* [PATCH v4 2/3] clk: meson: add a driver for the Meson8/8b/8m2 SDHC clock controller
2020-01-12 0:24 [PATCH v4 0/3] Amlogic 32-bit Meson SoC SDHC MMC controller driver Martin Blumenstingl
2020-01-12 0:24 ` [PATCH v4 1/3] dt-bindings: mmc: Document the Amlogic Meson SDHC MMC host controller Martin Blumenstingl
@ 2020-01-12 0:24 ` Martin Blumenstingl
2020-01-12 0:24 ` [PATCH v4 3/3] mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host Martin Blumenstingl
2 siblings, 0 replies; 6+ messages in thread
From: Martin Blumenstingl @ 2020-01-12 0:24 UTC (permalink / raw)
To: linux-amlogic, devicetree, linux-mmc, ulf.hansson, robh+dt
Cc: mark.rutland, jianxin.pan, Martin Blumenstingl, linux-kernel,
yinxin_1989, linux-arm-kernel, lnykww
The SDHC (MMC) controller embeds a clock controller inside one of the
SDHC registers. The outputs of thisclock controller are dedicated to the
SDHC controller.
Implement a dedicated clock controller driver so we can keep all the
clock specific logic outside of the MMC controller driver. There is no
dedicated clock controller OF node because the hardware is a big SDHC IP
block with an embedded clock controller (so the .dts doesn't need a
separate clock controller node). Instead this driver re-uses the regmap
as registered by the (platform_device) parent.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
drivers/clk/meson/Kconfig | 9 ++
drivers/clk/meson/Makefile | 1 +
drivers/clk/meson/meson-mx-sdhc.c | 212 ++++++++++++++++++++++++++++++
3 files changed, 222 insertions(+)
create mode 100644 drivers/clk/meson/meson-mx-sdhc.c
diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
index dabeb435d067..8769335d2d46 100644
--- a/drivers/clk/meson/Kconfig
+++ b/drivers/clk/meson/Kconfig
@@ -53,6 +53,15 @@ config COMMON_CLK_MESON8B
S805 (Meson8b) and S812 (Meson8m2) devices. Say Y if you
want peripherals and CPU frequency scaling to work.
+config COMMON_CLK_MESON_MX_SDHC
+ tristate "Meson MX SDHC MMC Clock Controller Driver"
+ depends on ARCH_MESON
+ select COMMON_CLK_MESON_REGMAP
+ help
+ Support for the SDHC clock controller on Amlogic Meson8/8b/8m2 SoCs
+ devices. Say Y or M if you want to use the SDHC MMC controller.
+ Otherwise say N.
+
config COMMON_CLK_GXBB
bool
depends on ARCH_MESON
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index 6eca2a406ee3..b71c7ae78dbd 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o
obj-$(CONFIG_COMMON_CLK_G12A) += g12a.o g12a-aoclk.o
obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o meson8-ddr.o
+obj-$(CONFIG_COMMON_CLK_MESON_MX_SDHC) += meson-mx-sdhc.o
diff --git a/drivers/clk/meson/meson-mx-sdhc.c b/drivers/clk/meson/meson-mx-sdhc.c
new file mode 100644
index 000000000000..b98a35d99f65
--- /dev/null
+++ b/drivers/clk/meson/meson-mx-sdhc.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Amlogic Meson SDHC clock controller
+ *
+ * Copyright (C) 2019 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ */
+
+#include <dt-bindings/clock/meson-mx-sdhc-clkc.h>
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "clk-regmap.h"
+#include "clk-pll.h"
+
+#define MESON_SDHC_CLKC 0x10
+
+static const struct clk_regmap meson_mx_sdhc_src_sel = {
+ .data = &(struct clk_regmap_mux_data){
+ .offset = MESON_SDHC_CLKC,
+ .mask = 0x3,
+ .shift = 16,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sdhc_src_sel",
+ .ops = &clk_regmap_mux_ops,
+ .parent_data = (const struct clk_parent_data[]) {
+ { .fw_name = "clkin0", .index = -1, },
+ { .fw_name = "clkin1", .index = -1, },
+ { .fw_name = "clkin2", .index = -1, },
+ { .fw_name = "clkin3", .index = -1, },
+ },
+ .num_parents = 4,
+ },
+};
+
+static const struct clk_div_table meson_mx_sdhc_div_table[] = {
+ { .div = 6, .val = 5, },
+ { .div = 8, .val = 7, },
+ { .div = 9, .val = 8, },
+ { .div = 10, .val = 9, },
+ { .div = 12, .val = 11, },
+ { .div = 16, .val = 15, },
+ { .div = 18, .val = 17, },
+ { .div = 34, .val = 33, },
+ { .div = 142, .val = 141, },
+ { .div = 850, .val = 849, },
+ { .div = 2126, .val = 2125, },
+ { .div = 4096, .val = 4095, },
+ { /* sentinel */ }
+};
+
+static const struct clk_regmap meson_mx_sdhc_div = {
+ .data = &(struct clk_regmap_div_data){
+ .offset = MESON_SDHC_CLKC,
+ .shift = 0,
+ .width = 12,
+ .table = meson_mx_sdhc_div_table,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sdhc_div",
+ .ops = &clk_regmap_divider_ops,
+ .parent_data = (const struct clk_parent_data[]) {
+ { .name = "sdhc_src_sel", .index = -1, },
+ },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_PARENT,
+ },
+};
+
+static const struct clk_regmap meson_mx_sdhc_mod_clk_en = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = MESON_SDHC_CLKC,
+ .bit_idx = 15,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sdhc_mod_clk_on",
+ .ops = &clk_regmap_gate_ops,
+ .parent_data = (const struct clk_parent_data[]) {
+ { .name = "sdhc_div", .index = -1, },
+ },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_GATE,
