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249 lines
6.0 KiB
249 lines
6.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2014, The Linux foundation. All rights reserved. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/syscon.h> |
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#include <dt-bindings/soc/qcom,gsbi.h> |
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#define GSBI_CTRL_REG 0x0000 |
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#define GSBI_PROTOCOL_SHIFT 4 |
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#define MAX_GSBI 12 |
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#define TCSR_ADM_CRCI_BASE 0x70 |
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struct crci_config { |
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u32 num_rows; |
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const u32 (*array)[MAX_GSBI]; |
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}; |
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static const u32 crci_ipq8064[][MAX_GSBI] = { |
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{ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000c00, 0x003000, 0x00c000, |
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0x030000, 0x0c0000, 0x300000, 0xc00000 |
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}, |
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{ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000c00, 0x003000, 0x00c000, |
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0x030000, 0x0c0000, 0x300000, 0xc00000 |
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}, |
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}; |
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static const struct crci_config config_ipq8064 = { |
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.num_rows = ARRAY_SIZE(crci_ipq8064), |
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.array = crci_ipq8064, |
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}; |
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static const unsigned int crci_apq8064[][MAX_GSBI] = { |
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{ |
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0x001800, 0x006000, 0x000030, 0x0000c0, |
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0x000300, 0x000400, 0x000000, 0x000000, |
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0x000000, 0x000000, 0x000000, 0x000000 |
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}, |
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{ |
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0x000000, 0x000000, 0x000000, 0x000000, |
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0x000000, 0x000020, 0x0000c0, 0x000000, |
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0x000000, 0x000000, 0x000000, 0x000000 |
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}, |
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}; |
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static const struct crci_config config_apq8064 = { |
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.num_rows = ARRAY_SIZE(crci_apq8064), |
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.array = crci_apq8064, |
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}; |
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static const unsigned int crci_msm8960[][MAX_GSBI] = { |
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{ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000400, 0x000000, 0x000000, |
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0x000000, 0x000000, 0x000000, 0x000000 |
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}, |
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{ |
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0x000000, 0x000000, 0x000000, 0x000000, |
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0x000000, 0x000020, 0x0000c0, 0x000300, |
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0x001800, 0x006000, 0x000000, 0x000000 |
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}, |
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}; |
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static const struct crci_config config_msm8960 = { |
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.num_rows = ARRAY_SIZE(crci_msm8960), |
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.array = crci_msm8960, |
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}; |
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static const unsigned int crci_msm8660[][MAX_GSBI] = { |
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{ /* ADM 0 - B */ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000c00, 0x003000, 0x00c000, |
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0x030000, 0x0c0000, 0x300000, 0xc00000 |
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}, |
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{ /* ADM 0 - B */ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000c00, 0x003000, 0x00c000, |
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0x030000, 0x0c0000, 0x300000, 0xc00000 |
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}, |
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{ /* ADM 1 - A */ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000c00, 0x003000, 0x00c000, |
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0x030000, 0x0c0000, 0x300000, 0xc00000 |
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}, |
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{ /* ADM 1 - B */ |
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0x000003, 0x00000c, 0x000030, 0x0000c0, |
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0x000300, 0x000c00, 0x003000, 0x00c000, |
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0x030000, 0x0c0000, 0x300000, 0xc00000 |
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}, |
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}; |
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static const struct crci_config config_msm8660 = { |
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.num_rows = ARRAY_SIZE(crci_msm8660), |
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.array = crci_msm8660, |
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}; |
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struct gsbi_info { |
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struct clk *hclk; |
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u32 mode; |
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u32 crci; |
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struct regmap *tcsr; |
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}; |
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static const struct of_device_id tcsr_dt_match[] = { |
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{ .compatible = "qcom,tcsr-ipq8064", .data = &config_ipq8064}, |
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{ .compatible = "qcom,tcsr-apq8064", .data = &config_apq8064}, |
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{ .compatible = "qcom,tcsr-msm8960", .data = &config_msm8960}, |
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{ .compatible = "qcom,tcsr-msm8660", .data = &config_msm8660}, |
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{ }, |
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}; |
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static int gsbi_probe(struct platform_device *pdev) |
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{ |
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struct device_node *node = pdev->dev.of_node; |
