[patch v22 2/4] drivers: jtag: Add Aspeed SoC 24xx and 25xx families JTAG master driver

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Driver adds support of Aspeed 2500/2400 series SOC JTAG master controller.

Driver implements the following jtag ops:
- freq_get;
- freq_set;
- status_get;
- idle;
- xfer;

It has been tested on Mellanox system with BMC equipped with
Aspeed 2520 SoC for programming CPLD devices.

Signed-off-by: Oleksandr Shamray <oleksandrs@xxxxxxxxxxxx>
Signed-off-by: Jiri Pirko <jiri@xxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Philippe Ombredanne <pombredanne@xxxxxxxx>
Acked-by: Joel Stanley <joel@xxxxxxxxx>
---
v21->v22
Comments pointed by Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
- rearrange ASPEED register defines
- simplified JTAG divider calculation formula
- change delay function in bit-bang operation
- add helper functions for TAP states switching
- remove unnecessary comments
- remove redundant debug messages
- make dines for repetative register bit sets
- fixed indentation
- change checks from negative to positive
- add error check for clk_prepare_enable
- rework driver alloc/register to devm_ variant
- Increasing line length up to 85 in order to improve readability

v20->v21
v19->v20
Notifications from kbuild test robot <lkp@xxxxxxxxx>
- add static declaration to 'aspeed_jtag_init' and
  'aspeed_jtag_deinit' functions

v18->v19
v17->v18
v16->v17
v15->v16
Comments pointed by Joel Stanley <joel.stan@xxxxxxxxx>
- Add reset_control on Jtag init/deinit

v14->v15
Comments pointed by Joel Stanley <joel.stan@xxxxxxxxx>
- Add ARCH_ASPEED || COMPILE_TEST to Kconfig
- remove unused offset variable
- remove "aspeed_jtag" from dev_err and dev_dbg messages
- change clk_prepare_enable initialisation order

v13->v14
Comments pointed by Philippe Ombredanne <pombredanne@xxxxxxxx>
- Change style of head block comment from /**/ to //

v12->v13
Comments pointed by Philippe Ombredanne <pombredanne@xxxxxxxx>
- Change jtag-aspeed.c licence type to
  SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
  and reorder line with license- add reset descriptions in bndings file
 in description
Comments pointed by Kun Yi <kunyi@xxxxxxxxxx>
- Changed capability check for aspeed,ast2400-jtag/ast200-jtag

v11->v12
Comments pointed by Chip Bilbrey <chip@xxxxxxxxxxx>
- Remove access mode from xfer and idle transactions
- Add new ioctl JTAG_SIOCMODE for set hw mode

v10->v11
v9->v10
V8->v9
Comments pointed by Arnd Bergmann <arnd@xxxxxxxx>
- add *data parameter to xfer function prototype

v7->v8
Comments pointed by Joel Stanley <joel.stan@xxxxxxxxx>
- aspeed_jtag_init replace goto to return;
- change input variables type from __u32 to u32
  in functios freq_get, freq_set, status_get
- change sm_ variables type from char to u8
- in jatg_init add disable clocks on error case
- remove release_mem_region on error case
- remove devm_free_irq on jtag_deinit
- Fix misspelling Disabe/Disable
- Change compatible string to ast2400 and ast2000

v6->v7
Notifications from kbuild test robot <lkp@xxxxxxxxx>
- Add include <linux/types.h> to jtag-asapeed.c

v5->v6
v4->v5
Comments pointed by Arnd Bergmann <arnd@xxxxxxxx>
- Added HAS_IOMEM dependence in Kconfig to avoid
  "undefined reference to `devm_ioremap_resource'" error,
  because in some arch this not supported

v3->v4
Comments pointed by Arnd Bergmann <arnd@xxxxxxxx>
- change transaction pointer tdio type  to __u64
- change internal status type from enum to __u32

v2->v3

v1->v2
Comments pointed by Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
- change license type from GPLv2/BSD to GPLv2

Comments pointed by Neil Armstrong <narmstrong@xxxxxxxxxxxx>
- Add clk_prepare_enable/clk_disable_unprepare in clock init/deinit
- Change .compatible to soc-specific compatible names
  aspeed,aspeed4000-jtag/aspeed5000-jtag
- Added dt-bindings

Comments pointed by Arnd Bergmann <arnd@xxxxxxxx>
- Reorder functions and removed the forward declarations
- Add static const qualifier to state machine states transitions
- Change .compatible to soc-specific compatible names
  aspeed,aspeed4000-jtag/aspeed5000-jtag
- Add dt-bindings

Comments pointed by Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
- Change module name jtag-aspeed in description in Kconfig

