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alistair23-linux/arch/arm/mach-imx/pm-imx5.c
Johannes Berg c553138fbd ARM: imx: use endian-safe readl/readw/writel/writew 
Instead of __raw_*, define imx_* to *_relaxed and use those.

Using imx_* was requested by Arnd because *_relaxed tends to
indicate that the code was carefully reviewed to not require
any synchronisation and otherwise be safe, which isn't the
case here with the automatic conversion.

The conversion itself was done using the following spatch
(since that automatically adjusts the coding style unlike
a simple search&replace).

@@
expression E1, E2;
@@
-__raw_writel(E1, E2)
+imx_writel(E1, E2)
@@
expression E1, E2;
@@
-__raw_writew(E1, E2)
+imx_writew(E1, E2)
@@
expression E1;
@@
-__raw_readl(E1)
+imx_readl(E1)
@@
expression E1;
@@
-__raw_readw(E1)
+imx_readw(E1)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
2016-02-02 13:24:17 +08:00

425 lines
11 KiB
C
Raw Blame History

/*
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/suspend.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/genalloc.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <asm/cacheflush.h>
#include <asm/fncpy.h>
#include <asm/system_misc.h>
#include <asm/tlbflush.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
#define MXC_CCM_CLPCR 0x54
#define MXC_CCM_CLPCR_LPM_OFFSET 0
#define MXC_CCM_CLPCR_LPM_MASK 0x3
#define MXC_CCM_CLPCR_STBY_COUNT_OFFSET 9
#define MXC_CCM_CLPCR_VSTBY (0x1 << 8)
#define MXC_CCM_CLPCR_SBYOS (0x1 << 6)
#define MXC_CORTEXA8_PLAT_LPC 0xc
#define MXC_CORTEXA8_PLAT_LPC_DSM (1 << 0)
#define MXC_CORTEXA8_PLAT_LPC_DBG_DSM (1 << 1)
#define MXC_SRPG_NEON_SRPGCR 0x280
#define MXC_SRPG_ARM_SRPGCR 0x2a0
#define MXC_SRPG_EMPGC0_SRPGCR 0x2c0
#define MXC_SRPG_EMPGC1_SRPGCR 0x2d0
#define MXC_SRPGCR_PCR 1
/*
* The WAIT_UNCLOCKED_POWER_OFF state only requires <= 500ns to exit.
* This is also the lowest power state possible without affecting
* non-cpu parts of the system. For these reasons, imx5 should default
* to always using this state for cpu idling. The PM_SUSPEND_STANDBY also
* uses this state and needs to take no action when registers remain confgiured
* for this state.
*/
#define IMX5_DEFAULT_CPU_IDLE_STATE WAIT_UNCLOCKED_POWER_OFF
struct imx5_suspend_io_state {
u32 offset;
u32 clear;
u32 set;
u32 saved_value;
};
struct imx5_pm_data {
phys_addr_t ccm_addr;
phys_addr_t cortex_addr;
phys_addr_t gpc_addr;
phys_addr_t m4if_addr;
phys_addr_t iomuxc_addr;
void (*suspend_asm)(void __iomem *ocram_vbase);
const u32 *suspend_asm_sz;
const struct imx5_suspend_io_state *suspend_io_config;
int suspend_io_count;
};
static const struct imx5_suspend_io_state imx53_suspend_io_config[] = {
#define MX53_DSE_HIGHZ_MASK (0x7 << 19)
{.offset = 0x584, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM0 */
{.offset = 0x594, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM1 */
{.offset = 0x560, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM2 */
{.offset = 0x554, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM3 */
{.offset = 0x574, .clear = MX53_DSE_HIGHZ_MASK}, /* CAS */
{.offset = 0x588, .clear = MX53_DSE_HIGHZ_MASK}, /* RAS */
{.offset = 0x578, .clear = MX53_DSE_HIGHZ_MASK}, /* SDCLK_0 */
{.offset = 0x570, .clear = MX53_DSE_HIGHZ_MASK}, /* SDCLK_1 */
{.offset = 0x580, .clear = MX53_DSE_HIGHZ_MASK}, /* SDODT0 */
{.offset = 0x564, .clear = MX53_DSE_HIGHZ_MASK}, /* SDODT1 */
{.offset = 0x57c, .clear = MX53_DSE_HIGHZ_MASK}, /* SDQS0 */
{.offset = 0x590, .clear = MX53_DSE_HIGHZ_MASK}, /* SDQS1 */
{.offset = 0x568, .clear = MX53_DSE_HIGHZ_MASK}, /* SDQS2 */
{.offset = 0x558, .clear = MX53_DSE_HIGHZ_MASK}, /* SDSQ3 */
{.offset = 0x6f0, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_ADDS */
{.offset = 0x718, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_BODS */
{.offset = 0x71c, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_B1DS */
