529 lines
11 KiB
C
529 lines
11 KiB
C
/*
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* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/ahci_platform.h>
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#include <linux/phy/phy.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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struct msm_ahci_clk_info {
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struct list_head list;
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struct clk *clk;
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const char *name;
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u32 max_freq;
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bool enabled;
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};
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struct msm_ahci_host {
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struct platform_device *ahci_pdev;
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struct list_head clk_list_head;
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void __iomem *ahci_base;
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struct phy *phy;
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bool phy_powered_on;
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};
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static int msm_ahci_enable_clk(struct device *dev,
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struct msm_ahci_clk_info *clki)
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{
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int ret = 0;
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if (clki->enabled)
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goto out;
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ret = clk_prepare_enable(clki->clk);
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if (ret) {
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dev_err(dev, "%s: %s prepare enable failed, %d\n",
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__func__, clki->name, ret);
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} else {
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clki->enabled = true;
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dev_dbg(dev, "%s: clk: %s enabled\n",
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__func__, clki->name);
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}
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out:
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return ret;
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}
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static void msm_ahci_disable_clk(struct device *dev,
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struct msm_ahci_clk_info *clki)
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{
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if (!clki->enabled)
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return;
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clk_disable_unprepare(clki->clk);
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clki->enabled = false;
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dev_dbg(dev, "%s: clk: %s disabled\n",
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__func__, clki->name);
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}
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static int msm_ahci_setup_asic_rbc_clks(struct msm_ahci_host *host, bool on)
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{
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int ret = 0;
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struct device *dev = host->ahci_pdev->dev.parent;
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struct msm_ahci_clk_info *clki;
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struct list_head *head = &host->clk_list_head;
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if (!head || list_empty(head))
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goto out;
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/*
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* asic0_clk and rbc0_clk should be enabled/disabled
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* only when PHY is powered on.
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*/
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if (!host->phy_powered_on)
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goto out;
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gate_ungate:
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list_for_each_entry(clki, head, list) {
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if (IS_ERR_OR_NULL(clki->clk))
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continue;
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if (!strcmp(clki->name, "asic0_clk") ||
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!strcmp(clki->name, "rbc0_clk")) {
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if (on)
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ret = msm_ahci_enable_clk(dev, clki);
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else
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msm_ahci_disable_clk(dev, clki);
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}
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}
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out:
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if (ret) {
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on = false;
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goto gate_ungate;
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}
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return ret;
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}
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static int msm_ahci_setup_clocks(struct msm_ahci_host *host, bool on)
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{
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int ret = 0;
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struct device *dev = host->ahci_pdev->dev.parent;
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struct msm_ahci_clk_info *clki;
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struct list_head *head = &host->clk_list_head;
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if (!head || list_empty(head))
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goto out;
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gate_ungate:
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list_for_each_entry(clki, head, list) {
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if (IS_ERR_OR_NULL(clki->clk))
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continue;
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/*
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* asic0_clk and rbc0_clk are handled separately
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* see msm_ahci_setup_asic_rbc_clks().
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*/
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if (!strcmp(clki->name, "asic0_clk") ||
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!strcmp(clki->name, "rbc0_clk"))
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continue;
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if (on)
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ret = msm_ahci_enable_clk(dev, clki);
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else
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msm_ahci_disable_clk(dev, clki);
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}
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out:
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if (ret) {
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on = false;
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goto gate_ungate;
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}
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return ret;
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}
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static int msm_ahci_get_clocks(struct msm_ahci_host *host)
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{
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int ret = 0;
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struct msm_ahci_clk_info *clki;
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struct device *dev = host->ahci_pdev->dev.parent;
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struct list_head *head = &host->clk_list_head;
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if (!head || list_empty(head))
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goto out;
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list_for_each_entry(clki, head, list) {
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if (!clki->name)
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continue;
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clki->clk = devm_clk_get(dev, clki->name);
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if (IS_ERR(clki->clk)) {
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ret = PTR_ERR(clki->clk);
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dev_err(dev, "%s: %s clk get failed, %d\n",
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__func__, clki->name, ret);
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goto out;
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}
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if (clki->max_freq) {
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ret = clk_set_rate(clki->clk, clki->max_freq);
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if (ret) {
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dev_err(dev, "%s: %s clk set rate(%dHz) failed, %d\n",
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__func__, clki->name,
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clki->max_freq, ret);
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goto out;
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}
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}
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dev_dbg(dev, "%s: clk: %s, rate: %lu\n", __func__,
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clki->name, clk_get_rate(clki->clk));
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}
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out:
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return ret;
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}
