On Thu, May 28, 2015 at 9:32 AM, Brian Norris <computersforpeace@xxxxxxxxx> wrote: > Hi Nga, > > Sorry for some delay here. This driver is mostly pretty good, and I > think only a few very small tweaks are needed. > > (BTW, Rafal already made a few tiny comments, and I didn't see a follow > up that fixes any of them.) Thanks Brian for your reply. I will make the modification needed. Because Rafal commented on this v3 and i want to wait for your comments too, so that will be applied in coming v4. > > On Mon, Mar 16, 2015 at 01:16:22AM -0700, vndao@xxxxxxxxxx wrote: >> From: VIET NGA DAO <vndao@xxxxxxxxxx> >> >> Altera Quad SPI Controller is a soft IP which enables access to Altera EPCQ and >> EPCS flash chips. This patch adds driver for these devices. >> >> Signed-off-by: VIET NGA DAO <vndao@xxxxxxxxxx> >> >> --- >> v3: >> - Change altera_epcq driver name to altera_quadspi for more generic name >> - Implement flash name searching in altera_quadspi.c instead of spi-nor >> - Edit the altra quadspi info table in spi-nor >> - Remove wait_til_ready in all read,write, erase, lock, unlock functions >> - Merge .h and .c into 1 file >> >> v2: >> - Change to spi_nor structure >> - Add lock and unlock functions for spi_nor >> - Simplify the altera_epcq_lock function >> - Replace reg by compatible in device tree >> --- >> .../devicetree/bindings/mtd/altera_quadspi.txt | 45 ++ >> drivers/mtd/spi-nor/Kconfig | 8 + >> drivers/mtd/spi-nor/Makefile | 1 + >> drivers/mtd/spi-nor/altera_quadspi.c | 608 +++++++++++++++++++++ >> drivers/mtd/spi-nor/spi-nor.c | 11 + >> 5 files changed, 673 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/mtd/altera_quadspi.txt >> create mode 100644 drivers/mtd/spi-nor/altera_quadspi.c >> >> diff --git a/Documentation/devicetree/bindings/mtd/altera_quadspi.txt b/Documentation/devicetree/bindings/mtd/altera_quadspi.txt >> new file mode 100644 >> index 0000000..f5bdd35 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/mtd/altera_quadspi.txt >> @@ -0,0 +1,45 @@ >> +* MTD Altera QUADSPI driver >> + >> +Required properties: >> +- compatible: Should be "altr,quadspi-1.0" >> +- reg: Address and length of the register set for the device. It contains >> + the information of registers in the same order as described by reg-names >> +- reg-names: Should contain the reg names >> + "csr_base": Should contain the register configuration base address >> + "data_base": Should contain the data base address >> +- is-epcs: boolean type. >> + If present, the device contains EPCS flashes. >> + Otherwise, it contains EPCQ flashes. > > Is this a property of the controller, or the flash? Seems like it should > be in the subnode(s). > >> +- #address-cells: Must be <1>. >> +- #size-cells: Must be <0>. >> +- flash device tree subnode, there must be a node with the following fields: >> + - compatible: Should contain the flash name > > You should list the names here. > >> + - #address-cells: please refer to /mtd/partition.txt >> + - #size-cells: please refer to /mtd/partition.txt >> + For partitions inside each flash, please refer to /mtd/partition.txt >> + >> +Example: >> + >> + quadspi_controller_0: quadspi@0x000000000 { >> + compatible = "altr,quadspi-1.0"; >> + reg = <0x00000001 0x00000000 0x00000020>, >> + <0x00000000 0x00000000 0x02000000>; >> + reg-names = "csr_base", "data_base"; >> + #address-cells = <1>; >> + #size-cells = <0>; >> + flash0: epcq256@0 { >> + compatible = "epcq256-nonjedec"; > > I don't think the "-nonjedec" part is necessary; it's not really > relevant to the binding, and it probably isn't even necessary for the ID > table in spi-nor.c. Just stick with names like "altr,epcq256". But you > probably should include the "altr," prefix. That will still work fine > with the modalias stuff. > >> + #address-cells = <1>; >> + #size-cells = <1>; >> + partition@0 { >> + /* 16 MB for raw data. */ >> + label = "EPCQ Flash 0 raw data"; >> + reg = <0x0 0x1000000>; >> + }; >> + partition@1000000 { >> + /* 16 MB for jffs2 data. */ >> + label = "EPCQ Flash 0 JFFS 2"; >> + reg = <0x1000000 0x1000000>; >> + }; >> + }; >> + }; //end quadspi@0x000000000 (quadspi_controller_0) >> diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig >> index 64a4f0e..b9eed6d 100644 >> --- a/drivers/mtd/spi-nor/Kconfig >> +++ b/drivers/mtd/spi-nor/Kconfig >> @@ -28,4 +28,12 @@ config SPI_FSL_QUADSPI >> This enables support for the Quad SPI controller in master mode. >> We only connect the NOR to this controller now. >> >> +config SPI_ALTERA_QUADSPI >> + tristate "Support Altera EPCQ/EPCS Flash chips" >> + depends on OF >> + help >> + This enables access to Altera EPCQ/EPCS flash chips, used for data >> + storage. See the driver source for the current list, >> + or to add other chips. >> + >> endif # MTD_SPI_NOR >> diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile >> index 6a7ce14..1a36a72 100644 >> --- a/drivers/mtd/spi-nor/Makefile >> +++ b/drivers/mtd/spi-nor/Makefile >> @@ -1,2 +1,3 @@ >> obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o >> obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o >> +obj-$(CONFIG_SPI_ALTERA_QUADSPI) += altera_quadspi.o >> diff --git a/drivers/mtd/spi-nor/altera_quadspi.c b/drivers/mtd/spi-nor/altera_quadspi.c > > Probably just use hyphens ("-") in the file name, not underscores ("_") > to match the other files in that dir. > >> new file mode 100644 >> index 0000000..1d178d9 >> --- /dev/null >> +++ b/drivers/mtd/spi-nor/altera_quadspi.c >> @@ -0,0 +1,608 @@ >> +/* >> + * Copyright (C) 2014 Altera Corporation. All rights reserved >> + * >> + * This program is free software; you can redistribute it and/or modify it >> + * under the terms and conditions of the GNU General Public License, >> + * version 2, as published by the Free Software Foundation. >> + * >> + * This program is distributed in the hope 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/>. >> + */ >> + >> +#include <linux/clk.h> >> +#include <linux/delay.h> >> +#include <linux/device.h> >> +#include <linux/err.h> >> +#include <linux/errno.h> >> +#include <linux/interrupt.h> >> +#include <linux/io.h> >> +#include <linux/ioport.h> >> +#include <linux/jiffies.h> >> +#include <linux/kernel.h> >> +#include <linux/log2.h> >> +#include <linux/module.h> >> +#include <linux/mod_devicetable.h> >> +#include <linux/mtd/mtd.h> >> +#include <linux/mtd/partitions.h> >> +#include <linux/mtd/spi-nor.h> >> +#include <linux/mutex.h> >> +#include <linux/of.h> >> +#include <linux/of_address.h> >> +#include <linux/platform_device.h> >> +#include <linux/sched.h> >> + >> +#define ALTERA_QUADSPI_RESOURCE_NAME "altera_quadspi" >> + >> +/* max possible slots for serial flash chip in the QUADSPI controller */ >> +#define MAX_NUM_FLASH_CHIP 3 >> +#define EPCS_OPCODE_ID 1 >> +#define EPCQ_OPCODE_ID 2 >> +#define WRITE_CHECK 1 >> +#define ERASE_CHECK 0 >> + >> +/* Define max times to check status register before we give up. */ >> +#define QUADSPI_MAX_TIME_OUT (40 * HZ) >> + >> +/* defines for status register */ >> +#define QUADSPI_SR_REG 0x0 >> +#define QUADSPI_SR_WIP_MASK 0x00000001 >> +#define QUADSPI_SR_WIP 0x1 >> +#define QUADSPI_SR_WEL 0x2 >> +#define QUADSPI_SR_BP0 0x4 >> +#define QUADSPI_SR_BP1 0x8 >> +#define QUADSPI_SR_BP2 0x10 >> +#define QUADSPI_SR_BP3 0x40 >> +#define QUADSPI_SR_TB 0x20 >> +#define QUADSPI_SR_MASK 0x0000000F >> + >> +/* defines for device id register */ >> +#define QUADSPI_SID_REG 0x4 >> +#define QUADSPI_RDID_REG 0x8 >> +#define QUADSPI_ID_MASK 0x000000FF >> + >> +/* >> + * QUADSPI_MEM_OP register offset >> + * >> + * The QUADSPI_MEM_OP register is used to do memory protect and erase operations >> + * >> + */ >> +#define QUADSPI_MEM_OP_REG 0xC >> + >> +#define QUADSPI_MEM_OP_CMD_MASK 0x00000003 >> +#define QUADSPI_MEM_OP_BULK_ERASE_CMD 0x00000001 >> +#define QUADSPI_MEM_OP_SECTOR_ERASE_CMD 0x00000002 >> +#define QUADSPI_MEM_OP_SECTOR_PROTECT_CMD 0x00000003 >> +#define QUADSPI_MEM_OP_SECTOR_VALUE_MASK 0x0003FF00 >> +#define QUADSPI_MEM_OP_SECTOR_PROTECT_VALUE_MASK 0x00001F00 >> +#define QUADSPI_MEM_OP_SECTOR_PROTECT_SHIFT 8 >> +/* >> + * QUADSPI_ISR register offset >> + * >> + * The QUADSPI_ISR register is used to determine whether an invalid write or >> + * erase operation trigerred an interrupt >> + * >> + */ >> +#define QUADSPI_ISR_REG 0x10 >> + >> +#define QUADSPI_ISR_ILLEGAL_ERASE_MASK 0x00000001 >> +#define QUADSPI_ISR_ILLEGAL_WRITE_MASK 0x00000002 >> + >> +/* >> + * QUADSPI_IMR register offset >> + * >> + * The QUADSPI_IMR register is used to mask the invalid erase or the invalid >> + * write interrupts. >> + * >> + */ >> +#define QUADSPI_IMR_REG 0x14 >> +#define QUADSPI_IMR_ILLEGAL_ERASE_MASK 0x00000001 >> + >> +#define QUADSPI_IMR_ILLEGAL_WRITE_MASK 0x00000002 >> + >> +#define QUADSPI_CHIP_SELECT_REG 0x18 >> +#define QUADSPI_CHIP_SELECT_MASK 0x00000007 >> +#define QUADSPI_CHIP_SELECT_0 0x00000001 >> +#define QUADSPI_CHIP_SELECT_1 0x00000002 >> +#define QUADSPI_CHIP_SELECT_2 0x00000004 >> + >> +struct altera_quadspi_plat { >> + void __iomem *csr_base; >> + void __iomem *data_base; >> + bool is_epcs; >> + u32 num_flashes; >> + struct device_node *np[MAX_NUM_FLASH_CHIP]; >> +}; >> + >> +struct altera_quadspi { >> + struct clk *clk; >> + bool is_epcs; >> + void __iomem *csr_base; >> + void __iomem *data_base; >> + u32 num_flashes; >> + struct altera_quadspi_flash *flash[MAX_NUM_FLASH_CHIP]; >> +}; >> + >> +struct