mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-28 09:22:08 +00:00
83bce34420
After commit 0edb555a65 ("platform: Make platform_driver::remove()
return void") .remove() is (again) the right callback to implement for
platform drivers.
Convert all platform drivers below drivers/power/ to use .remove(), with
the eventual goal to drop struct platform_driver::remove_new(). As
.remove() and .remove_new() have the same prototypes, conversion is done
by just changing the structure member name in the driver initializer.
While touching these files, make indention of the struct initializer
consistent in several files.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20241010203622.839625-6-u.kleine-koenig@baylibre.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
237 lines
6.1 KiB
C
237 lines
6.1 KiB
C
/*
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* Atmel AT91 SAM9 SoCs reset code
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*
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* Copyright (C) 2007 Atmel Corporation.
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* Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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* Copyright (C) 2014 Free Electrons
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/clk.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_address.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <soc/at91/at91sam9_ddrsdr.h>
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#define AT91_SHDW_CR 0x00 /* Shut Down Control Register */
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#define AT91_SHDW_SHDW BIT(0) /* Shut Down command */
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#define AT91_SHDW_KEY (0xa5 << 24) /* KEY Password */
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#define AT91_SHDW_MR 0x04 /* Shut Down Mode Register */
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#define AT91_SHDW_WKMODE0 GENMASK(2, 0) /* Wake-up 0 Mode Selection */
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#define AT91_SHDW_CPTWK0_MAX 0xf /* Maximum Counter On Wake Up 0 */
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#define AT91_SHDW_CPTWK0 (AT91_SHDW_CPTWK0_MAX << 4) /* Counter On Wake Up 0 */
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#define AT91_SHDW_CPTWK0_(x) ((x) << 4)
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#define AT91_SHDW_RTTWKEN BIT(16) /* Real Time Timer Wake-up Enable */
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#define AT91_SHDW_RTCWKEN BIT(17) /* Real Time Clock Wake-up Enable */
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#define AT91_SHDW_SR 0x08 /* Shut Down Status Register */
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#define AT91_SHDW_WAKEUP0 BIT(0) /* Wake-up 0 Status */
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#define AT91_SHDW_RTTWK BIT(16) /* Real-time Timer Wake-up */
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#define AT91_SHDW_RTCWK BIT(17) /* Real-time Clock Wake-up [SAM9RL] */
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enum wakeup_type {
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AT91_SHDW_WKMODE0_NONE = 0,
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AT91_SHDW_WKMODE0_HIGH = 1,
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AT91_SHDW_WKMODE0_LOW = 2,
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AT91_SHDW_WKMODE0_ANYLEVEL = 3,
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};
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static const char *shdwc_wakeup_modes[] = {
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[AT91_SHDW_WKMODE0_NONE] = "none",
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[AT91_SHDW_WKMODE0_HIGH] = "high",
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[AT91_SHDW_WKMODE0_LOW] = "low",
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[AT91_SHDW_WKMODE0_ANYLEVEL] = "any",
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};
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static struct shdwc {
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struct clk *sclk;
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void __iomem *shdwc_base;
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void __iomem *mpddrc_base;
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} at91_shdwc;
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static void at91_wakeup_status(struct platform_device *pdev)
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{
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const char *reason;
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u32 reg = readl(at91_shdwc.shdwc_base + AT91_SHDW_SR);
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/* Simple power-on, just bail out */
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if (!reg)
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return;
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if (reg & AT91_SHDW_RTTWK)
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reason = "RTT";
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else if (reg & AT91_SHDW_RTCWK)
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reason = "RTC";
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else
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reason = "unknown";
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dev_info(&pdev->dev, "Wake-Up source: %s\n", reason);
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}
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static void at91_poweroff(void)
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{
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asm volatile(
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/* Align to cache lines */
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".balign 32\n\t"
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/* Ensure AT91_SHDW_CR is in the TLB by reading it */
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" ldr r6, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
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/* Power down SDRAM0 */
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" tst %0, #0\n\t"
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" beq 1f\n\t"
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" str %1, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t"
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/* Shutdown CPU */
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"1: str %3, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
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" b .\n\t"
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:
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: "r" (at91_shdwc.mpddrc_base),
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"r" cpu_to_le32(AT91_DDRSDRC_LPDDR2_PWOFF),
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"r" (at91_shdwc.shdwc_base),
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"r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW)
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: "r6");
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}
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static int at91_poweroff_get_wakeup_mode(struct device_node *np)
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{
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const char *pm;
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unsigned int i;
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int err;
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err = of_property_read_string(np, "atmel,wakeup-mode", &pm);
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if (err < 0)
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return AT91_SHDW_WKMODE0_ANYLEVEL;
