From: Tudor Ambarus tudor.ambarus@microchip.com
Backport the driver from linux v5.1-rc5 and adapt it for u-boot. Tested on sama5d2_xplained Rev B with mx25l25635e spi-nor flash.
Signed-off-by: Tudor Ambarus tudor.ambarus@microchip.com --- drivers/spi/Kconfig | 7 + drivers/spi/Makefile | 1 + drivers/spi/atmel-quadspi.c | 535 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 543 insertions(+) create mode 100644 drivers/spi/atmel-quadspi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 2830f765877b..deb48e41568f 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -49,6 +49,13 @@ config ATH79_SPI uses driver model and requires a device tree binding to operate. please refer to doc/device-tree-bindings/spi/spi-ath79.txt.
+config ATMEL_QSPI + bool "Atmel QSPI driver" + depends on ARCH_AT91 + help + Enable the Ateml Quad-SPI (QSPI) driver. This driver can only be + used to access SPI NOR flashes. + config ATMEL_SPI bool "Atmel SPI driver" default y if ARCH_AT91 diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 8be9a4baa244..32b42d18b1af 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -18,6 +18,7 @@ endif
obj-$(CONFIG_ALTERA_SPI) += altera_spi.o obj-$(CONFIG_ATH79_SPI) += ath79_spi.o +obj-$(CONFIG_ATMEL_QSPI) += atmel-quadspi.o obj-$(CONFIG_ATMEL_SPI) += atmel_spi.o obj-$(CONFIG_BCM63XX_HSSPI) += bcm63xx_hsspi.o obj-$(CONFIG_BCM63XX_SPI) += bcm63xx_spi.o diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c new file mode 100644 index 000000000000..c54fbe6bc6cf --- /dev/null +++ b/drivers/spi/atmel-quadspi.c @@ -0,0 +1,535 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Atmel QSPI Controller + * + * Copyright (C) 2015 Atmel Corporation + * Copyright (C) 2018 Cryptera A/S + * + * Author: Cyrille Pitchen cyrille.pitchen@atmel.com + * Author: Piotr Bugalski bugalski.piotr@gmail.com + */ + +#include <asm/io.h> +#include <clk.h> +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <fdtdec.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/ioport.h> +#include <mach/clk.h> +#include <spi.h> +#include <spi-mem.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_WICR 0x0034 /* Write Instruction Code Register */ +#define QSPI_IFR 0x0038 /* Instruction Frame Register */ +#define QSPI_RICR 0x003C /* Read Instruction Code 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_SMM 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 (Read/Write 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_MEM BIT(12) +#define QSPI_IFR_SAMA5D2_WRITE_TRSFR BIT(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) +#define QSPI_IFR_APBTFRTYP_READ BIT(24) /* Defined in SAM9X60 */ + +/* 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_caps { + bool has_qspick; + bool has_ricr; +}; + +struct atmel_qspi { + void __iomem *regs; + void __iomem *mem; + struct platform_device *pdev; + const struct atmel_qspi_caps *caps; + ulong bus_clk_rate; + u32 mr; +}; + +struct atmel_qspi_mode { + u8 cmd_buswidth; + u8 addr_buswidth; + u8 data_buswidth; + u32 config; +}; + +static const struct atmel_qspi_mode atmel_qspi_modes[] = { + { 1, 1, 