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arm64: versal: Add versal specific cadence ospi driver

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Add support for cadence ospi driver for Versal platform. This driver
provides support for DMA read operation which utilizes cadence qspi
driver.
If "cdns,is-dma" DT property is specified use dma for read operation
from cadence_qspi driver. As cadence_qspi_apb_dma_read() is defined in
cadence_ospi_versal driver add a weak function defination in
cadence_qspi driver.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/20220512100535.16364-3-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
T Karthik Reddy 2022-05-12 04:05:32 -06:00 committed by Michal Simek
parent 1e2b8139d9
commit cf553bf20e
8 changed files with 159 additions and 4 deletions
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1
MAINTAINERS
View file

@ -640,6 +640,7 @@ T: git https://source.denx.de/u-boot/custodians/u-boot-microblaze.git
F: arch/arm/mach-versal/
F: drivers/net/xilinx_axi_mrmac.*
F: drivers/soc/soc_xilinx_versal.c
F: drivers/spi/cadence_ospi_versal.c
F: drivers/watchdog/xilinx_wwdt.c
N: (?<!uni)versal

2
configs/xilinx_versal_virt_defconfig
View file

@ -106,6 +106,8 @@ CONFIG_XILINX_UARTLITE=y
CONFIG_SOC_XILINX_VERSAL=y
CONFIG_SPI=y
CONFIG_DM_SPI=y
CONFIG_CADENCE_QSPI=y
CONFIG_CADENCE_OSPI_VERSAL=y
CONFIG_ZYNQ_SPI=y
CONFIG_USB=y
CONFIG_DM_USB_GADGET=y

8
drivers/spi/Kconfig
View file

@ -136,6 +136,14 @@ config CQSPI_REF_CLK
int "Cadence QSPI reference clock value in Hz"
depends on HAS_CQSPI_REF_CLK
config CADENCE_OSPI_VERSAL
bool "Configure Versal OSPI"
depends on ARCH_VERSAL && CADENCE_QSPI
imply DM_GPIO
help
This option is used to enable Versal OSPI DMA operations which
are used for ospi flash read using cadence qspi controller.
config CF_SPI
bool "ColdFire SPI driver"
help

1
drivers/spi/Makefile
View file

@ -7,6 +7,7 @@
ifdef CONFIG_$(SPL_TPL_)DM_SPI
obj-y += spi-uclass.o
obj-$(CONFIG_CADENCE_QSPI) += cadence_qspi.o cadence_qspi_apb.o
obj-$(CONFIG_CADENCE_OSPI_VERSAL) += cadence_ospi_versal.o
obj-$(CONFIG_SANDBOX) += spi-emul-uclass.o
obj-$(CONFIG_SOFT_SPI) += soft_spi.o
obj-$(CONFIG_SPI_MEM) += spi-mem.o

