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authorsatya priya <skakit@codeaurora.org>2019-09-19 16:45:18 +0530
committerJulius Werner <jwerner@chromium.org>2020-04-21 21:54:48 +0000
commit52353d09fc981c48b58ebf8bf44f18ad12e119d2 (patch)
treebe52ac51d98777660af17ee5136803e51cb128b2 /src/soc/qualcomm
parent47a0832f821ab0e005f3552d0a6a26624c78a0c0 (diff)
downloadcoreboot-52353d09fc981c48b58ebf8bf44f18ad12e119d2.tar.xz
sc7180: Add I2C driver
Add I2C functionality in coreboot. Change-Id: I61221ffff8afe5c7ede5abb9e194e242ab0274d8 Signed-off-by: Roja Rani Yarubandi <rojay@codeaurora.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/36830 Reviewed-by: Julius Werner <jwerner@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/qualcomm')
-rw-r--r--src/soc/qualcomm/sc7180/Makefile.inc4
-rw-r--r--src/soc/qualcomm/sc7180/include/soc/qupv3_i2c.h23
-rw-r--r--src/soc/qualcomm/sc7180/qupv3_i2c.c165
3 files changed, 192 insertions, 0 deletions
diff --git a/src/soc/qualcomm/sc7180/Makefile.inc b/src/soc/qualcomm/sc7180/Makefile.inc
index 4a931f4b9c..4961d244d0 100644
--- a/src/soc/qualcomm/sc7180/Makefile.inc
+++ b/src/soc/qualcomm/sc7180/Makefile.inc
@@ -8,6 +8,7 @@ bootblock-y += timer.c
bootblock-y += spi.c
bootblock-y += qupv3_spi.c
bootblock-y += gpio.c
+bootblock-y += qupv3_i2c.c
bootblock-$(CONFIG_DRIVERS_UART) += uart_bitbang.c
bootblock-y += clock.c
bootblock-$(CONFIG_SC7180_QSPI) += qspi.c
@@ -19,6 +20,7 @@ verstage-y += timer.c
verstage-y += spi.c
verstage-y += qupv3_spi.c
verstage-y += gpio.c
+verstage-y += qupv3_i2c.c
verstage-y += clock.c
verstage-$(CONFIG_SC7180_QSPI) += qspi.c
verstage-y += qcom_qup_se.c
@@ -36,6 +38,7 @@ romstage-y += usb.c
romstage-y += spi.c
romstage-y += qupv3_spi.c
romstage-y += gpio.c
+romstage-y += qupv3_i2c.c
romstage-y += clock.c
romstage-$(CONFIG_SC7180_QSPI) += qspi.c
romstage-y += qcom_qup_se.c
@@ -48,6 +51,7 @@ ramstage-y += timer.c
ramstage-y += spi.c
ramstage-y += qupv3_spi.c
ramstage-y += gpio.c
+ramstage-y += qupv3_i2c.c
ramstage-y += clock.c
ramstage-$(CONFIG_SC7180_QSPI) += qspi.c
ramstage-y += aop_load_reset.c
diff --git a/src/soc/qualcomm/sc7180/include/soc/qupv3_i2c.h b/src/soc/qualcomm/sc7180/include/soc/qupv3_i2c.h
new file mode 100644
index 0000000000..e69f461ff9
--- /dev/null
+++ b/src/soc/qualcomm/sc7180/include/soc/qupv3_i2c.h
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the depthcharge project.
+ *
+ * Copyright (C) 2018-2019, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __I2C_QCOM_HEADER___
+#define __I2C_QCOM_HEADER___
+
+#include <device/i2c.h>
+
+void i2c_init(unsigned int bus, enum i2c_speed speed);
+
+#endif /* __I2C_QCOM_HEADER */
diff --git a/src/soc/qualcomm/sc7180/qupv3_i2c.c b/src/soc/qualcomm/sc7180/qupv3_i2c.c
new file mode 100644
index 0000000000..b8938e2315
--- /dev/null
+++ b/src/soc/qualcomm/sc7180/qupv3_i2c.c
@@ -0,0 +1,165 @@
+/*
+ * This file is part of the depthcharge project.
