[PATCH v3 3/3] i2c:aspeed:support ast2600 i2c new register mode driver
ryan_chen
ryan_chen at aspeedtech.com
Sun May 15 23:49:00 PDT 2022
Add i2c new register mode driver to support AST2600 i2c
new register set. AST2600 i2c controller have legacy and
new register mode. The new register mode have global register
support 4 base clock for scl clock selection, and new clock
divider mode. And i2c new register mode have separate register
set to control i2c master and slave.
Signed-off-by: ryan_chen <ryan_chen at aspeedtech.com>
---
drivers/i2c/busses/Kconfig | 11 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-ast2600-global.c | 94 ++
drivers/i2c/busses/i2c-ast2600-global.h | 19 +
drivers/i2c/busses/i2c-ast2600.c | 1703 +++++++++++++++++++++++
5 files changed, 1828 insertions(+)
create mode 100644 drivers/i2c/busses/i2c-ast2600-global.c
create mode 100644 drivers/i2c/busses/i2c-ast2600-global.h
create mode 100644 drivers/i2c/busses/i2c-ast2600.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index a1bae59208e3..c667200d7923 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -387,6 +387,17 @@ config I2C_ALTERA
This driver can also be built as a module. If so, the module
will be called i2c-altera.
+config I2C_AST2600
+ tristate "Aspeed AST2600 I2C Controller"
+ depends on ARCH_ASPEED || MACH_ASPEED_G6 || COMPILE_TEST
+ select I2C_SMBUS
+ help
+ If you say yes to this option, support will be included for the
+ Aspeed I2C controller with new register set.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-new-aspeed.
+
config I2C_ASPEED
tristate "Aspeed I2C Controller"
depends on ARCH_ASPEED || COMPILE_TEST
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 479f60e4ee3d..00276d533288 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_I2C_POWERMAC) += i2c-powermac.o
obj-$(CONFIG_I2C_ALTERA) += i2c-altera.o
obj-$(CONFIG_I2C_AMD_MP2) += i2c-amd-mp2-pci.o i2c-amd-mp2-plat.o
obj-$(CONFIG_I2C_ASPEED) += i2c-aspeed.o
+obj-$(CONFIG_I2C_AST2600) += i2c-ast2600-global.o i2c-ast2600.o
obj-$(CONFIG_I2C_AT91) += i2c-at91.o
i2c-at91-objs := i2c-at91-core.o i2c-at91-master.o
ifeq ($(CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL),y)
diff --git a/drivers/i2c/busses/i2c-ast2600-global.c b/drivers/i2c/busses/i2c-ast2600-global.c
new file mode 100644
index 000000000000..115971aacafc
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ast2600-global.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Aspeed I2C Global Controller Driver.
+ *
+ * Copyright (C) ASPEED Technology Inc.
+ */
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/module.h>
+#include <linux/reset.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include "i2c-ast2600-global.h"
+
+struct ast2600_i2c_global {
+ void __iomem *base;
+ struct reset_control *rst;
+};
+
+static const struct of_device_id ast2600_i2c_global_of_match[] = {
+ { .compatible = "aspeed,ast2600-i2c-global", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ast2600_i2c_global_of_match);
+
+#define AST2600_GLOBAL_INIT \
+ (AST2600_I2CG_SLAVE_PKT_NAK | \
+ AST2600_I2CG_CTRL_NEW_REG | \
+ AST2600_I2CG_CTRL_NEW_CLK_DIV)
+#define I2CCG_DIV_CTRL 0xC6411208
+/*
+ * APB clk : 100Mhz
+ * div : scl : baseclk [APB/((div/2) + 1)] : tBuf [1/bclk * 16]
+ * I2CG10[31:24] base clk4 for i2c auto recovery timeout counter (0xC6)
+ * I2CG10[23:16] base clk3 for Standard-mode (100Khz) min tBuf 4.7us
+ * 0x3c : 100.8Khz : 3.225Mhz : 4.96us
+ * 0x3d : 99.2Khz : 3.174Mhz : 5.04us
+ * 0x3e : 97.65Khz : 3.125Mhz : 5.12us
+ * 0x40 : 97.75Khz : 3.03Mhz : 5.28us
+ * 0x41 : 99.5Khz : 2.98Mhz : 5.36us (default)
+ * I2CG10[15:8] base clk2 for Fast-mode (400Khz) min tBuf 1.3us
+ * 0x12 : 400Khz : 10Mhz : 1.6us
+ * I2CG10[7:0] base clk1 for Fast-mode Plus (1Mhz) min tBuf 0.5us
+ * 0x08 : 1Mhz : 20Mhz : 0.8us
+ */
+
+static int ast2600_i2c_global_probe(struct platform_device *pdev)
+{
+ struct ast2600_i2c_global *i2c_global;
+ struct resource *res;
+
+ i2c_global = devm_kzalloc(&pdev->dev, sizeof(*i2c_global), GFP_KERNEL);
+ if (IS_ERR(i2c_global))
+ return PTR_ERR(i2c_global);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2c_global->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c_global->base))
+ return PTR_ERR(i2c_global->base);
+
+ i2c_global->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(i2c_global->rst))
+ return IS_ERR(i2c_global->rst);
+
+ reset_control_assert(i2c_global->rst);
+ udelay(3);
+ reset_control_deassert(i2c_global->rst);
+
+ writel(AST2600_GLOBAL_INIT, i2c_global->base + AST2600_I2CG_CTRL);
+ writel(I2CCG_DIV_CTRL, i2c_global->base + AST2600_I2CG_CLK_DIV_CTRL);
+
+ pr_info("i2c global registered\n");
+
+ return 0;
+}
+
+static struct platform_driver ast2600_i2c_global_driver = {
+ .probe = ast2600_i2c_global_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = ast2600_i2c_global_of_match,
+ },
+};
+
+static int __init ast2600_i2c_global_init(void)
+{
+ return platform_driver_register(&ast2600_i2c_global_driver);
+}
+postcore_initcall(ast2600_i2c_global_init);
+
+MODULE_AUTHOR("Ryan Chen");
+MODULE_DESCRIPTION("AST2600 I2C Global Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-ast2600-global.h b/drivers/i2c/busses/i2c-ast2600-global.h
new file mode 100644
index 000000000000..c2c55971f32a
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ast2600-global.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef I2C_AST2600_GLOBAL_H
+#define I2C_AST2600_GLOBAL_H
+
+#include <linux/bits.h>
+
+#define AST2600_I2CG_ISR 0x00
+#define AST2600_I2CG_SLAVE_ISR 0x04
+#define AST2600_I2CG_OWNER 0x08
+#define AST2600_I2CG_CTRL 0x0C
+#define AST2600_I2CG_CLK_DIV_CTRL 0x10
+
+#define AST2600_I2CG_SLAVE_PKT_NAK BIT(4)
+#define AST2600_I2CG_M_S_SEPARATE_INTR BIT(3)
+#define AST2600_I2CG_CTRL_NEW_REG BIT(2)
+#define AST2600_I2CG_CTRL_NEW_CLK_DIV BIT(1)
+
+#endif /* I2C_AST2600_GLOBAL_H */
diff --git a/drivers/i2c/busses/i2c-ast2600.c b/drivers/i2c/busses/i2c-ast2600.c
new file mode 100644
index 000000000000..820430790609
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ast2600.c
@@ -0,0 +1,1703 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ASPEED AST2600 new register set I2C controller driver
+ *
+ * Copyright (C) ASPEED Technology Inc.
