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authorLinus Torvalds <torvalds@linux-foundation.org>2018-12-25 14:43:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-25 14:43:54 -0800
commit0051db82182bfd80d6c76982bcb36b09eb338a89 (patch)
tree5e58aa94cd1f77ef7a4e7b15cfbfac49760ff4a9 /drivers/mtd
parent79f20778fb228ae372cd7602745382fd4543ef31 (diff)
parent74ff666bd7ba2da563f99f2a8af7bf9f20008bc9 (diff)
Merge tag 'spi-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown: "The main thing this release has been a lot of work on the integration with SPI NOR flashes, there's been some specific support for a while for controller features designed to make them perform better but it's not worked out as well as hoped so the interface has been redesigned in a way that will hopefully do better - it's already been adopted by a number of additional controllers so things are looking good. Otherwise most of the work has been driver specific: - Support for better integration with NOR flashes from Boris Brezillon and Yogesh Narayan Gaur plus usage of it in several drivers. - A big cleanup of the Rockchip driver from Emil Renner Berthing. - Lots of performance improvements for bcm2835 from Lukas Wunner. - Slave mode support for pxa2xx from Lubomir Rintel. - Support for Macronix MXIC, Mediatek MT7629 and MT8183, NPCM PSPI, and Renesas r8a77470" * tag 'spi-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (90 commits) spi: sh-msiof: Reduce the number of times write to and perform the transmission from FIFO spi: sh-msiof: Add r8a774c0 support doc: lpspi: Document DT bindings for LPSPI slave mode spi: lpspi: Let watermark change with send data length spi: lpspi: Add slave mode support spi: lpspi: Replace all "master" with "controller" spi: imx: drop useless member speed_hz from driver data struct spi: imx: rename config callback and add useful parameters spi: imx: style fixes spi: imx: mx51-ecspi: Move some initialisation to prepare_message hook. spi: imx: add a device specific prepare_message callback mtd: atmel-quadspi: disallow building on ebsa110 spi: Update NPCM PSPI controller documentation spi: npcm: Modify pspi send function spi: Use of_node_name_eq for node name comparisons spi: dw-mmio: add ACPI support spi: bcm2835: Synchronize with callback on DMA termination spi: bcm2835: Speed up FIFO access if fill level is known spi: bcm2835: Polish transfer of DMA prologue spi: spi-mem: add support for octal mode I/O data transfer ...
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/spi-nor/Kconfig9
-rw-r--r--drivers/mtd/spi-nor/Makefile1
-rw-r--r--drivers/mtd/spi-nor/atmel-quadspi.c781
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");