src/mainboard/google/brya/variants/agah/variant.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpi.h>
   4 #include <acpi/acpigen.h>
   5 #include <baseboard/variants.h>
   6 #include <boardid.h>
   7 #include <delay.h>
   8 #include <device/pci.h>
   9 #include <gpio.h>
  10 #include <timer.h>
  11 #include <types.h>
  12
  13 #define GPU_1V8_PWR_EN          GPP_E18
  14 #define GPU_1V8_PG              GPP_E20
  15 #define NV33_PWR_EN             GPP_A21
  16 #define NV33_PG                 GPP_A22
  17 #define NVVDD_PWR_EN            GPP_E0
  18 #define NVVDD_PG                GPP_E3
  19 #define PEXVDD_PWR_EN           GPP_F12
  20 #define PEXVDD_PG               GPP_E17
  21 #define FBVDD_PWR_EN            GPP_A19
  22 #define FBVDD_PG                GPP_E4
  23 #define GPU_PERST_L             GPP_B3
  24 #define GPU_ALLRAILS_PG         GPP_E5
  25
  26 #define DEFAULT_PG_TIMEOUT_US   20000
  27
  28 #define VGAR_BYTE_OFFSET        5
  29
  30 /* Maximum size of PCI config space to save. */
  31 #define GPU_CONFIG_SAVE_SPACE_BYTES     0x100
  32
  33 static bool gpu_powered_on;
  34
  35 struct power_rail_sequence {
  36         const char *name;
  37
  38         /* This is the GPIO (output) connected to the VR's enable pin. */
  39         gpio_t pwr_en_gpio;
  40         bool pwr_en_active_low;
  41
  42         /* This is the GPIO (input) connected to the VR's power-good pin. */
  43         gpio_t pg_gpio;
  44
  45         /* Delay after sequencing this rail. */
  46         unsigned int delay_ms;
  47 };
  48
  49 /* In GCOFF exit order (i.e., power-on order) */
  50 static struct power_rail_sequence gpu_on_seq[] = {
  51         { "GPU 1.8V",           GPU_1V8_PWR_EN, false, GPU_1V8_PG, },
  52         { "NV3_3",              NV33_PWR_EN,    false, NV33_PG, },
  53         { "NVVDD+MSVDD",        NVVDD_PWR_EN,   false, NVVDD_PG, },
  54         { "PEXVDD",             PEXVDD_PWR_EN,  false, PEXVDD_PG, },
  55         { "FBVDD",              FBVDD_PWR_EN,   true,  FBVDD_PG, },
  56 };
  57
  58 /* In GCOFF entry order (i.e., power-off order) */
  59 static struct power_rail_sequence gpu_off_seq[] = {
  60         { "FBVDD",              FBVDD_PWR_EN,   true,  FBVDD_PG,        0,},
  61         { "PEXVDD",             PEXVDD_PWR_EN,  false, PEXVDD_PG,       10,},
  62         { "NVVDD+MSVDD",        NVVDD_PWR_EN,   false, NVVDD_PG,        2,},
  63         { "NV3_3",              NV33_PWR_EN,    false, NV33_PG,         4,},
  64         { "GPU 1.8V",           GPU_1V8_PWR_EN, false, GPU_1V8_PG,      0,},
  65 };
  66
  67 enum rail_state {
  68         RAIL_OFF = 0,
  69         RAIL_ON = 1,
  70 };
  71
  72 /* Assert the VR's enable pin, and wait until the VR's power-good is asserted. */
  73 static bool sequence_rail(const struct power_rail_sequence *seq, enum rail_state state)
  74 {
  75         enum rail_state pwr_en_state = state;
  76         bool result;
  77
  78         if (seq->pwr_en_active_low)
  79                 pwr_en_state = !pwr_en_state;
  80
  81         gpio_output(seq->pwr_en_gpio, pwr_en_state);
  82         result = wait_us(DEFAULT_PG_TIMEOUT_US, gpio_get(seq->pg_gpio) == state) >= 0;
  83         if (seq->delay_ms)
  84                 mdelay(seq->delay_ms);
  85
  86         return result;
  87 }
  88
  89 static void dgpu_power_sequence_off(void)
  90 {
  91         /* Assert reset and clear power-good */
  92         gpio_output(GPU_PERST_L, 0);
  93
  94         /* Inform the GPU that the power is no longer good. */
  95         gpio_output(GPU_ALLRAILS_PG, 0);
  96
  97         for (size_t i = 0; i < ARRAY_SIZE(gpu_off_seq); i++) {
  98                 if (!sequence_rail(&gpu_off_seq[i], RAIL_OFF)) {
  99                         printk(BIOS_ERR, "Failed to disable %s rail, continuing!\n",
 100                                gpu_off_seq[i].name);
 101                 }
 102         }
 103 }
 104
 105 static void dgpu_power_sequence_on(void)
 106 {
 107         /* Assert PERST# */
 108         gpio_output(GPU_PERST_L, 0);
 109
 110         for (size_t i = 0; i < ARRAY_SIZE(gpu_on_seq); i++) {
 111                 if (!sequence_rail(&gpu_on_seq[i], RAIL_ON)) {