+ */
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/i2c-smbus.h>
+#include "i2c-ast2600-global.h"
+
+/* 0x00 : I2CC Master/Slave Function Control Register */
+#define AST2600_I2CC_FUN_CTRL 0x00
+#define AST2600_I2CC_SLAVE_ADDR_RX_EN BIT(20)
+#define AST2600_I2CC_MASTER_RETRY_MASK GENMASK(19, 18)
+#define AST2600_I2CC_MASTER_RETRY(x) (((x) & GENMASK(1, 0)) << 18)
+#define AST2600_I2CC_BUS_AUTO_RELEASE BIT(17)
+#define AST2600_I2CC_M_SDA_LOCK_EN BIT(16)
+#define AST2600_I2CC_MULTI_MASTER_DIS BIT(15)
+#define AST2600_I2CC_M_SCL_DRIVE_EN BIT(14)
+#define AST2600_I2CC_MSB_STS BIT(9)
+#define AST2600_I2CC_SDA_DRIVE_1T_EN BIT(8)
+#define AST2600_I2CC_M_SDA_DRIVE_1T_EN BIT(7)
+#define AST2600_I2CC_M_HIGH_SPEED_EN BIT(6)
+/* reserver 5 : 2 */
+#define AST2600_I2CC_SLAVE_EN BIT(1)
+#define AST2600_I2CC_MASTER_EN BIT(0)
+
+/* 0x04 : I2CC Master/Slave Clock and AC Timing Control Register #1 */
+#define AST2600_I2CC_AC_TIMING 0x04
+#define AST2600_I2CC_TTIMEOUT(x) (((x) & GENMASK(4, 0)) << 24)
+#define AST2600_I2CC_TCKHIGHMIN(x) (((x) & GENMASK(3, 0)) << 20)
+#define AST2600_I2CC_TCKHIGH(x) (((x) & GENMASK(3, 0)) << 16)
+#define AST2600_I2CC_TCKLOW(x) (((x) & GENMASK(3, 0)) << 12)
+#define AST2600_I2CC_THDDAT(x) (((x) & GENMASK(1, 0)) << 10)
+#define AST2600_I2CC_TOUTBASECLK(x) (((x) & GENMASK(1, 0)) << 8)
+#define AST2600_I2CC_TBASECLK(x) ((x) & GENMASK(3, 0))
+
+/* 0x08 : I2CC Master/Slave Transmit/Receive Byte Buffer Register */
+#define AST2600_I2CC_STS_AND_BUFF 0x08
+#define AST2600_I2CC_TX_DIR_MASK GENMASK(31, 29)
+#define AST2600_I2CC_SDA_OE BIT(28)
+#define AST2600_I2CC_SDA_O BIT(27)
+#define AST2600_I2CC_SCL_OE BIT(26)
+#define AST2600_I2CC_SCL_O BIT(25)
+
+#define AST2600_I2CC_SCL_LINE_STS BIT(18)
+#define AST2600_I2CC_SDA_LINE_STS BIT(17)
+#define AST2600_I2CC_BUS_BUSY_STS BIT(16)
+
+#define AST2600_I2CC_GET_RX_BUFF(x) (((x) >> 8) & GENMASK(7, 0))
+
+/* 0x0C : I2CC Master/Slave Pool Buffer Control Register */
+#define AST2600_I2CC_BUFF_CTRL 0x0C
+#define AST2600_I2CC_GET_RX_BUF_LEN(x) (((x) >> 24) & GENMASK(5, 0))
+#define AST2600_I2CC_SET_RX_BUF_LEN(x) ((((x) - 1) & GENMASK(4, 0)) << 16)
+#define AST2600_I2CC_SET_TX_BUF_LEN(x) ((((x) - 1) & GENMASK(4, 0)) << 8)
+#define AST2600_I2CC_GET_TX_BUF_LEN(x) ((((x) >> 8) & GENMASK(4, 0)) + 1)
+
+/* 0x10 : I2CM Master Interrupt Control Register */
+#define AST2600_I2CM_IER 0x10
+/* 0x14 : I2CM Master Interrupt Status Register : WC */
+#define AST2600_I2CM_ISR 0x14
+
+#define AST2600_I2CM_PKT_TIMEOUT BIT(18)
+#define AST2600_I2CM_PKT_ERROR BIT(17)
+#define AST2600_I2CM_PKT_DONE BIT(16)
+
+#define AST2600_I2CM_BUS_RECOVER_FAIL BIT(15)
+#define AST2600_I2CM_SDA_DL_TO BIT(14)
+#define AST2600_I2CM_BUS_RECOVER BIT(13)
+#define AST2600_I2CM_SMBUS_ALT BIT(12)
+
+#define AST2600_I2CM_SCL_LOW_TO BIT(6)
+#define AST2600_I2CM_ABNORMAL BIT(5)
+#define AST2600_I2CM_NORMAL_STOP BIT(4)
+#define AST2600_I2CM_ARBIT_LOSS BIT(3)
+#define AST2600_I2CM_RX_DONE BIT(2)
+#define AST2600_I2CM_TX_NAK BIT(1)
+#define AST2600_I2CM_TX_ACK BIT(0)
+
+/* 0x18 : I2CM Master Command/Status Register */
+#define AST2600_I2CM_CMD_STS 0x18
+#define AST2600_I2CM_PKT_ADDR(x) (((x) & GENMASK(6, 0)) << 24)
+#define AST2600_I2CM_PKT_EN BIT(16)
+#define AST2600_I2CM_SDA_OE_OUT_DIR BIT(15)
+#define AST2600_I2CM_SDA_O_OUT_DIR BIT(14)
+#define AST2600_I2CM_SCL_OE_OUT_DIR BIT(13)
+#define AST2600_I2CM_SCL_O_OUT_DIR BIT(12)
+#define AST2600_I2CM_RECOVER_CMD_EN BIT(11)
+
+#define AST2600_I2CM_RX_DMA_EN BIT(9)
+#define AST2600_I2CM_TX_DMA_EN BIT(8)
+/* Command Bit */
+#define AST2600_I2CM_RX_BUFF_EN BIT(7)
+#define AST2600_I2CM_TX_BUFF_EN BIT(6)
+#define AST2600_I2CM_STOP_CMD BIT(5)
+#define AST2600_I2CM_RX_CMD_LAST BIT(4)
+#define AST2600_I2CM_RX_CMD BIT(3)
+
+#define AST2600_I2CM_TX_CMD BIT(1)
+#define AST2600_I2CM_START_CMD BIT(0)
+
+/* 0x1C : I2CM Master DMA Transfer Length Register */
+#define AST2600_I2CM_DMA_LEN 0x1C
+/* Tx Rx support length 1 ~ 4096 */
+#define AST2600_I2CM_SET_RX_DMA_LEN(x) ((((x) & GENMASK(11, 0)) << 16) | BIT(31))
+#define AST2600_I2CM_SET_TX_DMA_LEN(x) (((x) & GENMASK(11, 0)) | BIT(15))
+
+/* 0x20 : I2CS Slave Interrupt Control Register */
+#define AST2600_I2CS_IER 0x20
+/* 0x24 : I2CS Slave Interrupt Status Register */
+#define AST2600_I2CS_ISR 0x24
+
+#define AST2600_I2CS_ADDR_INDICATE_MASK GENMASK(31, 30)
+#define AST2600_I2CS_SLAVE_PENDING BIT(29)
+
+#define AST2600_I2CS_WAIT_TX_DMA BIT(25)
+#define AST2600_I2CS_WAIT_RX_DMA BIT(24)
+
+#define AST2600_I2CS_ADDR3_NAK BIT(22)
+#define AST2600_I2CS_ADDR2_NAK BIT(21)
+#define AST2600_I2CS_ADDR1_NAK BIT(20)
+
+#define AST2600_I2CS_ADDR_MASK GENMASK(19, 18)
+#define AST2600_I2CS_PKT_ERROR BIT(17)
+#define AST2600_I2CS_PKT_DONE BIT(16)
+#define AST2600_I2CS_INACTIVE_TO BIT(15)
+
+#define AST2600_I2CS_SLAVE_MATCH BIT(7)
+#define AST2600_I2CS_ABNOR_STOP BIT(5)
+#define AST2600_I2CS_STOP BIT(4)
+#define AST2600_I2CS_RX_DONE_NAK BIT(3)
+#define AST2600_I2CS_RX_DONE BIT(2)
+#define AST2600_I2CS_TX_NAK BIT(1)
+#define AST2600_I2CS_TX_ACK BIT(0)
+
+/* 0x28 : I2CS Slave CMD/Status Register */
+#define AST2600_I2CS_CMD_STS 0x28
+#define AST2600_I2CS_ACTIVE_ALL GENMASK(18, 17)
+#define AST2600_I2CS_PKT_MODE_EN BIT(16)
+#define AST2600_I2CS_AUTO_NAK_NOADDR BIT(15)
+#define AST2600_I2CS_AUTO_NAK_EN BIT(14)
+
+#define AST2600_I2CS_ALT_EN BIT(10)
+#define AST2600_I2CS_RX_DMA_EN BIT(9)
+#define AST2600_I2CS_TX_DMA_EN BIT(8)
+#define AST2600_I2CS_RX_BUFF_EN BIT(7)
+#define AST2600_I2CS_TX_BUFF_EN BIT(6)
+#define AST2600_I2CS_RX_CMD_LAST BIT(4)
+
+#define AST2600_I2CS_TX_CMD BIT(2)
+
+#define AST2600_I2CS_DMA_LEN 0x2C
+#define AST2600_I2CS_SET_RX_DMA_LEN(x) (((((x) - 1) & GENMASK(11, 0)) << 16) | BIT(31))
+#define AST2600_I2CS_RX_DMA_LEN_MASK (GENMASK(11, 0) << 16)
+
+#define AST2600_I2CS_SET_TX_DMA_LEN(x) ((((x) - 1) & GENMASK(11, 0)) | BIT(15))
+#define AST2600_I2CS_TX_DMA_LEN_MASK GENMASK(11, 0)
+
+/* I2CM Master DMA Tx Buffer Register */
+#define AST2600_I2CM_TX_DMA 0x30
+/* I2CM Master DMA Rx Buffer Register */
+#define AST2600_I2CM_RX_DMA 0x34
+/* I2CS Slave DMA Tx Buffer Register */
+#define AST2600_I2CS_TX_DMA 0x38
+/* I2CS Slave DMA Rx Buffer Register */
+#define AST2600_I2CS_RX_DMA 0x3C
+
+#define AST2600_I2CS_ADDR_CTRL 0x40
+
+#define AST2600_I2CS_ADDR3_MASK GENMASK(22, 16)
+#define AST2600_I2CS_ADDR2_MASK GENMASK(14, 8)
+#define AST2600_I2CS_ADDR1_MASK GENMASK(6, 0)
+
+#define AST2600_I2CM_DMA_LEN_STS 0x48
+#define AST2600_I2CS_DMA_LEN_STS 0x4C
+
+#define AST2600_I2C_GET_TX_DMA_LEN(x) ((x) & GENMASK(12, 0))
+#define AST2600_I2C_GET_RX_DMA_LEN(x) (((x) >> 16) & GENMASK(12, 0))
+
+/* 0x40 : Slave Device Address Register */
+#define AST2600_I2CS_ADDR3_ENABLE BIT(23)
+#define AST2600_I2CS_ADDR3(x) ((x) << 16)
+
+#define AST2600_I2CS_ADDR2_ENABLE BIT(15)
+#define AST2600_I2CS_ADDR2(x) ((x) << 8)
+#define AST2600_I2CS_ADDR1_ENABLE BIT(7)
+#define AST2600_I2CS_ADDR1(x) (x)
+
+#define I2C_SLAVE_MSG_BUF_SIZE 256
+
+#define AST2600_I2C_DMA_SIZE 4096
+
+#define MASTER_TRIGGER_LAST_STOP (AST2600_I2CM_RX_CMD_LAST | AST2600_I2CM_STOP_CMD)
+#define SLAVE_TRIGGER_CMD (AST2600_I2CS_ACTIVE_ALL | AST2600_I2CS_PKT_MODE_EN)
+
+/* i2c timeout counter: use base clk4 1Mhz
+ * 1/(1000/4096) = 4.096ms * 8 = 32.768ms
+ */
+#define AST_I2C_TIMEOUT_CLK 0x2
+#define AST_I2C_TIMEOUT_COUNT 0x8
+
+struct ast2600_i2c_timing_table {
+ u32 divisor;
+ u32 timing;
+};
+
+static struct ast2600_i2c_timing_table i2c_legacy_timing_table[] = {
+ /* Divisor : Base Clock : tCKHighMin : tCK High : tCK Low */
+ /* Divisor : [3:0] : [23: 20] : [19:16]: [15:12] */
+ { 6, 0x00000300 | (0x0) | (0x2 << 20) | (0x2 << 16) | (0x2 << 12) },
+ { 7, 0x00000300 | (0x0) | (0x3 << 20) | (0x3 << 16) | (0x2 << 12) },
+ { 8, 0x00000300 | (0x0) | (0x3 << 20) | (0x3 << 16) | (0x3 << 12) },
+ { 9, 0x00000300 | (0x0) | (0x4 << 20) | (0x4 << 16) | (0x3 << 12) },
+ { 10, 0x00000300 | (0x0) | (0x4 << 20) | (0x4 << 16) | (0x4 << 12) },
+ { 11, 0x00000300 | (0x0) | (0x5 << 20) | (0x5 << 16) | (0x4 << 12) },
+ { 12, 0x00000300 | (0x0) | (0x5 << 20) | (0x5 << 16) | (0x5 << 12) },
