drivers: reset: stih415: add softreset controller

This patch adds softreset controller for STiH415 SOC, soft reset
controller is based on system configuration registers which are mapped
via regmap. This reset controller does not have any feedback or
acknowledgement. With this patch a new device "st,stih415-softreset" is
registered with system configuration registers based reset controller
that controls the softreset state of the hardware such as Ethernet, IRB.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/reset/sti/reset-stih415.c

@@ -31,12 +31,29 @@ static const char stih415_lpm[] = "st,stih415-lpm-syscfg";
 #define STIH415_PDN_REAR(_cntl, _stat) \
 	_SYSCFG_RST_CH(stih415_rear, SYSCFG_336, _cntl, SYSSTAT_384, _stat)
 
+#define STIH415_SRST_REAR(_reg, _bit) \
+	_SYSCFG_RST_CH_NO_ACK(stih415_rear, _reg, _bit)
+
+#define STIH415_SRST_SBC(_reg, _bit) \
+	_SYSCFG_RST_CH_NO_ACK(stih415_sbc, _reg, _bit)
+
+#define STIH415_SRST_FRONT(_reg, _bit) \
+	_SYSCFG_RST_CH_NO_ACK(stih415_front, _reg, _bit)
+
+#define STIH415_SRST_LPM(_reg, _bit) \
+	_SYSCFG_RST_CH_NO_ACK(stih415_lpm, _reg, _bit)
+
 #define SYSCFG_114	0x38 /* Powerdown request EMI/NAND/Keyscan */
 #define SYSSTAT_187	0x15c /* Powerdown status EMI/NAND/Keyscan */
 
 #define SYSCFG_336	0x90 /* Powerdown request USB/SATA/PCIe */
 #define SYSSTAT_384	0x150 /* Powerdown status USB/SATA/PCIe */
 
+#define SYSCFG_376	0x130 /* Reset generator 0 control 0 */
+#define SYSCFG_166	0x108 /* Softreset Ethernet 0 */
+#define SYSCFG_31	0x7c /* Softreset Ethernet 1 */
+#define LPM_SYSCFG_1	0x4 /* Softreset IRB */
+
 static const struct syscfg_reset_channel_data stih415_powerdowns[] = {
 	[STIH415_EMISS_POWERDOWN]	= STIH415_PDN_FRONT(0),
 	[STIH415_NAND_POWERDOWN]	= STIH415_PDN_FRONT(1),
@@ -49,15 +66,33 @@ static const struct syscfg_reset_channel_data stih415_powerdowns[] = {
 	[STIH415_PCIE_POWERDOWN]	= STIH415_PDN_REAR(5, 8),
 };
 
+static const struct syscfg_reset_channel_data stih415_softresets[] = {
+	[STIH415_ETH0_SOFTRESET] = STIH415_SRST_FRONT(SYSCFG_166, 0),
+	[STIH415_ETH1_SOFTRESET] = STIH415_SRST_SBC(SYSCFG_31, 0),
+	[STIH415_IRB_SOFTRESET]	 = STIH415_SRST_LPM(LPM_SYSCFG_1, 6),
+	[STIH415_USB0_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 9),
+	[STIH415_USB1_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 10),
+	[STIH415_USB2_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 11),
+};
+
 static struct syscfg_reset_controller_data stih415_powerdown_controller = {
 	.wait_for_ack = true,
 	.nr_channels = ARRAY_SIZE(stih415_powerdowns),
 	.channels = stih415_powerdowns,
 };
 
+static struct syscfg_reset_controller_data stih415_softreset_controller = {
+	.wait_for_ack = false,
+	.active_low = true,
+	.nr_channels = ARRAY_SIZE(stih415_softresets),
+	.channels = stih415_softresets,
+};
+
 static struct of_device_id stih415_reset_match[] = {
 	{ .compatible = "st,stih415-powerdown",
 	  .data = &stih415_powerdown_controller, },
+	{ .compatible = "st,stih415-softreset",
+	  .data = &stih415_softreset_controller, },
 	{},
 };