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struct device_node *tcsr_node; |
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const struct of_device_id *match; |
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void __iomem *base; |
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struct gsbi_info *gsbi; |
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int i, ret; |
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u32 mask, gsbi_num; |
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const struct crci_config *config = NULL; |
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gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL); |
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if (!gsbi) |
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return -ENOMEM; |
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base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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/* get the tcsr node and setup the config and regmap */ |
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gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr"); |
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if (!IS_ERR(gsbi->tcsr)) { |
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tcsr_node = of_parse_phandle(node, "syscon-tcsr", 0); |
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if (tcsr_node) { |
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match = of_match_node(tcsr_dt_match, tcsr_node); |
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if (match) |
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config = match->data; |
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else |
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dev_warn(&pdev->dev, "no matching TCSR\n"); |
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of_node_put(tcsr_node); |
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} |
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} |
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if (of_property_read_u32(node, "cell-index", &gsbi_num)) { |
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dev_err(&pdev->dev, "missing cell-index\n"); |
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return -EINVAL; |
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} |
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if (gsbi_num < 1 || gsbi_num > MAX_GSBI) { |
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dev_err(&pdev->dev, "invalid cell-index\n"); |
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return -EINVAL; |
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} |
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if (of_property_read_u32(node, "qcom,mode", &gsbi->mode)) { |
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dev_err(&pdev->dev, "missing mode configuration\n"); |
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return -EINVAL; |
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} |
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/* not required, so default to 0 if not present */ |
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of_property_read_u32(node, "qcom,crci", &gsbi->crci); |
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dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", |
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gsbi->mode, gsbi->crci); |
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gsbi->hclk = devm_clk_get(&pdev->dev, "iface"); |
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if (IS_ERR(gsbi->hclk)) |
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return PTR_ERR(gsbi->hclk); |
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clk_prepare_enable(gsbi->hclk); |
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writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci, |
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base + GSBI_CTRL_REG); |
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/* |
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* modify tcsr to reflect mode and ADM CRCI mux |
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* Each gsbi contains a pair of bits, one for RX and one for TX |
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* SPI mode requires both bits cleared, otherwise they are set |
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*/ |
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if (config) { |
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for (i = 0; i < config->num_rows; i++) { |
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mask = config->array[i][gsbi_num - 1]; |
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if (gsbi->mode == GSBI_PROT_SPI) |
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regmap_update_bits(gsbi->tcsr, |
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TCSR_ADM_CRCI_BASE + 4 * i, mask, 0); |
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else |
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regmap_update_bits(gsbi->tcsr, |
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TCSR_ADM_CRCI_BASE + 4 * i, mask, mask); |
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} |
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} |
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/* make sure the gsbi control write is not reordered */ |
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wmb(); |
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platform_set_drvdata(pdev, gsbi); |
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ret = of_platform_populate(node, NULL, NULL, &pdev->dev); |
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if (ret) |
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clk_disable_unprepare(gsbi->hclk); |
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return ret; |
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} |
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static int gsbi_remove(struct platform_device *pdev) |
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{ |
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struct gsbi_info *gsbi = platform_get_drvdata(pdev); |
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clk_disable_unprepare(gsbi->hclk); |
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return 0; |
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} |
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static const struct of_device_id gsbi_dt_match[] = { |
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{ .compatible = "qcom,gsbi-v1.0.0", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, gsbi_dt_match); |
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static struct platform_driver gsbi_driver = { |
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.driver = { |
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.name = "gsbi", |
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.of_match_table = gsbi_dt_match, |
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}, |
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.probe = gsbi_probe, |
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.remove = gsbi_remove, |
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}; |
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module_platform_driver(gsbi_driver); |
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MODULE_AUTHOR("Andy Gross <[email protected]>"); |
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MODULE_DESCRIPTION("QCOM GSBI driver"); |
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MODULE_LICENSE("GPL v2");
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