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spi: spi-mem: Convert Aspeed SMC driver to spi-mem 

Merge series from Cédric Le Goater <clg@kaod.org>:

This series adds a new SPI driver using the spi-mem interface for the
Aspeed static memory controllers of the AST2600, AST2500 and AST2400
SoCs.

 * AST2600 Firmware SPI Memory Controller (FMC)
 * AST2600 SPI Flash Controller (SPI1 and SPI2)
 * AST2500 Firmware SPI Memory Controller (FMC)
 * AST2500 SPI Flash Controller (SPI1 and SPI2)
 * AST2400 New Static Memory Controller (also referred as FMC)
 * AST2400 SPI Flash Controller (SPI)

It is based on the current OpenBMC kernel driver [1], using directly
the MTD SPI-NOR interface and on a patchset [2] previously proposed
adding support for the AST2600 only. This driver takes a slightly
different approach to cover all 6 controllers.

It does not make use of the controller register disabling Address and
Data byte lanes because is not available on the AST2400 SoC. We could
introduce a specific handler for new features available on recent SoCs
if needed. As there is not much difference on performance, the driver
chooses the common denominator: "User mode" which has been heavily
tested in [1]. "User mode" is also used as a fall back method when
flash device mapping window is too small.

Problems to address with spi-mem were the configuration of the mapping
windows and the calibration of the read timings. The driver handles
them in the direct mapping handler when some knowledge on the size of
the flash device is know. It is not perfect but not incorrect either.
The algorithm is one from [1] because it doesn't require the DMA
registers which are not available on all controllers.

Direct mapping for writes is not supported (yet). I have seen some
corruption with writes and I preferred to use the safer and proven
method of the initial driver [1]. We can improve that later.

The driver supports Quad SPI RX transfers on the AST2600 SoC but it
didn't have the expected results. Therefore it is not activated yet.
There are some issues on the pinctrl to investigate first.

Tested on:

 * OpenPOWER Palmetto (AST2400)
 * Facebook Wedge 100 BMC (AST2400) by Tao Ren <rentao.bupt@gmail.com>
 * Evaluation board (AST2500)
 * Inspur FP5280G2 BMC (AST2500) by John Wang <wangzq.jn@gmail.com>
 * Facebook Backpack CMM BMC (AST2500) by Tao Ren <rentao.bupt@gmail.com>
 * OpenPOWER Witherspoon (AST2500)
 * Evaluation board (AST2600 A0 and A3)
 * Rainier board (AST2600)

[1] https://github.com/openbmc/linux/blob/dev-5.15/drivers/mtd/spi-nor/controllers/aspeed-smc.c
[2] https://patchwork.ozlabs.org/project/linux-aspeed/list/?series=212394
parents b1849f50 73ae97e3
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Showing with 1314 additions and 983 deletions
Documentation/devicetree/bindings/mtd/aspeed-smc.txt deleted 100644 → 0
View file @ b1849f50
* Aspeed Firmware Memory controller
* Aspeed SPI Flash Memory Controller
The Firmware Memory Controller in the Aspeed AST2500 SoC supports
three chip selects, two of which are always of SPI type and the third
can be SPI or NOR type flash. These bindings only describe SPI.
The two SPI flash memory controllers in the AST2500 each support two
chip selects.
Required properties:
- compatible : Should be one of
"aspeed,ast2400-fmc" for the AST2400 Firmware Memory Controller
"aspeed,ast2400-spi" for the AST2400 SPI Flash memory Controller
"aspeed,ast2500-fmc" for the AST2500 Firmware Memory Controller
"aspeed,ast2500-spi" for the AST2500 SPI flash memory controllers
- reg : the first contains the control register location and length,
the second contains the memory window mapping address and length
- #address-cells : must be 1 corresponding to chip select child binding
- #size-cells : must be 0 corresponding to chip select child binding
Optional properties:
- interrupts : Should contain the interrupt for the dma device if an
FMC
The child nodes are the SPI flash modules which must have a compatible
property as specified in bindings/mtd/jedec,spi-nor.txt
Optionally, the child node can contain properties for SPI mode (may be
ignored):
- spi-max-frequency - max frequency of spi bus
Example:
fmc: fmc@1e620000 {
compatible = "aspeed,ast2500-fmc";
reg = < 0x1e620000 0x94
0x20000000 0x02000000 >;
#address-cells = <1>;
#size-cells = <0>;
interrupts = <19>;
flash@0 {
reg = < 0 >;
compatible = "jedec,spi-nor";
/* spi-max-frequency = <>; */
/* m25p,fast-read; */
#address-cells = <1>;
#size-cells = <1>;
};
};
Documentation/devicetree/bindings/spi/aspeed,ast2600-fmc.yaml 0 → 100644
View file @ 9c63b846
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/spi/aspeed,ast2600-fmc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Aspeed SMC controllers bindings
maintainers:
- Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
- Cédric Le Goater <clg@kaod.org>
description: |
This binding describes the Aspeed Static Memory Controllers (FMC and
SPI) of the AST2400, AST2500 and AST2600 SOCs.
allOf:
- $ref: "spi-controller.yaml#"
properties:
compatible:
enum:
- aspeed,ast2600-fmc
- aspeed,ast2600-spi
- aspeed,ast2500-fmc
- aspeed,ast2500-spi
- aspeed,ast2400-fmc
- aspeed,ast2400-spi
reg:
items:
- description: registers
- description: memory mapping
clocks:
maxItems: 1
interrupts:
maxItems: 1
required:
- compatible
- reg
- clocks
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/interrupt-controller/aspeed-scu-ic.h>
#include <dt-bindings/clock/ast2600-clock.h>
spi@1e620000 {
reg = <0x1e620000 0xc4>, <0x20000000 0x10000000>;
#address-cells = <1>;
#size-cells = <0>;
compatible = "aspeed,ast2600-fmc";
clocks = <&syscon ASPEED_CLK_AHB>;
interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
flash@0 {
reg = < 0 >;
compatible = "jedec,spi-nor";
spi-max-frequency = <50000000>;
spi-rx-bus-width = <2>;
};
flash@1 {
reg = < 1 >;
compatible = "jedec,spi-nor";
spi-max-frequency = <50000000>;
spi-rx-bus-width = <2>;
};
flash@2 {
reg = < 2 >;
compatible = "jedec,spi-nor";
spi-max-frequency = <50000000>;
spi-rx-bus-width = <2>;
};
};
MAINTAINERS
View file @ 9c63b846
......@@ -3099,6 +3099,16 @@ S: Maintained
F: Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
F: drivers/mmc/host/sdhci-of-aspeed*
ASPEED SMC SPI DRIVER
M: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
M: Cédric Le Goater <clg@kaod.org>
L: linux-aspeed@lists.ozlabs.org (moderated for non-subscribers)
L: openbmc@lists.ozlabs.org (moderated for non-subscribers)
L: linux-spi@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/spi/aspeed,ast2600-fmc.yaml
F: drivers/spi/spi-aspeed-smc.c
ASPEED VIDEO ENGINE DRIVER
M: Eddie James <eajames@linux.ibm.com>
L: linux-media@vger.kernel.org
......
drivers/mtd/spi-nor/controllers/Kconfig
View file @ 9c63b846
# SPDX-License-Identifier: GPL-2.0-only
config SPI_ASPEED_SMC
tristate "Aspeed flash controllers in SPI mode"
depends on ARCH_ASPEED || COMPILE_TEST
depends on HAS_IOMEM && OF
help
This enables support for the Firmware Memory controller (FMC)
in the Aspeed AST2500/AST2400 SoCs when attached to SPI NOR chips,
and support for the SPI flash memory controller (SPI) for
the host firmware. The implementation only supports SPI NOR.
config SPI_HISI_SFC
tristate "Hisilicon FMC SPI NOR Flash Controller(SFC)"
depends on ARCH_HISI || COMPILE_TEST
......
drivers/mtd/spi-nor/controllers/Makefile
View file @ 9c63b846
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_SPI_ASPEED_SMC) += aspeed-smc.o
obj-$(CONFIG_SPI_HISI_SFC) += hisi-sfc.o
obj-$(CONFIG_SPI_NXP_SPIFI) += nxp-spifi.o
drivers/mtd/spi-nor/controllers/aspeed-smc.c deleted 100644 → 0
View file @ b1849f50
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ASPEED Static Memory Controller driver
*
* Copyright (c) 2015-2016, IBM Corporation.
