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u-boot/drivers/spi/cadence_qspi_apb.c
Phil Edworthy 22e63ff3a2 spi: cadence_qspi: Fix CS timings 
The Cadence QSPI controller has specified overheads for the various CS
times that are in addition to those programmed in to the Device Delay
register. The overheads are different for the delays.

In addition, the existing code does not handle the case when the delay
is less than a SCLK period.

This change accurately calculates the additional delays in Ref clocks.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
2016-12-15 16:57:27 +01:00

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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 <asm/io.h>
#include <linux/errno.h>
#include <wait_bit.h>
#include <spi.h>
#include "cadence_qspi.h"
#define CQSPI_REG_POLL_US 1 /* 1us */
#define CQSPI_REG_RETRY 10000
#define CQSPI_POLL_IDLE_RETRY 3
#define CQSPI_FIFO_WIDTH 4
#define CQSPI_REG_SRAM_THRESHOLD_WORDS 50
/* Transfer mode */
#define CQSPI_INST_TYPE_SINGLE 0
#define CQSPI_INST_TYPE_DUAL 1
#define CQSPI_INST_TYPE_QUAD 2
#define CQSPI_STIG_DATA_LEN_MAX 8
#define CQSPI_DUMMY_CLKS_PER_BYTE 8
#define CQSPI_DUMMY_BYTES_MAX 4
#define CQSPI_REG_SRAM_FILL_THRESHOLD \
((CQSPI_REG_SRAM_SIZE_WORD / 2) * CQSPI_FIFO_WIDTH)
/****************************************************************************
* 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_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_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_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_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)
static unsigned int cadence_qspi_apb_cmd2addr(const unsigned char *addr_buf,
unsigned int addr_width)
{
unsigned int addr;
addr = (addr_buf[0] << 16) | (addr_buf[1] << 8) | addr_buf[2];
if (addr_width == 4)
addr = (addr << 8) | addr_buf[3];
return addr;
}
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);
}
/* 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_platdata *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->sram_size/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;
}
/* For command RDID, RDSR. */
int cadence_qspi_apb_command_read(void *reg_base,
unsigned int cmdlen, const u8 *cmdbuf, unsigned int rxlen,
u8 *rxbuf)
{
unsigned int reg;
unsigned int read_len;
int status;
if (!cmdlen || rxlen > CQSPI_STIG_DATA_LEN_MAX || rxbuf == NULL) {
printf("QSPI: Invalid input arguments cmdlen %d rxlen %d\n",
cmdlen, rxlen);
return -EINVAL;
}
reg = cmdbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_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;
}
/* For commands: WRSR, WREN, WRDI, CHIP_ERASE, BE, etc. */
int cadence_qspi_apb_command_write(void *reg_base, unsigned int cmdlen,
const u8 *cmdbuf, unsigned int txlen, const u8 *txbuf)
{
unsigned int reg = 0;
unsigned int addr_value;
unsigned int wr_data;
unsigned int wr_len;
if (!cmdlen || cmdlen > 5 || txlen > 8 || cmdbuf == NULL) {
printf("QSPI: Invalid input arguments cmdlen %d txlen %d\n",
cmdlen, txlen);
return -EINVAL;
}
reg |= cmdbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
if (cmdlen == 4 || cmdlen == 5) {
/* Command with address */
reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
/* Number of bytes to write. */
reg |= ((cmdlen - 2) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
<< CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
/* Get address */
addr_value = cadence_qspi_apb_cmd2addr(&cmdbuf[1],
cmdlen >= 5 ? 4 : 3);
writel(addr_value, reg_base + CQSPI_REG_CMDADDRESS);
}
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_indirect_read_setup(struct cadence_spi_platdata *plat,
unsigned int cmdlen, unsigned int rx_width, const u8 *cmdbuf)
{
unsigned int reg;
unsigned int rd_reg;
unsigned int addr_value;
unsigned int dummy_clk;
unsigned int dummy_bytes;
unsigned int addr_bytes;
/*
* Identify addr_byte. All NOR flash device drivers are using fast read
* which always expecting 1 dummy byte, 1 cmd byte and 3/4 addr byte.