Comments pointed by kbuild test robot <lkp@xxxxxxxxx>
- Remove invalid include <asm/mach-types.h>
- add resource_size instead of calculation
---
 drivers/jtag/Kconfig       |   14 +
 drivers/jtag/Makefile      |    1 +
 drivers/jtag/jtag-aspeed.c |  769 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 784 insertions(+), 0 deletions(-)
 create mode 100644 drivers/jtag/jtag-aspeed.c

diff --git a/drivers/jtag/Kconfig b/drivers/jtag/Kconfig
index 47771fc..0cc163f 100644
--- a/drivers/jtag/Kconfig
+++ b/drivers/jtag/Kconfig
@@ -15,3 +15,17 @@ menuconfig JTAG
 
 	  To compile this driver as a module, choose M here: the module will
 	  be called jtag.
+
+menuconfig JTAG_ASPEED
+	tristate "Aspeed SoC JTAG controller support"
+	depends on JTAG && HAS_IOMEM
+	depends on ARCH_ASPEED || COMPILE_TEST
+	help
+	  This provides a support for Aspeed JTAG device, equipped on
+	  Aspeed SoC 24xx and 25xx families. Drivers allows programming
+	  of hardware devices, connected to SoC through the JTAG interface.
+
+	  If you want this support, you should say Y here.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called jtag-aspeed.
diff --git a/drivers/jtag/Makefile b/drivers/jtag/Makefile
index af37493..04a855e 100644
--- a/drivers/jtag/Makefile
+++ b/drivers/jtag/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_JTAG)		+= jtag.o
+obj-$(CONFIG_JTAG_ASPEED)	+= jtag-aspeed.o
diff --git a/drivers/jtag/jtag-aspeed.c b/drivers/jtag/jtag-aspeed.c
new file mode 100644
index 0000000..b3559f8
--- /dev/null
+++ b/drivers/jtag/jtag-aspeed.c
@@ -0,0 +1,769 @@
+// SPDX-License-Identifier: GPL-2.0
+// drivers/jtag/aspeed-jtag.c
+//
+// Copyright (c) 2018 Mellanox Technologies. All rights reserved.
+// Copyright (c) 2018 Oleksandr Shamray <oleksandrs@xxxxxxxxxxxx>
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/jtag.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <uapi/linux/jtag.h>
+
+#define ASPEED_JTAG_DATA		0x00
+#define ASPEED_JTAG_INST		0x04
+#define ASPEED_JTAG_CTRL		0x08
+#define ASPEED_JTAG_ISR			0x0C
+#define ASPEED_JTAG_SW			0x10
+#define ASPEED_JTAG_TCK			0x14
+#define ASPEED_JTAG_EC			0x18
+
+#define ASPEED_JTAG_DATA_MSB		0x01
+#define ASPEED_JTAG_DATA_CHUNK_SIZE	0x20
+
+/* ASPEED_JTAG_CTRL: Engine Control */
+#define ASPEED_JTAG_CTL_ENG_EN		BIT(31)
+#define ASPEED_JTAG_CTL_ENG_OUT_EN	BIT(30)
+#define ASPEED_JTAG_CTL_FORCE_TMS	BIT(29)
+#define ASPEED_JTAG_CTL_INST_LEN(x)	((x) << 20)
+#define ASPEED_JTAG_CTL_LASPEED_INST	BIT(17)
+#define ASPEED_JTAG_CTL_INST_EN		BIT(16)
+#define ASPEED_JTAG_CTL_DR_UPDATE	BIT(10)
+#define ASPEED_JTAG_CTL_DATA_LEN(x)	((x) << 4)
+#define ASPEED_JTAG_CTL_LASPEED_DATA	BIT(1)
+#define ASPEED_JTAG_CTL_DATA_EN		BIT(0)
+
+/* ASPEED_JTAG_ISR : Interrupt status and enable */
+#define ASPEED_JTAG_ISR_INST_PAUSE	BIT(19)
+#define ASPEED_JTAG_ISR_INST_COMPLETE	BIT(18)
+#define ASPEED_JTAG_ISR_DATA_PAUSE	BIT(17)
+#define ASPEED_JTAG_ISR_DATA_COMPLETE	BIT(16)
+#define ASPEED_JTAG_ISR_INST_PAUSE_EN	BIT(3)
+#define ASPEED_JTAG_ISR_INST_COMPLETE_EN BIT(2)
+#define ASPEED_JTAG_ISR_DATA_PAUSE_EN	BIT(1)
+#define ASPEED_JTAG_ISR_DATA_COMPLETE_EN BIT(0)
+#define ASPEED_JTAG_ISR_INT_EN_MASK	GENMASK(3, 0)
+#define ASPEED_JTAG_ISR_INT_MASK	GENMASK(19, 16)
+
+/* ASPEED_JTAG_SW : Software Mode and Status */
+#define ASPEED_JTAG_SW_MODE_EN		BIT(19)
+#define ASPEED_JTAG_SW_MODE_TCK		BIT(18)
+#define ASPEED_JTAG_SW_MODE_TMS		BIT(17)
