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linux/drivers/spi/spi-mtk-nor.c

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spi: add support for mediatek spi-nor controller This is a driver for mtk spi-nor controller using spi-mem interface. The same controller already has limited support provided by mtk-quadspi driver under spi-nor framework and this new driver is a replacement for the old one. Comparing to the old driver, this driver has following advantages: 1. It can handle any full-duplex spi transfer up to 6 bytes, and this is implemented using generic spi interface. 2. It take account into command opcode properly. The reading routine in this controller can only use 0x03 or 0x0b as opcode on 1-1-1 transfers, but old driver doesn't implement this properly. This driver checks supported opcode explicitly and use (1) to perform unmatched operations. 3. It properly handles SFDP reading. Old driver can't read SFDP due to the bug mentioned in (2). 4. It can do 1-2-2 and 1-4-4 fast reading on spi-nor. These two ops requires parsing SFDP, which isn't possible in old driver. And the old driver is only flagged to support 1-1-2 mode. 5. It takes advantage of the DMA feature in this controller for long reads and supports IRQ on DMA requests to free cpu cycles from polling status registers on long DMA reading. It achieves up to 17.5MB/s reading speed (1-4-4 mode) which is way faster than the old one. IRQ is implemented as optional to maintain backward compatibility. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> Link: https://lore.kernel.org/r/20200306085052.28258-3-gch981213@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-06 11:50:50 +03:00
// SPDX-License-Identifier: GPL-2.0
//
// Mediatek SPI NOR controller driver
//
// Copyright (C) 2020 Chuanhong Guo <gch981213@gmail.com>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
#include <linux/string.h>
#define DRIVER_NAME "mtk-spi-nor"
#define MTK_NOR_REG_CMD 0x00
#define MTK_NOR_CMD_WRITE BIT(4)
#define MTK_NOR_CMD_PROGRAM BIT(2)
#define MTK_NOR_CMD_READ BIT(0)
#define MTK_NOR_CMD_MASK GENMASK(5, 0)
#define MTK_NOR_REG_PRG_CNT 0x04
#define MTK_NOR_REG_RDATA 0x0c
#define MTK_NOR_REG_RADR0 0x10
#define MTK_NOR_REG_RADR(n) (MTK_NOR_REG_RADR0 + 4 * (n))
#define MTK_NOR_REG_RADR3 0xc8
#define MTK_NOR_REG_WDATA 0x1c
#define MTK_NOR_REG_PRGDATA0 0x20
#define MTK_NOR_REG_PRGDATA(n) (MTK_NOR_REG_PRGDATA0 + 4 * (n))
#define MTK_NOR_REG_PRGDATA_MAX 5
#define MTK_NOR_REG_SHIFT0 0x38
#define MTK_NOR_REG_SHIFT(n) (MTK_NOR_REG_SHIFT0 + 4 * (n))
#define MTK_NOR_REG_SHIFT_MAX 9
#define MTK_NOR_REG_CFG1 0x60
#define MTK_NOR_FAST_READ BIT(0)
#define MTK_NOR_REG_CFG2 0x64
#define MTK_NOR_WR_CUSTOM_OP_EN BIT(4)
#define MTK_NOR_WR_BUF_EN BIT(0)
#define MTK_NOR_REG_PP_DATA 0x98
#define MTK_NOR_REG_IRQ_STAT 0xa8
#define MTK_NOR_REG_IRQ_EN 0xac
#define MTK_NOR_IRQ_DMA BIT(7)
#define MTK_NOR_IRQ_MASK GENMASK(7, 0)
#define MTK_NOR_REG_CFG3 0xb4
#define MTK_NOR_DISABLE_WREN BIT(7)
#define MTK_NOR_DISABLE_SR_POLL BIT(5)
#define MTK_NOR_REG_WP 0xc4
#define MTK_NOR_ENABLE_SF_CMD 0x30
#define MTK_NOR_REG_BUSCFG 0xcc
#define MTK_NOR_4B_ADDR BIT(4)
#define MTK_NOR_QUAD_ADDR BIT(3)
#define MTK_NOR_QUAD_READ BIT(2)
#define MTK_NOR_DUAL_ADDR BIT(1)
#define MTK_NOR_DUAL_READ BIT(0)
#define MTK_NOR_BUS_MODE_MASK GENMASK(4, 0)
#define MTK_NOR_REG_DMA_CTL 0x718
#define MTK_NOR_DMA_START BIT(0)
#define MTK_NOR_REG_DMA_FADR 0x71c
#define MTK_NOR_REG_DMA_DADR 0x720
#define MTK_NOR_REG_DMA_END_DADR 0x724
#define MTK_NOR_PRG_MAX_SIZE 6
// Reading DMA src/dst addresses have to be 16-byte aligned
#define MTK_NOR_DMA_ALIGN 16
#define MTK_NOR_DMA_ALIGN_MASK (MTK_NOR_DMA_ALIGN - 1)
// and we allocate a bounce buffer if destination address isn't aligned.
