Cliff Huang | 7e653d8 | 2022-01-21 17:36:20 -0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | |
| 3 | #include <acpi/acpigen.h> |
| 4 | #include <acpi/acpi_device.h> |
| 5 | #include "chip.h" |
| 6 | #include "soc/intel/common/block/pcie/rtd3/chip.h" |
| 7 | |
| 8 | /* FCPO# to RESET# delay time during WWAN ON */ |
| 9 | #define FM350GL_TN2B 20 |
| 10 | /* RESET# to PERST# delay time during WWAN ON */ |
| 11 | #define FM350GL_TB2R 80 |
| 12 | /* The delay between de-assertion of PERST# to change of PDS state from 0 to 1 during WWAN ON */ |
| 13 | #define FM350GL_TR2P 0 |
| 14 | /* RESET# to FCPO# delay time during WWAN OFF */ |
| 15 | #define FM350GL_TB2F 10 |
| 16 | /* Time to allow the WWAN module to fully discharge any residual voltages before FCPO# could be |
| 17 | de-asserted again. */ |
| 18 | #define FM350GL_TFDI 500 |
| 19 | /* The delay between assertion and de-assertion RESET# during FLDR */ |
| 20 | #define FM350GL_TBTG 10 |
| 21 | /* The delay between de-assertion of RESET# and change of PDS state from 0 to 1 after FLDR */ |
| 22 | #define FM350GL_TBTP 170 |
| 23 | /* PERST# to RESET# delay time during WWAN OFF */ |
| 24 | #define FM350GL_TR2B 10 |
| 25 | /* 20s HW initialization needed after de-assertion of PERST# |
| 26 | However, it is not required and is not proper place to ensure HW initialization in ACPI. The |
| 27 | delay here is to ensure the following reset or RTD3 _OFF method won't be called immediately. |
| 28 | */ |
| 29 | #define FM350GL_TIME_HW_INIT 100 |
| 30 | |
| 31 | enum reset_type { |
| 32 | RESET_TYPE_WARM = 0, |
| 33 | RESET_TYPE_COLD = 1 |
| 34 | }; |
| 35 | |
| 36 | /* |
| 37 | * Returns the RTD3 PM methods requested and available to the device. |
| 38 | */ |
| 39 | static enum acpi_pcie_rp_pm_emit |
| 40 | wwan_fm350gl_get_rtd3_method_support(const struct drivers_wwan_fm_config *config) |
| 41 | { |
| 42 | const struct soc_intel_common_block_pcie_rtd3_config *rtd3_config; |
| 43 | |
| 44 | rtd3_config = config_of(config->rtd3dev); |
| 45 | |
| 46 | return rtd3_config->ext_pm_support; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * Generate first half reset flow (FHRF) method. |
| 51 | * Arg0 = RESET_TYPE_WARM: warm reset |
| 52 | * Arg0 = 1RESET_TYPE_COLD: cold reset |
| 53 | */ |
| 54 | static void wwan_fm350gl_acpi_method_fhrf(const struct device *parent_dev, |
| 55 | const struct drivers_wwan_fm_config *config) |
| 56 | { |
| 57 | acpigen_write_method_serialized("FHRF", 1); |
| 58 | { |
| 59 | /* LOCAL0 = PERST# */ |
| 60 | acpigen_get_tx_gpio(&config->perst_gpio); |
| 61 | acpigen_write_if_lequal_op_int(LOCAL0_OP, 0); |
| 62 | { |
| 63 | if (wwan_fm350gl_get_rtd3_method_support(config) | |
| 64 | ACPI_PCIE_RP_EMIT_L23) { |
| 65 | acpigen_emit_namestring(acpi_device_path_join(parent_dev, |
| 66 | "DL23")); |
| 67 | } |
| 68 | /* assert PERST# pin */ |
| 69 | acpigen_enable_tx_gpio(&config->perst_gpio); |
| 70 | } |
| 71 | acpigen_write_if_end(); /* If */ |
| 72 | acpigen_write_sleep(FM350GL_TR2B); |
| 73 | /* assert RESET# pin */ |
| 74 | acpigen_enable_tx_gpio(&config->reset_gpio); |
| 75 | /* warm reset */ |
| 76 | acpigen_write_if_lequal_op_int(ARG0_OP, RESET_TYPE_WARM); |
| 77 | { |
| 78 | acpigen_write_sleep(FM350GL_TBTG); |
| 79 | } |
| 80 | /* cold reset */ |
| 81 | acpigen_write_else(); |
| 82 | { |
| 83 | acpigen_write_if_lequal_op_int(ARG0_OP, RESET_TYPE_COLD); |
| 84 | { |
| 85 | /* disable source clock */ |