+ *
+ * Copyright (C) 2018-2020, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <assert.h>
+#include <device/i2c_simple.h>
+#include <gpio.h>
+#include <inttypes.h>
+#include <lib.h>
+#include <soc/clock.h>
+#include <soc/qcom_qup_se.h>
+#include <soc/qupv3_config.h>
+#include <soc/qupv3_i2c.h>
+#include <stdint.h>
+#include <string.h>
+
+static void i2c_clk_configure(unsigned int bus, enum i2c_speed speed)
+{
+ int clk_div = 0, t_high = 0, t_low = 0, t_cycle = 0;
+ struct qup_regs *regs = qup[bus].regs;
+
+ switch (speed) {
+ case I2C_SPEED_STANDARD:
+ clk_div = 7;
+ t_high = 10;
+ t_low = 11;
+ t_cycle = 26;
+ break;
+ case I2C_SPEED_FAST:
+ clk_div = 2;
+ t_high = 5;
+ t_low = 12;
+ t_cycle = 24;
+ break;
+ case I2C_SPEED_FAST_PLUS:
+ clk_div = 1;
+ t_high = 3;
+ t_low = 9;
+ t_cycle = 18;
+ break;
+ default:
+ die("Unsupported I2C speed");
+ }
+
+ write32(&regs->geni_ser_m_clk_cfg, (clk_div << 4) | 1);
+ /* Serial clock frequency is 19.2 MHz */
+ write32(&regs->i2c_scl_counters, ((t_high << 20) | (t_low << 10)
+ | t_cycle));
+}
+
+void i2c_init(unsigned int bus, enum i2c_speed speed)
+{
+ uint32_t proto;
+ struct qup_regs *regs = qup[bus].regs;
+
+ qupv3_se_fw_load_and_init(bus, SE_PROTOCOL_I2C, MIXED);
+ clock_enable_qup(bus);
+ i2c_clk_configure(bus, speed);
+
+ proto = ((read32(&regs->geni_fw_revision_ro) &
+ GENI_FW_REVISION_RO_PROTOCOL_MASK) >>
+ GENI_FW_REVISION_RO_PROTOCOL_SHIFT);
+
+ assert(proto == 3);
+
+ /* Serial engine IO initialization */
+ write32(&regs->geni_cgc_ctrl, DEFAULT_CGC_EN);
+ write32(&regs->dma_general_cfg,
+ (AHB_SEC_SLV_CLK_CGC_ON | DMA_AHB_SLV_CFG_ON
+ | DMA_TX_CLK_CGC_ON | DMA_RX_CLK_CGC_ON));
+ write32(&regs->geni_output_ctrl,
+ DEFAULT_IO_OUTPUT_CTRL_MSK);
+ write32(&regs->geni_force_default_reg, FORCE_DEFAULT);
+
+ /* Serial engine IO set mode */
+ write32(&regs->se_irq_en, (GENI_M_IRQ_EN |
+ GENI_S_IRQ_EN | DMA_TX_IRQ_EN | DMA_RX_IRQ_EN));
+ write32(&regs->se_gsi_event_en, 0);
+
+ /* Set RX and RFR watermark */
+ write32(&regs->geni_rx_watermark_reg, 0);
+ write32(&regs->geni_rx_rfr_watermark_reg, FIFO_DEPTH - 2);
+
+ /* FIFO PACKING CONFIGURATION */
+ write32(&regs->geni_tx_packing_cfg0, PACK_VECTOR0
+ | (PACK_VECTOR1 << 10));
+ write32(&regs->geni_tx_packing_cfg1, PACK_VECTOR2
+ | (PACK_VECTOR3 << 10));
+ write32(&regs->geni_rx_packing_cfg0, PACK_VECTOR0
+ | (PACK_VECTOR1 << 10));
+ write32(&regs->geni_rx_packing_cfg1, PACK_VECTOR2
+ | (PACK_VECTOR3 << 10));
+ write32(&regs->geni_byte_granularity, (log2(BITS_PER_WORD) - 3));
+
+ /* GPIO Configuration */
+ gpio_configure(qup[bus].pin[0], qup[bus].func[0], GPIO_PULL_UP,
+ GPIO_2MA, GPIO_OUTPUT_ENABLE);
+ gpio_configure(qup[bus].pin[1], qup[bus].func[1], GPIO_PULL_UP,
+ GPIO_2MA, GPIO_OUTPUT_ENABLE);
+
+ /* Select and setup FIFO mode */
+ write32(&regs->geni_m_irq_clear, 0xFFFFFFFF);
+ write32(&regs->geni_s_irq_clear, 0xFFFFFFFF);
+ write32(&regs->dma_tx_irq_clr, 0xFFFFFFFF);
+ write32(&regs->dma_rx_irq_clr, 0xFFFFFFFF);
+ write32(&regs->geni_m_irq_enable, (M_COMMON_GENI_M_IRQ_EN |
+ M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN |
+ M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN));
+ write32(&regs->geni_s_irq_enable, (S_COMMON_GENI_S_IRQ_EN
+ | S_CMD_DONE_EN));
+ clrbits32(&regs->geni_dma_mode_en, GENI_DMA_MODE_EN);
+}
+
+static int i2c_do_xfer(unsigned int bus, struct i2c_msg segment,
+ unsigned int prams)
+{
+ unsigned int cmd = (segment.flags & I2C_M_RD) ? 2 : 1;
+ unsigned int master_cmd_reg_val = (cmd << M_OPCODE_SHFT);
+ struct qup_regs *regs = qup[bus].regs;
+ void *dout = NULL, *din = NULL;
+
+ if (!(segment.flags & I2C_M_RD)) {
+ write32(&regs->i2c_tx_trans_len, segment.len);
+ write32(&regs->geni_tx_watermark_reg, TX_WATERMARK);
+ dout = segment.buf;
+ } else {
+ write32(&regs->i2c_rx_trans_len, segment.len);
+ din = segment.buf;
+ }
+
+ master_cmd_reg_val |= (prams & M_PARAMS_MSK);
+ write32(&regs->geni_m_cmd0, master_cmd_reg_val);
+
+ return qup_handle_transfer(bus, dout, din, segment.len);
+}
+
+int platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments,
+ int seg_count)
+{
+ struct i2c_msg *seg = segments;
+ int ret = 0;
+
+ while (!ret && seg_count--) {
+ /* Stretch means end with repeated start, not stop */
+ u32 stretch = (seg_count ? 1 : 0);
+ u32 m_param = 0;
+
+ m_param |= (stretch << 2);
+ m_param |= ((seg->slave & 0x7F) << 9);
+ ret = i2c_do_xfer(bus, *seg, m_param);
+ seg++;
+ }
+ return ret;
+}