+ },
+};
+
+static const struct clk_regmap meson_mx_sdhc_tx_clk_en = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = MESON_SDHC_CLKC,
+ .bit_idx = 14,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sdhc_tx_clk_on",
+ .ops = &clk_regmap_gate_ops,
+ .parent_data = (const struct clk_parent_data[]) {
+ { .name = "sdhc_div", .index = -1, },
+ },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_GATE,
+ },
+};
+
+static const struct clk_regmap meson_mx_sdhc_rx_clk_en = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = MESON_SDHC_CLKC,
+ .bit_idx = 13,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sdhc_rx_clk_on",
+ .ops = &clk_regmap_gate_ops,
+ .parent_data = (const struct clk_parent_data[]) {
+ { .name = "sdhc_div", .index = -1, },
+ },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
+ },
+};
+
+static const struct clk_regmap meson_mx_sdhc_sd_clk_en = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = MESON_SDHC_CLKC,
+ .bit_idx = 12,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sdhc_sd_clk_on",
+ .ops = &clk_regmap_gate_ops,
+ .parent_data = (const struct clk_parent_data[]) {
+ { .name = "sdhc_div", .index = -1, },
+ },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
+ },
+};
+
+static const struct clk_regmap *meson_mx_sdhc_clk_regmaps[] = {
+ [SDHC_CLKID_SRC_SEL] = &meson_mx_sdhc_src_sel,
+ [SDHC_CLKID_DIV] = &meson_mx_sdhc_div,
+ [SDHC_CLKID_MOD_CLK] = &meson_mx_sdhc_mod_clk_en,
+ [SDHC_CLKID_SD_CLK] = &meson_mx_sdhc_sd_clk_en,
+ [SDHC_CLKID_TX_CLK] = &meson_mx_sdhc_tx_clk_en,
+ [SDHC_CLKID_RX_CLK] = &meson_mx_sdhc_rx_clk_en,
+};
+
+#define MESON_MX_SDHC_NUM_CLKS ARRAY_SIZE(meson_mx_sdhc_clk_regmaps)
+
+static int meson_mx_sdhc_clkc_probe(struct platform_device *pdev)
+{
+ struct device *parent = pdev->dev.parent;
+ struct clk_hw_onecell_data *onecell_data;
+ struct clk_regmap *clk_regmap;
+ struct regmap *regmap;
+ int i, ret;
+
+ regmap = dev_get_regmap(parent, NULL);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ clk_regmap = devm_kcalloc(parent, sizeof(*clk_regmap),
+ MESON_MX_SDHC_NUM_CLKS, GFP_KERNEL);
+ if (!clk_regmap)
+ return -ENOMEM;
+
+ onecell_data = devm_kzalloc(parent,
+ struct_size(onecell_data, hws,
+ MESON_MX_SDHC_NUM_CLKS),
+ GFP_KERNEL);
+ if (!onecell_data)
+ return -ENOMEM;
+
+ for (i = 0; i < MESON_MX_SDHC_NUM_CLKS; i++) {
+ memcpy(&clk_regmap[i], meson_mx_sdhc_clk_regmaps[i],
+ sizeof(*clk_regmap));
+
+ clk_regmap[i].map = regmap;
+ onecell_data->hws[i] = &clk_regmap[i].hw;
+
+ ret = devm_clk_hw_register(parent, onecell_data->hws[i]);
+ if (ret) {
+ dev_err(parent,
+ "Registration of SDHC clock %d failed\n", i);
+ return ret;
+ }
+ }
+
+ onecell_data->num = MESON_MX_SDHC_NUM_CLKS;
+
+ return devm_of_clk_add_hw_provider(parent, of_clk_hw_onecell_get,
+ onecell_data);
+}
+
+static const struct platform_device_id meson_mx_sdhc_clkc_ids[] = {
+ { "meson8-sdhc-clkc" },
+ { "meson8b-sdhc-clkc" },
+ { "meson8m2-sdhc-clkc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, meson_mx_sdhc_clkc_ids);
+
+static struct platform_driver meson_mx_sdhc_clkc_driver = {
+ .id_table = meson_mx_sdhc_clkc_ids,
+ .probe = meson_mx_sdhc_clkc_probe,
+ .driver = {
+ .name = "meson-mx-sdhc-clkc",
+ },
+};
+module_platform_driver(meson_mx_sdhc_clkc_driver);
+
+MODULE_DESCRIPTION("Amlogic Meson8/8b/8m2 SDHC clock controller driver");
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_LICENSE("GPL v2");
--
2.24.1
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v4 3/3] mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host
2020-01-12 0:24 [PATCH v4 0/3] Amlogic 32-bit Meson SoC SDHC MMC controller driver Martin Blumenstingl
2020-01-12 0:24 ` [PATCH v4 1/3] dt-bindings: mmc: Document the Amlogic Meson SDHC MMC host controller Martin Blumenstingl
2020-01-12 0:24 ` [PATCH v4 2/3] clk: meson: add a driver for the Meson8/8b/8m2 SDHC clock controller Martin Blumenstingl
@ 2020-01-12 0:24 ` Martin Blumenstingl
2 siblings, 0 replies; 6+ messages in thread
From: Martin Blumenstingl @ 2020-01-12 0:24 UTC (permalink / raw)
To: linux-amlogic, devicetree, linux-mmc, ulf.hansson, robh+dt
Cc: mark.rutland, jianxin.pan, Martin Blumenstingl, linux-kernel,
yinxin_1989, linux-arm-kernel, lnykww
The SDHC MMC host controller on Amlogic SoCs provides an eMMC and MMC
card interface with 1/4/8-bit bus width.
It supports eMMC spec 4.4x/4.5x including HS200 (up to 100MHz clock).
The public S805 datasheet [0] contains a short documentation about the
registers. Unfortunately it does not describe how to use the registers
to make the hardware work. Thus this driver is based on reading (and
understanding) the Amlogic 3.10 GPL kernel code.
Some hardware details are not easy to see. Jianxin Pan was kind enough
to answer my questions:
The hardware has built-in busy timeout support. The maximum timeout is
30 seconds. This is only documented in Amlogic's internal
documentation.