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static int msm_ahci_parse_clock_info(struct msm_ahci_host *host)
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{
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int ret = 0;
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int cnt;
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int i;
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struct device *dev = host->ahci_pdev->dev.parent;
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struct device_node *np = dev->of_node;
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char *name;
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u32 *clkfreq = NULL;
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struct msm_ahci_clk_info *clki;
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if (!np)
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goto out;
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INIT_LIST_HEAD(&host->clk_list_head);
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cnt = of_property_count_strings(np, "clock-names");
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if (!cnt || (cnt == -EINVAL)) {
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dev_info(dev, "%s: Unable to find clocks, assuming enabled\n",
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__func__);
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} else if (cnt < 0) {
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dev_err(dev, "%s: count clock strings failed, err %d\n",
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__func__, cnt);
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ret = cnt;
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}
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if (cnt <= 0)
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goto out;
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clkfreq = kzalloc(cnt * sizeof(*clkfreq), GFP_KERNEL);
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if (!clkfreq) {
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ret = -ENOMEM;
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dev_err(dev, "%s: memory alloc failed\n", __func__);
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goto out;
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}
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ret = of_property_read_u32_array(np,
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"max-clock-frequency-hz", clkfreq, cnt);
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if (ret && (ret != -EINVAL)) {
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dev_err(dev, "%s: invalid max-clock-frequency-hz property, %d\n",
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__func__, ret);
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goto out;
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}
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for (i = 0; i < cnt; i++) {
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ret = of_property_read_string_index(np,
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"clock-names", i, (const char **)&name);
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if (ret)
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goto out;
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clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
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if (!clki) {
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ret = -ENOMEM;
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goto out;
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}
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clki->max_freq = clkfreq[i];
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clki->name = kstrdup(name, GFP_KERNEL);
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list_add_tail(&clki->list, &host->clk_list_head);
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}
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out:
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kfree(clkfreq);
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return ret;
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}
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static int msm_ahci_init_clocks(struct msm_ahci_host *host)
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{
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int ret = 0;
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ret = msm_ahci_parse_clock_info(host);
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if (ret)
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goto out;
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ret = msm_ahci_get_clocks(host);
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if (ret)
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goto out;
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ret = msm_ahci_setup_clocks(host, true);
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if (ret)
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goto out;
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out:
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return ret;
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}
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static void msm_ahci_exit_clocks(struct msm_ahci_host *host)
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{
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msm_ahci_setup_clocks(host, false);
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}
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static int msm_ahci_init_phy(struct msm_ahci_host *host)
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{
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int ret = 0;
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struct device *dev = host->ahci_pdev->dev.parent;
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host->phy = devm_phy_get(dev, "sata-6g");
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if (IS_ERR(host->phy)) {
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ret = PTR_ERR(host->phy);
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dev_err(dev, "PHY get failed %d\n", ret);
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goto out;
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}
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ret = phy_init(host->phy);
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if (ret) {
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dev_err(dev, "PHY initialization failed %d\n", ret);
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goto out;
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}
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ret = phy_power_on(host->phy);
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if (ret) {
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dev_err(dev, "PHY power on failed %d\n", ret);
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goto out;
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}
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host->phy_powered_on = true;
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/* asic0 and rbc0 clks needs to be ungated only after phy power on */
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ret = msm_ahci_setup_asic_rbc_clks(host, true);
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if (ret) {
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dev_err(dev, "failed to enable asic0/rbc0 clks %d", ret);
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goto out;
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}
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out:
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return ret;
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}
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static void msm_ahci_exit_phy(struct msm_ahci_host *host)
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{
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msm_ahci_setup_asic_rbc_clks(host, false);
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phy_power_off(host->phy);
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host->phy_powered_on = false;
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}
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static int msm_ahci_init(struct device *ahci_dev, void __iomem *addr)
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{
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int ret;
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struct device *dev = ahci_dev->parent;
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struct msm_ahci_host *host = dev_get_drvdata(dev);
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/* Save ahci mmio to access vendor specific registers */
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host->ahci_base = addr;
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ret = msm_ahci_init_clocks(host);
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if (ret) {
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dev_err(dev, "AHCI clk init failed with err=%d\n", ret);
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goto out;
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}
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ret = msm_ahci_init_phy(host);
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if (ret) {
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dev_err(dev, "SATA PHY init failed with err=%d\n", ret);
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goto out_exit_clks;
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}
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return 0;
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out_exit_clks:
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msm_ahci_exit_clocks(host);
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out:
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return ret;
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}
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static void msm_ahci_exit(struct device *ahci_dev)
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{
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struct device *dev = ahci_dev->parent;
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struct msm_ahci_host *host = dev_get_drvdata(dev);
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msm_ahci_exit_phy(host);
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msm_ahci_exit_clocks(host);
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}