*/
#include <linux/bug.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/spi-nor.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/sizes.h>
#include <linux/sysfs.h>
#define DEVICE_NAME "aspeed-smc"
/*
* The driver only support SPI flash
*/
enum aspeed_smc_flash_type {
smc_type_nor = 0,
smc_type_nand = 1,
smc_type_spi = 2,
};
struct aspeed_smc_chip;
struct aspeed_smc_info {
u32 maxsize; /* maximum size of chip window */
u8 nce; /* number of chip enables */
bool hastype; /* flash type field exists in config reg */
u8 we0; /* shift for write enable bit for CE0 */
u8 ctl0; /* offset in regs of ctl for CE0 */
void (*set_4b)(struct aspeed_smc_chip *chip);
};
static void aspeed_smc_chip_set_4b_spi_2400(struct aspeed_smc_chip *chip);
static void aspeed_smc_chip_set_4b(struct aspeed_smc_chip *chip);
static const struct aspeed_smc_info fmc_2400_info = {
.maxsize = 64 * 1024 * 1024,
.nce = 5,
.hastype = true,
.we0 = 16,
.ctl0 = 0x10,
.set_4b = aspeed_smc_chip_set_4b,
};
static const struct aspeed_smc_info spi_2400_info = {
.maxsize = 64 * 1024 * 1024,
.nce = 1,
.hastype = false,
.we0 = 0,
.ctl0 = 0x04,
.set_4b = aspeed_smc_chip_set_4b_spi_2400,
};
static const struct aspeed_smc_info fmc_2500_info = {
.maxsize = 256 * 1024 * 1024,
.nce = 3,
.hastype = true,
.we0 = 16,
.ctl0 = 0x10,
.set_4b = aspeed_smc_chip_set_4b,
};
static const struct aspeed_smc_info spi_2500_info = {
.maxsize = 128 * 1024 * 1024,
.nce = 2,
.hastype = false,
.we0 = 16,
.ctl0 = 0x10,
.set_4b = aspeed_smc_chip_set_4b,
};
enum aspeed_smc_ctl_reg_value {
smc_base, /* base value without mode for other commands */
smc_read, /* command reg for (maybe fast) reads */
smc_write, /* command reg for writes */
smc_max,
};
struct aspeed_smc_controller;
struct aspeed_smc_chip {
int cs;
struct aspeed_smc_controller *controller;
void __iomem *ctl; /* control register */
void __iomem *ahb_base; /* base of chip window */
u32 ahb_window_size; /* chip mapping window size */
u32 ctl_val[smc_max]; /* control settings */
enum aspeed_smc_flash_type type; /* what type of flash */
struct spi_nor nor;
};
struct aspeed_smc_controller {
struct device *dev;
struct mutex mutex; /* controller access mutex */
const struct aspeed_smc_info *info; /* type info of controller */
void __iomem *regs; /* controller registers */
void __iomem *ahb_base; /* per-chip windows resource */
u32 ahb_window_size; /* full mapping window size */
struct aspeed_smc_chip *chips[]; /* pointers to attached chips */
};
/*
* SPI Flash Configuration Register (AST2500 SPI)
* or
* Type setting Register (AST2500 FMC).
* CE0 and CE1 can only be of type SPI. CE2 can be of type NOR but the
* driver does not support it.
*/
#define CONFIG_REG 0x0
#define CONFIG_DISABLE_LEGACY BIT(31) /* 1 */
#define CONFIG_CE2_WRITE BIT(18)
#define CONFIG_CE1_WRITE BIT(17)
#define CONFIG_CE0_WRITE BIT(16)
#define CONFIG_CE2_TYPE BIT(4) /* AST2500 FMC only */
#define CONFIG_CE1_TYPE BIT(2) /* AST2500 FMC only */
#define CONFIG_CE0_TYPE BIT(0) /* AST2500 FMC only */
/*
* CE Control Register
*/
#define CE_CONTROL_REG 0x4
/*
* CEx Control Register
*/
#define CONTROL_AAF_MODE BIT(31)
#define CONTROL_IO_MODE_MASK GENMASK(30, 28)
#define CONTROL_IO_DUAL_DATA BIT(29)
#define CONTROL_IO_DUAL_ADDR_DATA (BIT(29) | BIT(28))
#define CONTROL_IO_QUAD_DATA BIT(30)
#define CONTROL_IO_QUAD_ADDR_DATA (BIT(30) | BIT(28))
#define CONTROL_CE_INACTIVE_SHIFT 24
#define CONTROL_CE_INACTIVE_MASK GENMASK(27, \
CONTROL_CE_INACTIVE_SHIFT)
/* 0 = 16T ... 15 = 1T T=HCLK */
#define CONTROL_COMMAND_SHIFT 16
#define CONTROL_DUMMY_COMMAND_OUT BIT(15)
#define CONTROL_IO_DUMMY_HI BIT(14)
#define CONTROL_IO_DUMMY_HI_SHIFT 14
#define CONTROL_CLK_DIV4 BIT(13) /* others */
#define CONTROL_IO_ADDRESS_4B BIT(13) /* AST2400 SPI */
#define CONTROL_RW_MERGE BIT(12)
#define CONTROL_IO_DUMMY_LO_SHIFT 6
#define CONTROL_IO_DUMMY_LO GENMASK(7, \
CONTROL_IO_DUMMY_LO_SHIFT)
#define CONTROL_IO_DUMMY_MASK (CONTROL_IO_DUMMY_HI | \
CONTROL_IO_DUMMY_LO)
#define CONTROL_IO_DUMMY_SET(dummy) \
(((((dummy) >> 2) & 0x1) << CONTROL_IO_DUMMY_HI_SHIFT) | \
(((dummy) & 0x3) << CONTROL_IO_DUMMY_LO_SHIFT))
#define CONTROL_CLOCK_FREQ_SEL_SHIFT 8
#define CONTROL_CLOCK_FREQ_SEL_MASK GENMASK(11, \
CONTROL_CLOCK_FREQ_SEL_SHIFT)
#define CONTROL_LSB_FIRST BIT(5)
#define CONTROL_CLOCK_MODE_3 BIT(4)
#define CONTROL_IN_DUAL_DATA BIT(3)
#define CONTROL_CE_STOP_ACTIVE_CONTROL BIT(2)
#define CONTROL_COMMAND_MODE_MASK GENMASK(1, 0)
#define CONTROL_COMMAND_MODE_NORMAL 0
#define CONTROL_COMMAND_MODE_FREAD 1
#define CONTROL_COMMAND_MODE_WRITE 2
#define CONTROL_COMMAND_MODE_USER 3
#define CONTROL_KEEP_MASK \
(CONTROL_AAF_MODE | CONTROL_CE_INACTIVE_MASK | CONTROL_CLK_DIV4 | \
CONTROL_CLOCK_FREQ_SEL_MASK | CONTROL_LSB_FIRST | CONTROL_CLOCK_MODE_3)
/*
* The Segment Register uses a 8MB unit to encode the start address
* and the end address of the mapping window of a flash SPI slave :
*
* | byte 1 | byte 2 | byte 3 | byte 4 |
* +--------+--------+--------+--------+
* | end | start | 0 | 0 |
*/
#define SEGMENT_ADDR_REG0 0x30
#define SEGMENT_ADDR_START(_r) ((((_r) >> 16) & 0xFF) << 23)
#define SEGMENT_ADDR_END(_r) ((((_r) >> 24) & 0xFF) << 23)
#define SEGMENT_ADDR_VALUE(start, end) \
(((((start) >> 23) & 0xFF) << 16) | ((((end) >> 23) & 0xFF) << 24))
#define SEGMENT_ADDR_REG(controller, cs) \
((controller)->regs + SEGMENT_ADDR_REG0 + (cs) * 4)
/*
* In user mode all data bytes read or written to the chip decode address
* range are transferred to or from the SPI bus. The range is treated as a
* fifo of arbitratry 1, 2, or 4 byte width but each write has to be aligned
* to its size. The address within the multiple 8kB range is ignored when
* sending bytes to the SPI bus.
*
* On the arm architecture, as of Linux version 4.3, memcpy_fromio and
* memcpy_toio on little endian targets use the optimized memcpy routines
* that were designed for well behavied memory storage. These routines
* have a stutter if the source and destination are not both word aligned,
* once with a duplicate access to the source after aligning to the
* destination to a word boundary, and again with a duplicate access to
* the source when the final byte count is not word aligned.
*
* When writing or reading the fifo this stutter discards data or sends
* too much data to the fifo and can not be used by this driver.
*
* While the low level io string routines that implement the insl family do
* the desired accesses and memory increments, the cross architecture io
* macros make them essentially impossible to use on a memory mapped address
* instead of a a token from the call to iomap of an io port.
*
* These fifo routines use readl and friends to a constant io port and update
* the memory buffer pointer and count via explicit code. The final updates
* to len are optimistically suppressed.
*/
static int aspeed_smc_read_from_ahb(void *buf, void __iomem *src, size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)src, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
ioread32_rep(src, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
ioread8_rep(src, (u8 *)buf + offset, len);
return 0;
}
static int aspeed_smc_write_to_ahb(void __iomem *dst, const void *buf,
size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)dst, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
iowrite32_rep(dst, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
iowrite8_rep(dst, (const u8 *)buf + offset, len);
return 0;
}
static inline u32 aspeed_smc_chip_write_bit(struct aspeed_smc_chip *chip)
{
return BIT(chip->controller->info->we0 + chip->cs);
}
static void aspeed_smc_chip_check_config(struct aspeed_smc_chip *chip)
{
struct aspeed_smc_controller *controller = chip->controller;
u32 reg;
reg = readl(controller->regs + CONFIG_REG);
if (reg & aspeed_smc_chip_write_bit(chip))
return;
dev_dbg(controller->dev, "config write is not set ! @%p: 0x%08x\n",
controller->regs + CONFIG_REG, reg);
reg |= aspeed_smc_chip_write_bit(chip);
writel(reg, controller->regs + CONFIG_REG);
}
static void aspeed_smc_start_user(struct spi_nor *nor)
{
struct aspeed_smc_chip *chip = nor->priv;
u32 ctl = chip->ctl_val[smc_base];
/*
* When the chip is controlled in user mode, we need write
* access to send the opcodes to it. So check the config.
