| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <device/mmio.h> |
| #include <delay.h> |
| #include <soc/addressmap.h> |
| #include <soc/clk_rst.h> |
| #include <soc/clock.h> |
| #include <soc/nvidia/tegra/i2c.h> |
| #include <soc/padconfig.h> |
| #include <soc/power.h> |
| |
| #define I2C6_PADCTL 0xC001 |
| #define DPAUX_HYBRID_PADCTL 0x545C0124 |
| #define DPAUX_HYBRID_SPARE 0x545C0134 |
| |
| static void enable_sor_periph_clocks(void) |
| { |
| clock_enable(CLK_L_HOST1X, 0, 0, 0, 0, CLK_X_DPAUX, 0); |
| |
| /* Give clocks time to stabilize. */ |
| udelay(IO_STABILIZATION_DELAY); |
| } |
| |
| static void disable_sor_periph_clocks(void) |
| { |
| clock_disable(CLK_L_HOST1X, 0, 0, 0, 0, CLK_X_DPAUX, 0); |
| |
| /* Give clocks time to stabilize. */ |
| udelay(IO_STABILIZATION_DELAY); |
| } |
| |
| static void unreset_sor_periphs(void) |
| { |
| clock_clr_reset(CLK_L_HOST1X, 0, 0, 0, 0, CLK_X_DPAUX, 0); |
| } |
| |
| void soc_configure_i2c6pad(void) |
| { |
| /* |
| * I2C6 on Tegra1xx requires some special init. |
| * The SOR block must be unpowergated, and a couple of |
| * display-based peripherals must be clocked and taken |
| * out of reset so that a DPAUX register can be |
| * configured to enable the I2C6 mux routing. |
| * Afterwards, we can disable clocks to the display blocks |
| * and put Host1X back in reset. DPAUX must remain out of |
| * reset and the SOR partition must remained unpowergated. |
| */ |
| soc_configure_host1x(); |
| |
| /* enable SOR_SAFE and DPAUX_1 clocks */ |
| clock_enable_y(CLK_Y_DPAUX1 | CLK_Y_SOR_SAFE); |
| |
| /* Now we can write the I2C6 mux in DPAUX */ |
| write32((void *)DPAUX_HYBRID_PADCTL, I2C6_PADCTL); |
| /* Finally, power up the pads */ |
| write32((void *)DPAUX_HYBRID_SPARE, 0); |
| |
| /* |
| * Delay before turning off Host1X/DPAUX clocks. |
| * This delay is needed to keep the sequence from |
| * hanging the system. |
| */ |
| udelay(CLOCK_PLL_STABLE_DELAY_US); |
| |
| /* Stop Host1X/DPAUX clocks and reset Host1X */ |
| disable_sor_periph_clocks(); |
| clock_set_reset_l(CLK_L_HOST1X); |
| } |
| |
| void soc_configure_host1x(void) |
| { |
| power_ungate_partition(POWER_PARTID_SOR); |
| |
| /* Host1X needs a valid clock source so DPAUX can be accessed. */ |
| clock_configure_source(host1x, PLLP, 204000); |
| |
| enable_sor_periph_clocks(); |
| remove_clamps(POWER_PARTID_SOR); |
| unreset_sor_periphs(); |
| } |