+ { 13, 0x00000300 | (0x0) | (0x6 << 20) | (0x6 << 16) | (0x5 << 12) },
+ { 14, 0x00000300 | (0x0) | (0x6 << 20) | (0x6 << 16) | (0x6 << 12) },
+ { 15, 0x00000300 | (0x0) | (0x7 << 20) | (0x7 << 16) | (0x6 << 12) },
+ { 16, 0x00000300 | (0x0) | (0x7 << 20) | (0x7 << 16) | (0x7 << 12) },
+ { 17, 0x00000300 | (0x0) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 18, 0x00000300 | (0x0) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 19, 0x00000300 | (0x0) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 20, 0x00000300 | (0x0) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 21, 0x00000300 | (0x0) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 22, 0x00000300 | (0x0) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 23, 0x00000300 | (0x0) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 24, 0x00000300 | (0x0) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 25, 0x00000300 | (0x0) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 26, 0x00000300 | (0x0) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 27, 0x00000300 | (0x0) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 28, 0x00000300 | (0x0) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 29, 0x00000300 | (0x0) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 30, 0x00000300 | (0x0) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 31, 0x00000300 | (0x0) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 32, 0x00000300 | (0x0) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 34, 0x00000300 | (0x1) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 36, 0x00000300 | (0x1) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 38, 0x00000300 | (0x1) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 40, 0x00000300 | (0x1) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 42, 0x00000300 | (0x1) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 44, 0x00000300 | (0x1) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 46, 0x00000300 | (0x1) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 48, 0x00000300 | (0x1) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 50, 0x00000300 | (0x1) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 52, 0x00000300 | (0x1) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 54, 0x00000300 | (0x1) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 56, 0x00000300 | (0x1) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 58, 0x00000300 | (0x1) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 60, 0x00000300 | (0x1) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 62, 0x00000300 | (0x1) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 64, 0x00000300 | (0x1) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 68, 0x00000300 | (0x2) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 72, 0x00000300 | (0x2) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 76, 0x00000300 | (0x2) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 80, 0x00000300 | (0x2) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 84, 0x00000300 | (0x2) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 88, 0x00000300 | (0x2) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 92, 0x00000300 | (0x2) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 96, 0x00000300 | (0x2) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 100, 0x00000300 | (0x2) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 104, 0x00000300 | (0x2) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 108, 0x00000300 | (0x2) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 112, 0x00000300 | (0x2) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 116, 0x00000300 | (0x2) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 120, 0x00000300 | (0x2) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 124, 0x00000300 | (0x2) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 128, 0x00000300 | (0x2) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 136, 0x00000300 | (0x3) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 144, 0x00000300 | (0x3) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 152, 0x00000300 | (0x3) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 160, 0x00000300 | (0x3) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 168, 0x00000300 | (0x3) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 176, 0x00000300 | (0x3) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 184, 0x00000300 | (0x3) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 192, 0x00000300 | (0x3) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 200, 0x00000300 | (0x3) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 208, 0x00000300 | (0x3) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 216, 0x00000300 | (0x3) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 224, 0x00000300 | (0x3) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 232, 0x00000300 | (0x3) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 240, 0x00000300 | (0x3) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 248, 0x00000300 | (0x3) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 256, 0x00000300 | (0x3) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 272, 0x00000300 | (0x4) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 288, 0x00000300 | (0x4) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 304, 0x00000300 | (0x4) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 320, 0x00000300 | (0x4) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 336, 0x00000300 | (0x4) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 352, 0x00000300 | (0x4) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 368, 0x00000300 | (0x4) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 384, 0x00000300 | (0x4) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 400, 0x00000300 | (0x4) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 416, 0x00000300 | (0x4) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 432, 0x00000300 | (0x4) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 448, 0x00000300 | (0x4) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 464, 0x00000300 | (0x4) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 480, 0x00000300 | (0x4) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 496, 0x00000300 | (0x4) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 512, 0x00000300 | (0x4) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 544, 0x00000300 | (0x5) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 576, 0x00000300 | (0x5) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 608, 0x00000300 | (0x5) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 640, 0x00000300 | (0x5) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 672, 0x00000300 | (0x5) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 704, 0x00000300 | (0x5) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 736, 0x00000300 | (0x5) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 768, 0x00000300 | (0x5) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 800, 0x00000300 | (0x5) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 832, 0x00000300 | (0x5) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 864, 0x00000300 | (0x5) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 896, 0x00000300 | (0x5) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 928, 0x00000300 | (0x5) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 960, 0x00000300 | (0x5) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 992, 0x00000300 | (0x5) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 1024, 0x00000300 | (0x5) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 1088, 0x00000300 | (0x6) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 1152, 0x00000300 | (0x6) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 1216, 0x00000300 | (0x6) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 1280, 0x00000300 | (0x6) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 1344, 0x00000300 | (0x6) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 1408, 0x00000300 | (0x6) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 1472, 0x00000300 | (0x6) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 1536, 0x00000300 | (0x6) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+ { 1600, 0x00000300 | (0x6) | (0xc << 20) | (0xc << 16) | (0xb << 12) },