#define MTK_NOR_BOUNCE_BUF_SIZE PAGE_SIZE
// Buffered page program can do one 128-byte transfer
#define MTK_NOR_PP_SIZE 128
#define CLK_TO_US(sp, clkcnt) ((clkcnt) * 1000000 / sp->spi_freq)
struct mtk_nor {
struct spi_controller *ctlr;
struct device *dev;
void __iomem *base;
u8 *buffer;
struct clk *spi_clk;
struct clk *ctlr_clk;
unsigned int spi_freq;
bool wbuf_en;
bool has_irq;
struct completion op_done;
};
static inline void mtk_nor_rmw(struct mtk_nor *sp, u32 reg, u32 set, u32 clr)
{
u32 val = readl(sp->base + reg);
val &= ~clr;
val |= set;
writel(val, sp->base + reg);
}
static inline int mtk_nor_cmd_exec(struct mtk_nor *sp, u32 cmd, ulong clk)
{
ulong delay = CLK_TO_US(sp, clk);
u32 reg;
int ret;
writel(cmd, sp->base + MTK_NOR_REG_CMD);
ret = readl_poll_timeout(sp->base + MTK_NOR_REG_CMD, reg, !(reg & cmd),
delay / 3, (delay + 1) * 200);
if (ret < 0)
dev_err(sp->dev, "command %u timeout.\n", cmd);
return ret;
}
static void mtk_nor_set_addr(struct mtk_nor *sp, const struct spi_mem_op *op)
{
u32 addr = op->addr.val;
int i;
for (i = 0; i < 3; i++) {
writeb(addr & 0xff, sp->base + MTK_NOR_REG_RADR(i));
addr >>= 8;
}
if (op->addr.nbytes == 4) {
writeb(addr & 0xff, sp->base + MTK_NOR_REG_RADR3);
mtk_nor_rmw(sp, MTK_NOR_REG_BUSCFG, MTK_NOR_4B_ADDR, 0);
} else {
mtk_nor_rmw(sp, MTK_NOR_REG_BUSCFG, 0, MTK_NOR_4B_ADDR);
}
}
static bool mtk_nor_match_read(const struct spi_mem_op *op)
{
int dummy = 0;
if (op->dummy.buswidth)
dummy = op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth;
if ((op->data.buswidth == 2) || (op->data.buswidth == 4)) {
if (op->addr.buswidth == 1)
return dummy == 8;
else if (op->addr.buswidth == 2)
return dummy == 4;
else if (op->addr.buswidth == 4)
return dummy == 6;
} else if ((op->addr.buswidth == 1) && (op->data.buswidth == 1)) {
if (op->cmd.opcode == 0x03)
return dummy == 0;
else if (op->cmd.opcode == 0x0b)
return dummy == 8;
}
return false;
}
static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
{
size_t len;
if (!op->data.nbytes)
return 0;
if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
if ((op->data.dir == SPI_MEM_DATA_IN) &&
mtk_nor_match_read(op)) {
if ((op->addr.val & MTK_NOR_DMA_ALIGN_MASK) ||
(op->data.nbytes < MTK_NOR_DMA_ALIGN))
op->data.nbytes = 1;
else if (!((ulong)(op->data.buf.in) &
MTK_NOR_DMA_ALIGN_MASK))
op->data.nbytes &= ~MTK_NOR_DMA_ALIGN_MASK;
else if (op->data.nbytes > MTK_NOR_BOUNCE_BUF_SIZE)
op->data.nbytes = MTK_NOR_BOUNCE_BUF_SIZE;
return 0;
} else if (op->data.dir == SPI_MEM_DATA_OUT) {
if (op->data.nbytes >= MTK_NOR_PP_SIZE)
op->data.nbytes = MTK_NOR_PP_SIZE;
else
op->data.nbytes = 1;
return 0;
}
}
spi: spi-mem: allow specifying a command's extension In xSPI mode, flashes expect 2-byte opcodes. The second byte is called the "command extension". There can be 3 types of extensions in xSPI: repeat, invert, and hex. When the extension type is "repeat", the same opcode is sent twice. When it is "invert", the second byte is the inverse of the opcode. When it is "hex" an additional opcode byte based is sent with the command whose value can be anything. So, make opcode a 16-bit value and add a 'nbytes', similar to how multiple address widths are handled. Some places use sizeof(op->cmd.opcode). Replace them with op->cmd.nbytes The spi-mxic and spi-zynq-qspi drivers directly use op->cmd.opcode as a buffer. Now that opcode is a 2-byte field, this can result in different behaviour depending on if the machine is little endian or big endian. Extract the opcode in a local 1-byte variable and use that as the buffer instead. Both these drivers would reject multi-byte opcodes in their supports_op() hook anyway, so we only need to worry about single-byte opcodes for now. The above two changes are put in this commit to keep the series bisectable. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20200623183030.26591-3-p.yadav@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-06-23 21:30:15 +03:00
len = MTK_NOR_PRG_MAX_SIZE - op->cmd.nbytes - op->addr.nbytes -
spi: add support for mediatek spi-nor controller This is a driver for mtk spi-nor controller using spi-mem interface. The same controller already has limited support provided by mtk-quadspi driver under spi-nor framework and this new driver is a replacement for the old one. Comparing to the old driver, this driver has following advantages: 1. It can handle any full-duplex spi transfer up to 6 bytes, and this is implemented using generic spi interface. 2. It take account into command opcode properly. The reading routine in this controller can only use 0x03 or 0x0b as opcode on 1-1-1 transfers, but old driver doesn't implement this properly. This driver checks supported opcode explicitly and use (1) to perform unmatched operations. 3. It properly handles SFDP reading. Old driver can't read SFDP due to the bug mentioned in (2). 4. It can do 1-2-2 and 1-4-4 fast reading on spi-nor. These two ops requires parsing SFDP, which isn't possible in old driver. And the old driver is only flagged to support 1-1-2 mode. 5. It takes advantage of the DMA feature in this controller for long reads and supports IRQ on DMA requests to free cpu cycles from polling status registers on long DMA reading. It achieves up to 17.5MB/s reading speed (1-4-4 mode) which is way faster than the old one. IRQ is implemented as optional to maintain backward compatibility. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> Link: https://lore.kernel.org/r/20200306085052.28258-3-gch981213@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-06 11:50:50 +03:00
op->dummy.nbytes;
if (op->data.nbytes > len)
op->data.nbytes = len;
return 0;
}
static bool mtk_nor_supports_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
size_t len;
if (op->cmd.buswidth != 1)
return false;
spi: spi-mtk-nor: reject DTR ops Double Transfer Rate (DTR) ops are added in spi-mem. But this controller doesn't support DTR transactions. Since we don't use the default supports_op(), which rejects all DTR ops, do that explicitly in our supports_op(). Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20200623183030.26591-5-p.yadav@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-06-23 21:30:17 +03:00
/* DTR ops not supported. */
if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
return false;
if (op->cmd.nbytes != 1)
return false;
