat->regbase + CQSPI_REG_CONFIG);
return 0;
}
int cadence_qspi_apb_command_read_setup(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
int ret;
unsigned int reg;
ret = cadence_qspi_set_protocol(plat, op);
if (ret)
return ret;
ret = cadence_qspi_enable_dtr(plat, op, CQSPI_REG_OP_EXT_STIG_LSB,
plat->dtr);
if (ret)
return ret;
reg = cadence_qspi_calc_rdreg(plat);
writel(reg, plat->regbase + CQSPI_REG_RD_INSTR);
return 0;
}
/* For command RDID, RDSR. */
int cadence_qspi_apb_command_read(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
void *reg_base = plat->regbase;
unsigned int reg;
unsigned int read_len;
int status;
unsigned int rxlen = op->data.nbytes;
void *rxbuf = op->data.buf.in;
unsigned int dummy_clk;
u8 opcode;
if (rxlen > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
printf("QSPI: Invalid input arguments rxlen %u\n", rxlen);
return -EINVAL;
}
if (plat->dtr)
opcode = op->cmd.opcode >> 8;
else
opcode = op->cmd.opcode;
reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
/* Set up dummy cycles. */
dummy_clk = cadence_qspi_calc_dummy(op, plat->dtr);
if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
return -ENOTSUPP;
if (dummy_clk)
reg |= (dummy_clk & CQSPI_REG_CMDCTRL_DUMMY_MASK)
<< CQSPI_REG_CMDCTRL_DUMMY_LSB;
reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
/* 0 means 1 byte. */
reg |= (((rxlen - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
<< CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
status = cadence_qspi_apb_exec_flash_cmd(reg_base, reg);
if (status != 0)
return status;
reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
/* Put the read value into rx_buf */
read_len = (rxlen > 4) ? 4 : rxlen;
memcpy(rxbuf, &reg, read_len);
rxbuf += read_len;
if (rxlen > 4) {
reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
read_len = rxlen - read_len;
memcpy(rxbuf, &reg, read_len);
}
return 0;
}
int cadence_qspi_apb_command_write_setup(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
int ret;
unsigned int reg;
ret = cadence_qspi_set_protocol(plat, op);
if (ret)
return ret;
ret = cadence_qspi_enable_dtr(plat, op, CQSPI_REG_OP_EXT_STIG_LSB,
plat->dtr);
if (ret)
return ret;
reg = cadence_qspi_calc_rdreg(plat);
writel(reg, plat->regbase + CQSPI_REG_RD_INSTR);
return 0;
}
/* For commands: WRSR, WREN, WRDI, CHIP_ERASE, BE, etc. */
int cadence_qspi_apb_command_write(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
unsigned int reg = 0;
unsigned int wr_data;
unsigned int wr_len;
unsigned int txlen = op->data.nbytes;
const void *txbuf = op->data.buf.out;
void *reg_base = plat->regbase;
u32 addr;
u8 opcode;
/* Reorder address to SPI bus order if only transferring address */
if (!txlen) {
addr = cpu_to_be32(op->addr.val);
if (op->addr.nbytes == 3)
addr >>= 8;
txbuf = &addr;
txlen = op->addr.nbytes;
}
if (txlen > CQSPI_STIG_DATA_LEN_MAX) {
printf("QSPI: Invalid input arguments txlen %u\n", txlen);
return -EINVAL;
}
if (plat->dtr)
opcode = op->cmd.opcode >> 8;
else
opcode = op->cmd.opcode;
reg |= opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
if (txlen) {
/* writing data = yes */
reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
reg |= ((txlen - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
<< CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
wr_len = txlen > 4 ? 4 : txlen;
memcpy(&wr_data, txbuf, wr_len);
writel(wr_data, reg_base +
CQSPI_REG_CMDWRITEDATALOWER);
if (txlen > 4) {
txbuf += wr_len;
wr_len = txlen - wr_len;
memcpy(&wr_data, txbuf, wr_len);
writel(wr_data, reg_base +
CQSPI_REG_CMDWRITEDATAUPPER);
}
}
/* Execute the command */
return cadence_qspi_apb_exec_flash_cmd(reg_base, reg);
}
/* Opcode + Address (3/4 bytes) + dummy bytes (0-4 bytes) */
int cadence_qspi_apb_read_setup(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
unsigned int reg;
unsigned int rd_reg;
unsigned int dummy_clk;
unsigned int dummy_bytes = op->dummy.nbytes;
int ret;
u8 opcode;
ret = cadence_qspi_set_protocol(plat, op);
if (ret)
return ret;
ret = cadence_qspi_enable_dtr(plat, op, CQSPI_REG_OP_EXT_READ_LSB,
plat->dtr);
if (ret)
return ret;
/* Setup the indirect trigger address */
writel(plat->trigger_address,
plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
/* Configure the opcode */
if (plat->dtr)
opcode = op->cmd.opcode >> 8;
else
opcode = op->cmd.opcode;
rd_reg = opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