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for (i = 0; i < ARRAY_SIZE(shdwc_wakeup_modes); i++)
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if (!strcasecmp(pm, shdwc_wakeup_modes[i]))
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return i;
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return -ENODEV;
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}
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static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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int wakeup_mode;
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u32 mode = 0, tmp;
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wakeup_mode = at91_poweroff_get_wakeup_mode(np);
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if (wakeup_mode < 0) {
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dev_warn(&pdev->dev, "shdwc unknown wakeup mode\n");
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return;
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}
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if (!of_property_read_u32(np, "atmel,wakeup-counter", &tmp)) {
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if (tmp > AT91_SHDW_CPTWK0_MAX) {
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dev_warn(&pdev->dev,
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"shdwc wakeup counter 0x%x > 0x%x reduce it to 0x%x\n",
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tmp, AT91_SHDW_CPTWK0_MAX, AT91_SHDW_CPTWK0_MAX);
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tmp = AT91_SHDW_CPTWK0_MAX;
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}
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mode |= AT91_SHDW_CPTWK0_(tmp);
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}
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if (of_property_read_bool(np, "atmel,wakeup-rtc-timer"))
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mode |= AT91_SHDW_RTCWKEN;
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if (of_property_read_bool(np, "atmel,wakeup-rtt-timer"))
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mode |= AT91_SHDW_RTTWKEN;
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writel(wakeup_mode | mode, at91_shdwc.shdwc_base + AT91_SHDW_MR);
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}
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static int at91_poweroff_probe(struct platform_device *pdev)
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{
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struct device_node *np;
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u32 ddr_type;
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int ret;
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at91_shdwc.shdwc_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(at91_shdwc.shdwc_base))
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return PTR_ERR(at91_shdwc.shdwc_base);
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at91_shdwc.sclk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(at91_shdwc.sclk))
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return PTR_ERR(at91_shdwc.sclk);
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ret = clk_prepare_enable(at91_shdwc.sclk);
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if (ret) {
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dev_err(&pdev->dev, "Could not enable slow clock\n");
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return ret;
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}
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at91_wakeup_status(pdev);
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if (pdev->dev.of_node)
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at91_poweroff_dt_set_wakeup_mode(pdev);
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np = of_find_compatible_node(NULL, NULL, "atmel,sama5d3-ddramc");
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if (np) {
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at91_shdwc.mpddrc_base = of_iomap(np, 0);
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of_node_put(np);
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if (!at91_shdwc.mpddrc_base) {
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ret = -ENOMEM;
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goto clk_disable;
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}
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ddr_type = readl(at91_shdwc.mpddrc_base + AT91_DDRSDRC_MDR) &
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AT91_DDRSDRC_MD;
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if (ddr_type != AT91_DDRSDRC_MD_LPDDR2 &&
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ddr_type != AT91_DDRSDRC_MD_LPDDR3) {
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iounmap(at91_shdwc.mpddrc_base);
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at91_shdwc.mpddrc_base = NULL;
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}
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}
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pm_power_off = at91_poweroff;
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return 0;
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clk_disable:
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clk_disable_unprepare(at91_shdwc.sclk);
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return ret;
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}
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static void at91_poweroff_remove(struct platform_device *pdev)
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{
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if (pm_power_off == at91_poweroff)
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pm_power_off = NULL;
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if (at91_shdwc.mpddrc_base)
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iounmap(at91_shdwc.mpddrc_base);
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clk_disable_unprepare(at91_shdwc.sclk);
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}
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static const struct of_device_id at91_poweroff_of_match[] = {
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{ .compatible = "atmel,at91sam9260-shdwc", },
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{ .compatible = "atmel,at91sam9rl-shdwc", },
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{ .compatible = "atmel,at91sam9x5-shdwc", },
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{ /*sentinel*/ }
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};
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MODULE_DEVICE_TABLE(of, at91_poweroff_of_match);
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static struct platform_driver at91_poweroff_driver = {
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.probe = at91_poweroff_probe,
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.remove = at91_poweroff_remove,
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.driver = {
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.name = "at91-poweroff",
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.of_match_table = at91_poweroff_of_match,
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},
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};
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module_platform_driver(at91_poweroff_driver);
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MODULE_AUTHOR("Atmel Corporation");
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MODULE_DESCRIPTION("Shutdown driver for Atmel SoCs");
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MODULE_LICENSE("GPL v2");
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