+#define ASPEED_JTAG_SW_MODE_TDIO	BIT(16)
+
+/* ASPEED_JTAG_TCK : TCK Control */
+#define ASPEED_JTAG_TCK_DIVISOR_MASK	GENMASK(10, 0)
+#define ASPEED_JTAG_TCK_GET_DIV(x)	((x) & ASPEED_JTAG_TCK_DIVISOR_MASK)
+
+/* ASPEED_JTAG_EC : Controller set for go to IDLE */
+#define ASPEED_JTAG_EC_GO_IDLE		BIT(0)
+
+#define ASPEED_JTAG_IOUT_LEN(len) \
+	(ASPEED_JTAG_CTL_ENG_EN | \
+	 ASPEED_JTAG_CTL_ENG_OUT_EN | \
+	 ASPEED_JTAG_CTL_INST_LEN(len))
+
+#define ASPEED_JTAG_DOUT_LEN(len) \
+	(ASPEED_JTAG_CTL_ENG_EN | \
+	 ASPEED_JTAG_CTL_ENG_OUT_EN | \
+	 ASPEED_JTAG_CTL_DATA_LEN(len))
+
+#define ASPEED_JTAG_SW_TDIO (ASPEED_JTAG_SW_MODE_EN | ASPEED_JTAG_SW_MODE_TDIO)
+
+#define ASPEED_JTAG_GET_TDI(direction, byte) \
+	((direction == JTAG_READ_XFER) ? UINT_MAX : byte)
+
+#define ASPEED_JTAG_TCK_WAIT		10
+#define ASPEED_JTAG_RESET_CNTR		10
+
+#define ASPEED_JTAG_NAME		"jtag-aspeed"
+
+struct aspeed_jtag {
+	void __iomem			*reg_base;
+	struct device			*dev;
+	struct clk			*pclk;
+	enum jtag_endstate		status;
+	int				irq;
+	struct reset_control		*rst;
+	u32				flag;
+	wait_queue_head_t		jtag_wq;
+	u32				mode;
+};
+
+static char *end_status_str[] = {"idle", "ir pause", "drpause"};
+
+static u32 aspeed_jtag_read(struct aspeed_jtag *aspeed_jtag, u32 reg)
+{
+	return readl(aspeed_jtag->reg_base + reg);
+}
+
+static void
+aspeed_jtag_write(struct aspeed_jtag *aspeed_jtag, u32 val, u32 reg)
+{
+	writel(val, aspeed_jtag->reg_base + reg);
+}
+
+static int aspeed_jtag_freq_set(struct jtag *jtag, u32 freq)
+{
+	struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
+	unsigned long apb_frq;
+	u32 tck_val;
+	u16 div;
+
+	apb_frq = clk_get_rate(aspeed_jtag->pclk);
+	if (!apb_frq)
+		return -ENOTSUPP;
+
+	div = (apb_frq - 1) / freq;
+	tck_val = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_TCK);
+	aspeed_jtag_write(aspeed_jtag,
+			  (tck_val & ASPEED_JTAG_TCK_DIVISOR_MASK) | div,
+			  ASPEED_JTAG_TCK);
+	return 0;
+}
+
+static int aspeed_jtag_freq_get(struct jtag *jtag, u32 *frq)
+{
+	struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
+	u32 pclk;
+	u32 tck;
+
+	pclk = clk_get_rate(aspeed_jtag->pclk);
+	tck = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_TCK);
+	*frq = pclk / (ASPEED_JTAG_TCK_GET_DIV(tck) + 1);
+
+	return 0;
+}
+
+static int aspeed_jtag_mode_set(struct jtag *jtag, u32 mode)
+{
+	struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
+
+	aspeed_jtag->mode = mode;
+	return 0;
+}
+
+static void aspeed_jtag_sw_delay(struct aspeed_jtag *aspeed_jtag, int cnt)
+{
+	int i;
+
+	for (i = 0; i < cnt; i++)
+		aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_SW);
+}
+
+static char aspeed_jtag_tck_cycle(struct aspeed_jtag *aspeed_jtag,
+				  u8 tms, u8 tdi)
+{
+	char tdo = 0;
+
+	/* TCK = 0 */
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN |
+			  (tms * ASPEED_JTAG_SW_MODE_TMS) |
+			  (tdi * ASPEED_JTAG_SW_MODE_TDIO), ASPEED_JTAG_SW);
+
+	ndelay(ASPEED_JTAG_TCK_WAIT);
+	aspeed_jtag_sw_delay(aspeed_jtag, ASPEED_JTAG_TCK_WAIT);
+
+	/* TCK = 1 */
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN |
+			  ASPEED_JTAG_SW_MODE_TCK |
+			  (tms * ASPEED_JTAG_SW_MODE_TMS) |
+			  (tdi * ASPEED_JTAG_SW_MODE_TDIO), ASPEED_JTAG_SW);
+
+	if (aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_SW) &
+	    ASPEED_JTAG_SW_MODE_TDIO)
+		tdo = 1;
+
+	aspeed_jtag_sw_delay(aspeed_jtag, ASPEED_JTAG_TCK_WAIT);
+
+	/* TCK = 0 */
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN |
+			  (tms * ASPEED_JTAG_SW_MODE_TMS) |
+			  (tdi * ASPEED_JTAG_SW_MODE_TDIO), ASPEED_JTAG_SW);
+	return tdo;
+}
+
+static void aspeed_jtag_wait_instruction_pause(struct aspeed_jtag *aspeed_jtag)
+{
+	wait_event_interruptible(aspeed_jtag->jtag_wq,
+				 aspeed_jtag->flag &  ASPEED_JTAG_ISR_INST_PAUSE);
+	aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_INST_PAUSE;
+}
+
+static void
+aspeed_jtag_wait_instruction_complete(struct aspeed_jtag *aspeed_jtag)
+{
+	wait_event_interruptible(aspeed_jtag->jtag_wq,
+				 aspeed_jtag->flag & ASPEED_JTAG_ISR_INST_COMPLETE);
+	aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_INST_COMPLETE;
+}
+
+static void
+aspeed_jtag_wait_data_pause_complete(struct aspeed_jtag *aspeed_jtag)
+{
+	wait_event_interruptible(aspeed_jtag->jtag_wq,
+				 aspeed_jtag->flag & ASPEED_JTAG_ISR_DATA_PAUSE);
+	aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_DATA_PAUSE;
+}
+
+static void aspeed_jtag_wait_data_complete(struct aspeed_jtag *aspeed_jtag)
+{
+	wait_event_interruptible(aspeed_jtag->jtag_wq,
+				 aspeed_jtag->flag & ASPEED_JTAG_ISR_DATA_COMPLETE);
+	aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_DATA_COMPLETE;
+}
+
+static void aspeed_jtag_sm_cycle(struct aspeed_jtag *aspeed_jtag,
+				 const u8 *tms, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		aspeed_jtag_tck_cycle(aspeed_jtag, tms[i], 0);
+}
+
+static void aspeed_jtag_run_idle(struct aspeed_jtag *aspeed_jtag,
+				 struct jtag_run_test_idle *runtest)
+{
+	static const u8 sm_idle_irpause[] = {1, 1, 0, 1, 0};
+	static const u8 sm_idle_drpause[] = {1, 0, 1, 0};
+
+	switch (runtest->endstate) {
+	case JTAG_STATE_PAUSEIR:
+		/* ->DRSCan->IRSCan->IRCap->IRExit1->PauseIR */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_idle_irpause,
+				     sizeof(sm_idle_irpause));
+		aspeed_jtag->status = JTAG_STATE_PAUSEIR;
+		break;
+	case JTAG_STATE_PAUSEDR:
+		/* ->DRSCan->DRCap->DRExit1->PauseDR */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_idle_drpause,
+				     sizeof(sm_idle_drpause));
+
+		aspeed_jtag->status = JTAG_STATE_PAUSEDR;
+		break;
+	case JTAG_STATE_IDLE:
+		/* IDLE */
+		aspeed_jtag_tck_cycle(aspeed_jtag, 0, 0);
+		aspeed_jtag->status = JTAG_STATE_IDLE;
+		break;
+	default:
+		break;
+	}
+}
+
+static void aspeed_jtag_run_pause(struct aspeed_jtag *aspeed_jtag,
+				  struct jtag_run_test_idle *runtest)
+{
+	static const u8 sm_pause_irpause[] = {1, 1, 1, 1, 0, 1, 0};
+	static const u8 sm_pause_drpause[] = {1, 1, 1, 0, 1, 0};
+	static const u8 sm_pause_idle[] = {1, 1, 0};
+
+	/* From IR/DR Pa.use */
+	switch (runtest->endstate) {
+	case JTAG_STATE_PAUSEIR:
+		/*
+		 * to Exit2 IR/DR->Updt IR/DR->DRSCan->IRSCan->IRCap->
+		 * IRExit1->PauseIR
+		 */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_irpause,
+				     sizeof(sm_pause_irpause));
+
+		aspeed_jtag->status = JTAG_STATE_PAUSEIR;
+		break;
+	case JTAG_STATE_PAUSEDR:
+		/*
+		 * to Exit2 IR/DR->Updt IR/DR->DRSCan->DRCap->
+		 * DRExit1->PauseDR
+		 */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_drpause,
+				     sizeof(sm_pause_drpause));
+		aspeed_jtag->status = JTAG_STATE_PAUSEDR;
+		break;
+	case JTAG_STATE_IDLE:
+		/* to Exit2 IR/DR->Updt IR/DR->IDLE */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_idle,
+				     sizeof(sm_pause_idle));
+		aspeed_jtag->status = JTAG_STATE_IDLE;
+		break;
+	default:
+		break;
+	}
+}
+