spi: add support for mediatek spi-nor controller This is a driver for mtk spi-nor controller using spi-mem interface. The same controller already has limited support provided by mtk-quadspi driver under spi-nor framework and this new driver is a replacement for the old one. Comparing to the old driver, this driver has following advantages: 1. It can handle any full-duplex spi transfer up to 6 bytes, and this is implemented using generic spi interface. 2. It take account into command opcode properly. The reading routine in this controller can only use 0x03 or 0x0b as opcode on 1-1-1 transfers, but old driver doesn't implement this properly. This driver checks supported opcode explicitly and use (1) to perform unmatched operations. 3. It properly handles SFDP reading. Old driver can't read SFDP due to the bug mentioned in (2). 4. It can do 1-2-2 and 1-4-4 fast reading on spi-nor. These two ops requires parsing SFDP, which isn't possible in old driver. And the old driver is only flagged to support 1-1-2 mode. 5. It takes advantage of the DMA feature in this controller for long reads and supports IRQ on DMA requests to free cpu cycles from polling status registers on long DMA reading. It achieves up to 17.5MB/s reading speed (1-4-4 mode) which is way faster than the old one. IRQ is implemented as optional to maintain backward compatibility. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> Link: https://lore.kernel.org/r/20200306085052.28258-3-gch981213@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-06 11:50:50 +03:00
if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op))
return true;
else if (op->data.dir == SPI_MEM_DATA_OUT)
return (op->addr.buswidth == 1) &&
(op->dummy.buswidth == 0) &&
(op->data.buswidth == 1);
}
spi: spi-mem: allow specifying a command's extension In xSPI mode, flashes expect 2-byte opcodes. The second byte is called the "command extension". There can be 3 types of extensions in xSPI: repeat, invert, and hex. When the extension type is "repeat", the same opcode is sent twice. When it is "invert", the second byte is the inverse of the opcode. When it is "hex" an additional opcode byte based is sent with the command whose value can be anything. So, make opcode a 16-bit value and add a 'nbytes', similar to how multiple address widths are handled. Some places use sizeof(op->cmd.opcode). Replace them with op->cmd.nbytes The spi-mxic and spi-zynq-qspi drivers directly use op->cmd.opcode as a buffer. Now that opcode is a 2-byte field, this can result in different behaviour depending on if the machine is little endian or big endian. Extract the opcode in a local 1-byte variable and use that as the buffer instead. Both these drivers would reject multi-byte opcodes in their supports_op() hook anyway, so we only need to worry about single-byte opcodes for now. The above two changes are put in this commit to keep the series bisectable. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20200623183030.26591-3-p.yadav@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-06-23 21:30:15 +03:00
len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
spi: add support for mediatek spi-nor controller This is a driver for mtk spi-nor controller using spi-mem interface. The same controller already has limited support provided by mtk-quadspi driver under spi-nor framework and this new driver is a replacement for the old one. Comparing to the old driver, this driver has following advantages: 1. It can handle any full-duplex spi transfer up to 6 bytes, and this is implemented using generic spi interface. 2. It take account into command opcode properly. The reading routine in this controller can only use 0x03 or 0x0b as opcode on 1-1-1 transfers, but old driver doesn't implement this properly. This driver checks supported opcode explicitly and use (1) to perform unmatched operations. 