The controller only works with very specific clock configurations. The
details are not part of the public datasheet. In my own words the
supported configurations are:
- 399.812kHz: clkin = 850MHz div = 2126 sd_rx_phase = 63
- 1MHz: clkin = 850MHz div = 850 sd_rx_phase = 55
- 5.986MHz: clkin = 850MHz div = 142 sd_rx_phase = 24
- 25MHz: clkin = 850MHz div = 34 sd_rx_phase = 15
- 47.222MHz: clkin = 850MHz div = 18 sd_rx_phase = 11/15 (SDR50/HS)
- 53.125MHz: clkin = 850MHz div = 16 sd_rx_phase = (tuning)
- 70.833MHz: clkin = 850MHz div = 12 sd_rx_phase = (tuning)
- 85MHz: clkin = 850MHz div = 10 sd_rx_phase = (tuning)
- 94.44MHz: clkin = 850MHz div = 9 sd_rx_phase = (tuning)
- 106.25MHz: clkin = 850MHz div = 8 sd_rx_phase = (tuning)
- 127.5MHz: clkin = 1275MHz div = 10 sd_rx_phase = (tuning)
- 141.667MHz: clkin = 850MHz div = 6 sd_rx_phase = (tuning)
- 159.375MHz: clkin = 1275MHz div = 8 sd_rx_phase = (tuning)
- 212.5MHz: clkin = 1275MHz div = 6 sd_rx_phase = (tuning)
- (sd_tx_phase is always 1, 94.44MHz is not listed in the datasheet
but this is what the 3.10 BSP kernel on Odroid-C1 actually uses)
NOTE: CMD23 support is disabled for now because it results in command
timeouts and thus decreases read performance.
Tested-by: Wei Wang <lnykww@gmail.com>
Tested-by: Xin Yin <yinxin_1989@aliyun.com>
Reviewed-by: Xin Yin <yinxin_1989@aliyun.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
drivers/mmc/host/Kconfig | 14 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/meson-mx-sdhc.c | 1064 ++++++++++++++++++++++++++++++
3 files changed, 1079 insertions(+)
create mode 100644 drivers/mmc/host/meson-mx-sdhc.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index d06b2dfe3c95..23d24aad1145 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -405,6 +405,20 @@ config MMC_MESON_GX
If you have a controller with this interface, say Y here.
+config MMC_MESON_MX_SDHC
+ tristate "Amlogic Meson SDHC Host Controller support"
+ depends on (ARM && ARCH_MESON) || COMPILE_TEST
+ depends on OF
+ imply COMMON_CLK_MESON_MX_SDHC
+ help
+ This selects support for the SDHC Host Controller on
+ Amlogic Meson6, Meson8, Meson8b and Meson8m2 SoCs.
+ The controller supports the SD/SDIO Spec 3.x and eMMC Spec 4.5x
+ with 1, 4, and 8 bit bus widths.
+
+ If you have a controller with this interface, say Y or M here.
+ If unsure, say N.
+
config MMC_MESON_MX_SDIO
tristate "Amlogic Meson6/Meson8/Meson8b SD/MMC Host Controller support"
depends on ARCH_MESON || COMPILE_TEST
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 21d9089e5eda..9a0c22a8139a 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_MMC_VUB300) += vub300.o
obj-$(CONFIG_MMC_USHC) += ushc.o
obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o
obj-$(CONFIG_MMC_MESON_GX) += meson-gx-mmc.o
+obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc.o
obj-$(CONFIG_MMC_MESON_MX_SDIO) += meson-mx-sdio.o
obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o
obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o
diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc.c
new file mode 100644
index 000000000000..b92400ee488b
--- /dev/null
+++ b/drivers/mmc/host/meson-mx-sdhc.c
@@ -0,0 +1,1064 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
+ *
+ * Copyright (C) 2019 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/slot-gpio.h>
+
+#define MESON_SDHC_ARGU 0x00
+
+#define MESON_SDHC_SEND 0x04
+ #define MESON_SDHC_SEND_CMD_INDEX GENMASK(5, 0)
+ #define MESON_SDHC_SEND_CMD_HAS_RESP BIT(6)
+ #define MESON_SDHC_SEND_CMD_HAS_DATA BIT(7)
+ #define MESON_SDHC_SEND_RESP_LEN BIT(8)
+ #define MESON_SDHC_SEND_RESP_NO_CRC BIT(9)
+ #define MESON_SDHC_SEND_DATA_DIR BIT(10)
+ #define MESON_SDHC_SEND_DATA_STOP BIT(11)
+ #define MESON_SDHC_SEND_R1B BIT(12)
+ #define MESON_SDHC_SEND_TOTAL_PACK GENMASK(31, 16)
+
+#define MESON_SDHC_CTRL 0x08
+ #define MESON_SDHC_CTRL_DAT_TYPE GENMASK(1, 0)
+ #define MESON_SDHC_CTRL_DDR_MODE BIT(2)
+ #define MESON_SDHC_CTRL_TX_CRC_NOCHECK BIT(3)
+ #define MESON_SDHC_CTRL_PACK_LEN GENMASK(12, 4)
+ #define MESON_SDHC_CTRL_RX_TIMEOUT GENMASK(19, 13)
+ #define MESON_SDHC_CTRL_RX_PERIOD GENMASK(23, 20)
+ #define MESON_SDHC_CTRL_RX_ENDIAN GENMASK(26, 24)
+ #define MESON_SDHC_CTRL_SDIO_IRQ_MODE BIT(27)
+ #define MESON_SDHC_CTRL_DAT0_IRQ_SEL BIT(28)
+ #define MESON_SDHC_CTRL_TX_ENDIAN GENMASK(31, 29)
+
+#define MESON_SDHC_STAT 0x0c
+ #define MESON_SDHC_STAT_CMD_BUSY BIT(0)
+ #define MESON_SDHC_STAT_DAT3_0 GENMASK(4, 1)
+ #define MESON_SDHC_STAT_CMD BIT(5)
+ #define MESON_SDHC_STAT_RXFIFO_CNT GENMASK(12, 6)
+ #define MESON_SDHC_STAT_TXFIFO_CNT GENMASK(19, 13)
+ #define MESON_SDHC_STAT_DAT7_4 GENMASK(23, 20)
+
+#define MESON_SDHC_CLKC 0x10
+ #define MESON_SDHC_CLKC_CLK_DIV GENMASK(11, 0)
+ #define MESON_SDHC_CLKC_CLK_JIC BIT(24)
+ #define MESON_SDHC_CLKC_MEM_PWR_OFF GENMASK(26, 25)