+ { 1664, 0x00000300 | (0x6) | (0xc << 20) | (0xc << 16) | (0xc << 12) },
+ { 1728, 0x00000300 | (0x6) | (0xd << 20) | (0xd << 16) | (0xc << 12) },
+ { 1792, 0x00000300 | (0x6) | (0xd << 20) | (0xd << 16) | (0xd << 12) },
+ { 1856, 0x00000300 | (0x6) | (0xe << 20) | (0xe << 16) | (0xd << 12) },
+ { 1920, 0x00000300 | (0x6) | (0xe << 20) | (0xe << 16) | (0xe << 12) },
+ { 1984, 0x00000300 | (0x6) | (0xf << 20) | (0xf << 16) | (0xe << 12) },
+ { 2048, 0x00000300 | (0x6) | (0xf << 20) | (0xf << 16) | (0xf << 12) },
+
+ { 2176, 0x00000300 | (0x7) | (0x8 << 20) | (0x8 << 16) | (0x7 << 12) },
+ { 2304, 0x00000300 | (0x7) | (0x8 << 20) | (0x8 << 16) | (0x8 << 12) },
+ { 2432, 0x00000300 | (0x7) | (0x9 << 20) | (0x9 << 16) | (0x8 << 12) },
+ { 2560, 0x00000300 | (0x7) | (0x9 << 20) | (0x9 << 16) | (0x9 << 12) },
+ { 2688, 0x00000300 | (0x7) | (0xa << 20) | (0xa << 16) | (0x9 << 12) },
+ { 2816, 0x00000300 | (0x7) | (0xa << 20) | (0xa << 16) | (0xa << 12) },
+ { 2944, 0x00000300 | (0x7) | (0xb << 20) | (0xb << 16) | (0xa << 12) },
+ { 3072, 0x00000300 | (0x7) | (0xb << 20) | (0xb << 16) | (0xb << 12) },
+};
+
+enum xfer_mode {
+ BYTE_MODE = 0,
+ BUFF_MODE,
+ DMA_MODE,
+};
+
+struct ast2600_i2c_bus {
+ struct i2c_adapter adap;
+ struct device *dev;
+ void __iomem *reg_base;
+ struct regmap *global_reg;
+ int irq;
+ /* 0: dma, 1: pool, 2:byte */
+ enum xfer_mode mode;
+ /* 0: old mode, 1: new mode */
+ int clk_div_mode;
+ struct clk *clk;
+ u32 apb_clk;
+ u32 bus_frequency;
+ /*I2C xfer mode state matchine */
+ u32 state;
+ int timeout_enable;
+ /* smbus alert */
+ int alert_enable;
+ struct i2c_smbus_alert_setup alert_data;
+ struct i2c_client *ara;
+ /* Multi-master */
+ bool multi_master;
+ /* master structure */
+ int cmd_err;
+ struct completion cmd_complete;
+ struct i2c_msg *msgs; /* cur xfer msgs */
+ size_t buf_index; /* buffer mode idx */
+ /* cur xfer msgs index*/
+ int msgs_index;
+ int msgs_count; /* total msgs */
+ dma_addr_t master_dma_addr;
+ /*total xfer count */
+ int master_xfer_cnt;
+ /* Buffer mode */
+ void __iomem *buf_base;
+ size_t buf_size;
+ /* Slave structure */
+ int slave_xfer_len;
+ int slave_xfer_cnt;
+#ifdef CONFIG_I2C_SLAVE
+ unsigned char *slave_dma_buf;
+ dma_addr_t slave_dma_addr;
+ struct i2c_client *slave;
+#endif
+};
+
+static u32 ast2600_select_i2c_clock(struct ast2600_i2c_bus *i2c_bus)
+{
+ unsigned long base_clk1;
+ unsigned long base_clk2;
+ unsigned long base_clk3;
+ unsigned long base_clk4;
+ int baseclk_idx;
+ u32 clk_div_reg;
+ u32 scl_low;
+ u32 scl_high;
+ int divisor;
+ int inc = 0;
+ u32 data;
+ int i;
+
+ if (i2c_bus->clk_div_mode) {
+ regmap_read(i2c_bus->global_reg, AST2600_I2CG_CLK_DIV_CTRL, &clk_div_reg);
+ base_clk1 = (i2c_bus->apb_clk * 10) / ((((clk_div_reg & 0xff) + 2) * 10) / 2);
+ base_clk2 = (i2c_bus->apb_clk * 10) /
+ (((((clk_div_reg >> 8) & 0xff) + 2) * 10) / 2);
+ base_clk3 = (i2c_bus->apb_clk * 10) /
+ (((((clk_div_reg >> 16) & 0xff) + 2) * 10) / 2);
+ base_clk4 = (i2c_bus->apb_clk * 10) /
+ (((((clk_div_reg >> 24) & 0xff) + 2) * 10) / 2);
+
+ if ((i2c_bus->apb_clk / i2c_bus->bus_frequency) <= 32) {
+ baseclk_idx = 0;
+ divisor = DIV_ROUND_UP(i2c_bus->apb_clk, i2c_bus->bus_frequency);
+ } else if ((base_clk1 / i2c_bus->bus_frequency) <= 32) {
+ baseclk_idx = 1;
+ divisor = DIV_ROUND_UP(base_clk1, i2c_bus->bus_frequency);
+ } else if ((base_clk2 / i2c_bus->bus_frequency) <= 32) {
+ baseclk_idx = 2;
+ divisor = DIV_ROUND_UP(base_clk2, i2c_bus->bus_frequency);
+ } else if ((base_clk3 / i2c_bus->bus_frequency) <= 32) {
+ baseclk_idx = 3;
+ divisor = DIV_ROUND_UP(base_clk3, i2c_bus->bus_frequency);
+ } else {
+ baseclk_idx = 4;
+ divisor = DIV_ROUND_UP(base_clk4, i2c_bus->bus_frequency);
+ inc = 0;
+ while ((divisor + inc) > 32) {
+ inc |= divisor & 0x1;
+ divisor >>= 1;
+ baseclk_idx++;
+ }
+ divisor += inc;
+ }
+ divisor = min_t(int, divisor, 32);
+ baseclk_idx &= 0xf;
+ scl_low = ((divisor * 9) / 16) - 1;
+ scl_low = min_t(u32, scl_low, 0xf);
+ scl_high = (divisor - scl_low - 2) & 0xf;
+ /* Divisor : Base Clock : tCKHighMin : tCK High : tCK Low */
+ data = ((scl_high - 1) << 20) | (scl_high << 16) | (scl_low << 12) | (baseclk_idx);
+ if (i2c_bus->timeout_enable) {
+ data |= AST2600_I2CC_TOUTBASECLK(AST_I2C_TIMEOUT_CLK);
+ data |= AST2600_I2CC_TTIMEOUT(AST_I2C_TIMEOUT_COUNT);
+ }
+ } else {
+ for (i = 0; i < ARRAY_SIZE(i2c_legacy_timing_table); i++) {
+ if ((i2c_bus->apb_clk / i2c_legacy_timing_table[i].divisor) <
+ i2c_bus->bus_frequency) {
+ break;
+ }
+ }
+ data = i2c_legacy_timing_table[i].timing;
+ }
+ return data;
+}
+
+static u8 ast2600_i2c_recover_bus(struct ast2600_i2c_bus *i2c_bus)
+{
+ int ret = 0;
+ u32 ctrl;
+ u32 state;
+ int r;
+
+ dev_dbg(i2c_bus->dev, "%d-bus recovery bus [%x]\n", i2c_bus->adap.nr,
+ readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF));
+
+ ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+
+ writel(ctrl & ~(AST2600_I2CC_MASTER_EN | AST2600_I2CC_SLAVE_EN),
+ i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+
+ writel(readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) | AST2600_I2CC_MASTER_EN,
+ i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+
+ reinit_completion(&i2c_bus->cmd_complete);
+ i2c_bus->cmd_err = 0;
+
+ //Check 0x14's SDA and SCL status
+ state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ if (!(state & AST2600_I2CC_SDA_LINE_STS) && (state & AST2600_I2CC_SCL_LINE_STS)) {
+ writel(AST2600_I2CM_RECOVER_CMD_EN, i2c_bus->reg_base + AST2600_I2CM_CMD_STS);
+ r = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout);
+ if (r == 0) {
+ dev_dbg(i2c_bus->dev, "recovery timed out\n");
+ ret = -ETIMEDOUT;
+ } else {
+ if (i2c_bus->cmd_err) {
+ dev_dbg(i2c_bus->dev, "recovery error\n");
+ ret = -EPROTO;
+ }
+ }
+ }
+
+ dev_dbg(i2c_bus->dev, "Recovery done [%x]\n",
+ readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF));
+ if (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & AST2600_I2CC_BUS_BUSY_STS) {
+ dev_dbg(i2c_bus->dev, "Can't recovery bus [%x]\n",
+ readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF));
+ }
+
+ writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+#ifdef CONFIG_I2C_SLAVE
+ if (ctrl & AST2600_I2CC_SLAVE_EN) {
+ u32 cmd = SLAVE_TRIGGER_CMD;
+
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_RX_DMA);
+ writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_TX_DMA);
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ }
+#endif
+ return ret;
+}
+
+#ifdef CONFIG_I2C_SLAVE
+static void ast2600_i2c_slave_packet_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts)
+{
+ int slave_rx_len;
+ u8 byte_data;
+ u32 cmd = 0;
+ u8 value;
+ int i = 0;
+
+ //clear irq fisrt
+ writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR);
+ readl(i2c_bus->reg_base + AST2600_I2CS_ISR);
+
+ /* Handle i2c slave timeout condition */
+ if (AST2600_I2CS_INACTIVE_TO & sts) {
+ cmd = SLAVE_TRIGGER_CMD;
+ /* Set slave mode */
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value);
+ return;
+ }
+
+ sts &= ~(AST2600_I2CS_PKT_DONE | AST2600_I2CS_PKT_ERROR);
+
+ switch (sts) {
+ case AST2600_I2CS_SLAVE_MATCH:
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE:
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+ break;
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA:
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_RX_DMA:
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+ cmd = SLAVE_TRIGGER_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_STOP:
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value);
+ cmd = SLAVE_TRIGGER_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE_NAK |
+ AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP:
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_RX_DMA |
+ AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP:
+ case AST2600_I2CS_RX_DONE_NAK | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP:
+ case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_STOP:
+ case AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP:
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP:
+ cmd = SLAVE_TRIGGER_CMD;
+ if (sts & AST2600_I2CS_SLAVE_MATCH)
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CS_DMA_LEN_STS));
+ for (i = 0; i < slave_rx_len; i++) {
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED,
+ &i2c_bus->slave_dma_buf[i]);
+ }
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CC_BUFF_CTRL));
+ for (i = 0; i < slave_rx_len; i++) {
+ value = readb(i2c_bus->buf_base + i);
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value);
+ }
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ byte_data = AST2600_I2CC_GET_RX_BUFF(readl(i2c_bus->reg_base +
+ AST2600_I2CC_STS_AND_BUFF));
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &byte_data);
+ }
+ if (sts & AST2600_I2CS_STOP)
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value);
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+
+ /* it is Mw data Mr coming -> it need send tx */
+ case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA:
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA:
+ /* it should be repeat start read */
+ if (sts & AST2600_I2CS_SLAVE_MATCH)
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+
+ cmd = SLAVE_TRIGGER_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_TX_DMA_EN;
+ slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CS_DMA_LEN_STS));
+ for (i = 0; i < slave_rx_len; i++) {
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED,
+ &i2c_bus->slave_dma_buf[i]);
+ }
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED,
+ &i2c_bus->slave_dma_buf[0]);
+ writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS);
+ writel(AST2600_I2CS_SET_TX_DMA_LEN(1),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_TX_BUFF_EN;
+ slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CC_BUFF_CTRL));
+ for (i = 0; i < slave_rx_len; i++) {
+ value = readb(i2c_bus->buf_base + i);
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value);
+ }
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &value);
+ writeb(value, i2c_bus->buf_base);
+ writel(AST2600_I2CC_SET_TX_BUF_LEN(1),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ cmd |= AST2600_I2CS_TX_CMD;
+ byte_data = AST2600_I2CC_GET_RX_BUFF(readl(i2c_bus->reg_base +
+ AST2600_I2CC_STS_AND_BUFF));
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &byte_data);
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &byte_data);
+ writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_TX_DMA:
+ /* First Start read */
+ cmd = SLAVE_TRIGGER_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_TX_DMA_EN;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED,
+ &i2c_bus->slave_dma_buf[0]);
+ writel(AST2600_I2CS_SET_TX_DMA_LEN(1),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_TX_BUFF_EN;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &byte_data);
+ writeb(byte_data, i2c_bus->buf_base);
+ writel(AST2600_I2CC_SET_TX_BUF_LEN(1),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ cmd |= AST2600_I2CS_TX_CMD;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &byte_data);
+ writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+
+ case AST2600_I2CS_WAIT_TX_DMA:
+ /* it should be next start read */
+ cmd = SLAVE_TRIGGER_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_TX_DMA_EN;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED,
+ &i2c_bus->slave_dma_buf[0]);
+ writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS);
+ writel(AST2600_I2CS_SET_TX_DMA_LEN(1),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_TX_BUFF_EN;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &value);
+ writeb(value, i2c_bus->buf_base);
+ writel(AST2600_I2CC_SET_TX_BUF_LEN(1),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ cmd |= AST2600_I2CS_TX_CMD;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &byte_data);
+ writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+
+ case AST2600_I2CS_TX_NAK | AST2600_I2CS_STOP:
+ /* it just tx complete */
+ cmd = SLAVE_TRIGGER_CMD;
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value);
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS);
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ break;
+
+ default:
+ dev_dbg(i2c_bus->dev, "todo slave isr case %x, sts %x\n", sts,
+ readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF));
+ break;
+ }
+
+}
+
+static void ast2600_i2c_slave_byte_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts)
+{
+ u32 i2c_buff = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ u32 cmd = AST2600_I2CS_ACTIVE_ALL;
+ u8 byte_data;
+ u8 value;
+
+ switch (sts) {
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA:
+ dev_dbg(i2c_bus->dev, "S : Sw|D\n");
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+ /* first address match is address */
+ byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff);
+ dev_dbg(i2c_bus->dev, "addr [%x]", byte_data);
+ break;
+ case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA:
+ dev_dbg(i2c_bus->dev, "S : D\n");
+ byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff);
+ dev_dbg(i2c_bus->dev, "rx [%x]", byte_data);
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &byte_data);
+ break;
+ case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA:
+ cmd |= AST2600_I2CS_TX_CMD;
+ dev_dbg(i2c_bus->dev, "S : Sr|D\n");
+ byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff);
+ dev_dbg(i2c_bus->dev, "addr : [%02x]", byte_data);
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &byte_data);
+ dev_dbg(i2c_bus->dev, "tx: [%02x]\n", byte_data);
+ writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ break;
+ case AST2600_I2CS_TX_ACK | AST2600_I2CS_WAIT_TX_DMA:
+ cmd |= AST2600_I2CS_TX_CMD;
+ dev_dbg(i2c_bus->dev, "S : D\n");
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &byte_data);
+ dev_dbg(i2c_bus->dev, "tx: [%02x]\n", byte_data);
+ writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ break;
+ case AST2600_I2CS_STOP:
+ case AST2600_I2CS_STOP | AST2600_I2CS_TX_NAK:
+ dev_dbg(i2c_bus->dev, "S : P\n");
+ i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value);
+ break;
+ default:
+ dev_dbg(i2c_bus->dev, "todo no pkt isr %x\n", sts);
+ break;
+ }
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ writel(sts, i2c_bus->reg_base + AST2600_I2CS_ISR);
+ readl(i2c_bus->reg_base + AST2600_I2CS_ISR);
+}
+
+static int ast2600_i2c_slave_irq(struct ast2600_i2c_bus *i2c_bus)
+{
+ u32 ier = readl(i2c_bus->reg_base + AST2600_I2CS_IER);
+ u32 isr = readl(i2c_bus->reg_base + AST2600_I2CS_ISR);
+
+ if (!(isr & ier))
+ return 0;
+ dev_dbg(i2c_bus->dev, "isr %x\n", isr);
+
+ isr &= ~(AST2600_I2CS_ADDR_INDICATE_MASK | AST2600_I2CS_SLAVE_PENDING);
+
+ if (AST2600_I2CS_ADDR1_NAK & isr)
+ isr &= ~AST2600_I2CS_ADDR1_NAK;
+
+ if (AST2600_I2CS_ADDR2_NAK & isr)
+ isr &= ~AST2600_I2CS_ADDR2_NAK;
+
+ if (AST2600_I2CS_ADDR3_NAK & isr)
+ isr &= ~AST2600_I2CS_ADDR3_NAK;
+
+ if (AST2600_I2CS_ADDR_MASK & isr)
+ isr &= ~AST2600_I2CS_ADDR_MASK;
+
+ if (AST2600_I2CS_PKT_DONE & isr)
+ ast2600_i2c_slave_packet_irq(i2c_bus, isr);
+ else
+ ast2600_i2c_slave_byte_irq(i2c_bus, isr);
+
+ return 1;
+}
+#endif
+
+static void ast2600_i2c_do_start(struct ast2600_i2c_bus *i2c_bus)
+{
+ struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index];
+ int xfer_len = 0;
+ int i = 0;
+ u32 cmd;
+
+ cmd = AST2600_I2CM_PKT_EN | AST2600_I2CM_PKT_ADDR(msg->addr) | AST2600_I2CM_START_CMD;
+
+ /* send start */
+ dev_dbg(i2c_bus->dev, "[%d] %sing %d byte%s %s 0x%02x\n",
+ i2c_bus->msgs_index, msg->flags & I2C_M_RD ? "read" : "write",
+ msg->len, msg->len > 1 ? "s" : "",
+ msg->flags & I2C_M_RD ? "from" : "to", msg->addr);
+
+ i2c_bus->master_xfer_cnt = 0;
+ i2c_bus->buf_index = 0;
+
+ if (msg->flags & I2C_M_RD) {