3. It properly handles SFDP reading. Old driver can't read SFDP due to the bug mentioned in (2). 4. It can do 1-2-2 and 1-4-4 fast reading on spi-nor. These two ops requires parsing SFDP, which isn't possible in old driver. And the old driver is only flagged to support 1-1-2 mode. 5. It takes advantage of the DMA feature in this controller for long reads and supports IRQ on DMA requests to free cpu cycles from polling status registers on long DMA reading. It achieves up to 17.5MB/s reading speed (1-4-4 mode) which is way faster than the old one. IRQ is implemented as optional to maintain backward compatibility. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> Link: https://lore.kernel.org/r/20200306085052.28258-3-gch981213@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-06 11:50:50 +03:00
if ((len > MTK_NOR_PRG_MAX_SIZE) ||
((op->data.nbytes) && (len == MTK_NOR_PRG_MAX_SIZE)))
return false;
return true;
}
static void mtk_nor_setup_bus(struct mtk_nor *sp, const struct spi_mem_op *op)
{
u32 reg = 0;
if (op->addr.nbytes == 4)
reg |= MTK_NOR_4B_ADDR;
if (op->data.buswidth == 4) {
reg |= MTK_NOR_QUAD_READ;
writeb(op->cmd.opcode, sp->base + MTK_NOR_REG_PRGDATA(4));
if (op->addr.buswidth == 4)
reg |= MTK_NOR_QUAD_ADDR;
} else if (op->data.buswidth == 2) {
reg |= MTK_NOR_DUAL_READ;
writeb(op->cmd.opcode, sp->base + MTK_NOR_REG_PRGDATA(3));
if (op->addr.buswidth == 2)
reg |= MTK_NOR_DUAL_ADDR;
} else {
if (op->cmd.opcode == 0x0b)
mtk_nor_rmw(sp, MTK_NOR_REG_CFG1, MTK_NOR_FAST_READ, 0);
else
mtk_nor_rmw(sp, MTK_NOR_REG_CFG1, 0, MTK_NOR_FAST_READ);
}
mtk_nor_rmw(sp, MTK_NOR_REG_BUSCFG, reg, MTK_NOR_BUS_MODE_MASK);
}
static int mtk_nor_read_dma(struct mtk_nor *sp, u32 from, unsigned int length,
u8 *buffer)
{
int ret = 0;
ulong delay;
u32 reg;
dma_addr_t dma_addr;
dma_addr = dma_map_single(sp->dev, buffer, length, DMA_FROM_DEVICE);
if (dma_mapping_error(sp->dev, dma_addr)) {
dev_err(sp->dev, "failed to map dma buffer.\n");
return -EINVAL;
}
writel(from, sp->base + MTK_NOR_REG_DMA_FADR);
writel(dma_addr, sp->base + MTK_NOR_REG_DMA_DADR);
writel(dma_addr + length, sp->base + MTK_NOR_REG_DMA_END_DADR);
if (sp->has_irq) {
reinit_completion(&sp->op_done);
mtk_nor_rmw(sp, MTK_NOR_REG_IRQ_EN, MTK_NOR_IRQ_DMA, 0);
}
mtk_nor_rmw(sp, MTK_NOR_REG_DMA_CTL, MTK_NOR_DMA_START, 0);
delay = CLK_TO_US(sp, (length + 5) * BITS_PER_BYTE);
if (sp->has_irq) {
if (!wait_for_completion_timeout(&sp->op_done,
(delay + 1) * 100))
ret = -ETIMEDOUT;
} else {
ret = readl_poll_timeout(sp->base + MTK_NOR_REG_DMA_CTL, reg,
!(reg & MTK_NOR_DMA_START), delay / 3,
(delay + 1) * 100);
}
dma_unmap_single(sp->dev, dma_addr, length, DMA_FROM_DEVICE);
if (ret < 0)
dev_err(sp->dev, "dma read timeout.\n");
return ret;
}
static int mtk_nor_read_bounce(struct mtk_nor *sp, u32 from,
unsigned int length, u8 *buffer)
{
unsigned int rdlen;
int ret;
if (length & MTK_NOR_DMA_ALIGN_MASK)
rdlen = (length + MTK_NOR_DMA_ALIGN) & ~MTK_NOR_DMA_ALIGN_MASK;
else
rdlen = length;
ret = mtk_nor_read_dma(sp, from, rdlen, sp->buffer);
if (ret)
return ret;
memcpy(buffer, sp->buffer, length);
return 0;
}
static int mtk_nor_read_pio(struct mtk_nor *sp, const struct spi_mem_op *op)
{
u8 *buf = op->data.buf.in;
int ret;
ret = mtk_nor_cmd_exec(sp, MTK_NOR_CMD_READ, 6 * BITS_PER_BYTE);
