summaryrefslogtreecommitdiff
path: root/arch/arm/mach-s3c/iotiming-s3c2410.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2023-02-21 02:28:57 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-02-21 02:28:57 +0300
commitff0c7e18629b8bd64681313a88ce55e182c9fee6 (patch)
tree70efa650f6458514e1d7e5e3f72cc8f87fc5cf2c /arch/arm/mach-s3c/iotiming-s3c2410.c
parent5b0ed5964928b0aaf0d644c17c886c7f5ea4bb3f (diff)
parenta1f925bc4fa899b3c0f2dcbc432d572c36e74e71 (diff)
downloadlinux-ff0c7e18629b8bd64681313a88ce55e182c9fee6.tar.xz
Merge tag 'arm-boardfile-remove-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC boardfile updates from Arnd Bergmann "Unused boardfile removal for 6.3 This is a follow-up to the deprecation of most of the old-style board files that was merged in linux-6.0, removing them for good. This branch is almost exclusively dead code removal based on those annotations. Some device driver removals went through separate subsystem trees, but the majority is in the same branch, in order to better handle dependencies between the patches and avoid breaking bisection. Unfortunately that leads to merge conflicts against other changes in the subsystem trees, but they should all be trivial to resolve by removing the files. See commit 7d0d3fa7339e ("Merge tag 'arm-boardfiles-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc") for the description of which machines were marked unused and are now removed. The only removals that got postponed are Terastation WXL (mv78xx0) and Jornada720 (StrongARM1100), which turned out to still have potential users" * tag 'arm-boardfile-remove-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (91 commits) mmc: omap: drop TPS65010 dependency ARM: pxa: restore mfp-pxa320.h usb: ohci-omap: avoid unused-variable warning ARM: debug: remove references in DEBUG_UART_8250_SHIFT to removed configs ARM: s3c: remove obsolete s3c-cpu-freq header MAINTAINERS: adjust SAMSUNG SOC CLOCK DRIVERS after s3c24xx support removal MAINTAINERS: update file entries after arm multi-platform rework and mach-pxa removal ARM: remove CONFIG_UNUSED_BOARD_FILES mfd: remove htc-pasic3 driver w1: remove ds1wm driver usb: remove ohci-tmio driver fbdev: remove w100fb driver fbdev: remove tmiofb driver mmc: remove tmio_mmc driver mfd: remove ucb1400 support mfd: remove toshiba tmio drivers rtc: remove v3020 driver power: remove pda_power supply driver ASoC: pxa: remove unused board support pcmcia: remove unused pxa/sa1100 drivers ...
Diffstat (limited to 'arch/arm/mach-s3c/iotiming-s3c2410.c')
-rw-r--r--arch/arm/mach-s3c/iotiming-s3c2410.c472
1 files changed, 0 insertions, 472 deletions
diff --git a/arch/arm/mach-s3c/iotiming-s3c2410.c b/arch/arm/mach-s3c/iotiming-s3c2410.c
deleted file mode 100644
index 09f388d8f824..000000000000
--- a/arch/arm/mach-s3c/iotiming-s3c2410.c
+++ /dev/null
@@ -1,472 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-//
-// Copyright (c) 2006-2009 Simtec Electronics
-// http://armlinux.simtec.co.uk/
-// Ben Dooks <ben@simtec.co.uk>
-//
-// S3C24XX CPU Frequency scaling - IO timing for S3C2410/S3C2440/S3C2442
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/cpufreq.h>
-#include <linux/seq_file.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-
-#include "map.h"
-#include "regs-clock.h"
-
-#include <linux/soc/samsung/s3c-cpufreq-core.h>
-
-#include "regs-mem-s3c24xx.h"
-
-#define print_ns(x) ((x) / 10), ((x) % 10)
-
-/**
- * s3c2410_print_timing - print bank timing data for debug purposes
- * @pfx: The prefix to put on the output
- * @timings: The timing inforamtion to print.
-*/
-static void s3c2410_print_timing(const char *pfx,
- struct s3c_iotimings *timings)
-{
- struct s3c2410_iobank_timing *bt;
- int bank;
-
- for (bank = 0; bank < MAX_BANKS; bank++) {
- bt = timings->bank[bank].io_2410;
- if (!bt)
- continue;
-
- printk(KERN_DEBUG "%s %d: Tacs=%d.%d, Tcos=%d.%d, Tacc=%d.%d, "
- "Tcoh=%d.%d, Tcah=%d.%d\n", pfx, bank,
- print_ns(bt->tacs),
- print_ns(bt->tcos),
- print_ns(bt->tacc),
- print_ns(bt->tcoh),
- print_ns(bt->tcah));
- }
-}
-
-/**
- * bank_reg - convert bank number to pointer to the control register.