rd_reg |= cadence_qspi_calc_rdreg(plat);
writel(op->addr.val, plat->regbase + CQSPI_REG_INDIRECTRDSTARTADDR);
if (dummy_bytes) {
/* Convert to clock cycles. */
dummy_clk = cadence_qspi_calc_dummy(op, plat->dtr);
if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
return -ENOTSUPP;
if (dummy_clk)
rd_reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
<< CQSPI_REG_RD_INSTR_DUMMY_LSB;
}
writel(rd_reg, plat->regbase + CQSPI_REG_RD_INSTR);
/* set device size */
reg = readl(plat->regbase + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
reg |= (op->addr.nbytes - 1);
writel(reg, plat->regbase + CQSPI_REG_SIZE);
return 0;
}
static u32 cadence_qspi_get_rd_sram_level(struct cadence_spi_plat *plat)
{
u32 reg = readl(plat->regbase + CQSPI_REG_SDRAMLEVEL);
reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB;
return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
}
static int cadence_qspi_wait_for_data(struct cadence_spi_plat *plat)
{
unsigned int timeout = 10000;
u32 reg;
while (timeout--) {
reg = cadence_qspi_get_rd_sram_level(plat);
if (reg)
return reg;
udelay(1);
}
return -ETIMEDOUT;
}
static int
cadence_qspi_apb_indirect_read_execute(struct cadence_spi_plat *plat,
unsigned int n_rx, u8 *rxbuf)
{
unsigned int remaining = n_rx;
unsigned int bytes_to_read = 0;
int ret;
writel(n_rx, plat->regbase + CQSPI_REG_INDIRECTRDBYTES);
/* Start the indirect read transfer */
writel(CQSPI_REG_INDIRECTRD_START,
plat->regbase + CQSPI_REG_INDIRECTRD);
while (remaining > 0) {
ret = cadence_qspi_wait_for_data(plat);
if (ret < 0) {
printf("Indirect write timed out (%i)\n", ret);
goto failrd;
}
bytes_to_read = ret;
while (bytes_to_read != 0) {
bytes_to_read *= plat->fifo_width;
bytes_to_read = bytes_to_read > remaining ?
remaining : bytes_to_read;
/*
* Handle non-4-byte aligned access to avoid
* data abort.
*/
if (((uintptr_t)rxbuf % 4) || (bytes_to_read % 4))
readsb(plat->ahbbase, rxbuf, bytes_to_read);
else
readsl(plat->ahbbase, rxbuf,
bytes_to_read >> 2);
rxbuf += bytes_to_read;
remaining -= bytes_to_read;
bytes_to_read = cadence_qspi_get_rd_sram_level(plat);
}
}
/* Check indirect done status */
ret = wait_for_bit_le32(plat->regbase + CQSPI_REG_INDIRECTRD,
CQSPI_REG_INDIRECTRD_DONE, 1, 10, 0);
if (ret) {
printf("Indirect read completion error (%i)\n", ret);
goto failrd;
}
/* Clear indirect completion status */
writel(CQSPI_REG_INDIRECTRD_DONE,
plat->regbase + CQSPI_REG_INDIRECTRD);
return 0;
failrd:
/* Cancel the indirect read */
writel(CQSPI_REG_INDIRECTRD_CANCEL,
plat->regbase + CQSPI_REG_INDIRECTRD);
return ret;
}
int cadence_qspi_apb_read_execute(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
u64 from = op->addr.val;
void *buf = op->data.buf.in;
size_t len = op->data.nbytes;
if (plat->use_dac_mode && (from + len < plat->ahbsize)) {
if (len < 256 ||
dma_memcpy(buf, plat->ahbbase + from, len) < 0) {
memcpy_fromio(buf, plat->ahbbase + from, len);
}
if (!cadence_qspi_wait_idle(plat->regbase))
return -EIO;
return 0;
}
return cadence_qspi_apb_indirect_read_execute(plat, len, buf);
}
/* Opcode + Address (3/4 bytes) */
int cadence_qspi_apb_write_setup(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
unsigned int reg;
int ret;
u8 opcode;
ret = cadence_qspi_set_protocol(plat, op);
if (ret)
return ret;
ret = cadence_qspi_enable_dtr(plat, op, CQSPI_REG_OP_EXT_WRITE_LSB,
plat->dtr);
if (ret)
return ret;
/* Setup the indirect trigger address */
writel(plat->trigger_address,
plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
/* Configure the opcode */
if (plat->dtr)
opcode = op->cmd.opcode >> 8;
else
opcode = op->cmd.opcode;
reg = opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
reg |= plat->data_width << CQSPI_REG_WR_INSTR_TYPE_DATA_LSB;
reg |= plat->addr_width << CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB;
writel(reg, plat->regbase + CQSPI_REG_WR_INSTR);
reg = cadence_qspi_calc_rdreg(plat);
writel(reg, plat->regbase + CQSPI_REG_RD_INSTR);
writel(op->addr.val, plat->regbase + CQSPI_REG_INDIRECTWRSTARTADDR);
if (plat->dtr) {
/*
* Some flashes like the cypress Semper flash expect a 4-byte
* dummy address with the Read SR command in DTR mode, but this
* controller does not support sending address with the Read SR
* command. So, disable write completion polling on the
* controller's side. spi-nor will take care of polling the
* status register.
