diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/atmel-quadspi.c | 781 |
3 files changed, 0 insertions, 791 deletions
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig index 6cc9c929ff57..44fe8018733c 100644 --- a/drivers/mtd/spi-nor/Kconfig +++ b/drivers/mtd/spi-nor/Kconfig @@ -39,15 +39,6 @@ config SPI_ASPEED_SMC and support for the SPI flash memory controller (SPI) for the host firmware. The implementation only supports SPI NOR. -config SPI_ATMEL_QUADSPI - tristate "Atmel Quad SPI Controller" - depends on ARCH_AT91 || (ARM && COMPILE_TEST) - depends on OF && HAS_IOMEM - help - This enables support for the Quad SPI controller in master mode. - This driver does not support generic SPI. The implementation only - supports SPI NOR. - config SPI_CADENCE_QUADSPI tristate "Cadence Quad SPI controller" depends on OF && (ARM || ARM64 || COMPILE_TEST) diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile index f4c61d282abd..a552efd22958 100644 --- a/drivers/mtd/spi-nor/Makefile +++ b/drivers/mtd/spi-nor/Makefile @@ -1,7 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o obj-$(CONFIG_SPI_ASPEED_SMC) += aspeed-smc.o -obj-$(CONFIG_SPI_ATMEL_QUADSPI) += atmel-quadspi.o obj-$(CONFIG_SPI_CADENCE_QUADSPI) += cadence-quadspi.o obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o obj-$(CONFIG_SPI_HISI_SFC) += hisi-sfc.o diff --git a/drivers/mtd/spi-nor/atmel-quadspi.c b/drivers/mtd/spi-nor/atmel-quadspi.c deleted file mode 100644 index 820048726b4f..000000000000 --- a/drivers/mtd/spi-nor/atmel-quadspi.c +++ /dev/null @@ -1,781 +0,0 @@ -/* - * Driver for Atmel QSPI Controller - * - * Copyright (C) 2015 Atmel Corporation - * - * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program. If not, see <http://www.gnu.org/licenses/>. - * - * This driver is based on drivers/mtd/spi-nor/fsl-quadspi.c from Freescale. - */ - -#include <linux/kernel.h> -#include <linux/clk.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/interrupt.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/partitions.h> -#include <linux/mtd/spi-nor.h> -#include <linux/platform_data/atmel.h> -#include <linux/of.h> - -#include <linux/io.h> -#include <linux/gpio/consumer.h> - -/* QSPI register offsets */ -#define QSPI_CR 0x0000 /* Control Register */ -#define QSPI_MR 0x0004 /* Mode Register */ -#define QSPI_RD 0x0008 /* Receive Data Register */ -#define QSPI_TD 0x000c /* Transmit Data Register */ -#define QSPI_SR 0x0010 /* Status Register */ -#define QSPI_IER 0x0014 /* Interrupt Enable Register */ -#define QSPI_IDR 0x0018 /* Interrupt Disable Register */ -#define QSPI_IMR 0x001c /* Interrupt Mask Register */ -#define QSPI_SCR 0x0020 /* Serial Clock Register */ - -#define QSPI_IAR 0x0030 /* Instruction Address Register */ -#define QSPI_ICR 0x0034 /* Instruction Code Register */ -#define QSPI_IFR 0x0038 /* Instruction Frame Register */ - -#define QSPI_SMR 0x0040 /* Scrambling Mode Register */ -#define QSPI_SKR 0x0044 /* Scrambling Key Register */ - -#define QSPI_WPMR 0x00E4 /* Write Protection Mode Register */ -#define QSPI_WPSR 