+
+#define MESON_SDHC_ADDR 0x14
+
+#define MESON_SDHC_PDMA 0x18
+ #define MESON_SDHC_PDMA_DMA_MODE BIT(0)
+ #define MESON_SDHC_PDMA_PIO_RDRESP GENMASK(3, 1)
+ #define MESON_SDHC_PDMA_DMA_URGENT BIT(4)
+ #define MESON_SDHC_PDMA_WR_BURST GENMASK(9, 5)
+ #define MESON_SDHC_PDMA_RD_BURST GENMASK(14, 10)
+ #define MESON_SDHC_PDMA_RXFIFO_TH GENMASK(21, 15)
+ #define MESON_SDHC_PDMA_TXFIFO_TH GENMASK(28, 22)
+ #define MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH GENMASK(30, 29)
+ #define MESON_SDHC_PDMA_TXFIFO_FILL BIT(31)
+
+#define MESON_SDHC_MISC 0x1c
+ #define MESON_SDHC_MISC_WCRC_ERR_PATT GENMASK(6, 4)
+ #define MESON_SDHC_MISC_WCRC_OK_PATT GENMASK(9, 7)
+ #define MESON_SDHC_MISC_BURST_NUM GENMASK(21, 16)
+ #define MESON_SDHC_MISC_THREAD_ID GENMASK(27, 22)
+ #define MESON_SDHC_MISC_MANUAL_STOP BIT(28)
+ #define MESON_SDHC_MISC_TXSTART_THRES GENMASK(31, 29)
+
+#define MESON_SDHC_DATA 0x20
+
+#define MESON_SDHC_ICTL 0x24
+ #define MESON_SDHC_ICTL_RESP_OK BIT(0)
+ #define MESON_SDHC_ICTL_RESP_TIMEOUT BIT(1)
+ #define MESON_SDHC_ICTL_RESP_ERR_CRC BIT(2)
+ #define MESON_SDHC_ICTL_RESP_OK_NOCLEAR BIT(3)
+ #define MESON_SDHC_ICTL_DATA_1PACK_OK BIT(4)
+ #define MESON_SDHC_ICTL_DATA_TIMEOUT BIT(5)
+ #define MESON_SDHC_ICTL_DATA_ERR_CRC BIT(6)
+ #define MESON_SDHC_ICTL_DATA_XFER_OK BIT(7)
+ #define MESON_SDHC_ICTL_RX_HIGHER BIT(8)
+ #define MESON_SDHC_ICTL_RX_LOWER BIT(9)
+ #define MESON_SDHC_ICTL_DAT1_IRQ BIT(10)
+ #define MESON_SDHC_ICTL_DMA_DONE BIT(11)
+ #define MESON_SDHC_ICTL_RXFIFO_FULL BIT(12)
+ #define MESON_SDHC_ICTL_TXFIFO_EMPTY BIT(13)
+ #define MESON_SDHC_ICTL_ADDI_DAT1_IRQ BIT(14)
+ #define MESON_SDHC_ICTL_ALL_IRQS GENMASK(14, 0)
+ #define MESON_SDHC_ICTL_DAT1_IRQ_DELAY GENMASK(17, 16)
+
+#define MESON_SDHC_ISTA 0x28
+ #define MESON_SDHC_ISTA_RESP_OK BIT(0)
+ #define MESON_SDHC_ISTA_RESP_TIMEOUT BIT(1)
+ #define MESON_SDHC_ISTA_RESP_ERR_CRC BIT(2)
+ #define MESON_SDHC_ISTA_RESP_OK_NOCLEAR BIT(3)
+ #define MESON_SDHC_ISTA_DATA_1PACK_OK BIT(4)
+ #define MESON_SDHC_ISTA_DATA_TIMEOUT BIT(5)
+ #define MESON_SDHC_ISTA_DATA_ERR_CRC BIT(6)
+ #define MESON_SDHC_ISTA_DATA_XFER_OK BIT(7)
+ #define MESON_SDHC_ISTA_RX_HIGHER BIT(8)
+ #define MESON_SDHC_ISTA_RX_LOWER BIT(9)
+ #define MESON_SDHC_ISTA_DAT1_IRQ BIT(10)
+ #define MESON_SDHC_ISTA_DMA_DONE BIT(11)
+ #define MESON_SDHC_ISTA_RXFIFO_FULL BIT(12)
+ #define MESON_SDHC_ISTA_TXFIFO_EMPTY BIT(13)
+ #define MESON_SDHC_ISTA_ADDI_DAT1_IRQ BIT(14)
+ #define MESON_SDHC_ISTA_ALL_IRQS GENMASK(14, 0)
+
+#define MESON_SDHC_SRST 0x2c
+ #define MESON_SDHC_SRST_MAIN_CTRL BIT(0)
+ #define MESON_SDHC_SRST_RXFIFO BIT(1)
+ #define MESON_SDHC_SRST_TXFIFO BIT(2)
+ #define MESON_SDHC_SRST_DPHY_RX BIT(3)
+ #define MESON_SDHC_SRST_DPHY_TX BIT(4)
+ #define MESON_SDHC_SRST_DMA_IF BIT(5)
+
+#define MESON_SDHC_ESTA 0x30
+ #define MESON_SDHC_ESTA_11_13 GENMASK(13, 11)
+
+#define MESON_SDHC_ENHC 0x34
+ #define MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE BIT(0)
+ #define MESON_SDHC_ENHC_MESON8M2_CHK_WRRSP BIT(1)
+ #define MESON_SDHC_ENHC_MESON8M2_CHK_DMA BIT(2)
+ #define MESON_SDHC_ENHC_MESON8M2_DEBUG GENMASK(5, 3)
+ #define MESON_SDHC_ENHC_MESON6_RX_TIMEOUT GENMASK(7, 0)
+ #define MESON_SDHC_ENHC_MESON6_DMA_RD_RESP BIT(16)
+ #define MESON_SDHC_ENHC_MESON6_DMA_WR_RESP BIT(17)
+ #define MESON_SDHC_ENHC_SDIO_IRQ_PERIOD GENMASK(15, 8)
+ #define MESON_SDHC_ENHC_RXFIFO_TH GENMASK(24, 18)
+ #define MESON_SDHC_ENHC_TXFIFO_TH GENMASK(31, 25)
+
+#define MESON_SDHC_CLK2 0x38
+ #define MESON_SDHC_CLK2_RX_CLK_PHASE GENMASK(11, 0)
+ #define MESON_SDHC_CLK2_SD_CLK_PHASE GENMASK(23, 12)
+
+#define MESON_SDHC_NUM_BULK_CLKS 4
+#define MESON_SDHC_MAX_BLK_SIZE 512
+#define MESON_SDHC_NUM_TUNING_TRIES 10
+
+struct meson_mx_sdhc_data {
+ void (*init_hw)(struct mmc_host *mmc);
+ void (*set_pdma)(struct mmc_host *mmc);
+ void (*wait_before_send)(struct mmc_host *mmc);
+ bool hardware_flush_all_cmds;
+ const char *clkc_name;
+};
+
+struct meson_mx_sdhc_host {
+ struct mmc_host *mmc;
+
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ int error;
+
+ struct regmap *regmap;
+
+ struct platform_device *clkc_pdev;
+ struct clk *pclk;
+ struct clk *sd_clk;
+ struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS];
+ bool bulk_clks_enabled;
+
+ const struct meson_mx_sdhc_data *platform;
+};
+
+static const struct regmap_config meson_mx_sdhc_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = MESON_SDHC_CLK2,
+};
+
+static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL |
+ MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO |
+ MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX |
+ MESON_SDHC_SRST_DMA_IF);
+ usleep_range(10, 100);
+
+ regmap_write(host->regmap, MESON_SDHC_SRST, 0);
+ usleep_range(10, 100);
+}
+
+static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 stat;
+
+ regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+ if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) &&
+ !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
+ return;
+
+ regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO |
+ MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL);
+ udelay(5);
+
+ regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+ if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) ||
+ FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
+ dev_warn(mmc_dev(host->mmc),
+ "Failed to clear FIFOs, RX: %lu, TX: %lu\n",
+ FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat),
+ FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat));
+}
+
+static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 stat, esta;
+ int ret;
+
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat,
+ !(stat & MESON_SDHC_STAT_CMD_BUSY), 1,
+ 100000);
+ if (ret) {
+ dev_warn(mmc_dev(mmc),
+ "Failed to poll for CMD_BUSY while processing CMD%d\n",
+ host->cmd->opcode);
+ meson_mx_sdhc_hw_reset(mmc);
+ }
+
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta,
+ !(esta & MESON_SDHC_ESTA_11_13), 1,
+ 100000);
+ if (ret) {
+ dev_warn(mmc_dev(mmc),
+ "Failed to poll for ESTA[13:11] while processing CMD%d\n",
+ host->cmd->opcode);
+ meson_mx_sdhc_hw_reset(mmc);
+ }
+}
+
+static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
+ struct mmc_command *cmd)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 ictl, send;
+ int pack_len;
+
+ host->cmd = cmd;
+
+ ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC |
+ MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY |
+ MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC;
+
+ send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode);
+
+ if (cmd->data) {
+ send |= MESON_SDHC_SEND_CMD_HAS_DATA;
+ send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK,
+ cmd->data->blocks - 1);
+
+ if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE)
+ pack_len = cmd->data->blksz;
+ else
+ pack_len = 0;
+
+ if (cmd->data->flags & MMC_DATA_WRITE)
+ send |= MESON_SDHC_SEND_DATA_DIR;
+
+ /*
+ * If command with no data, just wait response done
+ * interrupt(int[0]), and if command with data transfer, just
+ * wait dma done interrupt(int[11]), don't need care about
+ * dat0 busy or not.
+ */
+ if (host->platform->hardware_flush_all_cmds ||
+ cmd->data->flags & MMC_DATA_WRITE)
+ /* hardware flush: */
+ ictl |= MESON_SDHC_ICTL_DMA_DONE;
+ else
+ /* software flush: */
+ ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
+ } else {
+ pack_len = 0;
+
+ ictl |= MESON_SDHC_ICTL_RESP_OK;
+ }
+
+ if (cmd->opcode == MMC_STOP_TRANSMISSION)
+ send |= MESON_SDHC_SEND_DATA_STOP;
+
+ if (cmd->flags & MMC_RSP_PRESENT)
+ send |= MESON_SDHC_SEND_CMD_HAS_RESP;
+
+ if (cmd->flags & MMC_RSP_136) {
+ send |= MESON_SDHC_SEND_RESP_LEN;
+ send |= MESON_SDHC_SEND_RESP_NO_CRC;
+ }
+
+ if (!(cmd->flags & MMC_RSP_CRC))
+ send |= MESON_SDHC_SEND_RESP_NO_CRC;
+
+ if (cmd->flags & MMC_RSP_BUSY)
+ send |= MESON_SDHC_SEND_R1B;
+
+ /* enable the new IRQs and mask all pending ones */
+ regmap_write(host->regmap, MESON_SDHC_ICTL, ictl);
+ regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
+
+ regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg);
+
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_PACK_LEN,
+ FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len));
+
+ if (cmd->data)
+ regmap_write(host->regmap, MESON_SDHC_ADDR,
+ sg_dma_address(cmd->data->sg));
+
+ meson_mx_sdhc_wait_cmd_ready(mmc);
+
+ if (cmd->data)
+ host->platform->set_pdma(mmc);
+
+ if (host->platform->wait_before_send)
+ host->platform->wait_before_send(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_SEND, send);
+}
+
+static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ if (!host->bulk_clks_enabled)
+ return;
+
+ clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks);
+
+ host->bulk_clks_enabled = false;
+}
+
+static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ int ret;
+
+ if (host->bulk_clks_enabled)
+ return 0;
+
+ ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS,
+ host->bulk_clks);
+ if (ret)
+ return ret;
+
+ host->bulk_clks_enabled = true;
+
+ return 0;
+}
+
+static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 rx_clk_phase;
+ int ret;
+
+ meson_mx_sdhc_disable_clks(mmc);
+
+ if (ios->clock) {
+ ret = clk_set_rate(host->sd_clk, ios->clock);
+ if (ret) {
+ dev_warn(mmc_dev(mmc),
+ "Failed to set MMC clock to %uHz: %d\n",
+ ios->clock, host->error);
+ return ret;
+ }
+
+ ret = meson_mx_sdhc_enable_clks(mmc);
+ if (ret)
+ return ret;
+
+ mmc->actual_clock = clk_get_rate(host->sd_clk);
+
+ /*
+ * according to Amlogic the following latching points are
+ * selected with empirical values, there is no (known) formula
+ * to calculate these.