*/
aspeed_smc_chip_check_config(chip);
ctl |= CONTROL_COMMAND_MODE_USER |
CONTROL_CE_STOP_ACTIVE_CONTROL;
writel(ctl, chip->ctl);
ctl &= ~CONTROL_CE_STOP_ACTIVE_CONTROL;
writel(ctl, chip->ctl);
}
static void aspeed_smc_stop_user(struct spi_nor *nor)
{
struct aspeed_smc_chip *chip = nor->priv;
u32 ctl = chip->ctl_val[smc_read];
u32 ctl2 = ctl | CONTROL_COMMAND_MODE_USER |
CONTROL_CE_STOP_ACTIVE_CONTROL;
writel(ctl2, chip->ctl); /* stop user CE control */
writel(ctl, chip->ctl); /* default to fread or read mode */
}
static int aspeed_smc_prep(struct spi_nor *nor)
{
struct aspeed_smc_chip *chip = nor->priv;
mutex_lock(&chip->controller->mutex);
return 0;
}
static void aspeed_smc_unprep(struct spi_nor *nor)
{
struct aspeed_smc_chip *chip = nor->priv;
mutex_unlock(&chip->controller->mutex);
}
static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
size_t len)
{
struct aspeed_smc_chip *chip = nor->priv;
aspeed_smc_start_user(nor);
aspeed_smc_write_to_ahb(chip->ahb_base, &opcode, 1);
aspeed_smc_read_from_ahb(buf, chip->ahb_base, len);
aspeed_smc_stop_user(nor);
return 0;
}
static int aspeed_smc_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
size_t len)
{
struct aspeed_smc_chip *chip = nor->priv;
aspeed_smc_start_user(nor);
aspeed_smc_write_to_ahb(chip->ahb_base, &opcode, 1);
aspeed_smc_write_to_ahb(chip->ahb_base, buf, len);
aspeed_smc_stop_user(nor);
return 0;
}
static void aspeed_smc_send_cmd_addr(struct spi_nor *nor, u8 cmd, u32 addr)
{
struct aspeed_smc_chip *chip = nor->priv;
__be32 temp;
u32 cmdaddr;
switch (nor->addr_width) {
default:
WARN_ONCE(1, "Unexpected address width %u, defaulting to 3\n",
nor->addr_width);
fallthrough;
case 3:
cmdaddr = addr & 0xFFFFFF;
cmdaddr |= cmd << 24;
temp = cpu_to_be32(cmdaddr);
aspeed_smc_write_to_ahb(chip->ahb_base, &temp, 4);
break;
case 4:
temp = cpu_to_be32(addr);
aspeed_smc_write_to_ahb(chip->ahb_base, &cmd, 1);
aspeed_smc_write_to_ahb(chip->ahb_base, &temp, 4);
break;
}
}
static ssize_t aspeed_smc_read_user(struct spi_nor *nor, loff_t from,
size_t len, u_char *read_buf)
{
struct aspeed_smc_chip *chip = nor->priv;
int i;
u8 dummy = 0xFF;
aspeed_smc_start_user(nor);
aspeed_smc_send_cmd_addr(nor, nor->read_opcode, from);
for (i = 0; i < chip->nor.read_dummy / 8; i++)
aspeed_smc_write_to_ahb(chip->ahb_base, &dummy, sizeof(dummy));
aspeed_smc_read_from_ahb(read_buf, chip->ahb_base, len);
aspeed_smc_stop_user(nor);
return len;
}
static ssize_t aspeed_smc_write_user(struct spi_nor *nor, loff_t to,
size_t len, const u_char *write_buf)
{
struct aspeed_smc_chip *chip = nor->priv;
aspeed_smc_start_user(nor);
aspeed_smc_send_cmd_addr(nor, nor->program_opcode, to);
aspeed_smc_write_to_ahb(chip->ahb_base, write_buf, len);
aspeed_smc_stop_user(nor);
return len;
}
static int aspeed_smc_unregister(struct aspeed_smc_controller *controller)
{
struct aspeed_smc_chip *chip;
int n;
for (n = 0; n < controller->info->nce; n++) {
chip = controller->chips[n];
if (chip)
mtd_device_unregister(&chip->nor.mtd);
}
return 0;
}
static int aspeed_smc_remove(struct platform_device *dev)
{
return aspeed_smc_unregister(platform_get_drvdata(dev));
}
static const struct of_device_id aspeed_smc_matches[] = {
{ .compatible = "aspeed,ast2400-fmc", .data = &fmc_2400_info },
{ .compatible = "aspeed,ast2400-spi", .data = &spi_2400_info },
{ .compatible = "aspeed,ast2500-fmc", .data = &fmc_2500_info },
{ .compatible = "aspeed,ast2500-spi", .data = &spi_2500_info },
{ }
};
MODULE_DEVICE_TABLE(of, aspeed_smc_matches);
/*
* Each chip has a mapping window defined by a segment address
* register defining a start and an end address on the AHB bus. These
* addresses can be configured to fit the chip size and offer a
* contiguous memory region across chips. For the moment, we only
* check that each chip segment is valid.
*/
static void __iomem *aspeed_smc_chip_base(struct aspeed_smc_chip *chip,
struct resource *res)
{
struct aspeed_smc_controller *controller = chip->controller;
u32 offset = 0;
u32 reg;
if (controller->info->nce > 1) {
reg = readl(SEGMENT_ADDR_REG(controller, chip->cs));
if (SEGMENT_ADDR_START(reg) >= SEGMENT_ADDR_END(reg))
return NULL;
offset = SEGMENT_ADDR_START(reg) - res->start;
}
return controller->ahb_base + offset;
}
static u32 aspeed_smc_ahb_base_phy(struct aspeed_smc_controller *controller)
{
u32 seg0_val = readl(SEGMENT_ADDR_REG(controller, 0));
return SEGMENT_ADDR_START(seg0_val);
}
static u32 chip_set_segment(struct aspeed_smc_chip *chip, u32 cs, u32 start,
u32 size)
{
struct aspeed_smc_controller *controller = chip->controller;
void __iomem *seg_reg;
u32 seg_oldval, seg_newval, ahb_base_phy, end;
ahb_base_phy = aspeed_smc_ahb_base_phy(controller);
seg_reg = SEGMENT_ADDR_REG(controller, cs);
seg_oldval = readl(seg_reg);
/*
* If the chip size is not specified, use the default segment
* size, but take into account the possible overlap with the
* previous segment
*/
if (!size)
size = SEGMENT_ADDR_END(seg_oldval) - start;
/*
* The segment cannot exceed the maximum window size of the
* controller.
*/
if (start + size > ahb_base_phy + controller->ahb_window_size) {
size = ahb_base_phy + controller->ahb_window_size - start;
dev_warn(chip->nor.dev, "CE%d window resized to %dMB",
cs, size >> 20);
}
end = start + size;
seg_newval = SEGMENT_ADDR_VALUE(start, end);
writel(seg_newval, seg_reg);
/*
* Restore default value if something goes wrong. The chip
* might have set some bogus value and we would loose access
* to the chip.
*/
if (seg_newval != readl(seg_reg)) {
dev_err(chip->nor.dev, "CE%d window invalid", cs);
writel(seg_oldval, seg_reg);
start = SEGMENT_ADDR_START(seg_oldval);
end = SEGMENT_ADDR_END(seg_oldval);
size = end - start;
}
dev_info(chip->nor.dev, "CE%d window [ 0x%.8x - 0x%.8x ] %dMB",
cs, start, end, size >> 20);
return size;
}
/*
* The segment register defines the mapping window on the AHB bus and
* it needs to be configured depending on the chip size. The segment
* register of the following CE also needs to be tuned in order to
* provide a contiguous window across multiple chips.
*
* This is expected to be called in increasing CE order
*/
static u32 aspeed_smc_chip_set_segment(struct aspeed_smc_chip *chip)
{
struct aspeed_smc_controller *controller = chip->controller;
u32 ahb_base_phy, start;
u32 size = chip->nor.mtd.size;
/*
* Each controller has a chip size limit for direct memory
* access
*/
if (size > controller->info->maxsize)
size = controller->info->maxsize;
/*
* The AST2400 SPI controller only handles one chip and does
* not have segment registers. Let's use the chip size for the
* AHB window.
*/
if (controller->info == &spi_2400_info)
goto out;
/*
* The AST2500 SPI controller has a HW bug when the CE0 chip
* size reaches 128MB. Enforce a size limit of 120MB to
* prevent the controller from using bogus settings in the
* segment register.
*/
if (chip->cs == 0 && controller->info == &spi_2500_info &&
size == SZ_128M) {
size = 120 << 20;
dev_info(chip->nor.dev,
"CE%d window resized to %dMB (AST2500 HW quirk)",
chip->cs, size >> 20);
}
ahb_base_phy = aspeed_smc_ahb_base_phy(controller);
/*
* As a start address for the current segment, use the default
* start address if we are handling CE0 or use the previous
* segment ending address
*/
if (chip->cs) {
u32 prev = readl(SEGMENT_ADDR_REG(controller, chip->cs - 1));
start = SEGMENT_ADDR_END(prev);
} else {
start = ahb_base_phy;
}
size = chip_set_segment(chip, chip->cs, start, size);
/* Update chip base address on the AHB bus */
chip->ahb_base = controller->ahb_base + (start - ahb_base_phy);
/*
* Now, make sure the next segment does not overlap with the
* current one we just configured, even if there is no
* available chip. That could break access in Command Mode.
*/
if (chip->cs < controller->info->nce - 1)
chip_set_segment(chip, chip->cs + 1, start + size, 0);
out:
if (size < chip->nor.mtd.size)
dev_warn(chip->nor.dev,
"CE%d window too small for chip %dMB",
chip->cs, (u32)chip->nor.mtd.size >> 20);
return size;
}
static void aspeed_smc_chip_enable_write(struct aspeed_smc_chip *chip)
{
struct aspeed_smc_controller *controller = chip->controller;
u32 reg;
reg = readl(controller->regs + CONFIG_REG);
reg |= aspeed_smc_chip_write_bit(chip);
writel(reg, controller->regs + CONFIG_REG);
}
static void aspeed_smc_chip_set_type(struct aspeed_smc_chip *chip, int type)
{
struct aspeed_smc_controller *controller = chip->controller;
u32 reg;
chip->type = type;
reg = readl(controller->regs + CONFIG_REG);
reg &= ~(3 << (chip->cs * 2));
reg |= chip->type << (chip->cs * 2);
writel(reg, controller->regs + CONFIG_REG);
}
/*
* The first chip of the AST2500 FMC flash controller is strapped by
* hardware, or autodetected, but other chips need to be set. Enforce
* the 4B setting for all chips.