0x00E8 /* Write Protection Status Register */ - -#define QSPI_VERSION 0x00FC /* Version Register */ - - -/* Bitfields in QSPI_CR (Control Register) */ -#define QSPI_CR_QSPIEN BIT(0) -#define QSPI_CR_QSPIDIS BIT(1) -#define QSPI_CR_SWRST BIT(7) -#define QSPI_CR_LASTXFER BIT(24) - -/* Bitfields in QSPI_MR (Mode Register) */ -#define QSPI_MR_SSM BIT(0) -#define QSPI_MR_LLB BIT(1) -#define QSPI_MR_WDRBT BIT(2) -#define QSPI_MR_SMRM BIT(3) -#define QSPI_MR_CSMODE_MASK GENMASK(5, 4) -#define QSPI_MR_CSMODE_NOT_RELOADED (0 << 4) -#define QSPI_MR_CSMODE_LASTXFER (1 << 4) -#define QSPI_MR_CSMODE_SYSTEMATICALLY (2 << 4) -#define QSPI_MR_NBBITS_MASK GENMASK(11, 8) -#define QSPI_MR_NBBITS(n) ((((n) - 8) << 8) & QSPI_MR_NBBITS_MASK) -#define QSPI_MR_DLYBCT_MASK GENMASK(23, 16) -#define QSPI_MR_DLYBCT(n) (((n) << 16) & QSPI_MR_DLYBCT_MASK) -#define QSPI_MR_DLYCS_MASK GENMASK(31, 24) -#define QSPI_MR_DLYCS(n) (((n) << 24) & QSPI_MR_DLYCS_MASK) - -/* Bitfields in QSPI_SR/QSPI_IER/QSPI_IDR/QSPI_IMR */ -#define QSPI_SR_RDRF BIT(0) -#define QSPI_SR_TDRE BIT(1) -#define QSPI_SR_TXEMPTY BIT(2) -#define QSPI_SR_OVRES BIT(3) -#define QSPI_SR_CSR BIT(8) -#define QSPI_SR_CSS BIT(9) -#define QSPI_SR_INSTRE BIT(10) -#define QSPI_SR_QSPIENS BIT(24) - -#define QSPI_SR_CMD_COMPLETED (QSPI_SR_INSTRE | QSPI_SR_CSR) - -/* Bitfields in QSPI_SCR (Serial Clock Register) */ -#define QSPI_SCR_CPOL BIT(0) -#define QSPI_SCR_CPHA BIT(1) -#define QSPI_SCR_SCBR_MASK GENMASK(15, 8) -#define QSPI_SCR_SCBR(n) (((n) << 8) & QSPI_SCR_SCBR_MASK) -#define QSPI_SCR_DLYBS_MASK GENMASK(23, 16) -#define QSPI_SCR_DLYBS(n) (((n) << 16) & QSPI_SCR_DLYBS_MASK) - -/* Bitfields in QSPI_ICR (Instruction Code Register) */ -#define QSPI_ICR_INST_MASK GENMASK(7, 0) -#define QSPI_ICR_INST(inst) (((inst) << 0) & QSPI_ICR_INST_MASK) -#define QSPI_ICR_OPT_MASK GENMASK(23, 16) -#define QSPI_ICR_OPT(opt) (((opt) << 16) & QSPI_ICR_OPT_MASK) - -/* Bitfields in QSPI_IFR (Instruction Frame Register) */ -#define QSPI_IFR_WIDTH_MASK GENMASK(2, 0) -#define QSPI_IFR_WIDTH_SINGLE_BIT_SPI (0 << 0) -#define QSPI_IFR_WIDTH_DUAL_OUTPUT (1 << 0) -#define QSPI_IFR_WIDTH_QUAD_OUTPUT (2 << 0) -#define QSPI_IFR_WIDTH_DUAL_IO (3 << 0) -#define QSPI_IFR_WIDTH_QUAD_IO (4 << 0) -#define QSPI_IFR_WIDTH_DUAL_CMD (5 << 0) -#define QSPI_IFR_WIDTH_QUAD_CMD (6 << 0) -#define QSPI_IFR_INSTEN BIT(4) -#define QSPI_IFR_ADDREN BIT(5) -#define QSPI_IFR_OPTEN BIT(6) -#define QSPI_IFR_DATAEN BIT(7) -#define QSPI_IFR_OPTL_MASK GENMASK(9, 8) -#define QSPI_IFR_OPTL_1BIT (0 << 8) -#define QSPI_IFR_OPTL_2BIT (1 << 8) -#define QSPI_IFR_OPTL_4BIT (2 << 8) -#define QSPI_IFR_OPTL_8BIT (3 << 8) -#define QSPI_IFR_ADDRL BIT(10) -#define QSPI_IFR_TFRTYP_MASK GENMASK(13, 12) -#define QSPI_IFR_TFRTYP_TRSFR_READ (0 << 12) -#define QSPI_IFR_TFRTYP_TRSFR_READ_MEM (1 << 12) -#define QSPI_IFR_TFRTYP_TRSFR_WRITE (2 << 12) -#define QSPI_IFR_TFRTYP_TRSFR_WRITE_MEM (3 << 13) -#define QSPI_IFR_CRM BIT(14) -#define QSPI_IFR_NBDUM_MASK GENMASK(20, 16) -#define QSPI_IFR_NBDUM(n) (((n) << 16) & QSPI_IFR_NBDUM_MASK) - -/* Bitfields in QSPI_SMR (Scrambling Mode Register) */ -#define QSPI_SMR_SCREN BIT(0) -#define QSPI_SMR_RVDIS BIT(1) - -/* Bitfields in QSPI_WPMR (Write Protection Mode Register) */ -#define QSPI_WPMR_WPEN BIT(0) -#define QSPI_WPMR_WPKEY_MASK GENMASK(31, 8) -#define QSPI_WPMR_WPKEY(wpkey) (((wpkey) << 8) & QSPI_WPMR_WPKEY_MASK) - -/* Bitfields in QSPI_WPSR (Write Protection Status Register) */ -#define QSPI_WPSR_WPVS BIT(0) -#define QSPI_WPSR_WPVSRC_MASK GENMASK(15, 8) -#define QSPI_WPSR_WPVSRC(src) (((src) << 8) & QSPI_WPSR_WPVSRC) - - -struct atmel_qspi { - void __iomem *regs; - void __iomem *mem; - struct clk *clk; - struct platform_device *pdev; - u32 pending; - - struct spi_nor nor; - u32 clk_rate; - struct completion cmd_completion; -}; - -struct atmel_qspi_command { - union { - struct { - u32 instruction:1; - u32 address:3; - u32 mode:1; - u32 dummy:1; - u32 data:1; - u32 reserved:25; - } bits; - u32 word; - } enable; - u8 instruction; - u8 mode; - u8 num_mode_cycles; - u8 num_dummy_cycles; - u32 address; - - size_t buf_len; - const void *tx_buf; - void *rx_buf; -}; - -/* Register access functions */ -static inline u32 qspi_readl(struct atmel_qspi *aq, u32 reg) -{ - return readl_relaxed(aq->regs + reg); -} - -static inline void qspi_writel(struct atmel_qspi *aq, u32 reg, u32 value) -{ - writel_relaxed(value, aq->regs + reg); -} - -static int atmel_qspi_run_transfer(struct atmel_qspi *aq, - const struct atmel_qspi_command *cmd) -{ - void __iomem *ahb_mem; - - /* Then fallback to a PIO transfer (memcpy() DOES NOT work!) */ - ahb_mem = aq->mem; - if (cmd->enable.bits.address) - ahb_mem += cmd->address; - if (cmd->tx_buf) - _memcpy_toio(ahb_mem, cmd->tx_buf, cmd->buf_len); - else - _memcpy_fromio(cmd->rx_buf, ahb_mem, cmd->buf_len); - - return 0; -} - -#ifdef DEBUG -static void atmel_qspi_debug_command(struct atmel_qspi *aq, - const struct atmel_qspi_command *cmd, - u32 ifr) -{ - u8 cmd_buf[SPI_NOR_MAX_CMD_SIZE]; - size_t len = 0; - int i; - - if (cmd->enable.bits.instruction) - cmd_buf[len++] = cmd->instruction; - - for (i = cmd->enable.bits.address-1; i >= 0; --i) - cmd_buf[len++] = (cmd->address >> (i << 3)) & 0xff; - - if (cmd->enable.bits.mode) - cmd_buf[len++] = cmd->mode; - - if (cmd->enable.bits.dummy) { - int num = cmd->num_dummy_cycles; - - switch (ifr & QSPI_IFR_WIDTH_MASK) { - case QSPI_IFR_WIDTH_SINGLE_BIT_SPI: - case QSPI_IFR_WIDTH_DUAL_OUTPUT: - case QSPI_IFR_WIDTH_QUAD_OUTPUT: - num >>= 3; - break; - case QSPI_IFR_WIDTH_DUAL_IO: - case QSPI_IFR_WIDTH_DUAL_CMD: - num >>= 2; - break; - case QSPI_IFR_WIDTH_QUAD_IO: - case QSPI_IFR_WIDTH_QUAD_CMD: - num >>= 1; - break; - default: - return; - } - - for (i = 0; i < num; ++i) - cmd_buf[len++] = 0; - } - - /* Dump the SPI command */ - print_hex_dump(KERN_DEBUG, "qspi cmd: ", DUMP_PREFIX_NONE, - 32, 1, cmd_buf, len, false); - -#ifdef VERBOSE_DEBUG - /* If verbose debug is enabled, also dump the TX data */ - if (cmd->enable.bits.data && cmd->tx_buf) - print_hex_dump(KERN_DEBUG, "qspi tx : ", DUMP_PREFIX_NONE, - 32, 1, cmd->tx_buf, cmd->buf_len, false); -#endif -} -#else -#define atmel_qspi_debug_command(aq, cmd, ifr) -#endif - -static int atmel_qspi_run_command(struct atmel_qspi *aq, - const struct atmel_qspi_command *cmd, - u32 ifr_tfrtyp, enum spi_nor_protocol proto) -{ - u32 iar, icr, ifr, sr; - int err = 0; - - iar = 0; - icr = 0; - ifr = ifr_tfrtyp; - - /* Set the SPI protocol */ - switch (proto) { - case SNOR_PROTO_1_1_1: - ifr |= QSPI_IFR_WIDTH_SINGLE_BIT_SPI; - break; - - case SNOR_PROTO_1_1_2: - ifr |= QSPI_IFR_WIDTH_DUAL_OUTPUT; - break; - - case SNOR_PROTO_1_1_4: - ifr |= QSPI_IFR_WIDTH_QUAD_OUTPUT; - break; - - case SNOR_PROTO_1_2_2: - ifr |= QSPI_IFR_WIDTH_DUAL_IO; - break; - - case SNOR_PROTO_1_4_4: - ifr |= QSPI_IFR_WIDTH_QUAD_IO; - break; - - case SNOR_PROTO_2_2_2: - ifr |= QSPI_IFR_WIDTH_DUAL_CMD; - break; - - case SNOR_PROTO_4_4_4: - ifr |= QSPI_IFR_WIDTH_QUAD_CMD; - break; - - default: - return -EINVAL; - } - - /* Compute instruction parameters */ - if (cmd->enable.bits.instruction) { - icr |= QSPI_ICR_INST(cmd->instruction); - ifr |= QSPI_IFR_INSTEN; - } - - /* Compute address parameters */ - switch (cmd->enable.bits.address) { - case 4: - ifr |= QSPI_IFR_ADDRL; - /* fall through to the 24bit (3 byte) address case. */ - case 3: - iar = (cmd->enable.bits.data) ? 0 : cmd->address; - ifr |= QSPI_IFR_ADDREN; - break; - case 0: - break; - default: - return -EINVAL; - } - - /* Compute option parameters */ - if (cmd->enable.bits.mode && cmd->num_mode_cycles) { - u32 mode_cycle_bits, mode_bits; - - icr |= QSPI_ICR_OPT(cmd->mode); - ifr |= QSPI_IFR_OPTEN; - - switch (ifr & QSPI_IFR_WIDTH_MASK) { - case QSPI_IFR_WIDTH_SINGLE_BIT_SPI: - case QSPI_IFR_WIDTH_DUAL_OUTPUT: - case QSPI_IFR_WIDTH_QUAD_OUTPUT: - mode_cycle_bits = 1; - break; - case QSPI_IFR_WIDTH_DUAL_IO: - case QSPI_IFR_WIDTH_DUAL_CMD: - mode_cycle_bits = 2; - break; - case QSPI_IFR_WIDTH_QUAD_IO: - case QSPI_IFR_WIDTH_QUAD_CMD: - mode_cycle_bits = 4; - break; - default: - return -EINVAL; - } - - mode_bits = cmd->num_mode_cycles * mode_cycle_bits; - switch (mode_bits) { - case 1: - ifr |= QSPI_IFR_OPTL_1BIT; - break; - - case 2: - ifr |= QSPI_IFR_OPTL_2BIT; - break; - - case 4: - ifr |= QSPI_IFR_OPTL_4BIT; - break; - - case 8: - ifr |= QSPI_IFR_OPTL_8BIT; - break; - - default: - return -EINVAL; - } - } - - /* Set number of dummy cycles */ - if (cmd->enable.bits.dummy) - ifr |= QSPI_IFR_NBDUM(cmd->num_dummy_cycles); - - /* Set data enable */ - if (cmd->enable.bits.data) { - ifr |= QSPI_IFR_DATAEN; - - /* Special case for Continuous Read Mode */ - if (!cmd->tx_buf && !cmd->rx_buf) - ifr |= QSPI_IFR_CRM; - } - - /* Clear pending interrupts */ - (void)qspi_readl(aq, QSPI_SR); - - /* Set QSPI Instruction Frame registers */ - atmel_qspi_debug_command(aq, cmd, ifr); - qspi_writel(aq, QSPI_IAR, iar); - qspi_writel(aq, QSPI_ICR, icr); - qspi_writel(aq, QSPI_IFR, ifr); - - /* Skip to the final steps if there is no data */ - if (!cmd->enable.bits.data) - goto no_data; - - /* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */ - (void)qspi_readl(aq, QSPI_IFR); - - /* Stop here for continuous read */ - if (!cmd->tx_buf && !cmd->rx_buf) - return 0; - /* Send/Receive data */ - err = atmel_qspi_run_transfer(aq, cmd); - - /* Release the chip-select */ - qspi_writel(aq, QSPI_CR, QSPI_CR_LASTXFER); - - if (err) - return err; - -#if defined(DEBUG) && defined(VERBOSE_DEBUG) - /* - * If verbose debug is enabled, also dump the RX data in addition to - * the SPI command previously dumped by atmel_qspi_debug_command() - */ - if (cmd->rx_buf) - print_hex_dump(KERN_DEBUG, "qspi rx : ", DUMP_PREFIX_NONE, - 32, 1, cmd->rx_buf, cmd->buf_len, false); -#endif -no_data: - /* Poll INSTRuction End status */ - sr = qspi_readl(aq, QSPI_SR); - if ((sr & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED) - return err; - - /* Wait for INSTRuction End interrupt */ - reinit_completion(&aq->cmd_completion); - aq->pending = sr & QSPI_SR_CMD_COMPLETED; - qspi_writel(aq, QSPI_IER, QSPI_SR_CMD_COMPLETED); - if (!wait_for_completion_timeout(&aq->cmd_completion, - msecs_to_jiffies(1000))) - err = -ETIMEDOUT; - qspi_writel(aq, QSPI_IDR, QSPI_SR_CMD_COMPLETED); - - return err; -} - -static int atmel_qspi_read_reg(struct spi_nor *nor, u8 opcode, - u8 *buf, int len) -{ - struct atmel_qspi *aq = nor->priv; - struct atmel_qspi_command cmd; - - memset(&cmd, 0, sizeof(cmd)); - cmd.enable.bits.instruction = 1; - cmd.enable.bits.data = 1; - cmd.instruction = opcode; - cmd.rx_buf = buf; - cmd.buf_len = len; - return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ, - nor->reg_proto); -} - -static int atmel_qspi_write_reg(struct spi_nor *nor, u8 opcode, - u8 *buf, int len) -{ - struct atmel_qspi *aq = nor->priv; - struct atmel_qspi_command cmd; - - memset(&cmd, 0, sizeof(cmd)); - cmd.enable.bits.instruction = 1; - cmd.enable.bits.data = (buf != NULL && len > 0); - cmd.instruction = opcode; - cmd.tx_buf = buf; - cmd.buf_len = len; - return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE, - nor->reg_proto); -} - -static ssize_t atmel_qspi_write(struct spi_nor *nor, loff_t to, size_t len, - const u_char *write_buf) -{ - struct atmel_qspi *aq = nor->priv; - struct atmel_qspi_command cmd; - ssize_t ret; - - memset(&cmd, 0, sizeof(cmd)); - cmd.enable.bits.instruction = 1; - cmd.enable.bits.address = nor->addr_width; - cmd.enable.bits.data = 1; - cmd.instruction = nor->program_opcode; - cmd.address = (u32)to; - cmd.tx_buf = write_buf; - cmd.buf_len = len; - ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE_MEM, - nor->write_proto); - return (ret < 0) ? ret : len; -} - -static int atmel_qspi_erase(struct spi_nor *nor, loff_t offs) -{ - struct atmel_qspi *aq = nor->priv; - struct atmel_qspi_command cmd; - - memset(&cmd, 0, sizeof(cmd)); - cmd.enable.bits.instruction = 1; - cmd.enable.bits.address = nor->addr_width; - cmd.instruction = nor->erase_opcode; - cmd.address = (u32)offs; - return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE, - nor->reg_proto); -} - -static ssize_t atmel_qspi_read(struct spi_nor *nor, loff_t from, size_t len, - u_char *read_buf) -{ - struct atmel_qspi *aq = nor->priv; - struct atmel_qspi_command cmd; - u8 