tegra124: i2c: Reset the controller when there's an error.

This is the only way to clear the error bits in the controller. Without
clearing them, every future transaction will look like it failed.

BUG=chrome-os-partner:27220
TEST=Built and booted on nyan with the TPM frequency turned up to 400 KHz.
BRANCH=None

Original-Change-Id: Ib654e60ec3039ad9f5f96aa7288d3d877e5c843a
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/191811
Original-Reviewed-by: Tom Warren <twarren@nvidia.com>
Original-Reviewed-by: Gabe Black <gabeblack@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 7b19a095652f1561590dcca922b9f8c308d7de9d)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I301b6694cc521601b618973de891e4ed44c6a97d
Reviewed-on: http://review.coreboot.org/7460
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

src/soc/nvidia/tegra/i2c.c

@@ -26,10 +26,13 @@
 
 #include "i2c.h"
 
-static int tegra_i2c_send_recv(struct tegra_i2c_regs *regs, int read,
+static int tegra_i2c_send_recv(int bus, int read,
 			       uint32_t *headers, int header_words,
 			       uint8_t *data, int data_len)
 {
+	struct tegra_i2c_bus_info *info = &tegra_i2c_info[bus];
+	struct tegra_i2c_regs * const regs = info->base;
+
 	while (data_len) {
 		uint32_t status = read32(&regs->fifo_status);
 		int tx_empty = status & I2C_FIFO_STATUS_TX_FIFO_EMPTY_CNT_MASK;
@@ -75,16 +78,19 @@ static int tegra_i2c_send_recv(struct tegra_i2c_regs *regs, int read,
 			printk(BIOS_ERR,
 			       "%s: The address was not acknowledged.\n",
 			       __func__);
+			info->reset_func(info->reset_bit);
 			return -1;
 		} else if (transfer_status & I2C_PKT_STATUS_NOACK_DATA) {
 			printk(BIOS_ERR,
 			       "%s: The data was not acknowledged.\n",
 			       __func__);
+			info->reset_func(info->reset_bit);
 			return -1;
 		} else if (transfer_status & I2C_PKT_STATUS_ARB_LOST) {
 			printk(BIOS_ERR,
 			       "%s: Lost arbitration.\n",
 			       __func__);
+			info->reset_func(info->reset_bit);
 			return -1;
 		}
 	}
@@ -95,7 +101,6 @@ static int tegra_i2c_send_recv(struct tegra_i2c_regs *regs, int read,
 static int tegra_i2c_request(int bus, unsigned chip, int cont, int restart,
 			     int read, void *data, int data_len)
 {
-	struct tegra_i2c_regs * const regs = tegra_i2c_bases[bus];
 	uint32_t headers[3];
 
 	if (restart && cont) {
@@ -121,7 +126,7 @@ static int tegra_i2c_request(int bus, unsigned chip, int cont, int restart,
 	if (cont)
 		headers[2] |= IOHEADER_I2C_REQ_CONTINUE_XFER;
 
-	return tegra_i2c_send_recv(regs, read, headers, ARRAY_SIZE(headers),
+	return tegra_i2c_send_recv(bus, read, headers, ARRAY_SIZE(headers),
 				   data, data_len);
 }
 
@@ -166,7 +171,7 @@ int i2c_write(unsigned bus, unsigned chip, unsigned addr,
 
 void i2c_init(unsigned bus)
 {
-	struct tegra_i2c_regs * const regs = tegra_i2c_bases[bus];
+	struct tegra_i2c_regs * const regs = tegra_i2c_info[bus].base;
 
 	write32(I2C_CNFG_PACKET_MODE_EN, &regs->cnfg);
 }

src/soc/nvidia/tegra/i2c.h

@@ -110,7 +110,13 @@ enum {
 		0xf << I2C_FIFO_STATUS_RX_FIFO_FULL_CNT_SHIFT
 };
 
-extern void * const tegra_i2c_bases[];
+struct tegra_i2c_bus_info {
+	void *base;
+	uint32_t reset_bit;
+	void (*reset_func)(u32 bit);
+};
+
+extern struct tegra_i2c_bus_info tegra_i2c_info[];
 
 struct tegra_i2c_regs {
 	uint32_t cnfg;

src/soc/nvidia/tegra124/i2c.c

@@ -18,10 +18,38 @@
  */
 
 #include <soc/addressmap.h>
+#include <soc/clock.h>
 #include <soc/nvidia/tegra/i2c.h>
 
-void * const tegra_i2c_bases[TEGRA_I2C_BASE_COUNT] = {
+struct tegra_i2c_bus_info tegra_i2c_info[] = {
-	(void *)TEGRA_I2C_BASE,  (void *)TEGRA_I2C2_BASE,
+	{
-	(void *)TEGRA_I2C3_BASE, (void *)TEGRA_I2C4_BASE,
+		.base = (void *)TEGRA_I2C_BASE,
-	(void *)TEGRA_I2C5_BASE, (void *)TEGRA_I2C6_BASE
+		.reset_bit = CLK_L_I2C1,
+		.reset_func = &clock_reset_l
+	},
+	{
+		.base = (void *)TEGRA_I2C2_BASE,
+		.reset_bit = CLK_H_I2C2,
+		.reset_func = &clock_reset_h
+	},
+	{
+		.base = (void *)TEGRA_I2C3_BASE,
+		.reset_bit = CLK_U_I2C3,
+		.reset_func = &clock_reset_u
+	},
+	{
+		.base = (void *)TEGRA_I2C4_BASE,
+		.reset_bit = CLK_V_I2C4,
+		.reset_func = &clock_reset_v
+	},
+	{
+		.base = (void *)TEGRA_I2C5_BASE,
+		.reset_bit = CLK_H_I2C5,
+		.reset_func = &clock_reset_h
+	},
+	{
+		.base = (void *)TEGRA_I2C6_BASE,
+		.reset_bit = CLK_X_I2C6,
+		.reset_func = &clock_reset_x
+	}
 };