*/
static void aspeed_smc_chip_set_4b(struct aspeed_smc_chip *chip)
{
struct aspeed_smc_controller *controller = chip->controller;
u32 reg;
reg = readl(controller->regs + CE_CONTROL_REG);
reg |= 1 << chip->cs;
writel(reg, controller->regs + CE_CONTROL_REG);
}
/*
* The AST2400 SPI flash controller does not have a CE Control
* register. It uses the CE0 control register to set 4Byte mode at the
* controller level.
*/
static void aspeed_smc_chip_set_4b_spi_2400(struct aspeed_smc_chip *chip)
{
chip->ctl_val[smc_base] |= CONTROL_IO_ADDRESS_4B;
chip->ctl_val[smc_read] |= CONTROL_IO_ADDRESS_4B;
}
static int aspeed_smc_chip_setup_init(struct aspeed_smc_chip *chip,
struct resource *res)
{
struct aspeed_smc_controller *controller = chip->controller;
const struct aspeed_smc_info *info = controller->info;
u32 reg, base_reg;
/*
* Always turn on the write enable bit to allow opcodes to be
* sent in user mode.
*/
aspeed_smc_chip_enable_write(chip);
/* The driver only supports SPI type flash */
if (info->hastype)
aspeed_smc_chip_set_type(chip, smc_type_spi);
/*
* Configure chip base address in memory
*/
chip->ahb_base = aspeed_smc_chip_base(chip, res);
if (!chip->ahb_base) {
dev_warn(chip->nor.dev, "CE%d window closed", chip->cs);
return -EINVAL;
}
/*
* Get value of the inherited control register. U-Boot usually
* does some timing calibration on the FMC chip, so it's good
* to keep them. In the future, we should handle calibration
* from Linux.
*/
reg = readl(chip->ctl);
dev_dbg(controller->dev, "control register: %08x\n", reg);
base_reg = reg & CONTROL_KEEP_MASK;
if (base_reg != reg) {
dev_dbg(controller->dev,
"control register changed to: %08x\n",
base_reg);
}
chip->ctl_val[smc_base] = base_reg;
/*
* Retain the prior value of the control register as the
* default if it was normal access mode. Otherwise start with
* the sanitized base value set to read mode.
*/
if ((reg & CONTROL_COMMAND_MODE_MASK) ==
CONTROL_COMMAND_MODE_NORMAL)
chip->ctl_val[smc_read] = reg;
else
chip->ctl_val[smc_read] = chip->ctl_val[smc_base] |
CONTROL_COMMAND_MODE_NORMAL;
dev_dbg(controller->dev, "default control register: %08x\n",
chip->ctl_val[smc_read]);
return 0;
}
static int aspeed_smc_chip_setup_finish(struct aspeed_smc_chip *chip)
{
struct aspeed_smc_controller *controller = chip->controller;
const struct aspeed_smc_info *info = controller->info;
u32 cmd;
if (chip->nor.addr_width == 4 && info->set_4b)
info->set_4b(chip);
/* This is for direct AHB access when using Command Mode. */
chip->ahb_window_size = aspeed_smc_chip_set_segment(chip);
/*
* base mode has not been optimized yet. use it for writes.
*/
chip->ctl_val[smc_write] = chip->ctl_val[smc_base] |
chip->nor.program_opcode << CONTROL_COMMAND_SHIFT |
CONTROL_COMMAND_MODE_WRITE;
dev_dbg(controller->dev, "write control register: %08x\n",
chip->ctl_val[smc_write]);
/*
* TODO: Adjust clocks if fast read is supported and interpret
* SPI NOR flags to adjust controller settings.
*/
if (chip->nor.read_proto == SNOR_PROTO_1_1_1) {
if (chip->nor.read_dummy == 0)
cmd = CONTROL_COMMAND_MODE_NORMAL;
else
cmd = CONTROL_COMMAND_MODE_FREAD;
} else {
dev_err(chip->nor.dev, "unsupported SPI read mode\n");
return -EINVAL;
}
chip->ctl_val[smc_read] |= cmd |
CONTROL_IO_DUMMY_SET(chip->nor.read_dummy / 8);
dev_dbg(controller->dev, "base control register: %08x\n",
chip->ctl_val[smc_read]);
return 0;
}
static const struct spi_nor_controller_ops aspeed_smc_controller_ops = {
.prepare = aspeed_smc_prep,
.unprepare = aspeed_smc_unprep,
.read_reg = aspeed_smc_read_reg,
.write_reg = aspeed_smc_write_reg,
.read = aspeed_smc_read_user,
.write = aspeed_smc_write_user,
};
static int aspeed_smc_setup_flash(struct aspeed_smc_controller *controller,
struct device_node *np, struct resource *r)
{
const struct spi_nor_hwcaps hwcaps = {
.mask = SNOR_HWCAPS_READ |
SNOR_HWCAPS_READ_FAST |
SNOR_HWCAPS_PP,
};
const struct aspeed_smc_info *info = controller->info;
struct device *dev = controller->dev;
struct device_node *child;
unsigned int cs;
int ret = -ENODEV;
bool found_one = false;
for_each_available_child_of_node(np, child) {
struct aspeed_smc_chip *chip;
struct spi_nor *nor;
struct mtd_info *mtd;
/* This driver does not support NAND or NOR flash devices. */
if (!of_device_is_compatible(child, "jedec,spi-nor"))
continue;
ret = of_property_read_u32(child, "reg", &cs);
if (ret) {
dev_err(dev, "Couldn't not read chip select.\n");
break;
}
if (cs >= info->nce) {
dev_err(dev, "Chip select %d out of range.\n",
cs);
ret = -ERANGE;
break;
}
if (controller->chips[cs]) {
dev_err(dev, "Chip select %d already in use by %s\n",
cs, dev_name(controller->chips[cs]->nor.dev));
ret = -EBUSY;
break;
}
chip = devm_kzalloc(controller->dev, sizeof(*chip), GFP_KERNEL);
if (!chip) {
ret = -ENOMEM;
break;
}
chip->controller = controller;
chip->ctl = controller->regs + info->ctl0 + cs * 4;
chip->cs = cs;
nor = &chip->nor;
mtd = &nor->mtd;
nor->dev = dev;
nor->priv = chip;
spi_nor_set_flash_node(nor, child);
nor->controller_ops = &aspeed_smc_controller_ops;
ret = aspeed_smc_chip_setup_init(chip, r);
if (ret)
break;
/*
* TODO: Add support for Dual and Quad SPI protocols
* attach when board support is present as determined
* by of property.
*/
ret = spi_nor_scan(nor, NULL, &hwcaps);
/*
* If we fail to scan the device it might not be present or
* broken. Don't fail the whole controller if others work.
*/
if (ret) {
if (found_one)
ret = 0;
devm_kfree(controller->dev, chip);
continue;
}
ret = aspeed_smc_chip_setup_finish(chip);
if (ret)
break;
ret = mtd_device_register(mtd, NULL, 0);
if (ret)
break;
controller->chips[cs] = chip;
found_one = true;
}
if (ret) {
of_node_put(child);
aspeed_smc_unregister(controller);
}
return ret;
}
static int aspeed_smc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct aspeed_smc_controller *controller;
const struct of_device_id *match;
const struct aspeed_smc_info *info;
struct resource *res;
int ret;
match = of_match_device(aspeed_smc_matches, &pdev->dev);
if (!match || !match->data)
return -ENODEV;
info = match->data;
controller = devm_kzalloc(&pdev->dev,
struct_size(controller, chips, info->nce),
GFP_KERNEL);
if (!controller)
return -ENOMEM;
controller->info = info;
controller->dev = dev;
mutex_init(&controller->mutex);
platform_set_drvdata(pdev, controller);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
controller->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(controller->regs))
return PTR_ERR(controller->regs);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
controller->ahb_base = devm_ioremap_resource(dev, res);
if (IS_ERR(controller->ahb_base))
return PTR_ERR(controller->ahb_base);
controller->ahb_window_size = resource_size(res);
ret = aspeed_smc_setup_flash(controller, np, res);
if (ret)
dev_err(dev, "Aspeed SMC probe failed %d\n", ret);
return ret;
}
static struct platform_driver aspeed_smc_driver = {
.probe = aspeed_smc_probe,
.remove = aspeed_smc_remove,
.driver = {
.name = DEVICE_NAME,
.of_match_table = aspeed_smc_matches,
}
};
module_platform_driver(aspeed_smc_driver);
MODULE_DESCRIPTION("ASPEED Static Memory Controller Driver");
MODULE_AUTHOR("Cedric Le Goater <clg@kaod.org>");
MODULE_LICENSE("GPL v2");
drivers/spi/Kconfig
View file @ 9c63b846
......@@ -101,6 +101,17 @@ config SPI_ARMADA_3700
This enables support for the SPI controller present on the
Marvell Armada 3700 SoCs.
config SPI_ASPEED_SMC
tristate "Aspeed flash controllers in SPI mode"
depends on ARCH_ASPEED || COMPILE_TEST
depends on OF
help
This enables support for the Firmware Memory controller (FMC)
in the Aspeed AST2600, AST2500 and AST2400 SoCs when attached
to SPI NOR chips, and support for the SPI flash memory
controller (SPI) for the host firmware. The implementation
only supports SPI NOR.
config SPI_ATMEL
tristate "Atmel SPI Controller"
depends on ARCH_AT91 || COMPILE_TEST
......
drivers/spi/Makefile
View file @ 9c63b846
......@@ -19,6 +19,7 @@ obj-$(CONFIG_SPI_ALTERA_CORE) += spi-altera-core.o
obj-$(CONFIG_SPI_ALTERA_DFL) += spi-altera-dfl.o
obj-$(CONFIG_SPI_AR934X) += spi-ar934x.o
obj-$(CONFIG_SPI_ARMADA_3700) += spi-armada-3700.o
obj-$(CONFIG_SPI_ASPEED_SMC) += spi-aspeed-smc.o
obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o
obj-$(CONFIG_SPI_ATMEL_QUADSPI) += atmel-quadspi.o
obj-$(CONFIG_SPI_AT91_USART) += spi-at91-usart.o
......
drivers/spi/spi-aspeed-smc.c 0 → 100644
View file @ 9c63b846
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ASPEED FMC/SPI Memory Controller Driver
*
* Copyright (c) 2015-2022, IBM Corporation.