num_mode_cycles, num_dummy_cycles; - ssize_t ret; - - if (nor->read_dummy >= 2) { - num_mode_cycles = 2; - num_dummy_cycles = nor->read_dummy - 2; - } else { - num_mode_cycles = nor->read_dummy; - num_dummy_cycles = 0; - } - - memset(&cmd, 0, sizeof(cmd)); - cmd.enable.bits.instruction = 1; - cmd.enable.bits.address = nor->addr_width; - cmd.enable.bits.mode = (num_mode_cycles > 0); - cmd.enable.bits.dummy = (num_dummy_cycles > 0); - cmd.enable.bits.data = 1; - cmd.instruction = nor->read_opcode; - cmd.address = (u32)from; - cmd.mode = 0xff; /* This value prevents from entering the 0-4-4 mode */ - cmd.num_mode_cycles = num_mode_cycles; - cmd.num_dummy_cycles = num_dummy_cycles; - cmd.rx_buf = read_buf; - cmd.buf_len = len; - ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ_MEM, - nor->read_proto); - return (ret < 0) ? ret : len; -} - -static int atmel_qspi_init(struct atmel_qspi *aq) -{ - unsigned long src_rate; - u32 mr, scr, scbr; - - /* Reset the QSPI controller */ - qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST); - - /* Set the QSPI controller in Serial Memory Mode */ - mr = QSPI_MR_NBBITS(8) | QSPI_MR_SSM; - qspi_writel(aq, QSPI_MR, mr); - - src_rate = clk_get_rate(aq->clk); - if (!src_rate) - return -EINVAL; - - /* Compute the QSPI baudrate */ - scbr = DIV_ROUND_UP(src_rate, aq->clk_rate); - if (scbr > 0) - scbr--; - scr = QSPI_SCR_SCBR(scbr); - qspi_writel(aq, QSPI_SCR, scr); - - /* Enable the QSPI controller */ - qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIEN); - - return 0; -} - -static irqreturn_t atmel_qspi_interrupt(int irq, void *dev_id) -{ - struct atmel_qspi *aq = (struct atmel_qspi *)dev_id; - u32 status, mask, pending; - - status = qspi_readl(aq, QSPI_SR); - mask = qspi_readl(aq, QSPI_IMR); - pending = status & mask; - - if (!pending) - return IRQ_NONE; - - aq->pending |= pending; - if ((aq->pending & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED) - complete(&aq->cmd_completion); - - return IRQ_HANDLED; -} - -static int atmel_qspi_probe(struct platform_device *pdev) -{ - const struct spi_nor_hwcaps hwcaps = { - .mask = SNOR_HWCAPS_READ | - SNOR_HWCAPS_READ_FAST | - SNOR_HWCAPS_READ_1_1_2 | - SNOR_HWCAPS_READ_1_2_2 | - SNOR_HWCAPS_READ_2_2_2 | - SNOR_HWCAPS_READ_1_1_4 | - SNOR_HWCAPS_READ_1_4_4 | - SNOR_HWCAPS_READ_4_4_4 | - SNOR_HWCAPS_PP | - SNOR_HWCAPS_PP_1_1_4 | - SNOR_HWCAPS_PP_1_4_4 | - SNOR_HWCAPS_PP_4_4_4, - }; - struct device_node *child, *np = pdev->dev.of_node; - struct atmel_qspi *aq; - struct resource *res; - struct spi_nor *nor; - struct mtd_info *mtd; - int irq, err = 0; - - if (of_get_child_count(np) != 1) - return -ENODEV; - child = of_get_next_child(np, NULL); - - aq = devm_kzalloc(&pdev->dev, sizeof(*aq), GFP_KERNEL); - if (!aq) { - err = -ENOMEM; - goto exit; - } - - platform_set_drvdata(pdev, aq); - init_completion(&aq->cmd_completion); - aq->pdev = pdev; - - /* Map the registers */ - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base"); - aq->regs = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(aq->regs)) { - dev_err(&pdev->dev, "missing