+static void aspeed_jtag_run_test_idle_sw(struct aspeed_jtag *aspeed_jtag,
+					 struct jtag_run_test_idle *runtest)
+{
+	int i;
+
+	/* SW mode from idle/pause-> to pause/idle */
+	if (runtest->reset) {
+		for (i = 0; i < ASPEED_JTAG_RESET_CNTR; i++)
+			aspeed_jtag_tck_cycle(aspeed_jtag, 1, 0);
+	}
+
+	switch (aspeed_jtag->status) {
+	case JTAG_STATE_IDLE:
+		aspeed_jtag_run_idle(aspeed_jtag, runtest);
+		break;
+
+	case JTAG_STATE_PAUSEIR:
+	/* Fall-through */
+	case JTAG_STATE_PAUSEDR:
+		aspeed_jtag_run_pause(aspeed_jtag, runtest);
+		break;
+
+	default:
+		dev_err(aspeed_jtag->dev, "aspeed_jtag_run_test_idle error\n");
+		break;
+	}
+
+	/* Stay on IDLE for at least  TCK cycle */
+	for (i = 0; i < runtest->tck; i++)
+		aspeed_jtag_tck_cycle(aspeed_jtag, 0, 0);
+}
+
+static int aspeed_jtag_idle(struct jtag *jtag,
+			    struct jtag_run_test_idle *runtest)
+{
+	struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
+
+	dev_dbg(aspeed_jtag->dev, "runtest, status:%d, mode:%s, state:%s, reset:%d, tck:%d\n",
+		aspeed_jtag->status,
+		aspeed_jtag->mode & JTAG_XFER_HW_MODE ? "HW" : "SW",
+		end_status_str[runtest->endstate], runtest->reset,
+		runtest->tck);
+
+	if (!(aspeed_jtag->mode & JTAG_XFER_HW_MODE)) {
+		aspeed_jtag_run_test_idle_sw(aspeed_jtag, runtest);
+		return 0;
+	}
+
+	/* Disable sw mode */
+	aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_SW);
+	/* x TMS high + 1 TMS low */
+	if (runtest->reset)
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_CTL_ENG_EN |
+				  ASPEED_JTAG_CTL_ENG_OUT_EN |
+				  ASPEED_JTAG_CTL_FORCE_TMS, ASPEED_JTAG_CTRL);
+	else
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_EC_GO_IDLE,
+				  ASPEED_JTAG_EC);
+
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_TDIO, ASPEED_JTAG_SW);
+
+	aspeed_jtag->status = JTAG_STATE_IDLE;
+	return 0;
+}
+
+static void aspeed_jtag_xfer_sw(struct aspeed_jtag *aspeed_jtag,
+				struct jtag_xfer *xfer, u32 *data)
+{
+	static const u8 sm_update_shiftir[] = { 1, 1, 0, 0 };
+	static const u8 sm_update_shiftdr[] = { 1, 0, 0 };
+	static const u8 sm_pause_idle[] = { 1, 1, 0 };
+	static const u8 sm_pause_update[] = { 1, 1 };
+	unsigned long remain_xfer = xfer->length;
+	unsigned long shift_bits = 0;
+	unsigned long index = 0;
+	unsigned long tdi;
+	char tdo;
+
+	if (aspeed_jtag->status != JTAG_STATE_IDLE) {
+		/*IR/DR Pause->Exit2 IR / DR->Update IR /DR */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_update,
+				     sizeof(sm_pause_update));
+	}
+
+	if (xfer->type == JTAG_SIR_XFER)
+		/* ->IRSCan->CapIR->ShiftIR */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_update_shiftir,
+				     sizeof(sm_update_shiftir));
+	else
+		/* ->DRScan->DRCap->DRShift */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_update_shiftdr,
+				     sizeof(sm_update_shiftdr));
+
+	tdi = ASPEED_JTAG_GET_TDI(xfer->direction, data[index]);
+
+	while (remain_xfer > 1) {
+		tdo = aspeed_jtag_tck_cycle(aspeed_jtag, 0,
+					    tdi & ASPEED_JTAG_DATA_MSB);
+		data[index] |= tdo << (shift_bits %
+					    ASPEED_JTAG_DATA_CHUNK_SIZE);
+
+		tdi >>= 1;
+		shift_bits++;
+		remain_xfer--;
+
+		if (shift_bits % ASPEED_JTAG_DATA_CHUNK_SIZE == 0) {
+			tdo = 0;
+			index++;
+
+			tdi = ASPEED_JTAG_GET_TDI(xfer->direction, data[index]);
+		}
+	}
+
+	tdo = aspeed_jtag_tck_cycle(aspeed_jtag, 1, tdi & ASPEED_JTAG_DATA_MSB);
+	data[index] |= tdo << (shift_bits % ASPEED_JTAG_DATA_CHUNK_SIZE);
+
+	/* DIPause/DRPause */