* Copyright (c) 2020, ASPEED Corporation.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
#define DEVICE_NAME "spi-aspeed-smc"
/* Type setting Register */
#define CONFIG_REG 0x0
#define CONFIG_TYPE_SPI 0x2
/* CE Control Register */
#define CE_CTRL_REG 0x4
/* CEx Control Register */
#define CE0_CTRL_REG 0x10
#define CTRL_IO_MODE_MASK GENMASK(30, 28)
#define CTRL_IO_SINGLE_DATA 0x0
#define CTRL_IO_DUAL_DATA BIT(29)
#define CTRL_IO_QUAD_DATA BIT(30)
#define CTRL_COMMAND_SHIFT 16
#define CTRL_IO_ADDRESS_4B BIT(13) /* AST2400 SPI only */
#define CTRL_IO_DUMMY_SET(dummy) \
(((((dummy) >> 2) & 0x1) << 14) | (((dummy) & 0x3) << 6))
#define CTRL_FREQ_SEL_SHIFT 8
#define CTRL_FREQ_SEL_MASK GENMASK(11, CTRL_FREQ_SEL_SHIFT)
#define CTRL_CE_STOP_ACTIVE BIT(2)
#define CTRL_IO_MODE_CMD_MASK GENMASK(1, 0)
#define CTRL_IO_MODE_NORMAL 0x0
#define CTRL_IO_MODE_READ 0x1
#define CTRL_IO_MODE_WRITE 0x2
#define CTRL_IO_MODE_USER 0x3
#define CTRL_IO_CMD_MASK 0xf0ff40c3
/* CEx Address Decoding Range Register */
#define CE0_SEGMENT_ADDR_REG 0x30
/* CEx Read timing compensation register */
#define CE0_TIMING_COMPENSATION_REG 0x94
enum aspeed_spi_ctl_reg_value {
ASPEED_SPI_BASE,
ASPEED_SPI_READ,
ASPEED_SPI_WRITE,
ASPEED_SPI_MAX,
};
struct aspeed_spi;
struct aspeed_spi_chip {
struct aspeed_spi *aspi;
u32 cs;
void __iomem *ctl;
void __iomem *ahb_base;
u32 ahb_window_size;
u32 ctl_val[ASPEED_SPI_MAX];
u32 clk_freq;
};
struct aspeed_spi_data {
u32 ctl0;
u32 max_cs;
bool hastype;
u32 mode_bits;
u32 we0;
u32 timing;
u32 hclk_mask;
u32 hdiv_max;
u32 (*segment_start)(struct aspeed_spi *aspi, u32 reg);
u32 (*segment_end)(struct aspeed_spi *aspi, u32 reg);
u32 (*segment_reg)(struct aspeed_spi *aspi, u32 start, u32 end);
int (*calibrate)(struct aspeed_spi_chip *chip, u32 hdiv,
const u8 *golden_buf, u8 *test_buf);
};
#define ASPEED_SPI_MAX_NUM_CS 5
struct aspeed_spi {
const struct aspeed_spi_data *data;
void __iomem *regs;
void __iomem *ahb_base;
u32 ahb_base_phy;
u32 ahb_window_size;
struct device *dev;
struct clk *clk;
u32 clk_freq;
struct aspeed_spi_chip chips[ASPEED_SPI_MAX_NUM_CS];
};
static u32 aspeed_spi_get_io_mode(const struct spi_mem_op *op)
{
switch (op->data.buswidth) {
case 1:
return CTRL_IO_SINGLE_DATA;
case 2:
return CTRL_IO_DUAL_DATA;
case 4:
return CTRL_IO_QUAD_DATA;
default:
return CTRL_IO_SINGLE_DATA;
}
}
static void aspeed_spi_set_io_mode(struct aspeed_spi_chip *chip, u32 io_mode)
{
u32 ctl;
if (io_mode > 0) {
ctl = readl(chip->ctl) & ~CTRL_IO_MODE_MASK;
ctl |= io_mode;
writel(ctl, chip->ctl);
}
}
static void aspeed_spi_start_user(struct aspeed_spi_chip *chip)
{
u32 ctl = chip->ctl_val[ASPEED_SPI_BASE];
ctl |= CTRL_IO_MODE_USER | CTRL_CE_STOP_ACTIVE;
writel(ctl, chip->ctl);
ctl &= ~CTRL_CE_STOP_ACTIVE;
writel(ctl, chip->ctl);
}
static void aspeed_spi_stop_user(struct aspeed_spi_chip *chip)
{
u32 ctl = chip->ctl_val[ASPEED_SPI_READ] |
CTRL_IO_MODE_USER | CTRL_CE_STOP_ACTIVE;
writel(ctl, chip->ctl);
/* Restore defaults */
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
}
static int aspeed_spi_read_from_ahb(void *buf, void __iomem *src, size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)src, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
ioread32_rep(src, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
ioread8_rep(src, (u8 *)buf + offset, len);
return 0;
}
static int aspeed_spi_write_to_ahb(void __iomem *dst, const void *buf, size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)dst, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
iowrite32_rep(dst, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
iowrite8_rep(dst, (const u8 *)buf + offset, len);
return 0;
}
static int aspeed_spi_send_cmd_addr(struct aspeed_spi_chip *chip, u8 addr_nbytes,
u64 offset, u32 opcode)
{
__be32 temp;
u32 cmdaddr;
switch (addr_nbytes) {
case 3:
cmdaddr = offset & 0xFFFFFF;
cmdaddr |= opcode << 24;
temp = cpu_to_be32(cmdaddr);
aspeed_spi_write_to_ahb(chip->ahb_base, &temp, 4);
break;
case 4:
temp = cpu_to_be32(offset);
aspeed_spi_write_to_ahb(chip->ahb_base, &opcode, 1);
aspeed_spi_write_to_ahb(chip->ahb_base, &temp, 4);
break;
default:
WARN_ONCE(1, "Unexpected address width %u", addr_nbytes);
return -EOPNOTSUPP;
}
return 0;
}
static int aspeed_spi_read_reg(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op)
{
aspeed_spi_start_user(chip);
aspeed_spi_write_to_ahb(chip->ahb_base, &op->cmd.opcode, 1);
aspeed_spi_read_from_ahb(op->data.buf.in,
chip->ahb_base, op->data.nbytes);
aspeed_spi_stop_user(chip);
return 0;
}
static int aspeed_spi_write_reg(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op)
{
aspeed_spi_start_user(chip);
aspeed_spi_write_to_ahb(chip->ahb_base, &op->cmd.opcode, 1);
aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out,
op->data.nbytes);
aspeed_spi_stop_user(chip);
return 0;
}
static ssize_t aspeed_spi_read_user(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op,
u64 offset, size_t len, void *buf)
{
int io_mode = aspeed_spi_get_io_mode(op);
u8 dummy = 0xFF;
int i;
int ret;
aspeed_spi_start_user(chip);
ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, offset, op->cmd.opcode);
if (ret < 0)
return ret;
if (op->dummy.buswidth && op->dummy.nbytes) {
for (i = 0; i < op->dummy.nbytes / op->dummy.buswidth; i++)
aspeed_spi_write_to_ahb(chip->ahb_base, &dummy, sizeof(dummy));
}
aspeed_spi_set_io_mode(chip, io_mode);
aspeed_spi_read_from_ahb(buf, chip->ahb_base, len);
aspeed_spi_stop_user(chip);
return 0;
}
static ssize_t aspeed_spi_write_user(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op)
{
int ret;
aspeed_spi_start_user(chip);
ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, op->addr.val, op->cmd.opcode);
if (ret < 0)
return ret;
aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out, op->data.nbytes);
aspeed_spi_stop_user(chip);
return 0;
}
/* support for 1-1-1, 1-1-2 or 1-1-4 */
static bool aspeed_spi_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
if (op->cmd.buswidth > 1)
return false;
if (op->addr.nbytes != 0) {
if (op->addr.buswidth > 1)
return false;
if (op->addr.nbytes < 3 || op->addr.nbytes > 4)
return false;
}
if (op->dummy.nbytes != 0) {
if (op->dummy.buswidth > 1 || op->dummy.nbytes > 7)
return false;
}
if (op->data.nbytes != 0 && op->data.buswidth > 4)
return false;
return spi_mem_default_supports_op(mem, op);
}
static const struct aspeed_spi_data ast2400_spi_data;
static int do_aspeed_spi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(mem->spi->master);