- * @bank: The IO bank number.
- */
-static inline void __iomem *bank_reg(unsigned int bank)
-{
- return S3C2410_BANKCON0 + (bank << 2);
-}
-
-/**
- * bank_is_io - test whether bank is used for IO
- * @bankcon: The bank control register.
- *
- * This is a simplistic test to see if any BANKCON[x] is not an IO
- * bank. It currently does not take into account whether BWSCON has
- * an illegal width-setting in it, or if the pin connected to nCS[x]
- * is actually being handled as a chip-select.
- */
-static inline int bank_is_io(unsigned long bankcon)
-{
- return !(bankcon & S3C2410_BANKCON_SDRAM);
-}
-
-/**
- * to_div - convert cycle time to divisor
- * @cyc: The cycle time, in 10ths of nanoseconds.
- * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
- *
- * Convert the given cycle time into the divisor to use to obtain it from
- * HCLK.
-*/
-static inline unsigned int to_div(unsigned int cyc, unsigned int hclk_tns)
-{
- if (cyc == 0)
- return 0;
-
- return DIV_ROUND_UP(cyc, hclk_tns);
-}
-
-/**
- * calc_0124 - calculate divisor control for divisors that do /0, /1. /2 and /4
- * @cyc: The cycle time, in 10ths of nanoseconds.
- * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
- * @v: Pointer to register to alter.
- * @shift: The shift to get to the control bits.
- *
- * Calculate the divisor, and turn it into the correct control bits to
- * set in the result, @v.
- */
-static unsigned int calc_0124(unsigned int cyc, unsigned long hclk_tns,
- unsigned long *v, int shift)
-{
- unsigned int div = to_div(cyc, hclk_tns);
- unsigned long val;
-
- s3c_freq_iodbg("%s: cyc=%d, hclk=%lu, shift=%d => div %d\n",
- __func__, cyc, hclk_tns, shift, div);
-
- switch (div) {
- case 0:
- val = 0;
- break;
- case 1:
- val = 1;
- break;
- case 2:
- val = 2;
- break;
- case 3:
- case 4:
- val = 3;
- break;
- default:
- return -1;
- }
-
- *v |= val << shift;
- return 0;
-}
-
-static int calc_tacp(unsigned int cyc, unsigned long hclk, unsigned long *v)
-{
- /* Currently no support for Tacp calculations. */
- return 0;
-}
-
-/**
- * calc_tacc - calculate divisor control for tacc.
- * @cyc: The cycle time, in 10ths of nanoseconds.
- * @nwait_en: IS nWAIT enabled for this bank.
- * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
- * @v: Pointer to register to alter.
- *
- * Calculate the divisor control for tACC, taking into account whether
- * the bank has nWAIT enabled. The result is used to modify the value
- * pointed to by @v.
-*/
-static int calc_tacc(unsigned int cyc, int nwait_en,
- unsigned long hclk_tns, unsigned long *v)
-{
- unsigned int div = to_div(cyc, hclk_tns);
- unsigned long val;
-
- s3c_freq_iodbg("%s: cyc=%u, nwait=%d, hclk=%lu => div=%u\n",
- __func__, cyc, nwait_en, hclk_tns, div);
-
- /* if nWait enabled on an bank, Tacc must be at-least 4 cycles. */
- if (nwait_en && div < 4)
- div = 4;
-
- switch (div) {
- case 0:
- val = 0;
- break;
-
- case 1:
- case 2:
- case 3:
- case 4:
- val = div - 1;
- break;
-
- case 5:
- case 6:
- val = 4;
- break;
-
- case 7:
- case 8:
- val = 5;
- break;
-
- case 9:
- case 10:
- val = 6;
- break;
-
- case 11:
- case 12:
- case 13:
- case 14:
- val = 7;
- break;
-
- default:
- return -1;
- }
-
- *v |= val << 8;
- return 0;
-}
-
-/**
- * s3c2410_calc_bank - calculate bank timing information
- * @cfg: The configuration we need to calculate for.
- * @bt: The bank timing information.
- *
- * Given the cycle timine for a bank @bt, calculate the new BANKCON
- * setting for the @cfg timing. This updates the timing information
- * ready for the cpu frequency change.