{.offset = 0x728, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_B2DS */
{.offset = 0x72c, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_B3DS */
/* Controls the CKE signal which is required to leave self refresh */
{.offset = 0x720, .clear = MX53_DSE_HIGHZ_MASK, .set = 1 << 19}, /* CTLDS */
};
static const struct imx5_pm_data imx51_pm_data __initconst = {
.ccm_addr = 0x73fd4000,
.cortex_addr = 0x83fa0000,
.gpc_addr = 0x73fd8000,
};
static const struct imx5_pm_data imx53_pm_data __initconst = {
.ccm_addr = 0x53fd4000,
.cortex_addr = 0x63fa0000,
.gpc_addr = 0x53fd8000,
.m4if_addr = 0x63fd8000,
.iomuxc_addr = 0x53fa8000,
.suspend_asm = &imx53_suspend,
.suspend_asm_sz = &imx53_suspend_sz,
.suspend_io_config = imx53_suspend_io_config,
.suspend_io_count = ARRAY_SIZE(imx53_suspend_io_config),
};
#define MX5_MAX_SUSPEND_IOSTATE ARRAY_SIZE(imx53_suspend_io_config)
/*
* This structure is for passing necessary data for low level ocram
* suspend code(arch/arm/mach-imx/suspend-imx53.S), if this struct
* definition is changed, the offset definition in that file
* must be also changed accordingly otherwise, the suspend to ocram
* function will be broken!
*/
struct imx5_cpu_suspend_info {
void __iomem *m4if_base;
void __iomem *iomuxc_base;
u32 io_count;
struct imx5_suspend_io_state io_state[MX5_MAX_SUSPEND_IOSTATE];
} __aligned(8);
static void __iomem *ccm_base;
static void __iomem *cortex_base;
static void __iomem *gpc_base;
static void __iomem *suspend_ocram_base;
static void (*imx5_suspend_in_ocram_fn)(void __iomem *ocram_vbase);
/*
* set cpu low power mode before WFI instruction. This function is called
* mx5 because it can be used for mx51, and mx53.
*/
static void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
{
u32 plat_lpc, arm_srpgcr, ccm_clpcr;
u32 empgc0, empgc1;
int stop_mode = 0;
/* always allow platform to issue a deep sleep mode request */
plat_lpc = imx_readl(cortex_base + MXC_CORTEXA8_PLAT_LPC) &
~(MXC_CORTEXA8_PLAT_LPC_DSM);
ccm_clpcr = imx_readl(ccm_base + MXC_CCM_CLPCR) &
~(MXC_CCM_CLPCR_LPM_MASK);
arm_srpgcr = imx_readl(gpc_base + MXC_SRPG_ARM_SRPGCR) &
~(MXC_SRPGCR_PCR);
empgc0 = imx_readl(gpc_base + MXC_SRPG_EMPGC0_SRPGCR) &
~(MXC_SRPGCR_PCR);
empgc1 = imx_readl(gpc_base + MXC_SRPG_EMPGC1_SRPGCR) &
~(MXC_SRPGCR_PCR);
switch (mode) {
case WAIT_CLOCKED:
break;
case WAIT_UNCLOCKED:
ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
break;
case WAIT_UNCLOCKED_POWER_OFF:
case STOP_POWER_OFF:
plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
| MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
if (mode == WAIT_UNCLOCKED_POWER_OFF) {
ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
stop_mode = 0;
} else {
ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
ccm_clpcr |= 0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET;
ccm_clpcr |= MXC_CCM_CLPCR_VSTBY;
ccm_clpcr |= MXC_CCM_CLPCR_SBYOS;
stop_mode = 1;
}
arm_srpgcr |= MXC_SRPGCR_PCR;
break;
case STOP_POWER_ON:
ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
break;
default:
printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
return;
}
imx_writel(plat_lpc, cortex_base + MXC_CORTEXA8_PLAT_LPC);
imx_writel(ccm_clpcr, ccm_base + MXC_CCM_CLPCR);
imx_writel(arm_srpgcr, gpc_base + MXC_SRPG_ARM_SRPGCR);
imx_writel(arm_srpgcr, gpc_base + MXC_SRPG_NEON_SRPGCR);
if (stop_mode) {
empgc0 |= MXC_SRPGCR_PCR;
empgc1 |= MXC_SRPGCR_PCR;
imx_writel(empgc0, gpc_base + MXC_SRPG_EMPGC0_SRPGCR);
imx_writel(empgc1, gpc_base + MXC_SRPG_EMPGC1_SRPGCR);
}
}
static int mx5_suspend_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
mx5_cpu_lp_set(STOP_POWER_OFF);
break;
case PM_SUSPEND_STANDBY:
/* DEFAULT_IDLE_STATE already configured */
break;
default:
return -EINVAL;
}
if (state == PM_SUSPEND_MEM) {
local_flush_tlb_all();
flush_cache_all();
/*clear the EMPGC0/1 bits */
imx_writel(0, gpc_base + MXC_SRPG_EMPGC0_SRPGCR);
imx_writel(0, gpc_base + MXC_SRPG_EMPGC1_SRPGCR);
if (imx5_suspend_in_ocram_fn)