+	aspeed_jtag_tck_cycle(aspeed_jtag, 0, 0);
+
+	if (xfer->endstate == JTAG_STATE_IDLE) {
+		/* ->DRExit2->DRUpdate->IDLE */
+		aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_idle,
+				     sizeof(sm_pause_idle));
+	}
+}
+
+static void aspeed_jtag_xfer_push_data(struct aspeed_jtag *aspeed_jtag,
+				       enum jtag_xfer_type type, u32 bits_len)
+{
+	if (type == JTAG_SIR_XFER) {
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_IOUT_LEN(bits_len),
+				  ASPEED_JTAG_CTRL);
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_DOUT_LEN(bits_len) |
+				  ASPEED_JTAG_CTL_INST_EN, ASPEED_JTAG_CTRL);
+	} else {
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_DOUT_LEN(bits_len),
+				  ASPEED_JTAG_CTRL);
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_DOUT_LEN(bits_len) |
+				  ASPEED_JTAG_CTL_DATA_EN, ASPEED_JTAG_CTRL);
+	}
+}
+
+static void aspeed_jtag_xfer_push_data_last(struct aspeed_jtag *aspeed_jtag,
+					    enum jtag_xfer_type type,
+					    u32 shift_bits,
+					    enum jtag_endstate endstate)
+{
+	if (endstate == JTAG_STATE_IDLE) {
+		if (type == JTAG_SIR_XFER) {
+			dev_dbg(aspeed_jtag->dev, "IR Keep Pause\n");
+
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_IOUT_LEN(shift_bits),
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_IOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_INST_EN,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_wait_instruction_pause(aspeed_jtag);
+		} else {
+			dev_dbg(aspeed_jtag->dev, "DR Keep Pause\n");
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_DOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_DR_UPDATE,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_DOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_DR_UPDATE |
+					  ASPEED_JTAG_CTL_DATA_EN,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_wait_data_pause_complete(aspeed_jtag);
+		}
+	} else {
+		if (type == JTAG_SIR_XFER) {
+			dev_dbg(aspeed_jtag->dev, "IR go IDLE\n");
+
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_IOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_LASPEED_INST,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_IOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_LASPEED_INST |
+					  ASPEED_JTAG_CTL_INST_EN,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_wait_instruction_complete(aspeed_jtag);
+		} else {
+			dev_dbg(aspeed_jtag->dev, "DR go IDLE\n");
+
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_DOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_LASPEED_DATA,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_write(aspeed_jtag,
+					  ASPEED_JTAG_DOUT_LEN(shift_bits) |
+					  ASPEED_JTAG_CTL_LASPEED_DATA |
+					  ASPEED_JTAG_CTL_DATA_EN,
+					  ASPEED_JTAG_CTRL);
+			aspeed_jtag_wait_data_complete(aspeed_jtag);
+		}
+	}
+}
+
+static void aspeed_jtag_xfer_hw(struct aspeed_jtag *aspeed_jtag,
+				struct jtag_xfer *xfer, u32 *data)
+{
+	unsigned long remain_xfer = xfer->length;
+	unsigned long index = 0;
+	char shift_bits;
+	u32 data_reg;
+
+	data_reg = xfer->type == JTAG_SIR_XFER ?
+		   ASPEED_JTAG_INST : ASPEED_JTAG_DATA;
+	while (remain_xfer) {
+		if (xfer->direction == JTAG_WRITE_XFER)
+			aspeed_jtag_write(aspeed_jtag, data[index], data_reg);
+		else
+			aspeed_jtag_write(aspeed_jtag, 0, data_reg);
+
+		if (remain_xfer > ASPEED_JTAG_DATA_CHUNK_SIZE) {
+			shift_bits = ASPEED_JTAG_DATA_CHUNK_SIZE;
+
+			/*