if (!ret)
buf[0] = readb(sp->base + MTK_NOR_REG_RDATA);
return ret;
}
static int mtk_nor_write_buffer_enable(struct mtk_nor *sp)
{
int ret;
u32 val;
if (sp->wbuf_en)
return 0;
val = readl(sp->base + MTK_NOR_REG_CFG2);
writel(val | MTK_NOR_WR_BUF_EN, sp->base + MTK_NOR_REG_CFG2);
ret = readl_poll_timeout(sp->base + MTK_NOR_REG_CFG2, val,
val & MTK_NOR_WR_BUF_EN, 0, 10000);
if (!ret)
sp->wbuf_en = true;
return ret;
}
static int mtk_nor_write_buffer_disable(struct mtk_nor *sp)
{
int ret;
u32 val;
if (!sp->wbuf_en)
return 0;
val = readl(sp->base + MTK_NOR_REG_CFG2);
writel(val & ~MTK_NOR_WR_BUF_EN, sp->base + MTK_NOR_REG_CFG2);
ret = readl_poll_timeout(sp->base + MTK_NOR_REG_CFG2, val,
!(val & MTK_NOR_WR_BUF_EN), 0, 10000);
if (!ret)
sp->wbuf_en = false;
return ret;
}
static int mtk_nor_pp_buffered(struct mtk_nor *sp, const struct spi_mem_op *op)
{
const u8 *buf = op->data.buf.out;
u32 val;
int ret, i;
ret = mtk_nor_write_buffer_enable(sp);
if (ret < 0)
return ret;
for (i = 0; i < op->data.nbytes; i += 4) {
val = buf[i + 3] << 24 | buf[i + 2] << 16 | buf[i + 1] << 8 |
buf[i];
writel(val, sp->base + MTK_NOR_REG_PP_DATA);
}
return mtk_nor_cmd_exec(sp, MTK_NOR_CMD_WRITE,
(op->data.nbytes + 5) * BITS_PER_BYTE);
}
static int mtk_nor_pp_unbuffered(struct mtk_nor *sp,
const struct spi_mem_op *op)
{
const u8 *buf = op->data.buf.out;
int ret;
ret = mtk_nor_write_buffer_disable(sp);
if (ret < 0)
return ret;
writeb(buf[0], sp->base + MTK_NOR_REG_WDATA);
return mtk_nor_cmd_exec(sp, MTK_NOR_CMD_WRITE, 6 * BITS_PER_BYTE);
}
spi: spi-mtk-nor: make mtk_nor_exec_op() statuc Fix the following sparse warning: drivers/spi/spi-mtk-nor.c:394:5: warning: symbol 'mtk_nor_exec_op' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Jason Yan <yanaijie@huawei.com> Link: https://lore.kernel.org/r/20200409085009.44971-1-yanaijie@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-04-09 11:50:09 +03:00
static int mtk_nor_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
spi: add support for mediatek spi-nor controller This is a driver for mtk spi-nor controller using spi-mem interface. The same controller already has limited support provided by mtk-quadspi driver under spi-nor framework and this new driver is a replacement for the old one. Comparing to the old driver, this driver has following advantages: 1. It can handle any full-duplex spi transfer up to 6 bytes, and this is implemented using generic spi interface. 2. It take account into command opcode properly. The reading routine in this controller can only use 0x03 or 0x0b as opcode on 1-1-1 transfers, but old driver doesn't implement this properly. This driver checks supported opcode explicitly and use (1) to perform unmatched operations. 3. It properly handles SFDP reading. Old driver can't read SFDP due to the bug mentioned in (2). 4. It can do 1-2-2 and 1-4-4 fast reading on spi-nor. These two ops requires parsing SFDP, which isn't possible in old driver. And the old driver is only flagged to support 1-1-2 mode. 5. It takes advantage of the DMA feature in this controller for long reads and supports IRQ on DMA requests to free cpu cycles from polling status registers on long DMA reading. It achieves up to 17.5MB/s reading speed (1-4-4 mode) which is way faster than the old one. IRQ is implemented as optional to maintain backward compatibility. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> Link: https://lore.kernel.org/r/20200306085052.28258-3-gch981213@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-06 11:50:50 +03:00