+ */
+ if (mmc->actual_clock > 100000000) {
+ rx_clk_phase = 1;
+ } else if (mmc->actual_clock > 45000000) {
+ if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
+ rx_clk_phase = 15;
+ else
+ rx_clk_phase = 11;
+ } else if (mmc->actual_clock >= 25000000) {
+ rx_clk_phase = 15;
+ } else if (mmc->actual_clock > 5000000) {
+ rx_clk_phase = 23;
+ } else if (mmc->actual_clock > 1000000) {
+ rx_clk_phase = 55;
+ } else {
+ rx_clk_phase = 1061;
+ }
+
+ regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+ MESON_SDHC_CLK2_RX_CLK_PHASE,
+ FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+ rx_clk_phase));
+ } else {
+ mmc->actual_clock = 0;
+ }
+
+ return 0;
+}
+
+static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ unsigned short vdd = ios->vdd;
+
+ switch (ios->power_mode) {
+ case MMC_POWER_OFF:
+ vdd = 0;
+ /* fall through */
+
+ case MMC_POWER_UP:
+ if (!IS_ERR(mmc->supply.vmmc)) {
+ host->error = mmc_regulator_set_ocr(mmc,
+ mmc->supply.vmmc,
+ vdd);
+ if (host->error)
+ return;
+ }
+
+ break;
+
+ case MMC_POWER_ON:
+ break;
+ }
+
+ host->error = meson_mx_sdhc_set_clk(mmc, ios);
+ if (host->error)
+ return;
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_DAT_TYPE,
+ FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0));
+ break;
+
+ case MMC_BUS_WIDTH_4:
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_DAT_TYPE,
+ FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1));
+ break;
+
+ case MMC_BUS_WIDTH_8:
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_DAT_TYPE,
+ FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2));
+ break;
+
+ default:
+ dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
+ ios->bus_width);
+ host->error = -EINVAL;
+ return;
+ }
+}
+
+static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmc_data *data = mrq->data;
+ int dma_len;
+
+ if (!data)
+ return 0;
+
+ dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
+ mmc_get_dma_dir(data));
+ if (dma_len <= 0) {
+ dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ struct mmc_command *cmd = mrq->cmd;
+
+ if (!host->error)
+ host->error = meson_mx_sdhc_map_dma(mmc, mrq);
+
+ if (host->error) {
+ cmd->error = host->error;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ host->mrq = mrq;
+
+ meson_mx_sdhc_start_cmd(mmc, mrq->cmd);
+}
+
+static int meson_mx_sdhc_card_busy(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 stat;
+
+ regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+ return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0;
+}
+
+static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc,
+ u32 opcode)
+{
+ unsigned int i, num_matches = 0;
+ int ret;
+
+ for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) {
+ ret = mmc_send_tuning(mmc, opcode, NULL);
+ if (!ret)
+ num_matches++;
+ }
+
+ return num_matches == MESON_SDHC_NUM_TUNING_TRIES;
+}
+
+static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ int div, start, len, best_start, best_len;
+ int curr_phase, old_phase, new_phase;
+ u32 val;
+
+ len = 0;
+ start = 0;
+ best_len = 0;
+
+ regmap_read(host->regmap, MESON_SDHC_CLK2, &val);
+ old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val);
+
+ regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
+ div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val);
+
+ for (curr_phase = 0; curr_phase <= div; curr_phase++) {
+ regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+ MESON_SDHC_CLK2_RX_CLK_PHASE,
+ FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+ curr_phase));
+
+ if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) {
+ if (!len) {
+ start = curr_phase;
+
+ dev_dbg(mmc_dev(mmc),
+ "New RX phase window starts at %u\n",
+ start);
+ }
+
+ len++;
+ } else {
+ if (len > best_len) {
+ best_start = start;
+ best_len = len;
+
+ dev_dbg(mmc_dev(mmc),
+ "New best RX phase window: %u - %u\n",
+ best_start, best_start + best_len);
+ }
+
+ /* reset the current window */
+ len = 0;
+ }
+ }
+
+ if (len > best_len)
+ /* the last window is the best (or possibly only) window */
+ new_phase = start + (len / 2);
+ else if (best_len)
+ /* there was a better window than the last */
+ new_phase = best_start + (best_len / 2);
+ else
+ /* no window was found at all, reset to the original phase */
+ new_phase = old_phase;
+
+ regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+ MESON_SDHC_CLK2_RX_CLK_PHASE,
+ FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+ new_phase));
+
+ if (!len && !best_len)
+ return -EIO;
+
+ dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase);
+
+ return 0;
+}
+
+static const struct mmc_host_ops meson_mx_sdhc_ops = {
+ .hw_reset = meson_mx_sdhc_hw_reset,
+ .request = meson_mx_sdhc_request,
+ .set_ios = meson_mx_sdhc_set_ios,
+ .card_busy = meson_mx_sdhc_card_busy,
+ .execute_tuning = meson_mx_sdhc_execute_tuning,
+ .get_cd = mmc_gpio_get_cd,
+ .get_ro = mmc_gpio_get_ro,
+};
+
+static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host)
+{
+ struct mmc_request *mrq = host->mrq;
+ struct mmc_host *mmc = host->mmc;
+
+ /* disable interrupts and mask all pending ones */
+ regmap_update_bits(host->regmap, MESON_SDHC_ICTL,
+ MESON_SDHC_ICTL_ALL_IRQS, 0);
+ regmap_update_bits(host->regmap, MESON_SDHC_ISTA,
+ MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS);
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+
+ mmc_request_done(mmc, mrq);
+}
+
+static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx)
+{
+ u32 val;
+
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE, 0);
+
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_PIO_RDRESP,
+ FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx));
+
+ regmap_read(host->regmap, MESON_SDHC_ARGU, &val);