1, QSPI_IFR_WIDTH_SINGLE_BIT_SPI }, + { 1, 1, 2, QSPI_IFR_WIDTH_DUAL_OUTPUT }, + { 1, 1, 4, QSPI_IFR_WIDTH_QUAD_OUTPUT }, + { 1, 2, 2, QSPI_IFR_WIDTH_DUAL_IO }, + { 1, 4, 4, QSPI_IFR_WIDTH_QUAD_IO }, + { 2, 2, 2, QSPI_IFR_WIDTH_DUAL_CMD }, + { 4, 4, 4, QSPI_IFR_WIDTH_QUAD_CMD }, +}; + +static inline bool atmel_qspi_is_compatible(const struct spi_mem_op *op, + const struct atmel_qspi_mode *mode) +{ + if (op->cmd.buswidth != mode->cmd_buswidth) + return false; + + if (op->addr.nbytes && op->addr.buswidth != mode->addr_buswidth) + return false; + + if (op->data.nbytes && op->data.buswidth != mode->data_buswidth) + return false; + + return true; +} + +static int atmel_qspi_find_mode(const struct spi_mem_op *op) +{ + u32 i; + + for (i = 0; i < ARRAY_SIZE(atmel_qspi_modes); i++) + if (atmel_qspi_is_compatible(op, &atmel_qspi_modes[i])) + return i; + + return -ENOTSUPP; +} + +static bool atmel_qspi_supports_op(struct spi_slave *slave, + const struct spi_mem_op *op) +{ + if (atmel_qspi_find_mode(op) < 0) + return false; + + /* special case not supported by hardware */ + if (op->addr.nbytes == 2 && op->cmd.buswidth != op->addr.buswidth && + op->dummy.nbytes == 0) + return false; + + return true; +} + +static int atmel_qspi_set_cfg(struct atmel_qspi *aq, + const struct spi_mem_op *op, u32 *offset) +{ + u32 iar, icr, ifr; + u32 dummy_cycles = 0; + int mode; + + iar = 0; + icr = QSPI_ICR_INST(op->cmd.opcode); + ifr = QSPI_IFR_INSTEN; + + mode = atmel_qspi_find_mode(op); + if (mode < 0) + return mode; + ifr |= atmel_qspi_modes[mode].config; + + if (op->dummy.buswidth && op->dummy.nbytes) + dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth; + + /* + * The controller allows 24 and 32-bit addressing while NAND-flash + * requires 16-bit long. Handling 8-bit long addresses is done using + * the option field. For the 16-bit addresses, the workaround depends + * of the number of requested dummy bits. If there are 8 or more dummy + * cycles, the address is shifted and sent with the first dummy byte. + * Otherwise opcode is disabled and the first byte of the address + * contains the command opcode (works only if the opcode and address + * use the same buswidth). The limitation is when the 16-bit address is + * used without enough dummy cycles and the opcode is using a different + * buswidth than the address. + */ + if (op->addr.buswidth) { + switch (op->addr.nbytes) { + case 0: + break; + case 1: + ifr |= QSPI_IFR_OPTEN | QSPI_IFR_OPTL_8BIT; + icr |= QSPI_ICR_OPT(op->addr.val & 0xff); + break; + case 2: + if (dummy_cycles < 8 / op->addr.buswidth) { + ifr &= ~QSPI_IFR_INSTEN; + ifr |= QSPI_IFR_ADDREN; + iar = (op->cmd.opcode << 16) | + (op->addr.val & 0xffff); + } else { + ifr |= QSPI_IFR_ADDREN; + iar = (op->addr.val << 8) & 0xffffff; + dummy_cycles -= 8 / op->addr.buswidth; + } + break; + case 3: + ifr |= QSPI_IFR_ADDREN; + iar = op->addr.val & 0xffffff; + break; + case 4: + ifr |= QSPI_IFR_ADDREN | QSPI_IFR_ADDRL; + iar = op->addr.val & 0x7ffffff; + break; + default: + return -ENOTSUPP; + } + } + + /* offset of the data access in the QSPI memory