127
drivers/spi/cadence_ospi_versal.c Normal file
View file

@ -0,0 +1,127 @@
// SPDX-License-Identifier: GPL-2.0
/*
* (C) Copyright 2018 Xilinx
*
* Cadence QSPI controller DMA operations
*/
#include <clk.h>
#include <common.h>
#include <memalign.h>
#include <wait_bit.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/cache.h>
#include <cpu_func.h>
#include <zynqmp_firmware.h>
#include <asm/arch/hardware.h>
#include "cadence_qspi.h"
#include <dt-bindings/power/xlnx-versal-power.h>
#define CMD_4BYTE_READ 0x13
#define CMD_4BYTE_FAST_READ 0x0C
int cadence_qspi_apb_dma_read(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
u32 reg, ret, rx_rem, n_rx, bytes_to_dma, data;
u8 opcode, addr_bytes, *rxbuf, dummy_cycles;
n_rx = op->data.nbytes;
rxbuf = op->data.buf.in;
rx_rem = n_rx % 4;
bytes_to_dma = n_rx - rx_rem;
if (bytes_to_dma) {
reg = readl(plat->regbase + CQSPI_REG_CONFIG);
reg |= CQSPI_REG_CONFIG_ENBL_DMA;
writel(reg, plat->regbase + CQSPI_REG_CONFIG);
writel(bytes_to_dma, plat->regbase + CQSPI_REG_INDIRECTRDBYTES);
writel(CQSPI_DFLT_INDIR_TRIG_ADDR_RANGE,
plat->regbase + CQSPI_REG_INDIR_TRIG_ADDR_RANGE);
writel(CQSPI_DFLT_DMA_PERIPH_CFG,
plat->regbase + CQSPI_REG_DMA_PERIPH_CFG);
writel((unsigned long)rxbuf, plat->regbase +
CQSPI_DMA_DST_ADDR_REG);
writel(plat->trigger_address, plat->regbase +
CQSPI_DMA_SRC_RD_ADDR_REG);
writel(bytes_to_dma, plat->regbase +
CQSPI_DMA_DST_SIZE_REG);
flush_dcache_range((unsigned long)rxbuf,
(unsigned long)rxbuf + bytes_to_dma);
writel(CQSPI_DFLT_DST_CTRL_REG_VAL,
plat->regbase + CQSPI_DMA_DST_CTRL_REG);
/* Start the indirect read transfer */
writel(CQSPI_REG_INDIRECTRD_START, plat->regbase +
CQSPI_REG_INDIRECTRD);
/* Wait for dma to complete transfer */
ret = cadence_qspi_apb_wait_for_dma_cmplt(plat);
if (ret)
return ret;
/* Clear indirect completion status */
writel(CQSPI_REG_INDIRECTRD_DONE, plat->regbase +
CQSPI_REG_INDIRECTRD);
rxbuf += bytes_to_dma;
}
if (rx_rem) {
reg = readl(plat->regbase + CQSPI_REG_CONFIG);
reg &= ~CQSPI_REG_CONFIG_ENBL_DMA;
writel(reg, plat->regbase + CQSPI_REG_CONFIG);
reg = readl(plat->regbase + CQSPI_REG_INDIRECTRDSTARTADDR);
reg += bytes_to_dma;
writel(reg, plat->regbase + CQSPI_REG_CMDADDRESS);
addr_bytes = readl(plat->regbase + CQSPI_REG_SIZE) &
CQSPI_REG_SIZE_ADDRESS_MASK;
opcode = CMD_4BYTE_FAST_READ;
dummy_cycles = 8;
writel((dummy_cycles << CQSPI_REG_RD_INSTR_DUMMY_LSB) | opcode,
plat->regbase + CQSPI_REG_RD_INSTR);
reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
reg |= (addr_bytes & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK) <<
CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
dummy_cycles = (readl(plat->regbase + CQSPI_REG_RD_INSTR) >>
CQSPI_REG_RD_INSTR_DUMMY_LSB) &
CQSPI_REG_RD_INSTR_DUMMY_MASK;
reg |= (dummy_cycles & CQSPI_REG_CMDCTRL_DUMMY_MASK) <<
CQSPI_REG_CMDCTRL_DUMMY_LSB;
reg |= (((rx_rem - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK) <<
CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
ret = cadence_qspi_apb_exec_flash_cmd(plat->regbase, reg);
if (ret)
return ret;
data = readl(plat->regbase + CQSPI_REG_CMDREADDATALOWER);
memcpy(rxbuf, &data, rx_rem);
}
return 0;
}
int cadence_qspi_apb_wait_for_dma_cmplt(struct cadence_spi_plat *plat)
{
u32 timeout = CQSPI_DMA_TIMEOUT;
while (!(readl(plat->regbase + CQSPI_DMA_DST_I_STS_REG) &
CQSPI_DMA_DST_I_STS_DONE) && timeout--)
udelay(1);
if (!timeout) {
printf("DMA timeout\n");
return -ETIMEDOUT;
}
writel(readl(plat->regbase + CQSPI_DMA_DST_I_STS_REG),
plat->regbase + CQSPI_DMA_DST_I_STS_REG);
return 0;
}

16
drivers/spi/cadence_qspi.c
View file

@ -27,6 +27,12 @@
#define CQSPI_READ 2
#define CQSPI_WRITE 3
__weak int cadence_qspi_apb_dma_read(struct cadence_spi_plat *plat,
const struct spi_mem_op *op)
{
return 0;
}
static int cadence_spi_write_speed(struct udevice *bus, uint hz)
{
struct cadence_spi_plat *plat = dev_get_plat(bus);
@ -288,8 +294,12 @@ static int cadence_spi_mem_exec_op(struct spi_slave *spi,
break;
case CQSPI_READ:
err = cadence_qspi_apb_read_setup(plat, op);
if (!err)
err = cadence_qspi_apb_read_execute(plat, op);
if (!err) {
if (plat->is_dma)
err = cadence_qspi_apb_dma_read(plat, op);
else
err = cadence_qspi_apb_read_execute(plat, op);
}
break;
case CQSPI_WRITE:
err = cadence_qspi_apb_write_setup(plat, op);
@ -342,6 +352,8 @@ static int cadence_spi_of_to_plat(struct udevice *bus)
if (plat->ahbsize >= SZ_8M)
plat->use_dac_mode = true;
plat->is_dma = dev_read_bool(bus, "cdns,is-dma");
/* All other paramters are embedded in the child node */
subnode = dev_read_first_subnode(bus);
if (!ofnode_valid(subnode)) {

5
drivers/spi/cadence_qspi.h
View file

@ -224,6 +224,7 @@ struct cadence_spi_plat {
u8 addr_width;
u8 data_width;
bool dtr;
bool is_dma;
};
struct cadence_spi_priv {
@ -278,5 +279,9 @@ void cadence_qspi_apb_enter_xip(void *reg_base, char xip_dummy);
void cadence_qspi_apb_readdata_capture(void *reg_base,
unsigned int bypass, unsigned int delay);
unsigned int cm_get_qspi_controller_clk_hz(void);
int cadence_qspi_apb_dma_read(struct cadence_spi_plat *plat,
const struct spi_mem_op *op);
int cadence_qspi_apb_wait_for_dma_cmplt(struct cadence_spi_plat *plat);
int cadence_qspi_apb_exec_flash_cmd(void *reg_base, unsigned int reg);
#endif /* __CADENCE_QSPI_H__ */

3
drivers/spi/cadence_qspi_apb.c
View file

@ -336,8 +336,7 @@ void cadence_qspi_apb_controller_init(struct cadence_spi_plat *plat)
cadence_qspi_apb_controller_enable(plat->regbase);
}
static int cadence_qspi_apb_exec_flash_cmd(void *reg_base,
unsigned int reg)
int cadence_qspi_apb_exec_flash_cmd(void *reg_base, unsigned int reg)
{
unsigned int retry = CQSPI_REG_RETRY;