+
+ return val;
+}
+
+static irqreturn_t meson_mx_sdhc_irq(int irq, void *data)
+{
+ struct meson_mx_sdhc_host *host = data;
+ struct mmc_command *cmd = host->cmd;
+ u32 ictl, ista;
+
+ regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl);
+ regmap_read(host->regmap, MESON_SDHC_ISTA, &ista);
+
+ if (!(ictl & ista))
+ return IRQ_NONE;
+
+ if (ista & MESON_SDHC_ISTA_RXFIFO_FULL ||
+ ista & MESON_SDHC_ISTA_TXFIFO_EMPTY)
+ cmd->error = -EIO;
+ else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC)
+ cmd->error = -EILSEQ;
+ else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT)
+ cmd->error = -ETIMEDOUT;
+
+ if (cmd->data) {
+ if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC)
+ cmd->data->error = -EILSEQ;
+ else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT)
+ cmd->data->error = -ETIMEDOUT;
+ }
+
+ if (cmd->error || (cmd->data && cmd->data->error))
+ dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n",
+ cmd->opcode, ista);
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data)
+{
+ struct meson_mx_sdhc_host *host = irq_data;
+ struct mmc_command *cmd;
+ u32 val;
+
+ cmd = host->cmd;
+ if (WARN_ON(!cmd))
+ return IRQ_HANDLED;
+
+ if (cmd->data && !cmd->data->error) {
+ if (!host->platform->hardware_flush_all_cmds &&
+ cmd->data->flags & MMC_DATA_READ) {
+ meson_mx_sdhc_wait_cmd_ready(host->mmc);
+
+ val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ 2);
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ val);
+ }
+
+ dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
+ cmd->data->sg_len, mmc_get_dma_dir(cmd->data));
+
+ cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
+ }
+
+ meson_mx_sdhc_wait_cmd_ready(host->mmc);
+
+ if (cmd->flags & MMC_RSP_136) {
+ cmd->resp[0] = meson_mx_sdhc_read_response(host, 4);
+ cmd->resp[1] = meson_mx_sdhc_read_response(host, 3);
+ cmd->resp[2] = meson_mx_sdhc_read_response(host, 2);
+ cmd->resp[3] = meson_mx_sdhc_read_response(host, 1);
+ } else {
+ cmd->resp[0] = meson_mx_sdhc_read_response(host, 0);
+ }
+
+ if (cmd->error == -EIO || cmd->error == -ETIMEDOUT)
+ meson_mx_sdhc_hw_reset(host->mmc);
+ else if (cmd->data)
+ /*
+ * Clear the FIFOs after completing data transfers to prevent
+ * corrupting data on write access. It's not clear why this is
+ * needed (for reads and writes), but it mimics what the BSP
+ * kernel did.
+ */
+ meson_mx_sdhc_clear_fifo(host->mmc);
+
+ meson_mx_sdhc_request_done(host);
+
+ return IRQ_HANDLED;
+}
+
+static int meson_mx_sdhc_register_clkc(struct meson_mx_sdhc_host *host)
+{
+ struct device *dev = mmc_dev(host->mmc);
+ int ret;
+
+ host->clkc_pdev = platform_device_alloc(host->platform->clkc_name,
+ PLATFORM_DEVID_NONE);
+ if (!host->clkc_pdev) {
+ dev_err(dev, "Failed to allocate %s clock controller device\n",
+ host->platform->clkc_name);
+ return -ENOMEM;
+ }
+
+ host->clkc_pdev->dev.parent = dev;
+
+ ret = platform_device_add(host->clkc_pdev);
+ if (ret) {
+ dev_err(dev, "Failed to register %s clock controller device\n",
+ host->platform->clkc_name);
+ platform_device_put(host->clkc_pdev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_MISC,
+ FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
+
+ regmap_write(host->regmap, MESON_SDHC_ENHC,
+ FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) |
+ MESON_SDHC_ENHC_MESON6_DMA_WR_RESP |
+ FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) |
+ FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
+};
+
+static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ if (host->cmd->data->flags & MMC_DATA_WRITE)
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE |
+ MESON_SDHC_PDMA_RD_BURST |
+ MESON_SDHC_PDMA_TXFIFO_FILL,
+ MESON_SDHC_PDMA_DMA_MODE |
+ FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) |
+ MESON_SDHC_PDMA_TXFIFO_FILL);
+ else
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE |
+ MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ MESON_SDHC_PDMA_DMA_MODE |
+ FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ 1));
+
+ if (host->cmd->data->flags & MMC_DATA_WRITE)
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_RD_BURST,
+ FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15));
+}
+
+static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 val;
+ int ret;
+
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val,
+ val == 0, 1, 200);
+ if (ret)
+ dev_warn(mmc_dev(mmc),
+ "Failed to wait for ESTA to clear: 0x%08x\n", val);
+
+ if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) {
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT,
+ val,
+ val & MESON_SDHC_STAT_TXFIFO_CNT,
+ 1, 200);
+ if (ret)
+ dev_warn(mmc_dev(mmc),
+ "Failed to wait for TX FIFO to fill\n");
+ }
+}
+
+static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_MISC,
+ FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
+
+ regmap_write(host->regmap, MESON_SDHC_ENHC,
+ FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) |
+ FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) |
+ MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE |
+ FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
+}
+
+static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE);
+}
+
+static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ meson_mx_sdhc_hw_reset(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_CTRL,
+ FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) |
+ FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) |
+ FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) |
+ FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7));
+
+ /*
+ * start with a valid divider and enable the memory (un-setting
+ * MESON_SDHC_CLKC_MEM_PWR_OFF).