| 86 | if (wwan_fm350gl_get_rtd3_method_support(config) | |
| 87 | ACPI_PCIE_RP_EMIT_SRCK) { |
| 88 | acpigen_emit_namestring(acpi_device_path_join( |
| 89 | parent_dev, "SRCK")); |
| 90 | acpigen_emit_byte(ZERO_OP); |
| 91 | } |
| 92 | acpigen_write_sleep(FM350GL_TB2F); |
| 93 | /* assert FCPO# pin */ |
| 94 | acpigen_enable_tx_gpio(&config->fcpo_gpio); |
| 95 | acpigen_write_sleep(FM350GL_TFDI); |
| 96 | } |
| 97 | acpigen_write_if_end(); /* If */ |
| 98 | } |
| 99 | acpigen_pop_len(); /* Else */ |
| 100 | } |
| 101 | acpigen_write_method_end(); /* Method */ |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Generate second half reset flow (SHRF) method. |
| 106 | */ |
| 107 | static void wwan_fm350gl_acpi_method_shrf(const struct device *parent_dev, |
| 108 | const struct drivers_wwan_fm_config *config) |
| 109 | { |
| 110 | acpigen_write_method_serialized("SHRF", 0); |
| 111 | { |
| 112 | /* call rtd3 method to Disable ModPHY Power Gating. */ |
| 113 | if (wwan_fm350gl_get_rtd3_method_support(config) | |
| 114 | ACPI_PCIE_RP_EMIT_PSD0) { |
| 115 | acpigen_emit_namestring(acpi_device_path_join(parent_dev, |
| 116 | "PSD0")); |
| 117 | } |
| 118 | /* call rtd3 method to Enable SRC Clock. */ |
| 119 | if (wwan_fm350gl_get_rtd3_method_support(config) | |
| 120 | ACPI_PCIE_RP_EMIT_SRCK) { |
| 121 | acpigen_emit_namestring(acpi_device_path_join(parent_dev, |
| 122 | "SRCK")); |
| 123 | acpigen_emit_byte(ONE_OP); |
| 124 | } |
| 125 | /* De-assert FCPO# GPIO. */ |
| 126 | acpigen_disable_tx_gpio(&config->fcpo_gpio); |
| 127 | acpigen_write_sleep(FM350GL_TN2B); |
| 128 | /* De-assert RESET# GPIO. */ |
| 129 | acpigen_disable_tx_gpio(&config->reset_gpio); |
| 130 | acpigen_write_sleep(FM350GL_TB2R); |
| 131 | /* De-assert PERST# GPIO. */ |
| 132 | acpigen_disable_tx_gpio(&config->perst_gpio); |
| 133 | /* Call rtd3 method to trigger L2/L3 ready exit flow in root port */ |
| 134 | if (wwan_fm350gl_get_rtd3_method_support(config) | |
| 135 | ACPI_PCIE_RP_EMIT_L23) { |
| 136 | acpigen_emit_namestring(acpi_device_path_join(parent_dev, |
| 137 | "L23D")); |
| 138 | } |
| 139 | acpigen_write_sleep(FM350GL_TIME_HW_INIT); |
| 140 | } |
| 141 | acpigen_write_method_end(); /* Method */ |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Generate _RST method. This is to perform a soft reset. It is added under |
| 146 | * PXSX. This is called during device driver removal. |
| 147 | */ |
| 148 | static void wwan_fm350gl_acpi_method_rst(const struct device *parent_dev, |
| 149 | const struct drivers_wwan_fm_config *config) |
| 150 | { |
| 151 | acpigen_write_method_serialized("_RST", 0); |
| 152 | { |
| 153 | /* Perform 1st Half of FLDR Flow for soft reset: FHRF(0) */ |
| 154 | acpigen_emit_namestring("FHRF"); |
| 155 | acpigen_emit_byte(RESET_TYPE_WARM); |
| 156 | /* Perform 2nd Half of FLDR Flow: SHRF() */ |
| 157 | acpigen_emit_namestring("SHRF"); |
| 158 | /* Indicates that the following _Off will be skipped. */ |
| 159 | acpigen_emit_byte(INCREMENT_OP); |
| 160 | acpigen_emit_namestring(acpi_device_path_join(parent_dev, "RTD3.OFSK")); |
| 161 | } |
| 162 | acpigen_write_method_end(); /* Method */ |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * Generate _RST method. This is to perform a cold reset. This reset will be |
| 167 | * included under PXSX.MRST. This method is used during device firmware update. |
| 168 | */ |
| 169 | static void wwan_fm350gl_acpi_method_mrst_rst(const struct device *parent_dev, |