+ cmd |= AST2600_I2CM_RX_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ /* dma mode */
+ cmd |= AST2600_I2CM_RX_DMA_EN;
+
+ if (msg->flags & I2C_M_RECV_LEN) {
+ dev_dbg(i2c_bus->dev, "smbus read\n");
+ xfer_len = 1;
+ } else {
+ if (msg->len > AST2600_I2C_DMA_SIZE) {
+ xfer_len = AST2600_I2C_DMA_SIZE;
+ } else {
+ xfer_len = msg->len;
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "last stop\n");
+ cmd |= MASTER_TRIGGER_LAST_STOP;
+ }
+ }
+ }
+ writel(AST2600_I2CM_SET_RX_DMA_LEN(xfer_len - 1),
+ i2c_bus->reg_base + AST2600_I2CM_DMA_LEN);
+ i2c_bus->master_dma_addr =
+ dma_map_single(i2c_bus->dev, msg->buf, msg->len, DMA_FROM_DEVICE);
+ writel(i2c_bus->master_dma_addr, i2c_bus->reg_base + AST2600_I2CM_RX_DMA);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ /* buff mode */
+ cmd |= AST2600_I2CM_RX_BUFF_EN;
+ if (msg->flags & I2C_M_RECV_LEN) {
+ dev_dbg(i2c_bus->dev, "smbus read\n");
+ xfer_len = 1;
+ } else {
+ if (msg->len > i2c_bus->buf_size) {
+ xfer_len = i2c_bus->buf_size;
+ } else {
+ xfer_len = msg->len;
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "last stop\n");
+ cmd |= MASTER_TRIGGER_LAST_STOP;
+ }
+ }
+ }
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(xfer_len),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ /* byte mode */
+ xfer_len = 1;
+ if (msg->flags & I2C_M_RECV_LEN) {
+ dev_dbg(i2c_bus->dev, "smbus read\n");
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ if (msg->len == 1) {
+ dev_dbg(i2c_bus->dev, "last stop\n");
+ cmd |= MASTER_TRIGGER_LAST_STOP;
+ }
+ }
+ }
+ }
+ } else {
+ if (i2c_bus->mode == DMA_MODE) {
+ /* dma mode */
+ if (msg->len > AST2600_I2C_DMA_SIZE) {
+ xfer_len = AST2600_I2C_DMA_SIZE;
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "with stop\n");
+ cmd |= AST2600_I2CM_STOP_CMD;
+ }
+ xfer_len = msg->len;
+ }
+
+ if (xfer_len) {
+ cmd |= AST2600_I2CM_TX_DMA_EN | AST2600_I2CM_TX_CMD;
+ writel(AST2600_I2CM_SET_TX_DMA_LEN(xfer_len - 1),
+ i2c_bus->reg_base + AST2600_I2CM_DMA_LEN);
+ i2c_bus->master_dma_addr =
+ dma_map_single(i2c_bus->dev, msg->buf, msg->len,
+ DMA_TO_DEVICE);
+ writel(i2c_bus->master_dma_addr,
+ i2c_bus->reg_base + AST2600_I2CM_TX_DMA);
+ }
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ u8 wbuf[4];
+ /* buff mode */
+ if (msg->len > i2c_bus->buf_size) {
+ xfer_len = i2c_bus->buf_size;
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "with stop\n");
+ cmd |= AST2600_I2CM_STOP_CMD;
+ }
+ xfer_len = msg->len;
+ }
+ if (xfer_len) {
+ cmd |= AST2600_I2CM_TX_BUFF_EN | AST2600_I2CM_TX_CMD;
+ writel(AST2600_I2CC_SET_TX_BUF_LEN(xfer_len),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ for (i = 0; i < xfer_len; i++) {
+ wbuf[i % 4] = msg->buf[i];
+ if (i % 4 == 3)
+ writel(*(u32 *)wbuf, i2c_bus->buf_base + i - 3);
+ dev_dbg(i2c_bus->dev, "[%02x]\n", msg->buf[i]);
+ }
+ if (--i % 4 != 3)
+ writel(*(u32 *)wbuf, i2c_bus->buf_base + i - (i % 4));
+ }
+ } else {
+ /* byte mode */
+ if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) && (msg->len <= 1)) {
+ dev_dbg(i2c_bus->dev, "with stop\n");
+ cmd |= AST2600_I2CM_STOP_CMD;
+ }
+
+ if (msg->len) {
+ cmd |= AST2600_I2CM_TX_CMD;
+ xfer_len = 1;
+ dev_dbg(i2c_bus->dev, "w [0] : %02x\n", msg->buf[0]);
+ writel(msg->buf[0], i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ } else {
+ xfer_len = 0;
+ }
+ }
+ }
+ dev_dbg(i2c_bus->dev, "len %d , cmd %x\n", xfer_len, cmd);
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS);
+}
+
+static int ast2600_i2c_is_irq_error(u32 irq_status)
+{
+ if (irq_status & AST2600_I2CM_ARBIT_LOSS)
+ return -EAGAIN;
+ if (irq_status & (AST2600_I2CM_SDA_DL_TO | AST2600_I2CM_SCL_LOW_TO))
+ return -EBUSY;
+ if (irq_status & (AST2600_I2CM_ABNORMAL))
+ return -EPROTO;
+
+ return 0;
+}
+
+static void ast2600_i2c_master_package_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts)
+{
+ struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index];
+ u32 cmd = AST2600_I2CM_PKT_EN;
+ int xfer_len;
+ int i;
+
+ sts &= ~AST2600_I2CM_PKT_DONE;
+ writel(AST2600_I2CM_PKT_DONE, i2c_bus->reg_base + AST2600_I2CM_ISR);
+ switch (sts) {
+ case AST2600_I2CM_PKT_ERROR:
+ dev_dbg(i2c_bus->dev, "M : ERROR only\n");
+ i2c_bus->cmd_err = -EAGAIN;
+ complete(&i2c_bus->cmd_complete);
+ break;
+ case AST2600_I2CM_PKT_ERROR | AST2600_I2CM_TX_NAK: /* a0 fix for issue */
+ fallthrough;
+ case AST2600_I2CM_PKT_ERROR | AST2600_I2CM_TX_NAK | AST2600_I2CM_NORMAL_STOP:
+ dev_dbg(i2c_bus->dev, "M : TX NAK | NORMAL STOP\n");
+ i2c_bus->cmd_err = -ENXIO;
+ complete(&i2c_bus->cmd_complete);
+ break;
+ case AST2600_I2CM_NORMAL_STOP:
+ /* write 0 byte only have stop isr */
+ dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_NORMAL_STOP = %x\n", sts);
+ i2c_bus->msgs_index++;
+ if (i2c_bus->msgs_index < i2c_bus->msgs_count) {
+ ast2600_i2c_do_start(i2c_bus);
+ } else {
+ i2c_bus->cmd_err = i2c_bus->msgs_index;
+ complete(&i2c_bus->cmd_complete);
+ }
+ break;
+ case AST2600_I2CM_TX_ACK:
+ //dev_dbg(i2c_bus->dev, "M : AST2600_I2CM_TX_ACK = %x\n", sts);
+ case AST2600_I2CM_TX_ACK | AST2600_I2CM_NORMAL_STOP:
+ dev_dbg(i2c_bus->dev,
+ "M : AST2600_I2CM_TX_ACK | AST2600_I2CM_NORMAL_STOP= %x\n", sts);
+
+ if (i2c_bus->mode == DMA_MODE)
+ xfer_len = AST2600_I2C_GET_TX_DMA_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CM_DMA_LEN_STS));
+ else if (i2c_bus->mode == BUFF_MODE)
+ xfer_len = AST2600_I2CC_GET_TX_BUF_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CC_BUFF_CTRL));
+ else
+ xfer_len = 1;
+ i2c_bus->master_xfer_cnt += xfer_len;
+
+ if (i2c_bus->master_xfer_cnt == msg->len) {
+ if (i2c_bus->mode == DMA_MODE)
+ dma_unmap_single(i2c_bus->dev, i2c_bus->master_dma_addr, msg->len,
+ DMA_TO_DEVICE);
+
+ i2c_bus->msgs_index++;
+ if (i2c_bus->msgs_index == i2c_bus->msgs_count) {
+ i2c_bus->cmd_err = i2c_bus->msgs_index;
+ complete(&i2c_bus->cmd_complete);
+ } else {
+ ast2600_i2c_do_start(i2c_bus);
+ }
+ } else {
+ /* do next tx */
+ cmd |= AST2600_I2CM_TX_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CM_TX_DMA_EN;
+ xfer_len = msg->len - i2c_bus->master_xfer_cnt;
+ if (xfer_len > AST2600_I2C_DMA_SIZE) {
+ xfer_len = AST2600_I2C_DMA_SIZE;
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "M: STOP\n");
+ cmd |= AST2600_I2CM_STOP_CMD;
+ }
+ }
+ writel(AST2600_I2CM_SET_TX_DMA_LEN(xfer_len - 1),
+ i2c_bus->reg_base + AST2600_I2CM_DMA_LEN);
+ dev_dbg(i2c_bus->dev, "next tx xfer_len: %d, offset %d\n",
+ xfer_len, i2c_bus->master_xfer_cnt);
+ writel(i2c_bus->master_dma_addr + i2c_bus->master_xfer_cnt,
+ i2c_bus->reg_base + AST2600_I2CM_TX_DMA);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ u8 wbuf[4];
+
+ cmd |= AST2600_I2CM_RX_BUFF_EN;
+ xfer_len = msg->len - i2c_bus->master_xfer_cnt;
+ if (xfer_len > i2c_bus->buf_size) {
+ xfer_len = i2c_bus->buf_size;
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "M: STOP\n");
+ cmd |= AST2600_I2CM_STOP_CMD;
+ }
+ }
+ for (i = 0; i < xfer_len; i++) {
+ wbuf[i % 4] = msg->buf[i2c_bus->master_xfer_cnt + i];
+ if (i % 4 == 3)
+ writel(*(u32 *)wbuf, i2c_bus->buf_base + i - 3);
+ dev_dbg(i2c_bus->dev, "[%02x]\n",
+ msg->buf[i2c_bus->master_xfer_cnt + i]);
+ }
+ if (--i % 4 != 3)
+ writel(*(u32 *)wbuf, i2c_bus->buf_base + i - (i % 4));
+
+ writel(AST2600_I2CC_SET_TX_BUF_LEN(xfer_len),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ /* byte */
+ if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) &&
+ ((i2c_bus->master_xfer_cnt + 1) == msg->len)) {
+ dev_dbg(i2c_bus->dev, "M: STOP\n");
+ cmd |= AST2600_I2CM_STOP_CMD;
+ }
+ dev_dbg(i2c_bus->dev, "tx buff[%x]\n",
+ msg->buf[i2c_bus->master_xfer_cnt]);
+ writel(msg->buf[i2c_bus->master_xfer_cnt],
+ i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+ }
+ dev_dbg(i2c_bus->dev, "next tx cmd: %x\n", cmd);
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS);
+ }
+ break;
+ case AST2600_I2CM_RX_DONE:
+#ifdef CONFIG_I2C_SLAVE
+ /* Workaround for master/slave package mode enable rx done stuck issue
+ * When master go for first read (RX_DONE), slave mode will also effect
+ * Then controller will send nack, not operate anymore.