struct aspeed_spi_chip *chip = &aspi->chips[mem->spi->chip_select];
u32 addr_mode, addr_mode_backup;
u32 ctl_val;
int ret = 0;
dev_dbg(aspi->dev,
"CE%d %s OP %#x mode:%d.%d.%d.%d naddr:%#x ndummies:%#x len:%#x",
chip->cs, op->data.dir == SPI_MEM_DATA_IN ? "read" : "write",
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
op->dummy.buswidth, op->data.buswidth,
op->addr.nbytes, op->dummy.nbytes, op->data.nbytes);
addr_mode = readl(aspi->regs + CE_CTRL_REG);
addr_mode_backup = addr_mode;
ctl_val = chip->ctl_val[ASPEED_SPI_BASE];
ctl_val &= ~CTRL_IO_CMD_MASK;
ctl_val |= op->cmd.opcode << CTRL_COMMAND_SHIFT;
/* 4BYTE address mode */
if (op->addr.nbytes) {
if (op->addr.nbytes == 4)
addr_mode |= (0x11 << chip->cs);
else
addr_mode &= ~(0x11 << chip->cs);
if (op->addr.nbytes == 4 && chip->aspi->data == &ast2400_spi_data)
ctl_val |= CTRL_IO_ADDRESS_4B;
}
if (op->dummy.nbytes)
ctl_val |= CTRL_IO_DUMMY_SET(op->dummy.nbytes / op->dummy.buswidth);
if (op->data.nbytes)
ctl_val |= aspeed_spi_get_io_mode(op);
if (op->data.dir == SPI_MEM_DATA_OUT)
ctl_val |= CTRL_IO_MODE_WRITE;
else
ctl_val |= CTRL_IO_MODE_READ;
if (addr_mode != addr_mode_backup)
writel(addr_mode, aspi->regs + CE_CTRL_REG);
writel(ctl_val, chip->ctl);
if (op->data.dir == SPI_MEM_DATA_IN) {
if (!op->addr.nbytes)
ret = aspeed_spi_read_reg(chip, op);
else
ret = aspeed_spi_read_user(chip, op, op->addr.val,
op->data.nbytes, op->data.buf.in);
} else {
if (!op->addr.nbytes)
ret = aspeed_spi_write_reg(chip, op);
else
ret = aspeed_spi_write_user(chip, op);
}
/* Restore defaults */
if (addr_mode != addr_mode_backup)
writel(addr_mode_backup, aspi->regs + CE_CTRL_REG);
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
return ret;
}
static int aspeed_spi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
int ret;
ret = do_aspeed_spi_exec_op(mem, op);
if (ret)
dev_err(&mem->spi->dev, "operation failed: %d\n", ret);
return ret;
}
static const char *aspeed_spi_get_name(struct spi_mem *mem)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(mem->spi->master);
struct device *dev = aspi->dev;
return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), mem->spi->chip_select);
}
struct aspeed_spi_window {
u32 cs;
u32 offset;
u32 size;
};
static void aspeed_spi_get_windows(struct aspeed_spi *aspi,
struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS])
{
const struct aspeed_spi_data *data = aspi->data;
u32 reg_val;
u32 cs;
for (cs = 0; cs < aspi->data->max_cs; cs++) {
reg_val = readl(aspi->regs + CE0_SEGMENT_ADDR_REG + cs * 4);
windows[cs].cs = cs;
windows[cs].size = data->segment_end(aspi, reg_val) -
data->segment_start(aspi, reg_val);
windows[cs].offset = cs ? windows[cs - 1].offset + windows[cs - 1].size : 0;
dev_vdbg(aspi->dev, "CE%d offset=0x%.8x size=0x%x\n", cs,
windows[cs].offset, windows[cs].size);
}
}
/*
* On the AST2600, some CE windows are closed by default at reset but
* U-Boot should open all.
*/
static int aspeed_spi_chip_set_default_window(struct aspeed_spi_chip *chip)
{
struct aspeed_spi *aspi = chip->aspi;
struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS] = { 0 };
struct aspeed_spi_window *win = &windows[chip->cs];
/* No segment registers for the AST2400 SPI controller */
if (aspi->data == &ast2400_spi_data) {
win->offset = 0;
win->size = aspi->ahb_window_size;
} else {
aspeed_spi_get_windows(aspi, windows);
}
chip->ahb_base = aspi->ahb_base + win->offset;
chip->ahb_window_size = win->size;
dev_dbg(aspi->dev, "CE%d default window [ 0x%.8x - 0x%.8x ] %dMB",
chip->cs, aspi->ahb_base_phy + win->offset,
aspi->ahb_base_phy + win->offset + win->size - 1,
win->size >> 20);
return chip->ahb_window_size ? 0 : -1;
}
static int aspeed_spi_set_window(struct aspeed_spi *aspi,
const struct aspeed_spi_window *win)
{
u32 start = aspi->ahb_base_phy + win->offset;
u32 end = start + win->size;
void __iomem *seg_reg = aspi->regs + CE0_SEGMENT_ADDR_REG + win->cs * 4;
u32 seg_val_backup = readl(seg_reg);
u32 seg_val = aspi->data->segment_reg(aspi, start, end);
if (seg_val == seg_val_backup)
return 0;
writel(seg_val, seg_reg);
/*
* Restore initial value if something goes wrong else we could
* loose access to the chip.
*/
if (seg_val != readl(seg_reg)) {
dev_err(aspi->dev, "CE%d invalid window [ 0x%.8x - 0x%.8x ] %dMB",
win->cs, start, end - 1, win->size >> 20);
writel(seg_val_backup, seg_reg);
return -EIO;
}
if (win->size)
dev_dbg(aspi->dev, "CE%d new window [ 0x%.8x - 0x%.8x ] %dMB",
win->cs, start, end - 1, win->size >> 20);
else
dev_dbg(aspi->dev, "CE%d window closed", win->cs);
return 0;
}
/*
* Yet to be done when possible :
* - Align mappings on flash size (we don't have the info)
* - ioremap each window, not strictly necessary since the overall window
* is correct.
*/
static const struct aspeed_spi_data ast2500_spi_data;
static const struct aspeed_spi_data ast2600_spi_data;
static const struct aspeed_spi_data ast2600_fmc_data;
static int aspeed_spi_chip_adjust_window(struct aspeed_spi_chip *chip,
u32 local_offset, u32 size)
{
struct aspeed_spi *aspi = chip->aspi;
struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS] = { 0 };
struct aspeed_spi_window *win = &windows[chip->cs];
int ret;
/* No segment registers for the AST2400 SPI controller */
if (aspi->data == &ast2400_spi_data)
return 0;
/*
* Due to an HW issue on the AST2500 SPI controller, the CE0
* window size should be smaller than the maximum 128MB.
*/
if (aspi->data == &ast2500_spi_data && chip->cs == 0 && size == SZ_128M) {
size = 120 << 20;
dev_info(aspi->dev, "CE%d window resized to %dMB (AST2500 HW quirk)",
chip->cs, size >> 20);
}
/*
* The decoding size of AST2600 SPI controller should set at
* least 2MB.
*/
if ((aspi->data == &ast2600_spi_data || aspi->data == &ast2600_fmc_data) &&
size < SZ_2M) {
size = SZ_2M;
dev_info(aspi->dev, "CE%d window resized to %dMB (AST2600 Decoding)",
chip->cs, size >> 20);
}
aspeed_spi_get_windows(aspi, windows);
/* Adjust this chip window */
win->offset += local_offset;
win->size = size;
if (win->offset + win->size > aspi->ahb_window_size) {
win->size = aspi->ahb_window_size - win->offset;
dev_warn(aspi->dev, "CE%d window resized to %dMB", chip->cs, win->size >> 20);
}
ret = aspeed_spi_set_window(aspi, win);
if (ret)
return ret;
/* Update chip mapping info */
chip->ahb_base = aspi->ahb_base + win->offset;
chip->ahb_window_size = win->size;
/*
* Also adjust next chip window to make sure that it does not
* overlap with the current window.
