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drm/ast: Move I2C code into separate source file
Move I2C code into its own source file. Makes the mode-setting code a little less convoluted. v3: * fix SPDX tag to say 'SPDX-License-Identifier' Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20211206091125.29501-4-tzimmermann@suse.de
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Thomas Zimmermann
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Dec 16, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| /* | ||
| * Permission is hereby granted, free of charge, to any person obtaining a | ||
| * copy of this software and associated documentation files (the | ||
| * "Software"), to deal in the Software without restriction, including | ||
| * without limitation the rights to use, copy, modify, merge, publish, | ||
| * distribute, sub license, and/or sell copies of the Software, and to | ||
| * permit persons to whom the Software is furnished to do so, subject to | ||
| * the following conditions: | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | ||
| * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | ||
| * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
| * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | ||
| * USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| * | ||
| * The above copyright notice and this permission notice (including the | ||
| * next paragraph) shall be included in all copies or substantial portions | ||
| * of the Software. | ||
| */ | ||
|
|
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| #include <drm/drm_managed.h> | ||
| #include <drm/drm_print.h> | ||
|
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| #include "ast_drv.h" | ||
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| static void ast_i2c_setsda(void *i2c_priv, int data) | ||
| { | ||
| struct ast_i2c_chan *i2c = i2c_priv; | ||
| struct ast_private *ast = to_ast_private(i2c->dev); | ||
| int i; | ||
| u8 ujcrb7, jtemp; | ||
|
|
||
| for (i = 0; i < 0x10000; i++) { | ||
| ujcrb7 = ((data & 0x01) ? 0 : 1) << 2; | ||
| ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf1, ujcrb7); | ||
| jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x04); | ||
| if (ujcrb7 == jtemp) | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| static void ast_i2c_setscl(void *i2c_priv, int clock) | ||
| { | ||
| struct ast_i2c_chan *i2c = i2c_priv; | ||
| struct ast_private *ast = to_ast_private(i2c->dev); | ||
| int i; | ||
| u8 ujcrb7, jtemp; | ||
|
|
||
| for (i = 0; i < 0x10000; i++) { | ||
| ujcrb7 = ((clock & 0x01) ? 0 : 1); | ||
| ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf4, ujcrb7); | ||
| jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x01); | ||
| if (ujcrb7 == jtemp) | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| static int ast_i2c_getsda(void *i2c_priv) | ||
| { | ||
| struct ast_i2c_chan *i2c = i2c_priv; | ||
| struct ast_private *ast = to_ast_private(i2c->dev); | ||
| uint32_t val, val2, count, pass; | ||
|
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| count = 0; | ||
| pass = 0; | ||
| val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01; | ||
| do { | ||
| val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01; | ||
| if (val == val2) { | ||
| pass++; | ||
| } else { | ||
| pass = 0; | ||
| val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01; | ||
| } | ||
| } while ((pass < 5) && (count++ < 0x10000)); | ||
|
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| return val & 1 ? 1 : 0; | ||
| } | ||
|
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| static int ast_i2c_getscl(void *i2c_priv) | ||
| { | ||
| struct ast_i2c_chan *i2c = i2c_priv; | ||
| struct ast_private *ast = to_ast_private(i2c->dev); | ||
| uint32_t val, val2, count, pass; | ||
|
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| count = 0; | ||
| pass = 0; | ||
| val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01; | ||
| do { | ||
| val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01; | ||
| if (val == val2) { | ||
| pass++; | ||
| } else { | ||
| pass = 0; | ||
| val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01; | ||
| } | ||
| } while ((pass < 5) && (count++ < 0x10000)); | ||
|
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| return val & 1 ? 1 : 0; | ||
| } | ||
|
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| static void ast_i2c_release(struct drm_device *dev, void *res) | ||
| { | ||
| struct ast_i2c_chan *i2c = res; | ||
|
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| i2c_del_adapter(&i2c->adapter); | ||
| kfree(i2c); | ||
| } | ||
|
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| struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev) | ||
| { | ||
| struct ast_i2c_chan *i2c; | ||
| int ret; | ||
|
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| i2c = kzalloc(sizeof(struct ast_i2c_chan), GFP_KERNEL); | ||
| if (!i2c) | ||
| return NULL; | ||
|
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| i2c->adapter.owner = THIS_MODULE; | ||
| i2c->adapter.class = I2C_CLASS_DDC; | ||
| i2c->adapter.dev.parent = dev->dev; | ||
| i2c->dev = dev; | ||
| i2c_set_adapdata(&i2c->adapter, i2c); | ||
| snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), | ||
| "AST i2c bit bus"); | ||
| i2c->adapter.algo_data = &i2c->bit; | ||
|
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| i2c->bit.udelay = 20; | ||
| i2c->bit.timeout = 2; | ||
| i2c->bit.data = i2c; | ||
| i2c->bit.setsda = ast_i2c_setsda; | ||
| i2c->bit.setscl = ast_i2c_setscl; | ||
| i2c->bit.getsda = ast_i2c_getsda; | ||
| i2c->bit.getscl = ast_i2c_getscl; | ||
| ret = i2c_bit_add_bus(&i2c->adapter); | ||
| if (ret) { | ||
| drm_err(dev, "Failed to register bit i2c\n"); | ||
| goto out_kfree; | ||
| } | ||
|
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| ret = drmm_add_action_or_reset(dev, ast_i2c_release, i2c); | ||
| if (ret) | ||
| return NULL; | ||
| return i2c; | ||
|
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||
| out_kfree: | ||
| kfree(i2c); | ||
| return NULL; | ||
| } |
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