altera_quadspi_flash { >> + struct mtd_info mtd; >> + struct spi_nor nor; >> + void *priv; > > Does this really need to be 'void *'? Looks like it should be 'struct > altera_quadspi *'. > >> +}; >> + >> +struct flash_device { >> + char *name; >> + u8 opcode_id; >> + u32 device_id; >> +}; >> + >> +#define FLASH_ID(_n, _opcode_id, _id) \ >> +{ \ >> + .name = (_n), \ >> + .opcode_id = (_opcode_id), \ >> + .device_id = (_id), \ >> +} >> + >> +static struct flash_device flash_devices[] = { >> + FLASH_ID("epcq16-nonjedec", 2, 0x15), >> + FLASH_ID("epcq32-nonjedec", 2, 0x16), >> + FLASH_ID("epcq64-nonjedec", 2, 0x17), >> + FLASH_ID("epcq128-nonjedec", 2, 0x18), >> + FLASH_ID("epcq256-nonjedec", 2, 0x19), >> + FLASH_ID("epcq512-nonjedec", 2, 0x20), >> + >> + FLASH_ID("epcs16-nonjedec", 1, 0x14), >> + FLASH_ID("epcs64-nonjedec", 1, 0x16), >> + FLASH_ID("epcs128-nonjedec", 1, 0x18), > > Rafal commented on this block, about *_OPCODE_ID. > >> +}; >> + >> +static int altera_quadspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *val, >> + int len, int wr_en) >> +{ >> + return 0; >> +} >> + >> +static int altera_quadspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *val, >> + int len) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + u32 data = 0; >> + >> + switch (opcode) { >> + case SPINOR_OP_RDSR: >> + data = readl(dev->csr_base + QUADSPI_SR_REG); >> + *val = (u8)data & QUADSPI_SR_MASK; >> + break; >> + case SPINOR_OP_RDID: >> + /* opcode id */ >> + if (dev->is_epcs) >> + data = readl(dev->csr_base + QUADSPI_SID_REG); >> + else >> + data = readl(dev->csr_base + QUADSPI_RDID_REG); >> + >> + *val = (u8)data & QUADSPI_ID_MASK; /* device id */ >> + break; >> + default: >> + *val = 0; >> + break; > > Zero out the rest of val, since you're only filling the first byte? > >> + } >> + return 0; >> +} >> + >> +static int altera_quadspi_write_erase_check(struct spi_nor *nor, >> + bool write_erase) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + u32 val; >> + u32 mask; >> + >> + if (write_erase) >> + mask = QUADSPI_ISR_ILLEGAL_WRITE_MASK; >> + else >> + mask = QUADSPI_ISR_ILLEGAL_ERASE_MASK; >> + >> + val = readl(dev->csr_base + QUADSPI_ISR_REG); >> + if (val & mask) { >> + dev_err(nor->dev, >> + "write/erase failed, sector might be protected\n"); >> + /* clear this status for next use */ >> + writel(val, dev->csr_base + QUADSPI_ISR_REG); >> + return -EIO; >> + } >> + return 0; >> +} >> + >> +static int altera_quadspi_addr_to_sector(struct mtd_info *mtd, int offset) >> +{ >> + if (mtd->erasesize_shift) >> + return offset >> mtd->erasesize_shift; >> + do_div(offset, mtd->erasesize); >> + return offset; >> +} >> + >> +static int altera_quadspi_erase(struct spi_nor *nor, loff_t offset) >> +{ >> + >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + struct mtd_info *mtd = &flash->mtd; >> + u32 val; >> + int ret; >> + int sector_value; >> + >> + sector_value = altera_quadspi_addr_to_sector(mtd, offset); >> + /* sanity check that block_offset is a valid sector number */ >> + if (sector_value < 0) >> + return -EINVAL; >> + >> + /* sector value should occupy bits 17:8 */ >> + val = (sector_value << 8) & QUADSPI_MEM_OP_SECTOR_VALUE_MASK; >> + >> + /* sector erase commands occupies lower 2 bits */ >> + val |= QUADSPI_MEM_OP_SECTOR_ERASE_CMD; >> + >> + /* write sector erase command to QUADSPI_MEM_OP register */ >> + writel(val, dev->csr_base + QUADSPI_MEM_OP_REG); >> + >> + ret = altera_quadspi_write_erase_check(nor, ERASE_CHECK); >> + if (ret < 0) { >> + dev_err(nor->dev, "illegal erase\n"); >> + return ret; >> + } >> + return 0; >> +} >> + >> +static int altera_quadspi_read(struct spi_nor *nor, loff_t from, size_t len, >> + size_t *retlen, u_char *buf) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + >> + memcpy_fromio(buf, dev->data_base + from, len); >> + *retlen = len; >> + >> + return 0; >> +} >> + >> +static void altera_quadspi_write(struct spi_nor *nor, loff_t to, size_t len, >> + size_t *retlen, const u_char *buf) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + int ret = 0; >> + >> + memcpy_toio(dev->data_base + to, buf, len); >> + *retlen += len; >> + >> + /* >> + * check whether write triggered a illegal write interrupt >> + */ >> + >> + ret = altera_quadspi_write_erase_check(nor, WRITE_CHECK); >> + if (ret < 0) >> + dev_err(nor->dev, "illegal write\n"); >> + >> + >> +} >> + >> +static int altera_quadspi_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + struct mtd_info *mtd = &flash->mtd; >> + uint32_t offset = ofs; >> + u32 sector_start, sector_end; >> + u32 num_sectors; >> + u32 mem_op; >> + u32 sr_bp; >> + u32 sr_tb; >> + >> + sector_start = offset; >> + sector_end = altera_quadspi_addr_to_sector(mtd, offset + len); >> + num_sectors = mtd->size; >> + do_div(num_sectors, mtd->erasesize); >> + >> + dev_dbg(nor->dev, "%s: sector start is %u,sector end is %u\n", >> + __func__, sector_start, sector_end); >> + >> + if (sector_start >= num_sectors / 2) { >> + sr_bp = fls(num_sectors - 1 - sector_start) + 1; >> + sr_tb = 0; >> + } else if ((sector_end < num_sectors / 2) && ~dev->is_epcs) { >> + sr_bp = fls(sector_end) + 1; >> + sr_tb = 1; >> + } else { >> + sr_bp = 16; >> + sr_tb = 0; >> + } >> + >> + mem_op = (sr_tb << 12) | (sr_bp << 8); >> + mem_op &= QUADSPI_MEM_OP_SECTOR_PROTECT_VALUE_MASK; >> + mem_op |= QUADSPI_MEM_OP_SECTOR_PROTECT_CMD; >> + writel(mem_op, dev->csr_base + QUADSPI_MEM_OP_REG); >> + >> + return 0; >> +} >> + >> +static int altera_quadspi_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + u32 mem_op; >> + >> + dev_dbg(nor->dev, "Unlock all protected area\n"); >> + mem_op = 0; >> + mem_op &= QUADSPI_MEM_OP_SECTOR_PROTECT_VALUE_MASK; >> + mem_op |= QUADSPI_MEM_OP_SECTOR_PROTECT_CMD; > > Can't the above 3 lines just be: > > mem_op = QUADSPI_MEM_OP_SECTOR_PROTECT_CMD; > > ? > >> + writel(mem_op, dev->csr_base + QUADSPI_MEM_OP_REG); >> + >> + return 0; >> +} >> + >> +static void altera_quadspi_chip_select(struct altera_quadspi *dev, u32 bank) >> +{ >> + u32 val = 0; >> + >> + switch (bank) { >> + case 0: >> + val = QUADSPI_CHIP_SELECT_0; >> + break; >> + case 1: >> + val = QUADSPI_CHIP_SELECT_1; >> + break; >> + case 2: >> + val = QUADSPI_CHIP_SELECT_2; >> + break; >> + default: >> + return; >> + } >> + writel(val, dev->csr_base + QUADSPI_CHIP_SELECT_REG); >> +} >> + >> + >> +static int altera_quadspi_probe_config_dt(struct platform_device *pdev, >> + struct device_node *np, >> + struct altera_quadspi_plat *pdata) >> +{ >> + struct device_node *pp = NULL; > > ^^ Is the NULL assignment necessary? > >> + struct resource *quadspi_res; >> + int i = 0; >> + >> + pdata->is_epcs = of_property_read_bool(np, "is-epcs"); >> + >> + quadspi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, >> + "csr_base"); >> + pdata->csr_base = devm_ioremap_resource(&pdev->dev, quadspi_res); >> + if (IS_ERR(pdata->csr_base)) { >> + dev_err(&pdev->dev, "%s: ERROR: failed to map csr base\n", >> + __func__); >> + return PTR_ERR(pdata->csr_base); >> + } >> + >> + quadspi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, >> + "data_base"); >> + pdata->data_base = devm_ioremap_resource(&pdev->dev, quadspi_res); >> + if (IS_ERR(pdata->data_base)) { >> + dev_err(&pdev->dev, "%s: ERROR: failed to map data base\n", >> + __func__); >> + return PTR_ERR(pdata->data_base); >> + } >> + >> + /* Fill structs for each subnode (flash device) */ >> + for_each_available_child_of_node(np, pp) { >> + /* Read bank id from DT */ >> + pdata->np[i] = pp; >> + i++; >> + } >> + pdata->num_flashes = i; >> + return 0; >> +} >> + >> +static const char *get_flash_name(struct spi_nor *nor) >> +{ >> + struct altera_quadspi_flash *flash = nor->priv; >> + struct altera_quadspi *dev = flash->priv; >> + int index; >> + int ret; >> + u8 id = 0; >> + u8 opcode_id; >> + >> + opcode_id = dev->is_epcs ? EPCS_OPCODE_ID : EPCQ_OPCODE_ID; >> + ret = nor->read_reg(nor, SPINOR_OP_RDID, &id, 1); >> + if (ret) >> + return NULL; >> + for (index = 0; index < ARRAY_SIZE(flash_devices); index++) { >> + if (flash_devices[index].device_id == id && >> + flash_devices[index].opcode_id == opcode_id) >> + return flash_devices[index].name; >> + } >> + >> + /* Memory chip is not listed and not supported */ >> + return NULL; >> +} >> + >> +static int altera_quadspi_setup_banks(struct platform_device *pdev, >> + u32 bank, struct device_node *np) >> +{ >> + struct altera_quadspi *dev = platform_get_drvdata(pdev); >> + struct mtd_part_parser_data ppdata = {}; >> + struct altera_quadspi_flash *flash; >> + struct spi_nor *nor; >> + int ret = 0; >> + char modalias[40]; >> + const char *flash_name; >> + >> + altera_quadspi_chip_select(dev, bank); >> + >> + if (bank > dev->num_flashes - 1) >> + return -EINVAL; > > Not a big deal, but wouldn't it make sense to put the 'bank > ...' check > before the call to altera_quadspi_chip_select()? > >> + >> + flash = devm_kzalloc(&pdev->dev, sizeof(*flash), GFP_KERNEL); >> + if (!flash) >> + return -ENOMEM; >> + >> + dev->flash[bank] = flash; >> + nor = &flash->nor; >> + nor->mtd = &flash->mtd; >> + nor->dev = &pdev->dev; >> + nor->priv = flash; >> + flash->mtd.priv = nor; >> + flash->priv = dev; >> + >> + /* spi nor framework*/ >> + nor->read_reg = altera_quadspi_read_reg; >> + nor->write_reg = altera_quadspi_write_reg; >> + nor->read = altera_quadspi_read; >> + nor->write = altera_quadspi_write; >> + nor->erase = altera_quadspi_erase; >> + nor->flash_lock = altera_quadspi_lock; >> + nor->flash_unlock = altera_quadspi_unlock; >> + >> + if (of_modalias_node(np, modalias, sizeof(modalias)) < 0) >> + return -EINVAL; >> + >> + flash_name = get_flash_name(nor); >> + if (flash_name == NULL) >> + return -EINVAL; >> + >> + if (strcmp(flash_name, modalias) != 0) { >> + dev_err(nor->dev, >> + "flash name %s mismatch with device tree %s\n", >> + flash_name, modalias); >> + return -EINVAL; >> + } >> + ret = spi_nor_scan(nor, flash_name, SPI_NOR_QUAD); >> + if (ret) >> + return ret; >> + >> + ppdata.of_node = np; >> + >> + return mtd_device_parse_register(&flash->mtd, NULL, &ppdata, NULL, 0); >> +} >> + >> +static int altera_quadspi_probe(struct platform_device *pdev) >> +{ >> + struct device_node *np = pdev->dev.of_node; >> + struct altera_quadspi_plat *pdata = NULL; > > The NULL assignment is superfluous. > >> + struct altera_quadspi *dev; >> + int ret = 0; >> + int i; >> + >> + if (!np) { >> + ret = -ENODEV; >> + dev_err(&pdev->dev, "no device found\n"); >> + goto err; >> + } >> + >> + pdata = devm_kzalloc(&pdev->dev, >> + sizeof(struct altera_quadspi_plat), >> + GFP_KERNEL); > > It's not real clear why you're using this pdata struct at all. Are you > planning to support non-DT platform devices, or is this going to be > DT-only? (The check for "if (!np) { ... }" above looks like you're > DT-only.) > > But anyway, this pdata struct is only used for the duration of the probe > function, after which it is not used. It's true devm_* will take care of > freeing it eventually, but wouldn't it make more sense to just free it > up when you're done? e.g., put it on the stack instead (local variable)? > Or just remove it entirely, and stash things directly into *dev and > *flash. > >> + >> + if (!pdata) { >> + ret = -ENOMEM; >> + goto err; >> + } >> + >> + ret = altera_quadspi_probe_config_dt(pdev, np, pdata); >> + if (ret) { >> + ret = -ENODEV; >> + dev_err(&pdev->dev, "probe fail\n"); >> + goto err; >> + } >> + >> + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); >> + if (!dev) { >> + ret = -ENOMEM; >> + goto err; >> + } >> + >> + dev->is_epcs = pdata->is_epcs; >> + dev->csr_base = pdata->csr_base; >> + dev->data_base = pdata->data_base; >> + >> + /* check number of flashes */ >> + dev->num_flashes = pdata->num_flashes; >> + if (dev->num_flashes > MAX_NUM_FLASH_CHIP) { >> + dev_err(&pdev->dev, "exceeding max number of flashes\n"); >> + dev->num_flashes = MAX_NUM_FLASH_CHIP; >> + } >> + >> + /* check clock */ >> + dev->clk = devm_clk_get(&pdev->dev, NULL); >> + if (IS_ERR(dev->clk)) { >> + ret = PTR_ERR(dev->clk); >> + goto err; >> + } >> + ret = clk_prepare_enable(dev->clk); >> + if (ret) >> + goto err; >> + >> + platform_set_drvdata(pdev, dev); >> + >> + /* loop for each flash which is connected to quadspi */ >> + for (i = 0; i < dev->num_flashes; i++) { >> + ret = altera_quadspi_setup_banks(pdev, i, pdata->np[i]); >> + if (ret) { >> + dev_err(&pdev->dev, "bank setup failed\n"); >> + goto err_bank_setup; >> + } >> + } >> + >> + return 0; >> + >> +err_bank_setup: >> + clk_disable_unprepare(dev->clk); >> +err: >> + return ret; >> +} >> + >> +static int altera_quadspi_remove(struct platform_device *pdev) >> +{ >> + struct altera_quadspi *dev; >> + struct altera_quadspi_flash *flash; >> + int ret, i; >> + >> + dev = platform_get_drvdata(pdev); >> + >> + /* clean up for all nor flash */ >> + for (i = 0; i < dev->num_flashes; i++) { >> + flash = dev->flash[i]; >> + if (!flash) >> + continue; >> + >> + /* clean up mtd stuff */ >> + ret = mtd_device_unregister(&flash->mtd); >> + if (ret) >> + dev_err(&pdev->dev, "error removing mtd\n"); >> + } >> + >> + clk_disable_unprepare(dev->clk); >> + >> + return 0; >> +} >> + >> +static const struct of_device_id altera_quadspi_id_table[] = { >> + { .compatible = "altr,quadspi-1.0" }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, altera_quadspi_id_table); >> + >> +static struct platform_driver altera_quadspi_driver = { >> + .driver = { >> + .name = ALTERA_QUADSPI_RESOURCE_NAME, >> + .bus = &platform_bus_type, > > ^^ You don't need that line. module_platform_driver() (specifically, > __platform_driver_register()) takes care of this for you. > >> + .of_match_table = altera_quadspi_id_table, >> + }, >> + .probe = altera_quadspi_probe, >> + .remove = altera_quadspi_remove, >> +}; >> +module_platform_driver(altera_quadspi_driver); >> + >> +MODULE_AUTHOR("Viet Nga Dao <vndao@xxxxxxxxxx>"); >> +MODULE_DESCRIPTION("Altera QuadSPI Driver"); >> +MODULE_LICENSE("GPL v2"); >> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c >> index 43bb552..ad0c274 100644 >> --- a/drivers/mtd/spi-nor/spi-nor.c >> +++ b/drivers/mtd/spi-nor/spi-nor.c >> @@ -683,6 +683,17 @@ static const struct spi_device_id spi_nor_ids[] = { >> { "cat25c09", CAT25_INFO( 128, 8, 32, 2, SPI_NOR_NO_ERASE | SPI_NOR_NO_FR) }, >> { "cat25c17", CAT25_INFO( 256, 8, 32, 2, SPI_NOR_NO_ERASE | SPI_NOR_NO_FR) }, >> { "cat25128", CAT25_INFO(2048, 8, 64, 2, SPI_NOR_NO_ERASE | SPI_NOR_NO_FR) }, >> + >> + /* Altera EPCQ/EPCS Flashes */ >> + { "epcq16-nonjedec", INFO(0, 0, 0x10000, 32, 0) }, >> + { "epcq32-nonjedec", INFO(0, 0, 0x10000, 64, 0) }, >> + { "epcq64-nonjedec", INFO(0, 0, 0x10000, 128, 0) }, >> + { "epcq128-nonjedec", INFO(0, 0, 0x10000, 256, 0) }, >> + { "epcq256-nonjedec", INFO(0, 0, 0x10000, 512, 0) }, >> + { "epcq512-nonjedec", INFO(0, 0, 0x10000, 1024, 0) }, >> + { "epcs16-nonjedec", INFO(0, 0, 0x10000, 32, 0) }, >> + { "epcs64-nonjedec", INFO(0, 0, 0x10000, 128, 0) }, >> + { "epcs128-nonjedec", INFO(0, 0, 0x40000, 256, 0) }, > > You probably should just drop the "-nonjedec" part. That will help you > have a more sane DT binding. I realize you're imitating the > "m25p80-nonjedec" entries that already exist, but I think those names > exist mostly because there are otherwise-identical version of them that > just don't support the READ ID command. Your parts are unique, and don't > have corresponding JEDEC READ ID compatible versions. > > You could still include a comment above them, to note their origin, and > how they don't support many traditional commands. > >> { }, >> }; >> > > Thanks, > Brian -- Nga -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html