*/
if (chip->cs < aspi->data->max_cs - 1) {
struct aspeed_spi_window *next = &windows[chip->cs + 1];
/* Change offset and size to keep the same end address */
if ((next->offset + next->size) > (win->offset + win->size))
next->size = (next->offset + next->size) - (win->offset + win->size);
else
next->size = 0;
next->offset = win->offset + win->size;
aspeed_spi_set_window(aspi, next);
}
return 0;
}
static int aspeed_spi_do_calibration(struct aspeed_spi_chip *chip);
static int aspeed_spi_dirmap_create(struct spi_mem_dirmap_desc *desc)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(desc->mem->spi->master);
struct aspeed_spi_chip *chip = &aspi->chips[desc->mem->spi->chip_select];
struct spi_mem_op *op = &desc->info.op_tmpl;
u32 ctl_val;
int ret = 0;
chip->clk_freq = desc->mem->spi->max_speed_hz;
/* Only for reads */
if (op->data.dir != SPI_MEM_DATA_IN)
return -EOPNOTSUPP;
aspeed_spi_chip_adjust_window(chip, desc->info.offset, desc->info.length);
if (desc->info.length > chip->ahb_window_size)
dev_warn(aspi->dev, "CE%d window (%dMB) too small for mapping",
chip->cs, chip->ahb_window_size >> 20);
/* Define the default IO read settings */
ctl_val = readl(chip->ctl) & ~CTRL_IO_CMD_MASK;
ctl_val |= aspeed_spi_get_io_mode(op) |
op->cmd.opcode << CTRL_COMMAND_SHIFT |
CTRL_IO_DUMMY_SET(op->dummy.nbytes / op->dummy.buswidth) |
CTRL_IO_MODE_READ;
/* Tune 4BYTE address mode */
if (op->addr.nbytes) {
u32 addr_mode = readl(aspi->regs + CE_CTRL_REG);
if (op->addr.nbytes == 4)
addr_mode |= (0x11 << chip->cs);
else
addr_mode &= ~(0x11 << chip->cs);
writel(addr_mode, aspi->regs + CE_CTRL_REG);
/* AST2400 SPI controller sets 4BYTE address mode in
* CE0 Control Register
*/
if (op->addr.nbytes == 4 && chip->aspi->data == &ast2400_spi_data)
ctl_val |= CTRL_IO_ADDRESS_4B;
}
/* READ mode is the controller default setting */
chip->ctl_val[ASPEED_SPI_READ] = ctl_val;
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
ret = aspeed_spi_do_calibration(chip);
dev_info(aspi->dev, "CE%d read buswidth:%d [0x%08x]\n",
chip->cs, op->data.buswidth, chip->ctl_val[ASPEED_SPI_READ]);
return ret;
}
static ssize_t aspeed_spi_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offset, size_t len, void *buf)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(desc->mem->spi->master);
struct aspeed_spi_chip *chip = &aspi->chips[desc->mem->spi->chip_select];
/* Switch to USER command mode if mapping window is too small */
if (chip->ahb_window_size < offset + len) {
int ret;
ret = aspeed_spi_read_user(chip, &desc->info.op_tmpl, offset, len, buf);
if (ret < 0)
return ret;
} else {
memcpy_fromio(buf, chip->ahb_base + offset, len);
}
return len;
}
static const struct spi_controller_mem_ops aspeed_spi_mem_ops = {
.supports_op = aspeed_spi_supports_op,
.exec_op = aspeed_spi_exec_op,
.get_name = aspeed_spi_get_name,
.dirmap_create = aspeed_spi_dirmap_create,
.dirmap_read = aspeed_spi_dirmap_read,
};
static void aspeed_spi_chip_set_type(struct aspeed_spi *aspi, unsigned int cs, int type)
{
u32 reg;
reg = readl(aspi->regs + CONFIG_REG);
reg &= ~(0x3 << (cs * 2));
reg |= type << (cs * 2);
writel(reg, aspi->regs + CONFIG_REG);
}
static void aspeed_spi_chip_enable(struct aspeed_spi *aspi, unsigned int cs, bool enable)
{
u32 we_bit = BIT(aspi->data->we0 + cs);
u32 reg = readl(aspi->regs + CONFIG_REG);
if (enable)
reg |= we_bit;
else
reg &= ~we_bit;
writel(reg, aspi->regs + CONFIG_REG);
}
static int aspeed_spi_setup(struct spi_device *spi)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(spi->master);
const struct aspeed_spi_data *data = aspi->data;
unsigned int cs = spi->chip_select;
struct aspeed_spi_chip *chip = &aspi->chips[cs];
chip->aspi = aspi;
chip->cs = cs;
chip->ctl = aspi->regs + data->ctl0 + cs * 4;
/* The driver only supports SPI type flash */
if (data->hastype)
aspeed_spi_chip_set_type(aspi, cs, CONFIG_TYPE_SPI);
if (aspeed_spi_chip_set_default_window(chip) < 0) {
dev_warn(aspi->dev, "CE%d window invalid", cs);
return -EINVAL;
}
aspeed_spi_chip_enable(aspi, cs, true);
chip->ctl_val[ASPEED_SPI_BASE] = CTRL_CE_STOP_ACTIVE | CTRL_IO_MODE_USER;
dev_dbg(aspi->dev, "CE%d setup done\n", cs);
return 0;
}
static void aspeed_spi_cleanup(struct spi_device *spi)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(spi->master);
unsigned int cs = spi->chip_select;
aspeed_spi_chip_enable(aspi, cs, false);
dev_dbg(aspi->dev, "CE%d cleanup done\n", cs);
}
static void aspeed_spi_enable(struct aspeed_spi *aspi, bool enable)
{
int cs;
for (cs = 0; cs < aspi->data->max_cs; cs++)
aspeed_spi_chip_enable(aspi, cs, enable);
}
static int aspeed_spi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct aspeed_spi_data *data;
struct spi_controller *ctlr;
struct aspeed_spi *aspi;
struct resource *res;
int ret;
data = of_device_get_match_data(&pdev->dev);
if (!data)
return -ENODEV;
ctlr = devm_spi_alloc_master(dev, sizeof(*aspi));
if (!ctlr)
return -ENOMEM;
aspi = spi_controller_get_devdata(ctlr);
platform_set_drvdata(pdev, aspi);
aspi->data = data;
aspi->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
aspi->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(aspi->regs)) {
dev_err(dev, "missing AHB register window\n");
return PTR_ERR(aspi->regs);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
aspi->ahb_base = devm_ioremap_resource(dev, res);
if (IS_ERR(aspi->ahb_base)) {
dev_err(dev, "missing AHB mapping window\n");
return PTR_ERR(aspi->ahb_base);
}
aspi->ahb_window_size = resource_size(res);
aspi->ahb_base_phy = res->start;
aspi->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(aspi->clk)) {
dev_err(dev, "missing clock\n");
return PTR_ERR(aspi->clk);
}
aspi->clk_freq = clk_get_rate(aspi->clk);
if (!aspi->clk_freq) {
dev_err(dev, "invalid clock\n");
return -EINVAL;
}
ret = clk_prepare_enable(aspi->clk);
if (ret) {
dev_err(dev, "can not enable the clock\n");
return ret;
}
/* IRQ is for DMA, which the driver doesn't support yet */
ctlr->mode_bits = SPI_RX_DUAL | SPI_TX_DUAL | data->mode_bits;
ctlr->bus_num = pdev->id;
ctlr->mem_ops = &aspeed_spi_mem_ops;
ctlr->setup = aspeed_spi_setup;
ctlr->cleanup = aspeed_spi_cleanup;
ctlr->num_chipselect = data->max_cs;
ctlr->dev.of_node = dev->of_node;
ret = devm_spi_register_controller(dev, ctlr);
if (ret) {
dev_err(&pdev->dev, "spi_register_controller failed\n");
goto disable_clk;
}
return 0;
disable_clk:
clk_disable_unprepare(aspi->clk);
return ret;
}
static int aspeed_spi_remove(struct platform_device *pdev)
{
struct aspeed_spi *aspi = platform_get_drvdata(pdev);
aspeed_spi_enable(aspi, false);
clk_disable_unprepare(aspi->clk);
return 0;
}
/*
* AHB mappings
*/
/*
* The Segment Registers of the AST2400 and AST2500 use a 8MB unit.
* The address range is encoded with absolute addresses in the overall
* mapping window.
*/
static u32 aspeed_spi_segment_start(struct aspeed_spi *aspi, u32 reg)
{
return ((reg >> 16) & 0xFF) << 23;
}
static u32 aspeed_spi_segment_end(struct aspeed_spi *aspi, u32 reg)
{
return ((reg >> 24) & 0xFF) << 23;
}
static u32 aspeed_spi_segment_reg(struct aspeed_spi *aspi, u32 start, u32 end)
{
return (((start >> 23) & 0xFF) << 16) | (((end >> 23) & 0xFF) << 24);
}
/*
* The Segment Registers of the AST2600 use a 1MB unit. The address
* range is encoded with offsets in the overall mapping window.
*/
#define AST2600_SEG_ADDR_MASK 0x0ff00000
static u32 aspeed_spi_segment_ast2600_start(struct aspeed_spi *aspi,
u32 reg)
{
u32 start_offset = (reg << 16) & AST2600_SEG_ADDR_MASK;
return aspi->ahb_base_phy + start_offset;
}
static u32 aspeed_spi_segment_ast2600_end(struct aspeed_spi *aspi,
u32 reg)
{
u32 end_offset = reg & AST2600_SEG_ADDR_MASK;
/* segment is disabled */
if (!end_offset)
return aspi->ahb_base_phy;
return aspi->ahb_base_phy + end_offset + 0x100000;
}
static u32 aspeed_spi_segment_ast2600_reg(struct aspeed_spi *aspi,
u32 start, u32 end)
{
/* disable zero size segments */
if (start == end)
return 0;
return ((start & AST2600_SEG_ADDR_MASK) >> 16) |
((end - 1) & AST2600_SEG_ADDR_MASK);
}
/*
* Read timing compensation sequences
*/
#define CALIBRATE_BUF_SIZE SZ_16K
static bool aspeed_spi_check_reads(struct aspeed_spi_chip *chip,
const u8 *golden_buf, u8 *test_buf)
{
int i;
for (i = 0; i < 10; i++) {
memcpy_fromio(test_buf, chip->ahb_base, CALIBRATE_BUF_SIZE);
if (memcmp(test_buf, golden_buf, CALIBRATE_BUF_SIZE) != 0) {
#if defined(VERBOSE_DEBUG)
print_hex_dump_bytes(DEVICE_NAME " fail: ", DUMP_PREFIX_NONE,
test_buf, 0x100);
#endif
return false;
}
}
return true;
}
#define FREAD_TPASS(i) (((i) / 2) | (((i) & 1) ? 0 : 8))
/*
* The timing register is shared by all devices. Only update for CE0.
*/
static int aspeed_spi_calibrate(struct aspeed_spi_chip *chip, u32 hdiv,
const u8 *golden_buf, u8 *test_buf)
{
struct aspeed_spi *aspi = chip->aspi;
const struct aspeed_spi_data *data = aspi->data;
int i;
int good_pass = -1, pass_count = 0;
u32 shift = (hdiv - 1) << 2;
u32 mask = ~(0xfu << shift);
u32 fread_timing_val = 0;
/* Try HCLK delay 0..5, each one with/without delay and look for a
* good pair.
*/
for (i = 0; i < 12; i++) {
bool pass;
if (chip->cs == 0) {
fread_timing_val &= mask;
fread_timing_val |= FREAD_TPASS(i) << shift;
writel(fread_timing_val, aspi->regs + data->timing);
}
pass = aspeed_spi_check_reads(chip, golden_buf, test_buf);
dev_dbg(aspi->dev,
" * [%08x] %d HCLK delay, %dns DI delay : %s",
fread_timing_val, i / 2, (i & 1) ? 0 : 4,
pass ? "PASS" : "FAIL");
if (pass) {
pass_count++;
if (pass_count == 3) {
good_pass = i - 1;
break;
}
} else {
pass_count = 0;
}
}
/* No good setting for this frequency */
if (good_pass < 0)
return -1;
/* We have at least one pass of margin, let's use first pass */
if (chip->cs == 0) {
fread_timing_val &= mask;
fread_timing_val |= FREAD_TPASS(good_pass) << shift;
writel(fread_timing_val, aspi->regs + data->timing);
}
dev_dbg(aspi->dev, " * -> good is pass %d [0x%08x]",
good_pass, fread_timing_val);
return 0;
}
static bool aspeed_spi_check_calib_data(const u8 *test_buf, u32 size)
{
const u32 *tb32 = (const u32 *)test_buf;
u32 i, cnt = 0;
/* We check if we have enough words that are neither all 0
* nor all 1's so the calibration can be considered valid.