 112                         printk(BIOS_ERR, "Failed to enable %s rail, sequencing back down!\n",
 113                                gpu_on_seq[i].name);
 114
 115                         /* If an error occurred, then perform the power-off sequence and
 116                            return early to avoid setting GPU_ALLRAILS_PG and PERST_L. */
 117                         dgpu_power_sequence_off();
 118                         return;
 119                }
 120         }
 121
 122         /* Set power-good and release PERST# */
 123         gpio_output(GPU_ALLRAILS_PG, 1);
 124         mdelay(1);
 125         gpio_output(GPU_PERST_L, 1);
 126
 127         printk(BIOS_INFO, "Sequenced GPU successfully\n");
 128         mdelay(1);
 129
 130         gpu_powered_on = true;
 131 }
 132
 133 void variant_init(void)
 134 {
 135         if (acpi_is_wakeup_s3())
 136                 return;
 137
 138         /* For board revs 3 and later, the power good pin for the
 139            NVVDD VR moved from GPP_E16 to GPP_E3, and the PEX enable
 140            pin moved from GPP_E10 to GPP_F12, so patch up the table
 141            for old board revs. */
 142         if (board_id() < 3) {
 143                 const struct pad_config board_rev_2_gpios[] = {
 144                         PAD_NC(GPP_E3, NONE),
 145                         PAD_CFG_GPO_LOCK(GPP_E10, 0, LOCK_CONFIG),
 146                         PAD_CFG_GPI(GPP_E16, NONE, PLTRST),
 147                         PAD_NC(GPP_F12, NONE),
 148                 };
 149                 gpio_configure_pads(board_rev_2_gpios, ARRAY_SIZE(board_rev_2_gpios));
 150
 151                 gpu_on_seq[2].pg_gpio = GPP_E16;
 152                 gpu_off_seq[2].pg_gpio = GPP_E16;
 153
 154                 gpu_on_seq[3].pwr_en_gpio = GPP_E10;
 155                 gpu_off_seq[3].pwr_en_gpio = GPP_E10;
 156         } else {
 157                 const struct pad_config board_rev_3_gpios[] = {
 158                         PAD_CFG_GPO(GPP_E3, 0, PLTRST),
 159                         PAD_NC(GPP_E10, NONE),
 160                         PAD_NC(GPP_E16, NONE),
 161                         PAD_CFG_GPO(GPP_F12, 0, PLTRST),
 162                 };
 163                 gpio_configure_pads(board_rev_3_gpios, ARRAY_SIZE(board_rev_3_gpios));
 164         }
 165
 166         dgpu_power_sequence_on();
 167 }
 168
 169 /*
 170  * For board revs 3 and later, two pins moved:
 171  * - The PG pin for the NVVDD VR moved from GPP_E16 to GPP_E3.
 172  * - The enable pin for the PEXVDD VR moved from GPP_E10 to GPP_F12
 173  *
 174  * To accommodate this, the DSDT contains two Names that this code
 175  * will write the correct GPIO # to depending on the board rev, and
 176  * we'll use that instead.
 177  */
 178 void variant_fill_ssdt(const struct device *dev)
 179 {
 180         const int nvvdd_pg_gpio = board_id() < 3 ? GPP_E16 : GPP_E3;
 181         const int pex_en_gpio = board_id() < 3 ? GPP_E10 : GPP_F12;
 182         acpigen_write_scope("\\_SB.PCI0.PEG0.PEGP");
 183         acpigen_write_method("_INI", 0);
 184         acpigen_write_store_int_to_namestr(nvvdd_pg_gpio, "NVPG");
 185         acpigen_write_store_int_to_namestr(pex_en_gpio, "PXEN");
 186         acpigen_write_method_end();
 187         acpigen_write_scope_end();
 188 }
 189
 190 void variant_finalize(void)
 191 {
 192         /*
 193          * Currently the `pch_pirq_init()` function in lpc_lib.c will program
 194          * PIRQ IRQs for all PCI devices discovered during enumeration. This may
 195          * not be correct for all devices, and causes strange behavior with the
 196          * Nvidia dGPU; it will start out with IRQ 11 and then after a
 197          * suspend/resume cycle, it will get programmed back to 16, so the Linux
 198          * kernel must be doing some IRQ sanitization at some point.  To fix
 199          * this anomaly, explicitly program the IRQ to 16 (which we know is what
 200          * IRQ it will eventually take).
 201         */
 202         const struct device *dgpu = DEV_PTR(dgpu);
 203         pci_write_config8(dgpu, PCI_INTERRUPT_LINE, 16);
 204 }