+			 * Read bytes were not equals to column length
+			 * and go to Pause-DR
+			 */
+			aspeed_jtag_xfer_push_data(aspeed_jtag, xfer->type,
+						   shift_bits);
+		} else {
+			/*
+			 * Read bytes equals to column length =>
+			 * Update-DR
+			 */
+			shift_bits = remain_xfer;
+			aspeed_jtag_xfer_push_data_last(aspeed_jtag, xfer->type,
+							shift_bits,
+							xfer->endstate);
+		}
+
+		if (xfer->direction == JTAG_READ_XFER) {
+			if (shift_bits < ASPEED_JTAG_DATA_CHUNK_SIZE) {
+				data[index] = aspeed_jtag_read(aspeed_jtag,
+							       data_reg);
+
+				data[index] >>= ASPEED_JTAG_DATA_CHUNK_SIZE -
+								shift_bits;
+			} else {
+				data[index] = aspeed_jtag_read(aspeed_jtag,
+							       data_reg);
+			}
+		}
+
+		remain_xfer = remain_xfer - shift_bits;
+		index++;
+	}
+}
+
+static int aspeed_jtag_xfer(struct jtag *jtag, struct jtag_xfer *xfer,
+			    u8 *xfer_data)
+{
+	struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
+
+	dev_dbg(aspeed_jtag->dev, " %s %s xfer, mode:%s, END:%d, len:%d\n",
+		xfer->type == JTAG_SIR_XFER ? "SIR" : "SDR",
+		xfer->direction == JTAG_READ_XFER ? "READ" : "WRITE",
+		aspeed_jtag->mode & JTAG_XFER_HW_MODE ? "HW" : "SW",
+		xfer->endstate, xfer->length);
+
+	if (!(aspeed_jtag->mode & JTAG_XFER_HW_MODE)) {
+		/* SW mode */
+		aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_TDIO, ASPEED_JTAG_SW);
+
+		aspeed_jtag_xfer_sw(aspeed_jtag, xfer, (u32 *)xfer_data);
+	} else {
+		/* HW mode */
+		aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_SW);
+		aspeed_jtag_xfer_hw(aspeed_jtag, xfer, (u32 *)xfer_data);
+	}
+
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_TDIO, ASPEED_JTAG_SW);
+	aspeed_jtag->status = xfer->endstate;
+	return 0;
+}
+
+static int aspeed_jtag_status_get(struct jtag *jtag, u32 *status)
+{
+	struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
+
+	*status = aspeed_jtag->status;
+	return 0;
+}
+
+static irqreturn_t aspeed_jtag_interrupt(s32 this_irq, void *dev_id)
+{
+	struct aspeed_jtag *aspeed_jtag = dev_id;
+	irqreturn_t ret;
+	u32 status;
+
+	status = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_ISR);
+
+	if (status & ASPEED_JTAG_ISR_INT_MASK) {
+		aspeed_jtag_write(aspeed_jtag,
+				  (status & ASPEED_JTAG_ISR_INT_MASK)
+				  | (status & ASPEED_JTAG_ISR_INT_EN_MASK),
+				  ASPEED_JTAG_ISR);
+		aspeed_jtag->flag |= status & ASPEED_JTAG_ISR_INT_MASK;
+	}
+
+	if (aspeed_jtag->flag) {
+		wake_up_interruptible(&aspeed_jtag->jtag_wq);
+		ret = IRQ_HANDLED;
+	} else {
+		dev_err(aspeed_jtag->dev, "irq status:%x\n",
+			status);
+		ret = IRQ_NONE;
+	}
+	return ret;
+}
+
+static int aspeed_jtag_init(struct platform_device *pdev,
+			    struct aspeed_jtag *aspeed_jtag)
+{
+	struct resource *res;
+	int err;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	aspeed_jtag->reg_base = devm_ioremap_resource(aspeed_jtag->dev, res);
+	if (IS_ERR(aspeed_jtag->reg_base))
+		return -ENOMEM;
+
+	aspeed_jtag->pclk = devm_clk_get(aspeed_jtag->dev, NULL);
+	if (IS_ERR(aspeed_jtag->pclk)) {
+		dev_err(aspeed_jtag->dev, "devm_clk_get failed\n");
+		return PTR_ERR(aspeed_jtag->pclk);
+	}
+
+	aspeed_jtag->irq = platform_get_irq(pdev, 0);
+	if (aspeed_jtag->irq < 0) {
+		dev_err(aspeed_jtag->dev, "no irq specified\n");
+		return -ENOENT;
+	}
+
+	if (clk_prepare_enable(aspeed_jtag->pclk)) {
+		dev_err(aspeed_jtag->dev, "no irq specified\n");
+		return -ENOENT;
+	}
+