registers\n"); - err = PTR_ERR(aq->regs); - goto exit; - } - - /* Map the AHB memory */ - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mmap"); - aq->mem = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(aq->mem)) { - dev_err(&pdev->dev, "missing AHB memory\n"); - err = PTR_ERR(aq->mem); - goto exit; - } - - /* Get the peripheral clock */ - aq->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(aq->clk)) { - dev_err(&pdev->dev, "missing peripheral clock\n"); - err = PTR_ERR(aq->clk); - goto exit; - } - - /* Enable the peripheral clock */ - err = clk_prepare_enable(aq->clk); - if (err) { - dev_err(&pdev->dev, "failed to enable the peripheral clock\n"); - goto exit; - } - - /* Request the IRQ */ - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "missing IRQ\n"); - err = irq; - goto disable_clk; - } - err = devm_request_irq(&pdev->dev, irq, atmel_qspi_interrupt, - 0, dev_name(&pdev->dev), aq); - if (err) - goto disable_clk; - - /* Setup the spi-nor */ - nor = &aq->nor; - mtd = &nor->mtd; - - nor->dev = &pdev->dev; - spi_nor_set_flash_node(nor, child); - nor->priv = aq; - mtd->priv = nor; - - nor->read_reg = atmel_qspi_read_reg; - nor->write_reg = atmel_qspi_write_reg; - nor->read = atmel_qspi_read; - nor->write = atmel_qspi_write; - nor->erase = atmel_qspi_erase; - - err = of_property_read_u32(child, "spi-max-frequency", &aq->clk_rate); - if (err < 0) - goto disable_clk; - - err = atmel_qspi_init(aq); - if (err) - goto disable_clk; - - err = spi_nor_scan(nor, NULL, &hwcaps); - if (err) - goto disable_clk; - - err = mtd_device_register(mtd, NULL, 0); - if (err) - goto disable_clk; - - of_node_put(child); - - return 0; - -disable_clk: - clk_disable_unprepare(aq->clk); -exit: - of_node_put(child); - - return err; -} - -static int atmel_qspi_remove(struct platform_device *pdev) -{ - struct atmel_qspi *aq = platform_get_drvdata(pdev); - - mtd_device_unregister(&aq->nor.mtd); - qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIDIS); - clk_disable_unprepare(aq->clk); - return 0; -} - -static int __maybe_unused atmel_qspi_suspend(struct device *dev) -{ - struct atmel_qspi *aq = dev_get_drvdata(dev); - - clk_disable_unprepare(aq->clk); - - return 0; -} - -static int __maybe_unused atmel_qspi_resume(struct device *dev) -{ - struct atmel_qspi *aq = dev_get_drvdata(dev); - - clk_prepare_enable(aq->clk); - - return atmel_qspi_init(aq); -} - -static SIMPLE_DEV_PM_OPS(atmel_qspi_pm_ops, atmel_qspi_suspend, - atmel_qspi_resume); - -static const struct of_device_id atmel_qspi_dt_ids[] = { - { .compatible = "atmel,sama5d2-qspi" }, - { /* sentinel */ } -}; - -MODULE_DEVICE_TABLE(of, atmel_qspi_dt_ids); - -static struct platform_driver atmel_qspi_driver = { - .driver = { - .name = "atmel_qspi", - .of_match_table = atmel_qspi_dt_ids, - .pm = &atmel_qspi_pm_ops, - }, - .probe = atmel_qspi_probe, - .remove = atmel_qspi_remove, -}; -module_platform_driver(atmel_qspi_driver); - -MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>"); -MODULE_DESCRIPTION("Atmel QSPI Controller driver"); -MODULE_LICENSE("GPL v2"); |