+ */
+ if (readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS) & AST2600_I2CS_PKT_MODE_EN) {
+ u32 slave_cmd = readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+
+ writel(0, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ writel(slave_cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ }
+ fallthrough;
+#endif
+ case AST2600_I2CM_RX_DONE | AST2600_I2CM_NORMAL_STOP:
+ dev_dbg(i2c_bus->dev,
+ "M : AST2600_I2CM_RX_DONE | AST2600_I2CM_NORMAL_STOP = %x\n", sts);
+ /* do next rx */
+ if (i2c_bus->mode == DMA_MODE) {
+ xfer_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base +
+ AST2600_I2CM_DMA_LEN_STS));
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ xfer_len = AST2600_I2CC_GET_RX_BUF_LEN(
+ readl(i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL));
+ for (i = 0; i < xfer_len; i++)
+ msg->buf[i2c_bus->master_xfer_cnt + i] =
+ readb(i2c_bus->buf_base + i);
+ } else {
+ xfer_len = 1;
+ msg->buf[i2c_bus->master_xfer_cnt] =
+ AST2600_I2CC_GET_RX_BUFF(readl(i2c_bus->reg_base +
+ AST2600_I2CC_STS_AND_BUFF));
+ }
+
+ if (msg->flags & I2C_M_RECV_LEN) {
+ dev_dbg(i2c_bus->dev, "smbus first len = %x\n", msg->buf[0]);
+ msg->len = msg->buf[0] + ((msg->flags & I2C_CLIENT_PEC) ? 2 : 1);
+ msg->flags &= ~I2C_M_RECV_LEN;
+ }
+ i2c_bus->master_xfer_cnt += xfer_len;
+ dev_dbg(i2c_bus->dev, "master_xfer_cnt [%d/%d]\n", i2c_bus->master_xfer_cnt,
+ msg->len);
+
+ if (i2c_bus->master_xfer_cnt == msg->len) {
+ if (i2c_bus->mode == DMA_MODE)
+ dma_unmap_single(i2c_bus->dev, i2c_bus->master_dma_addr, msg->len,
+ DMA_FROM_DEVICE);
+
+ for (i = 0; i < msg->len; i++)
+ dev_dbg(i2c_bus->dev, "M: r %d:[%x]\n", i, msg->buf[i]);
+ i2c_bus->msgs_index++;
+ if (i2c_bus->msgs_index == i2c_bus->msgs_count) {
+ i2c_bus->cmd_err = i2c_bus->msgs_index;
+ complete(&i2c_bus->cmd_complete);
+ } else {
+ ast2600_i2c_do_start(i2c_bus);
+ }
+ } else {
+ /* next rx */
+ cmd |= AST2600_I2CM_RX_CMD;
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CM_RX_DMA_EN;
+ xfer_len = msg->len - i2c_bus->master_xfer_cnt;
+ if (xfer_len > AST2600_I2C_DMA_SIZE) {
+ xfer_len = AST2600_I2C_DMA_SIZE;
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "last stop\n");
+ cmd |= MASTER_TRIGGER_LAST_STOP;
+ }
+ }
+ dev_dbg(i2c_bus->dev, "M: next rx len [%d/%d] , cmd %x\n", xfer_len,
+ msg->len, cmd);
+ writel(AST2600_I2CM_SET_RX_DMA_LEN(xfer_len - 1),
+ i2c_bus->reg_base + AST2600_I2CM_DMA_LEN);
+ writel(i2c_bus->master_dma_addr + i2c_bus->master_xfer_cnt,
+ i2c_bus->reg_base + AST2600_I2CM_RX_DMA);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CM_RX_BUFF_EN;
+ xfer_len = msg->len - i2c_bus->master_xfer_cnt;
+ if (xfer_len > i2c_bus->buf_size) {
+ xfer_len = i2c_bus->buf_size;
+ } else {
+ if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) {
+ dev_dbg(i2c_bus->dev, "last stop\n");
+ cmd |= MASTER_TRIGGER_LAST_STOP;
+ }
+ }
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(xfer_len),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) &&
+ ((i2c_bus->master_xfer_cnt + 1) == msg->len)) {
+ dev_dbg(i2c_bus->dev, "last stop\n");
+ cmd |= MASTER_TRIGGER_LAST_STOP;
+ }
+ }
+ dev_dbg(i2c_bus->dev, "M: next rx len %d, cmd %x\n", xfer_len, cmd);
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS);
+ }
+ break;
+ default:
+ dev_dbg(i2c_bus->dev, "todo care sts %x\n", sts);
+ break;
+ }
+}
+
+static int ast2600_i2c_master_irq(struct ast2600_i2c_bus *i2c_bus)
+{
+ u32 sts = readl(i2c_bus->reg_base + AST2600_I2CM_ISR);
+ u32 ier = readl(i2c_bus->reg_base + AST2600_I2CM_IER);
+ u32 ctrl = 0;
+
+ dev_dbg(i2c_bus->dev, "M sts %x\n", sts);
+ if (!i2c_bus->alert_enable)
+ sts &= ~AST2600_I2CM_SMBUS_ALT;
+
+ if (AST2600_I2CM_BUS_RECOVER_FAIL & sts) {
+ dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_BUS_RECOVER_FAIL= %x\n", sts);
+ writel(AST2600_I2CM_BUS_RECOVER_FAIL, i2c_bus->reg_base + AST2600_I2CM_ISR);
+ ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ i2c_bus->cmd_err = -EPROTO;
+ complete(&i2c_bus->cmd_complete);
+ return 1;
+ }
+
+ if (AST2600_I2CM_BUS_RECOVER & sts) {
+ dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_BUS_RECOVER= %x\n", sts);
+ writel(AST2600_I2CM_BUS_RECOVER, i2c_bus->reg_base + AST2600_I2CM_ISR);
+ i2c_bus->cmd_err = 0;
+ complete(&i2c_bus->cmd_complete);
+ return 1;
+ }
+
+ if (AST2600_I2CM_SMBUS_ALT & sts) {
+ if (ier & AST2600_I2CM_SMBUS_ALT) {
+ dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_SMBUS_ALT= %x\n", sts);
+ /* Disable ALT INT */
+ writel(ier & ~AST2600_I2CM_SMBUS_ALT, i2c_bus->reg_base + AST2600_I2CM_IER);
+ i2c_handle_smbus_alert(i2c_bus->ara);
+ writel(AST2600_I2CM_SMBUS_ALT, i2c_bus->reg_base + AST2600_I2CM_ISR);
+ dev_err(i2c_bus->dev,
+ "ast2600_master_alert_recv bus id %d, Disable Alt, Please Imple\n",
+ i2c_bus->adap.nr);
+ return 1;
+ }
+ }
+
+ i2c_bus->cmd_err = ast2600_i2c_is_irq_error(sts);
+ if (i2c_bus->cmd_err) {
+ dev_dbg(i2c_bus->dev, "received error interrupt: 0x%02x\n", sts);
+ writel(AST2600_I2CM_PKT_DONE, i2c_bus->reg_base + AST2600_I2CM_ISR);
+ complete(&i2c_bus->cmd_complete);
+ return 1;
+ }
+
+ if (AST2600_I2CM_PKT_DONE & sts) {
+ ast2600_i2c_master_package_irq(i2c_bus, sts);
+ return 1;
+ }
+
+ if (readl(i2c_bus->reg_base + AST2600_I2CM_ISR)) {
+ dev_dbg(i2c_bus->dev, "master TODO care sts %x\n",
+ readl(i2c_bus->reg_base + AST2600_I2CM_ISR));
+ writel(readl(i2c_bus->reg_base + AST2600_I2CM_ISR),
+ i2c_bus->reg_base + AST2600_I2CM_ISR);
+ }
+
+ return 0;
+}
+
+static irqreturn_t ast2600_i2c_bus_irq(int irq, void *dev_id)
+{
+ struct ast2600_i2c_bus *i2c_bus = dev_id;
+
+#ifdef CONFIG_I2C_SLAVE
+ if (readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) & AST2600_I2CC_SLAVE_EN) {
+ if (ast2600_i2c_slave_irq(i2c_bus)) {
+// dev_dbg(i2c_bus->dev, "bus-%d.slave handle\n", i2c_bus->adap.nr);
+ return IRQ_HANDLED;
+ }
+ }
+#endif
+ return ast2600_i2c_master_irq(i2c_bus) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int ast2600_i2c_master_xfer(struct i2c_adapter *adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(adap);
+ unsigned long timeout;
+
+ /* If bus is busy in a single master environment, attempt recovery. */
+ if (!i2c_bus->multi_master &&
+ (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & AST2600_I2CC_BUS_BUSY_STS)) {
+ int ret;
+
+ ret = ast2600_i2c_recover_bus(i2c_bus);
+ if (ret)
+ return ret;
+ }
+
+ i2c_bus->cmd_err = 0;
+ i2c_bus->msgs = msgs;
+ i2c_bus->msgs_index = 0;
+ i2c_bus->msgs_count = num;
+ reinit_completion(&i2c_bus->cmd_complete);
+ ast2600_i2c_do_start(i2c_bus);
+ timeout = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout);
+ if (timeout == 0) {
+ u32 isr = readl(i2c_bus->reg_base + AST2600_I2CM_ISR);
+ u32 i2c_status = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
+
+ dev_dbg(i2c_bus->dev, "timeout isr[%x], sts[%x]\n", isr, i2c_status);
+ if (isr || (i2c_status & AST2600_I2CC_TX_DIR_MASK)) {
+ u32 ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+
+ writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+#ifdef CONFIG_I2C_SLAVE
+ if (ctrl & AST2600_I2CC_SLAVE_EN) {
+ u32 cmd = SLAVE_TRIGGER_CMD;
+
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(i2c_bus->slave_dma_addr,
+ i2c_bus->reg_base + AST2600_I2CS_RX_DMA);
+ writel(i2c_bus->slave_dma_addr,
+ i2c_bus->reg_base + AST2600_I2CS_TX_DMA);
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+ dev_dbg(i2c_bus->dev, "slave trigger [%x]\n", cmd);
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ }
+#endif
+ }
+ return -ETIMEDOUT;
+ }
+
+ dev_dbg(i2c_bus->dev, "bus%d-m: %d end\n", i2c_bus->adap.nr, i2c_bus->cmd_err);
+
+ return i2c_bus->cmd_err;
+}
+
+static void ast2600_i2c_init(struct ast2600_i2c_bus *i2c_bus)
+{
+ struct platform_device *pdev = to_platform_device(i2c_bus->dev);
+ u32 fun_ctrl = AST2600_I2CC_BUS_AUTO_RELEASE | AST2600_I2CC_MASTER_EN;
+
+ /* I2C Reset */
+ writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+
+ if (of_property_read_bool(pdev->dev.of_node, "multi-master"))
+ i2c_bus->multi_master = true;
+ else
+ fun_ctrl |= AST2600_I2CC_MULTI_MASTER_DIS;
+
+ /* Enable Master Mode */
+ writel(fun_ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ /* disable slave address */
+ writel(0, i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL);
+