{
struct mtk_nor *sp = spi_controller_get_devdata(mem->spi->master);
int ret;
if ((op->data.nbytes == 0) ||
((op->addr.nbytes != 3) && (op->addr.nbytes != 4)))
return -ENOTSUPP;
if (op->data.dir == SPI_MEM_DATA_OUT) {
mtk_nor_set_addr(sp, op);
writeb(op->cmd.opcode, sp->base + MTK_NOR_REG_PRGDATA0);
if (op->data.nbytes == MTK_NOR_PP_SIZE)
return mtk_nor_pp_buffered(sp, op);
return mtk_nor_pp_unbuffered(sp, op);
}
if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op)) {
ret = mtk_nor_write_buffer_disable(sp);
if (ret < 0)
return ret;
mtk_nor_setup_bus(sp, op);
if (op->data.nbytes == 1) {
mtk_nor_set_addr(sp, op);
return mtk_nor_read_pio(sp, op);
} else if (((ulong)(op->data.buf.in) &
MTK_NOR_DMA_ALIGN_MASK)) {
return mtk_nor_read_bounce(sp, op->addr.val,
op->data.nbytes,
op->data.buf.in);
} else {
return mtk_nor_read_dma(sp, op->addr.val,
op->data.nbytes,
op->data.buf.in);
}
}
return -ENOTSUPP;
}
static int mtk_nor_setup(struct spi_device *spi)
{
struct mtk_nor *sp = spi_controller_get_devdata(spi->master);
if (spi->max_speed_hz && (spi->max_speed_hz < sp->spi_freq)) {
dev_err(&spi->dev, "spi clock should be %u Hz.\n",
sp->spi_freq);
return -EINVAL;
}
spi->max_speed_hz = sp->spi_freq;
return 0;
}
static int mtk_nor_transfer_one_message(struct spi_controller *master,
struct spi_message *m)
{
struct mtk_nor *sp = spi_controller_get_devdata(master);
struct spi_transfer *t = NULL;
unsigned long trx_len = 0;
int stat = 0;
int reg_offset = MTK_NOR_REG_PRGDATA_MAX;
void __iomem *reg;
const u8 *txbuf;
u8 *rxbuf;
int i;
list_for_each_entry(t, &m->transfers, transfer_list) {
txbuf = t->tx_buf;
for (i = 0; i < t->len; i++, reg_offset--) {
reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset);
if (txbuf)
writeb(txbuf[i], reg);
else
writeb(0, reg);
}
trx_len += t->len;
}
writel(trx_len * BITS_PER_BYTE, sp->base + MTK_NOR_REG_PRG_CNT);
stat = mtk_nor_cmd_exec(sp, MTK_NOR_CMD_PROGRAM,
trx_len * BITS_PER_BYTE);
if (stat < 0)
goto msg_done;
reg_offset = trx_len - 1;
list_for_each_entry(t, &m->transfers, transfer_list) {
rxbuf = t->rx_buf;
for (i = 0; i < t->len; i++, reg_offset--) {
reg = sp->base + MTK_NOR_REG_SHIFT(reg_offset);
if (rxbuf)
rxbuf[i] = readb(reg);
}
}
m->actual_length = trx_len;
msg_done:
m->status = stat;
spi_finalize_current_message(master);
return 0;
}
static void mtk_nor_disable_clk(struct mtk_nor *sp)
{
clk_disable_unprepare(sp->spi_clk);
clk_disable_unprepare(sp->ctlr_clk);
}
static int mtk_nor_enable_clk(struct mtk_nor *sp)
{
int ret;
ret = clk_prepare_enable(sp->spi_clk);
if (ret)
return ret;
ret = clk_prepare_enable(sp->ctlr_clk);
if (ret) {
clk_disable_unprepare(sp->spi_clk);
return ret;
}
return 0;
}
static int mtk_nor_init(struct mtk_nor *sp)
{
int ret;
ret = mtk_nor_enable_clk(sp);
if (ret)
return ret;
sp->spi_freq = clk_get_rate(sp->spi_clk);
writel(MTK_NOR_ENABLE_SF_CMD, sp->base + MTK_NOR_REG_WP);
mtk_nor_rmw(sp, MTK_NOR_REG_CFG2, MTK_NOR_WR_CUSTOM_OP_EN, 0);
mtk_nor_rmw(sp, MTK_NOR_REG_CFG3,
MTK_NOR_DISABLE_WREN | MTK_NOR_DISABLE_SR_POLL, 0);
return ret;
}
static irqreturn_t mtk_nor_irq_handler(int irq, void *data)
{
struct mtk_nor *sp = data;
u32 irq_status, irq_enabled;
irq_status = readl(sp->base + MTK_NOR_REG_IRQ_STAT);