- */
-static int s3c2410_calc_bank(struct s3c_cpufreq_config *cfg,
- struct s3c2410_iobank_timing *bt)
-{
- unsigned long hclk = cfg->freq.hclk_tns;
- unsigned long res;
- int ret;
-
- res = bt->bankcon;
- res &= (S3C2410_BANKCON_SDRAM | S3C2410_BANKCON_PMC16);
-
- /* tacp: 2,3,4,5 */
- /* tcah: 0,1,2,4 */
- /* tcoh: 0,1,2,4 */
- /* tacc: 1,2,3,4,6,7,10,14 (>4 for nwait) */
- /* tcos: 0,1,2,4 */
- /* tacs: 0,1,2,4 */
-
- ret = calc_0124(bt->tacs, hclk, &res, S3C2410_BANKCON_Tacs_SHIFT);
- ret |= calc_0124(bt->tcos, hclk, &res, S3C2410_BANKCON_Tcos_SHIFT);
- ret |= calc_0124(bt->tcah, hclk, &res, S3C2410_BANKCON_Tcah_SHIFT);
- ret |= calc_0124(bt->tcoh, hclk, &res, S3C2410_BANKCON_Tcoh_SHIFT);
-
- if (ret)
- return -EINVAL;
-
- ret |= calc_tacp(bt->tacp, hclk, &res);
- ret |= calc_tacc(bt->tacc, bt->nwait_en, hclk, &res);
-
- if (ret)
- return -EINVAL;
-
- bt->bankcon = res;
- return 0;
-}
-
-static const unsigned int tacc_tab[] = {
- [0] = 1,
- [1] = 2,
- [2] = 3,
- [3] = 4,
- [4] = 6,
- [5] = 9,
- [6] = 10,
- [7] = 14,
-};
-
-/**
- * get_tacc - turn tACC value into cycle time
- * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
- * @val: The bank timing register value, shifted down.
- */
-static unsigned int get_tacc(unsigned long hclk_tns,
- unsigned long val)
-{
- val &= 7;
- return hclk_tns * tacc_tab[val];
-}
-
-/**
- * get_0124 - turn 0/1/2/4 divider into cycle time
- * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
- * @val: The bank timing register value, shifed down.
- */
-static unsigned int get_0124(unsigned long hclk_tns,
- unsigned long val)
-{
- val &= 3;
- return hclk_tns * ((val == 3) ? 4 : val);
-}
-
-/**
- * s3c2410_iotiming_getbank - turn BANKCON into cycle time information
- * @cfg: The frequency configuration
- * @bt: The bank timing to fill in (uses cached BANKCON)
- *
- * Given the BANKCON setting in @bt and the current frequency settings
- * in @cfg, update the cycle timing information.
- */
-static void s3c2410_iotiming_getbank(struct s3c_cpufreq_config *cfg,
- struct s3c2410_iobank_timing *bt)
-{
- unsigned long bankcon = bt->bankcon;
- unsigned long hclk = cfg->freq.hclk_tns;
-
- bt->tcah = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcah_SHIFT);
- bt->tcoh = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcoh_SHIFT);
- bt->tcos = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcos_SHIFT);
- bt->tacs = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tacs_SHIFT);
- bt->tacc = get_tacc(hclk, bankcon >> S3C2410_BANKCON_Tacc_SHIFT);
-}
-
-/**
- * s3c2410_iotiming_debugfs - debugfs show io bank timing information
- * @seq: The seq_file to write output to using seq_printf().
- * @cfg: The current configuration.
- * @iob: The IO bank information to decode.
- */
-void s3c2410_iotiming_debugfs(struct seq_file *seq,
- struct s3c_cpufreq_config *cfg,
- union s3c_iobank *iob)
-{
- struct s3c2410_iobank_timing *bt = iob->io_2410;
- unsigned long bankcon = bt->bankcon;
- unsigned long hclk = cfg->freq.hclk_tns;
- unsigned int tacs;
- unsigned int tcos;
- unsigned int tacc;
- unsigned int tcoh;
- unsigned int tcah;
-
- seq_printf(seq, "BANKCON=0x%08lx\n", bankcon);
-
- tcah = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcah_SHIFT);
- tcoh = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcoh_SHIFT);
- tcos = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcos_SHIFT);
- tacs = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tacs_SHIFT);
- tacc = get_tacc(hclk, bankcon >> S3C2410_BANKCON_Tacc_SHIFT);
-
- seq_printf(seq,
- "\tRead: Tacs=%d.%d, Tcos=%d.%d, Tacc=%d.%d, Tcoh=%d.%d, Tcah=%d.%d\n",
- print_ns(bt->tacs),
- print_ns(bt->tcos),
- print_ns(bt->tacc),
- print_ns(bt->tcoh),
- print_ns(bt->tcah));
-
- seq_printf(seq,
- "\t Set: Tacs=%d.%d, Tcos=%d.%d, Tacc=%d.%d, Tcoh=%d.%d, Tcah=%d.%d\n",
- print_ns(tacs),
- print_ns(tcos),
- print_ns(tacc),
- print_ns(tcoh),
- print_ns(tcah));
-}
-
-/**
- * s3c2410_iotiming_calc - Calculate bank timing for frequency change.