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static int msm_ahci_suspend(struct device *ahci_dev)
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{
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int ret;
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struct device *dev = ahci_dev->parent;
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struct msm_ahci_host *host = dev_get_drvdata(dev);
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msm_ahci_setup_asic_rbc_clks(host, false);
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ret = phy_power_off(host->phy);
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if (ret) {
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dev_err(dev, "%s: PHY power off failed %d\n", __func__, ret);
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goto out;
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} else {
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host->phy_powered_on = false;
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}
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msm_ahci_setup_clocks(host, false);
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out:
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return ret;
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}
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static int msm_ahci_resume(struct device *ahci_dev)
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{
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int ret;
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struct device *dev = ahci_dev->parent;
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struct msm_ahci_host *host = dev_get_drvdata(dev);
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ret = msm_ahci_setup_clocks(host, true);
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if (ret)
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goto out;
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ret = phy_power_on(host->phy);
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if (ret) {
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dev_err(dev, "%s: PHY power on failed %d\n", __func__, ret);
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goto out;
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} else {
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host->phy_powered_on = true;
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}
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/* asic0 and rbc0 clks needs to be ungated only after phy power on */
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ret = msm_ahci_setup_asic_rbc_clks(host, true);
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out:
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return ret;
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}
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static struct ahci_platform_data msm_ahci_pdata = {
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.init = msm_ahci_init,
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.exit = msm_ahci_exit,
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.suspend = msm_ahci_suspend,
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.resume = msm_ahci_resume,
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};
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static const struct of_device_id msm_ahci_of_match[] = {
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{ .compatible = "qcom,msm-ahci", .data = &msm_ahci_pdata },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, msm_ahci_of_match);
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static int msm_ahci_probe(struct platform_device *pdev)
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{
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int err;
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struct msm_ahci_host *host;
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struct device *dev = &pdev->dev;
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const struct of_device_id *of_id;
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const struct ahci_platform_data *pdata = NULL;
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struct platform_device *ahci_pdev;
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struct device *ahci_dev;
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int ret = 0;
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host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
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if (!host) {
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dev_err(dev, "failed to allocate memory for msm host\n");
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ret = -ENOMEM;
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goto err;
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}
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ahci_pdev = platform_device_alloc("ahci", -1);
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if (!ahci_pdev) {
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dev_err(dev, "failed to allocate ahci platform device\n");
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ret = -ENODEV;
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goto err;
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}
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ahci_dev = &ahci_pdev->dev;
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ahci_dev->parent = dev;
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if (!dev->dma_mask)
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dev->dma_mask = &dev->coherent_dma_mask;
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if (!dma_set_mask(dev, DMA_BIT_MASK(64))) {
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dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
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} else if (!dma_set_mask(dev, DMA_BIT_MASK(32))) {
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dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
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} else {
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err = -EIO;
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dev_err(dev, "unable to set dma mask\n");
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goto err_put_device;
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}
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ahci_dev->dma_mask = dev->dma_mask;
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ahci_dev->dma_parms = dev->dma_parms;
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dma_set_coherent_mask(ahci_dev, dev->coherent_dma_mask);
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host->ahci_pdev = ahci_pdev;
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platform_set_drvdata(pdev, host);
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of_id = of_match_device(msm_ahci_of_match, dev);
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if (of_id) {
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pdata = of_id->data;
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} else {
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ret = -EINVAL;
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dev_err(dev, "pdata is required to initialze ahci %d\n", ret);
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goto err;
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}
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ahci_dev->of_node = dev->of_node;
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ret = platform_device_add_resources(ahci_pdev,
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pdev->resource, pdev->num_resources);
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if (ret) {
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dev_err(dev, "failed to add resources %d\n", ret);
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goto err_put_device;
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}
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ret = platform_device_add_data(ahci_pdev, pdata, sizeof(*pdata));
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if (ret) {
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dev_err(dev, "failed to add pdata %d\n", ret);
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goto err_put_device;
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}
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ret = platform_device_add(ahci_pdev);
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if (ret) {
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dev_err(dev, "failed to register ahci device %d\n", ret);
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goto err_put_device;
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}
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return 0;
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err_put_device:
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platform_device_put(ahci_pdev);
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err:
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return ret;
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}
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static int msm_ahci_remove(struct platform_device *pdev)
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{
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struct msm_ahci_host *host = platform_get_drvdata(pdev);
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platform_device_unregister(host->ahci_pdev);
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return 0;
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}
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static struct platform_driver msm_ahci_driver = {
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.probe = msm_ahci_probe,
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.remove = msm_ahci_remove,
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.driver = {
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.name = "ahci-msm",
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.owner = THIS_MODULE,
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.of_match_table = msm_ahci_of_match,
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},
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};
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module_platform_driver(msm_ahci_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("AHCI platform MSM Glue Layer");
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