+	aspeed_jtag->rst = devm_reset_control_get_shared(&pdev->dev, NULL);
+	if (IS_ERR(aspeed_jtag->rst)) {
+		dev_err(aspeed_jtag->dev,
+			"missing or invalid reset controller device tree entry");
+		return PTR_ERR(aspeed_jtag->rst);
+	}
+	reset_control_deassert(aspeed_jtag->rst);
+
+	/* Enable clock */
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_CTL_ENG_EN |
+			  ASPEED_JTAG_CTL_ENG_OUT_EN, ASPEED_JTAG_CTRL);
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_TDIO, ASPEED_JTAG_SW);
+
+	err = devm_request_irq(aspeed_jtag->dev, aspeed_jtag->irq,
+			       aspeed_jtag_interrupt, 0,
+			       "aspeed-jtag", aspeed_jtag);
+	if (err) {
+		dev_err(aspeed_jtag->dev, "unable to get IRQ");
+		goto clk_unprep;
+	}
+
+	aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_ISR_INST_PAUSE |
+			  ASPEED_JTAG_ISR_INST_COMPLETE |
+			  ASPEED_JTAG_ISR_DATA_PAUSE |
+			  ASPEED_JTAG_ISR_DATA_COMPLETE |
+			  ASPEED_JTAG_ISR_INST_PAUSE_EN |
+			  ASPEED_JTAG_ISR_INST_COMPLETE_EN |
+			  ASPEED_JTAG_ISR_DATA_PAUSE_EN |
+			  ASPEED_JTAG_ISR_DATA_COMPLETE_EN,
+			  ASPEED_JTAG_ISR);
+
+	aspeed_jtag->flag = 0;
+	aspeed_jtag->mode = 0;
+	init_waitqueue_head(&aspeed_jtag->jtag_wq);
+	return 0;
+
+clk_unprep:
+	clk_disable_unprepare(aspeed_jtag->pclk);
+	return err;
+}
+
+static int aspeed_jtag_deinit(struct platform_device *pdev,
+			      struct aspeed_jtag *aspeed_jtag)
+{
+	aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_ISR);
+	/* Disable clock */
+	aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_CTRL);
+	reset_control_assert(aspeed_jtag->rst);
+	clk_disable_unprepare(aspeed_jtag->pclk);
+	return 0;
+}
+
+static const struct jtag_ops aspeed_jtag_ops = {
+	.freq_get = aspeed_jtag_freq_get,
+	.freq_set = aspeed_jtag_freq_set,
+	.status_get = aspeed_jtag_status_get,
+	.idle = aspeed_jtag_idle,
+	.xfer = aspeed_jtag_xfer,
+	.mode_set = aspeed_jtag_mode_set
+};
+
+static int aspeed_jtag_probe(struct platform_device *pdev)
+{
+	struct aspeed_jtag *aspeed_jtag;
+	struct jtag *jtag;
+	int err;
+
+	jtag = jtag_alloc(&pdev->dev, sizeof(*aspeed_jtag), &aspeed_jtag_ops);
+	if (!jtag)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, jtag);
+	aspeed_jtag = jtag_priv(jtag);
+	aspeed_jtag->dev = &pdev->dev;
+
+	/* Initialize device*/
+	err = aspeed_jtag_init(pdev, aspeed_jtag);
+	if (err)
+		goto err_jtag_init;
+
+	/* Initialize JTAG core structure*/
+	err = devm_jtag_register(aspeed_jtag->dev, jtag);
+	if (err)
+		goto err_jtag_register;
+
+	return 0;
+
+err_jtag_register:
+	aspeed_jtag_deinit(pdev, aspeed_jtag);
+err_jtag_init:
+	jtag_free(jtag);
+	return err;
+}
+
+static int aspeed_jtag_remove(struct platform_device *pdev)
+{
+	struct jtag *jtag = platform_get_drvdata(pdev);
+
+	aspeed_jtag_deinit(pdev, jtag_priv(jtag));
+	return 0;
+}
+
+static const struct of_device_id aspeed_jtag_of_match[] = {
+	{ .compatible = "aspeed,ast2400-jtag", },
+	{ .compatible = "aspeed,ast2500-jtag", },
+	{}
+};
+
+static struct platform_driver aspeed_jtag_driver = {
+	.probe = aspeed_jtag_probe,
+	.remove = aspeed_jtag_remove,
+	.driver = {
+		.name = ASPEED_JTAG_NAME,
+		.of_match_table = aspeed_jtag_of_match,
+	},
+};
+module_platform_driver(aspeed_jtag_driver);
+
+MODULE_AUTHOR("Oleksandr Shamray <oleksandrs@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("ASPEED JTAG driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.1

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