+ */
+ regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV);
+
+ regmap_write(host->regmap, MESON_SDHC_CLK2,
+ FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1));
+
+ regmap_write(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_URGENT |
+ FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) |
+ FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) |
+ FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) |
+ FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7));
+
+ /* some initialization bits depend on the SoC: */
+ host->platform->init_hw(mmc);
+
+ /* disable and mask all interrupts: */
+ regmap_write(host->regmap, MESON_SDHC_ICTL, 0);
+ regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
+}
+
+static int meson_mx_sdhc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct meson_mx_sdhc_host *host;
+ struct mmc_host *mmc;
+ void __iomem *base;
+ int ret, irq;
+
+ mmc = mmc_alloc_host(sizeof(*host), dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
+ mmc);
+ if (ret) {
+ dev_err(dev, "Failed to register mmc_free_host action\n");
+ return ret;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+
+ platform_set_drvdata(pdev, host);
+
+ host->platform = device_get_match_data(dev);
+ if (!host->platform)
+ return -EINVAL;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ host->regmap = devm_regmap_init_mmio(dev, base,
+ &meson_mx_sdhc_regmap_config);
+ if (IS_ERR(host->regmap))
+ return PTR_ERR(host->regmap);
+
+ host->pclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(host->pclk))
+ return PTR_ERR(host->pclk);
+
+ /* accessing any register requires the module clock to be enabled: */
+ ret = clk_prepare_enable(host->pclk);
+ if (ret) {
+ dev_err(dev, "Failed to enable 'pclk' clock\n");
+ return ret;
+ }
+
+ meson_mx_sdhc_init_hw(mmc);
+
+ ret = meson_mx_sdhc_register_clkc(host);
+ if (ret)
+ goto err_disable_pclk;
+
+ host->bulk_clks[0].id = "mod_clk";
+ host->bulk_clks[1].id = "sd_clk";
+ host->bulk_clks[2].id = "tx_clk";
+ host->bulk_clks[3].id = "rx_clk";
+ ret = devm_clk_bulk_get(dev, MESON_SDHC_NUM_BULK_CLKS,
+ host->bulk_clks);
+ if (ret)
+ goto err_clkc_pdev_unregister;
+
+ host->sd_clk = host->bulk_clks[1].clk;
+
+ /* Get regulators and the supported OCR mask */
+ ret = mmc_regulator_get_supply(mmc);
+ if (ret)
+ goto err_clkc_pdev_unregister;
+
+ mmc->max_req_size = SZ_128K;
+ mmc->max_seg_size = mmc->max_req_size;
+ mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0);
+ mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE;
+ mmc->max_busy_timeout = 30 * MSEC_PER_SEC;
+ mmc->f_min = clk_round_rate(host->sd_clk, 1);
+ mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX);
+ mmc->max_current_180 = 300;
+ mmc->max_current_330 = 300;
+ mmc->caps |= MMC_CAP_ERASE | MMC_CAP_HW_RESET;
+ mmc->ops = &meson_mx_sdhc_ops;
+
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ goto err_clkc_pdev_unregister;
+
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq,
+ meson_mx_sdhc_irq_thread, IRQF_ONESHOT,
+ NULL, host);
+ if (ret)
+ goto err_clkc_pdev_unregister;
+
+ ret = mmc_add_host(mmc);
+ if (ret)
+ goto err_clkc_pdev_unregister;
+
+ return 0;
+
+err_clkc_pdev_unregister:
+ platform_device_unregister(host->clkc_pdev);
+err_disable_pclk:
+ clk_disable_unprepare(host->pclk);
+ return ret;
+}
+
+static int meson_mx_sdhc_remove(struct platform_device *pdev)
+{
+ struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev);
+
+ mmc_remove_host(host->mmc);
+
+ meson_mx_sdhc_disable_clks(host->mmc);
+
+ platform_device_unregister(host->clkc_pdev);
+
+ clk_disable_unprepare(host->pclk);
+
+ return 0;
+}
+
+static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = {
+ .init_hw = meson_mx_sdhc_init_hw_meson8,
+ .set_pdma = meson_mx_sdhc_set_pdma_meson8,
+ .wait_before_send = meson_mx_sdhc_wait_before_send_meson8,
+ .hardware_flush_all_cmds = false,
+ .clkc_name = "meson8-sdhc-clkc",
+};
+
+static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = {
+ .init_hw = meson_mx_sdhc_init_hw_meson8m2,
+ .set_pdma = meson_mx_sdhc_set_pdma_meson8m2,
+ .hardware_flush_all_cmds = true,
+ .clkc_name = "meson8m2-sdhc-clkc",
+};
+
+static const struct of_device_id meson_mx_sdhc_of_match[] = {
+ {
+ .compatible = "amlogic,meson8-sdhc",
+ .data = &meson_mx_sdhc_data_meson8
+ },
+ {
+ .compatible = "amlogic,meson8b-sdhc",
+ .data = &meson_mx_sdhc_data_meson8
+ },
+ {
+ .compatible = "amlogic,meson8m2-sdhc",
+ .data = &meson_mx_sdhc_data_meson8m2
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match);
+
+static struct platform_driver meson_mx_sdhc_driver = {
+ .probe = meson_mx_sdhc_probe,
+ .remove = meson_mx_sdhc_remove,
+ .driver = {
+ .name = "meson-mx-sdhc",
+ .of_match_table = of_match_ptr(meson_mx_sdhc_of_match),
+ },
+};
+
+module_platform_driver(meson_mx_sdhc_driver);
+
+MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver");
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_LICENSE("GPL v2");
--
2.24.1
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