*/
reg = readl(plat->regbase + CQSPI_REG_WR_COMPLETION_CTRL);
reg |= CQSPI_REG_WR_DISABLE_AUTO_POLL;
writel(reg, plat->regbase + CQSPI_REG_WR_COMPLETION_CTRL);
}
reg = readl(plat->regbase + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
reg |= (op->addr.nbytes - 1);
writel(reg, plat->regbase + CQSPI_REG_SIZE);
return 0;
}
static int
cadence_qspi_apb_indirect_write_execute(struct cadence_spi_plat *plat,
unsigned int n_tx, const u8 *txbuf)
{
unsigned int page_size = plat->page_size;
unsigned int remaining = n_tx;
const u8 *bb_txbuf = txbuf;
void *bounce_buf = NULL;
unsigned int write_bytes;
int ret;
/*
* Use bounce buffer for non 32 bit aligned txbuf to avoid data
* aborts
*/
if ((uintptr_t)txbuf % 4) {
bounce_buf = malloc(n_tx);
if (!bounce_buf)
return -ENOMEM;
memcpy(bounce_buf, txbuf, n_tx);
bb_txbuf = bounce_buf;
}
/* Configure the indirect read transfer bytes */
writel(n_tx, plat->regbase + CQSPI_REG_INDIRECTWRBYTES);
/* Start the indirect write transfer */
writel(CQSPI_REG_INDIRECTWR_START,
plat->regbase + CQSPI_REG_INDIRECTWR);
/*
* Some delay is required for the above bit to be internally
* synchronized by the QSPI module.
*/
ndelay(plat->wr_delay);
while (remaining > 0) {
write_bytes = remaining > page_size ? page_size : remaining;
writesl(plat->ahbbase, bb_txbuf, write_bytes >> 2);
if (write_bytes % 4)
writesb(plat->ahbbase,
bb_txbuf + rounddown(write_bytes, 4),
write_bytes % 4);
ret = wait_for_bit_le32(plat->regbase + CQSPI_REG_SDRAMLEVEL,
CQSPI_REG_SDRAMLEVEL_WR_MASK <<
CQSPI_REG_SDRAMLEVEL_WR_LSB, 0, 10, 0);
if (ret) {
printf("Indirect write timed out (%i)\n", ret);
goto failwr;
}
bb_txbuf += write_bytes;
remaining -= write_bytes;
}
/* Check indirect done status */
ret = wait_for_bit_le32(plat->regbase + CQSPI_REG_INDIRECTWR,
CQSPI_REG_INDIRECTWR_DONE, 1, 10, 0);
if (ret) {
printf("Indirect write completion error (%i)\n", ret);
goto failwr;
}
/* Clear indirect completion status */
writel(CQSPI_REG_INDIRECTWR_DONE,
plat->regbase + CQSPI_REG_INDIRECTWR);
if (bounce_buf)
free(bounce_buf);
return 0;
failwr:
/* Cancel the indirect write */
writel(CQSPI_REG_INDIRECTWR_CANCEL,
plat->regbase + CQSPI_REG_INDIRECTWR);
if (bounce_buf)
free(bounce_buf);
return ret;
}
int cadence_qspi_apb_write_execute(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
u32 to = op->addr.val;
const void *buf = op->data.buf.out;
size_t len = op->data.nbytes;
/*
* Some flashes like the Cypress Semper flash expect a dummy 4-byte
* address (all 0s) with the read status register command in DTR mode.
* But this controller does not support sending dummy address bytes to
* the flash when it is polling the write completion register in DTR
* mode. So, we can not use direct mode when in DTR mode for writing
* data.
*/
if (!plat->dtr && plat->use_dac_mode && (to + len < plat->ahbsize)) {
memcpy_toio(plat->ahbbase + to, buf, len);
if (!cadence_qspi_wait_idle(plat->regbase))
return -EIO;
return 0;
}
return cadence_qspi_apb_indirect_write_execute(plat, len, buf);
}
void cadence_qspi_apb_enter_xip(void *reg_base, char xip_dummy)
{
unsigned int reg;
/* enter XiP mode immediately and enable direct mode */
reg = readl(reg_base + CQSPI_REG_CONFIG);
reg |= CQSPI_REG_CONFIG_ENABLE;
reg |= CQSPI_REG_CONFIG_DIRECT;
reg |= CQSPI_REG_CONFIG_XIP_IMM;
writel(reg, reg_base + CQSPI_REG_CONFIG);
/* keep the XiP mode */
writel(xip_dummy, reg_base + CQSPI_REG_MODE_BIT);
/* Enable mode bit at devrd */
reg = readl(reg_base + CQSPI_REG_RD_INSTR);
reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
writel(reg, reg_base + CQSPI_REG_RD_INSTR);
}
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