space */ + *offset = iar; + + /* Set number of dummy cycles */ + if (dummy_cycles) + ifr |= QSPI_IFR_NBDUM(dummy_cycles); + + /* Set data enable */ + if (op->data.nbytes) + ifr |= QSPI_IFR_DATAEN; + + /* + * If the QSPI controller is set in regular SPI mode, set it in + * Serial Memory Mode (SMM). + */ + if (aq->mr != QSPI_MR_SMM) { + writel(QSPI_MR_SMM, aq->regs + QSPI_MR); + aq->mr = QSPI_MR_SMM; + } + + /* Clear pending interrupts */ + (void)readl(aq->regs + QSPI_SR); + + if (aq->caps->has_ricr) { + if (!op->addr.nbytes && op->data.dir == SPI_MEM_DATA_IN) + ifr |= QSPI_IFR_APBTFRTYP_READ; + + /* Set QSPI Instruction Frame registers */ + writel(iar, aq->regs + QSPI_IAR); + if (op->data.dir == SPI_MEM_DATA_IN) + writel(icr, aq->regs + QSPI_RICR); + else + writel(icr, aq->regs + QSPI_WICR); + writel(ifr, aq->regs + QSPI_IFR); + } else { + if (op->data.dir == SPI_MEM_DATA_OUT) + ifr |= QSPI_IFR_SAMA5D2_WRITE_TRSFR; + + /* Set QSPI Instruction Frame registers */ + writel(iar, aq->regs + QSPI_IAR); + writel(icr, aq->regs + QSPI_ICR); + writel(ifr, aq->regs + QSPI_IFR); + } + + return 0; +} + +static int atmel_qspi_exec_op(struct spi_slave *slave, + const struct spi_mem_op *op) +{ + struct atmel_qspi *aq = dev_get_priv(slave->dev->parent); + u32 sr, imr, offset; + int err; + + err = atmel_qspi_set_cfg(aq, op, &offset); + if (err) + return err; + + /* Skip to the final steps if there is no data */ + if (op->data.nbytes) { + /* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */ + (void)readl(aq->regs + QSPI_IFR); + + /* Send/Receive data */ + if (op->data.dir == SPI_MEM_DATA_IN) + memcpy_fromio(op->data.buf.in, aq->mem + offset, + op->data.nbytes); + else + memcpy_toio(aq->mem + offset, op->data.buf.out, + op->data.nbytes); + + /* Release the chip-select */ + writel(QSPI_CR_LASTXFER, aq->regs + QSPI_CR); + } + + /* Poll INSTruction End and Chip Select Rise flags. */ + imr = QSPI_SR_INSTRE | QSPI_SR_CSR; + return readl_poll_timeout(aq->regs + QSPI_SR, sr, (sr & imr) == imr, + 1000000); +} + +static int atmel_qspi_set_speed(struct udevice *bus, uint hz) +{ + struct atmel_qspi *aq = dev_get_priv(bus); + u32 scr, scbr, mask, new_value; + + /* Compute the QSPI baudrate */ + scbr = DIV_ROUND_UP(aq->bus_clk_rate, hz); + if (scbr > 0) + scbr--; + + new_value = QSPI_SCR_SCBR(scbr); + mask = QSPI_SCR_SCBR_MASK; + + scr = readl(aq->regs + QSPI_SCR); + if ((scr & mask) == new_value) + return 0; + + scr = (scr & ~mask) | new_value; + writel(scr, aq->regs + QSPI_SCR); + + return 0; +} + +static int atmel_qspi_set_mode(struct udevice *bus, uint mode) +{ + struct atmel_qspi *aq = dev_get_priv(bus); + u32 scr, mask, new_value = 0; + + if (mode & SPI_CPOL) + new_value = QSPI_SCR_CPOL; + if (mode & SPI_CPHA) + new_value = QSPI_SCR_CPHA; + + mask = QSPI_SCR_CPOL | QSPI_SCR_CPHA; + + scr = readl(aq->regs + QSPI_SCR); + if ((scr & mask) == new_value) + return 0; + + scr = (scr & ~mask) | new_value; + writel(scr, aq->regs + QSPI_SCR); + + return 0; +} + +static int atmel_qspi_enable_clk(struct udevice *dev) +{ + struct atmel_qspi *aq = dev_get_priv(dev); + struct