imx5_suspend_in_ocram_fn(suspend_ocram_base);
else
cpu_do_idle();
} else {
cpu_do_idle();
}
/* return registers to default idle state */
mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
return 0;
}
static int mx5_pm_valid(suspend_state_t state)
{
return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
}
static const struct platform_suspend_ops mx5_suspend_ops = {
.valid = mx5_pm_valid,
.enter = mx5_suspend_enter,
};
static inline int imx5_cpu_do_idle(void)
{
int ret = tzic_enable_wake();
if (likely(!ret))
cpu_do_idle();
return ret;
}
static void imx5_pm_idle(void)
{
imx5_cpu_do_idle();
}
static int __init imx_suspend_alloc_ocram(
size_t size,
void __iomem **virt_out,
phys_addr_t *phys_out)
{
struct device_node *node;
struct platform_device *pdev;
struct gen_pool *ocram_pool;
unsigned long ocram_base;
void __iomem *virt;
phys_addr_t phys;
int ret = 0;
/* Copied from imx6: TODO factorize */
node = of_find_compatible_node(NULL, NULL, "mmio-sram");
if (!node) {
pr_warn("%s: failed to find ocram node!\n", __func__);
return -ENODEV;
}
pdev = of_find_device_by_node(node);
if (!pdev) {
pr_warn("%s: failed to find ocram device!\n", __func__);
ret = -ENODEV;
goto put_node;
}
ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
goto put_node;
}
ocram_base = gen_pool_alloc(ocram_pool, size);
if (!ocram_base) {
pr_warn("%s: unable to alloc ocram!\n", __func__);
ret = -ENOMEM;
goto put_node;
}
phys = gen_pool_virt_to_phys(ocram_pool, ocram_base);
virt = __arm_ioremap_exec(phys, size, false);
if (phys_out)
*phys_out = phys;
if (virt_out)
*virt_out = virt;
put_node:
of_node_put(node);
return ret;
}
static int __init imx5_suspend_init(const struct imx5_pm_data *soc_data)
{
struct imx5_cpu_suspend_info *suspend_info;
int ret;
/* Need this to avoid compile error due to const typeof in fncpy.h */
void (*suspend_asm)(void __iomem *) = soc_data->suspend_asm;
if (!suspend_asm)
return 0;
if (!soc_data->suspend_asm_sz || !*soc_data->suspend_asm_sz)
return -EINVAL;
ret = imx_suspend_alloc_ocram(
*soc_data->suspend_asm_sz + sizeof(*suspend_info),
&suspend_ocram_base, NULL);
if (ret)
return ret;
suspend_info = suspend_ocram_base;
suspend_info->io_count = soc_data->suspend_io_count;
memcpy(suspend_info->io_state, soc_data->suspend_io_config,
sizeof(*suspend_info->io_state) * soc_data->suspend_io_count);
suspend_info->m4if_base = ioremap(soc_data->m4if_addr, SZ_16K);
if (!suspend_info->m4if_base) {
ret = -ENOMEM;
goto failed_map_m4if;
}
suspend_info->iomuxc_base = ioremap(soc_data->iomuxc_addr, SZ_16K);
if (!suspend_info->iomuxc_base) {
ret = -ENOMEM;
goto failed_map_iomuxc;
}
imx5_suspend_in_ocram_fn = fncpy(
suspend_ocram_base + sizeof(*suspend_info),
suspend_asm,
*soc_data->suspend_asm_sz);
return 0;
failed_map_iomuxc:
iounmap(suspend_info->m4if_base);
failed_map_m4if:
return ret;
}
static int __init imx5_pm_common_init(const struct imx5_pm_data *data)
{
int ret;
struct clk *gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
if (IS_ERR(gpc_dvfs_clk))
return PTR_ERR(gpc_dvfs_clk);
ret = clk_prepare_enable(gpc_dvfs_clk);
if (ret)
return ret;
arm_pm_idle = imx5_pm_idle;
ccm_base = ioremap(data->ccm_addr, SZ_16K);
cortex_base = ioremap(data->cortex_addr, SZ_16K);
gpc_base = ioremap(data->gpc_addr, SZ_16K);
WARN_ON(!ccm_base || !cortex_base || !gpc_base);
/* Set the registers to the default cpu idle state. */
mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
ret = imx5_cpuidle_init();
if (ret)
pr_warn("%s: cpuidle init failed %d\n", __func__, ret);
ret = imx5_suspend_init(data);
if (ret)
pr_warn("%s: No DDR LPM support with suspend %d!\n",
__func__, ret);
suspend_set_ops(&mx5_suspend_ops);
return 0;
}
void __init imx51_pm_init(void)
{
if (IS_ENABLED(CONFIG_SOC_IMX51))
imx5_pm_common_init(&imx51_pm_data);
}
void __init imx53_pm_init(void)
{
if (IS_ENABLED(CONFIG_SOC_IMX53))
imx5_pm_common_init(&imx53_pm_data);
}
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