+ /* Set AC Timing */
+ writel(ast2600_select_i2c_clock(i2c_bus), i2c_bus->reg_base + AST2600_I2CC_AC_TIMING);
+
+ /* Clear Interrupt */
+ writel(0xfffffff, i2c_bus->reg_base + AST2600_I2CM_ISR);
+
+#ifdef CONFIG_I2C_SLAVE
+ /* for memory buffer initial */
+ if (i2c_bus->mode == DMA_MODE) {
+ i2c_bus->slave_dma_buf = dma_alloc_coherent(i2c_bus->dev, I2C_SLAVE_MSG_BUF_SIZE,
+ &i2c_bus->slave_dma_addr, GFP_KERNEL);
+ if (!i2c_bus->slave_dma_buf)
+ return;
+ }
+
+ writel(0xfffffff, i2c_bus->reg_base + AST2600_I2CS_ISR);
+
+ if (i2c_bus->mode == BYTE_MODE) {
+ writel(0xffff, i2c_bus->reg_base + AST2600_I2CS_IER);
+ } else {
+ /* Set interrupt generation of I2C slave controller */
+ writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER);
+ }
+#endif
+}
+
+#ifdef CONFIG_I2C_SLAVE
+static int ast2600_i2c_reg_slave(struct i2c_client *client)
+{
+ struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(client->adapter);
+ u32 cmd = SLAVE_TRIGGER_CMD;
+
+ if (i2c_bus->slave)
+ return -EINVAL;
+
+ dev_dbg(i2c_bus->dev, "slave addr %x\n", client->addr);
+
+ writel(0, i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL);
+ writel(AST2600_I2CC_SLAVE_EN | readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL),
+ i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+
+ /* trigger rx buffer */
+ if (i2c_bus->mode == DMA_MODE) {
+ cmd |= AST2600_I2CS_RX_DMA_EN;
+ writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_RX_DMA);
+ writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_TX_DMA);
+ writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE),
+ i2c_bus->reg_base + AST2600_I2CS_DMA_LEN);
+ } else if (i2c_bus->mode == BUFF_MODE) {
+ cmd |= AST2600_I2CS_RX_BUFF_EN;
+ writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size),
+ i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL);
+ } else {
+ cmd &= ~AST2600_I2CS_PKT_MODE_EN;
+ }
+
+ writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS);
+ i2c_bus->slave = client;
+ /* Set slave addr. */
+ writel(client->addr | AST2600_I2CS_ADDR1_ENABLE,
+ i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL);
+
+ return 0;
+}
+
+static int ast2600_i2c_unreg_slave(struct i2c_client *slave)
+{
+ struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(slave->adapter);
+
+ WARN_ON(!i2c_bus->slave);
+
+ /* Turn off slave mode. */
+ writel(~AST2600_I2CC_SLAVE_EN & readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL),
+ i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ writel(readl(i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL) & ~AST2600_I2CS_ADDR1_MASK,
+ i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL);
+
+ i2c_bus->slave = NULL;
+
+ return 0;
+}
+#endif
+
+static u32 ast2600_i2c_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+static const struct i2c_algorithm i2c_ast2600_algorithm = {
+ .master_xfer = ast2600_i2c_master_xfer,
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+ .reg_slave = ast2600_i2c_reg_slave,
+ .unreg_slave = ast2600_i2c_unreg_slave,
+#endif
+ .functionality = ast2600_i2c_functionality,
+};
+
+static const struct of_device_id ast2600_i2c_bus_of_table[] = {
+ {
+ .compatible = "aspeed,ast2600-i2c",
+ },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, ast2600_i2c_bus_of_table);
+
+static int ast2600_i2c_probe(struct platform_device *pdev)
+{
+ struct ast2600_i2c_bus *i2c_bus;
+ const struct of_device_id *match;
+ struct resource *res;
+ u32 global_ctrl;
+ int ret = 0;
+
+ i2c_bus = devm_kzalloc(&pdev->dev, sizeof(*i2c_bus), GFP_KERNEL);
+ if (!i2c_bus)
+ return -ENOMEM;
+
+ i2c_bus->global_reg = syscon_regmap_lookup_by_compatible("aspeed,ast2600-i2c-global");
+ if (IS_ERR(i2c_bus->global_reg)) {
+ dev_err(&pdev->dev, "failed to find ast2600 i2c global regmap\n");
+ ret = -ENOMEM;
+ goto free_mem;
+ }
+
+ /* get global control register */
+ regmap_read(i2c_bus->global_reg, AST2600_I2CG_CTRL, &global_ctrl);
+
+ if (global_ctrl & AST2600_I2CG_CTRL_NEW_CLK_DIV)
+ i2c_bus->clk_div_mode = 1;
+
+ if (!(global_ctrl & AST2600_I2CG_CTRL_NEW_REG)) {
+ ret = -ENOENT;
+ /* this driver only supports new reg mode. */
+ dev_err(&pdev->dev, "Expect I2CG0C[2] = 1 (new reg mode)\n");
+ goto free_mem;
+ }
+
+ i2c_bus->mode = DMA_MODE;
+
+ if (of_property_read_bool(pdev->dev.of_node, "byte-mode"))
+ i2c_bus->mode = BYTE_MODE;
+
+ if (of_property_read_bool(pdev->dev.of_node, "buff-mode")) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res && resource_size(res) >= 2)
+ i2c_bus->buf_base = devm_ioremap_resource(&pdev->dev, res);
+
+ if (!IS_ERR_OR_NULL(i2c_bus->buf_base))
+ i2c_bus->buf_size = resource_size(res);
+
+ i2c_bus->mode = BUFF_MODE;
+ }
+
+ if (of_property_read_bool(pdev->dev.of_node, "timeout"))
+ i2c_bus->timeout_enable = 1;
+
+ i2c_bus->dev = &pdev->dev;
+ init_completion(&i2c_bus->cmd_complete);
+
+ i2c_bus->reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(i2c_bus->reg_base)) {
+ ret = PTR_ERR(i2c_bus->reg_base);
+ goto free_mem;
+ }
+
+ i2c_bus->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (i2c_bus->irq < 0) {
+ dev_err(&pdev->dev, "no irq specified\n");
+ ret = -i2c_bus->irq;
+ goto free_irq;
+ }
+
+ match = of_match_node(ast2600_i2c_bus_of_table, pdev->dev.of_node);
+ if (!match) {
+ ret = -ENOENT;
+ goto free_irq;
+ }
+
+ platform_set_drvdata(pdev, i2c_bus);
+
+ i2c_bus->clk = devm_clk_get(i2c_bus->dev, NULL);
+ if (IS_ERR(i2c_bus->clk)) {
+ dev_err(i2c_bus->dev, "no clock defined\n");
+ ret = -ENODEV;
+ goto free_irq;
+ }
+ i2c_bus->apb_clk = clk_get_rate(i2c_bus->clk);
+ dev_dbg(i2c_bus->dev, "i2c_bus->apb_clk %d\n", i2c_bus->apb_clk);
+
+ ret = of_property_read_u32(pdev->dev.of_node, "bus-frequency", &i2c_bus->bus_frequency);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not read bus-frequency property\n");
+ i2c_bus->bus_frequency = 100000;
+ }
+
+ /* Initialize the I2C adapter */
+ i2c_bus->adap.owner = THIS_MODULE;
+ i2c_bus->adap.algo = &i2c_ast2600_algorithm;
+ i2c_bus->adap.retries = 0;
+ i2c_bus->adap.dev.parent = i2c_bus->dev;
+ i2c_bus->adap.dev.of_node = pdev->dev.of_node;
+ i2c_bus->adap.algo_data = i2c_bus;
+ strscpy(i2c_bus->adap.name, pdev->name, sizeof(i2c_bus->adap.name));
+ i2c_set_adapdata(&i2c_bus->adap, i2c_bus);
+
+ ast2600_i2c_init(i2c_bus);
+
+ ret = devm_request_irq(&pdev->dev, i2c_bus->irq, ast2600_i2c_bus_irq, 0,
+ dev_name(&pdev->dev), i2c_bus);
+ if (ret < 0)
+ goto unmap;
+
+ if (of_property_read_bool(pdev->dev.of_node, "smbus-alert")) {
+ i2c_bus->alert_enable = 1;
+ i2c_bus->ara = i2c_new_smbus_alert_device(&i2c_bus->adap, &i2c_bus->alert_data);
+ if (!i2c_bus->ara)
+ dev_warn(i2c_bus->dev, "Failed to register ARA client\n");
+
+ writel(AST2600_I2CM_PKT_DONE | AST2600_I2CM_BUS_RECOVER | AST2600_I2CM_SMBUS_ALT,
+ i2c_bus->reg_base + AST2600_I2CM_IER);
+ } else {
+ i2c_bus->alert_enable = 0;
+ /* Set interrupt generation of I2C master controller */
+ writel(AST2600_I2CM_PKT_DONE | AST2600_I2CM_BUS_RECOVER,
+ i2c_bus->reg_base + AST2600_I2CM_IER);
+ }
+
+ ret = i2c_add_adapter(&i2c_bus->adap);
+ if (ret < 0)
+ goto unmap;
+
+ dev_info(i2c_bus->dev, "%s [%d]: adapter [%d khz] mode [%d]\n",
+ pdev->dev.of_node->name, i2c_bus->adap.nr, i2c_bus->bus_frequency / 1000,
+ i2c_bus->mode);
+
+ return 0;
+
+unmap:
+ free_irq(i2c_bus->irq, i2c_bus);
+free_irq:
+ devm_iounmap(&pdev->dev, i2c_bus->reg_base);
+free_mem:
+ kfree(i2c_bus);
+ return ret;
+}
+
+static int ast2600_i2c_remove(struct platform_device *pdev)
+{
+ struct ast2600_i2c_bus *i2c_bus = platform_get_drvdata(pdev);
+
+ /* Disable everything. */
+ writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
+ writel(0, i2c_bus->reg_base + AST2600_I2CM_IER);
+
+ free_irq(i2c_bus->irq, i2c_bus);
+
+ platform_set_drvdata(pdev, NULL);
+ i2c_del_adapter(&i2c_bus->adap);
+
+ kfree(i2c_bus);
+
+ return 0;
+}
+
+static struct platform_driver ast2600_i2c_bus_driver = {
+ .probe = ast2600_i2c_probe,
+ .remove = ast2600_i2c_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = ast2600_i2c_bus_of_table,
+ },
+};
+module_platform_driver(ast2600_i2c_bus_driver);
+
+MODULE_AUTHOR("Ryan Chen <ryan_chen at aspeedtech.com>");
+MODULE_DESCRIPTION("ASPEED AST2600 I2C Controller Driver");
+MODULE_LICENSE("GPL");
--
2.17.1
More information about the linux-arm-kernel
mailing list