Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Static Memory Controller |
| 4 | */ |
| 5 | |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/io.h> |
Rafael J. Wysocki | 2eaa03b | 2011-04-22 22:03:11 +0200 | [diff] [blame] | 10 | #include <linux/syscore_ops.h> |
Arnd Bergmann | 08d3df8 | 2019-09-01 22:26:10 +0200 | [diff] [blame] | 11 | #include <linux/soc/pxa/cpu.h> |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 12 | |
Arnd Bergmann | e6acc40 | 2022-04-04 22:37:04 +0200 | [diff] [blame] | 13 | #include "smemc.h" |
Arnd Bergmann | fd13f81 | 2019-09-18 17:42:52 +0200 | [diff] [blame] | 14 | #include <linux/soc/pxa/smemc.h> |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 15 | |
| 16 | #ifdef CONFIG_PM |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 17 | static unsigned long msc[2]; |
| 18 | static unsigned long sxcnfg, memclkcfg; |
| 19 | static unsigned long csadrcfg[4]; |
| 20 | |
Rafael J. Wysocki | 2eaa03b | 2011-04-22 22:03:11 +0200 | [diff] [blame] | 21 | static int pxa3xx_smemc_suspend(void) |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 22 | { |
Marek Vasut | ad68bb9 | 2010-11-03 16:29:35 +0100 | [diff] [blame] | 23 | msc[0] = __raw_readl(MSC0); |
| 24 | msc[1] = __raw_readl(MSC1); |
| 25 | sxcnfg = __raw_readl(SXCNFG); |
| 26 | memclkcfg = __raw_readl(MEMCLKCFG); |
| 27 | csadrcfg[0] = __raw_readl(CSADRCFG0); |
| 28 | csadrcfg[1] = __raw_readl(CSADRCFG1); |
| 29 | csadrcfg[2] = __raw_readl(CSADRCFG2); |
| 30 | csadrcfg[3] = __raw_readl(CSADRCFG3); |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 31 | |
| 32 | return 0; |
| 33 | } |
| 34 | |
Rafael J. Wysocki | 2eaa03b | 2011-04-22 22:03:11 +0200 | [diff] [blame] | 35 | static void pxa3xx_smemc_resume(void) |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 36 | { |
Marek Vasut | ad68bb9 | 2010-11-03 16:29:35 +0100 | [diff] [blame] | 37 | __raw_writel(msc[0], MSC0); |
| 38 | __raw_writel(msc[1], MSC1); |
| 39 | __raw_writel(sxcnfg, SXCNFG); |
| 40 | __raw_writel(memclkcfg, MEMCLKCFG); |
| 41 | __raw_writel(csadrcfg[0], CSADRCFG0); |
| 42 | __raw_writel(csadrcfg[1], CSADRCFG1); |
| 43 | __raw_writel(csadrcfg[2], CSADRCFG2); |
| 44 | __raw_writel(csadrcfg[3], CSADRCFG3); |
Igor Grinberg | d107a20 | 2013-01-13 13:49:47 +0200 | [diff] [blame] | 45 | /* CSMSADRCFG wakes up in its default state (0), so we need to set it */ |
| 46 | __raw_writel(0x2, CSMSADRCFG); |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 47 | } |
| 48 | |
Rafael J. Wysocki | 2eaa03b | 2011-04-22 22:03:11 +0200 | [diff] [blame] | 49 | static struct syscore_ops smemc_syscore_ops = { |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 50 | .suspend = pxa3xx_smemc_suspend, |
| 51 | .resume = pxa3xx_smemc_resume, |
| 52 | }; |
| 53 | |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 54 | static int __init smemc_init(void) |
| 55 | { |
Igor Grinberg | d107a20 | 2013-01-13 13:49:47 +0200 | [diff] [blame] | 56 | if (cpu_is_pxa3xx()) { |
| 57 | /* |
| 58 | * The only documentation we have on the |
| 59 | * Chip Select Configuration Register (CSMSADRCFG) is that |
| 60 | * it must be programmed to 0x2. |
| 61 | * Moreover, in the bit definitions, the second bit |
| 62 | * (CSMSADRCFG[1]) is called "SETALWAYS". |
| 63 | * Other bits are reserved in this register. |
| 64 | */ |
| 65 | __raw_writel(0x2, CSMSADRCFG); |
| 66 | |
Rafael J. Wysocki | 2eaa03b | 2011-04-22 22:03:11 +0200 | [diff] [blame] | 67 | register_syscore_ops(&smemc_syscore_ops); |
Igor Grinberg | d107a20 | 2013-01-13 13:49:47 +0200 | [diff] [blame] | 68 | } |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 69 | |
Rafael J. Wysocki | 2eaa03b | 2011-04-22 22:03:11 +0200 | [diff] [blame] | 70 | return 0; |
eric miao | b1d907f | 2008-01-28 23:00:02 +0000 | [diff] [blame] | 71 | } |
| 72 | subsys_initcall(smemc_init); |
| 73 | #endif |
Arnd Bergmann | fd13f81 | 2019-09-18 17:42:52 +0200 | [diff] [blame] | 74 | |
| 75 | static const unsigned int df_clkdiv[4] = { 1, 2, 4, 1 }; |
| 76 | unsigned int pxa3xx_smemc_get_memclkdiv(void) |
| 77 | { |
| 78 | unsigned long memclkcfg = __raw_readl(MEMCLKCFG); |
| 79 | |
| 80 | return df_clkdiv[(memclkcfg >> 16) & 0x3]; |
| 81 | } |