irq_enabled = readl(sp->base + MTK_NOR_REG_IRQ_EN);
// write status back to clear interrupt
writel(irq_status, sp->base + MTK_NOR_REG_IRQ_STAT);
if (!(irq_status & irq_enabled))
return IRQ_NONE;
if (irq_status & MTK_NOR_IRQ_DMA) {
complete(&sp->op_done);
writel(0, sp->base + MTK_NOR_REG_IRQ_EN);
}
return IRQ_HANDLED;
}
static size_t mtk_max_msg_size(struct spi_device *spi)
{
return MTK_NOR_PRG_MAX_SIZE;
}
static const struct spi_controller_mem_ops mtk_nor_mem_ops = {
.adjust_op_size = mtk_nor_adjust_op_size,
.supports_op = mtk_nor_supports_op,
.exec_op = mtk_nor_exec_op
};
static const struct of_device_id mtk_nor_match[] = {
{ .compatible = "mediatek,mt8173-nor" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mtk_nor_match);
static int mtk_nor_probe(struct platform_device *pdev)
{
struct spi_controller *ctlr;
struct mtk_nor *sp;
void __iomem *base;
u8 *buffer;
struct clk *spi_clk, *ctlr_clk;
int ret, irq;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
spi_clk = devm_clk_get(&pdev->dev, "spi");
if (IS_ERR(spi_clk))
return PTR_ERR(spi_clk);
ctlr_clk = devm_clk_get(&pdev->dev, "sf");
if (IS_ERR(ctlr_clk))
return PTR_ERR(ctlr_clk);
buffer = devm_kmalloc(&pdev->dev,
MTK_NOR_BOUNCE_BUF_SIZE + MTK_NOR_DMA_ALIGN,
GFP_KERNEL);
if (!buffer)
return -ENOMEM;
if ((ulong)buffer & MTK_NOR_DMA_ALIGN_MASK)
buffer = (u8 *)(((ulong)buffer + MTK_NOR_DMA_ALIGN) &
~MTK_NOR_DMA_ALIGN_MASK);
ctlr = spi_alloc_master(&pdev->dev, sizeof(*sp));
if (!ctlr) {
dev_err(&pdev->dev, "failed to allocate spi controller\n");
return -ENOMEM;
}
ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
ctlr->dev.of_node = pdev->dev.of_node;
ctlr->max_message_size = mtk_max_msg_size;
ctlr->mem_ops = &mtk_nor_mem_ops;
ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD;
ctlr->num_chipselect = 1;
ctlr->setup = mtk_nor_setup;
ctlr->transfer_one_message = mtk_nor_transfer_one_message;
dev_set_drvdata(&pdev->dev, ctlr);
sp = spi_controller_get_devdata(ctlr);
sp->base = base;
sp->buffer = buffer;
sp->has_irq = false;
sp->wbuf_en = false;
sp->ctlr = ctlr;
sp->dev = &pdev->dev;
sp->spi_clk = spi_clk;
sp->ctlr_clk = ctlr_clk;
irq = platform_get_irq_optional(pdev, 0);
if (irq < 0) {
dev_warn(sp->dev, "IRQ not available.");
} else {
writel(MTK_NOR_IRQ_MASK, base + MTK_NOR_REG_IRQ_STAT);
writel(0, base + MTK_NOR_REG_IRQ_EN);
ret = devm_request_irq(sp->dev, irq, mtk_nor_irq_handler, 0,
pdev->name, sp);
if (ret < 0) {
dev_warn(sp->dev, "failed to request IRQ.");
} else {
init_completion(&sp->op_done);
sp->has_irq = true;
}
}
ret = mtk_nor_init(sp);
if (ret < 0) {
kfree(ctlr);
return ret;
}
dev_info(&pdev->dev, "spi frequency: %d Hz\n", sp->spi_freq);
return devm_spi_register_controller(&pdev->dev, ctlr);
}
static int mtk_nor_remove(struct platform_device *pdev)
{
struct spi_controller *ctlr;
struct mtk_nor *sp;
ctlr = dev_get_drvdata(&pdev->dev);
sp = spi_controller_get_devdata(ctlr);
mtk_nor_disable_clk(sp);
return 0;
}
static struct platform_driver mtk_nor_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = mtk_nor_match,
},
.probe = mtk_nor_probe,
.remove = mtk_nor_remove,
};
module_platform_driver(mtk_nor_driver);
MODULE_DESCRIPTION("Mediatek SPI NOR controller driver");
MODULE_AUTHOR("Chuanhong Guo <gch981213@gmail.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
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