- * @cfg: The frequency configuration
- * @iot: The IO timing information to fill out.
- *
- * Calculate the new values for the banks in @iot based on the new
- * frequency information in @cfg. This is then used by s3c2410_iotiming_set()
- * to update the timing when necessary.
- */
-int s3c2410_iotiming_calc(struct s3c_cpufreq_config *cfg,
- struct s3c_iotimings *iot)
-{
- struct s3c2410_iobank_timing *bt;
- unsigned long bankcon;
- int bank;
- int ret;
-
- for (bank = 0; bank < MAX_BANKS; bank++) {
- bankcon = __raw_readl(bank_reg(bank));
- bt = iot->bank[bank].io_2410;
-
- if (!bt)
- continue;
-
- bt->bankcon = bankcon;
-
- ret = s3c2410_calc_bank(cfg, bt);
- if (ret) {
- printk(KERN_ERR "%s: cannot calculate bank %d io\n",
- __func__, bank);
- goto err;
- }
-
- s3c_freq_iodbg("%s: bank %d: con=%08lx\n",
- __func__, bank, bt->bankcon);
- }
-
- return 0;
- err:
- return ret;
-}
-
-/**
- * s3c2410_iotiming_set - set the IO timings from the given setup.
- * @cfg: The frequency configuration
- * @iot: The IO timing information to use.
- *
- * Set all the currently used IO bank timing information generated
- * by s3c2410_iotiming_calc() once the core has validated that all
- * the new values are within permitted bounds.
- */
-void s3c2410_iotiming_set(struct s3c_cpufreq_config *cfg,
- struct s3c_iotimings *iot)
-{
- struct s3c2410_iobank_timing *bt;
- int bank;
-
- /* set the io timings from the specifier */
-
- for (bank = 0; bank < MAX_BANKS; bank++) {
- bt = iot->bank[bank].io_2410;
- if (!bt)
- continue;
-
- __raw_writel(bt->bankcon, bank_reg(bank));
- }
-}
-
-/**
- * s3c2410_iotiming_get - Get the timing information from current registers.
- * @cfg: The frequency configuration
- * @timings: The IO timing information to fill out.
- *
- * Calculate the @timings timing information from the current frequency
- * information in @cfg, and the new frequency configuration
- * through all the IO banks, reading the state and then updating @iot
- * as necessary.
- *
- * This is used at the moment on initialisation to get the current
- * configuration so that boards do not have to carry their own setup
- * if the timings are correct on initialisation.
- */
-
-int s3c2410_iotiming_get(struct s3c_cpufreq_config *cfg,
- struct s3c_iotimings *timings)
-{
- struct s3c2410_iobank_timing *bt;
- unsigned long bankcon;
- unsigned long bwscon;
- int bank;
-
- bwscon = __raw_readl(S3C2410_BWSCON);
-
- /* look through all banks to see what is currently set. */
-
- for (bank = 0; bank < MAX_BANKS; bank++) {
- bankcon = __raw_readl(bank_reg(bank));
-
- if (!bank_is_io(bankcon))
- continue;
-
- s3c_freq_iodbg("%s: bank %d: con %08lx\n",
- __func__, bank, bankcon);
-
- bt = kzalloc(sizeof(*bt), GFP_KERNEL);
- if (!bt)
- return -ENOMEM;
-
- /* find out in nWait is enabled for bank. */
-
- if (bank != 0) {
- unsigned long tmp = S3C2410_BWSCON_GET(bwscon, bank);
- if (tmp & S3C2410_BWSCON_WS)
- bt->nwait_en = 1;
- }
-
- timings->bank[bank].io_2410 = bt;
- bt->bankcon = bankcon;
-
- s3c2410_iotiming_getbank(cfg, bt);
- }
-
- s3c2410_print_timing("get", timings);
- return 0;
-}