/* * Copyright (c) 2014, The Linux foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License rev 2 and * only rev 2 as published by the free Software foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> #include <dt-bindings/soc/qcom,gsbi.h> #define GSBI_CTRL_REG 0x0000 #define GSBI_PROTOCOL_SHIFT 4 #define MAX_GSBI 12 #define TCSR_ADM_CRCI_BASE 0x70 struct crci_config { u32 num_rows; const u32 (*array)[MAX_GSBI]; }; static const u32 crci_ipq8064[][MAX_GSBI] = { { 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000c00, 0x003000, 0x00c000, 0x030000, 0x0c0000, 0x300000, 0xc00000 }, { 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000c00, 0x003000, 0x00c000, 0x030000, 0x0c0000, 0x300000, 0xc00000 }, }; static const struct crci_config config_ipq8064 = { .num_rows = ARRAY_SIZE(crci_ipq8064), .array = crci_ipq8064, }; static const unsigned int crci_apq8064[][MAX_GSBI] = { { 0x001800, 0x006000, 0x000030, 0x0000c0, 0x000300, 0x000400, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000 }, { 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000020, 0x0000c0, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000 }, }; static const struct crci_config config_apq8064 = { .num_rows = ARRAY_SIZE(crci_apq8064), .array = crci_apq8064, }; static const unsigned int crci_msm8960[][MAX_GSBI] = { { 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000400, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000 }, { 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000020, 0x0000c0, 0x000300, 0x001800, 0x006000, 0x000000, 0x000000 }, }; static const struct crci_config config_msm8960 = { .num_rows = ARRAY_SIZE(crci_msm8960), .array = crci_msm8960, }; static const unsigned int crci_msm8660[][MAX_GSBI] = { { /* ADM 0 - B */ 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000c00, 0x003000, 0x00c000, 0x030000, 0x0c0000, 0x300000, 0xc00000 }, { /* ADM 0 - B */ 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000c00, 0x003000, 0x00c000, 0x030000, 0x0c0000, 0x300000, 0xc00000 }, { /* ADM 1 - A */ 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000c00, 0x003000, 0x00c000, 0x030000, 0x0c0000, 0x300000, 0xc00000 }, { /* ADM 1 - B */ 0x000003, 0x00000c, 0x000030, 0x0000c0, 0x000300, 0x000c00, 0x003000, 0x00c000, 0x030000, 0x0c0000, 0x300000, 0xc00000 }, }; static const struct crci_config config_msm8660 = { .num_rows = ARRAY_SIZE(crci_msm8660), .array = crci_msm8660, }; struct gsbi_info { struct clk *hclk; u32 mode; u32 crci; struct regmap *tcsr; }; static const struct of_device_id tcsr_dt_match[] = { { .compatible = "qcom,tcsr-ipq8064", .data = &config_ipq8064}, { .compatible = "qcom,tcsr-apq8064", .data = &config_apq8064}, { .compatible = "qcom,tcsr-msm8960", .data = &config_msm8960}, { .compatible = "qcom,tcsr-msm8660", .data = &config_msm8660}, { }, }; static int gsbi_probe(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node; struct device_node *tcsr_node; const struct of_device_id *match; struct resource *res; void __iomem *base; struct gsbi_info *gsbi; int i; u32 mask, gsbi_num; const struct crci_config *config = NULL; gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL); if (!gsbi) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); /* get the tcsr node and setup the config and regmap */ gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr"); if (!IS_ERR(gsbi->tcsr)) { tcsr_node = of_parse_phandle(node, "syscon-tcsr", 0); if (tcsr_node) { match = of_match_node(tcsr_dt_match, tcsr_node); if (match) config = match->data; else dev_warn(&pdev->dev, "no matching TCSR\n"); of_node_put(tcsr_node); } } if (of_property_read_u32(node, "cell-index", &gsbi_num)) { dev_err(&pdev->dev, "missing cell-index\n"); return -EINVAL; } if (gsbi_num < 1 || gsbi_num > MAX_GSBI) { dev_err(&pdev->dev, "invalid cell-index\n"); return -EINVAL; } if (of_property_read_u32(node, "qcom,mode", &gsbi->mode)) { dev_err(&pdev->dev, "missing mode configuration\n"); return -EINVAL; } /* not required, so default to 0 if not present */ of_property_read_u32(node, "qcom,crci", &gsbi->crci); dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", gsbi->mode, gsbi->crci); gsbi->hclk = devm_clk_get(&pdev->dev, "iface"); if (IS_ERR(gsbi->hclk)) return PTR_ERR(gsbi->hclk); clk_prepare_enable(gsbi->hclk); writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci, base + GSBI_CTRL_REG); /* * modify tcsr to reflect mode and ADM CRCI mux * Each gsbi contains a pair of bits, one for RX and one for TX * SPI mode requires both bits cleared, otherwise they are set */ if (config) { for (i = 0; i < config->num_rows; i++) { mask = config->array[i][gsbi_num - 1]; if (gsbi->mode == GSBI_PROT_SPI) regmap_update_bits(gsbi->tcsr, TCSR_ADM_CRCI_BASE + 4 * i, mask, 0); else regmap_update_bits(gsbi->tcsr, TCSR_ADM_CRCI_BASE + 4 * i, mask, mask); } } /* make sure the gsbi control write is not reordered */ wmb(); platform_set_drvdata(pdev, gsbi); return of_platform_populate(node, NULL, NULL, &pdev->dev); } static int gsbi_remove(struct platform_device *pdev) { struct gsbi_info *gsbi = platform_get_drvdata(pdev); clk_disable_unprepare(gsbi->hclk); return 0; } static const struct of_device_id gsbi_dt_match[] = { { .compatible = "qcom,gsbi-v1.0.0", }, { }, }; MODULE_DEVICE_TABLE(of, gsbi_dt_match); static struct platform_driver gsbi_driver = { .driver = { .name = "gsbi", .of_match_table = gsbi_dt_match, }, .probe = gsbi_probe, .remove = gsbi_remove, }; module_platform_driver(gsbi_driver); MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>"); MODULE_DESCRIPTION("QCOM GSBI driver"); MODULE_LICENSE("GPL v2");