clk pclk, qspick; + int ret; + + ret = clk_get_by_name(dev, "pclk", &pclk); + if (ret) + ret = clk_get_by_index(dev, 0, &pclk); + + if (ret) { + dev_err(dev, "Missing QSPI peripheral clock\n"); + return ret; + } + + ret = clk_enable(&pclk); + if (ret) { + dev_err(dev, "Failed to enable QSPI peripheral clock\n"); + goto free_pclk; + } + + if (aq->caps->has_qspick) { + /* Get the QSPI system clock */ + ret = clk_get_by_name(dev, "qspick", &qspick); + if (ret) { + dev_err(dev, "Missing QSPI peripheral clock\n"); + goto free_pclk; + } + + ret = clk_enable(&qspick); + if (ret) + dev_err(dev, "Failed to enable QSPI system clock\n"); + clk_free(&qspick); + } + + aq->bus_clk_rate = clk_get_rate(&pclk); + if (!aq->bus_clk_rate) + ret = -EINVAL; + +free_pclk: + clk_free(&pclk); + + return ret; +} + +static void atmel_qspi_init(struct atmel_qspi *aq) +{ + /* Reset the QSPI controller */ + writel(QSPI_CR_SWRST, aq->regs + QSPI_CR); + + /* Set the QSPI controller by default in Serial Memory Mode */ + writel(QSPI_MR_SMM, aq->regs + QSPI_MR); + aq->mr = QSPI_MR_SMM; + + /* Enable the QSPI controller */ + writel(QSPI_CR_QSPIEN, aq->regs + QSPI_CR); +} + +static int atmel_qspi_probe(struct udevice *dev) +{ + struct atmel_qspi *aq = dev_get_priv(dev); + struct resource res; + int ret; + + aq->caps = (struct atmel_qspi_caps *)dev_get_driver_data(dev); + if (!aq->caps) { + dev_err(dev, "Could not retrieve QSPI caps\n"); + return -EINVAL; + }; + + /* Map the registers */ + ret = dev_read_resource_byname(dev, "qspi_base", &res); + if (ret) { + dev_err(dev, "missing registers\n"); + return ret; + } + aq->regs = devm_ioremap(dev, res.start, resource_size(&res)); + if (IS_ERR(aq->regs)) + return PTR_ERR(aq->regs); + + /* Map the AHB memory */ + ret = dev_read_resource_byname(dev, "qspi_mmap", &res); + if (ret) { + dev_err(dev, "missing AHB memory\n"); + return ret; + } + aq->mem = devm_ioremap(dev, res.start, resource_size(&res)); + if (IS_ERR(aq->mem)) + return PTR_ERR(aq->mem); + + ret = atmel_qspi_enable_clk(dev); + if (ret) + return ret; + + atmel_qspi_init(aq); + + return 0; +} + +static const struct spi_controller_mem_ops atmel_qspi_mem_ops = { + .supports_op = atmel_qspi_supports_op, + .exec_op = atmel_qspi_exec_op, +}; + +static const struct dm_spi_ops atmel_qspi_ops = { + .set_speed = atmel_qspi_set_speed, + .set_mode = atmel_qspi_set_mode, + .mem_ops = &atmel_qspi_mem_ops, +}; + +static const struct atmel_qspi_caps atmel_sama5d2_qspi_caps = {}; + +static const struct atmel_qspi_caps atmel_sam9x60_qspi_caps = { + .has_qspick = true, + .has_ricr = true, +}; + +static const struct udevice_id atmel_qspi_ids[] = { + { + .compatible = "atmel,sama5d2-qspi", + .data = (ulong)&atmel_sama5d2_qspi_caps, + }, + { + .compatible = "microchip,sam9x60-qspi", + .data = (ulong)&atmel_sam9x60_qspi_caps, + }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(atmel_qspi) = { + .name = "atmel_qspi", + .id = UCLASS_SPI, + .of_match = atmel_qspi_ids, + .ops = &atmel_qspi_ops, + .priv_auto_alloc_size = sizeof(struct atmel_qspi), + .probe = atmel_qspi_probe, +};