| 170 | const struct drivers_wwan_fm_config *config) |
| 171 | { |
| 172 | acpigen_write_method_serialized("_RST", 0); |
| 173 | { |
| 174 | /* Perform 1st Half of FLDR Flow for cold reset: FHRF (1) */ |
| 175 | acpigen_emit_namestring("FHRF"); |
| 176 | acpigen_emit_byte(RESET_TYPE_COLD); |
| 177 | /* Perform 2nd Half of FLDR Flow: SHRF () */ |
| 178 | acpigen_emit_namestring("SHRF"); |
| 179 | /* Indicate kernel ACPI PM to skip _off RTD3 after reset at the end of |
| 180 | driver removal */ |
| 181 | acpigen_emit_byte(INCREMENT_OP); |
| 182 | acpigen_emit_namestring(acpi_device_path_join(parent_dev, "RTD3.OFSK")); |
| 183 | } |
| 184 | acpigen_write_method_end(); /* Method */ |
| 185 | } |
| 186 | |
| 187 | static const char *wwan_fm350gl_acpi_name(const struct device *dev) |
| 188 | { |
| 189 | /* Attached device name must be "PXSX" for the Linux Kernel to recognize it. */ |
| 190 | return "PXSX"; |
| 191 | } |
| 192 | |
| 193 | static void wwan_fm350gl_acpi_fill_ssdt(const struct device *dev) |
| 194 | { |
| 195 | const struct drivers_wwan_fm_config *config = config_of(dev); |
| 196 | const struct device *parent = dev->bus->dev; |
| 197 | const char *scope = acpi_device_path(parent); |
| 198 | |
| 199 | if (!is_dev_enabled(parent)) { |
| 200 | printk(BIOS_ERR, "%s: root port not enabled\n", __func__); |
| 201 | return; |
| 202 | } |
| 203 | if (!scope) { |
| 204 | printk(BIOS_ERR, "%s: root port scope not found\n", __func__); |
| 205 | return; |
| 206 | } |
| 207 | if (!config->fcpo_gpio.pin_count && !config->reset_gpio.pin_count && |
| 208 | !config->perst_gpio.pin_count) { |
| 209 | printk(BIOS_ERR, "%s: FCPO, RESET, PERST GPIO required for %s.\n", |
| 210 | __func__, scope); |
| 211 | return; |
| 212 | } |
| 213 | printk(BIOS_INFO, "%s: Enable WWAN for %s (%s)\n", scope, dev_path(parent), |
| 214 | config->desc ?: dev->chip_ops->name); |
| 215 | acpigen_write_scope(scope); |
| 216 | { |
| 217 | acpigen_write_device(wwan_fm350gl_acpi_name(dev)); |
| 218 | { |
| 219 | acpigen_write_ADR(0); |
| 220 | if (config->name) |
| 221 | acpigen_write_name_string("_DDN", config->name); |
| 222 | if (config->desc) |
| 223 | acpigen_write_name_unicode("_STR", config->desc); |
| 224 | wwan_fm350gl_acpi_method_fhrf(parent, config); |
| 225 | wwan_fm350gl_acpi_method_shrf(parent, config); |
| 226 | wwan_fm350gl_acpi_method_rst(parent, config); |
| 227 | /* NOTE: the 5G driver will call MRST._RST to trigger a cold reset |
| 228 | * during firmware update. |
| 229 | */ |
| 230 | acpigen_write_device("MRST"); |
| 231 | { |
| 232 | acpigen_write_ADR(0); |
| 233 | wwan_fm350gl_acpi_method_mrst_rst(parent, config); |
| 234 | } |
| 235 | acpigen_write_device_end(); /* Device */ |
| 236 | } |
| 237 | acpigen_write_device_end(); /* Device */ |
| 238 | } |
| 239 | acpigen_write_scope_end(); /* Scope */ |
| 240 | } |
| 241 | |
| 242 | static struct device_operations wwan_fm350gl_ops = { |
| 243 | .read_resources = noop_read_resources, |
| 244 | .set_resources = noop_set_resources, |
| 245 | .acpi_fill_ssdt = wwan_fm350gl_acpi_fill_ssdt, |
| 246 | .acpi_name = wwan_fm350gl_acpi_name, |
| 247 | }; |
| 248 | |
| 249 | static void wwan_fm350gl_acpi_enable(struct device *dev) |
| 250 | { |
| 251 | dev->ops = &wwan_fm350gl_ops; |
| 252 | } |
| 253 | |
| 254 | struct chip_operations drivers_wwan_fm_ops = { |
| 255 | CHIP_NAME("Fibocom FM-350-GL") |
| 256 | .enable_dev = wwan_fm350gl_acpi_enable |
| 257 | }; |