*
* I use an arbitrary threshold for now of 64
*/
size >>= 2;
for (i = 0; i < size; i++) {
if (tb32[i] != 0 && tb32[i] != 0xffffffff)
cnt++;
}
return cnt >= 64;
}
static const u32 aspeed_spi_hclk_divs[] = {
0xf, /* HCLK */
0x7, /* HCLK/2 */
0xe, /* HCLK/3 */
0x6, /* HCLK/4 */
0xd, /* HCLK/5 */
};
#define ASPEED_SPI_HCLK_DIV(i) \
(aspeed_spi_hclk_divs[(i) - 1] << CTRL_FREQ_SEL_SHIFT)
static int aspeed_spi_do_calibration(struct aspeed_spi_chip *chip)
{
struct aspeed_spi *aspi = chip->aspi;
const struct aspeed_spi_data *data = aspi->data;
u32 ahb_freq = aspi->clk_freq;
u32 max_freq = chip->clk_freq;
u32 ctl_val;
u8 *golden_buf = NULL;
u8 *test_buf = NULL;
int i, rc, best_div = -1;
dev_dbg(aspi->dev, "calculate timing compensation - AHB freq: %d MHz",
ahb_freq / 1000000);
/*
* use the related low frequency to get check calibration data
* and get golden data.
*/
ctl_val = chip->ctl_val[ASPEED_SPI_READ] & data->hclk_mask;
writel(ctl_val, chip->ctl);
test_buf = kzalloc(CALIBRATE_BUF_SIZE * 2, GFP_KERNEL);
if (!test_buf)
return -ENOMEM;
golden_buf = test_buf + CALIBRATE_BUF_SIZE;
memcpy_fromio(golden_buf, chip->ahb_base, CALIBRATE_BUF_SIZE);
if (!aspeed_spi_check_calib_data(golden_buf, CALIBRATE_BUF_SIZE)) {
dev_info(aspi->dev, "Calibration area too uniform, using low speed");
goto no_calib;
}
#if defined(VERBOSE_DEBUG)
print_hex_dump_bytes(DEVICE_NAME " good: ", DUMP_PREFIX_NONE,
golden_buf, 0x100);
#endif
/* Now we iterate the HCLK dividers until we find our breaking point */
for (i = ARRAY_SIZE(aspeed_spi_hclk_divs); i > data->hdiv_max - 1; i--) {
u32 tv, freq;
freq = ahb_freq / i;
if (freq > max_freq)
continue;
/* Set the timing */
tv = chip->ctl_val[ASPEED_SPI_READ] | ASPEED_SPI_HCLK_DIV(i);
writel(tv, chip->ctl);
dev_dbg(aspi->dev, "Trying HCLK/%d [%08x] ...", i, tv);
rc = data->calibrate(chip, i, golden_buf, test_buf);
if (rc == 0)
best_div = i;
}
/* Nothing found ? */
if (best_div < 0) {
dev_warn(aspi->dev, "No good frequency, using dumb slow");
} else {
dev_dbg(aspi->dev, "Found good read timings at HCLK/%d", best_div);
/* Record the freq */
for (i = 0; i < ASPEED_SPI_MAX; i++)
chip->ctl_val[i] = (chip->ctl_val[i] & data->hclk_mask) |
ASPEED_SPI_HCLK_DIV(best_div);
}
no_calib:
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
kfree(test_buf);
return 0;
}
#define TIMING_DELAY_DI BIT(3)
#define TIMING_DELAY_HCYCLE_MAX 5
#define TIMING_REG_AST2600(chip) \
((chip)->aspi->regs + (chip)->aspi->data->timing + \
(chip)->cs * 4)
static int aspeed_spi_ast2600_calibrate(struct aspeed_spi_chip *chip, u32 hdiv,
const u8 *golden_buf, u8 *test_buf)
{
struct aspeed_spi *aspi = chip->aspi;
int hcycle;
u32 shift = (hdiv - 2) << 3;
u32 mask = ~(0xfu << shift);
u32 fread_timing_val = 0;
for (hcycle = 0; hcycle <= TIMING_DELAY_HCYCLE_MAX; hcycle++) {
int delay_ns;
bool pass = false;
fread_timing_val &= mask;
fread_timing_val |= hcycle << shift;
/* no DI input delay first */
writel(fread_timing_val, TIMING_REG_AST2600(chip));
pass = aspeed_spi_check_reads(chip, golden_buf, test_buf);
dev_dbg(aspi->dev,
" * [%08x] %d HCLK delay, DI delay none : %s",
fread_timing_val, hcycle, pass ? "PASS" : "FAIL");
if (pass)
return 0;
/* Add DI input delays */
fread_timing_val &= mask;
fread_timing_val |= (TIMING_DELAY_DI | hcycle) << shift;
for (delay_ns = 0; delay_ns < 0x10; delay_ns++) {
fread_timing_val &= ~(0xf << (4 + shift));
fread_timing_val |= delay_ns << (4 + shift);
writel(fread_timing_val, TIMING_REG_AST2600(chip));
pass = aspeed_spi_check_reads(chip, golden_buf, test_buf);
dev_dbg(aspi->dev,
" * [%08x] %d HCLK delay, DI delay %d.%dns : %s",
fread_timing_val, hcycle, (delay_ns + 1) / 2,
(delay_ns + 1) & 1 ? 5 : 5, pass ? "PASS" : "FAIL");
/*
* TODO: This is optimistic. We should look
* for a working interval and save the middle
* value in the read timing register.
*/
if (pass)
return 0;
}
}
/* No good setting for this frequency */
return -1;
}
/*
* Platform definitions
*/
static const struct aspeed_spi_data ast2400_fmc_data = {
.max_cs = 5,
.hastype = true,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xfffff0ff,
.hdiv_max = 1,
.calibrate = aspeed_spi_calibrate,
.segment_start = aspeed_spi_segment_start,
.segment_end = aspeed_spi_segment_end,
.segment_reg = aspeed_spi_segment_reg,
};
static const struct aspeed_spi_data ast2400_spi_data = {
.max_cs = 1,
.hastype = false,
.we0 = 0,
.ctl0 = 0x04,
.timing = 0x14,
.hclk_mask = 0xfffff0ff,
.hdiv_max = 1,
.calibrate = aspeed_spi_calibrate,
/* No segment registers */
};
static const struct aspeed_spi_data ast2500_fmc_data = {
.max_cs = 3,
.hastype = true,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xffffd0ff,
.hdiv_max = 1,
.calibrate = aspeed_spi_calibrate,
.segment_start = aspeed_spi_segment_start,
.segment_end = aspeed_spi_segment_end,
.segment_reg = aspeed_spi_segment_reg,
};
static const struct aspeed_spi_data ast2500_spi_data = {
.max_cs = 2,
.hastype = false,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xffffd0ff,
.hdiv_max = 1,
.calibrate = aspeed_spi_calibrate,
.segment_start = aspeed_spi_segment_start,
.segment_end = aspeed_spi_segment_end,
.segment_reg = aspeed_spi_segment_reg,
};
static const struct aspeed_spi_data ast2600_fmc_data = {
.max_cs = 3,
.hastype = false,
.mode_bits = SPI_RX_QUAD | SPI_RX_QUAD,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xf0fff0ff,
.hdiv_max = 2,
.calibrate = aspeed_spi_ast2600_calibrate,
.segment_start = aspeed_spi_segment_ast2600_start,
.segment_end = aspeed_spi_segment_ast2600_end,
.segment_reg = aspeed_spi_segment_ast2600_reg,
};
static const struct aspeed_spi_data ast2600_spi_data = {
.max_cs = 2,
.hastype = false,
.mode_bits = SPI_RX_QUAD | SPI_RX_QUAD,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xf0fff0ff,
.hdiv_max = 2,
.calibrate = aspeed_spi_ast2600_calibrate,
.segment_start = aspeed_spi_segment_ast2600_start,
.segment_end = aspeed_spi_segment_ast2600_end,
.segment_reg = aspeed_spi_segment_ast2600_reg,
};
static const struct of_device_id aspeed_spi_matches[] = {
{ .compatible = "aspeed,ast2400-fmc", .data = &ast2400_fmc_data },
{ .compatible = "aspeed,ast2400-spi", .data = &ast2400_spi_data },
{ .compatible = "aspeed,ast2500-fmc", .data = &ast2500_fmc_data },
{ .compatible = "aspeed,ast2500-spi", .data = &ast2500_spi_data },
{ .compatible = "aspeed,ast2600-fmc", .data = &ast2600_fmc_data },
{ .compatible = "aspeed,ast2600-spi", .data = &ast2600_spi_data },
{ }
};
MODULE_DEVICE_TABLE(of, aspeed_spi_matches);
static struct platform_driver aspeed_spi_driver = {
.probe = aspeed_spi_probe,
.remove = aspeed_spi_remove,
.driver = {
.name = DEVICE_NAME,
.of_match_table = aspeed_spi_matches,
}
};
module_platform_driver(aspeed_spi_driver);
MODULE_DESCRIPTION("ASPEED Static Memory Controller Driver");
MODULE_AUTHOR("Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>");
MODULE_AUTHOR("Cedric Le Goater <clg@kaod.org>");
MODULE_LICENSE("GPL v2");
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