* With that, the length is in value of 5 or 6. Only FRAM chip from
* ramtron using normal read (which won't need dummy byte).
* Unlikely NOR flash using normal read due to performance issue.
*/
if (cmdlen >= 5)
/* to cater fast read where cmd + addr + dummy */
addr_bytes = cmdlen - 2;
else
/* for normal read (only ramtron as of now) */
addr_bytes = cmdlen - 1;
/* Setup the indirect trigger address */
writel((u32)plat->ahbbase,
plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
/* Configure the opcode */
rd_reg = cmdbuf[0] << CQSPI_REG_RD_INSTR_OPCODE_LSB;
if (rx_width & SPI_RX_QUAD)
/* Instruction and address at DQ0, data at DQ0-3. */
rd_reg |= CQSPI_INST_TYPE_QUAD << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
/* Get address */
addr_value = cadence_qspi_apb_cmd2addr(&cmdbuf[1], addr_bytes);
writel(addr_value, plat->regbase + CQSPI_REG_INDIRECTRDSTARTADDR);
/* The remaining lenght is dummy bytes. */
dummy_bytes = cmdlen - addr_bytes - 1;
if (dummy_bytes) {
if (dummy_bytes > CQSPI_DUMMY_BYTES_MAX)
dummy_bytes = CQSPI_DUMMY_BYTES_MAX;
rd_reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
#if defined(CONFIG_SPL_SPI_XIP) && defined(CONFIG_SPL_BUILD)
writel(0x0, plat->regbase + CQSPI_REG_MODE_BIT);
#else
writel(0xFF, plat->regbase + CQSPI_REG_MODE_BIT);
#endif
/* Convert to clock cycles. */
dummy_clk = dummy_bytes * CQSPI_DUMMY_CLKS_PER_BYTE;
/* Need to minus the mode byte (8 clocks). */
dummy_clk -= CQSPI_DUMMY_CLKS_PER_BYTE;
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 |= (addr_bytes - 1);
writel(reg, plat->regbase + CQSPI_REG_SIZE);
return 0;
}
static u32 cadence_qspi_get_rd_sram_level(struct cadence_spi_platdata *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_platdata *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;
}
int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *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 *= CQSPI_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("QSPI", 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;
}
/* Opcode + Address (3/4 bytes) */
int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
unsigned int cmdlen, const u8 *cmdbuf)
{
unsigned int reg;
unsigned int addr_bytes = cmdlen > 4 ? 4 : 3;
if (cmdlen < 4 || cmdbuf == NULL) {
printf("QSPI: iInvalid input argument, len %d cmdbuf 0x%08x\n",
cmdlen, (unsigned int)cmdbuf);
return -EINVAL;
}
/* Setup the indirect trigger address */
writel((u32)plat->ahbbase,
plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
/* Configure the opcode */
reg = cmdbuf[0] << CQSPI_REG_WR_INSTR_OPCODE_LSB;
writel(reg, plat->regbase + CQSPI_REG_WR_INSTR);
/* Setup write address. */
reg = cadence_qspi_apb_cmd2addr(&cmdbuf[1], addr_bytes);
writel(reg, plat->regbase + CQSPI_REG_INDIRECTWRSTARTADDR);
reg = readl(plat->regbase + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
reg |= (addr_bytes - 1);
writel(reg, plat->regbase + CQSPI_REG_SIZE);
return 0;
}
int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat,
unsigned int n_tx, const u8 *txbuf)
{
unsigned int page_size = plat->page_size;
unsigned int remaining = n_tx;
unsigned int write_bytes;
int ret;
/* 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);
while (remaining > 0) {
write_bytes = remaining > page_size ? page_size : remaining;
/* Handle non-4-byte aligned access to avoid data abort. */
if (((uintptr_t)txbuf % 4) || (write_bytes % 4))
writesb(plat->ahbbase, txbuf, write_bytes);
else
writesl(plat->ahbbase, txbuf, write_bytes >> 2);
ret = wait_for_bit("QSPI", 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;
}
txbuf += write_bytes;
remaining -= write_bytes;
}
/* Check indirect done status */
ret = wait_for_bit("QSPI", 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);
return 0;
failwr:
/* Cancel the indirect write */
writel(CQSPI_REG_INDIRECTWR_CANCEL,
plat->regbase + CQSPI_REG_INDIRECTWR);
return ret;
}
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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